release/src-rt-6.x.4708/linux/linux-2.6.36/sound/soc/omap/omap-mcpdm.c

   1 /*
   2  * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
   3  *
   4  * Copyright (C) 2009 Texas Instruments
   5  *
   6  * Author: Misael Lopez Cruz <x0052729@ti.com>
   7  * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
   8  *          Margarita Olaya <magi.olaya@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  *
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/module.h>
  28 #include <linux/device.h>
  29 #include <sound/core.h>
  30 #include <sound/pcm.h>
  31 #include <sound/pcm_params.h>
  32 #include <sound/initval.h>
  33 #include <sound/soc.h>
  34
  35 #include <plat/control.h>
  36 #include <plat/dma.h>
  37 #include <plat/mcbsp.h>
  38 #include "mcpdm.h"
  39 #include "omap-mcpdm.h"
  40 #include "omap-pcm.h"
  41
  42 struct omap_mcpdm_data {
  43         struct omap_mcpdm_link *links;
  44         int active;
  45 };
  46
  47 static struct omap_mcpdm_link omap_mcpdm_links[] = {
  48         /* downlink */
  49         {
  50                 .irq_mask = MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL,
  51                 .threshold = 1,
  52                 .format = PDMOUTFORMAT_LJUST,
  53         },
  54         /* uplink */
  55         {
  56                 .irq_mask = MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL,
  57                 .threshold = 1,
  58                 .format = PDMOUTFORMAT_LJUST,
  59         },
  60 };
  61
  62 static struct omap_mcpdm_data mcpdm_data = {
  63         .links = omap_mcpdm_links,
  64         .active = 0,
  65 };
  66
  67 /*
  68  * Stream DMA parameters
  69  */
  70 static struct omap_pcm_dma_data omap_mcpdm_dai_dma_params[] = {
  71         {
  72                 .name = "Audio playback",
  73                 .dma_req = OMAP44XX_DMA_MCPDM_DL,
  74                 .data_type = OMAP_DMA_DATA_TYPE_S32,
  75                 .sync_mode = OMAP_DMA_SYNC_PACKET,
  76                 .packet_size = 16,
  77                 .port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_DN_DATA,
  78         },
  79         {
  80                 .name = "Audio capture",
  81                 .dma_req = OMAP44XX_DMA_MCPDM_UP,
  82                 .data_type = OMAP_DMA_DATA_TYPE_S32,
  83                 .sync_mode = OMAP_DMA_SYNC_PACKET,
  84                 .packet_size = 16,
  85                 .port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_UP_DATA,
  86         },
  87 };
  88
  89 static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
  90                                   struct snd_soc_dai *dai)
  91 {
  92         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  93         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  94         int err = 0;
  95
  96         if (!cpu_dai->active)
  97                 err = omap_mcpdm_request();
  98
  99         return err;
 100 }
 101
 102 static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
 103                                     struct snd_soc_dai *dai)
 104 {
 105         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 106         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 107
 108         if (!cpu_dai->active)
 109                 omap_mcpdm_free();
 110 }
 111
 112 static int omap_mcpdm_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 113                                   struct snd_soc_dai *dai)
 114 {
 115         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 116         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 117         struct omap_mcpdm_data *mcpdm_priv = cpu_dai->private_data;
 118         int stream = substream->stream;
 119         int err = 0;
 120
 121         switch (cmd) {
 122         case SNDRV_PCM_TRIGGER_START:
 123         case SNDRV_PCM_TRIGGER_RESUME:
 124         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 125                 if (!mcpdm_priv->active++)
 126                         omap_mcpdm_start(stream);
 127                 break;
 128
 129         case SNDRV_PCM_TRIGGER_STOP:
 130         case SNDRV_PCM_TRIGGER_SUSPEND:
 131         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 132                 if (!--mcpdm_priv->active)
 133                         omap_mcpdm_stop(stream);
 134                 break;
 135         default:
 136                 err = -EINVAL;
 137         }
 138
 139         return err;
 140 }
 141
 142 static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
 143                                     struct snd_pcm_hw_params *params,
 144                                     struct snd_soc_dai *dai)
 145 {
 146         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 147         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 148         struct omap_mcpdm_data *mcpdm_priv = cpu_dai->private_data;
 149         struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
 150         int stream = substream->stream;
 151         int channels, err, link_mask = 0;
 152
 153         snd_soc_dai_set_dma_data(cpu_dai, substream,
 154                                  &omap_mcpdm_dai_dma_params[stream]);
 155
 156         channels = params_channels(params);
 157         switch (channels) {
 158         case 4:
 159                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 160                         /* up to 2 channels for capture */
 161                         return -EINVAL;
 162                 link_mask |= 1 << 3;
 163         case 3:
 164                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 165                         /* up to 2 channels for capture */
 166                         return -EINVAL;
 167                 link_mask |= 1 << 2;
 168         case 2:
 169                 link_mask |= 1 << 1;
 170         case 1:
 171                 link_mask |= 1 << 0;
 172                 break;
 173         default:
 174                 /* unsupported number of channels */
 175                 return -EINVAL;
 176         }
 177
 178         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 179                 mcpdm_links[stream].channels = link_mask << 3;
 180                 err = omap_mcpdm_playback_open(&mcpdm_links[stream]);
 181         } else {
 182                 mcpdm_links[stream].channels = link_mask << 0;
 183                 err = omap_mcpdm_capture_open(&mcpdm_links[stream]);
 184         }
 185
 186         return err;
 187 }
 188
 189 static int omap_mcpdm_dai_hw_free(struct snd_pcm_substream *substream,
 190                                   struct snd_soc_dai *dai)
 191 {
 192         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 193         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 194         struct omap_mcpdm_data *mcpdm_priv = cpu_dai->private_data;
 195         struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
 196         int stream = substream->stream;
 197         int err;
 198
 199         if (substream->stream ==  SNDRV_PCM_STREAM_PLAYBACK)
 200                 err = omap_mcpdm_playback_close(&mcpdm_links[stream]);
 201         else
 202                 err = omap_mcpdm_capture_close(&mcpdm_links[stream]);
 203
 204         return err;
 205 }
 206
 207 static struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
 208         .startup        = omap_mcpdm_dai_startup,
 209         .shutdown       = omap_mcpdm_dai_shutdown,
 210         .trigger        = omap_mcpdm_dai_trigger,
 211         .hw_params      = omap_mcpdm_dai_hw_params,
 212         .hw_free        = omap_mcpdm_dai_hw_free,
 213 };
 214
 215 #define OMAP_MCPDM_RATES        (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 216 #define OMAP_MCPDM_FORMATS      (SNDRV_PCM_FMTBIT_S32_LE)
 217
 218 struct snd_soc_dai omap_mcpdm_dai = {
 219         .name = "omap-mcpdm",
 220         .id = -1,
 221         .playback = {
 222                 .channels_min = 1,
 223                 .channels_max = 4,
 224                 .rates = OMAP_MCPDM_RATES,
 225                 .formats = OMAP_MCPDM_FORMATS,
 226         },
 227         .capture = {
 228                 .channels_min = 1,
 229                 .channels_max = 2,
 230                 .rates = OMAP_MCPDM_RATES,
 231                 .formats = OMAP_MCPDM_FORMATS,
 232         },
 233         .ops = &omap_mcpdm_dai_ops,
 234         .private_data = &mcpdm_data,
 235 };
 236 EXPORT_SYMBOL_GPL(omap_mcpdm_dai);
 237
 238 static int __init snd_omap_mcpdm_init(void)
 239 {
 240         return snd_soc_register_dai(&omap_mcpdm_dai);
 241 }
 242 module_init(snd_omap_mcpdm_init);
 243
 244 static void __exit snd_omap_mcpdm_exit(void)
 245 {
 246         snd_soc_unregister_dai(&omap_mcpdm_dai);
 247 }
 248 module_exit(snd_omap_mcpdm_exit);
 249
 250 MODULE_AUTHOR("Misael Lopez Cruz <x0052729@ti.com>");
 251 MODULE_DESCRIPTION("OMAP PDM SoC Interface");
 252 MODULE_LICENSE("GPL");