sound/soc/pxa/pxa2xx-pcm.c

   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;
  79         struct pxa2xx_pcm_dma_params *dma = rtd->cpu_dai->dma_data;
  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
  86         /* this may get called several times by oss emulation
  87          * with different params */
  88         if (prtd->params == NULL) {
  89                 prtd->params = dma;
  90                 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  91                               pxa2xx_pcm_dma_irq, substream);
  92                 if (ret < 0)
  93                         return ret;
  94                 prtd->dma_ch = ret;
  95         } else if (prtd->params != dma) {
  96                 pxa_free_dma(prtd->dma_ch);
  97                 prtd->params = dma;
  98                 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  99                               pxa2xx_pcm_dma_irq, substream);
 100                 if (ret < 0)
 101                         return ret;
 102                 prtd->dma_ch = ret;
 103         }
 104
 105         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 106         runtime->dma_bytes = totsize;
 107
 108         dma_desc = prtd->dma_desc_array;
 109         next_desc_phys = prtd->dma_desc_array_phys;
 110         dma_buff_phys = runtime->dma_addr;
 111         do {
 112                 next_desc_phys += sizeof(pxa_dma_desc);
 113                 dma_desc->ddadr = next_desc_phys;
 114                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 115                         dma_desc->dsadr = dma_buff_phys;
 116                         dma_desc->dtadr = prtd->params->dev_addr;
 117                 } else {
 118                         dma_desc->dsadr = prtd->params->dev_addr;
 119                         dma_desc->dtadr = dma_buff_phys;
 120                 }
 121                 if (period > totsize)
 122                         period = totsize;
 123                 dma_desc->dcmd = prtd->params->dcmd | period | DCMD_ENDIRQEN;
 124                 dma_desc++;
 125                 dma_buff_phys += period;
 126         } while (totsize -= period);
 127         dma_desc[-1].ddadr = prtd->dma_desc_array_phys;
 128
 129         return 0;
 130 }
 131
 132 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
 133 {
 134         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
 135
 136         if (prtd && prtd->params)
 137                 *prtd->params->drcmr = 0;
 138
 139         if (prtd->dma_ch) {
 140                 snd_pcm_set_runtime_buffer(substream, NULL);
 141                 pxa_free_dma(prtd->dma_ch);
 142                 prtd->dma_ch = 0;
 143         }
 144
 145         return 0;
 146 }
 147
 148 static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
 149 {
 150         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
 151
 152         DCSR(prtd->dma_ch) &= ~DCSR_RUN;
 153         DCSR(prtd->dma_ch) = 0;
 154         DCMD(prtd->dma_ch) = 0;
 155         *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
 156
 157         return 0;
 158 }
 159
 160 static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 161 {
 162         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
 163         int ret = 0;
 164
 165         switch (cmd) {
 166         case SNDRV_PCM_TRIGGER_START:
 167                 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
 168                 DCSR(prtd->dma_ch) = DCSR_RUN;
 169                 break;
 170
 171         case SNDRV_PCM_TRIGGER_STOP:
 172         case SNDRV_PCM_TRIGGER_SUSPEND:
 173         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 174                 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
 175                 break;
 176
 177         case SNDRV_PCM_TRIGGER_RESUME:
 178                 DCSR(prtd->dma_ch) |= DCSR_RUN;
 179                 break;
 180         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 181                 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
 182                 DCSR(prtd->dma_ch) |= DCSR_RUN;
 183                 break;
 184
 185         default:
 186                 ret = -EINVAL;
 187         }
 188
 189         return ret;
 190 }
 191
 192 static snd_pcm_uframes_t
 193 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
 194 {
 195         struct snd_pcm_runtime *runtime = substream->runtime;
 196         struct pxa2xx_runtime_data *prtd = runtime->private_data;
 197
 198         dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 199                          DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
 200         snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 201
 202         if (x == runtime->buffer_size)
 203                 x = 0;
 204         return x;
 205 }
 206
 207 static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
 208 {
 209         struct snd_pcm_runtime *runtime = substream->runtime;
 210         struct pxa2xx_runtime_data *prtd;
 211         int ret;
 212
 213         snd_soc_set_runtime_hwparams(substream, &pxa2xx_pcm_hardware);
 214
 215         /*
 216          * For mysterious reasons (and despite what the manual says)
 217          * playback samples are lost if the DMA count is not a multiple
 218          * of the DMA burst size.  Let's add a rule to enforce that.
 219          */
 220         ret = snd_pcm_hw_constraint_step(runtime, 0,
 221                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
 222         if (ret)
 223                 goto out;
 224
 225         ret = snd_pcm_hw_constraint_step(runtime, 0,
 226                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
 227         if (ret)
 228                 goto out;
 229
 230         prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL);
 231         if (prtd == NULL) {
 232                 ret = -ENOMEM;
 233                 goto out;
 234         }
 235
 236         prtd->dma_desc_array =
 237                 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 238                                        &prtd->dma_desc_array_phys, GFP_KERNEL);
 239         if (!prtd->dma_desc_array) {
 240                 ret = -ENOMEM;
 241                 goto err1;
 242         }
 243
 244         runtime->private_data = prtd;
 245         return 0;
 246
 247  err1:
 248         kfree(prtd);
 249  out:
 250         return ret;
 251 }
 252
 253 static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
 254 {
 255         struct snd_pcm_runtime *runtime = substream->runtime;
 256         struct pxa2xx_runtime_data *prtd = runtime->private_data;
 257
 258         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 259                               prtd->dma_desc_array, prtd->dma_desc_array_phys);
 260         kfree(prtd);
 261         return 0;
 262 }
 263
 264 static int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
 265         struct vm_area_struct *vma)
 266 {
 267         struct snd_pcm_runtime *runtime = substream->runtime;
 268         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 269                                      runtime->dma_area,
 270                                      runtime->dma_addr,
 271                                      runtime->dma_bytes);
 272 }
 273
 274 struct snd_pcm_ops pxa2xx_pcm_ops = {
 275         .open           = pxa2xx_pcm_open,
 276         .close          = pxa2xx_pcm_close,
 277         .ioctl          = snd_pcm_lib_ioctl,
 278         .hw_params      = pxa2xx_pcm_hw_params,
 279         .hw_free        = pxa2xx_pcm_hw_free,
 280         .prepare        = pxa2xx_pcm_prepare,
 281         .trigger        = pxa2xx_pcm_trigger,
 282         .pointer        = pxa2xx_pcm_pointer,
 283         .mmap           = pxa2xx_pcm_mmap,
 284 };
 285
 286 static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 287 {
 288         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 289         struct snd_dma_buffer *buf = &substream->dma_buffer;
 290         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
 291         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 292         buf->dev.dev = pcm->card->dev;
 293         buf->private_data = NULL;
 294         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 295                                            &buf->addr, GFP_KERNEL);
 296         if (!buf->area)
 297                 return -ENOMEM;
 298         buf->bytes = size;
 299         return 0;
 300 }
 301
 302 static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 303 {
 304         struct snd_pcm_substream *substream;
 305         struct snd_dma_buffer *buf;
 306         int stream;
 307
 308         for (stream = 0; stream < 2; stream++) {
 309                 substream = pcm->streams[stream].substream;
 310                 if (!substream)
 311                         continue;
 312
 313                 buf = &substream->dma_buffer;
 314                 if (!buf->area)
 315                         continue;
 316
 317                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 318                                       buf->area, buf->addr);
 319                 buf->area = NULL;
 320         }
 321 }
 322
 323 static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK;
 324
 325 int pxa2xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
 326         struct snd_pcm *pcm)
 327 {
 328         int ret = 0;
 329
 330         if (!card->dev->dma_mask)
 331                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
 332         if (!card->dev->coherent_dma_mask)
 333                 card->dev->coherent_dma_mask = DMA_32BIT_MASK;
 334
 335         if (dai->playback.channels_min) {
 336                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 337                         SNDRV_PCM_STREAM_PLAYBACK);
 338                 if (ret)
 339                         goto out;
 340         }
 341
 342         if (dai->capture.channels_min) {
 343                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 344                         SNDRV_PCM_STREAM_CAPTURE);
 345                 if (ret)
 346                         goto out;
 347         }
 348  out:
 349         return ret;
 350 }
 351
 352 struct snd_soc_platform pxa2xx_soc_platform = {
 353         .name           = "pxa2xx-audio",
 354         .pcm_ops        = &pxa2xx_pcm_ops,
 355         .pcm_new        = pxa2xx_pcm_new,
 356         .pcm_free       = pxa2xx_pcm_free_dma_buffers,
 357 };
 358
 359 EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
 360
 361 MODULE_AUTHOR("Nicolas Pitre");
 362 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 363 MODULE_LICENSE("GPL");