drivers/net/ethernet/seeq/sgiseeq.c

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This source file includes following definitions.
dma_sync_desc_cpu
dma_sync_desc_dev
hpc3_eth_reset
reset_hpc3_and_seeq
seeq_go
__sgiseeq_set_mac_address
sgiseeq_set_mac_address
seeq_init_ring
seeq_purge_ring
sgiseeq_dump_rings
init_seeq
record_rx_errors
rx_maybe_restart
sgiseeq_rx
tx_maybe_reset_collisions
kick_tx
sgiseeq_tx
sgiseeq_interrupt
sgiseeq_open
sgiseeq_close
sgiseeq_reset
sgiseeq_start_xmit
timeout
sgiseeq_set_multicast
setup_tx_ring
setup_rx_ring
sgiseeq_probe
sgiseeq_remove
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.
   4  *
   5  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
   6  */
   7 
   8 #undef DEBUG
   9 
  10 #include <linux/dma-mapping.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/errno.h>
  15 #include <linux/types.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/string.h>
  18 #include <linux/delay.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/skbuff.h>
  23 
  24 #include <asm/sgi/hpc3.h>
  25 #include <asm/sgi/ip22.h>
  26 #include <asm/sgi/seeq.h>
  27 
  28 #include "sgiseeq.h"
  29 
  30 static char *sgiseeqstr = "SGI Seeq8003";
  31 
  32 /*
  33  * If you want speed, you do something silly, it always has worked for me.  So,
  34  * with that in mind, I've decided to make this driver look completely like a
  35  * stupid Lance from a driver architecture perspective.  Only difference is that
  36  * here our "ring buffer" looks and acts like a real Lance one does but is
  37  * laid out like how the HPC DMA and the Seeq want it to.  You'd be surprised
  38  * how a stupid idea like this can pay off in performance, not to mention
  39  * making this driver 2,000 times easier to write. ;-)
  40  */
  41 
  42 /* Tune these if we tend to run out often etc. */
  43 #define SEEQ_RX_BUFFERS  16
  44 #define SEEQ_TX_BUFFERS  16
  45 
  46 #define PKT_BUF_SZ       1584
  47 
  48 #define NEXT_RX(i)  (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
  49 #define NEXT_TX(i)  (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
  50 #define PREV_RX(i)  (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
  51 #define PREV_TX(i)  (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
  52 
  53 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
  54                             sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
  55                             sp->tx_old - sp->tx_new - 1)
  56 
  57 #define VIRT_TO_DMA(sp, v) ((sp)->srings_dma +                                 \
  58                                   (dma_addr_t)((unsigned long)(v) -            \
  59                                                (unsigned long)((sp)->rx_desc)))
  60 
  61 /* Copy frames shorter than rx_copybreak, otherwise pass on up in
  62  * a full sized sk_buff.  Value of 100 stolen from tulip.c (!alpha).
  63  */
  64 static int rx_copybreak = 100;
  65 
  66 #define PAD_SIZE    (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))
  67 
  68 struct sgiseeq_rx_desc {
  69         volatile struct hpc_dma_desc rdma;
  70         u8 padding[PAD_SIZE];
  71         struct sk_buff *skb;
  72 };
  73 
  74 struct sgiseeq_tx_desc {
  75         volatile struct hpc_dma_desc tdma;
  76         u8 padding[PAD_SIZE];
  77         struct sk_buff *skb;
  78 };
  79 
  80 /*
  81  * Warning: This structure is laid out in a certain way because HPC dma
  82  *          descriptors must be 8-byte aligned.  So don't touch this without
  83  *          some care.
  84  */
  85 struct sgiseeq_init_block { /* Note the name ;-) */
  86         struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
  87         struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
  88 };
  89 
  90 struct sgiseeq_private {
  91         struct sgiseeq_init_block *srings;
  92         dma_addr_t srings_dma;
  93 
  94         /* Ptrs to the descriptors in uncached space. */
  95         struct sgiseeq_rx_desc *rx_desc;
  96         struct sgiseeq_tx_desc *tx_desc;
  97 
  98         char *name;
  99         struct hpc3_ethregs *hregs;
 100         struct sgiseeq_regs *sregs;
 101 
 102         /* Ring entry counters. */
 103         unsigned int rx_new, tx_new;
 104         unsigned int rx_old, tx_old;
 105 
 106         int is_edlc;
 107         unsigned char control;
 108         unsigned char mode;
 109 
 110         spinlock_t tx_lock;
 111 };
 112 
 113 static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr)
 114 {
 115         dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
 116                        DMA_FROM_DEVICE);
 117 }
 118 
 119 static inline void dma_sync_desc_dev(struct net_device *dev, void *addr)
 120 {
 121         dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
 122                        DMA_TO_DEVICE);
 123 }
 124 
 125 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
 126 {
 127         hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
 128         udelay(20);
 129         hregs->reset = 0;
 130 }
 131 
 132 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
 133                                        struct sgiseeq_regs *sregs)
 134 {
 135         hregs->rx_ctrl = hregs->tx_ctrl = 0;
 136         hpc3_eth_reset(hregs);
 137 }
 138 
 139 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
 140                        SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
 141 
 142 static inline void seeq_go(struct sgiseeq_private *sp,
 143                            struct hpc3_ethregs *hregs,
 144                            struct sgiseeq_regs *sregs)
 145 {
 146         sregs->rstat = sp->mode | RSTAT_GO_BITS;
 147         hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
 148 }
 149 
 150 static inline void __sgiseeq_set_mac_address(struct net_device *dev)
 151 {
 152         struct sgiseeq_private *sp = netdev_priv(dev);
 153         struct sgiseeq_regs *sregs = sp->sregs;
 154         int i;
 155 
 156         sregs->tstat = SEEQ_TCMD_RB0;
 157         for (i = 0; i < 6; i++)
 158                 sregs->rw.eth_addr[i] = dev->dev_addr[i];
 159 }
 160 
 161 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
 162 {
 163         struct sgiseeq_private *sp = netdev_priv(dev);
 164         struct sockaddr *sa = addr;
 165 
 166         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 167 
 168         spin_lock_irq(&sp->tx_lock);
 169         __sgiseeq_set_mac_address(dev);
 170         spin_unlock_irq(&sp->tx_lock);
 171 
 172         return 0;
 173 }
 174 
 175 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
 176 #define RCNTCFG_INIT  (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
 177 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
 178 
 179 static int seeq_init_ring(struct net_device *dev)
 180 {
 181         struct sgiseeq_private *sp = netdev_priv(dev);
 182         int i;
 183 
 184         netif_stop_queue(dev);
 185         sp->rx_new = sp->tx_new = 0;
 186         sp->rx_old = sp->tx_old = 0;
 187 
 188         __sgiseeq_set_mac_address(dev);
 189 
 190         /* Setup tx ring. */
 191         for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
 192                 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
 193                 dma_sync_desc_dev(dev, &sp->tx_desc[i]);
 194         }
 195 
 196         /* And now the rx ring. */
 197         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 198                 if (!sp->rx_desc[i].skb) {
 199                         dma_addr_t dma_addr;
 200                         struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
 201 
 202                         if (skb == NULL)
 203                                 return -ENOMEM;
 204                         skb_reserve(skb, 2);
 205                         dma_addr = dma_map_single(dev->dev.parent,
 206                                                   skb->data - 2,
 207                                                   PKT_BUF_SZ, DMA_FROM_DEVICE);
 208                         sp->rx_desc[i].skb = skb;
 209                         sp->rx_desc[i].rdma.pbuf = dma_addr;
 210                 }
 211                 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
 212                 dma_sync_desc_dev(dev, &sp->rx_desc[i]);
 213         }
 214         sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
 215         dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]);
 216         return 0;
 217 }
 218 
 219 static void seeq_purge_ring(struct net_device *dev)
 220 {
 221         struct sgiseeq_private *sp = netdev_priv(dev);
 222         int i;
 223 
 224         /* clear tx ring. */
 225         for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
 226                 if (sp->tx_desc[i].skb) {
 227                         dev_kfree_skb(sp->tx_desc[i].skb);
 228                         sp->tx_desc[i].skb = NULL;
 229                 }
 230         }
 231 
 232         /* And now the rx ring. */
 233         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 234                 if (sp->rx_desc[i].skb) {
 235                         dev_kfree_skb(sp->rx_desc[i].skb);
 236                         sp->rx_desc[i].skb = NULL;
 237                 }
 238         }
 239 }
 240 
 241 #ifdef DEBUG
 242 static struct sgiseeq_private *gpriv;
 243 static struct net_device *gdev;
 244 
 245 static void sgiseeq_dump_rings(void)
 246 {
 247         static int once;
 248         struct sgiseeq_rx_desc *r = gpriv->rx_desc;
 249         struct sgiseeq_tx_desc *t = gpriv->tx_desc;
 250         struct hpc3_ethregs *hregs = gpriv->hregs;
 251         int i;
 252 
 253         if (once)
 254                 return;
 255         once++;
 256         printk("RING DUMP:\n");
 257         for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
 258                 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
 259                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 260                        r[i].rdma.pnext);
 261                 i += 1;
 262                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 263                        i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
 264                        r[i].rdma.pnext);
 265         }
 266         for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
 267                 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
 268                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 269                        t[i].tdma.pnext);
 270                 i += 1;
 271                 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
 272                        i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
 273                        t[i].tdma.pnext);
 274         }
 275         printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
 276                gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
 277         printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
 278                hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
 279         printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
 280                hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
 281 }
 282 #endif
 283 
 284 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
 285 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
 286 
 287 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
 288                      struct sgiseeq_regs *sregs)
 289 {
 290         struct hpc3_ethregs *hregs = sp->hregs;
 291         int err;
 292 
 293         reset_hpc3_and_seeq(hregs, sregs);
 294         err = seeq_init_ring(dev);
 295         if (err)
 296                 return err;
 297 
 298         /* Setup to field the proper interrupt types. */
 299         if (sp->is_edlc) {
 300                 sregs->tstat = TSTAT_INIT_EDLC;
 301                 sregs->rw.wregs.control = sp->control;
 302                 sregs->rw.wregs.frame_gap = 0;
 303         } else {
 304                 sregs->tstat = TSTAT_INIT_SEEQ;
 305         }
 306 
 307         hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc);
 308         hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc);
 309 
 310         seeq_go(sp, hregs, sregs);
 311         return 0;
 312 }
 313 
 314 static void record_rx_errors(struct net_device *dev, unsigned char status)
 315 {
 316         if (status & SEEQ_RSTAT_OVERF ||
 317             status & SEEQ_RSTAT_SFRAME)
 318                 dev->stats.rx_over_errors++;
 319         if (status & SEEQ_RSTAT_CERROR)
 320                 dev->stats.rx_crc_errors++;
 321         if (status & SEEQ_RSTAT_DERROR)
 322                 dev->stats.rx_frame_errors++;
 323         if (status & SEEQ_RSTAT_REOF)
 324                 dev->stats.rx_errors++;
 325 }
 326 
 327 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
 328                                     struct hpc3_ethregs *hregs,
 329                                     struct sgiseeq_regs *sregs)
 330 {
 331         if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
 332                 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new);
 333                 seeq_go(sp, hregs, sregs);
 334         }
 335 }
 336 
 337 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
 338                               struct hpc3_ethregs *hregs,
 339                               struct sgiseeq_regs *sregs)
 340 {
 341         struct sgiseeq_rx_desc *rd;
 342         struct sk_buff *skb = NULL;
 343         struct sk_buff *newskb;
 344         unsigned char pkt_status;
 345         int len = 0;
 346         unsigned int orig_end = PREV_RX(sp->rx_new);
 347 
 348         /* Service every received packet. */
 349         rd = &sp->rx_desc[sp->rx_new];
 350         dma_sync_desc_cpu(dev, rd);
 351         while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {
 352                 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
 353                 dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,
 354                                  PKT_BUF_SZ, DMA_FROM_DEVICE);
 355                 pkt_status = rd->skb->data[len];
 356                 if (pkt_status & SEEQ_RSTAT_FIG) {
 357                         /* Packet is OK. */
 358                         /* We don't want to receive our own packets */
 359                         if (!ether_addr_equal(rd->skb->data + 6, dev->dev_addr)) {
 360                                 if (len > rx_copybreak) {
 361                                         skb = rd->skb;
 362                                         newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
 363                                         if (!newskb) {
 364                                                 newskb = skb;
 365                                                 skb = NULL;
 366                                                 goto memory_squeeze;
 367                                         }
 368                                         skb_reserve(newskb, 2);
 369                                 } else {
 370                                         skb = netdev_alloc_skb_ip_align(dev, len);
 371                                         if (skb)
 372                                                 skb_copy_to_linear_data(skb, rd->skb->data, len);
 373 
 374                                         newskb = rd->skb;
 375                                 }
 376 memory_squeeze:
 377                                 if (skb) {
 378                                         skb_put(skb, len);
 379                                         skb->protocol = eth_type_trans(skb, dev);
 380                                         netif_rx(skb);
 381                                         dev->stats.rx_packets++;
 382                                         dev->stats.rx_bytes += len;
 383                                 } else {
 384                                         dev->stats.rx_dropped++;
 385                                 }
 386                         } else {
 387                                 /* Silently drop my own packets */
 388                                 newskb = rd->skb;
 389                         }
 390                 } else {
 391                         record_rx_errors(dev, pkt_status);
 392                         newskb = rd->skb;
 393                 }
 394                 rd->skb = newskb;
 395                 rd->rdma.pbuf = dma_map_single(dev->dev.parent,
 396                                                newskb->data - 2,
 397                                                PKT_BUF_SZ, DMA_FROM_DEVICE);
 398 
 399                 /* Return the entry to the ring pool. */
 400                 rd->rdma.cntinfo = RCNTINFO_INIT;
 401                 sp->rx_new = NEXT_RX(sp->rx_new);
 402                 dma_sync_desc_dev(dev, rd);
 403                 rd = &sp->rx_desc[sp->rx_new];
 404                 dma_sync_desc_cpu(dev, rd);
 405         }
 406         dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]);
 407         sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
 408         dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]);
 409         dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
 410         sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
 411         dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
 412         rx_maybe_restart(sp, hregs, sregs);
 413 }
 414 
 415 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
 416                                              struct sgiseeq_regs *sregs)
 417 {
 418         if (sp->is_edlc) {
 419                 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
 420                 sregs->rw.wregs.control = sp->control;
 421         }
 422 }
 423 
 424 static inline void kick_tx(struct net_device *dev,
 425                            struct sgiseeq_private *sp,
 426                            struct hpc3_ethregs *hregs)
 427 {
 428         struct sgiseeq_tx_desc *td;
 429         int i = sp->tx_old;
 430 
 431         /* If the HPC aint doin nothin, and there are more packets
 432          * with ETXD cleared and XIU set we must make very certain
 433          * that we restart the HPC else we risk locking up the
 434          * adapter.  The following code is only safe iff the HPCDMA
 435          * is not active!
 436          */
 437         td = &sp->tx_desc[i];
 438         dma_sync_desc_cpu(dev, td);
 439         while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
 440               (HPCDMA_XIU | HPCDMA_ETXD)) {
 441                 i = NEXT_TX(i);
 442                 td = &sp->tx_desc[i];
 443                 dma_sync_desc_cpu(dev, td);
 444         }
 445         if (td->tdma.cntinfo & HPCDMA_XIU) {
 446                 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
 447                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 448         }
 449 }
 450 
 451 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
 452                               struct hpc3_ethregs *hregs,
 453                               struct sgiseeq_regs *sregs)
 454 {
 455         struct sgiseeq_tx_desc *td;
 456         unsigned long status = hregs->tx_ctrl;
 457         int j;
 458 
 459         tx_maybe_reset_collisions(sp, sregs);
 460 
 461         if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
 462                 /* Oops, HPC detected some sort of error. */
 463                 if (status & SEEQ_TSTAT_R16)
 464                         dev->stats.tx_aborted_errors++;
 465                 if (status & SEEQ_TSTAT_UFLOW)
 466                         dev->stats.tx_fifo_errors++;
 467                 if (status & SEEQ_TSTAT_LCLS)
 468                         dev->stats.collisions++;
 469         }
 470 
 471         /* Ack 'em... */
 472         for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
 473                 td = &sp->tx_desc[j];
 474 
 475                 dma_sync_desc_cpu(dev, td);
 476                 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
 477                         break;
 478                 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
 479                         if (!(status & HPC3_ETXCTRL_ACTIVE)) {
 480                                 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
 481                                 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
 482                         }
 483                         break;
 484                 }
 485                 dev->stats.tx_packets++;
 486                 sp->tx_old = NEXT_TX(sp->tx_old);
 487                 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
 488                 td->tdma.cntinfo |= HPCDMA_EOX;
 489                 if (td->skb) {
 490                         dev_kfree_skb_any(td->skb);
 491                         td->skb = NULL;
 492                 }
 493                 dma_sync_desc_dev(dev, td);
 494         }
 495 }
 496 
 497 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id)
 498 {
 499         struct net_device *dev = (struct net_device *) dev_id;
 500         struct sgiseeq_private *sp = netdev_priv(dev);
 501         struct hpc3_ethregs *hregs = sp->hregs;
 502         struct sgiseeq_regs *sregs = sp->sregs;
 503 
 504         spin_lock(&sp->tx_lock);
 505 
 506         /* Ack the IRQ and set software state. */
 507         hregs->reset = HPC3_ERST_CLRIRQ;
 508 
 509         /* Always check for received packets. */
 510         sgiseeq_rx(dev, sp, hregs, sregs);
 511 
 512         /* Only check for tx acks if we have something queued. */
 513         if (sp->tx_old != sp->tx_new)
 514                 sgiseeq_tx(dev, sp, hregs, sregs);
 515 
 516         if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
 517                 netif_wake_queue(dev);
 518         }
 519         spin_unlock(&sp->tx_lock);
 520 
 521         return IRQ_HANDLED;
 522 }
 523 
 524 static int sgiseeq_open(struct net_device *dev)
 525 {
 526         struct sgiseeq_private *sp = netdev_priv(dev);
 527         struct sgiseeq_regs *sregs = sp->sregs;
 528         unsigned int irq = dev->irq;
 529         int err;
 530 
 531         if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
 532                 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
 533                 return -EAGAIN;
 534         }
 535 
 536         err = init_seeq(dev, sp, sregs);
 537         if (err)
 538                 goto out_free_irq;
 539 
 540         netif_start_queue(dev);
 541 
 542         return 0;
 543 
 544 out_free_irq:
 545         free_irq(irq, dev);
 546 
 547         return err;
 548 }
 549 
 550 static int sgiseeq_close(struct net_device *dev)
 551 {
 552         struct sgiseeq_private *sp = netdev_priv(dev);
 553         struct sgiseeq_regs *sregs = sp->sregs;
 554         unsigned int irq = dev->irq;
 555 
 556         netif_stop_queue(dev);
 557 
 558         /* Shutdown the Seeq. */
 559         reset_hpc3_and_seeq(sp->hregs, sregs);
 560         free_irq(irq, dev);
 561         seeq_purge_ring(dev);
 562 
 563         return 0;
 564 }
 565 
 566 static inline int sgiseeq_reset(struct net_device *dev)
 567 {
 568         struct sgiseeq_private *sp = netdev_priv(dev);
 569         struct sgiseeq_regs *sregs = sp->sregs;
 570         int err;
 571 
 572         err = init_seeq(dev, sp, sregs);
 573         if (err)
 574                 return err;
 575 
 576         netif_trans_update(dev); /* prevent tx timeout */
 577         netif_wake_queue(dev);
 578 
 579         return 0;
 580 }
 581 
 582 static netdev_tx_t
 583 sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
 584 {
 585         struct sgiseeq_private *sp = netdev_priv(dev);
 586         struct hpc3_ethregs *hregs = sp->hregs;
 587         unsigned long flags;
 588         struct sgiseeq_tx_desc *td;
 589         int len, entry;
 590 
 591         spin_lock_irqsave(&sp->tx_lock, flags);
 592 
 593         /* Setup... */
 594         len = skb->len;
 595         if (len < ETH_ZLEN) {
 596                 if (skb_padto(skb, ETH_ZLEN)) {
 597                         spin_unlock_irqrestore(&sp->tx_lock, flags);
 598                         return NETDEV_TX_OK;
 599                 }
 600                 len = ETH_ZLEN;
 601         }
 602 
 603         dev->stats.tx_bytes += len;
 604         entry = sp->tx_new;
 605         td = &sp->tx_desc[entry];
 606         dma_sync_desc_cpu(dev, td);
 607 
 608         /* Create entry.  There are so many races with adding a new
 609          * descriptor to the chain:
 610          * 1) Assume that the HPC is off processing a DMA chain while
 611          *    we are changing all of the following.
 612          * 2) Do no allow the HPC to look at a new descriptor until
 613          *    we have completely set up it's state.  This means, do
 614          *    not clear HPCDMA_EOX in the current last descritptor
 615          *    until the one we are adding looks consistent and could
 616          *    be processes right now.
 617          * 3) The tx interrupt code must notice when we've added a new
 618          *    entry and the HPC got to the end of the chain before we
 619          *    added this new entry and restarted it.
 620          */
 621         td->skb = skb;
 622         td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data,
 623                                        len, DMA_TO_DEVICE);
 624         td->tdma.cntinfo = (len & HPCDMA_BCNT) |
 625                            HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
 626         dma_sync_desc_dev(dev, td);
 627         if (sp->tx_old != sp->tx_new) {
 628                 struct sgiseeq_tx_desc *backend;
 629 
 630                 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
 631                 dma_sync_desc_cpu(dev, backend);
 632                 backend->tdma.cntinfo &= ~HPCDMA_EOX;
 633                 dma_sync_desc_dev(dev, backend);
 634         }
 635         sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
 636 
 637         /* Maybe kick the HPC back into motion. */
 638         if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
 639                 kick_tx(dev, sp, hregs);
 640 
 641         if (!TX_BUFFS_AVAIL(sp))
 642                 netif_stop_queue(dev);
 643         spin_unlock_irqrestore(&sp->tx_lock, flags);
 644 
 645         return NETDEV_TX_OK;
 646 }
 647 
 648 static void timeout(struct net_device *dev)
 649 {
 650         printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
 651         sgiseeq_reset(dev);
 652 
 653         netif_trans_update(dev); /* prevent tx timeout */
 654         netif_wake_queue(dev);
 655 }
 656 
 657 static void sgiseeq_set_multicast(struct net_device *dev)
 658 {
 659         struct sgiseeq_private *sp = netdev_priv(dev);
 660         unsigned char oldmode = sp->mode;
 661 
 662         if(dev->flags & IFF_PROMISC)
 663                 sp->mode = SEEQ_RCMD_RANY;
 664         else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
 665                 sp->mode = SEEQ_RCMD_RBMCAST;
 666         else
 667                 sp->mode = SEEQ_RCMD_RBCAST;
 668 
 669         /* XXX I know this sucks, but is there a better way to reprogram
 670          * XXX the receiver? At least, this shouldn't happen too often.
 671          */
 672 
 673         if (oldmode != sp->mode)
 674                 sgiseeq_reset(dev);
 675 }
 676 
 677 static inline void setup_tx_ring(struct net_device *dev,
 678                                  struct sgiseeq_tx_desc *buf,
 679                                  int nbufs)
 680 {
 681         struct sgiseeq_private *sp = netdev_priv(dev);
 682         int i = 0;
 683 
 684         while (i < (nbufs - 1)) {
 685                 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
 686                 buf[i].tdma.pbuf = 0;
 687                 dma_sync_desc_dev(dev, &buf[i]);
 688                 i++;
 689         }
 690         buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf);
 691         dma_sync_desc_dev(dev, &buf[i]);
 692 }
 693 
 694 static inline void setup_rx_ring(struct net_device *dev,
 695                                  struct sgiseeq_rx_desc *buf,
 696                                  int nbufs)
 697 {
 698         struct sgiseeq_private *sp = netdev_priv(dev);
 699         int i = 0;
 700 
 701         while (i < (nbufs - 1)) {
 702                 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
 703                 buf[i].rdma.pbuf = 0;
 704                 dma_sync_desc_dev(dev, &buf[i]);
 705                 i++;
 706         }
 707         buf[i].rdma.pbuf = 0;
 708         buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf);
 709         dma_sync_desc_dev(dev, &buf[i]);
 710 }
 711 
 712 static const struct net_device_ops sgiseeq_netdev_ops = {
 713         .ndo_open               = sgiseeq_open,
 714         .ndo_stop               = sgiseeq_close,
 715         .ndo_start_xmit         = sgiseeq_start_xmit,
 716         .ndo_tx_timeout         = timeout,
 717         .ndo_set_rx_mode        = sgiseeq_set_multicast,
 718         .ndo_set_mac_address    = sgiseeq_set_mac_address,
 719         .ndo_validate_addr      = eth_validate_addr,
 720 };
 721 
 722 static int sgiseeq_probe(struct platform_device *pdev)
 723 {
 724         struct sgiseeq_platform_data *pd = dev_get_platdata(&pdev->dev);
 725         struct hpc3_regs *hpcregs = pd->hpc;
 726         struct sgiseeq_init_block *sr;
 727         unsigned int irq = pd->irq;
 728         struct sgiseeq_private *sp;
 729         struct net_device *dev;
 730         int err;
 731 
 732         dev = alloc_etherdev(sizeof (struct sgiseeq_private));
 733         if (!dev) {
 734                 err = -ENOMEM;
 735                 goto err_out;
 736         }
 737 
 738         platform_set_drvdata(pdev, dev);
 739         SET_NETDEV_DEV(dev, &pdev->dev);
 740         sp = netdev_priv(dev);
 741 
 742         /* Make private data page aligned */
 743         sr = dma_alloc_attrs(&pdev->dev, sizeof(*sp->srings), &sp->srings_dma,
 744                              GFP_KERNEL, DMA_ATTR_NON_CONSISTENT);
 745         if (!sr) {
 746                 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
 747                 err = -ENOMEM;
 748                 goto err_out_free_dev;
 749         }
 750         sp->srings = sr;
 751         sp->rx_desc = sp->srings->rxvector;
 752         sp->tx_desc = sp->srings->txvector;
 753         spin_lock_init(&sp->tx_lock);
 754 
 755         /* A couple calculations now, saves many cycles later. */
 756         setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS);
 757         setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS);
 758 
 759         memcpy(dev->dev_addr, pd->mac, ETH_ALEN);
 760 
 761 #ifdef DEBUG
 762         gpriv = sp;
 763         gdev = dev;
 764 #endif
 765         sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
 766         sp->hregs = &hpcregs->ethregs;
 767         sp->name = sgiseeqstr;
 768         sp->mode = SEEQ_RCMD_RBCAST;
 769 
 770         /* Setup PIO and DMA transfer timing */
 771         sp->hregs->pconfig = 0x161;
 772         sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
 773                              HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
 774 
 775         /* Setup PIO and DMA transfer timing */
 776         sp->hregs->pconfig = 0x161;
 777         sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
 778                              HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
 779 
 780         /* Reset the chip. */
 781         hpc3_eth_reset(sp->hregs);
 782 
 783         sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
 784         if (sp->is_edlc)
 785                 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
 786                               SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
 787                               SEEQ_CTRL_ENCARR;
 788 
 789         dev->netdev_ops         = &sgiseeq_netdev_ops;
 790         dev->watchdog_timeo     = (200 * HZ) / 1000;
 791         dev->irq                = irq;
 792 
 793         if (register_netdev(dev)) {
 794                 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
 795                        "aborting.\n");
 796                 err = -ENODEV;
 797                 goto err_out_free_attrs;
 798         }
 799 
 800         printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr);
 801 
 802         return 0;
 803 
 804 err_out_free_attrs:
 805         dma_free_attrs(&pdev->dev, sizeof(*sp->srings), sp->srings,
 806                        sp->srings_dma, DMA_ATTR_NON_CONSISTENT);
 807 err_out_free_dev:
 808         free_netdev(dev);
 809 
 810 err_out:
 811         return err;
 812 }
 813 
 814 static int sgiseeq_remove(struct platform_device *pdev)
 815 {
 816         struct net_device *dev = platform_get_drvdata(pdev);
 817         struct sgiseeq_private *sp = netdev_priv(dev);
 818 
 819         unregister_netdev(dev);
 820         dma_free_attrs(&pdev->dev, sizeof(*sp->srings), sp->srings,
 821                        sp->srings_dma, DMA_ATTR_NON_CONSISTENT);
 822         free_netdev(dev);
 823 
 824         return 0;
 825 }
 826 
 827 static struct platform_driver sgiseeq_driver = {
 828         .probe  = sgiseeq_probe,
 829         .remove = sgiseeq_remove,
 830         .driver = {
 831                 .name   = "sgiseeq",
 832         }
 833 };
 834 
 835 module_platform_driver(sgiseeq_driver);
 836 
 837 MODULE_DESCRIPTION("SGI Seeq 8003 driver");
 838 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
 839 MODULE_LICENSE("GPL");
 840 MODULE_ALIAS("platform:sgiseeq");
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root/drivers/net/ethernet/seeq/sgiseeq.c

DEFINITIONS
