diff options
Diffstat (limited to 'drivers/net/ethernet/seeq/sgiseeq.c')
| -rw-r--r-- | drivers/net/ethernet/seeq/sgiseeq.c | 858 |
1 files changed, 858 insertions, 0 deletions
diff --git a/drivers/net/ethernet/seeq/sgiseeq.c b/drivers/net/ethernet/seeq/sgiseeq.c new file mode 100644 index 000000000000..52fb7ed9f365 --- /dev/null +++ b/drivers/net/ethernet/seeq/sgiseeq.c @@ -0,0 +1,858 @@ +/* + * sgiseeq.c: Seeq8003 ethernet driver for SGI machines. + * + * Copyright (C) 1996 David S. Miller (davem@davemloft.net) + */ + +#undef DEBUG + +#include <linux/dma-mapping.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/string.h> +#include <linux/delay.h> +#include <linux/netdevice.h> +#include <linux/platform_device.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> + +#include <asm/sgi/hpc3.h> +#include <asm/sgi/ip22.h> +#include <asm/sgi/seeq.h> + +#include "sgiseeq.h" + +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 + * laid 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 VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \ + (dma_addr_t)((unsigned long)(v) - \ + (unsigned long)((sp)->rx_desc))) + +/* Copy frames shorter than rx_copybreak, otherwise pass on up in + * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha). + */ +static int rx_copybreak = 100; + +#define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *)) + +struct sgiseeq_rx_desc { + volatile struct hpc_dma_desc rdma; + u8 padding[PAD_SIZE]; + struct sk_buff *skb; +}; + +struct sgiseeq_tx_desc { + volatile struct hpc_dma_desc tdma; + u8 padding[PAD_SIZE]; + struct sk_buff *skb; +}; + +/* + * Warning: This structure is laid 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 ;-) */ + struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS]; + struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS]; +}; + +struct sgiseeq_private { + struct sgiseeq_init_block *srings; + dma_addr_t srings_dma; + + /* Ptrs to the descriptors in uncached space. */ + struct sgiseeq_rx_desc *rx_desc; + struct sgiseeq_tx_desc *tx_desc; + + char *name; + struct hpc3_ethregs *hregs; + 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; + + spinlock_t tx_lock; +}; + +static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr) +{ + dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc), + DMA_FROM_DEVICE); +} + +static inline void dma_sync_desc_dev(struct net_device *dev, void *addr) +{ + dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc), + DMA_TO_DEVICE); +} + +static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs) +{ + hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ; + udelay(20); + hregs->reset = 0; +} + +static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs, + 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, + struct hpc3_ethregs *hregs, + struct sgiseeq_regs *sregs) +{ + sregs->rstat = sp->mode | RSTAT_GO_BITS; + hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE; +} + +static inline void __sgiseeq_set_mac_address(struct net_device *dev) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + struct sgiseeq_regs *sregs = sp->sregs; + int i; + + sregs->tstat = SEEQ_TCMD_RB0; + for (i = 0; i < 6; i++) + sregs->rw.eth_addr[i] = dev->dev_addr[i]; +} + +static int sgiseeq_set_mac_address(struct net_device *dev, void *addr) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + struct sockaddr *sa = addr; + + memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); + + spin_lock_irq(&sp->tx_lock); + __sgiseeq_set_mac_address(dev); + spin_unlock_irq(&sp->tx_lock); + + return 0; +} + +#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 = netdev_priv(dev); + int i; + + netif_stop_queue(dev); + sp->rx_new = sp->tx_new = 0; + sp->rx_old = sp->tx_old = 0; + + __sgiseeq_set_mac_address(dev); + + /* Setup tx ring. */ + for(i = 0; i < SEEQ_TX_BUFFERS; i++) { + sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT; + dma_sync_desc_dev(dev, &sp->tx_desc[i]); + } + + /* And now the rx ring. */ + for (i = 0; i < SEEQ_RX_BUFFERS; i++) { + if (!sp->rx_desc[i].skb) { + dma_addr_t dma_addr; + struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ); + + if (skb == NULL) + return -ENOMEM; + skb_reserve(skb, 2); + dma_addr = dma_map_single(dev->dev.parent, + skb->data - 2, + PKT_BUF_SZ, DMA_FROM_DEVICE); + sp->rx_desc[i].skb = skb; + sp->rx_desc[i].rdma.pbuf = dma_addr; + } + sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT; + dma_sync_desc_dev(dev, &sp->rx_desc[i]); + } + sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR; + dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]); + return 0; +} + +static void seeq_purge_ring(struct net_device *dev) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + int i; + + /* clear tx ring. */ + for (i = 0; i < SEEQ_TX_BUFFERS; i++) { + if (sp->tx_desc[i].skb) { + dev_kfree_skb(sp->tx_desc[i].skb); + sp->tx_desc[i].skb = NULL; + } + } + + /* And now the rx ring. */ + for (i = 0; i < SEEQ_RX_BUFFERS; i++) { + if (sp->rx_desc[i].skb) { + dev_kfree_skb(sp->rx_desc[i].skb); + sp->rx_desc[i].skb = NULL; + } + } +} + +#ifdef DEBUG +static struct sgiseeq_private *gpriv; +static struct net_device *gdev; + +static void sgiseeq_dump_rings(void) +{ + static int once; + struct sgiseeq_rx_desc *r = gpriv->rx_desc; + struct sgiseeq_tx_desc *t = gpriv->tx_desc; + 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) + +static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp, + struct sgiseeq_regs *sregs) +{ + 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_ndptr = VIRT_TO_DMA(sp, sp->rx_desc); + hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc); + + seeq_go(sp, hregs, sregs); + return 0; +} + +static void record_rx_errors(struct net_device *dev, unsigned char status) +{ + if (status & SEEQ_RSTAT_OVERF || + status & SEEQ_RSTAT_SFRAME) + dev->stats.rx_over_errors++; + if (status & SEEQ_RSTAT_CERROR) + dev->stats.rx_crc_errors++; + if (status & SEEQ_RSTAT_DERROR) + dev->stats.rx_frame_errors++; + if (status & SEEQ_RSTAT_REOF) + dev->stats.rx_errors++; +} + +static inline void rx_maybe_restart(struct sgiseeq_private *sp, + struct hpc3_ethregs *hregs, + struct sgiseeq_regs *sregs) +{ + if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) { + hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new); + seeq_go(sp, hregs, sregs); + } +} + +static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp, + struct hpc3_ethregs *hregs, + struct sgiseeq_regs *sregs) +{ + struct sgiseeq_rx_desc *rd; + struct sk_buff *skb = NULL; + struct sk_buff *newskb; + unsigned char pkt_status; + int len = 0; + unsigned int orig_end = PREV_RX(sp->rx_new); + + /* Service every received packet. */ + rd = &sp->rx_desc[sp->rx_new]; + dma_sync_desc_cpu(dev, rd); + while (!(rd->rdma.cntinfo & HPCDMA_OWN)) { + len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3; + dma_unmap_single(dev->dev.parent, rd->rdma.pbuf, + PKT_BUF_SZ, DMA_FROM_DEVICE); + pkt_status = rd->skb->data[len]; + if (pkt_status & SEEQ_RSTAT_FIG) { + /* Packet is OK. */ + /* We don't want to receive our own packets */ + if (memcmp(rd->skb->data + 6, dev->dev_addr, ETH_ALEN)) { + if (len > rx_copybreak) { + skb = rd->skb; + newskb = netdev_alloc_skb(dev, PKT_BUF_SZ); + if (!newskb) { + newskb = skb; + skb = NULL; + goto memory_squeeze; + } + skb_reserve(newskb, 2); + } else { + skb = netdev_alloc_skb_ip_align(dev, len); + if (skb) + skb_copy_to_linear_data(skb, rd->skb->data, len); + + newskb = rd->skb; + } +memory_squeeze: + if (skb) { + skb_put(skb, len); + skb->protocol = eth_type_trans(skb, dev); + netif_rx(skb); + dev->stats.rx_packets++; + dev->stats.rx_bytes += len; + } else { + printk(KERN_NOTICE "%s: Memory squeeze, deferring packet.\n", + dev->name); + dev->stats.rx_dropped++; + } + } else { + /* Silently drop my own packets */ + newskb = rd->skb; + } + } else { + record_rx_errors(dev, pkt_status); + newskb = rd->skb; + } + rd->skb = newskb; + rd->rdma.pbuf = dma_map_single(dev->dev.parent, + newskb->data - 2, + PKT_BUF_SZ, DMA_FROM_DEVICE); + + /* Return the entry to the ring pool. */ + rd->rdma.cntinfo = RCNTINFO_INIT; + sp->rx_new = NEXT_RX(sp->rx_new); + dma_sync_desc_dev(dev, rd); + rd = &sp->rx_desc[sp->rx_new]; + dma_sync_desc_cpu(dev, rd); + } + dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]); + sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR); + dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]); + dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]); + sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR; + dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]); + rx_maybe_restart(sp, hregs, sregs); +} + +static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp, + 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 net_device *dev, + struct sgiseeq_private *sp, + struct hpc3_ethregs *hregs) +{ + struct sgiseeq_tx_desc *td; + int i = sp->tx_old; + + /* 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! + */ + td = &sp->tx_desc[i]; + dma_sync_desc_cpu(dev, td); + while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) == + (HPCDMA_XIU | HPCDMA_ETXD)) { + i = NEXT_TX(i); + td = &sp->tx_desc[i]; + dma_sync_desc_cpu(dev, td); + } + if (td->tdma.cntinfo & HPCDMA_XIU) { + hregs->tx_ndptr = VIRT_TO_DMA(sp, td); + hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; + } +} + +static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp, + struct hpc3_ethregs *hregs, + 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) + dev->stats.tx_aborted_errors++; + if (status & SEEQ_TSTAT_UFLOW) + dev->stats.tx_fifo_errors++; + if (status & SEEQ_TSTAT_LCLS) + dev->stats.collisions++; + } + + /* Ack 'em... */ + for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) { + td = &sp->tx_desc[j]; + + dma_sync_desc_cpu(dev, td); + if (!(td->tdma.cntinfo & (HPCDMA_XIU))) + break; + if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) { + if (!(status & HPC3_ETXCTRL_ACTIVE)) { + hregs->tx_ndptr = VIRT_TO_DMA(sp, td); + hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; + } + break; + } + dev->stats.tx_packets++; + sp->tx_old = NEXT_TX(sp->tx_old); + td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE); + td->tdma.cntinfo |= HPCDMA_EOX; + if (td->skb) { + dev_kfree_skb_any(td->skb); + td->skb = NULL; + } + dma_sync_desc_dev(dev, td); + } +} + +static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = (struct net_device *) dev_id; + struct sgiseeq_private *sp = netdev_priv(dev); + struct hpc3_ethregs *hregs = sp->hregs; + struct sgiseeq_regs *sregs = sp->sregs; + + spin_lock(&sp->tx_lock); + + /* Ack the IRQ and set software state. */ + hregs->reset = HPC3_ERST_CLRIRQ; + + /* Always check for received packets. */ + sgiseeq_rx(dev, sp, hregs, sregs); + + /* Only check for tx acks if 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); + } + spin_unlock(&sp->tx_lock); + + return IRQ_HANDLED; +} + +static int sgiseeq_open(struct net_device *dev) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + struct sgiseeq_regs *sregs = sp->sregs; + unsigned int irq = dev->irq; + int err; + + if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) { + printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq); + return -EAGAIN; + } + + err = init_seeq(dev, sp, sregs); + if (err) + goto out_free_irq; + + netif_start_queue(dev); + + return 0; + +out_free_irq: + free_irq(irq, dev); + + return err; +} + +static int sgiseeq_close(struct net_device *dev) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + struct sgiseeq_regs *sregs = sp->sregs; + unsigned int irq = dev->irq; + + netif_stop_queue(dev); + + /* Shutdown the Seeq. */ + reset_hpc3_and_seeq(sp->hregs, sregs); + free_irq(irq, dev); + seeq_purge_ring(dev); + + return 0; +} + +static inline int sgiseeq_reset(struct net_device *dev) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + struct sgiseeq_regs *sregs = sp->sregs; + int err; + + err = init_seeq(dev, sp, sregs); + if (err) + return err; + + dev->trans_start = jiffies; /* prevent tx timeout */ + netif_wake_queue(dev); + + return 0; +} + +static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + struct hpc3_ethregs *hregs = sp->hregs; + unsigned long flags; + struct sgiseeq_tx_desc *td; + int len, entry; + + spin_lock_irqsave(&sp->tx_lock, flags); + + /* Setup... */ + len = skb->len; + if (len < ETH_ZLEN) { + if (skb_padto(skb, ETH_ZLEN)) { + spin_unlock_irqrestore(&sp->tx_lock, flags); + return NETDEV_TX_OK; + } + len = ETH_ZLEN; + } + + dev->stats.tx_bytes += len; + entry = sp->tx_new; + td = &sp->tx_desc[entry]; + dma_sync_desc_cpu(dev, td); + + /* 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 consistent 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. + */ + td->skb = skb; + td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data, + len, DMA_TO_DEVICE); + td->tdma.cntinfo = (len & HPCDMA_BCNT) | + HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX; + dma_sync_desc_dev(dev, td); + if (sp->tx_old != sp->tx_new) { + struct sgiseeq_tx_desc *backend; + + backend = &sp->tx_desc[PREV_TX(sp->tx_new)]; + dma_sync_desc_cpu(dev, backend); + backend->tdma.cntinfo &= ~HPCDMA_EOX; + dma_sync_desc_dev(dev, backend); + } + 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(dev, sp, hregs); + + if (!TX_BUFFS_AVAIL(sp)) + netif_stop_queue(dev); + spin_unlock_irqrestore(&sp->tx_lock, flags); + + return NETDEV_TX_OK; +} + +static void timeout(struct net_device *dev) +{ + printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name); + sgiseeq_reset(dev); + + dev->trans_start = jiffies; /* prevent tx timeout */ + netif_wake_queue(dev); +} + +static void sgiseeq_set_multicast(struct net_device *dev) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + unsigned char oldmode = sp->mode; + + if(dev->flags & IFF_PROMISC) + sp->mode = SEEQ_RCMD_RANY; + else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) + sp->mode = SEEQ_RCMD_RBMCAST; + else + sp->mode = SEEQ_RCMD_RBCAST; + + /* XXX I know this sucks, but is there a better way to reprogram + * XXX the receiver? At least, this shouldn't happen too often. + */ + + if (oldmode != sp->mode) + sgiseeq_reset(dev); +} + +static inline void setup_tx_ring(struct net_device *dev, + struct sgiseeq_tx_desc *buf, + int nbufs) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + int i = 0; + + while (i < (nbufs - 1)) { + buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1); + buf[i].tdma.pbuf = 0; + dma_sync_desc_dev(dev, &buf[i]); + i++; + } + buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf); + dma_sync_desc_dev(dev, &buf[i]); +} + +static inline void setup_rx_ring(struct net_device *dev, + struct sgiseeq_rx_desc *buf, + int nbufs) +{ + struct sgiseeq_private *sp = netdev_priv(dev); + int i = 0; + + while (i < (nbufs - 1)) { + buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1); + buf[i].rdma.pbuf = 0; + dma_sync_desc_dev(dev, &buf[i]); + i++; + } + buf[i].rdma.pbuf = 0; + buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf); + dma_sync_desc_dev(dev, &buf[i]); +} + +static const struct net_device_ops sgiseeq_netdev_ops = { + .ndo_open = sgiseeq_open, + .ndo_stop = sgiseeq_close, + .ndo_start_xmit = sgiseeq_start_xmit, + .ndo_tx_timeout = timeout, + .ndo_set_multicast_list = sgiseeq_set_multicast, + .ndo_set_mac_address = sgiseeq_set_mac_address, + .ndo_change_mtu = eth_change_mtu, + .ndo_validate_addr = eth_validate_addr, +}; + +static int __devinit sgiseeq_probe(struct platform_device *pdev) +{ + struct sgiseeq_platform_data *pd = pdev->dev.platform_data; + struct hpc3_regs *hpcregs = pd->hpc; + struct sgiseeq_init_block *sr; + unsigned int irq = pd->irq; + struct sgiseeq_private *sp; + struct net_device *dev; + int err; + + dev = alloc_etherdev(sizeof (struct sgiseeq_private)); + if (!dev) { + printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n"); + err = -ENOMEM; + goto err_out; + } + + platform_set_drvdata(pdev, dev); + sp = netdev_priv(dev); + + /* Make private data page aligned */ + sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings), + &sp->srings_dma, GFP_KERNEL); + if (!sr) { + printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n"); + err = -ENOMEM; + goto err_out_free_dev; + } + sp->srings = sr; + sp->rx_desc = sp->srings->rxvector; + sp->tx_desc = sp->srings->txvector; + + /* A couple calculations now, saves many cycles later. */ + setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS); + setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS); + + memcpy(dev->dev_addr, pd->mac, ETH_ALEN); + +#ifdef DEBUG + gpriv = sp; + gdev = dev; +#endif + sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0]; + sp->hregs = &hpcregs->ethregs; + sp->name = sgiseeqstr; + sp->mode = SEEQ_RCMD_RBCAST; + + /* Setup PIO and DMA transfer timing */ + sp->hregs->pconfig = 0x161; + sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | + HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; + + /* Setup PIO and DMA transfer timing */ + sp->hregs->pconfig = 0x161; + sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | + HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; + + /* Reset the chip. */ + hpc3_eth_reset(sp->hregs); + + sp->is_edlc = !(sp->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->netdev_ops = &sgiseeq_netdev_ops; + dev->watchdog_timeo = (200 * HZ) / 1000; + dev->irq = irq; + + if (register_netdev(dev)) { + printk(KERN_ERR "Sgiseeq: Cannot register net device, " + "aborting.\n"); + err = -ENODEV; + goto err_out_free_page; + } + + printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr); + + return 0; + +err_out_free_page: + free_page((unsigned long) sp->srings); +err_out_free_dev: + free_netdev(dev); + +err_out: + return err; +} + +static int __exit sgiseeq_remove(struct platform_device *pdev) +{ + struct net_device *dev = platform_get_drvdata(pdev); + struct sgiseeq_private *sp = netdev_priv(dev); + + unregister_netdev(dev); + dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings, + sp->srings_dma); + free_netdev(dev); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver sgiseeq_driver = { + .probe = sgiseeq_probe, + .remove = __exit_p(sgiseeq_remove), + .driver = { + .name = "sgiseeq", + .owner = THIS_MODULE, + } +}; + +static int __init sgiseeq_module_init(void) +{ + if (platform_driver_register(&sgiseeq_driver)) { + printk(KERN_ERR "Driver registration failed\n"); + return -ENODEV; + } + + return 0; +} + +static void __exit sgiseeq_module_exit(void) +{ + platform_driver_unregister(&sgiseeq_driver); +} + +module_init(sgiseeq_module_init); +module_exit(sgiseeq_module_exit); + +MODULE_DESCRIPTION("SGI Seeq 8003 driver"); +MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:sgiseeq"); |