linux/sound/soc/pxa/mmp-pcm.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * linux/sound/soc/pxa/mmp-pcm.c
   4 *
   5 * Copyright (C) 2011 Marvell International Ltd.
   6 */
   7#include <linux/module.h>
   8#include <linux/init.h>
   9#include <linux/platform_device.h>
  10#include <linux/slab.h>
  11#include <linux/dma-mapping.h>
  12#include <linux/dmaengine.h>
  13#include <linux/platform_data/dma-mmp_tdma.h>
  14#include <linux/platform_data/mmp_audio.h>
  15
  16#include <sound/pxa2xx-lib.h>
  17#include <sound/core.h>
  18#include <sound/pcm.h>
  19#include <sound/pcm_params.h>
  20#include <sound/soc.h>
  21#include <sound/dmaengine_pcm.h>
  22
  23#define DRV_NAME "mmp-pcm"
  24
  25struct mmp_dma_data {
  26        int ssp_id;
  27        struct resource *dma_res;
  28};
  29
  30#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |     \
  31                SNDRV_PCM_INFO_MMAP_VALID |     \
  32                SNDRV_PCM_INFO_INTERLEAVED |    \
  33                SNDRV_PCM_INFO_PAUSE |          \
  34                SNDRV_PCM_INFO_RESUME |         \
  35                SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
  36
  37static struct snd_pcm_hardware mmp_pcm_hardware[] = {
  38        {
  39                .info                   = MMP_PCM_INFO,
  40                .period_bytes_min       = 1024,
  41                .period_bytes_max       = 2048,
  42                .periods_min            = 2,
  43                .periods_max            = 32,
  44                .buffer_bytes_max       = 4096,
  45                .fifo_size              = 32,
  46        },
  47        {
  48                .info                   = MMP_PCM_INFO,
  49                .period_bytes_min       = 1024,
  50                .period_bytes_max       = 2048,
  51                .periods_min            = 2,
  52                .periods_max            = 32,
  53                .buffer_bytes_max       = 4096,
  54                .fifo_size              = 32,
  55        },
  56};
  57
  58static int mmp_pcm_hw_params(struct snd_soc_component *component,
  59                             struct snd_pcm_substream *substream,
  60                             struct snd_pcm_hw_params *params)
  61{
  62        struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
  63        struct dma_slave_config slave_config;
  64        int ret;
  65
  66        ret =
  67            snd_dmaengine_pcm_prepare_slave_config(substream, params,
  68                                                   &slave_config);
  69        if (ret)
  70                return ret;
  71
  72        ret = dmaengine_slave_config(chan, &slave_config);
  73        if (ret)
  74                return ret;
  75
  76        snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  77
  78        return 0;
  79}
  80
  81static int mmp_pcm_trigger(struct snd_soc_component *component,
  82                           struct snd_pcm_substream *substream, int cmd)
  83{
  84        return snd_dmaengine_pcm_trigger(substream, cmd);
  85}
  86
  87static snd_pcm_uframes_t mmp_pcm_pointer(struct snd_soc_component *component,
  88                                         struct snd_pcm_substream *substream)
  89{
  90        return snd_dmaengine_pcm_pointer(substream);
  91}
  92
  93static bool filter(struct dma_chan *chan, void *param)
  94{
  95        struct mmp_dma_data *dma_data = param;
  96        bool found = false;
  97        char *devname;
  98
  99        devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
 100                dma_data->ssp_id);
 101        if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
 102                (chan->chan_id == dma_data->dma_res->start)) {
 103                found = true;
 104        }
 105
 106        kfree(devname);
 107        return found;
 108}
 109
 110static int mmp_pcm_open(struct snd_soc_component *component,
 111                        struct snd_pcm_substream *substream)
 112{
 113        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 114        struct platform_device *pdev = to_platform_device(component->dev);
 115        struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
 116        struct mmp_dma_data dma_data;
 117        struct resource *r;
 118
 119        r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
 120        if (!r)
 121                return -EBUSY;
 122
 123        snd_soc_set_runtime_hwparams(substream,
 124                                &mmp_pcm_hardware[substream->stream]);
 125
 126        dma_data.dma_res = r;
 127        dma_data.ssp_id = cpu_dai->id;
 128
 129        return snd_dmaengine_pcm_open_request_chan(substream, filter,
 130                    &dma_data);
 131}
 132
 133static int mmp_pcm_close(struct snd_soc_component *component,
 134                         struct snd_pcm_substream *substream)
 135{
 136        return snd_dmaengine_pcm_close_release_chan(substream);
 137}
 138
 139static int mmp_pcm_mmap(struct snd_soc_component *component,
 140                        struct snd_pcm_substream *substream,
 141                        struct vm_area_struct *vma)
 142{
 143        struct snd_pcm_runtime *runtime = substream->runtime;
 144        unsigned long off = vma->vm_pgoff;
 145
 146        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 147        return remap_pfn_range(vma, vma->vm_start,
 148                __phys_to_pfn(runtime->dma_addr) + off,
 149                vma->vm_end - vma->vm_start, vma->vm_page_prot);
 150}
 151
 152static void mmp_pcm_free_dma_buffers(struct snd_soc_component *component,
 153                                     struct snd_pcm *pcm)
 154{
 155        struct snd_pcm_substream *substream;
 156        struct snd_dma_buffer *buf;
 157        int stream;
 158        struct gen_pool *gpool;
 159
 160        gpool = sram_get_gpool("asram");
 161        if (!gpool)
 162                return;
 163
 164        for (stream = 0; stream < 2; stream++) {
 165                size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 166
 167                substream = pcm->streams[stream].substream;
 168                if (!substream)
 169                        continue;
 170
 171                buf = &substream->dma_buffer;
 172                if (!buf->area)
 173                        continue;
 174                gen_pool_free(gpool, (unsigned long)buf->area, size);
 175                buf->area = NULL;
 176        }
 177
 178}
 179
 180static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
 181                                                                int stream)
 182{
 183        struct snd_dma_buffer *buf = &substream->dma_buffer;
 184        size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
 185        struct gen_pool *gpool;
 186
 187        buf->dev.type = SNDRV_DMA_TYPE_DEV;
 188        buf->dev.dev = substream->pcm->card->dev;
 189        buf->private_data = NULL;
 190
 191        gpool = sram_get_gpool("asram");
 192        if (!gpool)
 193                return -ENOMEM;
 194
 195        buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
 196        if (!buf->area)
 197                return -ENOMEM;
 198        buf->bytes = size;
 199        return 0;
 200}
 201
 202static int mmp_pcm_new(struct snd_soc_component *component,
 203                       struct snd_soc_pcm_runtime *rtd)
 204{
 205        struct snd_pcm_substream *substream;
 206        struct snd_pcm *pcm = rtd->pcm;
 207        int ret = 0, stream;
 208
 209        for (stream = 0; stream < 2; stream++) {
 210                substream = pcm->streams[stream].substream;
 211
 212                ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
 213                if (ret)
 214                        goto err;
 215        }
 216
 217        return 0;
 218
 219err:
 220        mmp_pcm_free_dma_buffers(component, pcm);
 221        return ret;
 222}
 223
 224static const struct snd_soc_component_driver mmp_soc_component = {
 225        .name           = DRV_NAME,
 226        .open           = mmp_pcm_open,
 227        .close          = mmp_pcm_close,
 228        .hw_params      = mmp_pcm_hw_params,
 229        .trigger        = mmp_pcm_trigger,
 230        .pointer        = mmp_pcm_pointer,
 231        .mmap           = mmp_pcm_mmap,
 232        .pcm_construct  = mmp_pcm_new,
 233        .pcm_destruct   = mmp_pcm_free_dma_buffers,
 234};
 235
 236static int mmp_pcm_probe(struct platform_device *pdev)
 237{
 238        struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
 239
 240        if (pdata) {
 241                mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
 242                                                pdata->buffer_max_playback;
 243                mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
 244                                                pdata->period_max_playback;
 245                mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
 246                                                pdata->buffer_max_capture;
 247                mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
 248                                                pdata->period_max_capture;
 249        }
 250        return devm_snd_soc_register_component(&pdev->dev, &mmp_soc_component,
 251                                               NULL, 0);
 252}
 253
 254static struct platform_driver mmp_pcm_driver = {
 255        .driver = {
 256                .name = "mmp-pcm-audio",
 257        },
 258
 259        .probe = mmp_pcm_probe,
 260};
 261
 262module_platform_driver(mmp_pcm_driver);
 263
 264MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 265MODULE_DESCRIPTION("MMP Soc Audio DMA module");
 266MODULE_LICENSE("GPL");
 267MODULE_ALIAS("platform:mmp-pcm-audio");
 268