sound/soc/pxa/pxa2xx-i2s.c

   1 /*
   2  * pxa2xx-i2s.c  --  ALSA Soc Audio Layer
   3  *
   4  * Copyright 2005 Wolfson Microelectronics PLC.
   5  * Author: Liam Girdwood
   6  *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  *  Revision history
  14  *    12th Aug 2005   Initial version.
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/device.h>
  20 #include <linux/delay.h>
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/initval.h>
  24 #include <sound/soc.h>
  25
  26 #include <asm/hardware.h>
  27 #include <asm/arch/pxa-regs.h>
  28 #include <asm/arch/audio.h>
  29
  30 #include "pxa2xx-pcm.h"
  31 #include "pxa2xx-i2s.h"
  32
  33 struct pxa_i2s_port {
  34         u32 sadiv;
  35         u32 sacr0;
  36         u32 sacr1;
  37         u32 saimr;
  38         int master;
  39         u32 fmt;
  40 };
  41 static struct pxa_i2s_port pxa_i2s;
  42
  43 static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_out = {
  44         .name                   = "I2S PCM Stereo out",
  45         .dev_addr               = __PREG(SADR),
  46         .drcmr                  = &DRCMRTXSADR,
  47         .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
  48                                   DCMD_BURST32 | DCMD_WIDTH4,
  49 };
  50
  51 static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_in = {
  52         .name                   = "I2S PCM Stereo in",
  53         .dev_addr               = __PREG(SADR),
  54         .drcmr                  = &DRCMRRXSADR,
  55         .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
  56                                   DCMD_BURST32 | DCMD_WIDTH4,
  57 };
  58
  59 static struct pxa2xx_gpio gpio_bus[] = {
  60         { /* I2S SoC Slave */
  61                 .rx = GPIO29_SDATA_IN_I2S_MD,
  62                 .tx = GPIO30_SDATA_OUT_I2S_MD,
  63                 .clk = GPIO28_BITCLK_IN_I2S_MD,
  64                 .frm = GPIO31_SYNC_I2S_MD,
  65         },
  66         { /* I2S SoC Master */
  67 #ifdef CONFIG_PXA27x
  68                 .sys = GPIO113_I2S_SYSCLK_MD,
  69 #else
  70                 .sys = GPIO32_SYSCLK_I2S_MD,
  71 #endif
  72                 .rx = GPIO29_SDATA_IN_I2S_MD,
  73                 .tx = GPIO30_SDATA_OUT_I2S_MD,
  74                 .clk = GPIO28_BITCLK_OUT_I2S_MD,
  75                 .frm = GPIO31_SYNC_I2S_MD,
  76         },
  77 };
  78
  79 static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream)
  80 {
  81         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  82         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
  83
  84         if (!cpu_dai->active) {
  85                 SACR0 |= SACR0_RST;
  86                 SACR0 = 0;
  87         }
  88
  89         return 0;
  90 }
  91
  92 /* wait for I2S controller to be ready */
  93 static int pxa_i2s_wait(void)
  94 {
  95         int i;
  96
  97         /* flush the Rx FIFO */
  98         for(i = 0; i < 16; i++)
  99                 SADR;
 100         return 0;
 101 }
 102
 103 static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
 104                 unsigned int fmt)
 105 {
 106         /* interface format */
 107         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 108         case SND_SOC_DAIFMT_I2S:
 109                 pxa_i2s.fmt = 0;
 110                 break;
 111         case SND_SOC_DAIFMT_LEFT_J:
 112                 pxa_i2s.fmt = SACR1_AMSL;
 113                 break;
 114         }
 115
 116         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 117         case SND_SOC_DAIFMT_CBS_CFS:
 118                 pxa_i2s.master = 1;
 119                 break;
 120         case SND_SOC_DAIFMT_CBM_CFS:
 121                 pxa_i2s.master = 0;
 122                 break;
 123         default:
 124                 break;
 125         }
 126         return 0;
 127 }
 128
 129 static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai,
 130                 int clk_id, unsigned int freq, int dir)
 131 {
 132         if (clk_id != PXA2XX_I2S_SYSCLK)
 133                 return -ENODEV;
 134
 135         if (pxa_i2s.master && dir == SND_SOC_CLOCK_OUT)
 136                 pxa_gpio_mode(gpio_bus[pxa_i2s.master].sys);
 137
 138         return 0;
 139 }
 140
 141 static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
 142                                 struct snd_pcm_hw_params *params)
 143 {
 144         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 145         struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
 146
 147         pxa_gpio_mode(gpio_bus[pxa_i2s.master].rx);
 148         pxa_gpio_mode(gpio_bus[pxa_i2s.master].tx);
 149         pxa_gpio_mode(gpio_bus[pxa_i2s.master].frm);
 150         pxa_gpio_mode(gpio_bus[pxa_i2s.master].clk);
 151         pxa_set_cken(CKEN_I2S, 1);
 152         pxa_i2s_wait();
 153
 154         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 155                 cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_out;
 156         else
 157                 cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_in;
 158
 159         /* is port used by another stream */
 160         if (!(SACR0 & SACR0_ENB)) {
 161
 162                 SACR0 = 0;
 163                 SACR1 = 0;
 164                 if (pxa_i2s.master)
 165                         SACR0 |= SACR0_BCKD;
 166
 167                 SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
 168                 SACR1 |= pxa_i2s.fmt;
 169         }
 170         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 171                 SAIMR |= SAIMR_TFS;
 172         else
 173                 SAIMR |= SAIMR_RFS;
 174
 175         switch (params_rate(params)) {
 176         case 8000:
 177                 SADIV = 0x48;
 178                 break;
 179         case 11025:
 180                 SADIV = 0x34;
 181                 break;
 182         case 16000:
 183                 SADIV = 0x24;
 184                 break;
 185         case 22050:
 186                 SADIV = 0x1a;
 187                 break;
 188         case 44100:
 189                 SADIV = 0xd;
 190                 break;
 191         case 48000:
 192                 SADIV = 0xc;
 193                 break;
 194         case 96000: /* not in manual and possibly slightly inaccurate */
 195                 SADIV = 0x6;
 196                 break;
 197         }
 198
 199         return 0;
 200 }
 201
 202 static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
 203 {
 204         int ret = 0;
 205
 206         switch (cmd) {
 207         case SNDRV_PCM_TRIGGER_START:
 208                 SACR0 |= SACR0_ENB;
 209                 break;
 210         case SNDRV_PCM_TRIGGER_RESUME:
 211         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 212         case SNDRV_PCM_TRIGGER_STOP:
 213         case SNDRV_PCM_TRIGGER_SUSPEND:
 214         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 215                 break;
 216         default:
 217                 ret = -EINVAL;
 218         }
 219
 220         return ret;
 221 }
 222
 223 static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream)
 224 {
 225         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 226                 SACR1 |= SACR1_DRPL;
 227                 SAIMR &= ~SAIMR_TFS;
 228         } else {
 229                 SACR1 |= SACR1_DREC;
 230                 SAIMR &= ~SAIMR_RFS;
 231         }
 232
 233         if (SACR1 & (SACR1_DREC | SACR1_DRPL)) {
 234                 SACR0 &= ~SACR0_ENB;
 235                 pxa_i2s_wait();
 236                 pxa_set_cken(CKEN_I2S, 0);
 237         }
 238 }
 239
 240 #ifdef CONFIG_PM
 241 static int pxa2xx_i2s_suspend(struct platform_device *dev,
 242         struct snd_soc_cpu_dai *dai)
 243 {
 244         if (!dai->active)
 245                 return 0;
 246
 247         /* store registers */
 248         pxa_i2s.sacr0 = SACR0;
 249         pxa_i2s.sacr1 = SACR1;
 250         pxa_i2s.saimr = SAIMR;
 251         pxa_i2s.sadiv = SADIV;
 252
 253         /* deactivate link */
 254         SACR0 &= ~SACR0_ENB;
 255         pxa_i2s_wait();
 256         return 0;
 257 }
 258
 259 static int pxa2xx_i2s_resume(struct platform_device *pdev,
 260         struct snd_soc_cpu_dai *dai)
 261 {
 262         if (!dai->active)
 263                 return 0;
 264
 265         pxa_i2s_wait();
 266
 267         SACR0 = pxa_i2s.sacr0 &= ~SACR0_ENB;
 268         SACR1 = pxa_i2s.sacr1;
 269         SAIMR = pxa_i2s.saimr;
 270         SADIV = pxa_i2s.sadiv;
 271         SACR0 |= SACR0_ENB;
 272
 273         return 0;
 274 }
 275
 276 #else
 277 #define pxa2xx_i2s_suspend      NULL
 278 #define pxa2xx_i2s_resume       NULL
 279 #endif
 280
 281 #define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 282                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
 283                 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
 284
 285 struct snd_soc_cpu_dai pxa_i2s_dai = {
 286         .name = "pxa2xx-i2s",
 287         .id = 0,
 288         .type = SND_SOC_DAI_I2S,
 289         .suspend = pxa2xx_i2s_suspend,
 290         .resume = pxa2xx_i2s_resume,
 291         .playback = {
 292                 .channels_min = 2,
 293                 .channels_max = 2,
 294                 .rates = PXA2XX_I2S_RATES,
 295                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 296         .capture = {
 297                 .channels_min = 2,
 298                 .channels_max = 2,
 299                 .rates = PXA2XX_I2S_RATES,
 300                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 301         .ops = {
 302                 .startup = pxa2xx_i2s_startup,
 303                 .shutdown = pxa2xx_i2s_shutdown,
 304                 .trigger = pxa2xx_i2s_trigger,
 305                 .hw_params = pxa2xx_i2s_hw_params,},
 306         .dai_ops = {
 307                 .set_fmt = pxa2xx_i2s_set_dai_fmt,
 308                 .set_sysclk = pxa2xx_i2s_set_dai_sysclk,
 309         },
 310 };
 311
 312 EXPORT_SYMBOL_GPL(pxa_i2s_dai);
 313
 314 /* Module information */
 315 MODULE_AUTHOR("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com");
 316 MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
 317 MODULE_LICENSE("GPL");