SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/device.h>
  17 #include <linux/delay.h>
  18 #include <linux/clk.h>
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/initval.h>
  22 #include <sound/soc.h>
  23
  24 #include <asm/hardware.h>
  25 #include <asm/arch/pxa-regs.h>
  26 #include <asm/arch/pxa2xx-gpio.h>
  27 #include <asm/arch/audio.h>
  28
  29 #include "pxa2xx-pcm.h"
  30 #include "pxa2xx-i2s.h"
  31
  32 struct pxa_i2s_port {
  33         u32 sadiv;
  34         u32 sacr0;
  35         u32 sacr1;
  36         u32 saimr;
  37         int master;
  38         u32 fmt;
  39 };
  40 static struct pxa_i2s_port pxa_i2s;
  41 static struct clk *clk_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_dai *cpu_dai = rtd->dai->cpu_dai;
  83
  84         clk_i2s = clk_get(NULL, "I2SCLK");
  85         if (IS_ERR(clk_i2s))
  86                 return PTR_ERR(clk_i2s);
  87
  88         if (!cpu_dai->active) {
  89                 SACR0 |= SACR0_RST;
  90                 SACR0 = 0;
  91         }
  92
  93         return 0;
  94 }
  95
  96 /* wait for I2S controller to be ready */
  97 static int pxa_i2s_wait(void)
  98 {
  99         int i;
 100
 101         /* flush the Rx FIFO */
 102         for(i = 0; i < 16; i++)
 103                 SADR;
 104         return 0;
 105 }
 106
 107 static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 108                 unsigned int fmt)
 109 {
 110         /* interface format */
 111         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 112         case SND_SOC_DAIFMT_I2S:
 113                 pxa_i2s.fmt = 0;
 114                 break;
 115         case SND_SOC_DAIFMT_LEFT_J:
 116                 pxa_i2s.fmt = SACR1_AMSL;
 117                 break;
 118         }
 119
 120         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 121         case SND_SOC_DAIFMT_CBS_CFS:
 122                 pxa_i2s.master = 1;
 123                 break;
 124         case SND_SOC_DAIFMT_CBM_CFS:
 125                 pxa_i2s.master = 0;
 126                 break;
 127         default:
 128                 break;
 129         }
 130         return 0;
 131 }
 132
 133 static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 134                 int clk_id, unsigned int freq, int dir)
 135 {
 136         if (clk_id != PXA2XX_I2S_SYSCLK)
 137                 return -ENODEV;
 138
 139         if (pxa_i2s.master && dir == SND_SOC_CLOCK_OUT)
 140                 pxa_gpio_mode(gpio_bus[pxa_i2s.master].sys);
 141
 142         return 0;
 143 }
 144
 145 static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
 146                                 struct snd_pcm_hw_params *params)
 147 {
 148         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 149         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 150
 151         pxa_gpio_mode(gpio_bus[pxa_i2s.master].rx);
 152         pxa_gpio_mode(gpio_bus[pxa_i2s.master].tx);
 153         pxa_gpio_mode(gpio_bus[pxa_i2s.master].frm);
 154         pxa_gpio_mode(gpio_bus[pxa_i2s.master].clk);
 155         clk_enable(clk_i2s);
 156         pxa_i2s_wait();
 157
 158         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 159                 cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_out;
 160         else
 161                 cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_in;
 162
 163         /* is port used by another stream */
 164         if (!(SACR0 & SACR0_ENB)) {
 165
 166                 SACR0 = 0;
 167                 SACR1 = 0;
 168                 if (pxa_i2s.master)
 169                         SACR0 |= SACR0_BCKD;
 170
 171                 SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
 172                 SACR1 |= pxa_i2s.fmt;
 173         }
 174         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 175                 SAIMR |= SAIMR_TFS;
 176         else
 177                 SAIMR |= SAIMR_RFS;
 178
 179         switch (params_rate(params)) {
 180         case 8000:
 181                 SADIV = 0x48;
 182                 break;
 183         case 11025:
 184                 SADIV = 0x34;
 185                 break;
 186         case 16000:
 187                 SADIV = 0x24;
 188                 break;
 189         case 22050:
 190                 SADIV = 0x1a;
 191                 break;
 192         case 44100:
 193                 SADIV = 0xd;
 194                 break;
 195         case 48000:
 196                 SADIV = 0xc;
 197                 break;
 198         case 96000: /* not in manual and possibly slightly inaccurate */
 199                 SADIV = 0x6;
 200                 break;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
 207 {
 208         int ret = 0;
 209
 210         switch (cmd) {
 211         case SNDRV_PCM_TRIGGER_START:
 212                 SACR0 |= SACR0_ENB;
 213                 break;
 214         case SNDRV_PCM_TRIGGER_RESUME:
 215         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 216         case SNDRV_PCM_TRIGGER_STOP:
 217         case SNDRV_PCM_TRIGGER_SUSPEND:
 218         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 219                 break;
 220         default:
 221                 ret = -EINVAL;
 222         }
 223
 224         return ret;
 225 }
 226
 227 static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream)
 228 {
 229         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 230                 SACR1 |= SACR1_DRPL;
 231                 SAIMR &= ~SAIMR_TFS;
 232         } else {
 233                 SACR1 |= SACR1_DREC;
 234                 SAIMR &= ~SAIMR_RFS;
 235         }
 236
 237         if (SACR1 & (SACR1_DREC | SACR1_DRPL)) {
 238                 SACR0 &= ~SACR0_ENB;
 239                 pxa_i2s_wait();
 240                 clk_disable(clk_i2s);
 241         }
 242
 243         clk_put(clk_i2s);
 244 }
 245
 246 #ifdef CONFIG_PM
 247 static int pxa2xx_i2s_suspend(struct platform_device *dev,
 248         struct snd_soc_dai *dai)
 249 {
 250         if (!dai->active)
 251                 return 0;
 252
 253         /* store registers */
 254         pxa_i2s.sacr0 = SACR0;
 255         pxa_i2s.sacr1 = SACR1;
 256         pxa_i2s.saimr = SAIMR;
 257         pxa_i2s.sadiv = SADIV;
 258
 259         /* deactivate link */
 260         SACR0 &= ~SACR0_ENB;
 261         pxa_i2s_wait();
 262         return 0;
 263 }
 264
 265 static int pxa2xx_i2s_resume(struct platform_device *pdev,
 266         struct snd_soc_dai *dai)
 267 {
 268         if (!dai->active)
 269                 return 0;
 270
 271         pxa_i2s_wait();
 272
 273         SACR0 = pxa_i2s.sacr0 &= ~SACR0_ENB;
 274         SACR1 = pxa_i2s.sacr1;
 275         SAIMR = pxa_i2s.saimr;
 276         SADIV = pxa_i2s.sadiv;
 277         SACR0 |= SACR0_ENB;
 278
 279         return 0;
 280 }
 281
 282 #else
 283 #define pxa2xx_i2s_suspend      NULL
 284 #define pxa2xx_i2s_resume       NULL
 285 #endif
 286
 287 #define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 288                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
 289                 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
 290
 291 struct snd_soc_dai pxa_i2s_dai = {
 292         .name = "pxa2xx-i2s",
 293         .id = 0,
 294         .type = SND_SOC_DAI_I2S,
 295         .suspend = pxa2xx_i2s_suspend,
 296         .resume = pxa2xx_i2s_resume,
 297         .playback = {
 298                 .channels_min = 2,
 299                 .channels_max = 2,
 300                 .rates = PXA2XX_I2S_RATES,
 301                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 302         .capture = {
 303                 .channels_min = 2,
 304                 .channels_max = 2,
 305                 .rates = PXA2XX_I2S_RATES,
 306                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 307         .ops = {
 308                 .startup = pxa2xx_i2s_startup,
 309                 .shutdown = pxa2xx_i2s_shutdown,
 310                 .trigger = pxa2xx_i2s_trigger,
 311                 .hw_params = pxa2xx_i2s_hw_params,},
 312         .dai_ops = {
 313                 .set_fmt = pxa2xx_i2s_set_dai_fmt,
 314                 .set_sysclk = pxa2xx_i2s_set_dai_sysclk,
 315         },
 316 };
 317
 318 EXPORT_SYMBOL_GPL(pxa_i2s_dai);
 319
 320 /* Module information */
 321 MODULE_AUTHOR("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com");
 322 MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
 323 MODULE_LICENSE("GPL");