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alistair23-linux/drivers/net/7990.c
David S. Miller babcda74e9 drivers/net: Kill now superfluous ->last_rx stores. 
The generic packet receive code takes care of setting
netdev->last_rx when necessary, for the sake of the
bonding ARP monitor.

Drivers need not do it any more.

Some cases had to be skipped over because the drivers
were making use of the ->last_rx value themselves.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-03 21:11:17 -08:00

675 lines
22 KiB
C
Raw Blame History

/*
* 7990.c -- LANCE ethernet IC generic routines.
* This is an attempt to separate out the bits of various ethernet
* drivers that are common because they all use the AMD 7990 LANCE
* (Local Area Network Controller for Ethernet) chip.
*
* Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
*
* Most of this stuff was obtained by looking at other LANCE drivers,
* in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.
* NB: this was made easy by the fact that Jes Sorensen had cleaned up
* most of a2025 and sunlance with the aim of merging them, so the
* common code was pretty obvious.
*/
#include <linux/crc32.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/route.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <asm/irq.h>
/* Used for the temporal inet entries and routing */
#include <linux/socket.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/pgtable.h>
#ifdef CONFIG_HP300
#include <asm/blinken.h>
#endif
#include "7990.h"
#define WRITERAP(lp,x) out_be16(lp->base + LANCE_RAP, (x))
#define WRITERDP(lp,x) out_be16(lp->base + LANCE_RDP, (x))
#define READRDP(lp) in_be16(lp->base + LANCE_RDP)
#if defined(CONFIG_HPLANCE) || defined(CONFIG_HPLANCE_MODULE)
#include "hplance.h"
#undef WRITERAP
#undef WRITERDP
#undef READRDP
#if defined(CONFIG_MVME147_NET) || defined(CONFIG_MVME147_NET_MODULE)
/* Lossage Factor Nine, Mr Sulu. */
#define WRITERAP(lp,x) (lp->writerap(lp,x))
#define WRITERDP(lp,x) (lp->writerdp(lp,x))
#define READRDP(lp) (lp->readrdp(lp))
#else
/* These inlines can be used if only CONFIG_HPLANCE is defined */
static inline void WRITERAP(struct lance_private *lp, __u16 value)
{
do {
out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
}
static inline void WRITERDP(struct lance_private *lp, __u16 value)
{
do {
out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
}
static inline __u16 READRDP(struct lance_private *lp)
{
__u16 value;
do {
value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
return value;
}
#endif
#endif /* CONFIG_HPLANCE || CONFIG_HPLANCE_MODULE */
/* debugging output macros, various flavours */
/* #define TEST_HITS */
#ifdef UNDEF
#define PRINT_RINGS() \
do { \
int t; \
for (t=0; t < RX_RING_SIZE; t++) { \
printk("R%d: @(%02X %04X) len %04X, mblen %04X, bits %02X\n",\
t, ib->brx_ring[t].rmd1_hadr, ib->brx_ring[t].rmd0,\
ib->brx_ring[t].length,\
ib->brx_ring[t].mblength, ib->brx_ring[t].rmd1_bits);\
}\
for (t=0; t < TX_RING_SIZE; t++) { \
printk("T%d: @(%02X %04X) len %04X, misc %04X, bits %02X\n",\
t, ib->btx_ring[t].tmd1_hadr, ib->btx_ring[t].tmd0,\
ib->btx_ring[t].length,\
ib->btx_ring[t].misc, ib->btx_ring[t].tmd1_bits);\
}\
} while (0)
#else
#define PRINT_RINGS()
#endif
/* Load the CSR registers. The LANCE has to be STOPped when we do this! */
static void load_csrs (struct lance_private *lp)
{
volatile struct lance_init_block *aib = lp->lance_init_block;
int leptr;
leptr = LANCE_ADDR (aib);
WRITERAP(lp, LE_CSR1); /* load address of init block */
WRITERDP(lp, leptr & 0xFFFF);
WRITERAP(lp, LE_CSR2);
WRITERDP(lp, leptr >> 16);
WRITERAP(lp, LE_CSR3);
WRITERDP(lp, lp->busmaster_regval); /* set byteswap/ALEctrl/byte ctrl */
/* Point back to csr0 */
WRITERAP(lp, LE_CSR0);
}
/* #define to 0 or 1 appropriately */
#define DEBUG_IRING 0
/* Set up the Lance Rx and Tx rings and the init block */
static void lance_init_ring (struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_init_block *ib = lp->init_block;
volatile struct lance_init_block *aib; /* for LANCE_ADDR computations */
int leptr;
int i;
aib = lp->lance_init_block;
lp->rx_new = lp->tx_new = 0;
lp->rx_old = lp->tx_old = 0;
ib->mode = LE_MO_PROM; /* normal, enable Tx & Rx */
/* Copy the ethernet address to the lance init block
* Notice that we do a byteswap if we're big endian.
* [I think this is the right criterion; at least, sunlance,
* a2065 and atarilance do the byteswap and lance.c (PC) doesn't.
* However, the datasheet says that the BSWAP bit doesn't affect
* the init block, so surely it should be low byte first for
* everybody? Um.]
* We could define the ib->physaddr as three 16bit values and
* use (addr[1] << 8) | addr[0] & co, but this is more efficient.
*/
#ifdef __BIG_ENDIAN
ib->phys_addr [0] = dev->dev_addr [1];
ib->phys_addr [1] = dev->dev_addr [0];
ib->phys_addr [2] = dev->dev_addr [3];
ib->phys_addr [3] = dev->dev_addr [2];
ib->phys_addr [4] = dev->dev_addr [5];
ib->phys_addr [5] = dev->dev_addr [4];
#else
for (i=0; i<6; i++)
ib->phys_addr[i] = dev->dev_addr[i];
#endif
if (DEBUG_IRING)
printk ("TX rings:\n");
lp->tx_full = 0;
/* Setup the Tx ring entries */
for (i = 0; i < (1<<lp->lance_log_tx_bufs); i++) {
leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
ib->btx_ring [i].tmd0 = leptr;
ib->btx_ring [i].tmd1_hadr = leptr >> 16;
ib->btx_ring [i].tmd1_bits = 0;
ib->btx_ring [i].length = 0xf000; /* The ones required by tmd2 */
ib->btx_ring [i].misc = 0;
if (DEBUG_IRING)
printk ("%d: 0x%8.8x\n", i, leptr);
}
/* Setup the Rx ring entries */
if (DEBUG_IRING)
printk ("RX rings:\n");
for (i = 0; i < (1<<lp->lance_log_rx_bufs); i++) {
leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
ib->brx_ring [i].rmd0 = leptr;
ib->brx_ring [i].rmd1_hadr = leptr >> 16;
ib->brx_ring [i].rmd1_bits = LE_R1_OWN;
/* 0xf000 == bits that must be one (reserved, presumably) */
ib->brx_ring [i].length = -RX_BUFF_SIZE | 0xf000;
ib->brx_ring [i].mblength = 0;
if (DEBUG_IRING)
printk ("%d: 0x%8.8x\n", i, leptr);
}
/* Setup the initialization block */
/* Setup rx descriptor pointer */
leptr = LANCE_ADDR(&aib->brx_ring);
ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
ib->rx_ptr = leptr;
if (DEBUG_IRING)
printk ("RX ptr: %8.8x\n", leptr);
/* Setup tx descriptor pointer */
leptr = LANCE_ADDR(&aib->btx_ring);
ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
ib->tx_ptr = leptr;
if (DEBUG_IRING)
printk ("TX ptr: %8.8x\n", leptr);
/* Clear the multicast filter */
ib->filter [0] = 0;
ib->filter [1] = 0;
PRINT_RINGS();
}
/* LANCE must be STOPped before we do this, too... */
static int init_restart_lance (struct lance_private *lp)
{
int i;
WRITERAP(lp, LE_CSR0);
WRITERDP(lp, LE_C0_INIT);
/* Need a hook here for sunlance ledma stuff */
/* Wait for the lance to complete initialization */
for (i = 0; (i < 100) && !(READRDP(lp) & (LE_C0_ERR | LE_C0_IDON)); i++)
barrier();
if ((i == 100) || (READRDP(lp) & LE_C0_ERR)) {
printk ("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, READRDP(lp));
return -1;
}
/* Clear IDON by writing a "1", enable interrupts and start lance */
WRITERDP(lp, LE_C0_IDON);
WRITERDP(lp, LE_C0_INEA | LE_C0_STRT);
return 0;
}
static int lance_reset (struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
int status;
/* Stop the lance */
WRITERAP(lp, LE_CSR0);
WRITERDP(lp, LE_C0_STOP);
load_csrs (lp);
lance_init_ring (dev);
dev->trans_start = jiffies;
status = init_restart_lance (lp);
#ifdef DEBUG_DRIVER
printk ("Lance restart=%d\n", status);
#endif
return status;
}
static int lance_rx (struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_init_block *ib = lp->init_block;
volatile struct lance_rx_desc *rd;
unsigned char bits;
#ifdef TEST_HITS
int i;
#endif
#ifdef TEST_HITS
printk ("[");
for (i = 0; i < RX_RING_SIZE; i++) {
if (i == lp->rx_new)
printk ("%s",
ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "_" : "X");
else
printk ("%s",
ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "." : "1");
}
printk ("]");
#endif
#ifdef CONFIG_HP300
blinken_leds(0x40, 0);
#endif
WRITERDP(lp, LE_C0_RINT | LE_C0_INEA); /* ack Rx int, reenable ints */
for (rd = &ib->brx_ring [lp->rx_new]; /* For each Rx ring we own... */
!((bits = rd->rmd1_bits) & LE_R1_OWN);
rd = &ib->brx_ring [lp->rx_new]) {
/* We got an incomplete frame? */
if ((bits & LE_R1_POK) != LE_R1_POK) {
dev->stats.rx_over_errors++;
dev->stats.rx_errors++;
continue;
} else if (bits & LE_R1_ERR) {
/* Count only the end frame as a rx error,
* not the beginning
*/
if (bits & LE_R1_BUF) dev->stats.rx_fifo_errors++;
if (bits & LE_R1_CRC) dev->stats.rx_crc_errors++;
if (bits & LE_R1_OFL) dev->stats.rx_over_errors++;
if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
if (bits & LE_R1_EOP) dev->stats.rx_errors++;
} else {
int len = (rd->mblength & 0xfff) - 4;
struct sk_buff *skb = dev_alloc_skb (len+2);
if (!skb) {
printk ("%s: Memory squeeze, deferring packet.\n",
dev->name);
dev->stats.rx_dropped++;
rd->mblength = 0;
rd->rmd1_bits = LE_R1_OWN;
lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
return 0;
}
skb_reserve (skb, 2); /* 16 byte align */
skb_put (skb, len); /* make room */
skb_copy_to_linear_data(skb,
(unsigned char *)&(ib->rx_buf [lp->rx_new][0]),
len);
skb->protocol = eth_type_trans (skb, dev);
netif_rx (skb);
dev->stats.rx_packets++;
dev->stats.rx_bytes += len;
}
/* Return the packet to the pool */
rd->mblength = 0;
rd->rmd1_bits = LE_R1_OWN;
lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
}
return 0;
}
static int lance_tx (struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_init_block *ib = lp->init_block;
volatile struct lance_tx_desc *td;
int i, j;
int status;
#ifdef CONFIG_HP300
blinken_leds(0x80, 0);
#endif
/* csr0 is 2f3 */
WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
/* csr0 is 73 */
j = lp->tx_old;
for (i = j; i != lp->tx_new; i = j) {
td = &ib->btx_ring [i];
/* If we hit a packet not owned by us, stop */
if (td->tmd1_bits & LE_T1_OWN)
break;
if (td->tmd1_bits & LE_T1_ERR) {
status = td->misc;
dev->stats.tx_errors++;
if (status & LE_T3_RTY) dev->stats.tx_aborted_errors++;
if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;
if (status & LE_T3_CLOS) {
dev->stats.tx_carrier_errors++;
if (lp->auto_select) {
lp->tpe = 1 - lp->tpe;
printk("%s: Carrier Lost, trying %s\n",
dev->name, lp->tpe?"TPE":"AUI");
/* Stop the lance */
WRITERAP(lp, LE_CSR0);
WRITERDP(lp, LE_C0_STOP);
lance_init_ring (dev);
load_csrs (lp);
init_restart_lance (lp);
return 0;
}
}
/* buffer errors and underflows turn off the transmitter */
/* Restart the adapter */
if (status & (LE_T3_BUF|LE_T3_UFL)) {
dev->stats.tx_fifo_errors++;
printk ("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
dev->name);
/* Stop the lance */
WRITERAP(lp, LE_CSR0);
WRITERDP(lp, LE_C0_STOP);
lance_init_ring (dev);
load_csrs (lp);
init_restart_lance (lp);
return 0;
}
} else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
/*
* So we don't count the packet more than once.
*/
td->tmd1_bits &= ~(LE_T1_POK);
/* One collision before packet was sent. */
if (td->tmd1_bits & LE_T1_EONE)
dev->stats.collisions++;
/* More than one collision, be optimistic. */
if (td->tmd1_bits & LE_T1_EMORE)
dev->stats.collisions += 2;
dev->stats.tx_packets++;
}
j = (j + 1) & lp->tx_ring_mod_mask;
}
lp->tx_old = j;
WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
return 0;
}
static irqreturn_t
lance_interrupt (int irq, void *dev_id)
{
struct net_device *dev = (struct net_device *)dev_id;
struct lance_private *lp = netdev_priv(dev);
int csr0;
spin_lock (&lp->devlock);
WRITERAP(lp, LE_CSR0); /* LANCE Controller Status */
csr0 = READRDP(lp);
PRINT_RINGS();
if (!(csr0 & LE_C0_INTR)) { /* Check if any interrupt has */
spin_unlock (&lp->devlock);
return IRQ_NONE; /* been generated by the Lance. */
}
/* Acknowledge all the interrupt sources ASAP */
WRITERDP(lp, csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));
if ((csr0 & LE_C0_ERR)) {
/* Clear the error condition */
WRITERDP(lp, LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA);
}
if (csr0 & LE_C0_RINT)
lance_rx (dev);
if (csr0 & LE_C0_TINT)
lance_tx (dev);
/* Log misc errors. */
if (csr0 & LE_C0_BABL)
dev->stats.tx_errors++; /* Tx babble. */
if (csr0 & LE_C0_MISS)
dev->stats.rx_errors++; /* Missed a Rx frame. */
if (csr0 & LE_C0_MERR) {
printk("%s: Bus master arbitration failure, status %4.4x.\n",
dev->name, csr0);
/* Restart the chip. */
WRITERDP(lp, LE_C0_STRT);
}
if (lp->tx_full && netif_queue_stopped(dev) && (TX_BUFFS_AVAIL >= 0)) {
lp->tx_full = 0;
netif_wake_queue (dev);
}
WRITERAP(lp, LE_CSR0);
WRITERDP(lp, LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);
spin_unlock (&lp->devlock);
return IRQ_HANDLED;
}
int lance_open (struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
int res;
/* Install the Interrupt handler. Or we could shunt this out to specific drivers? */
if (request_irq(lp->irq, lance_interrupt, IRQF_SHARED, lp->name, dev))
return -EAGAIN;
res = lance_reset(dev);
spin_lock_init(&lp->devlock);
netif_start_queue (dev);
return res;
}
EXPORT_SYMBOL_GPL(lance_open);
int lance_close (struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
netif_stop_queue (dev);
/* Stop the LANCE */
WRITERAP(lp, LE_CSR0);
WRITERDP(lp, LE_C0_STOP);
free_irq(lp->irq, dev);
return 0;
}
EXPORT_SYMBOL_GPL(lance_close);
void lance_tx_timeout(struct net_device *dev)
{
printk("lance_tx_timeout\n");
lance_reset(dev);
dev->trans_start = jiffies;
netif_wake_queue (dev);
}
EXPORT_SYMBOL_GPL(lance_tx_timeout);
int lance_start_xmit (struct sk_buff *skb, struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_init_block *ib = lp->init_block;
int entry, skblen, len;
static int outs;
unsigned long flags;
if (!TX_BUFFS_AVAIL)
return -1;
netif_stop_queue (dev);
skblen = skb->len;
#ifdef DEBUG_DRIVER
/* dump the packet */
{
int i;
for (i = 0; i < 64; i++) {
if ((i % 16) == 0)
printk ("\n");
printk ("%2.2x ", skb->data [i]);
}
}
#endif
len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
entry = lp->tx_new & lp->tx_ring_mod_mask;
ib->btx_ring [entry].length = (-len) | 0xf000;
ib->btx_ring [entry].misc = 0;
if (skb->len < ETH_ZLEN)
memset((void *)&ib->tx_buf[entry][0], 0, ETH_ZLEN);
skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);
/* Now, give the packet to the lance */
ib->btx_ring [entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
outs++;
/* Kick the lance: transmit now */
WRITERDP(lp, LE_C0_INEA | LE_C0_TDMD);
dev->trans_start = jiffies;
dev_kfree_skb (skb);
spin_lock_irqsave (&lp->devlock, flags);
if (TX_BUFFS_AVAIL)
netif_start_queue (dev);
else
lp->tx_full = 1;
spin_unlock_irqrestore (&lp->devlock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(lance_start_xmit);
/* taken from the depca driver via a2065.c */
static void lance_load_multicast (struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_init_block *ib = lp->init_block;
volatile u16 *mcast_table = (u16 *)&ib->filter;
struct dev_mc_list *dmi=dev->mc_list;
char *addrs;
int i;
u32 crc;
/* set all multicast bits */
if (dev->flags & IFF_ALLMULTI){
ib->filter [0] = 0xffffffff;
ib->filter [1] = 0xffffffff;
return;
}
/* clear the multicast filter */
ib->filter [0] = 0;
ib->filter [1] = 0;
/* Add addresses */
for (i = 0; i < dev->mc_count; i++){
addrs = dmi->dmi_addr;
dmi = dmi->next;
/* multicast address? */
if (!(*addrs & 1))
continue;
crc = ether_crc_le(6, addrs);
crc = crc >> 26;
mcast_table [crc >> 4] |= 1 << (crc & 0xf);
}
return;
}
void lance_set_multicast (struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
volatile struct lance_init_block *ib = lp->init_block;
int stopped;
stopped = netif_queue_stopped(dev);
if (!stopped)
netif_stop_queue (dev);
while (lp->tx_old != lp->tx_new)
schedule();
WRITERAP(lp, LE_CSR0);
WRITERDP(lp, LE_C0_STOP);
lance_init_ring (dev);
if (dev->flags & IFF_PROMISC) {
ib->mode |= LE_MO_PROM;
} else {
ib->mode &= ~LE_MO_PROM;
lance_load_multicast (dev);
}
load_csrs (lp);
init_restart_lance (lp);
if (!stopped)
netif_start_queue (dev);
}
EXPORT_SYMBOL_GPL(lance_set_multicast);
#ifdef CONFIG_NET_POLL_CONTROLLER
void lance_poll(struct net_device *dev)
{
struct lance_private *lp = netdev_priv(dev);
spin_lock (&lp->devlock);
WRITERAP(lp, LE_CSR0);
WRITERDP(lp, LE_C0_STRT);
spin_unlock (&lp->devlock);
lance_interrupt(dev->irq, dev);
}
#endif
MODULE_LICENSE("GPL");
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