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linux/drivers/net/sonic.c
Herbert Xu 5b057c6b1a [NET]: Avoid allocating skb in skb_pad 
First of all it is unnecessary to allocate a new skb in skb_pad since
the existing one is not shared.  More importantly, our hard_start_xmit
interface does not allow a new skb to be allocated since that breaks
requeueing.

This patch uses pskb_expand_head to expand the existing skb and linearize
it if needed.  Actually, someone should sift through every instance of
skb_pad on a non-linear skb as they do not fit the reasons why this was
originally created.

Incidentally, this fixes a minor bug when the skb is cloned (tcpdump,
TCP, etc.).  As it is skb_pad will simply write over a cloned skb.  Because
of the position of the write it is unlikely to cause problems but still
it's best if we don't do it.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-23 02:06:41 -07:00

770 lines
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/*
* sonic.c
*
* (C) 2005 Finn Thain
*
* Converted to DMA API, added zero-copy buffer handling, and
* (from the mac68k project) introduced dhd's support for 16-bit cards.
*
* (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
*
* This driver is based on work from Andreas Busse, but most of
* the code is rewritten.
*
* (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
*
* Core code included by system sonic drivers
*
* And... partially rewritten again by David Huggins-Daines in order
* to cope with screwed up Macintosh NICs that may or may not use
* 16-bit DMA.
*
* (C) 1999 David Huggins-Daines <dhd@debian.org>
*
*/
/*
* Sources: Olivetti M700-10 Risc Personal Computer hardware handbook,
* National Semiconductors data sheet for the DP83932B Sonic Ethernet
* controller, and the files "8390.c" and "skeleton.c" in this directory.
*
* Additional sources: Nat Semi data sheet for the DP83932C and Nat Semi
* Application Note AN-746, the files "lance.c" and "ibmlana.c". See also
* the NetBSD file "sys/arch/mac68k/dev/if_sn.c".
*/
/*
* Open/initialize the SONIC controller.
*
* This routine should set everything up anew at each open, even
* registers that "should" only need to be set once at boot, so that
* there is non-reboot way to recover if something goes wrong.
*/
static int sonic_open(struct net_device *dev)
{
struct sonic_local *lp = netdev_priv(dev);
int i;
if (sonic_debug > 2)
printk("sonic_open: initializing sonic driver.\n");
/*
* We don't need to deal with auto-irq stuff since we
* hardwire the sonic interrupt.
*/
/*
* XXX Horrible work around: We install sonic_interrupt as fast interrupt.
* This means that during execution of the handler interrupt are disabled
* covering another bug otherwise corrupting data. This doesn't mean
* this glue works ok under all situations.
*
* Note (dhd): this also appears to prevent lockups on the Macintrash
* when more than one Ethernet card is installed (knock on wood)
*
* Note (fthain): whether the above is still true is anyones guess. Certainly
* the buffer handling algorithms will not tolerate re-entrance without some
* mutual exclusion added. Anyway, the memcpy has now been eliminated from the
* rx code to make this a faster "fast interrupt".
*/
if (request_irq(dev->irq, &sonic_interrupt, SONIC_IRQ_FLAG, "sonic", dev)) {
printk(KERN_ERR "\n%s: unable to get IRQ %d .\n", dev->name, dev->irq);
return -EAGAIN;
}
for (i = 0; i < SONIC_NUM_RRS; i++) {
struct sk_buff *skb = dev_alloc_skb(SONIC_RBSIZE + 2);
if (skb == NULL) {
while(i > 0) { /* free any that were allocated successfully */
i--;
dev_kfree_skb(lp->rx_skb[i]);
lp->rx_skb[i] = NULL;
}
printk(KERN_ERR "%s: couldn't allocate receive buffers\n",
dev->name);
return -ENOMEM;
}
skb->dev = dev;
/* align IP header unless DMA requires otherwise */
if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
skb_reserve(skb, 2);
lp->rx_skb[i] = skb;
}
for (i = 0; i < SONIC_NUM_RRS; i++) {
dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE),
SONIC_RBSIZE, DMA_FROM_DEVICE);
if (!laddr) {
while(i > 0) { /* free any that were mapped successfully */
i--;
dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
lp->rx_laddr[i] = (dma_addr_t)0;
}
for (i = 0; i < SONIC_NUM_RRS; i++) {
dev_kfree_skb(lp->rx_skb[i]);
lp->rx_skb[i] = NULL;
}
printk(KERN_ERR "%s: couldn't map rx DMA buffers\n",
dev->name);
return -ENOMEM;
}
lp->rx_laddr[i] = laddr;
}
/*
* Initialize the SONIC
*/
sonic_init(dev);
netif_start_queue(dev);
if (sonic_debug > 2)
printk("sonic_open: Initialization done.\n");
return 0;
}
/*
* Close the SONIC device
*/
static int sonic_close(struct net_device *dev)
{
struct sonic_local *lp = netdev_priv(dev);
int i;
if (sonic_debug > 2)
printk("sonic_close\n");
netif_stop_queue(dev);
/*
* stop the SONIC, disable interrupts
*/
SONIC_WRITE(SONIC_IMR, 0);
SONIC_WRITE(SONIC_ISR, 0x7fff);
SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
/* unmap and free skbs that haven't been transmitted */
for (i = 0; i < SONIC_NUM_TDS; i++) {
if(lp->tx_laddr[i]) {
dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
lp->tx_laddr[i] = (dma_addr_t)0;
}
if(lp->tx_skb[i]) {
dev_kfree_skb(lp->tx_skb[i]);
lp->tx_skb[i] = NULL;
}
}
/* unmap and free the receive buffers */
for (i = 0; i < SONIC_NUM_RRS; i++) {
if(lp->rx_laddr[i]) {
dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
lp->rx_laddr[i] = (dma_addr_t)0;
}
if(lp->rx_skb[i]) {
dev_kfree_skb(lp->rx_skb[i]);
lp->rx_skb[i] = NULL;
}
}
free_irq(dev->irq, dev); /* release the IRQ */
return 0;
}
static void sonic_tx_timeout(struct net_device *dev)
{
struct sonic_local *lp = netdev_priv(dev);
int i;
/* Stop the interrupts for this */
SONIC_WRITE(SONIC_IMR, 0);
/* We could resend the original skbs. Easier to re-initialise. */
for (i = 0; i < SONIC_NUM_TDS; i++) {
if(lp->tx_laddr[i]) {
dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
lp->tx_laddr[i] = (dma_addr_t)0;
}
if(lp->tx_skb[i]) {
dev_kfree_skb(lp->tx_skb[i]);
lp->tx_skb[i] = NULL;
}
}
/* Try to restart the adaptor. */
sonic_init(dev);
lp->stats.tx_errors++;
dev->trans_start = jiffies;
netif_wake_queue(dev);
}
/*
* transmit packet
*
* Appends new TD during transmission thus avoiding any TX interrupts
* until we run out of TDs.
* This routine interacts closely with the ISR in that it may,
* set tx_skb[i]
* reset the status flags of the new TD
* set and reset EOL flags
* stop the tx queue
* The ISR interacts with this routine in various ways. It may,
* reset tx_skb[i]
* test the EOL and status flags of the TDs
* wake the tx queue
* Concurrently with all of this, the SONIC is potentially writing to
* the status flags of the TDs.
* Until some mutual exclusion is added, this code will not work with SMP. However,
* MIPS Jazz machines and m68k Macs were all uni-processor machines.
*/
static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
{
struct sonic_local *lp = netdev_priv(dev);
dma_addr_t laddr;
int length;
int entry = lp->next_tx;
if (sonic_debug > 2)
printk("sonic_send_packet: skb=%p, dev=%p\n", skb, dev);
length = skb->len;
if (length < ETH_ZLEN) {
if (skb_padto(skb, ETH_ZLEN))
return 0;
length = ETH_ZLEN;
}
/*
* Map the packet data into the logical DMA address space
*/
laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
if (!laddr) {
printk(KERN_ERR "%s: failed to map tx DMA buffer.\n", dev->name);
dev_kfree_skb(skb);
return 1;
}
sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0); /* clear status */
sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1); /* single fragment */
sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff);
sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16);
sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length);
sonic_tda_put(dev, entry, SONIC_TD_LINK,
sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);
/*
* Must set tx_skb[entry] only after clearing status, and
* before clearing EOL and before stopping queue
*/
wmb();
lp->tx_len[entry] = length;
lp->tx_laddr[entry] = laddr;
lp->tx_skb[entry] = skb;
wmb();
sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
lp->eol_tx = entry;
lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
if (lp->tx_skb[lp->next_tx] != NULL) {
/* The ring is full, the ISR has yet to process the next TD. */
if (sonic_debug > 3)
printk("%s: stopping queue\n", dev->name);
netif_stop_queue(dev);
/* after this packet, wait for ISR to free up some TDAs */
} else netif_start_queue(dev);
if (sonic_debug > 2)
printk("sonic_send_packet: issuing Tx command\n");
SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
dev->trans_start = jiffies;
return 0;
}
/*
* The typical workload of the driver:
* Handle the network interface interrupts.
*/
static irqreturn_t sonic_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct net_device *dev = (struct net_device *) dev_id;
struct sonic_local *lp = netdev_priv(dev);
int status;
if (dev == NULL) {
printk(KERN_ERR "sonic_interrupt: irq %d for unknown device.\n", irq);
return IRQ_NONE;
}
if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
return IRQ_NONE;
do {
if (status & SONIC_INT_PKTRX) {
if (sonic_debug > 2)
printk("%s: packet rx\n", dev->name);
sonic_rx(dev); /* got packet(s) */
SONIC_WRITE(SONIC_ISR, SONIC_INT_PKTRX); /* clear the interrupt */
}
if (status & SONIC_INT_TXDN) {
int entry = lp->cur_tx;
int td_status;
int freed_some = 0;
/* At this point, cur_tx is the index of a TD that is one of:
* unallocated/freed (status set & tx_skb[entry] clear)
* allocated and sent (status set & tx_skb[entry] set )
* allocated and not yet sent (status clear & tx_skb[entry] set )
* still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
*/
if (sonic_debug > 2)
printk("%s: tx done\n", dev->name);
while (lp->tx_skb[entry] != NULL) {
if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
break;
if (td_status & 0x0001) {
lp->stats.tx_packets++;
lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
} else {
lp->stats.tx_errors++;
if (td_status & 0x0642)
lp->stats.tx_aborted_errors++;
if (td_status & 0x0180)
lp->stats.tx_carrier_errors++;
if (td_status & 0x0020)
lp->stats.tx_window_errors++;
if (td_status & 0x0004)
lp->stats.tx_fifo_errors++;
}
/* We must free the original skb */
dev_kfree_skb_irq(lp->tx_skb[entry]);
lp->tx_skb[entry] = NULL;
/* and unmap DMA buffer */
dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
lp->tx_laddr[entry] = (dma_addr_t)0;
freed_some = 1;
if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
entry = (entry + 1) & SONIC_TDS_MASK;
break;
}
entry = (entry + 1) & SONIC_TDS_MASK;
}
if (freed_some || lp->tx_skb[entry] == NULL)
netif_wake_queue(dev); /* The ring is no longer full */
lp->cur_tx = entry;
SONIC_WRITE(SONIC_ISR, SONIC_INT_TXDN); /* clear the interrupt */
}
/*
* check error conditions
*/
if (status & SONIC_INT_RFO) {
if (sonic_debug > 1)
printk("%s: rx fifo overrun\n", dev->name);
lp->stats.rx_fifo_errors++;
SONIC_WRITE(SONIC_ISR, SONIC_INT_RFO); /* clear the interrupt */
}
if (status & SONIC_INT_RDE) {
if (sonic_debug > 1)
printk("%s: rx descriptors exhausted\n", dev->name);
lp->stats.rx_dropped++;
SONIC_WRITE(SONIC_ISR, SONIC_INT_RDE); /* clear the interrupt */
}
if (status & SONIC_INT_RBAE) {
if (sonic_debug > 1)
printk("%s: rx buffer area exceeded\n", dev->name);
lp->stats.rx_dropped++;
SONIC_WRITE(SONIC_ISR, SONIC_INT_RBAE); /* clear the interrupt */
}
/* counter overruns; all counters are 16bit wide */
if (status & SONIC_INT_FAE) {
lp->stats.rx_frame_errors += 65536;
SONIC_WRITE(SONIC_ISR, SONIC_INT_FAE); /* clear the interrupt */
}
if (status & SONIC_INT_CRC) {
lp->stats.rx_crc_errors += 65536;
SONIC_WRITE(SONIC_ISR, SONIC_INT_CRC); /* clear the interrupt */
}
if (status & SONIC_INT_MP) {
lp->stats.rx_missed_errors += 65536;
SONIC_WRITE(SONIC_ISR, SONIC_INT_MP); /* clear the interrupt */
}
/* transmit error */
if (status & SONIC_INT_TXER) {
if ((SONIC_READ(SONIC_TCR) & SONIC_TCR_FU) && (sonic_debug > 2))
printk(KERN_ERR "%s: tx fifo underrun\n", dev->name);
SONIC_WRITE(SONIC_ISR, SONIC_INT_TXER); /* clear the interrupt */
}
/* bus retry */
if (status & SONIC_INT_BR) {
printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
dev->name);
/* ... to help debug DMA problems causing endless interrupts. */
/* Bounce the eth interface to turn on the interrupt again. */
SONIC_WRITE(SONIC_IMR, 0);
SONIC_WRITE(SONIC_ISR, SONIC_INT_BR); /* clear the interrupt */
}
/* load CAM done */
if (status & SONIC_INT_LCD)
SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
} while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
return IRQ_HANDLED;
}
/*
* We have a good packet(s), pass it/them up the network stack.
*/
static void sonic_rx(struct net_device *dev)
{
struct sonic_local *lp = netdev_priv(dev);
int status;
int entry = lp->cur_rx;
while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
struct sk_buff *used_skb;
struct sk_buff *new_skb;
dma_addr_t new_laddr;
u16 bufadr_l;
u16 bufadr_h;
int pkt_len;
status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
if (status & SONIC_RCR_PRX) {
/* Malloc up new buffer. */
new_skb = dev_alloc_skb(SONIC_RBSIZE + 2);
if (new_skb == NULL) {
printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n", dev->name);
lp->stats.rx_dropped++;
break;
}
new_skb->dev = dev;
/* provide 16 byte IP header alignment unless DMA requires otherwise */
if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
skb_reserve(new_skb, 2);
new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
SONIC_RBSIZE, DMA_FROM_DEVICE);
if (!new_laddr) {
dev_kfree_skb(new_skb);
printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
lp->stats.rx_dropped++;
break;
}
/* now we have a new skb to replace it, pass the used one up the stack */
dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
used_skb = lp->rx_skb[entry];
pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
skb_trim(used_skb, pkt_len);
used_skb->protocol = eth_type_trans(used_skb, dev);
netif_rx(used_skb);
dev->last_rx = jiffies;
lp->stats.rx_packets++;
lp->stats.rx_bytes += pkt_len;
/* and insert the new skb */
lp->rx_laddr[entry] = new_laddr;
lp->rx_skb[entry] = new_skb;
bufadr_l = (unsigned long)new_laddr & 0xffff;
bufadr_h = (unsigned long)new_laddr >> 16;
sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
} else {
/* This should only happen, if we enable accepting broken packets. */
lp->stats.rx_errors++;
if (status & SONIC_RCR_FAER)
lp->stats.rx_frame_errors++;
if (status & SONIC_RCR_CRCR)
lp->stats.rx_crc_errors++;
}
if (status & SONIC_RCR_LPKT) {
/*
* this was the last packet out of the current receive buffer
* give the buffer back to the SONIC
*/
lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
if (sonic_debug > 2)
printk("%s: rx buffer exhausted\n", dev->name);
SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
}
} else
printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
dev->name);
/*
* give back the descriptor
*/
sonic_rda_put(dev, entry, SONIC_RD_LINK,
sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
lp->eol_rx = entry;
lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
}
/*
* If any worth-while packets have been received, netif_rx()
* has done a mark_bh(NET_BH) for us and will work on them
* when we get to the bottom-half routine.
*/
}
/*
* Get the current statistics.
* This may be called with the device open or closed.
*/
static struct net_device_stats *sonic_get_stats(struct net_device *dev)
{
struct sonic_local *lp = netdev_priv(dev);
/* read the tally counter from the SONIC and reset them */
lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
SONIC_WRITE(SONIC_CRCT, 0xffff);
lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
SONIC_WRITE(SONIC_FAET, 0xffff);
lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
SONIC_WRITE(SONIC_MPT, 0xffff);
return &lp->stats;
}
/*
* Set or clear the multicast filter for this adaptor.
*/
static void sonic_multicast_list(struct net_device *dev)
{
struct sonic_local *lp = netdev_priv(dev);
unsigned int rcr;
struct dev_mc_list *dmi = dev->mc_list;
unsigned char *addr;
int i;
rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
rcr |= SONIC_RCR_BRD; /* accept broadcast packets */
if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
rcr |= SONIC_RCR_PRO;
} else {
if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 15)) {
rcr |= SONIC_RCR_AMC;
} else {
if (sonic_debug > 2)
printk("sonic_multicast_list: mc_count %d\n", dev->mc_count);
sonic_set_cam_enable(dev, 1); /* always enable our own address */
for (i = 1; i <= dev->mc_count; i++) {
addr = dmi->dmi_addr;
dmi = dmi->next;
sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
}
SONIC_WRITE(SONIC_CDC, 16);
/* issue Load CAM command */
SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
}
}
if (sonic_debug > 2)
printk("sonic_multicast_list: setting RCR=%x\n", rcr);
SONIC_WRITE(SONIC_RCR, rcr);
}
/*
* Initialize the SONIC ethernet controller.
*/
static int sonic_init(struct net_device *dev)
{
unsigned int cmd;
struct sonic_local *lp = netdev_priv(dev);
int i;
/*
* put the Sonic into software-reset mode and
* disable all interrupts
*/
SONIC_WRITE(SONIC_IMR, 0);
SONIC_WRITE(SONIC_ISR, 0x7fff);
SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
/*
* clear software reset flag, disable receiver, clear and
* enable interrupts, then completely initialize the SONIC
*/
SONIC_WRITE(SONIC_CMD, 0);
SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
/*
* initialize the receive resource area
*/
if (sonic_debug > 2)
printk("sonic_init: initialize receive resource area\n");
for (i = 0; i < SONIC_NUM_RRS; i++) {
u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
}
/* initialize all RRA registers */
lp->rra_end = (lp->rra_laddr + SONIC_NUM_RRS * SIZEOF_SONIC_RR *
SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
lp->cur_rwp = (lp->rra_laddr + (SONIC_NUM_RRS - 1) * SIZEOF_SONIC_RR *
SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
SONIC_WRITE(SONIC_RSA, lp->rra_laddr & 0xffff);
SONIC_WRITE(SONIC_REA, lp->rra_end);
SONIC_WRITE(SONIC_RRP, lp->rra_laddr & 0xffff);
SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));
/* load the resource pointers */
if (sonic_debug > 3)
printk("sonic_init: issuing RRRA command\n");
SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
i = 0;
while (i++ < 100) {
if (SONIC_READ(SONIC_CMD) & SONIC_CR_RRRA)
break;
}
if (sonic_debug > 2)
printk("sonic_init: status=%x i=%d\n", SONIC_READ(SONIC_CMD), i);
/*
* Initialize the receive descriptors so that they
* become a circular linked list, ie. let the last
* descriptor point to the first again.
*/
if (sonic_debug > 2)
printk("sonic_init: initialize receive descriptors\n");
for (i=0; i<SONIC_NUM_RDS; i++) {
sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
sonic_rda_put(dev, i, SONIC_RD_LINK,
lp->rda_laddr +
((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
}
/* fix last descriptor */
sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
(lp->rda_laddr & 0xffff) | SONIC_EOL);
lp->eol_rx = SONIC_NUM_RDS - 1;
lp->cur_rx = 0;
SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);
/*
* initialize transmit descriptors
*/
if (sonic_debug > 2)
printk("sonic_init: initialize transmit descriptors\n");
for (i = 0; i < SONIC_NUM_TDS; i++) {
sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
sonic_tda_put(dev, i, SONIC_TD_LINK,
(lp->tda_laddr & 0xffff) +
(i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
lp->tx_skb[i] = NULL;
}
/* fix last descriptor */
sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
(lp->tda_laddr & 0xffff));
SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
lp->cur_tx = lp->next_tx = 0;
lp->eol_tx = SONIC_NUM_TDS - 1;
/*
* put our own address to CAM desc[0]
*/
sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
sonic_set_cam_enable(dev, 1);
for (i = 0; i < 16; i++)
sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);
/*
* initialize CAM registers
*/
SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
SONIC_WRITE(SONIC_CDC, 16);
/*
* load the CAM
*/
SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
i = 0;
while (i++ < 100) {
if (SONIC_READ(SONIC_ISR) & SONIC_INT_LCD)
break;
}
if (sonic_debug > 2) {
printk("sonic_init: CMD=%x, ISR=%x\n, i=%d",
SONIC_READ(SONIC_CMD), SONIC_READ(SONIC_ISR), i);
}
/*
* enable receiver, disable loopback
* and enable all interrupts
*/
SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN | SONIC_CR_STP);
SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
SONIC_WRITE(SONIC_ISR, 0x7fff);
SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);
cmd = SONIC_READ(SONIC_CMD);
if ((cmd & SONIC_CR_RXEN) == 0 || (cmd & SONIC_CR_STP) == 0)
printk(KERN_ERR "sonic_init: failed, status=%x\n", cmd);
if (sonic_debug > 2)
printk("sonic_init: new status=%x\n",
SONIC_READ(SONIC_CMD));
return 0;
}
MODULE_LICENSE("GPL");
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