Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 2 | * sound/oss/dmabuf.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * The DMA buffer manager for digitized voice applications |
| 5 | */ |
| 6 | /* |
| 7 | * Copyright (C) by Hannu Savolainen 1993-1997 |
| 8 | * |
| 9 | * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) |
| 10 | * Version 2 (June 1991). See the "COPYING" file distributed with this software |
| 11 | * for more info. |
| 12 | * |
| 13 | * Thomas Sailer : moved several static variables into struct audio_operations |
| 14 | * (which is grossly misnamed btw.) because they have the same |
| 15 | * lifetime as the rest in there and dynamic allocation saves |
| 16 | * 12k or so |
| 17 | * Thomas Sailer : remove {in,out}_sleep_flag. It was used for the sleeper to |
| 18 | * determine if it was woken up by the expiring timeout or by |
| 19 | * an explicit wake_up. The return value from schedule_timeout |
| 20 | * can be used instead; if 0, the wakeup was due to the timeout. |
| 21 | * |
| 22 | * Rob Riggs Added persistent DMA buffers (1998/10/17) |
| 23 | */ |
| 24 | |
| 25 | #define BE_CONSERVATIVE |
| 26 | #define SAMPLE_ROUNDUP 0 |
| 27 | |
Al Viro | f23f6e0 | 2006-10-20 15:17:02 -0400 | [diff] [blame] | 28 | #include <linux/mm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 29 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include "sound_config.h" |
| 31 | |
| 32 | #define DMAP_FREE_ON_CLOSE 0 |
| 33 | #define DMAP_KEEP_ON_CLOSE 1 |
| 34 | extern int sound_dmap_flag; |
| 35 | |
| 36 | static void dma_reset_output(int dev); |
| 37 | static void dma_reset_input(int dev); |
| 38 | static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode); |
| 39 | |
| 40 | |
| 41 | |
| 42 | static int debugmem; /* switched off by default */ |
| 43 | static int dma_buffsize = DSP_BUFFSIZE; |
| 44 | |
| 45 | static long dmabuf_timeout(struct dma_buffparms *dmap) |
| 46 | { |
| 47 | long tmout; |
| 48 | |
| 49 | tmout = (dmap->fragment_size * HZ) / dmap->data_rate; |
| 50 | tmout += HZ / 5; /* Some safety distance */ |
| 51 | if (tmout < (HZ / 2)) |
| 52 | tmout = HZ / 2; |
| 53 | if (tmout > 20 * HZ) |
| 54 | tmout = 20 * HZ; |
| 55 | return tmout; |
| 56 | } |
| 57 | |
| 58 | static int sound_alloc_dmap(struct dma_buffparms *dmap) |
| 59 | { |
| 60 | char *start_addr, *end_addr; |
| 61 | int dma_pagesize; |
| 62 | int sz, size; |
| 63 | struct page *page; |
| 64 | |
| 65 | dmap->mapping_flags &= ~DMA_MAP_MAPPED; |
| 66 | |
| 67 | if (dmap->raw_buf != NULL) |
| 68 | return 0; /* Already done */ |
| 69 | if (dma_buffsize < 4096) |
| 70 | dma_buffsize = 4096; |
| 71 | dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024); |
| 72 | |
| 73 | /* |
| 74 | * Now check for the Cyrix problem. |
| 75 | */ |
| 76 | |
| 77 | if(isa_dma_bridge_buggy==2) |
| 78 | dma_pagesize=32768; |
| 79 | |
| 80 | dmap->raw_buf = NULL; |
| 81 | dmap->buffsize = dma_buffsize; |
| 82 | if (dmap->buffsize > dma_pagesize) |
| 83 | dmap->buffsize = dma_pagesize; |
| 84 | start_addr = NULL; |
| 85 | /* |
| 86 | * Now loop until we get a free buffer. Try to get smaller buffer if |
| 87 | * it fails. Don't accept smaller than 8k buffer for performance |
| 88 | * reasons. |
| 89 | */ |
| 90 | while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) { |
| 91 | for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1); |
| 92 | dmap->buffsize = PAGE_SIZE * (1 << sz); |
| 93 | start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA|__GFP_NOWARN, sz); |
| 94 | if (start_addr == NULL) |
| 95 | dmap->buffsize /= 2; |
| 96 | } |
| 97 | |
| 98 | if (start_addr == NULL) { |
| 99 | printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n"); |
| 100 | return -ENOMEM; |
| 101 | } else { |
| 102 | /* make some checks */ |
| 103 | end_addr = start_addr + dmap->buffsize - 1; |
| 104 | |
| 105 | if (debugmem) |
| 106 | printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr); |
| 107 | |
| 108 | /* now check if it fits into the same dma-pagesize */ |
| 109 | |
| 110 | if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1)) |
| 111 | || end_addr >= (char *) (MAX_DMA_ADDRESS)) { |
| 112 | printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize); |
| 113 | return -EFAULT; |
| 114 | } |
| 115 | } |
| 116 | dmap->raw_buf = start_addr; |
| 117 | dmap->raw_buf_phys = virt_to_bus(start_addr); |
| 118 | |
| 119 | for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++) |
| 120 | SetPageReserved(page); |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | static void sound_free_dmap(struct dma_buffparms *dmap) |
| 125 | { |
| 126 | int sz, size; |
| 127 | struct page *page; |
| 128 | unsigned long start_addr, end_addr; |
| 129 | |
| 130 | if (dmap->raw_buf == NULL) |
| 131 | return; |
| 132 | if (dmap->mapping_flags & DMA_MAP_MAPPED) |
| 133 | return; /* Don't free mmapped buffer. Will use it next time */ |
| 134 | for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1); |
| 135 | |
| 136 | start_addr = (unsigned long) dmap->raw_buf; |
| 137 | end_addr = start_addr + dmap->buffsize; |
| 138 | |
| 139 | for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++) |
| 140 | ClearPageReserved(page); |
| 141 | |
| 142 | free_pages((unsigned long) dmap->raw_buf, sz); |
| 143 | dmap->raw_buf = NULL; |
| 144 | } |
| 145 | |
| 146 | |
| 147 | /* Intel version !!!!!!!!! */ |
| 148 | |
| 149 | static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode) |
| 150 | { |
| 151 | unsigned long flags; |
| 152 | int chan = dmap->dma; |
| 153 | |
| 154 | /* printk( "Start DMA%d %d, %d\n", chan, (int)(physaddr-dmap->raw_buf_phys), count); */ |
| 155 | |
| 156 | flags = claim_dma_lock(); |
| 157 | disable_dma(chan); |
| 158 | clear_dma_ff(chan); |
| 159 | set_dma_mode(chan, dma_mode); |
| 160 | set_dma_addr(chan, physaddr); |
| 161 | set_dma_count(chan, count); |
| 162 | enable_dma(chan); |
| 163 | release_dma_lock(flags); |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | static void dma_init_buffers(struct dma_buffparms *dmap) |
| 169 | { |
| 170 | dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; |
| 171 | dmap->byte_counter = 0; |
| 172 | dmap->max_byte_counter = 8000 * 60 * 60; |
| 173 | dmap->bytes_in_use = dmap->buffsize; |
| 174 | |
| 175 | dmap->dma_mode = DMODE_NONE; |
| 176 | dmap->mapping_flags = 0; |
| 177 | dmap->neutral_byte = 0x80; |
| 178 | dmap->data_rate = 8000; |
| 179 | dmap->cfrag = -1; |
| 180 | dmap->closing = 0; |
| 181 | dmap->nbufs = 1; |
| 182 | dmap->flags = DMA_BUSY; /* Other flags off */ |
| 183 | } |
| 184 | |
| 185 | static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap) |
| 186 | { |
| 187 | int err; |
| 188 | |
| 189 | if (dmap->flags & DMA_BUSY) |
| 190 | return -EBUSY; |
| 191 | if ((err = sound_alloc_dmap(dmap)) < 0) |
| 192 | return err; |
| 193 | |
| 194 | if (dmap->raw_buf == NULL) { |
| 195 | printk(KERN_WARNING "Sound: DMA buffers not available\n"); |
| 196 | return -ENOSPC; /* Memory allocation failed during boot */ |
| 197 | } |
| 198 | if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) { |
| 199 | printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma); |
| 200 | return -EBUSY; |
| 201 | } |
| 202 | dma_init_buffers(dmap); |
| 203 | spin_lock_init(&dmap->lock); |
| 204 | dmap->open_mode = mode; |
| 205 | dmap->subdivision = dmap->underrun_count = 0; |
| 206 | dmap->fragment_size = 0; |
| 207 | dmap->max_fragments = 65536; /* Just a large value */ |
| 208 | dmap->byte_counter = 0; |
| 209 | dmap->max_byte_counter = 8000 * 60 * 60; |
| 210 | dmap->applic_profile = APF_NORMAL; |
| 211 | dmap->needs_reorg = 1; |
| 212 | dmap->audio_callback = NULL; |
| 213 | dmap->callback_parm = 0; |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap) |
| 218 | { |
| 219 | unsigned long flags; |
| 220 | |
| 221 | if (dmap->dma >= 0) { |
| 222 | sound_close_dma(dmap->dma); |
| 223 | flags=claim_dma_lock(); |
| 224 | disable_dma(dmap->dma); |
| 225 | release_dma_lock(flags); |
| 226 | } |
| 227 | if (dmap->flags & DMA_BUSY) |
| 228 | dmap->dma_mode = DMODE_NONE; |
| 229 | dmap->flags &= ~DMA_BUSY; |
| 230 | |
| 231 | if (sound_dmap_flag == DMAP_FREE_ON_CLOSE) |
| 232 | sound_free_dmap(dmap); |
| 233 | } |
| 234 | |
| 235 | |
| 236 | static unsigned int default_set_bits(int dev, unsigned int bits) |
| 237 | { |
| 238 | mm_segment_t fs = get_fs(); |
| 239 | |
| 240 | set_fs(get_ds()); |
| 241 | audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (void __user *)&bits); |
| 242 | set_fs(fs); |
| 243 | return bits; |
| 244 | } |
| 245 | |
| 246 | static int default_set_speed(int dev, int speed) |
| 247 | { |
| 248 | mm_segment_t fs = get_fs(); |
| 249 | |
| 250 | set_fs(get_ds()); |
| 251 | audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (void __user *)&speed); |
| 252 | set_fs(fs); |
| 253 | return speed; |
| 254 | } |
| 255 | |
| 256 | static short default_set_channels(int dev, short channels) |
| 257 | { |
| 258 | int c = channels; |
| 259 | mm_segment_t fs = get_fs(); |
| 260 | |
| 261 | set_fs(get_ds()); |
| 262 | audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (void __user *)&c); |
| 263 | set_fs(fs); |
| 264 | return c; |
| 265 | } |
| 266 | |
| 267 | static void check_driver(struct audio_driver *d) |
| 268 | { |
| 269 | if (d->set_speed == NULL) |
| 270 | d->set_speed = default_set_speed; |
| 271 | if (d->set_bits == NULL) |
| 272 | d->set_bits = default_set_bits; |
| 273 | if (d->set_channels == NULL) |
| 274 | d->set_channels = default_set_channels; |
| 275 | } |
| 276 | |
| 277 | int DMAbuf_open(int dev, int mode) |
| 278 | { |
| 279 | struct audio_operations *adev = audio_devs[dev]; |
| 280 | int retval; |
| 281 | struct dma_buffparms *dmap_in = NULL; |
| 282 | struct dma_buffparms *dmap_out = NULL; |
| 283 | |
| 284 | if (!adev) |
| 285 | return -ENXIO; |
| 286 | if (!(adev->flags & DMA_DUPLEX)) |
| 287 | adev->dmap_in = adev->dmap_out; |
| 288 | check_driver(adev->d); |
| 289 | |
| 290 | if ((retval = adev->d->open(dev, mode)) < 0) |
| 291 | return retval; |
| 292 | dmap_out = adev->dmap_out; |
| 293 | dmap_in = adev->dmap_in; |
| 294 | if (dmap_in == dmap_out) |
| 295 | adev->flags &= ~DMA_DUPLEX; |
| 296 | |
| 297 | if (mode & OPEN_WRITE) { |
| 298 | if ((retval = open_dmap(adev, mode, dmap_out)) < 0) { |
| 299 | adev->d->close(dev); |
| 300 | return retval; |
| 301 | } |
| 302 | } |
| 303 | adev->enable_bits = mode; |
| 304 | |
| 305 | if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) { |
| 306 | if ((retval = open_dmap(adev, mode, dmap_in)) < 0) { |
| 307 | adev->d->close(dev); |
| 308 | if (mode & OPEN_WRITE) |
| 309 | close_dmap(adev, dmap_out); |
| 310 | return retval; |
| 311 | } |
| 312 | } |
| 313 | adev->open_mode = mode; |
| 314 | adev->go = 1; |
| 315 | |
| 316 | adev->d->set_bits(dev, 8); |
| 317 | adev->d->set_channels(dev, 1); |
| 318 | adev->d->set_speed(dev, DSP_DEFAULT_SPEED); |
| 319 | if (adev->dmap_out->dma_mode == DMODE_OUTPUT) |
| 320 | memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, |
| 321 | adev->dmap_out->bytes_in_use); |
| 322 | return 0; |
| 323 | } |
| 324 | /* MUST not hold the spinlock */ |
| 325 | void DMAbuf_reset(int dev) |
| 326 | { |
| 327 | if (audio_devs[dev]->open_mode & OPEN_WRITE) |
| 328 | dma_reset_output(dev); |
| 329 | |
| 330 | if (audio_devs[dev]->open_mode & OPEN_READ) |
| 331 | dma_reset_input(dev); |
| 332 | } |
| 333 | |
| 334 | static void dma_reset_output(int dev) |
| 335 | { |
| 336 | struct audio_operations *adev = audio_devs[dev]; |
| 337 | unsigned long flags,f ; |
| 338 | struct dma_buffparms *dmap = adev->dmap_out; |
| 339 | |
| 340 | if (!(dmap->flags & DMA_STARTED)) /* DMA is not active */ |
| 341 | return; |
| 342 | |
| 343 | /* |
| 344 | * First wait until the current fragment has been played completely |
| 345 | */ |
| 346 | spin_lock_irqsave(&dmap->lock,flags); |
| 347 | adev->dmap_out->flags |= DMA_SYNCING; |
| 348 | |
| 349 | adev->dmap_out->underrun_count = 0; |
| 350 | if (!signal_pending(current) && adev->dmap_out->qlen && |
| 351 | adev->dmap_out->underrun_count == 0){ |
| 352 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 353 | interruptible_sleep_on_timeout(&adev->out_sleeper, |
| 354 | dmabuf_timeout(dmap)); |
| 355 | spin_lock_irqsave(&dmap->lock,flags); |
| 356 | } |
| 357 | adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE); |
| 358 | |
| 359 | /* |
| 360 | * Finally shut the device off |
| 361 | */ |
| 362 | if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output) |
| 363 | adev->d->halt_io(dev); |
| 364 | else |
| 365 | adev->d->halt_output(dev); |
| 366 | adev->dmap_out->flags &= ~DMA_STARTED; |
| 367 | |
| 368 | f=claim_dma_lock(); |
| 369 | clear_dma_ff(dmap->dma); |
| 370 | disable_dma(dmap->dma); |
| 371 | release_dma_lock(f); |
| 372 | |
| 373 | dmap->byte_counter = 0; |
| 374 | reorganize_buffers(dev, adev->dmap_out, 0); |
| 375 | dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; |
| 376 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 377 | } |
| 378 | |
| 379 | static void dma_reset_input(int dev) |
| 380 | { |
| 381 | struct audio_operations *adev = audio_devs[dev]; |
| 382 | unsigned long flags; |
| 383 | struct dma_buffparms *dmap = adev->dmap_in; |
| 384 | |
| 385 | spin_lock_irqsave(&dmap->lock,flags); |
| 386 | if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input) |
| 387 | adev->d->halt_io(dev); |
| 388 | else |
| 389 | adev->d->halt_input(dev); |
| 390 | adev->dmap_in->flags &= ~DMA_STARTED; |
| 391 | |
| 392 | dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; |
| 393 | dmap->byte_counter = 0; |
| 394 | reorganize_buffers(dev, adev->dmap_in, 1); |
| 395 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 396 | } |
| 397 | /* MUST be called with holding the dmap->lock */ |
| 398 | void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap) |
| 399 | { |
| 400 | struct audio_operations *adev = audio_devs[dev]; |
| 401 | |
| 402 | if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT)) |
| 403 | return; /* Don't start DMA yet */ |
| 404 | dmap->dma_mode = DMODE_OUTPUT; |
| 405 | |
| 406 | if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) { |
| 407 | if (!(dmap->flags & DMA_STARTED)) { |
| 408 | reorganize_buffers(dev, dmap, 0); |
| 409 | if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs)) |
| 410 | return; |
| 411 | if (!(dmap->flags & DMA_NODMA)) |
| 412 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE); |
| 413 | dmap->flags |= DMA_STARTED; |
| 414 | } |
| 415 | if (dmap->counts[dmap->qhead] == 0) |
| 416 | dmap->counts[dmap->qhead] = dmap->fragment_size; |
| 417 | dmap->dma_mode = DMODE_OUTPUT; |
| 418 | adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size, |
| 419 | dmap->counts[dmap->qhead], 1); |
| 420 | if (adev->d->trigger) |
| 421 | adev->d->trigger(dev,adev->enable_bits * adev->go); |
| 422 | } |
| 423 | dmap->flags |= DMA_ACTIVE; |
| 424 | } |
| 425 | |
| 426 | int DMAbuf_sync(int dev) |
| 427 | { |
| 428 | struct audio_operations *adev = audio_devs[dev]; |
| 429 | unsigned long flags; |
| 430 | int n = 0; |
| 431 | struct dma_buffparms *dmap; |
| 432 | |
| 433 | if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT)) |
| 434 | return 0; |
| 435 | |
| 436 | if (adev->dmap_out->dma_mode == DMODE_OUTPUT) { |
| 437 | dmap = adev->dmap_out; |
| 438 | spin_lock_irqsave(&dmap->lock,flags); |
| 439 | if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE)) |
| 440 | DMAbuf_launch_output(dev, dmap); |
| 441 | adev->dmap_out->flags |= DMA_SYNCING; |
| 442 | adev->dmap_out->underrun_count = 0; |
Roel Kluin | 1afa6e2 | 2009-02-11 13:53:26 +0100 | [diff] [blame] | 443 | while (!signal_pending(current) && n++ < adev->dmap_out->nbufs && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) { |
| 445 | long t = dmabuf_timeout(dmap); |
| 446 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 447 | /* FIXME: not safe may miss events */ |
| 448 | t = interruptible_sleep_on_timeout(&adev->out_sleeper, t); |
| 449 | spin_lock_irqsave(&dmap->lock,flags); |
| 450 | if (!t) { |
| 451 | adev->dmap_out->flags &= ~DMA_SYNCING; |
| 452 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 453 | return adev->dmap_out->qlen; |
| 454 | } |
| 455 | } |
| 456 | adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE); |
| 457 | |
| 458 | /* |
| 459 | * Some devices such as GUS have huge amount of on board RAM for the |
| 460 | * audio data. We have to wait until the device has finished playing. |
| 461 | */ |
| 462 | |
| 463 | /* still holding the lock */ |
| 464 | if (adev->d->local_qlen) { /* Device has hidden buffers */ |
| 465 | while (!signal_pending(current) && |
| 466 | adev->d->local_qlen(dev)){ |
| 467 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 468 | interruptible_sleep_on_timeout(&adev->out_sleeper, |
| 469 | dmabuf_timeout(dmap)); |
| 470 | spin_lock_irqsave(&dmap->lock,flags); |
| 471 | } |
| 472 | } |
| 473 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 474 | } |
| 475 | adev->dmap_out->dma_mode = DMODE_NONE; |
| 476 | return adev->dmap_out->qlen; |
| 477 | } |
| 478 | |
| 479 | int DMAbuf_release(int dev, int mode) |
| 480 | { |
| 481 | struct audio_operations *adev = audio_devs[dev]; |
| 482 | struct dma_buffparms *dmap; |
| 483 | unsigned long flags; |
| 484 | |
| 485 | dmap = adev->dmap_out; |
| 486 | if (adev->open_mode & OPEN_WRITE) |
| 487 | adev->dmap_out->closing = 1; |
| 488 | |
| 489 | if (adev->open_mode & OPEN_READ){ |
| 490 | adev->dmap_in->closing = 1; |
| 491 | dmap = adev->dmap_in; |
| 492 | } |
| 493 | if (adev->open_mode & OPEN_WRITE) |
| 494 | if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED)) |
| 495 | if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT)) |
| 496 | DMAbuf_sync(dev); |
| 497 | if (adev->dmap_out->dma_mode == DMODE_OUTPUT) |
| 498 | memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use); |
| 499 | |
| 500 | DMAbuf_reset(dev); |
| 501 | spin_lock_irqsave(&dmap->lock,flags); |
| 502 | adev->d->close(dev); |
| 503 | |
| 504 | if (adev->open_mode & OPEN_WRITE) |
| 505 | close_dmap(adev, adev->dmap_out); |
| 506 | |
| 507 | if (adev->open_mode == OPEN_READ || |
| 508 | (adev->open_mode != OPEN_WRITE && |
| 509 | (adev->flags & DMA_DUPLEX))) |
| 510 | close_dmap(adev, adev->dmap_in); |
| 511 | adev->open_mode = 0; |
| 512 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 513 | return 0; |
| 514 | } |
| 515 | /* called with dmap->lock dold */ |
| 516 | int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap) |
| 517 | { |
| 518 | struct audio_operations *adev = audio_devs[dev]; |
| 519 | int err; |
| 520 | |
| 521 | if (!(adev->open_mode & OPEN_READ)) |
| 522 | return 0; |
| 523 | if (!(adev->enable_bits & PCM_ENABLE_INPUT)) |
| 524 | return 0; |
| 525 | if (dmap->dma_mode == DMODE_OUTPUT) { /* Direction change */ |
| 526 | /* release lock - it's not recursive */ |
| 527 | spin_unlock_irq(&dmap->lock); |
| 528 | DMAbuf_sync(dev); |
| 529 | DMAbuf_reset(dev); |
| 530 | spin_lock_irq(&dmap->lock); |
| 531 | dmap->dma_mode = DMODE_NONE; |
| 532 | } |
| 533 | if (!dmap->dma_mode) { |
| 534 | reorganize_buffers(dev, dmap, 1); |
| 535 | if ((err = adev->d->prepare_for_input(dev, |
| 536 | dmap->fragment_size, dmap->nbufs)) < 0) |
| 537 | return err; |
| 538 | dmap->dma_mode = DMODE_INPUT; |
| 539 | } |
| 540 | if (!(dmap->flags & DMA_ACTIVE)) { |
| 541 | if (dmap->needs_reorg) |
| 542 | reorganize_buffers(dev, dmap, 0); |
| 543 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); |
| 544 | adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, |
| 545 | dmap->fragment_size, 0); |
| 546 | dmap->flags |= DMA_ACTIVE; |
| 547 | if (adev->d->trigger) |
| 548 | adev->d->trigger(dev, adev->enable_bits * adev->go); |
| 549 | } |
| 550 | return 0; |
| 551 | } |
Adrian Bunk | 0418726 | 2006-06-30 18:23:04 +0200 | [diff] [blame] | 552 | /* acquires lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock) |
| 554 | { |
| 555 | struct audio_operations *adev = audio_devs[dev]; |
| 556 | unsigned long flags; |
| 557 | int err = 0, n = 0; |
| 558 | struct dma_buffparms *dmap = adev->dmap_in; |
| 559 | int go; |
| 560 | |
| 561 | if (!(adev->open_mode & OPEN_READ)) |
| 562 | return -EIO; |
| 563 | spin_lock_irqsave(&dmap->lock,flags); |
| 564 | if (dmap->needs_reorg) |
| 565 | reorganize_buffers(dev, dmap, 0); |
| 566 | if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) { |
| 567 | /* printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/ |
| 568 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 569 | return -EINVAL; |
| 570 | } else while (dmap->qlen <= 0 && n++ < 10) { |
| 571 | long timeout = MAX_SCHEDULE_TIMEOUT; |
| 572 | if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) { |
| 573 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 574 | return -EAGAIN; |
| 575 | } |
| 576 | if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) { |
| 577 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 578 | return err; |
| 579 | } |
| 580 | /* Wait for the next block */ |
| 581 | |
| 582 | if (dontblock) { |
| 583 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 584 | return -EAGAIN; |
| 585 | } |
| 586 | if ((go = adev->go)) |
| 587 | timeout = dmabuf_timeout(dmap); |
| 588 | |
| 589 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 590 | timeout = interruptible_sleep_on_timeout(&adev->in_sleeper, |
| 591 | timeout); |
| 592 | if (!timeout) { |
| 593 | /* FIXME: include device name */ |
| 594 | err = -EIO; |
| 595 | printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n"); |
| 596 | dma_reset_input(dev); |
| 597 | } else |
| 598 | err = -EINTR; |
| 599 | spin_lock_irqsave(&dmap->lock,flags); |
| 600 | } |
| 601 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 602 | |
| 603 | if (dmap->qlen <= 0) |
| 604 | return err ? err : -EINTR; |
| 605 | *buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]]; |
| 606 | *len = dmap->fragment_size - dmap->counts[dmap->qhead]; |
| 607 | |
| 608 | return dmap->qhead; |
| 609 | } |
| 610 | |
| 611 | int DMAbuf_rmchars(int dev, int buff_no, int c) |
| 612 | { |
| 613 | struct audio_operations *adev = audio_devs[dev]; |
| 614 | struct dma_buffparms *dmap = adev->dmap_in; |
| 615 | int p = dmap->counts[dmap->qhead] + c; |
| 616 | |
| 617 | if (dmap->mapping_flags & DMA_MAP_MAPPED) |
| 618 | { |
| 619 | /* printk("Sound: Can't read from mmapped device (2)\n");*/ |
| 620 | return -EINVAL; |
| 621 | } |
| 622 | else if (dmap->qlen <= 0) |
| 623 | return -EIO; |
| 624 | else if (p >= dmap->fragment_size) { /* This buffer is completely empty */ |
| 625 | dmap->counts[dmap->qhead] = 0; |
| 626 | dmap->qlen--; |
| 627 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; |
| 628 | } |
| 629 | else dmap->counts[dmap->qhead] = p; |
| 630 | |
| 631 | return 0; |
| 632 | } |
| 633 | /* MUST be called with dmap->lock hold */ |
| 634 | int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction) |
| 635 | { |
| 636 | /* |
| 637 | * Try to approximate the active byte position of the DMA pointer within the |
| 638 | * buffer area as well as possible. |
| 639 | */ |
| 640 | |
| 641 | int pos; |
| 642 | unsigned long f; |
| 643 | |
| 644 | if (!(dmap->flags & DMA_ACTIVE)) |
| 645 | pos = 0; |
| 646 | else { |
| 647 | int chan = dmap->dma; |
| 648 | |
| 649 | f=claim_dma_lock(); |
| 650 | clear_dma_ff(chan); |
| 651 | |
| 652 | if(!isa_dma_bridge_buggy) |
| 653 | disable_dma(dmap->dma); |
| 654 | |
| 655 | pos = get_dma_residue(chan); |
| 656 | |
| 657 | pos = dmap->bytes_in_use - pos; |
| 658 | |
| 659 | if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) { |
| 660 | if (direction == DMODE_OUTPUT) { |
| 661 | if (dmap->qhead == 0) |
| 662 | if (pos > dmap->fragment_size) |
| 663 | pos = 0; |
| 664 | } else { |
| 665 | if (dmap->qtail == 0) |
| 666 | if (pos > dmap->fragment_size) |
| 667 | pos = 0; |
| 668 | } |
| 669 | } |
| 670 | if (pos < 0) |
| 671 | pos = 0; |
| 672 | if (pos >= dmap->bytes_in_use) |
| 673 | pos = 0; |
| 674 | |
| 675 | if(!isa_dma_bridge_buggy) |
| 676 | enable_dma(dmap->dma); |
| 677 | |
| 678 | release_dma_lock(f); |
| 679 | } |
| 680 | /* printk( "%04x ", pos); */ |
| 681 | |
| 682 | return pos; |
| 683 | } |
| 684 | |
| 685 | /* |
| 686 | * DMAbuf_start_devices() is called by the /dev/music driver to start |
| 687 | * one or more audio devices at desired moment. |
| 688 | */ |
| 689 | |
| 690 | void DMAbuf_start_devices(unsigned int devmask) |
| 691 | { |
| 692 | struct audio_operations *adev; |
| 693 | int dev; |
| 694 | |
| 695 | for (dev = 0; dev < num_audiodevs; dev++) { |
| 696 | if (!(devmask & (1 << dev))) |
| 697 | continue; |
| 698 | if (!(adev = audio_devs[dev])) |
| 699 | continue; |
| 700 | if (adev->open_mode == 0) |
| 701 | continue; |
| 702 | if (adev->go) |
| 703 | continue; |
| 704 | /* OK to start the device */ |
| 705 | adev->go = 1; |
| 706 | if (adev->d->trigger) |
| 707 | adev->d->trigger(dev,adev->enable_bits * adev->go); |
| 708 | } |
| 709 | } |
| 710 | /* via poll called without a lock ?*/ |
| 711 | int DMAbuf_space_in_queue(int dev) |
| 712 | { |
| 713 | struct audio_operations *adev = audio_devs[dev]; |
| 714 | int len, max, tmp; |
| 715 | struct dma_buffparms *dmap = adev->dmap_out; |
| 716 | int lim = dmap->nbufs; |
| 717 | |
| 718 | if (lim < 2) |
| 719 | lim = 2; |
| 720 | |
| 721 | if (dmap->qlen >= lim) /* No space at all */ |
| 722 | return 0; |
| 723 | |
| 724 | /* |
| 725 | * Verify that there are no more pending buffers than the limit |
| 726 | * defined by the process. |
| 727 | */ |
| 728 | |
| 729 | max = dmap->max_fragments; |
| 730 | if (max > lim) |
| 731 | max = lim; |
| 732 | len = dmap->qlen; |
| 733 | |
| 734 | if (adev->d->local_qlen) { |
| 735 | tmp = adev->d->local_qlen(dev); |
| 736 | if (tmp && len) |
| 737 | tmp--; /* This buffer has been counted twice */ |
| 738 | len += tmp; |
| 739 | } |
| 740 | if (dmap->byte_counter % dmap->fragment_size) /* There is a partial fragment */ |
| 741 | len = len + 1; |
| 742 | |
| 743 | if (len >= max) |
| 744 | return 0; |
| 745 | return max - len; |
| 746 | } |
| 747 | /* MUST not hold the spinlock - this function may sleep */ |
| 748 | static int output_sleep(int dev, int dontblock) |
| 749 | { |
| 750 | struct audio_operations *adev = audio_devs[dev]; |
| 751 | int err = 0; |
| 752 | struct dma_buffparms *dmap = adev->dmap_out; |
| 753 | long timeout; |
| 754 | long timeout_value; |
| 755 | |
| 756 | if (dontblock) |
| 757 | return -EAGAIN; |
| 758 | if (!(adev->enable_bits & PCM_ENABLE_OUTPUT)) |
| 759 | return -EAGAIN; |
| 760 | |
| 761 | /* |
| 762 | * Wait for free space |
| 763 | */ |
| 764 | if (signal_pending(current)) |
| 765 | return -EINTR; |
| 766 | timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT)); |
| 767 | if (timeout) |
| 768 | timeout_value = dmabuf_timeout(dmap); |
| 769 | else |
| 770 | timeout_value = MAX_SCHEDULE_TIMEOUT; |
| 771 | timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper, |
| 772 | timeout_value); |
| 773 | if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) { |
| 774 | printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n"); |
| 775 | dma_reset_output(dev); |
| 776 | } else { |
| 777 | if (signal_pending(current)) |
| 778 | err = -EINTR; |
| 779 | } |
| 780 | return err; |
| 781 | } |
| 782 | /* called with the lock held */ |
| 783 | static int find_output_space(int dev, char **buf, int *size) |
| 784 | { |
| 785 | struct audio_operations *adev = audio_devs[dev]; |
| 786 | struct dma_buffparms *dmap = adev->dmap_out; |
| 787 | unsigned long active_offs; |
| 788 | long len, offs; |
| 789 | int maxfrags; |
| 790 | int occupied_bytes = (dmap->user_counter % dmap->fragment_size); |
| 791 | |
| 792 | *buf = dmap->raw_buf; |
| 793 | if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes) |
| 794 | return 0; |
| 795 | |
| 796 | #ifdef BE_CONSERVATIVE |
| 797 | active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size; |
| 798 | #else |
Roel Kluin | 0d52cea4 | 2008-04-18 12:25:41 +0200 | [diff] [blame] | 799 | active_offs = max(DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | /* Check for pointer wrapping situation */ |
Roel Kluin | 0d52cea4 | 2008-04-18 12:25:41 +0200 | [diff] [blame] | 801 | if (active_offs >= dmap->bytes_in_use) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | active_offs = 0; |
| 803 | active_offs += dmap->byte_counter; |
| 804 | #endif |
| 805 | |
| 806 | offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP; |
| 807 | if (offs < 0 || offs >= dmap->bytes_in_use) { |
| 808 | printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs); |
| 809 | printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use); |
| 810 | return 0; |
| 811 | } |
| 812 | *buf = dmap->raw_buf + offs; |
| 813 | |
| 814 | len = active_offs + dmap->bytes_in_use - dmap->user_counter; /* Number of unused bytes in buffer */ |
| 815 | |
| 816 | if ((offs + len) > dmap->bytes_in_use) |
| 817 | len = dmap->bytes_in_use - offs; |
| 818 | if (len < 0) { |
| 819 | return 0; |
| 820 | } |
| 821 | if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes)) |
| 822 | len = (maxfrags * dmap->fragment_size) - occupied_bytes; |
| 823 | *size = len & ~SAMPLE_ROUNDUP; |
| 824 | return (*size > 0); |
| 825 | } |
Adrian Bunk | 0418726 | 2006-06-30 18:23:04 +0200 | [diff] [blame] | 826 | /* acquires lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock) |
| 828 | { |
| 829 | struct audio_operations *adev = audio_devs[dev]; |
| 830 | unsigned long flags; |
| 831 | int err = -EIO; |
| 832 | struct dma_buffparms *dmap = adev->dmap_out; |
| 833 | |
| 834 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { |
| 835 | /* printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/ |
| 836 | return -EINVAL; |
| 837 | } |
| 838 | spin_lock_irqsave(&dmap->lock,flags); |
| 839 | if (dmap->needs_reorg) |
| 840 | reorganize_buffers(dev, dmap, 0); |
| 841 | |
| 842 | if (dmap->dma_mode == DMODE_INPUT) { /* Direction change */ |
| 843 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 844 | DMAbuf_reset(dev); |
| 845 | spin_lock_irqsave(&dmap->lock,flags); |
| 846 | } |
| 847 | dmap->dma_mode = DMODE_OUTPUT; |
| 848 | |
| 849 | while (find_output_space(dev, buf, size) <= 0) { |
| 850 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 851 | if ((err = output_sleep(dev, dontblock)) < 0) { |
| 852 | return err; |
| 853 | } |
| 854 | spin_lock_irqsave(&dmap->lock,flags); |
| 855 | } |
| 856 | |
| 857 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 858 | return 0; |
| 859 | } |
Adrian Bunk | 0418726 | 2006-06-30 18:23:04 +0200 | [diff] [blame] | 860 | /* has to acquire dmap->lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | int DMAbuf_move_wrpointer(int dev, int l) |
| 862 | { |
| 863 | struct audio_operations *adev = audio_devs[dev]; |
| 864 | struct dma_buffparms *dmap = adev->dmap_out; |
| 865 | unsigned long ptr; |
| 866 | unsigned long end_ptr, p; |
| 867 | int post; |
| 868 | unsigned long flags; |
| 869 | |
| 870 | spin_lock_irqsave(&dmap->lock,flags); |
| 871 | post= (dmap->flags & DMA_POST); |
| 872 | ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; |
| 873 | |
| 874 | dmap->flags &= ~DMA_POST; |
| 875 | dmap->cfrag = -1; |
| 876 | dmap->user_counter += l; |
| 877 | dmap->flags |= DMA_DIRTY; |
| 878 | |
| 879 | if (dmap->byte_counter >= dmap->max_byte_counter) { |
| 880 | /* Wrap the byte counters */ |
| 881 | long decr = dmap->byte_counter; |
| 882 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); |
| 883 | decr -= dmap->byte_counter; |
| 884 | dmap->user_counter -= decr; |
| 885 | } |
| 886 | end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; |
| 887 | |
| 888 | p = (dmap->user_counter - 1) % dmap->bytes_in_use; |
| 889 | dmap->neutral_byte = dmap->raw_buf[p]; |
| 890 | |
| 891 | /* Update the fragment based bookkeeping too */ |
| 892 | while (ptr < end_ptr) { |
| 893 | dmap->counts[dmap->qtail] = dmap->fragment_size; |
| 894 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; |
| 895 | dmap->qlen++; |
| 896 | ptr += dmap->fragment_size; |
| 897 | } |
| 898 | |
| 899 | dmap->counts[dmap->qtail] = dmap->user_counter - ptr; |
| 900 | |
| 901 | /* |
| 902 | * Let the low level driver perform some postprocessing to |
| 903 | * the written data. |
| 904 | */ |
| 905 | if (adev->d->postprocess_write) |
| 906 | adev->d->postprocess_write(dev); |
| 907 | |
| 908 | if (!(dmap->flags & DMA_ACTIVE)) |
| 909 | if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1))) |
| 910 | DMAbuf_launch_output(dev, dmap); |
| 911 | |
| 912 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode) |
| 917 | { |
| 918 | struct audio_operations *adev = audio_devs[dev]; |
| 919 | struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; |
| 920 | |
| 921 | if (dmap->raw_buf == NULL) { |
| 922 | printk(KERN_ERR "sound: DMA buffer(1) == NULL\n"); |
| 923 | printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in"); |
| 924 | return 0; |
| 925 | } |
| 926 | if (dmap->dma < 0) |
| 927 | return 0; |
| 928 | sound_start_dma(dmap, physaddr, count, dma_mode); |
| 929 | return count; |
| 930 | } |
Adrian Bunk | ece7f77 | 2006-10-04 02:17:31 -0700 | [diff] [blame] | 931 | EXPORT_SYMBOL(DMAbuf_start_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | |
| 933 | static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode) |
| 934 | { |
| 935 | struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; |
| 936 | |
| 937 | if (dmap->raw_buf == NULL) { |
| 938 | printk(KERN_ERR "sound: DMA buffer(2) == NULL\n"); |
| 939 | printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in"); |
| 940 | return 0; |
| 941 | } |
| 942 | if (dmap->flags & DMA_NODMA) |
| 943 | return 1; |
| 944 | if (dmap->dma < 0) |
| 945 | return 0; |
| 946 | sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT); |
| 947 | dmap->flags |= DMA_STARTED; |
| 948 | return count; |
| 949 | } |
| 950 | |
| 951 | static void finish_output_interrupt(int dev, struct dma_buffparms *dmap) |
| 952 | { |
| 953 | struct audio_operations *adev = audio_devs[dev]; |
| 954 | |
| 955 | if (dmap->audio_callback != NULL) |
| 956 | dmap->audio_callback(dev, dmap->callback_parm); |
| 957 | wake_up(&adev->out_sleeper); |
| 958 | wake_up(&adev->poll_sleeper); |
| 959 | } |
| 960 | /* called with dmap->lock held in irq context*/ |
| 961 | static void do_outputintr(int dev, int dummy) |
| 962 | { |
| 963 | struct audio_operations *adev = audio_devs[dev]; |
| 964 | struct dma_buffparms *dmap = adev->dmap_out; |
| 965 | int this_fragment; |
| 966 | |
| 967 | if (dmap->raw_buf == NULL) { |
| 968 | printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev); |
| 969 | return; |
| 970 | } |
| 971 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { /* Virtual memory mapped access */ |
| 972 | /* mmapped access */ |
| 973 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; |
| 974 | if (dmap->qhead == 0) { /* Wrapped */ |
| 975 | dmap->byte_counter += dmap->bytes_in_use; |
| 976 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ |
| 977 | long decr = dmap->byte_counter; |
| 978 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); |
| 979 | decr -= dmap->byte_counter; |
| 980 | dmap->user_counter -= decr; |
| 981 | } |
| 982 | } |
| 983 | dmap->qlen++; /* Yes increment it (don't decrement) */ |
| 984 | if (!(adev->flags & DMA_AUTOMODE)) |
| 985 | dmap->flags &= ~DMA_ACTIVE; |
| 986 | dmap->counts[dmap->qhead] = dmap->fragment_size; |
| 987 | DMAbuf_launch_output(dev, dmap); |
| 988 | finish_output_interrupt(dev, dmap); |
| 989 | return; |
| 990 | } |
| 991 | |
| 992 | dmap->qlen--; |
| 993 | this_fragment = dmap->qhead; |
| 994 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; |
| 995 | |
| 996 | if (dmap->qhead == 0) { /* Wrapped */ |
| 997 | dmap->byte_counter += dmap->bytes_in_use; |
| 998 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ |
| 999 | long decr = dmap->byte_counter; |
| 1000 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); |
| 1001 | decr -= dmap->byte_counter; |
| 1002 | dmap->user_counter -= decr; |
| 1003 | } |
| 1004 | } |
| 1005 | if (!(adev->flags & DMA_AUTOMODE)) |
| 1006 | dmap->flags &= ~DMA_ACTIVE; |
| 1007 | |
| 1008 | /* |
| 1009 | * This is dmap->qlen <= 0 except when closing when |
| 1010 | * dmap->qlen < 0 |
| 1011 | */ |
| 1012 | |
| 1013 | while (dmap->qlen <= -dmap->closing) { |
| 1014 | dmap->underrun_count++; |
| 1015 | dmap->qlen++; |
| 1016 | if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) { |
| 1017 | dmap->flags &= ~DMA_DIRTY; |
| 1018 | memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, |
| 1019 | adev->dmap_out->buffsize); |
| 1020 | } |
| 1021 | dmap->user_counter += dmap->fragment_size; |
| 1022 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; |
| 1023 | } |
| 1024 | if (dmap->qlen > 0) |
| 1025 | DMAbuf_launch_output(dev, dmap); |
| 1026 | finish_output_interrupt(dev, dmap); |
| 1027 | } |
| 1028 | /* called in irq context */ |
| 1029 | void DMAbuf_outputintr(int dev, int notify_only) |
| 1030 | { |
| 1031 | struct audio_operations *adev = audio_devs[dev]; |
| 1032 | unsigned long flags; |
| 1033 | struct dma_buffparms *dmap = adev->dmap_out; |
| 1034 | |
| 1035 | spin_lock_irqsave(&dmap->lock,flags); |
| 1036 | if (!(dmap->flags & DMA_NODMA)) { |
| 1037 | int chan = dmap->dma, pos, n; |
| 1038 | unsigned long f; |
| 1039 | |
| 1040 | f=claim_dma_lock(); |
| 1041 | |
| 1042 | if(!isa_dma_bridge_buggy) |
| 1043 | disable_dma(dmap->dma); |
| 1044 | clear_dma_ff(chan); |
| 1045 | pos = dmap->bytes_in_use - get_dma_residue(chan); |
| 1046 | if(!isa_dma_bridge_buggy) |
| 1047 | enable_dma(dmap->dma); |
| 1048 | release_dma_lock(f); |
| 1049 | |
| 1050 | pos = pos / dmap->fragment_size; /* Actual qhead */ |
| 1051 | if (pos < 0 || pos >= dmap->nbufs) |
| 1052 | pos = 0; |
| 1053 | n = 0; |
| 1054 | while (dmap->qhead != pos && n++ < dmap->nbufs) |
| 1055 | do_outputintr(dev, notify_only); |
| 1056 | } |
| 1057 | else |
| 1058 | do_outputintr(dev, notify_only); |
| 1059 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 1060 | } |
Adrian Bunk | ece7f77 | 2006-10-04 02:17:31 -0700 | [diff] [blame] | 1061 | EXPORT_SYMBOL(DMAbuf_outputintr); |
| 1062 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | /* called with dmap->lock held in irq context */ |
| 1064 | static void do_inputintr(int dev) |
| 1065 | { |
| 1066 | struct audio_operations *adev = audio_devs[dev]; |
| 1067 | struct dma_buffparms *dmap = adev->dmap_in; |
| 1068 | |
| 1069 | if (dmap->raw_buf == NULL) { |
| 1070 | printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n"); |
| 1071 | return; |
| 1072 | } |
| 1073 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { |
| 1074 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; |
| 1075 | if (dmap->qtail == 0) { /* Wrapped */ |
| 1076 | dmap->byte_counter += dmap->bytes_in_use; |
| 1077 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ |
| 1078 | long decr = dmap->byte_counter; |
| 1079 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; |
| 1080 | decr -= dmap->byte_counter; |
| 1081 | dmap->user_counter -= decr; |
| 1082 | } |
| 1083 | } |
| 1084 | dmap->qlen++; |
| 1085 | |
| 1086 | if (!(adev->flags & DMA_AUTOMODE)) { |
| 1087 | if (dmap->needs_reorg) |
| 1088 | reorganize_buffers(dev, dmap, 0); |
| 1089 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ); |
| 1090 | adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, |
| 1091 | dmap->fragment_size, 1); |
| 1092 | if (adev->d->trigger) |
| 1093 | adev->d->trigger(dev, adev->enable_bits * adev->go); |
| 1094 | } |
| 1095 | dmap->flags |= DMA_ACTIVE; |
| 1096 | } else if (dmap->qlen >= (dmap->nbufs - 1)) { |
| 1097 | printk(KERN_WARNING "Sound: Recording overrun\n"); |
| 1098 | dmap->underrun_count++; |
| 1099 | |
| 1100 | /* Just throw away the oldest fragment but keep the engine running */ |
| 1101 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; |
| 1102 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; |
| 1103 | } else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) { |
| 1104 | dmap->qlen++; |
| 1105 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; |
| 1106 | if (dmap->qtail == 0) { /* Wrapped */ |
| 1107 | dmap->byte_counter += dmap->bytes_in_use; |
| 1108 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ |
| 1109 | long decr = dmap->byte_counter; |
| 1110 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; |
| 1111 | decr -= dmap->byte_counter; |
| 1112 | dmap->user_counter -= decr; |
| 1113 | } |
| 1114 | } |
| 1115 | } |
| 1116 | if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) { |
| 1117 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); |
| 1118 | adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1); |
| 1119 | if (adev->d->trigger) |
| 1120 | adev->d->trigger(dev,adev->enable_bits * adev->go); |
| 1121 | } |
| 1122 | dmap->flags |= DMA_ACTIVE; |
| 1123 | if (dmap->qlen > 0) |
| 1124 | { |
| 1125 | wake_up(&adev->in_sleeper); |
| 1126 | wake_up(&adev->poll_sleeper); |
| 1127 | } |
| 1128 | } |
| 1129 | /* called in irq context */ |
| 1130 | void DMAbuf_inputintr(int dev) |
| 1131 | { |
| 1132 | struct audio_operations *adev = audio_devs[dev]; |
| 1133 | struct dma_buffparms *dmap = adev->dmap_in; |
| 1134 | unsigned long flags; |
| 1135 | |
| 1136 | spin_lock_irqsave(&dmap->lock,flags); |
| 1137 | |
| 1138 | if (!(dmap->flags & DMA_NODMA)) { |
| 1139 | int chan = dmap->dma, pos, n; |
| 1140 | unsigned long f; |
| 1141 | |
| 1142 | f=claim_dma_lock(); |
| 1143 | if(!isa_dma_bridge_buggy) |
| 1144 | disable_dma(dmap->dma); |
| 1145 | clear_dma_ff(chan); |
| 1146 | pos = dmap->bytes_in_use - get_dma_residue(chan); |
| 1147 | if(!isa_dma_bridge_buggy) |
| 1148 | enable_dma(dmap->dma); |
| 1149 | release_dma_lock(f); |
| 1150 | |
| 1151 | pos = pos / dmap->fragment_size; /* Actual qhead */ |
| 1152 | if (pos < 0 || pos >= dmap->nbufs) |
| 1153 | pos = 0; |
| 1154 | |
| 1155 | n = 0; |
| 1156 | while (dmap->qtail != pos && ++n < dmap->nbufs) |
| 1157 | do_inputintr(dev); |
| 1158 | } else |
| 1159 | do_inputintr(dev); |
| 1160 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 1161 | } |
Adrian Bunk | ece7f77 | 2006-10-04 02:17:31 -0700 | [diff] [blame] | 1162 | EXPORT_SYMBOL(DMAbuf_inputintr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | void DMAbuf_init(int dev, int dma1, int dma2) |
| 1165 | { |
| 1166 | struct audio_operations *adev = audio_devs[dev]; |
| 1167 | /* |
| 1168 | * NOTE! This routine could be called several times. |
| 1169 | */ |
| 1170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | if (adev && adev->dmap_out == NULL) { |
| 1172 | if (adev->d == NULL) |
| 1173 | panic("OSS: audio_devs[%d]->d == NULL\n", dev); |
| 1174 | |
| 1175 | if (adev->parent_dev) { /* Use DMA map of the parent dev */ |
| 1176 | int parent = adev->parent_dev - 1; |
| 1177 | adev->dmap_out = audio_devs[parent]->dmap_out; |
| 1178 | adev->dmap_in = audio_devs[parent]->dmap_in; |
| 1179 | } else { |
| 1180 | adev->dmap_out = adev->dmap_in = &adev->dmaps[0]; |
| 1181 | adev->dmap_out->dma = dma1; |
| 1182 | if (adev->flags & DMA_DUPLEX) { |
| 1183 | adev->dmap_in = &adev->dmaps[1]; |
| 1184 | adev->dmap_in->dma = dma2; |
| 1185 | } |
| 1186 | } |
| 1187 | /* Persistent DMA buffers allocated here */ |
| 1188 | if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { |
| 1189 | if (adev->dmap_in->raw_buf == NULL) |
| 1190 | sound_alloc_dmap(adev->dmap_in); |
| 1191 | if (adev->dmap_out->raw_buf == NULL) |
| 1192 | sound_alloc_dmap(adev->dmap_out); |
| 1193 | } |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | /* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */ |
| 1198 | static unsigned int poll_input(struct file * file, int dev, poll_table *wait) |
| 1199 | { |
| 1200 | struct audio_operations *adev = audio_devs[dev]; |
| 1201 | struct dma_buffparms *dmap = adev->dmap_in; |
| 1202 | |
| 1203 | if (!(adev->open_mode & OPEN_READ)) |
| 1204 | return 0; |
| 1205 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { |
| 1206 | if (dmap->qlen) |
| 1207 | return POLLIN | POLLRDNORM; |
| 1208 | return 0; |
| 1209 | } |
| 1210 | if (dmap->dma_mode != DMODE_INPUT) { |
| 1211 | if (dmap->dma_mode == DMODE_NONE && |
| 1212 | adev->enable_bits & PCM_ENABLE_INPUT && |
| 1213 | !dmap->qlen && adev->go) { |
| 1214 | unsigned long flags; |
| 1215 | |
| 1216 | spin_lock_irqsave(&dmap->lock,flags); |
| 1217 | DMAbuf_activate_recording(dev, dmap); |
| 1218 | spin_unlock_irqrestore(&dmap->lock,flags); |
| 1219 | } |
| 1220 | return 0; |
| 1221 | } |
| 1222 | if (!dmap->qlen) |
| 1223 | return 0; |
| 1224 | return POLLIN | POLLRDNORM; |
| 1225 | } |
| 1226 | |
| 1227 | static unsigned int poll_output(struct file * file, int dev, poll_table *wait) |
| 1228 | { |
| 1229 | struct audio_operations *adev = audio_devs[dev]; |
| 1230 | struct dma_buffparms *dmap = adev->dmap_out; |
| 1231 | |
| 1232 | if (!(adev->open_mode & OPEN_WRITE)) |
| 1233 | return 0; |
| 1234 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { |
| 1235 | if (dmap->qlen) |
| 1236 | return POLLOUT | POLLWRNORM; |
| 1237 | return 0; |
| 1238 | } |
| 1239 | if (dmap->dma_mode == DMODE_INPUT) |
| 1240 | return 0; |
| 1241 | if (dmap->dma_mode == DMODE_NONE) |
| 1242 | return POLLOUT | POLLWRNORM; |
| 1243 | if (!DMAbuf_space_in_queue(dev)) |
| 1244 | return 0; |
| 1245 | return POLLOUT | POLLWRNORM; |
| 1246 | } |
| 1247 | |
| 1248 | unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait) |
| 1249 | { |
| 1250 | struct audio_operations *adev = audio_devs[dev]; |
| 1251 | poll_wait(file, &adev->poll_sleeper, wait); |
| 1252 | return poll_input(file, dev, wait) | poll_output(file, dev, wait); |
| 1253 | } |
| 1254 | |
| 1255 | void DMAbuf_deinit(int dev) |
| 1256 | { |
| 1257 | struct audio_operations *adev = audio_devs[dev]; |
| 1258 | /* This routine is called when driver is being unloaded */ |
| 1259 | if (!adev) |
| 1260 | return; |
| 1261 | |
| 1262 | /* Persistent DMA buffers deallocated here */ |
| 1263 | if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { |
| 1264 | sound_free_dmap(adev->dmap_out); |
| 1265 | if (adev->flags & DMA_DUPLEX) |
| 1266 | sound_free_dmap(adev->dmap_in); |
| 1267 | } |
| 1268 | } |