sound/soc/ux500/ux500_pcm.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2012
   3  *
   4  * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
   5  *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
   6  *         for ST-Ericsson.
   7  *
   8  * License terms:
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as published
  12  * by the Free Software Foundation.
  13  */
  14
  15 #include <asm/page.h>
  16
  17 #include <linux/module.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/dmaengine.h>
  20 #include <linux/slab.h>
  21 #include <linux/platform_data/dma-ste-dma40.h>
  22
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26 #include <sound/dmaengine_pcm.h>
  27
  28 #include "ux500_msp_i2s.h"
  29 #include "ux500_pcm.h"
  30
  31 #define UX500_PLATFORM_MIN_RATE 8000
  32 #define UX500_PLATFORM_MAX_RATE 48000
  33
  34 #define UX500_PLATFORM_MIN_CHANNELS 1
  35 #define UX500_PLATFORM_MAX_CHANNELS 8
  36
  37 #define UX500_PLATFORM_PERIODS_BYTES_MIN        128
  38 #define UX500_PLATFORM_PERIODS_BYTES_MAX        (64 * PAGE_SIZE)
  39 #define UX500_PLATFORM_PERIODS_MIN              2
  40 #define UX500_PLATFORM_PERIODS_MAX              48
  41 #define UX500_PLATFORM_BUFFER_BYTES_MAX         (2048 * PAGE_SIZE)
  42
  43 static struct snd_pcm_hardware ux500_pcm_hw = {
  44         .info = SNDRV_PCM_INFO_INTERLEAVED |
  45                 SNDRV_PCM_INFO_MMAP |
  46                 SNDRV_PCM_INFO_RESUME |
  47                 SNDRV_PCM_INFO_PAUSE,
  48         .formats = SNDRV_PCM_FMTBIT_S16_LE |
  49                 SNDRV_PCM_FMTBIT_U16_LE |
  50                 SNDRV_PCM_FMTBIT_S16_BE |
  51                 SNDRV_PCM_FMTBIT_U16_BE,
  52         .rates = SNDRV_PCM_RATE_KNOT,
  53         .rate_min = UX500_PLATFORM_MIN_RATE,
  54         .rate_max = UX500_PLATFORM_MAX_RATE,
  55         .channels_min = UX500_PLATFORM_MIN_CHANNELS,
  56         .channels_max = UX500_PLATFORM_MAX_CHANNELS,
  57         .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
  58         .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
  59         .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
  60         .periods_min = UX500_PLATFORM_PERIODS_MIN,
  61         .periods_max = UX500_PLATFORM_PERIODS_MAX,
  62 };
  63
  64 static void ux500_pcm_dma_hw_free(struct device *dev,
  65                                 struct snd_pcm_substream *substream)
  66 {
  67         struct snd_pcm_runtime *runtime = substream->runtime;
  68         struct snd_dma_buffer *buf = runtime->dma_buffer_p;
  69
  70         if (runtime->dma_area == NULL)
  71                 return;
  72
  73         if (buf != &substream->dma_buffer) {
  74                 dma_free_coherent(buf->dev.dev, buf->bytes, buf->area,
  75                                 buf->addr);
  76                 kfree(runtime->dma_buffer_p);
  77         }
  78
  79         snd_pcm_set_runtime_buffer(substream, NULL);
  80 }
  81
  82 static int ux500_pcm_open(struct snd_pcm_substream *substream)
  83 {
  84         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  85         struct snd_soc_dai *dai = rtd->cpu_dai;
  86         struct device *dev = dai->dev;
  87         int ret;
  88         struct ux500_msp_dma_params *dma_params;
  89         u16 per_data_width, mem_data_width;
  90         struct stedma40_chan_cfg *dma_cfg;
  91
  92         dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
  93                 snd_pcm_stream_str(substream));
  94
  95         dev_dbg(dev, "%s: Set runtime hwparams.\n", __func__);
  96         snd_soc_set_runtime_hwparams(substream, &ux500_pcm_hw);
  97
  98         mem_data_width = STEDMA40_HALFWORD_WIDTH;
  99
 100         dma_params = snd_soc_dai_get_dma_data(dai, substream);
 101         switch (dma_params->data_size) {
 102         case 32:
 103                 per_data_width = STEDMA40_WORD_WIDTH;
 104                 break;
 105         case 16:
 106                 per_data_width = STEDMA40_HALFWORD_WIDTH;
 107                 break;
 108         case 8:
 109                 per_data_width = STEDMA40_BYTE_WIDTH;
 110                 break;
 111         default:
 112                 per_data_width = STEDMA40_WORD_WIDTH;
 113                 dev_warn(rtd->platform->dev,
 114                         "%s: Unknown data-size (%d)! Assuming 32 bits.\n",
 115                         __func__, dma_params->data_size);
 116         }
 117
 118         dma_cfg = dma_params->dma_cfg;
 119
 120         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 121                 dma_cfg->src_info.data_width = mem_data_width;
 122                 dma_cfg->dst_info.data_width = per_data_width;
 123         } else {
 124                 dma_cfg->src_info.data_width = per_data_width;
 125                 dma_cfg->dst_info.data_width = mem_data_width;
 126         }
 127
 128
 129         ret = snd_dmaengine_pcm_open(substream, stedma40_filter, dma_cfg);
 130         if (ret) {
 131                 dev_dbg(dai->dev,
 132                         "%s: ERROR: snd_dmaengine_pcm_open failed (%d)!\n",
 133                         __func__, ret);
 134                 return ret;
 135         }
 136
 137         return 0;
 138 }
 139
 140 static int ux500_pcm_hw_params(struct snd_pcm_substream *substream,
 141                         struct snd_pcm_hw_params *hw_params)
 142 {
 143         struct snd_pcm_runtime *runtime = substream->runtime;
 144         struct snd_dma_buffer *buf = runtime->dma_buffer_p;
 145         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 146         int ret = 0;
 147         int size;
 148
 149         dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);
 150
 151         size = params_buffer_bytes(hw_params);
 152
 153         if (buf) {
 154                 if (buf->bytes >= size)
 155                         goto out;
 156                 ux500_pcm_dma_hw_free(NULL, substream);
 157         }
 158
 159         if (substream->dma_buffer.area != NULL &&
 160                 substream->dma_buffer.bytes >= size) {
 161                 buf = &substream->dma_buffer;
 162         } else {
 163                 buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
 164                 if (!buf)
 165                         goto nomem;
 166
 167                 buf->dev.type = SNDRV_DMA_TYPE_DEV;
 168                 buf->dev.dev = NULL;
 169                 buf->area = dma_alloc_coherent(NULL, size, &buf->addr,
 170                                         GFP_KERNEL);
 171                 buf->bytes = size;
 172                 buf->private_data = NULL;
 173
 174                 if (!buf->area)
 175                         goto free;
 176         }
 177         snd_pcm_set_runtime_buffer(substream, buf);
 178         ret = 1;
 179  out:
 180         runtime->dma_bytes = size;
 181         return ret;
 182
 183  free:
 184         kfree(buf);
 185  nomem:
 186         return -ENOMEM;
 187 }
 188
 189 static int ux500_pcm_hw_free(struct snd_pcm_substream *substream)
 190 {
 191         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 192
 193         dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);
 194
 195         ux500_pcm_dma_hw_free(NULL, substream);
 196
 197         return 0;
 198 }
 199
 200 static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
 201                         struct vm_area_struct *vma)
 202 {
 203         struct snd_pcm_runtime *runtime = substream->runtime;
 204         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 205
 206         dev_dbg(rtd->platform->dev, "%s: Enter.\n", __func__);
 207
 208         return dma_mmap_coherent(NULL, vma, runtime->dma_area,
 209                                 runtime->dma_addr, runtime->dma_bytes);
 210 }
 211
 212 static struct snd_pcm_ops ux500_pcm_ops = {
 213         .open           = ux500_pcm_open,
 214         .close          = snd_dmaengine_pcm_close,
 215         .ioctl          = snd_pcm_lib_ioctl,
 216         .hw_params      = ux500_pcm_hw_params,
 217         .hw_free        = ux500_pcm_hw_free,
 218         .trigger        = snd_dmaengine_pcm_trigger,
 219         .pointer        = snd_dmaengine_pcm_pointer_no_residue,
 220         .mmap           = ux500_pcm_mmap
 221 };
 222
 223 int ux500_pcm_new(struct snd_soc_pcm_runtime *rtd)
 224 {
 225         struct snd_pcm *pcm = rtd->pcm;
 226
 227         dev_dbg(rtd->platform->dev, "%s: Enter (id = '%s').\n", __func__,
 228                 pcm->id);
 229
 230         pcm->info_flags = 0;
 231
 232         return 0;
 233 }
 234
 235 static struct snd_soc_platform_driver ux500_pcm_soc_drv = {
 236         .ops            = &ux500_pcm_ops,
 237         .pcm_new        = ux500_pcm_new,
 238 };
 239
 240 int ux500_pcm_register_platform(struct platform_device *pdev)
 241 {
 242         int ret;
 243
 244         ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
 245         if (ret < 0) {
 246                 dev_err(&pdev->dev,
 247                         "%s: ERROR: Failed to register platform '%s' (%d)!\n",
 248                         __func__, pdev->name, ret);
 249                 return ret;
 250         }
 251
 252         return 0;
 253 }
 254 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
 255
 256 int ux500_pcm_unregister_platform(struct platform_device *pdev)
 257 {
 258         snd_soc_unregister_platform(&pdev->dev);
 259
 260         return 0;
 261 }
 262 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);