sound/soc/blackfin/bf5xx-i2s.c

   1 /*
   2  * File:         sound/soc/blackfin/bf5xx-i2s.c
   3  * Author:       Cliff Cai <Cliff.Cai@analog.com>
   4  *
   5  * Created:      Tue June 06 2008
   6  * Description:  Blackfin I2S CPU DAI driver
   7  *
   8  * Modified:
   9  *               Copyright 2008 Analog Devices Inc.
  10  *
  11  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, see the file COPYING, or write
  25  * to the Free Software Foundation, Inc.,
  26  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  27  */
  28
  29 #include <linux/init.h>
  30 #include <linux/module.h>
  31 #include <linux/device.h>
  32 #include <linux/delay.h>
  33 #include <sound/core.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/initval.h>
  37 #include <sound/soc.h>
  38
  39 #include <asm/irq.h>
  40 #include <asm/portmux.h>
  41 #include <linux/mutex.h>
  42 #include <linux/gpio.h>
  43
  44 #include "bf5xx-sport.h"
  45
  46 struct bf5xx_i2s_port {
  47         u16 tcr1;
  48         u16 rcr1;
  49         u16 tcr2;
  50         u16 rcr2;
  51         int configured;
  52 };
  53
  54 static int bf5xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
  55                 unsigned int fmt)
  56 {
  57         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
  58         struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
  59         int ret = 0;
  60
  61         /* interface format:support I2S,slave mode */
  62         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  63         case SND_SOC_DAIFMT_I2S:
  64                 bf5xx_i2s->tcr1 |= TFSR | TCKFE;
  65                 bf5xx_i2s->rcr1 |= RFSR | RCKFE;
  66                 bf5xx_i2s->tcr2 |= TSFSE;
  67                 bf5xx_i2s->rcr2 |= RSFSE;
  68                 break;
  69         case SND_SOC_DAIFMT_DSP_A:
  70                 bf5xx_i2s->tcr1 |= TFSR;
  71                 bf5xx_i2s->rcr1 |= RFSR;
  72                 break;
  73         case SND_SOC_DAIFMT_LEFT_J:
  74                 ret = -EINVAL;
  75                 break;
  76         default:
  77                 printk(KERN_ERR "%s: Unknown DAI format type\n", __func__);
  78                 ret = -EINVAL;
  79                 break;
  80         }
  81
  82         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  83         case SND_SOC_DAIFMT_CBM_CFM:
  84                 break;
  85         case SND_SOC_DAIFMT_CBS_CFS:
  86         case SND_SOC_DAIFMT_CBM_CFS:
  87         case SND_SOC_DAIFMT_CBS_CFM:
  88                 ret = -EINVAL;
  89                 break;
  90         default:
  91                 printk(KERN_ERR "%s: Unknown DAI master type\n", __func__);
  92                 ret = -EINVAL;
  93                 break;
  94         }
  95
  96         return ret;
  97 }
  98
  99 static int bf5xx_i2s_hw_params(struct snd_pcm_substream *substream,
 100                                 struct snd_pcm_hw_params *params,
 101                                 struct snd_soc_dai *dai)
 102 {
 103         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
 104         struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
 105         int ret = 0;
 106
 107         bf5xx_i2s->tcr2 &= ~0x1f;
 108         bf5xx_i2s->rcr2 &= ~0x1f;
 109         switch (params_format(params)) {
 110         case SNDRV_PCM_FORMAT_S8:
 111                 bf5xx_i2s->tcr2 |= 7;
 112                 bf5xx_i2s->rcr2 |= 7;
 113                 sport_handle->wdsize = 1;
 114         case SNDRV_PCM_FORMAT_S16_LE:
 115                 bf5xx_i2s->tcr2 |= 15;
 116                 bf5xx_i2s->rcr2 |= 15;
 117                 sport_handle->wdsize = 2;
 118                 break;
 119         case SNDRV_PCM_FORMAT_S24_LE:
 120                 bf5xx_i2s->tcr2 |= 23;
 121                 bf5xx_i2s->rcr2 |= 23;
 122                 sport_handle->wdsize = 3;
 123                 break;
 124         case SNDRV_PCM_FORMAT_S32_LE:
 125                 bf5xx_i2s->tcr2 |= 31;
 126                 bf5xx_i2s->rcr2 |= 31;
 127                 sport_handle->wdsize = 4;
 128                 break;
 129         }
 130
 131         if (!bf5xx_i2s->configured) {
 132                 /*
 133                  * TX and RX are not independent,they are enabled at the
 134                  * same time, even if only one side is running. So, we
 135                  * need to configure both of them at the time when the first
 136                  * stream is opened.
 137                  *
 138                  * CPU DAI:slave mode.
 139                  */
 140                 bf5xx_i2s->configured = 1;
 141                 ret = sport_config_rx(sport_handle, bf5xx_i2s->rcr1,
 142                                       bf5xx_i2s->rcr2, 0, 0);
 143                 if (ret) {
 144                         pr_err("SPORT is busy!\n");
 145                         return -EBUSY;
 146                 }
 147
 148                 ret = sport_config_tx(sport_handle, bf5xx_i2s->tcr1,
 149                                       bf5xx_i2s->tcr2, 0, 0);
 150                 if (ret) {
 151                         pr_err("SPORT is busy!\n");
 152                         return -EBUSY;
 153                 }
 154         }
 155
 156         return 0;
 157 }
 158
 159 static void bf5xx_i2s_shutdown(struct snd_pcm_substream *substream,
 160                                struct snd_soc_dai *dai)
 161 {
 162         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
 163         struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
 164
 165         pr_debug("%s enter\n", __func__);
 166         /* No active stream, SPORT is allowed to be configured again. */
 167         if (!dai->active)
 168                 bf5xx_i2s->configured = 0;
 169 }
 170
 171 #ifdef CONFIG_PM
 172 static int bf5xx_i2s_suspend(struct snd_soc_dai *dai)
 173 {
 174         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
 175
 176         pr_debug("%s : sport %d\n", __func__, dai->id);
 177
 178         if (dai->capture_active)
 179                 sport_rx_stop(sport_handle);
 180         if (dai->playback_active)
 181                 sport_tx_stop(sport_handle);
 182         return 0;
 183 }
 184
 185 static int bf5xx_i2s_resume(struct snd_soc_dai *dai)
 186 {
 187         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
 188         struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
 189         int ret;
 190
 191         pr_debug("%s : sport %d\n", __func__, dai->id);
 192
 193         ret = sport_config_rx(sport_handle, bf5xx_i2s->rcr1,
 194                                       bf5xx_i2s->rcr2, 0, 0);
 195         if (ret) {
 196                 pr_err("SPORT is busy!\n");
 197                 return -EBUSY;
 198         }
 199
 200         ret = sport_config_tx(sport_handle, bf5xx_i2s->tcr1,
 201                                       bf5xx_i2s->tcr2, 0, 0);
 202         if (ret) {
 203                 pr_err("SPORT is busy!\n");
 204                 return -EBUSY;
 205         }
 206
 207         return 0;
 208 }
 209
 210 #else
 211 #define bf5xx_i2s_suspend       NULL
 212 #define bf5xx_i2s_resume        NULL
 213 #endif
 214
 215 #define BF5XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 216                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
 217                 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
 218                 SNDRV_PCM_RATE_96000)
 219
 220 #define BF5XX_I2S_FORMATS \
 221         (SNDRV_PCM_FMTBIT_S8 | \
 222          SNDRV_PCM_FMTBIT_S16_LE | \
 223          SNDRV_PCM_FMTBIT_S24_LE | \
 224          SNDRV_PCM_FMTBIT_S32_LE)
 225
 226 static struct snd_soc_dai_ops bf5xx_i2s_dai_ops = {
 227         .shutdown       = bf5xx_i2s_shutdown,
 228         .hw_params      = bf5xx_i2s_hw_params,
 229         .set_fmt        = bf5xx_i2s_set_dai_fmt,
 230 };
 231
 232 static struct snd_soc_dai_driver bf5xx_i2s_dai = {
 233         .suspend = bf5xx_i2s_suspend,
 234         .resume = bf5xx_i2s_resume,
 235         .playback = {
 236                 .channels_min = 1,
 237                 .channels_max = 2,
 238                 .rates = BF5XX_I2S_RATES,
 239                 .formats = BF5XX_I2S_FORMATS,},
 240         .capture = {
 241                 .channels_min = 1,
 242                 .channels_max = 2,
 243                 .rates = BF5XX_I2S_RATES,
 244                 .formats = BF5XX_I2S_FORMATS,},
 245         .ops = &bf5xx_i2s_dai_ops,
 246 };
 247
 248 static int __devinit bf5xx_i2s_probe(struct platform_device *pdev)
 249 {
 250         struct sport_device *sport_handle;
 251         int ret;
 252
 253         /* configure SPORT for I2S */
 254         sport_handle = sport_init(pdev, 4, 2 * sizeof(u32),
 255                 sizeof(struct bf5xx_i2s_port));
 256         if (!sport_handle)
 257                 return -ENODEV;
 258
 259         /* register with the ASoC layers */
 260         ret = snd_soc_register_dai(&pdev->dev, &bf5xx_i2s_dai);
 261         if (ret) {
 262                 pr_err("Failed to register DAI: %d\n", ret);
 263                 sport_done(sport_handle);
 264                 return ret;
 265         }
 266
 267         return 0;
 268 }
 269
 270 static int __devexit bf5xx_i2s_remove(struct platform_device *pdev)
 271 {
 272         struct sport_device *sport_handle = platform_get_drvdata(pdev);
 273
 274         pr_debug("%s enter\n", __func__);
 275
 276         snd_soc_unregister_dai(&pdev->dev);
 277         sport_done(sport_handle);
 278
 279         return 0;
 280 }
 281
 282 static struct platform_driver bfin_i2s_driver = {
 283         .probe  = bf5xx_i2s_probe,
 284         .remove = __devexit_p(bf5xx_i2s_remove),
 285         .driver = {
 286                 .name = "bfin-i2s",
 287                 .owner = THIS_MODULE,
 288         },
 289 };
 290
 291 static int __init bfin_i2s_init(void)
 292 {
 293         return platform_driver_register(&bfin_i2s_driver);
 294 }
 295
 296 static void __exit bfin_i2s_exit(void)
 297 {
 298         platform_driver_unregister(&bfin_i2s_driver);
 299 }
 300
 301 module_init(bfin_i2s_init);
 302 module_exit(bfin_i2s_exit);
 303
 304 /* Module information */
 305 MODULE_AUTHOR("Cliff Cai");
 306 MODULE_DESCRIPTION("I2S driver for ADI Blackfin");
 307 MODULE_LICENSE("GPL");
 308