sgiseeq.c
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上传日期:2013-02-24
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- /* $Id: sgiseeq.c,v 1.17 2000/03/27 23:02:57 ralf Exp $
- *
- * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.
- *
- * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
- */
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/interrupt.h>
- #include <linux/ptrace.h>
- #include <linux/ioport.h>
- #include <linux/in.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include <linux/delay.h>
- #include <asm/io.h>
- #include <asm/segment.h>
- #include <asm/system.h>
- #include <asm/bitops.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <linux/errno.h>
- #include <asm/byteorder.h>
- #include <linux/socket.h>
- #include <linux/route.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #include <asm/sgi/sgihpc.h>
- #include <asm/sgi/sgint23.h>
- #include <asm/sgialib.h>
- #include "sgiseeq.h"
- static char *version =
- "sgiseeq.c: David S. Miller (dm@engr.sgi.com)n";
- static char *sgiseeqstr = "SGI Seeq8003";
- /* If you want speed, you do something silly, it always has worked
- * for me. So, with that in mind, I've decided to make this driver
- * look completely like a stupid Lance from a driver architecture
- * perspective. Only difference is that here our "ring buffer" looks
- * and acts like a real Lance one does but is layed out like how the
- * HPC DMA and the Seeq want it to. You'd be surprised how a stupid
- * idea like this can pay off in performance, not to mention making
- * this driver 2,000 times easier to write. ;-)
- */
- /* Tune these if we tend to run out often etc. */
- #define SEEQ_RX_BUFFERS 16
- #define SEEQ_TX_BUFFERS 16
- #define PKT_BUF_SZ 1584
- #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
- #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
- #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
- #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
- #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ?
- sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new :
- sp->tx_old - sp->tx_new - 1)
- #define DEBUG
- struct sgiseeq_rx_desc {
- struct hpc_dma_desc rdma;
- signed int buf_vaddr;
- };
- struct sgiseeq_tx_desc {
- struct hpc_dma_desc tdma;
- signed int buf_vaddr;
- };
- /* Warning: This structure is layed out in a certain way because
- * HPC dma descriptors must be 8-byte aligned. So don't
- * touch this without some care.
- */
- struct sgiseeq_init_block { /* Note the name ;-) */
- /* Ptrs to the descriptors in KSEG1 uncached space. */
- struct sgiseeq_rx_desc *rx_desc;
- struct sgiseeq_tx_desc *tx_desc;
- unsigned int _padding[30]; /* Pad out to largest cache line size. */
- struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
- struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
- };
- struct sgiseeq_private {
- volatile struct sgiseeq_init_block srings;
- char *name;
- volatile struct hpc3_ethregs *hregs;
- volatile struct sgiseeq_regs *sregs;
- /* Ring entry counters. */
- unsigned int rx_new, tx_new;
- unsigned int rx_old, tx_old;
- int is_edlc;
- unsigned char control;
- unsigned char mode;
- struct net_device_stats stats;
- };
- static inline void hpc3_eth_reset(volatile struct hpc3_ethregs *hregs)
- {
- hregs->rx_reset = (HPC3_ERXRST_CRESET | HPC3_ERXRST_CLRIRQ);
- udelay(20);
- hregs->rx_reset = 0;
- }
- static inline void reset_hpc3_and_seeq(volatile struct hpc3_ethregs *hregs,
- volatile struct sgiseeq_regs *sregs)
- {
- hregs->rx_ctrl = hregs->tx_ctrl = 0;
- hpc3_eth_reset(hregs);
- }
- #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT |
- SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
- static inline void seeq_go(struct sgiseeq_private *sp,
- volatile struct hpc3_ethregs *hregs,
- volatile struct sgiseeq_regs *sregs)
- {
- sregs->rstat = sp->mode | RSTAT_GO_BITS;
- hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
- }
- static inline void seeq_load_eaddr(struct net_device *dev,
- volatile struct sgiseeq_regs *sregs)
- {
- int i;
- sregs->tstat = SEEQ_TCMD_RB0;
- for (i = 0; i < 6; i++)
- sregs->rw.eth_addr[i] = dev->dev_addr[i];
- }
- #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
- #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
- #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
- static int seeq_init_ring(struct net_device *dev)
- {
- struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
- volatile struct sgiseeq_init_block *ib = &sp->srings;
- int i;
- netif_stop_queue(dev);
- sp->rx_new = sp->tx_new = 0;
- sp->rx_old = sp->tx_old = 0;
- seeq_load_eaddr(dev, sp->sregs);
- /* XXX for now just accept packets directly to us
- * XXX and ether-broadcast. Will do multicast and
- * XXX promiscuous mode later. -davem
- */
- sp->mode = SEEQ_RCMD_RBCAST;
- /* Setup tx ring. */
- for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
- if(!ib->tx_desc[i].tdma.pbuf) {
- unsigned long buffer;
- buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
- if (!buffer)
- return -ENOMEM;
- ib->tx_desc[i].buf_vaddr = KSEG1ADDR(buffer);
- ib->tx_desc[i].tdma.pbuf = PHYSADDR(buffer);
- // flush_cache_all();
- }
- ib->tx_desc[i].tdma.cntinfo = (TCNTINFO_INIT);
- }
- /* And now the rx ring. */
- for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
- if (!ib->rx_desc[i].rdma.pbuf) {
- unsigned long buffer;
- buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
- if (!buffer)
- return -ENOMEM;
- ib->rx_desc[i].buf_vaddr = KSEG1ADDR(buffer);
- ib->rx_desc[i].rdma.pbuf = PHYSADDR(buffer);
- // flush_cache_all();
- }
- ib->rx_desc[i].rdma.cntinfo = (RCNTINFO_INIT);
- }
- ib->rx_desc[i - 1].rdma.cntinfo |= (HPCDMA_EOR);
- return 0;
- }
- #ifdef DEBUG
- static struct sgiseeq_private *gpriv;
- static struct net_device *gdev;
- void sgiseeq_dump_rings(void)
- {
- static int once;
- struct sgiseeq_rx_desc *r = gpriv->srings.rx_desc;
- struct sgiseeq_tx_desc *t = gpriv->srings.tx_desc;
- volatile struct hpc3_ethregs *hregs = gpriv->hregs;
- int i;
- if(once)
- return;
- once++;
- printk("RING DUMP:n");
- for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
- printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
- i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
- r[i].rdma.pnext);
- i += 1;
- printk("-- [%d]: @(%p) [%08x,%08x,%08x]n",
- i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
- r[i].rdma.pnext);
- }
- for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
- printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
- i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
- t[i].tdma.pnext);
- i += 1;
- printk("-- [%d]: @(%p) [%08x,%08x,%08x]n",
- i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
- t[i].tdma.pnext);
- }
- printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]n",
- gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
- printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]n",
- hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
- printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]n",
- hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
- }
- #endif
- #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
- #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
- #define RDMACFG_INIT (HPC3_ERXDCFG_FRXDC | HPC3_ERXDCFG_FEOP | HPC3_ERXDCFG_FIRQ)
- static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
- volatile struct sgiseeq_regs *sregs)
- {
- volatile struct hpc3_ethregs *hregs = sp->hregs;
- int err;
- reset_hpc3_and_seeq(hregs, sregs);
- err = seeq_init_ring(dev);
- if (err)
- return err;
- /* Setup to field the proper interrupt types. */
- if (sp->is_edlc) {
- sregs->tstat = (TSTAT_INIT_EDLC);
- sregs->rw.wregs.control = sp->control;
- sregs->rw.wregs.frame_gap = 0;
- } else {
- sregs->tstat = (TSTAT_INIT_SEEQ);
- }
- hregs->rx_dconfig |= RDMACFG_INIT;
- hregs->rx_ndptr = PHYSADDR(&sp->srings.rx_desc[0]);
- hregs->tx_ndptr = PHYSADDR(&sp->srings.tx_desc[0]);
- seeq_go(sp, hregs, sregs);
- return 0;
- }
- static inline void record_rx_errors(struct sgiseeq_private *sp,
- unsigned char status)
- {
- if (status & SEEQ_RSTAT_OVERF ||
- status & SEEQ_RSTAT_SFRAME)
- sp->stats.rx_over_errors++;
- if (status & SEEQ_RSTAT_CERROR)
- sp->stats.rx_crc_errors++;
- if (status & SEEQ_RSTAT_DERROR)
- sp->stats.rx_frame_errors++;
- if (status & SEEQ_RSTAT_REOF)
- sp->stats.rx_errors++;
- }
- static inline void rx_maybe_restart(struct sgiseeq_private *sp,
- volatile struct hpc3_ethregs *hregs,
- volatile struct sgiseeq_regs *sregs)
- {
- if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
- hregs->rx_ndptr = PHYSADDR(&sp->srings.rx_desc[sp->rx_new]);
- seeq_go(sp, hregs, sregs);
- }
- }
- #define for_each_rx(rd, sp) for((rd) = &(sp)->srings.rx_desc[(sp)->rx_new];
- !((rd)->rdma.cntinfo & HPCDMA_OWN);
- (rd) = &(sp)->srings.rx_desc[(sp)->rx_new])
- static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
- volatile struct hpc3_ethregs *hregs,
- volatile struct sgiseeq_regs *sregs)
- {
- struct sgiseeq_rx_desc *rd;
- struct sk_buff *skb = 0;
- unsigned char pkt_status;
- unsigned char *pkt_pointer = 0;
- int len = 0;
- unsigned int orig_end = PREV_RX(sp->rx_new);
- /* Service every received packet. */
- for_each_rx(rd, sp) {
- len = (PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3);
- pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
- pkt_status = pkt_pointer[len + 2];
- if (pkt_status & SEEQ_RSTAT_FIG) {
- /* Packet is OK. */
- skb = dev_alloc_skb(len + 2);
- if (skb) {
- skb->dev = dev;
- skb_reserve(skb, 2);
- skb_put(skb, len);
- /* Copy out of kseg1 to avoid silly cache flush. */
- eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);
- skb->protocol = eth_type_trans(skb, dev);
- netif_rx(skb);
- dev->last_rx = jiffies;
- sp->stats.rx_packets++;
- sp->stats.rx_bytes += len;
- } else {
- printk ("%s: Memory squeeze, deferring packet.n",
- dev->name);
- sp->stats.rx_dropped++;
- }
- } else {
- record_rx_errors(sp, pkt_status);
- }
- /* Return the entry to the ring pool. */
- rd->rdma.cntinfo = (RCNTINFO_INIT);
- sp->rx_new = NEXT_RX(sp->rx_new);
- }
- sp->srings.rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
- sp->srings.rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
- rx_maybe_restart(sp, hregs, sregs);
- }
- static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
- volatile struct sgiseeq_regs *sregs)
- {
- if (sp->is_edlc) {
- sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
- sregs->rw.wregs.control = sp->control;
- }
- }
- static inline void kick_tx(struct sgiseeq_tx_desc *td,
- volatile struct hpc3_ethregs *hregs)
- {
- /* If the HPC aint doin nothin, and there are more packets
- * with ETXD cleared and XIU set we must make very certain
- * that we restart the HPC else we risk locking up the
- * adapter. The following code is only safe iff the HPCDMA
- * is not active!
- */
- while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
- (HPCDMA_XIU | HPCDMA_ETXD))
- td = (struct sgiseeq_tx_desc *)(long) KSEG1ADDR(td->tdma.pnext);
- if (td->tdma.cntinfo & HPCDMA_XIU) {
- hregs->tx_ndptr = PHYSADDR(td);
- hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
- }
- }
- static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
- volatile struct hpc3_ethregs *hregs,
- volatile struct sgiseeq_regs *sregs)
- {
- struct sgiseeq_tx_desc *td;
- unsigned long status = hregs->tx_ctrl;
- int j;
- tx_maybe_reset_collisions(sp, sregs);
- if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
- /* Oops, HPC detected some sort of error. */
- if (status & SEEQ_TSTAT_R16)
- sp->stats.tx_aborted_errors++;
- if (status & SEEQ_TSTAT_UFLOW)
- sp->stats.tx_fifo_errors++;
- if (status & SEEQ_TSTAT_LCLS)
- sp->stats.collisions++;
- }
- /* Ack 'em... */
- for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
- td = &sp->srings.tx_desc[j];
- if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
- break;
- if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
- if(!(status & HPC3_ETXCTRL_ACTIVE)) {
- hregs->tx_ndptr = PHYSADDR(td);
- hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
- }
- break;
- }
- sp->stats.tx_packets++;
- sp->tx_old = NEXT_TX(sp->tx_old);
- td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
- td->tdma.cntinfo |= HPCDMA_EOX;
- }
- }
- static void sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs)
- {
- struct net_device *dev = (struct net_device *) dev_id;
- struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
- volatile struct hpc3_ethregs *hregs = sp->hregs;
- volatile struct sgiseeq_regs *sregs = sp->sregs;
- /* Ack the IRQ and set software state. */
- hregs->rx_reset = HPC3_ERXRST_CLRIRQ;
- /* Always check for received packets. */
- sgiseeq_rx(dev, sp, hregs, sregs);
- /* Only check for tx acks iff we have something queued. */
- if (sp->tx_old != sp->tx_new)
- sgiseeq_tx(dev, sp, hregs, sregs);
- if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
- netif_wake_queue(dev);
- }
- }
- static int sgiseeq_open(struct net_device *dev)
- {
- struct sgiseeq_private *sp = (struct sgiseeq_private *)dev->priv;
- volatile struct sgiseeq_regs *sregs = sp->sregs;
- unsigned long flags;
- int err;
- save_flags(flags); cli();
- if (request_irq(dev->irq, sgiseeq_interrupt, 0, sgiseeqstr, (void *) dev)) {
- printk("Seeq8003: Can't get irq %dn", dev->irq);
- restore_flags(flags);
- return -EAGAIN;
- }
- err = init_seeq(dev, sp, sregs);
- if (err)
- return err;
- netif_start_queue(dev);
- restore_flags(flags);
- return 0;
- }
- static int sgiseeq_close(struct net_device *dev)
- {
- struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
- volatile struct sgiseeq_regs *sregs = sp->sregs;
- netif_stop_queue(dev);
- /* Shutdown the Seeq. */
- reset_hpc3_and_seeq(sp->hregs, sregs);
- free_irq(dev->irq, dev);
- return 0;
- }
- static inline int sgiseeq_reset(struct net_device *dev)
- {
- struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
- volatile struct sgiseeq_regs *sregs = sp->sregs;
- int err;
- err = init_seeq(dev, sp, sregs);
- if (err)
- return err;
- dev->trans_start = jiffies;
- netif_wake_queue(dev);
- return 0;
- }
- void sgiseeq_my_reset(void)
- {
- printk("RESET!n");
- sgiseeq_reset(gdev);
- }
- static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
- {
- struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
- volatile struct hpc3_ethregs *hregs = sp->hregs;
- unsigned long flags;
- struct sgiseeq_tx_desc *td;
- int skblen, len, entry;
- save_and_cli(flags);
- /* Setup... */
- skblen = skb->len;
- len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
- sp->stats.tx_bytes += len;
- entry = sp->tx_new;
- td = &sp->srings.tx_desc[entry];
- /* Create entry. There are so many races with adding a new
- * descriptor to the chain:
- * 1) Assume that the HPC is off processing a DMA chain while
- * we are changing all of the following.
- * 2) Do no allow the HPC to look at a new descriptor until
- * we have completely set up it's state. This means, do
- * not clear HPCDMA_EOX in the current last descritptor
- * until the one we are adding looks consistant and could
- * be processes right now.
- * 3) The tx interrupt code must notice when we've added a new
- * entry and the HPC got to the end of the chain before we
- * added this new entry and restarted it.
- */
- memcpy((char *)(long)td->buf_vaddr, skb->data, skblen);
- td->tdma.cntinfo = (len & HPCDMA_BCNT) |
- (HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX);
- if (sp->tx_old != sp->tx_new) {
- struct sgiseeq_tx_desc *backend;
- backend = &sp->srings.tx_desc[PREV_TX(sp->tx_new)];
- backend->tdma.cntinfo &= ~(HPCDMA_EOX);
- }
- sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
- /* Maybe kick the HPC back into motion. */
- if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
- kick_tx(&sp->srings.tx_desc[sp->tx_old], hregs);
- dev->trans_start = jiffies;
- dev_kfree_skb(skb);
- if (!TX_BUFFS_AVAIL(sp))
- netif_stop_queue(dev);
- restore_flags(flags);
- return 0;
- }
- static void timeout(struct net_device *dev)
- {
- printk("%s: transmit timed out, resettingn", dev->name);
- sgiseeq_reset(dev);
- dev->trans_start = jiffies;
- netif_wake_queue(dev);
- }
- static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev)
- {
- struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
- return &sp->stats;
- }
- static void sgiseeq_set_multicast(struct net_device *dev)
- {
- }
- static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)
- {
- int i = 0;
- while (i < (nbufs - 1)) {
- buf[i].tdma.pnext = PHYSADDR(&buf[i + 1]);
- buf[i].tdma.pbuf = 0;
- i++;
- }
- buf[i].tdma.pnext = PHYSADDR(&buf[0]);
- }
- static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
- {
- int i = 0;
- while (i < (nbufs - 1)) {
- buf[i].rdma.pnext = PHYSADDR(&buf[i + 1]);
- buf[i].rdma.pbuf = 0;
- i++;
- }
- buf[i].rdma.pbuf = 0;
- buf[i].rdma.pnext = PHYSADDR(&buf[0]);
- }
- static char onboard_eth_addr[6];
- #define ALIGNED(x) ((((unsigned long)(x)) + 0xf) & ~(0xf))
- int sgiseeq_init(struct net_device *dev, struct sgiseeq_regs *sregs,
- struct hpc3_ethregs *hregs, int irq)
- {
- static unsigned version_printed;
- int i;
- struct sgiseeq_private *sp;
- dev->priv = (struct sgiseeq_private *) get_free_page(GFP_KERNEL);
- if (dev->priv == NULL)
- return -ENOMEM;
- if (!version_printed++)
- printk(version);
- printk("%s: SGI Seeq8003 ", dev->name);
- for (i = 0; i < 6; i++)
- printk("%2.2x%c",
- dev->dev_addr[i] = onboard_eth_addr[i],
- i == 5 ? ' ': ':');
- printk("n");
- sp = (struct sgiseeq_private *) dev->priv;
- #ifdef DEBUG
- gpriv = sp;
- gdev = dev;
- #endif
- memset((char *)dev->priv, 0, sizeof(struct sgiseeq_private));
- sp->sregs = sregs;
- sp->hregs = hregs;
- sp->name = sgiseeqstr;
- sp->srings.rx_desc = (struct sgiseeq_rx_desc *)
- (KSEG1ADDR(ALIGNED(&sp->srings.rxvector[0])));
- dma_cache_wback_inv((unsigned long)&sp->srings.rxvector,
- sizeof(sp->srings.rxvector));
- sp->srings.tx_desc = (struct sgiseeq_tx_desc *)
- (KSEG1ADDR(ALIGNED(&sp->srings.txvector[0])));
- dma_cache_wback_inv((unsigned long)&sp->srings.txvector,
- sizeof(sp->srings.txvector));
- /* A couple calculations now, saves many cycles later. */
- setup_rx_ring(sp->srings.rx_desc, SEEQ_RX_BUFFERS);
- setup_tx_ring(sp->srings.tx_desc, SEEQ_TX_BUFFERS);
- /* Reset the chip. */
- hpc3_eth_reset((volatile struct hpc3_ethregs *) hregs);
- sp->is_edlc = !(sregs->rw.rregs.collision_tx[0] & 0xff);
- if (sp->is_edlc) {
- sp->control = (SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
- SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
- SEEQ_CTRL_ENCARR);
- }
- dev->open = sgiseeq_open;
- dev->stop = sgiseeq_close;
- dev->hard_start_xmit = sgiseeq_start_xmit;
- dev->tx_timeout = timeout;
- dev->watchdog_timeo = (200 * HZ) / 1000;
- dev->get_stats = sgiseeq_get_stats;
- dev->set_multicast_list = sgiseeq_set_multicast;
- dev->irq = irq;
- dev->dma = 0;
- ether_setup(dev);
- return 0;
- }
- static inline unsigned char str2hexnum(unsigned char c)
- {
- if (c >= '0' && c <= '9')
- return c - '0';
- if (c >= 'a' && c <= 'f')
- return c - 'a' + 10;
- return 0; /* foo */
- }
- static inline void str2eaddr(unsigned char *ea, unsigned char *str)
- {
- int i;
- for (i = 0; i < 6; i++) {
- unsigned char num;
- if(*str == ':')
- str++;
- num = str2hexnum(*str++) << 4;
- num |= (str2hexnum(*str++));
- ea[i] = num;
- }
- }
- int sgiseeq_probe(struct net_device *dev)
- {
- static int initialized;
- char *ep;
- if (initialized) /* Already initialized? */
- return 1;
- initialized++;
- /* First get the ethernet address of the onboard interface from ARCS.
- * This is fragile; PROM doesn't like running from cache.
- * On MIPS64 it crashes for some other, yet unknown reason ...
- */
- ep = ArcGetEnvironmentVariable("eaddr");
- str2eaddr(onboard_eth_addr, ep);
- return sgiseeq_init(dev,
- (struct sgiseeq_regs *) (KSEG1ADDR(0x1fbd4000)),
- &hpc3c0->ethregs, SGI_ENET_IRQ);
- }