- 根目录:
- drivers
- net
- ethernet
- allwinner
- sun4i-emac.c
/*
* Allwinner EMAC Fast Ethernet driver for Linux.
*
* Copyright 2012-2013 Stefan Roese <sr@denx.de>
* Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
*
* Based on the Linux driver provided by Allwinner:
* Copyright (C) 1997 Sten Wang
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
#include "sun4i-emac.h"
#define DRV_NAME "sun4i-emac"
#define DRV_VERSION "1.02"
#define EMAC_MAX_FRAME_LEN 0x0600
/* Transmit timeout, default 5 seconds. */
static int watchdog = 5000;
module_param(watchdog, int, 0400);
MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");
/* EMAC register address locking.
*
* The EMAC uses an address register to control where data written
* to the data register goes. This means that the address register
* must be preserved over interrupts or similar calls.
*
* During interrupt and other critical calls, a spinlock is used to
* protect the system, but the calls themselves save the address
* in the address register in case they are interrupting another
* access to the device.
*
* For general accesses a lock is provided so that calls which are
* allowed to sleep are serialised so that the address register does
* not need to be saved. This lock also serves to serialise access
* to the EEPROM and PHY access registers which are shared between
* these two devices.
*/
/* The driver supports the original EMACE, and now the two newer
* devices, EMACA and EMACB.
*/
struct emac_board_info {
struct clk *clk;
struct device *dev;
struct platform_device *pdev;
spinlock_t lock;
void __iomem *membase;
u32 msg_enable;
struct net_device *ndev;
struct sk_buff *skb_last;
u16 tx_fifo_stat;
int emacrx_completed_flag;
struct phy_device *phy_dev;
struct device_node *phy_node;
unsigned int link;
unsigned int speed;
unsigned int duplex;
phy_interface_t phy_interface;
};
static void emac_update_speed(struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
unsigned int reg_val;
/* set EMAC SPEED, depend on PHY */
reg_val = readl(db->membase + EMAC_MAC_SUPP_REG);
reg_val &= ~(0x1 << 8);
if (db->speed == SPEED_100)
reg_val |= 1 << 8;
writel(reg_val, db->membase + EMAC_MAC_SUPP_REG);
}
static void emac_update_duplex(struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
unsigned int reg_val;
/* set duplex depend on phy */
reg_val = readl(db->membase + EMAC_MAC_CTL1_REG);
reg_val &= ~EMAC_MAC_CTL1_DUPLEX_EN;
if (db->duplex)
reg_val |= EMAC_MAC_CTL1_DUPLEX_EN;
writel(reg_val, db->membase + EMAC_MAC_CTL1_REG);
}
static void emac_handle_link_change(struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
struct phy_device *phydev = db->phy_dev;
unsigned long flags;
int status_change = 0;
if (phydev->link) {
if (db->speed != phydev->speed) {
spin_lock_irqsave(&db->lock, flags);
db->speed = phydev->speed;
emac_update_speed(dev);
spin_unlock_irqrestore(&db->lock, flags);
status_change = 1;
}
if (db->duplex != phydev->duplex) {
spin_lock_irqsave(&db->lock, flags);
db->duplex = phydev->duplex;
emac_update_duplex(dev);
spin_unlock_irqrestore(&db->lock, flags);
status_change = 1;
}
}
if (phydev->link != db->link) {
if (!phydev->link) {
db->speed = 0;
db->duplex = -1;
}
db->link = phydev->link;
status_change = 1;
}
if (status_change)
phy_print_status(phydev);
}
static int emac_mdio_probe(struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
/* to-do: PHY interrupts are currently not supported */
/* attach the mac to the phy */
db->phy_dev = of_phy_connect(db->ndev, db->phy_node,
&emac_handle_link_change, 0,
db->phy_interface);
if (!db->phy_dev) {
netdev_err(db->ndev, "could not find the PHY\n");
return -ENODEV;
}
/* mask with MAC supported features */
db->phy_dev->supported &= PHY_BASIC_FEATURES;
db->phy_dev->advertising = db->phy_dev->supported;
db->link = 0;
db->speed = 0;
db->duplex = -1;
return 0;
}
static void emac_mdio_remove(struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
phy_disconnect(db->phy_dev);
db->phy_dev = NULL;
}
static void emac_reset(struct emac_board_info *db)
{
dev_dbg(db->dev, "resetting device\n");
/* RESET device */
writel(0, db->membase + EMAC_CTL_REG);
udelay(200);
writel(EMAC_CTL_RESET, db->membase + EMAC_CTL_REG);
udelay(200);
}
static void emac_outblk_32bit(void __iomem *reg, void *data, int count)
{
writesl(reg, data, round_up(count, 4) / 4);
}
static void emac_inblk_32bit(void __iomem *reg, void *data, int count)
{
readsl(reg, data, round_up(count, 4) / 4);
}
static int emac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct emac_board_info *dm = netdev_priv(dev);
struct phy_device *phydev = dm->phy_dev;
if (!netif_running(dev))
return -EINVAL;
if (!phydev)
return -ENODEV;
return phy_mii_ioctl(phydev, rq, cmd);
}
/* ethtool ops */
static void emac_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strlcpy(info->driver, DRV_NAME, sizeof(DRV_NAME));
strlcpy(info->version, DRV_VERSION, sizeof(DRV_VERSION));
strlcpy(info->bus_info, dev_name(&dev->dev), sizeof(info->bus_info));
}
static int emac_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct emac_board_info *dm = netdev_priv(dev);
struct phy_device *phydev = dm->phy_dev;
if (!phydev)
return -ENODEV;
return phy_ethtool_gset(phydev, cmd);
}
static int emac_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct emac_board_info *dm = netdev_priv(dev);
struct phy_device *phydev = dm->phy_dev;
if (!phydev)
return -ENODEV;
return phy_ethtool_sset(phydev, cmd);
}
static const struct ethtool_ops emac_ethtool_ops = {
.get_drvinfo = emac_get_drvinfo,
.get_settings = emac_get_settings,
.set_settings = emac_set_settings,
.get_link = ethtool_op_get_link,
};
static unsigned int emac_setup(struct net_device *ndev)
{
struct emac_board_info *db = netdev_priv(ndev);
unsigned int reg_val;
/* set up TX */
reg_val = readl(db->membase + EMAC_TX_MODE_REG);
writel(reg_val | EMAC_TX_MODE_ABORTED_FRAME_EN,
db->membase + EMAC_TX_MODE_REG);
/* set up RX */
reg_val = readl(db->membase + EMAC_RX_CTL_REG);
writel(reg_val | EMAC_RX_CTL_PASS_LEN_OOR_EN |
EMAC_RX_CTL_ACCEPT_UNICAST_EN | EMAC_RX_CTL_DA_FILTER_EN |
EMAC_RX_CTL_ACCEPT_MULTICAST_EN |
EMAC_RX_CTL_ACCEPT_BROADCAST_EN,
db->membase + EMAC_RX_CTL_REG);
/* set MAC */
/* set MAC CTL0 */
reg_val = readl(db->membase + EMAC_MAC_CTL0_REG);
writel(reg_val | EMAC_MAC_CTL0_RX_FLOW_CTL_EN |
EMAC_MAC_CTL0_TX_FLOW_CTL_EN,
db->membase + EMAC_MAC_CTL0_REG);
/* set MAC CTL1 */
reg_val = readl(db->membase + EMAC_MAC_CTL1_REG);
reg_val |= EMAC_MAC_CTL1_LEN_CHECK_EN;
reg_val |= EMAC_MAC_CTL1_CRC_EN;
reg_val |= EMAC_MAC_CTL1_PAD_EN;
writel(reg_val, db->membase + EMAC_MAC_CTL1_REG);
/* set up IPGT */
writel(EMAC_MAC_IPGT_FULL_DUPLEX, db->membase + EMAC_MAC_IPGT_REG);
/* set up IPGR */
writel((EMAC_MAC_IPGR_IPG1 << 8) | EMAC_MAC_IPGR_IPG2,
db->membase + EMAC_MAC_IPGR_REG);
/* set up Collison window */
writel((EMAC_MAC_CLRT_COLLISION_WINDOW << 8) | EMAC_MAC_CLRT_RM,
db->membase + EMAC_MAC_CLRT_REG);
/* set up Max Frame Length */
writel(EMAC_MAX_FRAME_LEN,
db->membase + EMAC_MAC_MAXF_REG);
return 0;
}
static unsigned int emac_powerup(struct net_device *ndev)
{
struct emac_board_info *db = netdev_priv(ndev);
unsigned int reg_val;
/* initial EMAC */
/* flush RX FIFO */
reg_val = readl(db->membase + EMAC_RX_CTL_REG);
reg_val |= 0x8;
writel(reg_val, db->membase + EMAC_RX_CTL_REG);
udelay(1);
/* initial MAC */
/* soft reset MAC */
reg_val = readl(db->membase + EMAC_MAC_CTL0_REG);
reg_val &= ~EMAC_MAC_CTL0_SOFT_RESET;
writel(reg_val, db->membase + EMAC_MAC_CTL0_REG);
/* set MII clock */
reg_val = readl(db->membase + EMAC_MAC_MCFG_REG);
reg_val &= (~(0xf << 2));
reg_val |= (0xD << 2);
writel(reg_val, db->membase + EMAC_MAC_MCFG_REG);
/* clear RX counter */
writel(0x0, db->membase + EMAC_RX_FBC_REG);
/* disable all interrupt and clear interrupt status */
writel(0, db->membase + EMAC_INT_CTL_REG);
reg_val = readl(db->membase + EMAC_INT_STA_REG);
writel(reg_val, db->membase + EMAC_INT_STA_REG);
udelay(1);
/* set up EMAC */
emac_setup(ndev);
/* set mac_address to chip */
writel(ndev->dev_addr[0] << 16 | ndev->dev_addr[1] << 8 | ndev->
dev_addr[2], db->membase + EMAC_MAC_A1_REG);
writel(ndev->dev_addr[3] << 16 | ndev->dev_addr[4] << 8 | ndev->
dev_addr[5], db->membase + EMAC_MAC_A0_REG);
mdelay(1);
return 0;
}
static int emac_set_mac_address(struct net_device *dev, void *p)
{
struct sockaddr *addr = p;
struct emac_board_info *db = netdev_priv(dev);
if (netif_running(dev))
return -EBUSY;
memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
writel(dev->dev_addr[0] << 16 | dev->dev_addr[1] << 8 | dev->
dev_addr[2], db->membase + EMAC_MAC_A1_REG);
writel(dev->dev_addr[3] << 16 | dev->dev_addr[4] << 8 | dev->
dev_addr[5], db->membase + EMAC_MAC_A0_REG);
return 0;
}
/* Initialize emac board */
static void emac_init_device(struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
unsigned long flags;
unsigned int reg_val;
spin_lock_irqsave(&db->lock, flags);
emac_update_speed(dev);
emac_update_duplex(dev);
/* enable RX/TX */
reg_val = readl(db->membase + EMAC_CTL_REG);
writel(reg_val | EMAC_CTL_RESET | EMAC_CTL_TX_EN | EMAC_CTL_RX_EN,
db->membase + EMAC_CTL_REG);
/* enable RX/TX0/RX Hlevel interrup */
reg_val = readl(db->membase + EMAC_INT_CTL_REG);
reg_val |= (0xf << 0) | (0x01 << 8);
writel(reg_val, db->membase + EMAC_INT_CTL_REG);
spin_unlock_irqrestore(&db->lock, flags);
}
/* Our watchdog timed out. Called by the networking layer */
static void emac_timeout(struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
unsigned long flags;
if (netif_msg_timer(db))
dev_err(db->dev, "tx time out.\n");
/* Save previous register address */
spin_lock_irqsave(&db->lock, flags);
netif_stop_queue(dev);
emac_reset(db);
emac_init_device(dev);
/* We can accept TX packets again */
dev->trans_start = jiffies;
netif_wake_queue(dev);
/* Restore previous register address */
spin_unlock_irqrestore(&db->lock, flags);
}
/* Hardware start transmission.
* Send a packet to media from the upper layer.
*/
static int emac_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
unsigned long channel;
unsigned long flags;
channel = db->tx_fifo_stat & 3;
if (channel == 3)
return 1;
channel = (channel == 1 ? 1 : 0);
spin_lock_irqsave(&db->lock, flags);
writel(channel, db->membase + EMAC_TX_INS_REG);
emac_outblk_32bit(db->membase + EMAC_TX_IO_DATA_REG,
skb->data, skb->len);
dev->stats.tx_bytes += skb->len;
db->tx_fifo_stat |= 1 << channel;
/* TX control: First packet immediately send, second packet queue */
if (channel == 0) {
/* set TX len */
writel(skb->len, db->membase + EMAC_TX_PL0_REG);
/* start translate from fifo to phy */
writel(readl(db->membase + EMAC_TX_CTL0_REG) | 1,
db->membase + EMAC_TX_CTL0_REG);
/* save the time stamp */
dev->trans_start = jiffies;
} else if (channel == 1) {
/* set TX len */
writel(skb->len, db->membase + EMAC_TX_PL1_REG);
/* start translate from fifo to phy */
writel(readl(db->membase + EMAC_TX_CTL1_REG) | 1,
db->membase + EMAC_TX_CTL1_REG);
/* save the time stamp */
dev->trans_start = jiffies;
}
if ((db->tx_fifo_stat & 3) == 3) {
/* Second packet */
netif_stop_queue(dev);
}
spin_unlock_irqrestore(&db->lock, flags);
/* free this SKB */
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
/* EMAC interrupt handler
* receive the packet to upper layer, free the transmitted packet
*/
static void emac_tx_done(struct net_device *dev, struct emac_board_info *db,
unsigned int tx_status)
{
/* One packet sent complete */
db->tx_fifo_stat &= ~(tx_status & 3);
if (3 == (tx_status & 3))
dev->stats.tx_packets += 2;
else
dev->stats.tx_packets++;
if (netif_msg_tx_done(db))
dev_dbg(db->dev, "tx done, NSR %02x\n", tx_status);
netif_wake_queue(dev);
}
/* Received a packet and pass to upper layer
*/
static void emac_rx(struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
struct sk_buff *skb;
u8 *rdptr;
bool good_packet;
static int rxlen_last;
unsigned int reg_val;
u32 rxhdr, rxstatus, rxcount, rxlen;
/* Check packet ready or not */
while (1) {
/* race warning: the first packet might arrive with
* the interrupts disabled, but the second will fix
* it
*/
rxcount = readl(db->membase + EMAC_RX_FBC_REG);
if (netif_msg_rx_status(db))
dev_dbg(db->dev, "RXCount: %x\n", rxcount);
if ((db->skb_last != NULL) && (rxlen_last > 0)) {
dev->stats.rx_bytes += rxlen_last;
/* Pass to upper layer */
db->skb_last->protocol = eth_type_trans(db->skb_last,
dev);
netif_rx(db->skb_last);
dev->stats.rx_packets++;
db->skb_last = NULL;
rxlen_last = 0;
reg_val = readl(db->membase + EMAC_RX_CTL_REG);
reg_val &= ~EMAC_RX_CTL_DMA_EN;
writel(reg_val, db->membase + EMAC_RX_CTL_REG);
}
if (!rxcount) {
db->emacrx_completed_flag = 1;
reg_val = readl(db->membase + EMAC_INT_CTL_REG);
reg_val |= (0xf << 0) | (0x01 << 8);
writel(reg_val, db->membase + EMAC_INT_CTL_REG);
/* had one stuck? */
rxcount = readl(db->membase + EMAC_RX_FBC_REG);
if (!rxcount)
return;
}
reg_val = readl(db->membase + EMAC_RX_IO_DATA_REG);
if (netif_msg_rx_status(db))
dev_dbg(db->dev, "receive header: %x\n", reg_val);
if (reg_val != EMAC_UNDOCUMENTED_MAGIC) {
/* disable RX */
reg_val = readl(db->membase + EMAC_CTL_REG);
writel(reg_val & ~EMAC_CTL_RX_EN,
db->membase + EMAC_CTL_REG);
/* Flush RX FIFO */
reg_val = readl(db->membase + EMAC_RX_CTL_REG);
writel(reg_val | (1 << 3),
db->membase + EMAC_RX_CTL_REG);
do {
reg_val = readl(db->membase + EMAC_RX_CTL_REG);
} while (reg_val & (1 << 3));
/* enable RX */
reg_val = readl(db->membase + EMAC_CTL_REG);
writel(reg_val | EMAC_CTL_RX_EN,
db->membase + EMAC_CTL_REG);
reg_val = readl(db->membase + EMAC_INT_CTL_REG);
reg_val |= (0xf << 0) | (0x01 << 8);
writel(reg_val, db->membase + EMAC_INT_CTL_REG);
db->emacrx_completed_flag = 1;
return;
}
/* A packet ready now & Get status/length */
good_packet = true;
emac_inblk_32bit(db->membase + EMAC_RX_IO_DATA_REG,
&rxhdr, sizeof(rxhdr));
if (netif_msg_rx_status(db))
dev_dbg(db->dev, "rxhdr: %x\n", *((int *)(&rxhdr)));
rxlen = EMAC_RX_IO_DATA_LEN(rxhdr);
rxstatus = EMAC_RX_IO_DATA_STATUS(rxhdr);
if (netif_msg_rx_status(db))
dev_dbg(db->dev, "RX: status %02x, length %04x\n",
rxstatus, rxlen);
/* Packet Status check */
if (rxlen < 0x40) {
good_packet = false;
if (netif_msg_rx_err(db))
dev_dbg(db->dev, "RX: Bad Packet (runt)\n");
}
if (unlikely(!(rxstatus & EMAC_RX_IO_DATA_STATUS_OK))) {
good_packet = false;
if (rxstatus & EMAC_RX_IO_DATA_STATUS_CRC_ERR) {
if (netif_msg_rx_err(db))
dev_dbg(db->dev, "crc error\n");
dev->stats.rx_crc_errors++;
}
if (rxstatus & EMAC_RX_IO_DATA_STATUS_LEN_ERR) {
if (netif_msg_rx_err(db))
dev_dbg(db->dev, "length error\n");
dev->stats.rx_length_errors++;
}
}
/* Move data from EMAC */
skb = dev_alloc_skb(rxlen + 4);
if (good_packet && skb) {
skb_reserve(skb, 2);
rdptr = (u8 *) skb_put(skb, rxlen - 4);
/* Read received packet from RX SRAM */
if (netif_msg_rx_status(db))
dev_dbg(db->dev, "RxLen %x\n", rxlen);
emac_inblk_32bit(db->membase + EMAC_RX_IO_DATA_REG,
rdptr, rxlen);
dev->stats.rx_bytes += rxlen;
/* Pass to upper layer */
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
dev->stats.rx_packets++;
}
}
}
static irqreturn_t emac_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct emac_board_info *db = netdev_priv(dev);
int int_status;
unsigned long flags;
unsigned int reg_val;
/* A real interrupt coming */
/* holders of db->lock must always block IRQs */
spin_lock_irqsave(&db->lock, flags);
/* Disable all interrupts */
writel(0, db->membase + EMAC_INT_CTL_REG);
/* Got EMAC interrupt status */
/* Got ISR */
int_status = readl(db->membase + EMAC_INT_STA_REG);
/* Clear ISR status */
writel(int_status, db->membase + EMAC_INT_STA_REG);
if (netif_msg_intr(db))
dev_dbg(db->dev, "emac interrupt %02x\n", int_status);
/* Received the coming packet */
if ((int_status & 0x100) && (db->emacrx_completed_flag == 1)) {
/* carrier lost */
db->emacrx_completed_flag = 0;
emac_rx(dev);
}
/* Transmit Interrupt check */
if (int_status & (0x01 | 0x02))
emac_tx_done(dev, db, int_status);
if (int_status & (0x04 | 0x08))
netdev_info(dev, " ab : %x\n", int_status);
/* Re-enable interrupt mask */
if (db->emacrx_completed_flag == 1) {
reg_val = readl(db->membase + EMAC_INT_CTL_REG);
reg_val |= (0xf << 0) | (0x01 << 8);
writel(reg_val, db->membase + EMAC_INT_CTL_REG);
}
spin_unlock_irqrestore(&db->lock, flags);
return IRQ_HANDLED;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
/*
* Used by netconsole
*/
static void emac_poll_controller(struct net_device *dev)
{
disable_irq(dev->irq);
emac_interrupt(dev->irq, dev);
enable_irq(dev->irq);
}
#endif
/* Open the interface.
* The interface is opened whenever "ifconfig" actives it.
*/
static int emac_open(struct net_device *dev)
{
struct emac_board_info *db = netdev_priv(dev);
int ret;
if (netif_msg_ifup(db))
dev_dbg(db->dev, "enabling %s\n", dev->name);
if (request_irq(dev->irq, &emac_interrupt, 0, dev->name, dev))
return -EAGAIN;
/* Initialize EMAC board */
emac_reset(db);
emac_init_device(dev);
ret = emac_mdio_probe(dev);
if (ret < 0) {
netdev_err(dev, "cannot probe MDIO bus\n");
return ret;
}
phy_start(db->phy_dev);
netif_start_queue(dev);
return 0;
}
static void emac_shutdown(struct net_device *dev)
{
unsigned int reg_val;
struct emac_board_info *db = netdev_priv(dev);
/* Disable all interrupt */
writel(0, db->membase + EMAC_INT_CTL_REG);
/* clear interupt status */
reg_val = readl(db->membase + EMAC_INT_STA_REG);
writel(reg_val, db->membase + EMAC_INT_STA_REG);
/* Disable RX/TX */
reg_val = readl(db->membase + EMAC_CTL_REG);
reg_val &= ~(EMAC_CTL_TX_EN | EMAC_CTL_RX_EN | EMAC_CTL_RESET);
writel(reg_val, db->membase + EMAC_CTL_REG);
}
/* Stop the interface.
* The interface is stopped when it is brought.
*/
static int emac_stop(struct net_device *ndev)
{
struct emac_board_info *db = netdev_priv(ndev);
if (netif_msg_ifdown(db))
dev_dbg(db->dev, "shutting down %s\n", ndev->name);
netif_stop_queue(ndev);
netif_carrier_off(ndev);
phy_stop(db->phy_dev);
emac_mdio_remove(ndev);
emac_shutdown(ndev);
free_irq(ndev->irq, ndev);
return 0;
}
static const struct net_device_ops emac_netdev_ops = {
.ndo_open = emac_open,
.ndo_stop = emac_stop,
.ndo_start_xmit = emac_start_xmit,
.ndo_tx_timeout = emac_timeout,
.ndo_do_ioctl = emac_ioctl,
.ndo_change_mtu = eth_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = emac_set_mac_address,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = emac_poll_controller,
#endif
};
/* Search EMAC board, allocate space and register it
*/
static int emac_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct emac_board_info *db;
struct net_device *ndev;
int ret = 0;
const char *mac_addr;
ndev = alloc_etherdev(sizeof(struct emac_board_info));
if (!ndev) {
dev_err(&pdev->dev, "could not allocate device.\n");
return -ENOMEM;
}
SET_NETDEV_DEV(ndev, &pdev->dev);
db = netdev_priv(ndev);
memset(db, 0, sizeof(*db));
db->dev = &pdev->dev;
db->ndev = ndev;
db->pdev = pdev;
spin_lock_init(&db->lock);
db->membase = of_iomap(np, 0);
if (!db->membase) {
dev_err(&pdev->dev, "failed to remap registers\n");
ret = -ENOMEM;
goto out;
}
/* fill in parameters for net-dev structure */
ndev->base_addr = (unsigned long)db->membase;
ndev->irq = irq_of_parse_and_map(np, 0);
if (ndev->irq == -ENXIO) {
netdev_err(ndev, "No irq resource\n");
ret = ndev->irq;
goto out;
}
db->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(db->clk))
goto out;
clk_prepare_enable(db->clk);
db->phy_node = of_parse_phandle(np, "phy", 0);
if (!db->phy_node) {
dev_err(&pdev->dev, "no associated PHY\n");
ret = -ENODEV;
goto out;
}
/* Read MAC-address from DT */
mac_addr = of_get_mac_address(np);
if (mac_addr)
memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
/* Check if the MAC address is valid, if not get a random one */
if (!is_valid_ether_addr(ndev->dev_addr)) {
eth_hw_addr_random(ndev);
dev_warn(&pdev->dev, "using random MAC address %pM\n",
ndev->dev_addr);
}
db->emacrx_completed_flag = 1;
emac_powerup(ndev);
emac_reset(db);
ether_setup(ndev);
ndev->netdev_ops = &emac_netdev_ops;
ndev->watchdog_timeo = msecs_to_jiffies(watchdog);
ndev->ethtool_ops = &emac_ethtool_ops;
platform_set_drvdata(pdev, ndev);
/* Carrier starts down, phylib will bring it up */
netif_carrier_off(ndev);
ret = register_netdev(ndev);
if (ret) {
dev_err(&pdev->dev, "Registering netdev failed!\n");
ret = -ENODEV;
goto out;
}
dev_info(&pdev->dev, "%s: at %p, IRQ %d MAC: %pM\n",
ndev->name, db->membase, ndev->irq, ndev->dev_addr);
return 0;
out:
dev_err(db->dev, "not found (%d).\n", ret);
free_netdev(ndev);
return ret;
}
static int emac_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
unregister_netdev(ndev);
free_netdev(ndev);
dev_dbg(&pdev->dev, "released and freed device\n");
return 0;
}
static int emac_suspend(struct platform_device *dev, pm_message_t state)
{
struct net_device *ndev = platform_get_drvdata(dev);
netif_carrier_off(ndev);
netif_device_detach(ndev);
emac_shutdown(ndev);
return 0;
}
static int emac_resume(struct platform_device *dev)
{
struct net_device *ndev = platform_get_drvdata(dev);
struct emac_board_info *db = netdev_priv(ndev);
emac_reset(db);
emac_init_device(ndev);
netif_device_attach(ndev);
return 0;
}
static const struct of_device_id emac_of_match[] = {
{.compatible = "allwinner,sun4i-a10-emac",},
/* Deprecated */
{.compatible = "allwinner,sun4i-emac",},
{},
};
MODULE_DEVICE_TABLE(of, emac_of_match);
static struct platform_driver emac_driver = {
.driver = {
.name = "sun4i-emac",
.of_match_table = emac_of_match,
},
.probe = emac_probe,
.remove = emac_remove,
.suspend = emac_suspend,
.resume = emac_resume,
};
module_platform_driver(emac_driver);
MODULE_AUTHOR("Stefan Roese <sr@denx.de>");
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A10 emac network driver");
MODULE_LICENSE("GPL");