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- /*
- * pxa2xx-i2s.c -- ALSA Soc Audio Layer
- *
- * Copyright 2005 Wolfson Microelectronics PLC.
- * Author: Liam Girdwood
- * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * Revision history
- * 12th Aug 2005 Initial version.
- */
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/device.h>
- #include <linux/delay.h>
- #include <sound/driver.h>
- #include <sound/core.h>
- #include <sound/pcm.h>
- #include <sound/initval.h>
- #include <sound/soc.h>
- #include <asm/hardware.h>
- #include <asm/arch/pxa-regs.h>
- #include <asm/arch/audio.h>
- #include "pxa2xx-pcm.h"
- #include "pxa2xx-i2s.h"
- struct pxa_i2s_port {
- u32 sadiv;
- u32 sacr0;
- u32 sacr1;
- u32 saimr;
- int master;
- u32 fmt;
- };
- static struct pxa_i2s_port pxa_i2s;
- static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_out = {
- .name = "I2S PCM Stereo out",
- .dev_addr = __PREG(SADR),
- .drcmr = &DRCMRTXSADR,
- .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
- DCMD_BURST32 | DCMD_WIDTH4,
- };
- static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_in = {
- .name = "I2S PCM Stereo in",
- .dev_addr = __PREG(SADR),
- .drcmr = &DRCMRRXSADR,
- .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
- DCMD_BURST32 | DCMD_WIDTH4,
- };
- static struct pxa2xx_gpio gpio_bus[] = {
- { /* I2S SoC Slave */
- .rx = GPIO29_SDATA_IN_I2S_MD,
- .tx = GPIO30_SDATA_OUT_I2S_MD,
- .clk = GPIO28_BITCLK_IN_I2S_MD,
- .frm = GPIO31_SYNC_I2S_MD,
- },
- { /* I2S SoC Master */
- #ifdef CONFIG_PXA27x
- .sys = GPIO113_I2S_SYSCLK_MD,
- #else
- .sys = GPIO32_SYSCLK_I2S_MD,
- #endif
- .rx = GPIO29_SDATA_IN_I2S_MD,
- .tx = GPIO30_SDATA_OUT_I2S_MD,
- .clk = GPIO28_BITCLK_OUT_I2S_MD,
- .frm = GPIO31_SYNC_I2S_MD,
- },
- };
- static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream)
- {
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
- if (!cpu_dai->active) {
- SACR0 |= SACR0_RST;
- SACR0 = 0;
- }
- return 0;
- }
- /* wait for I2S controller to be ready */
- static int pxa_i2s_wait(void)
- {
- int i;
- /* flush the Rx FIFO */
- for(i = 0; i < 16; i++)
- SADR;
- return 0;
- }
- static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
- unsigned int fmt)
- {
- /* interface format */
- switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
- case SND_SOC_DAIFMT_I2S:
- pxa_i2s.fmt = 0;
- break;
- case SND_SOC_DAIFMT_LEFT_J:
- pxa_i2s.fmt = SACR1_AMSL;
- break;
- }
- switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
- case SND_SOC_DAIFMT_CBS_CFS:
- pxa_i2s.master = 1;
- break;
- case SND_SOC_DAIFMT_CBM_CFS:
- pxa_i2s.master = 0;
- break;
- default:
- break;
- }
- return 0;
- }
- static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai,
- int clk_id, unsigned int freq, int dir)
- {
- if (clk_id != PXA2XX_I2S_SYSCLK)
- return -ENODEV;
- if (pxa_i2s.master && dir == SND_SOC_CLOCK_OUT)
- pxa_gpio_mode(gpio_bus[pxa_i2s.master].sys);
- return 0;
- }
- static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
- {
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
- pxa_gpio_mode(gpio_bus[pxa_i2s.master].rx);
- pxa_gpio_mode(gpio_bus[pxa_i2s.master].tx);
- pxa_gpio_mode(gpio_bus[pxa_i2s.master].frm);
- pxa_gpio_mode(gpio_bus[pxa_i2s.master].clk);
- pxa_set_cken(CKEN8_I2S, 1);
- pxa_i2s_wait();
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_out;
- else
- cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_in;
- /* is port used by another stream */
- if (!(SACR0 & SACR0_ENB)) {
- SACR0 = 0;
- SACR1 = 0;
- if (pxa_i2s.master)
- SACR0 |= SACR0_BCKD;
- SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
- SACR1 |= pxa_i2s.fmt;
- }
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- SAIMR |= SAIMR_TFS;
- else
- SAIMR |= SAIMR_RFS;
- switch (params_rate(params)) {
- case 8000:
- SADIV = 0x48;
- break;
- case 11025:
- SADIV = 0x34;
- break;
- case 16000:
- SADIV = 0x24;
- break;
- case 22050:
- SADIV = 0x1a;
- break;
- case 44100:
- SADIV = 0xd;
- break;
- case 48000:
- SADIV = 0xc;
- break;
- case 96000: /* not in manual and possibly slightly inaccurate */
- SADIV = 0x6;
- break;
- }
- return 0;
- }
- static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
- {
- int ret = 0;
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
- SACR0 |= SACR0_ENB;
- break;
- case SNDRV_PCM_TRIGGER_RESUME:
- case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- case SNDRV_PCM_TRIGGER_STOP:
- case SNDRV_PCM_TRIGGER_SUSPEND:
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- break;
- default:
- ret = -EINVAL;
- }
- return ret;
- }
- static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream)
- {
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- SACR1 |= SACR1_DRPL;
- SAIMR &= ~SAIMR_TFS;
- } else {
- SACR1 |= SACR1_DREC;
- SAIMR &= ~SAIMR_RFS;
- }
- if (SACR1 & (SACR1_DREC | SACR1_DRPL)) {
- SACR0 &= ~SACR0_ENB;
- pxa_i2s_wait();
- pxa_set_cken(CKEN8_I2S, 0);
- }
- }
- #ifdef CONFIG_PM
- static int pxa2xx_i2s_suspend(struct platform_device *dev,
- struct snd_soc_cpu_dai *dai)
- {
- if (!dai->active)
- return 0;
- /* store registers */
- pxa_i2s.sacr0 = SACR0;
- pxa_i2s.sacr1 = SACR1;
- pxa_i2s.saimr = SAIMR;
- pxa_i2s.sadiv = SADIV;
- /* deactivate link */
- SACR0 &= ~SACR0_ENB;
- pxa_i2s_wait();
- return 0;
- }
- static int pxa2xx_i2s_resume(struct platform_device *pdev,
- struct snd_soc_cpu_dai *dai)
- {
- if (!dai->active)
- return 0;
- pxa_i2s_wait();
- SACR0 = pxa_i2s.sacr0 &= ~SACR0_ENB;
- SACR1 = pxa_i2s.sacr1;
- SAIMR = pxa_i2s.saimr;
- SADIV = pxa_i2s.sadiv;
- SACR0 |= SACR0_ENB;
- return 0;
- }
- #else
- #define pxa2xx_i2s_suspend NULL
- #define pxa2xx_i2s_resume NULL
- #endif
- #define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
- SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
- SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
- struct snd_soc_cpu_dai pxa_i2s_dai = {
- .name = "pxa2xx-i2s",
- .id = 0,
- .type = SND_SOC_DAI_I2S,
- .suspend = pxa2xx_i2s_suspend,
- .resume = pxa2xx_i2s_resume,
- .playback = {
- .channels_min = 2,
- .channels_max = 2,
- .rates = PXA2XX_I2S_RATES,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,},
- .capture = {
- .channels_min = 2,
- .channels_max = 2,
- .rates = PXA2XX_I2S_RATES,
- .formats = SNDRV_PCM_FMTBIT_S16_LE,},
- .ops = {
- .startup = pxa2xx_i2s_startup,
- .shutdown = pxa2xx_i2s_shutdown,
- .trigger = pxa2xx_i2s_trigger,
- .hw_params = pxa2xx_i2s_hw_params,},
- .dai_ops = {
- .set_fmt = pxa2xx_i2s_set_dai_fmt,
- .set_sysclk = pxa2xx_i2s_set_dai_sysclk,
- },
- };
- EXPORT_SYMBOL_GPL(pxa_i2s_dai);
- /* Module information */
- MODULE_AUTHOR("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com");
- MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
- MODULE_LICENSE("GPL");
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