git.oblomov.eu Git - linux-2.6/blob - drivers/ieee1394/dv1394.c

   1 /*
   2  * dv1394.c - DV input/output over IEEE 1394 on OHCI chips
   3  *   Copyright (C)2001 Daniel Maas <dmaas@dcine.com>
   4  *     receive by Dan Dennedy <dan@dennedy.org>
   5  *
   6  * based on:
   7  *  video1394.c - video driver for OHCI 1394 boards
   8  *  Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  */
  24
  25 /*
  26   OVERVIEW
  27
  28   I designed dv1394 as a "pipe" that you can use to shoot DV onto a
  29   FireWire bus. In transmission mode, dv1394 does the following:
  30
  31    1. accepts contiguous frames of DV data from user-space, via write()
  32       or mmap() (see dv1394.h for the complete API)
  33    2. wraps IEC 61883 packets around the DV data, inserting
  34       empty synchronization packets as necessary
  35    3. assigns accurate SYT timestamps to the outgoing packets
  36    4. shoots them out using the OHCI card's IT DMA engine
  37
  38    Thanks to Dan Dennedy, we now have a receive mode that does the following:
  39
  40    1. accepts raw IEC 61883 packets from the OHCI card
  41    2. re-assembles the DV data payloads into contiguous frames,
  42       discarding empty packets
  43    3. sends the DV data to user-space via read() or mmap()
  44 */
  45
  46 /*
  47   TODO:
  48
  49   - tunable frame-drop behavior: either loop last frame, or halt transmission
  50
  51   - use a scatter/gather buffer for DMA programs (f->descriptor_pool)
  52     so that we don't rely on allocating 64KB of contiguous kernel memory
  53     via pci_alloc_consistent()
  54
  55   DONE:
  56   - during reception, better handling of dropped frames and continuity errors
  57   - during reception, prevent DMA from bypassing the irq tasklets
  58   - reduce irq rate during reception (1/250 packets).
  59   - add many more internal buffers during reception with scatter/gather dma.
  60   - add dbc (continuity) checking on receive, increment status.dropped_frames
  61     if not continuous.
  62   - restart IT DMA after a bus reset
  63   - safely obtain and release ISO Tx channels in cooperation with OHCI driver
  64   - map received DIF blocks to their proper location in DV frame (ensure
  65     recovery if dropped packet)
  66   - handle bus resets gracefully (OHCI card seems to take care of this itself(!))
  67   - do not allow resizing the user_buf once allocated; eliminate nuke_buffer_mappings
  68   - eliminated #ifdef DV1394_DEBUG_LEVEL by inventing macros debug_printk and irq_printk
  69   - added wmb() and mb() to places where PCI read/write ordering needs to be enforced
  70   - set video->id correctly
  71   - store video_cards in an array indexed by OHCI card ID, rather than a list
  72   - implement DMA context allocation to cooperate with other users of the OHCI
  73   - fix all XXX showstoppers
  74   - disable IR/IT DMA interrupts on shutdown
  75   - flush pci writes to the card by issuing a read
  76   - character device dispatching
  77   - switch over to the new kernel DMA API (pci_map_*()) (* needs testing on platforms with IOMMU!)
  78   - keep all video_cards in a list (for open() via chardev), set file->private_data = video
  79   - dv1394_poll should indicate POLLIN when receiving buffers are available
  80   - add proc fs interface to set cip_n, cip_d, syt_offset, and video signal
  81   - expose xmit and recv as separate devices (not exclusive)
  82   - expose NTSC and PAL as separate devices (can be overridden)
  83
  84 */
  85
  86 #include <linux/kernel.h>
  87 #include <linux/list.h>
  88 #include <linux/slab.h>
  89 #include <linux/interrupt.h>
  90 #include <linux/wait.h>
  91 #include <linux/errno.h>
  92 #include <linux/module.h>
  93 #include <linux/init.h>
  94 #include <linux/pci.h>
  95 #include <linux/fs.h>
  96 #include <linux/poll.h>
  97 #include <linux/mutex.h>
  98 #include <linux/bitops.h>
  99 #include <asm/byteorder.h>
 100 #include <asm/atomic.h>
 101 #include <asm/io.h>
 102 #include <asm/uaccess.h>
 103 #include <linux/delay.h>
 104 #include <asm/pgtable.h>
 105 #include <asm/page.h>
 106 #include <linux/sched.h>
 107 #include <linux/types.h>
 108 #include <linux/vmalloc.h>
 109 #include <linux/string.h>
 110 #include <linux/compat.h>
 111 #include <linux/cdev.h>
 112
 113 #include "dv1394.h"
 114 #include "dv1394-private.h"
 115 #include "highlevel.h"
 116 #include "hosts.h"
 117 #include "ieee1394.h"
 118 #include "ieee1394_core.h"
 119 #include "ieee1394_hotplug.h"
 120 #include "ieee1394_types.h"
 121 #include "nodemgr.h"
 122 #include "ohci1394.h"
 123
 124 /* DEBUG LEVELS:
 125    0 - no debugging messages
 126    1 - some debugging messages, but none during DMA frame transmission
 127    2 - lots of messages, including during DMA frame transmission
 128        (will cause undeflows if your machine is too slow!)
 129 */
 130
 131 #define DV1394_DEBUG_LEVEL 0
 132
 133 /* for debugging use ONLY: allow more than one open() of the device */
 134 /* #define DV1394_ALLOW_MORE_THAN_ONE_OPEN 1 */
 135
 136 #if DV1394_DEBUG_LEVEL >= 2
 137 #define irq_printk( args... ) printk( args )
 138 #else
 139 #define irq_printk( args... ) do {} while (0)
 140 #endif
 141
 142 #if DV1394_DEBUG_LEVEL >= 1
 143 #define debug_printk( args... ) printk( args)
 144 #else
 145 #define debug_printk( args... ) do {} while (0)
 146 #endif
 147
 148 /* issue a dummy PCI read to force the preceding write
 149    to be posted to the PCI bus immediately */
 150
 151 static inline void flush_pci_write(struct ti_ohci *ohci)
 152 {
 153         mb();
 154         reg_read(ohci, OHCI1394_IsochronousCycleTimer);
 155 }
 156
 157 static void it_tasklet_func(unsigned long data);
 158 static void ir_tasklet_func(unsigned long data);
 159
 160 #ifdef CONFIG_COMPAT
 161 static long dv1394_compat_ioctl(struct file *file, unsigned int cmd,
 162                                unsigned long arg);
 163 #endif
 164
 165 /* GLOBAL DATA */
 166
 167 /* list of all video_cards */
 168 static LIST_HEAD(dv1394_cards);
 169 static DEFINE_SPINLOCK(dv1394_cards_lock);
 170
 171 /* translate from a struct file* to the corresponding struct video_card* */
 172
 173 static inline struct video_card* file_to_video_card(struct file *file)
 174 {
 175         return (struct video_card*) file->private_data;
 176 }
 177
 178 /*** FRAME METHODS *********************************************************/
 179
 180 static void frame_reset(struct frame *f)
 181 {
 182         f->state = FRAME_CLEAR;
 183         f->done = 0;
 184         f->n_packets = 0;
 185         f->frame_begin_timestamp = NULL;
 186         f->assigned_timestamp = 0;
 187         f->cip_syt1 = NULL;
 188         f->cip_syt2 = NULL;
 189         f->mid_frame_timestamp = NULL;
 190         f->frame_end_timestamp = NULL;
 191         f->frame_end_branch = NULL;
 192 }
 193
 194 static struct frame* frame_new(unsigned int frame_num, struct video_card *video)
 195 {
 196         struct frame *f = kmalloc(sizeof(*f), GFP_KERNEL);
 197         if (!f)
 198                 return NULL;
 199
 200         f->video = video;
 201         f->frame_num = frame_num;
 202
 203         f->header_pool = pci_alloc_consistent(f->video->ohci->dev, PAGE_SIZE, &f->header_pool_dma);
 204         if (!f->header_pool) {
 205                 printk(KERN_ERR "dv1394: failed to allocate CIP header pool\n");
 206                 kfree(f);
 207                 return NULL;
 208         }
 209
 210         debug_printk("dv1394: frame_new: allocated CIP header pool at virt 0x%08lx (contig) dma 0x%08lx size %ld\n",
 211                      (unsigned long) f->header_pool, (unsigned long) f->header_pool_dma, PAGE_SIZE);
 212
 213         f->descriptor_pool_size = MAX_PACKETS * sizeof(struct DMA_descriptor_block);
 214         /* make it an even # of pages */
 215         f->descriptor_pool_size += PAGE_SIZE - (f->descriptor_pool_size%PAGE_SIZE);
 216
 217         f->descriptor_pool = pci_alloc_consistent(f->video->ohci->dev,
 218                                                   f->descriptor_pool_size,
 219                                                   &f->descriptor_pool_dma);
 220         if (!f->descriptor_pool) {
 221                 pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma);
 222                 kfree(f);
 223                 return NULL;
 224         }
 225
 226         debug_printk("dv1394: frame_new: allocated DMA program memory at virt 0x%08lx (contig) dma 0x%08lx size %ld\n",
 227                      (unsigned long) f->descriptor_pool, (unsigned long) f->descriptor_pool_dma, f->descriptor_pool_size);
 228
 229         f->data = 0;
 230         frame_reset(f);
 231
 232         return f;
 233 }
 234
 235 static void frame_delete(struct frame *f)
 236 {
 237         pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma);
 238         pci_free_consistent(f->video->ohci->dev, f->descriptor_pool_size, f->descriptor_pool, f->descriptor_pool_dma);
 239         kfree(f);
 240 }
 241
 242
 243
 244
 245 /*
 246    frame_prepare() - build the DMA program for transmitting
 247
 248    Frame_prepare() must be called OUTSIDE the video->spinlock.
 249    However, frame_prepare() must still be serialized, so
 250    it should be called WITH the video->mtx taken.
 251  */
 252
 253 static void frame_prepare(struct video_card *video, unsigned int this_frame)
 254 {
 255         struct frame *f = video->frames[this_frame];
 256         int last_frame;
 257
 258         struct DMA_descriptor_block *block;
 259         dma_addr_t block_dma;
 260         struct CIP_header *cip;
 261         dma_addr_t cip_dma;
 262
 263         unsigned int n_descriptors, full_packets, packets_per_frame, payload_size;
 264
 265         /* these flags denote packets that need special attention */
 266         int empty_packet, first_packet, last_packet, mid_packet;
 267
 268         __le32 *branch_address, *last_branch_address = NULL;
 269         unsigned long data_p;
 270         int first_packet_empty = 0;
 271         u32 cycleTimer, ct_sec, ct_cyc, ct_off;
 272         unsigned long irq_flags;
 273
 274         irq_printk("frame_prepare( %d ) ---------------------\n", this_frame);
 275
 276         full_packets = 0;
 277
 278
 279
 280         if (video->pal_or_ntsc == DV1394_PAL)
 281                 packets_per_frame = DV1394_PAL_PACKETS_PER_FRAME;
 282         else
 283                 packets_per_frame = DV1394_NTSC_PACKETS_PER_FRAME;
 284
 285         while ( full_packets < packets_per_frame ) {
 286                 empty_packet = first_packet = last_packet = mid_packet = 0;
 287
 288                 data_p = f->data + full_packets * 480;
 289
 290                 /************************************************/
 291                 /* allocate a descriptor block and a CIP header */
 292                 /************************************************/
 293
 294                 /* note: these should NOT cross a page boundary (DMA restriction) */
 295
 296                 if (f->n_packets >= MAX_PACKETS) {
 297                         printk(KERN_ERR "dv1394: FATAL ERROR: max packet count exceeded\n");
 298                         return;
 299                 }
 300
 301                 /* the block surely won't cross a page boundary,
 302                    since an even number of descriptor_blocks fit on a page */
 303                 block = &(f->descriptor_pool[f->n_packets]);
 304
 305                 /* DMA address of the block = offset of block relative
 306                     to the kernel base address of the descriptor pool
 307                     + DMA base address of the descriptor pool */
 308                 block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
 309
 310
 311                 /* the whole CIP pool fits on one page, so no worries about boundaries */
 312                 if ( ((unsigned long) &(f->header_pool[f->n_packets]) - (unsigned long) f->header_pool)
 313                     > PAGE_SIZE) {
 314                         printk(KERN_ERR "dv1394: FATAL ERROR: no room to allocate CIP header\n");
 315                         return;
 316                 }
 317
 318                 cip = &(f->header_pool[f->n_packets]);
 319
 320                 /* DMA address of the CIP header = offset of cip
 321                    relative to kernel base address of the header pool
 322                    + DMA base address of the header pool */
 323                 cip_dma = (unsigned long) cip % PAGE_SIZE + f->header_pool_dma;
 324
 325                 /* is this an empty packet? */
 326
 327                 if (video->cip_accum > (video->cip_d - video->cip_n)) {
 328                         empty_packet = 1;
 329                         payload_size = 8;
 330                         video->cip_accum -= (video->cip_d - video->cip_n);
 331                 } else {
 332                         payload_size = 488;
 333                         video->cip_accum += video->cip_n;
 334                 }
 335
 336                 /* there are three important packets each frame:
 337
 338                    the first packet in the frame - we ask the card to record the timestamp when
 339                                                    this packet is actually sent, so we can monitor
 340                                                    how accurate our timestamps are. Also, the first
 341                                                    packet serves as a semaphore to let us know that
 342                                                    it's OK to free the *previous* frame's DMA buffer
 343
 344                    the last packet in the frame -  this packet is used to detect buffer underflows.
 345                                                    if this is the last ready frame, the last DMA block
 346                                                    will have a branch back to the beginning of the frame
 347                                                    (so that the card will re-send the frame on underflow).
 348                                                    if this branch gets taken, we know that at least one
 349                                                    frame has been dropped. When the next frame is ready,
 350                                                    the branch is pointed to its first packet, and the
 351                                                    semaphore is disabled.
 352
 353                    a "mid" packet slightly before the end of the frame - this packet should trigger
 354                                    an interrupt so we can go and assign a timestamp to the first packet
 355                                    in the next frame. We don't use the very last packet in the frame
 356                                    for this purpose, because that would leave very little time to set
 357                                    the timestamp before DMA starts on the next frame.
 358                 */
 359
 360                 if (f->n_packets == 0) {
 361                         first_packet = 1;
 362                 } else if ( full_packets == (packets_per_frame-1) ) {
 363                         last_packet = 1;
 364                 } else if (f->n_packets == packets_per_frame) {
 365                         mid_packet = 1;
 366                 }
 367
 368
 369                 /********************/
 370                 /* setup CIP header */
 371                 /********************/
 372
 373                 /* the timestamp will be written later from the
 374                    mid-frame interrupt handler. For now we just
 375                    store the address of the CIP header(s) that
 376                    need a timestamp. */
 377
 378                 /* first packet in the frame needs a timestamp */
 379                 if (first_packet) {
 380                         f->cip_syt1 = cip;
 381                         if (empty_packet)
 382                                 first_packet_empty = 1;
 383
 384                 } else if (first_packet_empty && (f->n_packets == 1) ) {
 385                         /* if the first packet was empty, the second
 386                            packet's CIP header also needs a timestamp */
 387                         f->cip_syt2 = cip;
 388                 }
 389
 390                 fill_cip_header(cip,
 391                                 /* the node ID number of the OHCI card */
 392                                 reg_read(video->ohci, OHCI1394_NodeID) & 0x3F,
 393                                 video->continuity_counter,
 394                                 video->pal_or_ntsc,
 395                                 0xFFFF /* the timestamp is filled in later */);
 396
 397                 /* advance counter, only for full packets */
 398                 if ( ! empty_packet )
 399                         video->continuity_counter++;
 400
 401                 /******************************/
 402                 /* setup DMA descriptor block */
 403                 /******************************/
 404
 405                 /* first descriptor - OUTPUT_MORE_IMMEDIATE, for the controller's IT header */
 406                 fill_output_more_immediate( &(block->u.out.omi), 1, video->channel, 0, payload_size);
 407
 408                 if (empty_packet) {
 409                         /* second descriptor - OUTPUT_LAST for CIP header */
 410                         fill_output_last( &(block->u.out.u.empty.ol),
 411
 412                                           /* want completion status on all interesting packets */
 413                                           (first_packet || mid_packet || last_packet) ? 1 : 0,
 414
 415                                           /* want interrupts on all interesting packets */
 416                                           (first_packet || mid_packet || last_packet) ? 1 : 0,
 417
 418                                           sizeof(struct CIP_header), /* data size */
 419                                           cip_dma);
 420
 421                         if (first_packet)
 422                                 f->frame_begin_timestamp = &(block->u.out.u.empty.ol.q[3]);
 423                         else if (mid_packet)
 424                                 f->mid_frame_timestamp = &(block->u.out.u.empty.ol.q[3]);
 425                         else if (last_packet) {
 426                                 f->frame_end_timestamp = &(block->u.out.u.empty.ol.q[3]);
 427                                 f->frame_end_branch = &(block->u.out.u.empty.ol.q[2]);
 428                         }
 429
 430                         branch_address = &(block->u.out.u.empty.ol.q[2]);
 431                         n_descriptors = 3;
 432                         if (first_packet)
 433                                 f->first_n_descriptors = n_descriptors;
 434
 435                 } else { /* full packet */
 436
 437                         /* second descriptor - OUTPUT_MORE for CIP header */
 438                         fill_output_more( &(block->u.out.u.full.om),
 439                                           sizeof(struct CIP_header), /* data size */
 440                                           cip_dma);
 441
 442
 443                         /* third (and possibly fourth) descriptor - for DV data */
 444                         /* the 480-byte payload can cross a page boundary; if so,
 445                            we need to split it into two DMA descriptors */
 446
 447                         /* does the 480-byte data payload cross a page boundary? */
 448                         if ( (PAGE_SIZE- ((unsigned long)data_p % PAGE_SIZE) ) < 480 ) {
 449
 450                                 /* page boundary crossed */
 451
 452                                 fill_output_more( &(block->u.out.u.full.u.cross.om),
 453                                                   /* data size - how much of data_p fits on the first page */
 454                                                   PAGE_SIZE - (data_p % PAGE_SIZE),
 455
 456                                                   /* DMA address of data_p */
 457                                                   dma_region_offset_to_bus(&video->dv_buf,
 458                                                                            data_p - (unsigned long) video->dv_buf.kvirt));
 459
 460                                 fill_output_last( &(block->u.out.u.full.u.cross.ol),
 461
 462                                                   /* want completion status on all interesting packets */
 463                                                   (first_packet || mid_packet || last_packet) ? 1 : 0,
 464
 465                                                   /* want interrupt on all interesting packets */
 466                                                   (first_packet || mid_packet || last_packet) ? 1 : 0,
 467
 468                                                   /* data size - remaining portion of data_p */
 469                                                   480 - (PAGE_SIZE - (data_p % PAGE_SIZE)),
 470
 471                                                   /* DMA address of data_p + PAGE_SIZE - (data_p % PAGE_SIZE) */
 472                                                   dma_region_offset_to_bus(&video->dv_buf,
 473                                                                            data_p + PAGE_SIZE - (data_p % PAGE_SIZE) - (unsigned long) video->dv_buf.kvirt));
 474
 475                                 if (first_packet)
 476                                         f->frame_begin_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
 477                                 else if (mid_packet)
 478                                         f->mid_frame_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
 479                                 else if (last_packet) {
 480                                         f->frame_end_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
 481                                         f->frame_end_branch = &(block->u.out.u.full.u.cross.ol.q[2]);
 482                                 }
 483
 484                                 branch_address = &(block->u.out.u.full.u.cross.ol.q[2]);
 485
 486                                 n_descriptors = 5;
 487                                 if (first_packet)
 488                                         f->first_n_descriptors = n_descriptors;
 489
 490                                 full_packets++;
 491
 492                         } else {
 493                                 /* fits on one page */
 494
 495                                 fill_output_last( &(block->u.out.u.full.u.nocross.ol),
 496
 497                                                   /* want completion status on all interesting packets */
 498                                                   (first_packet || mid_packet || last_packet) ? 1 : 0,
 499
 500                                                   /* want interrupt on all interesting packets */
 501                                                   (first_packet || mid_packet || last_packet) ? 1 : 0,
 502
 503                                                   480, /* data size (480 bytes of DV data) */
 504
 505
 506                                                   /* DMA address of data_p */
 507                                                   dma_region_offset_to_bus(&video->dv_buf,
 508                                                                            data_p - (unsigned long) video->dv_buf.kvirt));
 509
 510                                 if (first_packet)
 511                                         f->frame_begin_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
 512                                 else if (mid_packet)
 513                                         f->mid_frame_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
 514                                 else if (last_packet) {
 515                                         f->frame_end_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
 516                                         f->frame_end_branch = &(block->u.out.u.full.u.nocross.ol.q[2]);
 517                                 }
 518
 519                                 branch_address = &(block->u.out.u.full.u.nocross.ol.q[2]);
 520
 521                                 n_descriptors = 4;
 522                                 if (first_packet)
 523                                         f->first_n_descriptors = n_descriptors;
 524
 525                                 full_packets++;
 526                         }
 527                 }
 528
 529                 /* link this descriptor block into the DMA program by filling in
 530                    the branch address of the previous block */
 531
 532                 /* note: we are not linked into the active DMA chain yet */
 533
 534                 if (last_branch_address) {
 535                         *(last_branch_address) = cpu_to_le32(block_dma | n_descriptors);
 536                 }
 537
 538                 last_branch_address = branch_address;
 539
 540
 541                 f->n_packets++;
 542
 543         }
 544
 545         /* when we first assemble a new frame, set the final branch
 546            to loop back up to the top */
 547         *(f->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors);
 548
 549         /* make the latest version of this frame visible to the PCI card */
 550         dma_region_sync_for_device(&video->dv_buf, f->data - (unsigned long) video->dv_buf.kvirt, video->frame_size);
 551
 552         /* lock against DMA interrupt */
 553         spin_lock_irqsave(&video->spinlock, irq_flags);
 554
 555         f->state = FRAME_READY;
 556
 557         video->n_clear_frames--;
 558
 559         last_frame = video->first_clear_frame - 1;
 560         if (last_frame == -1)
 561                 last_frame = video->n_frames-1;
 562
 563         video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
 564
 565         irq_printk("   frame %d prepared, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n last=%d\n",
 566                    this_frame, video->active_frame, video->n_clear_frames, video->first_clear_frame, last_frame);
 567
 568         irq_printk("   begin_ts %08lx mid_ts %08lx end_ts %08lx end_br %08lx\n",
 569                    (unsigned long) f->frame_begin_timestamp,
 570                    (unsigned long) f->mid_frame_timestamp,
 571                    (unsigned long) f->frame_end_timestamp,
 572                    (unsigned long) f->frame_end_branch);
 573
 574         if (video->active_frame != -1) {
 575
 576                 /* if DMA is already active, we are almost done */
 577                 /* just link us onto the active DMA chain */
 578                 if (video->frames[last_frame]->frame_end_branch) {
 579                         u32 temp;
 580
 581                         /* point the previous frame's tail to this frame's head */
 582                         *(video->frames[last_frame]->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors);
 583
 584                         /* this write MUST precede the next one, or we could silently drop frames */
 585                         wmb();
 586
 587                         /* disable the want_status semaphore on the last packet */
 588                         temp = le32_to_cpu(*(video->frames[last_frame]->frame_end_branch - 2));
 589                         temp &= 0xF7CFFFFF;
 590                         *(video->frames[last_frame]->frame_end_branch - 2) = cpu_to_le32(temp);
 591
 592                         /* flush these writes to memory ASAP */
 593                         flush_pci_write(video->ohci);
 594
 595                         /* NOTE:
 596                            ideally the writes should be "atomic": if
 597                            the OHCI card reads the want_status flag in
 598                            between them, we'll falsely report a
 599                            dropped frame. Hopefully this window is too
 600                            small to really matter, and the consequence
 601                            is rather harmless. */
 602
 603
 604                         irq_printk("     new frame %d linked onto DMA chain\n", this_frame);
 605
 606                 } else {
 607                         printk(KERN_ERR "dv1394: last frame not ready???\n");
 608                 }
 609
 610         } else {
 611
 612                 u32 transmit_sec, transmit_cyc;
 613                 u32 ts_cyc, ts_off;
 614
 615                 /* DMA is stopped, so this is the very first frame */
 616                 video->active_frame = this_frame;
 617
 618                 /* set CommandPtr to address and size of first descriptor block */
 619                 reg_write(video->ohci, video->ohci_IsoXmitCommandPtr,
 620                           video->frames[video->active_frame]->descriptor_pool_dma |
 621                           f->first_n_descriptors);
 622
 623                 /* assign a timestamp based on the current cycle time...
 624                    We'll tell the card to begin DMA 100 cycles from now,
 625                    and assign a timestamp 103 cycles from now */
 626
 627                 cycleTimer = reg_read(video->ohci, OHCI1394_IsochronousCycleTimer);
 628
 629                 ct_sec = cycleTimer >> 25;
 630                 ct_cyc = (cycleTimer >> 12) & 0x1FFF;
 631                 ct_off = cycleTimer & 0xFFF;
 632
 633                 transmit_sec = ct_sec;
 634                 transmit_cyc = ct_cyc + 100;
 635
 636                 transmit_sec += transmit_cyc/8000;
 637                 transmit_cyc %= 8000;
 638
 639                 ts_off = ct_off;
 640                 ts_cyc = transmit_cyc + 3;
 641                 ts_cyc %= 8000;
 642
 643                 f->assigned_timestamp = (ts_cyc&0xF) << 12;
 644
 645                 /* now actually write the timestamp into the appropriate CIP headers */
 646                 if (f->cip_syt1) {
 647                         f->cip_syt1->b[6] = f->assigned_timestamp >> 8;
 648                         f->cip_syt1->b[7] = f->assigned_timestamp & 0xFF;
 649                 }
 650                 if (f->cip_syt2) {
 651                         f->cip_syt2->b[6] = f->assigned_timestamp >> 8;
 652                         f->cip_syt2->b[7] = f->assigned_timestamp & 0xFF;
 653                 }
 654
 655                 /* --- start DMA --- */
 656
 657                 /* clear all bits in ContextControl register */
 658
 659                 reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, 0xFFFFFFFF);
 660                 wmb();
 661
 662                 /* the OHCI card has the ability to start ISO transmission on a
 663                    particular cycle (start-on-cycle). This way we can ensure that
 664                    the first DV frame will have an accurate timestamp.
 665
 666                    However, start-on-cycle only appears to work if the OHCI card
 667                    is cycle master! Since the consequences of messing up the first
 668                    timestamp are minimal*, just disable start-on-cycle for now.
 669
 670                    * my DV deck drops the first few frames before it "locks in;"
 671                      so the first frame having an incorrect timestamp is inconsequential.
 672                 */
 673
 674 #if 0
 675                 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet,
 676                           (1 << 31) /* enable start-on-cycle */
 677                           | ( (transmit_sec & 0x3) << 29)
 678                           | (transmit_cyc << 16));
 679                 wmb();
 680 #endif
 681
 682                 video->dma_running = 1;
 683
 684                 /* set the 'run' bit */
 685                 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, 0x8000);
 686                 flush_pci_write(video->ohci);
 687
 688                 /* --- DMA should be running now --- */
 689
 690                 debug_printk("    Cycle = %4u ContextControl = %08x CmdPtr = %08x\n",
 691                              (reg_read(video->ohci, OHCI1394_IsochronousCycleTimer) >> 12) & 0x1FFF,
 692                              reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
 693                              reg_read(video->ohci, video->ohci_IsoXmitCommandPtr));
 694
 695                 debug_printk("    DMA start - current cycle %4u, transmit cycle %4u (%2u), assigning ts cycle %2u\n",
 696                              ct_cyc, transmit_cyc, transmit_cyc & 0xF, ts_cyc & 0xF);
 697
 698 #if DV1394_DEBUG_LEVEL >= 2
 699                 {
 700                         /* check if DMA is really running */
 701                         int i = 0;
 702                         while (i < 20) {
 703                                 mb();
 704                                 mdelay(1);
 705                                 if (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) {
 706                                         printk("DMA ACTIVE after %d msec\n", i);
 707                                         break;
 708                                 }
 709                                 i++;
 710                         }
 711
 712                         printk("set = %08x, cmdPtr = %08x\n",
 713                                reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
 714                                reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)
 715                                );
 716
 717                         if ( ! (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) &  (1 << 10)) ) {
 718                                 printk("DMA did NOT go active after 20ms, event = %x\n",
 719                                        reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & 0x1F);
 720                         } else
 721                                 printk("DMA is RUNNING!\n");
 722                 }
 723 #endif
 724
 725         }
 726
 727
 728         spin_unlock_irqrestore(&video->spinlock, irq_flags);
 729 }
 730
 731
 732
 733 /*** RECEIVE FUNCTIONS *****************************************************/
 734
 735 /*
 736         frame method put_packet
 737
 738         map and copy the packet data to its location in the frame
 739         based upon DIF section and sequence
 740 */
 741
 742 static void inline
 743 frame_put_packet (struct frame *f, struct packet *p)
 744 {
 745         int section_type = p->data[0] >> 5;           /* section type is in bits 5 - 7 */
 746         int dif_sequence = p->data[1] >> 4;           /* dif sequence number is in bits 4 - 7 */
 747         int dif_block = p->data[2];
 748
 749         /* sanity check */
 750         if (dif_sequence > 11 || dif_block > 149) return;
 751
 752         switch (section_type) {
 753         case 0:           /* 1 Header block */
 754                 memcpy( (void *) f->data + dif_sequence * 150 * 80, p->data, 480);
 755                 break;
 756
 757         case 1:           /* 2 Subcode blocks */
 758                 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (1 + dif_block) * 80, p->data, 480);
 759                 break;
 760
 761         case 2:           /* 3 VAUX blocks */
 762                 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (3 + dif_block) * 80, p->data, 480);
 763                 break;
 764
 765         case 3:           /* 9 Audio blocks interleaved with video */
 766                 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (6 + dif_block * 16) * 80, p->data, 480);
 767                 break;
 768
 769         case 4:           /* 135 Video blocks interleaved with audio */
 770                 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (7 + (dif_block / 15) + dif_block) * 80, p->data, 480);
 771                 break;
 772
 773         default:           /* we can not handle any other data */
 774                 break;
 775         }
 776 }
 777
 778
 779 static void start_dma_receive(struct video_card *video)
 780 {
 781         if (video->first_run == 1) {
 782                 video->first_run = 0;
 783
 784                 /* start DMA once all of the frames are READY */
 785                 video->n_clear_frames = 0;
 786                 video->first_clear_frame = -1;
 787                 video->current_packet = 0;
 788                 video->active_frame = 0;
 789
 790                 /* reset iso recv control register */
 791                 reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, 0xFFFFFFFF);
 792                 wmb();
 793
 794                 /* clear bufferFill, set isochHeader and speed (0=100) */
 795                 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x40000000);
 796
 797                 /* match on all tags, listen on channel */
 798                 reg_write(video->ohci, video->ohci_IsoRcvContextMatch, 0xf0000000 | video->channel);
 799
 800                 /* address and first descriptor block + Z=1 */
 801                 reg_write(video->ohci, video->ohci_IsoRcvCommandPtr,
 802                           video->frames[0]->descriptor_pool_dma | 1); /* Z=1 */
 803                 wmb();
 804
 805                 video->dma_running = 1;
 806
 807                 /* run */
 808                 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x8000);
 809                 flush_pci_write(video->ohci);
 810
 811                 debug_printk("dv1394: DMA started\n");
 812
 813 #if DV1394_DEBUG_LEVEL >= 2
 814                 {
 815                         int i;
 816
 817                         for (i = 0; i < 1000; ++i) {
 818                                 mdelay(1);
 819                                 if (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) {
 820                                         printk("DMA ACTIVE after %d msec\n", i);
 821                                         break;
 822                                 }
 823                         }
 824                         if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) &  (1 << 11) ) {
 825                                 printk("DEAD, event = %x\n",
 826                                            reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F);
 827                         } else
 828                                 printk("RUNNING!\n");
 829                 }
 830 #endif
 831         } else if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) &  (1 << 11) ) {
 832                 debug_printk("DEAD, event = %x\n",
 833                              reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F);
 834
 835                 /* wake */
 836                 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
 837         }
 838 }
 839
 840
 841 /*
 842    receive_packets() - build the DMA program for receiving
 843 */
 844
 845 static void receive_packets(struct video_card *video)
 846 {
 847         struct DMA_descriptor_block *block = NULL;
 848         dma_addr_t block_dma = 0;
 849         struct packet *data = NULL;
 850         dma_addr_t data_dma = 0;
 851         __le32 *last_branch_address = NULL;
 852         unsigned long irq_flags;
 853         int want_interrupt = 0;
 854         struct frame *f = NULL;
 855         int i, j;
 856
 857         spin_lock_irqsave(&video->spinlock, irq_flags);
 858
 859         for (j = 0; j < video->n_frames; j++) {
 860
 861                 /* connect frames */
 862                 if (j > 0 && f != NULL && f->frame_end_branch != NULL)
 863                         *(f->frame_end_branch) = cpu_to_le32(video->frames[j]->descriptor_pool_dma | 1); /* set Z=1 */
 864
 865                 f = video->frames[j];
 866
 867                 for (i = 0; i < MAX_PACKETS; i++) {
 868                         /* locate a descriptor block and packet from the buffer */
 869                         block = &(f->descriptor_pool[i]);
 870                         block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
 871
 872                         data = ((struct packet*)video->packet_buf.kvirt) + f->frame_num * MAX_PACKETS + i;
 873                         data_dma = dma_region_offset_to_bus( &video->packet_buf,
 874                                                              ((unsigned long) data - (unsigned long) video->packet_buf.kvirt) );
 875
 876                         /* setup DMA descriptor block */
 877                         want_interrupt = ((i % (MAX_PACKETS/2)) == 0 || i == (MAX_PACKETS-1));
 878                         fill_input_last( &(block->u.in.il), want_interrupt, 512, data_dma);
 879
 880                         /* link descriptors */
 881                         last_branch_address = f->frame_end_branch;
 882
 883                         if (last_branch_address != NULL)
 884                                 *(last_branch_address) = cpu_to_le32(block_dma | 1); /* set Z=1 */
 885
 886                         f->frame_end_branch = &(block->u.in.il.q[2]);
 887                 }
 888
 889         } /* next j */
 890
 891         spin_unlock_irqrestore(&video->spinlock, irq_flags);
 892
 893 }
 894
 895
 896
 897 /*** MANAGEMENT FUNCTIONS **************************************************/
 898
 899 static int do_dv1394_init(struct video_card *video, struct dv1394_init *init)
 900 {
 901         unsigned long flags, new_buf_size;
 902         int i;
 903         u64 chan_mask;
 904         int retval = -EINVAL;
 905
 906         debug_printk("dv1394: initialising %d\n", video->id);
 907         if (init->api_version != DV1394_API_VERSION)
 908                 return -EINVAL;
 909
 910         /* first sanitize all the parameters */
 911         if ( (init->n_frames < 2) || (init->n_frames > DV1394_MAX_FRAMES) )
 912                 return -EINVAL;
 913
 914         if ( (init->format != DV1394_NTSC) && (init->format != DV1394_PAL) )
 915                 return -EINVAL;
 916
 917         if ( (init->syt_offset == 0) || (init->syt_offset > 50) )
 918                 /* default SYT offset is 3 cycles */
 919                 init->syt_offset = 3;
 920
 921         if (init->channel > 63)
 922                 init->channel = 63;
 923
 924         chan_mask = (u64)1 << init->channel;
 925
 926         /* calculate what size DMA buffer is needed */
 927         if (init->format == DV1394_NTSC)
 928                 new_buf_size = DV1394_NTSC_FRAME_SIZE * init->n_frames;
 929         else
 930                 new_buf_size = DV1394_PAL_FRAME_SIZE * init->n_frames;
 931
 932         /* round up to PAGE_SIZE */
 933         if (new_buf_size % PAGE_SIZE) new_buf_size += PAGE_SIZE - (new_buf_size % PAGE_SIZE);
 934
 935         /* don't allow the user to allocate the DMA buffer more than once */
 936         if (video->dv_buf.kvirt && video->dv_buf_size != new_buf_size) {
 937                 printk("dv1394: re-sizing the DMA buffer is not allowed\n");
 938                 return -EINVAL;
 939         }
 940
 941         /* shutdown the card if it's currently active */
 942         /* (the card should not be reset if the parameters are screwy) */
 943
 944         do_dv1394_shutdown(video, 0);
 945
 946         /* try to claim the ISO channel */
 947         spin_lock_irqsave(&video->ohci->IR_channel_lock, flags);
 948         if (video->ohci->ISO_channel_usage & chan_mask) {
 949                 spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
 950                 retval = -EBUSY;
 951                 goto err;
 952         }
 953         video->ohci->ISO_channel_usage |= chan_mask;
 954         spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
 955
 956         video->channel = init->channel;
 957
 958         /* initialize misc. fields of video */
 959         video->n_frames = init->n_frames;
 960         video->pal_or_ntsc = init->format;
 961
 962         video->cip_accum = 0;
 963         video->continuity_counter = 0;
 964
 965         video->active_frame = -1;
 966         video->first_clear_frame = 0;
 967         video->n_clear_frames = video->n_frames;
 968         video->dropped_frames = 0;
 969
 970         video->write_off = 0;
 971
 972         video->first_run = 1;
 973         video->current_packet = -1;
 974         video->first_frame = 0;
 975
 976         if (video->pal_or_ntsc == DV1394_NTSC) {
 977                 video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_NTSC;
 978                 video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_NTSC;
 979                 video->frame_size = DV1394_NTSC_FRAME_SIZE;
 980         } else {
 981                 video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_PAL;
 982                 video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_PAL;
 983                 video->frame_size = DV1394_PAL_FRAME_SIZE;
 984         }
 985
 986         video->syt_offset = init->syt_offset;
 987
 988         /* find and claim DMA contexts on the OHCI card */
 989
 990         if (video->ohci_it_ctx == -1) {
 991                 ohci1394_init_iso_tasklet(&video->it_tasklet, OHCI_ISO_TRANSMIT,
 992                                           it_tasklet_func, (unsigned long) video);
 993
 994                 if (ohci1394_register_iso_tasklet(video->ohci, &video->it_tasklet) < 0) {
 995                         printk(KERN_ERR "dv1394: could not find an available IT DMA context\n");
 996                         retval = -EBUSY;
 997                         goto err;
 998                 }
 999
1000                 video->ohci_it_ctx = video->it_tasklet.context;
1001                 debug_printk("dv1394: claimed IT DMA context %d\n", video->ohci_it_ctx);
1002         }
1003
1004         if (video->ohci_ir_ctx == -1) {
1005                 ohci1394_init_iso_tasklet(&video->ir_tasklet, OHCI_ISO_RECEIVE,
1006                                           ir_tasklet_func, (unsigned long) video);
1007
1008                 if (ohci1394_register_iso_tasklet(video->ohci, &video->ir_tasklet) < 0) {
1009                         printk(KERN_ERR "dv1394: could not find an available IR DMA context\n");
1010                         retval = -EBUSY;
1011                         goto err;
1012                 }
1013                 video->ohci_ir_ctx = video->ir_tasklet.context;
1014                 debug_printk("dv1394: claimed IR DMA context %d\n", video->ohci_ir_ctx);
1015         }
1016
1017         /* allocate struct frames */
1018         for (i = 0; i < init->n_frames; i++) {
1019                 video->frames[i] = frame_new(i, video);
1020
1021                 if (!video->frames[i]) {
1022                         printk(KERN_ERR "dv1394: Cannot allocate frame structs\n");
1023                         retval = -ENOMEM;
1024                         goto err;
1025                 }
1026         }
1027
1028         if (!video->dv_buf.kvirt) {
1029                 /* allocate the ringbuffer */
1030                 retval = dma_region_alloc(&video->dv_buf, new_buf_size, video->ohci->dev, PCI_DMA_TODEVICE);
1031                 if (retval)
1032                         goto err;
1033
1034                 video->dv_buf_size = new_buf_size;
1035
1036                 debug_printk("dv1394: Allocated %d frame buffers, total %u pages (%u DMA pages), %lu bytes\n",
1037                              video->n_frames, video->dv_buf.n_pages,
1038                              video->dv_buf.n_dma_pages, video->dv_buf_size);
1039         }
1040
1041         /* set up the frame->data pointers */
1042         for (i = 0; i < video->n_frames; i++)
1043                 video->frames[i]->data = (unsigned long) video->dv_buf.kvirt + i * video->frame_size;
1044
1045         if (!video->packet_buf.kvirt) {
1046                 /* allocate packet buffer */
1047                 video->packet_buf_size = sizeof(struct packet) * video->n_frames * MAX_PACKETS;
1048                 if (video->packet_buf_size % PAGE_SIZE)
1049                         video->packet_buf_size += PAGE_SIZE - (video->packet_buf_size % PAGE_SIZE);
1050
1051                 retval = dma_region_alloc(&video->packet_buf, video->packet_buf_size,
1052                                           video->ohci->dev, PCI_DMA_FROMDEVICE);
1053                 if (retval)
1054                         goto err;
1055
1056                 debug_printk("dv1394: Allocated %d packets in buffer, total %u pages (%u DMA pages), %lu bytes\n",
1057                                  video->n_frames*MAX_PACKETS, video->packet_buf.n_pages,
1058                                  video->packet_buf.n_dma_pages, video->packet_buf_size);
1059         }
1060
1061         /* set up register offsets for IT context */
1062         /* IT DMA context registers are spaced 16 bytes apart */
1063         video->ohci_IsoXmitContextControlSet = OHCI1394_IsoXmitContextControlSet+16*video->ohci_it_ctx;
1064         video->ohci_IsoXmitContextControlClear = OHCI1394_IsoXmitContextControlClear+16*video->ohci_it_ctx;
1065         video->ohci_IsoXmitCommandPtr = OHCI1394_IsoXmitCommandPtr+16*video->ohci_it_ctx;
1066
1067         /* enable interrupts for IT context */
1068         reg_write(video->ohci, OHCI1394_IsoXmitIntMaskSet, (1 << video->ohci_it_ctx));
1069         debug_printk("dv1394: interrupts enabled for IT context %d\n", video->ohci_it_ctx);
1070
1071         /* set up register offsets for IR context */
1072         /* IR DMA context registers are spaced 32 bytes apart */
1073         video->ohci_IsoRcvContextControlSet = OHCI1394_IsoRcvContextControlSet+32*video->ohci_ir_ctx;
1074         video->ohci_IsoRcvContextControlClear = OHCI1394_IsoRcvContextControlClear+32*video->ohci_ir_ctx;
1075         video->ohci_IsoRcvCommandPtr = OHCI1394_IsoRcvCommandPtr+32*video->ohci_ir_ctx;
1076         video->ohci_IsoRcvContextMatch = OHCI1394_IsoRcvContextMatch+32*video->ohci_ir_ctx;
1077
1078         /* enable interrupts for IR context */
1079         reg_write(video->ohci, OHCI1394_IsoRecvIntMaskSet, (1 << video->ohci_ir_ctx) );
1080         debug_printk("dv1394: interrupts enabled for IR context %d\n", video->ohci_ir_ctx);
1081
1082         return 0;
1083
1084 err:
1085         do_dv1394_shutdown(video, 1);
1086         return retval;
1087 }
1088
1089 /* if the user doesn't bother to call ioctl(INIT) before starting
1090    mmap() or read()/write(), just give him some default values */
1091
1092 static int do_dv1394_init_default(struct video_card *video)
1093 {
1094         struct dv1394_init init;
1095
1096         init.api_version = DV1394_API_VERSION;
1097         init.n_frames = DV1394_MAX_FRAMES / 4;
1098         init.channel = video->channel;
1099         init.format = video->pal_or_ntsc;
1100         init.cip_n = video->cip_n;
1101         init.cip_d = video->cip_d;
1102         init.syt_offset = video->syt_offset;
1103
1104         return do_dv1394_init(video, &init);
1105 }
1106
1107 /* do NOT call from interrupt context */
1108 static void stop_dma(struct video_card *video)
1109 {
1110         unsigned long flags;
1111         int i;
1112
1113         /* no interrupts */
1114         spin_lock_irqsave(&video->spinlock, flags);
1115
1116         video->dma_running = 0;
1117
1118         if ( (video->ohci_it_ctx == -1) && (video->ohci_ir_ctx == -1) )
1119                 goto out;
1120
1121         /* stop DMA if in progress */
1122         if ( (video->active_frame != -1) ||
1123             (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) ||
1124             (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear) &  (1 << 10)) ) {
1125
1126                 /* clear the .run bits */
1127                 reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15));
1128                 reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15));
1129                 flush_pci_write(video->ohci);
1130
1131                 video->active_frame = -1;
1132                 video->first_run = 1;
1133
1134                 /* wait until DMA really stops */
1135                 i = 0;
1136                 while (i < 1000) {
1137
1138                         /* wait 0.1 millisecond */
1139                         udelay(100);
1140
1141                         if ( (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) ||
1142                             (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear)  & (1 << 10)) ) {
1143                                 /* still active */
1144                                 debug_printk("dv1394: stop_dma: DMA not stopped yet\n" );
1145                                 mb();
1146                         } else {
1147                                 debug_printk("dv1394: stop_dma: DMA stopped safely after %d ms\n", i/10);
1148                                 break;
1149                         }
1150
1151                         i++;
1152                 }
1153
1154                 if (i == 1000) {
1155                         printk(KERN_ERR "dv1394: stop_dma: DMA still going after %d ms!\n", i/10);
1156                 }
1157         }
1158         else
1159                 debug_printk("dv1394: stop_dma: already stopped.\n");
1160
1161 out:
1162         spin_unlock_irqrestore(&video->spinlock, flags);
1163 }
1164
1165
1166
1167 static void do_dv1394_shutdown(struct video_card *video, int free_dv_buf)
1168 {
1169         int i;
1170
1171         debug_printk("dv1394: shutdown...\n");
1172
1173         /* stop DMA if in progress */
1174         stop_dma(video);
1175
1176         /* release the DMA contexts */
1177         if (video->ohci_it_ctx != -1) {
1178                 video->ohci_IsoXmitContextControlSet = 0;
1179                 video->ohci_IsoXmitContextControlClear = 0;
1180                 video->ohci_IsoXmitCommandPtr = 0;
1181
1182                 /* disable interrupts for IT context */
1183                 reg_write(video->ohci, OHCI1394_IsoXmitIntMaskClear, (1 << video->ohci_it_ctx));
1184
1185                 /* remove tasklet */
1186                 ohci1394_unregister_iso_tasklet(video->ohci, &video->it_tasklet);
1187                 debug_printk("dv1394: IT context %d released\n", video->ohci_it_ctx);
1188                 video->ohci_it_ctx = -1;
1189         }
1190
1191         if (video->ohci_ir_ctx != -1) {
1192                 video->ohci_IsoRcvContextControlSet = 0;
1193                 video->ohci_IsoRcvContextControlClear = 0;
1194                 video->ohci_IsoRcvCommandPtr = 0;
1195                 video->ohci_IsoRcvContextMatch = 0;
1196
1197                 /* disable interrupts for IR context */
1198                 reg_write(video->ohci, OHCI1394_IsoRecvIntMaskClear, (1 << video->ohci_ir_ctx));
1199
1200                 /* remove tasklet */
1201                 ohci1394_unregister_iso_tasklet(video->ohci, &video->ir_tasklet);
1202                 debug_printk("dv1394: IR context %d released\n", video->ohci_ir_ctx);
1203                 video->ohci_ir_ctx = -1;
1204         }
1205
1206         /* release the ISO channel */
1207         if (video->channel != -1) {
1208                 u64 chan_mask;
1209                 unsigned long flags;
1210
1211                 chan_mask = (u64)1 << video->channel;
1212
1213                 spin_lock_irqsave(&video->ohci->IR_channel_lock, flags);
1214                 video->ohci->ISO_channel_usage &= ~(chan_mask);
1215                 spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
1216
1217                 video->channel = -1;
1218         }
1219
1220         /* free the frame structs */
1221         for (i = 0; i < DV1394_MAX_FRAMES; i++) {
1222                 if (video->frames[i])
1223                         frame_delete(video->frames[i]);
1224                 video->frames[i] = NULL;
1225         }
1226
1227         video->n_frames = 0;
1228
1229         /* we can't free the DMA buffer unless it is guaranteed that
1230            no more user-space mappings exist */
1231
1232         if (free_dv_buf) {
1233                 dma_region_free(&video->dv_buf);
1234                 video->dv_buf_size = 0;
1235         }
1236
1237         /* free packet buffer */
1238         dma_region_free(&video->packet_buf);
1239         video->packet_buf_size = 0;
1240
1241         debug_printk("dv1394: shutdown OK\n");
1242 }
1243
1244 /*
1245        **********************************
1246        *** MMAP() THEORY OF OPERATION ***
1247        **********************************
1248
1249         The ringbuffer cannot be re-allocated or freed while
1250         a user program maintains a mapping of it. (note that a mapping
1251         can persist even after the device fd is closed!)
1252
1253         So, only let the user process allocate the DMA buffer once.
1254         To resize or deallocate it, you must close the device file
1255         and open it again.
1256
1257         Previously Dan M. hacked out a scheme that allowed the DMA
1258         buffer to change by forcefully unmapping it from the user's
1259         address space. It was prone to error because it's very hard to
1260         track all the places the buffer could have been mapped (we
1261         would have had to walk the vma list of every process in the
1262         system to be sure we found all the mappings!). Instead, we
1263         force the user to choose one buffer size and stick with
1264         it. This small sacrifice is worth the huge reduction in
1265         error-prone code in dv1394.
1266 */
1267
1268 static int dv1394_mmap(struct file *file, struct vm_area_struct *vma)
1269 {
1270         struct video_card *video = file_to_video_card(file);
1271         int retval = -EINVAL;
1272
1273         /*
1274          * We cannot use the blocking variant mutex_lock here because .mmap
1275          * is called with mmap_sem held, while .ioctl, .read, .write acquire
1276          * video->mtx and subsequently call copy_to/from_user which will
1277          * grab mmap_sem in case of a page fault.
1278          */
1279         if (!mutex_trylock(&video->mtx))
1280                 return -EAGAIN;
1281
1282         if ( ! video_card_initialized(video) ) {
1283                 retval = do_dv1394_init_default(video);
1284                 if (retval)
1285                         goto out;
1286         }
1287
1288         retval = dma_region_mmap(&video->dv_buf, file, vma);
1289 out:
1290         mutex_unlock(&video->mtx);
1291         return retval;
1292 }
1293
1294 /*** DEVICE FILE INTERFACE *************************************************/
1295
1296 /* no need to serialize, multiple threads OK */
1297 static unsigned int dv1394_poll(struct file *file, struct poll_table_struct *wait)
1298 {
1299         struct video_card *video = file_to_video_card(file);
1300         unsigned int mask = 0;
1301         unsigned long flags;
1302
1303         poll_wait(file, &video->waitq, wait);
1304
1305         spin_lock_irqsave(&video->spinlock, flags);
1306         if ( video->n_frames == 0 ) {
1307
1308         } else if ( video->active_frame == -1 ) {
1309                 /* nothing going on */
1310                 mask |= POLLOUT;
1311         } else {
1312                 /* any clear/ready buffers? */
1313                 if (video->n_clear_frames >0)
1314                         mask |= POLLOUT | POLLIN;
1315         }
1316         spin_unlock_irqrestore(&video->spinlock, flags);
1317
1318         return mask;
1319 }
1320
1321 static int dv1394_fasync(int fd, struct file *file, int on)
1322 {
1323         /* I just copied this code verbatim from Alan Cox's mouse driver example
1324            (Documentation/DocBook/) */
1325
1326         struct video_card *video = file_to_video_card(file);
1327
1328         return fasync_helper(fd, file, on, &video->fasync);
1329 }
1330
1331 static ssize_t dv1394_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
1332 {
1333         struct video_card *video = file_to_video_card(file);
1334         DECLARE_WAITQUEUE(wait, current);
1335         ssize_t ret;
1336         size_t cnt;
1337         unsigned long flags;
1338         int target_frame;
1339
1340         /* serialize this to prevent multi-threaded mayhem */
1341         if (file->f_flags & O_NONBLOCK) {
1342                 if (!mutex_trylock(&video->mtx))
1343                         return -EAGAIN;
1344         } else {
1345                 if (mutex_lock_interruptible(&video->mtx))
1346                         return -ERESTARTSYS;
1347         }
1348
1349         if ( !video_card_initialized(video) ) {
1350                 ret = do_dv1394_init_default(video);
1351                 if (ret) {
1352                         mutex_unlock(&video->mtx);
1353                         return ret;
1354                 }
1355         }
1356
1357         ret = 0;
1358         add_wait_queue(&video->waitq, &wait);
1359
1360         while (count > 0) {
1361
1362                 /* must set TASK_INTERRUPTIBLE *before* checking for free
1363                    buffers; otherwise we could miss a wakeup if the interrupt
1364                    fires between the check and the schedule() */
1365
1366                 set_current_state(TASK_INTERRUPTIBLE);
1367
1368                 spin_lock_irqsave(&video->spinlock, flags);
1369
1370                 target_frame = video->first_clear_frame;
1371
1372                 spin_unlock_irqrestore(&video->spinlock, flags);
1373
1374                 if (video->frames[target_frame]->state == FRAME_CLEAR) {
1375
1376                         /* how much room is left in the target frame buffer */
1377                         cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
1378
1379                 } else {
1380                         /* buffer is already used */
1381                         cnt = 0;
1382                 }
1383
1384                 if (cnt > count)
1385                         cnt = count;
1386
1387                 if (cnt <= 0) {
1388                         /* no room left, gotta wait */
1389                         if (file->f_flags & O_NONBLOCK) {
1390                                 if (!ret)
1391                                         ret = -EAGAIN;
1392                                 break;
1393                         }
1394                         if (signal_pending(current)) {
1395                                 if (!ret)
1396                                         ret = -ERESTARTSYS;
1397                                 break;
1398                         }
1399
1400                         schedule();
1401
1402                         continue; /* start over from 'while(count > 0)...' */
1403                 }
1404
1405                 if (copy_from_user(video->dv_buf.kvirt + video->write_off, buffer, cnt)) {
1406                         if (!ret)
1407                                 ret = -EFAULT;
1408                         break;
1409                 }
1410
1411                 video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
1412
1413                 count -= cnt;
1414                 buffer += cnt;
1415                 ret += cnt;
1416
1417                 if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames))
1418                                 frame_prepare(video, target_frame);
1419         }
1420
1421         remove_wait_queue(&video->waitq, &wait);
1422         set_current_state(TASK_RUNNING);
1423         mutex_unlock(&video->mtx);
1424         return ret;
1425 }
1426
1427
1428 static ssize_t dv1394_read(struct file *file,  char __user *buffer, size_t count, loff_t *ppos)
1429 {
1430         struct video_card *video = file_to_video_card(file);
1431         DECLARE_WAITQUEUE(wait, current);
1432         ssize_t ret;
1433         size_t cnt;
1434         unsigned long flags;
1435         int target_frame;
1436
1437         /* serialize this to prevent multi-threaded mayhem */
1438         if (file->f_flags & O_NONBLOCK) {
1439                 if (!mutex_trylock(&video->mtx))
1440                         return -EAGAIN;
1441         } else {
1442                 if (mutex_lock_interruptible(&video->mtx))
1443                         return -ERESTARTSYS;
1444         }
1445
1446         if ( !video_card_initialized(video) ) {
1447                 ret = do_dv1394_init_default(video);
1448                 if (ret) {
1449                         mutex_unlock(&video->mtx);
1450                         return ret;
1451                 }
1452                 video->continuity_counter = -1;
1453
1454                 receive_packets(video);
1455
1456                 start_dma_receive(video);
1457         }
1458
1459         ret = 0;
1460         add_wait_queue(&video->waitq, &wait);
1461
1462         while (count > 0) {
1463
1464                 /* must set TASK_INTERRUPTIBLE *before* checking for free
1465                    buffers; otherwise we could miss a wakeup if the interrupt
1466                    fires between the check and the schedule() */
1467
1468                 set_current_state(TASK_INTERRUPTIBLE);
1469
1470                 spin_lock_irqsave(&video->spinlock, flags);
1471
1472                 target_frame = video->first_clear_frame;
1473
1474                 spin_unlock_irqrestore(&video->spinlock, flags);
1475
1476                 if (target_frame >= 0 &&
1477                         video->n_clear_frames > 0 &&
1478                         video->frames[target_frame]->state == FRAME_CLEAR) {
1479
1480                         /* how much room is left in the target frame buffer */
1481                         cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
1482
1483                 } else {
1484                         /* buffer is already used */
1485                         cnt = 0;
1486                 }
1487
1488                 if (cnt > count)
1489                         cnt = count;
1490
1491                 if (cnt <= 0) {
1492                         /* no room left, gotta wait */
1493                         if (file->f_flags & O_NONBLOCK) {
1494                                 if (!ret)
1495                                         ret = -EAGAIN;
1496                                 break;
1497                         }
1498                         if (signal_pending(current)) {
1499                                 if (!ret)
1500                                         ret = -ERESTARTSYS;
1501                                 break;
1502                         }
1503
1504                         schedule();
1505
1506                         continue; /* start over from 'while(count > 0)...' */
1507                 }
1508
1509                 if (copy_to_user(buffer, video->dv_buf.kvirt + video->write_off, cnt)) {
1510                                 if (!ret)
1511                                         ret = -EFAULT;
1512                                 break;
1513                 }
1514
1515                 video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
1516
1517                 count -= cnt;
1518                 buffer += cnt;
1519                 ret += cnt;
1520
1521                 if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames)) {
1522                         spin_lock_irqsave(&video->spinlock, flags);
1523                         video->n_clear_frames--;
1524                         video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
1525                         spin_unlock_irqrestore(&video->spinlock, flags);
1526                 }
1527         }
1528
1529         remove_wait_queue(&video->waitq, &wait);
1530         set_current_state(TASK_RUNNING);
1531         mutex_unlock(&video->mtx);
1532         return ret;
1533 }
1534
1535
1536 /*** DEVICE IOCTL INTERFACE ************************************************/
1537
1538 static long dv1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1539 {
1540         struct video_card *video = file_to_video_card(file);
1541         unsigned long flags;
1542         int ret = -EINVAL;
1543         void __user *argp = (void __user *)arg;
1544
1545         DECLARE_WAITQUEUE(wait, current);
1546
1547         /* serialize this to prevent multi-threaded mayhem */
1548         if (file->f_flags & O_NONBLOCK) {
1549                 if (!mutex_trylock(&video->mtx))
1550                         return -EAGAIN;
1551         } else {
1552                 if (mutex_lock_interruptible(&video->mtx))
1553                         return -ERESTARTSYS;
1554         }
1555
1556         switch(cmd)
1557         {
1558         case DV1394_IOC_SUBMIT_FRAMES: {
1559                 unsigned int n_submit;
1560
1561                 if ( !video_card_initialized(video) ) {
1562                         ret = do_dv1394_init_default(video);
1563                         if (ret)
1564                                 goto out;
1565                 }
1566
1567                 n_submit = (unsigned int) arg;
1568
1569                 if (n_submit > video->n_frames) {
1570                         ret = -EINVAL;
1571                         goto out;
1572                 }
1573
1574                 while (n_submit > 0) {
1575
1576                         add_wait_queue(&video->waitq, &wait);
1577                         set_current_state(TASK_INTERRUPTIBLE);
1578
1579                         spin_lock_irqsave(&video->spinlock, flags);
1580
1581                         /* wait until video->first_clear_frame is really CLEAR */
1582                         while (video->frames[video->first_clear_frame]->state != FRAME_CLEAR) {
1583
1584                                 spin_unlock_irqrestore(&video->spinlock, flags);
1585
1586                                 if (signal_pending(current)) {
1587                                         remove_wait_queue(&video->waitq, &wait);
1588                                         set_current_state(TASK_RUNNING);
1589                                         ret = -EINTR;
1590                                         goto out;
1591                                 }
1592
1593                                 schedule();
1594                                 set_current_state(TASK_INTERRUPTIBLE);
1595
1596                                 spin_lock_irqsave(&video->spinlock, flags);
1597                         }
1598                         spin_unlock_irqrestore(&video->spinlock, flags);
1599
1600                         remove_wait_queue(&video->waitq, &wait);
1601                         set_current_state(TASK_RUNNING);
1602
1603                         frame_prepare(video, video->first_clear_frame);
1604
1605                         n_submit--;
1606                 }
1607
1608                 ret = 0;
1609                 break;
1610         }
1611
1612         case DV1394_IOC_WAIT_FRAMES: {
1613                 unsigned int n_wait;
1614
1615                 if ( !video_card_initialized(video) ) {
1616                         ret = -EINVAL;
1617                         goto out;
1618                 }
1619
1620                 n_wait = (unsigned int) arg;
1621
1622                 /* since we re-run the last frame on underflow, we will
1623                    never actually have n_frames clear frames; at most only
1624                    n_frames - 1 */
1625
1626                 if (n_wait > (video->n_frames-1) ) {
1627                         ret = -EINVAL;
1628                         goto out;
1629                 }
1630
1631                 add_wait_queue(&video->waitq, &wait);
1632                 set_current_state(TASK_INTERRUPTIBLE);
1633
1634                 spin_lock_irqsave(&video->spinlock, flags);
1635
1636                 while (video->n_clear_frames < n_wait) {
1637
1638                         spin_unlock_irqrestore(&video->spinlock, flags);
1639
1640                         if (signal_pending(current)) {
1641                                 remove_wait_queue(&video->waitq, &wait);
1642                                 set_current_state(TASK_RUNNING);
1643                                 ret = -EINTR;
1644                                 goto out;
1645                         }
1646
1647                         schedule();
1648                         set_current_state(TASK_INTERRUPTIBLE);
1649
1650                         spin_lock_irqsave(&video->spinlock, flags);
1651                 }
1652
1653                 spin_unlock_irqrestore(&video->spinlock, flags);
1654
1655                 remove_wait_queue(&video->waitq, &wait);
1656                 set_current_state(TASK_RUNNING);
1657                 ret = 0;
1658                 break;
1659         }
1660
1661         case DV1394_IOC_RECEIVE_FRAMES: {
1662                 unsigned int n_recv;
1663
1664                 if ( !video_card_initialized(video) ) {
1665                         ret = -EINVAL;
1666                         goto out;
1667                 }
1668
1669                 n_recv = (unsigned int) arg;
1670
1671                 /* at least one frame must be active */
1672                 if (n_recv > (video->n_frames-1) ) {
1673                         ret = -EINVAL;
1674                         goto out;
1675                 }
1676
1677                 spin_lock_irqsave(&video->spinlock, flags);
1678
1679                 /* release the clear frames */
1680                 video->n_clear_frames -= n_recv;
1681
1682                 /* advance the clear frame cursor */
1683                 video->first_clear_frame = (video->first_clear_frame + n_recv) % video->n_frames;
1684
1685                 /* reset dropped_frames */
1686                 video->dropped_frames = 0;
1687
1688                 spin_unlock_irqrestore(&video->spinlock, flags);
1689
1690                 ret = 0;
1691                 break;
1692         }
1693
1694         case DV1394_IOC_START_RECEIVE: {
1695                 if ( !video_card_initialized(video) ) {
1696                         ret = do_dv1394_init_default(video);
1697                         if (ret)
1698                                 goto out;
1699                 }
1700
1701                 video->continuity_counter = -1;
1702
1703                 receive_packets(video);
1704
1705                 start_dma_receive(video);
1706
1707                 ret = 0;
1708                 break;
1709         }
1710
1711         case DV1394_IOC_INIT: {
1712                 struct dv1394_init init;
1713                 if (!argp) {
1714                         ret = do_dv1394_init_default(video);
1715                 } else {
1716                         if (copy_from_user(&init, argp, sizeof(init))) {
1717                                 ret = -EFAULT;
1718                                 goto out;
1719                         }
1720                         ret = do_dv1394_init(video, &init);
1721                 }
1722                 break;
1723         }
1724
1725         case DV1394_IOC_SHUTDOWN:
1726                 do_dv1394_shutdown(video, 0);
1727                 ret = 0;
1728                 break;
1729
1730
1731         case DV1394_IOC_GET_STATUS: {
1732                 struct dv1394_status status;
1733
1734                 if ( !video_card_initialized(video) ) {
1735                         ret = -EINVAL;
1736                         goto out;
1737                 }
1738
1739                 status.init.api_version = DV1394_API_VERSION;
1740                 status.init.channel = video->channel;
1741                 status.init.n_frames = video->n_frames;
1742                 status.init.format = video->pal_or_ntsc;
1743                 status.init.cip_n = video->cip_n;
1744                 status.init.cip_d = video->cip_d;
1745                 status.init.syt_offset = video->syt_offset;
1746
1747                 status.first_clear_frame = video->first_clear_frame;
1748
1749                 /* the rest of the fields need to be locked against the interrupt */
1750                 spin_lock_irqsave(&video->spinlock, flags);
1751
1752                 status.active_frame = video->active_frame;
1753                 status.n_clear_frames = video->n_clear_frames;
1754
1755                 status.dropped_frames = video->dropped_frames;
1756
1757                 /* reset dropped_frames */
1758                 video->dropped_frames = 0;
1759
1760                 spin_unlock_irqrestore(&video->spinlock, flags);
1761
1762                 if (copy_to_user(argp, &status, sizeof(status))) {
1763                         ret = -EFAULT;
1764                         goto out;
1765                 }
1766
1767                 ret = 0;
1768                 break;
1769         }
1770
1771         default:
1772                 break;
1773         }
1774
1775  out:
1776         mutex_unlock(&video->mtx);
1777         return ret;
1778 }
1779
1780 /*** DEVICE FILE INTERFACE CONTINUED ***************************************/
1781
1782 static int dv1394_open(struct inode *inode, struct file *file)
1783 {
1784         struct video_card *video = NULL;
1785
1786         if (file->private_data) {
1787                 video = (struct video_card*) file->private_data;
1788
1789         } else {
1790                 /* look up the card by ID */
1791                 unsigned long flags;
1792                 int idx = ieee1394_file_to_instance(file);
1793
1794                 spin_lock_irqsave(&dv1394_cards_lock, flags);
1795                 if (!list_empty(&dv1394_cards)) {
1796                         struct video_card *p;
1797                         list_for_each_entry(p, &dv1394_cards, list) {
1798                                 if ((p->id) == idx) {
1799                                         video = p;
1800                                         break;
1801                                 }
1802                         }
1803                 }
1804                 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
1805
1806                 if (!video) {
1807                         debug_printk("dv1394: OHCI card %d not found", idx);
1808                         return -ENODEV;
1809                 }
1810
1811                 file->private_data = (void*) video;
1812         }
1813
1814 #ifndef DV1394_ALLOW_MORE_THAN_ONE_OPEN
1815
1816         if ( test_and_set_bit(0, &video->open) ) {
1817                 /* video is already open by someone else */
1818                 return -EBUSY;
1819         }
1820
1821 #endif
1822
1823         printk(KERN_INFO "%s: NOTE, the dv1394 interface is unsupported "
1824                "and will not be available in the new firewire driver stack. "
1825                "Try libraw1394 based programs instead.\n", current->comm);
1826
1827         return 0;
1828 }
1829
1830
1831 static int dv1394_release(struct inode *inode, struct file *file)
1832 {
1833         struct video_card *video = file_to_video_card(file);
1834
1835         /* OK to free the DMA buffer, no more mappings can exist */
1836         do_dv1394_shutdown(video, 1);
1837
1838         /* give someone else a turn */
1839         clear_bit(0, &video->open);
1840
1841         return 0;
1842 }
1843
1844
1845 /*** DEVICE DRIVER HANDLERS ************************************************/
1846
1847 static void it_tasklet_func(unsigned long data)
1848 {
1849         int wake = 0;
1850         struct video_card *video = (struct video_card*) data;
1851
1852         spin_lock(&video->spinlock);
1853
1854         if (!video->dma_running)
1855                 goto out;
1856
1857         irq_printk("ContextControl = %08x, CommandPtr = %08x\n",
1858                reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
1859                reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)
1860                );
1861
1862
1863         if ( (video->ohci_it_ctx != -1) &&
1864             (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) {
1865
1866                 struct frame *f;
1867                 unsigned int frame, i;
1868
1869
1870                 if (video->active_frame == -1)
1871                         frame = 0;
1872                 else
1873                         frame = video->active_frame;
1874
1875                 /* check all the DMA-able frames */
1876                 for (i = 0; i < video->n_frames; i++, frame = (frame+1) % video->n_frames) {
1877
1878                         irq_printk("IRQ checking frame %d...", frame);
1879                         f = video->frames[frame];
1880                         if (f->state != FRAME_READY) {
1881                                 irq_printk("clear, skipping\n");
1882                                 /* we don't own this frame */
1883                                 continue;
1884                         }
1885
1886                         irq_printk("DMA\n");
1887
1888                         /* check the frame begin semaphore to see if we can free the previous frame */
1889                         if ( *(f->frame_begin_timestamp) ) {
1890                                 int prev_frame;
1891                                 struct frame *prev_f;
1892
1893
1894
1895                                 /* don't reset, need this later *(f->frame_begin_timestamp) = 0; */
1896                                 irq_printk("  BEGIN\n");
1897
1898                                 prev_frame = frame - 1;
1899                                 if (prev_frame == -1)
1900                                         prev_frame += video->n_frames;
1901                                 prev_f = video->frames[prev_frame];
1902
1903                                 /* make sure we can actually garbage collect
1904                                    this frame */
1905                                 if ( (prev_f->state == FRAME_READY) &&
1906                                     prev_f->done && (!f->done) )
1907                                 {
1908                                         frame_reset(prev_f);
1909                                         video->n_clear_frames++;
1910                                         wake = 1;
1911                                         video->active_frame = frame;
1912
1913                                         irq_printk("  BEGIN - freeing previous frame %d, new active frame is %d\n", prev_frame, frame);
1914                                 } else {
1915                                         irq_printk("  BEGIN - can't free yet\n");
1916                                 }
1917
1918                                 f->done = 1;
1919                         }
1920
1921
1922                         /* see if we need to set the timestamp for the next frame */
1923                         if ( *(f->mid_frame_timestamp) ) {
1924                                 struct frame *next_frame;
1925                                 u32 begin_ts, ts_cyc, ts_off;
1926
1927                                 *(f->mid_frame_timestamp) = 0;
1928
1929                                 begin_ts = le32_to_cpu(*(f->frame_begin_timestamp));
1930
1931                                 irq_printk("  MIDDLE - first packet was sent at cycle %4u (%2u), assigned timestamp was (%2u) %4u\n",
1932                                            begin_ts & 0x1FFF, begin_ts & 0xF,
1933                                            f->assigned_timestamp >> 12, f->assigned_timestamp & 0xFFF);
1934
1935                                 /* prepare next frame and assign timestamp */
1936                                 next_frame = video->frames[ (frame+1) % video->n_frames ];
1937
1938                                 if (next_frame->state == FRAME_READY) {
1939                                         irq_printk("  MIDDLE - next frame is ready, good\n");
1940                                 } else {
1941                                         debug_printk("dv1394: Underflow! At least one frame has been dropped.\n");
1942                                         next_frame = f;
1943                                 }
1944
1945                                 /* set the timestamp to the timestamp of the last frame sent,
1946                                    plus the length of the last frame sent, plus the syt latency */
1947                                 ts_cyc = begin_ts & 0xF;
1948                                 /* advance one frame, plus syt latency (typically 2-3) */
1949                                 ts_cyc += f->n_packets + video->syt_offset ;
1950
1951                                 ts_off = 0;
1952
1953                                 ts_cyc += ts_off/3072;
1954                                 ts_off %= 3072;
1955
1956                                 next_frame->assigned_timestamp = ((ts_cyc&0xF) << 12) + ts_off;
1957                                 if (next_frame->cip_syt1) {
1958                                         next_frame->cip_syt1->b[6] = next_frame->assigned_timestamp >> 8;
1959                                         next_frame->cip_syt1->b[7] = next_frame->assigned_timestamp & 0xFF;
1960                                 }
1961                                 if (next_frame->cip_syt2) {
1962                                         next_frame->cip_syt2->b[6] = next_frame->assigned_timestamp >> 8;
1963                                         next_frame->cip_syt2->b[7] = next_frame->assigned_timestamp & 0xFF;
1964                                 }
1965
1966                         }
1967
1968                         /* see if the frame looped */
1969                         if ( *(f->frame_end_timestamp) ) {
1970
1971                                 *(f->frame_end_timestamp) = 0;
1972
1973                                 debug_printk("  END - the frame looped at least once\n");
1974
1975                                 video->dropped_frames++;
1976                         }
1977
1978                 } /* for (each frame) */
1979         }
1980
1981         if (wake) {
1982                 kill_fasync(&video->fasync, SIGIO, POLL_OUT);
1983
1984                 /* wake readers/writers/ioctl'ers */
1985                 wake_up_interruptible(&video->waitq);
1986         }
1987
1988 out:
1989         spin_unlock(&video->spinlock);
1990 }
1991
1992 static void ir_tasklet_func(unsigned long data)
1993 {
1994         int wake = 0;
1995         struct video_card *video = (struct video_card*) data;
1996
1997         spin_lock(&video->spinlock);
1998
1999         if (!video->dma_running)
2000                 goto out;
2001
2002         if ( (video->ohci_ir_ctx != -1) &&
2003             (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) ) {
2004
2005                 int sof=0; /* start-of-frame flag */
2006                 struct frame *f;
2007                 u16 packet_length, packet_time;
2008                 int i, dbc=0;
2009                 struct DMA_descriptor_block *block = NULL;
2010                 u16 xferstatus;
2011
2012                 int next_i, prev_i;
2013                 struct DMA_descriptor_block *next = NULL;
2014                 dma_addr_t next_dma = 0;
2015                 struct DMA_descriptor_block *prev = NULL;
2016
2017                 /* loop over all descriptors in all frames */
2018                 for (i = 0; i < video->n_frames*MAX_PACKETS; i++) {
2019                         struct packet *p = dma_region_i(&video->packet_buf, struct packet, video->current_packet);
2020
2021                         /* make sure we are seeing the latest changes to p */
2022                         dma_region_sync_for_cpu(&video->packet_buf,
2023                                                 (unsigned long) p - (unsigned long) video->packet_buf.kvirt,
2024                                                 sizeof(struct packet));
2025
2026                         packet_length = le16_to_cpu(p->data_length);
2027                         packet_time   = le16_to_cpu(p->timestamp);
2028
2029                         irq_printk("received packet %02d, timestamp=%04x, length=%04x, sof=%02x%02x\n", video->current_packet,
2030                                    packet_time, packet_length,
2031                                    p->data[0], p->data[1]);
2032
2033                         /* get the descriptor based on packet_buffer cursor */
2034                         f = video->frames[video->current_packet / MAX_PACKETS];
2035                         block = &(f->descriptor_pool[video->current_packet % MAX_PACKETS]);
2036                         xferstatus = le32_to_cpu(block->u.in.il.q[3]) >> 16;
2037                         xferstatus &= 0x1F;
2038                         irq_printk("ir_tasklet_func: xferStatus/resCount [%d] = 0x%08x\n", i, le32_to_cpu(block->u.in.il.q[3]) );
2039
2040                         /* get the current frame */
2041                         f = video->frames[video->active_frame];
2042
2043                         /* exclude empty packet */
2044                         if (packet_length > 8 && xferstatus == 0x11) {
2045                                 /* check for start of frame */
2046                                 /* DRD> Changed to check section type ([0]>>5==0)
2047                                    and dif sequence ([1]>>4==0) */
2048                                 sof = ( (p->data[0] >> 5) == 0 && (p->data[1] >> 4) == 0);
2049
2050                                 dbc = (int) (p->cip_h1 >> 24);
2051                                 if ( video->continuity_counter != -1 && dbc > ((video->continuity_counter + 1) % 256) )
2052                                 {
2053                                         printk(KERN_WARNING "dv1394: discontinuity detected, dropping all frames\n" );
2054                                         video->dropped_frames += video->n_clear_frames + 1;
2055                                         video->first_frame = 0;
2056                                         video->n_clear_frames = 0;
2057                                         video->first_clear_frame = -1;
2058                                 }
2059                                 video->continuity_counter = dbc;
2060
2061                                 if (!video->first_frame) {
2062                                         if (sof) {
2063                                                 video->first_frame = 1;
2064                                         }
2065
2066                                 } else if (sof) {
2067                                         /* close current frame */
2068                                         frame_reset(f);  /* f->state = STATE_CLEAR */
2069                                         video->n_clear_frames++;
2070                                         if (video->n_clear_frames > video->n_frames) {
2071                                                 video->dropped_frames++;
2072                                                 printk(KERN_WARNING "dv1394: dropped a frame during reception\n" );
2073                                                 video->n_clear_frames = video->n_frames-1;
2074                                                 video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
2075                                         }
2076                                         if (video->first_clear_frame == -1)
2077                                                 video->first_clear_frame = video->active_frame;
2078
2079                                         /* get the next frame */
2080                                         video->active_frame = (video->active_frame + 1) % video->n_frames;
2081                                         f = video->frames[video->active_frame];
2082                                         irq_printk("   frame received, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n",
2083                                                    video->active_frame, video->n_clear_frames, video->first_clear_frame);
2084                                 }
2085                                 if (video->first_frame) {
2086                                         if (sof) {
2087                                                 /* open next frame */
2088                                                 f->state = FRAME_READY;
2089                                         }
2090
2091                                         /* copy to buffer */
2092                                         if (f->n_packets > (video->frame_size / 480)) {
2093                                                 printk(KERN_ERR "frame buffer overflow during receive\n");
2094                                         }
2095
2096                                         frame_put_packet(f, p);
2097
2098                                 } /* first_frame */
2099                         }
2100
2101                         /* stop, end of ready packets */
2102                         else if (xferstatus == 0) {
2103                                 break;
2104                         }
2105
2106                         /* reset xferStatus & resCount */
2107                         block->u.in.il.q[3] = cpu_to_le32(512);
2108
2109                         /* terminate dma chain at this (next) packet */
2110                         next_i = video->current_packet;
2111                         f = video->frames[next_i / MAX_PACKETS];
2112                         next = &(f->descriptor_pool[next_i % MAX_PACKETS]);
2113                         next_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
2114                         next->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */
2115                         next->u.in.il.q[2] = cpu_to_le32(0); /* disable branch */
2116
2117                         /* link previous to next */
2118                         prev_i = (next_i == 0) ? (MAX_PACKETS * video->n_frames - 1) : (next_i - 1);
2119                         f = video->frames[prev_i / MAX_PACKETS];
2120                         prev = &(f->descriptor_pool[prev_i % MAX_PACKETS]);
2121                         if (prev_i % (MAX_PACKETS/2)) {
2122                                 prev->u.in.il.q[0] &= ~cpu_to_le32(3 << 20); /* no interrupt */
2123                         } else {
2124                                 prev->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */
2125                         }
2126                         prev->u.in.il.q[2] = cpu_to_le32(next_dma | 1); /* set Z=1 */
2127                         wmb();
2128
2129                         /* wake up DMA in case it fell asleep */
2130                         reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
2131
2132                         /* advance packet_buffer cursor */
2133                         video->current_packet = (video->current_packet + 1) % (MAX_PACKETS * video->n_frames);
2134
2135                 } /* for all packets */
2136
2137                 wake = 1; /* why the hell not? */
2138
2139         } /* receive interrupt */
2140
2141         if (wake) {
2142                 kill_fasync(&video->fasync, SIGIO, POLL_IN);
2143
2144                 /* wake readers/writers/ioctl'ers */
2145                 wake_up_interruptible(&video->waitq);
2146         }
2147
2148 out:
2149         spin_unlock(&video->spinlock);
2150 }
2151
2152 static struct cdev dv1394_cdev;
2153 static const struct file_operations dv1394_fops=
2154 {
2155         .owner =        THIS_MODULE,
2156         .poll =         dv1394_poll,
2157         .unlocked_ioctl = dv1394_ioctl,
2158 #ifdef CONFIG_COMPAT
2159         .compat_ioctl = dv1394_compat_ioctl,
2160 #endif
2161         .mmap =         dv1394_mmap,
2162         .open =         dv1394_open,
2163         .write =        dv1394_write,
2164         .read =         dv1394_read,
2165         .release =      dv1394_release,
2166         .fasync =       dv1394_fasync,
2167 };
2168
2169
2170 /*** HOTPLUG STUFF **********************************************************/
2171 /*
2172  * Export information about protocols/devices supported by this driver.
2173  */
2174 #ifdef MODULE
2175 static const struct ieee1394_device_id dv1394_id_table[] = {
2176         {
2177                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
2178                 .specifier_id   = AVC_UNIT_SPEC_ID_ENTRY & 0xffffff,
2179                 .version        = AVC_SW_VERSION_ENTRY & 0xffffff
2180         },
2181         { }
2182 };
2183
2184 MODULE_DEVICE_TABLE(ieee1394, dv1394_id_table);
2185 #endif /* MODULE */
2186
2187 static struct hpsb_protocol_driver dv1394_driver = {
2188         .name = "dv1394",
2189 };
2190
2191
2192 /*** IEEE1394 HPSB CALLBACKS ***********************************************/
2193
2194 static int dv1394_init(struct ti_ohci *ohci, enum pal_or_ntsc format, enum modes mode)
2195 {
2196         struct video_card *video;
2197         unsigned long flags;
2198         int i;
2199
2200         video = kzalloc(sizeof(*video), GFP_KERNEL);
2201         if (!video) {
2202                 printk(KERN_ERR "dv1394: cannot allocate video_card\n");
2203                 return -1;
2204         }
2205
2206         video->ohci = ohci;
2207         /* lower 2 bits of id indicate which of four "plugs"
2208            per host */
2209         video->id = ohci->host->id << 2;
2210         if (format == DV1394_NTSC)
2211                 video->id |= mode;
2212         else
2213                 video->id |= 2 + mode;
2214
2215         video->ohci_it_ctx = -1;
2216         video->ohci_ir_ctx = -1;
2217
2218         video->ohci_IsoXmitContextControlSet = 0;
2219         video->ohci_IsoXmitContextControlClear = 0;
2220         video->ohci_IsoXmitCommandPtr = 0;
2221
2222         video->ohci_IsoRcvContextControlSet = 0;
2223         video->ohci_IsoRcvContextControlClear = 0;
2224         video->ohci_IsoRcvCommandPtr = 0;
2225         video->ohci_IsoRcvContextMatch = 0;
2226
2227         video->n_frames = 0; /* flag that video is not initialized */
2228         video->channel = 63; /* default to broadcast channel */
2229         video->active_frame = -1;
2230
2231         /* initialize the following */
2232         video->pal_or_ntsc = format;
2233         video->cip_n = 0; /* 0 = use builtin default */
2234         video->cip_d = 0;
2235         video->syt_offset = 0;
2236         video->mode = mode;
2237
2238         for (i = 0; i < DV1394_MAX_FRAMES; i++)
2239                 video->frames[i] = NULL;
2240
2241         dma_region_init(&video->dv_buf);
2242         video->dv_buf_size = 0;
2243         dma_region_init(&video->packet_buf);
2244         video->packet_buf_size = 0;
2245
2246         clear_bit(0, &video->open);
2247         spin_lock_init(&video->spinlock);
2248         video->dma_running = 0;
2249         mutex_init(&video->mtx);
2250         init_waitqueue_head(&video->waitq);
2251         video->fasync = NULL;
2252
2253         spin_lock_irqsave(&dv1394_cards_lock, flags);
2254         INIT_LIST_HEAD(&video->list);
2255         list_add_tail(&video->list, &dv1394_cards);
2256         spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2257
2258         debug_printk("dv1394: dv1394_init() OK on ID %d\n", video->id);
2259         return 0;
2260 }
2261
2262 static void dv1394_remove_host(struct hpsb_host *host)
2263 {
2264         struct video_card *video, *tmp_video;
2265         unsigned long flags;
2266         int found_ohci_card = 0;
2267
2268         do {
2269                 video = NULL;
2270                 spin_lock_irqsave(&dv1394_cards_lock, flags);
2271                 list_for_each_entry(tmp_video, &dv1394_cards, list) {
2272                         if ((tmp_video->id >> 2) == host->id) {
2273                                 list_del(&tmp_video->list);
2274                                 video = tmp_video;
2275                                 found_ohci_card = 1;
2276                                 break;
2277                         }
2278                 }
2279                 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2280
2281                 if (video) {
2282                         do_dv1394_shutdown(video, 1);
2283                         kfree(video);
2284                 }
2285         } while (video);
2286
2287         if (found_ohci_card)
2288                 device_destroy(hpsb_protocol_class, MKDEV(IEEE1394_MAJOR,
2289                            IEEE1394_MINOR_BLOCK_DV1394 * 16 + (host->id << 2)));
2290 }
2291
2292 static void dv1394_add_host(struct hpsb_host *host)
2293 {
2294         struct ti_ohci *ohci;
2295         int id = host->id;
2296
2297         /* We only work with the OHCI-1394 driver */
2298         if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
2299                 return;
2300
2301         ohci = (struct ti_ohci *)host->hostdata;
2302
2303         device_create(hpsb_protocol_class, NULL,
2304                       MKDEV(IEEE1394_MAJOR,
2305                             IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2)),
2306                       NULL, "dv1394-%d", id);
2307
2308         dv1394_init(ohci, DV1394_NTSC, MODE_RECEIVE);
2309         dv1394_init(ohci, DV1394_NTSC, MODE_TRANSMIT);
2310         dv1394_init(ohci, DV1394_PAL, MODE_RECEIVE);
2311         dv1394_init(ohci, DV1394_PAL, MODE_TRANSMIT);
2312 }
2313
2314
2315 /* Bus reset handler. In the event of a bus reset, we may need to
2316    re-start the DMA contexts - otherwise the user program would
2317    end up waiting forever.
2318 */
2319
2320 static void dv1394_host_reset(struct hpsb_host *host)
2321 {
2322         struct ti_ohci *ohci;
2323         struct video_card *video = NULL, *tmp_vid;
2324         unsigned long flags;
2325
2326         /* We only work with the OHCI-1394 driver */
2327         if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
2328                 return;
2329
2330         ohci = (struct ti_ohci *)host->hostdata;
2331
2332
2333         /* find the corresponding video_cards */
2334         spin_lock_irqsave(&dv1394_cards_lock, flags);
2335         list_for_each_entry(tmp_vid, &dv1394_cards, list) {
2336                 if ((tmp_vid->id >> 2) == host->id) {
2337                         video = tmp_vid;
2338                         break;
2339                 }
2340         }
2341         spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2342
2343         if (!video)
2344                 return;
2345
2346
2347         spin_lock_irqsave(&video->spinlock, flags);
2348
2349         if (!video->dma_running)
2350                 goto out;
2351
2352         /* check IT context */
2353         if (video->ohci_it_ctx != -1) {
2354                 u32 ctx;
2355
2356                 ctx = reg_read(video->ohci, video->ohci_IsoXmitContextControlSet);
2357
2358                 /* if (RUN but not ACTIVE) */
2359                 if ( (ctx & (1<<15)) &&
2360                     !(ctx & (1<<10)) ) {
2361
2362                         debug_printk("dv1394: IT context stopped due to bus reset; waking it up\n");
2363
2364                         /* to be safe, assume a frame has been dropped. User-space programs
2365                            should handle this condition like an underflow. */
2366                         video->dropped_frames++;
2367
2368                         /* for some reason you must clear, then re-set the RUN bit to restart DMA */
2369
2370                         /* clear RUN */
2371                         reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15));
2372                         flush_pci_write(video->ohci);
2373
2374                         /* set RUN */
2375                         reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 15));
2376                         flush_pci_write(video->ohci);
2377
2378                         /* set the WAKE bit (just in case; this isn't strictly necessary) */
2379                         reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 12));
2380                         flush_pci_write(video->ohci);
2381
2382                         irq_printk("dv1394: AFTER IT restart ctx 0x%08x ptr 0x%08x\n",
2383                                    reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
2384                                    reg_read(video->ohci, video->ohci_IsoXmitCommandPtr));
2385                 }
2386         }
2387
2388         /* check IR context */
2389         if (video->ohci_ir_ctx != -1) {
2390                 u32 ctx;
2391
2392                 ctx = reg_read(video->ohci, video->ohci_IsoRcvContextControlSet);
2393
2394                 /* if (RUN but not ACTIVE) */
2395                 if ( (ctx & (1<<15)) &&
2396                     !(ctx & (1<<10)) ) {
2397
2398                         debug_printk("dv1394: IR context stopped due to bus reset; waking it up\n");
2399
2400                         /* to be safe, assume a frame has been dropped. User-space programs
2401                            should handle this condition like an overflow. */
2402                         video->dropped_frames++;
2403
2404                         /* for some reason you must clear, then re-set the RUN bit to restart DMA */
2405                         /* XXX this doesn't work for me, I can't get IR DMA to restart :[ */
2406
2407                         /* clear RUN */
2408                         reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15));
2409                         flush_pci_write(video->ohci);
2410
2411                         /* set RUN */
2412                         reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 15));
2413                         flush_pci_write(video->ohci);
2414
2415                         /* set the WAKE bit (just in case; this isn't strictly necessary) */
2416                         reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
2417                         flush_pci_write(video->ohci);
2418
2419                         irq_printk("dv1394: AFTER IR restart ctx 0x%08x ptr 0x%08x\n",
2420                                    reg_read(video->ohci, video->ohci_IsoRcvContextControlSet),
2421                                    reg_read(video->ohci, video->ohci_IsoRcvCommandPtr));
2422                 }
2423         }
2424
2425 out:
2426         spin_unlock_irqrestore(&video->spinlock, flags);
2427
2428         /* wake readers/writers/ioctl'ers */
2429         wake_up_interruptible(&video->waitq);
2430 }
2431
2432 static struct hpsb_highlevel dv1394_highlevel = {
2433         .name =         "dv1394",
2434         .add_host =     dv1394_add_host,
2435         .remove_host =  dv1394_remove_host,
2436         .host_reset =   dv1394_host_reset,
2437 };
2438
2439 #ifdef CONFIG_COMPAT
2440
2441 #define DV1394_IOC32_INIT       _IOW('#', 0x06, struct dv1394_init32)
2442 #define DV1394_IOC32_GET_STATUS _IOR('#', 0x0c, struct dv1394_status32)
2443
2444 struct dv1394_init32 {
2445         u32 api_version;
2446         u32 channel;
2447         u32 n_frames;
2448         u32 format;
2449         u32 cip_n;
2450         u32 cip_d;
2451         u32 syt_offset;
2452 };
2453
2454 struct dv1394_status32 {
2455         struct dv1394_init32 init;
2456         s32 active_frame;
2457         u32 first_clear_frame;
2458         u32 n_clear_frames;
2459         u32 dropped_frames;
2460 };
2461
2462 /* RED-PEN: this should use compat_alloc_userspace instead */
2463
2464 static int handle_dv1394_init(struct file *file, unsigned int cmd, unsigned long arg)
2465 {
2466         struct dv1394_init32 dv32;
2467         struct dv1394_init dv;
2468         mm_segment_t old_fs;
2469         int ret;
2470
2471         if (file->f_op->unlocked_ioctl != dv1394_ioctl)
2472                 return -EFAULT;
2473
2474         if (copy_from_user(&dv32, (void __user *)arg, sizeof(dv32)))
2475                 return -EFAULT;
2476
2477         dv.api_version = dv32.api_version;
2478         dv.channel = dv32.channel;
2479         dv.n_frames = dv32.n_frames;
2480         dv.format = dv32.format;
2481         dv.cip_n = (unsigned long)dv32.cip_n;
2482         dv.cip_d = (unsigned long)dv32.cip_d;
2483         dv.syt_offset = dv32.syt_offset;
2484
2485         old_fs = get_fs();
2486         set_fs(KERNEL_DS);
2487         ret = dv1394_ioctl(file, DV1394_IOC_INIT, (unsigned long)&dv);
2488         set_fs(old_fs);
2489
2490         return ret;
2491 }
2492
2493 static int handle_dv1394_get_status(struct file *file, unsigned int cmd, unsigned long arg)
2494 {
2495         struct dv1394_status32 dv32;
2496         struct dv1394_status dv;
2497         mm_segment_t old_fs;
2498         int ret;
2499
2500         if (file->f_op->unlocked_ioctl != dv1394_ioctl)
2501                 return -EFAULT;
2502
2503         old_fs = get_fs();
2504         set_fs(KERNEL_DS);
2505         ret = dv1394_ioctl(file, DV1394_IOC_GET_STATUS, (unsigned long)&dv);
2506         set_fs(old_fs);
2507
2508         if (!ret) {
2509                 dv32.init.api_version = dv.init.api_version;
2510                 dv32.init.channel = dv.init.channel;
2511                 dv32.init.n_frames = dv.init.n_frames;
2512                 dv32.init.format = dv.init.format;
2513                 dv32.init.cip_n = (u32)dv.init.cip_n;
2514                 dv32.init.cip_d = (u32)dv.init.cip_d;
2515                 dv32.init.syt_offset = dv.init.syt_offset;
2516                 dv32.active_frame = dv.active_frame;
2517                 dv32.first_clear_frame = dv.first_clear_frame;
2518                 dv32.n_clear_frames = dv.n_clear_frames;
2519                 dv32.dropped_frames = dv.dropped_frames;
2520
2521                 if (copy_to_user((struct dv1394_status32 __user *)arg, &dv32, sizeof(dv32)))
2522                         ret = -EFAULT;
2523         }
2524
2525         return ret;
2526 }
2527
2528
2529
2530 static long dv1394_compat_ioctl(struct file *file, unsigned int cmd,
2531                                unsigned long arg)
2532 {
2533         switch (cmd) {
2534         case DV1394_IOC_SHUTDOWN:
2535         case DV1394_IOC_SUBMIT_FRAMES:
2536         case DV1394_IOC_WAIT_FRAMES:
2537         case DV1394_IOC_RECEIVE_FRAMES:
2538         case DV1394_IOC_START_RECEIVE:
2539                 return dv1394_ioctl(file, cmd, arg);
2540
2541         case DV1394_IOC32_INIT:
2542                 return handle_dv1394_init(file, cmd, arg);
2543         case DV1394_IOC32_GET_STATUS:
2544                 return handle_dv1394_get_status(file, cmd, arg);
2545         default:
2546                 return -ENOIOCTLCMD;
2547         }
2548 }
2549
2550 #endif /* CONFIG_COMPAT */
2551
2552
2553 /*** KERNEL MODULE HANDLERS ************************************************/
2554
2555 MODULE_AUTHOR("Dan Maas <dmaas@dcine.com>, Dan Dennedy <dan@dennedy.org>");
2556 MODULE_DESCRIPTION("driver for DV input/output on OHCI board");
2557 MODULE_SUPPORTED_DEVICE("dv1394");
2558 MODULE_LICENSE("GPL");
2559
2560 static void __exit dv1394_exit_module(void)
2561 {
2562         hpsb_unregister_protocol(&dv1394_driver);
2563         hpsb_unregister_highlevel(&dv1394_highlevel);
2564         cdev_del(&dv1394_cdev);
2565 }
2566
2567 static int __init dv1394_init_module(void)
2568 {
2569         int ret;
2570
2571         cdev_init(&dv1394_cdev, &dv1394_fops);
2572         dv1394_cdev.owner = THIS_MODULE;
2573         ret = cdev_add(&dv1394_cdev, IEEE1394_DV1394_DEV, 16);
2574         if (ret) {
2575                 printk(KERN_ERR "dv1394: unable to register character device\n");
2576                 return ret;
2577         }
2578
2579         hpsb_register_highlevel(&dv1394_highlevel);
2580
2581         ret = hpsb_register_protocol(&dv1394_driver);
2582         if (ret) {
2583                 printk(KERN_ERR "dv1394: failed to register protocol\n");
2584                 hpsb_unregister_highlevel(&dv1394_highlevel);
2585                 cdev_del(&dv1394_cdev);
2586                 return ret;
2587         }
2588
2589         return 0;
2590 }
2591
2592 module_init(dv1394_init_module);
2593 module_exit(dv1394_exit_module);