sound/soc/imx/imx-pcm-dma-mx2.c

   1 /*
   2  * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
   3  *
   4  * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
   5  *
   6  * This code is based on code copyrighted by Freescale,
   7  * Liam Girdwood, Javier Martin and probably others.
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  */
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/initval.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include <sound/soc.h>
  29
  30 #include <mach/dma-mx1-mx2.h>
  31
  32 #include "imx-ssi.h"
  33
  34 struct imx_pcm_runtime_data {
  35         int sg_count;
  36         struct scatterlist *sg_list;
  37         int period;
  38         int periods;
  39         unsigned long dma_addr;
  40         int dma;
  41         struct snd_pcm_substream *substream;
  42         unsigned long offset;
  43         unsigned long size;
  44         unsigned long period_cnt;
  45         void *buf;
  46         int period_time;
  47 };
  48
  49 /* Called by the DMA framework when a period has elapsed */
  50 static void imx_ssi_dma_progression(int channel, void *data,
  51                                         struct scatterlist *sg)
  52 {
  53         struct snd_pcm_substream *substream = data;
  54         struct snd_pcm_runtime *runtime = substream->runtime;
  55         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  56
  57         if (!sg)
  58                 return;
  59
  60         runtime = iprtd->substream->runtime;
  61
  62         iprtd->offset = sg->dma_address - runtime->dma_addr;
  63
  64         snd_pcm_period_elapsed(iprtd->substream);
  65 }
  66
  67 static void imx_ssi_dma_callback(int channel, void *data)
  68 {
  69         pr_err("%s shouldn't be called\n", __func__);
  70 }
  71
  72 static void snd_imx_dma_err_callback(int channel, void *data, int err)
  73 {
  74         struct snd_pcm_substream *substream = data;
  75         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  76         struct imx_pcm_dma_params *dma_params =
  77                 snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
  78         struct snd_pcm_runtime *runtime = substream->runtime;
  79         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
  80         int ret;
  81
  82         pr_err("DMA timeout on channel %d -%s%s%s%s\n",
  83                  channel,
  84                  err & IMX_DMA_ERR_BURST ?    " burst" : "",
  85                  err & IMX_DMA_ERR_REQUEST ?  " request" : "",
  86                  err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
  87                  err & IMX_DMA_ERR_BUFFER ?   " buffer" : "");
  88
  89         imx_dma_disable(iprtd->dma);
  90         ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
  91                         IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
  92                         substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
  93                         DMA_MODE_WRITE : DMA_MODE_READ);
  94         if (!ret)
  95                 imx_dma_enable(iprtd->dma);
  96 }
  97
  98 static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
  99 {
 100         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 101         struct imx_pcm_dma_params *dma_params;
 102         struct snd_pcm_runtime *runtime = substream->runtime;
 103         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 104         int ret;
 105
 106         dma_params = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
 107
 108         iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
 109         if (iprtd->dma < 0) {
 110                 pr_err("Failed to claim the audio DMA\n");
 111                 return -ENODEV;
 112         }
 113
 114         ret = imx_dma_setup_handlers(iprtd->dma,
 115                                 imx_ssi_dma_callback,
 116                                 snd_imx_dma_err_callback, substream);
 117         if (ret)
 118                 goto out;
 119
 120         ret = imx_dma_setup_progression_handler(iprtd->dma,
 121                         imx_ssi_dma_progression);
 122         if (ret) {
 123                 pr_err("Failed to setup the DMA handler\n");
 124                 goto out;
 125         }
 126
 127         ret = imx_dma_config_channel(iprtd->dma,
 128                         IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
 129                         IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
 130                         dma_params->dma, 1);
 131         if (ret < 0) {
 132                 pr_err("Cannot configure DMA channel: %d\n", ret);
 133                 goto out;
 134         }
 135
 136         imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
 137
 138         return 0;
 139 out:
 140         imx_dma_free(iprtd->dma);
 141         return ret;
 142 }
 143
 144 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
 145                                 struct snd_pcm_hw_params *params)
 146 {
 147         struct snd_pcm_runtime *runtime = substream->runtime;
 148         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 149         int i;
 150         unsigned long dma_addr;
 151
 152         imx_ssi_dma_alloc(substream);
 153
 154         iprtd->size = params_buffer_bytes(params);
 155         iprtd->periods = params_periods(params);
 156         iprtd->period = params_period_bytes(params);
 157         iprtd->offset = 0;
 158         iprtd->period_time = HZ / (params_rate(params) /
 159                         params_period_size(params));
 160
 161         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 162
 163         if (iprtd->sg_count != iprtd->periods) {
 164                 kfree(iprtd->sg_list);
 165
 166                 iprtd->sg_list = kcalloc(iprtd->periods + 1,
 167                                 sizeof(struct scatterlist), GFP_KERNEL);
 168                 if (!iprtd->sg_list)
 169                         return -ENOMEM;
 170                 iprtd->sg_count = iprtd->periods + 1;
 171         }
 172
 173         sg_init_table(iprtd->sg_list, iprtd->sg_count);
 174         dma_addr = runtime->dma_addr;
 175
 176         for (i = 0; i < iprtd->periods; i++) {
 177                 iprtd->sg_list[i].page_link = 0;
 178                 iprtd->sg_list[i].offset = 0;
 179                 iprtd->sg_list[i].dma_address = dma_addr;
 180                 iprtd->sg_list[i].length = iprtd->period;
 181                 dma_addr += iprtd->period;
 182         }
 183
 184         /* close the loop */
 185         iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
 186         iprtd->sg_list[iprtd->sg_count - 1].length = 0;
 187         iprtd->sg_list[iprtd->sg_count - 1].page_link =
 188                         ((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
 189         return 0;
 190 }
 191
 192 static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
 193 {
 194         struct snd_pcm_runtime *runtime = substream->runtime;
 195         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 196
 197         if (iprtd->dma >= 0) {
 198                 imx_dma_free(iprtd->dma);
 199                 iprtd->dma = -EINVAL;
 200         }
 201
 202         kfree(iprtd->sg_list);
 203         iprtd->sg_list = NULL;
 204
 205         return 0;
 206 }
 207
 208 static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
 209 {
 210         struct snd_pcm_runtime *runtime = substream->runtime;
 211         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 212         struct imx_pcm_dma_params *dma_params;
 213         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 214         int err;
 215
 216         dma_params = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
 217
 218         iprtd->substream = substream;
 219         iprtd->buf = (unsigned int *)substream->dma_buffer.area;
 220         iprtd->period_cnt = 0;
 221
 222         pr_debug("%s: buf: %p period: %d periods: %d\n",
 223                         __func__, iprtd->buf, iprtd->period, iprtd->periods);
 224
 225         err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
 226                         IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
 227                         substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 228                         DMA_MODE_WRITE : DMA_MODE_READ);
 229         if (err)
 230                 return err;
 231
 232         return 0;
 233 }
 234
 235 static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 236 {
 237         struct snd_pcm_runtime *runtime = substream->runtime;
 238         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 239
 240         switch (cmd) {
 241         case SNDRV_PCM_TRIGGER_START:
 242         case SNDRV_PCM_TRIGGER_RESUME:
 243         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 244                 imx_dma_enable(iprtd->dma);
 245
 246                 break;
 247
 248         case SNDRV_PCM_TRIGGER_STOP:
 249         case SNDRV_PCM_TRIGGER_SUSPEND:
 250         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 251                 imx_dma_disable(iprtd->dma);
 252
 253                 break;
 254         default:
 255                 return -EINVAL;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
 262 {
 263         struct snd_pcm_runtime *runtime = substream->runtime;
 264         struct imx_pcm_runtime_data *iprtd = runtime->private_data;
 265
 266         return bytes_to_frames(substream->runtime, iprtd->offset);
 267 }
 268
 269 static struct snd_pcm_hardware snd_imx_hardware = {
 270         .info = SNDRV_PCM_INFO_INTERLEAVED |
 271                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 272                 SNDRV_PCM_INFO_MMAP |
 273                 SNDRV_PCM_INFO_MMAP_VALID |
 274                 SNDRV_PCM_INFO_PAUSE |
 275                 SNDRV_PCM_INFO_RESUME,
 276         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 277         .rate_min = 8000,
 278         .channels_min = 2,
 279         .channels_max = 2,
 280         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 281         .period_bytes_min = 128,
 282         .period_bytes_max = 16 * 1024,
 283         .periods_min = 2,
 284         .periods_max = 255,
 285         .fifo_size = 0,
 286 };
 287
 288 static int snd_imx_open(struct snd_pcm_substream *substream)
 289 {
 290         struct snd_pcm_runtime *runtime = substream->runtime;
 291         struct imx_pcm_runtime_data *iprtd;
 292         int ret;
 293
 294         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
 295         runtime->private_data = iprtd;
 296
 297         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 298                         SNDRV_PCM_HW_PARAM_PERIODS);
 299         if (ret < 0)
 300                 return ret;
 301
 302         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 303         return 0;
 304 }
 305
 306 static struct snd_pcm_ops imx_pcm_ops = {
 307         .open           = snd_imx_open,
 308         .ioctl          = snd_pcm_lib_ioctl,
 309         .hw_params      = snd_imx_pcm_hw_params,
 310         .hw_free        = snd_imx_pcm_hw_free,
 311         .prepare        = snd_imx_pcm_prepare,
 312         .trigger        = snd_imx_pcm_trigger,
 313         .pointer        = snd_imx_pcm_pointer,
 314         .mmap           = snd_imx_pcm_mmap,
 315 };
 316
 317 static struct snd_soc_platform imx_soc_platform_dma = {
 318         .name           = "imx-audio",
 319         .pcm_ops        = &imx_pcm_ops,
 320         .pcm_new        = imx_pcm_new,
 321         .pcm_free       = imx_pcm_free,
 322 };
 323
 324 struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
 325                 struct imx_ssi *ssi)
 326 {
 327         ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
 328         ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
 329
 330         return &imx_soc_platform_dma;
 331 }
 332