Initial import

1 files changed, 841 insertions, 0 deletions

diff --git a/sound/soc/pxa/pxa-ssp.c b/sound/soc/pxa/pxa-ssp.c
new file mode 100644
index 000000000..fbe2e93d6
--- /dev/null
+++ b/sound/soc/pxa/pxa-ssp.c
@@ -0,0 +1,841 @@
+/*
+ * pxa-ssp.c  --  ALSA Soc Audio Layer
+ *
+ * Copyright 2005,2008 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ *         Mark Brown <broonie@opensource.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.
+ *
+ * TODO:
+ *  o Test network mode for > 16bit sample size
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/pxa2xx_ssp.h>
+#include <linux/of.h>
+#include <linux/dmaengine.h>
+
+#include <asm/irq.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/pxa2xx-lib.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "../../arm/pxa2xx-pcm.h"
+#include "pxa-ssp.h"
+
+/*
+ * SSP audio private data
+ */
+struct ssp_priv {
+	struct ssp_device *ssp;
+	unsigned int sysclk;
+	int dai_fmt;
+#ifdef CONFIG_PM
+	uint32_t	cr0;
+	uint32_t	cr1;
+	uint32_t	to;
+	uint32_t	psp;
+#endif
+};
+
+static void dump_registers(struct ssp_device *ssp)
+{
+	dev_dbg(&ssp->pdev->dev, "SSCR0 0x%08x SSCR1 0x%08x SSTO 0x%08x\n",
+		 pxa_ssp_read_reg(ssp, SSCR0), pxa_ssp_read_reg(ssp, SSCR1),
+		 pxa_ssp_read_reg(ssp, SSTO));
+
+	dev_dbg(&ssp->pdev->dev, "SSPSP 0x%08x SSSR 0x%08x SSACD 0x%08x\n",
+		 pxa_ssp_read_reg(ssp, SSPSP), pxa_ssp_read_reg(ssp, SSSR),
+		 pxa_ssp_read_reg(ssp, SSACD));
+}
+
+static void pxa_ssp_enable(struct ssp_device *ssp)
+{
+	uint32_t sscr0;
+
+	sscr0 = __raw_readl(ssp->mmio_base + SSCR0) | SSCR0_SSE;
+	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
+}
+
+static void pxa_ssp_disable(struct ssp_device *ssp)
+{
+	uint32_t sscr0;
+
+	sscr0 = __raw_readl(ssp->mmio_base + SSCR0) & ~SSCR0_SSE;
+	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
+}
+
+static void pxa_ssp_set_dma_params(struct ssp_device *ssp, int width4,
+			int out, struct snd_dmaengine_dai_dma_data *dma)
+{
+	dma->addr_width = width4 ? DMA_SLAVE_BUSWIDTH_4_BYTES :
+				   DMA_SLAVE_BUSWIDTH_2_BYTES;
+	dma->maxburst = 16;
+	dma->addr = ssp->phys_base + SSDR;
+}
+
+static int pxa_ssp_startup(struct snd_pcm_substream *substream,
+			   struct snd_soc_dai *cpu_dai)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	struct snd_dmaengine_dai_dma_data *dma;
+	int ret = 0;
+
+	if (!cpu_dai->active) {
+		clk_prepare_enable(ssp->clk);
+		pxa_ssp_disable(ssp);
+	}
+
+	dma = kzalloc(sizeof(struct snd_dmaengine_dai_dma_data), GFP_KERNEL);
+	if (!dma)
+		return -ENOMEM;
+
+	dma->filter_data = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
+				&ssp->drcmr_tx : &ssp->drcmr_rx;
+
+	snd_soc_dai_set_dma_data(cpu_dai, substream, dma);
+
+	return ret;
+}
+
+static void pxa_ssp_shutdown(struct snd_pcm_substream *substream,
+			     struct snd_soc_dai *cpu_dai)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+
+	if (!cpu_dai->active) {
+		pxa_ssp_disable(ssp);
+		clk_disable_unprepare(ssp->clk);
+	}
+
+	kfree(snd_soc_dai_get_dma_data(cpu_dai, substream));
+	snd_soc_dai_set_dma_data(cpu_dai, substream, NULL);
+}
+
+#ifdef CONFIG_PM
+
+static int pxa_ssp_suspend(struct snd_soc_dai *cpu_dai)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+
+	if (!cpu_dai->active)
+		clk_prepare_enable(ssp->clk);
+
+	priv->cr0 = __raw_readl(ssp->mmio_base + SSCR0);
+	priv->cr1 = __raw_readl(ssp->mmio_base + SSCR1);
+	priv->to  = __raw_readl(ssp->mmio_base + SSTO);
+	priv->psp = __raw_readl(ssp->mmio_base + SSPSP);
+
+	pxa_ssp_disable(ssp);
+	clk_disable_unprepare(ssp->clk);
+	return 0;
+}
+
+static int pxa_ssp_resume(struct snd_soc_dai *cpu_dai)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	uint32_t sssr = SSSR_ROR | SSSR_TUR | SSSR_BCE;
+
+	clk_prepare_enable(ssp->clk);
+
+	__raw_writel(sssr, ssp->mmio_base + SSSR);
+	__raw_writel(priv->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0);
+	__raw_writel(priv->cr1, ssp->mmio_base + SSCR1);
+	__raw_writel(priv->to,  ssp->mmio_base + SSTO);
+	__raw_writel(priv->psp, ssp->mmio_base + SSPSP);
+
+	if (cpu_dai->active)
+		pxa_ssp_enable(ssp);
+	else
+		clk_disable_unprepare(ssp->clk);
+
+	return 0;
+}
+
+#else
+#define pxa_ssp_suspend	NULL
+#define pxa_ssp_resume	NULL
+#endif
+
+/**
+ * ssp_set_clkdiv - set SSP clock divider
+ * @div: serial clock rate divider
+ */
+static void pxa_ssp_set_scr(struct ssp_device *ssp, u32 div)
+{
+	u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
+
+	if (ssp->type == PXA25x_SSP) {
+		sscr0 &= ~0x0000ff00;
+		sscr0 |= ((div - 2)/2) << 8; /* 2..512 */
+	} else {
+		sscr0 &= ~0x000fff00;
+		sscr0 |= (div - 1) << 8;     /* 1..4096 */
+	}
+	pxa_ssp_write_reg(ssp, SSCR0, sscr0);
+}
+
+/**
+ * pxa_ssp_get_clkdiv - get SSP clock divider
+ */
+static u32 pxa_ssp_get_scr(struct ssp_device *ssp)
+{
+	u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
+	u32 div;
+
+	if (ssp->type == PXA25x_SSP)
+		div = ((sscr0 >> 8) & 0xff) * 2 + 2;
+	else
+		div = ((sscr0 >> 8) & 0xfff) + 1;
+	return div;
+}
+
+/*
+ * Set the SSP ports SYSCLK.
+ */
+static int pxa_ssp_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
+	int clk_id, unsigned int freq, int dir)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	int val;
+
+	u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) &
+		~(SSCR0_ECS |  SSCR0_NCS | SSCR0_MOD | SSCR0_ACS);
+
+	dev_dbg(&ssp->pdev->dev,
+		"pxa_ssp_set_dai_sysclk id: %d, clk_id %d, freq %u\n",
+		cpu_dai->id, clk_id, freq);
+
+	switch (clk_id) {
+	case PXA_SSP_CLK_NET_PLL:
+		sscr0 |= SSCR0_MOD;
+		break;
+	case PXA_SSP_CLK_PLL:
+		/* Internal PLL is fixed */
+		if (ssp->type == PXA25x_SSP)
+			priv->sysclk = 1843200;
+		else
+			priv->sysclk = 13000000;
+		break;
+	case PXA_SSP_CLK_EXT:
+		priv->sysclk = freq;
+		sscr0 |= SSCR0_ECS;
+		break;
+	case PXA_SSP_CLK_NET:
+		priv->sysclk = freq;
+		sscr0 |= SSCR0_NCS | SSCR0_MOD;
+		break;
+	case PXA_SSP_CLK_AUDIO:
+		priv->sysclk = 0;
+		pxa_ssp_set_scr(ssp, 1);
+		sscr0 |= SSCR0_ACS;
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	/* The SSP clock must be disabled when changing SSP clock mode
+	 * on PXA2xx.  On PXA3xx it must be enabled when doing so. */
+	if (ssp->type != PXA3xx_SSP)
+		clk_disable_unprepare(ssp->clk);
+	val = pxa_ssp_read_reg(ssp, SSCR0) | sscr0;
+	pxa_ssp_write_reg(ssp, SSCR0, val);
+	if (ssp->type != PXA3xx_SSP)
+		clk_prepare_enable(ssp->clk);
+
+	return 0;
+}
+
+/*
+ * Set the SSP clock dividers.
+ */
+static int pxa_ssp_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
+	int div_id, int div)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	int val;
+
+	switch (div_id) {
+	case PXA_SSP_AUDIO_DIV_ACDS:
+		val = (pxa_ssp_read_reg(ssp, SSACD) & ~0x7) | SSACD_ACDS(div);
+		pxa_ssp_write_reg(ssp, SSACD, val);
+		break;
+	case PXA_SSP_AUDIO_DIV_SCDB:
+		val = pxa_ssp_read_reg(ssp, SSACD);
+		val &= ~SSACD_SCDB;
+		if (ssp->type == PXA3xx_SSP)
+			val &= ~SSACD_SCDX8;
+		switch (div) {
+		case PXA_SSP_CLK_SCDB_1:
+			val |= SSACD_SCDB;
+			break;
+		case PXA_SSP_CLK_SCDB_4:
+			break;
+		case PXA_SSP_CLK_SCDB_8:
+			if (ssp->type == PXA3xx_SSP)
+				val |= SSACD_SCDX8;
+			else
+				return -EINVAL;
+			break;
+		default:
+			return -EINVAL;
+		}
+		pxa_ssp_write_reg(ssp, SSACD, val);
+		break;
+	case PXA_SSP_DIV_SCR:
+		pxa_ssp_set_scr(ssp, div);
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/*
+ * Configure the PLL frequency pxa27x and (afaik - pxa320 only)
+ */
+static int pxa_ssp_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
+	int source, unsigned int freq_in, unsigned int freq_out)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	u32 ssacd = pxa_ssp_read_reg(ssp, SSACD) & ~0x70;
+
+	if (ssp->type == PXA3xx_SSP)
+		pxa_ssp_write_reg(ssp, SSACDD, 0);
+
+	switch (freq_out) {
+	case 5622000:
+		break;
+	case 11345000:
+		ssacd |= (0x1 << 4);
+		break;
+	case 12235000:
+		ssacd |= (0x2 << 4);
+		break;
+	case 14857000:
+		ssacd |= (0x3 << 4);
+		break;
+	case 32842000:
+		ssacd |= (0x4 << 4);
+		break;
+	case 48000000:
+		ssacd |= (0x5 << 4);
+		break;
+	case 0:
+		/* Disable */
+		break;
+
+	default:
+		/* PXA3xx has a clock ditherer which can be used to generate
+		 * a wider range of frequencies - calculate a value for it.
+		 */
+		if (ssp->type == PXA3xx_SSP) {
+			u32 val;
+			u64 tmp = 19968;
+			tmp *= 1000000;
+			do_div(tmp, freq_out);
+			val = tmp;
+
+			val = (val << 16) | 64;
+			pxa_ssp_write_reg(ssp, SSACDD, val);
+
+			ssacd |= (0x6 << 4);
+
+			dev_dbg(&ssp->pdev->dev,
+				"Using SSACDD %x to supply %uHz\n",
+				val, freq_out);
+			break;
+		}
+
+		return -EINVAL;
+	}
+
+	pxa_ssp_write_reg(ssp, SSACD, ssacd);
+
+	return 0;
+}
+
+/*
+ * Set the active slots in TDM/Network mode
+ */
+static int pxa_ssp_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
+	unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	u32 sscr0;
+
+	sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
+	sscr0 &= ~(SSCR0_MOD | SSCR0_SlotsPerFrm(8) | SSCR0_EDSS | SSCR0_DSS);
+
+	/* set slot width */
+	if (slot_width > 16)
+		sscr0 |= SSCR0_EDSS | SSCR0_DataSize(slot_width - 16);
+	else
+		sscr0 |= SSCR0_DataSize(slot_width);
+
+	if (slots > 1) {
+		/* enable network mode */
+		sscr0 |= SSCR0_MOD;
+
+		/* set number of active slots */
+		sscr0 |= SSCR0_SlotsPerFrm(slots);
+
+		/* set active slot mask */
+		pxa_ssp_write_reg(ssp, SSTSA, tx_mask);
+		pxa_ssp_write_reg(ssp, SSRSA, rx_mask);
+	}
+	pxa_ssp_write_reg(ssp, SSCR0, sscr0);
+
+	return 0;
+}
+
+/*
+ * Tristate the SSP DAI lines
+ */
+static int pxa_ssp_set_dai_tristate(struct snd_soc_dai *cpu_dai,
+	int tristate)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	u32 sscr1;
+
+	sscr1 = pxa_ssp_read_reg(ssp, SSCR1);
+	if (tristate)
+		sscr1 &= ~SSCR1_TTE;
+	else
+		sscr1 |= SSCR1_TTE;
+	pxa_ssp_write_reg(ssp, SSCR1, sscr1);
+
+	return 0;
+}
+
+/*
+ * Set up the SSP DAI format.
+ * The SSP Port must be inactive before calling this function as the
+ * physical interface format is changed.
+ */
+static int pxa_ssp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
+		unsigned int fmt)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	u32 sscr0, sscr1, sspsp, scfr;
+
+	/* check if we need to change anything at all */
+	if (priv->dai_fmt == fmt)
+		return 0;
+
+	/* we can only change the settings if the port is not in use */
+	if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) {
+		dev_err(&ssp->pdev->dev,
+			"can't change hardware dai format: stream is in use");
+		return -EINVAL;
+	}
+
+	/* reset port settings */
+	sscr0 = pxa_ssp_read_reg(ssp, SSCR0) &
+		~(SSCR0_ECS |  SSCR0_NCS | SSCR0_MOD | SSCR0_ACS);
+	sscr1 = SSCR1_RxTresh(8) | SSCR1_TxTresh(7);
+	sspsp = 0;
+
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+		sscr1 |= SSCR1_SCLKDIR | SSCR1_SFRMDIR | SSCR1_SCFR;
+		break;
+	case SND_SOC_DAIFMT_CBM_CFS:
+		sscr1 |= SSCR1_SCLKDIR | SSCR1_SCFR;
+		break;
+	case SND_SOC_DAIFMT_CBS_CFS:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		sspsp |= SSPSP_SFRMP;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		sspsp |= SSPSP_SCMODE(2);
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		sspsp |= SSPSP_SCMODE(2) | SSPSP_SFRMP;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		sscr0 |= SSCR0_PSP;
+		sscr1 |= SSCR1_RWOT | SSCR1_TRAIL;
+		/* See hw_params() */
+		break;
+
+	case SND_SOC_DAIFMT_DSP_A:
+		sspsp |= SSPSP_FSRT;
+	case SND_SOC_DAIFMT_DSP_B:
+		sscr0 |= SSCR0_MOD | SSCR0_PSP;
+		sscr1 |= SSCR1_TRAIL | SSCR1_RWOT;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	pxa_ssp_write_reg(ssp, SSCR0, sscr0);
+	pxa_ssp_write_reg(ssp, SSCR1, sscr1);
+	pxa_ssp_write_reg(ssp, SSPSP, sspsp);
+
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+	case SND_SOC_DAIFMT_CBM_CFS:
+		scfr = pxa_ssp_read_reg(ssp, SSCR1) | SSCR1_SCFR;
+		pxa_ssp_write_reg(ssp, SSCR1, scfr);
+
+		while (pxa_ssp_read_reg(ssp, SSSR) & SSSR_BSY)
+			cpu_relax();
+		break;
+	}
+
+	dump_registers(ssp);
+
+	/* Since we are configuring the timings for the format by hand
+	 * we have to defer some things until hw_params() where we
+	 * know parameters like the sample size.
+	 */
+	priv->dai_fmt = fmt;
+
+	return 0;
+}
+
+/*
+ * Set the SSP audio DMA parameters and sample size.
+ * Can be called multiple times by oss emulation.
+ */
+static int pxa_ssp_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params,
+				struct snd_soc_dai *cpu_dai)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	int chn = params_channels(params);
+	u32 sscr0;
+	u32 sspsp;
+	int width = snd_pcm_format_physical_width(params_format(params));
+	int ttsa = pxa_ssp_read_reg(ssp, SSTSA) & 0xf;
+	struct snd_dmaengine_dai_dma_data *dma_data;
+
+	dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream);
+
+	/* Network mode with one active slot (ttsa == 1) can be used
+	 * to force 16-bit frame width on the wire (for S16_LE), even
+	 * with two channels. Use 16-bit DMA transfers for this case.
+	 */
+	pxa_ssp_set_dma_params(ssp,
+		((chn == 2) && (ttsa != 1)) || (width == 32),
+		substream->stream == SNDRV_PCM_STREAM_PLAYBACK, dma_data);
+
+	/* we can only change the settings if the port is not in use */
+	if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE)
+		return 0;
+
+	/* clear selected SSP bits */
+	sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & ~(SSCR0_DSS | SSCR0_EDSS);
+
+	/* bit size */
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		if (ssp->type == PXA3xx_SSP)
+			sscr0 |= SSCR0_FPCKE;
+		sscr0 |= SSCR0_DataSize(16);
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(8));
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(16));
+		break;
+	}
+	pxa_ssp_write_reg(ssp, SSCR0, sscr0);
+
+	switch (priv->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+	       sspsp = pxa_ssp_read_reg(ssp, SSPSP);
+
+		if ((pxa_ssp_get_scr(ssp) == 4) && (width == 16)) {
+			/* This is a special case where the bitclk is 64fs
+			* and we're not dealing with 2*32 bits of audio
+			* samples.
+			*
+			* The SSP values used for that are all found out by
+			* trying and failing a lot; some of the registers
+			* needed for that mode are only available on PXA3xx.
+			*/
+			if (ssp->type != PXA3xx_SSP)
+				return -EINVAL;
+
+			sspsp |= SSPSP_SFRMWDTH(width * 2);
+			sspsp |= SSPSP_SFRMDLY(width * 4);
+			sspsp |= SSPSP_EDMYSTOP(3);
+			sspsp |= SSPSP_DMYSTOP(3);
+			sspsp |= SSPSP_DMYSTRT(1);
+		} else {
+			/* The frame width is the width the LRCLK is
+			 * asserted for; the delay is expressed in
+			 * half cycle units.  We need the extra cycle
+			 * because the data starts clocking out one BCLK
+			 * after LRCLK changes polarity.
+			 */
+			sspsp |= SSPSP_SFRMWDTH(width + 1);
+			sspsp |= SSPSP_SFRMDLY((width + 1) * 2);
+			sspsp |= SSPSP_DMYSTRT(1);
+		}
+
+		pxa_ssp_write_reg(ssp, SSPSP, sspsp);
+		break;
+	default:
+		break;
+	}
+
+	/* When we use a network mode, we always require TDM slots
+	 * - complain loudly and fail if they've not been set up yet.
+	 */
+	if ((sscr0 & SSCR0_MOD) && !ttsa) {
+		dev_err(&ssp->pdev->dev, "No TDM timeslot configured\n");
+		return -EINVAL;
+	}
+
+	dump_registers(ssp);
+
+	return 0;
+}
+
+static void pxa_ssp_set_running_bit(struct snd_pcm_substream *substream,
+				    struct ssp_device *ssp, int value)
+{
+	uint32_t sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
+	uint32_t sscr1 = pxa_ssp_read_reg(ssp, SSCR1);
+	uint32_t sspsp = pxa_ssp_read_reg(ssp, SSPSP);
+	uint32_t sssr = pxa_ssp_read_reg(ssp, SSSR);
+
+	if (value && (sscr0 & SSCR0_SSE))
+		pxa_ssp_write_reg(ssp, SSCR0, sscr0 & ~SSCR0_SSE);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		if (value)
+			sscr1 |= SSCR1_TSRE;
+		else
+			sscr1 &= ~SSCR1_TSRE;
+	} else {
+		if (value)
+			sscr1 |= SSCR1_RSRE;
+		else
+			sscr1 &= ~SSCR1_RSRE;
+	}
+
+	pxa_ssp_write_reg(ssp, SSCR1, sscr1);
+
+	if (value) {
+		pxa_ssp_write_reg(ssp, SSSR, sssr);
+		pxa_ssp_write_reg(ssp, SSPSP, sspsp);
+		pxa_ssp_write_reg(ssp, SSCR0, sscr0 | SSCR0_SSE);
+	}
+}
+
+static int pxa_ssp_trigger(struct snd_pcm_substream *substream, int cmd,
+			   struct snd_soc_dai *cpu_dai)
+{
+	int ret = 0;
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+	struct ssp_device *ssp = priv->ssp;
+	int val;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_RESUME:
+		pxa_ssp_enable(ssp);
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		pxa_ssp_set_running_bit(substream, ssp, 1);
+		val = pxa_ssp_read_reg(ssp, SSSR);
+		pxa_ssp_write_reg(ssp, SSSR, val);
+		break;
+	case SNDRV_PCM_TRIGGER_START:
+		pxa_ssp_set_running_bit(substream, ssp, 1);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		pxa_ssp_set_running_bit(substream, ssp, 0);
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		pxa_ssp_disable(ssp);
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		pxa_ssp_set_running_bit(substream, ssp, 0);
+		break;
+
+	default:
+		ret = -EINVAL;
+	}
+
+	dump_registers(ssp);
+
+	return ret;
+}
+
+static int pxa_ssp_probe(struct snd_soc_dai *dai)
+{
+	struct device *dev = dai->dev;
+	struct ssp_priv *priv;
+	int ret;
+
+	priv = kzalloc(sizeof(struct ssp_priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	if (dev->of_node) {
+		struct device_node *ssp_handle;
+
+		ssp_handle = of_parse_phandle(dev->of_node, "port", 0);
+		if (!ssp_handle) {
+			dev_err(dev, "unable to get 'port' phandle\n");
+			ret = -ENODEV;
+			goto err_priv;
+		}
+
+		priv->ssp = pxa_ssp_request_of(ssp_handle, "SoC audio");
+		if (priv->ssp == NULL) {
+			ret = -ENODEV;
+			goto err_priv;
+		}
+	} else {
+		priv->ssp = pxa_ssp_request(dai->id + 1, "SoC audio");
+		if (priv->ssp == NULL) {
+			ret = -ENODEV;
+			goto err_priv;
+		}
+	}
+
+	priv->dai_fmt = (unsigned int) -1;
+	snd_soc_dai_set_drvdata(dai, priv);
+
+	return 0;
+
+err_priv:
+	kfree(priv);
+	return ret;
+}
+
+static int pxa_ssp_remove(struct snd_soc_dai *dai)
+{
+	struct ssp_priv *priv = snd_soc_dai_get_drvdata(dai);
+
+	pxa_ssp_free(priv->ssp);
+	kfree(priv);
+	return 0;
+}
+
+#define PXA_SSP_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_64000 |	\
+			  SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
+
+#define PXA_SSP_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+static const struct snd_soc_dai_ops pxa_ssp_dai_ops = {
+	.startup	= pxa_ssp_startup,
+	.shutdown	= pxa_ssp_shutdown,
+	.trigger	= pxa_ssp_trigger,
+	.hw_params	= pxa_ssp_hw_params,
+	.set_sysclk	= pxa_ssp_set_dai_sysclk,
+	.set_clkdiv	= pxa_ssp_set_dai_clkdiv,
+	.set_pll	= pxa_ssp_set_dai_pll,
+	.set_fmt	= pxa_ssp_set_dai_fmt,
+	.set_tdm_slot	= pxa_ssp_set_dai_tdm_slot,
+	.set_tristate	= pxa_ssp_set_dai_tristate,
+};
+
+static struct snd_soc_dai_driver pxa_ssp_dai = {
+		.probe = pxa_ssp_probe,
+		.remove = pxa_ssp_remove,
+		.suspend = pxa_ssp_suspend,
+		.resume = pxa_ssp_resume,
+		.playback = {
+			.channels_min = 1,
+			.channels_max = 8,
+			.rates = PXA_SSP_RATES,
+			.formats = PXA_SSP_FORMATS,
+		},
+		.capture = {
+			 .channels_min = 1,
+			 .channels_max = 8,
+			.rates = PXA_SSP_RATES,
+			.formats = PXA_SSP_FORMATS,
+		 },
+		.ops = &pxa_ssp_dai_ops,
+};
+
+static const struct snd_soc_component_driver pxa_ssp_component = {
+	.name		= "pxa-ssp",
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id pxa_ssp_of_ids[] = {
+	{ .compatible = "mrvl,pxa-ssp-dai" },
+	{}
+};
+#endif
+
+static int asoc_ssp_probe(struct platform_device *pdev)
+{
+	return snd_soc_register_component(&pdev->dev, &pxa_ssp_component,
+					  &pxa_ssp_dai, 1);
+}
+
+static int asoc_ssp_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_component(&pdev->dev);
+	return 0;
+}
+
+static struct platform_driver asoc_ssp_driver = {
+	.driver = {
+		.name = "pxa-ssp-dai",
+		.of_match_table = of_match_ptr(pxa_ssp_of_ids),
+	},
+
+	.probe = asoc_ssp_probe,
+	.remove = asoc_ssp_remove,
+};
+
+module_platform_driver(asoc_ssp_driver);
+
+/* Module information */
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("PXA SSP/PCM SoC Interface");
+MODULE_LICENSE("GPL");