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linux/drivers/net/sonic.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

742 lines
22 KiB
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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");
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;
}
/* 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;
}
}
return 0;
}
static void sonic_tx_timeout(struct net_device *dev)
{
struct sonic_local *lp = netdev_priv(dev);
int i;
/*
* put the Sonic into software-reset mode and
* disable all interrupts before releasing DMA buffers
*/
SONIC_WRITE(SONIC_IMR, 0);
SONIC_WRITE(SONIC_ISR, 0x7fff);
SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
/* 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 net_device *dev = dev_id;
struct sonic_local *lp = netdev_priv(dev);
int status;
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;
}
/* 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);
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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