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         u32 *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         u32 *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         int retval = fasync_helper(fd, file, on, &video->fasync);
1329
1330         if (retval < 0)
1331                 return retval;
1332         return 0;
1333 }
1334
1335 static ssize_t dv1394_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
1336 {
1337         struct video_card *video = file_to_video_card(file);
1338         DECLARE_WAITQUEUE(wait, current);
1339         ssize_t ret;
1340         size_t cnt;
1341         unsigned long flags;
1342         int target_frame;
1343
1344         /* serialize this to prevent multi-threaded mayhem */
1345         if (file->f_flags & O_NONBLOCK) {
1346                 if (!mutex_trylock(&video->mtx))
1347                         return -EAGAIN;
1348         } else {
1349                 if (mutex_lock_interruptible(&video->mtx))
1350                         return -ERESTARTSYS;
1351         }
1352
1353         if ( !video_card_initialized(video) ) {
1354                 ret = do_dv1394_init_default(video);
1355                 if (ret) {
1356                         mutex_unlock(&video->mtx);
1357                         return ret;
1358                 }
1359         }
1360
1361         ret = 0;
1362         add_wait_queue(&video->waitq, &wait);
1363
1364         while (count > 0) {
1365
1366                 /* must set TASK_INTERRUPTIBLE *before* checking for free
1367                    buffers; otherwise we could miss a wakeup if the interrupt
1368                    fires between the check and the schedule() */
1369
1370                 set_current_state(TASK_INTERRUPTIBLE);
1371
1372                 spin_lock_irqsave(&video->spinlock, flags);
1373
1374                 target_frame = video->first_clear_frame;
1375
1376                 spin_unlock_irqrestore(&video->spinlock, flags);
1377
1378                 if (video->frames[target_frame]->state == FRAME_CLEAR) {
1379
1380                         /* how much room is left in the target frame buffer */
1381                         cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
1382
1383                 } else {
1384                         /* buffer is already used */
1385                         cnt = 0;
1386                 }
1387
1388                 if (cnt > count)
1389                         cnt = count;
1390
1391                 if (cnt <= 0) {
1392                         /* no room left, gotta wait */
1393                         if (file->f_flags & O_NONBLOCK) {
1394                                 if (!ret)
1395                                         ret = -EAGAIN;
1396                                 break;
1397                         }
1398                         if (signal_pending(current)) {
1399                                 if (!ret)
1400                                         ret = -ERESTARTSYS;
1401                                 break;
1402                         }
1403
1404                         schedule();
1405
1406                         continue; /* start over from 'while(count > 0)...' */
1407                 }
1408
1409                 if (copy_from_user(video->dv_buf.kvirt + video->write_off, buffer, cnt)) {
1410                         if (!ret)
1411                                 ret = -EFAULT;
1412                         break;
1413                 }
1414
1415                 video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
1416
1417                 count -= cnt;
1418                 buffer += cnt;
1419                 ret += cnt;
1420
1421                 if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames))
1422                                 frame_prepare(video, target_frame);
1423         }
1424
1425         remove_wait_queue(&video->waitq, &wait);
1426         set_current_state(TASK_RUNNING);
1427         mutex_unlock(&video->mtx);
1428         return ret;
1429 }
1430
1431
1432 static ssize_t dv1394_read(struct file *file,  char __user *buffer, size_t count, loff_t *ppos)
1433 {
1434         struct video_card *video = file_to_video_card(file);
1435         DECLARE_WAITQUEUE(wait, current);
1436         ssize_t ret;
1437         size_t cnt;
1438         unsigned long flags;
1439         int target_frame;
1440
1441         /* serialize this to prevent multi-threaded mayhem */
1442         if (file->f_flags & O_NONBLOCK) {
1443                 if (!mutex_trylock(&video->mtx))
1444                         return -EAGAIN;
1445         } else {
1446                 if (mutex_lock_interruptible(&video->mtx))
1447                         return -ERESTARTSYS;
1448         }
1449
1450         if ( !video_card_initialized(video) ) {
1451                 ret = do_dv1394_init_default(video);
1452                 if (ret) {
1453                         mutex_unlock(&video->mtx);
1454                         return ret;
1455                 }
1456                 video->continuity_counter = -1;
1457
1458                 receive_packets(video);
1459
1460                 start_dma_receive(video);
1461         }
1462
1463         ret = 0;
1464         add_wait_queue(&video->waitq, &wait);
1465
1466         while (count > 0) {
1467
1468                 /* must set TASK_INTERRUPTIBLE *before* checking for free
1469                    buffers; otherwise we could miss a wakeup if the interrupt
1470                    fires between the check and the schedule() */
1471
1472                 set_current_state(TASK_INTERRUPTIBLE);
1473
1474                 spin_lock_irqsave(&video->spinlock, flags);
1475
1476                 target_frame = video->first_clear_frame;
1477
1478                 spin_unlock_irqrestore(&video->spinlock, flags);
1479
1480                 if (target_frame >= 0 &&
1481                         video->n_clear_frames > 0 &&
1482                         video->frames[target_frame]->state == FRAME_CLEAR) {
1483
1484                         /* how much room is left in the target frame buffer */
1485                         cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
1486
1487                 } else {
1488                         /* buffer is already used */
1489                         cnt = 0;
1490                 }
1491
1492                 if (cnt > count)
1493                         cnt = count;
1494
1495                 if (cnt <= 0) {
1496                         /* no room left, gotta wait */
1497                         if (file->f_flags & O_NONBLOCK) {
1498                                 if (!ret)
1499                                         ret = -EAGAIN;
1500                                 break;
1501                         }
1502                         if (signal_pending(current)) {
1503                                 if (!ret)
1504                                         ret = -ERESTARTSYS;
1505                                 break;
1506                         }
1507
1508                         schedule();
1509
1510                         continue; /* start over from 'while(count > 0)...' */
1511                 }
1512
1513                 if (copy_to_user(buffer, video->dv_buf.kvirt + video->write_off, cnt)) {
1514                                 if (!ret)
1515                                         ret = -EFAULT;
1516                                 break;
1517                 }
1518
1519                 video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
1520
1521                 count -= cnt;
1522                 buffer += cnt;
1523                 ret += cnt;
1524
1525                 if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames)) {
1526                         spin_lock_irqsave(&video->spinlock, flags);
1527                         video->n_clear_frames--;
1528                         video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
1529                         spin_unlock_irqrestore(&video->spinlock, flags);
1530                 }
1531         }
1532
1533         remove_wait_queue(&video->waitq, &wait);
1534         set_current_state(TASK_RUNNING);
1535         mutex_unlock(&video->mtx);
1536         return ret;
1537 }
1538
1539
1540 /*** DEVICE IOCTL INTERFACE ************************************************/
1541
1542 static long dv1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1543 {
1544         struct video_card *video = file_to_video_card(file);
1545         unsigned long flags;
1546         int ret = -EINVAL;
1547         void __user *argp = (void __user *)arg;
1548
1549         DECLARE_WAITQUEUE(wait, current);
1550
1551         /* serialize this to prevent multi-threaded mayhem */
1552         if (file->f_flags & O_NONBLOCK) {
1553                 if (!mutex_trylock(&video->mtx))
1554                         return -EAGAIN;
1555         } else {
1556                 if (mutex_lock_interruptible(&video->mtx))
1557                         return -ERESTARTSYS;
1558         }
1559
1560         switch(cmd)
1561         {
1562         case DV1394_IOC_SUBMIT_FRAMES: {
1563                 unsigned int n_submit;
1564
1565                 if ( !video_card_initialized(video) ) {
1566                         ret = do_dv1394_init_default(video);
1567                         if (ret)
1568                                 goto out;
1569                 }
1570
1571                 n_submit = (unsigned int) arg;
1572
1573                 if (n_submit > video->n_frames) {
1574                         ret = -EINVAL;
1575                         goto out;
1576                 }
1577
1578                 while (n_submit > 0) {
1579
1580                         add_wait_queue(&video->waitq, &wait);
1581                         set_current_state(TASK_INTERRUPTIBLE);
1582
1583                         spin_lock_irqsave(&video->spinlock, flags);
1584
1585                         /* wait until video->first_clear_frame is really CLEAR */
1586                         while (video->frames[video->first_clear_frame]->state != FRAME_CLEAR) {
1587
1588                                 spin_unlock_irqrestore(&video->spinlock, flags);
1589
1590                                 if (signal_pending(current)) {
1591                                         remove_wait_queue(&video->waitq, &wait);
1592                                         set_current_state(TASK_RUNNING);
1593                                         ret = -EINTR;
1594                                         goto out;
1595                                 }
1596
1597                                 schedule();
1598                                 set_current_state(TASK_INTERRUPTIBLE);
1599
1600                                 spin_lock_irqsave(&video->spinlock, flags);
1601                         }
1602                         spin_unlock_irqrestore(&video->spinlock, flags);
1603
1604                         remove_wait_queue(&video->waitq, &wait);
1605                         set_current_state(TASK_RUNNING);
1606
1607                         frame_prepare(video, video->first_clear_frame);
1608
1609                         n_submit--;
1610                 }
1611
1612                 ret = 0;
1613                 break;
1614         }
1615
1616         case DV1394_IOC_WAIT_FRAMES: {
1617                 unsigned int n_wait;
1618
1619                 if ( !video_card_initialized(video) ) {
1620                         ret = -EINVAL;
1621                         goto out;
1622                 }
1623
1624                 n_wait = (unsigned int) arg;
1625
1626                 /* since we re-run the last frame on underflow, we will
1627                    never actually have n_frames clear frames; at most only
1628                    n_frames - 1 */
1629
1630                 if (n_wait > (video->n_frames-1) ) {
1631                         ret = -EINVAL;
1632                         goto out;
1633                 }
1634
1635                 add_wait_queue(&video->waitq, &wait);
1636                 set_current_state(TASK_INTERRUPTIBLE);
1637
1638                 spin_lock_irqsave(&video->spinlock, flags);
1639
1640                 while (video->n_clear_frames < n_wait) {
1641
1642                         spin_unlock_irqrestore(&video->spinlock, flags);
1643
1644                         if (signal_pending(current)) {
1645                                 remove_wait_queue(&video->waitq, &wait);
1646                                 set_current_state(TASK_RUNNING);
1647                                 ret = -EINTR;
1648                                 goto out;
1649                         }
1650
1651                         schedule();
1652                         set_current_state(TASK_INTERRUPTIBLE);
1653
1654                         spin_lock_irqsave(&video->spinlock, flags);
1655                 }
1656
1657                 spin_unlock_irqrestore(&video->spinlock, flags);
1658
1659                 remove_wait_queue(&video->waitq, &wait);
1660                 set_current_state(TASK_RUNNING);
1661                 ret = 0;
1662                 break;
1663         }
1664
1665         case DV1394_IOC_RECEIVE_FRAMES: {
1666                 unsigned int n_recv;
1667
1668                 if ( !video_card_initialized(video) ) {
1669                         ret = -EINVAL;
1670                         goto out;
1671                 }
1672
1673                 n_recv = (unsigned int) arg;
1674
1675                 /* at least one frame must be active */
1676                 if (n_recv > (video->n_frames-1) ) {
1677                         ret = -EINVAL;
1678                         goto out;
1679                 }
1680
1681                 spin_lock_irqsave(&video->spinlock, flags);
1682
1683                 /* release the clear frames */
1684                 video->n_clear_frames -= n_recv;
1685
1686                 /* advance the clear frame cursor */
1687                 video->first_clear_frame = (video->first_clear_frame + n_recv) % video->n_frames;
1688
1689                 /* reset dropped_frames */
1690                 video->dropped_frames = 0;
1691
1692                 spin_unlock_irqrestore(&video->spinlock, flags);
1693
1694                 ret = 0;
1695                 break;
1696         }
1697
1698         case DV1394_IOC_START_RECEIVE: {
1699                 if ( !video_card_initialized(video) ) {
1700                         ret = do_dv1394_init_default(video);
1701                         if (ret)
1702                                 goto out;
1703                 }
1704
1705                 video->continuity_counter = -1;
1706
1707                 receive_packets(video);
1708
1709                 start_dma_receive(video);
1710
1711                 ret = 0;
1712                 break;
1713         }
1714
1715         case DV1394_IOC_INIT: {
1716                 struct dv1394_init init;
1717                 if (!argp) {
1718                         ret = do_dv1394_init_default(video);
1719                 } else {
1720                         if (copy_from_user(&init, argp, sizeof(init))) {
1721                                 ret = -EFAULT;
1722                                 goto out;
1723                         }
1724                         ret = do_dv1394_init(video, &init);
1725                 }
1726                 break;
1727         }
1728
1729         case DV1394_IOC_SHUTDOWN:
1730                 do_dv1394_shutdown(video, 0);
1731                 ret = 0;
1732                 break;
1733
1734
1735         case DV1394_IOC_GET_STATUS: {
1736                 struct dv1394_status status;
1737
1738                 if ( !video_card_initialized(video) ) {
1739                         ret = -EINVAL;
1740                         goto out;
1741                 }
1742
1743                 status.init.api_version = DV1394_API_VERSION;
1744                 status.init.channel = video->channel;
1745                 status.init.n_frames = video->n_frames;
1746                 status.init.format = video->pal_or_ntsc;
1747                 status.init.cip_n = video->cip_n;
1748                 status.init.cip_d = video->cip_d;
1749                 status.init.syt_offset = video->syt_offset;
1750
1751                 status.first_clear_frame = video->first_clear_frame;
1752
1753                 /* the rest of the fields need to be locked against the interrupt */
1754                 spin_lock_irqsave(&video->spinlock, flags);
1755
1756                 status.active_frame = video->active_frame;
1757                 status.n_clear_frames = video->n_clear_frames;
1758
1759                 status.dropped_frames = video->dropped_frames;
1760
1761                 /* reset dropped_frames */
1762                 video->dropped_frames = 0;
1763
1764                 spin_unlock_irqrestore(&video->spinlock, flags);
1765
1766                 if (copy_to_user(argp, &status, sizeof(status))) {
1767                         ret = -EFAULT;
1768                         goto out;
1769                 }
1770
1771                 ret = 0;
1772                 break;
1773         }
1774
1775         default:
1776                 break;
1777         }
1778
1779  out:
1780         mutex_unlock(&video->mtx);
1781         return ret;
1782 }
1783
1784 /*** DEVICE FILE INTERFACE CONTINUED ***************************************/
1785
1786 static int dv1394_open(struct inode *inode, struct file *file)
1787 {
1788         struct video_card *video = NULL;
1789
1790         if (file->private_data) {
1791                 video = (struct video_card*) file->private_data;
1792
1793         } else {
1794                 /* look up the card by ID */
1795                 unsigned long flags;
1796
1797                 spin_lock_irqsave(&dv1394_cards_lock, flags);
1798                 if (!list_empty(&dv1394_cards)) {
1799                         struct video_card *p;
1800                         list_for_each_entry(p, &dv1394_cards, list) {
1801                                 if ((p->id) == ieee1394_file_to_instance(file)) {
1802                                         video = p;
1803                                         break;
1804                                 }
1805                         }
1806                 }
1807                 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
1808
1809                 if (!video) {
1810                         debug_printk("dv1394: OHCI card %d not found", ieee1394_file_to_instance(file));
1811                         return -ENODEV;
1812                 }
1813
1814                 file->private_data = (void*) video;
1815         }
1816
1817 #ifndef DV1394_ALLOW_MORE_THAN_ONE_OPEN
1818
1819         if ( test_and_set_bit(0, &video->open) ) {
1820                 /* video is already open by someone else */
1821                 return -EBUSY;
1822         }
1823
1824 #endif
1825
1826         return 0;
1827 }
1828
1829
1830 static int dv1394_release(struct inode *inode, struct file *file)
1831 {
1832         struct video_card *video = file_to_video_card(file);
1833
1834         /* OK to free the DMA buffer, no more mappings can exist */
1835         do_dv1394_shutdown(video, 1);
1836
1837         /* give someone else a turn */
1838         clear_bit(0, &video->open);
1839
1840         return 0;
1841 }
1842
1843
1844 /*** DEVICE DRIVER HANDLERS ************************************************/
1845
1846 static void it_tasklet_func(unsigned long data)
1847 {
1848         int wake = 0;
1849         struct video_card *video = (struct video_card*) data;
1850
1851         spin_lock(&video->spinlock);
1852
1853         if (!video->dma_running)
1854                 goto out;
1855
1856         irq_printk("ContextControl = %08x, CommandPtr = %08x\n",
1857                reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
1858                reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)
1859                );
1860
1861
1862         if ( (video->ohci_it_ctx != -1) &&
1863             (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) {
1864
1865                 struct frame *f;
1866                 unsigned int frame, i;
1867
1868
1869                 if (video->active_frame == -1)
1870                         frame = 0;
1871                 else
1872                         frame = video->active_frame;
1873
1874                 /* check all the DMA-able frames */
1875                 for (i = 0; i < video->n_frames; i++, frame = (frame+1) % video->n_frames) {
1876
1877                         irq_printk("IRQ checking frame %d...", frame);
1878                         f = video->frames[frame];
1879                         if (f->state != FRAME_READY) {
1880                                 irq_printk("clear, skipping\n");
1881                                 /* we don't own this frame */
1882                                 continue;
1883                         }
1884
1885                         irq_printk("DMA\n");
1886
1887                         /* check the frame begin semaphore to see if we can free the previous frame */
1888                         if ( *(f->frame_begin_timestamp) ) {
1889                                 int prev_frame;
1890                                 struct frame *prev_f;
1891
1892
1893
1894                                 /* don't reset, need this later *(f->frame_begin_timestamp) = 0; */
1895                                 irq_printk("  BEGIN\n");
1896
1897                                 prev_frame = frame - 1;
1898                                 if (prev_frame == -1)
1899                                         prev_frame += video->n_frames;
1900                                 prev_f = video->frames[prev_frame];
1901
1902                                 /* make sure we can actually garbage collect
1903                                    this frame */
1904                                 if ( (prev_f->state == FRAME_READY) &&
1905                                     prev_f->done && (!f->done) )
1906                                 {
1907                                         frame_reset(prev_f);
1908                                         video->n_clear_frames++;
1909                                         wake = 1;
1910                                         video->active_frame = frame;
1911
1912                                         irq_printk("  BEGIN - freeing previous frame %d, new active frame is %d\n", prev_frame, frame);
1913                                 } else {
1914                                         irq_printk("  BEGIN - can't free yet\n");
1915                                 }
1916
1917                                 f->done = 1;
1918                         }
1919
1920
1921                         /* see if we need to set the timestamp for the next frame */
1922                         if ( *(f->mid_frame_timestamp) ) {
1923                                 struct frame *next_frame;
1924                                 u32 begin_ts, ts_cyc, ts_off;
1925
1926                                 *(f->mid_frame_timestamp) = 0;
1927
1928                                 begin_ts = le32_to_cpu(*(f->frame_begin_timestamp));
1929
1930                                 irq_printk("  MIDDLE - first packet was sent at cycle %4u (%2u), assigned timestamp was (%2u) %4u\n",
1931                                            begin_ts & 0x1FFF, begin_ts & 0xF,
1932                                            f->assigned_timestamp >> 12, f->assigned_timestamp & 0xFFF);
1933
1934                                 /* prepare next frame and assign timestamp */
1935                                 next_frame = video->frames[ (frame+1) % video->n_frames ];
1936
1937                                 if (next_frame->state == FRAME_READY) {
1938                                         irq_printk("  MIDDLE - next frame is ready, good\n");
1939                                 } else {
1940                                         debug_printk("dv1394: Underflow! At least one frame has been dropped.\n");
1941                                         next_frame = f;
1942                                 }
1943
1944                                 /* set the timestamp to the timestamp of the last frame sent,
1945                                    plus the length of the last frame sent, plus the syt latency */
1946                                 ts_cyc = begin_ts & 0xF;
1947                                 /* advance one frame, plus syt latency (typically 2-3) */
1948                                 ts_cyc += f->n_packets + video->syt_offset ;
1949
1950                                 ts_off = 0;
1951
1952                                 ts_cyc += ts_off/3072;
1953                                 ts_off %= 3072;
1954
1955                                 next_frame->assigned_timestamp = ((ts_cyc&0xF) << 12) + ts_off;
1956                                 if (next_frame->cip_syt1) {
1957                                         next_frame->cip_syt1->b[6] = next_frame->assigned_timestamp >> 8;
1958                                         next_frame->cip_syt1->b[7] = next_frame->assigned_timestamp & 0xFF;
1959                                 }
1960                                 if (next_frame->cip_syt2) {
1961                                         next_frame->cip_syt2->b[6] = next_frame->assigned_timestamp >> 8;
1962                                         next_frame->cip_syt2->b[7] = next_frame->assigned_timestamp & 0xFF;
1963                                 }
1964
1965                         }
1966
1967                         /* see if the frame looped */
1968                         if ( *(f->frame_end_timestamp) ) {
1969
1970                                 *(f->frame_end_timestamp) = 0;
1971
1972                                 debug_printk("  END - the frame looped at least once\n");
1973
1974                                 video->dropped_frames++;
1975                         }
1976
1977                 } /* for (each frame) */
1978         }
1979
1980         if (wake) {
1981                 kill_fasync(&video->fasync, SIGIO, POLL_OUT);
1982
1983                 /* wake readers/writers/ioctl'ers */
1984                 wake_up_interruptible(&video->waitq);
1985         }
1986
1987 out:
1988         spin_unlock(&video->spinlock);
1989 }
1990
1991 static void ir_tasklet_func(unsigned long data)
1992 {
1993         int wake = 0;
1994         struct video_card *video = (struct video_card*) data;
1995
1996         spin_lock(&video->spinlock);
1997
1998         if (!video->dma_running)
1999                 goto out;
2000
2001         if ( (video->ohci_ir_ctx != -1) &&
2002             (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) ) {
2003
2004                 int sof=0; /* start-of-frame flag */
2005                 struct frame *f;
2006                 u16 packet_length, packet_time;
2007                 int i, dbc=0;
2008                 struct DMA_descriptor_block *block = NULL;
2009                 u16 xferstatus;
2010
2011                 int next_i, prev_i;
2012                 struct DMA_descriptor_block *next = NULL;
2013                 dma_addr_t next_dma = 0;
2014                 struct DMA_descriptor_block *prev = NULL;
2015
2016                 /* loop over all descriptors in all frames */
2017                 for (i = 0; i < video->n_frames*MAX_PACKETS; i++) {
2018                         struct packet *p = dma_region_i(&video->packet_buf, struct packet, video->current_packet);
2019
2020                         /* make sure we are seeing the latest changes to p */
2021                         dma_region_sync_for_cpu(&video->packet_buf,
2022                                                 (unsigned long) p - (unsigned long) video->packet_buf.kvirt,
2023                                                 sizeof(struct packet));
2024
2025                         packet_length = le16_to_cpu(p->data_length);
2026                         packet_time   = le16_to_cpu(p->timestamp);
2027
2028                         irq_printk("received packet %02d, timestamp=%04x, length=%04x, sof=%02x%02x\n", video->current_packet,
2029                                    packet_time, packet_length,
2030                                    p->data[0], p->data[1]);
2031
2032                         /* get the descriptor based on packet_buffer cursor */
2033                         f = video->frames[video->current_packet / MAX_PACKETS];
2034                         block = &(f->descriptor_pool[video->current_packet % MAX_PACKETS]);
2035                         xferstatus = le32_to_cpu(block->u.in.il.q[3]) >> 16;
2036                         xferstatus &= 0x1F;
2037                         irq_printk("ir_tasklet_func: xferStatus/resCount [%d] = 0x%08x\n", i, le32_to_cpu(block->u.in.il.q[3]) );
2038
2039                         /* get the current frame */
2040                         f = video->frames[video->active_frame];
2041
2042                         /* exclude empty packet */
2043                         if (packet_length > 8 && xferstatus == 0x11) {
2044                                 /* check for start of frame */
2045                                 /* DRD> Changed to check section type ([0]>>5==0)
2046                                    and dif sequence ([1]>>4==0) */
2047                                 sof = ( (p->data[0] >> 5) == 0 && (p->data[1] >> 4) == 0);
2048
2049                                 dbc = (int) (p->cip_h1 >> 24);
2050                                 if ( video->continuity_counter != -1 && dbc > ((video->continuity_counter + 1) % 256) )
2051                                 {
2052                                         printk(KERN_WARNING "dv1394: discontinuity detected, dropping all frames\n" );
2053                                         video->dropped_frames += video->n_clear_frames + 1;
2054                                         video->first_frame = 0;
2055                                         video->n_clear_frames = 0;
2056                                         video->first_clear_frame = -1;
2057                                 }
2058                                 video->continuity_counter = dbc;
2059
2060                                 if (!video->first_frame) {
2061                                         if (sof) {
2062                                                 video->first_frame = 1;
2063                                         }
2064
2065                                 } else if (sof) {
2066                                         /* close current frame */
2067                                         frame_reset(f);  /* f->state = STATE_CLEAR */
2068                                         video->n_clear_frames++;
2069                                         if (video->n_clear_frames > video->n_frames) {
2070                                                 video->dropped_frames++;
2071                                                 printk(KERN_WARNING "dv1394: dropped a frame during reception\n" );
2072                                                 video->n_clear_frames = video->n_frames-1;
2073                                                 video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
2074                                         }
2075                                         if (video->first_clear_frame == -1)
2076                                                 video->first_clear_frame = video->active_frame;
2077
2078                                         /* get the next frame */
2079                                         video->active_frame = (video->active_frame + 1) % video->n_frames;
2080                                         f = video->frames[video->active_frame];
2081                                         irq_printk("   frame received, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n",
2082                                                    video->active_frame, video->n_clear_frames, video->first_clear_frame);
2083                                 }
2084                                 if (video->first_frame) {
2085                                         if (sof) {
2086                                                 /* open next frame */
2087                                                 f->state = FRAME_READY;
2088                                         }
2089
2090                                         /* copy to buffer */
2091                                         if (f->n_packets > (video->frame_size / 480)) {
2092                                                 printk(KERN_ERR "frame buffer overflow during receive\n");
2093                                         }
2094
2095                                         frame_put_packet(f, p);
2096
2097                                 } /* first_frame */
2098                         }
2099
2100                         /* stop, end of ready packets */
2101                         else if (xferstatus == 0) {
2102                                 break;
2103                         }
2104
2105                         /* reset xferStatus & resCount */
2106                         block->u.in.il.q[3] = cpu_to_le32(512);
2107
2108                         /* terminate dma chain at this (next) packet */
2109                         next_i = video->current_packet;
2110                         f = video->frames[next_i / MAX_PACKETS];
2111                         next = &(f->descriptor_pool[next_i % MAX_PACKETS]);
2112                         next_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
2113                         next->u.in.il.q[0] |= 3 << 20; /* enable interrupt */
2114                         next->u.in.il.q[2] = 0; /* disable branch */
2115
2116                         /* link previous to next */
2117                         prev_i = (next_i == 0) ? (MAX_PACKETS * video->n_frames - 1) : (next_i - 1);
2118                         f = video->frames[prev_i / MAX_PACKETS];
2119                         prev = &(f->descriptor_pool[prev_i % MAX_PACKETS]);
2120                         if (prev_i % (MAX_PACKETS/2)) {
2121                                 prev->u.in.il.q[0] &= ~(3 << 20); /* no interrupt */
2122                         } else {
2123                                 prev->u.in.il.q[0] |= 3 << 20; /* enable interrupt */
2124                         }
2125                         prev->u.in.il.q[2] = cpu_to_le32(next_dma | 1); /* set Z=1 */
2126                         wmb();
2127
2128                         /* wake up DMA in case it fell asleep */
2129                         reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
2130
2131                         /* advance packet_buffer cursor */
2132                         video->current_packet = (video->current_packet + 1) % (MAX_PACKETS * video->n_frames);
2133
2134                 } /* for all packets */
2135
2136                 wake = 1; /* why the hell not? */
2137
2138         } /* receive interrupt */
2139
2140         if (wake) {
2141                 kill_fasync(&video->fasync, SIGIO, POLL_IN);
2142
2143                 /* wake readers/writers/ioctl'ers */
2144                 wake_up_interruptible(&video->waitq);
2145         }
2146
2147 out:
2148         spin_unlock(&video->spinlock);
2149 }
2150
2151 static struct cdev dv1394_cdev;
2152 static const struct file_operations dv1394_fops=
2153 {
2154         .owner =        THIS_MODULE,
2155         .poll =         dv1394_poll,
2156         .unlocked_ioctl = dv1394_ioctl,
2157 #ifdef CONFIG_COMPAT
2158         .compat_ioctl = dv1394_compat_ioctl,
2159 #endif
2160         .mmap =         dv1394_mmap,
2161         .open =         dv1394_open,
2162         .write =        dv1394_write,
2163         .read =         dv1394_read,
2164         .release =      dv1394_release,
2165         .fasync =       dv1394_fasync,
2166 };
2167
2168
2169 /*** HOTPLUG STUFF **********************************************************/
2170 /*
2171  * Export information about protocols/devices supported by this driver.
2172  */
2173 #ifdef MODULE
2174 static struct ieee1394_device_id dv1394_id_table[] = {
2175         {
2176                 .match_flags    = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
2177                 .specifier_id   = AVC_UNIT_SPEC_ID_ENTRY & 0xffffff,
2178                 .version        = AVC_SW_VERSION_ENTRY & 0xffffff
2179         },
2180         { }
2181 };
2182
2183 MODULE_DEVICE_TABLE(ieee1394, dv1394_id_table);
2184 #endif /* MODULE */
2185
2186 static struct hpsb_protocol_driver dv1394_driver = {
2187         .name = "dv1394",
2188 };
2189
2190
2191 /*** IEEE1394 HPSB CALLBACKS ***********************************************/
2192
2193 static int dv1394_init(struct ti_ohci *ohci, enum pal_or_ntsc format, enum modes mode)
2194 {
2195         struct video_card *video;
2196         unsigned long flags;
2197         int i;
2198
2199         video = kzalloc(sizeof(*video), GFP_KERNEL);
2200         if (!video) {
2201                 printk(KERN_ERR "dv1394: cannot allocate video_card\n");
2202                 return -1;
2203         }
2204
2205         video->ohci = ohci;
2206         /* lower 2 bits of id indicate which of four "plugs"
2207            per host */
2208         video->id = ohci->host->id << 2;
2209         if (format == DV1394_NTSC)
2210                 video->id |= mode;
2211         else
2212                 video->id |= 2 + mode;
2213
2214         video->ohci_it_ctx = -1;
2215         video->ohci_ir_ctx = -1;
2216
2217         video->ohci_IsoXmitContextControlSet = 0;
2218         video->ohci_IsoXmitContextControlClear = 0;
2219         video->ohci_IsoXmitCommandPtr = 0;
2220
2221         video->ohci_IsoRcvContextControlSet = 0;
2222         video->ohci_IsoRcvContextControlClear = 0;
2223         video->ohci_IsoRcvCommandPtr = 0;
2224         video->ohci_IsoRcvContextMatch = 0;
2225
2226         video->n_frames = 0; /* flag that video is not initialized */
2227         video->channel = 63; /* default to broadcast channel */
2228         video->active_frame = -1;
2229
2230         /* initialize the following */
2231         video->pal_or_ntsc = format;
2232         video->cip_n = 0; /* 0 = use builtin default */
2233         video->cip_d = 0;
2234         video->syt_offset = 0;
2235         video->mode = mode;
2236
2237         for (i = 0; i < DV1394_MAX_FRAMES; i++)
2238                 video->frames[i] = NULL;
2239
2240         dma_region_init(&video->dv_buf);
2241         video->dv_buf_size = 0;
2242         dma_region_init(&video->packet_buf);
2243         video->packet_buf_size = 0;
2244
2245         clear_bit(0, &video->open);
2246         spin_lock_init(&video->spinlock);
2247         video->dma_running = 0;
2248         mutex_init(&video->mtx);
2249         init_waitqueue_head(&video->waitq);
2250         video->fasync = NULL;
2251
2252         spin_lock_irqsave(&dv1394_cards_lock, flags);
2253         INIT_LIST_HEAD(&video->list);
2254         list_add_tail(&video->list, &dv1394_cards);
2255         spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2256
2257         debug_printk("dv1394: dv1394_init() OK on ID %d\n", video->id);
2258         return 0;
2259 }
2260
2261 static void dv1394_remove_host(struct hpsb_host *host)
2262 {
2263         struct video_card *video, *tmp_video;
2264         unsigned long flags;
2265         int found_ohci_card = 0;
2266
2267         do {
2268                 video = NULL;
2269                 spin_lock_irqsave(&dv1394_cards_lock, flags);
2270                 list_for_each_entry(tmp_video, &dv1394_cards, list) {
2271                         if ((tmp_video->id >> 2) == host->id) {
2272                                 list_del(&tmp_video->list);
2273                                 video = tmp_video;
2274                                 found_ohci_card = 1;
2275                                 break;
2276                         }
2277                 }
2278                 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2279
2280                 if (video) {
2281                         do_dv1394_shutdown(video, 1);
2282                         kfree(video);
2283                 }
2284         } while (video);
2285
2286         if (found_ohci_card)
2287                 device_destroy(hpsb_protocol_class, MKDEV(IEEE1394_MAJOR,
2288                            IEEE1394_MINOR_BLOCK_DV1394 * 16 + (host->id << 2)));
2289 }
2290
2291 static void dv1394_add_host(struct hpsb_host *host)
2292 {
2293         struct ti_ohci *ohci;
2294         int id = host->id;
2295
2296         /* We only work with the OHCI-1394 driver */
2297         if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
2298                 return;
2299
2300         ohci = (struct ti_ohci *)host->hostdata;
2301
2302         device_create(hpsb_protocol_class, NULL,
2303                       MKDEV(IEEE1394_MAJOR,
2304                             IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2)),
2305                       NULL, "dv1394-%d", id);
2306
2307         dv1394_init(ohci, DV1394_NTSC, MODE_RECEIVE);
2308         dv1394_init(ohci, DV1394_NTSC, MODE_TRANSMIT);
2309         dv1394_init(ohci, DV1394_PAL, MODE_RECEIVE);
2310         dv1394_init(ohci, DV1394_PAL, MODE_TRANSMIT);
2311 }
2312
2313
2314 /* Bus reset handler. In the event of a bus reset, we may need to
2315    re-start the DMA contexts - otherwise the user program would
2316    end up waiting forever.
2317 */
2318
2319 static void dv1394_host_reset(struct hpsb_host *host)
2320 {
2321         struct ti_ohci *ohci;
2322         struct video_card *video = NULL, *tmp_vid;
2323         unsigned long flags;
2324
2325         /* We only work with the OHCI-1394 driver */
2326         if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
2327                 return;
2328
2329         ohci = (struct ti_ohci *)host->hostdata;
2330
2331
2332         /* find the corresponding video_cards */
2333         spin_lock_irqsave(&dv1394_cards_lock, flags);
2334         list_for_each_entry(tmp_vid, &dv1394_cards, list) {
2335                 if ((tmp_vid->id >> 2) == host->id) {
2336                         video = tmp_vid;
2337                         break;
2338                 }
2339         }
2340         spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2341
2342         if (!video)
2343                 return;
2344
2345
2346         spin_lock_irqsave(&video->spinlock, flags);
2347
2348         if (!video->dma_running)
2349                 goto out;
2350
2351         /* check IT context */
2352         if (video->ohci_it_ctx != -1) {
2353                 u32 ctx;
2354
2355                 ctx = reg_read(video->ohci, video->ohci_IsoXmitContextControlSet);
2356
2357                 /* if (RUN but not ACTIVE) */
2358                 if ( (ctx & (1<<15)) &&
2359                     !(ctx & (1<<10)) ) {
2360
2361                         debug_printk("dv1394: IT context stopped due to bus reset; waking it up\n");
2362
2363                         /* to be safe, assume a frame has been dropped. User-space programs
2364                            should handle this condition like an underflow. */
2365                         video->dropped_frames++;
2366
2367                         /* for some reason you must clear, then re-set the RUN bit to restart DMA */
2368
2369                         /* clear RUN */
2370                         reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15));
2371                         flush_pci_write(video->ohci);
2372
2373                         /* set RUN */
2374                         reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 15));
2375                         flush_pci_write(video->ohci);
2376
2377                         /* set the WAKE bit (just in case; this isn't strictly necessary) */
2378                         reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 12));
2379                         flush_pci_write(video->ohci);
2380
2381                         irq_printk("dv1394: AFTER IT restart ctx 0x%08x ptr 0x%08x\n",
2382                                    reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
2383                                    reg_read(video->ohci, video->ohci_IsoXmitCommandPtr));
2384                 }
2385         }
2386
2387         /* check IR context */
2388         if (video->ohci_ir_ctx != -1) {
2389                 u32 ctx;
2390
2391                 ctx = reg_read(video->ohci, video->ohci_IsoRcvContextControlSet);
2392
2393                 /* if (RUN but not ACTIVE) */
2394                 if ( (ctx & (1<<15)) &&
2395                     !(ctx & (1<<10)) ) {
2396
2397                         debug_printk("dv1394: IR context stopped due to bus reset; waking it up\n");
2398
2399                         /* to be safe, assume a frame has been dropped. User-space programs
2400                            should handle this condition like an overflow. */
2401                         video->dropped_frames++;
2402
2403                         /* for some reason you must clear, then re-set the RUN bit to restart DMA */
2404                         /* XXX this doesn't work for me, I can't get IR DMA to restart :[ */
2405
2406                         /* clear RUN */
2407                         reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15));
2408                         flush_pci_write(video->ohci);
2409
2410                         /* set RUN */
2411                         reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 15));
2412                         flush_pci_write(video->ohci);
2413
2414                         /* set the WAKE bit (just in case; this isn't strictly necessary) */
2415                         reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
2416                         flush_pci_write(video->ohci);
2417
2418                         irq_printk("dv1394: AFTER IR restart ctx 0x%08x ptr 0x%08x\n",
2419                                    reg_read(video->ohci, video->ohci_IsoRcvContextControlSet),
2420                                    reg_read(video->ohci, video->ohci_IsoRcvCommandPtr));
2421                 }
2422         }
2423
2424 out:
2425         spin_unlock_irqrestore(&video->spinlock, flags);
2426
2427         /* wake readers/writers/ioctl'ers */
2428         wake_up_interruptible(&video->waitq);
2429 }
2430
2431 static struct hpsb_highlevel dv1394_highlevel = {
2432         .name =         "dv1394",
2433         .add_host =     dv1394_add_host,
2434         .remove_host =  dv1394_remove_host,
2435         .host_reset =   dv1394_host_reset,
2436 };
2437
2438 #ifdef CONFIG_COMPAT
2439
2440 #define DV1394_IOC32_INIT       _IOW('#', 0x06, struct dv1394_init32)
2441 #define DV1394_IOC32_GET_STATUS _IOR('#', 0x0c, struct dv1394_status32)
2442
2443 struct dv1394_init32 {
2444         u32 api_version;
2445         u32 channel;
2446         u32 n_frames;
2447         u32 format;
2448         u32 cip_n;
2449         u32 cip_d;
2450         u32 syt_offset;
2451 };
2452
2453 struct dv1394_status32 {
2454         struct dv1394_init32 init;
2455         s32 active_frame;
2456         u32 first_clear_frame;
2457         u32 n_clear_frames;
2458         u32 dropped_frames;
2459 };
2460
2461 /* RED-PEN: this should use compat_alloc_userspace instead */
2462
2463 static int handle_dv1394_init(struct file *file, unsigned int cmd, unsigned long arg)
2464 {
2465         struct dv1394_init32 dv32;
2466         struct dv1394_init dv;
2467         mm_segment_t old_fs;
2468         int ret;
2469
2470         if (file->f_op->unlocked_ioctl != dv1394_ioctl)
2471                 return -EFAULT;
2472
2473         if (copy_from_user(&dv32, (void __user *)arg, sizeof(dv32)))
2474                 return -EFAULT;
2475
2476         dv.api_version = dv32.api_version;
2477         dv.channel = dv32.channel;
2478         dv.n_frames = dv32.n_frames;
2479         dv.format = dv32.format;
2480         dv.cip_n = (unsigned long)dv32.cip_n;
2481         dv.cip_d = (unsigned long)dv32.cip_d;
2482         dv.syt_offset = dv32.syt_offset;
2483
2484         old_fs = get_fs();
2485         set_fs(KERNEL_DS);
2486         ret = dv1394_ioctl(file, DV1394_IOC_INIT, (unsigned long)&dv);
2487         set_fs(old_fs);
2488
2489         return ret;
2490 }
2491
2492 static int handle_dv1394_get_status(struct file *file, unsigned int cmd, unsigned long arg)
2493 {
2494         struct dv1394_status32 dv32;
2495         struct dv1394_status dv;
2496         mm_segment_t old_fs;
2497         int ret;
2498
2499         if (file->f_op->unlocked_ioctl != dv1394_ioctl)
2500                 return -EFAULT;
2501
2502         old_fs = get_fs();
2503         set_fs(KERNEL_DS);
2504         ret = dv1394_ioctl(file, DV1394_IOC_GET_STATUS, (unsigned long)&dv);
2505         set_fs(old_fs);
2506
2507         if (!ret) {
2508                 dv32.init.api_version = dv.init.api_version;
2509                 dv32.init.channel = dv.init.channel;
2510                 dv32.init.n_frames = dv.init.n_frames;
2511                 dv32.init.format = dv.init.format;
2512                 dv32.init.cip_n = (u32)dv.init.cip_n;
2513                 dv32.init.cip_d = (u32)dv.init.cip_d;
2514                 dv32.init.syt_offset = dv.init.syt_offset;
2515                 dv32.active_frame = dv.active_frame;
2516                 dv32.first_clear_frame = dv.first_clear_frame;
2517                 dv32.n_clear_frames = dv.n_clear_frames;
2518                 dv32.dropped_frames = dv.dropped_frames;
2519
2520                 if (copy_to_user((struct dv1394_status32 __user *)arg, &dv32, sizeof(dv32)))
2521                         ret = -EFAULT;
2522         }
2523
2524         return ret;
2525 }
2526
2527
2528
2529 static long dv1394_compat_ioctl(struct file *file, unsigned int cmd,
2530                                unsigned long arg)
2531 {
2532         switch (cmd) {
2533         case DV1394_IOC_SHUTDOWN:
2534         case DV1394_IOC_SUBMIT_FRAMES:
2535         case DV1394_IOC_WAIT_FRAMES:
2536         case DV1394_IOC_RECEIVE_FRAMES:
2537         case DV1394_IOC_START_RECEIVE:
2538                 return dv1394_ioctl(file, cmd, arg);
2539
2540         case DV1394_IOC32_INIT:
2541                 return handle_dv1394_init(file, cmd, arg);
2542         case DV1394_IOC32_GET_STATUS:
2543                 return handle_dv1394_get_status(file, cmd, arg);
2544         default:
2545                 return -ENOIOCTLCMD;
2546         }
2547 }
2548
2549 #endif /* CONFIG_COMPAT */
2550
2551
2552 /*** KERNEL MODULE HANDLERS ************************************************/
2553
2554 MODULE_AUTHOR("Dan Maas <dmaas@dcine.com>, Dan Dennedy <dan@dennedy.org>");
2555 MODULE_DESCRIPTION("driver for DV input/output on OHCI board");
2556 MODULE_SUPPORTED_DEVICE("dv1394");
2557 MODULE_LICENSE("GPL");
2558
2559 static void __exit dv1394_exit_module(void)
2560 {
2561         hpsb_unregister_protocol(&dv1394_driver);
2562         hpsb_unregister_highlevel(&dv1394_highlevel);
2563         cdev_del(&dv1394_cdev);
2564 }
2565
2566 static int __init dv1394_init_module(void)
2567 {
2568         int ret;
2569
2570         printk(KERN_WARNING
2571                "NOTE: The dv1394 driver is unsupported and may be removed in a "
2572                "future Linux release. Use raw1394 instead.\n");
2573
2574         cdev_init(&dv1394_cdev, &dv1394_fops);
2575         dv1394_cdev.owner = THIS_MODULE;
2576         ret = cdev_add(&dv1394_cdev, IEEE1394_DV1394_DEV, 16);
2577         if (ret) {
2578                 printk(KERN_ERR "dv1394: unable to register character device\n");
2579                 return ret;
2580         }
2581
2582         hpsb_register_highlevel(&dv1394_highlevel);
2583
2584         ret = hpsb_register_protocol(&dv1394_driver);
2585         if (ret) {
2586                 printk(KERN_ERR "dv1394: failed to register protocol\n");
2587                 hpsb_unregister_highlevel(&dv1394_highlevel);
2588                 cdev_del(&dv1394_cdev);
2589                 return ret;
2590         }
2591
2592         return 0;
2593 }
2594
2595 module_init(dv1394_init_module);
2596 module_exit(dv1394_exit_module);