[ALSA] ASoC pxa2xx I2S support

This patch adds pxa2xx I2S ASoC audio support. Features:-
 o Supports playback/capture
 o 16 bit PCM
 o 8k - 96k sample rates
 o Supports master and slave mode.
From: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/soc/pxa/pxa2xx-i2s.c

+/*
+ * 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"
+
+/* used to disable sysclk if external crystal is used */
+static int extclk;
+module_param(extclk, int, 0);
+MODULE_PARM_DESC(extclk, "set to 1 to disable pxa2xx i2s sysclk");
+
+struct pxa_i2s_port {
+	u32 sadiv;
+	u32 sacr0;
+	u32 sacr1;
+	u32 saimr;
+	int master;
+};
+static struct pxa_i2s_port pxa_i2s;
+
+#define PXA_I2S_DAIFMT \
+	(SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_NB_NF)
+
+#define PXA_I2S_DIR \
+	(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
+
+#define PXA_I2S_RATES \
+	(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
+	SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+	SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
+
+/* priv is divider */
+static struct snd_soc_dai_mode pxa2xx_i2s_modes[] = {
+	/* pxa2xx I2S frame and clock master modes */
+	{PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+		SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_8000, PXA_I2S_DIR,
+		SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0x48},
+	{PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+		SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_11025, PXA_I2S_DIR,
+		SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0x34},
+	{PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+		SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_16000, PXA_I2S_DIR,
+		SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0x24},
+	{PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+		SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_22050, PXA_I2S_DIR,
+		SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0x1a},
+	{PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+		SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_44100, PXA_I2S_DIR,
+		SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0xd},
+	{PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBS_CFS, SND_SOC_DAITDM_LRDW(0,0),
+		SNDRV_PCM_FMTBIT_S16_LE, SNDRV_PCM_RATE_48000, PXA_I2S_DIR,
+		SND_SOC_DAI_BFS_DIV, 256, SND_SOC_FSBD(4), 0xc},
+
+	/* pxa2xx I2S frame master and clock slave mode */
+	{PXA_I2S_DAIFMT | SND_SOC_DAIFMT_CBM_CFS, SND_SOC_DAITDM_LRDW(0,0),
+		SNDRV_PCM_FMTBIT_S16_LE, PXA_I2S_RATES, PXA_I2S_DIR, 0,
+		SND_SOC_FS_ALL, SND_SOC_FSB(64), 0x48},
+
+};
+
+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;
+
+	if (!rtd->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_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+	pxa_i2s.master = 0;
+	if (rtd->cpu_dai->dai_runtime.fmt & SND_SOC_DAIFMT_CBS_CFS)
+		pxa_i2s.master = 1;
+
+	if (pxa_i2s.master && !extclk)
+		pxa_gpio_mode(gpio_bus[pxa_i2s.master].sys);
+
+	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)
+		rtd->cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_out;
+	else
+		rtd->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);
+
+		if (rtd->cpu_dai->dai_runtime.fmt & SND_SOC_DAIFMT_LEFT_J)
+			SACR1 |= SACR1_AMSL;
+	}
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		SAIMR |= SAIMR_TFS;
+	else
+		SAIMR |= SAIMR_RFS;
+
+	SADIV = rtd->cpu_dai->dai_runtime.priv;
+	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
+
+/* pxa2xx I2S sysclock is always 256 FS */
+static unsigned int pxa_i2s_config_sysclk(struct snd_soc_cpu_dai *iface,
+	struct snd_soc_clock_info *info, unsigned int clk)
+{
+	return info->rate << 8;
+}
+
+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,
+	.config_sysclk = pxa_i2s_config_sysclk,
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,},
+	.capture = {
+		.channels_min = 2,
+		.channels_max = 2,},
+	.ops = {
+		.startup = pxa2xx_i2s_startup,
+		.shutdown = pxa2xx_i2s_shutdown,
+		.trigger = pxa2xx_i2s_trigger,
+		.hw_params = pxa2xx_i2s_hw_params,},
+	.caps = {
+		.num_modes = ARRAY_SIZE(pxa2xx_i2s_modes),
+		.mode = pxa2xx_i2s_modes,},
+};
+
+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");