#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/mii.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/interrupt.h>
#include <linux/moduleparam.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#define DRV_MODULE_NAME "ep93xx-eth"
#define RX_QUEUE_ENTRIES 64
#define TX_QUEUE_ENTRIES 8
#define MAX_PKT_SIZE 2044
#define PKT_BUF_SIZE 2048
#define REG_RXCTL 0x0000
#define REG_RXCTL_DEFAULT 0x00073800
#define REG_TXCTL 0x0004
#define REG_TXCTL_ENABLE 0x00000001
#define REG_MIICMD 0x0010
#define REG_MIICMD_READ 0x00008000
#define REG_MIICMD_WRITE 0x00004000
#define REG_MIIDATA 0x0014
#define REG_MIISTS 0x0018
#define REG_MIISTS_BUSY 0x00000001
#define REG_SELFCTL 0x0020
#define REG_SELFCTL_RESET 0x00000001
#define REG_INTEN 0x0024
#define REG_INTEN_TX 0x00000008
#define REG_INTEN_RX 0x00000007
#define REG_INTSTSP 0x0028
#define REG_INTSTS_TX 0x00000008
#define REG_INTSTS_RX 0x00000004
#define REG_INTSTSC 0x002c
#define REG_AFP 0x004c
#define REG_INDAD0 0x0050
#define REG_INDAD1 0x0051
#define REG_INDAD2 0x0052
#define REG_INDAD3 0x0053
#define REG_INDAD4 0x0054
#define REG_INDAD5 0x0055
#define REG_GIINTMSK 0x0064
#define REG_GIINTMSK_ENABLE 0x00008000
#define REG_BMCTL 0x0080
#define REG_BMCTL_ENABLE_TX 0x00000100
#define REG_BMCTL_ENABLE_RX 0x00000001
#define REG_BMSTS 0x0084
#define REG_BMSTS_RX_ACTIVE 0x00000008
#define REG_RXDQBADD 0x0090
#define REG_RXDQBLEN 0x0094
#define REG_RXDCURADD 0x0098
#define REG_RXDENQ 0x009c
#define REG_RXSTSQBADD 0x00a0
#define REG_RXSTSQBLEN 0x00a4
#define REG_RXSTSQCURADD 0x00a8
#define REG_RXSTSENQ 0x00ac
#define REG_TXDQBADD 0x00b0
#define REG_TXDQBLEN 0x00b4
#define REG_TXDQCURADD 0x00b8
#define REG_TXDENQ 0x00bc
#define REG_TXSTSQBADD 0x00c0
#define REG_TXSTSQBLEN 0x00c4
#define REG_TXSTSQCURADD 0x00c8
#define REG_MAXFRMLEN 0x00e8
struct ep93xx_rdesc
{
u32 buf_addr;
u32 rdesc1;
};
#define RDESC1_NSOF 0x80000000
#define RDESC1_BUFFER_INDEX 0x7fff0000
#define RDESC1_BUFFER_LENGTH 0x0000ffff
struct ep93xx_rstat
{
u32 rstat0;
u32 rstat1;
};
#define RSTAT0_RFP 0x80000000
#define RSTAT0_RWE 0x40000000
#define RSTAT0_EOF 0x20000000
#define RSTAT0_EOB 0x10000000
#define RSTAT0_AM 0x00c00000
#define RSTAT0_RX_ERR 0x00200000
#define RSTAT0_OE 0x00100000
#define RSTAT0_FE 0x00080000
#define RSTAT0_RUNT 0x00040000
#define RSTAT0_EDATA 0x00020000
#define RSTAT0_CRCE 0x00010000
#define RSTAT0_CRCI 0x00008000
#define RSTAT0_HTI 0x00003f00
#define RSTAT1_RFP 0x80000000
#define RSTAT1_BUFFER_INDEX 0x7fff0000
#define RSTAT1_FRAME_LENGTH 0x0000ffff
struct ep93xx_tdesc
{
u32 buf_addr;
u32 tdesc1;
};
#define TDESC1_EOF 0x80000000
#define TDESC1_BUFFER_INDEX 0x7fff0000
#define TDESC1_BUFFER_ABORT 0x00008000
#define TDESC1_BUFFER_LENGTH 0x00000fff
struct ep93xx_tstat
{
u32 tstat0;
};
#define TSTAT0_TXFP 0x80000000
#define TSTAT0_TXWE 0x40000000
#define TSTAT0_FA 0x20000000
#define TSTAT0_LCRS 0x10000000
#define TSTAT0_OW 0x04000000
#define TSTAT0_TXU 0x02000000
#define TSTAT0_ECOLL 0x01000000
#define TSTAT0_NCOLL 0x001f0000
#define TSTAT0_BUFFER_INDEX 0x00007fff
struct ep93xx_descs
{
struct ep93xx_rdesc rdesc[RX_QUEUE_ENTRIES];
struct ep93xx_tdesc tdesc[TX_QUEUE_ENTRIES];
struct ep93xx_rstat rstat[RX_QUEUE_ENTRIES];
struct ep93xx_tstat tstat[TX_QUEUE_ENTRIES];
};
struct ep93xx_priv
{
struct resource *res;
void __iomem *base_addr;
int irq;
struct ep93xx_descs *descs;
dma_addr_t descs_dma_addr;
void *rx_buf[RX_QUEUE_ENTRIES];
void *tx_buf[TX_QUEUE_ENTRIES];
spinlock_t rx_lock;
unsigned int rx_pointer;
unsigned int tx_clean_pointer;
unsigned int tx_pointer;
spinlock_t tx_pending_lock;
unsigned int tx_pending;
struct net_device *dev;
struct napi_struct napi;
struct mii_if_info mii;
u8 mdc_divisor;
};
#define rdb(ep, off) __raw_readb((ep)->base_addr + (off))
#define rdw(ep, off) __raw_readw((ep)->base_addr + (off))
#define rdl(ep, off) __raw_readl((ep)->base_addr + (off))
#define wrb(ep, off, val) __raw_writeb((val), (ep)->base_addr + (off))
#define wrw(ep, off, val) __raw_writew((val), (ep)->base_addr + (off))
#define wrl(ep, off, val) __raw_writel((val), (ep)->base_addr + (off))
static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg)
{
struct ep93xx_priv *ep = netdev_priv(dev);
int data;
int i;
wrl(ep, REG_MIICMD, REG_MIICMD_READ | (phy_id << 5) | reg);
for (i = 0; i < 10; i++) {
if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
break;
msleep(1);
}
if (i == 10) {
pr_info("mdio read timed out\n");
data = 0xffff;
} else {
data = rdl(ep, REG_MIIDATA);
}
return data;
}
static void ep93xx_mdio_write(struct net_device *dev, int phy_id, int reg, int data)
{
struct ep93xx_priv *ep = netdev_priv(dev);
int i;
wrl(ep, REG_MIIDATA, data);
wrl(ep, REG_MIICMD, REG_MIICMD_WRITE | (phy_id << 5) | reg);
for (i = 0; i < 10; i++) {
if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
break;
msleep(1);
}
if (i == 10)
pr_info("mdio write timed out\n");
}
static int ep93xx_rx(struct net_device *dev, int budget)
{
struct ep93xx_priv *ep = netdev_priv(dev);
int processed = 0;
while (processed < budget) {
int entry;
struct ep93xx_rstat *rstat;
u32 rstat0;
u32 rstat1;
int length;
struct sk_buff *skb;
entry = ep->rx_pointer;
rstat = ep->descs->rstat + entry;
rstat0 = rstat->rstat0;
rstat1 = rstat->rstat1;
if (!(rstat0 & RSTAT0_RFP) || !(rstat1 & RSTAT1_RFP))
break;
rstat->rstat0 = 0;
rstat->rstat1 = 0;
if (!(rstat0 & RSTAT0_EOF))
pr_crit("not end-of-frame %.8x %.8x\n", rstat0, rstat1);
if (!(rstat0 & RSTAT0_EOB))
pr_crit("not end-of-buffer %.8x %.8x\n", rstat0, rstat1);
if ((rstat1 & RSTAT1_BUFFER_INDEX) >> 16 != entry)
pr_crit("entry mismatch %.8x %.8x\n", rstat0, rstat1);
if (!(rstat0 & RSTAT0_RWE)) {
dev->stats.rx_errors++;
if (rstat0 & RSTAT0_OE)
dev->stats.rx_fifo_errors++;
if (rstat0 & RSTAT0_FE)
dev->stats.rx_frame_errors++;
if (rstat0 & (RSTAT0_RUNT | RSTAT0_EDATA))
dev->stats.rx_length_errors++;
if (rstat0 & RSTAT0_CRCE)
dev->stats.rx_crc_errors++;
goto err;
}
length = rstat1 & RSTAT1_FRAME_LENGTH;
if (length > MAX_PKT_SIZE) {
pr_notice("invalid length %.8x %.8x\n", rstat0, rstat1);
goto err;
}
if (rstat0 & RSTAT0_CRCI)
length -= 4;
skb = netdev_alloc_skb(dev, length + 2);
if (likely(skb != NULL)) {
struct ep93xx_rdesc *rxd = &ep->descs->rdesc[entry];
skb_reserve(skb, 2);
dma_sync_single_for_cpu(dev->dev.parent, rxd->buf_addr,
length, DMA_FROM_DEVICE);
skb_copy_to_linear_data(skb, ep->rx_buf[entry], length);
dma_sync_single_for_device(dev->dev.parent,
rxd->buf_addr, length,
DMA_FROM_DEVICE);
skb_put(skb, length);
skb->protocol = eth_type_trans(skb, dev);
napi_gro_receive(&ep->napi, skb);
dev->stats.rx_packets++;
dev->stats.rx_bytes += length;
} else {
dev->stats.rx_dropped++;
}
err:
ep->rx_pointer = (entry + 1) & (RX_QUEUE_ENTRIES - 1);
processed++;
}
return processed;
}
static int ep93xx_poll(struct napi_struct *napi, int budget)
{
struct ep93xx_priv *ep = container_of(napi, struct ep93xx_priv, napi);
struct net_device *dev = ep->dev;
int rx;
rx = ep93xx_rx(dev, budget);
if (rx < budget && napi_complete_done(napi, rx)) {
spin_lock_irq(&ep->rx_lock);
wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
spin_unlock_irq(&ep->rx_lock);
}
if (rx) {
wrw(ep, REG_RXDENQ, rx);
wrw(ep, REG_RXSTSENQ, rx);
}
return rx;
}
static netdev_tx_t ep93xx_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
struct ep93xx_tdesc *txd;
int entry;
if (unlikely(skb->len > MAX_PKT_SIZE)) {
dev->stats.tx_dropped++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
entry = ep->tx_pointer;
ep->tx_pointer = (ep->tx_pointer + 1) & (TX_QUEUE_ENTRIES - 1);
txd = &ep->descs->tdesc[entry];
txd->tdesc1 = TDESC1_EOF | (entry << 16) | (skb->len & 0xfff);
dma_sync_single_for_cpu(dev->dev.parent, txd->buf_addr, skb->len,
DMA_TO_DEVICE);
skb_copy_and_csum_dev(skb, ep->tx_buf[entry]);
dma_sync_single_for_device(dev->dev.parent, txd->buf_addr, skb->len,
DMA_TO_DEVICE);
dev_kfree_skb(skb);
spin_lock_irq(&ep->tx_pending_lock);
ep->tx_pending++;
if (ep->tx_pending == TX_QUEUE_ENTRIES)
netif_stop_queue(dev);
spin_unlock_irq(&ep->tx_pending_lock);
wrl(ep, REG_TXDENQ, 1);
return NETDEV_TX_OK;
}
static void ep93xx_tx_complete(struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
int wake;
wake = 0;
spin_lock(&ep->tx_pending_lock);
while (1) {
int entry;
struct ep93xx_tstat *tstat;
u32 tstat0;
entry = ep->tx_clean_pointer;
tstat = ep->descs->tstat + entry;
tstat0 = tstat->tstat0;
if (!(tstat0 & TSTAT0_TXFP))
break;
tstat->tstat0 = 0;
if (tstat0 & TSTAT0_FA)
pr_crit("frame aborted %.8x\n", tstat0);
if ((tstat0 & TSTAT0_BUFFER_INDEX) != entry)
pr_crit("entry mismatch %.8x\n", tstat0);
if (tstat0 & TSTAT0_TXWE) {
int length = ep->descs->tdesc[entry].tdesc1 & 0xfff;
dev->stats.tx_packets++;
dev->stats.tx_bytes += length;
} else {
dev->stats.tx_errors++;
}
if (tstat0 & TSTAT0_OW)
dev->stats.tx_window_errors++;
if (tstat0 & TSTAT0_TXU)
dev->stats.tx_fifo_errors++;
dev->stats.collisions += (tstat0 >> 16) & 0x1f;
ep->tx_clean_pointer = (entry + 1) & (TX_QUEUE_ENTRIES - 1);
if (ep->tx_pending == TX_QUEUE_ENTRIES)
wake = 1;
ep->tx_pending--;
}
spin_unlock(&ep->tx_pending_lock);
if (wake)
netif_wake_queue(dev);
}
static irqreturn_t ep93xx_irq(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct ep93xx_priv *ep = netdev_priv(dev);
u32 status;
status = rdl(ep, REG_INTSTSC);
if (status == 0)
return IRQ_NONE;
if (status & REG_INTSTS_RX) {
spin_lock(&ep->rx_lock);
if (likely(napi_schedule_prep(&ep->napi))) {
wrl(ep, REG_INTEN, REG_INTEN_TX);
__napi_schedule(&ep->napi);
}
spin_unlock(&ep->rx_lock);
}
if (status & REG_INTSTS_TX)
ep93xx_tx_complete(dev);
return IRQ_HANDLED;
}
static void ep93xx_free_buffers(struct ep93xx_priv *ep)
{
struct device *dev = ep->dev->dev.parent;
int i;
if (!ep->descs)
return;
for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
dma_addr_t d;
d = ep->descs->rdesc[i].buf_addr;
if (d)
dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_FROM_DEVICE);
kfree(ep->rx_buf[i]);
}
for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
dma_addr_t d;
d = ep->descs->tdesc[i].buf_addr;
if (d)
dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_TO_DEVICE);
kfree(ep->tx_buf[i]);
}
dma_free_coherent(dev, sizeof(struct ep93xx_descs), ep->descs,
ep->descs_dma_addr);
ep->descs = NULL;
}
static int ep93xx_alloc_buffers(struct ep93xx_priv *ep)
{
struct device *dev = ep->dev->dev.parent;
int i;
ep->descs = dma_alloc_coherent(dev, sizeof(struct ep93xx_descs),
&ep->descs_dma_addr, GFP_KERNEL);
if (ep->descs == NULL)
return 1;
for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
void *buf;
dma_addr_t d;
buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
if (buf == NULL)
goto err;
d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, d)) {
kfree(buf);
goto err;
}
ep->rx_buf[i] = buf;
ep->descs->rdesc[i].buf_addr = d;
ep->descs->rdesc[i].rdesc1 = (i << 16) | PKT_BUF_SIZE;
}
for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
void *buf;
dma_addr_t d;
buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
if (buf == NULL)
goto err;
d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_TO_DEVICE);
if (dma_mapping_error(dev, d)) {
kfree(buf);
goto err;
}
ep->tx_buf[i] = buf;
ep->descs->tdesc[i].buf_addr = d;
}
return 0;
err:
ep93xx_free_buffers(ep);
return 1;
}
static int ep93xx_start_hw(struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
unsigned long addr;
int i;
wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
for (i = 0; i < 10; i++) {
if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
break;
msleep(1);
}
if (i == 10) {
pr_crit("hw failed to reset\n");
return 1;
}
wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9));
if ((ep93xx_mdio_read(dev, ep->mii.phy_id, MII_BMSR) & 0x0040) != 0)
wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9) | (1 << 8));
addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rdesc);
wrl(ep, REG_RXDQBADD, addr);
wrl(ep, REG_RXDCURADD, addr);
wrw(ep, REG_RXDQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rdesc));
addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rstat);
wrl(ep, REG_RXSTSQBADD, addr);
wrl(ep, REG_RXSTSQCURADD, addr);
wrw(ep, REG_RXSTSQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rstat));
addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tdesc);
wrl(ep, REG_TXDQBADD, addr);
wrl(ep, REG_TXDQCURADD, addr);
wrw(ep, REG_TXDQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tdesc));
addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tstat);
wrl(ep, REG_TXSTSQBADD, addr);
wrl(ep, REG_TXSTSQCURADD, addr);
wrw(ep, REG_TXSTSQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tstat));
wrl(ep, REG_BMCTL, REG_BMCTL_ENABLE_TX | REG_BMCTL_ENABLE_RX);
wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
wrl(ep, REG_GIINTMSK, 0);
for (i = 0; i < 10; i++) {
if ((rdl(ep, REG_BMSTS) & REG_BMSTS_RX_ACTIVE) != 0)
break;
msleep(1);
}
if (i == 10) {
pr_crit("hw failed to start\n");
return 1;
}
wrl(ep, REG_RXDENQ, RX_QUEUE_ENTRIES);
wrl(ep, REG_RXSTSENQ, RX_QUEUE_ENTRIES);
wrb(ep, REG_INDAD0, dev->dev_addr[0]);
wrb(ep, REG_INDAD1, dev->dev_addr[1]);
wrb(ep, REG_INDAD2, dev->dev_addr[2]);
wrb(ep, REG_INDAD3, dev->dev_addr[3]);
wrb(ep, REG_INDAD4, dev->dev_addr[4]);
wrb(ep, REG_INDAD5, dev->dev_addr[5]);
wrl(ep, REG_AFP, 0);
wrl(ep, REG_MAXFRMLEN, (MAX_PKT_SIZE << 16) | MAX_PKT_SIZE);
wrl(ep, REG_RXCTL, REG_RXCTL_DEFAULT);
wrl(ep, REG_TXCTL, REG_TXCTL_ENABLE);
return 0;
}
static void ep93xx_stop_hw(struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
int i;
wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
for (i = 0; i < 10; i++) {
if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
break;
msleep(1);
}
if (i == 10)
pr_crit("hw failed to reset\n");
}
static int ep93xx_open(struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
int err;
if (ep93xx_alloc_buffers(ep))
return -ENOMEM;
napi_enable(&ep->napi);
if (ep93xx_start_hw(dev)) {
napi_disable(&ep->napi);
ep93xx_free_buffers(ep);
return -EIO;
}
spin_lock_init(&ep->rx_lock);
ep->rx_pointer = 0;
ep->tx_clean_pointer = 0;
ep->tx_pointer = 0;
spin_lock_init(&ep->tx_pending_lock);
ep->tx_pending = 0;
err = request_irq(ep->irq, ep93xx_irq, IRQF_SHARED, dev->name, dev);
if (err) {
napi_disable(&ep->napi);
ep93xx_stop_hw(dev);
ep93xx_free_buffers(ep);
return err;
}
wrl(ep, REG_GIINTMSK, REG_GIINTMSK_ENABLE);
netif_start_queue(dev);
return 0;
}
static int ep93xx_close(struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
napi_disable(&ep->napi);
netif_stop_queue(dev);
wrl(ep, REG_GIINTMSK, 0);
free_irq(ep->irq, dev);
ep93xx_stop_hw(dev);
ep93xx_free_buffers(ep);
return 0;
}
static int ep93xx_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct ep93xx_priv *ep = netdev_priv(dev);
struct mii_ioctl_data *data = if_mii(ifr);
return generic_mii_ioctl(&ep->mii, data, cmd, NULL);
}
static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
strscpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
}
static int ep93xx_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
{
struct ep93xx_priv *ep = netdev_priv(dev);
mii_ethtool_get_link_ksettings(&ep->mii, cmd);
return 0;
}
static int ep93xx_set_link_ksettings(struct net_device *dev,
const struct ethtool_link_ksettings *cmd)
{
struct ep93xx_priv *ep = netdev_priv(dev);
return mii_ethtool_set_link_ksettings(&ep->mii, cmd);
}
static int ep93xx_nway_reset(struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
return mii_nway_restart(&ep->mii);
}
static u32 ep93xx_get_link(struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
return mii_link_ok(&ep->mii);
}
static const struct ethtool_ops ep93xx_ethtool_ops = {
.get_drvinfo = ep93xx_get_drvinfo,
.nway_reset = ep93xx_nway_reset,
.get_link = ep93xx_get_link,
.get_link_ksettings = ep93xx_get_link_ksettings,
.set_link_ksettings = ep93xx_set_link_ksettings,
};
static const struct net_device_ops ep93xx_netdev_ops = {
.ndo_open = ep93xx_open,
.ndo_stop = ep93xx_close,
.ndo_start_xmit = ep93xx_xmit,
.ndo_eth_ioctl = ep93xx_ioctl,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
};
static void ep93xx_eth_remove(struct platform_device *pdev)
{
struct net_device *dev;
struct ep93xx_priv *ep;
struct resource *mem;
dev = platform_get_drvdata(pdev);
if (dev == NULL)
return;
ep = netdev_priv(dev);
unregister_netdev(dev);
ep93xx_free_buffers(ep);
if (ep->base_addr != NULL)
iounmap(ep->base_addr);
if (ep->res != NULL) {
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(mem->start, resource_size(mem));
}
free_netdev(dev);
}
static int ep93xx_eth_probe(struct platform_device *pdev)
{
struct net_device *dev;
struct ep93xx_priv *ep;
struct resource *mem;
void __iomem *base_addr;
struct device_node *np;
u8 addr[ETH_ALEN];
u32 phy_id;
int irq;
int err;
if (pdev == NULL)
return -ENODEV;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (!mem || irq < 0)
return -ENXIO;
base_addr = ioremap(mem->start, resource_size(mem));
if (!base_addr)
return dev_err_probe(&pdev->dev, -EIO, "Failed to ioremap ethernet registers\n");
np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
if (!np)
return dev_err_probe(&pdev->dev, -ENODEV, "Please provide \"phy-handle\"\n");
err = of_property_read_u32(np, "reg", &phy_id);
of_node_put(np);
if (err)
return dev_err_probe(&pdev->dev, -ENOENT, "Failed to locate \"phy_id\"\n");
dev = alloc_etherdev(sizeof(struct ep93xx_priv));
if (dev == NULL) {
err = -ENOMEM;
goto err_out;
}
memcpy_fromio(addr, base_addr + 0x50, ETH_ALEN);
eth_hw_addr_set(dev, addr);
dev->ethtool_ops = &ep93xx_ethtool_ops;
dev->netdev_ops = &ep93xx_netdev_ops;
dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
ep = netdev_priv(dev);
ep->dev = dev;
SET_NETDEV_DEV(dev, &pdev->dev);
netif_napi_add(dev, &ep->napi, ep93xx_poll);
platform_set_drvdata(pdev, dev);
ep->res = request_mem_region(mem->start, resource_size(mem),
dev_name(&pdev->dev));
if (ep->res == NULL) {
dev_err(&pdev->dev, "Could not reserve memory region\n");
err = -ENOMEM;
goto err_out;
}
ep->base_addr = base_addr;
ep->irq = irq;
ep->mii.phy_id = phy_id;
ep->mii.phy_id_mask = 0x1f;
ep->mii.reg_num_mask = 0x1f;
ep->mii.dev = dev;
ep->mii.mdio_read = ep93xx_mdio_read;
ep->mii.mdio_write = ep93xx_mdio_write;
ep->mdc_divisor = 40;
if (is_zero_ether_addr(dev->dev_addr))
eth_hw_addr_random(dev);
err = register_netdev(dev);
if (err) {
dev_err(&pdev->dev, "Failed to register netdev\n");
goto err_out;
}
printk(KERN_INFO "%s: ep93xx on-chip ethernet, IRQ %d, %pM\n",
dev->name, ep->irq, dev->dev_addr);
return 0;
err_out:
ep93xx_eth_remove(pdev);
return err;
}
static const struct of_device_id ep93xx_eth_of_ids[] = {
{ .compatible = "cirrus,ep9301-eth" },
{ }
};
MODULE_DEVICE_TABLE(of, ep93xx_eth_of_ids);
static struct platform_driver ep93xx_eth_driver = {
.probe = ep93xx_eth_probe,
.remove = ep93xx_eth_remove,
.driver = {
.name = "ep93xx-eth",
.of_match_table = ep93xx_eth_of_ids,
},
};
module_platform_driver(ep93xx_eth_driver);
MODULE_DESCRIPTION("Cirrus EP93xx Ethernet driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ep93xx-eth");
