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