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