Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * PCBIT-D low-layer interface |
| 3 | * |
| 4 | * Copyright (C) 1996 Universidade de Lisboa |
| 5 | * |
| 6 | * Written by Pedro Roque Marques (roque@di.fc.ul.pt) |
| 7 | * |
| 8 | * This software may be used and distributed according to the terms of |
| 9 | * the GNU General Public License, incorporated herein by reference. |
| 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * 19991203 - Fernando Carvalho - takion@superbofh.org |
| 14 | * Hacked to compile with egcs and run with current version of isdn modules |
| 15 | */ |
| 16 | |
| 17 | /* |
| 18 | * Based on documentation provided by Inesc: |
| 19 | * - "Interface com bus do PC para o PCBIT e PCBIT-D", Inesc, Jan 93 |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * TODO: better handling of errors |
| 24 | * re-write/remove debug printks |
| 25 | */ |
| 26 | |
| 27 | #include <linux/sched.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/slab.h> |
| 32 | #include <linux/interrupt.h> |
| 33 | #include <linux/workqueue.h> |
| 34 | #include <linux/mm.h> |
| 35 | #include <linux/skbuff.h> |
| 36 | |
| 37 | #include <linux/isdnif.h> |
| 38 | |
| 39 | #include <asm/system.h> |
| 40 | #include <asm/io.h> |
| 41 | |
| 42 | |
| 43 | #include "pcbit.h" |
| 44 | #include "layer2.h" |
| 45 | #include "edss1.h" |
| 46 | |
| 47 | #undef DEBUG_FRAG |
| 48 | |
| 49 | |
| 50 | |
| 51 | /* |
| 52 | * task queue struct |
| 53 | */ |
| 54 | |
| 55 | |
| 56 | |
| 57 | /* |
| 58 | * Layer 3 packet demultiplexer |
| 59 | * drv.c |
| 60 | */ |
| 61 | |
| 62 | extern void pcbit_l3_receive(struct pcbit_dev *dev, ulong msg, |
| 63 | struct sk_buff *skb, |
| 64 | ushort hdr_len, ushort refnum); |
| 65 | |
| 66 | /* |
| 67 | * Prototypes |
| 68 | */ |
| 69 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | static void pcbit_transmit(struct pcbit_dev *dev); |
| 71 | |
| 72 | static void pcbit_recv_ack(struct pcbit_dev *dev, unsigned char ack); |
| 73 | |
| 74 | static void pcbit_l2_error(struct pcbit_dev *dev); |
| 75 | static void pcbit_l2_active_conf(struct pcbit_dev *dev, u_char info); |
| 76 | static void pcbit_l2_err_recover(unsigned long data); |
| 77 | |
| 78 | static void pcbit_firmware_bug(struct pcbit_dev *dev); |
| 79 | |
| 80 | static __inline__ void |
| 81 | pcbit_sched_delivery(struct pcbit_dev *dev) |
| 82 | { |
| 83 | schedule_work(&dev->qdelivery); |
| 84 | } |
| 85 | |
| 86 | |
| 87 | /* |
| 88 | * Called from layer3 |
| 89 | */ |
| 90 | |
| 91 | int |
| 92 | pcbit_l2_write(struct pcbit_dev *dev, ulong msg, ushort refnum, |
| 93 | struct sk_buff *skb, unsigned short hdr_len) |
| 94 | { |
| 95 | struct frame_buf *frame, |
| 96 | *ptr; |
| 97 | unsigned long flags; |
| 98 | |
| 99 | if (dev->l2_state != L2_RUNNING && dev->l2_state != L2_LOADING) { |
| 100 | dev_kfree_skb(skb); |
| 101 | return -1; |
| 102 | } |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame^] | 103 | if ((frame = kmalloc(sizeof(struct frame_buf), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | GFP_ATOMIC)) == NULL) { |
| 105 | printk(KERN_WARNING "pcbit_2_write: kmalloc failed\n"); |
| 106 | dev_kfree_skb(skb); |
| 107 | return -1; |
| 108 | } |
| 109 | frame->msg = msg; |
| 110 | frame->refnum = refnum; |
| 111 | frame->copied = 0; |
| 112 | frame->hdr_len = hdr_len; |
| 113 | |
| 114 | if (skb) |
| 115 | frame->dt_len = skb->len - hdr_len; |
| 116 | else |
| 117 | frame->dt_len = 0; |
| 118 | |
| 119 | frame->skb = skb; |
| 120 | |
| 121 | frame->next = NULL; |
| 122 | |
| 123 | spin_lock_irqsave(&dev->lock, flags); |
| 124 | |
| 125 | if (dev->write_queue == NULL) { |
| 126 | dev->write_queue = frame; |
| 127 | spin_unlock_irqrestore(&dev->lock, flags); |
| 128 | pcbit_transmit(dev); |
| 129 | } else { |
| 130 | for (ptr = dev->write_queue; ptr->next; ptr = ptr->next); |
| 131 | ptr->next = frame; |
| 132 | |
| 133 | spin_unlock_irqrestore(&dev->lock, flags); |
| 134 | } |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static __inline__ void |
| 139 | pcbit_tx_update(struct pcbit_dev *dev, ushort len) |
| 140 | { |
| 141 | u_char info; |
| 142 | |
| 143 | dev->send_seq = (dev->send_seq + 1) % 8; |
| 144 | |
| 145 | dev->fsize[dev->send_seq] = len; |
| 146 | info = 0; |
| 147 | info |= dev->rcv_seq << 3; |
| 148 | info |= dev->send_seq; |
| 149 | |
| 150 | writeb(info, dev->sh_mem + BANK4); |
| 151 | |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * called by interrupt service routine or by write_2 |
| 156 | */ |
| 157 | |
| 158 | static void |
| 159 | pcbit_transmit(struct pcbit_dev *dev) |
| 160 | { |
| 161 | struct frame_buf *frame = NULL; |
| 162 | unsigned char unacked; |
| 163 | int flen; /* fragment frame length including all headers */ |
| 164 | int free; |
| 165 | int count, |
| 166 | cp_len; |
| 167 | unsigned long flags; |
| 168 | unsigned short tt; |
| 169 | |
| 170 | if (dev->l2_state != L2_RUNNING && dev->l2_state != L2_LOADING) |
| 171 | return; |
| 172 | |
| 173 | unacked = (dev->send_seq + (8 - dev->unack_seq)) & 0x07; |
| 174 | |
| 175 | spin_lock_irqsave(&dev->lock, flags); |
| 176 | |
| 177 | if (dev->free > 16 && dev->write_queue && unacked < 7) { |
| 178 | |
| 179 | if (!dev->w_busy) |
| 180 | dev->w_busy = 1; |
| 181 | else { |
| 182 | spin_unlock_irqrestore(&dev->lock, flags); |
| 183 | return; |
| 184 | } |
| 185 | |
| 186 | |
| 187 | frame = dev->write_queue; |
| 188 | free = dev->free; |
| 189 | |
| 190 | spin_unlock_irqrestore(&dev->lock, flags); |
| 191 | |
| 192 | if (frame->copied == 0) { |
| 193 | |
| 194 | /* Type 0 frame */ |
| 195 | |
| 196 | ulong msg; |
| 197 | |
| 198 | if (frame->skb) |
| 199 | flen = FRAME_HDR_LEN + PREHDR_LEN + frame->skb->len; |
| 200 | else |
| 201 | flen = FRAME_HDR_LEN + PREHDR_LEN; |
| 202 | |
| 203 | if (flen > free) |
| 204 | flen = free; |
| 205 | |
| 206 | msg = frame->msg; |
| 207 | |
| 208 | /* |
| 209 | * Board level 2 header |
| 210 | */ |
| 211 | |
| 212 | pcbit_writew(dev, flen - FRAME_HDR_LEN); |
| 213 | |
| 214 | pcbit_writeb(dev, GET_MSG_CPU(msg)); |
| 215 | |
| 216 | pcbit_writeb(dev, GET_MSG_PROC(msg)); |
| 217 | |
| 218 | /* TH */ |
| 219 | pcbit_writew(dev, frame->hdr_len + PREHDR_LEN); |
| 220 | |
| 221 | /* TD */ |
| 222 | pcbit_writew(dev, frame->dt_len); |
| 223 | |
| 224 | |
| 225 | /* |
| 226 | * Board level 3 fixed-header |
| 227 | */ |
| 228 | |
| 229 | /* LEN = TH */ |
| 230 | pcbit_writew(dev, frame->hdr_len + PREHDR_LEN); |
| 231 | |
| 232 | /* XX */ |
| 233 | pcbit_writew(dev, 0); |
| 234 | |
| 235 | /* C + S */ |
| 236 | pcbit_writeb(dev, GET_MSG_CMD(msg)); |
| 237 | pcbit_writeb(dev, GET_MSG_SCMD(msg)); |
| 238 | |
| 239 | /* NUM */ |
| 240 | pcbit_writew(dev, frame->refnum); |
| 241 | |
| 242 | count = FRAME_HDR_LEN + PREHDR_LEN; |
| 243 | } else { |
| 244 | /* Type 1 frame */ |
| 245 | |
| 246 | flen = 2 + (frame->skb->len - frame->copied); |
| 247 | |
| 248 | if (flen > free) |
| 249 | flen = free; |
| 250 | |
| 251 | /* TT */ |
| 252 | tt = ((ushort) (flen - 2)) | 0x8000U; /* Type 1 */ |
| 253 | pcbit_writew(dev, tt); |
| 254 | |
| 255 | count = 2; |
| 256 | } |
| 257 | |
| 258 | if (frame->skb) { |
| 259 | cp_len = frame->skb->len - frame->copied; |
| 260 | if (cp_len > flen - count) |
| 261 | cp_len = flen - count; |
| 262 | |
| 263 | memcpy_topcbit(dev, frame->skb->data + frame->copied, |
| 264 | cp_len); |
| 265 | frame->copied += cp_len; |
| 266 | } |
| 267 | /* bookkeeping */ |
| 268 | dev->free -= flen; |
| 269 | pcbit_tx_update(dev, flen); |
| 270 | |
| 271 | spin_lock_irqsave(&dev->lock, flags); |
| 272 | |
| 273 | if (frame->skb == NULL || frame->copied == frame->skb->len) { |
| 274 | |
| 275 | dev->write_queue = frame->next; |
| 276 | |
| 277 | if (frame->skb != NULL) { |
| 278 | /* free frame */ |
| 279 | dev_kfree_skb(frame->skb); |
| 280 | } |
| 281 | kfree(frame); |
| 282 | } |
| 283 | dev->w_busy = 0; |
| 284 | spin_unlock_irqrestore(&dev->lock, flags); |
| 285 | } else { |
| 286 | spin_unlock_irqrestore(&dev->lock, flags); |
| 287 | #ifdef DEBUG |
| 288 | printk(KERN_DEBUG "unacked %d free %d write_queue %s\n", |
| 289 | unacked, dev->free, dev->write_queue ? "not empty" : |
| 290 | "empty"); |
| 291 | #endif |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | |
| 296 | /* |
| 297 | * deliver a queued frame to the upper layer |
| 298 | */ |
| 299 | |
| 300 | void |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 301 | pcbit_deliver(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | { |
| 303 | struct frame_buf *frame; |
| 304 | unsigned long flags, msg; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 305 | struct pcbit_dev *dev = |
| 306 | container_of(work, struct pcbit_dev, qdelivery); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
| 308 | spin_lock_irqsave(&dev->lock, flags); |
| 309 | |
| 310 | while ((frame = dev->read_queue)) { |
| 311 | dev->read_queue = frame->next; |
| 312 | spin_unlock_irqrestore(&dev->lock, flags); |
| 313 | |
Jeff Garzik | 76fd020 | 2006-10-11 01:22:25 -0700 | [diff] [blame] | 314 | msg = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | SET_MSG_CPU(msg, 0); |
| 316 | SET_MSG_PROC(msg, 0); |
| 317 | SET_MSG_CMD(msg, frame->skb->data[2]); |
| 318 | SET_MSG_SCMD(msg, frame->skb->data[3]); |
| 319 | |
| 320 | frame->refnum = *((ushort *) frame->skb->data + 4); |
| 321 | frame->msg = *((ulong *) & msg); |
| 322 | |
| 323 | skb_pull(frame->skb, 6); |
| 324 | |
| 325 | pcbit_l3_receive(dev, frame->msg, frame->skb, frame->hdr_len, |
| 326 | frame->refnum); |
| 327 | |
| 328 | kfree(frame); |
| 329 | |
| 330 | spin_lock_irqsave(&dev->lock, flags); |
| 331 | } |
| 332 | |
| 333 | spin_unlock_irqrestore(&dev->lock, flags); |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Reads BANK 2 & Reassembles |
| 338 | */ |
| 339 | |
| 340 | static void |
| 341 | pcbit_receive(struct pcbit_dev *dev) |
| 342 | { |
| 343 | unsigned short tt; |
| 344 | u_char cpu, |
| 345 | proc; |
| 346 | struct frame_buf *frame = NULL; |
| 347 | unsigned long flags; |
| 348 | u_char type1; |
| 349 | |
| 350 | if (dev->l2_state != L2_RUNNING && dev->l2_state != L2_LOADING) |
| 351 | return; |
| 352 | |
| 353 | tt = pcbit_readw(dev); |
| 354 | |
| 355 | if ((tt & 0x7fffU) > 511) { |
| 356 | printk(KERN_INFO "pcbit: invalid frame length -> TT=%04x\n", |
| 357 | tt); |
| 358 | pcbit_l2_error(dev); |
| 359 | return; |
| 360 | } |
| 361 | if (!(tt & 0x8000U)) { /* Type 0 */ |
| 362 | type1 = 0; |
| 363 | |
| 364 | if (dev->read_frame) { |
| 365 | printk(KERN_DEBUG "pcbit_receive: Type 0 frame and read_frame != NULL\n"); |
| 366 | /* discard previous queued frame */ |
| 367 | if (dev->read_frame->skb) |
| 368 | kfree_skb(dev->read_frame->skb); |
| 369 | kfree(dev->read_frame); |
| 370 | dev->read_frame = NULL; |
| 371 | } |
Burman Yan | 41f9693 | 2006-12-08 02:39:35 -0800 | [diff] [blame] | 372 | frame = kzalloc(sizeof(struct frame_buf), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
| 374 | if (frame == NULL) { |
| 375 | printk(KERN_WARNING "kmalloc failed\n"); |
| 376 | return; |
| 377 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | cpu = pcbit_readb(dev); |
| 380 | proc = pcbit_readb(dev); |
| 381 | |
| 382 | |
| 383 | if (cpu != 0x06 && cpu != 0x02) { |
| 384 | printk(KERN_DEBUG "pcbit: invalid cpu value\n"); |
| 385 | kfree(frame); |
| 386 | pcbit_l2_error(dev); |
| 387 | return; |
| 388 | } |
| 389 | /* |
| 390 | * we discard cpu & proc on receiving |
| 391 | * but we read it to update the pointer |
| 392 | */ |
| 393 | |
| 394 | frame->hdr_len = pcbit_readw(dev); |
| 395 | frame->dt_len = pcbit_readw(dev); |
| 396 | |
| 397 | /* |
| 398 | * 0 sized packet |
| 399 | * I don't know if they are an error or not... |
| 400 | * But they are very frequent |
| 401 | * Not documented |
| 402 | */ |
| 403 | |
| 404 | if (frame->hdr_len == 0) { |
| 405 | kfree(frame); |
| 406 | #ifdef DEBUG |
| 407 | printk(KERN_DEBUG "0 sized frame\n"); |
| 408 | #endif |
| 409 | pcbit_firmware_bug(dev); |
| 410 | return; |
| 411 | } |
| 412 | /* sanity check the length values */ |
| 413 | if (frame->hdr_len > 1024 || frame->dt_len > 2048) { |
| 414 | #ifdef DEBUG |
| 415 | printk(KERN_DEBUG "length problem: "); |
| 416 | printk(KERN_DEBUG "TH=%04x TD=%04x\n", |
| 417 | frame->hdr_len, |
| 418 | frame->dt_len); |
| 419 | #endif |
| 420 | pcbit_l2_error(dev); |
| 421 | kfree(frame); |
| 422 | return; |
| 423 | } |
| 424 | /* minimum frame read */ |
| 425 | |
| 426 | frame->skb = dev_alloc_skb(frame->hdr_len + frame->dt_len + |
| 427 | ((frame->hdr_len + 15) & ~15)); |
| 428 | |
| 429 | if (!frame->skb) { |
| 430 | printk(KERN_DEBUG "pcbit_receive: out of memory\n"); |
| 431 | kfree(frame); |
| 432 | return; |
| 433 | } |
| 434 | /* 16 byte alignment for IP */ |
| 435 | if (frame->dt_len) |
| 436 | skb_reserve(frame->skb, (frame->hdr_len + 15) & ~15); |
| 437 | |
| 438 | } else { |
| 439 | /* Type 1 */ |
| 440 | type1 = 1; |
| 441 | tt &= 0x7fffU; |
| 442 | |
| 443 | if (!(frame = dev->read_frame)) { |
| 444 | printk("Type 1 frame and no frame queued\n"); |
| 445 | /* usually after an error: toss frame */ |
| 446 | dev->readptr += tt; |
| 447 | if (dev->readptr > dev->sh_mem + BANK2 + BANKLEN) |
| 448 | dev->readptr -= BANKLEN; |
| 449 | return; |
| 450 | |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | memcpy_frompcbit(dev, skb_put(frame->skb, tt), tt); |
| 455 | |
| 456 | frame->copied += tt; |
| 457 | spin_lock_irqsave(&dev->lock, flags); |
| 458 | if (frame->copied == frame->hdr_len + frame->dt_len) { |
| 459 | |
| 460 | if (type1) { |
| 461 | dev->read_frame = NULL; |
| 462 | } |
| 463 | if (dev->read_queue) { |
| 464 | struct frame_buf *ptr; |
| 465 | for (ptr = dev->read_queue; ptr->next; ptr = ptr->next); |
| 466 | ptr->next = frame; |
| 467 | } else |
| 468 | dev->read_queue = frame; |
| 469 | |
| 470 | } else { |
| 471 | dev->read_frame = frame; |
| 472 | } |
| 473 | spin_unlock_irqrestore(&dev->lock, flags); |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * The board sends 0 sized frames |
| 478 | * They are TDATA_CONFs that get messed up somehow |
| 479 | * gotta send a fake acknowledgment to the upper layer somehow |
| 480 | */ |
| 481 | |
| 482 | static __inline__ void |
| 483 | pcbit_fake_conf(struct pcbit_dev *dev, struct pcbit_chan *chan) |
| 484 | { |
| 485 | isdn_ctrl ictl; |
| 486 | |
| 487 | if (chan->queued) { |
| 488 | chan->queued--; |
| 489 | |
| 490 | ictl.driver = dev->id; |
| 491 | ictl.command = ISDN_STAT_BSENT; |
| 492 | ictl.arg = chan->id; |
| 493 | dev->dev_if->statcallb(&ictl); |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | static void |
| 498 | pcbit_firmware_bug(struct pcbit_dev *dev) |
| 499 | { |
| 500 | struct pcbit_chan *chan; |
| 501 | |
| 502 | chan = dev->b1; |
| 503 | |
| 504 | if (chan->fsm_state == ST_ACTIVE) { |
| 505 | pcbit_fake_conf(dev, chan); |
| 506 | } |
| 507 | chan = dev->b2; |
| 508 | |
| 509 | if (chan->fsm_state == ST_ACTIVE) { |
| 510 | pcbit_fake_conf(dev, chan); |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | irqreturn_t |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 515 | pcbit_irq_handler(int interrupt, void *devptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | { |
| 517 | struct pcbit_dev *dev; |
| 518 | u_char info, |
| 519 | ack_seq, |
| 520 | read_seq; |
| 521 | |
| 522 | dev = (struct pcbit_dev *) devptr; |
| 523 | |
| 524 | if (!dev) { |
| 525 | printk(KERN_WARNING "pcbit_irq_handler: wrong device\n"); |
| 526 | return IRQ_NONE; |
| 527 | } |
| 528 | if (dev->interrupt) { |
| 529 | printk(KERN_DEBUG "pcbit: reentering interrupt hander\n"); |
| 530 | return IRQ_HANDLED; |
| 531 | } |
| 532 | dev->interrupt = 1; |
| 533 | |
| 534 | info = readb(dev->sh_mem + BANK3); |
| 535 | |
| 536 | if (dev->l2_state == L2_STARTING || dev->l2_state == L2_ERROR) { |
| 537 | pcbit_l2_active_conf(dev, info); |
| 538 | dev->interrupt = 0; |
| 539 | return IRQ_HANDLED; |
| 540 | } |
| 541 | if (info & 0x40U) { /* E bit set */ |
| 542 | #ifdef DEBUG |
| 543 | printk(KERN_DEBUG "pcbit_irq_handler: E bit on\n"); |
| 544 | #endif |
| 545 | pcbit_l2_error(dev); |
| 546 | dev->interrupt = 0; |
| 547 | return IRQ_HANDLED; |
| 548 | } |
| 549 | if (dev->l2_state != L2_RUNNING && dev->l2_state != L2_LOADING) { |
| 550 | dev->interrupt = 0; |
| 551 | return IRQ_HANDLED; |
| 552 | } |
| 553 | ack_seq = (info >> 3) & 0x07U; |
| 554 | read_seq = (info & 0x07U); |
| 555 | |
| 556 | dev->interrupt = 0; |
| 557 | |
| 558 | if (read_seq != dev->rcv_seq) { |
| 559 | while (read_seq != dev->rcv_seq) { |
| 560 | pcbit_receive(dev); |
| 561 | dev->rcv_seq = (dev->rcv_seq + 1) % 8; |
| 562 | } |
| 563 | pcbit_sched_delivery(dev); |
| 564 | } |
| 565 | if (ack_seq != dev->unack_seq) { |
| 566 | pcbit_recv_ack(dev, ack_seq); |
| 567 | } |
| 568 | info = dev->rcv_seq << 3; |
| 569 | info |= dev->send_seq; |
| 570 | |
| 571 | writeb(info, dev->sh_mem + BANK4); |
| 572 | return IRQ_HANDLED; |
| 573 | } |
| 574 | |
| 575 | |
| 576 | static void |
| 577 | pcbit_l2_active_conf(struct pcbit_dev *dev, u_char info) |
| 578 | { |
| 579 | u_char state; |
| 580 | |
| 581 | state = dev->l2_state; |
| 582 | |
| 583 | #ifdef DEBUG |
| 584 | printk(KERN_DEBUG "layer2_active_confirm\n"); |
| 585 | #endif |
| 586 | |
| 587 | |
| 588 | if (info & 0x80U) { |
| 589 | dev->rcv_seq = info & 0x07U; |
| 590 | dev->l2_state = L2_RUNNING; |
| 591 | } else |
| 592 | dev->l2_state = L2_DOWN; |
| 593 | |
| 594 | if (state == L2_STARTING) |
| 595 | wake_up_interruptible(&dev->set_running_wq); |
| 596 | |
| 597 | if (state == L2_ERROR && dev->l2_state == L2_RUNNING) { |
| 598 | pcbit_transmit(dev); |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | static void |
| 603 | pcbit_l2_err_recover(unsigned long data) |
| 604 | { |
| 605 | |
| 606 | struct pcbit_dev *dev; |
| 607 | struct frame_buf *frame; |
| 608 | |
| 609 | dev = (struct pcbit_dev *) data; |
| 610 | |
| 611 | del_timer(&dev->error_recover_timer); |
| 612 | if (dev->w_busy || dev->r_busy) { |
| 613 | init_timer(&dev->error_recover_timer); |
| 614 | dev->error_recover_timer.expires = jiffies + ERRTIME; |
| 615 | add_timer(&dev->error_recover_timer); |
| 616 | return; |
| 617 | } |
| 618 | dev->w_busy = dev->r_busy = 1; |
| 619 | |
| 620 | if (dev->read_frame) { |
| 621 | if (dev->read_frame->skb) |
| 622 | kfree_skb(dev->read_frame->skb); |
| 623 | kfree(dev->read_frame); |
| 624 | dev->read_frame = NULL; |
| 625 | } |
| 626 | if (dev->write_queue) { |
| 627 | frame = dev->write_queue; |
| 628 | #ifdef FREE_ON_ERROR |
| 629 | dev->write_queue = dev->write_queue->next; |
| 630 | |
| 631 | if (frame->skb) { |
| 632 | dev_kfree_skb(frame->skb); |
| 633 | } |
| 634 | kfree(frame); |
| 635 | #else |
| 636 | frame->copied = 0; |
| 637 | #endif |
| 638 | } |
| 639 | dev->rcv_seq = dev->send_seq = dev->unack_seq = 0; |
| 640 | dev->free = 511; |
| 641 | dev->l2_state = L2_ERROR; |
| 642 | |
| 643 | /* this is an hack... */ |
| 644 | pcbit_firmware_bug(dev); |
| 645 | |
| 646 | dev->writeptr = dev->sh_mem; |
| 647 | dev->readptr = dev->sh_mem + BANK2; |
| 648 | |
| 649 | writeb((0x80U | ((dev->rcv_seq & 0x07) << 3) | (dev->send_seq & 0x07)), |
| 650 | dev->sh_mem + BANK4); |
| 651 | dev->w_busy = dev->r_busy = 0; |
| 652 | |
| 653 | } |
| 654 | |
| 655 | static void |
| 656 | pcbit_l2_error(struct pcbit_dev *dev) |
| 657 | { |
| 658 | if (dev->l2_state == L2_RUNNING) { |
| 659 | |
| 660 | printk(KERN_INFO "pcbit: layer 2 error\n"); |
| 661 | |
| 662 | #ifdef DEBUG |
| 663 | log_state(dev); |
| 664 | #endif |
| 665 | |
| 666 | dev->l2_state = L2_DOWN; |
| 667 | |
| 668 | init_timer(&dev->error_recover_timer); |
| 669 | dev->error_recover_timer.function = &pcbit_l2_err_recover; |
| 670 | dev->error_recover_timer.data = (ulong) dev; |
| 671 | dev->error_recover_timer.expires = jiffies + ERRTIME; |
| 672 | add_timer(&dev->error_recover_timer); |
| 673 | } |
| 674 | } |
| 675 | |
| 676 | /* |
| 677 | * Description: |
| 678 | * if board acks frames |
| 679 | * update dev->free |
| 680 | * call pcbit_transmit to write possible queued frames |
| 681 | */ |
| 682 | |
| 683 | static void |
| 684 | pcbit_recv_ack(struct pcbit_dev *dev, unsigned char ack) |
| 685 | { |
| 686 | int i, |
| 687 | count; |
| 688 | int unacked; |
| 689 | |
| 690 | unacked = (dev->send_seq + (8 - dev->unack_seq)) & 0x07; |
| 691 | |
| 692 | /* dev->unack_seq < ack <= dev->send_seq; */ |
| 693 | |
| 694 | if (unacked) { |
| 695 | |
| 696 | if (dev->send_seq > dev->unack_seq) { |
| 697 | if (ack <= dev->unack_seq || ack > dev->send_seq) { |
| 698 | printk(KERN_DEBUG |
| 699 | "layer 2 ack unacceptable - dev %d", |
| 700 | dev->id); |
| 701 | |
| 702 | pcbit_l2_error(dev); |
| 703 | } else if (ack > dev->send_seq && ack <= dev->unack_seq) { |
| 704 | printk(KERN_DEBUG |
| 705 | "layer 2 ack unacceptable - dev %d", |
| 706 | dev->id); |
| 707 | pcbit_l2_error(dev); |
| 708 | } |
| 709 | } |
| 710 | /* ack is acceptable */ |
| 711 | |
| 712 | |
| 713 | i = dev->unack_seq; |
| 714 | |
| 715 | do { |
| 716 | dev->unack_seq = i = (i + 1) % 8; |
| 717 | dev->free += dev->fsize[i]; |
| 718 | } while (i != ack); |
| 719 | |
| 720 | count = 0; |
| 721 | while (count < 7 && dev->write_queue) { |
| 722 | u8 lsend_seq = dev->send_seq; |
| 723 | |
| 724 | pcbit_transmit(dev); |
| 725 | |
| 726 | if (dev->send_seq == lsend_seq) |
| 727 | break; |
| 728 | count++; |
| 729 | } |
| 730 | } else |
| 731 | printk(KERN_DEBUG "recv_ack: unacked = 0\n"); |
| 732 | } |