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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.
0004  *
0005  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
0006  */
0007 
0008 #undef DEBUG
0009 
0010 #include <linux/dma-mapping.h>
0011 #include <linux/kernel.h>
0012 #include <linux/module.h>
0013 #include <linux/slab.h>
0014 #include <linux/errno.h>
0015 #include <linux/types.h>
0016 #include <linux/interrupt.h>
0017 #include <linux/string.h>
0018 #include <linux/delay.h>
0019 #include <linux/netdevice.h>
0020 #include <linux/platform_device.h>
0021 #include <linux/etherdevice.h>
0022 #include <linux/skbuff.h>
0023 
0024 #include <asm/sgi/hpc3.h>
0025 #include <asm/sgi/ip22.h>
0026 #include <asm/sgi/seeq.h>
0027 
0028 #include "sgiseeq.h"
0029 
0030 static char *sgiseeqstr = "SGI Seeq8003";
0031 
0032 /*
0033  * If you want speed, you do something silly, it always has worked for me.  So,
0034  * with that in mind, I've decided to make this driver look completely like a
0035  * stupid Lance from a driver architecture perspective.  Only difference is that
0036  * here our "ring buffer" looks and acts like a real Lance one does but is
0037  * laid out like how the HPC DMA and the Seeq want it to.  You'd be surprised
0038  * how a stupid idea like this can pay off in performance, not to mention
0039  * making this driver 2,000 times easier to write. ;-)
0040  */
0041 
0042 /* Tune these if we tend to run out often etc. */
0043 #define SEEQ_RX_BUFFERS  16
0044 #define SEEQ_TX_BUFFERS  16
0045 
0046 #define PKT_BUF_SZ       1584
0047 
0048 #define NEXT_RX(i)  (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
0049 #define NEXT_TX(i)  (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
0050 #define PREV_RX(i)  (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
0051 #define PREV_TX(i)  (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
0052 
0053 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
0054                 sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
0055                 sp->tx_old - sp->tx_new - 1)
0056 
0057 #define VIRT_TO_DMA(sp, v) ((sp)->srings_dma +                                 \
0058                   (dma_addr_t)((unsigned long)(v) -            \
0059                            (unsigned long)((sp)->rx_desc)))
0060 
0061 /* Copy frames shorter than rx_copybreak, otherwise pass on up in
0062  * a full sized sk_buff.  Value of 100 stolen from tulip.c (!alpha).
0063  */
0064 static int rx_copybreak = 100;
0065 
0066 #define PAD_SIZE    (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))
0067 
0068 struct sgiseeq_rx_desc {
0069     volatile struct hpc_dma_desc rdma;
0070     u8 padding[PAD_SIZE];
0071     struct sk_buff *skb;
0072 };
0073 
0074 struct sgiseeq_tx_desc {
0075     volatile struct hpc_dma_desc tdma;
0076     u8 padding[PAD_SIZE];
0077     struct sk_buff *skb;
0078 };
0079 
0080 /*
0081  * Warning: This structure is laid out in a certain way because HPC dma
0082  *          descriptors must be 8-byte aligned.  So don't touch this without
0083  *          some care.
0084  */
0085 struct sgiseeq_init_block { /* Note the name ;-) */
0086     struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
0087     struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
0088 };
0089 
0090 struct sgiseeq_private {
0091     struct sgiseeq_init_block *srings;
0092     dma_addr_t srings_dma;
0093 
0094     /* Ptrs to the descriptors in uncached space. */
0095     struct sgiseeq_rx_desc *rx_desc;
0096     struct sgiseeq_tx_desc *tx_desc;
0097 
0098     char *name;
0099     struct hpc3_ethregs *hregs;
0100     struct sgiseeq_regs *sregs;
0101 
0102     /* Ring entry counters. */
0103     unsigned int rx_new, tx_new;
0104     unsigned int rx_old, tx_old;
0105 
0106     int is_edlc;
0107     unsigned char control;
0108     unsigned char mode;
0109 
0110     spinlock_t tx_lock;
0111 };
0112 
0113 static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr)
0114 {
0115     struct sgiseeq_private *sp = netdev_priv(dev);
0116 
0117     dma_sync_single_for_cpu(dev->dev.parent, VIRT_TO_DMA(sp, addr),
0118             sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL);
0119 }
0120 
0121 static inline void dma_sync_desc_dev(struct net_device *dev, void *addr)
0122 {
0123     struct sgiseeq_private *sp = netdev_priv(dev);
0124 
0125     dma_sync_single_for_device(dev->dev.parent, VIRT_TO_DMA(sp, addr),
0126             sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL);
0127 }
0128 
0129 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
0130 {
0131     hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
0132     udelay(20);
0133     hregs->reset = 0;
0134 }
0135 
0136 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
0137                        struct sgiseeq_regs *sregs)
0138 {
0139     hregs->rx_ctrl = hregs->tx_ctrl = 0;
0140     hpc3_eth_reset(hregs);
0141 }
0142 
0143 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
0144                SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
0145 
0146 static inline void seeq_go(struct sgiseeq_private *sp,
0147                struct hpc3_ethregs *hregs,
0148                struct sgiseeq_regs *sregs)
0149 {
0150     sregs->rstat = sp->mode | RSTAT_GO_BITS;
0151     hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
0152 }
0153 
0154 static inline void __sgiseeq_set_mac_address(struct net_device *dev)
0155 {
0156     struct sgiseeq_private *sp = netdev_priv(dev);
0157     struct sgiseeq_regs *sregs = sp->sregs;
0158     int i;
0159 
0160     sregs->tstat = SEEQ_TCMD_RB0;
0161     for (i = 0; i < 6; i++)
0162         sregs->rw.eth_addr[i] = dev->dev_addr[i];
0163 }
0164 
0165 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
0166 {
0167     struct sgiseeq_private *sp = netdev_priv(dev);
0168     struct sockaddr *sa = addr;
0169 
0170     eth_hw_addr_set(dev, sa->sa_data);
0171 
0172     spin_lock_irq(&sp->tx_lock);
0173     __sgiseeq_set_mac_address(dev);
0174     spin_unlock_irq(&sp->tx_lock);
0175 
0176     return 0;
0177 }
0178 
0179 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
0180 #define RCNTCFG_INIT  (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
0181 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
0182 
0183 static int seeq_init_ring(struct net_device *dev)
0184 {
0185     struct sgiseeq_private *sp = netdev_priv(dev);
0186     int i;
0187 
0188     netif_stop_queue(dev);
0189     sp->rx_new = sp->tx_new = 0;
0190     sp->rx_old = sp->tx_old = 0;
0191 
0192     __sgiseeq_set_mac_address(dev);
0193 
0194     /* Setup tx ring. */
0195     for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
0196         sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
0197         dma_sync_desc_dev(dev, &sp->tx_desc[i]);
0198     }
0199 
0200     /* And now the rx ring. */
0201     for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
0202         if (!sp->rx_desc[i].skb) {
0203             dma_addr_t dma_addr;
0204             struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
0205 
0206             if (skb == NULL)
0207                 return -ENOMEM;
0208             skb_reserve(skb, 2);
0209             dma_addr = dma_map_single(dev->dev.parent,
0210                           skb->data - 2,
0211                           PKT_BUF_SZ, DMA_FROM_DEVICE);
0212             sp->rx_desc[i].skb = skb;
0213             sp->rx_desc[i].rdma.pbuf = dma_addr;
0214         }
0215         sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
0216         dma_sync_desc_dev(dev, &sp->rx_desc[i]);
0217     }
0218     sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
0219     dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]);
0220     return 0;
0221 }
0222 
0223 static void seeq_purge_ring(struct net_device *dev)
0224 {
0225     struct sgiseeq_private *sp = netdev_priv(dev);
0226     int i;
0227 
0228     /* clear tx ring. */
0229     for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
0230         if (sp->tx_desc[i].skb) {
0231             dev_kfree_skb(sp->tx_desc[i].skb);
0232             sp->tx_desc[i].skb = NULL;
0233         }
0234     }
0235 
0236     /* And now the rx ring. */
0237     for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
0238         if (sp->rx_desc[i].skb) {
0239             dev_kfree_skb(sp->rx_desc[i].skb);
0240             sp->rx_desc[i].skb = NULL;
0241         }
0242     }
0243 }
0244 
0245 #ifdef DEBUG
0246 static struct sgiseeq_private *gpriv;
0247 static struct net_device *gdev;
0248 
0249 static void sgiseeq_dump_rings(void)
0250 {
0251     static int once;
0252     struct sgiseeq_rx_desc *r = gpriv->rx_desc;
0253     struct sgiseeq_tx_desc *t = gpriv->tx_desc;
0254     struct hpc3_ethregs *hregs = gpriv->hregs;
0255     int i;
0256 
0257     if (once)
0258         return;
0259     once++;
0260     printk("RING DUMP:\n");
0261     for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
0262         printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
0263                i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
0264                r[i].rdma.pnext);
0265         i += 1;
0266         printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
0267                i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
0268                r[i].rdma.pnext);
0269     }
0270     for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
0271         printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
0272                i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
0273                t[i].tdma.pnext);
0274         i += 1;
0275         printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
0276                i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
0277                t[i].tdma.pnext);
0278     }
0279     printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
0280            gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
0281     printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
0282            hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
0283     printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
0284            hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
0285 }
0286 #endif
0287 
0288 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
0289 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
0290 
0291 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
0292              struct sgiseeq_regs *sregs)
0293 {
0294     struct hpc3_ethregs *hregs = sp->hregs;
0295     int err;
0296 
0297     reset_hpc3_and_seeq(hregs, sregs);
0298     err = seeq_init_ring(dev);
0299     if (err)
0300         return err;
0301 
0302     /* Setup to field the proper interrupt types. */
0303     if (sp->is_edlc) {
0304         sregs->tstat = TSTAT_INIT_EDLC;
0305         sregs->rw.wregs.control = sp->control;
0306         sregs->rw.wregs.frame_gap = 0;
0307     } else {
0308         sregs->tstat = TSTAT_INIT_SEEQ;
0309     }
0310 
0311     hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc);
0312     hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc);
0313 
0314     seeq_go(sp, hregs, sregs);
0315     return 0;
0316 }
0317 
0318 static void record_rx_errors(struct net_device *dev, unsigned char status)
0319 {
0320     if (status & SEEQ_RSTAT_OVERF ||
0321         status & SEEQ_RSTAT_SFRAME)
0322         dev->stats.rx_over_errors++;
0323     if (status & SEEQ_RSTAT_CERROR)
0324         dev->stats.rx_crc_errors++;
0325     if (status & SEEQ_RSTAT_DERROR)
0326         dev->stats.rx_frame_errors++;
0327     if (status & SEEQ_RSTAT_REOF)
0328         dev->stats.rx_errors++;
0329 }
0330 
0331 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
0332                     struct hpc3_ethregs *hregs,
0333                     struct sgiseeq_regs *sregs)
0334 {
0335     if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
0336         hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new);
0337         seeq_go(sp, hregs, sregs);
0338     }
0339 }
0340 
0341 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
0342                   struct hpc3_ethregs *hregs,
0343                   struct sgiseeq_regs *sregs)
0344 {
0345     struct sgiseeq_rx_desc *rd;
0346     struct sk_buff *skb = NULL;
0347     struct sk_buff *newskb;
0348     unsigned char pkt_status;
0349     int len = 0;
0350     unsigned int orig_end = PREV_RX(sp->rx_new);
0351 
0352     /* Service every received packet. */
0353     rd = &sp->rx_desc[sp->rx_new];
0354     dma_sync_desc_cpu(dev, rd);
0355     while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {
0356         len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
0357         dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,
0358                  PKT_BUF_SZ, DMA_FROM_DEVICE);
0359         pkt_status = rd->skb->data[len];
0360         if (pkt_status & SEEQ_RSTAT_FIG) {
0361             /* Packet is OK. */
0362             /* We don't want to receive our own packets */
0363             if (!ether_addr_equal(rd->skb->data + 6, dev->dev_addr)) {
0364                 if (len > rx_copybreak) {
0365                     skb = rd->skb;
0366                     newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
0367                     if (!newskb) {
0368                         newskb = skb;
0369                         skb = NULL;
0370                         goto memory_squeeze;
0371                     }
0372                     skb_reserve(newskb, 2);
0373                 } else {
0374                     skb = netdev_alloc_skb_ip_align(dev, len);
0375                     if (skb)
0376                         skb_copy_to_linear_data(skb, rd->skb->data, len);
0377 
0378                     newskb = rd->skb;
0379                 }
0380 memory_squeeze:
0381                 if (skb) {
0382                     skb_put(skb, len);
0383                     skb->protocol = eth_type_trans(skb, dev);
0384                     netif_rx(skb);
0385                     dev->stats.rx_packets++;
0386                     dev->stats.rx_bytes += len;
0387                 } else {
0388                     dev->stats.rx_dropped++;
0389                 }
0390             } else {
0391                 /* Silently drop my own packets */
0392                 newskb = rd->skb;
0393             }
0394         } else {
0395             record_rx_errors(dev, pkt_status);
0396             newskb = rd->skb;
0397         }
0398         rd->skb = newskb;
0399         rd->rdma.pbuf = dma_map_single(dev->dev.parent,
0400                            newskb->data - 2,
0401                            PKT_BUF_SZ, DMA_FROM_DEVICE);
0402 
0403         /* Return the entry to the ring pool. */
0404         rd->rdma.cntinfo = RCNTINFO_INIT;
0405         sp->rx_new = NEXT_RX(sp->rx_new);
0406         dma_sync_desc_dev(dev, rd);
0407         rd = &sp->rx_desc[sp->rx_new];
0408         dma_sync_desc_cpu(dev, rd);
0409     }
0410     dma_sync_desc_dev(dev, rd);
0411 
0412     dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]);
0413     sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
0414     dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]);
0415     dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
0416     sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
0417     dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
0418     rx_maybe_restart(sp, hregs, sregs);
0419 }
0420 
0421 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
0422                          struct sgiseeq_regs *sregs)
0423 {
0424     if (sp->is_edlc) {
0425         sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
0426         sregs->rw.wregs.control = sp->control;
0427     }
0428 }
0429 
0430 static inline void kick_tx(struct net_device *dev,
0431                struct sgiseeq_private *sp,
0432                struct hpc3_ethregs *hregs)
0433 {
0434     struct sgiseeq_tx_desc *td;
0435     int i = sp->tx_old;
0436 
0437     /* If the HPC aint doin nothin, and there are more packets
0438      * with ETXD cleared and XIU set we must make very certain
0439      * that we restart the HPC else we risk locking up the
0440      * adapter.  The following code is only safe iff the HPCDMA
0441      * is not active!
0442      */
0443     td = &sp->tx_desc[i];
0444     dma_sync_desc_cpu(dev, td);
0445     while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
0446           (HPCDMA_XIU | HPCDMA_ETXD)) {
0447         i = NEXT_TX(i);
0448         td = &sp->tx_desc[i];
0449         dma_sync_desc_cpu(dev, td);
0450     }
0451     if (td->tdma.cntinfo & HPCDMA_XIU) {
0452         dma_sync_desc_dev(dev, td);
0453         hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
0454         hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
0455     }
0456 }
0457 
0458 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
0459                   struct hpc3_ethregs *hregs,
0460                   struct sgiseeq_regs *sregs)
0461 {
0462     struct sgiseeq_tx_desc *td;
0463     unsigned long status = hregs->tx_ctrl;
0464     int j;
0465 
0466     tx_maybe_reset_collisions(sp, sregs);
0467 
0468     if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
0469         /* Oops, HPC detected some sort of error. */
0470         if (status & SEEQ_TSTAT_R16)
0471             dev->stats.tx_aborted_errors++;
0472         if (status & SEEQ_TSTAT_UFLOW)
0473             dev->stats.tx_fifo_errors++;
0474         if (status & SEEQ_TSTAT_LCLS)
0475             dev->stats.collisions++;
0476     }
0477 
0478     /* Ack 'em... */
0479     for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
0480         td = &sp->tx_desc[j];
0481 
0482         dma_sync_desc_cpu(dev, td);
0483         if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
0484             break;
0485         if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
0486             dma_sync_desc_dev(dev, td);
0487             if (!(status & HPC3_ETXCTRL_ACTIVE)) {
0488                 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
0489                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
0490             }
0491             break;
0492         }
0493         dev->stats.tx_packets++;
0494         sp->tx_old = NEXT_TX(sp->tx_old);
0495         td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
0496         td->tdma.cntinfo |= HPCDMA_EOX;
0497         if (td->skb) {
0498             dev_kfree_skb_any(td->skb);
0499             td->skb = NULL;
0500         }
0501         dma_sync_desc_dev(dev, td);
0502     }
0503 }
0504 
0505 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id)
0506 {
0507     struct net_device *dev = (struct net_device *) dev_id;
0508     struct sgiseeq_private *sp = netdev_priv(dev);
0509     struct hpc3_ethregs *hregs = sp->hregs;
0510     struct sgiseeq_regs *sregs = sp->sregs;
0511 
0512     spin_lock(&sp->tx_lock);
0513 
0514     /* Ack the IRQ and set software state. */
0515     hregs->reset = HPC3_ERST_CLRIRQ;
0516 
0517     /* Always check for received packets. */
0518     sgiseeq_rx(dev, sp, hregs, sregs);
0519 
0520     /* Only check for tx acks if we have something queued. */
0521     if (sp->tx_old != sp->tx_new)
0522         sgiseeq_tx(dev, sp, hregs, sregs);
0523 
0524     if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
0525         netif_wake_queue(dev);
0526     }
0527     spin_unlock(&sp->tx_lock);
0528 
0529     return IRQ_HANDLED;
0530 }
0531 
0532 static int sgiseeq_open(struct net_device *dev)
0533 {
0534     struct sgiseeq_private *sp = netdev_priv(dev);
0535     struct sgiseeq_regs *sregs = sp->sregs;
0536     unsigned int irq = dev->irq;
0537     int err;
0538 
0539     if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
0540         printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
0541         return -EAGAIN;
0542     }
0543 
0544     err = init_seeq(dev, sp, sregs);
0545     if (err)
0546         goto out_free_irq;
0547 
0548     netif_start_queue(dev);
0549 
0550     return 0;
0551 
0552 out_free_irq:
0553     free_irq(irq, dev);
0554 
0555     return err;
0556 }
0557 
0558 static int sgiseeq_close(struct net_device *dev)
0559 {
0560     struct sgiseeq_private *sp = netdev_priv(dev);
0561     struct sgiseeq_regs *sregs = sp->sregs;
0562     unsigned int irq = dev->irq;
0563 
0564     netif_stop_queue(dev);
0565 
0566     /* Shutdown the Seeq. */
0567     reset_hpc3_and_seeq(sp->hregs, sregs);
0568     free_irq(irq, dev);
0569     seeq_purge_ring(dev);
0570 
0571     return 0;
0572 }
0573 
0574 static inline int sgiseeq_reset(struct net_device *dev)
0575 {
0576     struct sgiseeq_private *sp = netdev_priv(dev);
0577     struct sgiseeq_regs *sregs = sp->sregs;
0578     int err;
0579 
0580     err = init_seeq(dev, sp, sregs);
0581     if (err)
0582         return err;
0583 
0584     netif_trans_update(dev); /* prevent tx timeout */
0585     netif_wake_queue(dev);
0586 
0587     return 0;
0588 }
0589 
0590 static netdev_tx_t
0591 sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
0592 {
0593     struct sgiseeq_private *sp = netdev_priv(dev);
0594     struct hpc3_ethregs *hregs = sp->hregs;
0595     unsigned long flags;
0596     struct sgiseeq_tx_desc *td;
0597     int len, entry;
0598 
0599     spin_lock_irqsave(&sp->tx_lock, flags);
0600 
0601     /* Setup... */
0602     len = skb->len;
0603     if (len < ETH_ZLEN) {
0604         if (skb_padto(skb, ETH_ZLEN)) {
0605             spin_unlock_irqrestore(&sp->tx_lock, flags);
0606             return NETDEV_TX_OK;
0607         }
0608         len = ETH_ZLEN;
0609     }
0610 
0611     dev->stats.tx_bytes += len;
0612     entry = sp->tx_new;
0613     td = &sp->tx_desc[entry];
0614     dma_sync_desc_cpu(dev, td);
0615 
0616     /* Create entry.  There are so many races with adding a new
0617      * descriptor to the chain:
0618      * 1) Assume that the HPC is off processing a DMA chain while
0619      *    we are changing all of the following.
0620      * 2) Do no allow the HPC to look at a new descriptor until
0621      *    we have completely set up it's state.  This means, do
0622      *    not clear HPCDMA_EOX in the current last descritptor
0623      *    until the one we are adding looks consistent and could
0624      *    be processes right now.
0625      * 3) The tx interrupt code must notice when we've added a new
0626      *    entry and the HPC got to the end of the chain before we
0627      *    added this new entry and restarted it.
0628      */
0629     td->skb = skb;
0630     td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data,
0631                        len, DMA_TO_DEVICE);
0632     td->tdma.cntinfo = (len & HPCDMA_BCNT) |
0633                        HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
0634     dma_sync_desc_dev(dev, td);
0635     if (sp->tx_old != sp->tx_new) {
0636         struct sgiseeq_tx_desc *backend;
0637 
0638         backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
0639         dma_sync_desc_cpu(dev, backend);
0640         backend->tdma.cntinfo &= ~HPCDMA_EOX;
0641         dma_sync_desc_dev(dev, backend);
0642     }
0643     sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
0644 
0645     /* Maybe kick the HPC back into motion. */
0646     if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
0647         kick_tx(dev, sp, hregs);
0648 
0649     if (!TX_BUFFS_AVAIL(sp))
0650         netif_stop_queue(dev);
0651     spin_unlock_irqrestore(&sp->tx_lock, flags);
0652 
0653     return NETDEV_TX_OK;
0654 }
0655 
0656 static void timeout(struct net_device *dev, unsigned int txqueue)
0657 {
0658     printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
0659     sgiseeq_reset(dev);
0660 
0661     netif_trans_update(dev); /* prevent tx timeout */
0662     netif_wake_queue(dev);
0663 }
0664 
0665 static void sgiseeq_set_multicast(struct net_device *dev)
0666 {
0667     struct sgiseeq_private *sp = netdev_priv(dev);
0668     unsigned char oldmode = sp->mode;
0669 
0670     if(dev->flags & IFF_PROMISC)
0671         sp->mode = SEEQ_RCMD_RANY;
0672     else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
0673         sp->mode = SEEQ_RCMD_RBMCAST;
0674     else
0675         sp->mode = SEEQ_RCMD_RBCAST;
0676 
0677     /* XXX I know this sucks, but is there a better way to reprogram
0678      * XXX the receiver? At least, this shouldn't happen too often.
0679      */
0680 
0681     if (oldmode != sp->mode)
0682         sgiseeq_reset(dev);
0683 }
0684 
0685 static inline void setup_tx_ring(struct net_device *dev,
0686                  struct sgiseeq_tx_desc *buf,
0687                  int nbufs)
0688 {
0689     struct sgiseeq_private *sp = netdev_priv(dev);
0690     int i = 0;
0691 
0692     while (i < (nbufs - 1)) {
0693         buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
0694         buf[i].tdma.pbuf = 0;
0695         dma_sync_desc_dev(dev, &buf[i]);
0696         i++;
0697     }
0698     buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf);
0699     dma_sync_desc_dev(dev, &buf[i]);
0700 }
0701 
0702 static inline void setup_rx_ring(struct net_device *dev,
0703                  struct sgiseeq_rx_desc *buf,
0704                  int nbufs)
0705 {
0706     struct sgiseeq_private *sp = netdev_priv(dev);
0707     int i = 0;
0708 
0709     while (i < (nbufs - 1)) {
0710         buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
0711         buf[i].rdma.pbuf = 0;
0712         dma_sync_desc_dev(dev, &buf[i]);
0713         i++;
0714     }
0715     buf[i].rdma.pbuf = 0;
0716     buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf);
0717     dma_sync_desc_dev(dev, &buf[i]);
0718 }
0719 
0720 static const struct net_device_ops sgiseeq_netdev_ops = {
0721     .ndo_open       = sgiseeq_open,
0722     .ndo_stop       = sgiseeq_close,
0723     .ndo_start_xmit     = sgiseeq_start_xmit,
0724     .ndo_tx_timeout     = timeout,
0725     .ndo_set_rx_mode    = sgiseeq_set_multicast,
0726     .ndo_set_mac_address    = sgiseeq_set_mac_address,
0727     .ndo_validate_addr  = eth_validate_addr,
0728 };
0729 
0730 static int sgiseeq_probe(struct platform_device *pdev)
0731 {
0732     struct sgiseeq_platform_data *pd = dev_get_platdata(&pdev->dev);
0733     struct hpc3_regs *hpcregs = pd->hpc;
0734     struct sgiseeq_init_block *sr;
0735     unsigned int irq = pd->irq;
0736     struct sgiseeq_private *sp;
0737     struct net_device *dev;
0738     int err;
0739 
0740     dev = alloc_etherdev(sizeof (struct sgiseeq_private));
0741     if (!dev) {
0742         err = -ENOMEM;
0743         goto err_out;
0744     }
0745 
0746     platform_set_drvdata(pdev, dev);
0747     SET_NETDEV_DEV(dev, &pdev->dev);
0748     sp = netdev_priv(dev);
0749 
0750     /* Make private data page aligned */
0751     sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings),
0752             &sp->srings_dma, DMA_BIDIRECTIONAL, GFP_KERNEL);
0753     if (!sr) {
0754         printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
0755         err = -ENOMEM;
0756         goto err_out_free_dev;
0757     }
0758     sp->srings = sr;
0759     sp->rx_desc = sp->srings->rxvector;
0760     sp->tx_desc = sp->srings->txvector;
0761     spin_lock_init(&sp->tx_lock);
0762 
0763     /* A couple calculations now, saves many cycles later. */
0764     setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS);
0765     setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS);
0766 
0767     eth_hw_addr_set(dev, pd->mac);
0768 
0769 #ifdef DEBUG
0770     gpriv = sp;
0771     gdev = dev;
0772 #endif
0773     sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
0774     sp->hregs = &hpcregs->ethregs;
0775     sp->name = sgiseeqstr;
0776     sp->mode = SEEQ_RCMD_RBCAST;
0777 
0778     /* Setup PIO and DMA transfer timing */
0779     sp->hregs->pconfig = 0x161;
0780     sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
0781                  HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
0782 
0783     /* Setup PIO and DMA transfer timing */
0784     sp->hregs->pconfig = 0x161;
0785     sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
0786                  HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
0787 
0788     /* Reset the chip. */
0789     hpc3_eth_reset(sp->hregs);
0790 
0791     sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
0792     if (sp->is_edlc)
0793         sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
0794                   SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
0795                   SEEQ_CTRL_ENCARR;
0796 
0797     dev->netdev_ops     = &sgiseeq_netdev_ops;
0798     dev->watchdog_timeo = (200 * HZ) / 1000;
0799     dev->irq        = irq;
0800 
0801     if (register_netdev(dev)) {
0802         printk(KERN_ERR "Sgiseeq: Cannot register net device, "
0803                "aborting.\n");
0804         err = -ENODEV;
0805         goto err_out_free_attrs;
0806     }
0807 
0808     printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr);
0809 
0810     return 0;
0811 
0812 err_out_free_attrs:
0813     dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,
0814                sp->srings_dma, DMA_BIDIRECTIONAL);
0815 err_out_free_dev:
0816     free_netdev(dev);
0817 
0818 err_out:
0819     return err;
0820 }
0821 
0822 static int sgiseeq_remove(struct platform_device *pdev)
0823 {
0824     struct net_device *dev = platform_get_drvdata(pdev);
0825     struct sgiseeq_private *sp = netdev_priv(dev);
0826 
0827     unregister_netdev(dev);
0828     dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,
0829                sp->srings_dma, DMA_BIDIRECTIONAL);
0830     free_netdev(dev);
0831 
0832     return 0;
0833 }
0834 
0835 static struct platform_driver sgiseeq_driver = {
0836     .probe  = sgiseeq_probe,
0837     .remove = sgiseeq_remove,
0838     .driver = {
0839         .name   = "sgiseeq",
0840     }
0841 };
0842 
0843 module_platform_driver(sgiseeq_driver);
0844 
0845 MODULE_DESCRIPTION("SGI Seeq 8003 driver");
0846 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
0847 MODULE_LICENSE("GPL");
0848 MODULE_ALIAS("platform:sgiseeq");
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