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