1 /* 2 * Au12x0/Au1550 PSC ALSA ASoC audio support. 3 * 4 * (c) 2007-2008 MSC Vertriebsges.m.b.H., 5 * Manuel Lauss <manuel.lauss@gmail.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * DMA glue for Au1x-PSC audio. 12 * 13 * NOTE: all of these drivers can only work with a SINGLE instance 14 * of a PSC. Multiple independent audio devices are impossible 15 * with ASoC v1. 16 */ 17 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/platform_device.h> 22 #include <linux/slab.h> 23 #include <linux/dma-mapping.h> 24 25 #include <sound/core.h> 26 #include <sound/pcm.h> 27 #include <sound/pcm_params.h> 28 #include <sound/soc.h> 29 30 #include <asm/mach-au1x00/au1000.h> 31 #include <asm/mach-au1x00/au1xxx_dbdma.h> 32 #include <asm/mach-au1x00/au1xxx_psc.h> 33 34 #include "psc.h" 35 36 /*#define PCM_DEBUG*/ 37 38 #define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x) 39 #ifdef PCM_DEBUG 40 #define DBG MSG 41 #else 42 #define DBG(x...) do {} while (0) 43 #endif 44 45 struct au1xpsc_audio_dmadata { 46 /* DDMA control data */ 47 unsigned int ddma_id; /* DDMA direction ID for this PSC */ 48 u32 ddma_chan; /* DDMA context */ 49 50 /* PCM context (for irq handlers) */ 51 struct snd_pcm_substream *substream; 52 unsigned long curr_period; /* current segment DDMA is working on */ 53 unsigned long q_period; /* queue period(s) */ 54 unsigned long dma_area; /* address of queued DMA area */ 55 unsigned long dma_area_s; /* start address of DMA area */ 56 unsigned long pos; /* current byte position being played */ 57 unsigned long periods; /* number of SG segments in total */ 58 unsigned long period_bytes; /* size in bytes of one SG segment */ 59 60 /* runtime data */ 61 int msbits; 62 }; 63 64 /* instance data. There can be only one, MacLeod!!!! */ 65 static struct au1xpsc_audio_dmadata *au1xpsc_audio_pcmdma[2]; 66 67 /* 68 * These settings are somewhat okay, at least on my machine audio plays 69 * almost skip-free. Especially the 64kB buffer seems to help a LOT. 70 */ 71 #define AU1XPSC_PERIOD_MIN_BYTES 1024 72 #define AU1XPSC_BUFFER_MIN_BYTES 65536 73 74 #define AU1XPSC_PCM_FMTS \ 75 (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \ 76 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \ 77 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE | \ 78 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | \ 79 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE | \ 80 0) 81 82 /* PCM hardware DMA capabilities - platform specific */ 83 static const struct snd_pcm_hardware au1xpsc_pcm_hardware = { 84 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 85 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH, 86 .formats = AU1XPSC_PCM_FMTS, 87 .period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES, 88 .period_bytes_max = 4096 * 1024 - 1, 89 .periods_min = 2, 90 .periods_max = 4096, /* 2 to as-much-as-you-like */ 91 .buffer_bytes_max = 4096 * 1024 - 1, 92 .fifo_size = 16, /* fifo entries of AC97/I2S PSC */ 93 }; 94 95 static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd) 96 { 97 au1xxx_dbdma_put_source(cd->ddma_chan, 98 (void *)phys_to_virt(cd->dma_area), 99 cd->period_bytes, DDMA_FLAGS_IE); 100 101 /* update next-to-queue period */ 102 ++cd->q_period; 103 cd->dma_area += cd->period_bytes; 104 if (cd->q_period >= cd->periods) { 105 cd->q_period = 0; 106 cd->dma_area = cd->dma_area_s; 107 } 108 } 109 110 static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd) 111 { 112 au1xxx_dbdma_put_dest(cd->ddma_chan, 113 (void *)phys_to_virt(cd->dma_area), 114 cd->period_bytes, DDMA_FLAGS_IE); 115 116 /* update next-to-queue period */ 117 ++cd->q_period; 118 cd->dma_area += cd->period_bytes; 119 if (cd->q_period >= cd->periods) { 120 cd->q_period = 0; 121 cd->dma_area = cd->dma_area_s; 122 } 123 } 124 125 static void au1x_pcm_dmatx_cb(int irq, void *dev_id) 126 { 127 struct au1xpsc_audio_dmadata *cd = dev_id; 128 129 cd->pos += cd->period_bytes; 130 if (++cd->curr_period >= cd->periods) { 131 cd->pos = 0; 132 cd->curr_period = 0; 133 } 134 snd_pcm_period_elapsed(cd->substream); 135 au1x_pcm_queue_tx(cd); 136 } 137 138 static void au1x_pcm_dmarx_cb(int irq, void *dev_id) 139 { 140 struct au1xpsc_audio_dmadata *cd = dev_id; 141 142 cd->pos += cd->period_bytes; 143 if (++cd->curr_period >= cd->periods) { 144 cd->pos = 0; 145 cd->curr_period = 0; 146 } 147 snd_pcm_period_elapsed(cd->substream); 148 au1x_pcm_queue_rx(cd); 149 } 150 151 static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd) 152 { 153 if (pcd->ddma_chan) { 154 au1xxx_dbdma_stop(pcd->ddma_chan); 155 au1xxx_dbdma_reset(pcd->ddma_chan); 156 au1xxx_dbdma_chan_free(pcd->ddma_chan); 157 pcd->ddma_chan = 0; 158 pcd->msbits = 0; 159 } 160 } 161 162 /* in case of missing DMA ring or changed TX-source / RX-dest bit widths, 163 * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according 164 * to ALSA-supplied sample depth. This is due to limitations in the dbdma api 165 * (cannot adjust source/dest widths of already allocated descriptor ring). 166 */ 167 static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd, 168 int stype, int msbits) 169 { 170 /* DMA only in 8/16/32 bit widths */ 171 if (msbits == 24) 172 msbits = 32; 173 174 /* check current config: correct bits and descriptors allocated? */ 175 if ((pcd->ddma_chan) && (msbits == pcd->msbits)) 176 goto out; /* all ok! */ 177 178 au1x_pcm_dbdma_free(pcd); 179 180 if (stype == PCM_RX) 181 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id, 182 DSCR_CMD0_ALWAYS, 183 au1x_pcm_dmarx_cb, (void *)pcd); 184 else 185 pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS, 186 pcd->ddma_id, 187 au1x_pcm_dmatx_cb, (void *)pcd); 188 189 if (!pcd->ddma_chan) 190 return -ENOMEM; 191 192 au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits); 193 au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2); 194 195 pcd->msbits = msbits; 196 197 au1xxx_dbdma_stop(pcd->ddma_chan); 198 au1xxx_dbdma_reset(pcd->ddma_chan); 199 200 out: 201 return 0; 202 } 203 204 static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream, 205 struct snd_pcm_hw_params *params) 206 { 207 struct snd_pcm_runtime *runtime = substream->runtime; 208 struct au1xpsc_audio_dmadata *pcd; 209 int stype, ret; 210 211 ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); 212 if (ret < 0) 213 goto out; 214 215 stype = SUBSTREAM_TYPE(substream); 216 pcd = au1xpsc_audio_pcmdma[stype]; 217 218 DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d " 219 "runtime->min_align %d\n", 220 (unsigned long)runtime->dma_area, 221 (unsigned long)runtime->dma_addr, runtime->dma_bytes, 222 runtime->min_align); 223 224 DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits, 225 params_periods(params), params_period_bytes(params), stype); 226 227 ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits); 228 if (ret) { 229 MSG("DDMA channel (re)alloc failed!\n"); 230 goto out; 231 } 232 233 pcd->substream = substream; 234 pcd->period_bytes = params_period_bytes(params); 235 pcd->periods = params_periods(params); 236 pcd->dma_area_s = pcd->dma_area = (unsigned long)runtime->dma_addr; 237 pcd->q_period = 0; 238 pcd->curr_period = 0; 239 pcd->pos = 0; 240 241 ret = 0; 242 out: 243 return ret; 244 } 245 246 static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream) 247 { 248 snd_pcm_lib_free_pages(substream); 249 return 0; 250 } 251 252 static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream) 253 { 254 struct au1xpsc_audio_dmadata *pcd = 255 au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]; 256 257 au1xxx_dbdma_reset(pcd->ddma_chan); 258 259 if (SUBSTREAM_TYPE(substream) == PCM_RX) { 260 au1x_pcm_queue_rx(pcd); 261 au1x_pcm_queue_rx(pcd); 262 } else { 263 au1x_pcm_queue_tx(pcd); 264 au1x_pcm_queue_tx(pcd); 265 } 266 267 return 0; 268 } 269 270 static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 271 { 272 u32 c = au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->ddma_chan; 273 274 switch (cmd) { 275 case SNDRV_PCM_TRIGGER_START: 276 case SNDRV_PCM_TRIGGER_RESUME: 277 au1xxx_dbdma_start(c); 278 break; 279 case SNDRV_PCM_TRIGGER_STOP: 280 case SNDRV_PCM_TRIGGER_SUSPEND: 281 au1xxx_dbdma_stop(c); 282 break; 283 default: 284 return -EINVAL; 285 } 286 return 0; 287 } 288 289 static snd_pcm_uframes_t 290 au1xpsc_pcm_pointer(struct snd_pcm_substream *substream) 291 { 292 return bytes_to_frames(substream->runtime, 293 au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->pos); 294 } 295 296 static int au1xpsc_pcm_open(struct snd_pcm_substream *substream) 297 { 298 snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware); 299 return 0; 300 } 301 302 static int au1xpsc_pcm_close(struct snd_pcm_substream *substream) 303 { 304 au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]); 305 return 0; 306 } 307 308 static struct snd_pcm_ops au1xpsc_pcm_ops = { 309 .open = au1xpsc_pcm_open, 310 .close = au1xpsc_pcm_close, 311 .ioctl = snd_pcm_lib_ioctl, 312 .hw_params = au1xpsc_pcm_hw_params, 313 .hw_free = au1xpsc_pcm_hw_free, 314 .prepare = au1xpsc_pcm_prepare, 315 .trigger = au1xpsc_pcm_trigger, 316 .pointer = au1xpsc_pcm_pointer, 317 }; 318 319 static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm) 320 { 321 snd_pcm_lib_preallocate_free_for_all(pcm); 322 } 323 324 static int au1xpsc_pcm_new(struct snd_card *card, 325 struct snd_soc_dai *dai, 326 struct snd_pcm *pcm) 327 { 328 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 329 card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1); 330 331 return 0; 332 } 333 334 static int au1xpsc_pcm_probe(struct platform_device *pdev) 335 { 336 if (!au1xpsc_audio_pcmdma[PCM_TX] || !au1xpsc_audio_pcmdma[PCM_RX]) 337 return -ENODEV; 338 339 return 0; 340 } 341 342 static int au1xpsc_pcm_remove(struct platform_device *pdev) 343 { 344 return 0; 345 } 346 347 /* au1xpsc audio platform */ 348 struct snd_soc_platform au1xpsc_soc_platform = { 349 .name = "au1xpsc-pcm-dbdma", 350 .probe = au1xpsc_pcm_probe, 351 .remove = au1xpsc_pcm_remove, 352 .pcm_ops = &au1xpsc_pcm_ops, 353 .pcm_new = au1xpsc_pcm_new, 354 .pcm_free = au1xpsc_pcm_free_dma_buffers, 355 }; 356 EXPORT_SYMBOL_GPL(au1xpsc_soc_platform); 357 358 static int __devinit au1xpsc_pcm_drvprobe(struct platform_device *pdev) 359 { 360 struct resource *r; 361 int ret; 362 363 if (au1xpsc_audio_pcmdma[PCM_TX] || au1xpsc_audio_pcmdma[PCM_RX]) 364 return -EBUSY; 365 366 /* TX DMA */ 367 au1xpsc_audio_pcmdma[PCM_TX] 368 = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL); 369 if (!au1xpsc_audio_pcmdma[PCM_TX]) 370 return -ENOMEM; 371 372 r = platform_get_resource(pdev, IORESOURCE_DMA, 0); 373 if (!r) { 374 ret = -ENODEV; 375 goto out1; 376 } 377 (au1xpsc_audio_pcmdma[PCM_TX])->ddma_id = r->start; 378 379 /* RX DMA */ 380 au1xpsc_audio_pcmdma[PCM_RX] 381 = kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL); 382 if (!au1xpsc_audio_pcmdma[PCM_RX]) 383 return -ENOMEM; 384 385 r = platform_get_resource(pdev, IORESOURCE_DMA, 1); 386 if (!r) { 387 ret = -ENODEV; 388 goto out2; 389 } 390 (au1xpsc_audio_pcmdma[PCM_RX])->ddma_id = r->start; 391 392 ret = snd_soc_register_platform(&au1xpsc_soc_platform); 393 if (!ret) 394 return ret; 395 396 out2: 397 kfree(au1xpsc_audio_pcmdma[PCM_RX]); 398 au1xpsc_audio_pcmdma[PCM_RX] = NULL; 399 out1: 400 kfree(au1xpsc_audio_pcmdma[PCM_TX]); 401 au1xpsc_audio_pcmdma[PCM_TX] = NULL; 402 return ret; 403 } 404 405 static int __devexit au1xpsc_pcm_drvremove(struct platform_device *pdev) 406 { 407 int i; 408 409 snd_soc_unregister_platform(&au1xpsc_soc_platform); 410 411 for (i = 0; i < 2; i++) { 412 if (au1xpsc_audio_pcmdma[i]) { 413 au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[i]); 414 kfree(au1xpsc_audio_pcmdma[i]); 415 au1xpsc_audio_pcmdma[i] = NULL; 416 } 417 } 418 419 return 0; 420 } 421 422 static struct platform_driver au1xpsc_pcm_driver = { 423 .driver = { 424 .name = "au1xpsc-pcm", 425 .owner = THIS_MODULE, 426 }, 427 .probe = au1xpsc_pcm_drvprobe, 428 .remove = __devexit_p(au1xpsc_pcm_drvremove), 429 }; 430 431 static int __init au1xpsc_audio_dbdma_load(void) 432 { 433 au1xpsc_audio_pcmdma[PCM_TX] = NULL; 434 au1xpsc_audio_pcmdma[PCM_RX] = NULL; 435 return platform_driver_register(&au1xpsc_pcm_driver); 436 } 437 438 static void __exit au1xpsc_audio_dbdma_unload(void) 439 { 440 platform_driver_unregister(&au1xpsc_pcm_driver); 441 } 442 443 module_init(au1xpsc_audio_dbdma_load); 444 module_exit(au1xpsc_audio_dbdma_unload); 445 446 447 struct platform_device *au1xpsc_pcm_add(struct platform_device *pdev) 448 { 449 struct resource *res, *r; 450 struct platform_device *pd; 451 int id[2]; 452 int ret; 453 454 r = platform_get_resource(pdev, IORESOURCE_DMA, 0); 455 if (!r) 456 return NULL; 457 id[0] = r->start; 458 459 r = platform_get_resource(pdev, IORESOURCE_DMA, 1); 460 if (!r) 461 return NULL; 462 id[1] = r->start; 463 464 res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL); 465 if (!res) 466 return NULL; 467 468 res[0].start = res[0].end = id[0]; 469 res[1].start = res[1].end = id[1]; 470 res[0].flags = res[1].flags = IORESOURCE_DMA; 471 472 pd = platform_device_alloc("au1xpsc-pcm", -1); 473 if (!pd) 474 goto out; 475 476 pd->resource = res; 477 pd->num_resources = 2; 478 479 ret = platform_device_add(pd); 480 if (!ret) 481 return pd; 482 483 platform_device_put(pd); 484 out: 485 kfree(res); 486 return NULL; 487 } 488 EXPORT_SYMBOL_GPL(au1xpsc_pcm_add); 489 490 void au1xpsc_pcm_destroy(struct platform_device *dmapd) 491 { 492 if (dmapd) 493 platform_device_unregister(dmapd); 494 } 495 EXPORT_SYMBOL_GPL(au1xpsc_pcm_destroy); 496 497 MODULE_LICENSE("GPL"); 498 MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver"); 499 MODULE_AUTHOR("Manuel Lauss"); 500