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/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
  20static 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
  37int __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}
  73EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
  74
  75int __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}
  85EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
  86
  87int 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}
 118EXPORT_SYMBOL(pxa2xx_pcm_trigger);
 119
 120snd_pcm_uframes_t
 121pxa2xx_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}
 134EXPORT_SYMBOL(pxa2xx_pcm_pointer);
 135
 136int __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}
 153EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
 154
 155void 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_stop(substream, SNDRV_PCM_STATE_XRUN);
 170        }
 171}
 172EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
 173
 174int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
 175{
 176        struct snd_pcm_runtime *runtime = substream->runtime;
 177        struct pxa2xx_runtime_data *rtd;
 178        int ret;
 179
 180        runtime->hw = pxa2xx_pcm_hardware;
 181
 182        /*
 183         * For mysterious reasons (and despite what the manual says)
 184         * playback samples are lost if the DMA count is not a multiple
 185         * of the DMA burst size.  Let's add a rule to enforce that.
 186         */
 187        ret = snd_pcm_hw_constraint_step(runtime, 0,
 188                SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
 189        if (ret)
 190                goto out;
 191
 192        ret = snd_pcm_hw_constraint_step(runtime, 0,
 193                SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
 194        if (ret)
 195                goto out;
 196
 197        ret = snd_pcm_hw_constraint_integer(runtime,
 198                                            SNDRV_PCM_HW_PARAM_PERIODS);
 199        if (ret < 0)
 200                goto out;
 201
 202        ret = -ENOMEM;
 203        rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
 204        if (!rtd)
 205                goto out;
 206        rtd->dma_desc_array =
 207                dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 208                                       &rtd->dma_desc_array_phys, GFP_KERNEL);
 209        if (!rtd->dma_desc_array)
 210                goto err1;
 211
 212        rtd->dma_ch = -1;
 213        runtime->private_data = rtd;
 214        return 0;
 215
 216 err1:
 217        kfree(rtd);
 218 out:
 219        return ret;
 220}
 221EXPORT_SYMBOL(__pxa2xx_pcm_open);
 222
 223int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
 224{
 225        struct snd_pcm_runtime *runtime = substream->runtime;
 226        struct pxa2xx_runtime_data *rtd = runtime->private_data;
 227
 228        dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 229                              rtd->dma_desc_array, rtd->dma_desc_array_phys);
 230        kfree(rtd);
 231        return 0;
 232}
 233EXPORT_SYMBOL(__pxa2xx_pcm_close);
 234
 235int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
 236        struct vm_area_struct *vma)
 237{
 238        struct snd_pcm_runtime *runtime = substream->runtime;
 239        return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 240                                     runtime->dma_area,
 241                                     runtime->dma_addr,
 242                                     runtime->dma_bytes);
 243}
 244EXPORT_SYMBOL(pxa2xx_pcm_mmap);
 245
 246int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 247{
 248        struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 249        struct snd_dma_buffer *buf = &substream->dma_buffer;
 250        size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
 251        buf->dev.type = SNDRV_DMA_TYPE_DEV;
 252        buf->dev.dev = pcm->card->dev;
 253        buf->private_data = NULL;
 254        buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 255                                           &buf->addr, GFP_KERNEL);
 256        if (!buf->area)
 257                return -ENOMEM;
 258        buf->bytes = size;
 259        return 0;
 260}
 261EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
 262
 263void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 264{
 265        struct snd_pcm_substream *substream;
 266        struct snd_dma_buffer *buf;
 267        int stream;
 268
 269        for (stream = 0; stream < 2; stream++) {
 270                substream = pcm->streams[stream].substream;
 271                if (!substream)
 272                        continue;
 273                buf = &substream->dma_buffer;
 274                if (!buf->area)
 275                        continue;
 276                dma_free_writecombine(pcm->card->dev, buf->bytes,
 277                                      buf->area, buf->addr);
 278                buf->area = NULL;
 279        }
 280}
 281EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
 282
 283MODULE_AUTHOR("Nicolas Pitre");
 284MODULE_DESCRIPTION("Intel PXA2xx sound library");
 285MODULE_LICENSE("GPL");
 286
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