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Message-Id: <1330983641-32622-1-git-send-email-stigge@antcom.de>
Date: Mon, 5 Mar 2012 22:40:41 +0100
From: Roland Stigge <stigge@...com.de>
To: davem@...emloft.net, jeffrey.t.kirsher@...el.com,
alexander.h.duyck@...el.com, eilong@...adcom.com,
ian.campbell@...rix.com, netdev@...r.kernel.org,
w.sang@...gutronix.de, linux-kernel@...r.kernel.org,
kevin.wells@....com, linux-arm-kernel@...ts.infradead.org,
arnd@...db.de, baruch@...s.co.il, joe@...ches.com
Cc: Roland Stigge <stigge@...com.de>
Subject: [PATCH v4] lpc32xx: Added ethernet driver
This patch adds an ethernet driver for the LPC32xx ARM SoC.
Signed-off-by: Roland Stigge <stigge@...com.de>
---
Applies to v3.3-rc6
Changes since v3:
* Jiffies wraparound fix via msecs_to_jiffies() and time_after()
* Introduces symbolic names for status and control bits of descriptors
* Tx_errors counting only once at one event
* Use of_get_mac_address() and dev_hw_addr_random() to get/generate mac
address
* Merged lpc_eth.h into lpc_eth.c since it didn't share defs with other
C files
* Added interrupt handling via NAPI
* Removed net_region_start and net_region_size from struct netdata_local
* Removed (actually unused) platform_data
* Put LPC32XX_IRAM_* into another resource
* Use PAGE_ALIGN() for DMA size alignment
* Define suspend/resume conditionally
* Use module_platform_driver()
* Use correct pointer types (pointers, dma_addr_t, phys_addr_t) instead
of casts
Thanks to Arnd Bergmann, Ben Hutchings, David Miller, Kevin Wells,
Russell King and Joe Perches for reviewing!
drivers/net/ethernet/Kconfig | 1
drivers/net/ethernet/Makefile | 1
drivers/net/ethernet/nxp/Kconfig | 8
drivers/net/ethernet/nxp/Makefile | 1
drivers/net/ethernet/nxp/lpc_eth.c | 1642 +++++++++++++++++++++++++++++++++++++
5 files changed, 1653 insertions(+)
--- linux-2.6.orig/drivers/net/ethernet/Kconfig
+++ linux-2.6/drivers/net/ethernet/Kconfig
@@ -126,6 +126,7 @@ config NET_NETX
source "drivers/net/ethernet/nuvoton/Kconfig"
source "drivers/net/ethernet/nvidia/Kconfig"
+source "drivers/net/ethernet/nxp/Kconfig"
source "drivers/net/ethernet/octeon/Kconfig"
source "drivers/net/ethernet/oki-semi/Kconfig"
--- linux-2.6.orig/drivers/net/ethernet/Makefile
+++ linux-2.6/drivers/net/ethernet/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_NET_VENDOR_NATSEMI) += nats
obj-$(CONFIG_NET_NETX) += netx-eth.o
obj-$(CONFIG_NET_VENDOR_NUVOTON) += nuvoton/
obj-$(CONFIG_NET_VENDOR_NVIDIA) += nvidia/
+obj-$(CONFIG_LPC_ENET) += nxp/
obj-$(CONFIG_OCTEON_MGMT_ETHERNET) += octeon/
obj-$(CONFIG_NET_VENDOR_OKI) += oki-semi/
obj-$(CONFIG_ETHOC) += ethoc.o
--- /dev/null
+++ linux-2.6/drivers/net/ethernet/nxp/Kconfig
@@ -0,0 +1,8 @@
+config LPC_ENET
+ tristate "NXP ethernet MAC on LPC devices"
+ depends on ARCH_LPC32XX
+ select PHYLIB
+ help
+ Say Y or M here if you want to use the NXP ethernet MAC included on
+ some NXP LPC devices. You can safely enable this option for LPC32xx
+ SoC. Also available as a module.
--- /dev/null
+++ linux-2.6/drivers/net/ethernet/nxp/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_LPC_ENET) += lpc_eth.o
--- /dev/null
+++ linux-2.6/drivers/net/ethernet/nxp/lpc_eth.c
@@ -0,0 +1,1642 @@
+/*
+ * drivers/net/ethernet/nxp/lpc_eth.c
+ *
+ * Author: Kevin Wells <kevin.wells@....com>
+ *
+ * Copyright (C) 2010 NXP Semiconductors
+ * Copyright (C) 2012 Roland Stigge <stigge@...com.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/crc32.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/clk.h>
+#include <linux/workqueue.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/phy.h>
+#include <linux/dma-mapping.h>
+#include <linux/of_net.h>
+#include <linux/types.h>
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <mach/board.h>
+#include <mach/platform.h>
+#include <mach/hardware.h>
+
+#define MODNAME "lpc-eth"
+#define DRV_VERSION "1.00"
+#define PHYDEF_ADDR 0x00
+
+#define ENET_MAXF_SIZE 1536
+#define ENET_RX_DESC 48
+#define ENET_TX_DESC 16
+
+#define NAPI_WEIGHT 16
+
+/*
+ * Ethernet MAC controller Register offsets
+ */
+#define LPC_ENET_MAC1(x) (x + 0x000)
+#define LPC_ENET_MAC2(x) (x + 0x004)
+#define LPC_ENET_IPGT(x) (x + 0x008)
+#define LPC_ENET_IPGR(x) (x + 0x00C)
+#define LPC_ENET_CLRT(x) (x + 0x010)
+#define LPC_ENET_MAXF(x) (x + 0x014)
+#define LPC_ENET_SUPP(x) (x + 0x018)
+#define LPC_ENET_TEST(x) (x + 0x01C)
+#define LPC_ENET_MCFG(x) (x + 0x020)
+#define LPC_ENET_MCMD(x) (x + 0x024)
+#define LPC_ENET_MADR(x) (x + 0x028)
+#define LPC_ENET_MWTD(x) (x + 0x02C)
+#define LPC_ENET_MRDD(x) (x + 0x030)
+#define LPC_ENET_MIND(x) (x + 0x034)
+#define LPC_ENET_SA0(x) (x + 0x040)
+#define LPC_ENET_SA1(x) (x + 0x044)
+#define LPC_ENET_SA2(x) (x + 0x048)
+#define LPC_ENET_COMMAND(x) (x + 0x100)
+#define LPC_ENET_STATUS(x) (x + 0x104)
+#define LPC_ENET_RXDESCRIPTOR(x) (x + 0x108)
+#define LPC_ENET_RXSTATUS(x) (x + 0x10C)
+#define LPC_ENET_RXDESCRIPTORNUMBER(x) (x + 0x110)
+#define LPC_ENET_RXPRODUCEINDEX(x) (x + 0x114)
+#define LPC_ENET_RXCONSUMEINDEX(x) (x + 0x118)
+#define LPC_ENET_TXDESCRIPTOR(x) (x + 0x11C)
+#define LPC_ENET_TXSTATUS(x) (x + 0x120)
+#define LPC_ENET_TXDESCRIPTORNUMBER(x) (x + 0x124)
+#define LPC_ENET_TXPRODUCEINDEX(x) (x + 0x128)
+#define LPC_ENET_TXCONSUMEINDEX(x) (x + 0x12C)
+#define LPC_ENET_TSV0(x) (x + 0x158)
+#define LPC_ENET_TSV1(x) (x + 0x15C)
+#define LPC_ENET_RSV(x) (x + 0x160)
+#define LPC_ENET_FLOWCONTROLCOUNTER(x) (x + 0x170)
+#define LPC_ENET_FLOWCONTROLSTATUS(x) (x + 0x174)
+#define LPC_ENET_RXFILTER_CTRL(x) (x + 0x200)
+#define LPC_ENET_RXFILTERWOLSTATUS(x) (x + 0x204)
+#define LPC_ENET_RXFILTERWOLCLEAR(x) (x + 0x208)
+#define LPC_ENET_HASHFILTERL(x) (x + 0x210)
+#define LPC_ENET_HASHFILTERH(x) (x + 0x214)
+#define LPC_ENET_INTSTATUS(x) (x + 0xFE0)
+#define LPC_ENET_INTENABLE(x) (x + 0xFE4)
+#define LPC_ENET_INTCLEAR(x) (x + 0xFE8)
+#define LPC_ENET_INTSET(x) (x + 0xFEC)
+#define LPC_ENET_POWERDOWN(x) (x + 0xFF4)
+
+/*
+ * mac1 register definitions
+ */
+#define LPC_MAC1_RECV_ENABLE (1 << 0)
+#define LPC_MAC1_PASS_ALL_RX_FRAMES (1 << 1)
+#define LPC_MAC1_RX_FLOW_CONTROL (1 << 2)
+#define LPC_MAC1_TX_FLOW_CONTROL (1 << 3)
+#define LPC_MAC1_LOOPBACK (1 << 4)
+#define LPC_MAC1_RESET_TX (1 << 8)
+#define LPC_MAC1_RESET_MCS_TX (1 << 9)
+#define LPC_MAC1_RESET_RX (1 << 10)
+#define LPC_MAC1_RESET_MCS_RX (1 << 11)
+#define LPC_MAC1_SIMULATION_RESET (1 << 14)
+#define LPC_MAC1_SOFT_RESET (1 << 15)
+
+/*
+ * mac2 register definitions
+ */
+#define LPC_MAC2_FULL_DUPLEX (1 << 0)
+#define LPC_MAC2_FRAME_LENGTH_CHECKING (1 << 1)
+#define LPC_MAC2_HUGH_LENGTH_CHECKING (1 << 2)
+#define LPC_MAC2_DELAYED_CRC (1 << 3)
+#define LPC_MAC2_CRC_ENABLE (1 << 4)
+#define LPC_MAC2_PAD_CRC_ENABLE (1 << 5)
+#define LPC_MAC2_VLAN_PAD_ENABLE (1 << 6)
+#define LPC_MAC2_AUTO_DETECT_PAD_ENABLE (1 << 7)
+#define LPC_MAC2_PURE_PREAMBLE_ENFORCEMENT (1 << 8)
+#define LPC_MAC2_LONG_PREAMBLE_ENFORCEMENT (1 << 9)
+#define LPC_MAC2_NO_BACKOFF (1 << 12)
+#define LPC_MAC2_BACK_PRESSURE (1 << 13)
+#define LPC_MAC2_EXCESS_DEFER (1 << 14)
+
+/*
+ * ipgt register definitions
+ */
+#define LPC_IPGT_LOAD(n) ((n) & 0x7F)
+
+/*
+ * ipgr register definitions
+ */
+#define LPC_IPGR_LOAD_PART2(n) ((n) & 0x7F)
+#define LPC_IPGR_LOAD_PART1(n) (((n) & 0x7F) << 8)
+
+/*
+ * clrt register definitions
+ */
+#define LPC_CLRT_LOAD_RETRY_MAX(n) ((n) & 0xF)
+#define LPC_CLRT_LOAD_COLLISION_WINDOW(n) (((n) & 0x3F) << 8)
+
+/*
+ * maxf register definitions
+ */
+#define LPC_MAXF_LOAD_MAX_FRAME_LEN(n) ((n) & 0xFFFF)
+
+/*
+ * supp register definitions
+ */
+#define LPC_SUPP_SPEED (1 << 8)
+#define LPC_SUPP_RESET_RMII (1 << 11)
+
+/*
+ * test register definitions
+ */
+#define LPC_TEST_SHORTCUT_PAUSE_QUANTA (1 << 0)
+#define LPC_TEST_PAUSE (1 << 1)
+#define LPC_TEST_BACKPRESSURE (1 << 2)
+
+/*
+ * mcfg register definitions
+ */
+#define LPC_MCFG_SCAN_INCREMENT (1 << 0)
+#define LPC_MCFG_SUPPRESS_PREAMBLE (1 << 1)
+#define LPC_MCFG_CLOCK_SELECT(n) (((n) & 0x7) << 2)
+#define LPC_MCFG_CLOCK_HOST_DIV_4 0
+#define LPC_MCFG_CLOCK_HOST_DIV_6 2
+#define LPC_MCFG_CLOCK_HOST_DIV_8 3
+#define LPC_MCFG_CLOCK_HOST_DIV_10 4
+#define LPC_MCFG_CLOCK_HOST_DIV_14 5
+#define LPC_MCFG_CLOCK_HOST_DIV_20 6
+#define LPC_MCFG_CLOCK_HOST_DIV_28 7
+#define LPC_MCFG_RESET_MII_MGMT (1 << 15)
+
+/*
+ * mcmd register definitions
+ */
+#define LPC_MCMD_READ (1 << 0)
+#define LPC_MCMD_SCAN (1 << 1)
+
+/*
+ * madr register definitions
+ */
+#define LPC_MADR_REGISTER_ADDRESS(n) ((n) & 0x1F)
+#define LPC_MADR_PHY_0ADDRESS(n) (((n) & 0x1F) << 8)
+
+/*
+ * mwtd register definitions
+ */
+#define LPC_MWDT_WRITE(n) ((n) & 0xFFFF)
+
+/*
+ * mrdd register definitions
+ */
+#define LPC_MRDD_READ_MASK 0xFFFF
+
+/*
+ * mind register definitions
+ */
+#define LPC_MIND_BUSY (1 << 0)
+#define LPC_MIND_SCANNING (1 << 1)
+#define LPC_MIND_NOT_VALID (1 << 2)
+#define LPC_MIND_MII_LINK_FAIL (1 << 3)
+
+/*
+ * command register definitions
+ */
+#define LPC_COMMAND_RXENABLE (1 << 0)
+#define LPC_COMMAND_TXENABLE (1 << 1)
+#define LPC_COMMAND_REG_RESET (1 << 3)
+#define LPC_COMMAND_TXRESET (1 << 4)
+#define LPC_COMMAND_RXRESET (1 << 5)
+#define LPC_COMMAND_PASSRUNTFRAME (1 << 6)
+#define LPC_COMMAND_PASSRXFILTER (1 << 7)
+#define LPC_COMMAND_TXFLOWCONTROL (1 << 8)
+#define LPC_COMMAND_RMII (1 << 9)
+#define LPC_COMMAND_FULLDUPLEX (1 << 10)
+
+/*
+ * status register definitions
+ */
+#define LPC_STATUS_RXACTIVE (1 << 0)
+#define LPC_STATUS_TXACTIVE (1 << 1)
+
+/*
+ * tsv0 register definitions
+ */
+#define LPC_TSV0_CRC_ERROR (1 << 0)
+#define LPC_TSV0_LENGTH_CHECK_ERROR (1 << 1)
+#define LPC_TSV0_LENGTH_OUT_OF_RANGE (1 << 2)
+#define LPC_TSV0_DONE (1 << 3)
+#define LPC_TSV0_MULTICAST (1 << 4)
+#define LPC_TSV0_BROADCAST (1 << 5)
+#define LPC_TSV0_PACKET_DEFER (1 << 6)
+#define LPC_TSV0_ESCESSIVE_DEFER (1 << 7)
+#define LPC_TSV0_ESCESSIVE_COLLISION (1 << 8)
+#define LPC_TSV0_LATE_COLLISION (1 << 9)
+#define LPC_TSV0_GIANT (1 << 10)
+#define LPC_TSV0_UNDERRUN (1 << 11)
+#define LPC_TSV0_TOTAL_BYTES(n) (((n) >> 12) & 0xFFFF)
+#define LPC_TSV0_CONTROL_FRAME (1 << 28)
+#define LPC_TSV0_PAUSE (1 << 29)
+#define LPC_TSV0_BACKPRESSURE (1 << 30)
+#define LPC_TSV0_VLAN (1 << 31)
+
+/*
+ * tsv1 register definitions
+ */
+#define LPC_TSV1_TRANSMIT_BYTE_COUNT(n) ((n) & 0xFFFF)
+#define LPC_TSV1_COLLISION_COUNT(n) (((n) >> 16) & 0xF)
+
+/*
+ * rsv register definitions
+ */
+#define LPC_RSV_RECEIVED_BYTE_COUNT(n) ((n) & 0xFFFF)
+#define LPC_RSV_RXDV_EVENT_IGNORED (1 << 16)
+#define LPC_RSV_RXDV_EVENT_PREVIOUSLY_SEEN (1 << 17)
+#define LPC_RSV_CARRIER_EVNT_PREVIOUS_SEEN (1 << 18)
+#define LPC_RSV_RECEIVE_CODE_VIOLATION (1 << 19)
+#define LPC_RSV_CRC_ERROR (1 << 20)
+#define LPC_RSV_LENGTH_CHECK_ERROR (1 << 21)
+#define LPC_RSV_LENGTH_OUT_OF_RANGE (1 << 22)
+#define LPC_RSV_RECEIVE_OK (1 << 23)
+#define LPC_RSV_MULTICAST (1 << 24)
+#define LPC_RSV_BROADCAST (1 << 25)
+#define LPC_RSV_DRIBBLE_NIBBLE (1 << 26)
+#define LPC_RSV_CONTROL_FRAME (1 << 27)
+#define LPC_RSV_PAUSE (1 << 28)
+#define LPC_RSV_UNSUPPORTED_OPCODE (1 << 29)
+#define LPC_RSV_VLAN (1 << 30)
+
+/*
+ * flowcontrolcounter register definitions
+ */
+#define LPC_FCCR_MIRRORCOUNTER(n) ((n) & 0xFFFF)
+#define LPC_FCCR_PAUSETIMER(n) (((n) >> 16) & 0xFFFF)
+
+/*
+ * flowcontrolstatus register definitions
+ */
+#define LPC_FCCR_MIRRORCOUNTERCURRENT(n) ((n) & 0xFFFF)
+
+/*
+ * rxfliterctrl, rxfilterwolstatus, and rxfilterwolclear shared
+ * register definitions
+ */
+#define LPC_RXFLTRW_ACCEPTUNICAST (1 << 0)
+#define LPC_RXFLTRW_ACCEPTUBROADCAST (1 << 1)
+#define LPC_RXFLTRW_ACCEPTUMULTICAST (1 << 2)
+#define LPC_RXFLTRW_ACCEPTUNICASTHASH (1 << 3)
+#define LPC_RXFLTRW_ACCEPTUMULTICASTHASH (1 << 4)
+#define LPC_RXFLTRW_ACCEPTPERFECT (1 << 5)
+
+/*
+ * rxfliterctrl register definitions
+ */
+#define LPC_RXFLTRWSTS_MAGICPACKETENWOL (1 << 12)
+#define LPC_RXFLTRWSTS_RXFILTERENWOL (1 << 13)
+
+/*
+ * rxfilterwolstatus/rxfilterwolclear register definitions
+ */
+#define LPC_RXFLTRWSTS_RXFILTERWOL (1 << 7)
+#define LPC_RXFLTRWSTS_MAGICPACKETWOL (1 << 8)
+
+/*
+ * intstatus, intenable, intclear, and Intset shared register
+ * definitions
+ */
+#define LPC_MACINT_RXOVERRUNINTEN (1 << 0)
+#define LPC_MACINT_RXERRORONINT (1 << 1)
+#define LPC_MACINT_RXFINISHEDINTEN (1 << 2)
+#define LPC_MACINT_RXDONEINTEN (1 << 3)
+#define LPC_MACINT_TXUNDERRUNINTEN (1 << 4)
+#define LPC_MACINT_TXERRORINTEN (1 << 5)
+#define LPC_MACINT_TXFINISHEDINTEN (1 << 6)
+#define LPC_MACINT_TXDONEINTEN (1 << 7)
+#define LPC_MACINT_SOFTINTEN (1 << 12)
+#define LPC_MACINT_WAKEUPINTEN (1 << 13)
+
+/*
+ * powerdown register definitions
+ */
+#define LPC_POWERDOWN_MACAHB (1 << 31)
+
+static inline phy_interface_t lpc_phy_interface_mode(void)
+{
+#ifdef CONFIG_ARCH_LPC32XX_MII_SUPPORT
+ return PHY_INTERFACE_MODE_MII;
+#else
+ return PHY_INTERFACE_MODE_RMII;
+#endif
+}
+
+static inline int use_iram_for_net(void)
+{
+#ifdef CONFIG_ARCH_LPC32XX_IRAM_FOR_NET
+ return 1;
+#else
+ return 0;
+#endif
+}
+
+/* Receive Status information word */
+#define RXSTATUS_SIZE 0x000007FF
+#define RXSTATUS_CONTROL (1 << 18)
+#define RXSTATUS_VLAN (1 << 19)
+#define RXSTATUS_FILTER (1 << 20)
+#define RXSTATUS_MULTICAST (1 << 21)
+#define RXSTATUS_BROADCAST (1 << 22)
+#define RXSTATUS_CRC (1 << 23)
+#define RXSTATUS_SYMBOL (1 << 24)
+#define RXSTATUS_LENGTH (1 << 25)
+#define RXSTATUS_RANGE (1 << 26)
+#define RXSTATUS_ALIGN (1 << 27)
+#define RXSTATUS_OVERRUN (1 << 28)
+#define RXSTATUS_NODESC (1 << 29)
+#define RXSTATUS_LAST (1 << 30)
+#define RXSTATUS_ERROR (1 << 31)
+
+#define RXSTATUS_STATUS_ERROR \
+ (RXSTATUS_NODESC | RXSTATUS_OVERRUN | RXSTATUS_ALIGN | RXSTATUS_RANGE \
+ | RXSTATUS_LENGTH | RXSTATUS_SYMBOL | RXSTATUS_CRC)
+
+/* Receive Descriptor control word */
+#define RXDESC_CONTROL_SIZE 0x000007FF
+#define RXDESC_CONTROL_INT (1 << 31)
+
+/* Transmit Status information word */
+#define TXSTATUS_COLLISIONS_GET(x) (((x) >> 21) & 0xF)
+#define TXSTATUS_DEFER (1 << 25)
+#define TXSTATUS_EXCESSDEFER (1 << 26)
+#define TXSTATUS_EXCESSCOLL (1 << 27)
+#define TXSTATUS_LATECOLL (1 << 28)
+#define TXSTATUS_UNDERRUN (1 << 29)
+#define TXSTATUS_NODESC (1 << 30)
+#define TXSTATUS_ERROR (1 << 31)
+
+/* Transmit Descriptor control word */
+#define TXDESC_CONTROL_SIZE 0x000007FF
+#define TXDESC_CONTROL_OVERRIDE (1 << 26)
+#define TXDESC_CONTROL_HUGE (1 << 27)
+#define TXDESC_CONTROL_PAD (1 << 28)
+#define TXDESC_CONTROL_CRC (1 << 29)
+#define TXDESC_CONTROL_LAST (1 << 30)
+#define TXDESC_CONTROL_INT (1 << 31)
+
+static int lpc_eth_hard_start_xmit(struct sk_buff *skb,
+ struct net_device *ndev);
+
+/*
+ * Transmit timeout, default 2.5 seconds.
+ */
+static int watchdog = 2500;
+module_param(watchdog, int, 0400);
+MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");
+
+/*
+ * Structure of a TX/RX descriptors and RX status
+ */
+struct txrx_desc_t {
+ volatile u32 packet;
+ volatile u32 control;
+};
+struct rx_status_t {
+ volatile u32 statusinfo;
+ volatile u32 statushashcrc;
+};
+
+/*
+ * Device driver data structure
+ */
+struct netdata_local {
+ struct platform_device *pdev;
+ struct net_device *ndev;
+ spinlock_t lock;
+ void __iomem *net_base;
+ u32 msg_enable;
+ struct sk_buff *skb[ENET_TX_DESC];
+ unsigned int last_tx_idx;
+ unsigned int num_used_tx_buffs;
+ struct mii_bus *mii_bus;
+ struct phy_device *phy_dev;
+ struct clk *clk;
+ dma_addr_t dma_buff_base_p;
+ void *dma_buff_base_v;
+ size_t dma_buff_size;
+ struct txrx_desc_t *tx_desc_v[ENET_TX_DESC];
+ u32 *tx_stat_v[ENET_TX_DESC];
+ void *tx_buff_v[ENET_TX_DESC];
+ struct txrx_desc_t *rx_desc_v[ENET_RX_DESC];
+ struct rx_status_t *rx_stat_v[ENET_RX_DESC];
+ void *rx_buff_v[ENET_RX_DESC];
+ int link;
+ int speed;
+ int duplex;
+ struct napi_struct napi;
+};
+
+/*
+ * MAC support functions
+ */
+static void __lpc_set_mac(struct netdata_local *pldat, u8 *mac)
+{
+ u32 tmp;
+
+ /* Set station address */
+ tmp = mac[0] | ((u32)mac[1] << 8);
+ writel(tmp, LPC_ENET_SA2(pldat->net_base));
+ tmp = mac[2] | ((u32)mac[3] << 8);
+ writel(tmp, LPC_ENET_SA1(pldat->net_base));
+ tmp = mac[4] | ((u32)mac[5] << 8);
+ writel(tmp, LPC_ENET_SA0(pldat->net_base));
+
+ netdev_dbg(pldat->ndev, "Ethernet MAC address %pM\n", mac);
+}
+
+static void __lpc_get_mac(struct netdata_local *pldat, u8 *mac)
+{
+ u32 tmp;
+
+ /* Get station address */
+ tmp = readl(LPC_ENET_SA2(pldat->net_base));
+ mac[0] = tmp & 0xFF;
+ mac[1] = tmp >> 8;
+ tmp = readl(LPC_ENET_SA1(pldat->net_base));
+ mac[2] = tmp & 0xFF;
+ mac[3] = tmp >> 8;
+ tmp = readl(LPC_ENET_SA0(pldat->net_base));
+ mac[4] = tmp & 0xFF;
+ mac[5] = tmp >> 8;
+}
+
+static void __lpc_eth_clock_enable(struct netdata_local *pldat,
+ int enable)
+{
+ if (enable)
+ clk_enable(pldat->clk);
+ else
+ clk_disable(pldat->clk);
+}
+
+static void __lpc_params_setup(struct netdata_local *pldat)
+{
+ u32 tmp;
+
+ if (pldat->duplex == DUPLEX_FULL) {
+ tmp = readl(LPC_ENET_MAC2(pldat->net_base));
+ tmp |= LPC_MAC2_FULL_DUPLEX;
+ writel(tmp, LPC_ENET_MAC2(pldat->net_base));
+ tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
+ tmp |= LPC_COMMAND_FULLDUPLEX;
+ writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
+ writel(LPC_IPGT_LOAD(0x15), LPC_ENET_IPGT(pldat->net_base));
+ } else {
+ tmp = readl(LPC_ENET_MAC2(pldat->net_base));
+ tmp &= ~LPC_MAC2_FULL_DUPLEX;
+ writel(tmp, LPC_ENET_MAC2(pldat->net_base));
+ tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
+ tmp &= ~LPC_COMMAND_FULLDUPLEX;
+ writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
+ writel(LPC_IPGT_LOAD(0x12), LPC_ENET_IPGT(pldat->net_base));
+ }
+
+ if (pldat->speed == SPEED_100)
+ writel(LPC_SUPP_SPEED, LPC_ENET_SUPP(pldat->net_base));
+ else
+ writel(0, LPC_ENET_SUPP(pldat->net_base));
+}
+
+static void __lpc_eth_reset(struct netdata_local *pldat)
+{
+ /* Reset all MAC logic */
+ writel((LPC_MAC1_RESET_TX | LPC_MAC1_RESET_MCS_TX | LPC_MAC1_RESET_RX |
+ LPC_MAC1_RESET_MCS_RX | LPC_MAC1_SIMULATION_RESET |
+ LPC_MAC1_SOFT_RESET), LPC_ENET_MAC1(pldat->net_base));
+ writel((LPC_COMMAND_REG_RESET | LPC_COMMAND_TXRESET |
+ LPC_COMMAND_RXRESET), LPC_ENET_COMMAND(pldat->net_base));
+}
+
+static int __lpc_mii_mngt_reset(struct netdata_local *pldat)
+{
+ /* Reset MII management hardware */
+ writel(LPC_MCFG_RESET_MII_MGMT, LPC_ENET_MCFG(pldat->net_base));
+
+ /* Setup MII clock to slowest rate with a /28 divider */
+ writel(LPC_MCFG_CLOCK_SELECT(LPC_MCFG_CLOCK_HOST_DIV_28),
+ LPC_ENET_MCFG(pldat->net_base));
+
+ return 0;
+}
+
+static inline phys_addr_t __va_to_pa(void *addr, struct netdata_local *pldat)
+{
+ phys_addr_t phaddr;
+
+ phaddr = addr - pldat->dma_buff_base_v;
+ phaddr += pldat->dma_buff_base_p;
+
+ return phaddr;
+}
+
+static void lpc_eth_enable_int(void __iomem *regbase)
+{
+ writel((LPC_MACINT_RXDONEINTEN | LPC_MACINT_TXDONEINTEN),
+ LPC_ENET_INTENABLE(regbase));
+}
+
+static void lpc_eth_disable_int(void __iomem *regbase)
+{
+ writel(0, LPC_ENET_INTENABLE(regbase));
+}
+
+/* Setup TX/RX descriptors */
+static void __lpc_txrx_desc_setup(struct netdata_local *pldat)
+{
+ u32 *ptxstat;
+ void *tbuff;
+ int i;
+ struct txrx_desc_t *ptxrxdesc;
+ struct rx_status_t *prxstat;
+
+ tbuff = PTR_ALIGN(pldat->dma_buff_base_v, 4);
+
+ /* Setup TX descriptors, status, and buffers */
+ for (i = 0; i < ENET_TX_DESC; i++) {
+ pldat->tx_desc_v[i] = tbuff;
+ tbuff += sizeof(struct txrx_desc_t);
+ }
+ for (i = 0; i < ENET_TX_DESC; i++) {
+ pldat->tx_stat_v[i] = tbuff;
+ tbuff += sizeof(u32);
+ }
+ tbuff = PTR_ALIGN(tbuff, 4);
+ for (i = 0; i < ENET_TX_DESC; i++) {
+ pldat->tx_buff_v[i] = tbuff;
+ tbuff += ENET_MAXF_SIZE;
+ }
+
+ /* Setup RX descriptors, status, and buffers */
+ for (i = 0; i < ENET_RX_DESC; i++) {
+ pldat->rx_desc_v[i] = tbuff;
+ tbuff += sizeof(struct txrx_desc_t);
+ }
+ tbuff = PTR_ALIGN(tbuff, 4);
+ for (i = 0; i < ENET_RX_DESC; i++) {
+ pldat->rx_stat_v[i] = tbuff;
+ tbuff += sizeof(struct rx_status_t);
+ }
+ tbuff = PTR_ALIGN(tbuff, 4);
+ for (i = 0; i < ENET_RX_DESC; i++) {
+ pldat->rx_buff_v[i] = tbuff;
+ tbuff += ENET_MAXF_SIZE;
+ }
+
+ /* Map the TX descriptors to the TX buffers in hardware */
+ for (i = 0; i < ENET_TX_DESC; i++) {
+ ptxstat = pldat->tx_stat_v[i];
+ ptxrxdesc = pldat->tx_desc_v[i];
+
+ ptxrxdesc->packet = __va_to_pa(pldat->tx_buff_v[i], pldat);
+ ptxrxdesc->control = 0;
+ *ptxstat = 0;
+ }
+
+ /* Map the RX descriptors to the RX buffers in hardware */
+ for (i = 0; i < ENET_RX_DESC; i++) {
+ prxstat = pldat->rx_stat_v[i];
+ ptxrxdesc = pldat->rx_desc_v[i];
+
+ ptxrxdesc->packet = __va_to_pa(pldat->rx_buff_v[i], pldat);
+ ptxrxdesc->control = RXDESC_CONTROL_INT | (ENET_MAXF_SIZE - 1);
+ prxstat->statusinfo = 0;
+ prxstat->statushashcrc = 0;
+ }
+
+ /* Setup base addresses in hardware to point to buffers and
+ descriptors */
+ writel((ENET_TX_DESC - 1),
+ LPC_ENET_TXDESCRIPTORNUMBER(pldat->net_base));
+ writel(__va_to_pa(pldat->tx_desc_v[0], pldat),
+ LPC_ENET_TXDESCRIPTOR(pldat->net_base));
+ writel(__va_to_pa(pldat->tx_stat_v[0], pldat),
+ LPC_ENET_TXSTATUS(pldat->net_base));
+ writel((ENET_RX_DESC - 1),
+ LPC_ENET_RXDESCRIPTORNUMBER(pldat->net_base));
+ writel(__va_to_pa(pldat->rx_desc_v[0], pldat),
+ LPC_ENET_RXDESCRIPTOR(pldat->net_base));
+ writel(__va_to_pa(pldat->rx_stat_v[0], pldat),
+ LPC_ENET_RXSTATUS(pldat->net_base));
+}
+
+static void __lpc_eth_init(struct netdata_local *pldat)
+{
+ u32 tmp;
+
+ /* Disable controller and reset */
+ tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
+ tmp &= ~LPC_COMMAND_RXENABLE | LPC_COMMAND_TXENABLE;
+ writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
+ tmp = readl(LPC_ENET_MAC1(pldat->net_base));
+ tmp &= ~LPC_MAC1_RECV_ENABLE;
+ writel(tmp, LPC_ENET_MAC1(pldat->net_base));
+
+ /* Initial MAC setup */
+ writel(LPC_MAC1_PASS_ALL_RX_FRAMES, LPC_ENET_MAC1(pldat->net_base));
+ writel((LPC_MAC2_PAD_CRC_ENABLE | LPC_MAC2_CRC_ENABLE),
+ LPC_ENET_MAC2(pldat->net_base));
+ writel(ENET_MAXF_SIZE, LPC_ENET_MAXF(pldat->net_base));
+
+ /* Collision window, gap */
+ writel((LPC_CLRT_LOAD_RETRY_MAX(0xF) |
+ LPC_CLRT_LOAD_COLLISION_WINDOW(0x37)),
+ LPC_ENET_CLRT(pldat->net_base));
+ writel(LPC_IPGR_LOAD_PART2(0x12), LPC_ENET_IPGR(pldat->net_base));
+
+ if (lpc_phy_interface_mode() == PHY_INTERFACE_MODE_MII)
+ writel(LPC_COMMAND_PASSRUNTFRAME,
+ LPC_ENET_COMMAND(pldat->net_base));
+ else {
+ writel((LPC_COMMAND_PASSRUNTFRAME | LPC_COMMAND_RMII),
+ LPC_ENET_COMMAND(pldat->net_base));
+ writel(LPC_SUPP_RESET_RMII, LPC_ENET_SUPP(pldat->net_base));
+ }
+
+ __lpc_params_setup(pldat);
+
+ /* Setup TX and RX descriptors */
+ __lpc_txrx_desc_setup(pldat);
+
+ /* Setup packet filtering */
+ writel((LPC_RXFLTRW_ACCEPTUBROADCAST | LPC_RXFLTRW_ACCEPTPERFECT),
+ LPC_ENET_RXFILTER_CTRL(pldat->net_base));
+
+ /* Clear and enable interrupts */
+ writel(0xFFFF, LPC_ENET_INTCLEAR(pldat->net_base));
+ lpc_eth_enable_int(pldat->net_base);
+
+ /* Get the next TX buffer output index */
+ pldat->num_used_tx_buffs = 0;
+ pldat->last_tx_idx =
+ readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
+
+ /* Enable controller */
+ tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
+ tmp |= LPC_COMMAND_RXENABLE | LPC_COMMAND_TXENABLE;
+ writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
+ tmp = readl(LPC_ENET_MAC1(pldat->net_base));
+ tmp |= LPC_MAC1_RECV_ENABLE;
+ writel(tmp, LPC_ENET_MAC1(pldat->net_base));
+}
+
+static void __lpc_eth_shutdown(struct netdata_local *pldat)
+{
+ /* Reset ethernet and power down PHY */
+ __lpc_eth_reset(pldat);
+ writel(0, LPC_ENET_MAC1(pldat->net_base));
+ writel(0, LPC_ENET_MAC2(pldat->net_base));
+}
+
+/*
+ * MAC<--->PHY support functions
+ */
+static int lpc_mdio_read(struct mii_bus *bus, int phy_id, int phyreg)
+{
+ struct netdata_local *pldat = bus->priv;
+ unsigned long timeout = jiffies + msecs_to_jiffies(100);
+ int lps;
+
+ writel(((phy_id << 8) | phyreg), LPC_ENET_MADR(pldat->net_base));
+ writel(LPC_MCMD_READ, LPC_ENET_MCMD(pldat->net_base));
+
+ /* Wait for unbusy status */
+ while (readl(LPC_ENET_MIND(pldat->net_base)) & LPC_MIND_BUSY) {
+ if (time_after(jiffies, timeout))
+ return -EIO;
+ cpu_relax();
+ }
+
+ lps = readl(LPC_ENET_MRDD(pldat->net_base));
+ writel(0, LPC_ENET_MCMD(pldat->net_base));
+
+ return lps;
+}
+
+static int lpc_mdio_write(struct mii_bus *bus, int phy_id, int phyreg,
+ u16 phydata)
+{
+ struct netdata_local *pldat = bus->priv;
+ unsigned long timeout = jiffies + msecs_to_jiffies(100);
+
+ writel(((phy_id << 8) | phyreg), LPC_ENET_MADR(pldat->net_base));
+ writel(phydata, LPC_ENET_MWTD(pldat->net_base));
+
+ /* Wait for completion */
+ while (readl(LPC_ENET_MIND(pldat->net_base)) & LPC_MIND_BUSY) {
+ if (time_after(jiffies, timeout))
+ return -EIO;
+ cpu_relax();
+ }
+
+ return 0;
+}
+
+static int lpc_mdio_reset(struct mii_bus *bus)
+{
+ return __lpc_mii_mngt_reset((struct netdata_local *)bus->priv);
+}
+
+static void lpc_handle_link_change(struct net_device *ndev)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+ struct phy_device *phydev = pldat->phy_dev;
+ unsigned long flags;
+
+ int status_change = 0;
+
+ spin_lock_irqsave(&pldat->lock, flags);
+
+ if (phydev->link) {
+ if ((pldat->speed != phydev->speed) ||
+ (pldat->duplex != phydev->duplex)) {
+ pldat->speed = phydev->speed;
+ pldat->duplex = phydev->duplex;
+ status_change = 1;
+ }
+ }
+
+ if (phydev->link != pldat->link) {
+ if (!phydev->link) {
+ pldat->speed = 0;
+ pldat->duplex = -1;
+ }
+ pldat->link = phydev->link;
+
+ status_change = 1;
+ }
+
+ spin_unlock_irqrestore(&pldat->lock, flags);
+
+ if (status_change)
+ __lpc_params_setup(pldat);
+}
+
+static int lpc_mii_probe(struct net_device *ndev)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+ struct phy_device *phydev = NULL;
+ int phy_addr;
+
+ /* find the first phy */
+ for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
+ if (pldat->mii_bus->phy_map[phy_addr]) {
+ phydev = pldat->mii_bus->phy_map[phy_addr];
+ break;
+ }
+ }
+
+ if (!phydev) {
+ netdev_err(ndev, "no PHY found\n");
+ return -ENODEV;
+ }
+
+ /* Attach to the PHY */
+ if (lpc_phy_interface_mode() == PHY_INTERFACE_MODE_MII)
+ netdev_info(ndev, "using MII interface\n");
+ else
+ netdev_info(ndev, "using RMII interface\n");
+ phydev = phy_connect(ndev, dev_name(&phydev->dev),
+ &lpc_handle_link_change, 0, lpc_phy_interface_mode());
+
+ if (IS_ERR(phydev)) {
+ netdev_err(ndev, "Could not attach to PHY\n");
+ return PTR_ERR(phydev);
+ }
+
+ /* mask with MAC supported features */
+ phydev->supported &= PHY_BASIC_FEATURES;
+
+ phydev->advertising = phydev->supported;
+
+ pldat->link = 0;
+ pldat->speed = 0;
+ pldat->duplex = -1;
+ pldat->phy_dev = phydev;
+
+ return 0;
+}
+
+static int lpc_mii_init(struct netdata_local *pldat)
+{
+ int err = -ENXIO, i;
+
+ pldat->mii_bus = mdiobus_alloc();
+ if (!pldat->mii_bus) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ /* Setup MII mode */
+ if (lpc_phy_interface_mode() == PHY_INTERFACE_MODE_MII)
+ writel(LPC_COMMAND_PASSRUNTFRAME,
+ LPC_ENET_COMMAND(pldat->net_base));
+ else {
+ writel((LPC_COMMAND_PASSRUNTFRAME | LPC_COMMAND_RMII),
+ LPC_ENET_COMMAND(pldat->net_base));
+ writel(LPC_SUPP_RESET_RMII, LPC_ENET_SUPP(pldat->net_base));
+ }
+
+ pldat->mii_bus->name = "lpc_mii_bus";
+ pldat->mii_bus->read = &lpc_mdio_read;
+ pldat->mii_bus->write = &lpc_mdio_write;
+ pldat->mii_bus->reset = &lpc_mdio_reset;
+ snprintf(pldat->mii_bus->id, MII_BUS_ID_SIZE, "%x", pldat->pdev->id);
+ pldat->mii_bus->priv = pldat;
+ pldat->mii_bus->parent = &pldat->pdev->dev;
+ pldat->mii_bus->phy_mask = 0xFFFFFFF0;
+
+ pldat->mii_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
+ if (!pldat->mii_bus->irq) {
+ err = -ENOMEM;
+ goto err_out_1;
+ }
+
+ for (i = 0; i < PHY_MAX_ADDR; i++)
+ pldat->mii_bus->irq[i] = PHY_POLL;
+
+ platform_set_drvdata(pldat->pdev, pldat->mii_bus);
+
+ if (mdiobus_register(pldat->mii_bus))
+ goto err_out_free_mdio_irq;
+
+ if (lpc_mii_probe(pldat->ndev) != 0)
+ goto err_out_unregister_bus;
+
+ return 0;
+
+err_out_unregister_bus:
+ mdiobus_unregister(pldat->mii_bus);
+err_out_free_mdio_irq:
+ kfree(pldat->mii_bus->irq);
+err_out_1:
+ mdiobus_free(pldat->mii_bus);
+err_out:
+ return err;
+}
+
+static void __lpc_handle_xmit(struct net_device *ndev)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+ struct sk_buff *skb;
+ u32 txcidx, *ptxstat, txstat;
+
+ txcidx = readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
+ while (pldat->last_tx_idx != txcidx) {
+ skb = pldat->skb[pldat->last_tx_idx];
+
+ /* A buffer is available, get buffer status */
+ ptxstat = pldat->tx_stat_v[pldat->last_tx_idx];
+ txstat = *ptxstat;
+
+ /* Next buffer and decrement used buffer counter */
+ pldat->num_used_tx_buffs--;
+ pldat->last_tx_idx++;
+ if (pldat->last_tx_idx >= ENET_TX_DESC)
+ pldat->last_tx_idx = 0;
+
+ /* Update collision counter */
+ ndev->stats.collisions += TXSTATUS_COLLISIONS_GET(txstat);
+
+ /* Any errors occurred? */
+ if (txstat & TXSTATUS_ERROR) {
+ if (txstat & TXSTATUS_UNDERRUN) {
+ /* FIFO underrun */
+ ndev->stats.tx_fifo_errors++;
+ }
+ if (txstat & TXSTATUS_LATECOLL) {
+ /* Late collision */
+ ndev->stats.tx_aborted_errors++;
+ }
+ if (txstat & TXSTATUS_EXCESSCOLL) {
+ /* Excessive collision */
+ ndev->stats.tx_aborted_errors++;
+ }
+ if (txstat & TXSTATUS_EXCESSDEFER) {
+ /* Defer limit */
+ ndev->stats.tx_aborted_errors++;
+ }
+ ndev->stats.tx_errors++;
+
+ /* Buffer transmit failed, requeue it */
+ lpc_eth_hard_start_xmit(skb, ndev);
+ } else {
+ /* Update stats */
+ ndev->stats.tx_packets++;
+ ndev->stats.tx_bytes += skb->len;
+
+ /* Free buffer */
+ dev_kfree_skb_irq(skb);
+ }
+
+ txcidx = readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
+ }
+
+ if (netif_queue_stopped(ndev))
+ netif_wake_queue(ndev);
+}
+
+static int __lpc_handle_recv(struct net_device *ndev, int budget)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+ struct sk_buff *skb;
+ u32 rxconsidx, len, ethst;
+ struct rx_status_t *prxstat;
+ u8 *prdbuf;
+ int rx_done = 0;
+
+ /* Get the current RX buffer indexes */
+ rxconsidx = readl(LPC_ENET_RXCONSUMEINDEX(pldat->net_base));
+ while (rx_done < budget && rxconsidx !=
+ readl(LPC_ENET_RXPRODUCEINDEX(pldat->net_base))) {
+ /* Get pointer to receive status */
+ prxstat = pldat->rx_stat_v[rxconsidx];
+ len = (prxstat->statusinfo & RXSTATUS_SIZE) + 1;
+
+ /* Status error? */
+ ethst = prxstat->statusinfo;
+ if ((ethst & (RXSTATUS_ERROR | RXSTATUS_STATUS_ERROR)) ==
+ (RXSTATUS_ERROR | RXSTATUS_RANGE))
+ ethst &= ~RXSTATUS_ERROR;
+
+ if (ethst & RXSTATUS_ERROR) {
+ int si = prxstat->statusinfo;
+ /* Check statuses */
+ if (si & RXSTATUS_OVERRUN) {
+ /* Overrun error */
+ ndev->stats.rx_fifo_errors++;
+ } else if (si & RXSTATUS_CRC) {
+ /* CRC error */
+ ndev->stats.rx_crc_errors++;
+ } else if (si & RXSTATUS_LENGTH) {
+ /* Length error */
+ ndev->stats.rx_length_errors++;
+ } else if (si & RXSTATUS_ERROR) {
+ /* Other error */
+ ndev->stats.rx_length_errors++;
+ }
+ ndev->stats.rx_errors++;
+ } else {
+ /* Packet is good */
+ skb = dev_alloc_skb(len + 8);
+ if (!skb)
+ ndev->stats.rx_dropped++;
+ else {
+ skb_reserve(skb, 8);
+ prdbuf = skb_put(skb, (len - 0));
+
+ /* Copy packet from buffer */
+ memcpy(prdbuf,
+ pldat->rx_buff_v[rxconsidx], len);
+
+ /* Pass to upper layer */
+ skb->protocol = eth_type_trans(skb, ndev);
+ netif_rx(skb);
+ ndev->last_rx = jiffies;
+ ndev->stats.rx_packets++;
+ ndev->stats.rx_bytes += len;
+ }
+ }
+
+ /* Increment consume index */
+ rxconsidx = rxconsidx + 1;
+ if (rxconsidx >= ENET_RX_DESC)
+ rxconsidx = 0;
+ writel((u32)rxconsidx,
+ LPC_ENET_RXCONSUMEINDEX(pldat->net_base));
+ rx_done++;
+ }
+
+ return rx_done;
+}
+
+static int lpc_eth_poll(struct napi_struct *napi, int budget)
+{
+ struct netdata_local *pldat = container_of(napi,
+ struct netdata_local, napi);
+ struct net_device *ndev = pldat->ndev;
+ unsigned long flags;
+ int rx_done = 0;
+
+ spin_lock_irqsave(&pldat->lock, flags);
+
+ __lpc_handle_xmit(ndev);
+ rx_done = __lpc_handle_recv(ndev, budget);
+
+ if (rx_done < budget) {
+ napi_complete(napi);
+ lpc_eth_enable_int(pldat->net_base);
+ }
+
+ spin_unlock_irqrestore(&pldat->lock, flags);
+
+ return rx_done;
+}
+
+static irqreturn_t __lpc_eth_interrupt(int irq, void *dev_id)
+{
+ struct net_device *ndev = dev_id;
+ struct netdata_local *pldat = netdev_priv(ndev);
+ u32 tmp;
+
+ spin_lock(&pldat->lock);
+
+ tmp = readl(LPC_ENET_INTSTATUS(pldat->net_base));
+ /* Clear interrupts */
+ writel(tmp, LPC_ENET_INTCLEAR(pldat->net_base));
+
+ if (likely(napi_schedule_prep(&pldat->napi))) {
+ lpc_eth_disable_int(pldat->net_base);
+ __napi_schedule(&pldat->napi);
+ }
+
+ spin_unlock(&pldat->lock);
+
+ return IRQ_HANDLED;
+}
+
+static int lpc_eth_close(struct net_device *ndev)
+{
+ unsigned long flags;
+ struct netdata_local *pldat = netdev_priv(ndev);
+
+ if (netif_msg_ifdown(pldat))
+ dev_dbg(&pldat->pdev->dev, "shutting down %s\n", ndev->name);
+
+ napi_disable(&pldat->napi);
+ netif_stop_queue(ndev);
+
+ if (pldat->phy_dev)
+ phy_stop(pldat->phy_dev);
+
+ spin_lock_irqsave(&pldat->lock, flags);
+ __lpc_eth_reset(pldat);
+ netif_carrier_off(ndev);
+ writel(0, LPC_ENET_MAC1(pldat->net_base));
+ writel(0, LPC_ENET_MAC2(pldat->net_base));
+ spin_unlock_irqrestore(&pldat->lock, flags);
+
+ __lpc_eth_clock_enable(pldat, 0);
+
+ return 0;
+}
+
+static int lpc_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+ u32 len, txidx;
+ u32 *ptxstat;
+ struct txrx_desc_t *ptxrxdesc;
+
+ len = skb->len;
+
+ spin_lock_irq(&pldat->lock);
+
+ if (pldat->num_used_tx_buffs >= (ENET_TX_DESC - 1)) {
+ /* This function should never be called when there are no
+ buffers, log the error */
+ netif_stop_queue(ndev);
+ spin_unlock_irq(&pldat->lock);
+ dev_err(&pldat->pdev->dev,
+ "BUG! TX request when no free TX buffers!\n");
+ return 1;
+ }
+
+ /* Get the next TX descriptor index */
+ txidx = readl(LPC_ENET_TXPRODUCEINDEX(pldat->net_base));
+
+ /* Setup control for the transfer */
+ ptxstat = pldat->tx_stat_v[txidx];
+ *ptxstat = 0;
+ ptxrxdesc = pldat->tx_desc_v[txidx];
+ ptxrxdesc->control =
+ (len - 1) | TXDESC_CONTROL_LAST | TXDESC_CONTROL_INT;
+
+ /* Copy data to the DMA buffer */
+ memcpy(pldat->tx_buff_v[txidx], skb->data, len);
+
+ /* Save the buffer and increment the buffer counter */
+ pldat->skb[txidx] = skb;
+ pldat->num_used_tx_buffs++;
+
+ /* Start transmit */
+ txidx++;
+ if (txidx >= ENET_TX_DESC)
+ txidx = 0;
+ writel(txidx, LPC_ENET_TXPRODUCEINDEX(pldat->net_base));
+
+ /* Stop queue if no more TX buffers */
+ if (pldat->num_used_tx_buffs >= (ENET_TX_DESC - 1))
+ netif_stop_queue(ndev);
+
+ spin_unlock_irq(&pldat->lock);
+ ndev->trans_start = jiffies;
+
+ return 0;
+}
+
+static void lpc_eth_timeout(struct net_device *ndev)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+
+ /* This should never happen and indicates a problem */
+ dev_err(&pldat->pdev->dev, "BUG! TX timeout occurred!\n");
+}
+
+static int lpc_set_mac_address(struct net_device *ndev, void *p)
+{
+ struct sockaddr *addr = p;
+ struct netdata_local *pldat = netdev_priv(ndev);
+ unsigned long flags;
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EADDRNOTAVAIL;
+ memcpy(ndev->dev_addr, addr->sa_data, ETH_ALEN);
+
+ spin_lock_irqsave(&pldat->lock, flags);
+
+ /* Set station address */
+ __lpc_set_mac(pldat, ndev->dev_addr);
+
+ spin_unlock_irqrestore(&pldat->lock, flags);
+
+ return 0;
+}
+
+static void lpc_eth_set_multicast_list(struct net_device *ndev)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+ struct netdev_hw_addr_list *mcptr = &ndev->mc;
+ struct netdev_hw_addr *ha;
+ u32 tmp32, hash_val, hashlo, hashhi;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pldat->lock, flags);
+
+ /* Set station address */
+ __lpc_set_mac(pldat, ndev->dev_addr);
+
+ tmp32 = LPC_RXFLTRW_ACCEPTUBROADCAST | LPC_RXFLTRW_ACCEPTPERFECT;
+
+ if (ndev->flags & IFF_PROMISC)
+ tmp32 |= LPC_RXFLTRW_ACCEPTUNICAST |
+ LPC_RXFLTRW_ACCEPTUMULTICAST;
+ if (ndev->flags & IFF_ALLMULTI)
+ tmp32 |= LPC_RXFLTRW_ACCEPTUMULTICAST;
+
+ if (netdev_hw_addr_list_count(mcptr))
+ tmp32 |= LPC_RXFLTRW_ACCEPTUMULTICASTHASH;
+
+ writel(tmp32, LPC_ENET_RXFILTER_CTRL(pldat->net_base));
+
+
+ /* Set initial hash table */
+ hashlo = 0x0;
+ hashhi = 0x0;
+
+ /* 64 bits : multicast address in hash table */
+ netdev_hw_addr_list_for_each(ha, mcptr) {
+ hash_val = (ether_crc(6, ha->addr) >> 23) & 0x3F;
+
+ if (hash_val >= 32)
+ hashhi |= 1 << (hash_val - 32);
+ else
+ hashlo |= 1 << hash_val;
+ }
+
+ writel(hashlo, LPC_ENET_HASHFILTERL(pldat->net_base));
+ writel(hashhi, LPC_ENET_HASHFILTERH(pldat->net_base));
+
+ spin_unlock_irqrestore(&pldat->lock, flags);
+}
+
+static int lpc_eth_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+ struct phy_device *phydev = pldat->phy_dev;
+
+ if (!netif_running(ndev))
+ return -EINVAL;
+
+ if (!phydev)
+ return -ENODEV;
+
+ return phy_mii_ioctl(phydev, req, cmd);
+}
+
+static int lpc_eth_open(struct net_device *ndev)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+
+ /* if the phy is not yet registered, retry later*/
+ if (!pldat->phy_dev)
+ return -EAGAIN;
+
+ if (netif_msg_ifup(pldat))
+ dev_dbg(&pldat->pdev->dev, "enabling %s\n", ndev->name);
+
+ if (!is_valid_ether_addr(ndev->dev_addr))
+ return -EADDRNOTAVAIL;
+
+ __lpc_eth_clock_enable(pldat, 1);
+
+ /* Reset and initialize */
+ __lpc_eth_reset(pldat);
+ __lpc_eth_init(pldat);
+
+ /* schedule a link state check */
+ phy_start(pldat->phy_dev);
+ netif_start_queue(ndev);
+ napi_enable(&pldat->napi);
+
+ return 0;
+}
+
+/*
+ * Ethtool ops
+ */
+static void lpc_eth_ethtool_getdrvinfo(struct net_device *ndev,
+ struct ethtool_drvinfo *info)
+{
+ strcpy(info->driver, MODNAME);
+ strcpy(info->version, DRV_VERSION);
+ strcpy(info->bus_info, dev_name(ndev->dev.parent));
+}
+
+static u32 lpc_eth_ethtool_getmsglevel(struct net_device *ndev)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+
+ return pldat->msg_enable;
+}
+
+static void lpc_eth_ethtool_setmsglevel(struct net_device *ndev, u32 level)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+
+ pldat->msg_enable = level;
+}
+
+static int lpc_eth_ethtool_getsettings(struct net_device *ndev,
+ struct ethtool_cmd *cmd)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+ struct phy_device *phydev = pldat->phy_dev;
+
+ if (!phydev)
+ return -ENODEV;
+
+ return phy_ethtool_gset(phydev, cmd);
+}
+
+static int lpc_eth_ethtool_setsettings(struct net_device *ndev,
+ struct ethtool_cmd *cmd)
+{
+ struct netdata_local *pldat = netdev_priv(ndev);
+ struct phy_device *phydev = pldat->phy_dev;
+
+ if (!phydev)
+ return -ENODEV;
+
+ return phy_ethtool_sset(phydev, cmd);
+}
+
+static const struct ethtool_ops lpc_eth_ethtool_ops = {
+ .get_drvinfo = lpc_eth_ethtool_getdrvinfo,
+ .get_settings = lpc_eth_ethtool_getsettings,
+ .set_settings = lpc_eth_ethtool_setsettings,
+ .get_msglevel = lpc_eth_ethtool_getmsglevel,
+ .set_msglevel = lpc_eth_ethtool_setmsglevel,
+ .get_link = ethtool_op_get_link,
+};
+
+static const struct net_device_ops lpc_netdev_ops = {
+ .ndo_open = lpc_eth_open,
+ .ndo_stop = lpc_eth_close,
+ .ndo_start_xmit = lpc_eth_hard_start_xmit,
+ .ndo_set_rx_mode = lpc_eth_set_multicast_list,
+ .ndo_do_ioctl = lpc_eth_ioctl,
+ .ndo_tx_timeout = lpc_eth_timeout,
+ .ndo_set_mac_address = lpc_set_mac_address,
+};
+
+static int lpc_eth_drv_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct resource *dma_res;
+ struct net_device *ndev;
+ struct netdata_local *pldat;
+ struct phy_device *phydev;
+ dma_addr_t dma_handle;
+ int irq, ret;
+
+ /* Get platform resources */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dma_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ irq = platform_get_irq(pdev, 0);
+ if ((!res) || (!dma_res) || (irq < 0) || (irq >= NR_IRQS)) {
+ dev_err(&pdev->dev, "error getting resources.\n");
+ ret = -ENXIO;
+ goto err_exit;
+ }
+
+ /* Allocate net driver data structure */
+ ndev = alloc_etherdev(sizeof(struct netdata_local));
+ if (!ndev) {
+ dev_err(&pdev->dev, "could not allocate device.\n");
+ ret = -ENOMEM;
+ goto err_exit;
+ }
+
+ SET_NETDEV_DEV(ndev, &pdev->dev);
+
+ pldat = netdev_priv(ndev);
+ pldat->pdev = pdev;
+ pldat->ndev = ndev;
+
+ spin_lock_init(&pldat->lock);
+
+ /* Save resources */
+ ndev->irq = irq;
+
+ /* Get clock for the device */
+ pldat->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(pldat->clk)) {
+ dev_err(&pdev->dev, "error getting clock.\n");
+ ret = PTR_ERR(pldat->clk);
+ goto err_out_free_dev;
+ }
+
+ /* Enable network clock */
+ __lpc_eth_clock_enable(pldat, 1);
+
+ /* Map IO space */
+ pldat->net_base = ioremap(res->start, res->end - res->start + 1);
+ if (!pldat->net_base) {
+ dev_err(&pdev->dev, "failed to map registers\n");
+ ret = -ENOMEM;
+ goto err_out_disable_clocks;
+ }
+ ret = request_irq(ndev->irq, __lpc_eth_interrupt, 0,
+ ndev->name, ndev);
+ if (ret) {
+ dev_err(&pdev->dev, "error requesting interrupt.\n");
+ goto err_out_iounmap;
+ }
+
+ /* Fill in the fields of the device structure with ethernet values. */
+ ether_setup(ndev);
+
+ /* Setup driver functions */
+ ndev->netdev_ops = &lpc_netdev_ops;
+ ndev->ethtool_ops = &lpc_eth_ethtool_ops;
+ ndev->watchdog_timeo = msecs_to_jiffies(watchdog);
+
+ /* Get size of DMA buffers/descriptors region */
+ pldat->dma_buff_size = (ENET_TX_DESC + ENET_RX_DESC) * (ENET_MAXF_SIZE +
+ sizeof(struct txrx_desc_t) + sizeof(struct rx_status_t));
+ pldat->dma_buff_base_v = 0;
+
+ if (use_iram_for_net()) {
+ dma_handle = dma_res->start;
+ if (pldat->dma_buff_size <= lpc32xx_return_iram_size())
+ pldat->dma_buff_base_v =
+ io_p2v(dma_res->start);
+ else
+ netdev_err(ndev,
+ "IRAM not big enough for net buffers, using SDRAM instead.\n");
+ }
+
+ if (pldat->dma_buff_base_v == 0) {
+ pldat->dma_buff_size = PAGE_ALIGN(pldat->dma_buff_size);
+
+ /* Allocate a chunk of memory for the DMA ethernet buffers
+ and descriptors */
+ pldat->dma_buff_base_v =
+ dma_alloc_coherent(&pldat->pdev->dev,
+ pldat->dma_buff_size,
+ &dma_handle, GFP_KERNEL);
+
+ if (pldat->dma_buff_base_v == NULL) {
+ dev_err(&pdev->dev, "error getting DMA region.\n");
+ ret = -ENOMEM;
+ goto err_out_free_irq;
+ }
+ }
+ pldat->dma_buff_base_p = dma_handle;
+
+ netdev_dbg(ndev, "IO address start :0x%08x\n",
+ res->start);
+ netdev_dbg(ndev, "IO address size :%d\n",
+ res->end - res->start + 1);
+ netdev_err(ndev, "IO address (mapped) :0x%p\n",
+ pldat->net_base);
+ netdev_dbg(ndev, "IRQ number :%d\n", ndev->irq);
+ netdev_dbg(ndev, "DMA buffer size :%d\n", pldat->dma_buff_size);
+ netdev_dbg(ndev, "DMA buffer P address :0x%08x\n",
+ pldat->dma_buff_base_p);
+ netdev_dbg(ndev, "DMA buffer V address :0x%p\n",
+ pldat->dma_buff_base_v);
+
+ /* Get MAC address from current HW setting (POR state is all zeros) */
+ __lpc_get_mac(pldat, ndev->dev_addr);
+
+#ifdef CONFIG_OF_NET
+ if (!is_valid_ether_addr(ndev->dev_addr)) {
+ const char *macaddr = of_get_mac_address(pdev->dev.of_node);
+ if (macaddr)
+ memcpy(ndev->dev_addr, macaddr, ETH_ALEN);
+ }
+#endif
+ if (!is_valid_ether_addr(ndev->dev_addr))
+ dev_hw_addr_random(ndev, ndev->dev_addr);
+
+ /* Reset the ethernet controller */
+ __lpc_eth_reset(pldat);
+
+ /* then shut everything down to save power */
+ __lpc_eth_shutdown(pldat);
+
+ /* Set default parameters */
+ pldat->msg_enable = NETIF_MSG_LINK;
+
+ /* Force an MII interface reset and clock setup */
+ __lpc_mii_mngt_reset(pldat);
+
+ /* Force default PHY interface setup in chip, this will probably be
+ changed by the PHY driver */
+ pldat->link = 0;
+ pldat->speed = 100;
+ pldat->duplex = DUPLEX_FULL;
+ __lpc_params_setup(pldat);
+
+ netif_napi_add(ndev, &pldat->napi, lpc_eth_poll, NAPI_WEIGHT);
+
+ ret = register_netdev(ndev);
+ if (ret) {
+ dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
+ goto err_out_dma_unmap;
+ }
+ platform_set_drvdata(pdev, ndev);
+
+ if (lpc_mii_init(pldat) != 0)
+ goto err_out_unregister_netdev;
+
+ netdev_info(ndev, "LPC mac at 0x%08x irq %d\n",
+ res->start, ndev->irq);
+
+ phydev = pldat->phy_dev;
+ netdev_info(ndev,
+ "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
+ phydev->drv->name, dev_name(&phydev->dev), phydev->irq);
+
+ device_init_wakeup(&pdev->dev, 1);
+ device_set_wakeup_enable(&pdev->dev, 0);
+
+ return 0;
+
+err_out_unregister_netdev:
+ platform_set_drvdata(pdev, NULL);
+ unregister_netdev(ndev);
+err_out_dma_unmap:
+ if (!use_iram_for_net() ||
+ pldat->dma_buff_size > lpc32xx_return_iram_size())
+ dma_free_coherent(&pldat->pdev->dev, pldat->dma_buff_size,
+ pldat->dma_buff_base_v,
+ pldat->dma_buff_base_p);
+err_out_free_irq:
+ free_irq(ndev->irq, ndev);
+err_out_iounmap:
+ iounmap(pldat->net_base);
+err_out_disable_clocks:
+ clk_disable(pldat->clk);
+ clk_put(pldat->clk);
+err_out_free_dev:
+ free_netdev(ndev);
+err_exit:
+ pr_err("%s: not found (%d).\n", MODNAME, ret);
+ return ret;
+}
+
+static int lpc_eth_drv_remove(struct platform_device *pdev)
+{
+ struct net_device *ndev = platform_get_drvdata(pdev);
+ struct netdata_local *pldat = netdev_priv(ndev);
+
+ unregister_netdev(ndev);
+ platform_set_drvdata(pdev, NULL);
+
+ if (!use_iram_for_net() ||
+ pldat->dma_buff_size > lpc32xx_return_iram_size())
+ dma_free_coherent(&pldat->pdev->dev, pldat->dma_buff_size,
+ pldat->dma_buff_base_v,
+ pldat->dma_buff_base_p);
+ free_irq(ndev->irq, ndev);
+ iounmap(pldat->net_base);
+ clk_disable(pldat->clk);
+ clk_put(pldat->clk);
+ free_netdev(ndev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int lpc_eth_drv_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct net_device *ndev = platform_get_drvdata(pdev);
+ struct netdata_local *pldat = netdev_priv(ndev);
+
+ if (device_may_wakeup(&pdev->dev))
+ enable_irq_wake(ndev->irq);
+
+ if (ndev) {
+ if (netif_running(ndev)) {
+ netif_device_detach(ndev);
+ __lpc_eth_shutdown(pldat);
+ clk_disable(pldat->clk);
+
+ /*
+ * Reset again now clock is disable to be sure
+ * EMC_MDC is down
+ */
+ __lpc_eth_reset(pldat);
+ }
+ }
+
+ return 0;
+}
+
+static int lpc_eth_drv_resume(struct platform_device *pdev)
+{
+ struct net_device *ndev = platform_get_drvdata(pdev);
+ struct netdata_local *pldat;
+
+ if (device_may_wakeup(&pdev->dev))
+ disable_irq_wake(ndev->irq);
+
+ if (ndev) {
+ if (netif_running(ndev)) {
+ pldat = netdev_priv(ndev);
+
+ /* Enable interface clock */
+ clk_enable(pldat->clk);
+
+ /* Reset and initialize */
+ __lpc_eth_reset(pldat);
+ __lpc_eth_init(pldat);
+
+ netif_device_attach(ndev);
+ }
+ }
+
+ return 0;
+}
+#endif
+
+static struct platform_driver lpc_eth_driver = {
+ .probe = lpc_eth_drv_probe,
+ .remove = __devexit_p(lpc_eth_drv_remove),
+#ifdef CONFIG_PM
+ .suspend = lpc_eth_drv_suspend,
+ .resume = lpc_eth_drv_resume,
+#endif
+ .driver = {
+ .name = MODNAME,
+ },
+};
+
+module_platform_driver(lpc_eth_driver);
+
+MODULE_AUTHOR("Kevin Wells <kevin.wells@....com>");
+MODULE_AUTHOR("Roland Stigge <stigge@...com.de>");
+MODULE_DESCRIPTION("LPC Ethernet Driver");
+MODULE_LICENSE("GPL");
+
--
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