drivers/net/fddi/defza.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*      FDDI network adapter driver for DEC FDDIcontroller 700/700-C devices.
   3  *
   4  *      Copyright (c) 2018  Maciej W. Rozycki
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  *
  11  *      References:
  12  *
  13  *      Dave Sawyer & Phil Weeks & Frank Itkowsky,
  14  *      "DEC FDDIcontroller 700 Port Specification",
  15  *      Revision 1.1, Digital Equipment Corporation
  16  */
  17
  18 /* ------------------------------------------------------------------------- */
  19 /* FZA configurable parameters.                                              */
  20
  21 /* The number of transmit ring descriptors; either 0 for 512 or 1 for 1024.  */
  22 #define FZA_RING_TX_MODE 0
  23
  24 /* The number of receive ring descriptors; from 2 up to 256.  */
  25 #define FZA_RING_RX_SIZE 256
  26
  27 /* End of FZA configurable parameters.  No need to change anything below.    */
  28 /* ------------------------------------------------------------------------- */
  29
  30 #include <linux/delay.h>
  31 #include <linux/device.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/init.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/io.h>
  36 #include <linux/ioport.h>
  37 #include <linux/kernel.h>
  38 #include <linux/list.h>
  39 #include <linux/module.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/fddidevice.h>
  42 #include <linux/sched.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/stat.h>
  46 #include <linux/tc.h>
  47 #include <linux/timer.h>
  48 #include <linux/types.h>
  49 #include <linux/wait.h>
  50
  51 #include <asm/barrier.h>
  52
  53 #include "defza.h"
  54
  55 #define DRV_NAME "defza"
  56 #define DRV_VERSION "v.1.1.4"
  57 #define DRV_RELDATE "Oct  6 2018"
  58
  59 static char version[] =
  60         DRV_NAME ": " DRV_VERSION "  " DRV_RELDATE "  Maciej W. Rozycki\n";
  61
  62 MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
  63 MODULE_DESCRIPTION("DEC FDDIcontroller 700 (DEFZA-xx) driver");
  64 MODULE_LICENSE("GPL");
  65
  66 static int loopback;
  67 module_param(loopback, int, 0644);
  68
  69 /* Ring Purger Multicast */
  70 static u8 hw_addr_purger[8] = { 0x09, 0x00, 0x2b, 0x02, 0x01, 0x05 };
  71 /* Directed Beacon Multicast */
  72 static u8 hw_addr_beacon[8] = { 0x01, 0x80, 0xc2, 0x00, 0x01, 0x00 };
  73
  74 /* Shorthands for MMIO accesses that we require to be strongly ordered
  75  * WRT preceding MMIO accesses.
  76  */
  77 #define readw_o readw_relaxed
  78 #define readl_o readl_relaxed
  79
  80 #define writew_o writew_relaxed
  81 #define writel_o writel_relaxed
  82
  83 /* Shorthands for MMIO accesses that we are happy with being weakly ordered
  84  * WRT preceding MMIO accesses.
  85  */
  86 #define readw_u readw_relaxed
  87 #define readl_u readl_relaxed
  88 #define readq_u readq_relaxed
  89
  90 #define writew_u writew_relaxed
  91 #define writel_u writel_relaxed
  92 #define writeq_u writeq_relaxed
  93
  94 static inline struct sk_buff *fza_alloc_skb_irq(struct net_device *dev,
  95                                                 unsigned int length)
  96 {
  97         return __netdev_alloc_skb(dev, length, GFP_ATOMIC);
  98 }
  99
 100 static inline struct sk_buff *fza_alloc_skb(struct net_device *dev,
 101                                             unsigned int length)
 102 {
 103         return __netdev_alloc_skb(dev, length, GFP_KERNEL);
 104 }
 105
 106 static inline void fza_skb_align(struct sk_buff *skb, unsigned int v)
 107 {
 108         unsigned long x, y;
 109
 110         x = (unsigned long)skb->data;
 111         y = ALIGN(x, v);
 112
 113         skb_reserve(skb, y - x);
 114 }
 115
 116 static inline void fza_reads(const void __iomem *from, void *to,
 117                              unsigned long size)
 118 {
 119         if (sizeof(unsigned long) == 8) {
 120                 const u64 __iomem *src = from;
 121                 const u32 __iomem *src_trail;
 122                 u64 *dst = to;
 123                 u32 *dst_trail;
 124
 125                 for (size = (size + 3) / 4; size > 1; size -= 2)
 126                         *dst++ = readq_u(src++);
 127                 if (size) {
 128                         src_trail = (u32 __iomem *)src;
 129                         dst_trail = (u32 *)dst;
 130                         *dst_trail = readl_u(src_trail);
 131                 }
 132         } else {
 133                 const u32 __iomem *src = from;
 134                 u32 *dst = to;
 135
 136                 for (size = (size + 3) / 4; size; size--)
 137                         *dst++ = readl_u(src++);
 138         }
 139 }
 140
 141 static inline void fza_writes(const void *from, void __iomem *to,
 142                               unsigned long size)
 143 {
 144         if (sizeof(unsigned long) == 8) {
 145                 const u64 *src = from;
 146                 const u32 *src_trail;
 147                 u64 __iomem *dst = to;
 148                 u32 __iomem *dst_trail;
 149
 150                 for (size = (size + 3) / 4; size > 1; size -= 2)
 151                         writeq_u(*src++, dst++);
 152                 if (size) {
 153                         src_trail = (u32 *)src;
 154                         dst_trail = (u32 __iomem *)dst;
 155                         writel_u(*src_trail, dst_trail);
 156                 }
 157         } else {
 158                 const u32 *src = from;
 159                 u32 __iomem *dst = to;
 160
 161                 for (size = (size + 3) / 4; size; size--)
 162                         writel_u(*src++, dst++);
 163         }
 164 }
 165
 166 static inline void fza_moves(const void __iomem *from, void __iomem *to,
 167                              unsigned long size)
 168 {
 169         if (sizeof(unsigned long) == 8) {
 170                 const u64 __iomem *src = from;
 171                 const u32 __iomem *src_trail;
 172                 u64 __iomem *dst = to;
 173                 u32 __iomem *dst_trail;
 174
 175                 for (size = (size + 3) / 4; size > 1; size -= 2)
 176                         writeq_u(readq_u(src++), dst++);
 177                 if (size) {
 178                         src_trail = (u32 __iomem *)src;
 179                         dst_trail = (u32 __iomem *)dst;
 180                         writel_u(readl_u(src_trail), dst_trail);
 181                 }
 182         } else {
 183                 const u32 __iomem *src = from;
 184                 u32 __iomem *dst = to;
 185
 186                 for (size = (size + 3) / 4; size; size--)
 187                         writel_u(readl_u(src++), dst++);
 188         }
 189 }
 190
 191 static inline void fza_zeros(void __iomem *to, unsigned long size)
 192 {
 193         if (sizeof(unsigned long) == 8) {
 194                 u64 __iomem *dst = to;
 195                 u32 __iomem *dst_trail;
 196
 197                 for (size = (size + 3) / 4; size > 1; size -= 2)
 198                         writeq_u(0, dst++);
 199                 if (size) {
 200                         dst_trail = (u32 __iomem *)dst;
 201                         writel_u(0, dst_trail);
 202                 }
 203         } else {
 204                 u32 __iomem *dst = to;
 205
 206                 for (size = (size + 3) / 4; size; size--)
 207                         writel_u(0, dst++);
 208         }
 209 }
 210
 211 static inline void fza_regs_dump(struct fza_private *fp)
 212 {
 213         pr_debug("%s: iomem registers:\n", fp->name);
 214         pr_debug(" reset:           0x%04x\n", readw_o(&fp->regs->reset));
 215         pr_debug(" interrupt event: 0x%04x\n", readw_u(&fp->regs->int_event));
 216         pr_debug(" status:          0x%04x\n", readw_u(&fp->regs->status));
 217         pr_debug(" interrupt mask:  0x%04x\n", readw_u(&fp->regs->int_mask));
 218         pr_debug(" control A:       0x%04x\n", readw_u(&fp->regs->control_a));
 219         pr_debug(" control B:       0x%04x\n", readw_u(&fp->regs->control_b));
 220 }
 221
 222 static inline void fza_do_reset(struct fza_private *fp)
 223 {
 224         /* Reset the board. */
 225         writew_o(FZA_RESET_INIT, &fp->regs->reset);
 226         readw_o(&fp->regs->reset);      /* Synchronize. */
 227         readw_o(&fp->regs->reset);      /* Read it back for a small delay. */
 228         writew_o(FZA_RESET_CLR, &fp->regs->reset);
 229
 230         /* Enable all interrupt events we handle. */
 231         writew_o(fp->int_mask, &fp->regs->int_mask);
 232         readw_o(&fp->regs->int_mask);   /* Synchronize. */
 233 }
 234
 235 static inline void fza_do_shutdown(struct fza_private *fp)
 236 {
 237         /* Disable the driver mode. */
 238         writew_o(FZA_CONTROL_B_IDLE, &fp->regs->control_b);
 239
 240         /* And reset the board. */
 241         writew_o(FZA_RESET_INIT, &fp->regs->reset);
 242         readw_o(&fp->regs->reset);      /* Synchronize. */
 243         writew_o(FZA_RESET_CLR, &fp->regs->reset);
 244         readw_o(&fp->regs->reset);      /* Synchronize. */
 245 }
 246
 247 static int fza_reset(struct fza_private *fp)
 248 {
 249         unsigned long flags;
 250         uint status, state;
 251         long t;
 252
 253         pr_info("%s: resetting the board...\n", fp->name);
 254
 255         spin_lock_irqsave(&fp->lock, flags);
 256         fp->state_chg_flag = 0;
 257         fza_do_reset(fp);
 258         spin_unlock_irqrestore(&fp->lock, flags);
 259
 260         /* DEC says RESET needs up to 30 seconds to complete.  My DEFZA-AA
 261          * rev. C03 happily finishes in 9.7 seconds. :-)  But we need to
 262          * be on the safe side...
 263          */
 264         t = wait_event_timeout(fp->state_chg_wait, fp->state_chg_flag,
 265                                45 * HZ);
 266         status = readw_u(&fp->regs->status);
 267         state = FZA_STATUS_GET_STATE(status);
 268         if (fp->state_chg_flag == 0) {
 269                 pr_err("%s: RESET timed out!, state %x\n", fp->name, state);
 270                 return -EIO;
 271         }
 272         if (state != FZA_STATE_UNINITIALIZED) {
 273                 pr_err("%s: RESET failed!, state %x, failure ID %x\n",
 274                        fp->name, state, FZA_STATUS_GET_TEST(status));
 275                 return -EIO;
 276         }
 277         pr_info("%s: OK\n", fp->name);
 278         pr_debug("%s: RESET: %lums elapsed\n", fp->name,
 279                  (45 * HZ - t) * 1000 / HZ);
 280
 281         return 0;
 282 }
 283
 284 static struct fza_ring_cmd __iomem *fza_cmd_send(struct net_device *dev,
 285                                                  int command)
 286 {
 287         struct fza_private *fp = netdev_priv(dev);
 288         struct fza_ring_cmd __iomem *ring = fp->ring_cmd + fp->ring_cmd_index;
 289         unsigned int old_mask, new_mask;
 290         union fza_cmd_buf __iomem *buf;
 291         struct netdev_hw_addr *ha;
 292         int i;
 293
 294         old_mask = fp->int_mask;
 295         new_mask = old_mask & ~FZA_MASK_STATE_CHG;
 296         writew_u(new_mask, &fp->regs->int_mask);
 297         readw_o(&fp->regs->int_mask);                   /* Synchronize. */
 298         fp->int_mask = new_mask;
 299
 300         buf = fp->mmio + readl_u(&ring->buffer);
 301
 302         if ((readl_u(&ring->cmd_own) & FZA_RING_OWN_MASK) !=
 303             FZA_RING_OWN_HOST) {
 304                 pr_warn("%s: command buffer full, command: %u!\n", fp->name,
 305                         command);
 306                 return NULL;
 307         }
 308
 309         switch (command) {
 310         case FZA_RING_CMD_INIT:
 311                 writel_u(FZA_RING_TX_MODE, &buf->init.tx_mode);
 312                 writel_u(FZA_RING_RX_SIZE, &buf->init.hst_rx_size);
 313                 fza_zeros(&buf->init.counters, sizeof(buf->init.counters));
 314                 break;
 315
 316         case FZA_RING_CMD_MODCAM:
 317                 i = 0;
 318                 fza_writes(&hw_addr_purger, &buf->cam.hw_addr[i++],
 319                            sizeof(*buf->cam.hw_addr));
 320                 fza_writes(&hw_addr_beacon, &buf->cam.hw_addr[i++],
 321                            sizeof(*buf->cam.hw_addr));
 322                 netdev_for_each_mc_addr(ha, dev) {
 323                         if (i >= FZA_CMD_CAM_SIZE)
 324                                 break;
 325                         fza_writes(ha->addr, &buf->cam.hw_addr[i++],
 326                                    sizeof(*buf->cam.hw_addr));
 327                 }
 328                 while (i < FZA_CMD_CAM_SIZE)
 329                         fza_zeros(&buf->cam.hw_addr[i++],
 330                                   sizeof(*buf->cam.hw_addr));
 331                 break;
 332
 333         case FZA_RING_CMD_PARAM:
 334                 writel_u(loopback, &buf->param.loop_mode);
 335                 writel_u(fp->t_max, &buf->param.t_max);
 336                 writel_u(fp->t_req, &buf->param.t_req);
 337                 writel_u(fp->tvx, &buf->param.tvx);
 338                 writel_u(fp->lem_threshold, &buf->param.lem_threshold);
 339                 fza_writes(&fp->station_id, &buf->param.station_id,
 340                            sizeof(buf->param.station_id));
 341                 /* Convert to milliseconds due to buggy firmware. */
 342                 writel_u(fp->rtoken_timeout / 12500,
 343                          &buf->param.rtoken_timeout);
 344                 writel_u(fp->ring_purger, &buf->param.ring_purger);
 345                 break;
 346
 347         case FZA_RING_CMD_MODPROM:
 348                 if (dev->flags & IFF_PROMISC) {
 349                         writel_u(1, &buf->modprom.llc_prom);
 350                         writel_u(1, &buf->modprom.smt_prom);
 351                 } else {
 352                         writel_u(0, &buf->modprom.llc_prom);
 353                         writel_u(0, &buf->modprom.smt_prom);
 354                 }
 355                 if (dev->flags & IFF_ALLMULTI ||
 356                     netdev_mc_count(dev) > FZA_CMD_CAM_SIZE - 2)
 357                         writel_u(1, &buf->modprom.llc_multi);
 358                 else
 359                         writel_u(0, &buf->modprom.llc_multi);
 360                 writel_u(1, &buf->modprom.llc_bcast);
 361                 break;
 362         }
 363
 364         /* Trigger the command. */
 365         writel_u(FZA_RING_OWN_FZA | command, &ring->cmd_own);
 366         writew_o(FZA_CONTROL_A_CMD_POLL, &fp->regs->control_a);
 367
 368         fp->ring_cmd_index = (fp->ring_cmd_index + 1) % FZA_RING_CMD_SIZE;
 369
 370         fp->int_mask = old_mask;
 371         writew_u(fp->int_mask, &fp->regs->int_mask);
 372
 373         return ring;
 374 }
 375
 376 static int fza_init_send(struct net_device *dev,
 377                          struct fza_cmd_init *__iomem *init)
 378 {
 379         struct fza_private *fp = netdev_priv(dev);
 380         struct fza_ring_cmd __iomem *ring;
 381         unsigned long flags;
 382         u32 stat;
 383         long t;
 384
 385         spin_lock_irqsave(&fp->lock, flags);
 386         fp->cmd_done_flag = 0;
 387         ring = fza_cmd_send(dev, FZA_RING_CMD_INIT);
 388         spin_unlock_irqrestore(&fp->lock, flags);
 389         if (!ring)
 390                 /* This should never happen in the uninitialized state,
 391                  * so do not try to recover and just consider it fatal.
 392                  */
 393                 return -ENOBUFS;
 394
 395         /* INIT may take quite a long time (160ms for my C03). */
 396         t = wait_event_timeout(fp->cmd_done_wait, fp->cmd_done_flag, 3 * HZ);
 397         if (fp->cmd_done_flag == 0) {
 398                 pr_err("%s: INIT command timed out!, state %x\n", fp->name,
 399                        FZA_STATUS_GET_STATE(readw_u(&fp->regs->status)));
 400                 return -EIO;
 401         }
 402         stat = readl_u(&ring->stat);
 403         if (stat != FZA_RING_STAT_SUCCESS) {
 404                 pr_err("%s: INIT command failed!, status %02x, state %x\n",
 405                        fp->name, stat,
 406                        FZA_STATUS_GET_STATE(readw_u(&fp->regs->status)));
 407                 return -EIO;
 408         }
 409         pr_debug("%s: INIT: %lums elapsed\n", fp->name,
 410                  (3 * HZ - t) * 1000 / HZ);
 411
 412         if (init)
 413                 *init = fp->mmio + readl_u(&ring->buffer);
 414         return 0;
 415 }
 416
 417 static void fza_rx_init(struct fza_private *fp)
 418 {
 419         int i;
 420
 421         /* Fill the host receive descriptor ring. */
 422         for (i = 0; i < FZA_RING_RX_SIZE; i++) {
 423                 writel_o(0, &fp->ring_hst_rx[i].rmc);
 424                 writel_o((fp->rx_dma[i] + 0x1000) >> 9,
 425                          &fp->ring_hst_rx[i].buffer1);
 426                 writel_o(fp->rx_dma[i] >> 9 | FZA_RING_OWN_FZA,
 427                          &fp->ring_hst_rx[i].buf0_own);
 428         }
 429 }
 430
 431 static void fza_set_rx_mode(struct net_device *dev)
 432 {
 433         fza_cmd_send(dev, FZA_RING_CMD_MODCAM);
 434         fza_cmd_send(dev, FZA_RING_CMD_MODPROM);
 435 }
 436
 437 union fza_buffer_txp {
 438         struct fza_buffer_tx *data_ptr;
 439         struct fza_buffer_tx __iomem *mmio_ptr;
 440 };
 441
 442 static int fza_do_xmit(union fza_buffer_txp ub, int len,
 443                        struct net_device *dev, int smt)
 444 {
 445         struct fza_private *fp = netdev_priv(dev);
 446         struct fza_buffer_tx __iomem *rmc_tx_ptr;
 447         int i, first, frag_len, left_len;
 448         u32 own, rmc;
 449
 450         if (((((fp->ring_rmc_txd_index - 1 + fp->ring_rmc_tx_size) -
 451                fp->ring_rmc_tx_index) % fp->ring_rmc_tx_size) *
 452              FZA_TX_BUFFER_SIZE) < len)
 453                 return 1;
 454
 455         first = fp->ring_rmc_tx_index;
 456
 457         left_len = len;
 458         frag_len = FZA_TX_BUFFER_SIZE;
 459         /* First descriptor is relinquished last. */
 460         own = FZA_RING_TX_OWN_HOST;
 461         /* First descriptor carries frame length; we don't use cut-through. */
 462         rmc = FZA_RING_TX_SOP | FZA_RING_TX_VBC | len;
 463         do {
 464                 i = fp->ring_rmc_tx_index;
 465                 rmc_tx_ptr = &fp->buffer_tx[i];
 466
 467                 if (left_len < FZA_TX_BUFFER_SIZE)
 468                         frag_len = left_len;
 469                 left_len -= frag_len;
 470
 471                 /* Length must be a multiple of 4 as only word writes are
 472                  * permitted!
 473                  */
 474                 frag_len = (frag_len + 3) & ~3;
 475                 if (smt)
 476                         fza_moves(ub.mmio_ptr, rmc_tx_ptr, frag_len);
 477                 else
 478                         fza_writes(ub.data_ptr, rmc_tx_ptr, frag_len);
 479
 480                 if (left_len == 0)
 481                         rmc |= FZA_RING_TX_EOP;         /* Mark last frag. */
 482
 483                 writel_o(rmc, &fp->ring_rmc_tx[i].rmc);
 484                 writel_o(own, &fp->ring_rmc_tx[i].own);
 485
 486                 ub.data_ptr++;
 487                 fp->ring_rmc_tx_index = (fp->ring_rmc_tx_index + 1) %
 488                                         fp->ring_rmc_tx_size;
 489
 490                 /* Settings for intermediate frags. */
 491                 own = FZA_RING_TX_OWN_RMC;
 492                 rmc = 0;
 493         } while (left_len > 0);
 494
 495         if (((((fp->ring_rmc_txd_index - 1 + fp->ring_rmc_tx_size) -
 496                fp->ring_rmc_tx_index) % fp->ring_rmc_tx_size) *
 497              FZA_TX_BUFFER_SIZE) < dev->mtu + dev->hard_header_len) {
 498                 netif_stop_queue(dev);
 499                 pr_debug("%s: queue stopped\n", fp->name);
 500         }
 501
 502         writel_o(FZA_RING_TX_OWN_RMC, &fp->ring_rmc_tx[first].own);
 503
 504         /* Go, go, go! */
 505         writew_o(FZA_CONTROL_A_TX_POLL, &fp->regs->control_a);
 506
 507         return 0;
 508 }
 509
 510 static int fza_do_recv_smt(struct fza_buffer_tx *data_ptr, int len,
 511                            u32 rmc, struct net_device *dev)
 512 {
 513         struct fza_private *fp = netdev_priv(dev);
 514         struct fza_buffer_tx __iomem *smt_rx_ptr;
 515         u32 own;
 516         int i;
 517
 518         i = fp->ring_smt_rx_index;
 519         own = readl_o(&fp->ring_smt_rx[i].own);
 520         if ((own & FZA_RING_OWN_MASK) == FZA_RING_OWN_FZA)
 521                 return 1;
 522
 523         smt_rx_ptr = fp->mmio + readl_u(&fp->ring_smt_rx[i].buffer);
 524
 525         /* Length must be a multiple of 4 as only word writes are permitted! */
 526         fza_writes(data_ptr, smt_rx_ptr, (len + 3) & ~3);
 527
 528         writel_o(rmc, &fp->ring_smt_rx[i].rmc);
 529         writel_o(FZA_RING_OWN_FZA, &fp->ring_smt_rx[i].own);
 530
 531         fp->ring_smt_rx_index =
 532                 (fp->ring_smt_rx_index + 1) % fp->ring_smt_rx_size;
 533
 534         /* Grab it! */
 535         writew_o(FZA_CONTROL_A_SMT_RX_POLL, &fp->regs->control_a);
 536
 537         return 0;
 538 }
 539
 540 static void fza_tx(struct net_device *dev)
 541 {
 542         struct fza_private *fp = netdev_priv(dev);
 543         u32 own, rmc;
 544         int i;
 545
 546         while (1) {
 547                 i = fp->ring_rmc_txd_index;
 548                 if (i == fp->ring_rmc_tx_index)
 549                         break;
 550                 own = readl_o(&fp->ring_rmc_tx[i].own);
 551                 if ((own & FZA_RING_OWN_MASK) == FZA_RING_TX_OWN_RMC)
 552                         break;
 553
 554                 rmc = readl_u(&fp->ring_rmc_tx[i].rmc);
 555                 /* Only process the first descriptor. */
 556                 if ((rmc & FZA_RING_TX_SOP) != 0) {
 557                         if ((rmc & FZA_RING_TX_DCC_MASK) ==
 558                             FZA_RING_TX_DCC_SUCCESS) {
 559                                 int pkt_len = (rmc & FZA_RING_PBC_MASK) - 3;
 560                                                                 /* Omit PRH. */
 561
 562                                 fp->stats.tx_packets++;
 563                                 fp->stats.tx_bytes += pkt_len;
 564                         } else {
 565                                 fp->stats.tx_errors++;
 566                                 switch (rmc & FZA_RING_TX_DCC_MASK) {
 567                                 case FZA_RING_TX_DCC_DTP_SOP:
 568                                 case FZA_RING_TX_DCC_DTP:
 569                                 case FZA_RING_TX_DCC_ABORT:
 570                                         fp->stats.tx_aborted_errors++;
 571                                         break;
 572                                 case FZA_RING_TX_DCC_UNDRRUN:
 573                                         fp->stats.tx_fifo_errors++;
 574                                         break;
 575                                 case FZA_RING_TX_DCC_PARITY:
 576                                 default:
 577                                         break;
 578                                 }
 579                         }
 580                 }
 581
 582                 fp->ring_rmc_txd_index = (fp->ring_rmc_txd_index + 1) %
 583                                          fp->ring_rmc_tx_size;
 584         }
 585
 586         if (((((fp->ring_rmc_txd_index - 1 + fp->ring_rmc_tx_size) -
 587                fp->ring_rmc_tx_index) % fp->ring_rmc_tx_size) *
 588              FZA_TX_BUFFER_SIZE) >= dev->mtu + dev->hard_header_len) {
 589                 if (fp->queue_active) {
 590                         netif_wake_queue(dev);
 591                         pr_debug("%s: queue woken\n", fp->name);
 592                 }
 593         }
 594 }
 595
 596 static inline int fza_rx_err(struct fza_private *fp,
 597                              const u32 rmc, const u8 fc)
 598 {
 599         int len, min_len, max_len;
 600
 601         len = rmc & FZA_RING_PBC_MASK;
 602
 603         if (unlikely((rmc & FZA_RING_RX_BAD) != 0)) {
 604                 fp->stats.rx_errors++;
 605
 606                 /* Check special status codes. */
 607                 if ((rmc & (FZA_RING_RX_CRC | FZA_RING_RX_RRR_MASK |
 608                             FZA_RING_RX_DA_MASK | FZA_RING_RX_SA_MASK)) ==
 609                      (FZA_RING_RX_CRC | FZA_RING_RX_RRR_DADDR |
 610                       FZA_RING_RX_DA_CAM | FZA_RING_RX_SA_ALIAS)) {
 611                         if (len >= 8190)
 612                                 fp->stats.rx_length_errors++;
 613                         return 1;
 614                 }
 615                 if ((rmc & (FZA_RING_RX_CRC | FZA_RING_RX_RRR_MASK |
 616                             FZA_RING_RX_DA_MASK | FZA_RING_RX_SA_MASK)) ==
 617                      (FZA_RING_RX_CRC | FZA_RING_RX_RRR_DADDR |
 618                       FZA_RING_RX_DA_CAM | FZA_RING_RX_SA_CAM)) {
 619                         /* Halt the interface to trigger a reset. */
 620                         writew_o(FZA_CONTROL_A_HALT, &fp->regs->control_a);
 621                         readw_o(&fp->regs->control_a);  /* Synchronize. */
 622                         return 1;
 623                 }
 624
 625                 /* Check the MAC status. */
 626                 switch (rmc & FZA_RING_RX_RRR_MASK) {
 627                 case FZA_RING_RX_RRR_OK:
 628                         if ((rmc & FZA_RING_RX_CRC) != 0)
 629                                 fp->stats.rx_crc_errors++;
 630                         else if ((rmc & FZA_RING_RX_FSC_MASK) == 0 ||
 631                                  (rmc & FZA_RING_RX_FSB_ERR) != 0)
 632                                 fp->stats.rx_frame_errors++;
 633                         return 1;
 634                 case FZA_RING_RX_RRR_SADDR:
 635                 case FZA_RING_RX_RRR_DADDR:
 636                 case FZA_RING_RX_RRR_ABORT:
 637                         /* Halt the interface to trigger a reset. */
 638                         writew_o(FZA_CONTROL_A_HALT, &fp->regs->control_a);
 639                         readw_o(&fp->regs->control_a);  /* Synchronize. */
 640                         return 1;
 641                 case FZA_RING_RX_RRR_LENGTH:
 642                         fp->stats.rx_frame_errors++;
 643                         return 1;
 644                 default:
 645                         return 1;
 646                 }
 647         }
 648
 649         /* Packet received successfully; validate the length. */
 650         switch (fc & FDDI_FC_K_FORMAT_MASK) {
 651         case FDDI_FC_K_FORMAT_MANAGEMENT:
 652                 if ((fc & FDDI_FC_K_CLASS_MASK) == FDDI_FC_K_CLASS_ASYNC)
 653                         min_len = 37;
 654                 else
 655                         min_len = 17;
 656                 break;
 657         case FDDI_FC_K_FORMAT_LLC:
 658                 min_len = 20;
 659                 break;
 660         default:
 661                 min_len = 17;
 662                 break;
 663         }
 664         max_len = 4495;
 665         if (len < min_len || len > max_len) {
 666                 fp->stats.rx_errors++;
 667                 fp->stats.rx_length_errors++;
 668                 return 1;
 669         }
 670
 671         return 0;
 672 }
 673
 674 static void fza_rx(struct net_device *dev)
 675 {
 676         struct fza_private *fp = netdev_priv(dev);
 677         struct sk_buff *skb, *newskb;
 678         struct fza_fddihdr *frame;
 679         dma_addr_t dma, newdma;
 680         u32 own, rmc, buf;
 681         int i, len;
 682         u8 fc;
 683
 684         while (1) {
 685                 i = fp->ring_hst_rx_index;
 686                 own = readl_o(&fp->ring_hst_rx[i].buf0_own);
 687                 if ((own & FZA_RING_OWN_MASK) == FZA_RING_OWN_FZA)
 688                         break;
 689
 690                 rmc = readl_u(&fp->ring_hst_rx[i].rmc);
 691                 skb = fp->rx_skbuff[i];
 692                 dma = fp->rx_dma[i];
 693
 694                 /* The RMC doesn't count the preamble and the starting
 695                  * delimiter.  We fix it up here for a total of 3 octets.
 696                  */
 697                 dma_rmb();
 698                 len = (rmc & FZA_RING_PBC_MASK) + 3;
 699                 frame = (struct fza_fddihdr *)skb->data;
 700
 701                 /* We need to get at real FC. */
 702                 dma_sync_single_for_cpu(fp->bdev,
 703                                         dma +
 704                                         ((u8 *)&frame->hdr.fc - (u8 *)frame),
 705                                         sizeof(frame->hdr.fc),
 706                                         DMA_FROM_DEVICE);
 707                 fc = frame->hdr.fc;
 708
 709                 if (fza_rx_err(fp, rmc, fc))
 710                         goto err_rx;
 711
 712                 /* We have to 512-byte-align RX buffers... */
 713                 newskb = fza_alloc_skb_irq(dev, FZA_RX_BUFFER_SIZE + 511);
 714                 if (newskb) {
 715                         fza_skb_align(newskb, 512);
 716                         newdma = dma_map_single(fp->bdev, newskb->data,
 717                                                 FZA_RX_BUFFER_SIZE,
 718                                                 DMA_FROM_DEVICE);
 719                         if (dma_mapping_error(fp->bdev, newdma)) {
 720                                 dev_kfree_skb_irq(newskb);
 721                                 newskb = NULL;
 722                         }
 723                 }
 724                 if (newskb) {
 725                         int pkt_len = len - 7;  /* Omit P, SD and FCS. */
 726                         int is_multi;
 727                         int rx_stat;
 728
 729                         dma_unmap_single(fp->bdev, dma, FZA_RX_BUFFER_SIZE,
 730                                          DMA_FROM_DEVICE);
 731
 732                         /* Queue SMT frames to the SMT receive ring. */
 733                         if ((fc & (FDDI_FC_K_CLASS_MASK |
 734                                    FDDI_FC_K_FORMAT_MASK)) ==
 735                              (FDDI_FC_K_CLASS_ASYNC |
 736                               FDDI_FC_K_FORMAT_MANAGEMENT) &&
 737                             (rmc & FZA_RING_RX_DA_MASK) !=
 738                              FZA_RING_RX_DA_PROM) {
 739                                 if (fza_do_recv_smt((struct fza_buffer_tx *)
 740                                                     skb->data, len, rmc,
 741                                                     dev)) {
 742                                         writel_o(FZA_CONTROL_A_SMT_RX_OVFL,
 743                                                  &fp->regs->control_a);
 744                                 }
 745                         }
 746
 747                         is_multi = ((frame->hdr.daddr[0] & 0x01) != 0);
 748
 749                         skb_reserve(skb, 3);    /* Skip over P and SD. */
 750                         skb_put(skb, pkt_len);  /* And cut off FCS. */
 751                         skb->protocol = fddi_type_trans(skb, dev);
 752
 753                         rx_stat = netif_rx(skb);
 754                         if (rx_stat != NET_RX_DROP) {
 755                                 fp->stats.rx_packets++;
 756                                 fp->stats.rx_bytes += pkt_len;
 757                                 if (is_multi)
 758                                         fp->stats.multicast++;
 759                         } else {
 760                                 fp->stats.rx_dropped++;
 761                         }
 762
 763                         skb = newskb;
 764                         dma = newdma;
 765                         fp->rx_skbuff[i] = skb;
 766                         fp->rx_dma[i] = dma;
 767                 } else {
 768                         fp->stats.rx_dropped++;
 769                         pr_notice("%s: memory squeeze, dropping packet\n",
 770                                   fp->name);
 771                 }
 772
 773 err_rx:
 774                 writel_o(0, &fp->ring_hst_rx[i].rmc);
 775                 buf = (dma + 0x1000) >> 9;
 776                 writel_o(buf, &fp->ring_hst_rx[i].buffer1);
 777                 buf = dma >> 9 | FZA_RING_OWN_FZA;
 778                 writel_o(buf, &fp->ring_hst_rx[i].buf0_own);
 779                 fp->ring_hst_rx_index =
 780                         (fp->ring_hst_rx_index + 1) % fp->ring_hst_rx_size;
 781         }
 782 }
 783
 784 static void fza_tx_smt(struct net_device *dev)
 785 {
 786         struct fza_private *fp = netdev_priv(dev);
 787         struct fza_buffer_tx __iomem *smt_tx_ptr, *skb_data_ptr;
 788         int i, len;
 789         u32 own;
 790
 791         while (1) {
 792                 i = fp->ring_smt_tx_index;
 793                 own = readl_o(&fp->ring_smt_tx[i].own);
 794                 if ((own & FZA_RING_OWN_MASK) == FZA_RING_OWN_FZA)
 795                         break;
 796
 797                 smt_tx_ptr = fp->mmio + readl_u(&fp->ring_smt_tx[i].buffer);
 798                 len = readl_u(&fp->ring_smt_tx[i].rmc) & FZA_RING_PBC_MASK;
 799
 800                 if (!netif_queue_stopped(dev)) {
 801                         if (dev_nit_active(dev)) {
 802                                 struct sk_buff *skb;
 803
 804                                 /* Length must be a multiple of 4 as only word
 805                                  * reads are permitted!
 806                                  */
 807                                 skb = fza_alloc_skb_irq(dev, (len + 3) & ~3);
 808                                 if (!skb)
 809                                         goto err_no_skb;        /* Drop. */
 810
 811                                 skb_data_ptr = (struct fza_buffer_tx *)
 812                                                skb->data;
 813
 814                                 fza_reads(smt_tx_ptr, skb_data_ptr,
 815                                           (len + 3) & ~3);
 816                                 skb->dev = dev;
 817                                 skb_reserve(skb, 3);    /* Skip over PRH. */
 818                                 skb_put(skb, len - 3);
 819                                 skb_reset_network_header(skb);
 820
 821                                 dev_queue_xmit_nit(skb, dev);
 822
 823                                 dev_kfree_skb_irq(skb);
 824
 825 err_no_skb:
 826                                 ;
 827                         }
 828
 829                         /* Queue the frame to the RMC transmit ring. */
 830                         fza_do_xmit((union fza_buffer_txp)
 831                                     { .mmio_ptr = smt_tx_ptr },
 832                                     len, dev, 1);
 833                 }
 834
 835                 writel_o(FZA_RING_OWN_FZA, &fp->ring_smt_tx[i].own);
 836                 fp->ring_smt_tx_index =
 837                         (fp->ring_smt_tx_index + 1) % fp->ring_smt_tx_size;
 838         }
 839 }
 840
 841 static void fza_uns(struct net_device *dev)
 842 {
 843         struct fza_private *fp = netdev_priv(dev);
 844         u32 own;
 845         int i;
 846
 847         while (1) {
 848                 i = fp->ring_uns_index;
 849                 own = readl_o(&fp->ring_uns[i].own);
 850                 if ((own & FZA_RING_OWN_MASK) == FZA_RING_OWN_FZA)
 851                         break;
 852
 853                 if (readl_u(&fp->ring_uns[i].id) == FZA_RING_UNS_RX_OVER) {
 854                         fp->stats.rx_errors++;
 855                         fp->stats.rx_over_errors++;
 856                 }
 857
 858                 writel_o(FZA_RING_OWN_FZA, &fp->ring_uns[i].own);
 859                 fp->ring_uns_index =
 860                         (fp->ring_uns_index + 1) % FZA_RING_UNS_SIZE;
 861         }
 862 }
 863
 864 static void fza_tx_flush(struct net_device *dev)
 865 {
 866         struct fza_private *fp = netdev_priv(dev);
 867         u32 own;
 868         int i;
 869
 870         /* Clean up the SMT TX ring. */
 871         i = fp->ring_smt_tx_index;
 872         do {
 873                 writel_o(FZA_RING_OWN_FZA, &fp->ring_smt_tx[i].own);
 874                 fp->ring_smt_tx_index =
 875                         (fp->ring_smt_tx_index + 1) % fp->ring_smt_tx_size;
 876
 877         } while (i != fp->ring_smt_tx_index);
 878
 879         /* Clean up the RMC TX ring. */
 880         i = fp->ring_rmc_tx_index;
 881         do {
 882                 own = readl_o(&fp->ring_rmc_tx[i].own);
 883                 if ((own & FZA_RING_OWN_MASK) == FZA_RING_TX_OWN_RMC) {
 884                         u32 rmc = readl_u(&fp->ring_rmc_tx[i].rmc);
 885
 886                         writel_u(rmc | FZA_RING_TX_DTP,
 887                                  &fp->ring_rmc_tx[i].rmc);
 888                 }
 889                 fp->ring_rmc_tx_index =
 890                         (fp->ring_rmc_tx_index + 1) % fp->ring_rmc_tx_size;
 891
 892         } while (i != fp->ring_rmc_tx_index);
 893
 894         /* Done. */
 895         writew_o(FZA_CONTROL_A_FLUSH_DONE, &fp->regs->control_a);
 896 }
 897
 898 static irqreturn_t fza_interrupt(int irq, void *dev_id)
 899 {
 900         struct net_device *dev = dev_id;
 901         struct fza_private *fp = netdev_priv(dev);
 902         uint int_event;
 903
 904         /* Get interrupt events. */
 905         int_event = readw_o(&fp->regs->int_event) & fp->int_mask;
 906         if (int_event == 0)
 907                 return IRQ_NONE;
 908
 909         /* Clear the events. */
 910         writew_u(int_event, &fp->regs->int_event);
 911
 912         /* Now handle the events.  The order matters. */
 913
 914         /* Command finished interrupt. */
 915         if ((int_event & FZA_EVENT_CMD_DONE) != 0) {
 916                 fp->irq_count_cmd_done++;
 917
 918                 spin_lock(&fp->lock);
 919                 fp->cmd_done_flag = 1;
 920                 wake_up(&fp->cmd_done_wait);
 921                 spin_unlock(&fp->lock);
 922         }
 923
 924         /* Transmit finished interrupt. */
 925         if ((int_event & FZA_EVENT_TX_DONE) != 0) {
 926                 fp->irq_count_tx_done++;
 927                 fza_tx(dev);
 928         }
 929
 930         /* Host receive interrupt. */
 931         if ((int_event & FZA_EVENT_RX_POLL) != 0) {
 932                 fp->irq_count_rx_poll++;
 933                 fza_rx(dev);
 934         }
 935
 936         /* SMT transmit interrupt. */
 937         if ((int_event & FZA_EVENT_SMT_TX_POLL) != 0) {
 938                 fp->irq_count_smt_tx_poll++;
 939                 fza_tx_smt(dev);
 940         }
 941
 942         /* Transmit ring flush request. */
 943         if ((int_event & FZA_EVENT_FLUSH_TX) != 0) {
 944                 fp->irq_count_flush_tx++;
 945                 fza_tx_flush(dev);
 946         }
 947
 948         /* Link status change interrupt. */
 949         if ((int_event & FZA_EVENT_LINK_ST_CHG) != 0) {
 950                 uint status;
 951
 952                 fp->irq_count_link_st_chg++;
 953                 status = readw_u(&fp->regs->status);
 954                 if (FZA_STATUS_GET_LINK(status) == FZA_LINK_ON) {
 955                         netif_carrier_on(dev);
 956                         pr_info("%s: link available\n", fp->name);
 957                 } else {
 958                         netif_carrier_off(dev);
 959                         pr_info("%s: link unavailable\n", fp->name);
 960                 }
 961         }
 962
 963         /* Unsolicited event interrupt. */
 964         if ((int_event & FZA_EVENT_UNS_POLL) != 0) {
 965                 fp->irq_count_uns_poll++;
 966                 fza_uns(dev);
 967         }
 968
 969         /* State change interrupt. */
 970         if ((int_event & FZA_EVENT_STATE_CHG) != 0) {
 971                 uint status, state;
 972
 973                 fp->irq_count_state_chg++;
 974
 975                 status = readw_u(&fp->regs->status);
 976                 state = FZA_STATUS_GET_STATE(status);
 977                 pr_debug("%s: state change: %x\n", fp->name, state);
 978                 switch (state) {
 979                 case FZA_STATE_RESET:
 980                         break;
 981
 982                 case FZA_STATE_UNINITIALIZED:
 983                         netif_carrier_off(dev);
 984                         del_timer_sync(&fp->reset_timer);
 985                         fp->ring_cmd_index = 0;
 986                         fp->ring_uns_index = 0;
 987                         fp->ring_rmc_tx_index = 0;
 988                         fp->ring_rmc_txd_index = 0;
 989                         fp->ring_hst_rx_index = 0;
 990                         fp->ring_smt_tx_index = 0;
 991                         fp->ring_smt_rx_index = 0;
 992                         if (fp->state > state) {
 993                                 pr_info("%s: OK\n", fp->name);
 994                                 fza_cmd_send(dev, FZA_RING_CMD_INIT);
 995                         }
 996                         break;
 997
 998                 case FZA_STATE_INITIALIZED:
 999                         if (fp->state > state) {
1000                                 fza_set_rx_mode(dev);
1001                                 fza_cmd_send(dev, FZA_RING_CMD_PARAM);
1002                         }
1003                         break;
1004
1005                 case FZA_STATE_RUNNING:
1006                 case FZA_STATE_MAINTENANCE:
1007                         fp->state = state;
1008                         fza_rx_init(fp);
1009                         fp->queue_active = 1;
1010                         netif_wake_queue(dev);
1011                         pr_debug("%s: queue woken\n", fp->name);
1012                         break;
1013
1014                 case FZA_STATE_HALTED:
1015                         fp->queue_active = 0;
1016                         netif_stop_queue(dev);
1017                         pr_debug("%s: queue stopped\n", fp->name);
1018                         del_timer_sync(&fp->reset_timer);
1019                         pr_warn("%s: halted, reason: %x\n", fp->name,
1020                                 FZA_STATUS_GET_HALT(status));
1021                         fza_regs_dump(fp);
1022                         pr_info("%s: resetting the board...\n", fp->name);
1023                         fza_do_reset(fp);
1024                         fp->timer_state = 0;
1025                         fp->reset_timer.expires = jiffies + 45 * HZ;
1026                         add_timer(&fp->reset_timer);
1027                         break;
1028
1029                 default:
1030                         pr_warn("%s: undefined state: %x\n", fp->name, state);
1031                         break;
1032                 }
1033
1034                 spin_lock(&fp->lock);
1035                 fp->state_chg_flag = 1;
1036                 wake_up(&fp->state_chg_wait);
1037                 spin_unlock(&fp->lock);
1038         }
1039
1040         return IRQ_HANDLED;
1041 }
1042
1043 static void fza_reset_timer(struct timer_list *t)
1044 {
1045         struct fza_private *fp = from_timer(fp, t, reset_timer);
1046
1047         if (!fp->timer_state) {
1048                 pr_err("%s: RESET timed out!\n", fp->name);
1049                 pr_info("%s: trying harder...\n", fp->name);
1050
1051                 /* Assert the board reset. */
1052                 writew_o(FZA_RESET_INIT, &fp->regs->reset);
1053                 readw_o(&fp->regs->reset);              /* Synchronize. */
1054
1055                 fp->timer_state = 1;
1056                 fp->reset_timer.expires = jiffies + HZ;
1057         } else {
1058                 /* Clear the board reset. */
1059                 writew_u(FZA_RESET_CLR, &fp->regs->reset);
1060
1061                 /* Enable all interrupt events we handle. */
1062                 writew_o(fp->int_mask, &fp->regs->int_mask);
1063                 readw_o(&fp->regs->int_mask);           /* Synchronize. */
1064
1065                 fp->timer_state = 0;
1066                 fp->reset_timer.expires = jiffies + 45 * HZ;
1067         }
1068         add_timer(&fp->reset_timer);
1069 }
1070
1071 static int fza_set_mac_address(struct net_device *dev, void *addr)
1072 {
1073         return -EOPNOTSUPP;
1074 }
1075
1076 static netdev_tx_t fza_start_xmit(struct sk_buff *skb, struct net_device *dev)
1077 {
1078         struct fza_private *fp = netdev_priv(dev);
1079         unsigned int old_mask, new_mask;
1080         int ret;
1081         u8 fc;
1082
1083         skb_push(skb, 3);                       /* Make room for PRH. */
1084
1085         /* Decode FC to set PRH. */
1086         fc = skb->data[3];
1087         skb->data[0] = 0;
1088         skb->data[1] = 0;
1089         skb->data[2] = FZA_PRH2_NORMAL;
1090         if ((fc & FDDI_FC_K_CLASS_MASK) == FDDI_FC_K_CLASS_SYNC)
1091                 skb->data[0] |= FZA_PRH0_FRAME_SYNC;
1092         switch (fc & FDDI_FC_K_FORMAT_MASK) {
1093         case FDDI_FC_K_FORMAT_MANAGEMENT:
1094                 if ((fc & FDDI_FC_K_CONTROL_MASK) == 0) {
1095                         /* Token. */
1096                         skb->data[0] |= FZA_PRH0_TKN_TYPE_IMM;
1097                         skb->data[1] |= FZA_PRH1_TKN_SEND_NONE;
1098                 } else {
1099                         /* SMT or MAC. */
1100                         skb->data[0] |= FZA_PRH0_TKN_TYPE_UNR;
1101                         skb->data[1] |= FZA_PRH1_TKN_SEND_UNR;
1102                 }
1103                 skb->data[1] |= FZA_PRH1_CRC_NORMAL;
1104                 break;
1105         case FDDI_FC_K_FORMAT_LLC:
1106         case FDDI_FC_K_FORMAT_FUTURE:
1107                 skb->data[0] |= FZA_PRH0_TKN_TYPE_UNR;
1108                 skb->data[1] |= FZA_PRH1_CRC_NORMAL | FZA_PRH1_TKN_SEND_UNR;
1109                 break;
1110         case FDDI_FC_K_FORMAT_IMPLEMENTOR:
1111                 skb->data[0] |= FZA_PRH0_TKN_TYPE_UNR;
1112                 skb->data[1] |= FZA_PRH1_TKN_SEND_ORIG;
1113                 break;
1114         }
1115
1116         /* SMT transmit interrupts may sneak frames into the RMC
1117          * transmit ring.  We disable them while queueing a frame
1118          * to maintain consistency.
1119          */
1120         old_mask = fp->int_mask;
1121         new_mask = old_mask & ~FZA_MASK_SMT_TX_POLL;
1122         writew_u(new_mask, &fp->regs->int_mask);
1123         readw_o(&fp->regs->int_mask);                   /* Synchronize. */
1124         fp->int_mask = new_mask;
1125         ret = fza_do_xmit((union fza_buffer_txp)
1126                           { .data_ptr = (struct fza_buffer_tx *)skb->data },
1127                           skb->len, dev, 0);
1128         fp->int_mask = old_mask;
1129         writew_u(fp->int_mask, &fp->regs->int_mask);
1130
1131         if (ret) {
1132                 /* Probably an SMT packet filled the remaining space,
1133                  * so just stop the queue, but don't report it as an error.
1134                  */
1135                 netif_stop_queue(dev);
1136                 pr_debug("%s: queue stopped\n", fp->name);
1137                 fp->stats.tx_dropped++;
1138         }
1139
1140         dev_kfree_skb(skb);
1141
1142         return ret;
1143 }
1144
1145 static int fza_open(struct net_device *dev)
1146 {
1147         struct fza_private *fp = netdev_priv(dev);
1148         struct fza_ring_cmd __iomem *ring;
1149         struct sk_buff *skb;
1150         unsigned long flags;
1151         dma_addr_t dma;
1152         int ret, i;
1153         u32 stat;
1154         long t;
1155
1156         for (i = 0; i < FZA_RING_RX_SIZE; i++) {
1157                 /* We have to 512-byte-align RX buffers... */
1158                 skb = fza_alloc_skb(dev, FZA_RX_BUFFER_SIZE + 511);
1159                 if (skb) {
1160                         fza_skb_align(skb, 512);
1161                         dma = dma_map_single(fp->bdev, skb->data,
1162                                              FZA_RX_BUFFER_SIZE,
1163                                              DMA_FROM_DEVICE);
1164                         if (dma_mapping_error(fp->bdev, dma)) {
1165                                 dev_kfree_skb(skb);
1166                                 skb = NULL;
1167                         }
1168                 }
1169                 if (!skb) {
1170                         for (--i; i >= 0; i--) {
1171                                 dma_unmap_single(fp->bdev, fp->rx_dma[i],
1172                                                  FZA_RX_BUFFER_SIZE,
1173                                                  DMA_FROM_DEVICE);
1174                                 dev_kfree_skb(fp->rx_skbuff[i]);
1175                                 fp->rx_dma[i] = 0;
1176                                 fp->rx_skbuff[i] = NULL;
1177                         }
1178                         return -ENOMEM;
1179                 }
1180                 fp->rx_skbuff[i] = skb;
1181                 fp->rx_dma[i] = dma;
1182         }
1183
1184         ret = fza_init_send(dev, NULL);
1185         if (ret != 0)
1186                 return ret;
1187
1188         /* Purger and Beacon multicasts need to be supplied before PARAM. */
1189         fza_set_rx_mode(dev);
1190
1191         spin_lock_irqsave(&fp->lock, flags);
1192         fp->cmd_done_flag = 0;
1193         ring = fza_cmd_send(dev, FZA_RING_CMD_PARAM);
1194         spin_unlock_irqrestore(&fp->lock, flags);
1195         if (!ring)
1196                 return -ENOBUFS;
1197
1198         t = wait_event_timeout(fp->cmd_done_wait, fp->cmd_done_flag, 3 * HZ);
1199         if (fp->cmd_done_flag == 0) {
1200                 pr_err("%s: PARAM command timed out!, state %x\n", fp->name,
1201                        FZA_STATUS_GET_STATE(readw_u(&fp->regs->status)));
1202                 return -EIO;
1203         }
1204         stat = readl_u(&ring->stat);
1205         if (stat != FZA_RING_STAT_SUCCESS) {
1206                 pr_err("%s: PARAM command failed!, status %02x, state %x\n",
1207                        fp->name, stat,
1208                        FZA_STATUS_GET_STATE(readw_u(&fp->regs->status)));
1209                 return -EIO;
1210         }
1211         pr_debug("%s: PARAM: %lums elapsed\n", fp->name,
1212                  (3 * HZ - t) * 1000 / HZ);
1213
1214         return 0;
1215 }
1216
1217 static int fza_close(struct net_device *dev)
1218 {
1219         struct fza_private *fp = netdev_priv(dev);
1220         unsigned long flags;
1221         uint state;
1222         long t;
1223         int i;
1224
1225         netif_stop_queue(dev);
1226         pr_debug("%s: queue stopped\n", fp->name);
1227
1228         del_timer_sync(&fp->reset_timer);
1229         spin_lock_irqsave(&fp->lock, flags);
1230         fp->state = FZA_STATE_UNINITIALIZED;
1231         fp->state_chg_flag = 0;
1232         /* Shut the interface down. */
1233         writew_o(FZA_CONTROL_A_SHUT, &fp->regs->control_a);
1234         readw_o(&fp->regs->control_a);                  /* Synchronize. */
1235         spin_unlock_irqrestore(&fp->lock, flags);
1236
1237         /* DEC says SHUT needs up to 10 seconds to complete. */
1238         t = wait_event_timeout(fp->state_chg_wait, fp->state_chg_flag,
1239                                15 * HZ);
1240         state = FZA_STATUS_GET_STATE(readw_o(&fp->regs->status));
1241         if (fp->state_chg_flag == 0) {
1242                 pr_err("%s: SHUT timed out!, state %x\n", fp->name, state);
1243                 return -EIO;
1244         }
1245         if (state != FZA_STATE_UNINITIALIZED) {
1246                 pr_err("%s: SHUT failed!, state %x\n", fp->name, state);
1247                 return -EIO;
1248         }
1249         pr_debug("%s: SHUT: %lums elapsed\n", fp->name,
1250                  (15 * HZ - t) * 1000 / HZ);
1251
1252         for (i = 0; i < FZA_RING_RX_SIZE; i++)
1253                 if (fp->rx_skbuff[i]) {
1254                         dma_unmap_single(fp->bdev, fp->rx_dma[i],
1255                                          FZA_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
1256                         dev_kfree_skb(fp->rx_skbuff[i]);
1257                         fp->rx_dma[i] = 0;
1258                         fp->rx_skbuff[i] = NULL;
1259                 }
1260
1261         return 0;
1262 }
1263
1264 static struct net_device_stats *fza_get_stats(struct net_device *dev)
1265 {
1266         struct fza_private *fp = netdev_priv(dev);
1267
1268         return &fp->stats;
1269 }
1270
1271 static int fza_probe(struct device *bdev)
1272 {
1273         static const struct net_device_ops netdev_ops = {
1274                 .ndo_open = fza_open,
1275                 .ndo_stop = fza_close,
1276                 .ndo_start_xmit = fza_start_xmit,
1277                 .ndo_set_rx_mode = fza_set_rx_mode,
1278                 .ndo_set_mac_address = fza_set_mac_address,
1279                 .ndo_get_stats = fza_get_stats,
1280         };
1281         static int version_printed;
1282         char rom_rev[4], fw_rev[4], rmc_rev[4];
1283         struct tc_dev *tdev = to_tc_dev(bdev);
1284         struct fza_cmd_init __iomem *init;
1285         resource_size_t start, len;
1286         struct net_device *dev;
1287         struct fza_private *fp;
1288         uint smt_ver, pmd_type;
1289         void __iomem *mmio;
1290         uint hw_addr[2];
1291         int ret, i;
1292
1293         if (!version_printed) {
1294                 pr_info("%s", version);
1295                 version_printed = 1;
1296         }
1297
1298         dev = alloc_fddidev(sizeof(*fp));
1299         if (!dev)
1300                 return -ENOMEM;
1301         SET_NETDEV_DEV(dev, bdev);
1302
1303         fp = netdev_priv(dev);
1304         dev_set_drvdata(bdev, dev);
1305
1306         fp->bdev = bdev;
1307         fp->name = dev_name(bdev);
1308
1309         /* Request the I/O MEM resource. */
1310         start = tdev->resource.start;
1311         len = tdev->resource.end - start + 1;
1312         if (!request_mem_region(start, len, dev_name(bdev))) {
1313                 pr_err("%s: cannot reserve MMIO region\n", fp->name);
1314                 ret = -EBUSY;
1315                 goto err_out_kfree;
1316         }
1317
1318         /* MMIO mapping setup. */
1319         mmio = ioremap_nocache(start, len);
1320         if (!mmio) {
1321                 pr_err("%s: cannot map MMIO\n", fp->name);
1322                 ret = -ENOMEM;
1323                 goto err_out_resource;
1324         }
1325
1326         /* Initialize the new device structure. */
1327         switch (loopback) {
1328         case FZA_LOOP_NORMAL:
1329         case FZA_LOOP_INTERN:
1330         case FZA_LOOP_EXTERN:
1331                 break;
1332         default:
1333                 loopback = FZA_LOOP_NORMAL;
1334         }
1335
1336         fp->mmio = mmio;
1337         dev->irq = tdev->interrupt;
1338
1339         pr_info("%s: DEC FDDIcontroller 700 or 700-C at 0x%08llx, irq %d\n",
1340                 fp->name, (long long)tdev->resource.start, dev->irq);
1341         pr_debug("%s: mapped at: 0x%p\n", fp->name, mmio);
1342
1343         fp->regs = mmio + FZA_REG_BASE;
1344         fp->ring_cmd = mmio + FZA_RING_CMD;
1345         fp->ring_uns = mmio + FZA_RING_UNS;
1346
1347         init_waitqueue_head(&fp->state_chg_wait);
1348         init_waitqueue_head(&fp->cmd_done_wait);
1349         spin_lock_init(&fp->lock);
1350         fp->int_mask = FZA_MASK_NORMAL;
1351
1352         timer_setup(&fp->reset_timer, fza_reset_timer, 0);
1353
1354         /* Sanitize the board. */
1355         fza_regs_dump(fp);
1356         fza_do_shutdown(fp);
1357
1358         ret = request_irq(dev->irq, fza_interrupt, IRQF_SHARED, fp->name, dev);
1359         if (ret != 0) {
1360                 pr_err("%s: unable to get IRQ %d!\n", fp->name, dev->irq);
1361                 goto err_out_map;
1362         }
1363
1364         /* Enable the driver mode. */
1365         writew_o(FZA_CONTROL_B_DRIVER, &fp->regs->control_b);
1366
1367         /* For some reason transmit done interrupts can trigger during
1368          * reset.  This avoids a division error in the handler.
1369          */
1370         fp->ring_rmc_tx_size = FZA_RING_TX_SIZE;
1371
1372         ret = fza_reset(fp);
1373         if (ret != 0)
1374                 goto err_out_irq;
1375
1376         ret = fza_init_send(dev, &init);
1377         if (ret != 0)
1378                 goto err_out_irq;
1379
1380         fza_reads(&init->hw_addr, &hw_addr, sizeof(hw_addr));
1381         memcpy(dev->dev_addr, &hw_addr, FDDI_K_ALEN);
1382
1383         fza_reads(&init->rom_rev, &rom_rev, sizeof(rom_rev));
1384         fza_reads(&init->fw_rev, &fw_rev, sizeof(fw_rev));
1385         fza_reads(&init->rmc_rev, &rmc_rev, sizeof(rmc_rev));
1386         for (i = 3; i >= 0 && rom_rev[i] == ' '; i--)
1387                 rom_rev[i] = 0;
1388         for (i = 3; i >= 0 && fw_rev[i] == ' '; i--)
1389                 fw_rev[i] = 0;
1390         for (i = 3; i >= 0 && rmc_rev[i] == ' '; i--)
1391                 rmc_rev[i] = 0;
1392
1393         fp->ring_rmc_tx = mmio + readl_u(&init->rmc_tx);
1394         fp->ring_rmc_tx_size = readl_u(&init->rmc_tx_size);
1395         fp->ring_hst_rx = mmio + readl_u(&init->hst_rx);
1396         fp->ring_hst_rx_size = readl_u(&init->hst_rx_size);
1397         fp->ring_smt_tx = mmio + readl_u(&init->smt_tx);
1398         fp->ring_smt_tx_size = readl_u(&init->smt_tx_size);
1399         fp->ring_smt_rx = mmio + readl_u(&init->smt_rx);
1400         fp->ring_smt_rx_size = readl_u(&init->smt_rx_size);
1401
1402         fp->buffer_tx = mmio + FZA_TX_BUFFER_ADDR(readl_u(&init->rmc_tx));
1403
1404         fp->t_max = readl_u(&init->def_t_max);
1405         fp->t_req = readl_u(&init->def_t_req);
1406         fp->tvx = readl_u(&init->def_tvx);
1407         fp->lem_threshold = readl_u(&init->lem_threshold);
1408         fza_reads(&init->def_station_id, &fp->station_id,
1409                   sizeof(fp->station_id));
1410         fp->rtoken_timeout = readl_u(&init->rtoken_timeout);
1411         fp->ring_purger = readl_u(&init->ring_purger);
1412
1413         smt_ver = readl_u(&init->smt_ver);
1414         pmd_type = readl_u(&init->pmd_type);
1415
1416         pr_debug("%s: INIT parameters:\n", fp->name);
1417         pr_debug("        tx_mode: %u\n", readl_u(&init->tx_mode));
1418         pr_debug("    hst_rx_size: %u\n", readl_u(&init->hst_rx_size));
1419         pr_debug("        rmc_rev: %.4s\n", rmc_rev);
1420         pr_debug("        rom_rev: %.4s\n", rom_rev);
1421         pr_debug("         fw_rev: %.4s\n", fw_rev);
1422         pr_debug("       mop_type: %u\n", readl_u(&init->mop_type));
1423         pr_debug("         hst_rx: 0x%08x\n", readl_u(&init->hst_rx));
1424         pr_debug("         rmc_tx: 0x%08x\n", readl_u(&init->rmc_tx));
1425         pr_debug("    rmc_tx_size: %u\n", readl_u(&init->rmc_tx_size));
1426         pr_debug("         smt_tx: 0x%08x\n", readl_u(&init->smt_tx));
1427         pr_debug("    smt_tx_size: %u\n", readl_u(&init->smt_tx_size));
1428         pr_debug("         smt_rx: 0x%08x\n", readl_u(&init->smt_rx));
1429         pr_debug("    smt_rx_size: %u\n", readl_u(&init->smt_rx_size));
1430         /* TC systems are always LE, so don't bother swapping. */
1431         pr_debug("        hw_addr: 0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
1432                  (readl_u(&init->hw_addr[0]) >> 0) & 0xff,
1433                  (readl_u(&init->hw_addr[0]) >> 8) & 0xff,
1434                  (readl_u(&init->hw_addr[0]) >> 16) & 0xff,
1435                  (readl_u(&init->hw_addr[0]) >> 24) & 0xff,
1436                  (readl_u(&init->hw_addr[1]) >> 0) & 0xff,
1437                  (readl_u(&init->hw_addr[1]) >> 8) & 0xff,
1438                  (readl_u(&init->hw_addr[1]) >> 16) & 0xff,
1439                  (readl_u(&init->hw_addr[1]) >> 24) & 0xff);
1440         pr_debug("      def_t_req: %u\n", readl_u(&init->def_t_req));
1441         pr_debug("        def_tvx: %u\n", readl_u(&init->def_tvx));
1442         pr_debug("      def_t_max: %u\n", readl_u(&init->def_t_max));
1443         pr_debug("  lem_threshold: %u\n", readl_u(&init->lem_threshold));
1444         /* Don't bother swapping, see above. */
1445         pr_debug(" def_station_id: 0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
1446                  (readl_u(&init->def_station_id[0]) >> 0) & 0xff,
1447                  (readl_u(&init->def_station_id[0]) >> 8) & 0xff,
1448                  (readl_u(&init->def_station_id[0]) >> 16) & 0xff,
1449                  (readl_u(&init->def_station_id[0]) >> 24) & 0xff,
1450                  (readl_u(&init->def_station_id[1]) >> 0) & 0xff,
1451                  (readl_u(&init->def_station_id[1]) >> 8) & 0xff,
1452                  (readl_u(&init->def_station_id[1]) >> 16) & 0xff,
1453                  (readl_u(&init->def_station_id[1]) >> 24) & 0xff);
1454         pr_debug("   pmd_type_alt: %u\n", readl_u(&init->pmd_type_alt));
1455         pr_debug("        smt_ver: %u\n", readl_u(&init->smt_ver));
1456         pr_debug(" rtoken_timeout: %u\n", readl_u(&init->rtoken_timeout));
1457         pr_debug("    ring_purger: %u\n", readl_u(&init->ring_purger));
1458         pr_debug("    smt_ver_max: %u\n", readl_u(&init->smt_ver_max));
1459         pr_debug("    smt_ver_min: %u\n", readl_u(&init->smt_ver_min));
1460         pr_debug("       pmd_type: %u\n", readl_u(&init->pmd_type));
1461
1462         pr_info("%s: model %s, address %pMF\n",
1463                 fp->name,
1464                 pmd_type == FZA_PMD_TYPE_TW ?
1465                         "700-C (DEFZA-CA), ThinWire PMD selected" :
1466                         pmd_type == FZA_PMD_TYPE_STP ?
1467                                 "700-C (DEFZA-CA), STP PMD selected" :
1468                                 "700 (DEFZA-AA), MMF PMD",
1469                 dev->dev_addr);
1470         pr_info("%s: ROM rev. %.4s, firmware rev. %.4s, RMC rev. %.4s, "
1471                 "SMT ver. %u\n", fp->name, rom_rev, fw_rev, rmc_rev, smt_ver);
1472
1473         /* Now that we fetched initial parameters just shut the interface
1474          * until opened.
1475          */
1476         ret = fza_close(dev);
1477         if (ret != 0)
1478                 goto err_out_irq;
1479
1480         /* The FZA-specific entries in the device structure. */
1481         dev->netdev_ops = &netdev_ops;
1482
1483         ret = register_netdev(dev);
1484         if (ret != 0)
1485                 goto err_out_irq;
1486
1487         pr_info("%s: registered as %s\n", fp->name, dev->name);
1488         fp->name = (const char *)dev->name;
1489
1490         get_device(bdev);
1491         return 0;
1492
1493 err_out_irq:
1494         del_timer_sync(&fp->reset_timer);
1495         fza_do_shutdown(fp);
1496         free_irq(dev->irq, dev);
1497
1498 err_out_map:
1499         iounmap(mmio);
1500
1501 err_out_resource:
1502         release_mem_region(start, len);
1503
1504 err_out_kfree:
1505         free_netdev(dev);
1506
1507         pr_err("%s: initialization failure, aborting!\n", fp->name);
1508         return ret;
1509 }
1510
1511 static int fza_remove(struct device *bdev)
1512 {
1513         struct net_device *dev = dev_get_drvdata(bdev);
1514         struct fza_private *fp = netdev_priv(dev);
1515         struct tc_dev *tdev = to_tc_dev(bdev);
1516         resource_size_t start, len;
1517
1518         put_device(bdev);
1519
1520         unregister_netdev(dev);
1521
1522         del_timer_sync(&fp->reset_timer);
1523         fza_do_shutdown(fp);
1524         free_irq(dev->irq, dev);
1525
1526         iounmap(fp->mmio);
1527
1528         start = tdev->resource.start;
1529         len = tdev->resource.end - start + 1;
1530         release_mem_region(start, len);
1531
1532         free_netdev(dev);
1533
1534         return 0;
1535 }
1536
1537 static struct tc_device_id const fza_tc_table[] = {
1538         { "DEC     ", "PMAF-AA " },
1539         { }
1540 };
1541 MODULE_DEVICE_TABLE(tc, fza_tc_table);
1542
1543 static struct tc_driver fza_driver = {
1544         .id_table       = fza_tc_table,
1545         .driver         = {
1546                 .name   = "defza",
1547                 .bus    = &tc_bus_type,
1548                 .probe  = fza_probe,
1549                 .remove = fza_remove,
1550         },
1551 };
1552
1553 static int fza_init(void)
1554 {
1555         return tc_register_driver(&fza_driver);
1556 }
1557
1558 static void fza_exit(void)
1559 {
1560         tc_unregister_driver(&fza_driver);
1561 }
1562
1563 module_init(fza_init);
1564 module_exit(fza_exit);