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   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->dai->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         /* 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
  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
 235         ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 236         if (ret < 0)
 237                 goto out;
 238
 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");