1/* 2 * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip 3 * 4 * Author: Nicolas Pitre 5 * Created: Nov 30, 2004 6 * Copyright: (C) 2004 MontaVista Software, Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13#include <linux/module.h> 14#include <linux/init.h> 15#include <linux/device.h> 16#include <linux/slab.h> 17#include <linux/dma-mapping.h> 18 19#include <sound/driver.h> 20#include <sound/core.h> 21#include <sound/pcm.h> 22#include <sound/pcm_params.h> 23 24#include <asm/dma.h> 25#include <asm/hardware.h> 26#include <asm/arch/pxa-regs.h> 27 28#include "pxa2xx-pcm.h" 29 30 31static const struct snd_pcm_hardware pxa2xx_pcm_hardware = { 32 .info = SNDRV_PCM_INFO_MMAP | 33 SNDRV_PCM_INFO_MMAP_VALID | 34 SNDRV_PCM_INFO_INTERLEAVED | 35 SNDRV_PCM_INFO_PAUSE, 36 .formats = SNDRV_PCM_FMTBIT_S16_LE, 37 .period_bytes_min = 32, 38 .period_bytes_max = 8192 - 32, 39 .periods_min = 1, 40 .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc), 41 .buffer_bytes_max = 128 * 1024, 42 .fifo_size = 32, 43}; 44 45struct pxa2xx_runtime_data { 46 int dma_ch; 47 struct pxa2xx_pcm_dma_params *params; 48 pxa_dma_desc *dma_desc_array; 49 dma_addr_t dma_desc_array_phys; 50}; 51 52static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, 53 struct snd_pcm_hw_params *params) 54{ 55 struct snd_pcm_runtime *runtime = substream->runtime; 56 struct pxa2xx_runtime_data *rtd = runtime->private_data; 57 size_t totsize = params_buffer_bytes(params); 58 size_t period = params_period_bytes(params); 59 pxa_dma_desc *dma_desc; 60 dma_addr_t dma_buff_phys, next_desc_phys; 61 62 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 63 runtime->dma_bytes = totsize; 64 65 dma_desc = rtd->dma_desc_array; 66 next_desc_phys = rtd->dma_desc_array_phys; 67 dma_buff_phys = runtime->dma_addr; 68 do { 69 next_desc_phys += sizeof(pxa_dma_desc); 70 dma_desc->ddadr = next_desc_phys; 71 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 72 dma_desc->dsadr = dma_buff_phys; 73 dma_desc->dtadr = rtd->params->dev_addr; 74 } else { 75 dma_desc->dsadr = rtd->params->dev_addr; 76 dma_desc->dtadr = dma_buff_phys; 77 } 78 if (period > totsize) 79 period = totsize; 80 dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN; 81 dma_desc++; 82 dma_buff_phys += period; 83 } while (totsize -= period); 84 dma_desc[-1].ddadr = rtd->dma_desc_array_phys; 85 86 return 0; 87} 88 89static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) 90{ 91 struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; 92 93 *rtd->params->drcmr = 0; 94 snd_pcm_set_runtime_buffer(substream, NULL); 95 return 0; 96} 97 98static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) 99{ 100 struct pxa2xx_pcm_client *client = substream->private_data; 101 struct snd_pcm_runtime *runtime = substream->runtime; 102 struct pxa2xx_runtime_data *rtd = runtime->private_data; 103 104 DCSR(rtd->dma_ch) &= ~DCSR_RUN; 105 DCSR(rtd->dma_ch) = 0; 106 DCMD(rtd->dma_ch) = 0; 107 *rtd->params->drcmr = rtd->dma_ch | DRCMR_MAPVLD; 108 109 return client->prepare(substream); 110} 111 112static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 113{ 114 struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; 115 int ret = 0; 116 117 switch (cmd) { 118 case SNDRV_PCM_TRIGGER_START: 119 DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys; 120 DCSR(rtd->dma_ch) = DCSR_RUN; 121 break; 122 123 case SNDRV_PCM_TRIGGER_STOP: 124 case SNDRV_PCM_TRIGGER_SUSPEND: 125 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 126 DCSR(rtd->dma_ch) &= ~DCSR_RUN; 127 break; 128 129 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 130 DCSR(rtd->dma_ch) |= DCSR_RUN; 131 break; 132 133 default: 134 ret = -EINVAL; 135 } 136 137 return ret; 138} 139 140static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id) 141{ 142 struct snd_pcm_substream *substream = dev_id; 143 struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; 144 int dcsr; 145 146 dcsr = DCSR(dma_ch); 147 DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN; 148 149 if (dcsr & DCSR_ENDINTR) { 150 snd_pcm_period_elapsed(substream); 151 } else { 152 printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n", 153 rtd->params->name, dma_ch, dcsr ); 154 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 155 } 156} 157 158static snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) 159{ 160 struct snd_pcm_runtime *runtime = substream->runtime; 161 struct pxa2xx_runtime_data *rtd = runtime->private_data; 162 dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 163 DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch); 164 snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr); 165 if (x == runtime->buffer_size) 166 x = 0; 167 return x; 168} 169 170static int 171pxa2xx_pcm_hw_rule_mult32(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) 172{ 173 struct snd_interval *i = hw_param_interval(params, rule->var); 174 int changed = 0; 175 176 if (i->min & 31) { 177 i->min = (i->min & ~31) + 32; 178 i->openmin = 0; 179 changed = 1; 180 } 181 182 if (i->max & 31) { 183 i->max &= ~31; 184 i->openmax = 0; 185 changed = 1; 186 } 187 188 return changed; 189} 190 191static int pxa2xx_pcm_open(struct snd_pcm_substream *substream) 192{ 193 struct pxa2xx_pcm_client *client = substream->private_data; 194 struct snd_pcm_runtime *runtime = substream->runtime; 195 struct pxa2xx_runtime_data *rtd; 196 int ret; 197 198 runtime->hw = pxa2xx_pcm_hardware; 199 200 /* 201 * For mysterious reasons (and despite what the manual says) 202 * playback samples are lost if the DMA count is not a multiple 203 * of the DMA burst size. Let's add a rule to enforce that. 204 */ 205 ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 206 pxa2xx_pcm_hw_rule_mult32, NULL, 207 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1); 208 if (ret) 209 goto out; 210 ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 211 pxa2xx_pcm_hw_rule_mult32, NULL, 212 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 213 if (ret) 214 goto out; 215 216 ret = -ENOMEM; 217 rtd = kmalloc(sizeof(*rtd), GFP_KERNEL); 218 if (!rtd) 219 goto out; 220 rtd->dma_desc_array = 221 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE, 222 &rtd->dma_desc_array_phys, GFP_KERNEL); 223 if (!rtd->dma_desc_array) 224 goto err1; 225 226 rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 227 client->playback_params : client->capture_params; 228 ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW, 229 pxa2xx_pcm_dma_irq, substream); 230 if (ret < 0) 231 goto err2; 232 rtd->dma_ch = ret; 233 234 runtime->private_data = rtd; 235 ret = client->startup(substream); 236 if (!ret) 237 goto out; 238 239 pxa_free_dma(rtd->dma_ch); 240 err2: 241 dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE, 242 rtd->dma_desc_array, rtd->dma_desc_array_phys); 243 err1: 244 kfree(rtd); 245 out: 246 return ret; 247} 248 249static int pxa2xx_pcm_close(struct snd_pcm_substream *substream) 250{ 251 struct pxa2xx_pcm_client *client = substream->private_data; 252 struct pxa2xx_runtime_data *rtd = substream->runtime->private_data; 253 254 pxa_free_dma(rtd->dma_ch); 255 client->shutdown(substream); 256 dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE, 257 rtd->dma_desc_array, rtd->dma_desc_array_phys); 258 kfree(rtd); 259 return 0; 260} 261 262static int 263pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma) 264{ 265 struct snd_pcm_runtime *runtime = substream->runtime; 266 return dma_mmap_writecombine(substream->pcm->card->dev, vma, 267 runtime->dma_area, 268 runtime->dma_addr, 269 runtime->dma_bytes); 270} 271 272static struct snd_pcm_ops pxa2xx_pcm_ops = { 273 .open = pxa2xx_pcm_open, 274 .close = pxa2xx_pcm_close, 275 .ioctl = snd_pcm_lib_ioctl, 276 .hw_params = pxa2xx_pcm_hw_params, 277 .hw_free = pxa2xx_pcm_hw_free, 278 .prepare = pxa2xx_pcm_prepare, 279 .trigger = pxa2xx_pcm_trigger, 280 .pointer = pxa2xx_pcm_pointer, 281 .mmap = pxa2xx_pcm_mmap, 282}; 283 284static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) 285{ 286 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 287 struct snd_dma_buffer *buf = &substream->dma_buffer; 288 size_t size = pxa2xx_pcm_hardware.buffer_bytes_max; 289 buf->dev.type = SNDRV_DMA_TYPE_DEV; 290 buf->dev.dev = pcm->card->dev; 291 buf->private_data = NULL; 292 buf->area = dma_alloc_writecombine(pcm->card->dev, size, 293 &buf->addr, GFP_KERNEL); 294 if (!buf->area) 295 return -ENOMEM; 296 buf->bytes = size; 297 return 0; 298} 299 300static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm) 301{ 302 struct snd_pcm_substream *substream; 303 struct snd_dma_buffer *buf; 304 int stream; 305 306 for (stream = 0; stream < 2; stream++) { 307 substream = pcm->streams[stream].substream; 308 if (!substream) 309 continue; 310 buf = &substream->dma_buffer; 311 if (!buf->area) 312 continue; 313 dma_free_writecombine(pcm->card->dev, buf->bytes, 314 buf->area, buf->addr); 315 buf->area = NULL; 316 } 317} 318 319static u64 pxa2xx_pcm_dmamask = 0xffffffff; 320 321int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client, 322 struct snd_pcm **rpcm) 323{ 324 struct snd_pcm *pcm; 325 int play = client->playback_params ? 1 : 0; 326 int capt = client->capture_params ? 1 : 0; 327 int ret; 328 329 ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm); 330 if (ret) 331 goto out; 332 333 pcm->private_data = client; 334 pcm->private_free = pxa2xx_pcm_free_dma_buffers; 335 336 if (!card->dev->dma_mask) 337 card->dev->dma_mask = &pxa2xx_pcm_dmamask; 338 if (!card->dev->coherent_dma_mask) 339 card->dev->coherent_dma_mask = 0xffffffff; 340 341 if (play) { 342 int stream = SNDRV_PCM_STREAM_PLAYBACK; 343 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops); 344 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream); 345 if (ret) 346 goto out; 347 } 348 if (capt) { 349 int stream = SNDRV_PCM_STREAM_CAPTURE; 350 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops); 351 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream); 352 if (ret) 353 goto out; 354 } 355 356 if (rpcm) 357 *rpcm = pcm; 358 ret = 0; 359 360 out: 361 return ret; 362} 363 364EXPORT_SYMBOL(pxa2xx_pcm_new); 365 366MODULE_AUTHOR("Nicolas Pitre"); 367MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); 368MODULE_LICENSE("GPL"); 369