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Message-ID: <5670AD36.3080307@codeaurora.org>
Date: Tue, 15 Dec 2015 18:15:50 -0600
From: Timur Tabi <timur@...eaurora.org>
To: Gilad Avidov <gavidov@...eaurora.org>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-msm@...r.kernel.org
Cc: sdharia@...eaurora.org, shankerd@...eaurora.org,
gregkh@...uxfoundation.org, vikrams@...eaurora.org,
Christopher Covington <cov@...eaurora.org>
Subject: Re: [PATCH] net: emac: emac gigabit ethernet controller driver
Gilad Avidov wrote:
> Add support for ethernet controller HW on Qualcomm Technologies, Inc. SoC.
> This driver supports the following features:
> 1) Receive Side Scaling (RSS).
> 2) Checksum offload.
> 3) Runtime power management support.
> 4) Interrupt coalescing support.
> 5) SGMII phy.
> 6) SGMII direct connection without external phy.
>
> Based on a driver by Niranjana Vishwanathapura
> <nvishwan@...eaurora.org>.
>
> Changes since v1 (https://lkml.org/lkml/2015/12/7/1088)
You forgot to add "[v2]" to the subject line of this email.
> - replace hw bit fields to macros with bitwise operations.
> - change all iterators to unsized types (int)
> - some minor code flow improvements.
> - change return type to void for functions which return value is never
> used.
> - replace instance of xxxxl_relaxed() io followed by mb() with a
> readl()/writel().
>
> Signed-off-by: Gilad Avidov <gavidov@...eaurora.org>
> ---
> .../devicetree/bindings/net/qcom-emac.txt | 80 +
> drivers/net/ethernet/qualcomm/Kconfig | 7 +
> drivers/net/ethernet/qualcomm/Makefile | 2 +
> drivers/net/ethernet/qualcomm/emac/Makefile | 7 +
> drivers/net/ethernet/qualcomm/emac/emac-mac.c | 2224 ++++++++++++++++++++
> drivers/net/ethernet/qualcomm/emac/emac-mac.h | 287 +++
> drivers/net/ethernet/qualcomm/emac/emac-phy.c | 529 +++++
> drivers/net/ethernet/qualcomm/emac/emac-phy.h | 73 +
> drivers/net/ethernet/qualcomm/emac/emac-sgmii.c | 696 ++++++
> drivers/net/ethernet/qualcomm/emac/emac-sgmii.h | 30 +
> drivers/net/ethernet/qualcomm/emac/emac.c | 1322 ++++++++++++
> drivers/net/ethernet/qualcomm/emac/emac.h | 427 ++++
> 12 files changed, 5684 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/net/qcom-emac.txt
> create mode 100644 drivers/net/ethernet/qualcomm/emac/Makefile
> create mode 100644 drivers/net/ethernet/qualcomm/emac/emac-mac.c
> create mode 100644 drivers/net/ethernet/qualcomm/emac/emac-mac.h
> create mode 100644 drivers/net/ethernet/qualcomm/emac/emac-phy.c
> create mode 100644 drivers/net/ethernet/qualcomm/emac/emac-phy.h
> create mode 100644 drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
> create mode 100644 drivers/net/ethernet/qualcomm/emac/emac-sgmii.h
> create mode 100644 drivers/net/ethernet/qualcomm/emac/emac.c
> create mode 100644 drivers/net/ethernet/qualcomm/emac/emac.h
>
> diff --git a/Documentation/devicetree/bindings/net/qcom-emac.txt b/Documentation/devicetree/bindings/net/qcom-emac.txt
> new file mode 100644
> index 0000000..51c17c1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/qcom-emac.txt
> @@ -0,0 +1,80 @@
> +Qualcomm EMAC Gigabit Ethernet Controller
> +
> +Required properties:
> +- cell-index : EMAC controller instance number.
> +- compatible : Should be "qcom,emac".
> +- reg : Offset and length of the register regions for the device
> +- reg-names : Register region names referenced in 'reg' above.
> + Required register resource entries are:
> + "base" : EMAC controller base register block.
> + "csr" : EMAC wrapper register block.
> + Optional register resource entries are:
> + "ptp" : EMAC PTP (1588) register block.
> + Required if 'qcom,emac-tstamp-en' is present.
> + "sgmii" : EMAC SGMII PHY register block.
> +- interrupts : Interrupt numbers used by this controller
> +- interrupt-names : Interrupt resource names referenced in 'interrupts' above.
> + Required interrupt resource entries are:
> + "core0_irq" : EMAC core0 interrupt.
> + "sgmii_irq" : EMAC SGMII interrupt.
> + Optional interrupt resource entries are:
> + "core1_irq" : EMAC core1 interrupt.
> + "core2_irq" : EMAC core2 interrupt.
> + "core3_irq" : EMAC core3 interrupt.
> + "wol_irq" : EMAC Wake-On-LAN (WOL) interrupt. Required if WOL is used.
> +- qcom,emac-gpio-mdc : GPIO pin number of the MDC line of MDIO bus.
> +- qcom,emac-gpio-mdio : GPIO pin number of the MDIO line of MDIO bus.
> +- phy-addr : Specifies phy address on MDIO bus.
> + Required if the optional property "qcom,no-external-phy"
> + is not specified.
> +
> +Optional properties:
> +- qcom,emac-tstamp-en : Enables the PTP (1588) timestamping feature.
> + Include this only if PTP (1588) timestamping
> + feature is needed. If included, "ptp" register
> + base should be specified.
> +- mac-address : The 6-byte MAC address. If present, it is the
> + default MAC address.
> +- qcom,no-external-phy : Indicates there is no external PHY connected to
> + EMAC. Include this only if the EMAC is directly
> + connected to the peer end without EPHY.
> +- qcom,emac-ptp-grandmaster : Enable the PTP (1588) grandmaster mode.
> + Include this only if PTP (1588) is configured as
> + grandmaster.
> +- qcom,emac-ptp-frac-ns-adj : The vector table to adjust the fractional ns per
> + RTC clock cycle.
> + Include this only if there is accuracy loss of
> + fractional ns per RTC clock cycle. For individual
> + table entry, the first field indicates the RTC
> + reference clock rate. The second field indicates
> + the number of adjustment in 2 ^ -26 ns.
> +Example:
> + emac0: qcom,emac@...20000 {
> + cell-index = <0>;
> + compatible = "qcom,emac";
> + reg-names = "base", "csr", "ptp", "sgmii";
> + reg = <0xfeb20000 0x10000>,
> + <0xfeb36000 0x1000>,
> + <0xfeb3c000 0x4000>,
> + <0xfeb38000 0x400>;
> + #address-cells = <0>;
> + interrupt-parent = <&emac0>;
> + #interrupt-cells = <1>;
> + interrupts = <0 1 2 3 4 5>;
> + interrupt-map-mask = <0xffffffff>;
> + interrupt-map = <0 &intc 0 76 0
> + 1 &intc 0 77 0
> + 2 &intc 0 78 0
> + 3 &intc 0 79 0
> + 4 &intc 0 80 0>;
> + interrupt-names = "core0_irq",
> + "core1_irq",
> + "core2_irq",
> + "core3_irq",
> + "sgmii_irq";
> + qcom,emac-gpio-mdc = <&msmgpio 123 0>;
> + qcom,emac-gpio-mdio = <&msmgpio 124 0>;
> + qcom,emac-tstamp-en;
> + qcom,emac-ptp-frac-ns-adj = <125000000 1>;
> + phy-addr = <0>;
> + };
> diff --git a/drivers/net/ethernet/qualcomm/Kconfig b/drivers/net/ethernet/qualcomm/Kconfig
> index a76e380..ae9442d 100644
> --- a/drivers/net/ethernet/qualcomm/Kconfig
> +++ b/drivers/net/ethernet/qualcomm/Kconfig
> @@ -24,4 +24,11 @@ config QCA7000
> To compile this driver as a module, choose M here. The module
> will be called qcaspi.
>
> +config QCOM_EMAC
> + tristate "MSM EMAC Gigabit Ethernet support"
> + default n
> + select CRC32
> + ---help---
> + This driver supports the Qualcomm EMAC Gigabit Ethernet controller.
Needs more text here.
> +
> endif # NET_VENDOR_QUALCOMM
> diff --git a/drivers/net/ethernet/qualcomm/Makefile b/drivers/net/ethernet/qualcomm/Makefile
> index 9da2d75..b14686e 100644
> --- a/drivers/net/ethernet/qualcomm/Makefile
> +++ b/drivers/net/ethernet/qualcomm/Makefile
> @@ -4,3 +4,5 @@
>
> obj-$(CONFIG_QCA7000) += qcaspi.o
> qcaspi-objs := qca_spi.o qca_framing.o qca_7k.o qca_debug.o
> +
> +obj-$(CONFIG_QCOM_EMAC) += emac/
> \ No newline at end of file
> diff --git a/drivers/net/ethernet/qualcomm/emac/Makefile b/drivers/net/ethernet/qualcomm/emac/Makefile
> new file mode 100644
> index 0000000..01ee144
> --- /dev/null
> +++ b/drivers/net/ethernet/qualcomm/emac/Makefile
> @@ -0,0 +1,7 @@
> +#
> +# Makefile for the Qualcomm Technologies, Inc. EMAC Gigabit Ethernet driver
> +#
> +
> +obj-$(CONFIG_QCOM_EMAC) += qcom-emac.o
> +
> +qcom-emac-objs := emac.o emac-mac.o emac-phy.o emac-sgmii.o
> diff --git a/drivers/net/ethernet/qualcomm/emac/emac-mac.c b/drivers/net/ethernet/qualcomm/emac/emac-mac.c
> new file mode 100644
> index 0000000..9cb1275
> --- /dev/null
> +++ b/drivers/net/ethernet/qualcomm/emac/emac-mac.c
> @@ -0,0 +1,2224 @@
> +/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +/* Qualcomm Technologies, Inc. EMAC Ethernet Controller MAC layer support
> + */
> +
> +#include <linux/tcp.h>
> +#include <linux/ip.h>
> +#include <linux/ipv6.h>
> +#include <linux/crc32.h>
> +#include <linux/if_vlan.h>
> +#include <linux/jiffies.h>
> +#include <linux/phy.h>
> +#include <linux/of.h>
> +#include <linux/gpio.h>
> +#include <linux/pm_runtime.h>
> +#include "emac.h"
> +#include "emac-mac.h"
> +
> +/* EMAC base register offsets */
> +#define EMAC_MAC_CTRL 0x001480
> +#define EMAC_WOL_CTRL0 0x0014a0
> +#define EMAC_RSS_KEY0 0x0014b0
> +#define EMAC_H1TPD_BASE_ADDR_LO 0x0014e0
> +#define EMAC_H2TPD_BASE_ADDR_LO 0x0014e4
> +#define EMAC_H3TPD_BASE_ADDR_LO 0x0014e8
> +#define EMAC_INTER_SRAM_PART9 0x001534
> +#define EMAC_DESC_CTRL_0 0x001540
> +#define EMAC_DESC_CTRL_1 0x001544
> +#define EMAC_DESC_CTRL_2 0x001550
> +#define EMAC_DESC_CTRL_10 0x001554
> +#define EMAC_DESC_CTRL_12 0x001558
> +#define EMAC_DESC_CTRL_13 0x00155c
> +#define EMAC_DESC_CTRL_3 0x001560
> +#define EMAC_DESC_CTRL_4 0x001564
> +#define EMAC_DESC_CTRL_5 0x001568
> +#define EMAC_DESC_CTRL_14 0x00156c
> +#define EMAC_DESC_CTRL_15 0x001570
> +#define EMAC_DESC_CTRL_16 0x001574
> +#define EMAC_DESC_CTRL_6 0x001578
> +#define EMAC_DESC_CTRL_8 0x001580
> +#define EMAC_DESC_CTRL_9 0x001584
> +#define EMAC_DESC_CTRL_11 0x001588
> +#define EMAC_TXQ_CTRL_0 0x001590
> +#define EMAC_TXQ_CTRL_1 0x001594
> +#define EMAC_TXQ_CTRL_2 0x001598
> +#define EMAC_RXQ_CTRL_0 0x0015a0
> +#define EMAC_RXQ_CTRL_1 0x0015a4
> +#define EMAC_RXQ_CTRL_2 0x0015a8
> +#define EMAC_RXQ_CTRL_3 0x0015ac
> +#define EMAC_BASE_CPU_NUMBER 0x0015b8
> +#define EMAC_DMA_CTRL 0x0015c0
> +#define EMAC_MAILBOX_0 0x0015e0
> +#define EMAC_MAILBOX_5 0x0015e4
> +#define EMAC_MAILBOX_6 0x0015e8
> +#define EMAC_MAILBOX_13 0x0015ec
> +#define EMAC_MAILBOX_2 0x0015f4
> +#define EMAC_MAILBOX_3 0x0015f8
> +#define EMAC_MAILBOX_11 0x00160c
> +#define EMAC_AXI_MAST_CTRL 0x001610
> +#define EMAC_MAILBOX_12 0x001614
> +#define EMAC_MAILBOX_9 0x001618
> +#define EMAC_MAILBOX_10 0x00161c
> +#define EMAC_ATHR_HEADER_CTRL 0x001620
> +#define EMAC_CLK_GATE_CTRL 0x001814
> +#define EMAC_MISC_CTRL 0x001990
> +#define EMAC_MAILBOX_7 0x0019e0
> +#define EMAC_MAILBOX_8 0x0019e4
> +#define EMAC_MAILBOX_15 0x001bd4
> +#define EMAC_MAILBOX_16 0x001bd8
> +
> +/* EMAC_MAC_CTRL */
> +#define SINGLE_PAUSE_MODE 0x10000000
> +#define DEBUG_MODE 0x8000000
> +#define BROAD_EN 0x4000000
> +#define MULTI_ALL 0x2000000
> +#define RX_CHKSUM_EN 0x1000000
> +#define HUGE 0x800000
> +#define SPEED_BMSK 0x300000
> +#define SPEED_SHFT 20
> +#define SIMR 0x80000
> +#define TPAUSE 0x10000
> +#define PROM_MODE 0x8000
> +#define VLAN_STRIP 0x4000
> +#define PRLEN_BMSK 0x3c00
> +#define PRLEN_SHFT 10
> +#define HUGEN 0x200
> +#define FLCHK 0x100
> +#define PCRCE 0x80
> +#define CRCE 0x40
> +#define FULLD 0x20
> +#define MAC_LP_EN 0x10
> +#define RXFC 0x8
> +#define TXFC 0x4
> +#define RXEN 0x2
> +#define TXEN 0x1
> +
> +/* EMAC_WOL_CTRL0 */
> +#define LK_CHG_PME 0x20
> +#define LK_CHG_EN 0x10
> +#define MG_FRAME_PME 0x8
> +#define MG_FRAME_EN 0x4
> +#define WK_FRAME_EN 0x1
> +
> +/* EMAC_DESC_CTRL_3 */
> +#define RFD_RING_SIZE_BMSK 0xfff
> +
> +/* EMAC_DESC_CTRL_4 */
> +#define RX_BUFFER_SIZE_BMSK 0xffff
> +
> +/* EMAC_DESC_CTRL_6 */
> +#define RRD_RING_SIZE_BMSK 0xfff
> +
> +/* EMAC_DESC_CTRL_9 */
> +#define TPD_RING_SIZE_BMSK 0xffff
> +
> +/* EMAC_TXQ_CTRL_0 */
> +#define NUM_TXF_BURST_PREF_BMSK 0xffff0000
> +#define NUM_TXF_BURST_PREF_SHFT 16
> +#define LS_8023_SP 0x80
> +#define TXQ_MODE 0x40
> +#define TXQ_EN 0x20
> +#define IP_OP_SP 0x10
> +#define NUM_TPD_BURST_PREF_BMSK 0xf
> +#define NUM_TPD_BURST_PREF_SHFT 0
> +
> +/* EMAC_TXQ_CTRL_1 */
> +#define JUMBO_TASK_OFFLOAD_THRESHOLD_BMSK 0x7ff
> +
> +/* EMAC_TXQ_CTRL_2 */
> +#define TXF_HWM_BMSK 0xfff0000
> +#define TXF_LWM_BMSK 0xfff
> +
> +/* EMAC_RXQ_CTRL_0 */
> +#define RXQ_EN 0x80000000
> +#define CUT_THRU_EN 0x40000000
> +#define RSS_HASH_EN 0x20000000
> +#define NUM_RFD_BURST_PREF_BMSK 0x3f00000
> +#define NUM_RFD_BURST_PREF_SHFT 20
> +#define IDT_TABLE_SIZE_BMSK 0x1ff00
> +#define IDT_TABLE_SIZE_SHFT 8
> +#define SP_IPV6 0x80
> +
> +/* EMAC_RXQ_CTRL_1 */
> +#define JUMBO_1KAH_BMSK 0xf000
> +#define JUMBO_1KAH_SHFT 12
> +#define RFD_PREF_LOW_TH 0x10
> +#define RFD_PREF_LOW_THRESHOLD_BMSK 0xfc0
> +#define RFD_PREF_LOW_THRESHOLD_SHFT 6
> +#define RFD_PREF_UP_TH 0x10
> +#define RFD_PREF_UP_THRESHOLD_BMSK 0x3f
> +#define RFD_PREF_UP_THRESHOLD_SHFT 0
> +
> +/* EMAC_RXQ_CTRL_2 */
> +#define RXF_DOF_THRESFHOLD 0x1a0
> +#define RXF_DOF_THRESHOLD_BMSK 0xfff0000
> +#define RXF_DOF_THRESHOLD_SHFT 16
> +#define RXF_UOF_THRESFHOLD 0xbe
> +#define RXF_UOF_THRESHOLD_BMSK 0xfff
> +#define RXF_UOF_THRESHOLD_SHFT 0
> +
> +/* EMAC_RXQ_CTRL_3 */
> +#define RXD_TIMER_BMSK 0xffff0000
> +#define RXD_THRESHOLD_BMSK 0xfff
> +#define RXD_THRESHOLD_SHFT 0
> +
> +/* EMAC_DMA_CTRL */
> +#define DMAW_DLY_CNT_BMSK 0xf0000
> +#define DMAW_DLY_CNT_SHFT 16
> +#define DMAR_DLY_CNT_BMSK 0xf800
> +#define DMAR_DLY_CNT_SHFT 11
> +#define DMAR_REQ_PRI 0x400
> +#define REGWRBLEN_BMSK 0x380
> +#define REGWRBLEN_SHFT 7
> +#define REGRDBLEN_BMSK 0x70
> +#define REGRDBLEN_SHFT 4
> +#define OUT_ORDER_MODE 0x4
> +#define ENH_ORDER_MODE 0x2
> +#define IN_ORDER_MODE 0x1
> +
> +/* EMAC_MAILBOX_13 */
> +#define RFD3_PROC_IDX_BMSK 0xfff0000
> +#define RFD3_PROC_IDX_SHFT 16
> +#define RFD3_PROD_IDX_BMSK 0xfff
> +#define RFD3_PROD_IDX_SHFT 0
> +
> +/* EMAC_MAILBOX_2 */
> +#define NTPD_CONS_IDX_BMSK 0xffff0000
> +#define NTPD_CONS_IDX_SHFT 16
> +
> +/* EMAC_MAILBOX_3 */
> +#define RFD0_CONS_IDX_BMSK 0xfff
> +#define RFD0_CONS_IDX_SHFT 0
> +
> +/* EMAC_MAILBOX_11 */
> +#define H3TPD_PROD_IDX_BMSK 0xffff0000
> +#define H3TPD_PROD_IDX_SHFT 16
> +
> +/* EMAC_AXI_MAST_CTRL */
> +#define DATA_BYTE_SWAP 0x8
> +#define MAX_BOUND 0x2
> +#define MAX_BTYPE 0x1
> +
> +/* EMAC_MAILBOX_12 */
> +#define H3TPD_CONS_IDX_BMSK 0xffff0000
> +#define H3TPD_CONS_IDX_SHFT 16
> +
> +/* EMAC_MAILBOX_9 */
> +#define H2TPD_PROD_IDX_BMSK 0xffff
> +#define H2TPD_PROD_IDX_SHFT 0
> +
> +/* EMAC_MAILBOX_10 */
> +#define H1TPD_CONS_IDX_BMSK 0xffff0000
> +#define H1TPD_CONS_IDX_SHFT 16
> +#define H2TPD_CONS_IDX_BMSK 0xffff
> +#define H2TPD_CONS_IDX_SHFT 0
> +
> +/* EMAC_ATHR_HEADER_CTRL */
> +#define HEADER_CNT_EN 0x2
> +#define HEADER_ENABLE 0x1
> +
> +/* EMAC_MAILBOX_0 */
> +#define RFD0_PROC_IDX_BMSK 0xfff0000
> +#define RFD0_PROC_IDX_SHFT 16
> +#define RFD0_PROD_IDX_BMSK 0xfff
> +#define RFD0_PROD_IDX_SHFT 0
> +
> +/* EMAC_MAILBOX_5 */
> +#define RFD1_PROC_IDX_BMSK 0xfff0000
> +#define RFD1_PROC_IDX_SHFT 16
> +#define RFD1_PROD_IDX_BMSK 0xfff
> +#define RFD1_PROD_IDX_SHFT 0
> +
> +/* EMAC_MISC_CTRL */
> +#define RX_UNCPL_INT_EN 0x1
> +
> +/* EMAC_MAILBOX_7 */
> +#define RFD2_CONS_IDX_BMSK 0xfff0000
> +#define RFD2_CONS_IDX_SHFT 16
> +#define RFD1_CONS_IDX_BMSK 0xfff
> +#define RFD1_CONS_IDX_SHFT 0
> +
> +/* EMAC_MAILBOX_8 */
> +#define RFD3_CONS_IDX_BMSK 0xfff
> +#define RFD3_CONS_IDX_SHFT 0
> +
> +/* EMAC_MAILBOX_15 */
> +#define NTPD_PROD_IDX_BMSK 0xffff
> +#define NTPD_PROD_IDX_SHFT 0
> +
> +/* EMAC_MAILBOX_16 */
> +#define H1TPD_PROD_IDX_BMSK 0xffff
> +#define H1TPD_PROD_IDX_SHFT 0
> +
> +#define RXQ0_RSS_HSTYP_IPV6_TCP_EN 0x20
> +#define RXQ0_RSS_HSTYP_IPV6_EN 0x10
> +#define RXQ0_RSS_HSTYP_IPV4_TCP_EN 0x8
> +#define RXQ0_RSS_HSTYP_IPV4_EN 0x4
> +
> +/* DMA address */
> +#define DMA_ADDR_HI_MASK 0xffffffff00000000ULL
> +#define DMA_ADDR_LO_MASK 0x00000000ffffffffULL
> +
> +#define EMAC_DMA_ADDR_HI(_addr) \
> + ((u32)(((u64)(_addr) & DMA_ADDR_HI_MASK) >> 32))
> +#define EMAC_DMA_ADDR_LO(_addr) \
> + ((u32)((u64)(_addr) & DMA_ADDR_LO_MASK))
> +
> +/* EMAC_EMAC_WRAPPER_TX_TS_INX */
> +#define EMAC_WRAPPER_TX_TS_EMPTY 0x80000000
> +#define EMAC_WRAPPER_TX_TS_INX_BMSK 0xffff
> +
> +struct emac_skb_cb {
> + u32 tpd_idx;
> + unsigned long jiffies;
> +};
> +
> +struct emac_tx_ts_cb {
> + u32 sec;
> + u32 ns;
> +};
> +
> +#define EMAC_SKB_CB(skb) ((struct emac_skb_cb *)(skb)->cb)
> +#define EMAC_TX_TS_CB(skb) ((struct emac_tx_ts_cb *)(skb)->cb)
> +#define EMAC_RSS_IDT_SIZE 256
> +#define JUMBO_1KAH 0x4
> +#define RXD_TH 0x100
> +#define EMAC_TPD_LAST_FRAGMENT 0x80000000
> +#define EMAC_TPD_TSTAMP_SAVE 0x80000000
> +
> +/* EMAC Errors in emac_rrd.word[3] */
> +#define EMAC_RRD_L4F BIT(14)
> +#define EMAC_RRD_IPF BIT(15)
> +#define EMAC_RRD_CRC BIT(21)
> +#define EMAC_RRD_FAE BIT(22)
> +#define EMAC_RRD_TRN BIT(23)
> +#define EMAC_RRD_RNT BIT(24)
> +#define EMAC_RRD_INC BIT(25)
> +#define EMAC_RRD_FOV BIT(29)
> +#define EMAC_RRD_LEN BIT(30)
> +
> +/* Error bits that will result in a received frame being discarded */
> +#define EMAC_RRD_ERROR (EMAC_RRD_IPF | EMAC_RRD_CRC | EMAC_RRD_FAE | \
> + EMAC_RRD_TRN | EMAC_RRD_RNT | EMAC_RRD_INC | \
> + EMAC_RRD_FOV | EMAC_RRD_LEN)
> +#define EMAC_RRD_STATS_DW_IDX 3
> +
> +#define EMAC_RRD(RXQ, SIZE, IDX) ((RXQ)->rrd.v_addr + (SIZE * (IDX)))
> +#define EMAC_RFD(RXQ, SIZE, IDX) ((RXQ)->rfd.v_addr + (SIZE * (IDX)))
> +#define EMAC_TPD(TXQ, SIZE, IDX) ((TXQ)->tpd.v_addr + (SIZE * (IDX)))
> +
> +#define GET_RFD_BUFFER(RXQ, IDX) (&((RXQ)->rfd.rfbuff[(IDX)]))
> +#define GET_TPD_BUFFER(RTQ, IDX) (&((RTQ)->tpd.tpbuff[(IDX)]))
> +
> +#define EMAC_TX_POLL_HWTXTSTAMP_THRESHOLD 8
> +
> +#define ISR_RX_PKT (\
> + RX_PKT_INT0 |\
> + RX_PKT_INT1 |\
> + RX_PKT_INT2 |\
> + RX_PKT_INT3)
> +
> +static void emac_mac_irq_enable(struct emac_adapter *adpt)
> +{
> + int i;
> +
> + for (i = 0; i < EMAC_NUM_CORE_IRQ; i++) {
> + struct emac_irq *irq = &adpt->irq[i];
> + const struct emac_irq_config *irq_cfg = &emac_irq_cfg_tbl[i];
> +
> + writel_relaxed(~DIS_INT, adpt->base + irq_cfg->status_reg);
> + writel_relaxed(irq->mask, adpt->base + irq_cfg->mask_reg);
> + }
> +
> + wmb(); /* ensure that irq and ptp setting are flushed to HW */
> +}
> +
> +static void emac_mac_irq_disable(struct emac_adapter *adpt)
> +{
> + int i;
> +
> + for (i = 0; i < EMAC_NUM_CORE_IRQ; i++) {
> + const struct emac_irq_config *irq_cfg = &emac_irq_cfg_tbl[i];
> +
> + writel_relaxed(DIS_INT, adpt->base + irq_cfg->status_reg);
> + writel_relaxed(0, adpt->base + irq_cfg->mask_reg);
> + }
> + wmb(); /* ensure that irq clearings are flushed to HW */
> +
> + for (i = 0; i < EMAC_NUM_CORE_IRQ; i++)
> + if (adpt->irq[i].irq)
> + synchronize_irq(adpt->irq[i].irq);
> +}
> +
> +void emac_mac_multicast_addr_set(struct emac_adapter *adpt, u8 *addr)
> +{
> + u32 crc32, bit, reg, mta;
> +
> + /* Calculate the CRC of the MAC address */
> + crc32 = ether_crc(ETH_ALEN, addr);
> +
> + /* The HASH Table is an array of 2 32-bit registers. It is
> + * treated like an array of 64 bits (BitArray[hash_value]).
> + * Use the upper 6 bits of the above CRC as the hash value.
> + */
> + reg = (crc32 >> 31) & 0x1;
> + bit = (crc32 >> 26) & 0x1F;
> +
> + mta = readl_relaxed(adpt->base + EMAC_HASH_TAB_REG0 + (reg << 2));
> + mta |= (0x1 << bit);
> + writel_relaxed(mta, adpt->base + EMAC_HASH_TAB_REG0 + (reg << 2));
> + wmb(); /* ensure that the mac address is flushed to HW */
> +}
> +
> +void emac_mac_multicast_addr_clear(struct emac_adapter *adpt)
> +{
> + writel_relaxed(0, adpt->base + EMAC_HASH_TAB_REG0);
> + writel_relaxed(0, adpt->base + EMAC_HASH_TAB_REG1);
> + wmb(); /* ensure that clearing the mac address is flushed to HW */
> +}
As Arnd said, all of these wmb() are bogus. They don't guarantee any
actual flushing to hardware. And the writel_relaxed() should be changed
to writel() in almost every situation.
> +
> +/* definitions for RSS */
> +#define EMAC_RSS_KEY(_i, _type) \
> + (EMAC_RSS_KEY0 + ((_i) * sizeof(_type)))
> +#define EMAC_RSS_TBL(_i, _type) \
> + (EMAC_IDT_TABLE0 + ((_i) * sizeof(_type)))
> +
> +/* RSS */
> +static void emac_mac_rss_config(struct emac_adapter *adpt)
> +{
> + int key_len_by_u32 = ARRAY_SIZE(adpt->rss_key);
> + int idt_len_by_u32 = ARRAY_SIZE(adpt->rss_idt);
> + u32 rxq0;
> + int i;
> +
> + /* Fill out hash function keys */
> + for (i = 0; i < key_len_by_u32; i++) {
> + u32 key, idx_base;
> +
> + idx_base = (key_len_by_u32 - i) * 4;
> + key = ((adpt->rss_key[idx_base - 1]) |
> + (adpt->rss_key[idx_base - 2] << 8) |
> + (adpt->rss_key[idx_base - 3] << 16) |
> + (adpt->rss_key[idx_base - 4] << 24));
> + writel_relaxed(key, adpt->base + EMAC_RSS_KEY(i, u32));
> + }
> +
> + /* Fill out redirection table */
> + for (i = 0; i < idt_len_by_u32; i++)
> + writel_relaxed(adpt->rss_idt[i],
> + adpt->base + EMAC_RSS_TBL(i, u32));
> +
> + writel_relaxed(adpt->rss_base_cpu, adpt->base + EMAC_BASE_CPU_NUMBER);
> +
> + rxq0 = readl_relaxed(adpt->base + EMAC_RXQ_CTRL_0);
> + if (adpt->rss_hstype & EMAC_RSS_HSTYP_IPV4_EN)
> + rxq0 |= RXQ0_RSS_HSTYP_IPV4_EN;
> + else
> + rxq0 &= ~RXQ0_RSS_HSTYP_IPV4_EN;
> +
> + if (adpt->rss_hstype & EMAC_RSS_HSTYP_TCP4_EN)
> + rxq0 |= RXQ0_RSS_HSTYP_IPV4_TCP_EN;
> + else
> + rxq0 &= ~RXQ0_RSS_HSTYP_IPV4_TCP_EN;
> +
> + if (adpt->rss_hstype & EMAC_RSS_HSTYP_IPV6_EN)
> + rxq0 |= RXQ0_RSS_HSTYP_IPV6_EN;
> + else
> + rxq0 &= ~RXQ0_RSS_HSTYP_IPV6_EN;
> +
> + if (adpt->rss_hstype & EMAC_RSS_HSTYP_TCP6_EN)
> + rxq0 |= RXQ0_RSS_HSTYP_IPV6_TCP_EN;
> + else
> + rxq0 &= ~RXQ0_RSS_HSTYP_IPV6_TCP_EN;
> +
> + rxq0 |= ((adpt->rss_idt_size << IDT_TABLE_SIZE_SHFT) &
> + IDT_TABLE_SIZE_BMSK);
> + rxq0 |= RSS_HASH_EN;
> +
> + wmb(); /* ensure all parameters are written before enabling RSS */
> +
> + writel(rxq0, adpt->base + EMAC_RXQ_CTRL_0);
> +}
> +
> +/* Config MAC modes */
> +void emac_mac_mode_config(struct emac_adapter *adpt)
> +{
> + u32 mac;
> +
> + mac = readl_relaxed(adpt->base + EMAC_MAC_CTRL);
> +
> + if (test_bit(EMAC_STATUS_VLANSTRIP_EN, &adpt->status))
> + mac |= VLAN_STRIP;
> + else
> + mac &= ~VLAN_STRIP;
> +
> + if (test_bit(EMAC_STATUS_PROMISC_EN, &adpt->status))
> + mac |= PROM_MODE;
> + else
> + mac &= ~PROM_MODE;
> +
> + if (test_bit(EMAC_STATUS_MULTIALL_EN, &adpt->status))
> + mac |= MULTI_ALL;
> + else
> + mac &= ~MULTI_ALL;
> +
> + if (test_bit(EMAC_STATUS_LOOPBACK_EN, &adpt->status))
> + mac |= MAC_LP_EN;
> + else
> + mac &= ~MAC_LP_EN;
> +
> + writel_relaxed(mac, adpt->base + EMAC_MAC_CTRL);
> + wmb(); /* ensure MAC setting is flushed to HW */
> +}
> +
> +/* Wake On LAN (WOL) */
> +void emac_mac_wol_config(struct emac_adapter *adpt, u32 wufc)
> +{
> + u32 wol = 0;
> +
> + /* turn on magic packet event */
> + if (wufc & EMAC_WOL_MAGIC)
> + wol |= MG_FRAME_EN | MG_FRAME_PME | WK_FRAME_EN;
> +
> + /* turn on link up event */
> + if (wufc & EMAC_WOL_PHY)
> + wol |= LK_CHG_EN | LK_CHG_PME;
> +
> + writel_relaxed(wol, adpt->base + EMAC_WOL_CTRL0);
> + wmb(); /* ensure that WOL setting is flushed to HW */
> +}
> +
> +/* Power Management */
> +void emac_mac_pm(struct emac_adapter *adpt, u32 speed, bool wol_en, bool rx_en)
> +{
> + u32 dma_mas, mac;
> +
> + dma_mas = readl_relaxed(adpt->base + EMAC_DMA_MAS_CTRL);
> + dma_mas &= ~LPW_CLK_SEL;
> + dma_mas |= LPW_STATE;
> +
> + mac = readl_relaxed(adpt->base + EMAC_MAC_CTRL);
> + mac &= ~(FULLD | RXEN | TXEN);
> + mac = (mac & ~SPEED_BMSK) |
> + (((u32)emac_mac_speed_10_100 << SPEED_SHFT) & SPEED_BMSK);
> +
> + if (wol_en) {
> + if (rx_en)
> + mac |= RXEN | BROAD_EN;
> +
> + /* If WOL is enabled, set link speed/duplex for mac */
> + if (speed == EMAC_LINK_SPEED_1GB_FULL)
> + mac = (mac & ~SPEED_BMSK) |
> + (((u32)emac_mac_speed_1000 << SPEED_SHFT) &
> + SPEED_BMSK);
> +
> + if (speed == EMAC_LINK_SPEED_10_FULL ||
> + speed == EMAC_LINK_SPEED_100_FULL ||
> + speed == EMAC_LINK_SPEED_1GB_FULL)
> + mac |= FULLD;
> + } else {
> + /* select lower clock speed if WOL is disabled */
> + dma_mas |= LPW_CLK_SEL;
> + }
> +
> + writel_relaxed(dma_mas, adpt->base + EMAC_DMA_MAS_CTRL);
> + writel_relaxed(mac, adpt->base + EMAC_MAC_CTRL);
> + wmb(); /* ensure that power setting is flushed to HW */
> +}
> +
> +/* Config descriptor rings */
> +static void emac_mac_dma_rings_config(struct emac_adapter *adpt)
> +{
> + static const unsigned int tpd_q_offset[] = {
> + EMAC_DESC_CTRL_8, EMAC_H1TPD_BASE_ADDR_LO,
> + EMAC_H2TPD_BASE_ADDR_LO, EMAC_H3TPD_BASE_ADDR_LO};
> + static const unsigned int rfd_q_offset[] = {
> + EMAC_DESC_CTRL_2, EMAC_DESC_CTRL_10,
> + EMAC_DESC_CTRL_12, EMAC_DESC_CTRL_13};
> + static const unsigned int rrd_q_offset[] = {
> + EMAC_DESC_CTRL_5, EMAC_DESC_CTRL_14,
> + EMAC_DESC_CTRL_15, EMAC_DESC_CTRL_16};
> + int i;
> +
> + if (adpt->timestamp_en)
> + emac_reg_update32(adpt->csr + EMAC_EMAC_WRAPPER_CSR1,
> + 0, ENABLE_RRD_TIMESTAMP);
> +
> + /* TPD (Transmit Packet Descriptor) */
> + writel_relaxed(EMAC_DMA_ADDR_HI(adpt->tx_q[0].tpd.p_addr),
> + adpt->base + EMAC_DESC_CTRL_1);
> +
> + for (i = 0; i < adpt->tx_q_cnt; ++i)
> + writel_relaxed(EMAC_DMA_ADDR_LO(adpt->tx_q[i].tpd.p_addr),
> + adpt->base + tpd_q_offset[i]);
> +
> + writel_relaxed(adpt->tx_q[0].tpd.count & TPD_RING_SIZE_BMSK,
> + adpt->base + EMAC_DESC_CTRL_9);
> +
> + /* RFD (Receive Free Descriptor) & RRD (Receive Return Descriptor) */
> + writel_relaxed(EMAC_DMA_ADDR_HI(adpt->rx_q[0].rfd.p_addr),
> + adpt->base + EMAC_DESC_CTRL_0);
> +
> + for (i = 0; i < adpt->rx_q_cnt; ++i) {
> + writel_relaxed(EMAC_DMA_ADDR_LO(adpt->rx_q[i].rfd.p_addr),
> + adpt->base + rfd_q_offset[i]);
> + writel_relaxed(EMAC_DMA_ADDR_LO(adpt->rx_q[i].rrd.p_addr),
> + adpt->base + rrd_q_offset[i]);
> + }
> +
> + writel_relaxed(adpt->rx_q[0].rfd.count & RFD_RING_SIZE_BMSK,
> + adpt->base + EMAC_DESC_CTRL_3);
> + writel_relaxed(adpt->rx_q[0].rrd.count & RRD_RING_SIZE_BMSK,
> + adpt->base + EMAC_DESC_CTRL_6);
> +
> + writel_relaxed(adpt->rxbuf_size & RX_BUFFER_SIZE_BMSK,
> + adpt->base + EMAC_DESC_CTRL_4);
> +
> + writel_relaxed(0, adpt->base + EMAC_DESC_CTRL_11);
> +
> + wmb(); /* ensure all parameters are written before we enable them */
> +
> + /* Load all of the base addresses above and ensure that triggering HW to
> + * read ring pointers is flushed
> + */
> + writel(1, adpt->base + EMAC_INTER_SRAM_PART9);
> +}
> +
> +/* Config transmit parameters */
> +static void emac_mac_tx_config(struct emac_adapter *adpt)
> +{
> + u32 val;
> +
> + writel_relaxed((EMAC_MAX_TX_OFFLOAD_THRESH >> 3) &
> + JUMBO_TASK_OFFLOAD_THRESHOLD_BMSK,
> + adpt->base + EMAC_TXQ_CTRL_1);
> +
> + val = (adpt->tpd_burst << NUM_TPD_BURST_PREF_SHFT) &
> + NUM_TPD_BURST_PREF_BMSK;
> +
> + val |= (TXQ_MODE | LS_8023_SP);
> + val |= (0x0100 << NUM_TXF_BURST_PREF_SHFT) &
> + NUM_TXF_BURST_PREF_BMSK;
> +
> + writel_relaxed(val, adpt->base + EMAC_TXQ_CTRL_0);
> + emac_reg_update32(adpt->base + EMAC_TXQ_CTRL_2,
> + (TXF_HWM_BMSK | TXF_LWM_BMSK), 0);
> + wmb(); /* ensure that Tx control settings are flushed to HW */
> +}
> +
> +/* Config receive parameters */
> +static void emac_mac_rx_config(struct emac_adapter *adpt)
> +{
> + u32 val;
> +
> + val = ((adpt->rfd_burst << NUM_RFD_BURST_PREF_SHFT) &
> + NUM_RFD_BURST_PREF_BMSK);
> + val |= (SP_IPV6 | CUT_THRU_EN);
> +
> + writel_relaxed(val, adpt->base + EMAC_RXQ_CTRL_0);
> +
> + val = readl_relaxed(adpt->base + EMAC_RXQ_CTRL_1);
> + val &= ~(JUMBO_1KAH_BMSK | RFD_PREF_LOW_THRESHOLD_BMSK |
> + RFD_PREF_UP_THRESHOLD_BMSK);
> + val |= (JUMBO_1KAH << JUMBO_1KAH_SHFT) |
> + (RFD_PREF_LOW_TH << RFD_PREF_LOW_THRESHOLD_SHFT) |
> + (RFD_PREF_UP_TH << RFD_PREF_UP_THRESHOLD_SHFT);
> + writel_relaxed(val, adpt->base + EMAC_RXQ_CTRL_1);
> +
> + val = readl_relaxed(adpt->base + EMAC_RXQ_CTRL_2);
> + val &= ~(RXF_DOF_THRESHOLD_BMSK | RXF_UOF_THRESHOLD_BMSK);
> + val |= (RXF_DOF_THRESFHOLD << RXF_DOF_THRESHOLD_SHFT) |
> + (RXF_UOF_THRESFHOLD << RXF_UOF_THRESHOLD_SHFT);
> + writel_relaxed(val, adpt->base + EMAC_RXQ_CTRL_2);
> +
> + val = readl_relaxed(adpt->base + EMAC_RXQ_CTRL_3);
> + val &= ~(RXD_TIMER_BMSK | RXD_THRESHOLD_BMSK);
> + val |= RXD_TH << RXD_THRESHOLD_SHFT;
> + writel_relaxed(val, adpt->base + EMAC_RXQ_CTRL_3);
Can you use emac_reg_update32() here?
> + wmb(); /* ensure that Rx control settings are flushed to HW */
> +}
> +
> +/* Config dma */
> +static void emac_mac_dma_config(struct emac_adapter *adpt)
> +{
> + u32 dma_ctrl;
> +
> + dma_ctrl = DMAR_REQ_PRI;
> +
> + switch (adpt->dma_order) {
> + case emac_dma_ord_in:
> + dma_ctrl |= IN_ORDER_MODE;
> + break;
> + case emac_dma_ord_enh:
> + dma_ctrl |= ENH_ORDER_MODE;
> + break;
> + case emac_dma_ord_out:
> + dma_ctrl |= OUT_ORDER_MODE;
> + break;
> + default:
> + break;
> + }
> +
> + dma_ctrl |= (((u32)adpt->dmar_block) << REGRDBLEN_SHFT) &
> + REGRDBLEN_BMSK;
> + dma_ctrl |= (((u32)adpt->dmaw_block) << REGWRBLEN_SHFT) &
> + REGWRBLEN_BMSK;
> + dma_ctrl |= (((u32)adpt->dmar_dly_cnt) << DMAR_DLY_CNT_SHFT) &
> + DMAR_DLY_CNT_BMSK;
> + dma_ctrl |= (((u32)adpt->dmaw_dly_cnt) << DMAW_DLY_CNT_SHFT) &
> + DMAW_DLY_CNT_BMSK;
> +
> + /* config DMA and ensure that configuration is flushed to HW */
> + writel(dma_ctrl, adpt->base + EMAC_DMA_CTRL);
> +}
> +
> +void emac_mac_config(struct emac_adapter *adpt)
> +{
> + u32 val;
> +
> + emac_mac_addr_clear(adpt, adpt->mac_addr);
> +
> + emac_mac_dma_rings_config(adpt);
> +
> + writel_relaxed(adpt->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN,
> + adpt->base + EMAC_MAX_FRAM_LEN_CTRL);
> +
> + emac_mac_tx_config(adpt);
> + emac_mac_rx_config(adpt);
> + emac_mac_dma_config(adpt);
> +
> + val = readl_relaxed(adpt->base + EMAC_AXI_MAST_CTRL);
> + val &= ~(DATA_BYTE_SWAP | MAX_BOUND);
> + val |= MAX_BTYPE;
> + writel_relaxed(val, adpt->base + EMAC_AXI_MAST_CTRL);
Can you use emac_reg_update32() here?
> + writel_relaxed(0, adpt->base + EMAC_CLK_GATE_CTRL);
> + writel_relaxed(RX_UNCPL_INT_EN, adpt->base + EMAC_MISC_CTRL);
> + wmb(); /* ensure that the MAC configuration is flushed to HW */
> +}
> +
> +void emac_mac_reset(struct emac_adapter *adpt)
> +{
> + writel_relaxed(0, adpt->base + EMAC_INT_MASK);
> + writel_relaxed(DIS_INT, adpt->base + EMAC_INT_STATUS);
> +
> + emac_mac_stop(adpt);
> +
> + emac_reg_update32(adpt->base + EMAC_DMA_MAS_CTRL, 0, SOFT_RST);
> + wmb(); /* ensure mac is fully reset */
> + usleep_range(100, 150); /* reset may take upto 100usec */
> +
> + emac_reg_update32(adpt->base + EMAC_DMA_MAS_CTRL, 0, INT_RD_CLR_EN);
> + wmb(); /* ensure the interrupt clear-on-read setting is flushed to HW */
> +}
> +
> +void emac_mac_start(struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u32 mac, csr1;
> +
> + /* enable tx queue */
> + if (adpt->tx_q_cnt && (adpt->tx_q_cnt <= EMAC_MAX_TX_QUEUES))
> + emac_reg_update32(adpt->base + EMAC_TXQ_CTRL_0, 0, TXQ_EN);
> +
> + /* enable rx queue */
> + if (adpt->rx_q_cnt && (adpt->rx_q_cnt <= EMAC_MAX_RX_QUEUES))
> + emac_reg_update32(adpt->base + EMAC_RXQ_CTRL_0, 0, RXQ_EN);
> +
> + /* enable mac control */
> + mac = readl_relaxed(adpt->base + EMAC_MAC_CTRL);
> + csr1 = readl_relaxed(adpt->csr + EMAC_EMAC_WRAPPER_CSR1);
> +
> + mac |= TXEN | RXEN; /* enable RX/TX */
> +
> + /* enable RX/TX Flow Control */
> + switch (phy->cur_fc_mode) {
> + case EMAC_FC_FULL:
> + mac |= (TXFC | RXFC);
> + break;
> + case EMAC_FC_RX_PAUSE:
> + mac |= RXFC;
> + break;
> + case EMAC_FC_TX_PAUSE:
> + mac |= TXFC;
> + break;
> + default:
> + break;
> + }
> +
> + /* setup link speed */
> + mac &= ~SPEED_BMSK;
> + switch (phy->link_speed) {
> + case EMAC_LINK_SPEED_1GB_FULL:
> + mac |= ((emac_mac_speed_1000 << SPEED_SHFT) & SPEED_BMSK);
> + csr1 |= FREQ_MODE;
> + break;
> + default:
> + mac |= ((emac_mac_speed_10_100 << SPEED_SHFT) & SPEED_BMSK);
> + csr1 &= ~FREQ_MODE;
> + break;
> + }
> +
> + switch (phy->link_speed) {
> + case EMAC_LINK_SPEED_1GB_FULL:
> + case EMAC_LINK_SPEED_100_FULL:
> + case EMAC_LINK_SPEED_10_FULL:
> + mac |= FULLD;
> + break;
> + default:
> + mac &= ~FULLD;
> + }
> +
> + /* other parameters */
> + mac |= (CRCE | PCRCE);
> + mac |= ((adpt->preamble << PRLEN_SHFT) & PRLEN_BMSK);
> + mac |= BROAD_EN;
> + mac |= FLCHK;
> + mac &= ~RX_CHKSUM_EN;
> + mac &= ~(HUGEN | VLAN_STRIP | TPAUSE | SIMR | HUGE | MULTI_ALL |
> + DEBUG_MODE | SINGLE_PAUSE_MODE);
> +
> + writel_relaxed(csr1, adpt->csr + EMAC_EMAC_WRAPPER_CSR1);
> +
> + writel_relaxed(mac, adpt->base + EMAC_MAC_CTRL);
> +
> + /* enable interrupt read clear, low power sleep mode and
> + * the irq moderators
> + */
> +
> + writel_relaxed(adpt->irq_mod, adpt->base + EMAC_IRQ_MOD_TIM_INIT);
> + writel_relaxed(INT_RD_CLR_EN | LPW_MODE | IRQ_MODERATOR_EN |
> + IRQ_MODERATOR2_EN, adpt->base + EMAC_DMA_MAS_CTRL);
> +
> + emac_mac_mode_config(adpt);
> +
> + emac_reg_update32(adpt->base + EMAC_ATHR_HEADER_CTRL,
> + (HEADER_ENABLE | HEADER_CNT_EN), 0);
> +
> + emac_reg_update32(adpt->csr + EMAC_EMAC_WRAPPER_CSR2, 0, WOL_EN);
> + wmb(); /* ensure that MAC setting are flushed to HW */
> +}
> +
> +void emac_mac_stop(struct emac_adapter *adpt)
> +{
> + emac_reg_update32(adpt->base + EMAC_RXQ_CTRL_0, RXQ_EN, 0);
> + emac_reg_update32(adpt->base + EMAC_TXQ_CTRL_0, TXQ_EN, 0);
> + emac_reg_update32(adpt->base + EMAC_MAC_CTRL, (TXEN | RXEN), 0);
> + wmb(); /* ensure mac is stopped before we proceed */
> + usleep_range(1000, 1050); /* stopping may take upto 1msec */
> +}
> +
> +/* set MAC address */
> +void emac_mac_addr_clear(struct emac_adapter *adpt, u8 *addr)
> +{
> + u32 sta;
> +
> + /* for example: 00-A0-C6-11-22-33
> + * 0<-->C6112233, 1<-->00A0.
> + */
> +
> + /* low 32bit word */
> + sta = (((u32)addr[2]) << 24) | (((u32)addr[3]) << 16) |
> + (((u32)addr[4]) << 8) | (((u32)addr[5]));
> + writel_relaxed(sta, adpt->base + EMAC_MAC_STA_ADDR0);
> +
> + /* hight 32bit word */
> + sta = (((u32)addr[0]) << 8) | (((u32)addr[1]));
> + writel_relaxed(sta, adpt->base + EMAC_MAC_STA_ADDR1);
> + wmb(); /* ensure that the MAC address is flushed to HW */
> +}
> +
> +/* Read one entry from the HW tx timestamp FIFO */
> +static bool emac_mac_tx_ts_read(struct emac_adapter *adpt,
> + struct emac_tx_ts *ts)
> +{
> + u32 ts_idx;
> +
> + ts_idx = readl_relaxed(adpt->csr + EMAC_EMAC_WRAPPER_TX_TS_INX);
> +
> + if (ts_idx & EMAC_WRAPPER_TX_TS_EMPTY)
> + return false;
> +
> + ts->ns = readl_relaxed(adpt->csr + EMAC_EMAC_WRAPPER_TX_TS_LO);
> + ts->sec = readl_relaxed(adpt->csr + EMAC_EMAC_WRAPPER_TX_TS_HI);
> + ts->ts_idx = ts_idx & EMAC_WRAPPER_TX_TS_INX_BMSK;
> +
> + return true;
> +}
> +
> +/* Free all descriptors of given transmit queue */
> +static void emac_tx_q_descs_free(struct emac_adapter *adpt,
> + struct emac_tx_queue *tx_q)
> +{
> + size_t size;
> + int i;
> +
> + /* ring already cleared, nothing to do */
> + if (!tx_q->tpd.tpbuff)
> + return;
> +
> + for (i = 0; i < tx_q->tpd.count; i++) {
> + struct emac_buffer *tpbuf = GET_TPD_BUFFER(tx_q, i);
> +
> + if (tpbuf->dma) {
> + dma_unmap_single(adpt->netdev->dev.parent, tpbuf->dma,
> + tpbuf->length, DMA_TO_DEVICE);
> + tpbuf->dma = 0;
> + }
> + if (tpbuf->skb) {
> + dev_kfree_skb_any(tpbuf->skb);
> + tpbuf->skb = NULL;
> + }
> + }
> +
> + size = sizeof(struct emac_buffer) * tx_q->tpd.count;
> + memset(tx_q->tpd.tpbuff, 0, size);
> +
> + /* clear the descriptor ring */
> + memset(tx_q->tpd.v_addr, 0, tx_q->tpd.size);
> +
> + tx_q->tpd.consume_idx = 0;
> + tx_q->tpd.produce_idx = 0;
> +}
> +
> +static void emac_tx_q_descs_free_all(struct emac_adapter *adpt)
> +{
> + int i;
> +
> + for (i = 0; i < adpt->tx_q_cnt; i++)
> + emac_tx_q_descs_free(adpt, &adpt->tx_q[i]);
> + netdev_reset_queue(adpt->netdev);
> +}
> +
> +/* Free all descriptors of given receive queue */
> +static void emac_rx_q_free_descs(struct emac_adapter *adpt,
> + struct emac_rx_queue *rx_q)
> +{
> + struct device *dev = adpt->netdev->dev.parent;
> + size_t size;
> + int i;
> +
> + /* ring already cleared, nothing to do */
> + if (!rx_q->rfd.rfbuff)
> + return;
> +
> + for (i = 0; i < rx_q->rfd.count; i++) {
> + struct emac_buffer *rfbuf = GET_RFD_BUFFER(rx_q, i);
> +
> + if (rfbuf->dma) {
> + dma_unmap_single(dev, rfbuf->dma, rfbuf->length,
> + DMA_FROM_DEVICE);
> + rfbuf->dma = 0;
> + }
> + if (rfbuf->skb) {
> + dev_kfree_skb(rfbuf->skb);
> + rfbuf->skb = NULL;
> + }
> + }
> +
> + size = sizeof(struct emac_buffer) * rx_q->rfd.count;
> + memset(rx_q->rfd.rfbuff, 0, size);
> +
> + /* clear the descriptor rings */
> + memset(rx_q->rrd.v_addr, 0, rx_q->rrd.size);
> + rx_q->rrd.produce_idx = 0;
> + rx_q->rrd.consume_idx = 0;
> +
> + memset(rx_q->rfd.v_addr, 0, rx_q->rfd.size);
> + rx_q->rfd.produce_idx = 0;
> + rx_q->rfd.consume_idx = 0;
> +}
> +
> +static void emac_rx_q_free_descs_all(struct emac_adapter *adpt)
> +{
> + int i;
> +
> + for (i = 0; i < adpt->rx_q_cnt; i++)
> + emac_rx_q_free_descs(adpt, &adpt->rx_q[i]);
> +}
> +
> +/* Free all buffers associated with given transmit queue */
> +static void emac_tx_q_bufs_free(struct emac_adapter *adpt, int que_idx)
> +{
> + struct emac_tx_queue *tx_q = &adpt->tx_q[que_idx];
> +
> + emac_tx_q_descs_free(adpt, tx_q);
> +
> + kfree(tx_q->tpd.tpbuff);
> + tx_q->tpd.tpbuff = NULL;
> + tx_q->tpd.v_addr = NULL;
> + tx_q->tpd.p_addr = 0;
> + tx_q->tpd.size = 0;
> +}
> +
> +static void emac_tx_q_bufs_free_all(struct emac_adapter *adpt)
> +{
> + int i;
> +
> + for (i = 0; i < adpt->tx_q_cnt; i++)
> + emac_tx_q_bufs_free(adpt, i);
> +}
> +
> +/* Allocate TX descriptor ring for the given transmit queue */
> +static int emac_tx_q_desc_alloc(struct emac_adapter *adpt,
> + struct emac_tx_queue *tx_q)
> +{
> + struct emac_ring_header *ring_header = &adpt->ring_header;
> + size_t size;
> +
> + size = sizeof(struct emac_buffer) * tx_q->tpd.count;
> + tx_q->tpd.tpbuff = kzalloc(size, GFP_KERNEL);
> + if (!tx_q->tpd.tpbuff)
> + return -ENOMEM;
> +
> + tx_q->tpd.size = tx_q->tpd.count * (adpt->tpd_size * 4);
> + tx_q->tpd.p_addr = ring_header->p_addr + ring_header->used;
> + tx_q->tpd.v_addr = ring_header->v_addr + ring_header->used;
> + ring_header->used += ALIGN(tx_q->tpd.size, 8);
> + tx_q->tpd.produce_idx = 0;
> + tx_q->tpd.consume_idx = 0;
> +
> + return 0;
> +}
> +
> +static int emac_tx_q_desc_alloc_all(struct emac_adapter *adpt)
> +{
> + int retval = 0;
> + int i;
> +
> + for (i = 0; i < adpt->tx_q_cnt; i++) {
> + retval = emac_tx_q_desc_alloc(adpt, &adpt->tx_q[i]);
> + if (retval)
> + break;
> + }
> +
> + if (retval) {
> + netdev_err(adpt->netdev, "error: Tx Queue %u alloc failed\n",
> + i);
> + for (i--; i > 0; i--)
> + emac_tx_q_bufs_free(adpt, i);
> + }
> +
> + return retval;
> +}
> +
> +/* Free all buffers associated with given transmit queue */
> +static void emac_rx_q_free_bufs(struct emac_adapter *adpt,
> + struct emac_rx_queue *rx_q)
> +{
> + emac_rx_q_free_descs(adpt, rx_q);
> +
> + kfree(rx_q->rfd.rfbuff);
> + rx_q->rfd.rfbuff = NULL;
> +
> + rx_q->rfd.v_addr = NULL;
> + rx_q->rfd.p_addr = 0;
> + rx_q->rfd.size = 0;
> +
> + rx_q->rrd.v_addr = NULL;
> + rx_q->rrd.p_addr = 0;
> + rx_q->rrd.size = 0;
> +}
> +
> +static void emac_rx_q_free_bufs_all(struct emac_adapter *adpt)
> +{
> + int i;
> +
> + for (i = 0; i < adpt->rx_q_cnt; i++)
> + emac_rx_q_free_bufs(adpt, &adpt->rx_q[i]);
> +}
> +
> +/* Allocate RX descriptor rings for the given receive queue */
> +static int emac_rx_descs_alloc(struct emac_adapter *adpt,
> + struct emac_rx_queue *rx_q)
> +{
> + struct emac_ring_header *ring_header = &adpt->ring_header;
> + unsigned long size;
> +
> + size = sizeof(struct emac_buffer) * rx_q->rfd.count;
> + rx_q->rfd.rfbuff = kzalloc(size, GFP_KERNEL);
> + if (!rx_q->rfd.rfbuff)
> + return -ENOMEM;
> +
> + rx_q->rrd.size = rx_q->rrd.count * (adpt->rrd_size * 4);
> + rx_q->rfd.size = rx_q->rfd.count * (adpt->rfd_size * 4);
> +
> + rx_q->rrd.p_addr = ring_header->p_addr + ring_header->used;
> + rx_q->rrd.v_addr = ring_header->v_addr + ring_header->used;
> + ring_header->used += ALIGN(rx_q->rrd.size, 8);
> +
> + rx_q->rfd.p_addr = ring_header->p_addr + ring_header->used;
> + rx_q->rfd.v_addr = ring_header->v_addr + ring_header->used;
> + ring_header->used += ALIGN(rx_q->rfd.size, 8);
> +
> + rx_q->rrd.produce_idx = 0;
> + rx_q->rrd.consume_idx = 0;
> +
> + rx_q->rfd.produce_idx = 0;
> + rx_q->rfd.consume_idx = 0;
> +
> + return 0;
> +}
> +
> +static int emac_rx_descs_allocs_all(struct emac_adapter *adpt)
> +{
> + int retval = 0;
> + int i;
> +
> + for (i = 0; i < adpt->rx_q_cnt; i++) {
> + retval = emac_rx_descs_alloc(adpt, &adpt->rx_q[i]);
> + if (retval)
> + break;
> + }
> +
> + if (retval) {
> + netdev_err(adpt->netdev, "error: Rx Queue %d alloc failed\n",
> + i);
> + for (i--; i > 0; i--)
> + emac_rx_q_free_bufs(adpt, &adpt->rx_q[i]);
> + }
> +
> + return retval;
> +}
> +
> +/* Allocate all TX and RX descriptor rings */
> +int emac_mac_rx_tx_rings_alloc_all(struct emac_adapter *adpt)
> +{
> + struct emac_ring_header *ring_header = &adpt->ring_header;
> + int num_tques = adpt->tx_q_cnt;
> + int num_rques = adpt->rx_q_cnt;
> + unsigned int num_tx_descs = adpt->tx_desc_cnt;
> + unsigned int num_rx_descs = adpt->rx_desc_cnt;
> + struct device *dev = adpt->netdev->dev.parent;
> + int retval, que_idx;
> +
> + for (que_idx = 0; que_idx < adpt->tx_q_cnt; que_idx++)
> + adpt->tx_q[que_idx].tpd.count = adpt->tx_desc_cnt;
> +
> + for (que_idx = 0; que_idx < adpt->rx_q_cnt; que_idx++) {
> + adpt->rx_q[que_idx].rrd.count = adpt->rx_desc_cnt;
> + adpt->rx_q[que_idx].rfd.count = adpt->rx_desc_cnt;
> + }
> +
> + /* Ring DMA buffer. Each ring may need up to 8 bytes for alignment,
> + * hence the additional padding bytes are allocated.
> + */
> + ring_header->size =
> + num_tques * num_tx_descs * (adpt->tpd_size * 4) +
> + num_rques * num_rx_descs * (adpt->rfd_size * 4) +
> + num_rques * num_rx_descs * (adpt->rrd_size * 4) +
> + num_tques * 8 + num_rques * 2 * 8;
> +
> + netif_info(adpt, ifup, adpt->netdev,
> + "TX queues %d, TX descriptors %d\n", num_tques,
> + num_tx_descs);
> + netif_info(adpt, ifup, adpt->netdev,
> + "RX queues %d, Rx descriptors %d\n", num_rques,
> + num_rx_descs);
> +
> + ring_header->used = 0;
> + ring_header->v_addr = dma_alloc_coherent(dev, ring_header->size,
> + &ring_header->p_addr,
> + GFP_KERNEL);
> + if (!ring_header->v_addr)
> + return -ENOMEM;
> +
> + memset(ring_header->v_addr, 0, ring_header->size);
> + ring_header->used = ALIGN(ring_header->p_addr, 8) - ring_header->p_addr;
> +
> + retval = emac_tx_q_desc_alloc_all(adpt);
> + if (retval)
> + goto err_alloc_tx;
> +
> + retval = emac_rx_descs_allocs_all(adpt);
> + if (retval)
> + goto err_alloc_rx;
> +
> + return 0;
> +
> +err_alloc_rx:
> + emac_tx_q_bufs_free_all(adpt);
> +err_alloc_tx:
> + dma_free_coherent(dev, ring_header->size,
> + ring_header->v_addr, ring_header->p_addr);
> +
> + ring_header->v_addr = NULL;
> + ring_header->p_addr = 0;
> + ring_header->size = 0;
> + ring_header->used = 0;
> +
> + return retval;
> +}
> +
> +/* Free all TX and RX descriptor rings */
> +void emac_mac_rx_tx_rings_free_all(struct emac_adapter *adpt)
> +{
> + struct emac_ring_header *ring_header = &adpt->ring_header;
> + struct device *dev = adpt->netdev->dev.parent;
> +
> + emac_tx_q_bufs_free_all(adpt);
> + emac_rx_q_free_bufs_all(adpt);
> +
> + dma_free_coherent(dev, ring_header->size,
> + ring_header->v_addr, ring_header->p_addr);
> +
> + ring_header->v_addr = NULL;
> + ring_header->p_addr = 0;
> + ring_header->size = 0;
> + ring_header->used = 0;
> +}
> +
> +/* Initialize descriptor rings */
> +static void emac_mac_rx_tx_ring_reset_all(struct emac_adapter *adpt)
> +{
> + int i, j;
> +
> + for (i = 0; i < adpt->tx_q_cnt; i++) {
> + struct emac_tx_queue *tx_q = &adpt->tx_q[i];
> + struct emac_buffer *tpbuf = tx_q->tpd.tpbuff;
> +
> + tx_q->tpd.produce_idx = 0;
> + tx_q->tpd.consume_idx = 0;
> + for (j = 0; j < tx_q->tpd.count; j++)
> + tpbuf[j].dma = 0;
> + }
> +
> + for (i = 0; i < adpt->rx_q_cnt; i++) {
> + struct emac_rx_queue *rx_q = &adpt->rx_q[i];
> + struct emac_buffer *rfbuf = rx_q->rfd.rfbuff;
> +
> + rx_q->rrd.produce_idx = 0;
> + rx_q->rrd.consume_idx = 0;
> + rx_q->rfd.produce_idx = 0;
> + rx_q->rfd.consume_idx = 0;
> + for (j = 0; j < rx_q->rfd.count; j++)
> + rfbuf[j].dma = 0;
> + }
> +}
> +
> +/* Configure Receive Side Scaling (RSS) */
> +static void emac_rss_config(struct emac_adapter *adpt)
> +{
> + static const u8 key[40] = {
> + 0x6D, 0x5A, 0x56, 0xDA, 0x25, 0x5B, 0x0E, 0xC2,
> + 0x41, 0x67, 0x25, 0x3D, 0x43, 0xA3, 0x8F, 0xB0,
> + 0xD0, 0xCA, 0x2B, 0xCB, 0xAE, 0x7B, 0x30, 0xB4,
> + 0x77, 0xCB, 0x2D, 0xA3, 0x80, 0x30, 0xF2, 0x0C,
> + 0x6A, 0x42, 0xB7, 0x3B, 0xBE, 0xAC, 0x01, 0xFA
> + };
> + u32 reta = 0;
> + int i, j;
> +
> + if (adpt->rx_q_cnt == 1)
> + return;
> +
> + if (!adpt->rss_initialized) {
> + adpt->rss_initialized = true;
> + /* initialize rss hash type and idt table size */
> + adpt->rss_hstype = EMAC_RSS_HSTYP_ALL_EN;
> + adpt->rss_idt_size = EMAC_RSS_IDT_SIZE;
> +
> + /* Fill out RSS key */
> + memcpy(adpt->rss_key, key, sizeof(adpt->rss_key));
> +
> + /* Fill out redirection table */
> + memset(adpt->rss_idt, 0x0, sizeof(adpt->rss_idt));
> + for (i = 0, j = 0; i < EMAC_RSS_IDT_SIZE; i++, j++) {
> + if (j == adpt->rx_q_cnt)
> + j = 0;
> + if (j > 1)
> + reta |= (j << ((i & 7) * 4));
> + if ((i & 7) == 7) {
> + adpt->rss_idt[(i >> 3)] = reta;
> + reta = 0;
> + }
> + }
> + }
> +
> + emac_mac_rss_config(adpt);
> +}
> +
> +/* Produce new receive free descriptor */
> +static void emac_mac_rx_rfd_create(struct emac_adapter *adpt,
> + struct emac_rx_queue *rx_q,
> + union emac_rfd *rfd)
> +{
> + u32 *hw_rfd = EMAC_RFD(rx_q, adpt->rfd_size,
> + rx_q->rfd.produce_idx);
> +
> + *(hw_rfd++) = rfd->word[0];
> + *hw_rfd = rfd->word[1];
> +
> + if (++rx_q->rfd.produce_idx == rx_q->rfd.count)
> + rx_q->rfd.produce_idx = 0;
> +}
> +
> +/* Fill up receive queue's RFD with preallocated receive buffers */
> +static int emac_mac_rx_descs_refill(struct emac_adapter *adpt,
> + struct emac_rx_queue *rx_q)
> +{
> + struct emac_buffer *curr_rxbuf;
> + struct emac_buffer *next_rxbuf;
> + union emac_rfd rfd;
> + struct sk_buff *skb;
> + void *skb_data = NULL;
> + int count = 0;
> + u32 next_produce_idx;
> +
> + next_produce_idx = rx_q->rfd.produce_idx;
> + if (++next_produce_idx == rx_q->rfd.count)
> + next_produce_idx = 0;
> + curr_rxbuf = GET_RFD_BUFFER(rx_q, rx_q->rfd.produce_idx);
> + next_rxbuf = GET_RFD_BUFFER(rx_q, next_produce_idx);
> +
> + /* this always has a blank rx_buffer*/
> + while (!next_rxbuf->dma) {
> + skb = dev_alloc_skb(adpt->rxbuf_size + NET_IP_ALIGN);
> + if (!skb)
> + break;
> +
> + /* Make buffer alignment 2 beyond a 16 byte boundary
> + * this will result in a 16 byte aligned IP header after
> + * the 14 byte MAC header is removed
> + */
> + skb_reserve(skb, NET_IP_ALIGN);
> + skb_data = skb->data;
> + curr_rxbuf->skb = skb;
> + curr_rxbuf->length = adpt->rxbuf_size;
> + curr_rxbuf->dma = dma_map_single(adpt->netdev->dev.parent,
> + skb_data, curr_rxbuf->length,
> + DMA_FROM_DEVICE);
> + rfd.addr = curr_rxbuf->dma;
> + emac_mac_rx_rfd_create(adpt, rx_q, &rfd);
> + next_produce_idx = rx_q->rfd.produce_idx;
> + if (++next_produce_idx == rx_q->rfd.count)
> + next_produce_idx = 0;
> +
> + curr_rxbuf = GET_RFD_BUFFER(rx_q, rx_q->rfd.produce_idx);
> + next_rxbuf = GET_RFD_BUFFER(rx_q, next_produce_idx);
> + count++;
> + }
> +
> + if (count) {
> + u32 prod_idx = (rx_q->rfd.produce_idx << rx_q->produce_shft) &
> + rx_q->produce_mask;
> + wmb(); /* ensure that the descriptors are properly set */
> + emac_reg_update32(adpt->base + rx_q->produce_reg,
> + rx_q->produce_mask, prod_idx);
> + wmb(); /* ensure that the producer's index is flushed to HW */
> + netif_dbg(adpt, rx_status, adpt->netdev,
> + "RX[%d]: prod idx 0x%x\n", rx_q->que_idx,
> + rx_q->rfd.produce_idx);
> + }
> +
> + return count;
> +}
> +
> +/* Bringup the interface/HW */
> +int emac_mac_up(struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> +
> + struct net_device *netdev = adpt->netdev;
> + int retval = 0;
> + int i;
> +
> + emac_mac_rx_tx_ring_reset_all(adpt);
> + emac_rx_mode_set(netdev);
> +
> + emac_mac_config(adpt);
> + emac_rss_config(adpt);
> +
> + retval = emac_phy_up(adpt);
> + if (retval)
> + return retval;
> +
> + for (i = 0; phy->uses_gpios && i < EMAC_GPIO_CNT; i++) {
> + retval = gpio_request(adpt->gpio[i], emac_gpio_name[i]);
> + if (retval) {
> + netdev_err(adpt->netdev,
> + "error:%d on gpio_request(%d:%s)\n",
> + retval, adpt->gpio[i], emac_gpio_name[i]);
> + while (--i >= 0)
> + gpio_free(adpt->gpio[i]);
> + goto err_request_gpio;
> + }
> + }
> +
> + for (i = 0; i < EMAC_IRQ_CNT; i++) {
> + struct emac_irq *irq = &adpt->irq[i];
> + const struct emac_irq_config *irq_cfg = &emac_irq_cfg_tbl[i];
> +
> + if (!irq->irq)
> + continue;
> +
> + retval = request_irq(irq->irq, irq_cfg->handler,
> + irq_cfg->irqflags, irq_cfg->name, irq);
> + if (retval) {
> + netdev_err(adpt->netdev,
> + "error:%d on request_irq(%d:%s flags:0x%lx)\n",
> + retval, irq->irq, irq_cfg->name,
> + irq_cfg->irqflags);
> + while (--i >= 0)
> + if (adpt->irq[i].irq)
> + free_irq(adpt->irq[i].irq,
> + &adpt->irq[i]);
> + goto err_request_irq;
> + }
> + }
> +
> + for (i = 0; i < adpt->rx_q_cnt; i++)
> + emac_mac_rx_descs_refill(adpt, &adpt->rx_q[i]);
> +
> + for (i = 0; i < adpt->rx_q_cnt; i++)
> + napi_enable(&adpt->rx_q[i].napi);
> +
> + emac_mac_irq_enable(adpt);
> +
> + netif_start_queue(netdev);
> + clear_bit(EMAC_STATUS_DOWN, &adpt->status);
> +
> + /* check link status */
> + set_bit(EMAC_STATUS_TASK_LSC_REQ, &adpt->status);
> + adpt->link_chk_timeout = jiffies + EMAC_TRY_LINK_TIMEOUT;
> + mod_timer(&adpt->timers, jiffies);
> +
> + return retval;
> +
> +err_request_irq:
> + for (i = 0; adpt->phy.uses_gpios && i < EMAC_GPIO_CNT; i++)
> + gpio_free(adpt->gpio[i]);
> +err_request_gpio:
> + emac_phy_down(adpt);
> + return retval;
> +}
> +
> +/* Bring down the interface/HW */
> +void emac_mac_down(struct emac_adapter *adpt, bool reset)
> +{
> + struct net_device *netdev = adpt->netdev;
> + struct emac_phy *phy = &adpt->phy;
> +
> + unsigned long flags;
> + int i;
> +
> + set_bit(EMAC_STATUS_DOWN, &adpt->status);
> +
> + netif_stop_queue(netdev);
> + netif_carrier_off(netdev);
> + emac_mac_irq_disable(adpt);
> +
> + for (i = 0; i < adpt->rx_q_cnt; i++)
> + napi_disable(&adpt->rx_q[i].napi);
> +
> + emac_phy_down(adpt);
> +
> + for (i = 0; i < EMAC_IRQ_CNT; i++)
> + if (adpt->irq[i].irq)
> + free_irq(adpt->irq[i].irq, &adpt->irq[i]);
> +
> + for (i = 0; phy->uses_gpios && i < EMAC_GPIO_CNT; i++)
> + gpio_free(adpt->gpio[i]);
> +
> + clear_bit(EMAC_STATUS_TASK_LSC_REQ, &adpt->status);
> + clear_bit(EMAC_STATUS_TASK_REINIT_REQ, &adpt->status);
> + clear_bit(EMAC_STATUS_TASK_CHK_SGMII_REQ, &adpt->status);
> + del_timer_sync(&adpt->timers);
> +
> + cancel_work_sync(&adpt->tx_ts_task);
> + spin_lock_irqsave(&adpt->tx_ts_lock, flags);
> + __skb_queue_purge(&adpt->tx_ts_pending_queue);
> + __skb_queue_purge(&adpt->tx_ts_ready_queue);
> + spin_unlock_irqrestore(&adpt->tx_ts_lock, flags);
> +
> + if (reset)
> + emac_mac_reset(adpt);
> +
> + pm_runtime_put_noidle(netdev->dev.parent);
> + phy->link_speed = EMAC_LINK_SPEED_UNKNOWN;
> + emac_tx_q_descs_free_all(adpt);
> + emac_rx_q_free_descs_all(adpt);
> +}
> +
> +/* Consume next received packet descriptor */
> +static bool emac_rx_process_rrd(struct emac_adapter *adpt,
> + struct emac_rx_queue *rx_q,
> + struct emac_rrd *rrd)
> +{
> + u32 *hw_rrd = EMAC_RRD(rx_q, adpt->rrd_size,
> + rx_q->rrd.consume_idx);
> +
> + /* If time stamping is enabled, it will be added in the beginning of
> + * the hw rrd (hw_rrd). In sw rrd (rrd), 32bit words 4 & 5 are reserved
> + * for the time stamp; hence the conversion.
> + * Also, read the rrd word with update flag first; read rest of rrd
> + * only if update flag is set.
> + */
> + if (adpt->timestamp_en)
> + rrd->word[3] = *(hw_rrd + 5);
> + else
> + rrd->word[3] = *(hw_rrd + 3);
> + rmb(); /* ensure hw receive returned descriptor timestamp is read */
> +
> + if (!RRD_UPDT(rrd))
> + return false;
> +
> + if (adpt->timestamp_en) {
> + rrd->word[4] = *(hw_rrd++);
> + rrd->word[5] = *(hw_rrd++);
> + } else {
> + rrd->word[4] = 0;
> + rrd->word[5] = 0;
> + }
> +
> + rrd->word[0] = *(hw_rrd++);
> + rrd->word[1] = *(hw_rrd++);
> + rrd->word[2] = *(hw_rrd++);
> + rmb(); /* ensure descriptor is read */
Why are the rmb()s necessary?
> +
> + netif_dbg(adpt, rx_status, adpt->netdev,
> + "RX[%d]:SRRD[%x]: %x:%x:%x:%x:%x:%x\n",
> + rx_q->que_idx, rx_q->rrd.consume_idx, rrd->word[0],
> + rrd->word[1], rrd->word[2], rrd->word[3],
> + rrd->word[4], rrd->word[5]);
> +
> + if (unlikely(RRD_NOR(rrd) != 1)) {
> + netdev_err(adpt->netdev,
> + "error: multi-RFD not support yet! nor:%lu\n",
> + RRD_NOR(rrd));
> + }
> +
> + /* mark rrd as processed */
> + RRD_UPDT_SET(rrd, 0);
> + *hw_rrd = rrd->word[3];
> +
> + if (++rx_q->rrd.consume_idx == rx_q->rrd.count)
> + rx_q->rrd.consume_idx = 0;
> +
> + return true;
> +}
> +
> +/* Produce new transmit descriptor */
> +static bool emac_tx_tpd_create(struct emac_adapter *adpt,
> + struct emac_tx_queue *tx_q, struct emac_tpd *tpd)
> +{
> + u32 *hw_tpd;
> +
> + tx_q->tpd.last_produce_idx = tx_q->tpd.produce_idx;
> + hw_tpd = EMAC_TPD(tx_q, adpt->tpd_size, tx_q->tpd.produce_idx);
> +
> + if (++tx_q->tpd.produce_idx == tx_q->tpd.count)
> + tx_q->tpd.produce_idx = 0;
> +
> + *(hw_tpd++) = tpd->word[0];
> + *(hw_tpd++) = tpd->word[1];
> + *(hw_tpd++) = tpd->word[2];
> + *hw_tpd = tpd->word[3];
> +
> + netif_dbg(adpt, tx_done, adpt->netdev, "TX[%d]:STPD[%x]: %x:%x:%x:%x\n",
> + tx_q->que_idx, tx_q->tpd.last_produce_idx, tpd->word[0],
> + tpd->word[1], tpd->word[2], tpd->word[3]);
> +
> + return true;
> +}
> +
> +/* Mark the last transmit descriptor as such (for the transmit packet) */
> +static void emac_tx_tpd_mark_last(struct emac_adapter *adpt,
> + struct emac_tx_queue *tx_q)
> +{
> + u32 tmp_tpd;
> + u32 *hw_tpd = EMAC_TPD(tx_q, adpt->tpd_size,
> + tx_q->tpd.last_produce_idx);
> +
> + tmp_tpd = *(hw_tpd + 1);
> + tmp_tpd |= EMAC_TPD_LAST_FRAGMENT;
> + *(hw_tpd + 1) = tmp_tpd;
> +}
> +
> +void emac_tx_tpd_ts_save(struct emac_adapter *adpt, struct emac_tx_queue *tx_q)
> +{
> + u32 tmp_tpd;
> + u32 *hw_tpd = EMAC_TPD(tx_q, adpt->tpd_size,
> + tx_q->tpd.last_produce_idx);
> +
> + tmp_tpd = *(hw_tpd + 3);
> + tmp_tpd |= EMAC_TPD_TSTAMP_SAVE;
> + *(hw_tpd + 3) = tmp_tpd;
> +}
> +
> +static void emac_rx_rfd_clean(struct emac_rx_queue *rx_q,
> + struct emac_rrd *rrd)
> +{
> + struct emac_buffer *rfbuf = rx_q->rfd.rfbuff;
> + u32 consume_idx = RRD_SI(rrd);
> + int i;
> +
> + for (i = 0; i < RRD_NOR(rrd); i++) {
> + rfbuf[consume_idx].skb = NULL;
> + if (++consume_idx == rx_q->rfd.count)
> + consume_idx = 0;
> + }
> +
> + rx_q->rfd.consume_idx = consume_idx;
> + rx_q->rfd.process_idx = consume_idx;
> +}
> +
> +/* proper lock must be acquired before polling */
> +static void emac_tx_ts_poll(struct emac_adapter *adpt)
> +{
> + struct sk_buff_head *pending_q = &adpt->tx_ts_pending_queue;
> + struct sk_buff_head *q = &adpt->tx_ts_ready_queue;
> + struct sk_buff *skb, *skb_tmp;
> + struct emac_tx_ts tx_ts;
> +
> + while (emac_mac_tx_ts_read(adpt, &tx_ts)) {
> + bool found = false;
> +
> + adpt->tx_ts_stats.rx++;
> +
> + skb_queue_walk_safe(pending_q, skb, skb_tmp) {
> + if (EMAC_SKB_CB(skb)->tpd_idx == tx_ts.ts_idx) {
> + struct sk_buff *pskb;
> +
> + EMAC_TX_TS_CB(skb)->sec = tx_ts.sec;
> + EMAC_TX_TS_CB(skb)->ns = tx_ts.ns;
> + /* the tx timestamps for all the pending
> + * packets before this one are lost
> + */
> + while ((pskb = __skb_dequeue(pending_q))
> + != skb) {
> + EMAC_TX_TS_CB(pskb)->sec = 0;
> + EMAC_TX_TS_CB(pskb)->ns = 0;
> + __skb_queue_tail(q, pskb);
> + adpt->tx_ts_stats.lost++;
> + }
> + __skb_queue_tail(q, skb);
> + found = true;
> + break;
> + }
> + }
> +
> + if (!found) {
> + netif_dbg(adpt, tx_done, adpt->netdev,
> + "no entry(tpd=%d) found, drop tx timestamp\n",
> + tx_ts.ts_idx);
> + adpt->tx_ts_stats.drop++;
> + }
> + }
> +
> + skb_queue_walk_safe(pending_q, skb, skb_tmp) {
> + /* No packet after this one expires */
> + if (time_is_after_jiffies(EMAC_SKB_CB(skb)->jiffies +
> + msecs_to_jiffies(100)))
> + break;
> + adpt->tx_ts_stats.timeout++;
> + netif_dbg(adpt, tx_done, adpt->netdev,
> + "tx timestamp timeout: tpd_idx=%d\n",
> + EMAC_SKB_CB(skb)->tpd_idx);
> +
> + __skb_unlink(skb, pending_q);
> + EMAC_TX_TS_CB(skb)->sec = 0;
> + EMAC_TX_TS_CB(skb)->ns = 0;
> + __skb_queue_tail(q, skb);
> + }
> +}
> +
> +static void emac_schedule_tx_ts_task(struct emac_adapter *adpt)
> +{
> + if (test_bit(EMAC_STATUS_DOWN, &adpt->status))
> + return;
> +
> + if (schedule_work(&adpt->tx_ts_task))
> + adpt->tx_ts_stats.sched++;
> +}
> +
> +void emac_mac_tx_ts_periodic_routine(struct work_struct *work)
> +{
> + struct emac_adapter *adpt = container_of(work, struct emac_adapter,
> + tx_ts_task);
> + struct sk_buff *skb;
> + struct sk_buff_head q;
> + unsigned long flags;
> +
> + adpt->tx_ts_stats.poll++;
> +
> + __skb_queue_head_init(&q);
> +
> + while (1) {
> + spin_lock_irqsave(&adpt->tx_ts_lock, flags);
> + if (adpt->tx_ts_pending_queue.qlen)
> + emac_tx_ts_poll(adpt);
> + skb_queue_splice_tail_init(&adpt->tx_ts_ready_queue, &q);
> + spin_unlock_irqrestore(&adpt->tx_ts_lock, flags);
> +
> + if (!q.qlen)
> + break;
> +
> + while ((skb = __skb_dequeue(&q))) {
> + struct emac_tx_ts_cb *cb = EMAC_TX_TS_CB(skb);
> +
> + if (cb->sec || cb->ns) {
> + struct skb_shared_hwtstamps ts;
> +
> + ts.hwtstamp = ktime_set(cb->sec, cb->ns);
> + skb_tstamp_tx(skb, &ts);
> + adpt->tx_ts_stats.deliver++;
> + }
> + dev_kfree_skb_any(skb);
> + }
> + }
> +
> + if (adpt->tx_ts_pending_queue.qlen)
> + emac_schedule_tx_ts_task(adpt);
> +}
> +
> +/* Push the received skb to upper layers */
> +static void emac_receive_skb(struct emac_rx_queue *rx_q,
> + struct sk_buff *skb,
> + u16 vlan_tag, bool vlan_flag)
> +{
> + if (vlan_flag) {
> + u16 vlan;
> +
> + EMAC_TAG_TO_VLAN(vlan_tag, vlan);
> + __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan);
> + }
> +
> + napi_gro_receive(&rx_q->napi, skb);
> +}
> +
> +/* Process receive event */
> +void emac_mac_rx_process(struct emac_adapter *adpt, struct emac_rx_queue *rx_q,
> + int *num_pkts, int max_pkts)
> +{
> + struct net_device *netdev = adpt->netdev;
> +
> + struct emac_rrd rrd;
> + struct emac_buffer *rfbuf;
> + struct sk_buff *skb;
> +
> + u32 hw_consume_idx, num_consume_pkts;
> + unsigned int count = 0;
> + u32 proc_idx;
> + u32 reg = readl_relaxed(adpt->base + rx_q->consume_reg);
> +
> + hw_consume_idx = (reg & rx_q->consume_mask) >> rx_q->consume_shft;
> + num_consume_pkts = (hw_consume_idx >= rx_q->rrd.consume_idx) ?
> + (hw_consume_idx - rx_q->rrd.consume_idx) :
> + (hw_consume_idx + rx_q->rrd.count - rx_q->rrd.consume_idx);
> +
> + do {
> + if (!num_consume_pkts)
> + break;
> +
> + if (!emac_rx_process_rrd(adpt, rx_q, &rrd))
> + break;
> +
> + if (likely(RRD_NOR(&rrd) == 1)) {
> + /* good receive */
> + rfbuf = GET_RFD_BUFFER(rx_q, RRD_SI(&rrd));
> + dma_unmap_single(adpt->netdev->dev.parent, rfbuf->dma,
> + rfbuf->length, DMA_FROM_DEVICE);
> + rfbuf->dma = 0;
> + skb = rfbuf->skb;
> + } else {
> + netdev_err(adpt->netdev,
> + "error: multi-RFD not support yet!\n");
> + break;
> + }
> + emac_rx_rfd_clean(rx_q, &rrd);
> + num_consume_pkts--;
> + count++;
> +
> + /* Due to a HW issue in L4 check sum detection (UDP/TCP frags
> + * with DF set are marked as error), drop packets based on the
> + * error mask rather than the summary bit (ignoring L4F errors)
> + */
> + if (rrd.word[EMAC_RRD_STATS_DW_IDX] & EMAC_RRD_ERROR) {
> + netif_dbg(adpt, rx_status, adpt->netdev,
> + "Drop error packet[RRD: 0x%x:0x%x:0x%x:0x%x]\n",
> + rrd.word[0], rrd.word[1],
> + rrd.word[2], rrd.word[3]);
> +
> + dev_kfree_skb(skb);
> + continue;
> + }
> +
> + skb_put(skb, RRD_PKT_SIZE(&rrd) - ETH_FCS_LEN);
> + skb->dev = netdev;
> + skb->protocol = eth_type_trans(skb, skb->dev);
> + if (netdev->features & NETIF_F_RXCSUM)
> + skb->ip_summed = (RRD_L4F(&rrd) ?
> + CHECKSUM_NONE : CHECKSUM_UNNECESSARY);
> + else
> + skb_checksum_none_assert(skb);
> +
> + if (test_bit(EMAC_STATUS_TS_RX_EN, &adpt->status)) {
> + struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
> +
> + hwts->hwtstamp = ktime_set(RRD_TS_HI(&rrd),
> + RRD_TS_LOW(&rrd));
> + }
> +
> + emac_receive_skb(rx_q, skb, (u16)RRD_CVALN_TAG(&rrd),
> + (bool)RRD_CVTAG(&rrd));
> +
> + netdev->last_rx = jiffies;
> + (*num_pkts)++;
> + } while (*num_pkts < max_pkts);
> +
> + if (count) {
> + proc_idx = (rx_q->rfd.process_idx << rx_q->process_shft) &
> + rx_q->process_mask;
> + wmb(); /* ensure that the descriptors are properly cleared */
> + emac_reg_update32(adpt->base + rx_q->process_reg,
> + rx_q->process_mask, proc_idx);
> + wmb(); /* ensure that RFD producer index is flushed to HW */
> + netif_dbg(adpt, rx_status, adpt->netdev,
> + "RX[%d]: proc idx 0x%x\n", rx_q->que_idx,
> + rx_q->rfd.process_idx);
> +
> + emac_mac_rx_descs_refill(adpt, rx_q);
> + }
> +}
> +
> +/* Process transmit event */
> +void emac_mac_tx_process(struct emac_adapter *adpt, struct emac_tx_queue *tx_q)
> +{
> + struct emac_buffer *tpbuf;
> + u32 hw_consume_idx;
> + u32 pkts_compl = 0, bytes_compl = 0;
> + u32 reg = readl_relaxed(adpt->base + tx_q->consume_reg);
> +
> + hw_consume_idx = (reg & tx_q->consume_mask) >> tx_q->consume_shft;
> +
> + netif_dbg(adpt, tx_done, adpt->netdev, "TX[%d]: cons idx 0x%x\n",
> + tx_q->que_idx, hw_consume_idx);
> +
> + while (tx_q->tpd.consume_idx != hw_consume_idx) {
> + tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.consume_idx);
> + if (tpbuf->dma) {
> + dma_unmap_single(adpt->netdev->dev.parent, tpbuf->dma,
> + tpbuf->length, DMA_TO_DEVICE);
> + tpbuf->dma = 0;
> + }
> +
> + if (tpbuf->skb) {
> + pkts_compl++;
> + bytes_compl += tpbuf->skb->len;
> + dev_kfree_skb_irq(tpbuf->skb);
> + tpbuf->skb = NULL;
> + }
> +
> + if (++tx_q->tpd.consume_idx == tx_q->tpd.count)
> + tx_q->tpd.consume_idx = 0;
> + }
> +
> + if (pkts_compl || bytes_compl)
> + netdev_completed_queue(adpt->netdev, pkts_compl, bytes_compl);
> +}
> +
> +/* Initialize all queue data structures */
> +void emac_mac_rx_tx_ring_init_all(struct platform_device *pdev,
> + struct emac_adapter *adpt)
> +{
> + int que_idx;
> +
> + adpt->tx_q_cnt = EMAC_DEF_TX_QUEUES;
> + adpt->rx_q_cnt = EMAC_DEF_RX_QUEUES;
> +
> + for (que_idx = 0; que_idx < adpt->tx_q_cnt; que_idx++)
> + adpt->tx_q[que_idx].que_idx = que_idx;
> +
> + for (que_idx = 0; que_idx < adpt->rx_q_cnt; que_idx++) {
> + struct emac_rx_queue *rx_q = &adpt->rx_q[que_idx];
> +
> + rx_q->que_idx = que_idx;
> + rx_q->netdev = adpt->netdev;
> + }
> +
> + switch (adpt->rx_q_cnt) {
> + case 4:
> + adpt->rx_q[3].produce_reg = EMAC_MAILBOX_13;
> + adpt->rx_q[3].produce_mask = RFD3_PROD_IDX_BMSK;
> + adpt->rx_q[3].produce_shft = RFD3_PROD_IDX_SHFT;
> +
> + adpt->rx_q[3].process_reg = EMAC_MAILBOX_13;
> + adpt->rx_q[3].process_mask = RFD3_PROC_IDX_BMSK;
> + adpt->rx_q[3].process_shft = RFD3_PROC_IDX_SHFT;
> +
> + adpt->rx_q[3].consume_reg = EMAC_MAILBOX_8;
> + adpt->rx_q[3].consume_mask = RFD3_CONS_IDX_BMSK;
> + adpt->rx_q[3].consume_shft = RFD3_CONS_IDX_SHFT;
> +
> + adpt->rx_q[3].irq = &adpt->irq[3];
> + adpt->rx_q[3].intr = adpt->irq[3].mask & ISR_RX_PKT;
> +
> + /* fall through */
> + case 3:
> + adpt->rx_q[2].produce_reg = EMAC_MAILBOX_6;
> + adpt->rx_q[2].produce_mask = RFD2_PROD_IDX_BMSK;
> + adpt->rx_q[2].produce_shft = RFD2_PROD_IDX_SHFT;
> +
> + adpt->rx_q[2].process_reg = EMAC_MAILBOX_6;
> + adpt->rx_q[2].process_mask = RFD2_PROC_IDX_BMSK;
> + adpt->rx_q[2].process_shft = RFD2_PROC_IDX_SHFT;
> +
> + adpt->rx_q[2].consume_reg = EMAC_MAILBOX_7;
> + adpt->rx_q[2].consume_mask = RFD2_CONS_IDX_BMSK;
> + adpt->rx_q[2].consume_shft = RFD2_CONS_IDX_SHFT;
> +
> + adpt->rx_q[2].irq = &adpt->irq[2];
> + adpt->rx_q[2].intr = adpt->irq[2].mask & ISR_RX_PKT;
> +
> + /* fall through */
> + case 2:
> + adpt->rx_q[1].produce_reg = EMAC_MAILBOX_5;
> + adpt->rx_q[1].produce_mask = RFD1_PROD_IDX_BMSK;
> + adpt->rx_q[1].produce_shft = RFD1_PROD_IDX_SHFT;
> +
> + adpt->rx_q[1].process_reg = EMAC_MAILBOX_5;
> + adpt->rx_q[1].process_mask = RFD1_PROC_IDX_BMSK;
> + adpt->rx_q[1].process_shft = RFD1_PROC_IDX_SHFT;
> +
> + adpt->rx_q[1].consume_reg = EMAC_MAILBOX_7;
> + adpt->rx_q[1].consume_mask = RFD1_CONS_IDX_BMSK;
> + adpt->rx_q[1].consume_shft = RFD1_CONS_IDX_SHFT;
> +
> + adpt->rx_q[1].irq = &adpt->irq[1];
> + adpt->rx_q[1].intr = adpt->irq[1].mask & ISR_RX_PKT;
> +
> + /* fall through */
> + case 1:
> + adpt->rx_q[0].produce_reg = EMAC_MAILBOX_0;
> + adpt->rx_q[0].produce_mask = RFD0_PROD_IDX_BMSK;
> + adpt->rx_q[0].produce_shft = RFD0_PROD_IDX_SHFT;
> +
> + adpt->rx_q[0].process_reg = EMAC_MAILBOX_0;
> + adpt->rx_q[0].process_mask = RFD0_PROC_IDX_BMSK;
> + adpt->rx_q[0].process_shft = RFD0_PROC_IDX_SHFT;
> +
> + adpt->rx_q[0].consume_reg = EMAC_MAILBOX_3;
> + adpt->rx_q[0].consume_mask = RFD0_CONS_IDX_BMSK;
> + adpt->rx_q[0].consume_shft = RFD0_CONS_IDX_SHFT;
> +
> + adpt->rx_q[0].irq = &adpt->irq[0];
> + adpt->rx_q[0].intr = adpt->irq[0].mask & ISR_RX_PKT;
> + break;
> + }
> +
> + switch (adpt->tx_q_cnt) {
> + case 4:
> + adpt->tx_q[3].produce_reg = EMAC_MAILBOX_11;
> + adpt->tx_q[3].produce_mask = H3TPD_PROD_IDX_BMSK;
> + adpt->tx_q[3].produce_shft = H3TPD_PROD_IDX_SHFT;
> +
> + adpt->tx_q[3].consume_reg = EMAC_MAILBOX_12;
> + adpt->tx_q[3].consume_mask = H3TPD_CONS_IDX_BMSK;
> + adpt->tx_q[3].consume_shft = H3TPD_CONS_IDX_SHFT;
> +
> + /* fall through */
> + case 3:
> + adpt->tx_q[2].produce_reg = EMAC_MAILBOX_9;
> + adpt->tx_q[2].produce_mask = H2TPD_PROD_IDX_BMSK;
> + adpt->tx_q[2].produce_shft = H2TPD_PROD_IDX_SHFT;
> +
> + adpt->tx_q[2].consume_reg = EMAC_MAILBOX_10;
> + adpt->tx_q[2].consume_mask = H2TPD_CONS_IDX_BMSK;
> + adpt->tx_q[2].consume_shft = H2TPD_CONS_IDX_SHFT;
> +
> + /* fall through */
> + case 2:
> + adpt->tx_q[1].produce_reg = EMAC_MAILBOX_16;
> + adpt->tx_q[1].produce_mask = H1TPD_PROD_IDX_BMSK;
> + adpt->tx_q[1].produce_shft = H1TPD_PROD_IDX_SHFT;
> +
> + adpt->tx_q[1].consume_reg = EMAC_MAILBOX_10;
> + adpt->tx_q[1].consume_mask = H1TPD_CONS_IDX_BMSK;
> + adpt->tx_q[1].consume_shft = H1TPD_CONS_IDX_SHFT;
> +
> + /* fall through */
> + case 1:
> + adpt->tx_q[0].produce_reg = EMAC_MAILBOX_15;
> + adpt->tx_q[0].produce_mask = NTPD_PROD_IDX_BMSK;
> + adpt->tx_q[0].produce_shft = NTPD_PROD_IDX_SHFT;
> +
> + adpt->tx_q[0].consume_reg = EMAC_MAILBOX_2;
> + adpt->tx_q[0].consume_mask = NTPD_CONS_IDX_BMSK;
> + adpt->tx_q[0].consume_shft = NTPD_CONS_IDX_SHFT;
> + break;
> + }
> +}
> +
> +/* get the number of free transmit descriptors */
> +static u32 emac_tpd_num_free_descs(struct emac_tx_queue *tx_q)
> +{
> + u32 produce_idx = tx_q->tpd.produce_idx;
> + u32 consume_idx = tx_q->tpd.consume_idx;
> +
> + return (consume_idx > produce_idx) ?
> + (consume_idx - produce_idx - 1) :
> + (tx_q->tpd.count + consume_idx - produce_idx - 1);
> +}
> +
> +/* Check if enough transmit descriptors are available */
> +static bool emac_tx_has_enough_descs(struct emac_tx_queue *tx_q,
> + const struct sk_buff *skb)
> +{
> + u32 num_required = 1;
> + int i;
> + u16 proto_hdr_len = 0;
> +
> + if (skb_is_gso(skb)) {
> + proto_hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
> + if (proto_hdr_len < skb_headlen(skb))
> + num_required++;
> + if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
> + num_required++;
> + }
> +
> + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
> + num_required++;
> +
> + return num_required < emac_tpd_num_free_descs(tx_q);
> +}
> +
> +/* Fill up transmit descriptors with TSO and Checksum offload information */
> +static int emac_tso_csum(struct emac_adapter *adpt,
> + struct emac_tx_queue *tx_q,
> + struct sk_buff *skb,
> + struct emac_tpd *tpd)
> +{
> + u8 hdr_len;
> + int retval;
> +
> + if (skb_is_gso(skb)) {
> + if (skb_header_cloned(skb)) {
> + retval = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
> + if (unlikely(retval))
> + return retval;
> + }
> +
> + if (skb->protocol == htons(ETH_P_IP)) {
> + u32 pkt_len = ((unsigned char *)ip_hdr(skb) - skb->data)
> + + ntohs(ip_hdr(skb)->tot_len);
> + if (skb->len > pkt_len)
> + pskb_trim(skb, pkt_len);
> + }
> +
> + hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
> + if (unlikely(skb->len == hdr_len)) {
> + /* we only need to do csum */
> + netif_warn(adpt, tx_err, adpt->netdev,
> + "tso not needed for packet with 0 data\n");
> + goto do_csum;
> + }
> +
> + if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
> + ip_hdr(skb)->check = 0;
> + tcp_hdr(skb)->check = ~csum_tcpudp_magic(
> + ip_hdr(skb)->saddr,
> + ip_hdr(skb)->daddr,
> + 0, IPPROTO_TCP, 0);
> + TPD_IPV4_SET(tpd, 1);
> + }
> +
> + if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) {
> + /* ipv6 tso need an extra tpd */
> + struct emac_tpd extra_tpd;
> +
> + memset(tpd, 0, sizeof(*tpd));
> + memset(&extra_tpd, 0, sizeof(extra_tpd));
> +
> + ipv6_hdr(skb)->payload_len = 0;
> + tcp_hdr(skb)->check = ~csum_ipv6_magic(
> + &ipv6_hdr(skb)->saddr,
> + &ipv6_hdr(skb)->daddr,
> + 0, IPPROTO_TCP, 0);
> + TPD_PKT_LEN_SET(&extra_tpd, skb->len);
> + TPD_LSO_SET(&extra_tpd, 1);
> + TPD_LSOV_SET(&extra_tpd, 1);
> + emac_tx_tpd_create(adpt, tx_q, &extra_tpd);
> + TPD_LSOV_SET(tpd, 1);
> + }
> +
> + TPD_LSO_SET(tpd, 1);
> + TPD_TCPHDR_OFFSET_SET(tpd, skb_transport_offset(skb));
> + TPD_MSS_SET(tpd, skb_shinfo(skb)->gso_size);
> + return 0;
> + }
> +
> +do_csum:
> + if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
> + u8 css, cso;
> +
> + cso = skb_transport_offset(skb);
> + if (unlikely(cso & 0x1)) {
> + netdev_err(adpt->netdev,
> + "error: payload offset should be even\n");
> + return -EINVAL;
> + }
> + css = cso + skb->csum_offset;
> +
> + TPD_PAYLOAD_OFFSET_SET(tpd, cso >> 1);
> + TPD_CXSUM_OFFSET_SET(tpd, css >> 1);
> + TPD_CSX_SET(tpd, 1);
> + }
> +
> + return 0;
> +}
> +
> +/* Fill up transmit descriptors */
> +static void emac_tx_fill_tpd(struct emac_adapter *adpt,
> + struct emac_tx_queue *tx_q, struct sk_buff *skb,
> + struct emac_tpd *tpd)
> +{
> + struct emac_buffer *tpbuf = NULL;
> + u16 nr_frags = skb_shinfo(skb)->nr_frags;
> + u32 len = skb_headlen(skb);
> + u16 map_len = 0;
> + u16 mapped_len = 0;
> + u16 hdr_len = 0;
> + int i;
> +
> + /* if Large Segment Offload is (in TCP Segmentation Offload struct) */
> + if (TPD_LSO(tpd)) {
> + hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
> + map_len = hdr_len;
> +
> + tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.produce_idx);
> + tpbuf->length = map_len;
> + tpbuf->dma = dma_map_single(adpt->netdev->dev.parent, skb->data,
> + hdr_len, DMA_TO_DEVICE);
> + mapped_len += map_len;
> + TPD_BUFFER_ADDR_L_SET(tpd, EMAC_DMA_ADDR_LO(tpbuf->dma));
> + TPD_BUFFER_ADDR_H_SET(tpd, EMAC_DMA_ADDR_HI(tpbuf->dma));
> + TPD_BUF_LEN_SET(tpd, tpbuf->length);
> + emac_tx_tpd_create(adpt, tx_q, tpd);
> + }
> +
> + if (mapped_len < len) {
> + tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.produce_idx);
> + tpbuf->length = len - mapped_len;
> + tpbuf->dma = dma_map_single(adpt->netdev->dev.parent,
> + skb->data + mapped_len,
> + tpbuf->length, DMA_TO_DEVICE);
> + TPD_BUFFER_ADDR_L_SET(tpd, EMAC_DMA_ADDR_LO(tpbuf->dma));
> + TPD_BUFFER_ADDR_H_SET(tpd, EMAC_DMA_ADDR_HI(tpbuf->dma));
> + TPD_BUF_LEN_SET(tpd, tpbuf->length);
> + emac_tx_tpd_create(adpt, tx_q, tpd);
> + }
> +
> + for (i = 0; i < nr_frags; i++) {
> + struct skb_frag_struct *frag;
> +
> + frag = &skb_shinfo(skb)->frags[i];
> +
> + tpbuf = GET_TPD_BUFFER(tx_q, tx_q->tpd.produce_idx);
> + tpbuf->length = frag->size;
> + tpbuf->dma = dma_map_page(adpt->netdev->dev.parent,
> + frag->page.p, frag->page_offset,
> + tpbuf->length, DMA_TO_DEVICE);
> + TPD_BUFFER_ADDR_L_SET(tpd, EMAC_DMA_ADDR_LO(tpbuf->dma));
> + TPD_BUFFER_ADDR_H_SET(tpd, EMAC_DMA_ADDR_HI(tpbuf->dma));
> + TPD_BUF_LEN_SET(tpd, tpbuf->length);
> + emac_tx_tpd_create(adpt, tx_q, tpd);
> + }
> +
> + /* The last tpd */
> + emac_tx_tpd_mark_last(adpt, tx_q);
> +
> + if (test_bit(EMAC_STATUS_TS_TX_EN, &adpt->status) &&
> + (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
> + struct sk_buff *skb_ts = skb_clone(skb, GFP_ATOMIC);
> +
> + if (likely(skb_ts)) {
> + unsigned long flags;
> +
> + emac_tx_tpd_ts_save(adpt, tx_q);
> + skb_ts->sk = skb->sk;
> + EMAC_SKB_CB(skb_ts)->tpd_idx =
> + tx_q->tpd.last_produce_idx;
> + EMAC_SKB_CB(skb_ts)->jiffies = get_jiffies_64();
> + skb_shinfo(skb_ts)->tx_flags |= SKBTX_IN_PROGRESS;
> + spin_lock_irqsave(&adpt->tx_ts_lock, flags);
> + if (adpt->tx_ts_pending_queue.qlen >=
> + EMAC_TX_POLL_HWTXTSTAMP_THRESHOLD) {
> + emac_tx_ts_poll(adpt);
> + adpt->tx_ts_stats.tx_poll++;
> + }
> + __skb_queue_tail(&adpt->tx_ts_pending_queue,
> + skb_ts);
> + spin_unlock_irqrestore(&adpt->tx_ts_lock, flags);
> + adpt->tx_ts_stats.tx++;
> + emac_schedule_tx_ts_task(adpt);
> + }
> + }
> +
> + /* The last buffer info contain the skb address,
> + * so it will be freed after unmap
> + */
> + tpbuf->skb = skb;
> +}
> +
> +/* Transmit the packet using specified transmit queue */
> +int emac_mac_tx_buf_send(struct emac_adapter *adpt, struct emac_tx_queue *tx_q,
> + struct sk_buff *skb)
> +{
> + struct emac_tpd tpd;
> + u32 prod_idx;
> +
> + if (test_bit(EMAC_STATUS_DOWN, &adpt->status)) {
> + dev_kfree_skb_any(skb);
> + return NETDEV_TX_OK;
> + }
> +
> + if (!emac_tx_has_enough_descs(tx_q, skb)) {
> + /* not enough descriptors, just stop queue */
> + netif_stop_queue(adpt->netdev);
> + return NETDEV_TX_BUSY;
> + }
> +
> + memset(&tpd, 0, sizeof(tpd));
> +
> + if (emac_tso_csum(adpt, tx_q, skb, &tpd) != 0) {
> + dev_kfree_skb_any(skb);
> + return NETDEV_TX_OK;
> + }
> +
> + if (skb_vlan_tag_present(skb)) {
> + u16 tag;
> +
> + EMAC_VLAN_TO_TAG(skb_vlan_tag_get(skb), tag);
> + TPD_CVLAN_TAG_SET(&tpd, tag);
> + TPD_INSTC_SET(&tpd, 1);
> + }
> +
> + if (skb_network_offset(skb) != ETH_HLEN)
> + TPD_TYP_SET(&tpd, 1);
> +
> + emac_tx_fill_tpd(adpt, tx_q, skb, &tpd);
> +
> + netdev_sent_queue(adpt->netdev, skb->len);
> +
> + /* update produce idx */
> + prod_idx = (tx_q->tpd.produce_idx << tx_q->produce_shft) &
> + tx_q->produce_mask;
> + emac_reg_update32(adpt->base + tx_q->produce_reg,
> + tx_q->produce_mask, prod_idx);
> + wmb(); /* ensure that RFD producer index is flushed to HW */
> + netif_dbg(adpt, tx_queued, adpt->netdev, "TX[%d]: prod idx 0x%x\n",
> + tx_q->que_idx, tx_q->tpd.produce_idx);
> +
> + return NETDEV_TX_OK;
> +}
> diff --git a/drivers/net/ethernet/qualcomm/emac/emac-mac.h b/drivers/net/ethernet/qualcomm/emac/emac-mac.h
> new file mode 100644
> index 0000000..06afef6
> --- /dev/null
> +++ b/drivers/net/ethernet/qualcomm/emac/emac-mac.h
> @@ -0,0 +1,287 @@
> +/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +/* EMAC DMA HW engine uses three rings:
> + * Tx:
> + * TPD: Transmit Packet Descriptor ring.
> + * Rx:
> + * RFD: Receive Free Descriptor ring.
> + * Ring of descriptors with empty buffers to be filled by Rx HW.
> + * RRD: Receive Return Descriptor ring.
> + * Ring of descriptors with buffers filled with received data.
> + */
> +
> +#ifndef _EMAC_HW_H_
> +#define _EMAC_HW_H_
> +
> +/* EMAC_CSR register offsets */
> +#define EMAC_EMAC_WRAPPER_CSR1 0x000000
> +#define EMAC_EMAC_WRAPPER_CSR2 0x000004
> +#define EMAC_EMAC_WRAPPER_TX_TS_LO 0x000104
> +#define EMAC_EMAC_WRAPPER_TX_TS_HI 0x000108
> +#define EMAC_EMAC_WRAPPER_TX_TS_INX 0x00010c
> +
> +/* DMA Order Settings */
> +enum emac_dma_order {
> + emac_dma_ord_in = 1,
> + emac_dma_ord_enh = 2,
> + emac_dma_ord_out = 4
> +};
> +
> +enum emac_mac_speed {
> + emac_mac_speed_0 = 0,
> + emac_mac_speed_10_100 = 1,
> + emac_mac_speed_1000 = 2
> +};
> +
> +enum emac_dma_req_block {
> + emac_dma_req_128 = 0,
> + emac_dma_req_256 = 1,
> + emac_dma_req_512 = 2,
> + emac_dma_req_1024 = 3,
> + emac_dma_req_2048 = 4,
> + emac_dma_req_4096 = 5
> +};
> +
> +/* Returns the value of bits idx...idx+n_bits */
> +#define BITS_MASK(idx, n_bits) (((((unsigned long)1) << (n_bits)) - 1) << (idx))
> +#define BITS_GET(val, idx, n_bits) (((val) & BITS_MASK(idx, n_bits)) >> idx)
> +#define BITS_SET(val, idx, n_bits, new_val) \
> + ((val) = (((val) & (~BITS_MASK(idx, n_bits))) | \
> + (((new_val) << (idx)) & BITS_MASK(idx, n_bits))))
> +
> +/* RRD (Receive Return Descriptor) */
> +struct emac_rrd {
> + u32 word[6];
> +
> +/* number of RFD */
> +#define RRD_NOR(rrd) BITS_GET((rrd)->word[0], 16, 4)
> +/* start consumer index of rfd-ring */
> +#define RRD_SI(rrd) BITS_GET((rrd)->word[0], 20, 12)
> +/* vlan-tag (CVID, CFI and PRI) */
> +#define RRD_CVALN_TAG(rrd) BITS_GET((rrd)->word[2], 0, 16)
> +/* length of the packet */
> +#define RRD_PKT_SIZE(rrd) BITS_GET((rrd)->word[3], 0, 14)
> +/* L4(TCP/UDP) checksum failed */
> +#define RRD_L4F(rrd) BITS_GET((rrd)->word[3], 14, 1)
> +/* vlan tagged */
> +#define RRD_CVTAG(rrd) BITS_GET((rrd)->word[3], 16, 1)
> +/* When set, indicates that the descriptor is updated by the IP core.
> + * When cleared, indicates that the descriptor is invalid.
> + */
> +#define RRD_UPDT(rrd) BITS_GET((rrd)->word[3], 31, 1)
> +#define RRD_UPDT_SET(rrd, val) BITS_SET((rrd)->word[3], 31, 1, val)
> +/* timestamp low */
> +#define RRD_TS_LOW(rrd) BITS_GET((rrd)->word[4], 0, 30)
> +/* timestamp high */
> +#define RRD_TS_HI(rrd) ((rrd)->word[5])
> +};
> +
> +/* RFD (Receive Free Descriptor) */
> +union emac_rfd {
> + u64 addr;
> + u32 word[2];
> +};
> +
> +/* TPD (Transmit Packet Descriptor) */
> +struct emac_tpd {
> + u32 word[4];
> +
> +/* Number of bytes of the transmit packet. (include 4-byte CRC) */
> +#define TPD_BUF_LEN_SET(tpd, val) BITS_SET((tpd)->word[0], 0, 16, val)
> +/* Custom Checksum Offload: When set, ask IP core to offload custom checksum */
> +#define TPD_CSX_SET(tpd, val) BITS_SET((tpd)->word[1], 8, 1, val)
> +/* TCP Large Send Offload: When set, ask IP core to do offload TCP Large Send */
> +#define TPD_LSO(tpd) BITS_GET((tpd)->word[1], 12, 1)
> +#define TPD_LSO_SET(tpd, val) BITS_SET((tpd)->word[1], 12, 1, val)
> +/* Large Send Offload Version: When set, indicates this is an LSOv2
> + * (for both IPv4 and IPv6). When cleared, indicates this is an LSOv1
> + * (only for IPv4).
> + */
> +#define TPD_LSOV_SET(tpd, val) BITS_SET((tpd)->word[1], 13, 1, val)
> +/* IPv4 packet: When set, indicates this is an IPv4 packet, this bit is only
> + * for LSOV2 format.
> + */
> +#define TPD_IPV4_SET(tpd, val) BITS_SET((tpd)->word[1], 16, 1, val)
> +/* 0: Ethernet frame (DA+SA+TYPE+DATA+CRC)
> + * 1: IEEE 802.3 frame (DA+SA+LEN+DSAP+SSAP+CTL+ORG+TYPE+DATA+CRC)
> + */
> +#define TPD_TYP_SET(tpd, val) BITS_SET((tpd)->word[1], 17, 1, val)
> +/* Low-32bit Buffer Address */
> +#define TPD_BUFFER_ADDR_L_SET(tpd, val) ((tpd)->word[2] = (val))
> +/* CVLAN Tag to be inserted if INS_VLAN_TAG is set, CVLAN TPID based on global
> + * register configuration.
> + */
> +#define TPD_CVLAN_TAG_SET(tpd, val) BITS_SET((tpd)->word[3], 0, 16, val)
> +/* Insert CVlan Tag: When set, ask MAC to insert CVLAN TAG to outgoing packet
> + */
> +#define TPD_INSTC_SET(tpd, val) BITS_SET((tpd)->word[3], 17, 1, val)
> +/* High-14bit Buffer Address, So, the 64b-bit address is
> + * {DESC_CTRL_11_TX_DATA_HIADDR[17:0],(register) BUFFER_ADDR_H, BUFFER_ADDR_L}
> + */
> +#define TPD_BUFFER_ADDR_H_SET(tpd, val) BITS_SET((tpd)->word[3], 18, 13, val)
> +/* Format D. Word offset from the 1st byte of this packet to start to calculate
> + * the custom checksum.
> + */
> +#define TPD_PAYLOAD_OFFSET_SET(tpd, val) BITS_SET((tpd)->word[1], 0, 8, val)
> +/* Format D. Word offset from the 1st byte of this packet to fill the custom
> + * checksum to
> + */
> +#define TPD_CXSUM_OFFSET_SET(tpd, val) BITS_SET((tpd)->word[1], 18, 8, val)
> +
> +/* Format C. TCP Header offset from the 1st byte of this packet. (byte unit) */
> +#define TPD_TCPHDR_OFFSET_SET(tpd, val) BITS_SET((tpd)->word[1], 0, 8, val)
> +/* Format C. MSS (Maximum Segment Size) got from the protocol layer. (byte unit)
> + */
> +#define TPD_MSS_SET(tpd, val) BITS_SET((tpd)->word[1], 18, 13, val)
> +/* packet length in ext tpd */
> +#define TPD_PKT_LEN_SET(tpd, val) ((tpd)->word[2] = (val))
> +};
> +
> +/* emac_ring_header represents a single, contiguous block of DMA space
> + * mapped for the three descriptor rings (tpd, rfd, rrd)
> + */
> +struct emac_ring_header {
> + void *v_addr; /* virtual address */
> + dma_addr_t p_addr; /* physical address */
> + size_t size; /* length in bytes */
> + size_t used;
> +};
> +
> +/* emac_buffer is wrapper around a pointer to a socket buffer
> + * so a DMA handle can be stored along with the skb
> + */
> +struct emac_buffer {
> + struct sk_buff *skb; /* socket buffer */
> + u16 length; /* rx buffer length */
> + dma_addr_t dma;
> +};
> +
> +/* receive free descriptor (rfd) ring */
> +struct emac_rfd_ring {
> + struct emac_buffer *rfbuff;
> + u32 __iomem *v_addr; /* virtual address */
> + dma_addr_t p_addr; /* physical address */
> + u64 size; /* length in bytes */
> + u32 count; /* number of desc in the ring */
> + u32 produce_idx;
> + u32 process_idx;
> + u32 consume_idx; /* unused */
> +};
> +
> +/* Receive Return Desciptor (RRD) ring */
> +struct emac_rrd_ring {
> + u32 __iomem *v_addr; /* virtual address */
> + dma_addr_t p_addr; /* physical address */
> + u64 size; /* length in bytes */
> + u32 count; /* number of desc in the ring */
> + u32 produce_idx; /* unused */
> + u32 consume_idx;
> +};
> +
> +/* Rx queue */
> +struct emac_rx_queue {
> + struct net_device *netdev; /* netdev ring belongs to */
> + struct emac_rrd_ring rrd;
> + struct emac_rfd_ring rfd;
> + struct napi_struct napi;
> +
> + u16 que_idx; /* index in multi rx queues*/
> + u16 produce_reg;
> + u32 produce_mask;
> + u8 produce_shft;
> +
> + u16 process_reg;
> + u32 process_mask;
> + u8 process_shft;
> +
> + u16 consume_reg;
> + u32 consume_mask;
> + u8 consume_shft;
> +
> + u32 intr;
> + struct emac_irq *irq;
> +};
> +
> +/* Transimit Packet Descriptor (tpd) ring */
> +struct emac_tpd_ring {
> + struct emac_buffer *tpbuff;
> + u32 __iomem *v_addr; /* virtual address */
> + dma_addr_t p_addr; /* physical address */
dma_addr_t is a bus address, not a physical address. So is the type
wrong, or the comment?
> +
> + u64 size; /* length in bytes */
> + u32 count; /* number of desc in the ring */
> + u32 produce_idx;
> + u32 consume_idx;
> + u32 last_produce_idx;
> +};
> +
> +/* Tx queue */
> +struct emac_tx_queue {
> + struct emac_tpd_ring tpd;
> +
> + u16 que_idx; /* for multiqueue management */
> + u16 max_packets; /* max packets per interrupt */
> + u16 produce_reg;
> + u32 produce_mask;
> + u8 produce_shft;
> +
> + u16 consume_reg;
> + u32 consume_mask;
> + u8 consume_shft;
> +};
So this structure is not packed, since produce_mask is unaligned. Is
this supposed to match a hardware buffer? If not, can you rearrange the
fields so that they are packed?
Also, can you spell out "shift"? Dropping one letter seems silly.
> +
> +/* HW tx timestamp */
> +struct emac_tx_ts {
> + u32 ts_idx;
> + u32 sec;
> + u32 ns;
> +};
> +
> +/* Tx timestamp statistics */
> +struct emac_tx_ts_stats {
> + u32 tx;
> + u32 rx;
> + u32 deliver;
> + u32 drop;
> + u32 lost;
> + u32 timeout;
> + u32 sched;
> + u32 poll;
> + u32 tx_poll;
> +};
> +
> +struct emac_adapter;
> +
> +int emac_mac_up(struct emac_adapter *adpt);
> +void emac_mac_down(struct emac_adapter *adpt, bool reset);
> +void emac_mac_reset(struct emac_adapter *adpt);
> +void emac_mac_start(struct emac_adapter *adpt);
> +void emac_mac_stop(struct emac_adapter *adpt);
> +void emac_mac_addr_clear(struct emac_adapter *adpt, u8 *addr);
> +void emac_mac_pm(struct emac_adapter *adpt, u32 speed, bool wol_en, bool rx_en);
> +void emac_mac_mode_config(struct emac_adapter *adpt);
> +void emac_mac_wol_config(struct emac_adapter *adpt, u32 wufc);
> +void emac_mac_rx_process(struct emac_adapter *adpt, struct emac_rx_queue *rx_q,
> + int *num_pkts, int max_pkts);
> +int emac_mac_tx_buf_send(struct emac_adapter *adpt, struct emac_tx_queue *tx_q,
> + struct sk_buff *skb);
> +void emac_mac_tx_process(struct emac_adapter *adpt, struct emac_tx_queue *tx_q);
> +void emac_mac_rx_tx_ring_init_all(struct platform_device *pdev,
> + struct emac_adapter *adpt);
> +int emac_mac_rx_tx_rings_alloc_all(struct emac_adapter *adpt);
> +void emac_mac_rx_tx_rings_free_all(struct emac_adapter *adpt);
> +void emac_mac_tx_ts_periodic_routine(struct work_struct *work);
> +void emac_mac_multicast_addr_clear(struct emac_adapter *adpt);
> +void emac_mac_multicast_addr_set(struct emac_adapter *adpt, u8 *addr);
> +
> +#endif /*_EMAC_HW_H_*/
> diff --git a/drivers/net/ethernet/qualcomm/emac/emac-phy.c b/drivers/net/ethernet/qualcomm/emac/emac-phy.c
> new file mode 100644
> index 0000000..45571a5
> --- /dev/null
> +++ b/drivers/net/ethernet/qualcomm/emac/emac-phy.c
> @@ -0,0 +1,529 @@
> +/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +/* Qualcomm Technologies, Inc. EMAC PHY Controller driver.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_net.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/phy.h>
> +#include "emac.h"
> +#include "emac-mac.h"
> +#include "emac-phy.h"
> +#include "emac-sgmii.h"
> +
> +/* EMAC base register offsets */
> +#define EMAC_MDIO_CTRL 0x001414
> +#define EMAC_PHY_STS 0x001418
> +#define EMAC_MDIO_EX_CTRL 0x001440
> +
> +/* EMAC_MDIO_CTRL */
> +#define MDIO_MODE 0x40000000
> +#define MDIO_PR 0x20000000
> +#define MDIO_AP_EN 0x10000000
> +#define MDIO_BUSY 0x8000000
> +#define MDIO_CLK_SEL_BMSK 0x7000000
> +#define MDIO_CLK_SEL_SHFT 24
> +#define MDIO_START 0x800000
> +#define SUP_PREAMBLE 0x400000
> +#define MDIO_RD_NWR 0x200000
> +#define MDIO_REG_ADDR_BMSK 0x1f0000
> +#define MDIO_REG_ADDR_SHFT 16
> +#define MDIO_DATA_BMSK 0xffff
> +#define MDIO_DATA_SHFT 0
> +
> +/* EMAC_PHY_STS */
> +#define PHY_ADDR_BMSK 0x1f0000
> +#define PHY_ADDR_SHFT 16
> +
> +/* EMAC_MDIO_EX_CTRL */
> +#define DEVAD_BMSK 0x1f0000
> +#define DEVAD_SHFT 16
> +#define EX_REG_ADDR_BMSK 0xffff
> +#define EX_REG_ADDR_SHFT 0
> +
> +#define MDIO_CLK_25_4 0
> +#define MDIO_CLK_25_28 7
> +
> +#define MDIO_WAIT_TIMES 1000
> +
> +/* PHY */
> +#define MII_PSSR 0x11 /* PHY Specific Status Reg */
> +
> +/* MII_BMCR (0x00) */
> +#define BMCR_SPEED10 0x0000
> +
> +/* MII_PSSR (0x11) */
> +#define PSSR_SPD_DPLX_RESOLVED 0x0800 /* 1=Speed & Duplex resolved */
> +#define PSSR_DPLX 0x2000 /* 1=Duplex 0=Half Duplex */
> +#define PSSR_SPEED 0xC000 /* Speed, bits 14:15 */
> +#define PSSR_10MBS 0x0000 /* 00=10Mbs */
> +#define PSSR_100MBS 0x4000 /* 01=100Mbs */
> +#define PSSR_1000MBS 0x8000 /* 10=1000Mbs */
> +
> +#define EMAC_LINK_SPEED_DEFAULT (\
> + EMAC_LINK_SPEED_10_HALF |\
> + EMAC_LINK_SPEED_10_FULL |\
> + EMAC_LINK_SPEED_100_HALF |\
> + EMAC_LINK_SPEED_100_FULL |\
> + EMAC_LINK_SPEED_1GB_FULL)
> +
> +static int emac_phy_mdio_autopoll_disable(struct emac_adapter *adpt)
> +{
> + int i;
> + u32 val;
> +
> + emac_reg_update32(adpt->base + EMAC_MDIO_CTRL, MDIO_AP_EN, 0);
> + wmb(); /* ensure mdio autopoll disable is requested */
> +
> + /* wait for any mdio polling to complete */
> + for (i = 0; i < MDIO_WAIT_TIMES; i++) {
> + val = readl_relaxed(adpt->base + EMAC_MDIO_CTRL);
> + if (!(val & MDIO_BUSY))
> + return 0;
> +
> + usleep_range(100, 150);
> + }
Please use readl_poll_timeout() instead.
> +
> + /* failed to disable; ensure it is enabled before returning */
> + emac_reg_update32(adpt->base + EMAC_MDIO_CTRL, 0, MDIO_AP_EN);
> + wmb(); /* ensure mdio autopoll is enabled */
> + return -EBUSY;
> +}
> +
> +static void emac_phy_mdio_autopoll_enable(struct emac_adapter *adpt)
> +{
> + emac_reg_update32(adpt->base + EMAC_MDIO_CTRL, 0, MDIO_AP_EN);
> + wmb(); /* ensure mdio autopoll is enabled */
> +}
> +
> +int emac_phy_read_reg(struct emac_adapter *adpt, bool ext, u8 dev, bool fast,
> + u16 reg_addr, u16 *phy_data)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u32 clk_sel, val = 0;
> + int i;
> + int ret = 0;
> +
> + *phy_data = 0;
> + clk_sel = fast ? MDIO_CLK_25_4 : MDIO_CLK_25_28;
> +
> + if (phy->external) {
> + ret = emac_phy_mdio_autopoll_disable(adpt);
> + if (ret)
> + return ret;
> + }
> +
> + emac_reg_update32(adpt->base + EMAC_PHY_STS, PHY_ADDR_BMSK,
> + (dev << PHY_ADDR_SHFT));
> + wmb(); /* ensure PHY address is set before we proceed */
> +
> + if (ext) {
> + val = ((dev << DEVAD_SHFT) & DEVAD_BMSK) |
> + ((reg_addr << EX_REG_ADDR_SHFT) & EX_REG_ADDR_BMSK);
> + writel_relaxed(val, adpt->base + EMAC_MDIO_EX_CTRL);
> + wmb(); /* ensure proper address is set before proceeding */
> +
> + val = SUP_PREAMBLE |
> + ((clk_sel << MDIO_CLK_SEL_SHFT) & MDIO_CLK_SEL_BMSK) |
> + MDIO_START | MDIO_MODE | MDIO_RD_NWR;
> + } else {
> + val = val & ~(MDIO_REG_ADDR_BMSK | MDIO_CLK_SEL_BMSK |
> + MDIO_MODE | MDIO_PR);
> + val = SUP_PREAMBLE |
> + ((clk_sel << MDIO_CLK_SEL_SHFT) & MDIO_CLK_SEL_BMSK) |
> + ((reg_addr << MDIO_REG_ADDR_SHFT) & MDIO_REG_ADDR_BMSK) |
> + MDIO_START | MDIO_RD_NWR;
> + }
> +
> + writel_relaxed(val, adpt->base + EMAC_MDIO_CTRL);
> + mb(); /* ensure hw starts the operation before we check for result */
> +
> + for (i = 0; i < MDIO_WAIT_TIMES; i++) {
> + val = readl_relaxed(adpt->base + EMAC_MDIO_CTRL);
> + if (!(val & (MDIO_START | MDIO_BUSY))) {
> + *phy_data = (u16)((val >> MDIO_DATA_SHFT) &
> + MDIO_DATA_BMSK);
> + break;
> + }
> + usleep_range(100, 150);
> + }
I think you can use readl_poll_timeout() here as well, with a little
creativity.
> +
> + if (i == MDIO_WAIT_TIMES)
> + ret = -EIO;
> +
> + if (phy->external)
> + emac_phy_mdio_autopoll_enable(adpt);
> +
> + return ret;
> +}
> +
> +int emac_phy_write_reg(struct emac_adapter *adpt, bool ext, u8 dev, bool fast,
> + u16 reg_addr, u16 phy_data)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u32 clk_sel, val = 0;
> + int i;
> + int ret = 0;
> +
> + clk_sel = fast ? MDIO_CLK_25_4 : MDIO_CLK_25_28;
> +
> + if (phy->external) {
> + ret = emac_phy_mdio_autopoll_disable(adpt);
> + if (ret)
> + return ret;
> + }
> +
> + emac_reg_update32(adpt->base + EMAC_PHY_STS, PHY_ADDR_BMSK,
> + (dev << PHY_ADDR_SHFT));
> + wmb(); /* ensure PHY address is set before we proceed */
> +
> + if (ext) {
> + val = ((dev << DEVAD_SHFT) & DEVAD_BMSK) |
> + ((reg_addr << EX_REG_ADDR_SHFT) & EX_REG_ADDR_BMSK);
> + writel_relaxed(val, adpt->base + EMAC_MDIO_EX_CTRL);
> + wmb(); /* ensure proper address is set before proceeding */
> +
> + val = SUP_PREAMBLE |
> + ((clk_sel << MDIO_CLK_SEL_SHFT) & MDIO_CLK_SEL_BMSK) |
> + ((phy_data << MDIO_DATA_SHFT) & MDIO_DATA_BMSK) |
> + MDIO_START | MDIO_MODE;
> + } else {
> + val = val & ~(MDIO_REG_ADDR_BMSK | MDIO_CLK_SEL_BMSK |
> + MDIO_DATA_BMSK | MDIO_MODE | MDIO_PR);
> + val = SUP_PREAMBLE |
> + ((clk_sel << MDIO_CLK_SEL_SHFT) & MDIO_CLK_SEL_BMSK) |
> + ((reg_addr << MDIO_REG_ADDR_SHFT) & MDIO_REG_ADDR_BMSK) |
> + ((phy_data << MDIO_DATA_SHFT) & MDIO_DATA_BMSK) |
> + MDIO_START;
> + }
> +
> + writel_relaxed(val, adpt->base + EMAC_MDIO_CTRL);
> + mb(); /* ensure hw starts the operation before we check for result */
> +
> + for (i = 0; i < MDIO_WAIT_TIMES; i++) {
> + val = readl_relaxed(adpt->base + EMAC_MDIO_CTRL);
> + if (!(val & (MDIO_START | MDIO_BUSY)))
> + break;
> + usleep_range(100, 150);
> + }
Please use readl_poll_timeout() instead.
> +
> + if (i == MDIO_WAIT_TIMES)
> + ret = -EIO;
> +
> + if (phy->external)
> + emac_phy_mdio_autopoll_enable(adpt);
> +
> + return ret;
> +}
> +
> +int emac_phy_read(struct emac_adapter *adpt, u16 phy_addr, u16 reg_addr,
> + u16 *phy_data)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + int ret;
> +
> + mutex_lock(&phy->lock);
> + ret = emac_phy_read_reg(adpt, false, phy_addr, true, reg_addr,
> + phy_data);
> + mutex_unlock(&phy->lock);
> +
> + if (ret)
> + netdev_err(adpt->netdev, "error: reading phy reg 0x%02x\n",
> + reg_addr);
> + else
> + netif_dbg(adpt, hw, adpt->netdev,
> + "EMAC PHY RD: 0x%02x -> 0x%04x\n", reg_addr,
> + *phy_data);
> +
> + return ret;
> +}
> +
> +int emac_phy_write(struct emac_adapter *adpt, u16 phy_addr, u16 reg_addr,
> + u16 phy_data)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + int ret;
> +
> + mutex_lock(&phy->lock);
> + ret = emac_phy_write_reg(adpt, false, phy_addr, true, reg_addr,
> + phy_data);
> + mutex_unlock(&phy->lock);
> +
> + if (ret)
> + netdev_err(adpt->netdev, "error: writing phy reg 0x%02x\n",
> + reg_addr);
> + else
> + netif_dbg(adpt, hw,
> + adpt->netdev, "EMAC PHY WR: 0x%02x <- 0x%04x\n",
> + reg_addr, phy_data);
> +
> + return ret;
> +}
> +
> +/* initialize external phy */
> +int emac_phy_external_init(struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u16 phy_id[2];
> + int ret = 0;
> +
> + if (phy->external) {
> + ret = emac_phy_read(adpt, phy->addr, MII_PHYSID1, &phy_id[0]);
> + if (ret)
> + return ret;
> +
> + ret = emac_phy_read(adpt, phy->addr, MII_PHYSID2, &phy_id[1]);
> + if (ret)
> + return ret;
> +
> + phy->id[0] = phy_id[0];
> + phy->id[1] = phy_id[1];
> + } else {
> + emac_phy_mdio_autopoll_disable(adpt);
> + }
> +
> + return 0;
> +}
> +
> +static int emac_phy_link_setup_external(struct emac_adapter *adpt,
> + enum emac_flow_ctrl req_fc_mode,
> + u32 speed, bool autoneg, bool fc)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u16 adv, bmcr, ctrl1000 = 0;
> + int ret = 0;
> +
> + if (autoneg) {
> + switch (req_fc_mode) {
> + case EMAC_FC_FULL:
> + case EMAC_FC_RX_PAUSE:
> + adv = ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;
> + break;
> + case EMAC_FC_TX_PAUSE:
> + adv = ADVERTISE_PAUSE_ASYM;
> + break;
> + default:
> + adv = 0;
> + break;
> + }
> + if (!fc)
> + adv &= ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM);
> +
> + if (speed & EMAC_LINK_SPEED_10_HALF)
> + adv |= ADVERTISE_10HALF;
> +
> + if (speed & EMAC_LINK_SPEED_10_FULL)
> + adv |= ADVERTISE_10HALF | ADVERTISE_10FULL;
> +
> + if (speed & EMAC_LINK_SPEED_100_HALF)
> + adv |= ADVERTISE_100HALF;
> +
> + if (speed & EMAC_LINK_SPEED_100_FULL)
> + adv |= ADVERTISE_100HALF | ADVERTISE_100FULL;
> +
> + if (speed & EMAC_LINK_SPEED_1GB_FULL)
> + ctrl1000 |= ADVERTISE_1000FULL;
> +
> + ret |= emac_phy_write(adpt, phy->addr, MII_ADVERTISE, adv);
> + ret |= emac_phy_write(adpt, phy->addr, MII_CTRL1000, ctrl1000);
> +
> + bmcr = BMCR_RESET | BMCR_ANENABLE | BMCR_ANRESTART;
> + ret |= emac_phy_write(adpt, phy->addr, MII_BMCR, bmcr);
> + } else {
> + bmcr = BMCR_RESET;
> + switch (speed) {
> + case EMAC_LINK_SPEED_10_HALF:
> + bmcr |= BMCR_SPEED10;
> + break;
> + case EMAC_LINK_SPEED_10_FULL:
> + bmcr |= BMCR_SPEED10 | BMCR_FULLDPLX;
> + break;
> + case EMAC_LINK_SPEED_100_HALF:
> + bmcr |= BMCR_SPEED100;
> + break;
> + case EMAC_LINK_SPEED_100_FULL:
> + bmcr |= BMCR_SPEED100 | BMCR_FULLDPLX;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + ret |= emac_phy_write(adpt, phy->addr, MII_BMCR, bmcr);
> + }
> +
> + return ret;
> +}
> +
> +int emac_phy_link_setup(struct emac_adapter *adpt, u32 speed, bool autoneg,
> + bool fc)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + int ret = 0;
> +
> + if (!phy->external)
> + return emac_sgmii_no_ephy_link_setup(adpt, speed, autoneg);
> +
> + if (emac_phy_link_setup_external(adpt, phy->req_fc_mode, speed, autoneg,
> + fc)) {
> + netdev_err(adpt->netdev,
> + "error: on ephy setup speed:%d autoneg:%d fc:%d\n",
> + speed, autoneg, fc);
> + ret = -EINVAL;
> + } else {
> + phy->autoneg = autoneg;
> + }
> +
> + return ret;
> +}
> +
> +int emac_phy_link_check(struct emac_adapter *adpt, u32 *speed, bool *link_up)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u16 bmsr, pssr;
> + int ret;
> +
> + if (!phy->external) {
> + emac_sgmii_no_ephy_link_check(adpt, speed, link_up);
> + return 0;
> + }
> +
> + ret = emac_phy_read(adpt, phy->addr, MII_BMSR, &bmsr);
> + if (ret)
> + return ret;
> +
> + if (!(bmsr & BMSR_LSTATUS)) {
> + *link_up = false;
> + *speed = EMAC_LINK_SPEED_UNKNOWN;
> + return 0;
> + }
> + *link_up = true;
> + ret = emac_phy_read(adpt, phy->addr, MII_PSSR, &pssr);
> + if (ret)
> + return ret;
> +
> + if (!(pssr & PSSR_SPD_DPLX_RESOLVED)) {
> + netdev_err(adpt->netdev, "error: speed duplex resolved\n");
> + return -EINVAL;
> + }
> +
> + switch (pssr & PSSR_SPEED) {
> + case PSSR_1000MBS:
> + if (pssr & PSSR_DPLX)
> + *speed = EMAC_LINK_SPEED_1GB_FULL;
> + else
> + netdev_err(adpt->netdev,
> + "error: 1000M half duplex is invalid");
> + break;
> + case PSSR_100MBS:
> + if (pssr & PSSR_DPLX)
> + *speed = EMAC_LINK_SPEED_100_FULL;
> + else
> + *speed = EMAC_LINK_SPEED_100_HALF;
> + break;
> + case PSSR_10MBS:
> + if (pssr & PSSR_DPLX)
> + *speed = EMAC_LINK_SPEED_10_FULL;
> + else
> + *speed = EMAC_LINK_SPEED_10_HALF;
> + break;
> + default:
> + *speed = EMAC_LINK_SPEED_UNKNOWN;
> + ret = -EINVAL;
> + break;
> + }
> +
> + return ret;
> +}
> +
> +/* Read speed off the LPA (Link Partner Ability) register */
> +void emac_phy_link_speed_get(struct emac_adapter *adpt, u32 *speed)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + int ret;
> + u16 lpa, stat1000;
> + bool link;
> +
> + if (!phy->external) {
> + emac_sgmii_no_ephy_link_check(adpt, speed, &link);
> + return;
> + }
> +
> + ret = emac_phy_read(adpt, phy->addr, MII_LPA, &lpa);
> + ret |= emac_phy_read(adpt, phy->addr, MII_STAT1000, &stat1000);
> + if (ret)
> + return;
> +
> + *speed = EMAC_LINK_SPEED_10_HALF;
> + if (lpa & LPA_10FULL)
> + *speed = EMAC_LINK_SPEED_10_FULL;
> + else if (lpa & LPA_10HALF)
> + *speed = EMAC_LINK_SPEED_10_HALF;
> + else if (lpa & LPA_100FULL)
> + *speed = EMAC_LINK_SPEED_100_FULL;
> + else if (lpa & LPA_100HALF)
> + *speed = EMAC_LINK_SPEED_100_HALF;
> + else if (stat1000 & LPA_1000FULL)
> + *speed = EMAC_LINK_SPEED_1GB_FULL;
> +}
> +
> +/* Read phy configuration and initialize it */
> +int emac_phy_config(struct platform_device *pdev, struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + struct device_node *dt = pdev->dev.of_node;
> + int ret;
> +
> + phy->external = !of_property_read_bool(dt, "qcom,no-external-phy");
> +
> + /* get phy address on MDIO bus */
> + if (phy->external) {
> + ret = of_property_read_u32(dt, "phy-addr", &phy->addr);
> + if (ret)
> + return ret;
> + } else {
> + phy->uses_gpios = false;
> + }
> +
> + ret = emac_sgmii_config(pdev, adpt);
> + if (ret)
> + return ret;
> +
> + mutex_init(&phy->lock);
> +
> + phy->autoneg = true;
> + phy->autoneg_advertised = EMAC_LINK_SPEED_DEFAULT;
> +
> + return emac_sgmii_init(adpt);
> +}
> +
> +int emac_phy_up(struct emac_adapter *adpt)
> +{
> + return emac_sgmii_up(adpt);
> +}
> +
> +void emac_phy_down(struct emac_adapter *adpt)
> +{
> + emac_sgmii_down(adpt);
> +}
> +
> +void emac_phy_reset(struct emac_adapter *adpt)
> +{
> + emac_sgmii_reset(adpt);
> +}
> +
> +void emac_phy_periodic_check(struct emac_adapter *adpt)
> +{
> + emac_sgmii_periodic_check(adpt);
> +}
Do you really need these wrapper functions? Why not just call the emac_
functions directly?
> diff --git a/drivers/net/ethernet/qualcomm/emac/emac-phy.h b/drivers/net/ethernet/qualcomm/emac/emac-phy.h
> new file mode 100644
> index 0000000..ef16471
> --- /dev/null
> +++ b/drivers/net/ethernet/qualcomm/emac/emac-phy.h
> @@ -0,0 +1,73 @@
> +/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
> +*
> +* This program is free software; you can redistribute it and/or modify
> +* it under the terms of the GNU General Public License version 2 and
> +* only version 2 as published by the Free Software Foundation.
> +*
> +* This program is distributed in the hope that it will be useful,
> +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> +* GNU General Public License for more details.
> +*/
> +
> +#ifndef _EMAC_PHY_H_
> +#define _EMAC_PHY_H_
> +
> +enum emac_flow_ctrl {
> + EMAC_FC_NONE,
> + EMAC_FC_RX_PAUSE,
> + EMAC_FC_TX_PAUSE,
> + EMAC_FC_FULL,
> + EMAC_FC_DEFAULT
> +};
> +
> +/* emac_phy
> + * @base register file base address space.
> + * @irq phy interrupt number.
> + * @external true when external phy is used.
> + * @addr mii address.
> + * @id vendor id.
> + * @cur_fc_mode flow control mode in effect.
> + * @req_fc_mode flow control mode requested by caller.
> + * @disable_fc_autoneg Do not auto-negotiate flow control.
> + */
> +struct emac_phy {
> + void __iomem *base;
> + int irq;
> +
> + bool external;
> + bool uses_gpios;
> + u32 addr;
> + u16 id[2];
> + bool autoneg;
> + u32 autoneg_advertised;
> + u32 link_speed;
> + bool link_up;
> + /* lock - synchronize access to mdio bus */
> + struct mutex lock;
> +
> + /* flow control configuration */
> + enum emac_flow_ctrl cur_fc_mode;
> + enum emac_flow_ctrl req_fc_mode;
> + bool disable_fc_autoneg;
> +};
> +
> +struct emac_adapter;
> +struct platform_device;
> +
> +int emac_phy_read(struct emac_adapter *adpt, u16 phy_addr, u16 reg_addr,
> + u16 *phy_data);
> +int emac_phy_write(struct emac_adapter *adpt, u16 phy_addr, u16 reg_addr,
> + u16 phy_data);
> +int emac_phy_config(struct platform_device *pdev, struct emac_adapter *adpt);
> +int emac_phy_up(struct emac_adapter *adpt);
> +void emac_phy_down(struct emac_adapter *adpt);
> +void emac_phy_reset(struct emac_adapter *adpt);
> +void emac_phy_periodic_check(struct emac_adapter *adpt);
> +int emac_phy_external_init(struct emac_adapter *adpt);
> +int emac_phy_link_setup(struct emac_adapter *adpt, u32 speed, bool autoneg,
> + bool fc);
> +int emac_phy_link_check(struct emac_adapter *adpt, u32 *speed, bool *link_up);
> +void emac_phy_link_speed_get(struct emac_adapter *adpt, u32 *speed);
> +
> +#endif /* _EMAC_PHY_H_ */
> diff --git a/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
> new file mode 100644
> index 0000000..7348e21
> --- /dev/null
> +++ b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
> @@ -0,0 +1,696 @@
> +/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +/* Qualcomm Technologies, Inc. EMAC SGMII Controller driver.
> + */
> +
> +#include "emac.h"
> +#include "emac-mac.h"
> +#include "emac-sgmii.h"
> +
> +/* EMAC_QSERDES register offsets */
> +#define EMAC_QSERDES_COM_SYS_CLK_CTRL 0x000000
> +#define EMAC_QSERDES_COM_PLL_CNTRL 0x000014
> +#define EMAC_QSERDES_COM_PLL_IP_SETI 0x000018
> +#define EMAC_QSERDES_COM_PLL_CP_SETI 0x000024
> +#define EMAC_QSERDES_COM_PLL_IP_SETP 0x000028
> +#define EMAC_QSERDES_COM_PLL_CP_SETP 0x00002c
> +#define EMAC_QSERDES_COM_SYSCLK_EN_SEL 0x000038
> +#define EMAC_QSERDES_COM_RESETSM_CNTRL 0x000040
> +#define EMAC_QSERDES_COM_PLLLOCK_CMP1 0x000044
> +#define EMAC_QSERDES_COM_PLLLOCK_CMP2 0x000048
> +#define EMAC_QSERDES_COM_PLLLOCK_CMP3 0x00004c
> +#define EMAC_QSERDES_COM_PLLLOCK_CMP_EN 0x000050
> +#define EMAC_QSERDES_COM_DEC_START1 0x000064
> +#define EMAC_QSERDES_COM_DIV_FRAC_START1 0x000098
> +#define EMAC_QSERDES_COM_DIV_FRAC_START2 0x00009c
> +#define EMAC_QSERDES_COM_DIV_FRAC_START3 0x0000a0
> +#define EMAC_QSERDES_COM_DEC_START2 0x0000a4
> +#define EMAC_QSERDES_COM_PLL_CRCTRL 0x0000ac
> +#define EMAC_QSERDES_COM_RESET_SM 0x0000bc
> +#define EMAC_QSERDES_TX_BIST_MODE_LANENO 0x000100
> +#define EMAC_QSERDES_TX_TX_EMP_POST1_LVL 0x000108
> +#define EMAC_QSERDES_TX_TX_DRV_LVL 0x00010c
> +#define EMAC_QSERDES_TX_LANE_MODE 0x000150
> +#define EMAC_QSERDES_TX_TRAN_DRVR_EMP_EN 0x000170
> +#define EMAC_QSERDES_RX_CDR_CONTROL 0x000200
> +#define EMAC_QSERDES_RX_CDR_CONTROL2 0x000210
> +#define EMAC_QSERDES_RX_RX_EQ_GAIN12 0x000230
> +
> +/* EMAC_SGMII register offsets */
> +#define EMAC_SGMII_PHY_SERDES_START 0x000300
> +#define EMAC_SGMII_PHY_CMN_PWR_CTRL 0x000304
> +#define EMAC_SGMII_PHY_RX_PWR_CTRL 0x000308
> +#define EMAC_SGMII_PHY_TX_PWR_CTRL 0x00030C
> +#define EMAC_SGMII_PHY_LANE_CTRL1 0x000318
> +#define EMAC_SGMII_PHY_AUTONEG_CFG2 0x000348
> +#define EMAC_SGMII_PHY_CDR_CTRL0 0x000358
> +#define EMAC_SGMII_PHY_SPEED_CFG1 0x000374
> +#define EMAC_SGMII_PHY_POW_DWN_CTRL0 0x000380
> +#define EMAC_SGMII_PHY_RESET_CTRL 0x0003a8
> +#define EMAC_SGMII_PHY_IRQ_CMD 0x0003ac
> +#define EMAC_SGMII_PHY_INTERRUPT_CLEAR 0x0003b0
> +#define EMAC_SGMII_PHY_INTERRUPT_MASK 0x0003b4
> +#define EMAC_SGMII_PHY_INTERRUPT_STATUS 0x0003b8
> +#define EMAC_SGMII_PHY_RX_CHK_STATUS 0x0003d4
> +#define EMAC_SGMII_PHY_AUTONEG0_STATUS 0x0003e0
> +#define EMAC_SGMII_PHY_AUTONEG1_STATUS 0x0003e4
> +
> +#define SGMII_CDR_MAX_CNT 0x0f
> +
> +#define QSERDES_PLL_IPSETI 0x01
> +#define QSERDES_PLL_CP_SETI 0x3b
> +#define QSERDES_PLL_IP_SETP 0x0a
> +#define QSERDES_PLL_CP_SETP 0x09
> +#define QSERDES_PLL_CRCTRL 0xfb
> +#define QSERDES_PLL_DEC 0x02
> +#define QSERDES_PLL_DIV_FRAC_START1 0x55
> +#define QSERDES_PLL_DIV_FRAC_START2 0x2a
> +#define QSERDES_PLL_DIV_FRAC_START3 0x03
> +#define QSERDES_PLL_LOCK_CMP1 0x2b
> +#define QSERDES_PLL_LOCK_CMP2 0x68
> +#define QSERDES_PLL_LOCK_CMP3 0x00
> +
> +#define QSERDES_RX_CDR_CTRL1_THRESH 0x03
> +#define QSERDES_RX_CDR_CTRL1_GAIN 0x02
> +#define QSERDES_RX_CDR_CTRL2_THRESH 0x03
> +#define QSERDES_RX_CDR_CTRL2_GAIN 0x04
> +#define QSERDES_RX_EQ_GAIN2 0x0f
> +#define QSERDES_RX_EQ_GAIN1 0x0f
> +
> +#define QSERDES_TX_BIST_MODE_LANENO 0x00
> +#define QSERDES_TX_DRV_LVL 0x0f
> +#define QSERDES_TX_EMP_POST1_LVL 0x01
> +#define QSERDES_TX_LANE_MODE 0x08
> +
> +/* EMAC_QSERDES_COM_SYS_CLK_CTRL */
> +#define SYSCLK_CM 0x10
> +#define SYSCLK_AC_COUPLE 0x08
> +
> +/* EMAC_QSERDES_COM_PLL_CNTRL */
> +#define OCP_EN 0x20
> +#define PLL_DIV_FFEN 0x04
> +#define PLL_DIV_ORD 0x02
> +
> +/* EMAC_QSERDES_COM_SYSCLK_EN_SEL */
> +#define SYSCLK_SEL_CMOS 0x8
> +
> +/* EMAC_QSERDES_COM_RESETSM_CNTRL */
> +#define FRQ_TUNE_MODE 0x10
> +
> +/* EMAC_QSERDES_COM_PLLLOCK_CMP_EN */
> +#define PLLLOCK_CMP_EN 0x01
> +
> +/* EMAC_QSERDES_COM_DEC_START1 */
> +#define DEC_START1_MUX 0x80
> +
> +/* EMAC_QSERDES_COM_DIV_FRAC_START1 */
> +#define DIV_FRAC_START1_MUX 0x80
> +
> +/* EMAC_QSERDES_COM_DIV_FRAC_START2 */
> +#define DIV_FRAC_START2_MUX 0x80
> +
> +/* EMAC_QSERDES_COM_DIV_FRAC_START3 */
> +#define DIV_FRAC_START3_MUX 0x10
> +
> +/* EMAC_QSERDES_COM_DEC_START2 */
> +#define DEC_START2_MUX 0x2
> +#define DEC_START2 0x1
> +
> +/* EMAC_QSERDES_COM_RESET_SM */
> +#define QSERDES_READY 0x20
> +
> +/* EMAC_QSERDES_TX_TX_EMP_POST1_LVL */
> +#define TX_EMP_POST1_LVL_MUX 0x20
> +#define TX_EMP_POST1_LVL_BMSK 0x1f
> +#define TX_EMP_POST1_LVL_SHFT 0
> +
> +/* EMAC_QSERDES_TX_TX_DRV_LVL */
> +#define TX_DRV_LVL_MUX 0x10
> +#define TX_DRV_LVL_BMSK 0x0f
> +#define TX_DRV_LVL_SHFT 0
> +
> +/* EMAC_QSERDES_TX_TRAN_DRVR_EMP_EN */
> +#define EMP_EN_MUX 0x02
> +#define EMP_EN 0x01
> +
> +/* EMAC_QSERDES_RX_CDR_CONTROL & EMAC_QSERDES_RX_CDR_CONTROL2 */
> +#define SECONDORDERENABLE 0x40
> +#define FIRSTORDER_THRESH_BMSK 0x38
> +#define FIRSTORDER_THRESH_SHFT 3
> +#define SECONDORDERGAIN_BMSK 0x07
> +#define SECONDORDERGAIN_SHFT 0
> +
> +/* EMAC_QSERDES_RX_RX_EQ_GAIN12 */
> +#define RX_EQ_GAIN2_BMSK 0xf0
> +#define RX_EQ_GAIN2_SHFT 4
> +#define RX_EQ_GAIN1_BMSK 0x0f
> +#define RX_EQ_GAIN1_SHFT 0
> +
> +/* EMAC_SGMII_PHY_SERDES_START */
> +#define SERDES_START 0x01
> +
> +/* EMAC_SGMII_PHY_CMN_PWR_CTRL */
> +#define BIAS_EN 0x40
> +#define PLL_EN 0x20
> +#define SYSCLK_EN 0x10
> +#define CLKBUF_L_EN 0x08
> +#define PLL_TXCLK_EN 0x02
> +#define PLL_RXCLK_EN 0x01
> +
> +/* EMAC_SGMII_PHY_RX_PWR_CTRL */
> +#define L0_RX_SIGDET_EN 0x80
> +#define L0_RX_TERM_MODE_BMSK 0x30
> +#define L0_RX_TERM_MODE_SHFT 4
> +#define L0_RX_I_EN 0x02
> +
> +/* EMAC_SGMII_PHY_TX_PWR_CTRL */
> +#define L0_TX_EN 0x20
> +#define L0_CLKBUF_EN 0x10
> +#define L0_TRAN_BIAS_EN 0x02
> +
> +/* EMAC_SGMII_PHY_LANE_CTRL1 */
> +#define L0_RX_EQ_EN 0x40
> +#define L0_RESET_TSYNC_EN 0x10
> +#define L0_DRV_LVL_BMSK 0x0f
> +#define L0_DRV_LVL_SHFT 0
> +
> +/* EMAC_SGMII_PHY_AUTONEG_CFG2 */
> +#define FORCE_AN_TX_CFG 0x20
> +#define FORCE_AN_RX_CFG 0x10
> +#define AN_ENABLE 0x01
> +
> +/* EMAC_SGMII_PHY_SPEED_CFG1 */
> +#define DUPLEX_MODE 0x10
> +#define SPDMODE_1000 0x02
> +#define SPDMODE_100 0x01
> +#define SPDMODE_10 0x00
> +#define SPDMODE_BMSK 0x03
> +#define SPDMODE_SHFT 0
> +
> +/* EMAC_SGMII_PHY_POW_DWN_CTRL0 */
> +#define PWRDN_B 0x01
> +
> +/* EMAC_SGMII_PHY_RESET_CTRL */
> +#define PHY_SW_RESET 0x01
> +
> +/* EMAC_SGMII_PHY_IRQ_CMD */
> +#define IRQ_GLOBAL_CLEAR 0x01
> +
> +/* EMAC_SGMII_PHY_INTERRUPT_MASK */
> +#define DECODE_CODE_ERR 0x80
> +#define DECODE_DISP_ERR 0x40
> +#define PLL_UNLOCK 0x20
> +#define AN_ILLEGAL_TERM 0x10
> +#define SYNC_FAIL 0x08
> +#define AN_START 0x04
> +#define AN_END 0x02
> +#define AN_REQUEST 0x01
> +
> +#define SGMII_PHY_IRQ_CLR_WAIT_TIME 10
> +
> +#define SGMII_PHY_INTERRUPT_ERR (\
> + DECODE_CODE_ERR |\
> + DECODE_DISP_ERR)
> +
> +#define SGMII_ISR_AN_MASK (\
> + AN_REQUEST |\
> + AN_START |\
> + AN_END |\
> + AN_ILLEGAL_TERM |\
> + PLL_UNLOCK |\
> + SYNC_FAIL)
> +
> +#define SGMII_ISR_MASK (\
> + SGMII_PHY_INTERRUPT_ERR |\
> + SGMII_ISR_AN_MASK)
> +
> +/* SGMII TX_CONFIG */
> +#define TXCFG_LINK 0x8000
> +#define TXCFG_MODE_BMSK 0x1c00
> +#define TXCFG_1000_FULL 0x1800
> +#define TXCFG_100_FULL 0x1400
> +#define TXCFG_100_HALF 0x0400
> +#define TXCFG_10_FULL 0x1000
> +#define TXCFG_10_HALF 0x0000
> +
> +#define SERDES_START_WAIT_TIMES 100
> +
> +struct emac_reg_write {
> + ulong offset;
> +#define END_MARKER 0xffffffff
> + u32 val;
> +};
> +
> +static void emac_reg_write_all(void __iomem *base,
> + const struct emac_reg_write *itr, size_t size)
> +{
> + size_t i;
> +
> + for (i = 0; i < size; ++itr, ++i)
> + writel_relaxed(itr->val, base + itr->offset);
> +}
> +
> +static const struct emac_reg_write physical_coding_sublayer_programming[] = {
> +{EMAC_SGMII_PHY_CDR_CTRL0, SGMII_CDR_MAX_CNT},
> +{EMAC_SGMII_PHY_POW_DWN_CTRL0, PWRDN_B},
> +{EMAC_SGMII_PHY_CMN_PWR_CTRL, BIAS_EN | SYSCLK_EN | CLKBUF_L_EN |
> + PLL_TXCLK_EN | PLL_RXCLK_EN},
> +{EMAC_SGMII_PHY_TX_PWR_CTRL, L0_TX_EN | L0_CLKBUF_EN | L0_TRAN_BIAS_EN},
> +{EMAC_SGMII_PHY_RX_PWR_CTRL, L0_RX_SIGDET_EN | (1 << L0_RX_TERM_MODE_SHFT) |
> + L0_RX_I_EN},
> +{EMAC_SGMII_PHY_CMN_PWR_CTRL, BIAS_EN | PLL_EN | SYSCLK_EN | CLKBUF_L_EN |
> + PLL_TXCLK_EN | PLL_RXCLK_EN},
> +{EMAC_SGMII_PHY_LANE_CTRL1, L0_RX_EQ_EN | L0_RESET_TSYNC_EN |
> + L0_DRV_LVL_BMSK},
> +};
> +
> +static const struct emac_reg_write sysclk_refclk_setting[] = {
> +{EMAC_QSERDES_COM_SYSCLK_EN_SEL, SYSCLK_SEL_CMOS},
> +{EMAC_QSERDES_COM_SYS_CLK_CTRL, SYSCLK_CM | SYSCLK_AC_COUPLE},
> +};
> +
> +static const struct emac_reg_write pll_setting[] = {
> +{EMAC_QSERDES_COM_PLL_IP_SETI, QSERDES_PLL_IPSETI},
> +{EMAC_QSERDES_COM_PLL_CP_SETI, QSERDES_PLL_CP_SETI},
> +{EMAC_QSERDES_COM_PLL_IP_SETP, QSERDES_PLL_IP_SETP},
> +{EMAC_QSERDES_COM_PLL_CP_SETP, QSERDES_PLL_CP_SETP},
> +{EMAC_QSERDES_COM_PLL_CRCTRL, QSERDES_PLL_CRCTRL},
> +{EMAC_QSERDES_COM_PLL_CNTRL, OCP_EN | PLL_DIV_FFEN | PLL_DIV_ORD},
> +{EMAC_QSERDES_COM_DEC_START1, DEC_START1_MUX | QSERDES_PLL_DEC},
> +{EMAC_QSERDES_COM_DEC_START2, DEC_START2_MUX | DEC_START2},
> +{EMAC_QSERDES_COM_DIV_FRAC_START1, DIV_FRAC_START1_MUX |
> + QSERDES_PLL_DIV_FRAC_START1},
> +{EMAC_QSERDES_COM_DIV_FRAC_START2, DIV_FRAC_START2_MUX |
> + QSERDES_PLL_DIV_FRAC_START2},
> +{EMAC_QSERDES_COM_DIV_FRAC_START3, DIV_FRAC_START3_MUX |
> + QSERDES_PLL_DIV_FRAC_START3},
> +{EMAC_QSERDES_COM_PLLLOCK_CMP1, QSERDES_PLL_LOCK_CMP1},
> +{EMAC_QSERDES_COM_PLLLOCK_CMP2, QSERDES_PLL_LOCK_CMP2},
> +{EMAC_QSERDES_COM_PLLLOCK_CMP3, QSERDES_PLL_LOCK_CMP3},
> +{EMAC_QSERDES_COM_PLLLOCK_CMP_EN, PLLLOCK_CMP_EN},
> +{EMAC_QSERDES_COM_RESETSM_CNTRL, FRQ_TUNE_MODE},
> +};
> +
> +static const struct emac_reg_write cdr_setting[] = {
> +{EMAC_QSERDES_RX_CDR_CONTROL, SECONDORDERENABLE |
> + (QSERDES_RX_CDR_CTRL1_THRESH << FIRSTORDER_THRESH_SHFT) |
> + (QSERDES_RX_CDR_CTRL1_GAIN << SECONDORDERGAIN_SHFT)},
> +{EMAC_QSERDES_RX_CDR_CONTROL2, SECONDORDERENABLE |
> + (QSERDES_RX_CDR_CTRL2_THRESH << FIRSTORDER_THRESH_SHFT) |
> + (QSERDES_RX_CDR_CTRL2_GAIN << SECONDORDERGAIN_SHFT)},
> +};
> +
> +static const struct emac_reg_write tx_rx_setting[] = {
> +{EMAC_QSERDES_TX_BIST_MODE_LANENO, QSERDES_TX_BIST_MODE_LANENO},
> +{EMAC_QSERDES_TX_TX_DRV_LVL, TX_DRV_LVL_MUX |
> + (QSERDES_TX_DRV_LVL << TX_DRV_LVL_SHFT)},
> +{EMAC_QSERDES_TX_TRAN_DRVR_EMP_EN, EMP_EN_MUX | EMP_EN},
> +{EMAC_QSERDES_TX_TX_EMP_POST1_LVL, TX_EMP_POST1_LVL_MUX |
> + (QSERDES_TX_EMP_POST1_LVL << TX_EMP_POST1_LVL_SHFT)},
> +{EMAC_QSERDES_RX_RX_EQ_GAIN12,
> + (QSERDES_RX_EQ_GAIN2 << RX_EQ_GAIN2_SHFT) |
> + (QSERDES_RX_EQ_GAIN1 << RX_EQ_GAIN1_SHFT)},
> +{EMAC_QSERDES_TX_LANE_MODE, QSERDES_TX_LANE_MODE},
> +};
> +
> +int emac_sgmii_link_init(struct emac_adapter *adpt, u32 speed, bool autoneg,
> + bool fc)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u32 val;
> + u32 speed_cfg = 0;
> +
> + val = readl_relaxed(phy->base + EMAC_SGMII_PHY_AUTONEG_CFG2);
> +
> + if (autoneg) {
> + val &= ~(FORCE_AN_RX_CFG | FORCE_AN_TX_CFG);
> + val |= AN_ENABLE;
> + writel_relaxed(val, phy->base + EMAC_SGMII_PHY_AUTONEG_CFG2);
> + } else {
> + switch (speed) {
> + case EMAC_LINK_SPEED_10_HALF:
> + speed_cfg = SPDMODE_10;
> + break;
> + case EMAC_LINK_SPEED_10_FULL:
> + speed_cfg = SPDMODE_10 | DUPLEX_MODE;
> + break;
> + case EMAC_LINK_SPEED_100_HALF:
> + speed_cfg = SPDMODE_100;
> + break;
> + case EMAC_LINK_SPEED_100_FULL:
> + speed_cfg = SPDMODE_100 | DUPLEX_MODE;
> + break;
> + case EMAC_LINK_SPEED_1GB_FULL:
> + speed_cfg = SPDMODE_1000 | DUPLEX_MODE;
> + break;
> + default:
> + return -EINVAL;
> + }
> + val &= ~AN_ENABLE;
> + writel_relaxed(speed_cfg,
> + phy->base + EMAC_SGMII_PHY_SPEED_CFG1);
> + writel_relaxed(val, phy->base + EMAC_SGMII_PHY_AUTONEG_CFG2);
> + }
> + /* Ensure Auto-Neg setting are written to HW before leaving */
> + wmb();
> +
> + return 0;
> +}
> +
> +int emac_sgmii_irq_clear(struct emac_adapter *adpt, u32 irq_bits)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u32 status;
> + int i;
> +
> + writel_relaxed(irq_bits, phy->base + EMAC_SGMII_PHY_INTERRUPT_CLEAR);
> + writel_relaxed(IRQ_GLOBAL_CLEAR, phy->base + EMAC_SGMII_PHY_IRQ_CMD);
> + /* Ensure interrupt clear command is written to HW */
> + wmb();
> +
> + /* After set the IRQ_GLOBAL_CLEAR bit, the status clearing must
> + * be confirmed before clearing the bits in other registers.
> + * It takes a few cycles for hw to clear the interrupt status.
> + */
> + for (i = 0; i < SGMII_PHY_IRQ_CLR_WAIT_TIME; i++) {
> + udelay(1);
> + status = readl_relaxed(phy->base +
> + EMAC_SGMII_PHY_INTERRUPT_STATUS);
> + if (!(status & irq_bits))
> + break;
> + }
Please use readl_poll_timeout() instead.
> + if (status & irq_bits) {
> + netdev_err(adpt->netdev,
> + "error: failed clear SGMII irq: status:0x%x bits:0x%x\n",
> + status, irq_bits);
> + return -EIO;
> + }
> +
> + /* Finalize clearing procedure */
> + writel_relaxed(0, phy->base + EMAC_SGMII_PHY_IRQ_CMD);
> + writel_relaxed(0, phy->base + EMAC_SGMII_PHY_INTERRUPT_CLEAR);
> + /* Ensure that clearing procedure finalization is written to HW */
> + wmb();
> +
> + return 0;
> +}
> +
> +int emac_sgmii_init(struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + int i;
> + int ret;
> +
> + ret = emac_sgmii_link_init(adpt, phy->autoneg_advertised, phy->autoneg,
> + !phy->disable_fc_autoneg);
> + if (ret)
> + return ret;
> +
> + emac_reg_write_all(phy->base, physical_coding_sublayer_programming,
> + ARRAY_SIZE(physical_coding_sublayer_programming));
> +
> + /* Ensure Rx/Tx lanes power configuration is written to hw before
> + * configuring the SerDes engine's clocks
> + */
> + wmb();
> +
> + emac_reg_write_all(phy->base, sysclk_refclk_setting,
> + ARRAY_SIZE(sysclk_refclk_setting));
> + emac_reg_write_all(phy->base, pll_setting, ARRAY_SIZE(pll_setting));
> + emac_reg_write_all(phy->base, cdr_setting, ARRAY_SIZE(cdr_setting));
> + emac_reg_write_all(phy->base, tx_rx_setting,
> + ARRAY_SIZE(tx_rx_setting));
> +
> + /* Ensure SerDes engine configuration is written to hw before powering
> + * it up
> + */
> + wmb();
> +
> + writel_relaxed(SERDES_START, phy->base + EMAC_SGMII_PHY_SERDES_START);
> +
> + /* Ensure Rx/Tx SerDes engine power-up command is written to HW */
> + wmb();
> +
> + for (i = 0; i < SERDES_START_WAIT_TIMES; i++) {
> + if (readl_relaxed(phy->base + EMAC_QSERDES_COM_RESET_SM) &
> + QSERDES_READY)
> + break;
> + usleep_range(100, 200);
> + }
Please use readl_poll_timeout() instead.
> +
> + if (i == SERDES_START_WAIT_TIMES) {
> + netdev_err(adpt->netdev, "error: ser/des failed to start\n");
> + return -EIO;
> + }
> + /* Mask out all the SGMII Interrupt */
> + writel_relaxed(0, phy->base + EMAC_SGMII_PHY_INTERRUPT_MASK);
> + /* Ensure SGMII interrupts are masked out before clearing them */
> + wmb();
> +
> + emac_sgmii_irq_clear(adpt, SGMII_PHY_INTERRUPT_ERR);
> +
> + return 0;
> +}
> +
> +void emac_sgmii_reset_prepare(struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u32 val;
> +
> + val = readl_relaxed(phy->base + EMAC_EMAC_WRAPPER_CSR2);
> + writel_relaxed(((val & ~PHY_RESET) | PHY_RESET),
> + phy->base + EMAC_EMAC_WRAPPER_CSR2);
> + /* Ensure phy-reset command is written to HW before the release cmd */
> + wmb();
> + msleep(50);
> + val = readl_relaxed(phy->base + EMAC_EMAC_WRAPPER_CSR2);
> + writel_relaxed((val & ~PHY_RESET),
> + phy->base + EMAC_EMAC_WRAPPER_CSR2);
> + /* Ensure phy-reset release command is written to HW before initializing
> + * SGMII
> + */
> + wmb();
> + msleep(50);
> +}
> +
> +void emac_sgmii_reset(struct emac_adapter *adpt)
> +{
> + clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], EMC_CLK_RATE_19_2MHZ);
> + emac_sgmii_reset_prepare(adpt);
> + emac_sgmii_init(adpt);
> + clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], EMC_CLK_RATE_125MHZ);
> +}
> +
> +int emac_sgmii_no_ephy_link_setup(struct emac_adapter *adpt, u32 speed,
> + bool autoneg)
> +{
> + struct emac_phy *phy = &adpt->phy;
> +
> + phy->autoneg = autoneg;
> + phy->autoneg_advertised = speed;
> + /* The AN_ENABLE and SPEED_CFG can't change on fly. The SGMII_PHY has
> + * to be re-initialized.
> + */
> + emac_sgmii_reset_prepare(adpt);
> + return emac_sgmii_init(adpt);
In general, there should be a blank line above "return" statements.
Please fix everywhere.
> +}
> +
> +int emac_sgmii_config(struct platform_device *pdev, struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + struct resource *res;
> + int ret;
> +
> + ret = platform_get_irq_byname(pdev, "sgmii_irq");
> + if (ret < 0)
> + return ret;
> +
> + phy->irq = ret;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sgmii");
> + if (!res) {
> + netdev_err(adpt->netdev, "error: missing 'sgmii' resource\n");
> + return -ENXIO;
> + }
> +
> + phy->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(phy->base))
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +void emac_sgmii_autoneg_check(struct emac_adapter *adpt, u32 *speed,
> + bool *link_up)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u32 autoneg0, autoneg1, status;
> +
> + autoneg0 = readl_relaxed(phy->base + EMAC_SGMII_PHY_AUTONEG0_STATUS);
> + autoneg1 = readl_relaxed(phy->base + EMAC_SGMII_PHY_AUTONEG1_STATUS);
> + status = ((autoneg1 & 0xff) << 8) | (autoneg0 & 0xff);
> +
> + if (!(status & TXCFG_LINK)) {
> + *link_up = false;
> + *speed = EMAC_LINK_SPEED_UNKNOWN;
> + return;
> + }
> +
> + *link_up = true;
> +
> + switch (status & TXCFG_MODE_BMSK) {
> + case TXCFG_1000_FULL:
> + *speed = EMAC_LINK_SPEED_1GB_FULL;
> + break;
> + case TXCFG_100_FULL:
> + *speed = EMAC_LINK_SPEED_100_FULL;
> + break;
> + case TXCFG_100_HALF:
> + *speed = EMAC_LINK_SPEED_100_HALF;
> + break;
> + case TXCFG_10_FULL:
> + *speed = EMAC_LINK_SPEED_10_FULL;
> + break;
> + case TXCFG_10_HALF:
> + *speed = EMAC_LINK_SPEED_10_HALF;
> + break;
> + default:
> + *speed = EMAC_LINK_SPEED_UNKNOWN;
> + break;
> + }
> +}
> +
> +void emac_sgmii_no_ephy_link_check(struct emac_adapter *adpt, u32 *speed,
> + bool *link_up)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + u32 val;
> +
> + val = readl_relaxed(phy->base + EMAC_SGMII_PHY_AUTONEG_CFG2);
> + if (val & AN_ENABLE) {
> + emac_sgmii_autoneg_check(adpt, speed, link_up);
> + return;
> + }
> +
> + val = readl_relaxed(phy->base + EMAC_SGMII_PHY_SPEED_CFG1);
> + val &= DUPLEX_MODE | SPDMODE_BMSK;
> + switch (val) {
switch (val & (DUPLEX_MODE | SPDMODE_BMSK)) {
is cleaner
> + case DUPLEX_MODE | SPDMODE_1000:
> + *speed = EMAC_LINK_SPEED_1GB_FULL;
> + break;
> + case DUPLEX_MODE | SPDMODE_100:
> + *speed = EMAC_LINK_SPEED_100_FULL;
> + break;
> + case SPDMODE_100:
> + *speed = EMAC_LINK_SPEED_100_HALF;
> + break;
> + case DUPLEX_MODE | SPDMODE_10:
> + *speed = EMAC_LINK_SPEED_10_FULL;
> + break;
> + case SPDMODE_10:
> + *speed = EMAC_LINK_SPEED_10_HALF;
> + break;
> + default:
> + *speed = EMAC_LINK_SPEED_UNKNOWN;
> + break;
> + }
> + *link_up = true;
> +}
> +
> +irqreturn_t emac_sgmii_isr(int _irq, void *data)
> +{
> + struct emac_adapter *adpt = data;
> + struct emac_phy *phy = &adpt->phy;
> + u32 status;
> +
> + netif_dbg(adpt, intr, adpt->netdev, "receive sgmii interrupt\n");
> +
> + do {
> + status = readl_relaxed(phy->base +
> + EMAC_SGMII_PHY_INTERRUPT_STATUS) &
> + SGMII_ISR_MASK;
> + if (!status)
> + break;
> +
> + if (status & SGMII_PHY_INTERRUPT_ERR) {
> + set_bit(EMAC_STATUS_TASK_CHK_SGMII_REQ, &adpt->status);
> + if (!test_bit(EMAC_STATUS_DOWN, &adpt->status))
> + emac_work_thread_reschedule(adpt);
> + }
> +
> + if (status & SGMII_ISR_AN_MASK)
> + emac_lsc_schedule_check(adpt);
> +
> + if (emac_sgmii_irq_clear(adpt, status) != 0) {
> + /* reset */
> + set_bit(EMAC_STATUS_TASK_REINIT_REQ, &adpt->status);
> + emac_work_thread_reschedule(adpt);
> + break;
> + }
> + } while (1);
> +
> + return IRQ_HANDLED;
> +}
> +
> +int emac_sgmii_up(struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + int ret;
> +
> + ret = request_irq(phy->irq, emac_sgmii_isr, IRQF_TRIGGER_RISING,
> + "sgmii_irq", adpt);
> + if (ret)
> + netdev_err(adpt->netdev,
> + "error:%d on request_irq(%d:sgmii_irq)\n", ret,
> + phy->irq);
> +
> + /* enable sgmii irq */
> + writel_relaxed(SGMII_ISR_MASK,
> + phy->base + EMAC_SGMII_PHY_INTERRUPT_MASK);
> +
> + return ret;
> +}
> +
> +void emac_sgmii_down(struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> +
> + writel_relaxed(0, phy->base + EMAC_SGMII_PHY_INTERRUPT_MASK);
> + synchronize_irq(phy->irq);
> + free_irq(phy->irq, adpt);
> +}
> +
> +/* Check SGMII for error */
> +void emac_sgmii_periodic_check(struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> +
> + if (!test_bit(EMAC_STATUS_TASK_CHK_SGMII_REQ, &adpt->status))
> + return;
> + clear_bit(EMAC_STATUS_TASK_CHK_SGMII_REQ, &adpt->status);
> +
> + /* ensure that no reset is in progress while link task is running */
> + while (test_and_set_bit(EMAC_STATUS_RESETTING, &adpt->status))
> + msleep(20); /* Reset might take few 10s of ms */
> +
> + if (test_bit(EMAC_STATUS_DOWN, &adpt->status))
> + goto sgmii_task_done;
> +
> + if (readl_relaxed(phy->base + EMAC_SGMII_PHY_RX_CHK_STATUS) & 0x40)
> + goto sgmii_task_done;
> +
> + netdev_err(adpt->netdev, "error: SGMII CDR not locked\n");
> +
> +sgmii_task_done:
> + clear_bit(EMAC_STATUS_RESETTING, &adpt->status);
> +}
> diff --git a/drivers/net/ethernet/qualcomm/emac/emac-sgmii.h b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.h
> new file mode 100644
> index 0000000..4d55915b
> --- /dev/null
> +++ b/drivers/net/ethernet/qualcomm/emac/emac-sgmii.h
> @@ -0,0 +1,30 @@
> +/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _EMAC_SGMII_H_
> +#define _EMAC_SGMII_H_
> +
> +struct emac_adapter;
> +struct platform_device;
> +
> +int emac_sgmii_init(struct emac_adapter *adpt);
> +int emac_sgmii_config(struct platform_device *pdev, struct emac_adapter *adpt);
> +void emac_sgmii_reset(struct emac_adapter *adpt);
> +int emac_sgmii_up(struct emac_adapter *adpt);
> +void emac_sgmii_down(struct emac_adapter *adpt);
> +void emac_sgmii_periodic_check(struct emac_adapter *adpt);
> +int emac_sgmii_no_ephy_link_setup(struct emac_adapter *adpt, u32 speed,
> + bool autoneg);
> +void emac_sgmii_no_ephy_link_check(struct emac_adapter *adpt, u32 *speed,
> + bool *link_up);
> +
> +#endif /*_EMAC_SGMII_H_*/
> diff --git a/drivers/net/ethernet/qualcomm/emac/emac.c b/drivers/net/ethernet/qualcomm/emac/emac.c
> new file mode 100644
> index 0000000..fcf8784
> --- /dev/null
> +++ b/drivers/net/ethernet/qualcomm/emac/emac.c
> @@ -0,0 +1,1322 @@
> +/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +/* Qualcomm Technologies, Inc. EMAC Gigabit Ethernet Driver
> + * The EMAC driver supports following features:
> + * 1) Receive Side Scaling (RSS).
> + * 2) Checksum offload.
> + * 3) Multiple PHY support on MDIO bus.
> + * 4) Runtime power management support.
> + * 5) Interrupt coalescing support.
> + * 6) SGMII phy.
> + * 7) SGMII direct connection (without external phy).
> + */
> +
> +#include <linux/if_ether.h>
> +#include <linux/if_vlan.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_net.h>
> +#include <linux/of_gpio.h>
> +#include <linux/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include "emac.h"
> +#include "emac-mac.h"
> +#include "emac-phy.h"
> +
> +#define DRV_VERSION "1.1.0.0"
> +
> +static int debug = -1;
> +module_param(debug, int, S_IRUGO | S_IWUSR | S_IWGRP);
> +
> +static int emac_irq_use_extended;
> +module_param(emac_irq_use_extended, int, S_IRUGO | S_IWUSR | S_IWGRP);
> +
> +const char emac_drv_name[] = "qcom-emac";
> +const char emac_drv_description[] =
> + "Qualcomm Technologies, Inc. EMAC Ethernet Driver";
> +const char emac_drv_version[] = DRV_VERSION;
> +
> +#define EMAC_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK | \
> + NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP | \
> + NETIF_MSG_RX_ERR | NETIF_MSG_TX_ERR | NETIF_MSG_TX_QUEUED | \
> + NETIF_MSG_INTR | NETIF_MSG_TX_DONE | NETIF_MSG_RX_STATUS | \
> + NETIF_MSG_PKTDATA | NETIF_MSG_HW | NETIF_MSG_WOL)
> +
> +#define EMAC_RRD_SIZE 4
> +#define EMAC_TS_RRD_SIZE 6
> +#define EMAC_TPD_SIZE 4
> +#define EMAC_RFD_SIZE 2
> +
> +#define REG_MAC_RX_STATUS_BIN EMAC_RXMAC_STATC_REG0
> +#define REG_MAC_RX_STATUS_END EMAC_RXMAC_STATC_REG22
> +#define REG_MAC_TX_STATUS_BIN EMAC_TXMAC_STATC_REG0
> +#define REG_MAC_TX_STATUS_END EMAC_TXMAC_STATC_REG24
> +
> +#define RXQ0_NUM_RFD_PREF_DEF 8
> +#define TXQ0_NUM_TPD_PREF_DEF 5
> +
> +#define EMAC_PREAMBLE_DEF 7
> +
> +#define DMAR_DLY_CNT_DEF 15
> +#define DMAW_DLY_CNT_DEF 4
> +
> +#define IMR_NORMAL_MASK (\
> + ISR_ERROR |\
> + ISR_GPHY_LINK |\
> + ISR_TX_PKT |\
> + GPHY_WAKEUP_INT)
> +
> +#define IMR_EXTENDED_MASK (\
> + SW_MAN_INT |\
> + ISR_OVER |\
> + ISR_ERROR |\
> + ISR_GPHY_LINK |\
> + ISR_TX_PKT |\
> + GPHY_WAKEUP_INT)
> +
> +#define ISR_TX_PKT (\
> + TX_PKT_INT |\
> + TX_PKT_INT1 |\
> + TX_PKT_INT2 |\
> + TX_PKT_INT3)
> +
> +#define ISR_GPHY_LINK (\
> + GPHY_LINK_UP_INT |\
> + GPHY_LINK_DOWN_INT)
> +
> +#define ISR_OVER (\
> + RFD0_UR_INT |\
> + RFD1_UR_INT |\
> + RFD2_UR_INT |\
> + RFD3_UR_INT |\
> + RFD4_UR_INT |\
> + RXF_OF_INT |\
> + TXF_UR_INT)
> +
> +#define ISR_ERROR (\
> + DMAR_TO_INT |\
> + DMAW_TO_INT |\
> + TXQ_TO_INT)
> +
> +static irqreturn_t emac_isr(int irq, void *data);
> +static irqreturn_t emac_wol_isr(int irq, void *data);
> +
> +/* RSS SW woraround:
> + * EMAC HW has an issue with interrupt assignment because of which receive queue
> + * 1 is disabled and following receive rss queue to interrupt mapping is used:
> + * rss-queue intr
> + * 0 core0
> + * 1 core3 (disabled)
> + * 2 core1
> + * 3 core2
> + */
> +const struct emac_irq_config emac_irq_cfg_tbl[EMAC_IRQ_CNT] = {
> +{ "core0_irq", emac_isr, EMAC_INT_STATUS, EMAC_INT_MASK, RX_PKT_INT0, 0},
> +{ "core3_irq", emac_isr, EMAC_INT3_STATUS, EMAC_INT3_MASK, 0, 0},
> +{ "core1_irq", emac_isr, EMAC_INT1_STATUS, EMAC_INT1_MASK, RX_PKT_INT2, 0},
> +{ "core2_irq", emac_isr, EMAC_INT2_STATUS, EMAC_INT2_MASK, RX_PKT_INT3, 0},
> +{ "wol_irq", emac_wol_isr, 0, 0, 0, 0},
> +};
> +
> +const char * const emac_gpio_name[] = {
> + "qcom,emac-gpio-mdc", "qcom,emac-gpio-mdio"
> +};
> +
> +/* in sync with enum emac_clk_id */
> +static const char * const emac_clk_name[] = {
> + "axi_clk", "cfg_ahb_clk", "high_speed_clk", "mdio_clk", "tx_clk",
> + "rx_clk", "sys_clk"
> +};
> +
> +void emac_reg_update32(void __iomem *addr, u32 mask, u32 val)
> +{
> + u32 data = readl_relaxed(addr);
> +
> + writel_relaxed(((data & ~mask) | val), addr);
> +}
> +
> +/* reinitialize */
> +void emac_reinit_locked(struct emac_adapter *adpt)
> +{
> + WARN_ON(in_interrupt());
> +
> + while (test_and_set_bit(EMAC_STATUS_RESETTING, &adpt->status))
> + msleep(20); /* Reset might take few 10s of ms */
> +
> + if (test_bit(EMAC_STATUS_DOWN, &adpt->status)) {
> + clear_bit(EMAC_STATUS_RESETTING, &adpt->status);
> + return;
> + }
> +
> + emac_mac_down(adpt, true);
> +
> + emac_phy_reset(adpt);
> + emac_mac_up(adpt);
> +
> + clear_bit(EMAC_STATUS_RESETTING, &adpt->status);
> +}
> +
> +void emac_work_thread_reschedule(struct emac_adapter *adpt)
> +{
> + if (!test_bit(EMAC_STATUS_DOWN, &adpt->status) &&
> + !test_bit(EMAC_STATUS_WATCH_DOG, &adpt->status)) {
> + set_bit(EMAC_STATUS_WATCH_DOG, &adpt->status);
> + schedule_work(&adpt->work_thread);
> + }
> +}
> +
> +void emac_lsc_schedule_check(struct emac_adapter *adpt)
> +{
> + set_bit(EMAC_STATUS_TASK_LSC_REQ, &adpt->status);
> + adpt->link_chk_timeout = jiffies + EMAC_TRY_LINK_TIMEOUT;
> +
> + if (!test_bit(EMAC_STATUS_DOWN, &adpt->status))
> + emac_work_thread_reschedule(adpt);
> +}
> +
> +/* Change MAC address */
> +static int emac_set_mac_address(struct net_device *netdev, void *p)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> +
> + struct sockaddr *addr = p;
> +
> + if (!is_valid_ether_addr(addr->sa_data))
> + return -EADDRNOTAVAIL;
> +
> + if (netif_running(netdev))
> + return -EBUSY;
> +
> + memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
> + memcpy(adpt->mac_addr, addr->sa_data, netdev->addr_len);
> +
> + emac_mac_addr_clear(adpt, adpt->mac_addr);
> + return 0;
> +}
> +
> +/* NAPI */
> +static int emac_napi_rtx(struct napi_struct *napi, int budget)
> +{
> + struct emac_rx_queue *rx_q = container_of(napi, struct emac_rx_queue,
> + napi);
> + struct emac_adapter *adpt = netdev_priv(rx_q->netdev);
> + struct emac_irq *irq = rx_q->irq;
> +
> + int work_done = 0;
> +
> + /* Keep link state information with original netdev */
> + if (!netif_carrier_ok(adpt->netdev))
> + goto quit_polling;
> +
> + emac_mac_rx_process(adpt, rx_q, &work_done, budget);
> +
> + if (work_done < budget) {
> +quit_polling:
> + napi_complete(napi);
> +
> + irq->mask |= rx_q->intr;
> + writel_relaxed(irq->mask, adpt->base +
> + emac_irq_cfg_tbl[irq->idx].mask_reg);
> + wmb(); /* ensure that interrupt enable is flushed to HW */
> + }
> +
> + return work_done;
> +}
> +
> +/* Transmit the packet */
> +static int emac_start_xmit(struct sk_buff *skb,
> + struct net_device *netdev)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> + struct emac_tx_queue *tx_q = &adpt->tx_q[EMAC_ACTIVE_TXQ];
> +
> + return emac_mac_tx_buf_send(adpt, tx_q, skb);
> +}
> +
> +/* ISR */
> +static irqreturn_t emac_wol_isr(int irq, void *data)
> +{
> + netif_dbg(emac_irq_get_adpt(data), wol, emac_irq_get_adpt(data)->netdev,
> + "EMAC wol interrupt received\n");
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t emac_isr(int _irq, void *data)
> +{
> + struct emac_irq *irq = data;
> + const struct emac_irq_config *irq_cfg = &emac_irq_cfg_tbl[irq->idx];
> + struct emac_adapter *adpt = emac_irq_get_adpt(data);
> + struct emac_rx_queue *rx_q = &adpt->rx_q[irq->idx];
> +
> + int max_ints = 1;
> + u32 isr, status;
> +
> + /* disable the interrupt */
> + writel_relaxed(0, adpt->base + irq_cfg->mask_reg);
> + wmb(); /* ensure that interrupt disable is flushed to HW */
> +
> + do {
> + isr = readl_relaxed(adpt->base + irq_cfg->status_reg);
> + status = isr & irq->mask;
> +
> + if (status == 0)
> + break;
> +
> + if (status & ISR_ERROR) {
> + netif_warn(adpt, intr, adpt->netdev,
> + "warning: error irq status 0x%x\n",
> + status & ISR_ERROR);
> + /* reset MAC */
> + set_bit(EMAC_STATUS_TASK_REINIT_REQ, &adpt->status);
> + emac_work_thread_reschedule(adpt);
> + }
> +
> + /* Schedule the napi for receive queue with interrupt
> + * status bit set
> + */
> + if ((status & rx_q->intr)) {
> + if (napi_schedule_prep(&rx_q->napi)) {
> + irq->mask &= ~rx_q->intr;
> + __napi_schedule(&rx_q->napi);
> + }
> + }
> +
> + if (status & ISR_TX_PKT) {
> + if (status & TX_PKT_INT)
> + emac_mac_tx_process(adpt, &adpt->tx_q[0]);
> + if (status & TX_PKT_INT1)
> + emac_mac_tx_process(adpt, &adpt->tx_q[1]);
> + if (status & TX_PKT_INT2)
> + emac_mac_tx_process(adpt, &adpt->tx_q[2]);
> + if (status & TX_PKT_INT3)
> + emac_mac_tx_process(adpt, &adpt->tx_q[3]);
> + }
> +
> + if (status & ISR_OVER)
> + netif_warn(adpt, intr, adpt->netdev,
> + "warning: TX/RX overflow status 0x%x\n",
> + status & ISR_OVER);
> +
> + /* link event */
> + if (status & (ISR_GPHY_LINK | SW_MAN_INT)) {
> + emac_lsc_schedule_check(adpt);
> + break;
> + }
> + } while (--max_ints > 0);
> +
> + /* enable the interrupt */
> + writel_relaxed(irq->mask, adpt->base + irq_cfg->mask_reg);
> + wmb(); /* ensure that interrupt enable is flushed to HW */
> + return IRQ_HANDLED;
> +}
> +
> +/* Configure VLAN tag strip/insert feature */
> +static int emac_set_features(struct net_device *netdev,
> + netdev_features_t features)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> +
> + netdev_features_t changed = features ^ netdev->features;
> +
> + if (!(changed & (NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX)))
> + return 0;
> +
> + netdev->features = features;
> + if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
> + set_bit(EMAC_STATUS_VLANSTRIP_EN, &adpt->status);
> + else
> + clear_bit(EMAC_STATUS_VLANSTRIP_EN, &adpt->status);
> +
> + if (netif_running(netdev))
> + emac_reinit_locked(adpt);
> +
> + return 0;
> +}
> +
> +/* Configure Multicast and Promiscuous modes */
> +void emac_rx_mode_set(struct net_device *netdev)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> +
> + struct netdev_hw_addr *ha;
> +
> + /* Check for Promiscuous and All Multicast modes */
> + if (netdev->flags & IFF_PROMISC) {
> + set_bit(EMAC_STATUS_PROMISC_EN, &adpt->status);
> + } else if (netdev->flags & IFF_ALLMULTI) {
> + set_bit(EMAC_STATUS_MULTIALL_EN, &adpt->status);
> + clear_bit(EMAC_STATUS_PROMISC_EN, &adpt->status);
> + } else {
> + clear_bit(EMAC_STATUS_MULTIALL_EN, &adpt->status);
> + clear_bit(EMAC_STATUS_PROMISC_EN, &adpt->status);
> + }
> + emac_mac_mode_config(adpt);
> +
> + /* update multicast address filtering */
> + emac_mac_multicast_addr_clear(adpt);
> + netdev_for_each_mc_addr(ha, netdev)
> + emac_mac_multicast_addr_set(adpt, ha->addr);
> +}
> +
> +/* Change the Maximum Transfer Unit (MTU) */
> +static int emac_change_mtu(struct net_device *netdev, int new_mtu)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> + int old_mtu = netdev->mtu;
> + int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
> +
> + if ((max_frame < EMAC_MIN_ETH_FRAME_SIZE) ||
> + (max_frame > EMAC_MAX_ETH_FRAME_SIZE)) {
> + netdev_err(adpt->netdev, "error: invalid MTU setting\n");
> + return -EINVAL;
> + }
> +
> + if ((old_mtu != new_mtu) && netif_running(netdev)) {
> + netif_info(adpt, hw, adpt->netdev,
> + "changing MTU from %d to %d\n", netdev->mtu,
> + new_mtu);
> + netdev->mtu = new_mtu;
> + adpt->mtu = new_mtu;
> + adpt->rxbuf_size = new_mtu > EMAC_DEF_RX_BUF_SIZE ?
> + ALIGN(max_frame, 8) : EMAC_DEF_RX_BUF_SIZE;
> + emac_reinit_locked(adpt);
> + }
> +
> + return 0;
> +}
> +
> +/* Called when the network interface is made active */
> +static int emac_open(struct net_device *netdev)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> + int retval;
> +
> + netif_carrier_off(netdev);
> +
> + /* allocate rx/tx dma buffer & descriptors */
> + retval = emac_mac_rx_tx_rings_alloc_all(adpt);
> + if (retval) {
> + netdev_err(adpt->netdev, "error allocating rx/tx rings\n");
> + goto err_alloc_rtx;
Just do "return retval" here.
> + }
> +
> + pm_runtime_set_active(netdev->dev.parent);
> + pm_runtime_enable(netdev->dev.parent);
> +
> + retval = emac_mac_up(adpt);
> + if (retval)
> + goto err_up;
Just do "emac_mac_rx_tx_rings_free_all(adpt);" here. You don't need any
of these gotos.
> +
> + return retval;
> +
> +err_up:
> + emac_mac_rx_tx_rings_free_all(adpt);
> +err_alloc_rtx:
> + return retval;
> +}
> +
> +/* Called when the network interface is disabled */
> +static int emac_close(struct net_device *netdev)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> +
> + /* ensure no task is running and no reset is in progress */
> + while (test_and_set_bit(EMAC_STATUS_RESETTING, &adpt->status))
> + msleep(20); /* Reset might take few 10s of ms */
> +
> + pm_runtime_disable(netdev->dev.parent);
> + if (!test_bit(EMAC_STATUS_DOWN, &adpt->status))
> + emac_mac_down(adpt, true);
> + else
> + emac_mac_reset(adpt);
> +
> + emac_mac_rx_tx_rings_free_all(adpt);
> +
> + clear_bit(EMAC_STATUS_RESETTING, &adpt->status);
> + return 0;
> +}
> +
> +/* PHY related IOCTLs */
> +static int emac_mii_ioctl(struct net_device *netdev,
> + struct ifreq *ifr, int cmd)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> + struct emac_phy *phy = &adpt->phy;
> + struct mii_ioctl_data *data = if_mii(ifr);
> + int retval = 0;
> +
> + switch (cmd) {
> + case SIOCGMIIPHY:
> + data->phy_id = phy->addr;
> + break;
> +
> + case SIOCGMIIREG:
> + if (!capable(CAP_NET_ADMIN)) {
> + retval = -EPERM;
> + break;
> + }
> +
> + if (data->reg_num & ~(0x1F)) {
> + retval = -EFAULT;
> + break;
> + }
> +
> + if (data->phy_id >= PHY_MAX_ADDR) {
> + retval = -EFAULT;
> + break;
> + }
> +
> + if (phy->external && data->phy_id != phy->addr) {
> + retval = -EFAULT;
> + break;
> + }
> +
> + retval = emac_phy_read(adpt, data->phy_id, data->reg_num,
> + &data->val_out);
> + break;
> +
> + case SIOCSMIIREG:
> + if (!capable(CAP_NET_ADMIN)) {
> + retval = -EPERM;
> + break;
> + }
> +
> + if (data->reg_num & ~(0x1F)) {
> + retval = -EFAULT;
> + break;
> + }
> +
> + if (data->phy_id >= PHY_MAX_ADDR) {
> + retval = -EFAULT;
> + break;
> + }
> +
> + if (phy->external && data->phy_id != phy->addr) {
> + retval = -EFAULT;
> + break;
> + }
> +
> + retval = emac_phy_write(adpt, data->phy_id, data->reg_num,
> + data->val_in);
> +
> + break;
> + }
Instead of doing "retval == xxx; break", this function would be half the
size if you just did "return xxx" directly.
> +
> + return retval;
> +}
> +
> +/* Respond to a TX hang */
> +static void emac_tx_timeout(struct net_device *netdev)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> +
> + if (!test_bit(EMAC_STATUS_DOWN, &adpt->status)) {
> + set_bit(EMAC_STATUS_TASK_REINIT_REQ, &adpt->status);
> + emac_work_thread_reschedule(adpt);
> + }
> +}
> +
> +/* IOCTL support for the interface */
> +static int emac_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
> +{
> + switch (cmd) {
> + case SIOCGMIIPHY:
> + case SIOCGMIIREG:
> + case SIOCSMIIREG:
> + return emac_mii_ioctl(netdev, ifr, cmd);
> + case SIOCSHWTSTAMP:
> + default:
The "case SIOCSHWTSTAMP" is redundant.
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +/* Provide network statistics info for the interface */
> +struct rtnl_link_stats64 *emac_get_stats64(struct net_device *netdev,
> + struct rtnl_link_stats64 *net_stats)
> +{
> + struct emac_adapter *adpt = netdev_priv(netdev);
> + struct emac_stats *stats = &adpt->stats;
> + u16 addr = REG_MAC_RX_STATUS_BIN;
> + u64 *stats_itr = &adpt->stats.rx_ok;
> + u32 val;
> +
> + while (addr <= REG_MAC_RX_STATUS_END) {
> + val = readl_relaxed(adpt->base + addr);
> + *stats_itr += val;
> + ++stats_itr;
> + addr += sizeof(u32);
> + }
> +
> + /* additional rx status */
> + val = readl_relaxed(adpt->base + EMAC_RXMAC_STATC_REG23);
> + adpt->stats.rx_crc_align += val;
> + val = readl_relaxed(adpt->base + EMAC_RXMAC_STATC_REG24);
> + adpt->stats.rx_jubbers += val;
> +
> + /* update tx status */
> + addr = REG_MAC_TX_STATUS_BIN;
> + stats_itr = &adpt->stats.tx_ok;
> +
> + while (addr <= REG_MAC_TX_STATUS_END) {
> + val = readl_relaxed(adpt->base + addr);
> + *stats_itr += val;
> + ++stats_itr;
> + addr += sizeof(u32);
> + }
> +
> + /* additional tx status */
> + val = readl_relaxed(adpt->base + EMAC_TXMAC_STATC_REG25);
> + adpt->stats.tx_col += val;
> +
> + /* return parsed statistics */
> + net_stats->rx_packets = stats->rx_ok;
> + net_stats->tx_packets = stats->tx_ok;
> + net_stats->rx_bytes = stats->rx_byte_cnt;
> + net_stats->tx_bytes = stats->tx_byte_cnt;
> + net_stats->multicast = stats->rx_mcast;
> + net_stats->collisions = stats->tx_1_col + stats->tx_2_col * 2 +
> + stats->tx_late_col + stats->tx_abort_col;
> +
> + net_stats->rx_errors = stats->rx_frag + stats->rx_fcs_err +
> + stats->rx_len_err + stats->rx_sz_ov +
> + stats->rx_align_err;
> + net_stats->rx_fifo_errors = stats->rx_rxf_ov;
> + net_stats->rx_length_errors = stats->rx_len_err;
> + net_stats->rx_crc_errors = stats->rx_fcs_err;
> + net_stats->rx_frame_errors = stats->rx_align_err;
> + net_stats->rx_over_errors = stats->rx_rxf_ov;
> + net_stats->rx_missed_errors = stats->rx_rxf_ov;
> +
> + net_stats->tx_errors = stats->tx_late_col + stats->tx_abort_col +
> + stats->tx_underrun + stats->tx_trunc;
> + net_stats->tx_fifo_errors = stats->tx_underrun;
> + net_stats->tx_aborted_errors = stats->tx_abort_col;
> + net_stats->tx_window_errors = stats->tx_late_col;
> +
> + return net_stats;
> +}
> +
> +static const struct net_device_ops emac_netdev_ops = {
> + .ndo_open = &emac_open,
> + .ndo_stop = &emac_close,
> + .ndo_validate_addr = ð_validate_addr,
> + .ndo_start_xmit = &emac_start_xmit,
> + .ndo_set_mac_address = &emac_set_mac_address,
> + .ndo_change_mtu = &emac_change_mtu,
> + .ndo_do_ioctl = &emac_ioctl,
> + .ndo_tx_timeout = &emac_tx_timeout,
> + .ndo_get_stats64 = &emac_get_stats64,
> + .ndo_set_features = emac_set_features,
> + .ndo_set_rx_mode = emac_rx_mode_set,
> +};
> +
> +static inline char *emac_link_speed_to_str(u32 speed)
Should should not be inline.
static const char *emac_link_speed_to_str(u32 speed)
> +{
> + switch (speed) {
> + case EMAC_LINK_SPEED_1GB_FULL:
> + return "1 Gbps Duplex Full";
> + case EMAC_LINK_SPEED_100_FULL:
> + return "100 Mbps Duplex Full";
> + case EMAC_LINK_SPEED_100_HALF:
> + return "100 Mbps Duplex Half";
> + case EMAC_LINK_SPEED_10_FULL:
> + return "10 Mbps Duplex Full";
> + case EMAC_LINK_SPEED_10_HALF:
> + return "10 Mbps Duplex HALF";
> + default:
> + return "unknown speed";
> + }
> +}
> +
> +/* Check link status and handle link state changes */
> +static void emac_work_thread_link_check(struct emac_adapter *adpt)
> +{
> + struct net_device *netdev = adpt->netdev;
> + struct emac_phy *phy = &adpt->phy;
> +
> + char *speed;
const char *speed;
> +
> + if (!test_bit(EMAC_STATUS_TASK_LSC_REQ, &adpt->status))
> + return;
> + clear_bit(EMAC_STATUS_TASK_LSC_REQ, &adpt->status);
> +
> + /* ensure that no reset is in progress while link task is running */
> + while (test_and_set_bit(EMAC_STATUS_RESETTING, &adpt->status))
> + msleep(20); /* Reset might take few 10s of ms */
> +
> + if (test_bit(EMAC_STATUS_DOWN, &adpt->status))
> + goto link_task_done;
> +
> + emac_phy_link_check(adpt, &phy->link_speed, &phy->link_up);
> + speed = emac_link_speed_to_str(phy->link_speed);
> +
> + if (phy->link_up) {
> + if (netif_carrier_ok(netdev))
> + goto link_task_done;
> +
> + pm_runtime_get_sync(netdev->dev.parent);
> + netif_info(adpt, timer, adpt->netdev, "NIC Link is Up %s\n",
> + speed);
> +
> + emac_mac_start(adpt);
> + netif_carrier_on(netdev);
> + netif_wake_queue(netdev);
> + } else {
> + if (time_after(adpt->link_chk_timeout, jiffies))
> + set_bit(EMAC_STATUS_TASK_LSC_REQ, &adpt->status);
> +
> + /* only continue if link was up previously */
> + if (!netif_carrier_ok(netdev))
> + goto link_task_done;
> +
> + phy->link_speed = 0;
> + netif_info(adpt, timer, adpt->netdev, "NIC Link is Down\n");
> + netif_stop_queue(netdev);
> + netif_carrier_off(netdev);
> +
> + emac_mac_stop(adpt);
> + pm_runtime_put_sync(netdev->dev.parent);
> + }
> +
> + /* link state transition, kick timer */
> + mod_timer(&adpt->timers, jiffies);
> +
> +link_task_done:
> + clear_bit(EMAC_STATUS_RESETTING, &adpt->status);
> +}
> +
> +/* Watchdog task routine */
> +static void emac_work_thread(struct work_struct *work)
> +{
> + struct emac_adapter *adpt = container_of(work, struct emac_adapter,
> + work_thread);
> +
> + if (!test_bit(EMAC_STATUS_WATCH_DOG, &adpt->status))
> + netif_warn(adpt, timer, adpt->netdev,
> + "warning: WATCH_DOG flag isn't set\n");
> +
> + if (test_bit(EMAC_STATUS_TASK_REINIT_REQ, &adpt->status)) {
> + clear_bit(EMAC_STATUS_TASK_REINIT_REQ, &adpt->status);
> +
> + if ((!test_bit(EMAC_STATUS_DOWN, &adpt->status)) &&
> + (!test_bit(EMAC_STATUS_RESETTING, &adpt->status)))
> + emac_reinit_locked(adpt);
> + }
> +
> + emac_work_thread_link_check(adpt);
> + emac_phy_periodic_check(adpt);
> + clear_bit(EMAC_STATUS_WATCH_DOG, &adpt->status);
> +}
> +
> +/* Timer routine */
> +static void emac_timer_thread(unsigned long data)
> +{
> + struct emac_adapter *adpt = (struct emac_adapter *)data;
> + unsigned long delay;
> +
> + if (pm_runtime_status_suspended(adpt->netdev->dev.parent))
> + return;
> +
> + /* poll faster when waiting for link */
> + if (test_bit(EMAC_STATUS_TASK_LSC_REQ, &adpt->status))
> + delay = HZ / 10;
> + else
> + delay = 2 * HZ;
> +
> + /* Reset the timer */
> + mod_timer(&adpt->timers, delay + jiffies);
> +
> + emac_work_thread_reschedule(adpt);
> +}
> +
> +/* Initialize various data structures */
> +static void emac_init_adapter(struct emac_adapter *adpt)
> +{
> + struct emac_phy *phy = &adpt->phy;
> + int max_frame;
> + u32 reg;
> +
> + /* ids */
> + reg = readl_relaxed(adpt->base + EMAC_DMA_MAS_CTRL);
> + adpt->devid = (reg & DEV_ID_NUM_BMSK) >> DEV_ID_NUM_SHFT;
> + adpt->revid = (reg & DEV_REV_NUM_BMSK) >> DEV_REV_NUM_SHFT;
> +
> + /* descriptors */
> + adpt->tx_desc_cnt = EMAC_DEF_TX_DESCS;
> + adpt->rx_desc_cnt = EMAC_DEF_RX_DESCS;
> +
> + /* mtu */
> + adpt->netdev->mtu = ETH_DATA_LEN;
> + adpt->mtu = adpt->netdev->mtu;
> + max_frame = adpt->netdev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
> + adpt->rxbuf_size = adpt->netdev->mtu > EMAC_DEF_RX_BUF_SIZE ?
> + ALIGN(max_frame, 8) : EMAC_DEF_RX_BUF_SIZE;
> +
> + /* dma */
> + adpt->dma_order = emac_dma_ord_out;
> + adpt->dmar_block = emac_dma_req_4096;
> + adpt->dmaw_block = emac_dma_req_128;
> + adpt->dmar_dly_cnt = DMAR_DLY_CNT_DEF;
> + adpt->dmaw_dly_cnt = DMAW_DLY_CNT_DEF;
> + adpt->tpd_burst = TXQ0_NUM_TPD_PREF_DEF;
> + adpt->rfd_burst = RXQ0_NUM_RFD_PREF_DEF;
> +
> + /* link */
> + phy->link_up = false;
> + phy->link_speed = EMAC_LINK_SPEED_UNKNOWN;
> +
> + /* flow control */
> + phy->req_fc_mode = EMAC_FC_FULL;
> + phy->cur_fc_mode = EMAC_FC_FULL;
> + phy->disable_fc_autoneg = false;
> +
> + /* rss */
> + adpt->rss_initialized = false;
> + adpt->rss_hstype = 0;
> + adpt->rss_idt_size = 0;
> + adpt->rss_base_cpu = 0;
> + memset(adpt->rss_idt, 0x0, sizeof(adpt->rss_idt));
> + memset(adpt->rss_key, 0x0, sizeof(adpt->rss_key));
> +
> + /* irq moderator */
> + reg = ((EMAC_DEF_RX_IRQ_MOD >> 1) << IRQ_MODERATOR2_INIT_SHFT) |
> + ((EMAC_DEF_TX_IRQ_MOD >> 1) << IRQ_MODERATOR_INIT_SHFT);
> + adpt->irq_mod = reg;
> +
> + /* others */
> + adpt->preamble = EMAC_PREAMBLE_DEF;
> + adpt->wol = EMAC_WOL_MAGIC | EMAC_WOL_PHY;
> +}
> +
> +#ifdef CONFIG_PM
> +static int emac_runtime_suspend(struct device *device)
> +{
> + struct platform_device *pdev = to_platform_device(device);
> + struct net_device *netdev = dev_get_drvdata(&pdev->dev);
> + struct emac_adapter *adpt = netdev_priv(netdev);
> +
> + emac_mac_pm(adpt, adpt->phy.link_speed, !!adpt->wol,
> + !!(adpt->wol & EMAC_WOL_MAGIC));
> + return 0;
> +}
> +
> +static int emac_runtime_idle(struct device *device)
> +{
> + struct platform_device *pdev = to_platform_device(device);
> + struct net_device *netdev = dev_get_drvdata(&pdev->dev);
> +
> + /* schedule to enter runtime suspend state if the link does
> + * not come back up within the specified time
> + */
> + pm_schedule_suspend(netdev->dev.parent,
> + jiffies_to_msecs(EMAC_TRY_LINK_TIMEOUT));
> + return -EBUSY;
> +}
> +#endif /* CONFIG_PM */
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int emac_suspend(struct device *device)
> +{
> + struct platform_device *pdev = to_platform_device(device);
> + struct net_device *netdev = dev_get_drvdata(&pdev->dev);
> + struct emac_adapter *adpt = netdev_priv(netdev);
> + struct emac_phy *phy = &adpt->phy;
> + int i;
> + u32 speed, adv_speed;
> + bool link_up = false;
> + int retval = 0;
> +
> + /* cannot suspend if WOL is disabled */
> + if (!adpt->irq[EMAC_WOL_IRQ].irq)
> + return -EPERM;
> +
> + netif_device_detach(netdev);
> + if (netif_running(netdev)) {
> + /* ensure no task is running and no reset is in progress */
> + while (test_and_set_bit(EMAC_STATUS_RESETTING, &adpt->status))
> + msleep(20); /* Reset might take few 10s of ms */
> +
> + emac_mac_down(adpt, false);
> +
> + clear_bit(EMAC_STATUS_RESETTING, &adpt->status);
> + }
> +
> + emac_phy_link_check(adpt, &speed, &link_up);
> +
> + if (link_up) {
> + adv_speed = EMAC_LINK_SPEED_10_HALF;
> + emac_phy_link_speed_get(adpt, &adv_speed);
> +
> + retval = emac_phy_link_setup(adpt, adv_speed, true,
> + !adpt->phy.disable_fc_autoneg);
> + if (retval)
> + return retval;
> +
> + link_up = false;
> + for (i = 0; i < EMAC_MAX_SETUP_LNK_CYCLE; i++) {
> + retval = emac_phy_link_check(adpt, &speed, &link_up);
> + if ((!retval) && link_up)
> + break;
> +
> + /* link can take upto few seconds to come up */
"up to"
> + msleep(100);
> + }
> + }
> +
> + if (!link_up)
> + speed = EMAC_LINK_SPEED_10_HALF;
> +
> + phy->link_speed = speed;
> + phy->link_up = link_up;
> +
> + emac_mac_wol_config(adpt, adpt->wol);
> + emac_mac_pm(adpt, phy->link_speed, !!adpt->wol,
> + !!(adpt->wol & EMAC_WOL_MAGIC));
> + return 0;
> +}
> +
> +static int emac_resume(struct device *device)
> +{
> + struct platform_device *pdev = to_platform_device(device);
> + struct net_device *netdev = dev_get_drvdata(&pdev->dev);
> + struct emac_adapter *adpt = netdev_priv(netdev);
> + struct emac_phy *phy = &adpt->phy;
> + u32 retval;
> +
> + emac_mac_reset(adpt);
> + retval = emac_phy_link_setup(adpt, phy->autoneg_advertised, true,
> + !phy->disable_fc_autoneg);
> + if (retval)
> + return retval;
> +
> + emac_mac_wol_config(adpt, 0);
> + if (netif_running(netdev)) {
> + retval = emac_mac_up(adpt);
> + if (retval)
> + return retval;
> + }
> +
> + netif_device_attach(netdev);
> + return 0;
> +}
> +#endif /* CONFIG_PM_SLEEP */
> +
> +/* Get the clock */
> +static int emac_clks_get(struct platform_device *pdev,
> + struct emac_adapter *adpt)
> +{
> + struct clk *clk;
> + int i;
> +
> + for (i = 0; i < EMAC_CLK_CNT; i++) {
> + clk = clk_get(&pdev->dev, emac_clk_name[i]);
> +
> + if (IS_ERR(clk)) {
> + netdev_err(adpt->netdev, "error:%ld on clk_get(%s)\n",
> + PTR_ERR(clk), emac_clk_name[i]);
> +
> + while (--i >= 0)
> + if (adpt->clk[i])
> + clk_put(adpt->clk[i]);
> + return PTR_ERR(clk);
> + }
> +
> + adpt->clk[i] = clk;
> + }
> +
> + return 0;
> +}
> +
> +/* Initialize clocks */
> +static int emac_clks_phase1_init(struct emac_adapter *adpt)
> +{
> + int retval;
> +
> + retval = clk_prepare_enable(adpt->clk[EMAC_CLK_AXI]);
> + if (retval)
> + return retval;
> +
> + retval = clk_prepare_enable(adpt->clk[EMAC_CLK_CFG_AHB]);
> + if (retval)
> + return retval;
> +
> + retval = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED],
> + EMC_CLK_RATE_19_2MHZ);
> + if (retval)
> + return retval;
> +
> + retval = clk_prepare_enable(adpt->clk[EMAC_CLK_HIGH_SPEED]);
> +
> + return retval;
Just do "return clk_prepare_enable(adpt->clk[EMAC_CLK_HIGH_SPEED]);"
> +}
> +
> +/* Enable clocks; needs emac_clks_phase1_init to be called before */
> +static int emac_clks_phase2_init(struct emac_adapter *adpt)
> +{
> + int retval;
> +
> + retval = clk_set_rate(adpt->clk[EMAC_CLK_TX], EMC_CLK_RATE_125MHZ);
> + if (retval)
> + return retval;
> +
> + retval = clk_prepare_enable(adpt->clk[EMAC_CLK_TX]);
> + if (retval)
> + return retval;
> +
> + retval = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED],
> + EMC_CLK_RATE_125MHZ);
> + if (retval)
> + return retval;
> +
> + retval = clk_set_rate(adpt->clk[EMAC_CLK_MDIO],
> + EMC_CLK_RATE_25MHZ);
> + if (retval)
> + return retval;
> +
> + retval = clk_prepare_enable(adpt->clk[EMAC_CLK_MDIO]);
> + if (retval)
> + return retval;
> +
> + retval = clk_prepare_enable(adpt->clk[EMAC_CLK_RX]);
> + if (retval)
> + return retval;
> +
> + retval = clk_prepare_enable(adpt->clk[EMAC_CLK_SYS]);
> +
> + return retval;
Same here
> +}
> +
> +static void emac_clks_phase1_teardown(struct emac_adapter *adpt)
> +{
> + clk_disable_unprepare(adpt->clk[EMAC_CLK_AXI]);
> + clk_disable_unprepare(adpt->clk[EMAC_CLK_CFG_AHB]);
> + clk_disable_unprepare(adpt->clk[EMAC_CLK_HIGH_SPEED]);
> +}
> +
> +static void emac_clks_phase2_teardown(struct emac_adapter *adpt)
> +{
> + clk_disable_unprepare(adpt->clk[EMAC_CLK_TX]);
> + clk_disable_unprepare(adpt->clk[EMAC_CLK_MDIO]);
> + clk_disable_unprepare(adpt->clk[EMAC_CLK_RX]);
> + clk_disable_unprepare(adpt->clk[EMAC_CLK_SYS]);
> +}
> +
> +/* Get the resources */
> +static int emac_probe_resources(struct platform_device *pdev,
> + struct emac_adapter *adpt)
> +{
> + struct net_device *netdev = adpt->netdev;
> + struct device_node *node = pdev->dev.of_node;
> + struct resource *res;
> + const void *maddr;
> + int retval = 0;
> + int i;
> +
> + if (!node)
> + return -ENODEV;
> +
> + /* get id */
> + retval = of_property_read_u32(node, "cell-index", &pdev->id);
> + if (retval)
> + return retval;
> +
> + /* get time stamp enable flag */
> + adpt->timestamp_en = of_property_read_bool(node, "qcom,emac-tstamp-en");
> +
> + /* get gpios */
> + for (i = 0; adpt->phy.uses_gpios && i < EMAC_GPIO_CNT; i++) {
> + retval = of_get_named_gpio(node, emac_gpio_name[i], 0);
> + if (retval < 0)
> + return retval;
> +
> + adpt->gpio[i] = retval;
> + }
> +
> + /* get mac address */
> + maddr = of_get_mac_address(node);
> + if (!maddr)
> + return -ENODEV;
> +
> + memcpy(adpt->mac_perm_addr, maddr, netdev->addr_len);
> +
> + /* get irqs */
> + for (i = 0; i < EMAC_IRQ_CNT; i++) {
> + retval = platform_get_irq_byname(pdev,
> + emac_irq_cfg_tbl[i].name);
> + adpt->irq[i].irq = (retval > 0) ? retval : 0;
> + }
> +
> + retval = emac_clks_get(pdev, adpt);
> + if (retval)
> + return retval;
> +
> + /* get register addresses */
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
> + if (!res) {
> + netdev_err(adpt->netdev, "error: missing 'base' resource\n");
> + retval = -ENXIO;
> + goto err_reg_res;
> + }
> +
> + adpt->base = devm_ioremap_resource(&pdev->dev, res);
> + if (!adpt->base) {
> + retval = -ENOMEM;
> + goto err_reg_res;
> + }
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "csr");
> + if (!res) {
> + netdev_err(adpt->netdev, "error: missing 'csr' resource\n");
> + retval = -ENXIO;
> + goto err_reg_res;
> + }
> +
> + adpt->csr = devm_ioremap_resource(&pdev->dev, res);
> + if (!adpt->csr) {
> + retval = -ENOMEM;
> + goto err_reg_res;
> + }
> +
> + netdev->base_addr = (unsigned long)adpt->base;
> + return 0;
> +
> +err_reg_res:
> + for (i = 0; i < EMAC_CLK_CNT; i++) {
> + if (adpt->clk[i])
> + clk_put(adpt->clk[i]);
> + }
> +
> + return retval;
> +}
> +
> +/* Release resources */
> +static void emac_release_resources(struct emac_adapter *adpt)
> +{
> + int i;
> +
> + for (i = 0; i < EMAC_CLK_CNT; i++) {
> + if (adpt->clk[i])
> + clk_put(adpt->clk[i]);
Do you need
adpt->clk[i] = NULL;
here and everywhere else you call clk_put()?
> + }
> +}
> +
> +/* Probe function */
> +static int emac_probe(struct platform_device *pdev)
> +{
> + struct net_device *netdev;
> + struct emac_adapter *adpt;
> + struct emac_phy *phy;
> + int i, retval = 0;
> + u32 hw_ver;
> +
> + netdev = alloc_etherdev(sizeof(struct emac_adapter));
> + if (!netdev)
> + return -ENOMEM;
> +
> + dev_set_drvdata(&pdev->dev, netdev);
> + SET_NETDEV_DEV(netdev, &pdev->dev);
> +
> + adpt = netdev_priv(netdev);
> + adpt->netdev = netdev;
> + phy = &adpt->phy;
> + adpt->msg_enable = netif_msg_init(debug, EMAC_MSG_DEFAULT);
> +
> + adpt->dma_mask = DMA_BIT_MASK(32);
> + pdev->dev.dma_mask = &adpt->dma_mask;
> + pdev->dev.dma_parms = &adpt->dma_parms;
> + pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
How about dma_set_mask_and_coherent()? Or maybe
dma_coerce_mask_and_coherent().
> +
> + dma_set_max_seg_size(&pdev->dev, 65536);
> + dma_set_seg_boundary(&pdev->dev, 0xffffffff);
> +
> + for (i = 0; i < EMAC_IRQ_CNT; i++) {
> + adpt->irq[i].idx = i;
> + adpt->irq[i].mask = emac_irq_cfg_tbl[i].init_mask;
> + }
> + adpt->irq[0].mask |= (emac_irq_use_extended ? IMR_EXTENDED_MASK :
> + IMR_NORMAL_MASK);
> +
> + retval = emac_probe_resources(pdev, adpt);
> + if (retval)
> + goto err_undo_netdev;
> +
> + /* initialize clocks */
> + retval = emac_clks_phase1_init(adpt);
> + if (retval)
> + goto err_undo_resources;
> +
> + hw_ver = readl_relaxed(adpt->base + EMAC_CORE_HW_VERSION);
> +
> + netdev->watchdog_timeo = EMAC_WATCHDOG_TIME;
> + netdev->irq = adpt->irq[0].irq;
> +
> + if (adpt->timestamp_en)
> + adpt->rrd_size = EMAC_TS_RRD_SIZE;
> + else
> + adpt->rrd_size = EMAC_RRD_SIZE;
> +
> + adpt->tpd_size = EMAC_TPD_SIZE;
> + adpt->rfd_size = EMAC_RFD_SIZE;
> +
> + /* init netdev */
> + netdev->netdev_ops = &emac_netdev_ops;
> +
> + /* init adapter */
> + emac_init_adapter(adpt);
> +
> + /* init phy */
> + retval = emac_phy_config(pdev, adpt);
> + if (retval)
> + goto err_undo_clk_phase1;
> +
> + /* enable clocks */
> + retval = emac_clks_phase2_init(adpt);
> + if (retval)
> + goto err_undo_clk_phase1;
> +
> + /* init external phy */
> + retval = emac_phy_external_init(adpt);
> + if (retval)
> + goto err_undo_clk_phase2;
> +
> + /* reset mac */
> + emac_mac_reset(adpt);
> +
> + /* setup link to put it in a known good starting state */
> + retval = emac_phy_link_setup(adpt, phy->autoneg_advertised, true,
> + !phy->disable_fc_autoneg);
> + if (retval)
> + goto err_undo_clk_phase2;
> +
> + /* set mac address */
> + memcpy(adpt->mac_addr, adpt->mac_perm_addr, netdev->addr_len);
> + memcpy(netdev->dev_addr, adpt->mac_addr, netdev->addr_len);
> + emac_mac_addr_clear(adpt, adpt->mac_addr);
> +
> + /* set hw features */
> + netdev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
> + NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_HW_VLAN_CTAG_RX |
> + NETIF_F_HW_VLAN_CTAG_TX;
> + netdev->hw_features = netdev->features;
> +
> + netdev->vlan_features |= NETIF_F_SG | NETIF_F_HW_CSUM |
> + NETIF_F_TSO | NETIF_F_TSO6;
> +
> + setup_timer(&adpt->timers, &emac_timer_thread,
> + (unsigned long)adpt);
> + INIT_WORK(&adpt->work_thread, emac_work_thread);
> +
> + /* Initialize queues */
> + emac_mac_rx_tx_ring_init_all(pdev, adpt);
> +
> + for (i = 0; i < adpt->rx_q_cnt; i++)
> + netif_napi_add(netdev, &adpt->rx_q[i].napi,
> + emac_napi_rtx, 64);
> +
> + spin_lock_init(&adpt->tx_ts_lock);
> + skb_queue_head_init(&adpt->tx_ts_pending_queue);
> + skb_queue_head_init(&adpt->tx_ts_ready_queue);
> + INIT_WORK(&adpt->tx_ts_task, emac_mac_tx_ts_periodic_routine);
> +
> + set_bit(EMAC_STATUS_VLANSTRIP_EN, &adpt->status);
> + set_bit(EMAC_STATUS_DOWN, &adpt->status);
> + strlcpy(netdev->name, "eth%d", sizeof(netdev->name));
> +
> + retval = register_netdev(netdev);
> + if (retval)
> + goto err_undo_clk_phase2;
> +
> + pr_info("%s - version %s\n", emac_drv_description, emac_drv_version);
Should be dev_info or dev_dbg instead.
> + netif_dbg(adpt, probe, adpt->netdev, "EMAC HW ID %d.%d\n", adpt->devid,
> + adpt->revid);
> + netif_dbg(adpt, probe, adpt->netdev, "EMAC HW version %d.%d.%d\n",
> + (hw_ver & MAJOR_BMSK) >> MAJOR_SHFT,
> + (hw_ver & MINOR_BMSK) >> MINOR_SHFT,
> + (hw_ver & STEP_BMSK) >> STEP_SHFT);
> + return 0;
> +
> +err_undo_clk_phase2:
> + emac_clks_phase2_teardown(adpt);
> +err_undo_clk_phase1:
> + emac_clks_phase1_teardown(adpt);
> +err_undo_resources:
> + emac_release_resources(adpt);
> +err_undo_netdev:
> + free_netdev(netdev);
> + return retval;
> +}
> +
> +static int emac_remove(struct platform_device *pdev)
> +{
> + struct net_device *netdev = dev_get_drvdata(&pdev->dev);
> + struct emac_adapter *adpt = netdev_priv(netdev);
> +
> + pr_info("removing %s\n", emac_drv_name);
Should be dev_dbg() instead, I think.
> +
> + unregister_netdev(netdev);
> + emac_clks_phase2_teardown(adpt);
> + emac_clks_phase1_teardown(adpt);
> + emac_release_resources(adpt);
> + free_netdev(netdev);
> + dev_set_drvdata(&pdev->dev, NULL);
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops emac_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(
> + emac_suspend,
> + emac_resume
> + )
> + SET_RUNTIME_PM_OPS(
> + emac_runtime_suspend,
> + NULL,
> + emac_runtime_idle
> + )
> +};
> +
> +static const struct of_device_id emac_dt_match[] = {
> + {
> + .compatible = "qcom,emac",
> + },
> + {}
> +};
> +
> +static struct platform_driver emac_platform_driver = {
> + .probe = emac_probe,
> + .remove = emac_remove,
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = emac_drv_name,
> + .pm = &emac_pm_ops,
> + .of_match_table = emac_dt_match,
> + },
> +};
> +
> +static int __init emac_module_init(void)
> +{
> + return platform_driver_register(&emac_platform_driver);
> +}
> +
> +static void __exit emac_module_exit(void)
> +{
> + platform_driver_unregister(&emac_platform_driver);
> +}
> +
> +module_init(emac_module_init);
> +module_exit(emac_module_exit);
Can you use module_platform_driver instead?
> +
> +MODULE_LICENSE("GPL");
"GPL v2"?
> diff --git a/drivers/net/ethernet/qualcomm/emac/emac.h b/drivers/net/ethernet/qualcomm/emac/emac.h
> new file mode 100644
> index 0000000..65b0369
> --- /dev/null
> +++ b/drivers/net/ethernet/qualcomm/emac/emac.h
> @@ -0,0 +1,427 @@
> +/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _EMAC_H_
> +#define _EMAC_H_
> +
> +#include <asm/byteorder.h>
> +#include <linux/interrupt.h>
> +#include <linux/netdevice.h>
> +#include <linux/clk.h>
> +#include <linux/platform_device.h>
> +#include "emac-mac.h"
> +#include "emac-phy.h"
> +
> +/* EMAC base register offsets */
> +#define EMAC_DMA_MAS_CTRL 0x001400
> +#define EMAC_IRQ_MOD_TIM_INIT 0x001408
> +#define EMAC_BLK_IDLE_STS 0x00140c
> +#define EMAC_PHY_LINK_DELAY 0x00141c
> +#define EMAC_SYS_ALIV_CTRL 0x001434
> +#define EMAC_MAC_IPGIFG_CTRL 0x001484
> +#define EMAC_MAC_STA_ADDR0 0x001488
> +#define EMAC_MAC_STA_ADDR1 0x00148c
> +#define EMAC_HASH_TAB_REG0 0x001490
> +#define EMAC_HASH_TAB_REG1 0x001494
> +#define EMAC_MAC_HALF_DPLX_CTRL 0x001498
> +#define EMAC_MAX_FRAM_LEN_CTRL 0x00149c
> +#define EMAC_INT_STATUS 0x001600
> +#define EMAC_INT_MASK 0x001604
> +#define EMAC_RXMAC_STATC_REG0 0x001700
> +#define EMAC_RXMAC_STATC_REG22 0x001758
> +#define EMAC_TXMAC_STATC_REG0 0x001760
> +#define EMAC_TXMAC_STATC_REG24 0x0017c0
> +#define EMAC_CORE_HW_VERSION 0x001974
> +#define EMAC_IDT_TABLE0 0x001b00
> +#define EMAC_RXMAC_STATC_REG23 0x001bc8
> +#define EMAC_RXMAC_STATC_REG24 0x001bcc
> +#define EMAC_TXMAC_STATC_REG25 0x001bd0
> +#define EMAC_INT1_MASK 0x001bf0
> +#define EMAC_INT1_STATUS 0x001bf4
> +#define EMAC_INT2_MASK 0x001bf8
> +#define EMAC_INT2_STATUS 0x001bfc
> +#define EMAC_INT3_MASK 0x001c00
> +#define EMAC_INT3_STATUS 0x001c04
> +
> +/* EMAC_DMA_MAS_CTRL */
> +#define DEV_ID_NUM_BMSK 0x7f000000
> +#define DEV_ID_NUM_SHFT 24
> +#define DEV_REV_NUM_BMSK 0xff0000
> +#define DEV_REV_NUM_SHFT 16
> +#define INT_RD_CLR_EN 0x4000
> +#define IRQ_MODERATOR2_EN 0x800
> +#define IRQ_MODERATOR_EN 0x400
> +#define LPW_CLK_SEL 0x80
> +#define LPW_STATE 0x20
> +#define LPW_MODE 0x10
> +#define SOFT_RST 0x1
> +
> +/* EMAC_IRQ_MOD_TIM_INIT */
> +#define IRQ_MODERATOR2_INIT_BMSK 0xffff0000
> +#define IRQ_MODERATOR2_INIT_SHFT 16
> +#define IRQ_MODERATOR_INIT_BMSK 0xffff
> +#define IRQ_MODERATOR_INIT_SHFT 0
> +
> +/* EMAC_INT_STATUS */
> +#define DIS_INT 0x80000000
> +#define PTP_INT 0x40000000
> +#define RFD4_UR_INT 0x20000000
> +#define TX_PKT_INT3 0x4000000
> +#define TX_PKT_INT2 0x2000000
> +#define TX_PKT_INT1 0x1000000
> +#define RX_PKT_INT3 0x80000
> +#define RX_PKT_INT2 0x40000
> +#define RX_PKT_INT1 0x20000
> +#define RX_PKT_INT0 0x10000
> +#define TX_PKT_INT 0x8000
> +#define TXQ_TO_INT 0x4000
> +#define GPHY_WAKEUP_INT 0x2000
> +#define GPHY_LINK_DOWN_INT 0x1000
> +#define GPHY_LINK_UP_INT 0x800
> +#define DMAW_TO_INT 0x400
> +#define DMAR_TO_INT 0x200
> +#define TXF_UR_INT 0x100
> +#define RFD3_UR_INT 0x80
> +#define RFD2_UR_INT 0x40
> +#define RFD1_UR_INT 0x20
> +#define RFD0_UR_INT 0x10
> +#define RXF_OF_INT 0x8
> +#define SW_MAN_INT 0x4
> +
> +/* EMAC_MAILBOX_6 */
> +#define RFD2_PROC_IDX_BMSK 0xfff0000
> +#define RFD2_PROC_IDX_SHFT 16
> +#define RFD2_PROD_IDX_BMSK 0xfff
> +#define RFD2_PROD_IDX_SHFT 0
> +
> +/* EMAC_CORE_HW_VERSION */
> +#define MAJOR_BMSK 0xf0000000
> +#define MAJOR_SHFT 28
> +#define MINOR_BMSK 0xfff0000
> +#define MINOR_SHFT 16
> +#define STEP_BMSK 0xffff
> +#define STEP_SHFT 0
> +
> +/* EMAC_EMAC_WRAPPER_CSR1 */
> +#define TX_INDX_FIFO_SYNC_RST 0x800000
> +#define TX_TS_FIFO_SYNC_RST 0x400000
> +#define RX_TS_FIFO2_SYNC_RST 0x200000
> +#define RX_TS_FIFO1_SYNC_RST 0x100000
> +#define TX_TS_ENABLE 0x10000
> +#define DIS_1588_CLKS 0x800
> +#define FREQ_MODE 0x200
> +#define ENABLE_RRD_TIMESTAMP 0x8
> +
> +/* EMAC_EMAC_WRAPPER_CSR2 */
> +#define HDRIVE_BMSK 0x3000
> +#define HDRIVE_SHFT 12
> +#define SLB_EN 0x200
> +#define PLB_EN 0x100
> +#define WOL_EN 0x80
> +#define PHY_RESET 0x1
> +
> +/* Device IDs */
> +#define EMAC_DEV_ID 0x0040
> +
> +/* 4 emac core irq and 1 wol irq */
> +#define EMAC_NUM_CORE_IRQ 4
> +#define EMAC_WOL_IRQ 4
> +#define EMAC_IRQ_CNT 5
> +/* mdio/mdc gpios */
> +#define EMAC_GPIO_CNT 2
> +
> +enum emac_clk_id {
> + EMAC_CLK_AXI,
> + EMAC_CLK_CFG_AHB,
> + EMAC_CLK_HIGH_SPEED,
> + EMAC_CLK_MDIO,
> + EMAC_CLK_TX,
> + EMAC_CLK_RX,
> + EMAC_CLK_SYS,
> + EMAC_CLK_CNT
> +};
> +
> +#define KHz(RATE) ((RATE) * 1000)
> +#define MHz(RATE) (KHz(RATE) * 1000)
> +
> +enum emac_clk_rate {
> + EMC_CLK_RATE_2_5MHZ = KHz(2500),
> + EMC_CLK_RATE_19_2MHZ = KHz(19200),
> + EMC_CLK_RATE_25MHZ = MHz(25),
> + EMC_CLK_RATE_125MHZ = MHz(125),
> +};
> +
> +#define EMAC_LINK_SPEED_UNKNOWN 0x0
> +#define EMAC_LINK_SPEED_10_HALF 0x0001
> +#define EMAC_LINK_SPEED_10_FULL 0x0002
> +#define EMAC_LINK_SPEED_100_HALF 0x0004
> +#define EMAC_LINK_SPEED_100_FULL 0x0008
> +#define EMAC_LINK_SPEED_1GB_FULL 0x0020
> +
> +#define EMAC_MAX_SETUP_LNK_CYCLE 100
> +
> +/* Wake On Lan */
> +#define EMAC_WOL_PHY 0x00000001 /* PHY Status Change */
> +#define EMAC_WOL_MAGIC 0x00000002 /* Magic Packet */
> +
> +struct emac_stats {
> + /* rx */
> + u64 rx_ok; /* good packets */
> + u64 rx_bcast; /* good broadcast packets */
> + u64 rx_mcast; /* good multicast packets */
> + u64 rx_pause; /* pause packet */
> + u64 rx_ctrl; /* control packets other than pause frame. */
> + u64 rx_fcs_err; /* packets with bad FCS. */
> + u64 rx_len_err; /* packets with length mismatch */
> + u64 rx_byte_cnt; /* good bytes count (without FCS) */
> + u64 rx_runt; /* runt packets */
> + u64 rx_frag; /* fragment count */
> + u64 rx_sz_64; /* packets that are 64 bytes */
> + u64 rx_sz_65_127; /* packets that are 65-127 bytes */
> + u64 rx_sz_128_255; /* packets that are 128-255 bytes */
> + u64 rx_sz_256_511; /* packets that are 256-511 bytes */
> + u64 rx_sz_512_1023; /* packets that are 512-1023 bytes */
> + u64 rx_sz_1024_1518; /* packets that are 1024-1518 bytes */
> + u64 rx_sz_1519_max; /* packets that are 1519-MTU bytes*/
> + u64 rx_sz_ov; /* packets that are >MTU bytes (truncated) */
> + u64 rx_rxf_ov; /* packets dropped due to RX FIFO overflow */
> + u64 rx_align_err; /* alignment errors */
> + u64 rx_bcast_byte_cnt; /* broadcast packets byte count (without FCS) */
> + u64 rx_mcast_byte_cnt; /* multicast packets byte count (without FCS) */
> + u64 rx_err_addr; /* packets dropped due to address filtering */
> + u64 rx_crc_align; /* CRC align errors */
> + u64 rx_jubbers; /* jubbers */
> +
> + /* tx */
> + u64 tx_ok; /* good packets */
> + u64 tx_bcast; /* good broadcast packets */
> + u64 tx_mcast; /* good multicast packets */
> + u64 tx_pause; /* pause packets */
> + u64 tx_exc_defer; /* packets with excessive deferral */
> + u64 tx_ctrl; /* control packets other than pause frame */
> + u64 tx_defer; /* packets that are deferred. */
> + u64 tx_byte_cnt; /* good bytes count (without FCS) */
> + u64 tx_sz_64; /* packets that are 64 bytes */
> + u64 tx_sz_65_127; /* packets that are 65-127 bytes */
> + u64 tx_sz_128_255; /* packets that are 128-255 bytes */
> + u64 tx_sz_256_511; /* packets that are 256-511 bytes */
> + u64 tx_sz_512_1023; /* packets that are 512-1023 bytes */
> + u64 tx_sz_1024_1518; /* packets that are 1024-1518 bytes */
> + u64 tx_sz_1519_max; /* packets that are 1519-MTU bytes */
> + u64 tx_1_col; /* packets single prior collision */
> + u64 tx_2_col; /* packets with multiple prior collisions */
> + u64 tx_late_col; /* packets with late collisions */
> + u64 tx_abort_col; /* packets aborted due to excess collisions */
> + u64 tx_underrun; /* packets aborted due to FIFO underrun */
> + u64 tx_rd_eop; /* count of reads beyond EOP */
> + u64 tx_len_err; /* packets with length mismatch */
> + u64 tx_trunc; /* packets truncated due to size >MTU */
> + u64 tx_bcast_byte; /* broadcast packets byte count (without FCS) */
> + u64 tx_mcast_byte; /* multicast packets byte count (without FCS) */
> + u64 tx_col; /* collisions */
> +};
> +
> +enum emac_status_bits {
> + EMAC_STATUS_PROMISC_EN,
> + EMAC_STATUS_VLANSTRIP_EN,
> + EMAC_STATUS_MULTIALL_EN,
> + EMAC_STATUS_LOOPBACK_EN,
> + EMAC_STATUS_TS_RX_EN,
> + EMAC_STATUS_TS_TX_EN,
> + EMAC_STATUS_RESETTING,
> + EMAC_STATUS_DOWN,
> + EMAC_STATUS_WATCH_DOG,
> + EMAC_STATUS_TASK_REINIT_REQ,
> + EMAC_STATUS_TASK_LSC_REQ,
> + EMAC_STATUS_TASK_CHK_SGMII_REQ,
> +};
> +
> +/* RSS hstype Definitions */
> +#define EMAC_RSS_HSTYP_IPV4_EN 0x00000001
> +#define EMAC_RSS_HSTYP_TCP4_EN 0x00000002
> +#define EMAC_RSS_HSTYP_IPV6_EN 0x00000004
> +#define EMAC_RSS_HSTYP_TCP6_EN 0x00000008
> +#define EMAC_RSS_HSTYP_ALL_EN (\
> + EMAC_RSS_HSTYP_IPV4_EN |\
> + EMAC_RSS_HSTYP_TCP4_EN |\
> + EMAC_RSS_HSTYP_IPV6_EN |\
> + EMAC_RSS_HSTYP_TCP6_EN)
> +
> +#define EMAC_VLAN_TO_TAG(_vlan, _tag) \
> + (_tag = ((((_vlan) >> 8) & 0xFF) | (((_vlan) & 0xFF) << 8)))
> +
> +#define EMAC_TAG_TO_VLAN(_tag, _vlan) \
> + (_vlan = ((((_tag) >> 8) & 0xFF) | (((_tag) & 0xFF) << 8)))
> +
> +#define EMAC_DEF_RX_BUF_SIZE 1536
> +#define EMAC_MAX_JUMBO_PKT_SIZE (9 * 1024)
> +#define EMAC_MAX_TX_OFFLOAD_THRESH (9 * 1024)
> +
> +#define EMAC_MAX_ETH_FRAME_SIZE EMAC_MAX_JUMBO_PKT_SIZE
> +#define EMAC_MIN_ETH_FRAME_SIZE 68
> +
> +#define EMAC_MAX_TX_QUEUES 4
> +#define EMAC_DEF_TX_QUEUES 1
> +#define EMAC_ACTIVE_TXQ 0
> +
> +#define EMAC_MAX_RX_QUEUES 4
> +#define EMAC_DEF_RX_QUEUES 1
> +
> +#define EMAC_MIN_TX_DESCS 128
> +#define EMAC_MIN_RX_DESCS 128
> +
> +#define EMAC_MAX_TX_DESCS 16383
> +#define EMAC_MAX_RX_DESCS 2047
> +
> +#define EMAC_DEF_TX_DESCS 512
> +#define EMAC_DEF_RX_DESCS 256
> +
> +#define EMAC_DEF_RX_IRQ_MOD 250
> +#define EMAC_DEF_TX_IRQ_MOD 250
> +
> +#define EMAC_WATCHDOG_TIME (5 * HZ)
> +
> +/* by default check link every 4 seconds */
> +#define EMAC_TRY_LINK_TIMEOUT (4 * HZ)
> +
> +/* emac_irq per-device (per-adapter) irq properties.
> + * @idx: index of this irq entry in the adapter irq array.
> + * @irq: irq number.
> + * @mask mask to use over status register.
> + */
> +struct emac_irq {
> + int idx;
> + unsigned int irq;
> + u32 mask;
> +};
> +
> +/* emac_irq_config irq properties which are common to all devices of this driver
> + * @name name in configuration (devicetree).
> + * @handler ISR.
> + * @status_reg status register offset.
> + * @mask_reg mask register offset.
> + * @init_mask initial value for mask to use over status register.
> + * @irqflags request_irq() flags.
> + */
> +struct emac_irq_config {
> + char *name;
> + irq_handler_t handler;
> +
> + u32 status_reg;
> + u32 mask_reg;
> + u32 init_mask;
> +
> + unsigned long irqflags;
> +};
> +
> +/* emac_irq_cfg_tbl a table of common irq properties to all devices of this
> + * driver.
> + */
> +extern const struct emac_irq_config emac_irq_cfg_tbl[];
> +
> +/* The device's main data structure */
> +struct emac_adapter {
> + struct net_device *netdev;
> +
> + void __iomem *base;
> + void __iomem *csr;
> +
> + struct emac_phy phy;
> + struct emac_stats stats;
> +
> + struct emac_irq irq[EMAC_IRQ_CNT];
> + unsigned int gpio[EMAC_GPIO_CNT];
> + struct clk *clk[EMAC_CLK_CNT];
> +
> + /* dma parameters */
> + u64 dma_mask;
> + struct device_dma_parameters dma_parms;
> +
> + /* All Descriptor memory */
> + struct emac_ring_header ring_header;
> + struct emac_tx_queue tx_q[EMAC_MAX_TX_QUEUES];
> + struct emac_rx_queue rx_q[EMAC_MAX_RX_QUEUES];
> + unsigned int tx_q_cnt;
> + unsigned int rx_q_cnt;
> + unsigned int tx_desc_cnt;
> + unsigned int rx_desc_cnt;
> + unsigned int rrd_size; /* in quad words */
> + unsigned int rfd_size; /* in quad words */
> + unsigned int tpd_size; /* in quad words */
> +
> + unsigned int rxbuf_size;
> +
> + u16 devid;
> + u16 revid;
> +
> + /* Ring parameter */
> + u8 tpd_burst;
> + u8 rfd_burst;
> + unsigned int dmaw_dly_cnt;
> + unsigned int dmar_dly_cnt;
> + enum emac_dma_req_block dmar_block;
> + enum emac_dma_req_block dmaw_block;
> + enum emac_dma_order dma_order;
> +
> + /* MAC parameter */
> + u8 mac_addr[ETH_ALEN];
> + u8 mac_perm_addr[ETH_ALEN];
> + u32 mtu;
> +
> + /* RSS parameter */
> + u8 rss_hstype;
> + u8 rss_base_cpu;
> + u16 rss_idt_size;
> + u32 rss_idt[32];
> + u8 rss_key[40];
> + bool rss_initialized;
> +
> + u32 irq_mod;
> + u32 preamble;
> +
> + /* Tx time-stamping queue */
> + struct sk_buff_head tx_ts_pending_queue;
> + struct sk_buff_head tx_ts_ready_queue;
> + struct work_struct tx_ts_task;
> + spinlock_t tx_ts_lock; /* Tx timestamp que lock */
> + struct emac_tx_ts_stats tx_ts_stats;
> +
> + struct work_struct work_thread;
> + struct timer_list timers;
> + unsigned long link_chk_timeout;
> +
> + bool timestamp_en;
> + u32 wol; /* Wake On Lan options */
> + u16 msg_enable;
> + unsigned long status;
> +};
> +
> +static inline struct emac_adapter *emac_irq_get_adpt(struct emac_irq *irq)
> +{
> + struct emac_irq *irq_0 = irq - irq->idx;
Blank link here, please
> + /* why using __builtin_offsetof() and not container_of() ?
> + * container_of(irq_0, struct emac_adapter, irq) fails to compile
> + * because emac->irq is of array type.
> + */
> + return (struct emac_adapter *)
> + ((char *)irq_0 - __builtin_offsetof(struct emac_adapter, irq));
> +}
> +
> +void emac_reinit_locked(struct emac_adapter *adpt);
> +void emac_work_thread_reschedule(struct emac_adapter *adpt);
> +void emac_lsc_schedule_check(struct emac_adapter *adpt);
> +void emac_rx_mode_set(struct net_device *netdev);
> +void emac_reg_update32(void __iomem *addr, u32 mask, u32 val);
> +
> +extern const char * const emac_gpio_name[];
> +
> +#endif /* _EMAC_H_ */
>
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