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 #include "bf5xx-i2s.h"
  46
  47 struct bf5xx_i2s_port {
  48         u16 tcr1;
  49         u16 rcr1;
  50         u16 tcr2;
  51         u16 rcr2;
  52         int counter;
  53         int configured;
  54 };
  55
  56 static struct bf5xx_i2s_port bf5xx_i2s;
  57 static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;
  58
  59 static struct sport_param sport_params[2] = {
  60         {
  61                 .dma_rx_chan    = CH_SPORT0_RX,
  62                 .dma_tx_chan    = CH_SPORT0_TX,
  63                 .err_irq        = IRQ_SPORT0_ERROR,
  64                 .regs           = (struct sport_register *)SPORT0_TCR1,
  65         },
  66         {
  67                 .dma_rx_chan    = CH_SPORT1_RX,
  68                 .dma_tx_chan    = CH_SPORT1_TX,
  69                 .err_irq        = IRQ_SPORT1_ERROR,
  70                 .regs           = (struct sport_register *)SPORT1_TCR1,
  71         }
  72 };
  73
  74 /*
  75  * Setting the TFS pin selector for SPORT 0 based on whether the selected
  76  * port id F or G. If the port is F then no conflict should exist for the
  77  * TFS. When Port G is selected and EMAC then there is a conflict between
  78  * the PHY interrupt line and TFS.  Current settings prevent the conflict
  79  * by ignoring the TFS pin when Port G is selected. This allows both
  80  * ssm2602 using Port G and EMAC concurrently.
  81  */
  82 #ifdef CONFIG_BF527_SPORT0_PORTF
  83 #define LOCAL_SPORT0_TFS (P_SPORT0_TFS)
  84 #else
  85 #define LOCAL_SPORT0_TFS (0)
  86 #endif
  87
  88 static u16 sport_req[][7] = { {P_SPORT0_DTPRI, P_SPORT0_TSCLK, P_SPORT0_RFS,
  89                 P_SPORT0_DRPRI, P_SPORT0_RSCLK, LOCAL_SPORT0_TFS, 0},
  90                 {P_SPORT1_DTPRI, P_SPORT1_TSCLK, P_SPORT1_RFS, P_SPORT1_DRPRI,
  91                 P_SPORT1_RSCLK, P_SPORT1_TFS, 0} };
  92
  93 static int bf5xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
  94                 unsigned int fmt)
  95 {
  96         int ret = 0;
  97
  98         /* interface format:support I2S,slave mode */
  99         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 100         case SND_SOC_DAIFMT_I2S:
 101                 bf5xx_i2s.tcr1 |= TFSR | TCKFE;
 102                 bf5xx_i2s.rcr1 |= RFSR | RCKFE;
 103                 bf5xx_i2s.tcr2 |= TSFSE;
 104                 bf5xx_i2s.rcr2 |= RSFSE;
 105                 break;
 106         case SND_SOC_DAIFMT_DSP_A:
 107                 bf5xx_i2s.tcr1 |= TFSR;
 108                 bf5xx_i2s.rcr1 |= RFSR;
 109                 break;
 110         case SND_SOC_DAIFMT_LEFT_J:
 111                 ret = -EINVAL;
 112                 break;
 113         default:
 114                 printk(KERN_ERR "%s: Unknown DAI format type\n", __func__);
 115                 ret = -EINVAL;
 116                 break;
 117         }
 118
 119         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 120         case SND_SOC_DAIFMT_CBM_CFM:
 121                 break;
 122         case SND_SOC_DAIFMT_CBS_CFS:
 123         case SND_SOC_DAIFMT_CBM_CFS:
 124         case SND_SOC_DAIFMT_CBS_CFM:
 125                 ret = -EINVAL;
 126                 break;
 127         default:
 128                 printk(KERN_ERR "%s: Unknown DAI master type\n", __func__);
 129                 ret = -EINVAL;
 130                 break;
 131         }
 132
 133         return ret;
 134 }
 135
 136 static int bf5xx_i2s_startup(struct snd_pcm_substream *substream,
 137                              struct snd_soc_dai *dai)
 138 {
 139         pr_debug("%s enter\n", __func__);
 140
 141         /*this counter is used for counting how many pcm streams are opened*/
 142         bf5xx_i2s.counter++;
 143         return 0;
 144 }
 145
 146 static int bf5xx_i2s_hw_params(struct snd_pcm_substream *substream,
 147                                 struct snd_pcm_hw_params *params,
 148                                 struct snd_soc_dai *dai)
 149 {
 150         int ret = 0;
 151
 152         bf5xx_i2s.tcr2 &= ~0x1f;
 153         bf5xx_i2s.rcr2 &= ~0x1f;
 154         switch (params_format(params)) {
 155         case SNDRV_PCM_FORMAT_S16_LE:
 156                 bf5xx_i2s.tcr2 |= 15;
 157                 bf5xx_i2s.rcr2 |= 15;
 158                 sport_handle->wdsize = 2;
 159                 break;
 160         case SNDRV_PCM_FORMAT_S24_LE:
 161                 bf5xx_i2s.tcr2 |= 23;
 162                 bf5xx_i2s.rcr2 |= 23;
 163                 sport_handle->wdsize = 3;
 164                 break;
 165         case SNDRV_PCM_FORMAT_S32_LE:
 166                 bf5xx_i2s.tcr2 |= 31;
 167                 bf5xx_i2s.rcr2 |= 31;
 168                 sport_handle->wdsize = 4;
 169                 break;
 170         }
 171
 172         if (!bf5xx_i2s.configured) {
 173                 /*
 174                  * TX and RX are not independent,they are enabled at the
 175                  * same time, even if only one side is running. So, we
 176                  * need to configure both of them at the time when the first
 177                  * stream is opened.
 178                  *
 179                  * CPU DAI:slave mode.
 180                  */
 181                 bf5xx_i2s.configured = 1;
 182                 ret = sport_config_rx(sport_handle, bf5xx_i2s.rcr1,
 183                                       bf5xx_i2s.rcr2, 0, 0);
 184                 if (ret) {
 185                         pr_err("SPORT is busy!\n");
 186                         return -EBUSY;
 187                 }
 188
 189                 ret = sport_config_tx(sport_handle, bf5xx_i2s.tcr1,
 190                                       bf5xx_i2s.tcr2, 0, 0);
 191                 if (ret) {
 192                         pr_err("SPORT is busy!\n");
 193                         return -EBUSY;
 194                 }
 195         }
 196
 197         return 0;
 198 }
 199
 200 static void bf5xx_i2s_shutdown(struct snd_pcm_substream *substream,
 201                                struct snd_soc_dai *dai)
 202 {
 203         pr_debug("%s enter\n", __func__);
 204         bf5xx_i2s.counter--;
 205         /* No active stream, SPORT is allowed to be configured again. */
 206         if (!bf5xx_i2s.counter)
 207                 bf5xx_i2s.configured = 0;
 208 }
 209
 210 static int bf5xx_i2s_probe(struct platform_device *pdev,
 211                            struct snd_soc_dai *dai)
 212 {
 213         pr_debug("%s enter\n", __func__);
 214         if (peripheral_request_list(&sport_req[sport_num][0], "soc-audio")) {
 215                 pr_err("Requesting Peripherals failed\n");
 216                 return -EFAULT;
 217         }
 218
 219         /* request DMA for SPORT */
 220         sport_handle = sport_init(&sport_params[sport_num], 4, \
 221                         2 * sizeof(u32), NULL);
 222         if (!sport_handle) {
 223                 peripheral_free_list(&sport_req[sport_num][0]);
 224                 return -ENODEV;
 225         }
 226
 227         return 0;
 228 }
 229
 230 static void bf5xx_i2s_remove(struct snd_soc_dai *dai)
 231 {
 232         pr_debug("%s enter\n", __func__);
 233         peripheral_free_list(&sport_req[sport_num][0]);
 234 }
 235
 236 #ifdef CONFIG_PM
 237 static int bf5xx_i2s_suspend(struct snd_soc_dai *dai)
 238 {
 239         struct sport_device *sport =
 240                 (struct sport_device *)dai->private_data;
 241
 242         pr_debug("%s : sport %d\n", __func__, dai->id);
 243         if (!dai->active)
 244                 return 0;
 245         if (dai->capture.active)
 246                 sport_rx_stop(sport);
 247         if (dai->playback.active)
 248                 sport_tx_stop(sport);
 249         return 0;
 250 }
 251
 252 static int bf5xx_i2s_resume(struct snd_soc_dai *dai)
 253 {
 254         int ret;
 255         struct sport_device *sport =
 256                 (struct sport_device *)dai->private_data;
 257
 258         pr_debug("%s : sport %d\n", __func__, dai->id);
 259         if (!dai->active)
 260                 return 0;
 261
 262         ret = sport_config_rx(sport_handle, RFSR | RCKFE, RSFSE|0x1f, 0, 0);
 263         if (ret) {
 264                 pr_err("SPORT is busy!\n");
 265                 return -EBUSY;
 266         }
 267
 268         ret = sport_config_tx(sport_handle, TFSR | TCKFE, TSFSE|0x1f, 0, 0);
 269         if (ret) {
 270                 pr_err("SPORT is busy!\n");
 271                 return -EBUSY;
 272         }
 273
 274         if (dai->capture.active)
 275                 sport_rx_start(sport);
 276         if (dai->playback.active)
 277                 sport_tx_start(sport);
 278         return 0;
 279 }
 280
 281 #else
 282 #define bf5xx_i2s_suspend       NULL
 283 #define bf5xx_i2s_resume        NULL
 284 #endif
 285
 286 #define BF5XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 287                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
 288                 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
 289                 SNDRV_PCM_RATE_96000)
 290
 291 #define BF5XX_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |\
 292         SNDRV_PCM_FMTBIT_S32_LE)
 293
 294 static struct snd_soc_dai_ops bf5xx_i2s_dai_ops = {
 295         .startup        = bf5xx_i2s_startup,
 296         .shutdown       = bf5xx_i2s_shutdown,
 297         .hw_params      = bf5xx_i2s_hw_params,
 298         .set_fmt        = bf5xx_i2s_set_dai_fmt,
 299 };
 300
 301 struct snd_soc_dai bf5xx_i2s_dai = {
 302         .name = "bf5xx-i2s",
 303         .id = 0,
 304         .probe = bf5xx_i2s_probe,
 305         .remove = bf5xx_i2s_remove,
 306         .suspend = bf5xx_i2s_suspend,
 307         .resume = bf5xx_i2s_resume,
 308         .playback = {
 309                 .channels_min = 1,
 310                 .channels_max = 2,
 311                 .rates = BF5XX_I2S_RATES,
 312                 .formats = BF5XX_I2S_FORMATS,},
 313         .capture = {
 314                 .channels_min = 1,
 315                 .channels_max = 2,
 316                 .rates = BF5XX_I2S_RATES,
 317                 .formats = BF5XX_I2S_FORMATS,},
 318         .ops = &bf5xx_i2s_dai_ops,
 319 };
 320 EXPORT_SYMBOL_GPL(bf5xx_i2s_dai);
 321
 322 static int __init bfin_i2s_init(void)
 323 {
 324         return snd_soc_register_dai(&bf5xx_i2s_dai);
 325 }
 326 module_init(bfin_i2s_init);
 327
 328 static void __exit bfin_i2s_exit(void)
 329 {
 330         snd_soc_unregister_dai(&bf5xx_i2s_dai);
 331 }
 332 module_exit(bfin_i2s_exit);
 333
 334 /* Module information */
 335 MODULE_AUTHOR("Cliff Cai");
 336 MODULE_DESCRIPTION("I2S driver for ADI Blackfin");
 337 MODULE_LICENSE("GPL");
 338