--- /dev/null
+/*
+ * 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/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 (!ether_addr_equal(rd->skb->data + 6, dev->dev_addr)) {
+ 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 {
+ 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_rx_mode = 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 sgiseeq_probe(struct platform_device *pdev)
+{
+ struct sgiseeq_platform_data *pd = dev_get_platdata(&pdev->dev);
+ 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) {
+ 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;
+ spin_lock_init(&sp->tx_lock);
+
+ /* 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);
+
+ return 0;
+}
+
+static struct platform_driver sgiseeq_driver = {
+ .probe = sgiseeq_probe,
+ .remove = __exit_p(sgiseeq_remove),
+ .driver = {
+ .name = "sgiseeq",
+ }
+};
+
+module_platform_driver(sgiseeq_driver);
+
+MODULE_DESCRIPTION("SGI Seeq 8003 driver");
+MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sgiseeq");
Code Review / kvmfornfv.git / blobdiff