drivers/ieee1394/video1394.c

   1 /*
   2  * video1394.c - video driver for OHCI 1394 boards
   3  * Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
   4  *                        Peter Schlaile <udbz@rz.uni-karlsruhe.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  *
  20  * NOTES:
  21  *
  22  * jds -- add private data to file to keep track of iso contexts associated
  23  * with each open -- so release won't kill all iso transfers.
  24  *
  25  * Damien Douxchamps: Fix failure when the number of DMA pages per frame is
  26  * one.
  27  *
  28  * ioctl return codes:
  29  * EFAULT is only for invalid address for the argp
  30  * EINVAL for out of range values
  31  * EBUSY when trying to use an already used resource
  32  * ESRCH when trying to free/stop a not used resource
  33  * EAGAIN for resource allocation failure that could perhaps succeed later
  34  * ENOTTY for unsupported ioctl request
  35  *
  36  */
  37
  38 #include <linux/config.h>
  39 #include <linux/kernel.h>
  40 #include <linux/list.h>
  41 #include <linux/slab.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/wait.h>
  44 #include <linux/errno.h>
  45 #include <linux/module.h>
  46 #include <linux/init.h>
  47 #include <linux/pci.h>
  48 #include <linux/fs.h>
  49 #include <linux/poll.h>
  50 #include <linux/smp_lock.h>
  51 #include <linux/delay.h>
  52 #include <linux/devfs_fs_kernel.h>
  53 #include <linux/bitops.h>
  54 #include <linux/types.h>
  55 #include <linux/vmalloc.h>
  56 #include <linux/timex.h>
  57 #include <linux/mm.h>
  58 #include <linux/ioctl32.h>
  59 #include <linux/compat.h>
  60 #include <linux/cdev.h>
  61
  62 #include "ieee1394.h"
  63 #include "ieee1394_types.h"
  64 #include "hosts.h"
  65 #include "ieee1394_core.h"
  66 #include "highlevel.h"
  67 #include "video1394.h"
  68 #include "nodemgr.h"
  69 #include "dma.h"
  70
  71 #include "ohci1394.h"
  72
  73 #define ISO_CHANNELS 64
  74
  75 #ifndef virt_to_page
  76 #define virt_to_page(x) MAP_NR(x)
  77 #endif
  78
  79 #ifndef vmalloc_32
  80 #define vmalloc_32(x) vmalloc(x)
  81 #endif
  82
  83 struct it_dma_prg {
  84         struct dma_cmd begin;
  85         quadlet_t data[4];
  86         struct dma_cmd end;
  87         quadlet_t pad[4]; /* FIXME: quick hack for memory alignment */
  88 };
  89
  90 struct dma_iso_ctx {
  91         struct ti_ohci *ohci;
  92         int type; /* OHCI_ISO_TRANSMIT or OHCI_ISO_RECEIVE */
  93         struct ohci1394_iso_tasklet iso_tasklet;
  94         int channel;
  95         int ctx;
  96         int last_buffer;
  97         int * next_buffer;  /* For ISO Transmit of video packets
  98                                to write the correct SYT field
  99                                into the next block */
 100         unsigned int num_desc;
 101         unsigned int buf_size;
 102         unsigned int frame_size;
 103         unsigned int packet_size;
 104         unsigned int left_size;
 105         unsigned int nb_cmd;
 106
 107         struct dma_region dma;
 108
 109         struct dma_prog_region *prg_reg;
 110
 111         struct dma_cmd **ir_prg;
 112         struct it_dma_prg **it_prg;
 113
 114         unsigned int *buffer_status;
 115         struct timeval *buffer_time; /* time when the buffer was received */
 116         unsigned int *last_used_cmd; /* For ISO Transmit with
 117                                         variable sized packets only ! */
 118         int ctrlClear;
 119         int ctrlSet;
 120         int cmdPtr;
 121         int ctxMatch;
 122         wait_queue_head_t waitq;
 123         spinlock_t lock;
 124         unsigned int syt_offset;
 125         int flags;
 126
 127         struct list_head link;
 128 };
 129
 130
 131 struct file_ctx {
 132         struct ti_ohci *ohci;
 133         struct list_head context_list;
 134         struct dma_iso_ctx *current_ctx;
 135 };
 136
 137 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 138 #define VIDEO1394_DEBUG
 139 #endif
 140
 141 #ifdef DBGMSG
 142 #undef DBGMSG
 143 #endif
 144
 145 #ifdef VIDEO1394_DEBUG
 146 #define DBGMSG(card, fmt, args...) \
 147 printk(KERN_INFO "video1394_%d: " fmt "\n" , card , ## args)
 148 #else
 149 #define DBGMSG(card, fmt, args...)
 150 #endif
 151
 152 /* print general (card independent) information */
 153 #define PRINT_G(level, fmt, args...) \
 154 printk(level "video1394: " fmt "\n" , ## args)
 155
 156 /* print card specific information */
 157 #define PRINT(level, card, fmt, args...) \
 158 printk(level "video1394_%d: " fmt "\n" , card , ## args)
 159
 160 static void wakeup_dma_ir_ctx(unsigned long l);
 161 static void wakeup_dma_it_ctx(unsigned long l);
 162
 163 static struct hpsb_highlevel video1394_highlevel;
 164
 165 static int free_dma_iso_ctx(struct dma_iso_ctx *d)
 166 {
 167         int i;
 168
 169         DBGMSG(d->ohci->host->id, "Freeing dma_iso_ctx %d", d->ctx);
 170
 171         ohci1394_stop_context(d->ohci, d->ctrlClear, NULL);
 172         if (d->iso_tasklet.link.next != NULL)
 173                 ohci1394_unregister_iso_tasklet(d->ohci, &d->iso_tasklet);
 174
 175         dma_region_free(&d->dma);
 176
 177         if (d->prg_reg) {
 178                 for (i = 0; i < d->num_desc; i++)
 179                         dma_prog_region_free(&d->prg_reg[i]);
 180                 kfree(d->prg_reg);
 181         }
 182
 183         if (d->ir_prg)
 184                 kfree(d->ir_prg);
 185
 186         if (d->it_prg)
 187                 kfree(d->it_prg);
 188
 189         if (d->buffer_status)
 190                 kfree(d->buffer_status);
 191         if (d->buffer_time)
 192                 kfree(d->buffer_time);
 193         if (d->last_used_cmd)
 194                 kfree(d->last_used_cmd);
 195         if (d->next_buffer)
 196                 kfree(d->next_buffer);
 197
 198         list_del(&d->link);
 199
 200         kfree(d);
 201
 202         return 0;
 203 }
 204
 205 static struct dma_iso_ctx *
 206 alloc_dma_iso_ctx(struct ti_ohci *ohci, int type, int num_desc,
 207                   int buf_size, int channel, unsigned int packet_size)
 208 {
 209         struct dma_iso_ctx *d;
 210         int i;
 211
 212         d = kmalloc(sizeof(struct dma_iso_ctx), GFP_KERNEL);
 213         if (d == NULL) {
 214                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma_iso_ctx");
 215                 return NULL;
 216         }
 217
 218         memset(d, 0, sizeof *d);
 219
 220         d->ohci = ohci;
 221         d->type = type;
 222         d->channel = channel;
 223         d->num_desc = num_desc;
 224         d->frame_size = buf_size;
 225         d->buf_size = PAGE_ALIGN(buf_size);
 226         d->last_buffer = -1;
 227         INIT_LIST_HEAD(&d->link);
 228         init_waitqueue_head(&d->waitq);
 229
 230         /* Init the regions for easy cleanup */
 231         dma_region_init(&d->dma);
 232
 233         if (dma_region_alloc(&d->dma, d->num_desc * d->buf_size, ohci->dev,
 234                              PCI_DMA_BIDIRECTIONAL)) {
 235                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma buffer");
 236                 free_dma_iso_ctx(d);
 237                 return NULL;
 238         }
 239
 240         if (type == OHCI_ISO_RECEIVE)
 241                 ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
 242                                           wakeup_dma_ir_ctx,
 243                                           (unsigned long) d);
 244         else
 245                 ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
 246                                           wakeup_dma_it_ctx,
 247                                           (unsigned long) d);
 248
 249         if (ohci1394_register_iso_tasklet(ohci, &d->iso_tasklet) < 0) {
 250                 PRINT(KERN_ERR, ohci->host->id, "no free iso %s contexts",
 251                       type == OHCI_ISO_RECEIVE ? "receive" : "transmit");
 252                 free_dma_iso_ctx(d);
 253                 return NULL;
 254         }
 255         d->ctx = d->iso_tasklet.context;
 256
 257         d->prg_reg = kmalloc(d->num_desc * sizeof(struct dma_prog_region),
 258                         GFP_KERNEL);
 259         if (d->prg_reg == NULL) {
 260                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate ir prg regs");
 261                 free_dma_iso_ctx(d);
 262                 return NULL;
 263         }
 264         /* Makes for easier cleanup */
 265         for (i = 0; i < d->num_desc; i++)
 266                 dma_prog_region_init(&d->prg_reg[i]);
 267
 268         if (type == OHCI_ISO_RECEIVE) {
 269                 d->ctrlSet = OHCI1394_IsoRcvContextControlSet+32*d->ctx;
 270                 d->ctrlClear = OHCI1394_IsoRcvContextControlClear+32*d->ctx;
 271                 d->cmdPtr = OHCI1394_IsoRcvCommandPtr+32*d->ctx;
 272                 d->ctxMatch = OHCI1394_IsoRcvContextMatch+32*d->ctx;
 273
 274                 d->ir_prg = kmalloc(d->num_desc * sizeof(struct dma_cmd *),
 275                                     GFP_KERNEL);
 276
 277                 if (d->ir_prg == NULL) {
 278                         PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
 279                         free_dma_iso_ctx(d);
 280                         return NULL;
 281                 }
 282                 memset(d->ir_prg, 0, d->num_desc * sizeof(struct dma_cmd *));
 283
 284                 d->nb_cmd = d->buf_size / PAGE_SIZE + 1;
 285                 d->left_size = (d->frame_size % PAGE_SIZE) ?
 286                         d->frame_size % PAGE_SIZE : PAGE_SIZE;
 287
 288                 for (i = 0;i < d->num_desc; i++) {
 289                         if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
 290                                                   sizeof(struct dma_cmd), ohci->dev)) {
 291                                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
 292                                 free_dma_iso_ctx(d);
 293                                 return NULL;
 294                         }
 295                         d->ir_prg[i] = (struct dma_cmd *)d->prg_reg[i].kvirt;
 296                 }
 297
 298         } else {  /* OHCI_ISO_TRANSMIT */
 299                 d->ctrlSet = OHCI1394_IsoXmitContextControlSet+16*d->ctx;
 300                 d->ctrlClear = OHCI1394_IsoXmitContextControlClear+16*d->ctx;
 301                 d->cmdPtr = OHCI1394_IsoXmitCommandPtr+16*d->ctx;
 302
 303                 d->it_prg = kmalloc(d->num_desc * sizeof(struct it_dma_prg *),
 304                                     GFP_KERNEL);
 305
 306                 if (d->it_prg == NULL) {
 307                         PRINT(KERN_ERR, ohci->host->id,
 308                               "Failed to allocate dma it prg");
 309                         free_dma_iso_ctx(d);
 310                         return NULL;
 311                 }
 312                 memset(d->it_prg, 0, d->num_desc*sizeof(struct it_dma_prg *));
 313
 314                 d->packet_size = packet_size;
 315
 316                 if (PAGE_SIZE % packet_size || packet_size>4096) {
 317                         PRINT(KERN_ERR, ohci->host->id,
 318                               "Packet size %d (page_size: %ld) "
 319                               "not yet supported\n",
 320                               packet_size, PAGE_SIZE);
 321                         free_dma_iso_ctx(d);
 322                         return NULL;
 323                 }
 324
 325                 d->nb_cmd = d->frame_size / d->packet_size;
 326                 if (d->frame_size % d->packet_size) {
 327                         d->nb_cmd++;
 328                         d->left_size = d->frame_size % d->packet_size;
 329                 } else
 330                         d->left_size = d->packet_size;
 331
 332                 for (i = 0; i < d->num_desc; i++) {
 333                         if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
 334                                                 sizeof(struct it_dma_prg), ohci->dev)) {
 335                                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma it prg");
 336                                 free_dma_iso_ctx(d);
 337                                 return NULL;
 338                         }
 339                         d->it_prg[i] = (struct it_dma_prg *)d->prg_reg[i].kvirt;
 340                 }
 341         }
 342
 343         d->buffer_status = kmalloc(d->num_desc * sizeof(unsigned int),
 344                                    GFP_KERNEL);
 345         d->buffer_time = kmalloc(d->num_desc * sizeof(struct timeval),
 346                                    GFP_KERNEL);
 347         d->last_used_cmd = kmalloc(d->num_desc * sizeof(unsigned int),
 348                                    GFP_KERNEL);
 349         d->next_buffer = kmalloc(d->num_desc * sizeof(int),
 350                                  GFP_KERNEL);
 351
 352         if (d->buffer_status == NULL) {
 353                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate buffer_status");
 354                 free_dma_iso_ctx(d);
 355                 return NULL;
 356         }
 357         if (d->buffer_time == NULL) {
 358                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate buffer_time");
 359                 free_dma_iso_ctx(d);
 360                 return NULL;
 361         }
 362         if (d->last_used_cmd == NULL) {
 363                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate last_used_cmd");
 364                 free_dma_iso_ctx(d);
 365                 return NULL;
 366         }
 367         if (d->next_buffer == NULL) {
 368                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate next_buffer");
 369                 free_dma_iso_ctx(d);
 370                 return NULL;
 371         }
 372         memset(d->buffer_status, 0, d->num_desc * sizeof(unsigned int));
 373         memset(d->buffer_time, 0, d->num_desc * sizeof(struct timeval));
 374         memset(d->last_used_cmd, 0, d->num_desc * sizeof(unsigned int));
 375         memset(d->next_buffer, -1, d->num_desc * sizeof(int));
 376
 377         spin_lock_init(&d->lock);
 378
 379         PRINT(KERN_INFO, ohci->host->id, "Iso %s DMA: %d buffers "
 380               "of size %d allocated for a frame size %d, each with %d prgs",
 381               (type == OHCI_ISO_RECEIVE) ? "receive" : "transmit",
 382               d->num_desc, d->buf_size, d->frame_size, d->nb_cmd);
 383
 384         return d;
 385 }
 386
 387 static void reset_ir_status(struct dma_iso_ctx *d, int n)
 388 {
 389         int i;
 390         d->ir_prg[n][0].status = cpu_to_le32(4);
 391         d->ir_prg[n][1].status = cpu_to_le32(PAGE_SIZE-4);
 392         for (i = 2; i < d->nb_cmd - 1; i++)
 393                 d->ir_prg[n][i].status = cpu_to_le32(PAGE_SIZE);
 394         d->ir_prg[n][i].status = cpu_to_le32(d->left_size);
 395 }
 396
 397 static void initialize_dma_ir_prg(struct dma_iso_ctx *d, int n, int flags)
 398 {
 399         struct dma_cmd *ir_prg = d->ir_prg[n];
 400         struct dma_prog_region *ir_reg = &d->prg_reg[n];
 401         unsigned long buf = (unsigned long)d->dma.kvirt + n * d->buf_size;
 402         int i;
 403
 404         /* the first descriptor will read only 4 bytes */
 405         ir_prg[0].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 406                 DMA_CTL_BRANCH | 4);
 407
 408         /* set the sync flag */
 409         if (flags & VIDEO1394_SYNC_FRAMES)
 410                 ir_prg[0].control |= cpu_to_le32(DMA_CTL_WAIT);
 411
 412         ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
 413                                 (unsigned long)d->dma.kvirt));
 414         ir_prg[0].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
 415                                         1 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
 416
 417         /* If there is *not* only one DMA page per frame (hence, d->nb_cmd==2) */
 418         if (d->nb_cmd > 2) {
 419                 /* The second descriptor will read PAGE_SIZE-4 bytes */
 420                 ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 421                                                 DMA_CTL_BRANCH | (PAGE_SIZE-4));
 422                 ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf + 4) -
 423                                                 (unsigned long)d->dma.kvirt));
 424                 ir_prg[1].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
 425                                                       2 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
 426
 427                 for (i = 2; i < d->nb_cmd - 1; i++) {
 428                         ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 429                                                         DMA_CTL_BRANCH | PAGE_SIZE);
 430                         ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 431                                                         (buf+(i-1)*PAGE_SIZE) -
 432                                                         (unsigned long)d->dma.kvirt));
 433
 434                         ir_prg[i].branchAddress =
 435                                 cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
 436                                             (i + 1) * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
 437                 }
 438
 439                 /* The last descriptor will generate an interrupt */
 440                 ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 441                                                 DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
 442                 ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 443                                                 (buf+(i-1)*PAGE_SIZE) -
 444                                                 (unsigned long)d->dma.kvirt));
 445         } else {
 446                 /* Only one DMA page is used. Read d->left_size immediately and */
 447                 /* generate an interrupt as this is also the last page. */
 448                 ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 449                                                 DMA_CTL_IRQ | DMA_CTL_BRANCH | (d->left_size-4));
 450                 ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 451                                                 (buf + 4) - (unsigned long)d->dma.kvirt));
 452         }
 453 }
 454
 455 static void initialize_dma_ir_ctx(struct dma_iso_ctx *d, int tag, int flags)
 456 {
 457         struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
 458         int i;
 459
 460         d->flags = flags;
 461
 462         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
 463
 464         for (i=0;i<d->num_desc;i++) {
 465                 initialize_dma_ir_prg(d, i, flags);
 466                 reset_ir_status(d, i);
 467         }
 468
 469         /* reset the ctrl register */
 470         reg_write(ohci, d->ctrlClear, 0xf0000000);
 471
 472         /* Set bufferFill */
 473         reg_write(ohci, d->ctrlSet, 0x80000000);
 474
 475         /* Set isoch header */
 476         if (flags & VIDEO1394_INCLUDE_ISO_HEADERS)
 477                 reg_write(ohci, d->ctrlSet, 0x40000000);
 478
 479         /* Set the context match register to match on all tags,
 480            sync for sync tag, and listen to d->channel */
 481         reg_write(ohci, d->ctxMatch, 0xf0000000|((tag&0xf)<<8)|d->channel);
 482
 483         /* Set up isoRecvIntMask to generate interrupts */
 484         reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1<<d->ctx);
 485 }
 486
 487 /* find which context is listening to this channel */
 488 static struct dma_iso_ctx *
 489 find_ctx(struct list_head *list, int type, int channel)
 490 {
 491         struct dma_iso_ctx *ctx;
 492
 493         list_for_each_entry(ctx, list, link) {
 494                 if (ctx->type == type && ctx->channel == channel)
 495                         return ctx;
 496         }
 497
 498         return NULL;
 499 }
 500
 501 static void wakeup_dma_ir_ctx(unsigned long l)
 502 {
 503         struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
 504         int i;
 505
 506         spin_lock(&d->lock);
 507
 508         for (i = 0; i < d->num_desc; i++) {
 509                 if (d->ir_prg[i][d->nb_cmd-1].status & cpu_to_le32(0xFFFF0000)) {
 510                         reset_ir_status(d, i);
 511                         d->buffer_status[i] = VIDEO1394_BUFFER_READY;
 512                         do_gettimeofday(&d->buffer_time[i]);
 513                 }
 514         }
 515
 516         spin_unlock(&d->lock);
 517
 518         if (waitqueue_active(&d->waitq))
 519                 wake_up_interruptible(&d->waitq);
 520 }
 521
 522 static inline void put_timestamp(struct ti_ohci *ohci, struct dma_iso_ctx * d,
 523                                  int n)
 524 {
 525         unsigned char* buf = d->dma.kvirt + n * d->buf_size;
 526         u32 cycleTimer;
 527         u32 timeStamp;
 528
 529         if (n == -1) {
 530           return;
 531         }
 532
 533         cycleTimer = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
 534
 535         timeStamp = ((cycleTimer & 0x0fff) + d->syt_offset); /* 11059 = 450 us */
 536         timeStamp = (timeStamp % 3072 + ((timeStamp / 3072) << 12)
 537                 + (cycleTimer & 0xf000)) & 0xffff;
 538
 539         buf[6] = timeStamp >> 8;
 540         buf[7] = timeStamp & 0xff;
 541
 542     /* if first packet is empty packet, then put timestamp into the next full one too */
 543     if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
 544             buf += d->packet_size;
 545         buf[6] = timeStamp >> 8;
 546             buf[7] = timeStamp & 0xff;
 547         }
 548
 549     /* do the next buffer frame too in case of irq latency */
 550         n = d->next_buffer[n];
 551         if (n == -1) {
 552           return;
 553         }
 554         buf = d->dma.kvirt + n * d->buf_size;
 555
 556         timeStamp += (d->last_used_cmd[n] << 12) & 0xffff;
 557
 558         buf[6] = timeStamp >> 8;
 559         buf[7] = timeStamp & 0xff;
 560
 561     /* if first packet is empty packet, then put timestamp into the next full one too */
 562     if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
 563             buf += d->packet_size;
 564         buf[6] = timeStamp >> 8;
 565             buf[7] = timeStamp & 0xff;
 566         }
 567
 568 #if 0
 569         printk("curr: %d, next: %d, cycleTimer: %08x timeStamp: %08x\n",
 570                curr, n, cycleTimer, timeStamp);
 571 #endif
 572 }
 573
 574 static void wakeup_dma_it_ctx(unsigned long l)
 575 {
 576         struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
 577         struct ti_ohci *ohci = d->ohci;
 578         int i;
 579
 580         spin_lock(&d->lock);
 581
 582         for (i = 0; i < d->num_desc; i++) {
 583                 if (d->it_prg[i][d->last_used_cmd[i]].end.status &
 584                     cpu_to_le32(0xFFFF0000)) {
 585                         int next = d->next_buffer[i];
 586                         put_timestamp(ohci, d, next);
 587                         d->it_prg[i][d->last_used_cmd[i]].end.status = 0;
 588                         d->buffer_status[i] = VIDEO1394_BUFFER_READY;
 589                 }
 590         }
 591
 592         spin_unlock(&d->lock);
 593
 594         if (waitqueue_active(&d->waitq))
 595                 wake_up_interruptible(&d->waitq);
 596 }
 597
 598 static void initialize_dma_it_prg(struct dma_iso_ctx *d, int n, int sync_tag)
 599 {
 600         struct it_dma_prg *it_prg = d->it_prg[n];
 601         struct dma_prog_region *it_reg = &d->prg_reg[n];
 602         unsigned long buf = (unsigned long)d->dma.kvirt + n * d->buf_size;
 603         int i;
 604         d->last_used_cmd[n] = d->nb_cmd - 1;
 605         for (i=0;i<d->nb_cmd;i++) {
 606
 607                 it_prg[i].begin.control = cpu_to_le32(DMA_CTL_OUTPUT_MORE |
 608                         DMA_CTL_IMMEDIATE | 8) ;
 609                 it_prg[i].begin.address = 0;
 610
 611                 it_prg[i].begin.status = 0;
 612
 613                 it_prg[i].data[0] = cpu_to_le32(
 614                         (IEEE1394_SPEED_100 << 16)
 615                         | (/* tag */ 1 << 14)
 616                         | (d->channel << 8)
 617                         | (TCODE_ISO_DATA << 4));
 618                 if (i==0) it_prg[i].data[0] |= cpu_to_le32(sync_tag);
 619                 it_prg[i].data[1] = cpu_to_le32(d->packet_size << 16);
 620                 it_prg[i].data[2] = 0;
 621                 it_prg[i].data[3] = 0;
 622
 623                 it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST |
 624                                              DMA_CTL_BRANCH);
 625                 it_prg[i].end.address =
 626                         cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf+i*d->packet_size) -
 627                                                 (unsigned long)d->dma.kvirt));
 628
 629                 if (i<d->nb_cmd-1) {
 630                         it_prg[i].end.control |= cpu_to_le32(d->packet_size);
 631                         it_prg[i].begin.branchAddress =
 632                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
 633                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
 634                         it_prg[i].end.branchAddress =
 635                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
 636                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
 637                 } else {
 638                         /* the last prg generates an interrupt */
 639                         it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
 640                                 DMA_CTL_IRQ | d->left_size);
 641                         /* the last prg doesn't branch */
 642                         it_prg[i].begin.branchAddress = 0;
 643                         it_prg[i].end.branchAddress = 0;
 644                 }
 645                 it_prg[i].end.status = 0;
 646         }
 647 }
 648
 649 static void initialize_dma_it_prg_var_packet_queue(
 650         struct dma_iso_ctx *d, int n, unsigned int * packet_sizes,
 651         struct ti_ohci *ohci)
 652 {
 653         struct it_dma_prg *it_prg = d->it_prg[n];
 654         struct dma_prog_region *it_reg = &d->prg_reg[n];
 655         int i;
 656
 657 #if 0
 658         if (n != -1) {
 659                 put_timestamp(ohci, d, n);
 660         }
 661 #endif
 662         d->last_used_cmd[n] = d->nb_cmd - 1;
 663
 664         for (i = 0; i < d->nb_cmd; i++) {
 665                 unsigned int size;
 666                 if (packet_sizes[i] > d->packet_size) {
 667                         size = d->packet_size;
 668                 } else {
 669                         size = packet_sizes[i];
 670                 }
 671                 it_prg[i].data[1] = cpu_to_le32(size << 16);
 672                 it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST | DMA_CTL_BRANCH);
 673
 674                 if (i < d->nb_cmd-1 && packet_sizes[i+1] != 0) {
 675                         it_prg[i].end.control |= cpu_to_le32(size);
 676                         it_prg[i].begin.branchAddress =
 677                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
 678                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
 679                         it_prg[i].end.branchAddress =
 680                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
 681                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
 682                 } else {
 683                         /* the last prg generates an interrupt */
 684                         it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
 685                                 DMA_CTL_IRQ | size);
 686                         /* the last prg doesn't branch */
 687                         it_prg[i].begin.branchAddress = 0;
 688                         it_prg[i].end.branchAddress = 0;
 689                         d->last_used_cmd[n] = i;
 690                         break;
 691                 }
 692         }
 693 }
 694
 695 static void initialize_dma_it_ctx(struct dma_iso_ctx *d, int sync_tag,
 696                                   unsigned int syt_offset, int flags)
 697 {
 698         struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
 699         int i;
 700
 701         d->flags = flags;
 702         d->syt_offset = (syt_offset == 0 ? 11000 : syt_offset);
 703
 704         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
 705
 706         for (i=0;i<d->num_desc;i++)
 707                 initialize_dma_it_prg(d, i, sync_tag);
 708
 709         /* Set up isoRecvIntMask to generate interrupts */
 710         reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1<<d->ctx);
 711 }
 712
 713 static inline unsigned video1394_buffer_state(struct dma_iso_ctx *d,
 714                                               unsigned int buffer)
 715 {
 716         unsigned long flags;
 717         unsigned int ret;
 718         spin_lock_irqsave(&d->lock, flags);
 719         ret = d->buffer_status[buffer];
 720         spin_unlock_irqrestore(&d->lock, flags);
 721         return ret;
 722 }
 723
 724 static int __video1394_ioctl(struct file *file,
 725                              unsigned int cmd, unsigned long arg)
 726 {
 727         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
 728         struct ti_ohci *ohci = ctx->ohci;
 729         unsigned long flags;
 730         void __user *argp = (void __user *)arg;
 731
 732         switch(cmd)
 733         {
 734         case VIDEO1394_IOC_LISTEN_CHANNEL:
 735         case VIDEO1394_IOC_TALK_CHANNEL:
 736         {
 737                 struct video1394_mmap v;
 738                 u64 mask;
 739                 struct dma_iso_ctx *d;
 740                 int i;
 741
 742                 if (copy_from_user(&v, argp, sizeof(v)))
 743                         return -EFAULT;
 744
 745                 /* if channel < 0, find lowest available one */
 746                 if (v.channel < 0) {
 747                     mask = (u64)0x1;
 748                     for (i=0; ; i++) {
 749                         if (i == ISO_CHANNELS) {
 750                             PRINT(KERN_ERR, ohci->host->id,
 751                                   "No free channel found");
 752                             return EAGAIN;
 753                         }
 754                         if (!(ohci->ISO_channel_usage & mask)) {
 755                             v.channel = i;
 756                             PRINT(KERN_INFO, ohci->host->id, "Found free channel %d", i);
 757                             break;
 758                         }
 759                         mask = mask << 1;
 760                     }
 761                 } else if (v.channel >= ISO_CHANNELS) {
 762                         PRINT(KERN_ERR, ohci->host->id,
 763                               "Iso channel %d out of bounds", v.channel);
 764                         return -EINVAL;
 765                 } else {
 766                         mask = (u64)0x1<<v.channel;
 767                 }
 768                 PRINT(KERN_INFO, ohci->host->id, "mask: %08X%08X usage: %08X%08X\n",
 769                         (u32)(mask>>32),(u32)(mask&0xffffffff),
 770                         (u32)(ohci->ISO_channel_usage>>32),
 771                         (u32)(ohci->ISO_channel_usage&0xffffffff));
 772                 if (ohci->ISO_channel_usage & mask) {
 773                         PRINT(KERN_ERR, ohci->host->id,
 774                               "Channel %d is already taken", v.channel);
 775                         return -EBUSY;
 776                 }
 777
 778                 if (v.buf_size == 0 || v.buf_size > VIDEO1394_MAX_SIZE) {
 779                         PRINT(KERN_ERR, ohci->host->id,
 780                               "Invalid %d length buffer requested",v.buf_size);
 781                         return -EINVAL;
 782                 }
 783
 784                 if (v.nb_buffers == 0 || v.nb_buffers > VIDEO1394_MAX_SIZE) {
 785                         PRINT(KERN_ERR, ohci->host->id,
 786                               "Invalid %d buffers requested",v.nb_buffers);
 787                         return -EINVAL;
 788                 }
 789
 790                 if (v.nb_buffers * v.buf_size > VIDEO1394_MAX_SIZE) {
 791                         PRINT(KERN_ERR, ohci->host->id,
 792                               "%d buffers of size %d bytes is too big",
 793                               v.nb_buffers, v.buf_size);
 794                         return -EINVAL;
 795                 }
 796
 797                 if (cmd == VIDEO1394_IOC_LISTEN_CHANNEL) {
 798                         d = alloc_dma_iso_ctx(ohci, OHCI_ISO_RECEIVE,
 799                                               v.nb_buffers, v.buf_size,
 800                                               v.channel, 0);
 801
 802                         if (d == NULL) {
 803                                 PRINT(KERN_ERR, ohci->host->id,
 804                                       "Couldn't allocate ir context");
 805                                 return -EAGAIN;
 806                         }
 807                         initialize_dma_ir_ctx(d, v.sync_tag, v.flags);
 808
 809                         ctx->current_ctx = d;
 810
 811                         v.buf_size = d->buf_size;
 812                         list_add_tail(&d->link, &ctx->context_list);
 813
 814                         PRINT(KERN_INFO, ohci->host->id,
 815                               "iso context %d listen on channel %d",
 816                               d->ctx, v.channel);
 817                 }
 818                 else {
 819                         d = alloc_dma_iso_ctx(ohci, OHCI_ISO_TRANSMIT,
 820                                               v.nb_buffers, v.buf_size,
 821                                               v.channel, v.packet_size);
 822
 823                         if (d == NULL) {
 824                                 PRINT(KERN_ERR, ohci->host->id,
 825                                       "Couldn't allocate it context");
 826                                 return -EAGAIN;
 827                         }
 828                         initialize_dma_it_ctx(d, v.sync_tag,
 829                                               v.syt_offset, v.flags);
 830
 831                         ctx->current_ctx = d;
 832
 833                         v.buf_size = d->buf_size;
 834
 835                         list_add_tail(&d->link, &ctx->context_list);
 836
 837                         PRINT(KERN_INFO, ohci->host->id,
 838                               "Iso context %d talk on channel %d", d->ctx,
 839                               v.channel);
 840                 }
 841
 842                 if (copy_to_user((void *)arg, &v, sizeof(v))) {
 843                         /* FIXME : free allocated dma resources */
 844                         return -EFAULT;
 845                 }
 846
 847                 ohci->ISO_channel_usage |= mask;
 848
 849                 return 0;
 850         }
 851         case VIDEO1394_IOC_UNLISTEN_CHANNEL:
 852         case VIDEO1394_IOC_UNTALK_CHANNEL:
 853         {
 854                 int channel;
 855                 u64 mask;
 856                 struct dma_iso_ctx *d;
 857
 858                 if (copy_from_user(&channel, argp, sizeof(int)))
 859                         return -EFAULT;
 860
 861                 if (channel < 0 || channel >= ISO_CHANNELS) {
 862                         PRINT(KERN_ERR, ohci->host->id,
 863                               "Iso channel %d out of bound", channel);
 864                         return -EINVAL;
 865                 }
 866                 mask = (u64)0x1<<channel;
 867                 if (!(ohci->ISO_channel_usage & mask)) {
 868                         PRINT(KERN_ERR, ohci->host->id,
 869                               "Channel %d is not being used", channel);
 870                         return -ESRCH;
 871                 }
 872
 873                 /* Mark this channel as unused */
 874                 ohci->ISO_channel_usage &= ~mask;
 875
 876                 if (cmd == VIDEO1394_IOC_UNLISTEN_CHANNEL)
 877                         d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, channel);
 878                 else
 879                         d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, channel);
 880
 881                 if (d == NULL) return -ESRCH;
 882                 PRINT(KERN_INFO, ohci->host->id, "Iso context %d "
 883                       "stop talking on channel %d", d->ctx, channel);
 884                 free_dma_iso_ctx(d);
 885
 886                 return 0;
 887         }
 888         case VIDEO1394_IOC_LISTEN_QUEUE_BUFFER:
 889         {
 890                 struct video1394_wait v;
 891                 struct dma_iso_ctx *d;
 892
 893                 if (copy_from_user(&v, argp, sizeof(v)))
 894                         return -EFAULT;
 895
 896                 d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
 897                 if (d == NULL) return -EFAULT;
 898
 899                 if ((v.buffer<0) || (v.buffer>d->num_desc)) {
 900                         PRINT(KERN_ERR, ohci->host->id,
 901                               "Buffer %d out of range",v.buffer);
 902                         return -EINVAL;
 903                 }
 904
 905                 spin_lock_irqsave(&d->lock,flags);
 906
 907                 if (d->buffer_status[v.buffer]==VIDEO1394_BUFFER_QUEUED) {
 908                         PRINT(KERN_ERR, ohci->host->id,
 909                               "Buffer %d is already used",v.buffer);
 910                         spin_unlock_irqrestore(&d->lock,flags);
 911                         return -EBUSY;
 912                 }
 913
 914                 d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
 915
 916                 if (d->last_buffer>=0)
 917                         d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress =
 918                                 cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer], 0)
 919                                         & 0xfffffff0) | 0x1);
 920
 921                 d->last_buffer = v.buffer;
 922
 923                 d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress = 0;
 924
 925                 spin_unlock_irqrestore(&d->lock,flags);
 926
 927                 if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
 928                 {
 929                         DBGMSG(ohci->host->id, "Starting iso DMA ctx=%d",d->ctx);
 930
 931                         /* Tell the controller where the first program is */
 932                         reg_write(ohci, d->cmdPtr,
 933                                 dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer], 0) | 0x1);
 934
 935                         /* Run IR context */
 936                         reg_write(ohci, d->ctrlSet, 0x8000);
 937                 }
 938                 else {
 939                         /* Wake up dma context if necessary */
 940                         if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
 941                                 PRINT(KERN_INFO, ohci->host->id,
 942                                       "Waking up iso dma ctx=%d", d->ctx);
 943                                 reg_write(ohci, d->ctrlSet, 0x1000);
 944                         }
 945                 }
 946                 return 0;
 947
 948         }
 949         case VIDEO1394_IOC_LISTEN_WAIT_BUFFER:
 950         case VIDEO1394_IOC_LISTEN_POLL_BUFFER:
 951         {
 952                 struct video1394_wait v;
 953                 struct dma_iso_ctx *d;
 954                 int i;
 955
 956                 if (copy_from_user(&v, argp, sizeof(v)))
 957                         return -EFAULT;
 958
 959                 d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
 960                 if (d == NULL) return -EFAULT;
 961
 962                 if ((v.buffer<0) || (v.buffer>d->num_desc)) {
 963                         PRINT(KERN_ERR, ohci->host->id,
 964                               "Buffer %d out of range",v.buffer);
 965                         return -EINVAL;
 966                 }
 967
 968                 /*
 969                  * I change the way it works so that it returns
 970                  * the last received frame.
 971                  */
 972                 spin_lock_irqsave(&d->lock, flags);
 973                 switch(d->buffer_status[v.buffer]) {
 974                 case VIDEO1394_BUFFER_READY:
 975                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
 976                         break;
 977                 case VIDEO1394_BUFFER_QUEUED:
 978                         if (cmd == VIDEO1394_IOC_LISTEN_POLL_BUFFER) {
 979                             /* for polling, return error code EINTR */
 980                             spin_unlock_irqrestore(&d->lock, flags);
 981                             return -EINTR;
 982                         }
 983
 984                         spin_unlock_irqrestore(&d->lock, flags);
 985                         wait_event_interruptible(d->waitq,
 986                                         video1394_buffer_state(d, v.buffer) ==
 987                                          VIDEO1394_BUFFER_READY);
 988                         if (signal_pending(current))
 989                                 return -EINTR;
 990                         spin_lock_irqsave(&d->lock, flags);
 991                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
 992                         break;
 993                 default:
 994                         PRINT(KERN_ERR, ohci->host->id,
 995                               "Buffer %d is not queued",v.buffer);
 996                         spin_unlock_irqrestore(&d->lock, flags);
 997                         return -ESRCH;
 998                 }
 999
1000                 /* set time of buffer */
1001                 v.filltime = d->buffer_time[v.buffer];
1002 //              printk("Buffer %d time %d\n", v.buffer, (d->buffer_time[v.buffer]).tv_usec);
1003
1004                 /*
1005                  * Look ahead to see how many more buffers have been received
1006                  */
1007                 i=0;
1008                 while (d->buffer_status[(v.buffer+1)%d->num_desc]==
1009                        VIDEO1394_BUFFER_READY) {
1010                         v.buffer=(v.buffer+1)%d->num_desc;
1011                         i++;
1012                 }
1013                 spin_unlock_irqrestore(&d->lock, flags);
1014
1015                 v.buffer=i;
1016                 if (copy_to_user(argp, &v, sizeof(v)))
1017                         return -EFAULT;
1018
1019                 return 0;
1020         }
1021         case VIDEO1394_IOC_TALK_QUEUE_BUFFER:
1022         {
1023                 struct video1394_wait v;
1024                 unsigned int *psizes = NULL;
1025                 struct dma_iso_ctx *d;
1026
1027                 if (copy_from_user(&v, argp, sizeof(v)))
1028                         return -EFAULT;
1029
1030                 d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
1031                 if (d == NULL) return -EFAULT;
1032
1033                 if ((v.buffer<0) || (v.buffer>d->num_desc)) {
1034                         PRINT(KERN_ERR, ohci->host->id,
1035                               "Buffer %d out of range",v.buffer);
1036                         return -EINVAL;
1037                 }
1038
1039                 if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
1040                         int buf_size = d->nb_cmd * sizeof(unsigned int);
1041                         struct video1394_queue_variable __user *p = argp;
1042                         unsigned int __user *qv;
1043
1044                         if (get_user(qv, &p->packet_sizes))
1045                                 return -EFAULT;
1046
1047                         psizes = kmalloc(buf_size, GFP_KERNEL);
1048                         if (!psizes)
1049                                 return -ENOMEM;
1050
1051                         if (copy_from_user(psizes, qv, buf_size)) {
1052                                 kfree(psizes);
1053                                 return -EFAULT;
1054                         }
1055                 }
1056
1057                 spin_lock_irqsave(&d->lock,flags);
1058
1059                 if (d->buffer_status[v.buffer]!=VIDEO1394_BUFFER_FREE) {
1060                         PRINT(KERN_ERR, ohci->host->id,
1061                               "Buffer %d is already used",v.buffer);
1062                         spin_unlock_irqrestore(&d->lock,flags);
1063                         if (psizes)
1064                                 kfree(psizes);
1065                         return -EBUSY;
1066                 }
1067
1068                 if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
1069                         initialize_dma_it_prg_var_packet_queue(
1070                                 d, v.buffer, psizes,
1071                                 ohci);
1072                 }
1073
1074                 d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
1075
1076                 if (d->last_buffer >= 0) {
1077                         d->it_prg[d->last_buffer]
1078                                 [ d->last_used_cmd[d->last_buffer] ].end.branchAddress =
1079                                         cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer],
1080                                                 0) & 0xfffffff0) | 0x3);
1081
1082                         d->it_prg[d->last_buffer]
1083                                 [ d->last_used_cmd[d->last_buffer] ].begin.branchAddress =
1084                                         cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer],
1085                                                 0) & 0xfffffff0) | 0x3);
1086                         d->next_buffer[d->last_buffer] = v.buffer;
1087                 }
1088                 d->last_buffer = v.buffer;
1089                 d->next_buffer[d->last_buffer] = -1;
1090
1091                 d->it_prg[d->last_buffer][d->last_used_cmd[d->last_buffer]].end.branchAddress = 0;
1092
1093                 spin_unlock_irqrestore(&d->lock,flags);
1094
1095                 if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
1096                 {
1097                         DBGMSG(ohci->host->id, "Starting iso transmit DMA ctx=%d",
1098                                d->ctx);
1099                         put_timestamp(ohci, d, d->last_buffer);
1100
1101                         /* Tell the controller where the first program is */
1102                         reg_write(ohci, d->cmdPtr,
1103                                 dma_prog_region_offset_to_bus(&d->prg_reg[v.buffer], 0) | 0x3);
1104
1105                         /* Run IT context */
1106                         reg_write(ohci, d->ctrlSet, 0x8000);
1107                 }
1108                 else {
1109                         /* Wake up dma context if necessary */
1110                         if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
1111                                 PRINT(KERN_INFO, ohci->host->id,
1112                                       "Waking up iso transmit dma ctx=%d",
1113                                       d->ctx);
1114                                 put_timestamp(ohci, d, d->last_buffer);
1115                                 reg_write(ohci, d->ctrlSet, 0x1000);
1116                         }
1117                 }
1118
1119                 if (psizes)
1120                         kfree(psizes);
1121
1122                 return 0;
1123
1124         }
1125         case VIDEO1394_IOC_TALK_WAIT_BUFFER:
1126         {
1127                 struct video1394_wait v;
1128                 struct dma_iso_ctx *d;
1129
1130                 if (copy_from_user(&v, argp, sizeof(v)))
1131                         return -EFAULT;
1132
1133                 d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
1134                 if (d == NULL) return -EFAULT;
1135
1136                 if ((v.buffer<0) || (v.buffer>d->num_desc)) {
1137                         PRINT(KERN_ERR, ohci->host->id,
1138                               "Buffer %d out of range",v.buffer);
1139                         return -EINVAL;
1140                 }
1141
1142                 switch(d->buffer_status[v.buffer]) {
1143                 case VIDEO1394_BUFFER_READY:
1144                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
1145                         return 0;
1146                 case VIDEO1394_BUFFER_QUEUED:
1147                         wait_event_interruptible(d->waitq,
1148                                         (d->buffer_status[v.buffer] == VIDEO1394_BUFFER_READY));
1149                         if (signal_pending(current))
1150                                 return -EINTR;
1151                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
1152                         return 0;
1153                 default:
1154                         PRINT(KERN_ERR, ohci->host->id,
1155                               "Buffer %d is not queued",v.buffer);
1156                         return -ESRCH;
1157                 }
1158         }
1159         default:
1160                 return -ENOTTY;
1161         }
1162 }
1163
1164 static long video1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1165 {
1166         int err;
1167         lock_kernel();
1168         err = __video1394_ioctl(file, cmd, arg);
1169         unlock_kernel();
1170         return err;
1171 }
1172
1173 /*
1174  *      This maps the vmalloced and reserved buffer to user space.
1175  *
1176  *  FIXME:
1177  *  - PAGE_READONLY should suffice!?
1178  *  - remap_pfn_range is kind of inefficient for page by page remapping.
1179  *    But e.g. pte_alloc() does not work in modules ... :-(
1180  */
1181
1182 static int video1394_mmap(struct file *file, struct vm_area_struct *vma)
1183 {
1184         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
1185         int res = -EINVAL;
1186
1187         lock_kernel();
1188         if (ctx->current_ctx == NULL) {
1189                 PRINT(KERN_ERR, ctx->ohci->host->id, "Current iso context not set");
1190         } else
1191                 res = dma_region_mmap(&ctx->current_ctx->dma, file, vma);
1192         unlock_kernel();
1193
1194         return res;
1195 }
1196
1197 static int video1394_open(struct inode *inode, struct file *file)
1198 {
1199         int i = ieee1394_file_to_instance(file);
1200         struct ti_ohci *ohci;
1201         struct file_ctx *ctx;
1202
1203         ohci = hpsb_get_hostinfo_bykey(&video1394_highlevel, i);
1204         if (ohci == NULL)
1205                 return -EIO;
1206
1207         ctx = kmalloc(sizeof(struct file_ctx), GFP_KERNEL);
1208         if (ctx == NULL)  {
1209                 PRINT(KERN_ERR, ohci->host->id, "Cannot malloc file_ctx");
1210                 return -ENOMEM;
1211         }
1212
1213         memset(ctx, 0, sizeof(struct file_ctx));
1214         ctx->ohci = ohci;
1215         INIT_LIST_HEAD(&ctx->context_list);
1216         ctx->current_ctx = NULL;
1217         file->private_data = ctx;
1218
1219         return 0;
1220 }
1221
1222 static int video1394_release(struct inode *inode, struct file *file)
1223 {
1224         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
1225         struct ti_ohci *ohci = ctx->ohci;
1226         struct list_head *lh, *next;
1227         u64 mask;
1228
1229         lock_kernel();
1230         list_for_each_safe(lh, next, &ctx->context_list) {
1231                 struct dma_iso_ctx *d;
1232                 d = list_entry(lh, struct dma_iso_ctx, link);
1233                 mask = (u64) 1 << d->channel;
1234
1235                 if (!(ohci->ISO_channel_usage & mask))
1236                         PRINT(KERN_ERR, ohci->host->id, "On release: Channel %d "
1237                               "is not being used", d->channel);
1238                 else
1239                         ohci->ISO_channel_usage &= ~mask;
1240                 PRINT(KERN_INFO, ohci->host->id, "On release: Iso %s context "
1241                       "%d stop listening on channel %d",
1242                       d->type == OHCI_ISO_RECEIVE ? "receive" : "transmit",
1243                       d->ctx, d->channel);
1244                 free_dma_iso_ctx(d);
1245         }
1246
1247         kfree(ctx);
1248         file->private_data = NULL;
1249
1250         unlock_kernel();
1251         return 0;
1252 }
1253
1254 #ifdef CONFIG_COMPAT
1255 static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg);
1256 #endif
1257
1258 static struct cdev video1394_cdev;
1259 static struct file_operations video1394_fops=
1260 {
1261         .owner =        THIS_MODULE,
1262         .unlocked_ioctl = video1394_ioctl,
1263 #ifdef CONFIG_COMPAT
1264         .compat_ioctl = video1394_compat_ioctl,
1265 #endif
1266         .mmap =         video1394_mmap,
1267         .open =         video1394_open,
1268         .release =      video1394_release
1269 };
1270
1271 /*** HOTPLUG STUFF **********************************************************/
1272 /*
1273  * Export information about protocols/devices supported by this driver.
1274  */
1275 static struct ieee1394_device_id video1394_id_table[] = {
1276         {
1277                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1278                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1279                 .version        = CAMERA_SW_VERSION_ENTRY & 0xffffff
1280         },
1281         {
1282                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1283                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1284                 .version        = (CAMERA_SW_VERSION_ENTRY + 1) & 0xffffff
1285         },
1286         {
1287                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1288                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1289                 .version        = (CAMERA_SW_VERSION_ENTRY + 2) & 0xffffff
1290         },
1291         { }
1292 };
1293
1294 MODULE_DEVICE_TABLE(ieee1394, video1394_id_table);
1295
1296 static struct hpsb_protocol_driver video1394_driver = {
1297         .name           = "1394 Digital Camera Driver",
1298         .id_table       = video1394_id_table,
1299         .driver         = {
1300                 .name   = VIDEO1394_DRIVER_NAME,
1301                 .bus    = &ieee1394_bus_type,
1302         },
1303 };
1304
1305
1306 static void video1394_add_host (struct hpsb_host *host)
1307 {
1308         struct ti_ohci *ohci;
1309         int minor;
1310
1311         /* We only work with the OHCI-1394 driver */
1312         if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
1313                 return;
1314
1315         ohci = (struct ti_ohci *)host->hostdata;
1316
1317         if (!hpsb_create_hostinfo(&video1394_highlevel, host, 0)) {
1318                 PRINT(KERN_ERR, ohci->host->id, "Cannot allocate hostinfo");
1319                 return;
1320         }
1321
1322         hpsb_set_hostinfo(&video1394_highlevel, host, ohci);
1323         hpsb_set_hostinfo_key(&video1394_highlevel, host, ohci->host->id);
1324
1325         minor = IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id;
1326         class_simple_device_add(hpsb_protocol_class, MKDEV(
1327                 IEEE1394_MAJOR, minor),
1328                 NULL, "%s-%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
1329         devfs_mk_cdev(MKDEV(IEEE1394_MAJOR, minor),
1330                        S_IFCHR | S_IRUSR | S_IWUSR,
1331                        "%s/%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
1332 }
1333
1334
1335 static void video1394_remove_host (struct hpsb_host *host)
1336 {
1337         struct ti_ohci *ohci = hpsb_get_hostinfo(&video1394_highlevel, host);
1338
1339         if (ohci) {
1340                 class_simple_device_remove(MKDEV(IEEE1394_MAJOR,
1341                         IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id));
1342                 devfs_remove("%s/%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
1343         }
1344
1345         return;
1346 }
1347
1348
1349 static struct hpsb_highlevel video1394_highlevel = {
1350         .name =         VIDEO1394_DRIVER_NAME,
1351         .add_host =     video1394_add_host,
1352         .remove_host =  video1394_remove_host,
1353 };
1354
1355 MODULE_AUTHOR("Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>");
1356 MODULE_DESCRIPTION("driver for digital video on OHCI board");
1357 MODULE_SUPPORTED_DEVICE(VIDEO1394_DRIVER_NAME);
1358 MODULE_LICENSE("GPL");
1359
1360 #ifdef CONFIG_COMPAT
1361
1362 #define VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER     \
1363         _IOW ('#', 0x12, struct video1394_wait32)
1364 #define VIDEO1394_IOC32_LISTEN_WAIT_BUFFER      \
1365         _IOWR('#', 0x13, struct video1394_wait32)
1366 #define VIDEO1394_IOC32_TALK_WAIT_BUFFER        \
1367         _IOW ('#', 0x17, struct video1394_wait32)
1368 #define VIDEO1394_IOC32_LISTEN_POLL_BUFFER      \
1369         _IOWR('#', 0x18, struct video1394_wait32)
1370
1371 struct video1394_wait32 {
1372         u32 channel;
1373         u32 buffer;
1374         struct compat_timeval filltime;
1375 };
1376
1377 static int video1394_wr_wait32(struct file *file, unsigned int cmd, unsigned long arg)
1378 {
1379         struct video1394_wait32 __user *argp = (void __user *)arg;
1380         struct video1394_wait32 wait32;
1381         struct video1394_wait wait;
1382         mm_segment_t old_fs;
1383         int ret;
1384
1385         if (copy_from_user(&wait32, argp, sizeof(wait32)))
1386                 return -EFAULT;
1387
1388         wait.channel = wait32.channel;
1389         wait.buffer = wait32.buffer;
1390         wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
1391         wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
1392
1393         old_fs = get_fs();
1394         set_fs(KERNEL_DS);
1395         if (cmd == VIDEO1394_IOC32_LISTEN_WAIT_BUFFER)
1396                 ret = video1394_ioctl(file,
1397                                       VIDEO1394_IOC_LISTEN_WAIT_BUFFER,
1398                                       (unsigned long) &wait);
1399         else
1400                 ret = video1394_ioctl(file,
1401                                       VIDEO1394_IOC_LISTEN_POLL_BUFFER,
1402                                       (unsigned long) &wait);
1403         set_fs(old_fs);
1404
1405         if (!ret) {
1406                 wait32.channel = wait.channel;
1407                 wait32.buffer = wait.buffer;
1408                 wait32.filltime.tv_sec = (int)wait.filltime.tv_sec;
1409                 wait32.filltime.tv_usec = (int)wait.filltime.tv_usec;
1410
1411                 if (copy_to_user(argp, &wait32, sizeof(wait32)))
1412                         ret = -EFAULT;
1413         }
1414
1415         return ret;
1416 }
1417
1418 static int video1394_w_wait32(struct file *file, unsigned int cmd, unsigned long arg)
1419 {
1420         struct video1394_wait32 wait32;
1421         struct video1394_wait wait;
1422         mm_segment_t old_fs;
1423         int ret;
1424
1425         if (copy_from_user(&wait32, (void __user *)arg, sizeof(wait32)))
1426                 return -EFAULT;
1427
1428         wait.channel = wait32.channel;
1429         wait.buffer = wait32.buffer;
1430         wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
1431         wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
1432
1433         old_fs = get_fs();
1434         set_fs(KERNEL_DS);
1435         if (cmd == VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER)
1436                 ret = video1394_ioctl(file,
1437                                       VIDEO1394_IOC_LISTEN_QUEUE_BUFFER,
1438                                       (unsigned long) &wait);
1439         else
1440                 ret = video1394_ioctl(file,
1441                                       VIDEO1394_IOC_TALK_WAIT_BUFFER,
1442                                       (unsigned long) &wait);
1443         set_fs(old_fs);
1444
1445         return ret;
1446 }
1447
1448 static int video1394_queue_buf32(struct file *file, unsigned int cmd, unsigned long arg)
1449 {
1450         return -EFAULT;   /* ??? was there before. */
1451
1452         return video1394_ioctl(file,
1453                                 VIDEO1394_IOC_TALK_QUEUE_BUFFER, arg);
1454 }
1455
1456 static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg)
1457 {
1458         switch (cmd) {
1459         case VIDEO1394_IOC_LISTEN_CHANNEL:
1460         case VIDEO1394_IOC_UNLISTEN_CHANNEL:
1461         case VIDEO1394_IOC_TALK_CHANNEL:
1462         case VIDEO1394_IOC_UNTALK_CHANNEL:
1463                 return video1394_ioctl(f, cmd, arg);
1464
1465         case VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER:
1466                 return video1394_w_wait32(f, cmd, arg);
1467         case VIDEO1394_IOC32_LISTEN_WAIT_BUFFER:
1468                 return video1394_wr_wait32(f, cmd, arg);
1469         case VIDEO1394_IOC_TALK_QUEUE_BUFFER:
1470                 return video1394_queue_buf32(f, cmd, arg);
1471         case VIDEO1394_IOC32_TALK_WAIT_BUFFER:
1472                 return video1394_w_wait32(f, cmd, arg);
1473         case VIDEO1394_IOC32_LISTEN_POLL_BUFFER:
1474                 return video1394_wr_wait32(f, cmd, arg);
1475         default:
1476                 return -ENOIOCTLCMD;
1477         }
1478 }
1479
1480 #endif /* CONFIG_COMPAT */
1481
1482 static void __exit video1394_exit_module (void)
1483 {
1484         hpsb_unregister_protocol(&video1394_driver);
1485
1486         hpsb_unregister_highlevel(&video1394_highlevel);
1487
1488         devfs_remove(VIDEO1394_DRIVER_NAME);
1489         cdev_del(&video1394_cdev);
1490
1491         PRINT_G(KERN_INFO, "Removed " VIDEO1394_DRIVER_NAME " module");
1492 }
1493
1494 static int __init video1394_init_module (void)
1495 {
1496         int ret;
1497
1498         cdev_init(&video1394_cdev, &video1394_fops);
1499         video1394_cdev.owner = THIS_MODULE;
1500         kobject_set_name(&video1394_cdev.kobj, VIDEO1394_DRIVER_NAME);
1501         ret = cdev_add(&video1394_cdev, IEEE1394_VIDEO1394_DEV, 16);
1502         if (ret) {
1503                 PRINT_G(KERN_ERR, "video1394: unable to get minor device block");
1504                 return ret;
1505         }
1506
1507         devfs_mk_dir(VIDEO1394_DRIVER_NAME);
1508
1509         hpsb_register_highlevel(&video1394_highlevel);
1510
1511         ret = hpsb_register_protocol(&video1394_driver);
1512         if (ret) {
1513                 PRINT_G(KERN_ERR, "video1394: failed to register protocol");
1514                 hpsb_unregister_highlevel(&video1394_highlevel);
1515                 devfs_remove(VIDEO1394_DRIVER_NAME);
1516                 cdev_del(&video1394_cdev);
1517                 return ret;
1518         }
1519
1520         PRINT_G(KERN_INFO, "Installed " VIDEO1394_DRIVER_NAME " module");
1521         return 0;
1522 }
1523
1524
1525 module_init(video1394_init_module);
1526 module_exit(video1394_exit_module);
1527 MODULE_ALIAS_CHARDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_VIDEO1394 * 16);