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