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 #include <linux/dmaengine.h>
  11
  12 #include <sound/core.h>
  13 #include <sound/pcm.h>
  14 #include <sound/pcm_params.h>
  15 #include <sound/pxa2xx-lib.h>
  16 #include <sound/dmaengine_pcm.h>
  17
  18 #include <mach/dma.h>
  19
  20 #include "pxa2xx-pcm.h"
  21
  22 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
  23         .info                   = SNDRV_PCM_INFO_MMAP |
  24                                   SNDRV_PCM_INFO_MMAP_VALID |
  25                                   SNDRV_PCM_INFO_INTERLEAVED |
  26                                   SNDRV_PCM_INFO_PAUSE |
  27                                   SNDRV_PCM_INFO_RESUME,
  28         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  29                                         SNDRV_PCM_FMTBIT_S24_LE |
  30                                         SNDRV_PCM_FMTBIT_S32_LE,
  31         .period_bytes_min       = 32,
  32         .period_bytes_max       = 8192 - 32,
  33         .periods_min            = 1,
  34         .periods_max            = PAGE_SIZE/sizeof(pxa_dma_desc),
  35         .buffer_bytes_max       = 128 * 1024,
  36         .fifo_size              = 32,
  37 };
  38
  39 int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  40                                 struct snd_pcm_hw_params *params)
  41 {
  42         struct snd_pcm_runtime *runtime = substream->runtime;
  43         struct pxa2xx_runtime_data *rtd = runtime->private_data;
  44         size_t totsize = params_buffer_bytes(params);
  45         size_t period = params_period_bytes(params);
  46         pxa_dma_desc *dma_desc;
  47         dma_addr_t dma_buff_phys, next_desc_phys;
  48         u32 dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
  49
  50         /* temporary transition hack */
  51         switch (rtd->params->addr_width) {
  52         case DMA_SLAVE_BUSWIDTH_1_BYTE:
  53                 dcmd |= DCMD_WIDTH1;
  54                 break;
  55         case DMA_SLAVE_BUSWIDTH_2_BYTES:
  56                 dcmd |= DCMD_WIDTH2;
  57                 break;
  58         case DMA_SLAVE_BUSWIDTH_4_BYTES:
  59                 dcmd |= DCMD_WIDTH4;
  60                 break;
  61         default:
  62                 /* can't happen */
  63                 break;
  64         }
  65
  66         switch (rtd->params->maxburst) {
  67         case 8:
  68                 dcmd |= DCMD_BURST8;
  69                 break;
  70         case 16:
  71                 dcmd |= DCMD_BURST16;
  72                 break;
  73         case 32:
  74                 dcmd |= DCMD_BURST32;
  75                 break;
  76         }
  77
  78         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  79         runtime->dma_bytes = totsize;
  80
  81         dma_desc = rtd->dma_desc_array;
  82         next_desc_phys = rtd->dma_desc_array_phys;
  83         dma_buff_phys = runtime->dma_addr;
  84         do {
  85                 next_desc_phys += sizeof(pxa_dma_desc);
  86                 dma_desc->ddadr = next_desc_phys;
  87                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  88                         dma_desc->dsadr = dma_buff_phys;
  89                         dma_desc->dtadr = rtd->params->addr;
  90                 } else {
  91                         dma_desc->dsadr = rtd->params->addr;
  92                         dma_desc->dtadr = dma_buff_phys;
  93                 }
  94                 if (period > totsize)
  95                         period = totsize;
  96                 dma_desc->dcmd = dcmd | period | DCMD_ENDIRQEN;
  97                 dma_desc++;
  98                 dma_buff_phys += period;
  99         } while (totsize -= period);
 100         dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
 101
 102         return 0;
 103 }
 104 EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
 105
 106 int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
 107 {
 108         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
 109
 110         if (rtd && rtd->params && rtd->params->filter_data) {
 111                 unsigned long req = *(unsigned long *) rtd->params->filter_data;
 112                 DRCMR(req) = 0;
 113         }
 114
 115         snd_pcm_set_runtime_buffer(substream, NULL);
 116         return 0;
 117 }
 118 EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
 119
 120 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 121 {
 122         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
 123         int ret = 0;
 124
 125         switch (cmd) {
 126         case SNDRV_PCM_TRIGGER_START:
 127                 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
 128                 DCSR(prtd->dma_ch) = DCSR_RUN;
 129                 break;
 130
 131         case SNDRV_PCM_TRIGGER_STOP:
 132         case SNDRV_PCM_TRIGGER_SUSPEND:
 133         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 134                 DCSR(prtd->dma_ch) &= ~DCSR_RUN;
 135                 break;
 136
 137         case SNDRV_PCM_TRIGGER_RESUME:
 138                 DCSR(prtd->dma_ch) |= DCSR_RUN;
 139                 break;
 140         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 141                 DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
 142                 DCSR(prtd->dma_ch) |= DCSR_RUN;
 143                 break;
 144
 145         default:
 146                 ret = -EINVAL;
 147         }
 148
 149         return ret;
 150 }
 151 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
 152
 153 snd_pcm_uframes_t
 154 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
 155 {
 156         struct snd_pcm_runtime *runtime = substream->runtime;
 157         struct pxa2xx_runtime_data *prtd = runtime->private_data;
 158
 159         dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 160                          DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
 161         snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 162
 163         if (x == runtime->buffer_size)
 164                 x = 0;
 165         return x;
 166 }
 167 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
 168
 169 int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
 170 {
 171         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
 172         unsigned long req;
 173
 174         if (!prtd || !prtd->params)
 175                 return 0;
 176
 177         if (prtd->dma_ch == -1)
 178                 return -EINVAL;
 179
 180         DCSR(prtd->dma_ch) &= ~DCSR_RUN;
 181         DCSR(prtd->dma_ch) = 0;
 182         DCMD(prtd->dma_ch) = 0;
 183         req = *(unsigned long *) prtd->params->filter_data;
 184         DRCMR(req) = prtd->dma_ch | DRCMR_MAPVLD;
 185
 186         return 0;
 187 }
 188 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
 189
 190 void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
 191 {
 192         struct snd_pcm_substream *substream = dev_id;
 193         int dcsr;
 194
 195         dcsr = DCSR(dma_ch);
 196         DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
 197
 198         if (dcsr & DCSR_ENDINTR) {
 199                 snd_pcm_period_elapsed(substream);
 200         } else {
 201                 printk(KERN_ERR "DMA error on channel %d (DCSR=%#x)\n",
 202                         dma_ch, dcsr);
 203                 snd_pcm_stop_xrun(substream);
 204         }
 205 }
 206 EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
 207
 208 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
 209 {
 210         struct snd_pcm_runtime *runtime = substream->runtime;
 211         struct pxa2xx_runtime_data *rtd;
 212         int ret;
 213
 214         runtime->hw = pxa2xx_pcm_hardware;
 215
 216         /*
 217          * For mysterious reasons (and despite what the manual says)
 218          * playback samples are lost if the DMA count is not a multiple
 219          * of the DMA burst size.  Let's add a rule to enforce that.
 220          */
 221         ret = snd_pcm_hw_constraint_step(runtime, 0,
 222                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
 223         if (ret)
 224                 goto out;
 225
 226         ret = snd_pcm_hw_constraint_step(runtime, 0,
 227                 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
 228         if (ret)
 229                 goto out;
 230
 231         ret = snd_pcm_hw_constraint_integer(runtime,
 232                                             SNDRV_PCM_HW_PARAM_PERIODS);
 233         if (ret < 0)
 234                 goto out;
 235
 236         ret = -ENOMEM;
 237         rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
 238         if (!rtd)
 239                 goto out;
 240         rtd->dma_desc_array =
 241                 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 242                                        &rtd->dma_desc_array_phys, GFP_KERNEL);
 243         if (!rtd->dma_desc_array)
 244                 goto err1;
 245
 246         rtd->dma_ch = -1;
 247         runtime->private_data = rtd;
 248         return 0;
 249
 250  err1:
 251         kfree(rtd);
 252  out:
 253         return ret;
 254 }
 255 EXPORT_SYMBOL(__pxa2xx_pcm_open);
 256
 257 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
 258 {
 259         struct snd_pcm_runtime *runtime = substream->runtime;
 260         struct pxa2xx_runtime_data *rtd = runtime->private_data;
 261
 262         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 263                               rtd->dma_desc_array, rtd->dma_desc_array_phys);
 264         kfree(rtd);
 265         return 0;
 266 }
 267 EXPORT_SYMBOL(__pxa2xx_pcm_close);
 268
 269 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
 270         struct vm_area_struct *vma)
 271 {
 272         struct snd_pcm_runtime *runtime = substream->runtime;
 273         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 274                                      runtime->dma_area,
 275                                      runtime->dma_addr,
 276                                      runtime->dma_bytes);
 277 }
 278 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
 279
 280 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 281 {
 282         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 283         struct snd_dma_buffer *buf = &substream->dma_buffer;
 284         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
 285         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 286         buf->dev.dev = pcm->card->dev;
 287         buf->private_data = NULL;
 288         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 289                                            &buf->addr, GFP_KERNEL);
 290         if (!buf->area)
 291                 return -ENOMEM;
 292         buf->bytes = size;
 293         return 0;
 294 }
 295 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
 296
 297 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 298 {
 299         struct snd_pcm_substream *substream;
 300         struct snd_dma_buffer *buf;
 301         int stream;
 302
 303         for (stream = 0; stream < 2; stream++) {
 304                 substream = pcm->streams[stream].substream;
 305                 if (!substream)
 306                         continue;
 307                 buf = &substream->dma_buffer;
 308                 if (!buf->area)
 309                         continue;
 310                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 311                                       buf->area, buf->addr);
 312                 buf->area = NULL;
 313         }
 314 }
 315 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
 316
 317 MODULE_AUTHOR("Nicolas Pitre");
 318 MODULE_DESCRIPTION("Intel PXA2xx sound library");
 319 MODULE_LICENSE("GPL");