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Date: Sat, 14 Aug 2010 12:52:49 +0530
From: Sachin Sanap <ssanap@...vell.com>
To: Lennert Buytenhek <buytenh@...tstofly.org>
CC: Philip Rakity <prakity@...vell.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Ashish Karkare <akarkare@...vell.com>,
"Prabhanjan Sarnaik" <sarnaik@...vell.com>,
"eric.y.miao@...il.com" <eric.y.miao@...il.com>,
Mark Brown <markb@...vell.com>
Subject: Re: [PATCH v3] net: add Fast Ethernet driver for PXA168.
>From df92c2959eb0e50ea63c90822fb9e1edef673ea6 Mon Sep 17 00:00:00 2001
From: Sachin Sanap <ssanap@...vell.com>
Date: Sat, 14 Aug 2010 17:11:05 +0530
Subject: [PATCH] net: add Fast Ethernet driver for PXA168.
Signed-off-by: Sachin Sanap <ssanap@...vell.com>
---
V3:
* TX_DONE interrupt is now generated for every packet.
* MTU can now be configured upto 9500 bytes.
* TX/RX ring sizes are now platform configurable.
* Remove the CPU hogging and yield the CPU while SMI operations take time.
* Cleanup the hash table for old MAC address entries in set_rx_mode function.
drivers/net/Kconfig | 10 +
drivers/net/Makefile | 1 +
drivers/net/pxa168_eth.c | 1666 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/pxa168_eth.h | 30 +
4 files changed, 1707 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/pxa168_eth.c
create mode 100644 include/linux/pxa168_eth.h
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index ce2fcdd..78cd7e8 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -927,6 +927,16 @@ config SMC91X
The module will be called smc91x. If you want to compile it as a
module, say M here and read <file:Documentation/kbuild/modules.txt>.
+config PXA168_ETH
+ tristate "Marvell pxa168 ethernet support"
+ depends on CPU_PXA168
+ select PHYLIB
+ help
+ This driver supports the pxa168 Ethernet ports.
+
+ To compile this driver as a module, choose M here. The module
+ will be called pxa168_eth.
+
config NET_NETX
tristate "NetX Ethernet support"
select MII
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 0a0512a..a42d437 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -244,6 +244,7 @@ obj-$(CONFIG_MYRI10GE) += myri10ge/
obj-$(CONFIG_SMC91X) += smc91x.o
obj-$(CONFIG_SMC911X) += smc911x.o
obj-$(CONFIG_SMSC911X) += smsc911x.o
+obj-$(CONFIG_PXA168_ETH) += pxa168_eth.o
obj-$(CONFIG_BFIN_MAC) += bfin_mac.o
obj-$(CONFIG_DM9000) += dm9000.o
obj-$(CONFIG_PASEMI_MAC) += pasemi_mac_driver.o
diff --git a/drivers/net/pxa168_eth.c b/drivers/net/pxa168_eth.c
new file mode 100644
index 0000000..ecc64d7
--- /dev/null
+++ b/drivers/net/pxa168_eth.c
@@ -0,0 +1,1666 @@
+/*
+ * PXA168 ethernet driver.
+ * Most of the code is derived from mv643xx ethernet driver.
+ *
+ * Copyright (C) 2010 Marvell International Ltd.
+ * Sachin Sanap <ssanap@...vell.com>
+ * Philip Rakity <prakity@...vell.com>
+ * Mark Brown <markb@...vell.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/etherdevice.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+#include <linux/clk.h>
+#include <linux/phy.h>
+#include <linux/io.h>
+#include <linux/types.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <asm/cacheflush.h>
+#include <linux/pxa168_eth.h>
+
+#define DRIVER_NAME "pxa168-eth"
+#define DRIVER_VERSION "0.3"
+
+/*
+ * Registers
+ */
+
+#define PHY_ADDRESS 0x0000
+#define SMI 0x0010
+#define PORT_CONFIG 0x0400
+#define PORT_CONFIG_EXT 0x0408
+#define PORT_COMMAND 0x0410
+#define PORT_STATUS 0x0418
+#define HTPR 0x0428
+#define SDMA_CONFIG 0x0440
+#define SDMA_CMD 0x0448
+#define INT_CAUSE 0x0450
+#define INT_W_CLEAR 0x0454
+#define INT_MASK 0x0458
+#define ETH_F_RX_DESC_0 0x0480
+#define ETH_C_RX_DESC_0 0x04A0
+#define ETH_C_TX_DESC_1 0x04E4
+
+/* smi register */
+#define SMI_BUSY (1 << 28) /* 0 - Write, 1 - Read */
+#define SMI_R_VALID (1 << 27) /* 0 - Write, 1 - Read */
+#define SMI_OP_W (0 << 26) /* Write operation */
+#define SMI_OP_R (1 << 26) /* Read operation */
+
+#define PHY_WAIT_ITERATIONS 10
+
+#define PXA168_ETH_PHY_ADDR_DEFAULT 0
+/* RX & TX descriptor command */
+#define BUF_OWNED_BY_DMA (1 << 31)
+
+/* RX descriptor status */
+#define RX_EN_INT (1 << 23)
+#define RX_FIRST_DESC (1 << 17)
+#define RX_LAST_DESC (1 << 16)
+#define RX_ERROR (1 << 15)
+
+/* TX descriptor command */
+#define TX_EN_INT (1 << 23)
+#define TX_GEN_CRC (1 << 22)
+#define TX_ZERO_PADDING (1 << 18)
+#define TX_FIRST_DESC (1 << 17)
+#define TX_LAST_DESC (1 << 16)
+#define TX_ERROR (1 << 15)
+
+/* SDMA_CMD */
+#define SDMA_CMD_AT (1 << 31)
+#define SDMA_CMD_TXDL (1 << 24)
+#define SDMA_CMD_TXDH (1 << 23)
+#define SDMA_CMD_AR (1 << 15)
+#define SDMA_CMD_ERD (1 << 7)
+
+/* Bit definitions of the Port Config Reg */
+#define PCR_HS (1 << 12)
+#define PCR_EN (1 << 7)
+#define PCR_PM (1 << 0)
+
+/* Bit definitions of the Port Config Extend Reg */
+#define PCXR_2BSM (1 << 28)
+#define PCXR_DSCP_EN (1 << 21)
+#define PCXR_MFL_1518 (0 << 14)
+#define PCXR_MFL_1536 (1 << 14)
+#define PCXR_MFL_2048 (2 << 14)
+#define PCXR_MFL_64K (3 << 14)
+#define PCXR_FLP (1 << 11)
+#define PCXR_PRIO_TX_OFF 3
+#define PCXR_TX_HIGH_PRI (7 << PCXR_PRIO_TX_OFF)
+
+/* Bit definitions of the SDMA Config Reg */
+#define SDCR_BSZ_OFF 12
+#define SDCR_BSZ8 (3 << SDCR_BSZ_OFF)
+#define SDCR_BSZ4 (2 << SDCR_BSZ_OFF)
+#define SDCR_BSZ2 (1 << SDCR_BSZ_OFF)
+#define SDCR_BSZ1 (0 << SDCR_BSZ_OFF)
+#define SDCR_BLMR (1 << 6)
+#define SDCR_BLMT (1 << 7)
+#define SDCR_RIFB (1 << 9)
+#define SDCR_RC_OFF 2
+#define SDCR_RC_MAX_RETRANS (0xf << SDCR_RC_OFF)
+
+/*
+ * Bit definitions of the Interrupt Cause Reg
+ * and Interrupt MASK Reg is the same
+ */
+#define ICR_RXBUF (1 << 0)
+#define ICR_TXBUF_H (1 << 2)
+#define ICR_TXBUF_L (1 << 3)
+#define ICR_TXEND_H (1 << 6)
+#define ICR_TXEND_L (1 << 7)
+#define ICR_RXERR (1 << 8)
+#define ICR_TXERR_H (1 << 10)
+#define ICR_TXERR_L (1 << 11)
+#define ICR_TX_UDR (1 << 13)
+#define ICR_MII_CH (1 << 28)
+
+#define ALL_INTS (ICR_TXBUF_H | ICR_TXBUF_L | ICR_TX_UDR |\
+ ICR_TXERR_H | ICR_TXERR_L |\
+ ICR_TXEND_H | ICR_TXEND_L |\
+ ICR_RXBUF | ICR_RXERR | ICR_MII_CH)
+
+#define ETH_HW_IP_ALIGN 2 /* hw aligns IP header */
+
+#define NUM_RX_DESCS 64
+#define NUM_TX_DESCS 64
+
+#define HASH_ADD 0
+#define HASH_DELETE 1
+#define HASH_ADDR_TABLE_SIZE 0x4000 /* 16K (1/2K address - PCR_HS == 1) */
+#define HOP_NUMBER 12
+
+/* Bit definitions for Port status */
+#define PORT_SPEED_100 (1 << 0)
+#define FULL_DUPLEX (1 << 1)
+#define FLOW_CONTROL_ENABLED (1 << 2)
+#define LINK_UP (1 << 3)
+
+/* Bit definitions for work to be done */
+#define WORK_LINK (1 << 0)
+#define WORK_TX_DONE (1 << 1)
+
+/*
+ * Misc definitions.
+ */
+#define SKB_DMA_REALIGN ((PAGE_SIZE - NET_SKB_PAD) % SMP_CACHE_BYTES)
+
+struct rx_desc {
+ u32 cmd_sts; /* Descriptor command status */
+ u16 byte_cnt; /* Descriptor buffer byte count */
+ u16 buf_size; /* Buffer size */
+ u32 buf_ptr; /* Descriptor buffer pointer */
+ u32 next_desc_ptr; /* Next descriptor pointer */
+};
+
+struct tx_desc {
+ u32 cmd_sts; /* Command/status field */
+ u16 reserved;
+ u16 byte_cnt; /* buffer byte count */
+ u32 buf_ptr; /* pointer to buffer for this descriptor */
+ u32 next_desc_ptr; /* Pointer to next descriptor */
+};
+
+struct pxa168_eth_private {
+ int port_num; /* User Ethernet port number */
+
+ int rx_resource_err; /* Rx ring resource error flag */
+
+ /* Next available and first returning Rx resource */
+ int rx_curr_desc_q, rx_used_desc_q;
+
+ /* Next available and first returning Tx resource */
+ int tx_curr_desc_q, tx_used_desc_q;
+
+ struct rx_desc *p_rx_desc_area;
+ dma_addr_t rx_desc_dma;
+ int rx_desc_area_size;
+ struct sk_buff **rx_skb;
+
+ struct tx_desc *p_tx_desc_area;
+ dma_addr_t tx_desc_dma;
+ int tx_desc_area_size;
+ struct sk_buff **tx_skb;
+
+ struct work_struct tx_timeout_task;
+
+ struct net_device *dev;
+ struct napi_struct napi;
+ u8 work_todo;
+ int skb_size;
+
+ struct net_device_stats stats;
+ /* Size of Tx Ring per queue */
+ int tx_ring_size;
+ /* Number of tx descriptors in use */
+ int tx_desc_count;
+ /* Size of Rx Ring per queue */
+ int rx_ring_size;
+ /* Number of rx descriptors in use */
+ int rx_desc_count;
+
+ /*
+ * Used in case RX Ring is empty, which can occur when
+ * system does not have resources (skb's)
+ */
+ struct timer_list timeout;
+ struct mii_bus *smi_bus;
+ struct phy_device *phy;
+
+ /* clock */
+ struct clk *clk;
+ struct pxa168_eth_platform_data *pd;
+ /*
+ * Ethernet controller base address.
+ */
+ void __iomem *base;
+
+ /* Pointer to the hardware address filter table */
+ void *htpr;
+ dma_addr_t htpr_dma;
+};
+
+struct addr_table_entry {
+ __le32 lo;
+ __le32 hi;
+};
+
+/* Bit fields of a Hash Table Entry */
+enum hash_table_entry {
+ HASH_ENTRY_VALID = 1,
+ SKIP = 2,
+ HASH_ENTRY_RECEIVE_DISCARD = 4,
+ HASH_ENTRY_RECEIVE_DISCARD_BIT = 2
+};
+
+static int pxa168_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
+static int pxa168_set_settings(struct net_device *dev, struct ethtool_cmd *cmd);
+static int pxa168_init_hw(struct pxa168_eth_private *pep);
+static void eth_port_reset(struct net_device *dev);
+static void eth_port_start(struct net_device *dev);
+static int pxa168_eth_open(struct net_device *dev);
+static int pxa168_eth_stop(struct net_device *dev);
+static int ethernet_phy_setup(struct net_device *dev);
+
+static inline u32 rdl(struct pxa168_eth_private *pep, int offset)
+{
+ return readl(pep->base + offset);
+}
+
+static inline void wrl(struct pxa168_eth_private *pep, int offset, u32 data)
+{
+ writel(data, pep->base + offset);
+}
+
+static void abort_dma(struct pxa168_eth_private *pep)
+{
+ int delay;
+ int max_retries = 40;
+
+ do {
+ wrl(pep, SDMA_CMD, SDMA_CMD_AR | SDMA_CMD_AT);
+ udelay(100);
+
+ delay = 10;
+ while ((rdl(pep, SDMA_CMD) & (SDMA_CMD_AR | SDMA_CMD_AT))
+ && delay-- > 0) {
+ udelay(10);
+ }
+ } while (max_retries-- > 0 && delay <= 0);
+
+ if (max_retries <= 0)
+ printk(KERN_ERR "%s : DMA Stuck\n", __func__);
+}
+
+static int ethernet_phy_get(struct pxa168_eth_private *pep)
+{
+ unsigned int reg_data;
+
+ reg_data = rdl(pep, PHY_ADDRESS);
+
+ return (reg_data >> (5 * pep->port_num)) & 0x1f;
+}
+
+static void ethernet_phy_set_addr(struct pxa168_eth_private *pep, int phy_addr)
+{
+ u32 reg_data;
+ int addr_shift = 5 * pep->port_num;
+
+ reg_data = rdl(pep, PHY_ADDRESS);
+ reg_data &= ~(0x1f << addr_shift);
+ reg_data |= (phy_addr & 0x1f) << addr_shift;
+ wrl(pep, PHY_ADDRESS, reg_data);
+}
+
+static void ethernet_phy_reset(struct pxa168_eth_private *pep)
+{
+ int data;
+
+ data = phy_read(pep->phy, MII_BMCR);
+ if (data < 0)
+ return;
+
+ data |= BMCR_RESET;
+ if (phy_write(pep->phy, MII_BMCR, data) < 0)
+ return;
+
+ do {
+ data = phy_read(pep->phy, MII_BMCR);
+ } while (data >= 0 && data & BMCR_RESET);
+}
+
+static void rxq_refill(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ struct sk_buff *skb;
+ struct rx_desc *p_used_rx_desc;
+ int used_rx_desc;
+
+ while (pep->rx_desc_count < pep->rx_ring_size) {
+ int size;
+
+ skb = dev_alloc_skb(pep->skb_size);
+ if (!skb)
+ break;
+ if (SKB_DMA_REALIGN)
+ skb_reserve(skb, SKB_DMA_REALIGN);
+ pep->rx_desc_count++;
+ /* Get 'used' Rx descriptor */
+ used_rx_desc = pep->rx_used_desc_q;
+ p_used_rx_desc = &pep->p_rx_desc_area[used_rx_desc];
+ size = skb->end - skb->data;
+ p_used_rx_desc->buf_ptr = dma_map_single(NULL,
+ skb->data,
+ size,
+ DMA_FROM_DEVICE);
+ p_used_rx_desc->buf_size = size;
+ pep->rx_skb[used_rx_desc] = skb;
+
+ /* Return the descriptor to DMA ownership */
+ wmb();
+ p_used_rx_desc->cmd_sts = BUF_OWNED_BY_DMA | RX_EN_INT;
+ wmb();
+
+ /* Move the used descriptor pointer to the next descriptor */
+ pep->rx_used_desc_q = (used_rx_desc + 1) % pep->rx_ring_size;
+
+ /* Any Rx return cancels the Rx resource error status */
+ pep->rx_resource_err = 0;
+
+ skb_reserve(skb, ETH_HW_IP_ALIGN);
+ }
+
+ /*
+ * If RX ring is empty of SKB, set a timer to try allocating
+ * again at a later time.
+ */
+ if (pep->rx_desc_count == 0) {
+ pep->timeout.expires = jiffies + (HZ / 10);
+ add_timer(&pep->timeout);
+ }
+}
+
+static inline void rxq_refill_timer_wrapper(unsigned long data)
+{
+ struct pxa168_eth_private *pep = (void *)data;
+ napi_schedule(&pep->napi);
+}
+
+static inline u8 flip_8_bits(u8 x)
+{
+ return (((x) & 0x01) << 3) | (((x) & 0x02) << 1)
+ | (((x) & 0x04) >> 1) | (((x) & 0x08) >> 3)
+ | (((x) & 0x10) << 3) | (((x) & 0x20) << 1)
+ | (((x) & 0x40) >> 1) | (((x) & 0x80) >> 3);
+}
+
+static void nibble_swap_every_byte(unsigned char *mac_addr)
+{
+ int i;
+ for (i = 0; i < ETH_ALEN; i++) {
+ mac_addr[i] = ((mac_addr[i] & 0x0f) << 4) |
+ ((mac_addr[i] & 0xf0) >> 4);
+ }
+}
+
+static void inverse_every_nibble(unsigned char *mac_addr)
+{
+ int i;
+ for (i = 0; i < ETH_ALEN; i++)
+ mac_addr[i] = flip_8_bits(mac_addr[i]);
+}
+
+/*
+ * ----------------------------------------------------------------------------
+ * This function will calculate the hash function of the address.
+ * Inputs
+ * mac_addr_orig - MAC address.
+ * Outputs
+ * return the calculated entry.
+ */
+static u32 hash_function(unsigned char *mac_addr_orig)
+{
+ u32 hash_result;
+ u32 addr0;
+ u32 addr1;
+ u32 addr2;
+ u32 addr3;
+ unsigned char mac_addr[ETH_ALEN];
+
+ /* Make a copy of MAC address since we are going to performe bit
+ * operations on it
+ */
+ memcpy(mac_addr, mac_addr_orig, ETH_ALEN);
+
+ nibble_swap_every_byte(mac_addr);
+ inverse_every_nibble(mac_addr);
+
+ addr0 = (mac_addr[5] >> 2) & 0x3f;
+ addr1 = (mac_addr[5] & 0x03) | (((mac_addr[4] & 0x7f)) << 2);
+ addr2 = ((mac_addr[4] & 0x80) >> 7) | mac_addr[3] << 1;
+ addr3 = (mac_addr[2] & 0xff) | ((mac_addr[1] & 1) << 8);
+
+ hash_result = (addr0 << 9) | (addr1 ^ addr2 ^ addr3);
+ hash_result = hash_result & 0x07ff;
+ return hash_result;
+}
+
+/*
+ * ----------------------------------------------------------------------------
+ * This function will add/del an entry to the address table.
+ * Inputs
+ * pep - ETHERNET .
+ * mac_addr - MAC address.
+ * skip - if 1, skip this address.Used in case of deleting an entry which is a
+ * part of chain in the hash table.We cant just delete the entry since
+ * that will break the chain.We need to defragment the tables time to
+ * time.
+ * rd - 0 Discard packet upon match.
+ * - 1 Receive packet upon match.
+ * Outputs
+ * address table entry is added/deleted.
+ * 0 if success.
+ * -ENOSPC if table full
+ */
+static int add_del_hash_entry(struct pxa168_eth_private *pep,
+ unsigned char *mac_addr,
+ u32 rd, u32 skip, int del)
+{
+ struct addr_table_entry *entry, *start;
+ u32 new_high;
+ u32 new_low;
+ u32 i;
+
+ new_low = (((mac_addr[1] >> 4) & 0xf) << 15)
+ | (((mac_addr[1] >> 0) & 0xf) << 11)
+ | (((mac_addr[0] >> 4) & 0xf) << 7)
+ | (((mac_addr[0] >> 0) & 0xf) << 3)
+ | (((mac_addr[3] >> 4) & 0x1) << 31)
+ | (((mac_addr[3] >> 0) & 0xf) << 27)
+ | (((mac_addr[2] >> 4) & 0xf) << 23)
+ | (((mac_addr[2] >> 0) & 0xf) << 19)
+ | (skip << SKIP) | (rd << HASH_ENTRY_RECEIVE_DISCARD_BIT)
+ | HASH_ENTRY_VALID;
+
+ new_high = (((mac_addr[5] >> 4) & 0xf) << 15)
+ | (((mac_addr[5] >> 0) & 0xf) << 11)
+ | (((mac_addr[4] >> 4) & 0xf) << 7)
+ | (((mac_addr[4] >> 0) & 0xf) << 3)
+ | (((mac_addr[3] >> 5) & 0x7) << 0);
+
+ /*
+ * Pick the appropriate table, start scanning for free/reusable
+ * entries at the index obtained by hashing the specified MAC address
+ */
+ start = (struct addr_table_entry *)(pep->htpr);
+ entry = start + hash_function(mac_addr);
+ for (i = 0; i < HOP_NUMBER; i++) {
+ if (!(le32_to_cpu(entry->lo) & HASH_ENTRY_VALID)) {
+ break;
+ } else {
+ /* if same address put in same position */
+ if (((le32_to_cpu(entry->lo) & 0xfffffff8) ==
+ (new_low & 0xfffffff8)) &&
+ (le32_to_cpu(entry->hi) == new_high)) {
+ break;
+ }
+ }
+ if (entry == start + 0x7ff)
+ entry = start;
+ else
+ entry++;
+ }
+
+ if (((le32_to_cpu(entry->lo) & 0xfffffff8) != (new_low & 0xfffffff8)) &&
+ (le32_to_cpu(entry->hi) != new_high) && del)
+ return 0;
+
+ if (i == HOP_NUMBER) {
+ if (!del) {
+ printk(KERN_INFO "%s: table section is full, need to "
+ "move to 16kB implementation?\n",
+ __FILE__);
+ return -ENOSPC;
+ } else
+ return 0;
+ }
+
+ /*
+ * Update the selected entry
+ */
+ if (del) {
+ entry->hi = 0;
+ entry->lo = 0;
+ } else {
+ entry->hi = cpu_to_le32(new_high);
+ entry->lo = cpu_to_le32(new_low);
+ }
+
+ return 0;
+}
+
+/*
+ * ----------------------------------------------------------------------------
+ * Create an addressTable entry from MAC address info
+ * found in the specifed net_device struct
+ *
+ * Input : pointer to ethernet interface network device structure
+ * Output : N/A
+ */
+static void update_hash_table_mac_address(struct pxa168_eth_private *pep,
+ unsigned char *oaddr,
+ unsigned char *addr)
+{
+ /* Delete old entry */
+ if (oaddr)
+ add_del_hash_entry(pep, oaddr, 1, 0, HASH_DELETE);
+ /* Add new entry */
+ add_del_hash_entry(pep, addr, 1, 0, HASH_ADD);
+}
+
+static int init_hash_table(struct pxa168_eth_private *pep)
+{
+ /*
+ * Hardware expects CPU to build a hash table based on a predefined
+ * hash function and populate it based on hardware address. The
+ * location of the hash table is identified by 32-bit pointer stored
+ * in HTPR internal register. Two possible sizes exists for the hash
+ * table 8kB (256kB of DRAM required (4 x 64 kB banks)) and 1/2kB
+ * (16kB of DRAM required (4 x 4 kB banks)).We currently only support
+ * 1/2kB.
+ */
+ /* TODO: Add support for 8kB hash table and alternative hash
+ * function.Driver can dynamically switch to them if the 1/2kB hash
+ * table is full.
+ */
+ if (pep->htpr == NULL) {
+ pep->htpr = dma_alloc_coherent(pep->dev->dev.parent,
+ HASH_ADDR_TABLE_SIZE,
+ &pep->htpr_dma, GFP_KERNEL);
+ if (pep->htpr == NULL)
+ return -ENOMEM;
+ }
+ memset(pep->htpr, 0, HASH_ADDR_TABLE_SIZE);
+ wrl(pep, HTPR, pep->htpr_dma);
+ return 0;
+}
+
+static void pxa168_eth_set_rx_mode(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ struct netdev_hw_addr *ha;
+ u32 val;
+
+ val = rdl(pep, PORT_CONFIG);
+ if (dev->flags & IFF_PROMISC)
+ val |= PCR_PM;
+ else
+ val &= ~PCR_PM;
+ wrl(pep, PORT_CONFIG, val);
+
+ /*
+ * Remove the old list of MAC address and add dev->addr
+ * and multicast address.
+ */
+ memset(pep->htpr, 0, HASH_ADDR_TABLE_SIZE);
+ update_hash_table_mac_address(pep, NULL, dev->dev_addr);
+
+ netdev_for_each_mc_addr(ha, dev)
+ update_hash_table_mac_address(pep, NULL, ha->addr);
+}
+
+static int pxa168_eth_set_mac_address(struct net_device *dev, void *addr)
+{
+ struct sockaddr *sa = addr;
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ unsigned char oldMac[ETH_ALEN];
+
+ if (!is_valid_ether_addr(sa->sa_data))
+ return -EINVAL;
+ memcpy(oldMac, dev->dev_addr, ETH_ALEN);
+ memcpy(dev->dev_addr, sa->sa_data, ETH_ALEN);
+ netif_addr_lock_bh(dev);
+ update_hash_table_mac_address(pep, oldMac, dev->dev_addr);
+ netif_addr_unlock_bh(dev);
+ return 0;
+}
+
+static void eth_port_start(struct net_device *dev)
+{
+ unsigned int val = 0;
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ int tx_curr_desc, rx_curr_desc;
+
+ /* Perform PHY reset, if there is a PHY. */
+ if (pep->phy != NULL) {
+ struct ethtool_cmd cmd;
+
+ pxa168_get_settings(pep->dev, &cmd);
+ ethernet_phy_reset(pep);
+ pxa168_set_settings(pep->dev, &cmd);
+ }
+
+ /* Assignment of Tx CTRP of given queue */
+ tx_curr_desc = pep->tx_curr_desc_q;
+ wrl(pep, ETH_C_TX_DESC_1,
+ (u32) ((struct tx_desc *)pep->tx_desc_dma + tx_curr_desc));
+
+ /* Assignment of Rx CRDP of given queue */
+ rx_curr_desc = pep->rx_curr_desc_q;
+ wrl(pep, ETH_C_RX_DESC_0,
+ (u32) ((struct rx_desc *)pep->rx_desc_dma + rx_curr_desc));
+
+ wrl(pep, ETH_F_RX_DESC_0,
+ (u32) ((struct rx_desc *)pep->rx_desc_dma + rx_curr_desc));
+
+ /* Clear all interrupts */
+ wrl(pep, INT_CAUSE, 0);
+
+ /* Enable all interrupts for receive, transmit and error. */
+ wrl(pep, INT_MASK, ALL_INTS);
+
+ val = rdl(pep, PORT_CONFIG);
+ val |= PCR_EN;
+ wrl(pep, PORT_CONFIG, val);
+
+ /* Start RX DMA engine */
+ val = rdl(pep, SDMA_CMD);
+ val |= SDMA_CMD_ERD;
+ wrl(pep, SDMA_CMD, val);
+}
+
+static void eth_port_reset(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ unsigned int val = 0;
+
+ /* Stop all interrupts for receive, transmit and error. */
+ wrl(pep, INT_MASK, 0);
+
+ /* Clear all interrupts */
+ wrl(pep, INT_CAUSE, 0);
+
+ /* Stop RX DMA */
+ val = rdl(pep, SDMA_CMD);
+ val &= ~SDMA_CMD_ERD; /* abort dma command */
+
+ /* Abort any transmit and receive operations and put DMA
+ * in idle state.
+ */
+ abort_dma(pep);
+
+ /* Disable port */
+ val = rdl(pep, PORT_CONFIG);
+ val &= ~PCR_EN;
+ wrl(pep, PORT_CONFIG, val);
+}
+
+/*
+ * txq_reclaim - Free the tx desc data for completed descriptors
+ * If force is non-zero, frees uncompleted descriptors as well
+ */
+static int txq_reclaim(struct net_device *dev, int force)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ struct tx_desc *desc;
+ u32 cmd_sts;
+ struct sk_buff *skb;
+ int tx_index;
+ dma_addr_t addr;
+ int count;
+ int released = 0;
+
+ netif_tx_lock(dev);
+
+ pep->work_todo &= ~WORK_TX_DONE;
+ while (pep->tx_desc_count > 0) {
+ tx_index = pep->tx_used_desc_q;
+ desc = &pep->p_tx_desc_area[tx_index];
+ cmd_sts = desc->cmd_sts;
+ if (!force && (cmd_sts & BUF_OWNED_BY_DMA)) {
+ if (released > 0) {
+ goto txq_reclaim_end;
+ } else {
+ released = -1;
+ goto txq_reclaim_end;
+ }
+ }
+ pep->tx_used_desc_q = (tx_index + 1) % pep->tx_ring_size;
+ pep->tx_desc_count--;
+ addr = desc->buf_ptr;
+ count = desc->byte_cnt;
+ skb = pep->tx_skb[tx_index];
+ if (skb)
+ pep->tx_skb[tx_index] = NULL;
+
+ if (cmd_sts & TX_ERROR) {
+ if (net_ratelimit())
+ printk(KERN_ERR "%s: Error in TX\n", dev->name);
+ dev->stats.tx_errors++;
+ }
+ dma_unmap_single(NULL, addr, count, DMA_TO_DEVICE);
+ if (skb)
+ dev_kfree_skb_irq(skb);
+ released++;
+ }
+txq_reclaim_end:
+ netif_tx_unlock(dev);
+ return released;
+}
+
+static void pxa168_eth_tx_timeout(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+
+ printk(KERN_INFO "%s: TX timeout desc_count %d\n",
+ dev->name, pep->tx_desc_count);
+
+ schedule_work(&pep->tx_timeout_task);
+}
+
+static void pxa168_eth_tx_timeout_task(struct work_struct *work)
+{
+ struct pxa168_eth_private *pep = container_of(work,
+ struct pxa168_eth_private,
+ tx_timeout_task);
+ struct net_device *dev = pep->dev;
+ pxa168_eth_stop(dev);
+ pxa168_eth_open(dev);
+}
+
+static int rxq_process(struct net_device *dev, int budget)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ struct net_device_stats *stats = &dev->stats;
+ unsigned int received_packets = 0;
+ struct sk_buff *skb;
+
+ while (budget-- > 0) {
+ int rx_next_curr_desc, rx_curr_desc, rx_used_desc;
+ struct rx_desc *rx_desc;
+ unsigned int cmd_sts;
+
+ /* Do not process Rx ring in case of Rx ring resource error */
+ if (pep->rx_resource_err)
+ break;
+ rx_curr_desc = pep->rx_curr_desc_q;
+ rx_used_desc = pep->rx_used_desc_q;
+ rx_desc = &pep->p_rx_desc_area[rx_curr_desc];
+ cmd_sts = rx_desc->cmd_sts;
+ rmb();
+ if (cmd_sts & (BUF_OWNED_BY_DMA))
+ break;
+ skb = pep->rx_skb[rx_curr_desc];
+ pep->rx_skb[rx_curr_desc] = NULL;
+
+ rx_next_curr_desc = (rx_curr_desc + 1) % pep->rx_ring_size;
+ pep->rx_curr_desc_q = rx_next_curr_desc;
+
+ /* Rx descriptors exhausted. */
+ /* Set the Rx ring resource error flag */
+ if (rx_next_curr_desc == rx_used_desc)
+ pep->rx_resource_err = 1;
+ pep->rx_desc_count--;
+ dma_unmap_single(NULL, rx_desc->buf_ptr,
+ rx_desc->buf_size,
+ DMA_FROM_DEVICE);
+ received_packets++;
+ /*
+ * Update statistics.
+ * Note byte count includes 4 byte CRC count
+ */
+ stats->rx_packets++;
+ stats->rx_bytes += rx_desc->byte_cnt;
+ /*
+ * In case received a packet without first / last bits on OR
+ * the error summary bit is on, the packets needs to be droped.
+ */
+ if (((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
+ (RX_FIRST_DESC | RX_LAST_DESC))
+ || (cmd_sts & RX_ERROR)) {
+
+ stats->rx_dropped++;
+ if ((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
+ (RX_FIRST_DESC | RX_LAST_DESC)) {
+ if (net_ratelimit())
+ printk(KERN_ERR
+ "%s: Rx pkt on multiple desc\n",
+ dev->name);
+ }
+ if (cmd_sts & RX_ERROR)
+ stats->rx_errors++;
+ dev_kfree_skb_irq(skb);
+ } else {
+ /*
+ * The -4 is for the CRC in the trailer of the
+ * received packet
+ */
+ skb_put(skb, rx_desc->byte_cnt - 4);
+ skb->protocol = eth_type_trans(skb, dev);
+ netif_receive_skb(skb);
+ }
+ dev->last_rx = jiffies;
+ }
+ /* Fill RX ring with skb's */
+ rxq_refill(dev);
+ return received_packets;
+}
+
+static int pxa168_eth_collect_events(struct pxa168_eth_private *pep,
+ struct net_device *dev)
+{
+ u32 icr;
+ int ret = 0;
+
+ icr = rdl(pep, INT_CAUSE);
+ if (icr == 0)
+ return IRQ_NONE;
+
+ wrl(pep, INT_CAUSE, ~icr);
+ if (icr & (ICR_TXBUF_H | ICR_TXBUF_L)) {
+ pep->work_todo |= WORK_TX_DONE;
+ ret = 1;
+ }
+ if (icr & ICR_RXBUF)
+ ret = 1;
+ if (icr & ICR_MII_CH) {
+ pep->work_todo |= WORK_LINK;
+ ret = 1;
+ }
+ return ret;
+}
+
+static void handle_link_event(struct pxa168_eth_private *pep)
+{
+ struct net_device *dev = pep->dev;
+ u32 port_status;
+ int speed;
+ int duplex;
+ int fc;
+
+ port_status = rdl(pep, PORT_STATUS);
+ if (!(port_status & LINK_UP)) {
+ if (netif_carrier_ok(dev)) {
+ printk(KERN_INFO "%s: link down\n", dev->name);
+ netif_carrier_off(dev);
+ txq_reclaim(dev, 1);
+ }
+ return;
+ }
+ if (port_status & PORT_SPEED_100)
+ speed = 100;
+ else
+ speed = 10;
+
+ duplex = (port_status & FULL_DUPLEX) ? 1 : 0;
+ fc = (port_status & FLOW_CONTROL_ENABLED) ? 1 : 0;
+ printk(KERN_INFO "%s: link up, %d Mb/s, %s duplex, "
+ "flow control %sabled\n", dev->name,
+ speed, duplex ? "full" : "half", fc ? "en" : "dis");
+ if (!netif_carrier_ok(dev))
+ netif_carrier_on(dev);
+}
+
+static irqreturn_t pxa168_eth_int_handler(int irq, void *dev_id)
+{
+ struct net_device *dev = (struct net_device *)dev_id;
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+
+ if (unlikely(!pxa168_eth_collect_events(pep, dev)))
+ return IRQ_NONE;
+ /* Disable interrupts */
+ wrl(pep, INT_MASK, 0);
+ napi_schedule(&pep->napi);
+ return IRQ_HANDLED;
+}
+
+static void pxa168_eth_recalc_skb_size(struct pxa168_eth_private *pep)
+{
+ int skb_size;
+
+ /*
+ * Reserve 2+14 bytes for an ethernet header (the hardware
+ * automatically prepends 2 bytes of dummy data to each
+ * received packet), 16 bytes for up to four VLAN tags, and
+ * 4 bytes for the trailing FCS -- 36 bytes total.
+ */
+ skb_size = pep->dev->mtu + 36;
+
+ /*
+ * Make sure that the skb size is a multiple of 8 bytes, as
+ * the lower three bits of the receive descriptor's buffer
+ * size field are ignored by the hardware.
+ */
+ pep->skb_size = (skb_size + 7) & ~7;
+
+ /*
+ * If NET_SKB_PAD is smaller than a cache line,
+ * netdev_alloc_skb() will cause skb->data to be misaligned
+ * to a cache line boundary. If this is the case, include
+ * some extra space to allow re-aligning the data area.
+ */
+ pep->skb_size += SKB_DMA_REALIGN;
+
+}
+
+static int set_port_config_ext(struct pxa168_eth_private *pep)
+{
+ int skb_size;
+
+ pxa168_eth_recalc_skb_size(pep);
+ if (pep->skb_size <= 1518)
+ skb_size = PCXR_MFL_1518;
+ else if (pep->skb_size <= 1536)
+ skb_size = PCXR_MFL_1536;
+ else if (pep->skb_size <= 2048)
+ skb_size = PCXR_MFL_2048;
+ else
+ skb_size = PCXR_MFL_64K;
+
+ /* Extended Port Configuration */
+ wrl(pep,
+ PORT_CONFIG_EXT, PCXR_2BSM | /* Two byte prefix aligns IP hdr */
+ PCXR_DSCP_EN | /* Enable DSCP in IP */
+ skb_size | PCXR_FLP | /* do not force link pass */
+ PCXR_TX_HIGH_PRI); /* Transmit - high priority queue */
+
+ return 0;
+}
+
+static int pxa168_init_hw(struct pxa168_eth_private *pep)
+{
+ int err = 0;
+
+ /* Disable interrupts */
+ wrl(pep, INT_MASK, 0);
+ wrl(pep, INT_CAUSE, 0);
+ /* Write to ICR to clear interrupts. */
+ wrl(pep, INT_W_CLEAR, 0);
+ /* Abort any transmit and receive operations and put DMA
+ * in idle state.
+ */
+ abort_dma(pep);
+ /* Initialize address hash table */
+ err = init_hash_table(pep);
+ if (err)
+ return err;
+ /* SDMA configuration */
+ wrl(pep, SDMA_CONFIG, SDCR_BSZ8 | /* Burst size = 32 bytes */
+ SDCR_RIFB | /* Rx interrupt on frame */
+ SDCR_BLMT | /* Little endian transmit */
+ SDCR_BLMR | /* Little endian receive */
+ SDCR_RC_MAX_RETRANS); /* Max retransmit count */
+ /* Port Configuration */
+ wrl(pep, PORT_CONFIG, PCR_HS); /* Hash size is 1/2kb */
+ set_port_config_ext(pep);
+
+ return err;
+}
+
+static int rxq_init(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ struct rx_desc *p_rx_desc;
+ int size = 0, i = 0;
+ int rx_desc_num = pep->rx_ring_size;
+
+ /* Allocate RX skb rings */
+ pep->rx_skb = kmalloc(sizeof(*pep->rx_skb) * pep->rx_ring_size,
+ GFP_KERNEL);
+ if (!pep->rx_skb) {
+ printk(KERN_ERR "%s: Cannot alloc RX skb ring\n", dev->name);
+ return -ENOMEM;
+ }
+ /* Allocate RX ring */
+ pep->rx_desc_count = 0;
+ size = pep->rx_ring_size * sizeof(struct rx_desc);
+ pep->rx_desc_area_size = size;
+ pep->p_rx_desc_area = dma_alloc_coherent(pep->dev->dev.parent, size,
+ &pep->rx_desc_dma, GFP_KERNEL);
+ if (!pep->p_rx_desc_area) {
+ printk(KERN_ERR "%s: Cannot alloc RX ring (size %d bytes)\n",
+ dev->name, size);
+ goto out;
+ }
+ memset((void *)pep->p_rx_desc_area, 0, size);
+ /* initialize the next_desc_ptr links in the Rx descriptors ring */
+ p_rx_desc = (struct rx_desc *)pep->p_rx_desc_area;
+ for (i = 0; i < rx_desc_num; i++) {
+ p_rx_desc[i].next_desc_ptr = pep->rx_desc_dma +
+ ((i + 1) % rx_desc_num) * sizeof(struct rx_desc);
+ }
+ /* Save Rx desc pointer to driver struct. */
+ pep->rx_curr_desc_q = 0;
+ pep->rx_used_desc_q = 0;
+ pep->rx_desc_area_size = rx_desc_num * sizeof(struct rx_desc);
+ return 0;
+out:
+ kfree(pep->rx_skb);
+ return -ENOMEM;
+}
+
+static void rxq_deinit(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ int curr;
+
+ /* Free preallocated skb's on RX rings */
+ for (curr = 0; pep->rx_desc_count && curr < pep->rx_ring_size; curr++) {
+ if (pep->rx_skb[curr]) {
+ dev_kfree_skb(pep->rx_skb[curr]);
+ pep->rx_desc_count--;
+ }
+ }
+ if (pep->rx_desc_count)
+ printk(KERN_ERR
+ "Error in freeing Rx Ring. %d skb's still\n",
+ pep->rx_desc_count);
+ /* Free RX ring */
+ if (pep->p_rx_desc_area)
+ dma_free_coherent(pep->dev->dev.parent, pep->rx_desc_area_size,
+ pep->p_rx_desc_area, pep->rx_desc_dma);
+ kfree(pep->rx_skb);
+}
+
+static int txq_init(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ struct tx_desc *p_tx_desc;
+ int size = 0, i = 0;
+ int tx_desc_num = pep->tx_ring_size;
+
+ pep->tx_skb = kmalloc(sizeof(*pep->tx_skb) * pep->tx_ring_size,
+ GFP_KERNEL);
+ if (!pep->tx_skb) {
+ printk(KERN_ERR "%s: Cannot alloc TX skb ring\n", dev->name);
+ return -ENOMEM;
+ }
+ /* Allocate TX ring */
+ pep->tx_desc_count = 0;
+ size = pep->tx_ring_size * sizeof(struct tx_desc);
+ pep->tx_desc_area_size = size;
+ pep->p_tx_desc_area = dma_alloc_coherent(pep->dev->dev.parent, size,
+ &pep->tx_desc_dma, GFP_KERNEL);
+ if (!pep->p_tx_desc_area) {
+ printk(KERN_ERR "%s: Cannot allocate Tx Ring (size %d bytes)\n",
+ dev->name, size);
+ goto out;
+ }
+ memset((void *)pep->p_tx_desc_area, 0, pep->tx_desc_area_size);
+ /* Initialize the next_desc_ptr links in the Tx descriptors ring */
+ p_tx_desc = (struct tx_desc *)pep->p_tx_desc_area;
+ for (i = 0; i < tx_desc_num; i++) {
+ p_tx_desc[i].next_desc_ptr = pep->tx_desc_dma +
+ ((i + 1) % tx_desc_num) * sizeof(struct tx_desc);
+ }
+ pep->tx_curr_desc_q = 0;
+ pep->tx_used_desc_q = 0;
+ pep->tx_desc_area_size = tx_desc_num * sizeof(struct tx_desc);
+ return 0;
+out:
+ kfree(pep->tx_skb);
+ return -ENOMEM;
+}
+
+static void txq_deinit(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+
+ /* Free outstanding skb's on TX ring */
+ txq_reclaim(dev, 1);
+ BUG_ON(pep->tx_used_desc_q != pep->tx_curr_desc_q);
+ /* Free TX ring */
+ if (pep->p_tx_desc_area)
+ dma_free_coherent(pep->dev->dev.parent, pep->tx_desc_area_size,
+ pep->p_tx_desc_area, pep->tx_desc_dma);
+ kfree(pep->tx_skb);
+}
+
+static int pxa168_eth_open(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ int err;
+
+ err = request_irq(dev->irq, pxa168_eth_int_handler,
+ IRQF_DISABLED, dev->name, dev);
+ if (err) {
+ dev_printk(KERN_ERR, &dev->dev, "can't assign irq\n");
+ return -EAGAIN;
+ }
+ pep->rx_resource_err = 0;
+ err = rxq_init(dev);
+ if (err != 0)
+ goto out_free_irq;
+ err = txq_init(dev);
+ if (err != 0)
+ goto out_free_rx_skb;
+ pep->rx_used_desc_q = 0;
+ pep->rx_curr_desc_q = 0;
+
+ /* Fill RX ring with skb's */
+ rxq_refill(dev);
+ pep->rx_used_desc_q = 0;
+ pep->rx_curr_desc_q = 0;
+ netif_carrier_off(dev);
+ eth_port_start(dev);
+ napi_enable(&pep->napi);
+ return 0;
+out_free_rx_skb:
+ rxq_deinit(dev);
+out_free_irq:
+ free_irq(dev->irq, dev);
+ return err;
+}
+
+static int pxa168_eth_stop(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ eth_port_reset(dev);
+
+ /* Disable interrupts */
+ wrl(pep, INT_MASK, 0);
+ wrl(pep, INT_CAUSE, 0);
+ /* Write to ICR to clear interrupts. */
+ wrl(pep, INT_W_CLEAR, 0);
+ napi_disable(&pep->napi);
+ del_timer_sync(&pep->timeout);
+ netif_carrier_off(dev);
+ free_irq(dev->irq, dev);
+ rxq_deinit(dev);
+ txq_deinit(dev);
+
+ return 0;
+}
+
+static int pxa168_eth_change_mtu(struct net_device *dev, int mtu)
+{
+ int retval;
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+
+ if ((mtu > 9500) || (mtu < 68))
+ return -EINVAL;
+
+ dev->mtu = mtu;
+ retval = set_port_config_ext(pep);
+
+ if (!netif_running(dev))
+ return 0;
+
+ /*
+ * Stop and then re-open the interface. This will allocate RX
+ * skbs of the new MTU.
+ * There is a possible danger that the open will not succeed,
+ * due to memory being full.
+ */
+ pxa168_eth_stop(dev);
+ if (pxa168_eth_open(dev)) {
+ dev_printk(KERN_ERR, &dev->dev,
+ "fatal error on re-opening device after "
+ "MTU change\n");
+ }
+
+ return 0;
+}
+
+static int eth_alloc_tx_desc_index(struct pxa168_eth_private *pep)
+{
+ int tx_desc_curr;
+
+ tx_desc_curr = pep->tx_curr_desc_q;
+ pep->tx_curr_desc_q = (tx_desc_curr + 1) % pep->tx_ring_size;
+ BUG_ON(pep->tx_curr_desc_q == pep->tx_used_desc_q);
+ pep->tx_desc_count++;
+
+ return tx_desc_curr;
+}
+
+static int pxa168_rx_poll(struct napi_struct *napi, int budget)
+{
+ struct pxa168_eth_private *pep =
+ container_of(napi, struct pxa168_eth_private, napi);
+ struct net_device *dev = pep->dev;
+ int work_done = 0;
+
+ if (unlikely(pep->work_todo & WORK_LINK)) {
+ pep->work_todo &= ~(WORK_LINK);
+ handle_link_event(pep);
+ }
+ /*
+ * We call txq_reclaim every time since in NAPI interupts are disabled
+ * and due to this we miss the TX_DONE interrupt,which is not updated in
+ * interrupt status register.
+ */
+ txq_reclaim(dev, 0);
+ if (netif_queue_stopped(dev)
+ && pep->tx_ring_size - pep->tx_desc_count > 1) {
+ netif_wake_queue(dev);
+ }
+ work_done = rxq_process(dev, budget);
+ if (work_done < budget) {
+ napi_complete(napi);
+ wrl(pep, INT_MASK, ALL_INTS);
+ }
+
+ return work_done;
+}
+
+static int pxa168_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ struct net_device_stats *stats = &dev->stats;
+ struct tx_desc *desc;
+ int tx_index;
+ int length;
+
+ tx_index = eth_alloc_tx_desc_index(pep);
+ desc = &pep->p_tx_desc_area[tx_index];
+ length = skb->len;
+ pep->tx_skb[tx_index] = skb;
+ desc->byte_cnt = length;
+ desc->buf_ptr = dma_map_single(NULL, skb->data, length, DMA_TO_DEVICE);
+ wmb();
+ desc->cmd_sts = BUF_OWNED_BY_DMA | TX_GEN_CRC | TX_FIRST_DESC |
+ TX_ZERO_PADDING | TX_LAST_DESC | TX_EN_INT;
+ wmb();
+ wrl(pep, SDMA_CMD, SDMA_CMD_TXDH | SDMA_CMD_ERD);
+
+ stats->tx_bytes += skb->len;
+ stats->tx_packets++;
+ dev->trans_start = jiffies;
+ if (pep->tx_ring_size - pep->tx_desc_count <= 1) {
+ /* We handled the current skb, but now we are out of space.*/
+ netif_stop_queue(dev);
+ }
+
+ return NETDEV_TX_OK;
+}
+
+static int smi_wait_ready(struct pxa168_eth_private *pep)
+{
+ int i = 0;
+
+ /* wait for the SMI register to become available */
+ for (i = 0; rdl(pep, SMI) & SMI_BUSY; i++) {
+ if (i == PHY_WAIT_ITERATIONS)
+ return -ETIMEDOUT;
+ msleep(10);
+ }
+
+ return 0;
+}
+
+static int pxa168_smi_read(struct mii_bus *bus, int phy_addr, int regnum)
+{
+ struct pxa168_eth_private *pep = bus->priv;
+ int i = 0;
+ int val;
+
+ if (smi_wait_ready(pep)) {
+ printk(KERN_WARNING "pxa168_eth: SMI bus busy timeout\n");
+ return -ETIMEDOUT;
+ }
+ wrl(pep, SMI, (phy_addr << 16) | (regnum << 21) | SMI_OP_R);
+ /* now wait for the data to be valid */
+ for (i = 0; !((val = rdl(pep, SMI)) & SMI_R_VALID); i++) {
+ if (i == PHY_WAIT_ITERATIONS) {
+ printk(KERN_WARNING
+ "pxa168_eth: SMI bus read not valid\n");
+ return -ENODEV;
+ }
+ msleep(10);
+ }
+
+ return val & 0xffff;
+}
+
+static int pxa168_smi_write(struct mii_bus *bus, int phy_addr, int regnum,
+ u16 value)
+{
+ struct pxa168_eth_private *pep = bus->priv;
+
+ if (smi_wait_ready(pep)) {
+ printk(KERN_WARNING "pxa168_eth: SMI bus busy timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ wrl(pep, SMI, (phy_addr << 16) | (regnum << 21) |
+ SMI_OP_W | (value & 0xffff));
+
+ if (smi_wait_ready(pep)) {
+ printk(KERN_ERR "pxa168_eth: SMI bus busy timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int pxa168_eth_do_ioctl(struct net_device *dev, struct ifreq *ifr,
+ int cmd)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ if (pep->phy != NULL)
+ return phy_mii_ioctl(pep->phy, if_mii(ifr), cmd);
+
+ return -EOPNOTSUPP;
+}
+
+static struct phy_device *phy_scan(struct pxa168_eth_private *pep, int phy_addr)
+{
+ struct mii_bus *bus = pep->smi_bus;
+ struct phy_device *phydev;
+ int start;
+ int num;
+ int i;
+
+ if (phy_addr == PXA168_ETH_PHY_ADDR_DEFAULT) {
+ /* Scan entire range */
+ start = ethernet_phy_get(pep);
+ num = 32;
+ } else {
+ /* Use phy addr specific to platform */
+ start = phy_addr & 0x1f;
+ num = 1;
+ }
+ phydev = NULL;
+ for (i = 0; i < num; i++) {
+ int addr = (start + i) & 0x1f;
+ if (bus->phy_map[addr] == NULL)
+ mdiobus_scan(bus, addr);
+
+ if (phydev == NULL) {
+ phydev = bus->phy_map[addr];
+ if (phydev != NULL)
+ ethernet_phy_set_addr(pep, addr);
+ }
+ }
+
+ return phydev;
+}
+
+static void phy_init(struct pxa168_eth_private *pep, int speed, int duplex)
+{
+ struct phy_device *phy = pep->phy;
+ ethernet_phy_reset(pep);
+
+ phy_attach(pep->dev, dev_name(&phy->dev), 0, PHY_INTERFACE_MODE_MII);
+
+ if (speed == 0) {
+ phy->autoneg = AUTONEG_ENABLE;
+ phy->speed = 0;
+ phy->duplex = 0;
+ phy->supported &= PHY_BASIC_FEATURES;
+ phy->advertising = phy->supported | ADVERTISED_Autoneg;
+ } else {
+ phy->autoneg = AUTONEG_DISABLE;
+ phy->advertising = 0;
+ phy->speed = speed;
+ phy->duplex = duplex;
+ }
+ phy_start_aneg(phy);
+}
+
+static int ethernet_phy_setup(struct net_device *dev)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+
+ if (pep->pd != NULL) {
+ if (pep->pd->init)
+ pep->pd->init();
+ }
+ pep->phy = phy_scan(pep, pep->pd->phy_addr & 0x1f);
+ if (pep->phy != NULL)
+ phy_init(pep, pep->pd->speed, pep->pd->duplex);
+ update_hash_table_mac_address(pep, NULL, dev->dev_addr);
+
+ return 0;
+}
+
+static int pxa168_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+ int err;
+
+ err = phy_read_status(pep->phy);
+ if (err == 0)
+ err = phy_ethtool_gset(pep->phy, cmd);
+
+ return err;
+}
+
+static int pxa168_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+
+ return phy_ethtool_sset(pep->phy, cmd);
+}
+
+static void pxa168_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strncpy(info->driver, DRIVER_NAME, 32);
+ strncpy(info->version, DRIVER_VERSION, 32);
+ strncpy(info->fw_version, "N/A", 32);
+ strncpy(info->bus_info, "N/A", 32);
+}
+
+static u32 pxa168_get_link(struct net_device *dev)
+{
+ return !!netif_carrier_ok(dev);
+}
+
+static const struct ethtool_ops pxa168_ethtool_ops = {
+ .get_settings = pxa168_get_settings,
+ .set_settings = pxa168_set_settings,
+ .get_drvinfo = pxa168_get_drvinfo,
+ .get_link = pxa168_get_link,
+};
+
+static const struct net_device_ops pxa168_eth_netdev_ops = {
+ .ndo_open = pxa168_eth_open,
+ .ndo_stop = pxa168_eth_stop,
+ .ndo_start_xmit = pxa168_eth_start_xmit,
+ .ndo_set_rx_mode = pxa168_eth_set_rx_mode,
+ .ndo_set_mac_address = pxa168_eth_set_mac_address,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_do_ioctl = pxa168_eth_do_ioctl,
+ .ndo_change_mtu = pxa168_eth_change_mtu,
+ .ndo_tx_timeout = pxa168_eth_tx_timeout,
+};
+
+static int pxa168_eth_probe(struct platform_device *pdev)
+{
+ struct pxa168_eth_private *pep = NULL;
+ struct net_device *dev = NULL;
+ struct resource *res;
+ struct clk *clk;
+ int err;
+
+ printk(KERN_NOTICE "PXA168 10/100 Ethernet Driver\n");
+
+ clk = clk_get(&pdev->dev, "MFUCLK");
+ if (IS_ERR(clk)) {
+ printk(KERN_ERR "%s: Fast Ethernet failed to get clock\n",
+ DRIVER_NAME);
+ return -ENODEV;
+ }
+ clk_enable(clk);
+
+ dev = alloc_etherdev(sizeof(struct pxa168_eth_private));
+ if (!dev) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ platform_set_drvdata(pdev, dev);
+ pep = netdev_priv(dev);
+ pep->dev = dev;
+ pep->clk = clk;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ err = -ENODEV;
+ goto out;
+ }
+ pep->base = ioremap(res->start, res->end - res->start + 1);
+ if (pep->base == NULL) {
+ err = -ENOMEM;
+ goto out;
+ }
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ BUG_ON(!res);
+ dev->irq = res->start;
+ dev->netdev_ops = &pxa168_eth_netdev_ops;
+ dev->watchdog_timeo = 2 * HZ;
+ dev->base_addr = 0;
+ SET_ETHTOOL_OPS(dev, &pxa168_ethtool_ops);
+
+ INIT_WORK(&pep->tx_timeout_task, pxa168_eth_tx_timeout_task);
+
+ printk(KERN_INFO "%s:Using random mac address\n", DRIVER_NAME);
+ random_ether_addr(dev->dev_addr);
+
+ pep->pd = pdev->dev.platform_data;
+ pep->rx_ring_size = NUM_RX_DESCS;
+ if (pep->pd->rx_queue_size)
+ pep->rx_ring_size = pep->pd->rx_queue_size;
+
+ pep->tx_ring_size = NUM_TX_DESCS;
+ if (pep->pd->tx_queue_size)
+ pep->tx_ring_size = pep->pd->tx_queue_size;
+
+ pep->port_num = pep->pd->port_number;
+ /* Hardware supports only 3 ports */
+ BUG_ON(pep->port_num > 2);
+ netif_napi_add(dev, &pep->napi, pxa168_rx_poll, pep->rx_ring_size);
+
+ memset(&pep->timeout, 0, sizeof(struct timer_list));
+ init_timer(&pep->timeout);
+ pep->timeout.function = rxq_refill_timer_wrapper;
+ pep->timeout.data = (unsigned long)pep;
+
+ pep->smi_bus = mdiobus_alloc();
+ if (pep->smi_bus == NULL) {
+ err = -ENOMEM;
+ goto out;
+ }
+ pep->smi_bus->priv = pep;
+ pep->smi_bus->name = "pxa168_eth smi";
+ pep->smi_bus->read = pxa168_smi_read;
+ pep->smi_bus->write = pxa168_smi_write;
+ snprintf(pep->smi_bus->id, MII_BUS_ID_SIZE, "%d", pdev->id);
+ pep->smi_bus->parent = &pdev->dev;
+ pep->smi_bus->phy_mask = 0xffffffff;
+ if (mdiobus_register(pep->smi_bus) < 0) {
+ err = -ENOMEM;
+ goto out;
+ }
+ pxa168_init_hw(pep);
+ err = ethernet_phy_setup(dev);
+ if (err)
+ goto out;
+ SET_NETDEV_DEV(dev, &pdev->dev);
+ err = register_netdev(dev);
+ if (err)
+ goto out;
+ return 0;
+out:
+ if (pep->clk) {
+ clk_disable(pep->clk);
+ clk_put(pep->clk);
+ pep->clk = NULL;
+ }
+ if (pep->base) {
+ iounmap(pep->base);
+ pep->base = NULL;
+ }
+ if (dev)
+ free_netdev(dev);
+ return err;
+}
+
+static int pxa168_eth_remove(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct pxa168_eth_private *pep = netdev_priv(dev);
+
+ if (pep->htpr) {
+ dma_free_coherent(pep->dev->dev.parent, HASH_ADDR_TABLE_SIZE,
+ pep->htpr, pep->htpr_dma);
+ pep->htpr = NULL;
+ }
+ if (pep->clk) {
+ clk_disable(pep->clk);
+ clk_put(pep->clk);
+ pep->clk = NULL;
+ }
+ if (pep->phy != NULL)
+ phy_detach(pep->phy);
+
+ iounmap(pep->base);
+ pep->base = NULL;
+ unregister_netdev(dev);
+ flush_scheduled_work();
+ free_netdev(dev);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static void pxa168_eth_shutdown(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ eth_port_reset(dev);
+}
+
+#ifdef CONFIG_PM
+static int pxa168_eth_resume(struct platform_device *pdev)
+{
+ return -ENOSYS;
+}
+
+static int pxa168_eth_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ return -ENOSYS;
+}
+
+#else
+#define pxa168_eth_resume NULL
+#define pxa168_eth_suspend NULL
+#endif
+
+static struct platform_driver pxa168_eth_driver = {
+ .probe = pxa168_eth_probe,
+ .remove = pxa168_eth_remove,
+ .shutdown = pxa168_eth_shutdown,
+ .resume = pxa168_eth_resume,
+ .suspend = pxa168_eth_suspend,
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+static int __init pxa168_init_module(void)
+{
+ return platform_driver_register(&pxa168_eth_driver);
+}
+
+static void __exit pxa168_cleanup_module(void)
+{
+ platform_driver_unregister(&pxa168_eth_driver);
+}
+
+module_init(pxa168_init_module);
+module_exit(pxa168_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Ethernet driver for Marvell PXA168");
+MODULE_ALIAS("platform:pxa168_eth");
diff --git a/include/linux/pxa168_eth.h b/include/linux/pxa168_eth.h
new file mode 100644
index 0000000..18d75e7
--- /dev/null
+++ b/include/linux/pxa168_eth.h
@@ -0,0 +1,30 @@
+/*
+ *pxa168 ethernet platform device data definition file.
+ */
+#ifndef __LINUX_PXA168_ETH_H
+#define __LINUX_PXA168_ETH_H
+
+struct pxa168_eth_platform_data {
+ int port_number;
+ int phy_addr;
+
+ /*
+ * If speed is 0, then speed and duplex are autonegotiated.
+ */
+ int speed; /* 0, SPEED_10, SPEED_100 */
+ int duplex; /* DUPLEX_HALF or DUPLEX_FULL */
+
+ /*
+ * Override default RX/TX queue sizes if nonzero.
+ */
+ int rx_queue_size;
+ int tx_queue_size;
+
+ /*
+ * init callback is used for board specific initialization
+ * e.g on Aspenite its used to initialize the PHY transceiver.
+ */
+ int (*init)(void);
+};
+
+#endif /* __LINUX_PXA168_ETH_H */
--
1.5.3.3
--
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