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