git.oblomov.eu Git - linux-2.6/blob - 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  * ioctl return codes:
  23  * EFAULT is only for invalid address for the argp
  24  * EINVAL for out of range values
  25  * EBUSY when trying to use an already used resource
  26  * ESRCH when trying to free/stop a not used resource
  27  * EAGAIN for resource allocation failure that could perhaps succeed later
  28  * ENOTTY for unsupported ioctl request
  29  *
  30  */
  31 #include <linux/kernel.h>
  32 #include <linux/list.h>
  33 #include <linux/slab.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/wait.h>
  36 #include <linux/errno.h>
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/pci.h>
  40 #include <linux/fs.h>
  41 #include <linux/poll.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/delay.h>
  44 #include <linux/bitops.h>
  45 #include <linux/types.h>
  46 #include <linux/vmalloc.h>
  47 #include <linux/timex.h>
  48 #include <linux/mm.h>
  49 #include <linux/compat.h>
  50 #include <linux/cdev.h>
  51
  52 #include "dma.h"
  53 #include "highlevel.h"
  54 #include "hosts.h"
  55 #include "ieee1394.h"
  56 #include "ieee1394_core.h"
  57 #include "ieee1394_hotplug.h"
  58 #include "ieee1394_types.h"
  59 #include "nodemgr.h"
  60 #include "ohci1394.h"
  61 #include "video1394.h"
  62
  63 #define ISO_CHANNELS 64
  64
  65 struct it_dma_prg {
  66         struct dma_cmd begin;
  67         quadlet_t data[4];
  68         struct dma_cmd end;
  69         quadlet_t pad[4]; /* FIXME: quick hack for memory alignment */
  70 };
  71
  72 struct dma_iso_ctx {
  73         struct ti_ohci *ohci;
  74         int type; /* OHCI_ISO_TRANSMIT or OHCI_ISO_RECEIVE */
  75         struct ohci1394_iso_tasklet iso_tasklet;
  76         int channel;
  77         int ctx;
  78         int last_buffer;
  79         int * next_buffer;  /* For ISO Transmit of video packets
  80                                to write the correct SYT field
  81                                into the next block */
  82         unsigned int num_desc;
  83         unsigned int buf_size;
  84         unsigned int frame_size;
  85         unsigned int packet_size;
  86         unsigned int left_size;
  87         unsigned int nb_cmd;
  88
  89         struct dma_region dma;
  90
  91         struct dma_prog_region *prg_reg;
  92
  93         struct dma_cmd **ir_prg;
  94         struct it_dma_prg **it_prg;
  95
  96         unsigned int *buffer_status;
  97         unsigned int *buffer_prg_assignment;
  98         struct timeval *buffer_time; /* time when the buffer was received */
  99         unsigned int *last_used_cmd; /* For ISO Transmit with
 100                                         variable sized packets only ! */
 101         int ctrlClear;
 102         int ctrlSet;
 103         int cmdPtr;
 104         int ctxMatch;
 105         wait_queue_head_t waitq;
 106         spinlock_t lock;
 107         unsigned int syt_offset;
 108         int flags;
 109
 110         struct list_head link;
 111 };
 112
 113
 114 struct file_ctx {
 115         struct ti_ohci *ohci;
 116         struct list_head context_list;
 117         struct dma_iso_ctx *current_ctx;
 118 };
 119
 120 #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
 121 #define VIDEO1394_DEBUG
 122 #endif
 123
 124 #ifdef DBGMSG
 125 #undef DBGMSG
 126 #endif
 127
 128 #ifdef VIDEO1394_DEBUG
 129 #define DBGMSG(card, fmt, args...) \
 130 printk(KERN_INFO "video1394_%d: " fmt "\n" , card , ## args)
 131 #else
 132 #define DBGMSG(card, fmt, args...) do {} while (0)
 133 #endif
 134
 135 /* print general (card independent) information */
 136 #define PRINT_G(level, fmt, args...) \
 137 printk(level "video1394: " fmt "\n" , ## args)
 138
 139 /* print card specific information */
 140 #define PRINT(level, card, fmt, args...) \
 141 printk(level "video1394_%d: " fmt "\n" , card , ## args)
 142
 143 static void wakeup_dma_ir_ctx(unsigned long l);
 144 static void wakeup_dma_it_ctx(unsigned long l);
 145
 146 static struct hpsb_highlevel video1394_highlevel;
 147
 148 static int free_dma_iso_ctx(struct dma_iso_ctx *d)
 149 {
 150         int i;
 151
 152         DBGMSG(d->ohci->host->id, "Freeing dma_iso_ctx %d", d->ctx);
 153
 154         ohci1394_stop_context(d->ohci, d->ctrlClear, NULL);
 155         if (d->iso_tasklet.link.next != NULL)
 156                 ohci1394_unregister_iso_tasklet(d->ohci, &d->iso_tasklet);
 157
 158         dma_region_free(&d->dma);
 159
 160         if (d->prg_reg) {
 161                 for (i = 0; i < d->num_desc; i++)
 162                         dma_prog_region_free(&d->prg_reg[i]);
 163                 kfree(d->prg_reg);
 164         }
 165
 166         kfree(d->ir_prg);
 167         kfree(d->it_prg);
 168         kfree(d->buffer_status);
 169         kfree(d->buffer_prg_assignment);
 170         kfree(d->buffer_time);
 171         kfree(d->last_used_cmd);
 172         kfree(d->next_buffer);
 173         list_del(&d->link);
 174         kfree(d);
 175
 176         return 0;
 177 }
 178
 179 static struct dma_iso_ctx *
 180 alloc_dma_iso_ctx(struct ti_ohci *ohci, int type, int num_desc,
 181                   int buf_size, int channel, unsigned int packet_size)
 182 {
 183         struct dma_iso_ctx *d;
 184         int i;
 185
 186         d = kzalloc(sizeof(*d), GFP_KERNEL);
 187         if (!d) {
 188                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma_iso_ctx");
 189                 return NULL;
 190         }
 191
 192         d->ohci = ohci;
 193         d->type = type;
 194         d->channel = channel;
 195         d->num_desc = num_desc;
 196         d->frame_size = buf_size;
 197         d->buf_size = PAGE_ALIGN(buf_size);
 198         d->last_buffer = -1;
 199         INIT_LIST_HEAD(&d->link);
 200         init_waitqueue_head(&d->waitq);
 201
 202         /* Init the regions for easy cleanup */
 203         dma_region_init(&d->dma);
 204
 205         if (dma_region_alloc(&d->dma, (d->num_desc - 1) * d->buf_size, ohci->dev,
 206                              PCI_DMA_BIDIRECTIONAL)) {
 207                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma buffer");
 208                 free_dma_iso_ctx(d);
 209                 return NULL;
 210         }
 211
 212         if (type == OHCI_ISO_RECEIVE)
 213                 ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
 214                                           wakeup_dma_ir_ctx,
 215                                           (unsigned long) d);
 216         else
 217                 ohci1394_init_iso_tasklet(&d->iso_tasklet, type,
 218                                           wakeup_dma_it_ctx,
 219                                           (unsigned long) d);
 220
 221         if (ohci1394_register_iso_tasklet(ohci, &d->iso_tasklet) < 0) {
 222                 PRINT(KERN_ERR, ohci->host->id, "no free iso %s contexts",
 223                       type == OHCI_ISO_RECEIVE ? "receive" : "transmit");
 224                 free_dma_iso_ctx(d);
 225                 return NULL;
 226         }
 227         d->ctx = d->iso_tasklet.context;
 228
 229         d->prg_reg = kmalloc(d->num_desc * sizeof(*d->prg_reg), GFP_KERNEL);
 230         if (!d->prg_reg) {
 231                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate ir prg regs");
 232                 free_dma_iso_ctx(d);
 233                 return NULL;
 234         }
 235         /* Makes for easier cleanup */
 236         for (i = 0; i < d->num_desc; i++)
 237                 dma_prog_region_init(&d->prg_reg[i]);
 238
 239         if (type == OHCI_ISO_RECEIVE) {
 240                 d->ctrlSet = OHCI1394_IsoRcvContextControlSet+32*d->ctx;
 241                 d->ctrlClear = OHCI1394_IsoRcvContextControlClear+32*d->ctx;
 242                 d->cmdPtr = OHCI1394_IsoRcvCommandPtr+32*d->ctx;
 243                 d->ctxMatch = OHCI1394_IsoRcvContextMatch+32*d->ctx;
 244
 245                 d->ir_prg = kzalloc(d->num_desc * sizeof(*d->ir_prg),
 246                                     GFP_KERNEL);
 247
 248                 if (!d->ir_prg) {
 249                         PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
 250                         free_dma_iso_ctx(d);
 251                         return NULL;
 252                 }
 253
 254                 d->nb_cmd = d->buf_size / PAGE_SIZE + 1;
 255                 d->left_size = (d->frame_size % PAGE_SIZE) ?
 256                         d->frame_size % PAGE_SIZE : PAGE_SIZE;
 257
 258                 for (i = 0;i < d->num_desc; i++) {
 259                         if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
 260                                                   sizeof(struct dma_cmd), ohci->dev)) {
 261                                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma ir prg");
 262                                 free_dma_iso_ctx(d);
 263                                 return NULL;
 264                         }
 265                         d->ir_prg[i] = (struct dma_cmd *)d->prg_reg[i].kvirt;
 266                 }
 267
 268         } else {  /* OHCI_ISO_TRANSMIT */
 269                 d->ctrlSet = OHCI1394_IsoXmitContextControlSet+16*d->ctx;
 270                 d->ctrlClear = OHCI1394_IsoXmitContextControlClear+16*d->ctx;
 271                 d->cmdPtr = OHCI1394_IsoXmitCommandPtr+16*d->ctx;
 272
 273                 d->it_prg = kzalloc(d->num_desc * sizeof(*d->it_prg),
 274                                     GFP_KERNEL);
 275
 276                 if (!d->it_prg) {
 277                         PRINT(KERN_ERR, ohci->host->id,
 278                               "Failed to allocate dma it prg");
 279                         free_dma_iso_ctx(d);
 280                         return NULL;
 281                 }
 282
 283                 d->packet_size = packet_size;
 284
 285                 if (PAGE_SIZE % packet_size || packet_size>4096) {
 286                         PRINT(KERN_ERR, ohci->host->id,
 287                               "Packet size %d (page_size: %ld) "
 288                               "not yet supported\n",
 289                               packet_size, PAGE_SIZE);
 290                         free_dma_iso_ctx(d);
 291                         return NULL;
 292                 }
 293
 294                 d->nb_cmd = d->frame_size / d->packet_size;
 295                 if (d->frame_size % d->packet_size) {
 296                         d->nb_cmd++;
 297                         d->left_size = d->frame_size % d->packet_size;
 298                 } else
 299                         d->left_size = d->packet_size;
 300
 301                 for (i = 0; i < d->num_desc; i++) {
 302                         if (dma_prog_region_alloc(&d->prg_reg[i], d->nb_cmd *
 303                                                 sizeof(struct it_dma_prg), ohci->dev)) {
 304                                 PRINT(KERN_ERR, ohci->host->id, "Failed to allocate dma it prg");
 305                                 free_dma_iso_ctx(d);
 306                                 return NULL;
 307                         }
 308                         d->it_prg[i] = (struct it_dma_prg *)d->prg_reg[i].kvirt;
 309                 }
 310         }
 311
 312         d->buffer_status =
 313             kzalloc(d->num_desc * sizeof(*d->buffer_status), GFP_KERNEL);
 314         d->buffer_prg_assignment =
 315             kzalloc(d->num_desc * sizeof(*d->buffer_prg_assignment), GFP_KERNEL);
 316         d->buffer_time =
 317             kzalloc(d->num_desc * sizeof(*d->buffer_time), GFP_KERNEL);
 318         d->last_used_cmd =
 319             kzalloc(d->num_desc * sizeof(*d->last_used_cmd), GFP_KERNEL);
 320         d->next_buffer =
 321             kzalloc(d->num_desc * sizeof(*d->next_buffer), GFP_KERNEL);
 322
 323         if (!d->buffer_status || !d->buffer_prg_assignment || !d->buffer_time ||
 324             !d->last_used_cmd || !d->next_buffer) {
 325                 PRINT(KERN_ERR, ohci->host->id,
 326                       "Failed to allocate dma_iso_ctx member");
 327                 free_dma_iso_ctx(d);
 328                 return NULL;
 329         }
 330
 331         spin_lock_init(&d->lock);
 332
 333         DBGMSG(ohci->host->id, "Iso %s DMA: %d buffers "
 334               "of size %d allocated for a frame size %d, each with %d prgs",
 335               (type == OHCI_ISO_RECEIVE) ? "receive" : "transmit",
 336               d->num_desc - 1, d->buf_size, d->frame_size, d->nb_cmd);
 337
 338         return d;
 339 }
 340
 341 static void reset_ir_status(struct dma_iso_ctx *d, int n)
 342 {
 343         int i;
 344         d->ir_prg[n][0].status = cpu_to_le32(4);
 345         d->ir_prg[n][1].status = cpu_to_le32(PAGE_SIZE-4);
 346         for (i = 2; i < d->nb_cmd - 1; i++)
 347                 d->ir_prg[n][i].status = cpu_to_le32(PAGE_SIZE);
 348         d->ir_prg[n][i].status = cpu_to_le32(d->left_size);
 349 }
 350
 351 static void reprogram_dma_ir_prg(struct dma_iso_ctx *d, int n, int buffer, int flags)
 352 {
 353         struct dma_cmd *ir_prg = d->ir_prg[n];
 354         unsigned long buf = (unsigned long)d->dma.kvirt + buffer * d->buf_size;
 355         int i;
 356
 357         d->buffer_prg_assignment[n] = buffer;
 358
 359         ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
 360                                 (unsigned long)d->dma.kvirt));
 361         ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 362                                 (buf + 4) - (unsigned long)d->dma.kvirt));
 363
 364         for (i=2;i<d->nb_cmd-1;i++) {
 365                 ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 366                                                 (buf+(i-1)*PAGE_SIZE) -
 367                                                 (unsigned long)d->dma.kvirt));
 368         }
 369
 370         ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 371                                   DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
 372         ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 373                                   (buf+(i-1)*PAGE_SIZE) - (unsigned long)d->dma.kvirt));
 374 }
 375
 376 static void initialize_dma_ir_prg(struct dma_iso_ctx *d, int n, int flags)
 377 {
 378         struct dma_cmd *ir_prg = d->ir_prg[n];
 379         struct dma_prog_region *ir_reg = &d->prg_reg[n];
 380         unsigned long buf = (unsigned long)d->dma.kvirt;
 381         int i;
 382
 383         /* the first descriptor will read only 4 bytes */
 384         ir_prg[0].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 385                 DMA_CTL_BRANCH | 4);
 386
 387         /* set the sync flag */
 388         if (flags & VIDEO1394_SYNC_FRAMES)
 389                 ir_prg[0].control |= cpu_to_le32(DMA_CTL_WAIT);
 390
 391         ir_prg[0].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, buf -
 392                                 (unsigned long)d->dma.kvirt));
 393         ir_prg[0].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
 394                                         1 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
 395
 396         /* If there is *not* only one DMA page per frame (hence, d->nb_cmd==2) */
 397         if (d->nb_cmd > 2) {
 398                 /* The second descriptor will read PAGE_SIZE-4 bytes */
 399                 ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 400                                                 DMA_CTL_BRANCH | (PAGE_SIZE-4));
 401                 ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf + 4) -
 402                                                 (unsigned long)d->dma.kvirt));
 403                 ir_prg[1].branchAddress = cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
 404                                                       2 * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
 405
 406                 for (i = 2; i < d->nb_cmd - 1; i++) {
 407                         ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 408                                                         DMA_CTL_BRANCH | PAGE_SIZE);
 409                         ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 410                                                         (buf+(i-1)*PAGE_SIZE) -
 411                                                         (unsigned long)d->dma.kvirt));
 412
 413                         ir_prg[i].branchAddress =
 414                                 cpu_to_le32((dma_prog_region_offset_to_bus(ir_reg,
 415                                             (i + 1) * sizeof(struct dma_cmd)) & 0xfffffff0) | 0x1);
 416                 }
 417
 418                 /* The last descriptor will generate an interrupt */
 419                 ir_prg[i].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 420                                                 DMA_CTL_IRQ | DMA_CTL_BRANCH | d->left_size);
 421                 ir_prg[i].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 422                                                 (buf+(i-1)*PAGE_SIZE) -
 423                                                 (unsigned long)d->dma.kvirt));
 424         } else {
 425                 /* Only one DMA page is used. Read d->left_size immediately and */
 426                 /* generate an interrupt as this is also the last page. */
 427                 ir_prg[1].control = cpu_to_le32(DMA_CTL_INPUT_MORE | DMA_CTL_UPDATE |
 428                                                 DMA_CTL_IRQ | DMA_CTL_BRANCH | (d->left_size-4));
 429                 ir_prg[1].address = cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 430                                                 (buf + 4) - (unsigned long)d->dma.kvirt));
 431         }
 432 }
 433
 434 static void initialize_dma_ir_ctx(struct dma_iso_ctx *d, int tag, int flags)
 435 {
 436         struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
 437         int i;
 438
 439         d->flags = flags;
 440
 441         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
 442
 443         for (i=0;i<d->num_desc;i++) {
 444                 initialize_dma_ir_prg(d, i, flags);
 445                 reset_ir_status(d, i);
 446         }
 447
 448         /* reset the ctrl register */
 449         reg_write(ohci, d->ctrlClear, 0xf0000000);
 450
 451         /* Set bufferFill */
 452         reg_write(ohci, d->ctrlSet, 0x80000000);
 453
 454         /* Set isoch header */
 455         if (flags & VIDEO1394_INCLUDE_ISO_HEADERS)
 456                 reg_write(ohci, d->ctrlSet, 0x40000000);
 457
 458         /* Set the context match register to match on all tags,
 459            sync for sync tag, and listen to d->channel */
 460         reg_write(ohci, d->ctxMatch, 0xf0000000|((tag&0xf)<<8)|d->channel);
 461
 462         /* Set up isoRecvIntMask to generate interrupts */
 463         reg_write(ohci, OHCI1394_IsoRecvIntMaskSet, 1<<d->ctx);
 464 }
 465
 466 /* find which context is listening to this channel */
 467 static struct dma_iso_ctx *
 468 find_ctx(struct list_head *list, int type, int channel)
 469 {
 470         struct dma_iso_ctx *ctx;
 471
 472         list_for_each_entry(ctx, list, link) {
 473                 if (ctx->type == type && ctx->channel == channel)
 474                         return ctx;
 475         }
 476
 477         return NULL;
 478 }
 479
 480 static void wakeup_dma_ir_ctx(unsigned long l)
 481 {
 482         struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
 483         int i;
 484
 485         spin_lock(&d->lock);
 486
 487         for (i = 0; i < d->num_desc; i++) {
 488                 if (d->ir_prg[i][d->nb_cmd-1].status & cpu_to_le32(0xFFFF0000)) {
 489                         reset_ir_status(d, i);
 490                         d->buffer_status[d->buffer_prg_assignment[i]] = VIDEO1394_BUFFER_READY;
 491                         do_gettimeofday(&d->buffer_time[d->buffer_prg_assignment[i]]);
 492                         dma_region_sync_for_cpu(&d->dma,
 493                                 d->buffer_prg_assignment[i] * d->buf_size,
 494                                 d->buf_size);
 495                 }
 496         }
 497
 498         spin_unlock(&d->lock);
 499
 500         if (waitqueue_active(&d->waitq))
 501                 wake_up_interruptible(&d->waitq);
 502 }
 503
 504 static inline void put_timestamp(struct ti_ohci *ohci, struct dma_iso_ctx * d,
 505                                  int n)
 506 {
 507         unsigned char* buf = d->dma.kvirt + n * d->buf_size;
 508         u32 cycleTimer;
 509         u32 timeStamp;
 510
 511         if (n == -1) {
 512           return;
 513         }
 514
 515         cycleTimer = reg_read(ohci, OHCI1394_IsochronousCycleTimer);
 516
 517         timeStamp = ((cycleTimer & 0x0fff) + d->syt_offset); /* 11059 = 450 us */
 518         timeStamp = (timeStamp % 3072 + ((timeStamp / 3072) << 12)
 519                 + (cycleTimer & 0xf000)) & 0xffff;
 520
 521         buf[6] = timeStamp >> 8;
 522         buf[7] = timeStamp & 0xff;
 523
 524     /* if first packet is empty packet, then put timestamp into the next full one too */
 525     if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
 526             buf += d->packet_size;
 527         buf[6] = timeStamp >> 8;
 528             buf[7] = timeStamp & 0xff;
 529         }
 530
 531     /* do the next buffer frame too in case of irq latency */
 532         n = d->next_buffer[n];
 533         if (n == -1) {
 534           return;
 535         }
 536         buf = d->dma.kvirt + n * d->buf_size;
 537
 538         timeStamp += (d->last_used_cmd[n] << 12) & 0xffff;
 539
 540         buf[6] = timeStamp >> 8;
 541         buf[7] = timeStamp & 0xff;
 542
 543     /* if first packet is empty packet, then put timestamp into the next full one too */
 544     if ( (le32_to_cpu(d->it_prg[n][0].data[1]) >>16) == 0x008) {
 545             buf += d->packet_size;
 546         buf[6] = timeStamp >> 8;
 547             buf[7] = timeStamp & 0xff;
 548         }
 549
 550 #if 0
 551         printk("curr: %d, next: %d, cycleTimer: %08x timeStamp: %08x\n",
 552                curr, n, cycleTimer, timeStamp);
 553 #endif
 554 }
 555
 556 static void wakeup_dma_it_ctx(unsigned long l)
 557 {
 558         struct dma_iso_ctx *d = (struct dma_iso_ctx *) l;
 559         struct ti_ohci *ohci = d->ohci;
 560         int i;
 561
 562         spin_lock(&d->lock);
 563
 564         for (i = 0; i < d->num_desc; i++) {
 565                 if (d->it_prg[i][d->last_used_cmd[i]].end.status &
 566                     cpu_to_le32(0xFFFF0000)) {
 567                         int next = d->next_buffer[i];
 568                         put_timestamp(ohci, d, next);
 569                         d->it_prg[i][d->last_used_cmd[i]].end.status = 0;
 570                         d->buffer_status[d->buffer_prg_assignment[i]] = VIDEO1394_BUFFER_READY;
 571                 }
 572         }
 573
 574         spin_unlock(&d->lock);
 575
 576         if (waitqueue_active(&d->waitq))
 577                 wake_up_interruptible(&d->waitq);
 578 }
 579
 580 static void reprogram_dma_it_prg(struct dma_iso_ctx  *d, int n, int buffer)
 581 {
 582         struct it_dma_prg *it_prg = d->it_prg[n];
 583         unsigned long buf = (unsigned long)d->dma.kvirt + buffer * d->buf_size;
 584         int i;
 585
 586         d->buffer_prg_assignment[n] = buffer;
 587         for (i=0;i<d->nb_cmd;i++) {
 588           it_prg[i].end.address =
 589                 cpu_to_le32(dma_region_offset_to_bus(&d->dma,
 590                         (buf+i*d->packet_size) - (unsigned long)d->dma.kvirt));
 591         }
 592 }
 593
 594 static void initialize_dma_it_prg(struct dma_iso_ctx *d, int n, int sync_tag)
 595 {
 596         struct it_dma_prg *it_prg = d->it_prg[n];
 597         struct dma_prog_region *it_reg = &d->prg_reg[n];
 598         unsigned long buf = (unsigned long)d->dma.kvirt;
 599         int i;
 600         d->last_used_cmd[n] = d->nb_cmd - 1;
 601         for (i=0;i<d->nb_cmd;i++) {
 602
 603                 it_prg[i].begin.control = cpu_to_le32(DMA_CTL_OUTPUT_MORE |
 604                         DMA_CTL_IMMEDIATE | 8) ;
 605                 it_prg[i].begin.address = 0;
 606
 607                 it_prg[i].begin.status = 0;
 608
 609                 it_prg[i].data[0] = cpu_to_le32(
 610                         (IEEE1394_SPEED_100 << 16)
 611                         | (/* tag */ 1 << 14)
 612                         | (d->channel << 8)
 613                         | (TCODE_ISO_DATA << 4));
 614                 if (i==0) it_prg[i].data[0] |= cpu_to_le32(sync_tag);
 615                 it_prg[i].data[1] = cpu_to_le32(d->packet_size << 16);
 616                 it_prg[i].data[2] = 0;
 617                 it_prg[i].data[3] = 0;
 618
 619                 it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST |
 620                                              DMA_CTL_BRANCH);
 621                 it_prg[i].end.address =
 622                         cpu_to_le32(dma_region_offset_to_bus(&d->dma, (buf+i*d->packet_size) -
 623                                                 (unsigned long)d->dma.kvirt));
 624
 625                 if (i<d->nb_cmd-1) {
 626                         it_prg[i].end.control |= cpu_to_le32(d->packet_size);
 627                         it_prg[i].begin.branchAddress =
 628                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
 629                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
 630                         it_prg[i].end.branchAddress =
 631                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
 632                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
 633                 } else {
 634                         /* the last prg generates an interrupt */
 635                         it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
 636                                 DMA_CTL_IRQ | d->left_size);
 637                         /* the last prg doesn't branch */
 638                         it_prg[i].begin.branchAddress = 0;
 639                         it_prg[i].end.branchAddress = 0;
 640                 }
 641                 it_prg[i].end.status = 0;
 642         }
 643 }
 644
 645 static void initialize_dma_it_prg_var_packet_queue(
 646         struct dma_iso_ctx *d, int n, unsigned int * packet_sizes,
 647         struct ti_ohci *ohci)
 648 {
 649         struct it_dma_prg *it_prg = d->it_prg[n];
 650         struct dma_prog_region *it_reg = &d->prg_reg[n];
 651         int i;
 652
 653 #if 0
 654         if (n != -1) {
 655                 put_timestamp(ohci, d, n);
 656         }
 657 #endif
 658         d->last_used_cmd[n] = d->nb_cmd - 1;
 659
 660         for (i = 0; i < d->nb_cmd; i++) {
 661                 unsigned int size;
 662                 if (packet_sizes[i] > d->packet_size) {
 663                         size = d->packet_size;
 664                 } else {
 665                         size = packet_sizes[i];
 666                 }
 667                 it_prg[i].data[1] = cpu_to_le32(size << 16);
 668                 it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST | DMA_CTL_BRANCH);
 669
 670                 if (i < d->nb_cmd-1 && packet_sizes[i+1] != 0) {
 671                         it_prg[i].end.control |= cpu_to_le32(size);
 672                         it_prg[i].begin.branchAddress =
 673                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
 674                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
 675                         it_prg[i].end.branchAddress =
 676                                 cpu_to_le32((dma_prog_region_offset_to_bus(it_reg, (i + 1) *
 677                                         sizeof(struct it_dma_prg)) & 0xfffffff0) | 0x3);
 678                 } else {
 679                         /* the last prg generates an interrupt */
 680                         it_prg[i].end.control |= cpu_to_le32(DMA_CTL_UPDATE |
 681                                 DMA_CTL_IRQ | size);
 682                         /* the last prg doesn't branch */
 683                         it_prg[i].begin.branchAddress = 0;
 684                         it_prg[i].end.branchAddress = 0;
 685                         d->last_used_cmd[n] = i;
 686                         break;
 687                 }
 688         }
 689 }
 690
 691 static void initialize_dma_it_ctx(struct dma_iso_ctx *d, int sync_tag,
 692                                   unsigned int syt_offset, int flags)
 693 {
 694         struct ti_ohci *ohci = (struct ti_ohci *)d->ohci;
 695         int i;
 696
 697         d->flags = flags;
 698         d->syt_offset = (syt_offset == 0 ? 11000 : syt_offset);
 699
 700         ohci1394_stop_context(ohci, d->ctrlClear, NULL);
 701
 702         for (i=0;i<d->num_desc;i++)
 703                 initialize_dma_it_prg(d, i, sync_tag);
 704
 705         /* Set up isoRecvIntMask to generate interrupts */
 706         reg_write(ohci, OHCI1394_IsoXmitIntMaskSet, 1<<d->ctx);
 707 }
 708
 709 static inline unsigned video1394_buffer_state(struct dma_iso_ctx *d,
 710                                               unsigned int buffer)
 711 {
 712         unsigned long flags;
 713         unsigned int ret;
 714         spin_lock_irqsave(&d->lock, flags);
 715         ret = d->buffer_status[buffer];
 716         spin_unlock_irqrestore(&d->lock, flags);
 717         return ret;
 718 }
 719
 720 static long video1394_ioctl(struct file *file,
 721                             unsigned int cmd, unsigned long arg)
 722 {
 723         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
 724         struct ti_ohci *ohci = ctx->ohci;
 725         unsigned long flags;
 726         void __user *argp = (void __user *)arg;
 727
 728         switch(cmd)
 729         {
 730         case VIDEO1394_IOC_LISTEN_CHANNEL:
 731         case VIDEO1394_IOC_TALK_CHANNEL:
 732         {
 733                 struct video1394_mmap v;
 734                 u64 mask;
 735                 struct dma_iso_ctx *d;
 736                 int i;
 737
 738                 if (copy_from_user(&v, argp, sizeof(v)))
 739                         return -EFAULT;
 740
 741                 /* if channel < 0, find lowest available one */
 742                 if (v.channel < 0) {
 743                     mask = (u64)0x1;
 744                     for (i=0; ; i++) {
 745                         if (i == ISO_CHANNELS) {
 746                             PRINT(KERN_ERR, ohci->host->id,
 747                                   "No free channel found");
 748                             return -EAGAIN;
 749                         }
 750                         if (!(ohci->ISO_channel_usage & mask)) {
 751                             v.channel = i;
 752                             PRINT(KERN_INFO, ohci->host->id, "Found free channel %d", i);
 753                             break;
 754                         }
 755                         mask = mask << 1;
 756                     }
 757                 } else if (v.channel >= ISO_CHANNELS) {
 758                         PRINT(KERN_ERR, ohci->host->id,
 759                               "Iso channel %d out of bounds", v.channel);
 760                         return -EINVAL;
 761                 } else {
 762                         mask = (u64)0x1<<v.channel;
 763                 }
 764                 DBGMSG(ohci->host->id, "mask: %08X%08X usage: %08X%08X\n",
 765                         (u32)(mask>>32),(u32)(mask&0xffffffff),
 766                         (u32)(ohci->ISO_channel_usage>>32),
 767                         (u32)(ohci->ISO_channel_usage&0xffffffff));
 768                 if (ohci->ISO_channel_usage & mask) {
 769                         PRINT(KERN_ERR, ohci->host->id,
 770                               "Channel %d is already taken", v.channel);
 771                         return -EBUSY;
 772                 }
 773
 774                 if (v.buf_size == 0 || v.buf_size > VIDEO1394_MAX_SIZE) {
 775                         PRINT(KERN_ERR, ohci->host->id,
 776                               "Invalid %d length buffer requested",v.buf_size);
 777                         return -EINVAL;
 778                 }
 779
 780                 if (v.nb_buffers == 0 || v.nb_buffers > VIDEO1394_MAX_SIZE) {
 781                         PRINT(KERN_ERR, ohci->host->id,
 782                               "Invalid %d buffers requested",v.nb_buffers);
 783                         return -EINVAL;
 784                 }
 785
 786                 if (v.nb_buffers * v.buf_size > VIDEO1394_MAX_SIZE) {
 787                         PRINT(KERN_ERR, ohci->host->id,
 788                               "%d buffers of size %d bytes is too big",
 789                               v.nb_buffers, v.buf_size);
 790                         return -EINVAL;
 791                 }
 792
 793                 if (cmd == VIDEO1394_IOC_LISTEN_CHANNEL) {
 794                         d = alloc_dma_iso_ctx(ohci, OHCI_ISO_RECEIVE,
 795                                               v.nb_buffers + 1, v.buf_size,
 796                                               v.channel, 0);
 797
 798                         if (d == NULL) {
 799                                 PRINT(KERN_ERR, ohci->host->id,
 800                                       "Couldn't allocate ir context");
 801                                 return -EAGAIN;
 802                         }
 803                         initialize_dma_ir_ctx(d, v.sync_tag, v.flags);
 804
 805                         ctx->current_ctx = d;
 806
 807                         v.buf_size = d->buf_size;
 808                         list_add_tail(&d->link, &ctx->context_list);
 809
 810                         DBGMSG(ohci->host->id,
 811                               "iso context %d listen on channel %d",
 812                               d->ctx, v.channel);
 813                 }
 814                 else {
 815                         d = alloc_dma_iso_ctx(ohci, OHCI_ISO_TRANSMIT,
 816                                               v.nb_buffers + 1, v.buf_size,
 817                                               v.channel, v.packet_size);
 818
 819                         if (d == NULL) {
 820                                 PRINT(KERN_ERR, ohci->host->id,
 821                                       "Couldn't allocate it context");
 822                                 return -EAGAIN;
 823                         }
 824                         initialize_dma_it_ctx(d, v.sync_tag,
 825                                               v.syt_offset, v.flags);
 826
 827                         ctx->current_ctx = d;
 828
 829                         v.buf_size = d->buf_size;
 830
 831                         list_add_tail(&d->link, &ctx->context_list);
 832
 833                         DBGMSG(ohci->host->id,
 834                               "Iso context %d talk on channel %d", d->ctx,
 835                               v.channel);
 836                 }
 837
 838                 if (copy_to_user(argp, &v, sizeof(v))) {
 839                         /* FIXME : free allocated dma resources */
 840                         return -EFAULT;
 841                 }
 842
 843                 ohci->ISO_channel_usage |= mask;
 844
 845                 return 0;
 846         }
 847         case VIDEO1394_IOC_UNLISTEN_CHANNEL:
 848         case VIDEO1394_IOC_UNTALK_CHANNEL:
 849         {
 850                 int channel;
 851                 u64 mask;
 852                 struct dma_iso_ctx *d;
 853
 854                 if (copy_from_user(&channel, argp, sizeof(int)))
 855                         return -EFAULT;
 856
 857                 if (channel < 0 || channel >= ISO_CHANNELS) {
 858                         PRINT(KERN_ERR, ohci->host->id,
 859                               "Iso channel %d out of bound", channel);
 860                         return -EINVAL;
 861                 }
 862                 mask = (u64)0x1<<channel;
 863                 if (!(ohci->ISO_channel_usage & mask)) {
 864                         PRINT(KERN_ERR, ohci->host->id,
 865                               "Channel %d is not being used", channel);
 866                         return -ESRCH;
 867                 }
 868
 869                 /* Mark this channel as unused */
 870                 ohci->ISO_channel_usage &= ~mask;
 871
 872                 if (cmd == VIDEO1394_IOC_UNLISTEN_CHANNEL)
 873                         d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, channel);
 874                 else
 875                         d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, channel);
 876
 877                 if (d == NULL) return -ESRCH;
 878                 DBGMSG(ohci->host->id, "Iso context %d "
 879                       "stop talking on channel %d", d->ctx, channel);
 880                 free_dma_iso_ctx(d);
 881
 882                 return 0;
 883         }
 884         case VIDEO1394_IOC_LISTEN_QUEUE_BUFFER:
 885         {
 886                 struct video1394_wait v;
 887                 struct dma_iso_ctx *d;
 888                 int next_prg;
 889
 890                 if (unlikely(copy_from_user(&v, argp, sizeof(v))))
 891                         return -EFAULT;
 892
 893                 d = find_ctx(&ctx->context_list, OHCI_ISO_RECEIVE, v.channel);
 894                 if (unlikely(d == NULL))
 895                         return -EFAULT;
 896
 897                 if (unlikely((v.buffer<0) || (v.buffer>=d->num_desc - 1))) {
 898                         PRINT(KERN_ERR, ohci->host->id,
 899                               "Buffer %d out of range",v.buffer);
 900                         return -EINVAL;
 901                 }
 902
 903                 spin_lock_irqsave(&d->lock,flags);
 904
 905                 if (unlikely(d->buffer_status[v.buffer]==VIDEO1394_BUFFER_QUEUED)) {
 906                         PRINT(KERN_ERR, ohci->host->id,
 907                               "Buffer %d is already used",v.buffer);
 908                         spin_unlock_irqrestore(&d->lock,flags);
 909                         return -EBUSY;
 910                 }
 911
 912                 d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
 913
 914                 next_prg = (d->last_buffer + 1) % d->num_desc;
 915                 if (d->last_buffer>=0)
 916                         d->ir_prg[d->last_buffer][d->nb_cmd-1].branchAddress =
 917                                 cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg], 0)
 918                                         & 0xfffffff0) | 0x1);
 919
 920                 d->last_buffer = next_prg;
 921                 reprogram_dma_ir_prg(d, d->last_buffer, v.buffer, d->flags);
 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[d->last_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                                 DBGMSG(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 = 0;
 955
 956                 if (unlikely(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 (unlikely(d == NULL))
 961                         return -EFAULT;
 962
 963                 if (unlikely((v.buffer<0) || (v.buffer>d->num_desc - 1))) {
 964                         PRINT(KERN_ERR, ohci->host->id,
 965                               "Buffer %d out of range",v.buffer);
 966                         return -EINVAL;
 967                 }
 968
 969                 /*
 970                  * I change the way it works so that it returns
 971                  * the last received frame.
 972                  */
 973                 spin_lock_irqsave(&d->lock, flags);
 974                 switch(d->buffer_status[v.buffer]) {
 975                 case VIDEO1394_BUFFER_READY:
 976                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
 977                         break;
 978                 case VIDEO1394_BUFFER_QUEUED:
 979                         if (cmd == VIDEO1394_IOC_LISTEN_POLL_BUFFER) {
 980                             /* for polling, return error code EINTR */
 981                             spin_unlock_irqrestore(&d->lock, flags);
 982                             return -EINTR;
 983                         }
 984
 985                         spin_unlock_irqrestore(&d->lock, flags);
 986                         wait_event_interruptible(d->waitq,
 987                                         video1394_buffer_state(d, v.buffer) ==
 988                                          VIDEO1394_BUFFER_READY);
 989                         if (signal_pending(current))
 990                                 return -EINTR;
 991                         spin_lock_irqsave(&d->lock, flags);
 992                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
 993                         break;
 994                 default:
 995                         PRINT(KERN_ERR, ohci->host->id,
 996                               "Buffer %d is not queued",v.buffer);
 997                         spin_unlock_irqrestore(&d->lock, flags);
 998                         return -ESRCH;
 999                 }
1000
1001                 /* set time of buffer */
1002                 v.filltime = d->buffer_time[v.buffer];
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 - 1)]==
1009                        VIDEO1394_BUFFER_READY) {
1010                         v.buffer=(v.buffer+1)%(d->num_desc - 1);
1011                         i++;
1012                 }
1013                 spin_unlock_irqrestore(&d->lock, flags);
1014
1015                 v.buffer=i;
1016                 if (unlikely(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                 int next_prg;
1027
1028                 if (copy_from_user(&v, argp, sizeof(v)))
1029                         return -EFAULT;
1030
1031                 d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
1032                 if (d == NULL) return -EFAULT;
1033
1034                 if ((v.buffer<0) || (v.buffer>=d->num_desc - 1)) {
1035                         PRINT(KERN_ERR, ohci->host->id,
1036                               "Buffer %d out of range",v.buffer);
1037                         return -EINVAL;
1038                 }
1039
1040                 if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
1041                         int buf_size = d->nb_cmd * sizeof(*psizes);
1042                         struct video1394_queue_variable __user *p = argp;
1043                         unsigned int __user *qv;
1044
1045                         if (get_user(qv, &p->packet_sizes))
1046                                 return -EFAULT;
1047
1048                         psizes = kmalloc(buf_size, GFP_KERNEL);
1049                         if (!psizes)
1050                                 return -ENOMEM;
1051
1052                         if (copy_from_user(psizes, qv, buf_size)) {
1053                                 kfree(psizes);
1054                                 return -EFAULT;
1055                         }
1056                 }
1057
1058                 spin_lock_irqsave(&d->lock,flags);
1059
1060                 /* last_buffer is last_prg */
1061                 next_prg = (d->last_buffer + 1) % d->num_desc;
1062                 if (d->buffer_status[v.buffer]!=VIDEO1394_BUFFER_FREE) {
1063                         PRINT(KERN_ERR, ohci->host->id,
1064                               "Buffer %d is already used",v.buffer);
1065                         spin_unlock_irqrestore(&d->lock,flags);
1066                         kfree(psizes);
1067                         return -EBUSY;
1068                 }
1069
1070                 if (d->flags & VIDEO1394_VARIABLE_PACKET_SIZE) {
1071                         initialize_dma_it_prg_var_packet_queue(
1072                                 d, next_prg, psizes, ohci);
1073                 }
1074
1075                 d->buffer_status[v.buffer]=VIDEO1394_BUFFER_QUEUED;
1076
1077                 if (d->last_buffer >= 0) {
1078                         d->it_prg[d->last_buffer]
1079                                 [ d->last_used_cmd[d->last_buffer] ].end.branchAddress =
1080                                         cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg],
1081                                                 0) & 0xfffffff0) | 0x3);
1082
1083                         d->it_prg[d->last_buffer]
1084                                 [ d->last_used_cmd[d->last_buffer] ].begin.branchAddress =
1085                                         cpu_to_le32((dma_prog_region_offset_to_bus(&d->prg_reg[next_prg],
1086                                                 0) & 0xfffffff0) | 0x3);
1087                         d->next_buffer[d->last_buffer] = (v.buffer + 1) % (d->num_desc - 1);
1088                 }
1089                 d->last_buffer = next_prg;
1090                 reprogram_dma_it_prg(d, d->last_buffer, v.buffer);
1091                 d->next_buffer[d->last_buffer] = -1;
1092
1093                 d->it_prg[d->last_buffer][d->last_used_cmd[d->last_buffer]].end.branchAddress = 0;
1094
1095                 spin_unlock_irqrestore(&d->lock,flags);
1096
1097                 if (!(reg_read(ohci, d->ctrlSet) & 0x8000))
1098                 {
1099                         DBGMSG(ohci->host->id, "Starting iso transmit DMA ctx=%d",
1100                                d->ctx);
1101                         put_timestamp(ohci, d, d->last_buffer);
1102                         dma_region_sync_for_device(&d->dma,
1103                                 v.buffer * d->buf_size, d->buf_size);
1104
1105                         /* Tell the controller where the first program is */
1106                         reg_write(ohci, d->cmdPtr,
1107                                 dma_prog_region_offset_to_bus(&d->prg_reg[next_prg], 0) | 0x3);
1108
1109                         /* Run IT context */
1110                         reg_write(ohci, d->ctrlSet, 0x8000);
1111                 }
1112                 else {
1113                         /* Wake up dma context if necessary */
1114                         if (!(reg_read(ohci, d->ctrlSet) & 0x400)) {
1115                                 DBGMSG(ohci->host->id,
1116                                       "Waking up iso transmit dma ctx=%d",
1117                                       d->ctx);
1118                                 put_timestamp(ohci, d, d->last_buffer);
1119                                 dma_region_sync_for_device(&d->dma,
1120                                         v.buffer * d->buf_size, d->buf_size);
1121
1122                                 reg_write(ohci, d->ctrlSet, 0x1000);
1123                         }
1124                 }
1125
1126                 kfree(psizes);
1127                 return 0;
1128
1129         }
1130         case VIDEO1394_IOC_TALK_WAIT_BUFFER:
1131         {
1132                 struct video1394_wait v;
1133                 struct dma_iso_ctx *d;
1134
1135                 if (copy_from_user(&v, argp, sizeof(v)))
1136                         return -EFAULT;
1137
1138                 d = find_ctx(&ctx->context_list, OHCI_ISO_TRANSMIT, v.channel);
1139                 if (d == NULL) return -EFAULT;
1140
1141                 if ((v.buffer<0) || (v.buffer>=d->num_desc-1)) {
1142                         PRINT(KERN_ERR, ohci->host->id,
1143                               "Buffer %d out of range",v.buffer);
1144                         return -EINVAL;
1145                 }
1146
1147                 switch(d->buffer_status[v.buffer]) {
1148                 case VIDEO1394_BUFFER_READY:
1149                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
1150                         return 0;
1151                 case VIDEO1394_BUFFER_QUEUED:
1152                         wait_event_interruptible(d->waitq,
1153                                         (d->buffer_status[v.buffer] == VIDEO1394_BUFFER_READY));
1154                         if (signal_pending(current))
1155                                 return -EINTR;
1156                         d->buffer_status[v.buffer]=VIDEO1394_BUFFER_FREE;
1157                         return 0;
1158                 default:
1159                         PRINT(KERN_ERR, ohci->host->id,
1160                               "Buffer %d is not queued",v.buffer);
1161                         return -ESRCH;
1162                 }
1163         }
1164         default:
1165                 return -ENOTTY;
1166         }
1167 }
1168
1169 /*
1170  *      This maps the vmalloced and reserved buffer to user space.
1171  *
1172  *  FIXME:
1173  *  - PAGE_READONLY should suffice!?
1174  *  - remap_pfn_range is kind of inefficient for page by page remapping.
1175  *    But e.g. pte_alloc() does not work in modules ... :-(
1176  */
1177
1178 static int video1394_mmap(struct file *file, struct vm_area_struct *vma)
1179 {
1180         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
1181
1182         if (ctx->current_ctx == NULL) {
1183                 PRINT(KERN_ERR, ctx->ohci->host->id,
1184                                 "Current iso context not set");
1185                 return -EINVAL;
1186         }
1187
1188         return dma_region_mmap(&ctx->current_ctx->dma, file, vma);
1189 }
1190
1191 static unsigned int video1394_poll(struct file *file, poll_table *pt)
1192 {
1193         struct file_ctx *ctx;
1194         unsigned int mask = 0;
1195         unsigned long flags;
1196         struct dma_iso_ctx *d;
1197         int i;
1198
1199         ctx = file->private_data;
1200         d = ctx->current_ctx;
1201         if (d == NULL) {
1202                 PRINT(KERN_ERR, ctx->ohci->host->id,
1203                                 "Current iso context not set");
1204                 return POLLERR;
1205         }
1206
1207         poll_wait(file, &d->waitq, pt);
1208
1209         spin_lock_irqsave(&d->lock, flags);
1210         for (i = 0; i < d->num_desc; i++) {
1211                 if (d->buffer_status[i] == VIDEO1394_BUFFER_READY) {
1212                         mask |= POLLIN | POLLRDNORM;
1213                         break;
1214                 }
1215         }
1216         spin_unlock_irqrestore(&d->lock, flags);
1217
1218         return mask;
1219 }
1220
1221 static int video1394_open(struct inode *inode, struct file *file)
1222 {
1223         int i = ieee1394_file_to_instance(file);
1224         struct ti_ohci *ohci;
1225         struct file_ctx *ctx;
1226
1227         ohci = hpsb_get_hostinfo_bykey(&video1394_highlevel, i);
1228         if (ohci == NULL)
1229                 return -EIO;
1230
1231         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1232         if (!ctx)  {
1233                 PRINT(KERN_ERR, ohci->host->id, "Cannot malloc file_ctx");
1234                 return -ENOMEM;
1235         }
1236
1237         ctx->ohci = ohci;
1238         INIT_LIST_HEAD(&ctx->context_list);
1239         ctx->current_ctx = NULL;
1240         file->private_data = ctx;
1241
1242         return 0;
1243 }
1244
1245 static int video1394_release(struct inode *inode, struct file *file)
1246 {
1247         struct file_ctx *ctx = (struct file_ctx *)file->private_data;
1248         struct ti_ohci *ohci = ctx->ohci;
1249         struct list_head *lh, *next;
1250         u64 mask;
1251
1252         list_for_each_safe(lh, next, &ctx->context_list) {
1253                 struct dma_iso_ctx *d;
1254                 d = list_entry(lh, struct dma_iso_ctx, link);
1255                 mask = (u64) 1 << d->channel;
1256
1257                 if (!(ohci->ISO_channel_usage & mask))
1258                         PRINT(KERN_ERR, ohci->host->id, "On release: Channel %d "
1259                               "is not being used", d->channel);
1260                 else
1261                         ohci->ISO_channel_usage &= ~mask;
1262                 DBGMSG(ohci->host->id, "On release: Iso %s context "
1263                       "%d stop listening on channel %d",
1264                       d->type == OHCI_ISO_RECEIVE ? "receive" : "transmit",
1265                       d->ctx, d->channel);
1266                 free_dma_iso_ctx(d);
1267         }
1268
1269         kfree(ctx);
1270         file->private_data = NULL;
1271
1272         return 0;
1273 }
1274
1275 #ifdef CONFIG_COMPAT
1276 static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg);
1277 #endif
1278
1279 static struct cdev video1394_cdev;
1280 static const struct file_operations video1394_fops=
1281 {
1282         .owner =        THIS_MODULE,
1283         .unlocked_ioctl = video1394_ioctl,
1284 #ifdef CONFIG_COMPAT
1285         .compat_ioctl = video1394_compat_ioctl,
1286 #endif
1287         .poll =         video1394_poll,
1288         .mmap =         video1394_mmap,
1289         .open =         video1394_open,
1290         .release =      video1394_release
1291 };
1292
1293 /*** HOTPLUG STUFF **********************************************************/
1294 /*
1295  * Export information about protocols/devices supported by this driver.
1296  */
1297 static struct ieee1394_device_id video1394_id_table[] = {
1298         {
1299                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1300                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1301                 .version        = CAMERA_SW_VERSION_ENTRY & 0xffffff
1302         },
1303         {
1304                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1305                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1306                 .version        = (CAMERA_SW_VERSION_ENTRY + 1) & 0xffffff
1307         },
1308         {
1309                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
1310                 .specifier_id   = CAMERA_UNIT_SPEC_ID_ENTRY & 0xffffff,
1311                 .version        = (CAMERA_SW_VERSION_ENTRY + 2) & 0xffffff
1312         },
1313         { }
1314 };
1315
1316 MODULE_DEVICE_TABLE(ieee1394, video1394_id_table);
1317
1318 static struct hpsb_protocol_driver video1394_driver = {
1319         .name           = VIDEO1394_DRIVER_NAME,
1320         .id_table       = video1394_id_table,
1321 };
1322
1323
1324 static void video1394_add_host (struct hpsb_host *host)
1325 {
1326         struct ti_ohci *ohci;
1327         int minor;
1328
1329         /* We only work with the OHCI-1394 driver */
1330         if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
1331                 return;
1332
1333         ohci = (struct ti_ohci *)host->hostdata;
1334
1335         if (!hpsb_create_hostinfo(&video1394_highlevel, host, 0)) {
1336                 PRINT(KERN_ERR, ohci->host->id, "Cannot allocate hostinfo");
1337                 return;
1338         }
1339
1340         hpsb_set_hostinfo(&video1394_highlevel, host, ohci);
1341         hpsb_set_hostinfo_key(&video1394_highlevel, host, ohci->host->id);
1342
1343         minor = IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id;
1344         class_device_create(hpsb_protocol_class, NULL, MKDEV(
1345                 IEEE1394_MAJOR, minor),
1346                 NULL, "%s-%d", VIDEO1394_DRIVER_NAME, ohci->host->id);
1347 }
1348
1349
1350 static void video1394_remove_host (struct hpsb_host *host)
1351 {
1352         struct ti_ohci *ohci = hpsb_get_hostinfo(&video1394_highlevel, host);
1353
1354         if (ohci)
1355                 class_device_destroy(hpsb_protocol_class, MKDEV(IEEE1394_MAJOR,
1356                         IEEE1394_MINOR_BLOCK_VIDEO1394 * 16 + ohci->host->id));
1357         return;
1358 }
1359
1360
1361 static struct hpsb_highlevel video1394_highlevel = {
1362         .name =         VIDEO1394_DRIVER_NAME,
1363         .add_host =     video1394_add_host,
1364         .remove_host =  video1394_remove_host,
1365 };
1366
1367 MODULE_AUTHOR("Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>");
1368 MODULE_DESCRIPTION("driver for digital video on OHCI board");
1369 MODULE_SUPPORTED_DEVICE(VIDEO1394_DRIVER_NAME);
1370 MODULE_LICENSE("GPL");
1371
1372 #ifdef CONFIG_COMPAT
1373
1374 #define VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER     \
1375         _IOW ('#', 0x12, struct video1394_wait32)
1376 #define VIDEO1394_IOC32_LISTEN_WAIT_BUFFER      \
1377         _IOWR('#', 0x13, struct video1394_wait32)
1378 #define VIDEO1394_IOC32_TALK_WAIT_BUFFER        \
1379         _IOW ('#', 0x17, struct video1394_wait32)
1380 #define VIDEO1394_IOC32_LISTEN_POLL_BUFFER      \
1381         _IOWR('#', 0x18, struct video1394_wait32)
1382
1383 struct video1394_wait32 {
1384         u32 channel;
1385         u32 buffer;
1386         struct compat_timeval filltime;
1387 };
1388
1389 static int video1394_wr_wait32(struct file *file, unsigned int cmd, unsigned long arg)
1390 {
1391         struct video1394_wait32 __user *argp = (void __user *)arg;
1392         struct video1394_wait32 wait32;
1393         struct video1394_wait wait;
1394         mm_segment_t old_fs;
1395         int ret;
1396
1397         if (copy_from_user(&wait32, argp, sizeof(wait32)))
1398                 return -EFAULT;
1399
1400         wait.channel = wait32.channel;
1401         wait.buffer = wait32.buffer;
1402         wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
1403         wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
1404
1405         old_fs = get_fs();
1406         set_fs(KERNEL_DS);
1407         if (cmd == VIDEO1394_IOC32_LISTEN_WAIT_BUFFER)
1408                 ret = video1394_ioctl(file,
1409                                       VIDEO1394_IOC_LISTEN_WAIT_BUFFER,
1410                                       (unsigned long) &wait);
1411         else
1412                 ret = video1394_ioctl(file,
1413                                       VIDEO1394_IOC_LISTEN_POLL_BUFFER,
1414                                       (unsigned long) &wait);
1415         set_fs(old_fs);
1416
1417         if (!ret) {
1418                 wait32.channel = wait.channel;
1419                 wait32.buffer = wait.buffer;
1420                 wait32.filltime.tv_sec = (int)wait.filltime.tv_sec;
1421                 wait32.filltime.tv_usec = (int)wait.filltime.tv_usec;
1422
1423                 if (copy_to_user(argp, &wait32, sizeof(wait32)))
1424                         ret = -EFAULT;
1425         }
1426
1427         return ret;
1428 }
1429
1430 static int video1394_w_wait32(struct file *file, unsigned int cmd, unsigned long arg)
1431 {
1432         struct video1394_wait32 wait32;
1433         struct video1394_wait wait;
1434         mm_segment_t old_fs;
1435         int ret;
1436
1437         if (copy_from_user(&wait32, (void __user *)arg, sizeof(wait32)))
1438                 return -EFAULT;
1439
1440         wait.channel = wait32.channel;
1441         wait.buffer = wait32.buffer;
1442         wait.filltime.tv_sec = (time_t)wait32.filltime.tv_sec;
1443         wait.filltime.tv_usec = (suseconds_t)wait32.filltime.tv_usec;
1444
1445         old_fs = get_fs();
1446         set_fs(KERNEL_DS);
1447         if (cmd == VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER)
1448                 ret = video1394_ioctl(file,
1449                                       VIDEO1394_IOC_LISTEN_QUEUE_BUFFER,
1450                                       (unsigned long) &wait);
1451         else
1452                 ret = video1394_ioctl(file,
1453                                       VIDEO1394_IOC_TALK_WAIT_BUFFER,
1454                                       (unsigned long) &wait);
1455         set_fs(old_fs);
1456
1457         return ret;
1458 }
1459
1460 static int video1394_queue_buf32(struct file *file, unsigned int cmd, unsigned long arg)
1461 {
1462         return -EFAULT;   /* ??? was there before. */
1463
1464         return video1394_ioctl(file,
1465                                 VIDEO1394_IOC_TALK_QUEUE_BUFFER, arg);
1466 }
1467
1468 static long video1394_compat_ioctl(struct file *f, unsigned cmd, unsigned long arg)
1469 {
1470         switch (cmd) {
1471         case VIDEO1394_IOC_LISTEN_CHANNEL:
1472         case VIDEO1394_IOC_UNLISTEN_CHANNEL:
1473         case VIDEO1394_IOC_TALK_CHANNEL:
1474         case VIDEO1394_IOC_UNTALK_CHANNEL:
1475                 return video1394_ioctl(f, cmd, arg);
1476
1477         case VIDEO1394_IOC32_LISTEN_QUEUE_BUFFER:
1478                 return video1394_w_wait32(f, cmd, arg);
1479         case VIDEO1394_IOC32_LISTEN_WAIT_BUFFER:
1480                 return video1394_wr_wait32(f, cmd, arg);
1481         case VIDEO1394_IOC_TALK_QUEUE_BUFFER:
1482                 return video1394_queue_buf32(f, cmd, arg);
1483         case VIDEO1394_IOC32_TALK_WAIT_BUFFER:
1484                 return video1394_w_wait32(f, cmd, arg);
1485         case VIDEO1394_IOC32_LISTEN_POLL_BUFFER:
1486                 return video1394_wr_wait32(f, cmd, arg);
1487         default:
1488                 return -ENOIOCTLCMD;
1489         }
1490 }
1491
1492 #endif /* CONFIG_COMPAT */
1493
1494 static void __exit video1394_exit_module (void)
1495 {
1496         hpsb_unregister_protocol(&video1394_driver);
1497         hpsb_unregister_highlevel(&video1394_highlevel);
1498         cdev_del(&video1394_cdev);
1499         PRINT_G(KERN_INFO, "Removed " VIDEO1394_DRIVER_NAME " module");
1500 }
1501
1502 static int __init video1394_init_module (void)
1503 {
1504         int ret;
1505
1506         cdev_init(&video1394_cdev, &video1394_fops);
1507         video1394_cdev.owner = THIS_MODULE;
1508         kobject_set_name(&video1394_cdev.kobj, VIDEO1394_DRIVER_NAME);
1509         ret = cdev_add(&video1394_cdev, IEEE1394_VIDEO1394_DEV, 16);
1510         if (ret) {
1511                 PRINT_G(KERN_ERR, "video1394: unable to get minor device block");
1512                 return ret;
1513         }
1514
1515         hpsb_register_highlevel(&video1394_highlevel);
1516
1517         ret = hpsb_register_protocol(&video1394_driver);
1518         if (ret) {
1519                 PRINT_G(KERN_ERR, "video1394: failed to register protocol");
1520                 hpsb_unregister_highlevel(&video1394_highlevel);
1521                 cdev_del(&video1394_cdev);
1522                 return ret;
1523         }
1524
1525         PRINT_G(KERN_INFO, "Installed " VIDEO1394_DRIVER_NAME " module");
1526         return 0;
1527 }
1528
1529
1530 module_init(video1394_init_module);
1531 module_exit(video1394_exit_module);