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linux/drivers/net/arm/ep93xx_eth.c
Stephen Hemminger bea3348eef [NET]: Make NAPI polling independent of struct net_device objects. 
Several devices have multiple independant RX queues per net
device, and some have a single interrupt doorbell for several
queues.

In either case, it's easier to support layouts like that if the
structure representing the poll is independant from the net
device itself.

The signature of the ->poll() call back goes from:

	int foo_poll(struct net_device *dev, int *budget)

to

	int foo_poll(struct napi_struct *napi, int budget)

The caller is returned the number of RX packets processed (or
the number of "NAPI credits" consumed if you want to get
abstract).  The callee no longer messes around bumping
dev->quota, *budget, etc. because that is all handled in the
caller upon return.

The napi_struct is to be embedded in the device driver private data
structures.

Furthermore, it is the driver's responsibility to disable all NAPI
instances in it's ->stop() device close handler.  Since the
napi_struct is privatized into the driver's private data structures,
only the driver knows how to get at all of the napi_struct instances
it may have per-device.

With lots of help and suggestions from Rusty Russell, Roland Dreier,
Michael Chan, Jeff Garzik, and Jamal Hadi Salim.

Bug fixes from Thomas Graf, Roland Dreier, Peter Zijlstra,
Joseph Fannin, Scott Wood, Hans J. Koch, and Michael Chan.

[ Ported to current tree and all drivers converted.  Integrated
  Stephen's follow-on kerneldoc additions, and restored poll_list
  handling to the old style to fix mutual exclusion issues.  -DaveM ]

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10 16:47:45 -07:00

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/*
* EP93xx ethernet network device driver
* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
* Dedicated to Marija Kulikova.
*
* 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.
*/
#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/init.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <asm/arch/ep93xx-regs.h>
#include <asm/arch/platform.h>
#include <asm/io.h>
#define DRV_MODULE_NAME "ep93xx-eth"
#define DRV_MODULE_VERSION "0.1"
#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 *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 net_device_stats stats;
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);
static struct net_device_stats *ep93xx_get_stats(struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
return &(ep->stats);
}
static int ep93xx_rx(struct net_device *dev, int processed, int budget)
{
struct ep93xx_priv *ep = netdev_priv(dev);
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))
printk(KERN_CRIT "ep93xx_rx: not end-of-frame "
" %.8x %.8x\n", rstat0, rstat1);
if (!(rstat0 & RSTAT0_EOB))
printk(KERN_CRIT "ep93xx_rx: not end-of-buffer "
" %.8x %.8x\n", rstat0, rstat1);
if ((rstat1 & RSTAT1_BUFFER_INDEX) >> 16 != entry)
printk(KERN_CRIT "ep93xx_rx: entry mismatch "
" %.8x %.8x\n", rstat0, rstat1);
if (!(rstat0 & RSTAT0_RWE)) {
ep->stats.rx_errors++;
if (rstat0 & RSTAT0_OE)
ep->stats.rx_fifo_errors++;
if (rstat0 & RSTAT0_FE)
ep->stats.rx_frame_errors++;
if (rstat0 & (RSTAT0_RUNT | RSTAT0_EDATA))
ep->stats.rx_length_errors++;
if (rstat0 & RSTAT0_CRCE)
ep->stats.rx_crc_errors++;
goto err;
}
length = rstat1 & RSTAT1_FRAME_LENGTH;
if (length > MAX_PKT_SIZE) {
printk(KERN_NOTICE "ep93xx_rx: invalid length "
" %.8x %.8x\n", rstat0, rstat1);
goto err;
}
/* Strip FCS. */
if (rstat0 & RSTAT0_CRCI)
length -= 4;
skb = dev_alloc_skb(length + 2);
if (likely(skb != NULL)) {
skb_reserve(skb, 2);
dma_sync_single(NULL, ep->descs->rdesc[entry].buf_addr,
length, DMA_FROM_DEVICE);
skb_copy_to_linear_data(skb, ep->rx_buf[entry], length);
skb_put(skb, length);
skb->protocol = eth_type_trans(skb, dev);
dev->last_rx = jiffies;
netif_receive_skb(skb);
ep->stats.rx_packets++;
ep->stats.rx_bytes += length;
} else {
ep->stats.rx_dropped++;
}
err:
ep->rx_pointer = (entry + 1) & (RX_QUEUE_ENTRIES - 1);
processed++;
}
if (processed) {
wrw(ep, REG_RXDENQ, processed);
wrw(ep, REG_RXSTSENQ, processed);
}
return processed;
}
static int ep93xx_have_more_rx(struct ep93xx_priv *ep)
{
struct ep93xx_rstat *rstat = ep->descs->rstat + ep->rx_pointer;
return !!((rstat->rstat0 & RSTAT0_RFP) && (rstat->rstat1 & RSTAT1_RFP));
}
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 = 0;
poll_some_more:
rx = ep93xx_rx(dev, rx, budget);
if (rx < budget) {
int more = 0;
spin_lock_irq(&ep->rx_lock);
__netif_rx_complete(dev, napi);
wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
if (ep93xx_have_more_rx(ep)) {
wrl(ep, REG_INTEN, REG_INTEN_TX);
wrl(ep, REG_INTSTSP, REG_INTSTS_RX);
more = 1;
}
spin_unlock_irq(&ep->rx_lock);
if (more && netif_rx_reschedule(dev, napi))
goto poll_some_more;
}
return rx;
}
static int ep93xx_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ep93xx_priv *ep = netdev_priv(dev);
int entry;
if (unlikely(skb->len > MAX_PKT_SIZE)) {
ep->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);
ep->descs->tdesc[entry].tdesc1 =
TDESC1_EOF | (entry << 16) | (skb->len & 0xfff);
skb_copy_and_csum_dev(skb, ep->tx_buf[entry]);
dma_sync_single(NULL, ep->descs->tdesc[entry].buf_addr,
skb->len, DMA_TO_DEVICE);
dev_kfree_skb(skb);
dev->trans_start = jiffies;
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)
printk(KERN_CRIT "ep93xx_tx_complete: frame aborted "
" %.8x\n", tstat0);
if ((tstat0 & TSTAT0_BUFFER_INDEX) != entry)
printk(KERN_CRIT "ep93xx_tx_complete: entry mismatch "
" %.8x\n", tstat0);
if (tstat0 & TSTAT0_TXWE) {
int length = ep->descs->tdesc[entry].tdesc1 & 0xfff;
ep->stats.tx_packets++;
ep->stats.tx_bytes += length;
} else {
ep->stats.tx_errors++;
}
if (tstat0 & TSTAT0_OW)
ep->stats.tx_window_errors++;
if (tstat0 & TSTAT0_TXU)
ep->stats.tx_fifo_errors++;
ep->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(__netif_rx_schedule_prep(dev, &ep->napi))) {
wrl(ep, REG_INTEN, REG_INTEN_TX);
__netif_rx_schedule(dev, &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)
{
int i;
for (i = 0; i < RX_QUEUE_ENTRIES; i += 2) {
dma_addr_t d;
d = ep->descs->rdesc[i].buf_addr;
if (d)
dma_unmap_single(NULL, d, PAGE_SIZE, DMA_FROM_DEVICE);
if (ep->rx_buf[i] != NULL)
free_page((unsigned long)ep->rx_buf[i]);
}
for (i = 0; i < TX_QUEUE_ENTRIES; i += 2) {
dma_addr_t d;
d = ep->descs->tdesc[i].buf_addr;
if (d)
dma_unmap_single(NULL, d, PAGE_SIZE, DMA_TO_DEVICE);
if (ep->tx_buf[i] != NULL)
free_page((unsigned long)ep->tx_buf[i]);
}
dma_free_coherent(NULL, sizeof(struct ep93xx_descs), ep->descs,
ep->descs_dma_addr);
}
/*
* The hardware enforces a sub-2K maximum packet size, so we put
* two buffers on every hardware page.
*/
static int ep93xx_alloc_buffers(struct ep93xx_priv *ep)
{
int i;
ep->descs = dma_alloc_coherent(NULL, sizeof(struct ep93xx_descs),
&ep->descs_dma_addr, GFP_KERNEL | GFP_DMA);
if (ep->descs == NULL)
return 1;
for (i = 0; i < RX_QUEUE_ENTRIES; i += 2) {
void *page;
dma_addr_t d;
page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
if (page == NULL)
goto err;
d = dma_map_single(NULL, page, PAGE_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(d)) {
free_page((unsigned long)page);
goto err;
}
ep->rx_buf[i] = page;
ep->descs->rdesc[i].buf_addr = d;
ep->descs->rdesc[i].rdesc1 = (i << 16) | PKT_BUF_SIZE;
ep->rx_buf[i + 1] = page + PKT_BUF_SIZE;
ep->descs->rdesc[i + 1].buf_addr = d + PKT_BUF_SIZE;
ep->descs->rdesc[i + 1].rdesc1 = ((i + 1) << 16) | PKT_BUF_SIZE;
}
for (i = 0; i < TX_QUEUE_ENTRIES; i += 2) {
void *page;
dma_addr_t d;
page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
if (page == NULL)
goto err;
d = dma_map_single(NULL, page, PAGE_SIZE, DMA_TO_DEVICE);
if (dma_mapping_error(d)) {
free_page((unsigned long)page);
goto err;
}
ep->tx_buf[i] = page;
ep->descs->tdesc[i].buf_addr = d;
ep->tx_buf[i + 1] = page + PKT_BUF_SIZE;
ep->descs->tdesc[i + 1].buf_addr = d + PKT_BUF_SIZE;
}
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) {
printk(KERN_CRIT DRV_MODULE_NAME ": hw failed to reset\n");
return 1;
}
wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9));
/* Does the PHY support preamble suppress? */
if ((ep93xx_mdio_read(dev, ep->mii.phy_id, MII_BMSR) & 0x0040) != 0)
wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9) | (1 << 8));
/* Receive descriptor ring. */
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));
/* Receive status ring. */
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));
/* Transmit descriptor ring. */
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));
/* Transmit status ring. */
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) {
printk(KERN_CRIT DRV_MODULE_NAME ": 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)
printk(KERN_CRIT DRV_MODULE_NAME ": 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;
if (is_zero_ether_addr(dev->dev_addr)) {
random_ether_addr(dev->dev_addr);
printk(KERN_INFO "%s: generated random MAC address "
"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", dev->name,
dev->dev_addr[0], dev->dev_addr[1],
dev->dev_addr[2], dev->dev_addr[3],
dev->dev_addr[4], dev->dev_addr[5]);
}
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 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) {
printk(KERN_INFO DRV_MODULE_NAME ": 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)
printk(KERN_INFO DRV_MODULE_NAME ": mdio write timed out\n");
}
static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
strcpy(info->driver, DRV_MODULE_NAME);
strcpy(info->version, DRV_MODULE_VERSION);
}
static int ep93xx_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct ep93xx_priv *ep = netdev_priv(dev);
return mii_ethtool_gset(&ep->mii, cmd);
}
static int ep93xx_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct ep93xx_priv *ep = netdev_priv(dev);
return mii_ethtool_sset(&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 struct ethtool_ops ep93xx_ethtool_ops = {
.get_drvinfo = ep93xx_get_drvinfo,
.get_settings = ep93xx_get_settings,
.set_settings = ep93xx_set_settings,
.nway_reset = ep93xx_nway_reset,
.get_link = ep93xx_get_link,
};
struct net_device *ep93xx_dev_alloc(struct ep93xx_eth_data *data)
{
struct net_device *dev;
dev = alloc_etherdev(sizeof(struct ep93xx_priv));
if (dev == NULL)
return NULL;
memcpy(dev->dev_addr, data->dev_addr, ETH_ALEN);
dev->get_stats = ep93xx_get_stats;
dev->ethtool_ops = &ep93xx_ethtool_ops;
dev->hard_start_xmit = ep93xx_xmit;
dev->open = ep93xx_open;
dev->stop = ep93xx_close;
dev->do_ioctl = ep93xx_ioctl;
dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
return dev;
}
static int ep93xx_eth_remove(struct platform_device *pdev)
{
struct net_device *dev;
struct ep93xx_priv *ep;
dev = platform_get_drvdata(pdev);
if (dev == NULL)
return 0;
platform_set_drvdata(pdev, NULL);
ep = netdev_priv(dev);
/* @@@ Force down. */
unregister_netdev(dev);
ep93xx_free_buffers(ep);
if (ep->base_addr != NULL)
iounmap(ep->base_addr);
if (ep->res != NULL) {
release_resource(ep->res);
kfree(ep->res);
}
free_netdev(dev);
return 0;
}
static int ep93xx_eth_probe(struct platform_device *pdev)
{
struct ep93xx_eth_data *data;
struct net_device *dev;
struct ep93xx_priv *ep;
int err;
if (pdev == NULL)
return -ENODEV;
data = pdev->dev.platform_data;
dev = ep93xx_dev_alloc(data);
if (dev == NULL) {
err = -ENOMEM;
goto err_out;
}
ep = netdev_priv(dev);
ep->dev = dev;
netif_napi_add(dev, &ep->napi, ep93xx_poll, 64);
platform_set_drvdata(pdev, dev);
ep->res = request_mem_region(pdev->resource[0].start,
pdev->resource[0].end - pdev->resource[0].start + 1,
pdev->dev.bus_id);
if (ep->res == NULL) {
dev_err(&pdev->dev, "Could not reserve memory region\n");
err = -ENOMEM;
goto err_out;
}
ep->base_addr = ioremap(pdev->resource[0].start,
pdev->resource[0].end - pdev->resource[0].start);
if (ep->base_addr == NULL) {
dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
err = -EIO;
goto err_out;
}
ep->irq = pdev->resource[1].start;
ep->mii.phy_id = data->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; /* Max HCLK 100 MHz, min MDIO clk 2.5 MHz. */
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, "
"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", dev->name,
ep->irq, data->dev_addr[0], data->dev_addr[1],
data->dev_addr[2], data->dev_addr[3],
data->dev_addr[4], data->dev_addr[5]);
return 0;
err_out:
ep93xx_eth_remove(pdev);
return err;
}
static struct platform_driver ep93xx_eth_driver = {
.probe = ep93xx_eth_probe,
.remove = ep93xx_eth_remove,
.driver = {
.name = "ep93xx-eth",
},
};
static int __init ep93xx_eth_init_module(void)
{
printk(KERN_INFO DRV_MODULE_NAME " version " DRV_MODULE_VERSION " loading\n");
return platform_driver_register(&ep93xx_eth_driver);
}
static void __exit ep93xx_eth_cleanup_module(void)
{
platform_driver_unregister(&ep93xx_eth_driver);
}
module_init(ep93xx_eth_init_module);
module_exit(ep93xx_eth_cleanup_module);
MODULE_LICENSE("GPL");
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