Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Stefan Richter | a874844 | 2006-03-28 19:55:41 -0500 | [diff] [blame] | 76 | - character device dispatching |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 97 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | #include <linux/compat.h> |
| 111 | #include <linux/cdev.h> |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | #include "dv1394.h" |
| 114 | #include "dv1394-private.h" |
Stefan Richter | de4394f | 2006-07-03 12:02:29 -0400 | [diff] [blame] | 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" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | #include "ohci1394.h" |
| 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Stefan Richter | 611aa19 | 2006-08-02 18:44:00 +0200 | [diff] [blame] | 139 | #define irq_printk( args... ) do {} while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | #endif |
| 141 | |
| 142 | #if DV1394_DEBUG_LEVEL >= 1 |
| 143 | #define debug_printk( args... ) printk( args) |
| 144 | #else |
Stefan Richter | 611aa19 | 2006-08-02 18:44:00 +0200 | [diff] [blame] | 145 | #define debug_printk( args... ) do {} while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 250 | it should be called WITH the video->mtx taken. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Harvey Harrison | 7d7039d | 2008-12-13 15:20:39 -0800 | [diff] [blame] | 268 | __le32 *branch_address, *last_branch_address = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Harvey Harrison | 7d7039d | 2008-12-13 15:20:39 -0800 | [diff] [blame] | 851 | __le32 *last_branch_address = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Richter | d98562d | 2008-09-11 19:22:53 +0200 | [diff] [blame] | 921 | if (init->channel > 63) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Richter | 8449fc3 | 2008-10-26 12:02:03 +0100 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1290 | mutex_unlock(&video->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jonathan Corbet | 60aa492 | 2009-02-01 14:52:56 -0700 | [diff] [blame] | 1328 | return fasync_helper(fd, file, on, &video->fasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | } |
| 1330 | |
| 1331 | static ssize_t dv1394_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
| 1332 | { |
| 1333 | struct video_card *video = file_to_video_card(file); |
| 1334 | DECLARE_WAITQUEUE(wait, current); |
| 1335 | ssize_t ret; |
| 1336 | size_t cnt; |
| 1337 | unsigned long flags; |
| 1338 | int target_frame; |
| 1339 | |
| 1340 | /* serialize this to prevent multi-threaded mayhem */ |
| 1341 | if (file->f_flags & O_NONBLOCK) { |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1342 | if (!mutex_trylock(&video->mtx)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | return -EAGAIN; |
| 1344 | } else { |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1345 | if (mutex_lock_interruptible(&video->mtx)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | return -ERESTARTSYS; |
| 1347 | } |
| 1348 | |
| 1349 | if ( !video_card_initialized(video) ) { |
| 1350 | ret = do_dv1394_init_default(video); |
| 1351 | if (ret) { |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1352 | mutex_unlock(&video->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | return ret; |
| 1354 | } |
| 1355 | } |
| 1356 | |
| 1357 | ret = 0; |
| 1358 | add_wait_queue(&video->waitq, &wait); |
| 1359 | |
| 1360 | while (count > 0) { |
| 1361 | |
| 1362 | /* must set TASK_INTERRUPTIBLE *before* checking for free |
| 1363 | buffers; otherwise we could miss a wakeup if the interrupt |
| 1364 | fires between the check and the schedule() */ |
| 1365 | |
| 1366 | set_current_state(TASK_INTERRUPTIBLE); |
| 1367 | |
| 1368 | spin_lock_irqsave(&video->spinlock, flags); |
| 1369 | |
| 1370 | target_frame = video->first_clear_frame; |
| 1371 | |
| 1372 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 1373 | |
| 1374 | if (video->frames[target_frame]->state == FRAME_CLEAR) { |
| 1375 | |
| 1376 | /* how much room is left in the target frame buffer */ |
| 1377 | cnt = video->frame_size - (video->write_off - target_frame * video->frame_size); |
| 1378 | |
| 1379 | } else { |
| 1380 | /* buffer is already used */ |
| 1381 | cnt = 0; |
| 1382 | } |
| 1383 | |
| 1384 | if (cnt > count) |
| 1385 | cnt = count; |
| 1386 | |
| 1387 | if (cnt <= 0) { |
| 1388 | /* no room left, gotta wait */ |
| 1389 | if (file->f_flags & O_NONBLOCK) { |
| 1390 | if (!ret) |
| 1391 | ret = -EAGAIN; |
| 1392 | break; |
| 1393 | } |
| 1394 | if (signal_pending(current)) { |
| 1395 | if (!ret) |
| 1396 | ret = -ERESTARTSYS; |
| 1397 | break; |
| 1398 | } |
| 1399 | |
| 1400 | schedule(); |
| 1401 | |
| 1402 | continue; /* start over from 'while(count > 0)...' */ |
| 1403 | } |
| 1404 | |
| 1405 | if (copy_from_user(video->dv_buf.kvirt + video->write_off, buffer, cnt)) { |
| 1406 | if (!ret) |
| 1407 | ret = -EFAULT; |
| 1408 | break; |
| 1409 | } |
| 1410 | |
| 1411 | video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size); |
| 1412 | |
| 1413 | count -= cnt; |
| 1414 | buffer += cnt; |
| 1415 | ret += cnt; |
| 1416 | |
| 1417 | if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames)) |
| 1418 | frame_prepare(video, target_frame); |
| 1419 | } |
| 1420 | |
| 1421 | remove_wait_queue(&video->waitq, &wait); |
| 1422 | set_current_state(TASK_RUNNING); |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1423 | mutex_unlock(&video->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | return ret; |
| 1425 | } |
| 1426 | |
| 1427 | |
| 1428 | static ssize_t dv1394_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) |
| 1429 | { |
| 1430 | struct video_card *video = file_to_video_card(file); |
| 1431 | DECLARE_WAITQUEUE(wait, current); |
| 1432 | ssize_t ret; |
| 1433 | size_t cnt; |
| 1434 | unsigned long flags; |
| 1435 | int target_frame; |
| 1436 | |
| 1437 | /* serialize this to prevent multi-threaded mayhem */ |
| 1438 | if (file->f_flags & O_NONBLOCK) { |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1439 | if (!mutex_trylock(&video->mtx)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | return -EAGAIN; |
| 1441 | } else { |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1442 | if (mutex_lock_interruptible(&video->mtx)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | return -ERESTARTSYS; |
| 1444 | } |
| 1445 | |
| 1446 | if ( !video_card_initialized(video) ) { |
| 1447 | ret = do_dv1394_init_default(video); |
| 1448 | if (ret) { |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1449 | mutex_unlock(&video->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | return ret; |
| 1451 | } |
| 1452 | video->continuity_counter = -1; |
| 1453 | |
| 1454 | receive_packets(video); |
| 1455 | |
| 1456 | start_dma_receive(video); |
| 1457 | } |
| 1458 | |
| 1459 | ret = 0; |
| 1460 | add_wait_queue(&video->waitq, &wait); |
| 1461 | |
| 1462 | while (count > 0) { |
| 1463 | |
| 1464 | /* must set TASK_INTERRUPTIBLE *before* checking for free |
| 1465 | buffers; otherwise we could miss a wakeup if the interrupt |
| 1466 | fires between the check and the schedule() */ |
| 1467 | |
| 1468 | set_current_state(TASK_INTERRUPTIBLE); |
| 1469 | |
| 1470 | spin_lock_irqsave(&video->spinlock, flags); |
| 1471 | |
| 1472 | target_frame = video->first_clear_frame; |
| 1473 | |
| 1474 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 1475 | |
| 1476 | if (target_frame >= 0 && |
| 1477 | video->n_clear_frames > 0 && |
| 1478 | video->frames[target_frame]->state == FRAME_CLEAR) { |
| 1479 | |
| 1480 | /* how much room is left in the target frame buffer */ |
| 1481 | cnt = video->frame_size - (video->write_off - target_frame * video->frame_size); |
| 1482 | |
| 1483 | } else { |
| 1484 | /* buffer is already used */ |
| 1485 | cnt = 0; |
| 1486 | } |
| 1487 | |
| 1488 | if (cnt > count) |
| 1489 | cnt = count; |
| 1490 | |
| 1491 | if (cnt <= 0) { |
| 1492 | /* no room left, gotta wait */ |
| 1493 | if (file->f_flags & O_NONBLOCK) { |
| 1494 | if (!ret) |
| 1495 | ret = -EAGAIN; |
| 1496 | break; |
| 1497 | } |
| 1498 | if (signal_pending(current)) { |
| 1499 | if (!ret) |
| 1500 | ret = -ERESTARTSYS; |
| 1501 | break; |
| 1502 | } |
| 1503 | |
| 1504 | schedule(); |
| 1505 | |
| 1506 | continue; /* start over from 'while(count > 0)...' */ |
| 1507 | } |
| 1508 | |
| 1509 | if (copy_to_user(buffer, video->dv_buf.kvirt + video->write_off, cnt)) { |
| 1510 | if (!ret) |
| 1511 | ret = -EFAULT; |
| 1512 | break; |
| 1513 | } |
| 1514 | |
| 1515 | video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size); |
| 1516 | |
| 1517 | count -= cnt; |
| 1518 | buffer += cnt; |
| 1519 | ret += cnt; |
| 1520 | |
| 1521 | if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames)) { |
| 1522 | spin_lock_irqsave(&video->spinlock, flags); |
| 1523 | video->n_clear_frames--; |
| 1524 | video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames; |
| 1525 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 1526 | } |
| 1527 | } |
| 1528 | |
| 1529 | remove_wait_queue(&video->waitq, &wait); |
| 1530 | set_current_state(TASK_RUNNING); |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1531 | mutex_unlock(&video->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | return ret; |
| 1533 | } |
| 1534 | |
| 1535 | |
| 1536 | /*** DEVICE IOCTL INTERFACE ************************************************/ |
| 1537 | |
| 1538 | static long dv1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 1539 | { |
Stefan Richter | 7b900c1 | 2006-10-20 21:01:58 +0200 | [diff] [blame] | 1540 | struct video_card *video = file_to_video_card(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | unsigned long flags; |
| 1542 | int ret = -EINVAL; |
| 1543 | void __user *argp = (void __user *)arg; |
| 1544 | |
| 1545 | DECLARE_WAITQUEUE(wait, current); |
| 1546 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | /* serialize this to prevent multi-threaded mayhem */ |
| 1548 | if (file->f_flags & O_NONBLOCK) { |
Stefan Richter | 7b900c1 | 2006-10-20 21:01:58 +0200 | [diff] [blame] | 1549 | if (!mutex_trylock(&video->mtx)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | return -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | } else { |
Stefan Richter | 7b900c1 | 2006-10-20 21:01:58 +0200 | [diff] [blame] | 1552 | if (mutex_lock_interruptible(&video->mtx)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | return -ERESTARTSYS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | } |
| 1555 | |
| 1556 | switch(cmd) |
| 1557 | { |
| 1558 | case DV1394_IOC_SUBMIT_FRAMES: { |
| 1559 | unsigned int n_submit; |
| 1560 | |
| 1561 | if ( !video_card_initialized(video) ) { |
| 1562 | ret = do_dv1394_init_default(video); |
| 1563 | if (ret) |
| 1564 | goto out; |
| 1565 | } |
| 1566 | |
| 1567 | n_submit = (unsigned int) arg; |
| 1568 | |
| 1569 | if (n_submit > video->n_frames) { |
| 1570 | ret = -EINVAL; |
| 1571 | goto out; |
| 1572 | } |
| 1573 | |
| 1574 | while (n_submit > 0) { |
| 1575 | |
| 1576 | add_wait_queue(&video->waitq, &wait); |
| 1577 | set_current_state(TASK_INTERRUPTIBLE); |
| 1578 | |
| 1579 | spin_lock_irqsave(&video->spinlock, flags); |
| 1580 | |
| 1581 | /* wait until video->first_clear_frame is really CLEAR */ |
| 1582 | while (video->frames[video->first_clear_frame]->state != FRAME_CLEAR) { |
| 1583 | |
| 1584 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 1585 | |
| 1586 | if (signal_pending(current)) { |
| 1587 | remove_wait_queue(&video->waitq, &wait); |
| 1588 | set_current_state(TASK_RUNNING); |
| 1589 | ret = -EINTR; |
| 1590 | goto out; |
| 1591 | } |
| 1592 | |
| 1593 | schedule(); |
| 1594 | set_current_state(TASK_INTERRUPTIBLE); |
| 1595 | |
| 1596 | spin_lock_irqsave(&video->spinlock, flags); |
| 1597 | } |
| 1598 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 1599 | |
| 1600 | remove_wait_queue(&video->waitq, &wait); |
| 1601 | set_current_state(TASK_RUNNING); |
| 1602 | |
| 1603 | frame_prepare(video, video->first_clear_frame); |
| 1604 | |
| 1605 | n_submit--; |
| 1606 | } |
| 1607 | |
| 1608 | ret = 0; |
| 1609 | break; |
| 1610 | } |
| 1611 | |
| 1612 | case DV1394_IOC_WAIT_FRAMES: { |
| 1613 | unsigned int n_wait; |
| 1614 | |
| 1615 | if ( !video_card_initialized(video) ) { |
| 1616 | ret = -EINVAL; |
| 1617 | goto out; |
| 1618 | } |
| 1619 | |
| 1620 | n_wait = (unsigned int) arg; |
| 1621 | |
| 1622 | /* since we re-run the last frame on underflow, we will |
| 1623 | never actually have n_frames clear frames; at most only |
| 1624 | n_frames - 1 */ |
| 1625 | |
| 1626 | if (n_wait > (video->n_frames-1) ) { |
| 1627 | ret = -EINVAL; |
| 1628 | goto out; |
| 1629 | } |
| 1630 | |
| 1631 | add_wait_queue(&video->waitq, &wait); |
| 1632 | set_current_state(TASK_INTERRUPTIBLE); |
| 1633 | |
| 1634 | spin_lock_irqsave(&video->spinlock, flags); |
| 1635 | |
| 1636 | while (video->n_clear_frames < n_wait) { |
| 1637 | |
| 1638 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 1639 | |
| 1640 | if (signal_pending(current)) { |
| 1641 | remove_wait_queue(&video->waitq, &wait); |
| 1642 | set_current_state(TASK_RUNNING); |
| 1643 | ret = -EINTR; |
| 1644 | goto out; |
| 1645 | } |
| 1646 | |
| 1647 | schedule(); |
| 1648 | set_current_state(TASK_INTERRUPTIBLE); |
| 1649 | |
| 1650 | spin_lock_irqsave(&video->spinlock, flags); |
| 1651 | } |
| 1652 | |
| 1653 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 1654 | |
| 1655 | remove_wait_queue(&video->waitq, &wait); |
| 1656 | set_current_state(TASK_RUNNING); |
| 1657 | ret = 0; |
| 1658 | break; |
| 1659 | } |
| 1660 | |
| 1661 | case DV1394_IOC_RECEIVE_FRAMES: { |
| 1662 | unsigned int n_recv; |
| 1663 | |
| 1664 | if ( !video_card_initialized(video) ) { |
| 1665 | ret = -EINVAL; |
| 1666 | goto out; |
| 1667 | } |
| 1668 | |
| 1669 | n_recv = (unsigned int) arg; |
| 1670 | |
| 1671 | /* at least one frame must be active */ |
| 1672 | if (n_recv > (video->n_frames-1) ) { |
| 1673 | ret = -EINVAL; |
| 1674 | goto out; |
| 1675 | } |
| 1676 | |
| 1677 | spin_lock_irqsave(&video->spinlock, flags); |
| 1678 | |
| 1679 | /* release the clear frames */ |
| 1680 | video->n_clear_frames -= n_recv; |
| 1681 | |
| 1682 | /* advance the clear frame cursor */ |
| 1683 | video->first_clear_frame = (video->first_clear_frame + n_recv) % video->n_frames; |
| 1684 | |
| 1685 | /* reset dropped_frames */ |
| 1686 | video->dropped_frames = 0; |
| 1687 | |
| 1688 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 1689 | |
| 1690 | ret = 0; |
| 1691 | break; |
| 1692 | } |
| 1693 | |
| 1694 | case DV1394_IOC_START_RECEIVE: { |
| 1695 | if ( !video_card_initialized(video) ) { |
| 1696 | ret = do_dv1394_init_default(video); |
| 1697 | if (ret) |
| 1698 | goto out; |
| 1699 | } |
| 1700 | |
| 1701 | video->continuity_counter = -1; |
| 1702 | |
| 1703 | receive_packets(video); |
| 1704 | |
| 1705 | start_dma_receive(video); |
| 1706 | |
| 1707 | ret = 0; |
| 1708 | break; |
| 1709 | } |
| 1710 | |
| 1711 | case DV1394_IOC_INIT: { |
| 1712 | struct dv1394_init init; |
| 1713 | if (!argp) { |
| 1714 | ret = do_dv1394_init_default(video); |
| 1715 | } else { |
| 1716 | if (copy_from_user(&init, argp, sizeof(init))) { |
| 1717 | ret = -EFAULT; |
| 1718 | goto out; |
| 1719 | } |
| 1720 | ret = do_dv1394_init(video, &init); |
| 1721 | } |
| 1722 | break; |
| 1723 | } |
| 1724 | |
| 1725 | case DV1394_IOC_SHUTDOWN: |
| 1726 | do_dv1394_shutdown(video, 0); |
| 1727 | ret = 0; |
| 1728 | break; |
| 1729 | |
| 1730 | |
| 1731 | case DV1394_IOC_GET_STATUS: { |
| 1732 | struct dv1394_status status; |
| 1733 | |
| 1734 | if ( !video_card_initialized(video) ) { |
| 1735 | ret = -EINVAL; |
| 1736 | goto out; |
| 1737 | } |
| 1738 | |
| 1739 | status.init.api_version = DV1394_API_VERSION; |
| 1740 | status.init.channel = video->channel; |
| 1741 | status.init.n_frames = video->n_frames; |
| 1742 | status.init.format = video->pal_or_ntsc; |
| 1743 | status.init.cip_n = video->cip_n; |
| 1744 | status.init.cip_d = video->cip_d; |
| 1745 | status.init.syt_offset = video->syt_offset; |
| 1746 | |
| 1747 | status.first_clear_frame = video->first_clear_frame; |
| 1748 | |
| 1749 | /* the rest of the fields need to be locked against the interrupt */ |
| 1750 | spin_lock_irqsave(&video->spinlock, flags); |
| 1751 | |
| 1752 | status.active_frame = video->active_frame; |
| 1753 | status.n_clear_frames = video->n_clear_frames; |
| 1754 | |
| 1755 | status.dropped_frames = video->dropped_frames; |
| 1756 | |
| 1757 | /* reset dropped_frames */ |
| 1758 | video->dropped_frames = 0; |
| 1759 | |
| 1760 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 1761 | |
| 1762 | if (copy_to_user(argp, &status, sizeof(status))) { |
| 1763 | ret = -EFAULT; |
| 1764 | goto out; |
| 1765 | } |
| 1766 | |
| 1767 | ret = 0; |
| 1768 | break; |
| 1769 | } |
| 1770 | |
| 1771 | default: |
| 1772 | break; |
| 1773 | } |
| 1774 | |
| 1775 | out: |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 1776 | mutex_unlock(&video->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | return ret; |
| 1778 | } |
| 1779 | |
| 1780 | /*** DEVICE FILE INTERFACE CONTINUED ***************************************/ |
| 1781 | |
| 1782 | static int dv1394_open(struct inode *inode, struct file *file) |
| 1783 | { |
| 1784 | struct video_card *video = NULL; |
| 1785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | if (file->private_data) { |
| 1787 | video = (struct video_card*) file->private_data; |
| 1788 | |
| 1789 | } else { |
| 1790 | /* look up the card by ID */ |
| 1791 | unsigned long flags; |
Theodore Ts'o | 9fd5746 | 2009-05-21 16:01:00 -0400 | [diff] [blame^] | 1792 | int idx = ieee1394_file_to_instance(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | |
| 1794 | spin_lock_irqsave(&dv1394_cards_lock, flags); |
| 1795 | if (!list_empty(&dv1394_cards)) { |
| 1796 | struct video_card *p; |
| 1797 | list_for_each_entry(p, &dv1394_cards, list) { |
Theodore Ts'o | 9fd5746 | 2009-05-21 16:01:00 -0400 | [diff] [blame^] | 1798 | if ((p->id) == idx) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | video = p; |
| 1800 | break; |
| 1801 | } |
| 1802 | } |
| 1803 | } |
| 1804 | spin_unlock_irqrestore(&dv1394_cards_lock, flags); |
| 1805 | |
| 1806 | if (!video) { |
Theodore Ts'o | 9fd5746 | 2009-05-21 16:01:00 -0400 | [diff] [blame^] | 1807 | debug_printk("dv1394: OHCI card %d not found", idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | return -ENODEV; |
| 1809 | } |
| 1810 | |
| 1811 | file->private_data = (void*) video; |
| 1812 | } |
| 1813 | |
| 1814 | #ifndef DV1394_ALLOW_MORE_THAN_ONE_OPEN |
| 1815 | |
| 1816 | if ( test_and_set_bit(0, &video->open) ) { |
| 1817 | /* video is already open by someone else */ |
| 1818 | return -EBUSY; |
| 1819 | } |
| 1820 | |
| 1821 | #endif |
| 1822 | |
Stefan Richter | 8643153 | 2009-02-03 17:54:31 +0100 | [diff] [blame] | 1823 | printk(KERN_INFO "%s: NOTE, the dv1394 interface is unsupported " |
| 1824 | "and will not be available in the new firewire driver stack. " |
| 1825 | "Try libraw1394 based programs instead.\n", current->comm); |
| 1826 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | return 0; |
| 1828 | } |
| 1829 | |
| 1830 | |
| 1831 | static int dv1394_release(struct inode *inode, struct file *file) |
| 1832 | { |
| 1833 | struct video_card *video = file_to_video_card(file); |
| 1834 | |
| 1835 | /* OK to free the DMA buffer, no more mappings can exist */ |
| 1836 | do_dv1394_shutdown(video, 1); |
| 1837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | /* give someone else a turn */ |
| 1839 | clear_bit(0, &video->open); |
| 1840 | |
| 1841 | return 0; |
| 1842 | } |
| 1843 | |
| 1844 | |
| 1845 | /*** DEVICE DRIVER HANDLERS ************************************************/ |
| 1846 | |
| 1847 | static void it_tasklet_func(unsigned long data) |
| 1848 | { |
| 1849 | int wake = 0; |
| 1850 | struct video_card *video = (struct video_card*) data; |
| 1851 | |
| 1852 | spin_lock(&video->spinlock); |
| 1853 | |
| 1854 | if (!video->dma_running) |
| 1855 | goto out; |
| 1856 | |
| 1857 | irq_printk("ContextControl = %08x, CommandPtr = %08x\n", |
| 1858 | reg_read(video->ohci, video->ohci_IsoXmitContextControlSet), |
| 1859 | reg_read(video->ohci, video->ohci_IsoXmitCommandPtr) |
| 1860 | ); |
| 1861 | |
| 1862 | |
| 1863 | if ( (video->ohci_it_ctx != -1) && |
| 1864 | (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) { |
| 1865 | |
| 1866 | struct frame *f; |
| 1867 | unsigned int frame, i; |
| 1868 | |
| 1869 | |
| 1870 | if (video->active_frame == -1) |
| 1871 | frame = 0; |
| 1872 | else |
| 1873 | frame = video->active_frame; |
| 1874 | |
| 1875 | /* check all the DMA-able frames */ |
| 1876 | for (i = 0; i < video->n_frames; i++, frame = (frame+1) % video->n_frames) { |
| 1877 | |
| 1878 | irq_printk("IRQ checking frame %d...", frame); |
| 1879 | f = video->frames[frame]; |
| 1880 | if (f->state != FRAME_READY) { |
| 1881 | irq_printk("clear, skipping\n"); |
| 1882 | /* we don't own this frame */ |
| 1883 | continue; |
| 1884 | } |
| 1885 | |
| 1886 | irq_printk("DMA\n"); |
| 1887 | |
| 1888 | /* check the frame begin semaphore to see if we can free the previous frame */ |
| 1889 | if ( *(f->frame_begin_timestamp) ) { |
| 1890 | int prev_frame; |
| 1891 | struct frame *prev_f; |
| 1892 | |
| 1893 | |
| 1894 | |
| 1895 | /* don't reset, need this later *(f->frame_begin_timestamp) = 0; */ |
| 1896 | irq_printk(" BEGIN\n"); |
| 1897 | |
| 1898 | prev_frame = frame - 1; |
| 1899 | if (prev_frame == -1) |
| 1900 | prev_frame += video->n_frames; |
| 1901 | prev_f = video->frames[prev_frame]; |
| 1902 | |
| 1903 | /* make sure we can actually garbage collect |
| 1904 | this frame */ |
| 1905 | if ( (prev_f->state == FRAME_READY) && |
| 1906 | prev_f->done && (!f->done) ) |
| 1907 | { |
| 1908 | frame_reset(prev_f); |
| 1909 | video->n_clear_frames++; |
| 1910 | wake = 1; |
| 1911 | video->active_frame = frame; |
| 1912 | |
| 1913 | irq_printk(" BEGIN - freeing previous frame %d, new active frame is %d\n", prev_frame, frame); |
| 1914 | } else { |
| 1915 | irq_printk(" BEGIN - can't free yet\n"); |
| 1916 | } |
| 1917 | |
| 1918 | f->done = 1; |
| 1919 | } |
| 1920 | |
| 1921 | |
| 1922 | /* see if we need to set the timestamp for the next frame */ |
| 1923 | if ( *(f->mid_frame_timestamp) ) { |
| 1924 | struct frame *next_frame; |
| 1925 | u32 begin_ts, ts_cyc, ts_off; |
| 1926 | |
| 1927 | *(f->mid_frame_timestamp) = 0; |
| 1928 | |
| 1929 | begin_ts = le32_to_cpu(*(f->frame_begin_timestamp)); |
| 1930 | |
| 1931 | irq_printk(" MIDDLE - first packet was sent at cycle %4u (%2u), assigned timestamp was (%2u) %4u\n", |
| 1932 | begin_ts & 0x1FFF, begin_ts & 0xF, |
| 1933 | f->assigned_timestamp >> 12, f->assigned_timestamp & 0xFFF); |
| 1934 | |
| 1935 | /* prepare next frame and assign timestamp */ |
| 1936 | next_frame = video->frames[ (frame+1) % video->n_frames ]; |
| 1937 | |
| 1938 | if (next_frame->state == FRAME_READY) { |
| 1939 | irq_printk(" MIDDLE - next frame is ready, good\n"); |
| 1940 | } else { |
| 1941 | debug_printk("dv1394: Underflow! At least one frame has been dropped.\n"); |
| 1942 | next_frame = f; |
| 1943 | } |
| 1944 | |
| 1945 | /* set the timestamp to the timestamp of the last frame sent, |
| 1946 | plus the length of the last frame sent, plus the syt latency */ |
| 1947 | ts_cyc = begin_ts & 0xF; |
| 1948 | /* advance one frame, plus syt latency (typically 2-3) */ |
| 1949 | ts_cyc += f->n_packets + video->syt_offset ; |
| 1950 | |
| 1951 | ts_off = 0; |
| 1952 | |
| 1953 | ts_cyc += ts_off/3072; |
| 1954 | ts_off %= 3072; |
| 1955 | |
| 1956 | next_frame->assigned_timestamp = ((ts_cyc&0xF) << 12) + ts_off; |
| 1957 | if (next_frame->cip_syt1) { |
| 1958 | next_frame->cip_syt1->b[6] = next_frame->assigned_timestamp >> 8; |
| 1959 | next_frame->cip_syt1->b[7] = next_frame->assigned_timestamp & 0xFF; |
| 1960 | } |
| 1961 | if (next_frame->cip_syt2) { |
| 1962 | next_frame->cip_syt2->b[6] = next_frame->assigned_timestamp >> 8; |
| 1963 | next_frame->cip_syt2->b[7] = next_frame->assigned_timestamp & 0xFF; |
| 1964 | } |
| 1965 | |
| 1966 | } |
| 1967 | |
| 1968 | /* see if the frame looped */ |
| 1969 | if ( *(f->frame_end_timestamp) ) { |
| 1970 | |
| 1971 | *(f->frame_end_timestamp) = 0; |
| 1972 | |
| 1973 | debug_printk(" END - the frame looped at least once\n"); |
| 1974 | |
| 1975 | video->dropped_frames++; |
| 1976 | } |
| 1977 | |
| 1978 | } /* for (each frame) */ |
| 1979 | } |
| 1980 | |
| 1981 | if (wake) { |
| 1982 | kill_fasync(&video->fasync, SIGIO, POLL_OUT); |
| 1983 | |
| 1984 | /* wake readers/writers/ioctl'ers */ |
| 1985 | wake_up_interruptible(&video->waitq); |
| 1986 | } |
| 1987 | |
| 1988 | out: |
| 1989 | spin_unlock(&video->spinlock); |
| 1990 | } |
| 1991 | |
| 1992 | static void ir_tasklet_func(unsigned long data) |
| 1993 | { |
| 1994 | int wake = 0; |
| 1995 | struct video_card *video = (struct video_card*) data; |
| 1996 | |
| 1997 | spin_lock(&video->spinlock); |
| 1998 | |
| 1999 | if (!video->dma_running) |
| 2000 | goto out; |
| 2001 | |
| 2002 | if ( (video->ohci_ir_ctx != -1) && |
| 2003 | (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) ) { |
| 2004 | |
| 2005 | int sof=0; /* start-of-frame flag */ |
| 2006 | struct frame *f; |
| 2007 | u16 packet_length, packet_time; |
| 2008 | int i, dbc=0; |
| 2009 | struct DMA_descriptor_block *block = NULL; |
| 2010 | u16 xferstatus; |
| 2011 | |
| 2012 | int next_i, prev_i; |
| 2013 | struct DMA_descriptor_block *next = NULL; |
| 2014 | dma_addr_t next_dma = 0; |
| 2015 | struct DMA_descriptor_block *prev = NULL; |
| 2016 | |
| 2017 | /* loop over all descriptors in all frames */ |
| 2018 | for (i = 0; i < video->n_frames*MAX_PACKETS; i++) { |
| 2019 | struct packet *p = dma_region_i(&video->packet_buf, struct packet, video->current_packet); |
| 2020 | |
| 2021 | /* make sure we are seeing the latest changes to p */ |
| 2022 | dma_region_sync_for_cpu(&video->packet_buf, |
| 2023 | (unsigned long) p - (unsigned long) video->packet_buf.kvirt, |
| 2024 | sizeof(struct packet)); |
| 2025 | |
| 2026 | packet_length = le16_to_cpu(p->data_length); |
| 2027 | packet_time = le16_to_cpu(p->timestamp); |
| 2028 | |
| 2029 | irq_printk("received packet %02d, timestamp=%04x, length=%04x, sof=%02x%02x\n", video->current_packet, |
| 2030 | packet_time, packet_length, |
| 2031 | p->data[0], p->data[1]); |
| 2032 | |
| 2033 | /* get the descriptor based on packet_buffer cursor */ |
| 2034 | f = video->frames[video->current_packet / MAX_PACKETS]; |
| 2035 | block = &(f->descriptor_pool[video->current_packet % MAX_PACKETS]); |
| 2036 | xferstatus = le32_to_cpu(block->u.in.il.q[3]) >> 16; |
| 2037 | xferstatus &= 0x1F; |
| 2038 | irq_printk("ir_tasklet_func: xferStatus/resCount [%d] = 0x%08x\n", i, le32_to_cpu(block->u.in.il.q[3]) ); |
| 2039 | |
| 2040 | /* get the current frame */ |
| 2041 | f = video->frames[video->active_frame]; |
| 2042 | |
| 2043 | /* exclude empty packet */ |
| 2044 | if (packet_length > 8 && xferstatus == 0x11) { |
| 2045 | /* check for start of frame */ |
| 2046 | /* DRD> Changed to check section type ([0]>>5==0) |
| 2047 | and dif sequence ([1]>>4==0) */ |
| 2048 | sof = ( (p->data[0] >> 5) == 0 && (p->data[1] >> 4) == 0); |
| 2049 | |
| 2050 | dbc = (int) (p->cip_h1 >> 24); |
| 2051 | if ( video->continuity_counter != -1 && dbc > ((video->continuity_counter + 1) % 256) ) |
| 2052 | { |
| 2053 | printk(KERN_WARNING "dv1394: discontinuity detected, dropping all frames\n" ); |
| 2054 | video->dropped_frames += video->n_clear_frames + 1; |
| 2055 | video->first_frame = 0; |
| 2056 | video->n_clear_frames = 0; |
| 2057 | video->first_clear_frame = -1; |
| 2058 | } |
| 2059 | video->continuity_counter = dbc; |
| 2060 | |
| 2061 | if (!video->first_frame) { |
| 2062 | if (sof) { |
| 2063 | video->first_frame = 1; |
| 2064 | } |
| 2065 | |
| 2066 | } else if (sof) { |
| 2067 | /* close current frame */ |
| 2068 | frame_reset(f); /* f->state = STATE_CLEAR */ |
| 2069 | video->n_clear_frames++; |
| 2070 | if (video->n_clear_frames > video->n_frames) { |
| 2071 | video->dropped_frames++; |
| 2072 | printk(KERN_WARNING "dv1394: dropped a frame during reception\n" ); |
| 2073 | video->n_clear_frames = video->n_frames-1; |
| 2074 | video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames; |
| 2075 | } |
| 2076 | if (video->first_clear_frame == -1) |
| 2077 | video->first_clear_frame = video->active_frame; |
| 2078 | |
| 2079 | /* get the next frame */ |
| 2080 | video->active_frame = (video->active_frame + 1) % video->n_frames; |
| 2081 | f = video->frames[video->active_frame]; |
| 2082 | irq_printk(" frame received, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n", |
| 2083 | video->active_frame, video->n_clear_frames, video->first_clear_frame); |
| 2084 | } |
| 2085 | if (video->first_frame) { |
| 2086 | if (sof) { |
| 2087 | /* open next frame */ |
| 2088 | f->state = FRAME_READY; |
| 2089 | } |
| 2090 | |
| 2091 | /* copy to buffer */ |
| 2092 | if (f->n_packets > (video->frame_size / 480)) { |
| 2093 | printk(KERN_ERR "frame buffer overflow during receive\n"); |
| 2094 | } |
| 2095 | |
| 2096 | frame_put_packet(f, p); |
| 2097 | |
| 2098 | } /* first_frame */ |
| 2099 | } |
| 2100 | |
| 2101 | /* stop, end of ready packets */ |
| 2102 | else if (xferstatus == 0) { |
| 2103 | break; |
| 2104 | } |
| 2105 | |
| 2106 | /* reset xferStatus & resCount */ |
| 2107 | block->u.in.il.q[3] = cpu_to_le32(512); |
| 2108 | |
| 2109 | /* terminate dma chain at this (next) packet */ |
| 2110 | next_i = video->current_packet; |
| 2111 | f = video->frames[next_i / MAX_PACKETS]; |
| 2112 | next = &(f->descriptor_pool[next_i % MAX_PACKETS]); |
| 2113 | next_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma; |
Harvey Harrison | c82cdea | 2008-12-13 15:21:29 -0800 | [diff] [blame] | 2114 | next->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */ |
| 2115 | next->u.in.il.q[2] = cpu_to_le32(0); /* disable branch */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | |
| 2117 | /* link previous to next */ |
| 2118 | prev_i = (next_i == 0) ? (MAX_PACKETS * video->n_frames - 1) : (next_i - 1); |
| 2119 | f = video->frames[prev_i / MAX_PACKETS]; |
| 2120 | prev = &(f->descriptor_pool[prev_i % MAX_PACKETS]); |
| 2121 | if (prev_i % (MAX_PACKETS/2)) { |
Harvey Harrison | c82cdea | 2008-12-13 15:21:29 -0800 | [diff] [blame] | 2122 | prev->u.in.il.q[0] &= ~cpu_to_le32(3 << 20); /* no interrupt */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | } else { |
Harvey Harrison | c82cdea | 2008-12-13 15:21:29 -0800 | [diff] [blame] | 2124 | prev->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | } |
| 2126 | prev->u.in.il.q[2] = cpu_to_le32(next_dma | 1); /* set Z=1 */ |
| 2127 | wmb(); |
| 2128 | |
| 2129 | /* wake up DMA in case it fell asleep */ |
| 2130 | reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12)); |
| 2131 | |
| 2132 | /* advance packet_buffer cursor */ |
| 2133 | video->current_packet = (video->current_packet + 1) % (MAX_PACKETS * video->n_frames); |
| 2134 | |
| 2135 | } /* for all packets */ |
| 2136 | |
| 2137 | wake = 1; /* why the hell not? */ |
| 2138 | |
| 2139 | } /* receive interrupt */ |
| 2140 | |
| 2141 | if (wake) { |
| 2142 | kill_fasync(&video->fasync, SIGIO, POLL_IN); |
| 2143 | |
| 2144 | /* wake readers/writers/ioctl'ers */ |
| 2145 | wake_up_interruptible(&video->waitq); |
| 2146 | } |
| 2147 | |
| 2148 | out: |
| 2149 | spin_unlock(&video->spinlock); |
| 2150 | } |
| 2151 | |
| 2152 | static struct cdev dv1394_cdev; |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 2153 | static const struct file_operations dv1394_fops= |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | { |
| 2155 | .owner = THIS_MODULE, |
| 2156 | .poll = dv1394_poll, |
| 2157 | .unlocked_ioctl = dv1394_ioctl, |
| 2158 | #ifdef CONFIG_COMPAT |
| 2159 | .compat_ioctl = dv1394_compat_ioctl, |
| 2160 | #endif |
| 2161 | .mmap = dv1394_mmap, |
| 2162 | .open = dv1394_open, |
| 2163 | .write = dv1394_write, |
| 2164 | .read = dv1394_read, |
| 2165 | .release = dv1394_release, |
| 2166 | .fasync = dv1394_fasync, |
| 2167 | }; |
| 2168 | |
| 2169 | |
| 2170 | /*** HOTPLUG STUFF **********************************************************/ |
| 2171 | /* |
| 2172 | * Export information about protocols/devices supported by this driver. |
| 2173 | */ |
Tony Breeds | e386497 | 2008-04-24 09:02:04 +0200 | [diff] [blame] | 2174 | #ifdef MODULE |
Stefan Richter | c640946 | 2009-02-15 23:11:38 +0100 | [diff] [blame] | 2175 | static const struct ieee1394_device_id dv1394_id_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | { |
| 2177 | .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION, |
| 2178 | .specifier_id = AVC_UNIT_SPEC_ID_ENTRY & 0xffffff, |
| 2179 | .version = AVC_SW_VERSION_ENTRY & 0xffffff |
| 2180 | }, |
| 2181 | { } |
| 2182 | }; |
| 2183 | |
| 2184 | MODULE_DEVICE_TABLE(ieee1394, dv1394_id_table); |
Tony Breeds | e386497 | 2008-04-24 09:02:04 +0200 | [diff] [blame] | 2185 | #endif /* MODULE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | |
| 2187 | static struct hpsb_protocol_driver dv1394_driver = { |
Stefan Richter | d2ace29 | 2008-02-18 21:11:07 +0100 | [diff] [blame] | 2188 | .name = "dv1394", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | }; |
| 2190 | |
| 2191 | |
| 2192 | /*** IEEE1394 HPSB CALLBACKS ***********************************************/ |
| 2193 | |
| 2194 | static int dv1394_init(struct ti_ohci *ohci, enum pal_or_ntsc format, enum modes mode) |
| 2195 | { |
| 2196 | struct video_card *video; |
| 2197 | unsigned long flags; |
| 2198 | int i; |
| 2199 | |
Stefan Richter | 8551158 | 2005-11-07 06:31:45 -0500 | [diff] [blame] | 2200 | video = kzalloc(sizeof(*video), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | if (!video) { |
| 2202 | printk(KERN_ERR "dv1394: cannot allocate video_card\n"); |
Stefan Richter | a874844 | 2006-03-28 19:55:41 -0500 | [diff] [blame] | 2203 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | } |
| 2205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2206 | video->ohci = ohci; |
| 2207 | /* lower 2 bits of id indicate which of four "plugs" |
| 2208 | per host */ |
| 2209 | video->id = ohci->host->id << 2; |
| 2210 | if (format == DV1394_NTSC) |
| 2211 | video->id |= mode; |
| 2212 | else |
| 2213 | video->id |= 2 + mode; |
| 2214 | |
| 2215 | video->ohci_it_ctx = -1; |
| 2216 | video->ohci_ir_ctx = -1; |
| 2217 | |
| 2218 | video->ohci_IsoXmitContextControlSet = 0; |
| 2219 | video->ohci_IsoXmitContextControlClear = 0; |
| 2220 | video->ohci_IsoXmitCommandPtr = 0; |
| 2221 | |
| 2222 | video->ohci_IsoRcvContextControlSet = 0; |
| 2223 | video->ohci_IsoRcvContextControlClear = 0; |
| 2224 | video->ohci_IsoRcvCommandPtr = 0; |
| 2225 | video->ohci_IsoRcvContextMatch = 0; |
| 2226 | |
| 2227 | video->n_frames = 0; /* flag that video is not initialized */ |
| 2228 | video->channel = 63; /* default to broadcast channel */ |
| 2229 | video->active_frame = -1; |
| 2230 | |
| 2231 | /* initialize the following */ |
| 2232 | video->pal_or_ntsc = format; |
| 2233 | video->cip_n = 0; /* 0 = use builtin default */ |
| 2234 | video->cip_d = 0; |
| 2235 | video->syt_offset = 0; |
| 2236 | video->mode = mode; |
| 2237 | |
| 2238 | for (i = 0; i < DV1394_MAX_FRAMES; i++) |
| 2239 | video->frames[i] = NULL; |
| 2240 | |
| 2241 | dma_region_init(&video->dv_buf); |
| 2242 | video->dv_buf_size = 0; |
| 2243 | dma_region_init(&video->packet_buf); |
| 2244 | video->packet_buf_size = 0; |
| 2245 | |
| 2246 | clear_bit(0, &video->open); |
| 2247 | spin_lock_init(&video->spinlock); |
| 2248 | video->dma_running = 0; |
Stefan Richter | 438bd52 | 2006-07-03 12:02:32 -0400 | [diff] [blame] | 2249 | mutex_init(&video->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | init_waitqueue_head(&video->waitq); |
| 2251 | video->fasync = NULL; |
| 2252 | |
| 2253 | spin_lock_irqsave(&dv1394_cards_lock, flags); |
| 2254 | INIT_LIST_HEAD(&video->list); |
| 2255 | list_add_tail(&video->list, &dv1394_cards); |
| 2256 | spin_unlock_irqrestore(&dv1394_cards_lock, flags); |
| 2257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | debug_printk("dv1394: dv1394_init() OK on ID %d\n", video->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | } |
| 2261 | |
Stefan Richter | 12ba145 | 2007-01-27 13:54:23 +0100 | [diff] [blame] | 2262 | static void dv1394_remove_host(struct hpsb_host *host) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | { |
Stefan Richter | 12ba145 | 2007-01-27 13:54:23 +0100 | [diff] [blame] | 2264 | struct video_card *video, *tmp_video; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | unsigned long flags; |
Stefan Richter | 12ba145 | 2007-01-27 13:54:23 +0100 | [diff] [blame] | 2266 | int found_ohci_card = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2268 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | video = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | spin_lock_irqsave(&dv1394_cards_lock, flags); |
Stefan Richter | 12ba145 | 2007-01-27 13:54:23 +0100 | [diff] [blame] | 2271 | list_for_each_entry(tmp_video, &dv1394_cards, list) { |
| 2272 | if ((tmp_video->id >> 2) == host->id) { |
| 2273 | list_del(&tmp_video->list); |
| 2274 | video = tmp_video; |
Stefan Richter | 88e7bf2 | 2007-01-27 13:52:52 +0100 | [diff] [blame] | 2275 | found_ohci_card = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2276 | break; |
| 2277 | } |
| 2278 | } |
| 2279 | spin_unlock_irqrestore(&dv1394_cards_lock, flags); |
| 2280 | |
Stefan Richter | 12ba145 | 2007-01-27 13:54:23 +0100 | [diff] [blame] | 2281 | if (video) { |
| 2282 | do_dv1394_shutdown(video, 1); |
| 2283 | kfree(video); |
| 2284 | } |
| 2285 | } while (video); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | |
Stefan Richter | 88e7bf2 | 2007-01-27 13:52:52 +0100 | [diff] [blame] | 2287 | if (found_ohci_card) |
Kay Sievers | dd7f292 | 2007-05-25 11:50:53 +0200 | [diff] [blame] | 2288 | device_destroy(hpsb_protocol_class, MKDEV(IEEE1394_MAJOR, |
Stefan Richter | 88e7bf2 | 2007-01-27 13:52:52 +0100 | [diff] [blame] | 2289 | IEEE1394_MINOR_BLOCK_DV1394 * 16 + (host->id << 2))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | } |
| 2291 | |
Stefan Richter | 12ba145 | 2007-01-27 13:54:23 +0100 | [diff] [blame] | 2292 | static void dv1394_add_host(struct hpsb_host *host) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | { |
| 2294 | struct ti_ohci *ohci; |
| 2295 | int id = host->id; |
| 2296 | |
| 2297 | /* We only work with the OHCI-1394 driver */ |
| 2298 | if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME)) |
| 2299 | return; |
| 2300 | |
| 2301 | ohci = (struct ti_ohci *)host->hostdata; |
| 2302 | |
Greg Kroah-Hartman | 6229df3 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 2303 | device_create(hpsb_protocol_class, NULL, |
| 2304 | MKDEV(IEEE1394_MAJOR, |
| 2305 | IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2)), |
| 2306 | NULL, "dv1394-%d", id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | |
| 2308 | dv1394_init(ohci, DV1394_NTSC, MODE_RECEIVE); |
| 2309 | dv1394_init(ohci, DV1394_NTSC, MODE_TRANSMIT); |
| 2310 | dv1394_init(ohci, DV1394_PAL, MODE_RECEIVE); |
| 2311 | dv1394_init(ohci, DV1394_PAL, MODE_TRANSMIT); |
| 2312 | } |
| 2313 | |
| 2314 | |
| 2315 | /* Bus reset handler. In the event of a bus reset, we may need to |
| 2316 | re-start the DMA contexts - otherwise the user program would |
| 2317 | end up waiting forever. |
| 2318 | */ |
| 2319 | |
| 2320 | static void dv1394_host_reset(struct hpsb_host *host) |
| 2321 | { |
| 2322 | struct ti_ohci *ohci; |
| 2323 | struct video_card *video = NULL, *tmp_vid; |
| 2324 | unsigned long flags; |
| 2325 | |
| 2326 | /* We only work with the OHCI-1394 driver */ |
| 2327 | if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME)) |
| 2328 | return; |
| 2329 | |
| 2330 | ohci = (struct ti_ohci *)host->hostdata; |
| 2331 | |
| 2332 | |
| 2333 | /* find the corresponding video_cards */ |
| 2334 | spin_lock_irqsave(&dv1394_cards_lock, flags); |
| 2335 | list_for_each_entry(tmp_vid, &dv1394_cards, list) { |
| 2336 | if ((tmp_vid->id >> 2) == host->id) { |
| 2337 | video = tmp_vid; |
| 2338 | break; |
| 2339 | } |
| 2340 | } |
| 2341 | spin_unlock_irqrestore(&dv1394_cards_lock, flags); |
| 2342 | |
| 2343 | if (!video) |
| 2344 | return; |
| 2345 | |
| 2346 | |
| 2347 | spin_lock_irqsave(&video->spinlock, flags); |
| 2348 | |
| 2349 | if (!video->dma_running) |
| 2350 | goto out; |
| 2351 | |
| 2352 | /* check IT context */ |
| 2353 | if (video->ohci_it_ctx != -1) { |
| 2354 | u32 ctx; |
| 2355 | |
| 2356 | ctx = reg_read(video->ohci, video->ohci_IsoXmitContextControlSet); |
| 2357 | |
| 2358 | /* if (RUN but not ACTIVE) */ |
| 2359 | if ( (ctx & (1<<15)) && |
| 2360 | !(ctx & (1<<10)) ) { |
| 2361 | |
| 2362 | debug_printk("dv1394: IT context stopped due to bus reset; waking it up\n"); |
| 2363 | |
| 2364 | /* to be safe, assume a frame has been dropped. User-space programs |
| 2365 | should handle this condition like an underflow. */ |
| 2366 | video->dropped_frames++; |
| 2367 | |
| 2368 | /* for some reason you must clear, then re-set the RUN bit to restart DMA */ |
| 2369 | |
| 2370 | /* clear RUN */ |
| 2371 | reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15)); |
| 2372 | flush_pci_write(video->ohci); |
| 2373 | |
| 2374 | /* set RUN */ |
| 2375 | reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 15)); |
| 2376 | flush_pci_write(video->ohci); |
| 2377 | |
| 2378 | /* set the WAKE bit (just in case; this isn't strictly necessary) */ |
| 2379 | reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 12)); |
| 2380 | flush_pci_write(video->ohci); |
| 2381 | |
| 2382 | irq_printk("dv1394: AFTER IT restart ctx 0x%08x ptr 0x%08x\n", |
| 2383 | reg_read(video->ohci, video->ohci_IsoXmitContextControlSet), |
| 2384 | reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)); |
| 2385 | } |
| 2386 | } |
| 2387 | |
| 2388 | /* check IR context */ |
| 2389 | if (video->ohci_ir_ctx != -1) { |
| 2390 | u32 ctx; |
| 2391 | |
| 2392 | ctx = reg_read(video->ohci, video->ohci_IsoRcvContextControlSet); |
| 2393 | |
| 2394 | /* if (RUN but not ACTIVE) */ |
| 2395 | if ( (ctx & (1<<15)) && |
| 2396 | !(ctx & (1<<10)) ) { |
| 2397 | |
| 2398 | debug_printk("dv1394: IR context stopped due to bus reset; waking it up\n"); |
| 2399 | |
| 2400 | /* to be safe, assume a frame has been dropped. User-space programs |
| 2401 | should handle this condition like an overflow. */ |
| 2402 | video->dropped_frames++; |
| 2403 | |
| 2404 | /* for some reason you must clear, then re-set the RUN bit to restart DMA */ |
| 2405 | /* XXX this doesn't work for me, I can't get IR DMA to restart :[ */ |
| 2406 | |
| 2407 | /* clear RUN */ |
| 2408 | reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15)); |
| 2409 | flush_pci_write(video->ohci); |
| 2410 | |
| 2411 | /* set RUN */ |
| 2412 | reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 15)); |
| 2413 | flush_pci_write(video->ohci); |
| 2414 | |
| 2415 | /* set the WAKE bit (just in case; this isn't strictly necessary) */ |
| 2416 | reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12)); |
| 2417 | flush_pci_write(video->ohci); |
| 2418 | |
| 2419 | irq_printk("dv1394: AFTER IR restart ctx 0x%08x ptr 0x%08x\n", |
| 2420 | reg_read(video->ohci, video->ohci_IsoRcvContextControlSet), |
| 2421 | reg_read(video->ohci, video->ohci_IsoRcvCommandPtr)); |
| 2422 | } |
| 2423 | } |
| 2424 | |
| 2425 | out: |
| 2426 | spin_unlock_irqrestore(&video->spinlock, flags); |
| 2427 | |
| 2428 | /* wake readers/writers/ioctl'ers */ |
| 2429 | wake_up_interruptible(&video->waitq); |
| 2430 | } |
| 2431 | |
| 2432 | static struct hpsb_highlevel dv1394_highlevel = { |
| 2433 | .name = "dv1394", |
| 2434 | .add_host = dv1394_add_host, |
| 2435 | .remove_host = dv1394_remove_host, |
| 2436 | .host_reset = dv1394_host_reset, |
| 2437 | }; |
| 2438 | |
| 2439 | #ifdef CONFIG_COMPAT |
| 2440 | |
| 2441 | #define DV1394_IOC32_INIT _IOW('#', 0x06, struct dv1394_init32) |
| 2442 | #define DV1394_IOC32_GET_STATUS _IOR('#', 0x0c, struct dv1394_status32) |
| 2443 | |
| 2444 | struct dv1394_init32 { |
| 2445 | u32 api_version; |
| 2446 | u32 channel; |
| 2447 | u32 n_frames; |
| 2448 | u32 format; |
| 2449 | u32 cip_n; |
| 2450 | u32 cip_d; |
| 2451 | u32 syt_offset; |
| 2452 | }; |
| 2453 | |
| 2454 | struct dv1394_status32 { |
| 2455 | struct dv1394_init32 init; |
| 2456 | s32 active_frame; |
| 2457 | u32 first_clear_frame; |
| 2458 | u32 n_clear_frames; |
| 2459 | u32 dropped_frames; |
| 2460 | }; |
| 2461 | |
| 2462 | /* RED-PEN: this should use compat_alloc_userspace instead */ |
| 2463 | |
| 2464 | static int handle_dv1394_init(struct file *file, unsigned int cmd, unsigned long arg) |
| 2465 | { |
| 2466 | struct dv1394_init32 dv32; |
| 2467 | struct dv1394_init dv; |
| 2468 | mm_segment_t old_fs; |
| 2469 | int ret; |
| 2470 | |
| 2471 | if (file->f_op->unlocked_ioctl != dv1394_ioctl) |
| 2472 | return -EFAULT; |
| 2473 | |
| 2474 | if (copy_from_user(&dv32, (void __user *)arg, sizeof(dv32))) |
| 2475 | return -EFAULT; |
| 2476 | |
| 2477 | dv.api_version = dv32.api_version; |
| 2478 | dv.channel = dv32.channel; |
| 2479 | dv.n_frames = dv32.n_frames; |
| 2480 | dv.format = dv32.format; |
| 2481 | dv.cip_n = (unsigned long)dv32.cip_n; |
| 2482 | dv.cip_d = (unsigned long)dv32.cip_d; |
| 2483 | dv.syt_offset = dv32.syt_offset; |
| 2484 | |
| 2485 | old_fs = get_fs(); |
| 2486 | set_fs(KERNEL_DS); |
| 2487 | ret = dv1394_ioctl(file, DV1394_IOC_INIT, (unsigned long)&dv); |
| 2488 | set_fs(old_fs); |
| 2489 | |
| 2490 | return ret; |
| 2491 | } |
| 2492 | |
| 2493 | static int handle_dv1394_get_status(struct file *file, unsigned int cmd, unsigned long arg) |
| 2494 | { |
| 2495 | struct dv1394_status32 dv32; |
| 2496 | struct dv1394_status dv; |
| 2497 | mm_segment_t old_fs; |
| 2498 | int ret; |
| 2499 | |
| 2500 | if (file->f_op->unlocked_ioctl != dv1394_ioctl) |
| 2501 | return -EFAULT; |
| 2502 | |
| 2503 | old_fs = get_fs(); |
| 2504 | set_fs(KERNEL_DS); |
| 2505 | ret = dv1394_ioctl(file, DV1394_IOC_GET_STATUS, (unsigned long)&dv); |
| 2506 | set_fs(old_fs); |
| 2507 | |
| 2508 | if (!ret) { |
| 2509 | dv32.init.api_version = dv.init.api_version; |
| 2510 | dv32.init.channel = dv.init.channel; |
| 2511 | dv32.init.n_frames = dv.init.n_frames; |
| 2512 | dv32.init.format = dv.init.format; |
| 2513 | dv32.init.cip_n = (u32)dv.init.cip_n; |
| 2514 | dv32.init.cip_d = (u32)dv.init.cip_d; |
| 2515 | dv32.init.syt_offset = dv.init.syt_offset; |
| 2516 | dv32.active_frame = dv.active_frame; |
| 2517 | dv32.first_clear_frame = dv.first_clear_frame; |
| 2518 | dv32.n_clear_frames = dv.n_clear_frames; |
| 2519 | dv32.dropped_frames = dv.dropped_frames; |
| 2520 | |
| 2521 | if (copy_to_user((struct dv1394_status32 __user *)arg, &dv32, sizeof(dv32))) |
| 2522 | ret = -EFAULT; |
| 2523 | } |
| 2524 | |
| 2525 | return ret; |
| 2526 | } |
| 2527 | |
| 2528 | |
| 2529 | |
| 2530 | static long dv1394_compat_ioctl(struct file *file, unsigned int cmd, |
| 2531 | unsigned long arg) |
| 2532 | { |
| 2533 | switch (cmd) { |
| 2534 | case DV1394_IOC_SHUTDOWN: |
| 2535 | case DV1394_IOC_SUBMIT_FRAMES: |
| 2536 | case DV1394_IOC_WAIT_FRAMES: |
| 2537 | case DV1394_IOC_RECEIVE_FRAMES: |
| 2538 | case DV1394_IOC_START_RECEIVE: |
| 2539 | return dv1394_ioctl(file, cmd, arg); |
| 2540 | |
| 2541 | case DV1394_IOC32_INIT: |
| 2542 | return handle_dv1394_init(file, cmd, arg); |
| 2543 | case DV1394_IOC32_GET_STATUS: |
| 2544 | return handle_dv1394_get_status(file, cmd, arg); |
| 2545 | default: |
| 2546 | return -ENOIOCTLCMD; |
| 2547 | } |
| 2548 | } |
| 2549 | |
| 2550 | #endif /* CONFIG_COMPAT */ |
| 2551 | |
| 2552 | |
| 2553 | /*** KERNEL MODULE HANDLERS ************************************************/ |
| 2554 | |
| 2555 | MODULE_AUTHOR("Dan Maas <dmaas@dcine.com>, Dan Dennedy <dan@dennedy.org>"); |
| 2556 | MODULE_DESCRIPTION("driver for DV input/output on OHCI board"); |
| 2557 | MODULE_SUPPORTED_DEVICE("dv1394"); |
| 2558 | MODULE_LICENSE("GPL"); |
| 2559 | |
| 2560 | static void __exit dv1394_exit_module(void) |
| 2561 | { |
| 2562 | hpsb_unregister_protocol(&dv1394_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2563 | hpsb_unregister_highlevel(&dv1394_highlevel); |
| 2564 | cdev_del(&dv1394_cdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2565 | } |
| 2566 | |
| 2567 | static int __init dv1394_init_module(void) |
| 2568 | { |
| 2569 | int ret; |
| 2570 | |
| 2571 | cdev_init(&dv1394_cdev, &dv1394_fops); |
| 2572 | dv1394_cdev.owner = THIS_MODULE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2573 | ret = cdev_add(&dv1394_cdev, IEEE1394_DV1394_DEV, 16); |
| 2574 | if (ret) { |
| 2575 | printk(KERN_ERR "dv1394: unable to register character device\n"); |
| 2576 | return ret; |
| 2577 | } |
| 2578 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | hpsb_register_highlevel(&dv1394_highlevel); |
| 2580 | |
| 2581 | ret = hpsb_register_protocol(&dv1394_driver); |
| 2582 | if (ret) { |
| 2583 | printk(KERN_ERR "dv1394: failed to register protocol\n"); |
| 2584 | hpsb_unregister_highlevel(&dv1394_highlevel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2585 | cdev_del(&dv1394_cdev); |
| 2586 | return ret; |
| 2587 | } |
| 2588 | |
| 2589 | return 0; |
| 2590 | } |
| 2591 | |
| 2592 | module_init(dv1394_init_module); |
| 2593 | module_exit(dv1394_exit_module); |