linux/sound/soc/pxa/mmp-pcm.c
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   1/*
   2 * linux/sound/soc/pxa/mmp-pcm.c
   3 *
   4 * Copyright (C) 2011 Marvell International Ltd.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 */
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/platform_device.h>
  15#include <linux/slab.h>
  16#include <linux/dma-mapping.h>
  17#include <linux/dmaengine.h>
  18#include <linux/platform_data/dma-mmp_tdma.h>
  19#include <linux/platform_data/mmp_audio.h>
  20
  21#include <sound/pxa2xx-lib.h>
  22#include <sound/core.h>
  23#include <sound/pcm.h>
  24#include <sound/pcm_params.h>
  25#include <sound/soc.h>
  26#include <sound/dmaengine_pcm.h>
  27
  28struct mmp_dma_data {
  29        int ssp_id;
  30        struct resource *dma_res;
  31};
  32
  33#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |     \
  34                SNDRV_PCM_INFO_MMAP_VALID |     \
  35                SNDRV_PCM_INFO_INTERLEAVED |    \
  36                SNDRV_PCM_INFO_PAUSE |          \
  37                SNDRV_PCM_INFO_RESUME |         \
  38                SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
  39
  40static struct snd_pcm_hardware mmp_pcm_hardware[] = {
  41        {
  42                .info                   = MMP_PCM_INFO,
  43                .period_bytes_min       = 1024,
  44                .period_bytes_max       = 2048,
  45                .periods_min            = 2,
  46                .periods_max            = 32,
  47                .buffer_bytes_max       = 4096,
  48                .fifo_size              = 32,
  49        },
  50        {
  51                .info                   = MMP_PCM_INFO,
  52                .period_bytes_min       = 1024,
  53                .period_bytes_max       = 2048,
  54                .periods_min            = 2,
  55                .periods_max            = 32,
  56                .buffer_bytes_max       = 4096,
  57                .fifo_size              = 32,
  58        },
  59};
  60
  61static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
  62                              struct snd_pcm_hw_params *params)
  63{
  64        struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  65        struct dma_slave_config slave_config;
  66        int ret;
  67
  68        ret =
  69            snd_dmaengine_pcm_prepare_slave_config(substream, params,
  70                                                   &slave_config);
  71        if (ret)
  72                return ret;
  73
  74        ret = dmaengine_slave_config(chan, &slave_config);
  75        if (ret)
  76                return ret;
  77
  78        snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  79
  80        return 0;
  81}
  82
  83static bool filter(struct dma_chan *chan, void *param)
  84{
  85        struct mmp_dma_data *dma_data = param;
  86        bool found = false;
  87        char *devname;
  88
  89        devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
  90                dma_data->ssp_id);
  91        if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
  92                (chan->chan_id == dma_data->dma_res->start)) {
  93                found = true;
  94        }
  95
  96        kfree(devname);
  97        return found;
  98}
  99
 100static int mmp_pcm_open(struct snd_pcm_substream *substream)
 101{
 102        struct snd_soc_pcm_runtime *rtd = substream->private_data;
 103        struct platform_device *pdev = to_platform_device(rtd->platform->dev);
 104        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 105        struct mmp_dma_data dma_data;
 106        struct resource *r;
 107
 108        r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
 109        if (!r)
 110                return -EBUSY;
 111
 112        snd_soc_set_runtime_hwparams(substream,
 113                                &mmp_pcm_hardware[substream->stream]);
 114
 115        dma_data.dma_res = r;
 116        dma_data.ssp_id = cpu_dai->id;
 117
 118        return snd_dmaengine_pcm_open_request_chan(substream, filter,
 119                    &dma_data);
 120}
 121
 122static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
 123                         struct vm_area_struct *vma)
 124{
 125        struct snd_pcm_runtime *runtime = substream->runtime;
 126        unsigned long off = vma->vm_pgoff;
 127
 128        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 129        return remap_pfn_range(vma, vma->vm_start,
 130                __phys_to_pfn(runtime->dma_addr) + off,
 131                vma->vm_end - vma->vm_start, vma->vm_page_prot);
 132}
 133
 134static struct snd_pcm_ops mmp_pcm_ops = {
 135        .open           = mmp_pcm_open,
 136        .close          = snd_dmaengine_pcm_close_release_chan,
 137        .ioctl          = snd_pcm_lib_ioctl,
 138        .hw_params      = mmp_pcm_hw_params,
 139        .trigger        = snd_dmaengine_pcm_trigger,
 140        .pointer        = snd_dmaengine_pcm_pointer,
 141        .mmap           = mmp_pcm_mmap,
 142};
 143
 144static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
 145{
 146        struct snd_pcm_substream *substream;
 147        struct snd_dma_buffer *buf;
 148        int stream;
 149        struct gen_pool *gpool;
 150
 151        gpool = sram_get_gpool("asram");
 152        if (!gpool)
 153                return;
 154
 155        for (stream = 0; stream < 2; stream++) {
 156                size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 157
 158                substream = pcm->streams[stream].substream;
 159                if (!substream)
 160                        continue;
 161
 162                buf = &substream->dma_buffer;
 163                if (!buf->area)
 164                        continue;
 165                gen_pool_free(gpool, (unsigned long)buf->area, size);
 166                buf->area = NULL;
 167        }
 168
 169        return;
 170}
 171
 172static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
 173                                                                int stream)
 174{
 175        struct snd_dma_buffer *buf = &substream->dma_buffer;
 176        size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 177        struct gen_pool *gpool;
 178
 179        buf->dev.type = SNDRV_DMA_TYPE_DEV;
 180        buf->dev.dev = substream->pcm->card->dev;
 181        buf->private_data = NULL;
 182
 183        gpool = sram_get_gpool("asram");
 184        if (!gpool)
 185                return -ENOMEM;
 186
 187        buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
 188        if (!buf->area)
 189                return -ENOMEM;
 190        buf->bytes = size;
 191        return 0;
 192}
 193
 194static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
 195{
 196        struct snd_pcm_substream *substream;
 197        struct snd_pcm *pcm = rtd->pcm;
 198        int ret = 0, stream;
 199
 200        for (stream = 0; stream < 2; stream++) {
 201                substream = pcm->streams[stream].substream;
 202
 203                ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
 204                if (ret)
 205                        goto err;
 206        }
 207
 208        return 0;
 209
 210err:
 211        mmp_pcm_free_dma_buffers(pcm);
 212        return ret;
 213}
 214
 215static struct snd_soc_platform_driver mmp_soc_platform = {
 216        .ops            = &mmp_pcm_ops,
 217        .pcm_new        = mmp_pcm_new,
 218        .pcm_free       = mmp_pcm_free_dma_buffers,
 219};
 220
 221static int mmp_pcm_probe(struct platform_device *pdev)
 222{
 223        struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
 224
 225        if (pdata) {
 226                mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
 227                                                pdata->buffer_max_playback;
 228                mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
 229                                                pdata->period_max_playback;
 230                mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
 231                                                pdata->buffer_max_capture;
 232                mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
 233                                                pdata->period_max_capture;
 234        }
 235        return devm_snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
 236}
 237
 238static struct platform_driver mmp_pcm_driver = {
 239        .driver = {
 240                .name = "mmp-pcm-audio",
 241        },
 242
 243        .probe = mmp_pcm_probe,
 244};
 245
 246module_platform_driver(mmp_pcm_driver);
 247
 248MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 249MODULE_DESCRIPTION("MMP Soc Audio DMA module");
 250MODULE_LICENSE("GPL");
 251MODULE_ALIAS("platform:mmp-pcm-audio");
 252