sound/arm/pxa2xx-pcm-lib.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License version 2 as
   4  * published by the Free Software Foundation.
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/module.h>
   9 #include <linux/dma-mapping.h>
  10
  11 #include <sound/core.h>
  12 #include <sound/pcm.h>
  13 #include <sound/pcm_params.h>
  14 #include <sound/pxa2xx-lib.h>
  15
  16 #include <mach/dma.h>
  17
  18 #include "pxa2xx-pcm.h"
  19
  20 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
  21         .info                   = SNDRV_PCM_INFO_MMAP |
  22                                   SNDRV_PCM_INFO_MMAP_VALID |
  23                                   SNDRV_PCM_INFO_INTERLEAVED |
  24                                   SNDRV_PCM_INFO_PAUSE |
  25                                   SNDRV_PCM_INFO_RESUME,
  26         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  27                                         SNDRV_PCM_FMTBIT_S24_LE |
  28                                         SNDRV_PCM_FMTBIT_S32_LE,
  29         .period_bytes_min       = 32,
  30         .period_bytes_max       = 8192 - 32,
  31         .periods_min            = 1,
  32         .periods_max            = PAGE_SIZE/sizeof(pxa_dma_desc),
  33         .buffer_bytes_max       = 128 * 1024,
  34         .fifo_size              = 32,
  35 };
  36
  37 int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  38                                 struct snd_pcm_hw_params *params)
  39 {
  40         struct snd_pcm_runtime *runtime = substream->runtime;
  41         struct pxa2xx_runtime_data *rtd = runtime->private_data;
  42         size_t totsize = params_buffer_bytes(params);
  43         size_t period = params_period_bytes(params);
  44         pxa_dma_desc *dma_desc;
  45         dma_addr_t dma_buff_phys, next_desc_phys;
  46
  47         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  48         runtime->dma_bytes = totsize;
  49
  50         dma_desc = rtd->dma_desc_array;
  51         next_desc_phys = rtd->dma_desc_array_phys;
  52         dma_buff_phys = runtime->dma_addr;
  53         do {
  54                 next_desc_phys += sizeof(pxa_dma_desc);
  55                 dma_desc->ddadr = next_desc_phys;
  56                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  57                         dma_desc->dsadr = dma_buff_phys;
  58                         dma_desc->dtadr = rtd->params->dev_addr;
  59                 } else {
  60                         dma_desc->dsadr = rtd->params->dev_addr;
  61                         dma_desc->dtadr = dma_buff_phys;
  62                 }
  63                 if (period > totsize)
  64                         period = totsize;
  65                 dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
  66                 dma_desc++;
  67                 dma_buff_phys += period;
  68         } while (totsize -= period);
  69         dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
  70
  71         return 0;
  72 }
  73 EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
  74
  75 int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  76 {
  77         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
  78
  79         if (rtd && rtd->params && rtd->params->drcmr)
  80                 *rtd->params->drcmr = 0;
  81
  82         snd_pcm_set_runtime_buffer(substream, NULL);
  83         return 0;
  84 }
  85 EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
  86
  87 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
  88 {
  89         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
  90         int ret = 0;
  91
  92         switch (cmd) {
  93         case SNDRV_PCM_TRIGGER_START:
  94                 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
  95                 DCSR(prtd->dma_ch) = DCSR_RUN;
  96                 break;
  97
  98         case SNDRV_PCM_TRIGGER_STOP:
  99         case SNDRV_PCM_TRIGGER_SUSPEND:
 100         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 101                 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
 102                 break;
 103
 104         case SNDRV_PCM_TRIGGER_RESUME:
 105                 DCSR(prtd->dma_ch) |= DCSR_RUN;
 106                 break;
 107         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 108                 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
 109                 DCSR(prtd->dma_ch) |= DCSR_RUN;
 110                 break;
 111
 112         default:
 113                 ret = -EINVAL;
 114         }
 115
 116         return ret;
 117 }
 118 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
 119
 120 snd_pcm_uframes_t
 121 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
 122 {
 123         struct snd_pcm_runtime *runtime = substream->runtime;
 124         struct pxa2xx_runtime_data *prtd = runtime->private_data;
 125
 126         dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 127                          DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
 128         snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 129
 130         if (x == runtime->buffer_size)
 131                 x = 0;
 132         return x;
 133 }
 134 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
 135
 136 int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
 137 {
 138         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
 139
 140         if (!prtd || !prtd->params)
 141                 return 0;
 142
 143         if (prtd->dma_ch == -1)
 144                 return -EINVAL;
 145
 146         DCSR(prtd->dma_ch) &= ~DCSR_RUN;
 147         DCSR(prtd->dma_ch) = 0;
 148         DCMD(prtd->dma_ch) = 0;
 149         *prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
 150
 151         return 0;
 152 }
 153 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
 154
 155 void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
 156 {
 157         struct snd_pcm_substream *substream = dev_id;
 158         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
 159         int dcsr;
 160
 161         dcsr = DCSR(dma_ch);
 162         DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
 163
 164         if (dcsr & DCSR_ENDINTR) {
 165                 snd_pcm_period_elapsed(substream);
 166         } else {
 167                 printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
 168                         rtd->params->name, dma_ch, dcsr);
 169                 snd_pcm_stream_lock(substream);
 170                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 171                 snd_pcm_stream_unlock(substream);
 172         }
 173 }
 174 EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
 175
 176 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
 177 {
 178         struct snd_pcm_runtime *runtime = substream->runtime;
 179         struct pxa2xx_runtime_data *rtd;
 180         int ret;
 181
 182         runtime->hw = pxa2xx_pcm_hardware;
 183
 184         /*
 185          * For mysterious reasons (and despite what the manual says)
 186          * playback samples are lost if the DMA count is not a multiple
 187          * of the DMA burst size.  Let's add a rule to enforce that.
 188          */
 189         ret = snd_pcm_hw_constraint_step(runtime, 0,
 190                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
 191         if (ret)
 192                 goto out;
 193
 194         ret = snd_pcm_hw_constraint_step(runtime, 0,
 195                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
 196         if (ret)
 197                 goto out;
 198
 199         ret = snd_pcm_hw_constraint_integer(runtime,
 200                                             SNDRV_PCM_HW_PARAM_PERIODS);
 201         if (ret < 0)
 202                 goto out;
 203
 204         ret = -ENOMEM;
 205         rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
 206         if (!rtd)
 207                 goto out;
 208         rtd->dma_desc_array =
 209                 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 210                                        &rtd->dma_desc_array_phys, GFP_KERNEL);
 211         if (!rtd->dma_desc_array)
 212                 goto err1;
 213
 214         rtd->dma_ch = -1;
 215         runtime->private_data = rtd;
 216         return 0;
 217
 218  err1:
 219         kfree(rtd);
 220  out:
 221         return ret;
 222 }
 223 EXPORT_SYMBOL(__pxa2xx_pcm_open);
 224
 225 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
 226 {
 227         struct snd_pcm_runtime *runtime = substream->runtime;
 228         struct pxa2xx_runtime_data *rtd = runtime->private_data;
 229
 230         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 231                               rtd->dma_desc_array, rtd->dma_desc_array_phys);
 232         kfree(rtd);
 233         return 0;
 234 }
 235 EXPORT_SYMBOL(__pxa2xx_pcm_close);
 236
 237 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
 238         struct vm_area_struct *vma)
 239 {
 240         struct snd_pcm_runtime *runtime = substream->runtime;
 241         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 242                                      runtime->dma_area,
 243                                      runtime->dma_addr,
 244                                      runtime->dma_bytes);
 245 }
 246 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
 247
 248 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 249 {
 250         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 251         struct snd_dma_buffer *buf = &substream->dma_buffer;
 252         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
 253         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 254         buf->dev.dev = pcm->card->dev;
 255         buf->private_data = NULL;
 256         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 257                                            &buf->addr, GFP_KERNEL);
 258         if (!buf->area)
 259                 return -ENOMEM;
 260         buf->bytes = size;
 261         return 0;
 262 }
 263 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
 264
 265 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 266 {
 267         struct snd_pcm_substream *substream;
 268         struct snd_dma_buffer *buf;
 269         int stream;
 270
 271         for (stream = 0; stream < 2; stream++) {
 272                 substream = pcm->streams[stream].substream;
 273                 if (!substream)
 274                         continue;
 275                 buf = &substream->dma_buffer;
 276                 if (!buf->area)
 277                         continue;
 278                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 279                                       buf->area, buf->addr);
 280                 buf->area = NULL;
 281         }
 282 }
 283 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
 284
 285 MODULE_AUTHOR("Nicolas Pitre");
 286 MODULE_DESCRIPTION("Intel PXA2xx sound library");
 287 MODULE_LICENSE("GPL");