[net-next-2.6.git] / sound / soc / imx / imx-ssi.c

/*
 * imx-ssi.c  --  ALSA Soc Audio Layer
 *
 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
 *
 * This code is based on code copyrighted by Freescale,
 * Liam Girdwood, Javier Martin and probably others.
 *
 *  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.
 *
 *
 * The i.MX SSI core has some nasty limitations in AC97 mode. While most
 * sane processor vendors have a FIFO per AC97 slot, the i.MX has only
 * one FIFO which combines all valid receive slots. We cannot even select
 * which slots we want to receive. The WM9712 with which this driver
 * was developped with always sends GPIO status data in slot 12 which
 * we receive in our (PCM-) data stream. The only chance we have is to
 * manually skip this data in the FIQ handler. With sampling rates different
 * from 48000Hz not every frame has valid receive data, so the ratio
 * between pcm data and GPIO status data changes. Our FIQ handler is not
 * able to handle this, hence this driver only works with 48000Hz sampling
 * rate.
 * Reading and writing AC97 registers is another challange. The core
 * provides us status bits when the read register is updated with *another*
 * value. When we read the same register two times (and the register still
 * contains the same value) these status bits are not set. We work
 * around this by not polling these bits but only wait a fixed delay.
 * 
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <mach/ssi.h>
#include <mach/hardware.h>

#include "imx-ssi.h"

#define SSI_SACNT_DEFAULT (SSI_SACNT_AC97EN | SSI_SACNT_FV)

/*
 * SSI Network Mode or TDM slots configuration.
 * Should only be called when port is inactive (i.e. SSIEN = 0).
 */
static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
	unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
{
	struct imx_ssi *ssi = cpu_dai->private_data;
	u32 sccr;

	sccr = readl(ssi->base + SSI_STCCR);
	sccr &= ~SSI_STCCR_DC_MASK;
	sccr |= SSI_STCCR_DC(slots - 1);
	writel(sccr, ssi->base + SSI_STCCR);

	sccr = readl(ssi->base + SSI_SRCCR);
	sccr &= ~SSI_STCCR_DC_MASK;
	sccr |= SSI_STCCR_DC(slots - 1);
	writel(sccr, ssi->base + SSI_SRCCR);

	writel(tx_mask, ssi->base + SSI_STMSK);
	writel(rx_mask, ssi->base + SSI_SRMSK);

	return 0;
}

/*
 * SSI DAI format configuration.
 * Should only be called when port is inactive (i.e. SSIEN = 0).
 * Note: We don't use the I2S modes but instead manually configure the
 * SSI for I2S because the I2S mode is only a register preset.
 */
static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
{
	struct imx_ssi *ssi = cpu_dai->private_data;
	u32 strcr = 0, scr;

	scr = readl(ssi->base + SSI_SCR) & ~(SSI_SCR_SYN | SSI_SCR_NET);

	/* DAI mode */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		/* data on rising edge of bclk, frame low 1clk before data */
		strcr |= SSI_STCR_TFSI | SSI_STCR_TEFS | SSI_STCR_TXBIT0;
		scr |= SSI_SCR_NET;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		/* data on rising edge of bclk, frame high with data */
		strcr |= SSI_STCR_TXBIT0;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		/* data on rising edge of bclk, frame high with data */
		strcr |= SSI_STCR_TFSL;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		/* data on rising edge of bclk, frame high 1clk before data */
		strcr |= SSI_STCR_TFSL | SSI_STCR_TEFS;
		break;
	}

	/* DAI clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_IB_IF:
		strcr |= SSI_STCR_TFSI;
		strcr &= ~SSI_STCR_TSCKP;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		strcr &= ~(SSI_STCR_TSCKP | SSI_STCR_TFSI);
		break;
	case SND_SOC_DAIFMT_NB_IF:
		strcr |= SSI_STCR_TFSI | SSI_STCR_TSCKP;
		break;
	case SND_SOC_DAIFMT_NB_NF:
		strcr &= ~SSI_STCR_TFSI;
		strcr |= SSI_STCR_TSCKP;
		break;
	}

	/* DAI clock master masks */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		break;
	default:
		/* Master mode not implemented, needs handling of clocks. */
		return -EINVAL;
	}

	strcr |= SSI_STCR_TFEN0;

	writel(strcr, ssi->base + SSI_STCR);
	writel(strcr, ssi->base + SSI_SRCR);
	writel(scr, ssi->base + SSI_SCR);

	return 0;
}

/*
 * SSI system clock configuration.
 * Should only be called when port is inactive (i.e. SSIEN = 0).
 */
static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
				  int clk_id, unsigned int freq, int dir)
{
	struct imx_ssi *ssi = cpu_dai->private_data;
	u32 scr;

	scr = readl(ssi->base + SSI_SCR);

	switch (clk_id) {
	case IMX_SSP_SYS_CLK:
		if (dir == SND_SOC_CLOCK_OUT)
			scr |= SSI_SCR_SYS_CLK_EN;
		else
			scr &= ~SSI_SCR_SYS_CLK_EN;
		break;
	default:
		return -EINVAL;
	}

	writel(scr, ssi->base + SSI_SCR);

	return 0;
}

/*
 * SSI Clock dividers
 * Should only be called when port is inactive (i.e. SSIEN = 0).
 */
static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
				  int div_id, int div)
{
	struct imx_ssi *ssi = cpu_dai->private_data;
	u32 stccr, srccr;

	stccr = readl(ssi->base + SSI_STCCR);
	srccr = readl(ssi->base + SSI_SRCCR);

	switch (div_id) {
	case IMX_SSI_TX_DIV_2:
		stccr &= ~SSI_STCCR_DIV2;
		stccr |= div;
		break;
	case IMX_SSI_TX_DIV_PSR:
		stccr &= ~SSI_STCCR_PSR;
		stccr |= div;
		break;
	case IMX_SSI_TX_DIV_PM:
		stccr &= ~0xff;
		stccr |= SSI_STCCR_PM(div);
		break;
	case IMX_SSI_RX_DIV_2:
		stccr &= ~SSI_STCCR_DIV2;
		stccr |= div;
		break;
	case IMX_SSI_RX_DIV_PSR:
		stccr &= ~SSI_STCCR_PSR;
		stccr |= div;
		break;
	case IMX_SSI_RX_DIV_PM:
		stccr &= ~0xff;
		stccr |= SSI_STCCR_PM(div);
		break;
	default:
		return -EINVAL;
	}

	writel(stccr, ssi->base + SSI_STCCR);
	writel(srccr, ssi->base + SSI_SRCCR);

	return 0;
}

/*
 * Should only be called when port is inactive (i.e. SSIEN = 0),
 * although can be called multiple times by upper layers.
 */
static int imx_ssi_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params,
			     struct snd_soc_dai *cpu_dai)
{
	struct imx_ssi *ssi = cpu_dai->private_data;
	struct imx_pcm_dma_params *dma_data;
	u32 reg, sccr;

	/* Tx/Rx config */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		reg = SSI_STCCR;
		dma_data = &ssi->dma_params_tx;
	} else {
		reg = SSI_SRCCR;
		dma_data = &ssi->dma_params_rx;
	}

	snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);

	sccr = readl(ssi->base + reg) & ~SSI_STCCR_WL_MASK;

	/* DAI data (word) size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		sccr |= SSI_SRCCR_WL(16);
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		sccr |= SSI_SRCCR_WL(20);
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		sccr |= SSI_SRCCR_WL(24);
		break;
	}

	writel(sccr, ssi->base + reg);

	return 0;
}

static int imx_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
		struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
	struct imx_ssi *ssi = cpu_dai->private_data;
	unsigned int sier_bits, sier;
	unsigned int scr;

	scr = readl(ssi->base + SSI_SCR);
	sier = readl(ssi->base + SSI_SIER);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		if (ssi->flags & IMX_SSI_DMA)
			sier_bits = SSI_SIER_TDMAE;
		else
			sier_bits = SSI_SIER_TIE | SSI_SIER_TFE0_EN;
	} else {
		if (ssi->flags & IMX_SSI_DMA)
			sier_bits = SSI_SIER_RDMAE;
		else
			sier_bits = SSI_SIER_RIE | SSI_SIER_RFF0_EN;
	}

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			scr |= SSI_SCR_TE;
		else
			scr |= SSI_SCR_RE;
		sier |= sier_bits;

		if (++ssi->enabled == 1)
			scr |= SSI_SCR_SSIEN;

		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			scr &= ~SSI_SCR_TE;
		else
			scr &= ~SSI_SCR_RE;
		sier &= ~sier_bits;

		if (--ssi->enabled == 0)
			scr &= ~SSI_SCR_SSIEN;

		break;
	default:
		return -EINVAL;
	}

	if (!(ssi->flags & IMX_SSI_USE_AC97))
		/* rx/tx are always enabled to access ac97 registers */
		writel(scr, ssi->base + SSI_SCR);

	writel(sier, ssi->base + SSI_SIER);

	return 0;
}

static struct snd_soc_dai_ops imx_ssi_pcm_dai_ops = {
	.hw_params	= imx_ssi_hw_params,
	.set_fmt	= imx_ssi_set_dai_fmt,
	.set_clkdiv	= imx_ssi_set_dai_clkdiv,
	.set_sysclk	= imx_ssi_set_dai_sysclk,
	.set_tdm_slot	= imx_ssi_set_dai_tdm_slot,
	.trigger	= imx_ssi_trigger,
};

static struct snd_soc_dai imx_ssi_dai = {
	.playback = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_96000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.capture = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_96000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &imx_ssi_pcm_dai_ops,
};

int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
		struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int ret;

	ret = dma_mmap_coherent(NULL, vma, runtime->dma_area,
			runtime->dma_addr, runtime->dma_bytes);

	pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
			runtime->dma_area,
			runtime->dma_addr,
			runtime->dma_bytes);
	return ret;
}

static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	struct snd_dma_buffer *buf = &substream->dma_buffer;
	size_t size = IMX_SSI_DMABUF_SIZE;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
					   &buf->addr, GFP_KERNEL);
	if (!buf->area)
		return -ENOMEM;
	buf->bytes = size;

	return 0;
}

static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);

int imx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
	struct snd_pcm *pcm)
{

	int ret = 0;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &imx_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
	if (dai->playback.channels_min) {
		ret = imx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (dai->capture.channels_min) {
		ret = imx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}

out:
	return ret;
}

void imx_pcm_free(struct snd_pcm *pcm)
{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;
	int stream;

	for (stream = 0; stream < 2; stream++) {
		substream = pcm->streams[stream].substream;
		if (!substream)
			continue;

		buf = &substream->dma_buffer;
		if (!buf->area)
			continue;

		dma_free_writecombine(pcm->card->dev, buf->bytes,
				      buf->area, buf->addr);
		buf->area = NULL;
	}
}

struct snd_soc_platform imx_soc_platform = {
	.name		= "imx-audio",
};
EXPORT_SYMBOL_GPL(imx_soc_platform);

static struct snd_soc_dai imx_ac97_dai = {
	.name = "AC97",
	.ac97_control = 1,
	.playback = {
		.stream_name = "AC97 Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.capture = {
		.stream_name = "AC97 Capture",
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &imx_ssi_pcm_dai_ops,
};

static void setup_channel_to_ac97(struct imx_ssi *imx_ssi)
{
	void __iomem *base = imx_ssi->base;

	writel(0x0, base + SSI_SCR);
	writel(0x0, base + SSI_STCR);
	writel(0x0, base + SSI_SRCR);

	writel(SSI_SCR_SYN | SSI_SCR_NET, base + SSI_SCR);

	writel(SSI_SFCSR_RFWM0(8) |
		SSI_SFCSR_TFWM0(8) |
		SSI_SFCSR_RFWM1(8) |
		SSI_SFCSR_TFWM1(8), base + SSI_SFCSR);

	writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_STCCR);
	writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_SRCCR);

	writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN, base + SSI_SCR);
	writel(SSI_SOR_WAIT(3), base + SSI_SOR);

	writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN |
			SSI_SCR_TE | SSI_SCR_RE,
			base + SSI_SCR);

	writel(SSI_SACNT_DEFAULT, base + SSI_SACNT);
	writel(0xff, base + SSI_SACCDIS);
	writel(0x300, base + SSI_SACCEN);
}

static struct imx_ssi *ac97_ssi;

static void imx_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
		unsigned short val)
{
	struct imx_ssi *imx_ssi = ac97_ssi;
	void __iomem *base = imx_ssi->base;
	unsigned int lreg;
	unsigned int lval;

	if (reg > 0x7f)
		return;

	pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);

	lreg = reg <<  12;
	writel(lreg, base + SSI_SACADD);

	lval = val << 4;
	writel(lval , base + SSI_SACDAT);

	writel(SSI_SACNT_DEFAULT | SSI_SACNT_WR, base + SSI_SACNT);
	udelay(100);
}

static unsigned short imx_ssi_ac97_read(struct snd_ac97 *ac97,
		unsigned short reg)
{
	struct imx_ssi *imx_ssi = ac97_ssi;
	void __iomem *base = imx_ssi->base;

	unsigned short val = -1;
	unsigned int lreg;

	lreg = (reg & 0x7f) <<  12 ;
	writel(lreg, base + SSI_SACADD);
	writel(SSI_SACNT_DEFAULT | SSI_SACNT_RD, base + SSI_SACNT);

	udelay(100);

	val = (readl(base + SSI_SACDAT) >> 4) & 0xffff;

	pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);

	return val;
}

static void imx_ssi_ac97_reset(struct snd_ac97 *ac97)
{
	struct imx_ssi *imx_ssi = ac97_ssi;

	if (imx_ssi->ac97_reset)
		imx_ssi->ac97_reset(ac97);
}

static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97)
{
	struct imx_ssi *imx_ssi = ac97_ssi;

	if (imx_ssi->ac97_warm_reset)
		imx_ssi->ac97_warm_reset(ac97);
}

struct snd_ac97_bus_ops soc_ac97_ops = {
	.read		= imx_ssi_ac97_read,
	.write		= imx_ssi_ac97_write,
	.reset		= imx_ssi_ac97_reset,
	.warm_reset	= imx_ssi_ac97_warm_reset
};
EXPORT_SYMBOL_GPL(soc_ac97_ops);

struct snd_soc_dai imx_ssi_pcm_dai[2];
EXPORT_SYMBOL_GPL(imx_ssi_pcm_dai);

static int imx_ssi_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct imx_ssi *ssi;
	struct imx_ssi_platform_data *pdata = pdev->dev.platform_data;
	struct snd_soc_platform *platform;
	int ret = 0;
	unsigned int val;
	struct snd_soc_dai *dai = &imx_ssi_pcm_dai[pdev->id];

	if (dai->id >= ARRAY_SIZE(imx_ssi_pcm_dai))
		return -EINVAL;

	ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
	if (!ssi)
		return -ENOMEM;

	if (pdata) {
		ssi->ac97_reset = pdata->ac97_reset;
		ssi->ac97_warm_reset = pdata->ac97_warm_reset;
		ssi->flags = pdata->flags;
	}

	ssi->irq = platform_get_irq(pdev, 0);

	ssi->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(ssi->clk)) {
		ret = PTR_ERR(ssi->clk);
		dev_err(&pdev->dev, "Cannot get the clock: %d\n",
			ret);
		goto failed_clk;
	}
	clk_enable(ssi->clk);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -ENODEV;
		goto failed_get_resource;
	}

	if (!request_mem_region(res->start, resource_size(res), DRV_NAME)) {
		dev_err(&pdev->dev, "request_mem_region failed\n");
		ret = -EBUSY;
		goto failed_get_resource;
	}

	ssi->base = ioremap(res->start, resource_size(res));
	if (!ssi->base) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENODEV;
		goto failed_ioremap;
	}

	if (ssi->flags & IMX_SSI_USE_AC97) {
		if (ac97_ssi) {
			ret = -EBUSY;
			goto failed_ac97;
		}
		ac97_ssi = ssi;
		setup_channel_to_ac97(ssi);
		memcpy(dai, &imx_ac97_dai, sizeof(imx_ac97_dai));
	} else
		memcpy(dai, &imx_ssi_dai, sizeof(imx_ssi_dai));

	writel(0x0, ssi->base + SSI_SIER);

	ssi->dma_params_rx.dma_addr = res->start + SSI_SRX0;
	ssi->dma_params_tx.dma_addr = res->start + SSI_STX0;

	res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx0");
	if (res)
		ssi->dma_params_tx.dma = res->start;

	res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx0");
	if (res)
		ssi->dma_params_rx.dma = res->start;

	dai->id = pdev->id;
	dai->dev = &pdev->dev;
	dai->name = kasprintf(GFP_KERNEL, "imx-ssi.%d", pdev->id);
	dai->private_data = ssi;

	if ((cpu_is_mx27() || cpu_is_mx21()) &&
			!(ssi->flags & IMX_SSI_USE_AC97)) {
		ssi->flags |= IMX_SSI_DMA;
		platform = imx_ssi_dma_mx2_init(pdev, ssi);
	} else
		platform = imx_ssi_fiq_init(pdev, ssi);

	imx_soc_platform.pcm_ops = platform->pcm_ops;
	imx_soc_platform.pcm_new = platform->pcm_new;
	imx_soc_platform.pcm_free = platform->pcm_free;

	val = SSI_SFCSR_TFWM0(ssi->dma_params_tx.burstsize) |
		SSI_SFCSR_RFWM0(ssi->dma_params_rx.burstsize);
	writel(val, ssi->base + SSI_SFCSR);

	ret = snd_soc_register_dai(dai);
	if (ret) {
		dev_err(&pdev->dev, "register DAI failed\n");
		goto failed_register;
	}

	platform_set_drvdata(pdev, ssi);

	return 0;

failed_register:
failed_ac97:
	iounmap(ssi->base);
failed_ioremap:
	release_mem_region(res->start, resource_size(res));
failed_get_resource:
	clk_disable(ssi->clk);
	clk_put(ssi->clk);
failed_clk:
	kfree(ssi);

	return ret;
}

static int __devexit imx_ssi_remove(struct platform_device *pdev)
{
	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	struct imx_ssi *ssi = platform_get_drvdata(pdev);
	struct snd_soc_dai *dai = &imx_ssi_pcm_dai[pdev->id];

	snd_soc_unregister_dai(dai);

	if (ssi->flags & IMX_SSI_USE_AC97)
		ac97_ssi = NULL;

	if (!(ssi->flags & IMX_SSI_DMA))
		imx_ssi_fiq_exit(pdev, ssi);

	iounmap(ssi->base);
	release_mem_region(res->start, resource_size(res));
	clk_disable(ssi->clk);
	clk_put(ssi->clk);
	kfree(ssi);

	return 0;
}

static struct platform_driver imx_ssi_driver = {
	.probe = imx_ssi_probe,
	.remove = __devexit_p(imx_ssi_remove),

	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
	},
};

static int __init imx_ssi_init(void)
{
	int ret;

	ret = snd_soc_register_platform(&imx_soc_platform);
	if (ret) {
		pr_err("failed to register soc platform: %d\n", ret);
		return ret;
	}

	ret = platform_driver_register(&imx_ssi_driver);
	if (ret) {
		snd_soc_unregister_platform(&imx_soc_platform);
		return ret;
	}

	return 0;
}

static void __exit imx_ssi_exit(void)
{
	platform_driver_unregister(&imx_ssi_driver);
	snd_soc_unregister_platform(&imx_soc_platform);
}

module_init(imx_ssi_init);
module_exit(imx_ssi_exit);

/* Module information */
MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>");
MODULE_DESCRIPTION("i.MX I2S/ac97 SoC Interface");
MODULE_LICENSE("GPL");
Commit	Line	Data
8380222e SH	1	/*
	2	* imx-ssi.c -- ALSA Soc Audio Layer
	3	*
	4	* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
	5	*
	6	* This code is based on code copyrighted by Freescale,
	7	* Liam Girdwood, Javier Martin and probably others.
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
	13	*
	14	*
	15	* The i.MX SSI core has some nasty limitations in AC97 mode. While most
	16	* sane processor vendors have a FIFO per AC97 slot, the i.MX has only
	17	* one FIFO which combines all valid receive slots. We cannot even select
	18	* which slots we want to receive. The WM9712 with which this driver
	19	* was developped with always sends GPIO status data in slot 12 which
	20	* we receive in our (PCM-) data stream. The only chance we have is to
	21	* manually skip this data in the FIQ handler. With sampling rates different
	22	* from 48000Hz not every frame has valid receive data, so the ratio
	23	* between pcm data and GPIO status data changes. Our FIQ handler is not
	24	* able to handle this, hence this driver only works with 48000Hz sampling
	25	* rate.
	26	* Reading and writing AC97 registers is another challange. The core
	27	* provides us status bits when the read register is updated with another
	28	* value. When we read the same register two times (and the register still
	29	* contains the same value) these status bits are not set. We work
	30	* around this by not polling these bits but only wait a fixed delay.
	31	*
	32	*/
	33
	34	#include <linux/clk.h>
	35	#include <linux/delay.h>
	36	#include <linux/device.h>
	37	#include <linux/dma-mapping.h>
	38	#include <linux/init.h>
	39	#include <linux/interrupt.h>
	40	#include <linux/module.h>
	41	#include <linux/platform_device.h>
	42
	43	#include <sound/core.h>
	44	#include <sound/initval.h>
	45	#include <sound/pcm.h>
	46	#include <sound/pcm_params.h>
	47	#include <sound/soc.h>
	48
	49	#include <mach/ssi.h>
	50	#include <mach/hardware.h>
	51
	52	#include "imx-ssi.h"
	53
	54	#define SSI_SACNT_DEFAULT (SSI_SACNT_AC97EN \| SSI_SACNT_FV)
	55
	56	/*
	57	* SSI Network Mode or TDM slots configuration.
	58	* Should only be called when port is inactive (i.e. SSIEN = 0).
	59	*/
	60	static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
	61	unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
	62	{
48dbc419	63	struct imx_ssi *ssi = cpu_dai->private_data;
8380222e SH	64	u32 sccr;
	65
	66	sccr = readl(ssi->base + SSI_STCCR);
	67	sccr &= ~SSI_STCCR_DC_MASK;
	68	sccr \|= SSI_STCCR_DC(slots - 1);
	69	writel(sccr, ssi->base + SSI_STCCR);
	70
	71	sccr = readl(ssi->base + SSI_SRCCR);
	72	sccr &= ~SSI_STCCR_DC_MASK;
	73	sccr \|= SSI_STCCR_DC(slots - 1);
	74	writel(sccr, ssi->base + SSI_SRCCR);
	75
	76	writel(tx_mask, ssi->base + SSI_STMSK);
	77	writel(rx_mask, ssi->base + SSI_SRMSK);
	78
	79	return 0;
	80	}
	81
	82	/*
	83	* SSI DAI format configuration.
	84	* Should only be called when port is inactive (i.e. SSIEN = 0).
	85	* Note: We don't use the I2S modes but instead manually configure the
	86	* SSI for I2S because the I2S mode is only a register preset.
	87	*/
	88	static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
	89	{
48dbc419	90	struct imx_ssi *ssi = cpu_dai->private_data;
8380222e SH	91	u32 strcr = 0, scr;
	92
	93	scr = readl(ssi->base + SSI_SCR) & ~(SSI_SCR_SYN \| SSI_SCR_NET);
	94
	95	/* DAI mode */
	96	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	97	case SND_SOC_DAIFMT_I2S:
	98	/* data on rising edge of bclk, frame low 1clk before data */
	99	strcr \|= SSI_STCR_TFSI \| SSI_STCR_TEFS \| SSI_STCR_TXBIT0;
	100	scr \|= SSI_SCR_NET;
	101	break;
	102	case SND_SOC_DAIFMT_LEFT_J:
	103	/* data on rising edge of bclk, frame high with data */
	104	strcr \|= SSI_STCR_TXBIT0;
	105	break;
	106	case SND_SOC_DAIFMT_DSP_B:
	107	/* data on rising edge of bclk, frame high with data */
	108	strcr \|= SSI_STCR_TFSL;
	109	break;
	110	case SND_SOC_DAIFMT_DSP_A:
	111	/* data on rising edge of bclk, frame high 1clk before data */
	112	strcr \|= SSI_STCR_TFSL \| SSI_STCR_TEFS;
	113	break;
	114	}
	115
	116	/* DAI clock inversion */
	117	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	118	case SND_SOC_DAIFMT_IB_IF:
	119	strcr \|= SSI_STCR_TFSI;
	120	strcr &= ~SSI_STCR_TSCKP;
	121	break;
	122	case SND_SOC_DAIFMT_IB_NF:
	123	strcr &= ~(SSI_STCR_TSCKP \| SSI_STCR_TFSI);
	124	break;
	125	case SND_SOC_DAIFMT_NB_IF:
	126	strcr \|= SSI_STCR_TFSI \| SSI_STCR_TSCKP;
	127	break;
	128	case SND_SOC_DAIFMT_NB_NF:
	129	strcr &= ~SSI_STCR_TFSI;
	130	strcr \|= SSI_STCR_TSCKP;
	131	break;
	132	}
	133
	134	/* DAI clock master masks */
	135	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
d08a68bf	136	case SND_SOC_DAIFMT_CBM_CFM:
8380222e	137	break;
d08a68bf MB	138	default:
	139	/* Master mode not implemented, needs handling of clocks. */
	140	return -EINVAL;
8380222e SH	141	}
	142
	143	strcr \|= SSI_STCR_TFEN0;
	144
	145	writel(strcr, ssi->base + SSI_STCR);
	146	writel(strcr, ssi->base + SSI_SRCR);
	147	writel(scr, ssi->base + SSI_SCR);
	148
	149	return 0;
	150	}
	151
	152	/*
	153	* SSI system clock configuration.
	154	* Should only be called when port is inactive (i.e. SSIEN = 0).
	155	*/
	156	static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
	157	int clk_id, unsigned int freq, int dir)
	158	{
48dbc419	159	struct imx_ssi *ssi = cpu_dai->private_data;
8380222e SH	160	u32 scr;
	161
	162	scr = readl(ssi->base + SSI_SCR);
	163
	164	switch (clk_id) {
	165	case IMX_SSP_SYS_CLK:
	166	if (dir == SND_SOC_CLOCK_OUT)
	167	scr \|= SSI_SCR_SYS_CLK_EN;
	168	else
	169	scr &= ~SSI_SCR_SYS_CLK_EN;
	170	break;
	171	default:
	172	return -EINVAL;
	173	}
	174
	175	writel(scr, ssi->base + SSI_SCR);
	176
	177	return 0;
	178	}
	179
	180	/*
	181	* SSI Clock dividers
	182	* Should only be called when port is inactive (i.e. SSIEN = 0).
	183	*/
	184	static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
	185	int div_id, int div)
	186	{
48dbc419	187	struct imx_ssi *ssi = cpu_dai->private_data;
8380222e SH	188	u32 stccr, srccr;
	189
	190	stccr = readl(ssi->base + SSI_STCCR);
	191	srccr = readl(ssi->base + SSI_SRCCR);
	192
	193	switch (div_id) {
	194	case IMX_SSI_TX_DIV_2:
	195	stccr &= ~SSI_STCCR_DIV2;
	196	stccr \|= div;
	197	break;
	198	case IMX_SSI_TX_DIV_PSR:
	199	stccr &= ~SSI_STCCR_PSR;
	200	stccr \|= div;
	201	break;
	202	case IMX_SSI_TX_DIV_PM:
	203	stccr &= ~0xff;
	204	stccr \|= SSI_STCCR_PM(div);
	205	break;
	206	case IMX_SSI_RX_DIV_2:
	207	stccr &= ~SSI_STCCR_DIV2;
	208	stccr \|= div;
	209	break;
	210	case IMX_SSI_RX_DIV_PSR:
	211	stccr &= ~SSI_STCCR_PSR;
	212	stccr \|= div;
	213	break;
	214	case IMX_SSI_RX_DIV_PM:
	215	stccr &= ~0xff;
	216	stccr \|= SSI_STCCR_PM(div);
	217	break;
	218	default:
	219	return -EINVAL;
	220	}
	221
	222	writel(stccr, ssi->base + SSI_STCCR);
	223	writel(srccr, ssi->base + SSI_SRCCR);
	224
	225	return 0;
	226	}
	227
	228	/*
	229	* Should only be called when port is inactive (i.e. SSIEN = 0),
	230	* although can be called multiple times by upper layers.
	231	*/
	232	static int imx_ssi_hw_params(struct snd_pcm_substream *substream,
	233	struct snd_pcm_hw_params *params,
	234	struct snd_soc_dai *cpu_dai)
	235	{
48dbc419	236	struct imx_ssi *ssi = cpu_dai->private_data;
5f712b2b	237	struct imx_pcm_dma_params *dma_data;
8380222e SH	238	u32 reg, sccr;
	239
	240	/* Tx/Rx config */
	241	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	242	reg = SSI_STCCR;
5f712b2b	243	dma_data = &ssi->dma_params_tx;
8380222e SH	244	} else {
8380222e SH	245	reg = SSI_SRCCR;
5f712b2b	246	dma_data = &ssi->dma_params_rx;
8380222e SH	247	}
8380222e SH	248
5f712b2b DM	249	snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
5f712b2b DM	250
8380222e SH	251	sccr = readl(ssi->base + reg) & ~SSI_STCCR_WL_MASK;
	252
	253	/* DAI data (word) size */
	254	switch (params_format(params)) {
	255	case SNDRV_PCM_FORMAT_S16_LE:
	256	sccr \|= SSI_SRCCR_WL(16);
	257	break;
	258	case SNDRV_PCM_FORMAT_S20_3LE:
	259	sccr \|= SSI_SRCCR_WL(20);
	260	break;
	261	case SNDRV_PCM_FORMAT_S24_LE:
	262	sccr \|= SSI_SRCCR_WL(24);
	263	break;
	264	}
	265
	266	writel(sccr, ssi->base + reg);
	267
	268	return 0;
	269	}
	270
	271	static int imx_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
	272	struct snd_soc_dai *dai)
	273	{
	274	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	275	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
48dbc419	276	struct imx_ssi *ssi = cpu_dai->private_data;
8380222e SH	277	unsigned int sier_bits, sier;
	278	unsigned int scr;
	279
	280	scr = readl(ssi->base + SSI_SCR);
	281	sier = readl(ssi->base + SSI_SIER);
	282
	283	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	284	if (ssi->flags & IMX_SSI_DMA)
	285	sier_bits = SSI_SIER_TDMAE;
	286	else
	287	sier_bits = SSI_SIER_TIE \| SSI_SIER_TFE0_EN;
	288	} else {
	289	if (ssi->flags & IMX_SSI_DMA)
	290	sier_bits = SSI_SIER_RDMAE;
	291	else
	292	sier_bits = SSI_SIER_RIE \| SSI_SIER_RFF0_EN;
	293	}
	294
	295	switch (cmd) {
	296	case SNDRV_PCM_TRIGGER_START:
	297	case SNDRV_PCM_TRIGGER_RESUME:
	298	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	299	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	300	scr \|= SSI_SCR_TE;
	301	else
	302	scr \|= SSI_SCR_RE;
	303	sier \|= sier_bits;
	304
	305	if (++ssi->enabled == 1)
	306	scr \|= SSI_SCR_SSIEN;
	307
	308	break;
	309
	310	case SNDRV_PCM_TRIGGER_STOP:
	311	case SNDRV_PCM_TRIGGER_SUSPEND:
	312	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	313	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	314	scr &= ~SSI_SCR_TE;
	315	else
	316	scr &= ~SSI_SCR_RE;
	317	sier &= ~sier_bits;
	318
	319	if (--ssi->enabled == 0)
	320	scr &= ~SSI_SCR_SSIEN;
	321
	322	break;
	323	default:
	324	return -EINVAL;
	325	}
	326
	327	if (!(ssi->flags & IMX_SSI_USE_AC97))
	328	/* rx/tx are always enabled to access ac97 registers */
	329	writel(scr, ssi->base + SSI_SCR);
	330
	331	writel(sier, ssi->base + SSI_SIER);
	332
	333	return 0;
	334	}
	335
	336	static struct snd_soc_dai_ops imx_ssi_pcm_dai_ops = {
	337	.hw_params = imx_ssi_hw_params,
	338	.set_fmt = imx_ssi_set_dai_fmt,
	339	.set_clkdiv = imx_ssi_set_dai_clkdiv,
	340	.set_sysclk = imx_ssi_set_dai_sysclk,
341	.set_tdm_slot = imx_ssi_set_dai_tdm_slot,
342	.trigger = imx_ssi_trigger,
343	};
344
345	static struct snd_soc_dai imx_ssi_dai = {
346	.playback = {
347	.channels_min = 2,
348	.channels_max = 2,
349	.rates = SNDRV_PCM_RATE_8000_96000,
350	.formats = SNDRV_PCM_FMTBIT_S16_LE,
351	},
352	.capture = {
353	.channels_min = 2,
354	.channels_max = 2,
355	.rates = SNDRV_PCM_RATE_8000_96000,
356	.formats = SNDRV_PCM_FMTBIT_S16_LE,
357	},
358	.ops = &imx_ssi_pcm_dai_ops,
359	};
360
361	int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
362	struct vm_area_struct *vma)
363	{
364	struct snd_pcm_runtime *runtime = substream->runtime;
365	int ret;
366
367	ret = dma_mmap_coherent(NULL, vma, runtime->dma_area,
368	runtime->dma_addr, runtime->dma_bytes);
369
370	pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
371	runtime->dma_area,
372	runtime->dma_addr,
373	runtime->dma_bytes);
374	return ret;
375	}
376
377	static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
378	{
379	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
380	struct snd_dma_buffer *buf = &substream->dma_buffer;
381	size_t size = IMX_SSI_DMABUF_SIZE;
382
383	buf->dev.type = SNDRV_DMA_TYPE_DEV;
384	buf->dev.dev = pcm->card->dev;
385	buf->private_data = NULL;
386	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
387	&buf->addr, GFP_KERNEL);
388	if (!buf->area)
389	return -ENOMEM;
390	buf->bytes = size;
391
392	return 0;
393	}
394
395	static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
396
397	int imx_pcm_new(struct snd_card card, struct snd_soc_dai dai,
398	struct snd_pcm *pcm)
399	{
400
401	int ret = 0;
402
403	if (!card->dev->dma_mask)
404	card->dev->dma_mask = &imx_pcm_dmamask;
405	if (!card->dev->coherent_dma_mask)
406	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
407	if (dai->playback.channels_min) {
408	ret = imx_pcm_preallocate_dma_buffer(pcm,
409	SNDRV_PCM_STREAM_PLAYBACK);
410	if (ret)
411	goto out;
412	}
413
414	if (dai->capture.channels_min) {
415	ret = imx_pcm_preallocate_dma_buffer(pcm,
416	SNDRV_PCM_STREAM_CAPTURE);
417	if (ret)
418	goto out;
419	}
420
421	out:
422	return ret;
423	}
424
425	void imx_pcm_free(struct snd_pcm *pcm)
426	{
427	struct snd_pcm_substream *substream;
428	struct snd_dma_buffer *buf;
429	int stream;
430
431	for (stream = 0; stream < 2; stream++) {
432	substream = pcm->streams[stream].substream;
433	if (!substream)
434	continue;
435
436	buf = &substream->dma_buffer;
437	if (!buf->area)
438	continue;
439
440	dma_free_writecombine(pcm->card->dev, buf->bytes,
441	buf->area, buf->addr);
442	buf->area = NULL;
443	}
444	}
445
446	struct snd_soc_platform imx_soc_platform = {
447	.name = "imx-audio",
448	};
449	EXPORT_SYMBOL_GPL(imx_soc_platform);
450
451	static struct snd_soc_dai imx_ac97_dai = {
452	.name = "AC97",
453	.ac97_control = 1,
454	.playback = {
455	.stream_name = "AC97 Playback",
456	.channels_min = 2,
457	.channels_max = 2,
458	.rates = SNDRV_PCM_RATE_48000,
459	.formats = SNDRV_PCM_FMTBIT_S16_LE,
460	},
461	.capture = {
462	.stream_name = "AC97 Capture",
463	.channels_min = 2,
464	.channels_max = 2,
465	.rates = SNDRV_PCM_RATE_48000,
466	.formats = SNDRV_PCM_FMTBIT_S16_LE,
467	},
468	.ops = &imx_ssi_pcm_dai_ops,
469	};
470
471	static void setup_channel_to_ac97(struct imx_ssi *imx_ssi)
472	{
473	void __iomem *base = imx_ssi->base;
474
475	writel(0x0, base + SSI_SCR);
476	writel(0x0, base + SSI_STCR);
477	writel(0x0, base + SSI_SRCR);
478
479	writel(SSI_SCR_SYN \| SSI_SCR_NET, base + SSI_SCR);
480
481	writel(SSI_SFCSR_RFWM0(8) \|
482	SSI_SFCSR_TFWM0(8) \|
483	SSI_SFCSR_RFWM1(8) \|
484	SSI_SFCSR_TFWM1(8), base + SSI_SFCSR);
485
486	writel(SSI_STCCR_WL(16) \| SSI_STCCR_DC(12), base + SSI_STCCR);
487	writel(SSI_STCCR_WL(16) \| SSI_STCCR_DC(12), base + SSI_SRCCR);
488
489	writel(SSI_SCR_SYN \| SSI_SCR_NET \| SSI_SCR_SSIEN, base + SSI_SCR);
490	writel(SSI_SOR_WAIT(3), base + SSI_SOR);
491
492	writel(SSI_SCR_SYN \| SSI_SCR_NET \| SSI_SCR_SSIEN \|
493	SSI_SCR_TE \| SSI_SCR_RE,
494	base + SSI_SCR);
495
496	writel(SSI_SACNT_DEFAULT, base + SSI_SACNT);
497	writel(0xff, base + SSI_SACCDIS);
498	writel(0x300, base + SSI_SACCEN);
499	}
500
501	static struct imx_ssi *ac97_ssi;
502
503	static void imx_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
504	unsigned short val)
505	{
506	struct imx_ssi *imx_ssi = ac97_ssi;
507	void __iomem *base = imx_ssi->base;
508	unsigned int lreg;
509	unsigned int lval;
510
511	if (reg > 0x7f)
512	return;
513
514	pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
515
516	lreg = reg << 12;
517	writel(lreg, base + SSI_SACADD);
518
519	lval = val << 4;
520	writel(lval , base + SSI_SACDAT);
521
522	writel(SSI_SACNT_DEFAULT \| SSI_SACNT_WR, base + SSI_SACNT);
523	udelay(100);
524	}
525
526	static unsigned short imx_ssi_ac97_read(struct snd_ac97 *ac97,
527	unsigned short reg)
528	{
529	struct imx_ssi *imx_ssi = ac97_ssi;
530	void __iomem *base = imx_ssi->base;
531
532	unsigned short val = -1;
533	unsigned int lreg;
534
535	lreg = (reg & 0x7f) << 12 ;
536	writel(lreg, base + SSI_SACADD);
537	writel(SSI_SACNT_DEFAULT \| SSI_SACNT_RD, base + SSI_SACNT);
538
539	udelay(100);
540
541	val = (readl(base + SSI_SACDAT) >> 4) & 0xffff;
542
543	pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
544
545	return val;
546	}
547
548	static void imx_ssi_ac97_reset(struct snd_ac97 *ac97)
549	{
550	struct imx_ssi *imx_ssi = ac97_ssi;
551
552	if (imx_ssi->ac97_reset)
553	imx_ssi->ac97_reset(ac97);
554	}
555
556	static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97)
557	{
558	struct imx_ssi *imx_ssi = ac97_ssi;
559
560	if (imx_ssi->ac97_warm_reset)
561	imx_ssi->ac97_warm_reset(ac97);
562	}
563
564	struct snd_ac97_bus_ops soc_ac97_ops = {
565	.read = imx_ssi_ac97_read,
566	.write = imx_ssi_ac97_write,
567	.reset = imx_ssi_ac97_reset,
568	.warm_reset = imx_ssi_ac97_warm_reset
569	};
570	EXPORT_SYMBOL_GPL(soc_ac97_ops);
571
48dbc419	572	struct snd_soc_dai imx_ssi_pcm_dai[2];
8380222e SH	573	EXPORT_SYMBOL_GPL(imx_ssi_pcm_dai);
	574
	575	static int imx_ssi_probe(struct platform_device *pdev)
	576	{
	577	struct resource *res;
	578	struct imx_ssi *ssi;
	579	struct imx_ssi_platform_data *pdata = pdev->dev.platform_data;
	580	struct snd_soc_platform *platform;
	581	int ret = 0;
	582	unsigned int val;
48dbc419 MB	583	struct snd_soc_dai *dai = &imx_ssi_pcm_dai[pdev->id];
	584
	585	if (dai->id >= ARRAY_SIZE(imx_ssi_pcm_dai))
	586	return -EINVAL;
8380222e SH	587
	588	ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
	589	if (!ssi)
	590	return -ENOMEM;
	591
	592	if (pdata) {
	593	ssi->ac97_reset = pdata->ac97_reset;
	594	ssi->ac97_warm_reset = pdata->ac97_warm_reset;
	595	ssi->flags = pdata->flags;
	596	}
	597
8380222e SH	598	ssi->irq = platform_get_irq(pdev, 0);
	599
	600	ssi->clk = clk_get(&pdev->dev, NULL);
	601	if (IS_ERR(ssi->clk)) {
	602	ret = PTR_ERR(ssi->clk);
	603	dev_err(&pdev->dev, "Cannot get the clock: %d\n",
	604	ret);
	605	goto failed_clk;
	606	}
	607	clk_enable(ssi->clk);
	608
	609	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	610	if (!res) {
	611	ret = -ENODEV;
	612	goto failed_get_resource;
	613	}
	614
	615	if (!request_mem_region(res->start, resource_size(res), DRV_NAME)) {
	616	dev_err(&pdev->dev, "request_mem_region failed\n");
	617	ret = -EBUSY;
	618	goto failed_get_resource;
	619	}
	620
	621	ssi->base = ioremap(res->start, resource_size(res));
	622	if (!ssi->base) {
	623	dev_err(&pdev->dev, "ioremap failed\n");
	624	ret = -ENODEV;
	625	goto failed_ioremap;
	626	}
	627
	628	if (ssi->flags & IMX_SSI_USE_AC97) {
	629	if (ac97_ssi) {
	630	ret = -EBUSY;
	631	goto failed_ac97;
	632	}
	633	ac97_ssi = ssi;
	634	setup_channel_to_ac97(ssi);
48dbc419	635	memcpy(dai, &imx_ac97_dai, sizeof(imx_ac97_dai));
8380222e	636	} else
48dbc419	637	memcpy(dai, &imx_ssi_dai, sizeof(imx_ssi_dai));
8380222e SH	638
	639	writel(0x0, ssi->base + SSI_SIER);
	640
	641	ssi->dma_params_rx.dma_addr = res->start + SSI_SRX0;
	642	ssi->dma_params_tx.dma_addr = res->start + SSI_STX0;
	643
	644	res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx0");
	645	if (res)
	646	ssi->dma_params_tx.dma = res->start;
	647
	648	res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx0");
	649	if (res)
	650	ssi->dma_params_rx.dma = res->start;
	651
48dbc419 MB	652	dai->id = pdev->id;
	653	dai->dev = &pdev->dev;
	654	dai->name = kasprintf(GFP_KERNEL, "imx-ssi.%d", pdev->id);
	655	dai->private_data = ssi;
8380222e SH	656
	657	if ((cpu_is_mx27() \|\| cpu_is_mx21()) &&
	658	!(ssi->flags & IMX_SSI_USE_AC97)) {
	659	ssi->flags \|= IMX_SSI_DMA;
	660	platform = imx_ssi_dma_mx2_init(pdev, ssi);
	661	} else
	662	platform = imx_ssi_fiq_init(pdev, ssi);
	663
	664	imx_soc_platform.pcm_ops = platform->pcm_ops;
	665	imx_soc_platform.pcm_new = platform->pcm_new;
	666	imx_soc_platform.pcm_free = platform->pcm_free;
	667
	668	val = SSI_SFCSR_TFWM0(ssi->dma_params_tx.burstsize) \|
	669	SSI_SFCSR_RFWM0(ssi->dma_params_rx.burstsize);
	670	writel(val, ssi->base + SSI_SFCSR);
	671
48dbc419	672	ret = snd_soc_register_dai(dai);
8380222e SH	673	if (ret) {
	674	dev_err(&pdev->dev, "register DAI failed\n");
	675	goto failed_register;
	676	}
	677
	678	platform_set_drvdata(pdev, ssi);
	679
	680	return 0;
	681
	682	failed_register:
	683	failed_ac97:
	684	iounmap(ssi->base);
	685	failed_ioremap:
	686	release_mem_region(res->start, resource_size(res));
	687	failed_get_resource:
	688	clk_disable(ssi->clk);
	689	clk_put(ssi->clk);
	690	failed_clk:
	691	kfree(ssi);
	692
	693	return ret;
	694	}
	695
	696	static int __devexit imx_ssi_remove(struct platform_device *pdev)
	697	{
	698	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	699	struct imx_ssi *ssi = platform_get_drvdata(pdev);
48dbc419	700	struct snd_soc_dai *dai = &imx_ssi_pcm_dai[pdev->id];
8380222e	701
48dbc419	702	snd_soc_unregister_dai(dai);
8380222e SH	703
	704	if (ssi->flags & IMX_SSI_USE_AC97)
	705	ac97_ssi = NULL;
	706
	707	if (!(ssi->flags & IMX_SSI_DMA))
	708	imx_ssi_fiq_exit(pdev, ssi);
	709
	710	iounmap(ssi->base);
	711	release_mem_region(res->start, resource_size(res));
	712	clk_disable(ssi->clk);
	713	clk_put(ssi->clk);
	714	kfree(ssi);
	715
	716	return 0;
	717	}
	718
	719	static struct platform_driver imx_ssi_driver = {
	720	.probe = imx_ssi_probe,
	721	.remove = __devexit_p(imx_ssi_remove),
	722
	723	.driver = {
	724	.name = DRV_NAME,
	725	.owner = THIS_MODULE,
	726	},
	727	};
	728
	729	static int __init imx_ssi_init(void)
	730	{
	731	int ret;
	732
	733	ret = snd_soc_register_platform(&imx_soc_platform);
	734	if (ret) {
	735	pr_err("failed to register soc platform: %d\n", ret);
	736	return ret;
	737	}
	738
	739	ret = platform_driver_register(&imx_ssi_driver);
	740	if (ret) {
	741	snd_soc_unregister_platform(&imx_soc_platform);
	742	return ret;
	743	}
	744
	745	return 0;
	746	}
	747
	748	static void __exit imx_ssi_exit(void)
	749	{
	750	platform_driver_unregister(&imx_ssi_driver);
	751	snd_soc_unregister_platform(&imx_soc_platform);
	752	}
	753
	754	module_init(imx_ssi_init);
	755	module_exit(imx_ssi_exit);
	756
	757	/* Module information */
	758	MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>");
	759	MODULE_DESCRIPTION("i.MX I2S/ac97 SoC Interface");
	760	MODULE_LICENSE("GPL");
	761