Liam Girdwood | f11a96d | 2006-10-12 14:26:55 +0200 | [diff] [blame] | 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/platform_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 | #include <sound/soc.h> |
| 24 | |
| 25 | #include <asm/dma.h> |
| 26 | #include <asm/hardware.h> |
| 27 | #include <asm/arch/pxa-regs.h> |
| 28 | #include <asm/arch/audio.h> |
| 29 | |
| 30 | #include "pxa2xx-pcm.h" |
| 31 | |
| 32 | static const struct snd_pcm_hardware pxa2xx_pcm_hardware = { |
| 33 | .info = SNDRV_PCM_INFO_MMAP | |
| 34 | SNDRV_PCM_INFO_MMAP_VALID | |
| 35 | SNDRV_PCM_INFO_INTERLEAVED | |
| 36 | SNDRV_PCM_INFO_PAUSE | |
| 37 | SNDRV_PCM_INFO_RESUME, |
| 38 | .formats = SNDRV_PCM_FMTBIT_S16_LE | |
| 39 | SNDRV_PCM_FMTBIT_S24_LE | |
| 40 | SNDRV_PCM_FMTBIT_S32_LE, |
| 41 | .period_bytes_min = 32, |
| 42 | .period_bytes_max = 8192 - 32, |
| 43 | .periods_min = 1, |
| 44 | .periods_max = PAGE_SIZE/sizeof(pxa_dma_desc), |
| 45 | .buffer_bytes_max = 128 * 1024, |
| 46 | .fifo_size = 32, |
| 47 | }; |
| 48 | |
| 49 | struct pxa2xx_runtime_data { |
| 50 | int dma_ch; |
| 51 | struct pxa2xx_pcm_dma_params *params; |
| 52 | pxa_dma_desc *dma_desc_array; |
| 53 | dma_addr_t dma_desc_array_phys; |
| 54 | }; |
| 55 | |
| 56 | static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id) |
| 57 | { |
| 58 | struct snd_pcm_substream *substream = dev_id; |
| 59 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; |
| 60 | int dcsr; |
| 61 | |
| 62 | dcsr = DCSR(dma_ch); |
| 63 | DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN; |
| 64 | |
| 65 | if (dcsr & DCSR_ENDINTR) { |
| 66 | snd_pcm_period_elapsed(substream); |
| 67 | } else { |
| 68 | printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n", |
| 69 | prtd->params->name, dma_ch, dcsr ); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream, |
| 74 | struct snd_pcm_hw_params *params) |
| 75 | { |
| 76 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 77 | struct pxa2xx_runtime_data *prtd = runtime->private_data; |
| 78 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
Andrew Johnson | a8f5d0a | 2007-02-02 17:21:50 +0100 | [diff] [blame] | 79 | struct pxa2xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data; |
Liam Girdwood | f11a96d | 2006-10-12 14:26:55 +0200 | [diff] [blame] | 80 | size_t totsize = params_buffer_bytes(params); |
| 81 | size_t period = params_period_bytes(params); |
| 82 | pxa_dma_desc *dma_desc; |
| 83 | dma_addr_t dma_buff_phys, next_desc_phys; |
| 84 | int ret; |
| 85 | |
Andrew Johnson | a8f5d0a | 2007-02-02 17:21:50 +0100 | [diff] [blame] | 86 | /* return if this is a bufferless transfer e.g. |
| 87 | * codec <--> BT codec or GSM modem -- lg FIXME */ |
| 88 | if (!dma) |
| 89 | return 0; |
| 90 | |
Liam Girdwood | f11a96d | 2006-10-12 14:26:55 +0200 | [diff] [blame] | 91 | /* this may get called several times by oss emulation |
| 92 | * with different params */ |
| 93 | if (prtd->params == NULL) { |
| 94 | prtd->params = dma; |
| 95 | ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, |
| 96 | pxa2xx_pcm_dma_irq, substream); |
| 97 | if (ret < 0) |
| 98 | return ret; |
| 99 | prtd->dma_ch = ret; |
| 100 | } else if (prtd->params != dma) { |
| 101 | pxa_free_dma(prtd->dma_ch); |
| 102 | prtd->params = dma; |
| 103 | ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW, |
| 104 | pxa2xx_pcm_dma_irq, substream); |
| 105 | if (ret < 0) |
| 106 | return ret; |
| 107 | prtd->dma_ch = ret; |
| 108 | } |
| 109 | |
| 110 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 111 | runtime->dma_bytes = totsize; |
| 112 | |
| 113 | dma_desc = prtd->dma_desc_array; |
| 114 | next_desc_phys = prtd->dma_desc_array_phys; |
| 115 | dma_buff_phys = runtime->dma_addr; |
| 116 | do { |
| 117 | next_desc_phys += sizeof(pxa_dma_desc); |
| 118 | dma_desc->ddadr = next_desc_phys; |
| 119 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| 120 | dma_desc->dsadr = dma_buff_phys; |
| 121 | dma_desc->dtadr = prtd->params->dev_addr; |
| 122 | } else { |
| 123 | dma_desc->dsadr = prtd->params->dev_addr; |
| 124 | dma_desc->dtadr = dma_buff_phys; |
| 125 | } |
| 126 | if (period > totsize) |
| 127 | period = totsize; |
| 128 | dma_desc->dcmd = prtd->params->dcmd | period | DCMD_ENDIRQEN; |
| 129 | dma_desc++; |
| 130 | dma_buff_phys += period; |
| 131 | } while (totsize -= period); |
| 132 | dma_desc[-1].ddadr = prtd->dma_desc_array_phys; |
| 133 | |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream) |
| 138 | { |
| 139 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; |
| 140 | |
| 141 | if (prtd && prtd->params) |
| 142 | *prtd->params->drcmr = 0; |
| 143 | |
| 144 | if (prtd->dma_ch) { |
| 145 | snd_pcm_set_runtime_buffer(substream, NULL); |
| 146 | pxa_free_dma(prtd->dma_ch); |
| 147 | prtd->dma_ch = 0; |
| 148 | } |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream) |
| 154 | { |
| 155 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; |
| 156 | |
| 157 | DCSR(prtd->dma_ch) &= ~DCSR_RUN; |
| 158 | DCSR(prtd->dma_ch) = 0; |
| 159 | DCMD(prtd->dma_ch) = 0; |
| 160 | *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD; |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 166 | { |
| 167 | struct pxa2xx_runtime_data *prtd = substream->runtime->private_data; |
| 168 | int ret = 0; |
| 169 | |
| 170 | switch (cmd) { |
| 171 | case SNDRV_PCM_TRIGGER_START: |
| 172 | DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; |
| 173 | DCSR(prtd->dma_ch) = DCSR_RUN; |
| 174 | break; |
| 175 | |
| 176 | case SNDRV_PCM_TRIGGER_STOP: |
| 177 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 178 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 179 | DCSR(prtd->dma_ch) &= ~DCSR_RUN; |
| 180 | break; |
| 181 | |
| 182 | case SNDRV_PCM_TRIGGER_RESUME: |
| 183 | DCSR(prtd->dma_ch) |= DCSR_RUN; |
| 184 | break; |
| 185 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 186 | DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys; |
| 187 | DCSR(prtd->dma_ch) |= DCSR_RUN; |
| 188 | break; |
| 189 | |
| 190 | default: |
| 191 | ret = -EINVAL; |
| 192 | } |
| 193 | |
| 194 | return ret; |
| 195 | } |
| 196 | |
| 197 | static snd_pcm_uframes_t |
| 198 | pxa2xx_pcm_pointer(struct snd_pcm_substream *substream) |
| 199 | { |
| 200 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 201 | struct pxa2xx_runtime_data *prtd = runtime->private_data; |
| 202 | |
| 203 | dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? |
| 204 | DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch); |
| 205 | snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr); |
| 206 | |
| 207 | if (x == runtime->buffer_size) |
| 208 | x = 0; |
| 209 | return x; |
| 210 | } |
| 211 | |
| 212 | static int pxa2xx_pcm_open(struct snd_pcm_substream *substream) |
| 213 | { |
| 214 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 215 | struct pxa2xx_runtime_data *prtd; |
| 216 | int ret; |
| 217 | |
| 218 | snd_soc_set_runtime_hwparams(substream, &pxa2xx_pcm_hardware); |
| 219 | |
| 220 | /* |
| 221 | * For mysterious reasons (and despite what the manual says) |
| 222 | * playback samples are lost if the DMA count is not a multiple |
| 223 | * of the DMA burst size. Let's add a rule to enforce that. |
| 224 | */ |
| 225 | ret = snd_pcm_hw_constraint_step(runtime, 0, |
| 226 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32); |
| 227 | if (ret) |
| 228 | goto out; |
| 229 | |
| 230 | ret = snd_pcm_hw_constraint_step(runtime, 0, |
| 231 | SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32); |
| 232 | if (ret) |
| 233 | goto out; |
| 234 | |
Andrew Johnson | a8f5d0a | 2007-02-02 17:21:50 +0100 | [diff] [blame] | 235 | ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); |
| 236 | if (ret < 0) |
| 237 | goto out; |
| 238 | |
Liam Girdwood | f11a96d | 2006-10-12 14:26:55 +0200 | [diff] [blame] | 239 | prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL); |
| 240 | if (prtd == NULL) { |
| 241 | ret = -ENOMEM; |
| 242 | goto out; |
| 243 | } |
| 244 | |
| 245 | prtd->dma_desc_array = |
| 246 | dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE, |
| 247 | &prtd->dma_desc_array_phys, GFP_KERNEL); |
| 248 | if (!prtd->dma_desc_array) { |
| 249 | ret = -ENOMEM; |
| 250 | goto err1; |
| 251 | } |
| 252 | |
| 253 | runtime->private_data = prtd; |
| 254 | return 0; |
| 255 | |
| 256 | err1: |
| 257 | kfree(prtd); |
| 258 | out: |
| 259 | return ret; |
| 260 | } |
| 261 | |
| 262 | static int pxa2xx_pcm_close(struct snd_pcm_substream *substream) |
| 263 | { |
| 264 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 265 | struct pxa2xx_runtime_data *prtd = runtime->private_data; |
| 266 | |
| 267 | dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE, |
| 268 | prtd->dma_desc_array, prtd->dma_desc_array_phys); |
| 269 | kfree(prtd); |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | static int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, |
| 274 | struct vm_area_struct *vma) |
| 275 | { |
| 276 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 277 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| 278 | runtime->dma_area, |
| 279 | runtime->dma_addr, |
| 280 | runtime->dma_bytes); |
| 281 | } |
| 282 | |
| 283 | struct snd_pcm_ops pxa2xx_pcm_ops = { |
| 284 | .open = pxa2xx_pcm_open, |
| 285 | .close = pxa2xx_pcm_close, |
| 286 | .ioctl = snd_pcm_lib_ioctl, |
| 287 | .hw_params = pxa2xx_pcm_hw_params, |
| 288 | .hw_free = pxa2xx_pcm_hw_free, |
| 289 | .prepare = pxa2xx_pcm_prepare, |
| 290 | .trigger = pxa2xx_pcm_trigger, |
| 291 | .pointer = pxa2xx_pcm_pointer, |
| 292 | .mmap = pxa2xx_pcm_mmap, |
| 293 | }; |
| 294 | |
| 295 | static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| 296 | { |
| 297 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| 298 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 299 | size_t size = pxa2xx_pcm_hardware.buffer_bytes_max; |
| 300 | buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| 301 | buf->dev.dev = pcm->card->dev; |
| 302 | buf->private_data = NULL; |
| 303 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| 304 | &buf->addr, GFP_KERNEL); |
| 305 | if (!buf->area) |
| 306 | return -ENOMEM; |
| 307 | buf->bytes = size; |
| 308 | return 0; |
| 309 | } |
| 310 | |
| 311 | static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm) |
| 312 | { |
| 313 | struct snd_pcm_substream *substream; |
| 314 | struct snd_dma_buffer *buf; |
| 315 | int stream; |
| 316 | |
| 317 | for (stream = 0; stream < 2; stream++) { |
| 318 | substream = pcm->streams[stream].substream; |
| 319 | if (!substream) |
| 320 | continue; |
| 321 | |
| 322 | buf = &substream->dma_buffer; |
| 323 | if (!buf->area) |
| 324 | continue; |
| 325 | |
| 326 | dma_free_writecombine(pcm->card->dev, buf->bytes, |
| 327 | buf->area, buf->addr); |
| 328 | buf->area = NULL; |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK; |
| 333 | |
| 334 | int pxa2xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai, |
| 335 | struct snd_pcm *pcm) |
| 336 | { |
| 337 | int ret = 0; |
| 338 | |
| 339 | if (!card->dev->dma_mask) |
| 340 | card->dev->dma_mask = &pxa2xx_pcm_dmamask; |
| 341 | if (!card->dev->coherent_dma_mask) |
| 342 | card->dev->coherent_dma_mask = DMA_32BIT_MASK; |
| 343 | |
| 344 | if (dai->playback.channels_min) { |
| 345 | ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, |
| 346 | SNDRV_PCM_STREAM_PLAYBACK); |
| 347 | if (ret) |
| 348 | goto out; |
| 349 | } |
| 350 | |
| 351 | if (dai->capture.channels_min) { |
| 352 | ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, |
| 353 | SNDRV_PCM_STREAM_CAPTURE); |
| 354 | if (ret) |
| 355 | goto out; |
| 356 | } |
| 357 | out: |
| 358 | return ret; |
| 359 | } |
| 360 | |
| 361 | struct snd_soc_platform pxa2xx_soc_platform = { |
| 362 | .name = "pxa2xx-audio", |
| 363 | .pcm_ops = &pxa2xx_pcm_ops, |
| 364 | .pcm_new = pxa2xx_pcm_new, |
| 365 | .pcm_free = pxa2xx_pcm_free_dma_buffers, |
| 366 | }; |
| 367 | |
| 368 | EXPORT_SYMBOL_GPL(pxa2xx_soc_platform); |
| 369 | |
| 370 | MODULE_AUTHOR("Nicolas Pitre"); |
| 371 | MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); |
| 372 | MODULE_LICENSE("GPL"); |