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path: root/drivers/net/myri_sbus.c
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Diffstat (limited to 'drivers/net/myri_sbus.c')
-rw-r--r--drivers/net/myri_sbus.c1174
1 files changed, 1174 insertions, 0 deletions
diff --git a/drivers/net/myri_sbus.c b/drivers/net/myri_sbus.c
new file mode 100644
index 000000000000..aad5494c83cf
--- /dev/null
+++ b/drivers/net/myri_sbus.c
@@ -0,0 +1,1174 @@
+/* myri_sbus.h: MyriCOM MyriNET SBUS card driver.
+ *
+ * Copyright (C) 1996, 1999 David S. Miller (davem@redhat.com)
+ */
+
+static char version[] =
+ "myri_sbus.c:v1.9 12/Sep/99 David S. Miller (davem@redhat.com)\n";
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+
+#include <net/dst.h>
+#include <net/arp.h>
+#include <net/sock.h>
+#include <net/ipv6.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/byteorder.h>
+#include <asm/idprom.h>
+#include <asm/sbus.h>
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/auxio.h>
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/checksum.h>
+
+#include "myri_sbus.h"
+#include "myri_code.h"
+
+/* #define DEBUG_DETECT */
+/* #define DEBUG_IRQ */
+/* #define DEBUG_TRANSMIT */
+/* #define DEBUG_RECEIVE */
+/* #define DEBUG_HEADER */
+
+#ifdef DEBUG_DETECT
+#define DET(x) printk x
+#else
+#define DET(x)
+#endif
+
+#ifdef DEBUG_IRQ
+#define DIRQ(x) printk x
+#else
+#define DIRQ(x)
+#endif
+
+#ifdef DEBUG_TRANSMIT
+#define DTX(x) printk x
+#else
+#define DTX(x)
+#endif
+
+#ifdef DEBUG_RECEIVE
+#define DRX(x) printk x
+#else
+#define DRX(x)
+#endif
+
+#ifdef DEBUG_HEADER
+#define DHDR(x) printk x
+#else
+#define DHDR(x)
+#endif
+
+#ifdef MODULE
+static struct myri_eth *root_myri_dev;
+#endif
+
+static void myri_reset_off(void __iomem *lp, void __iomem *cregs)
+{
+ /* Clear IRQ mask. */
+ sbus_writel(0, lp + LANAI_EIMASK);
+
+ /* Turn RESET function off. */
+ sbus_writel(CONTROL_ROFF, cregs + MYRICTRL_CTRL);
+}
+
+static void myri_reset_on(void __iomem *cregs)
+{
+ /* Enable RESET function. */
+ sbus_writel(CONTROL_RON, cregs + MYRICTRL_CTRL);
+
+ /* Disable IRQ's. */
+ sbus_writel(CONTROL_DIRQ, cregs + MYRICTRL_CTRL);
+}
+
+static void myri_disable_irq(void __iomem *lp, void __iomem *cregs)
+{
+ sbus_writel(CONTROL_DIRQ, cregs + MYRICTRL_CTRL);
+ sbus_writel(0, lp + LANAI_EIMASK);
+ sbus_writel(ISTAT_HOST, lp + LANAI_ISTAT);
+}
+
+static void myri_enable_irq(void __iomem *lp, void __iomem *cregs)
+{
+ sbus_writel(CONTROL_EIRQ, cregs + MYRICTRL_CTRL);
+ sbus_writel(ISTAT_HOST, lp + LANAI_EIMASK);
+}
+
+static inline void bang_the_chip(struct myri_eth *mp)
+{
+ struct myri_shmem __iomem *shmem = mp->shmem;
+ void __iomem *cregs = mp->cregs;
+
+ sbus_writel(1, &shmem->send);
+ sbus_writel(CONTROL_WON, cregs + MYRICTRL_CTRL);
+}
+
+static int myri_do_handshake(struct myri_eth *mp)
+{
+ struct myri_shmem __iomem *shmem = mp->shmem;
+ void __iomem *cregs = mp->cregs;
+ struct myri_channel __iomem *chan = &shmem->channel;
+ int tick = 0;
+
+ DET(("myri_do_handshake: "));
+ if (sbus_readl(&chan->state) == STATE_READY) {
+ DET(("Already STATE_READY, failed.\n"));
+ return -1; /* We're hosed... */
+ }
+
+ myri_disable_irq(mp->lregs, cregs);
+
+ while (tick++ <= 25) {
+ u32 softstate;
+
+ /* Wake it up. */
+ DET(("shakedown, CONTROL_WON, "));
+ sbus_writel(1, &shmem->shakedown);
+ sbus_writel(CONTROL_WON, cregs + MYRICTRL_CTRL);
+
+ softstate = sbus_readl(&chan->state);
+ DET(("chanstate[%08x] ", softstate));
+ if (softstate == STATE_READY) {
+ DET(("wakeup successful, "));
+ break;
+ }
+
+ if (softstate != STATE_WFN) {
+ DET(("not WFN setting that, "));
+ sbus_writel(STATE_WFN, &chan->state);
+ }
+
+ udelay(20);
+ }
+
+ myri_enable_irq(mp->lregs, cregs);
+
+ if (tick > 25) {
+ DET(("25 ticks we lose, failure.\n"));
+ return -1;
+ }
+ DET(("success\n"));
+ return 0;
+}
+
+static int myri_load_lanai(struct myri_eth *mp)
+{
+ struct net_device *dev = mp->dev;
+ struct myri_shmem __iomem *shmem = mp->shmem;
+ void __iomem *rptr;
+ int i;
+
+ myri_disable_irq(mp->lregs, mp->cregs);
+ myri_reset_on(mp->cregs);
+
+ rptr = mp->lanai;
+ for (i = 0; i < mp->eeprom.ramsz; i++)
+ sbus_writeb(0, rptr + i);
+
+ if (mp->eeprom.cpuvers >= CPUVERS_3_0)
+ sbus_writel(mp->eeprom.cval, mp->lregs + LANAI_CVAL);
+
+ /* Load executable code. */
+ for (i = 0; i < sizeof(lanai4_code); i++)
+ sbus_writeb(lanai4_code[i], rptr + (lanai4_code_off * 2) + i);
+
+ /* Load data segment. */
+ for (i = 0; i < sizeof(lanai4_data); i++)
+ sbus_writeb(lanai4_data[i], rptr + (lanai4_data_off * 2) + i);
+
+ /* Set device address. */
+ sbus_writeb(0, &shmem->addr[0]);
+ sbus_writeb(0, &shmem->addr[1]);
+ for (i = 0; i < 6; i++)
+ sbus_writeb(dev->dev_addr[i],
+ &shmem->addr[i + 2]);
+
+ /* Set SBUS bursts and interrupt mask. */
+ sbus_writel(((mp->myri_bursts & 0xf8) >> 3), &shmem->burst);
+ sbus_writel(SHMEM_IMASK_RX, &shmem->imask);
+
+ /* Release the LANAI. */
+ myri_disable_irq(mp->lregs, mp->cregs);
+ myri_reset_off(mp->lregs, mp->cregs);
+ myri_disable_irq(mp->lregs, mp->cregs);
+
+ /* Wait for the reset to complete. */
+ for (i = 0; i < 5000; i++) {
+ if (sbus_readl(&shmem->channel.state) != STATE_READY)
+ break;
+ else
+ udelay(10);
+ }
+
+ if (i == 5000)
+ printk(KERN_ERR "myricom: Chip would not reset after firmware load.\n");
+
+ i = myri_do_handshake(mp);
+ if (i)
+ printk(KERN_ERR "myricom: Handshake with LANAI failed.\n");
+
+ if (mp->eeprom.cpuvers == CPUVERS_4_0)
+ sbus_writel(0, mp->lregs + LANAI_VERS);
+
+ return i;
+}
+
+static void myri_clean_rings(struct myri_eth *mp)
+{
+ struct sendq __iomem *sq = mp->sq;
+ struct recvq __iomem *rq = mp->rq;
+ int i;
+
+ sbus_writel(0, &rq->tail);
+ sbus_writel(0, &rq->head);
+ for (i = 0; i < (RX_RING_SIZE+1); i++) {
+ if (mp->rx_skbs[i] != NULL) {
+ struct myri_rxd __iomem *rxd = &rq->myri_rxd[i];
+ u32 dma_addr;
+
+ dma_addr = sbus_readl(&rxd->myri_scatters[0].addr);
+ sbus_unmap_single(mp->myri_sdev, dma_addr, RX_ALLOC_SIZE, SBUS_DMA_FROMDEVICE);
+ dev_kfree_skb(mp->rx_skbs[i]);
+ mp->rx_skbs[i] = NULL;
+ }
+ }
+
+ mp->tx_old = 0;
+ sbus_writel(0, &sq->tail);
+ sbus_writel(0, &sq->head);
+ for (i = 0; i < TX_RING_SIZE; i++) {
+ if (mp->tx_skbs[i] != NULL) {
+ struct sk_buff *skb = mp->tx_skbs[i];
+ struct myri_txd __iomem *txd = &sq->myri_txd[i];
+ u32 dma_addr;
+
+ dma_addr = sbus_readl(&txd->myri_gathers[0].addr);
+ sbus_unmap_single(mp->myri_sdev, dma_addr, (skb->len + 3) & ~3, SBUS_DMA_TODEVICE);
+ dev_kfree_skb(mp->tx_skbs[i]);
+ mp->tx_skbs[i] = NULL;
+ }
+ }
+}
+
+static void myri_init_rings(struct myri_eth *mp, int from_irq)
+{
+ struct recvq __iomem *rq = mp->rq;
+ struct myri_rxd __iomem *rxd = &rq->myri_rxd[0];
+ struct net_device *dev = mp->dev;
+ int gfp_flags = GFP_KERNEL;
+ int i;
+
+ if (from_irq || in_interrupt())
+ gfp_flags = GFP_ATOMIC;
+
+ myri_clean_rings(mp);
+ for (i = 0; i < RX_RING_SIZE; i++) {
+ struct sk_buff *skb = myri_alloc_skb(RX_ALLOC_SIZE, gfp_flags);
+ u32 dma_addr;
+
+ if (!skb)
+ continue;
+ mp->rx_skbs[i] = skb;
+ skb->dev = dev;
+ skb_put(skb, RX_ALLOC_SIZE);
+
+ dma_addr = sbus_map_single(mp->myri_sdev, skb->data, RX_ALLOC_SIZE, SBUS_DMA_FROMDEVICE);
+ sbus_writel(dma_addr, &rxd[i].myri_scatters[0].addr);
+ sbus_writel(RX_ALLOC_SIZE, &rxd[i].myri_scatters[0].len);
+ sbus_writel(i, &rxd[i].ctx);
+ sbus_writel(1, &rxd[i].num_sg);
+ }
+ sbus_writel(0, &rq->head);
+ sbus_writel(RX_RING_SIZE, &rq->tail);
+}
+
+static int myri_init(struct myri_eth *mp, int from_irq)
+{
+ myri_init_rings(mp, from_irq);
+ return 0;
+}
+
+static void myri_is_not_so_happy(struct myri_eth *mp)
+{
+}
+
+#ifdef DEBUG_HEADER
+static void dump_ehdr(struct ethhdr *ehdr)
+{
+ printk("ehdr[h_dst(%02x:%02x:%02x:%02x:%02x:%02x)"
+ "h_source(%02x:%02x:%02x:%02x:%02x:%02x)h_proto(%04x)]\n",
+ ehdr->h_dest[0], ehdr->h_dest[1], ehdr->h_dest[2],
+ ehdr->h_dest[3], ehdr->h_dest[4], ehdr->h_dest[4],
+ ehdr->h_source[0], ehdr->h_source[1], ehdr->h_source[2],
+ ehdr->h_source[3], ehdr->h_source[4], ehdr->h_source[4],
+ ehdr->h_proto);
+}
+
+static void dump_ehdr_and_myripad(unsigned char *stuff)
+{
+ struct ethhdr *ehdr = (struct ethhdr *) (stuff + 2);
+
+ printk("pad[%02x:%02x]", stuff[0], stuff[1]);
+ printk("ehdr[h_dst(%02x:%02x:%02x:%02x:%02x:%02x)"
+ "h_source(%02x:%02x:%02x:%02x:%02x:%02x)h_proto(%04x)]\n",
+ ehdr->h_dest[0], ehdr->h_dest[1], ehdr->h_dest[2],
+ ehdr->h_dest[3], ehdr->h_dest[4], ehdr->h_dest[4],
+ ehdr->h_source[0], ehdr->h_source[1], ehdr->h_source[2],
+ ehdr->h_source[3], ehdr->h_source[4], ehdr->h_source[4],
+ ehdr->h_proto);
+}
+#endif
+
+static void myri_tx(struct myri_eth *mp, struct net_device *dev)
+{
+ struct sendq __iomem *sq= mp->sq;
+ int entry = mp->tx_old;
+ int limit = sbus_readl(&sq->head);
+
+ DTX(("entry[%d] limit[%d] ", entry, limit));
+ if (entry == limit)
+ return;
+ while (entry != limit) {
+ struct sk_buff *skb = mp->tx_skbs[entry];
+ u32 dma_addr;
+
+ DTX(("SKB[%d] ", entry));
+ dma_addr = sbus_readl(&sq->myri_txd[entry].myri_gathers[0].addr);
+ sbus_unmap_single(mp->myri_sdev, dma_addr, skb->len, SBUS_DMA_TODEVICE);
+ dev_kfree_skb(skb);
+ mp->tx_skbs[entry] = NULL;
+ mp->enet_stats.tx_packets++;
+ entry = NEXT_TX(entry);
+ }
+ mp->tx_old = entry;
+}
+
+/* Determine the packet's protocol ID. The rule here is that we
+ * assume 802.3 if the type field is short enough to be a length.
+ * This is normal practice and works for any 'now in use' protocol.
+ */
+static unsigned short myri_type_trans(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ethhdr *eth;
+ unsigned char *rawp;
+
+ skb->mac.raw = (((unsigned char *)skb->data) + MYRI_PAD_LEN);
+ skb_pull(skb, dev->hard_header_len);
+ eth = eth_hdr(skb);
+
+#ifdef DEBUG_HEADER
+ DHDR(("myri_type_trans: "));
+ dump_ehdr(eth);
+#endif
+ if (*eth->h_dest & 1) {
+ if (memcmp(eth->h_dest, dev->broadcast, ETH_ALEN)==0)
+ skb->pkt_type = PACKET_BROADCAST;
+ else
+ skb->pkt_type = PACKET_MULTICAST;
+ } else if (dev->flags & (IFF_PROMISC|IFF_ALLMULTI)) {
+ if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN))
+ skb->pkt_type = PACKET_OTHERHOST;
+ }
+
+ if (ntohs(eth->h_proto) >= 1536)
+ return eth->h_proto;
+
+ rawp = skb->data;
+
+ /* This is a magic hack to spot IPX packets. Older Novell breaks
+ * the protocol design and runs IPX over 802.3 without an 802.2 LLC
+ * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
+ * won't work for fault tolerant netware but does for the rest.
+ */
+ if (*(unsigned short *)rawp == 0xFFFF)
+ return htons(ETH_P_802_3);
+
+ /* Real 802.2 LLC */
+ return htons(ETH_P_802_2);
+}
+
+static void myri_rx(struct myri_eth *mp, struct net_device *dev)
+{
+ struct recvq __iomem *rq = mp->rq;
+ struct recvq __iomem *rqa = mp->rqack;
+ int entry = sbus_readl(&rqa->head);
+ int limit = sbus_readl(&rqa->tail);
+ int drops;
+
+ DRX(("entry[%d] limit[%d] ", entry, limit));
+ if (entry == limit)
+ return;
+ drops = 0;
+ DRX(("\n"));
+ while (entry != limit) {
+ struct myri_rxd __iomem *rxdack = &rqa->myri_rxd[entry];
+ u32 csum = sbus_readl(&rxdack->csum);
+ int len = sbus_readl(&rxdack->myri_scatters[0].len);
+ int index = sbus_readl(&rxdack->ctx);
+ struct myri_rxd __iomem *rxd = &rq->myri_rxd[sbus_readl(&rq->tail)];
+ struct sk_buff *skb = mp->rx_skbs[index];
+
+ /* Ack it. */
+ sbus_writel(NEXT_RX(entry), &rqa->head);
+
+ /* Check for errors. */
+ DRX(("rxd[%d]: %p len[%d] csum[%08x] ", entry, rxd, len, csum));
+ sbus_dma_sync_single_for_cpu(mp->myri_sdev,
+ sbus_readl(&rxd->myri_scatters[0].addr),
+ RX_ALLOC_SIZE, SBUS_DMA_FROMDEVICE);
+ if (len < (ETH_HLEN + MYRI_PAD_LEN) || (skb->data[0] != MYRI_PAD_LEN)) {
+ DRX(("ERROR["));
+ mp->enet_stats.rx_errors++;
+ if (len < (ETH_HLEN + MYRI_PAD_LEN)) {
+ DRX(("BAD_LENGTH] "));
+ mp->enet_stats.rx_length_errors++;
+ } else {
+ DRX(("NO_PADDING] "));
+ mp->enet_stats.rx_frame_errors++;
+ }
+
+ /* Return it to the LANAI. */
+ drop_it:
+ drops++;
+ DRX(("DROP "));
+ mp->enet_stats.rx_dropped++;
+ sbus_dma_sync_single_for_device(mp->myri_sdev,
+ sbus_readl(&rxd->myri_scatters[0].addr),
+ RX_ALLOC_SIZE,
+ SBUS_DMA_FROMDEVICE);
+ sbus_writel(RX_ALLOC_SIZE, &rxd->myri_scatters[0].len);
+ sbus_writel(index, &rxd->ctx);
+ sbus_writel(1, &rxd->num_sg);
+ sbus_writel(NEXT_RX(sbus_readl(&rq->tail)), &rq->tail);
+ goto next;
+ }
+
+ DRX(("len[%d] ", len));
+ if (len > RX_COPY_THRESHOLD) {
+ struct sk_buff *new_skb;
+ u32 dma_addr;
+
+ DRX(("BIGBUFF "));
+ new_skb = myri_alloc_skb(RX_ALLOC_SIZE, GFP_ATOMIC);
+ if (new_skb == NULL) {
+ DRX(("skb_alloc(FAILED) "));
+ goto drop_it;
+ }
+ sbus_unmap_single(mp->myri_sdev,
+ sbus_readl(&rxd->myri_scatters[0].addr),
+ RX_ALLOC_SIZE,
+ SBUS_DMA_FROMDEVICE);
+ mp->rx_skbs[index] = new_skb;
+ new_skb->dev = dev;
+ skb_put(new_skb, RX_ALLOC_SIZE);
+ dma_addr = sbus_map_single(mp->myri_sdev,
+ new_skb->data,
+ RX_ALLOC_SIZE,
+ SBUS_DMA_FROMDEVICE);
+ sbus_writel(dma_addr, &rxd->myri_scatters[0].addr);
+ sbus_writel(RX_ALLOC_SIZE, &rxd->myri_scatters[0].len);
+ sbus_writel(index, &rxd->ctx);
+ sbus_writel(1, &rxd->num_sg);
+ sbus_writel(NEXT_RX(sbus_readl(&rq->tail)), &rq->tail);
+
+ /* Trim the original skb for the netif. */
+ DRX(("trim(%d) ", len));
+ skb_trim(skb, len);
+ } else {
+ struct sk_buff *copy_skb = dev_alloc_skb(len);
+
+ DRX(("SMALLBUFF "));
+ if (copy_skb == NULL) {
+ DRX(("dev_alloc_skb(FAILED) "));
+ goto drop_it;
+ }
+ /* DMA sync already done above. */
+ copy_skb->dev = dev;
+ DRX(("resv_and_put "));
+ skb_put(copy_skb, len);
+ memcpy(copy_skb->data, skb->data, len);
+
+ /* Reuse original ring buffer. */
+ DRX(("reuse "));
+ sbus_dma_sync_single_for_device(mp->myri_sdev,
+ sbus_readl(&rxd->myri_scatters[0].addr),
+ RX_ALLOC_SIZE,
+ SBUS_DMA_FROMDEVICE);
+ sbus_writel(RX_ALLOC_SIZE, &rxd->myri_scatters[0].len);
+ sbus_writel(index, &rxd->ctx);
+ sbus_writel(1, &rxd->num_sg);
+ sbus_writel(NEXT_RX(sbus_readl(&rq->tail)), &rq->tail);
+
+ skb = copy_skb;
+ }
+
+ /* Just like the happy meal we get checksums from this card. */
+ skb->csum = csum;
+ skb->ip_summed = CHECKSUM_UNNECESSARY; /* XXX */
+
+ skb->protocol = myri_type_trans(skb, dev);
+ DRX(("prot[%04x] netif_rx ", skb->protocol));
+ netif_rx(skb);
+
+ dev->last_rx = jiffies;
+ mp->enet_stats.rx_packets++;
+ mp->enet_stats.rx_bytes += len;
+ next:
+ DRX(("NEXT\n"));
+ entry = NEXT_RX(entry);
+ }
+}
+
+static irqreturn_t myri_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct net_device *dev = (struct net_device *) dev_id;
+ struct myri_eth *mp = (struct myri_eth *) dev->priv;
+ void __iomem *lregs = mp->lregs;
+ struct myri_channel __iomem *chan = &mp->shmem->channel;
+ unsigned long flags;
+ u32 status;
+ int handled = 0;
+
+ spin_lock_irqsave(&mp->irq_lock, flags);
+
+ status = sbus_readl(lregs + LANAI_ISTAT);
+ DIRQ(("myri_interrupt: status[%08x] ", status));
+ if (status & ISTAT_HOST) {
+ u32 softstate;
+
+ handled = 1;
+ DIRQ(("IRQ_DISAB "));
+ myri_disable_irq(lregs, mp->cregs);
+ softstate = sbus_readl(&chan->state);
+ DIRQ(("state[%08x] ", softstate));
+ if (softstate != STATE_READY) {
+ DIRQ(("myri_not_so_happy "));
+ myri_is_not_so_happy(mp);
+ }
+ DIRQ(("\nmyri_rx: "));
+ myri_rx(mp, dev);
+ DIRQ(("\nistat=ISTAT_HOST "));
+ sbus_writel(ISTAT_HOST, lregs + LANAI_ISTAT);
+ DIRQ(("IRQ_ENAB "));
+ myri_enable_irq(lregs, mp->cregs);
+ }
+ DIRQ(("\n"));
+
+ spin_unlock_irqrestore(&mp->irq_lock, flags);
+
+ return IRQ_RETVAL(handled);
+}
+
+static int myri_open(struct net_device *dev)
+{
+ struct myri_eth *mp = (struct myri_eth *) dev->priv;
+
+ return myri_init(mp, in_interrupt());
+}
+
+static int myri_close(struct net_device *dev)
+{
+ struct myri_eth *mp = (struct myri_eth *) dev->priv;
+
+ myri_clean_rings(mp);
+ return 0;
+}
+
+static void myri_tx_timeout(struct net_device *dev)
+{
+ struct myri_eth *mp = (struct myri_eth *) dev->priv;
+
+ printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
+
+ mp->enet_stats.tx_errors++;
+ myri_init(mp, 0);
+ netif_wake_queue(dev);
+}
+
+static int myri_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct myri_eth *mp = (struct myri_eth *) dev->priv;
+ struct sendq __iomem *sq = mp->sq;
+ struct myri_txd __iomem *txd;
+ unsigned long flags;
+ unsigned int head, tail;
+ int len, entry;
+ u32 dma_addr;
+
+ DTX(("myri_start_xmit: "));
+
+ myri_tx(mp, dev);
+
+ netif_stop_queue(dev);
+
+ /* This is just to prevent multiple PIO reads for TX_BUFFS_AVAIL. */
+ head = sbus_readl(&sq->head);
+ tail = sbus_readl(&sq->tail);
+
+ if (!TX_BUFFS_AVAIL(head, tail)) {
+ DTX(("no buffs available, returning 1\n"));
+ return 1;
+ }
+
+ spin_lock_irqsave(&mp->irq_lock, flags);
+
+ DHDR(("xmit[skbdata(%p)]\n", skb->data));
+#ifdef DEBUG_HEADER
+ dump_ehdr_and_myripad(((unsigned char *) skb->data));
+#endif
+
+ /* XXX Maybe this can go as well. */
+ len = skb->len;
+ if (len & 3) {
+ DTX(("len&3 "));
+ len = (len + 4) & (~3);
+ }
+
+ entry = sbus_readl(&sq->tail);
+
+ txd = &sq->myri_txd[entry];
+ mp->tx_skbs[entry] = skb;
+
+ /* Must do this before we sbus map it. */
+ if (skb->data[MYRI_PAD_LEN] & 0x1) {
+ sbus_writew(0xffff, &txd->addr[0]);
+ sbus_writew(0xffff, &txd->addr[1]);
+ sbus_writew(0xffff, &txd->addr[2]);
+ sbus_writew(0xffff, &txd->addr[3]);
+ } else {
+ sbus_writew(0xffff, &txd->addr[0]);
+ sbus_writew((skb->data[0] << 8) | skb->data[1], &txd->addr[1]);
+ sbus_writew((skb->data[2] << 8) | skb->data[3], &txd->addr[2]);
+ sbus_writew((skb->data[4] << 8) | skb->data[5], &txd->addr[3]);
+ }
+
+ dma_addr = sbus_map_single(mp->myri_sdev, skb->data, len, SBUS_DMA_TODEVICE);
+ sbus_writel(dma_addr, &txd->myri_gathers[0].addr);
+ sbus_writel(len, &txd->myri_gathers[0].len);
+ sbus_writel(1, &txd->num_sg);
+ sbus_writel(KERNEL_CHANNEL, &txd->chan);
+ sbus_writel(len, &txd->len);
+ sbus_writel((u32)-1, &txd->csum_off);
+ sbus_writel(0, &txd->csum_field);
+
+ sbus_writel(NEXT_TX(entry), &sq->tail);
+ DTX(("BangTheChip "));
+ bang_the_chip(mp);
+
+ DTX(("tbusy=0, returning 0\n"));
+ netif_start_queue(dev);
+ spin_unlock_irqrestore(&mp->irq_lock, flags);
+ return 0;
+}
+
+/* Create the MyriNet MAC header for an arbitrary protocol layer
+ *
+ * saddr=NULL means use device source address
+ * daddr=NULL means leave destination address (eg unresolved arp)
+ */
+static int myri_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
+ void *daddr, void *saddr, unsigned len)
+{
+ struct ethhdr *eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
+ unsigned char *pad = (unsigned char *) skb_push(skb, MYRI_PAD_LEN);
+
+#ifdef DEBUG_HEADER
+ DHDR(("myri_header: pad[%02x,%02x] ", pad[0], pad[1]));
+ dump_ehdr(eth);
+#endif
+
+ /* Set the MyriNET padding identifier. */
+ pad[0] = MYRI_PAD_LEN;
+ pad[1] = 0xab;
+
+ /* Set the protocol type. For a packet of type ETH_P_802_3 we put the length
+ * in here instead. It is up to the 802.2 layer to carry protocol information.
+ */
+ if (type != ETH_P_802_3)
+ eth->h_proto = htons(type);
+ else
+ eth->h_proto = htons(len);
+
+ /* Set the source hardware address. */
+ if (saddr)
+ memcpy(eth->h_source, saddr, dev->addr_len);
+ else
+ memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
+
+ /* Anyway, the loopback-device should never use this function... */
+ if (dev->flags & IFF_LOOPBACK) {
+ int i;
+ for (i = 0; i < dev->addr_len; i++)
+ eth->h_dest[i] = 0;
+ return(dev->hard_header_len);
+ }
+
+ if (daddr) {
+ memcpy(eth->h_dest, daddr, dev->addr_len);
+ return dev->hard_header_len;
+ }
+ return -dev->hard_header_len;
+}
+
+/* Rebuild the MyriNet MAC header. This is called after an ARP
+ * (or in future other address resolution) has completed on this
+ * sk_buff. We now let ARP fill in the other fields.
+ */
+static int myri_rebuild_header(struct sk_buff *skb)
+{
+ unsigned char *pad = (unsigned char *) skb->data;
+ struct ethhdr *eth = (struct ethhdr *) (pad + MYRI_PAD_LEN);
+ struct net_device *dev = skb->dev;
+
+#ifdef DEBUG_HEADER
+ DHDR(("myri_rebuild_header: pad[%02x,%02x] ", pad[0], pad[1]));
+ dump_ehdr(eth);
+#endif
+
+ /* Refill MyriNet padding identifiers, this is just being anal. */
+ pad[0] = MYRI_PAD_LEN;
+ pad[1] = 0xab;
+
+ switch (eth->h_proto)
+ {
+#ifdef CONFIG_INET
+ case __constant_htons(ETH_P_IP):
+ return arp_find(eth->h_dest, skb);
+#endif
+
+ default:
+ printk(KERN_DEBUG
+ "%s: unable to resolve type %X addresses.\n",
+ dev->name, (int)eth->h_proto);
+
+ memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
+ return 0;
+ break;
+ }
+
+ return 0;
+}
+
+int myri_header_cache(struct neighbour *neigh, struct hh_cache *hh)
+{
+ unsigned short type = hh->hh_type;
+ unsigned char *pad;
+ struct ethhdr *eth;
+ struct net_device *dev = neigh->dev;
+
+ pad = ((unsigned char *) hh->hh_data) +
+ HH_DATA_OFF(sizeof(*eth) + MYRI_PAD_LEN);
+ eth = (struct ethhdr *) (pad + MYRI_PAD_LEN);
+
+ if (type == __constant_htons(ETH_P_802_3))
+ return -1;
+
+ /* Refill MyriNet padding identifiers, this is just being anal. */
+ pad[0] = MYRI_PAD_LEN;
+ pad[1] = 0xab;
+
+ eth->h_proto = type;
+ memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
+ memcpy(eth->h_dest, neigh->ha, dev->addr_len);
+ hh->hh_len = 16;
+ return 0;
+}
+
+
+/* Called by Address Resolution module to notify changes in address. */
+void myri_header_cache_update(struct hh_cache *hh, struct net_device *dev, unsigned char * haddr)
+{
+ memcpy(((u8*)hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
+ haddr, dev->addr_len);
+}
+
+static int myri_change_mtu(struct net_device *dev, int new_mtu)
+{
+ if ((new_mtu < (ETH_HLEN + MYRI_PAD_LEN)) || (new_mtu > MYRINET_MTU))
+ return -EINVAL;
+ dev->mtu = new_mtu;
+ return 0;
+}
+
+static struct net_device_stats *myri_get_stats(struct net_device *dev)
+{ return &(((struct myri_eth *)dev->priv)->enet_stats); }
+
+static void myri_set_multicast(struct net_device *dev)
+{
+ /* Do nothing, all MyriCOM nodes transmit multicast frames
+ * as broadcast packets...
+ */
+}
+
+static inline void set_boardid_from_idprom(struct myri_eth *mp, int num)
+{
+ mp->eeprom.id[0] = 0;
+ mp->eeprom.id[1] = idprom->id_machtype;
+ mp->eeprom.id[2] = (idprom->id_sernum >> 16) & 0xff;
+ mp->eeprom.id[3] = (idprom->id_sernum >> 8) & 0xff;
+ mp->eeprom.id[4] = (idprom->id_sernum >> 0) & 0xff;
+ mp->eeprom.id[5] = num;
+}
+
+static inline void determine_reg_space_size(struct myri_eth *mp)
+{
+ switch(mp->eeprom.cpuvers) {
+ case CPUVERS_2_3:
+ case CPUVERS_3_0:
+ case CPUVERS_3_1:
+ case CPUVERS_3_2:
+ mp->reg_size = (3 * 128 * 1024) + 4096;
+ break;
+
+ case CPUVERS_4_0:
+ case CPUVERS_4_1:
+ mp->reg_size = ((4096<<1) + mp->eeprom.ramsz);
+ break;
+
+ case CPUVERS_4_2:
+ case CPUVERS_5_0:
+ default:
+ printk("myricom: AIEEE weird cpu version %04x assuming pre4.0\n",
+ mp->eeprom.cpuvers);
+ mp->reg_size = (3 * 128 * 1024) + 4096;
+ };
+}
+
+#ifdef DEBUG_DETECT
+static void dump_eeprom(struct myri_eth *mp)
+{
+ printk("EEPROM: clockval[%08x] cpuvers[%04x] "
+ "id[%02x,%02x,%02x,%02x,%02x,%02x]\n",
+ mp->eeprom.cval, mp->eeprom.cpuvers,
+ mp->eeprom.id[0], mp->eeprom.id[1], mp->eeprom.id[2],
+ mp->eeprom.id[3], mp->eeprom.id[4], mp->eeprom.id[5]);
+ printk("EEPROM: ramsz[%08x]\n", mp->eeprom.ramsz);
+ printk("EEPROM: fvers[%02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x\n",
+ mp->eeprom.fvers[0], mp->eeprom.fvers[1], mp->eeprom.fvers[2],
+ mp->eeprom.fvers[3], mp->eeprom.fvers[4], mp->eeprom.fvers[5],
+ mp->eeprom.fvers[6], mp->eeprom.fvers[7]);
+ printk("EEPROM: %02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x\n",
+ mp->eeprom.fvers[8], mp->eeprom.fvers[9], mp->eeprom.fvers[10],
+ mp->eeprom.fvers[11], mp->eeprom.fvers[12], mp->eeprom.fvers[13],
+ mp->eeprom.fvers[14], mp->eeprom.fvers[15]);
+ printk("EEPROM: %02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x\n",
+ mp->eeprom.fvers[16], mp->eeprom.fvers[17], mp->eeprom.fvers[18],
+ mp->eeprom.fvers[19], mp->eeprom.fvers[20], mp->eeprom.fvers[21],
+ mp->eeprom.fvers[22], mp->eeprom.fvers[23]);
+ printk("EEPROM: %02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x]\n",
+ mp->eeprom.fvers[24], mp->eeprom.fvers[25], mp->eeprom.fvers[26],
+ mp->eeprom.fvers[27], mp->eeprom.fvers[28], mp->eeprom.fvers[29],
+ mp->eeprom.fvers[30], mp->eeprom.fvers[31]);
+ printk("EEPROM: mvers[%02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x\n",
+ mp->eeprom.mvers[0], mp->eeprom.mvers[1], mp->eeprom.mvers[2],
+ mp->eeprom.mvers[3], mp->eeprom.mvers[4], mp->eeprom.mvers[5],
+ mp->eeprom.mvers[6], mp->eeprom.mvers[7]);
+ printk("EEPROM: %02x,%02x,%02x,%02x,%02x,%02x,%02x,%02x]\n",
+ mp->eeprom.mvers[8], mp->eeprom.mvers[9], mp->eeprom.mvers[10],
+ mp->eeprom.mvers[11], mp->eeprom.mvers[12], mp->eeprom.mvers[13],
+ mp->eeprom.mvers[14], mp->eeprom.mvers[15]);
+ printk("EEPROM: dlval[%04x] brd_type[%04x] bus_type[%04x] prod_code[%04x]\n",
+ mp->eeprom.dlval, mp->eeprom.brd_type, mp->eeprom.bus_type,
+ mp->eeprom.prod_code);
+ printk("EEPROM: serial_num[%08x]\n", mp->eeprom.serial_num);
+}
+#endif
+
+static int __init myri_ether_init(struct sbus_dev *sdev, int num)
+{
+ static unsigned version_printed;
+ struct net_device *dev;
+ struct myri_eth *mp;
+ unsigned char prop_buf[32];
+ int i;
+
+ DET(("myri_ether_init(%p,%d):\n", sdev, num));
+ dev = alloc_etherdev(sizeof(struct myri_eth));
+
+ if (!dev)
+ return -ENOMEM;
+
+ if (version_printed++ == 0)
+ printk(version);
+
+ mp = (struct myri_eth *) dev->priv;
+ spin_lock_init(&mp->irq_lock);
+ mp->myri_sdev = sdev;
+
+ /* Clean out skb arrays. */
+ for (i = 0; i < (RX_RING_SIZE + 1); i++)
+ mp->rx_skbs[i] = NULL;
+
+ for (i = 0; i < TX_RING_SIZE; i++)
+ mp->tx_skbs[i] = NULL;
+
+ /* First check for EEPROM information. */
+ i = prom_getproperty(sdev->prom_node, "myrinet-eeprom-info",
+ (char *)&mp->eeprom, sizeof(struct myri_eeprom));
+ DET(("prom_getprop(myrinet-eeprom-info) returns %d\n", i));
+ if (i == 0 || i == -1) {
+ /* No eeprom property, must cook up the values ourselves. */
+ DET(("No EEPROM: "));
+ mp->eeprom.bus_type = BUS_TYPE_SBUS;
+ mp->eeprom.cpuvers = prom_getintdefault(sdev->prom_node,"cpu_version",0);
+ mp->eeprom.cval = prom_getintdefault(sdev->prom_node,"clock_value",0);
+ mp->eeprom.ramsz = prom_getintdefault(sdev->prom_node,"sram_size",0);
+ DET(("cpuvers[%d] cval[%d] ramsz[%d]\n", mp->eeprom.cpuvers,
+ mp->eeprom.cval, mp->eeprom.ramsz));
+ if (mp->eeprom.cpuvers == 0) {
+ DET(("EEPROM: cpuvers was zero, setting to %04x\n",CPUVERS_2_3));
+ mp->eeprom.cpuvers = CPUVERS_2_3;
+ }
+ if (mp->eeprom.cpuvers < CPUVERS_3_0) {
+ DET(("EEPROM: cpuvers < CPUVERS_3_0, clockval set to zero.\n"));
+ mp->eeprom.cval = 0;
+ }
+ if (mp->eeprom.ramsz == 0) {
+ DET(("EEPROM: ramsz == 0, setting to 128k\n"));
+ mp->eeprom.ramsz = (128 * 1024);
+ }
+ i = prom_getproperty(sdev->prom_node, "myrinet-board-id",
+ &prop_buf[0], 10);
+ DET(("EEPROM: prom_getprop(myrinet-board-id) returns %d\n", i));
+ if ((i != 0) && (i != -1))
+ memcpy(&mp->eeprom.id[0], &prop_buf[0], 6);
+ else
+ set_boardid_from_idprom(mp, num);
+ i = prom_getproperty(sdev->prom_node, "fpga_version",
+ &mp->eeprom.fvers[0], 32);
+ DET(("EEPROM: prom_getprop(fpga_version) returns %d\n", i));
+ if (i == 0 || i == -1)
+ memset(&mp->eeprom.fvers[0], 0, 32);
+
+ if (mp->eeprom.cpuvers == CPUVERS_4_1) {
+ DET(("EEPROM: cpuvers CPUVERS_4_1, "));
+ if (mp->eeprom.ramsz == (128 * 1024)) {
+ DET(("ramsize 128k, setting to 256k, "));
+ mp->eeprom.ramsz = (256 * 1024);
+ }
+ if ((mp->eeprom.cval==0x40414041)||(mp->eeprom.cval==0x90449044)){
+ DET(("changing cval from %08x to %08x ",
+ mp->eeprom.cval, 0x50e450e4));
+ mp->eeprom.cval = 0x50e450e4;
+ }
+ DET(("\n"));
+ }
+ }
+#ifdef DEBUG_DETECT
+ dump_eeprom(mp);
+#endif
+
+ for (i = 0; i < 6; i++)
+ dev->dev_addr[i] = mp->eeprom.id[i];
+
+ determine_reg_space_size(mp);
+
+ /* Map in the MyriCOM register/localram set. */
+ if (mp->eeprom.cpuvers < CPUVERS_4_0) {
+ /* XXX Makes no sense, if control reg is non-existant this
+ * XXX driver cannot function at all... maybe pre-4.0 is
+ * XXX only a valid version for PCI cards? Ask feldy...
+ */
+ DET(("Mapping regs for cpuvers < CPUVERS_4_0\n"));
+ mp->regs = sbus_ioremap(&sdev->resource[0], 0,
+ mp->reg_size, "MyriCOM Regs");
+ if (!mp->regs) {
+ printk("MyriCOM: Cannot map MyriCOM registers.\n");
+ goto err;
+ }
+ mp->lanai = mp->regs + (256 * 1024);
+ mp->lregs = mp->lanai + (0x10000 * 2);
+ } else {
+ DET(("Mapping regs for cpuvers >= CPUVERS_4_0\n"));
+ mp->cregs = sbus_ioremap(&sdev->resource[0], 0,
+ PAGE_SIZE, "MyriCOM Control Regs");
+ mp->lregs = sbus_ioremap(&sdev->resource[0], (256 * 1024),
+ PAGE_SIZE, "MyriCOM LANAI Regs");
+ mp->lanai =
+ sbus_ioremap(&sdev->resource[0], (512 * 1024),
+ mp->eeprom.ramsz, "MyriCOM SRAM");
+ }
+ DET(("Registers mapped: cregs[%p] lregs[%p] lanai[%p]\n",
+ mp->cregs, mp->lregs, mp->lanai));
+
+ if (mp->eeprom.cpuvers >= CPUVERS_4_0)
+ mp->shmem_base = 0xf000;
+ else
+ mp->shmem_base = 0x8000;
+
+ DET(("Shared memory base is %04x, ", mp->shmem_base));
+
+ mp->shmem = (struct myri_shmem __iomem *)
+ (mp->lanai + (mp->shmem_base * 2));
+ DET(("shmem mapped at %p\n", mp->shmem));
+
+ mp->rqack = &mp->shmem->channel.recvqa;
+ mp->rq = &mp->shmem->channel.recvq;
+ mp->sq = &mp->shmem->channel.sendq;
+
+ /* Reset the board. */
+ DET(("Resetting LANAI\n"));
+ myri_reset_off(mp->lregs, mp->cregs);
+ myri_reset_on(mp->cregs);
+
+ /* Turn IRQ's off. */
+ myri_disable_irq(mp->lregs, mp->cregs);
+
+ /* Reset once more. */
+ myri_reset_on(mp->cregs);
+
+ /* Get the supported DVMA burst sizes from our SBUS. */
+ mp->myri_bursts = prom_getintdefault(mp->myri_sdev->bus->prom_node,
+ "burst-sizes", 0x00);
+
+ if (!sbus_can_burst64(sdev))
+ mp->myri_bursts &= ~(DMA_BURST64);
+
+ DET(("MYRI bursts %02x\n", mp->myri_bursts));
+
+ /* Encode SBUS interrupt level in second control register. */
+ i = prom_getint(sdev->prom_node, "interrupts");
+ if (i == 0)
+ i = 4;
+ DET(("prom_getint(interrupts)==%d, irqlvl set to %04x\n",
+ i, (1 << i)));
+
+ sbus_writel((1 << i), mp->cregs + MYRICTRL_IRQLVL);
+
+ mp->dev = dev;
+ dev->open = &myri_open;
+ dev->stop = &myri_close;
+ dev->hard_start_xmit = &myri_start_xmit;
+ dev->tx_timeout = &myri_tx_timeout;
+ dev->watchdog_timeo = 5*HZ;
+ dev->get_stats = &myri_get_stats;
+ dev->set_multicast_list = &myri_set_multicast;
+ dev->irq = sdev->irqs[0];
+
+ /* Register interrupt handler now. */
+ DET(("Requesting MYRIcom IRQ line.\n"));
+ if (request_irq(dev->irq, &myri_interrupt,
+ SA_SHIRQ, "MyriCOM Ethernet", (void *) dev)) {
+ printk("MyriCOM: Cannot register interrupt handler.\n");
+ goto err;
+ }
+
+ dev->mtu = MYRINET_MTU;
+ dev->change_mtu = myri_change_mtu;
+ dev->hard_header = myri_header;
+ dev->rebuild_header = myri_rebuild_header;
+ dev->hard_header_len = (ETH_HLEN + MYRI_PAD_LEN);
+ dev->hard_header_cache = myri_header_cache;
+ dev->header_cache_update= myri_header_cache_update;
+
+ /* Load code onto the LANai. */
+ DET(("Loading LANAI firmware\n"));
+ myri_load_lanai(mp);
+
+ if (register_netdev(dev)) {
+ printk("MyriCOM: Cannot register device.\n");
+ goto err_free_irq;
+ }
+
+#ifdef MODULE
+ mp->next_module = root_myri_dev;
+ root_myri_dev = mp;
+#endif
+
+ printk("%s: MyriCOM MyriNET Ethernet ", dev->name);
+
+ for (i = 0; i < 6; i++)
+ printk("%2.2x%c", dev->dev_addr[i],
+ i == 5 ? ' ' : ':');
+ printk("\n");
+
+ return 0;
+
+err_free_irq:
+ free_irq(dev->irq, dev);
+err:
+ /* This will also free the co-allocated 'dev->priv' */
+ free_netdev(dev);
+ return -ENODEV;
+}
+
+static int __init myri_sbus_match(struct sbus_dev *sdev)
+{
+ char *name = sdev->prom_name;
+
+ if (!strcmp(name, "MYRICOM,mlanai") ||
+ !strcmp(name, "myri"))
+ return 1;
+
+ return 0;
+}
+
+static int __init myri_sbus_probe(void)
+{
+ struct sbus_bus *bus;
+ struct sbus_dev *sdev = NULL;
+ static int called;
+ int cards = 0, v;
+
+#ifdef MODULE
+ root_myri_dev = NULL;
+#endif
+
+ if (called)
+ return -ENODEV;
+ called++;
+
+ for_each_sbus(bus) {
+ for_each_sbusdev(sdev, bus) {
+ if (myri_sbus_match(sdev)) {
+ cards++;
+ DET(("Found myricom myrinet as %s\n", sdev->prom_name));
+ if ((v = myri_ether_init(sdev, (cards - 1))))
+ return v;
+ }
+ }
+ }
+ if (!cards)
+ return -ENODEV;
+ return 0;
+}
+
+static void __exit myri_sbus_cleanup(void)
+{
+#ifdef MODULE
+ while (root_myri_dev) {
+ struct myri_eth *next = root_myri_dev->next_module;
+
+ unregister_netdev(root_myri_dev->dev);
+ /* this will also free the co-allocated 'root_myri_dev' */
+ free_netdev(root_myri_dev->dev);
+ root_myri_dev = next;
+ }
+#endif /* MODULE */
+}
+
+module_init(myri_sbus_probe);
+module_exit(myri_sbus_cleanup);
+MODULE_LICENSE("GPL");