linux/sound/arm/pxa2xx-pcm-lib.c
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   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
  19static 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
  36int __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}
  72EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
  73
  74int __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}
  84EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
  85
  86int 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}
 117EXPORT_SYMBOL(pxa2xx_pcm_trigger);
 118
 119snd_pcm_uframes_t
 120pxa2xx_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}
 133EXPORT_SYMBOL(pxa2xx_pcm_pointer);
 134
 135int __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}
 146EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
 147
 148void 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}
 165EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
 166
 167int __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}
 213EXPORT_SYMBOL(__pxa2xx_pcm_open);
 214
 215int __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}
 225EXPORT_SYMBOL(__pxa2xx_pcm_close);
 226
 227int 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}
 236EXPORT_SYMBOL(pxa2xx_pcm_mmap);
 237
 238int 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}
 253EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
 254
 255void 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}
 273EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
 274
 275MODULE_AUTHOR("Nicolas Pitre");
 276MODULE_DESCRIPTION("Intel PXA2xx sound library");
 277MODULE_LICENSE("GPL");
 278