ASoC: Add SuperH FSI driver support for ALSA

This driver is very simple.
It support playback only now.
This patch is tested by ms7724se board.

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 1012 insertions, 1 deletions

diff --git a/sound/soc/sh/Kconfig b/sound/soc/sh/Kconfig
index 54bd604012af..01943a188cff 100644
--- a/sound/soc/sh/Kconfig
+++ b/sound/soc/sh/Kconfig
@@ -20,7 +20,12 @@ config SND_SOC_SH4_HAC
 config SND_SOC_SH4_SSI
 	tristate
 
-
+config SND_SOC_SH4_FSI
+	tristate "SH4 FSI support"
+	depends on CPU_SUBTYPE_SH7724
+        select SH_DMA
+	help
+	  This option enables FSI sound support
 
 ##
 ## Boards
diff --git a/sound/soc/sh/Makefile b/sound/soc/sh/Makefile
index a8e8ab81cc6a..9fbcc4ac9420 100644
--- a/sound/soc/sh/Makefile
+++ b/sound/soc/sh/Makefile
@@ -5,8 +5,10 @@ obj-$(CONFIG_SND_SOC_PCM_SH7760)	+= snd-soc-dma-sh7760.o
 ## audio units found on some SH-4
 snd-soc-hac-objs	:= hac.o
 snd-soc-ssi-objs	:= ssi.o
+snd-soc-fsi-objs	:= fsi.o
 obj-$(CONFIG_SND_SOC_SH4_HAC)	+= snd-soc-hac.o
 obj-$(CONFIG_SND_SOC_SH4_SSI)	+= snd-soc-ssi.o
+obj-$(CONFIG_SND_SOC_SH4_FSI)	+= snd-soc-fsi.o
 
 ## boards
 snd-soc-sh7760-ac97-objs	:= sh7760-ac97.o
diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
new file mode 100644
index 000000000000..44123248b630
--- /dev/null
+++ b/sound/soc/sh/fsi.c
@@ -0,0 +1,1004 @@
+/*
+ * Fifo-attached Serial Interface (FSI) support for SH7724
+ *
+ * Copyright (C) 2009 Renesas Solutions Corp.
+ * Kuninori Morimoto <morimoto.kuninori@renesas.com>
+ *
+ * Based on ssi.c
+ * Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/list.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include <sound/sh_fsi.h>
+#include <asm/atomic.h>
+#include <asm/dma.h>
+#include <asm/dma-sh.h>
+
+#define DO_FMT		0x0000
+#define DOFF_CTL	0x0004
+#define DOFF_ST		0x0008
+#define DI_FMT		0x000C
+#define DIFF_CTL	0x0010
+#define DIFF_ST		0x0014
+#define CKG1		0x0018
+#define CKG2		0x001C
+#define DIDT		0x0020
+#define DODT		0x0024
+#define MUTE_ST		0x0028
+#define REG_END		MUTE_ST
+
+#define INT_ST		0x0200
+#define IEMSK		0x0204
+#define IMSK		0x0208
+#define MUTE		0x020C
+#define CLK_RST		0x0210
+#define SOFT_RST	0x0214
+#define MREG_START	INT_ST
+#define MREG_END	SOFT_RST
+
+/* DO_FMT */
+/* DI_FMT */
+#define CR_FMT(param) ((param) << 4)
+# define CR_MONO	0x0
+# define CR_MONO_D	0x1
+# define CR_PCM		0x2
+# define CR_I2S		0x3
+# define CR_TDM		0x4
+# define CR_TDM_D	0x5
+
+/* DOFF_CTL */
+/* DIFF_CTL */
+#define IRQ_HALF	0x00100000
+#define FIFO_CLR	0x00000001
+
+/* DOFF_ST */
+#define ERR_OVER	0x00000010
+#define ERR_UNDER	0x00000001
+
+/* CLK_RST */
+#define B_CLK		0x00000010
+#define A_CLK		0x00000001
+
+/* INT_ST */
+#define INT_B_IN	(1 << 12)
+#define INT_B_OUT	(1 << 8)
+#define INT_A_IN	(1 << 4)
+#define INT_A_OUT	(1 << 0)
+
+#define FSI_RATES SNDRV_PCM_RATE_8000_96000
+
+#define FSI_FMTS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE)
+
+/************************************************************************
+
+
+		struct
+
+
+************************************************************************/
+struct fsi_priv {
+	void __iomem *base;
+	struct snd_pcm_substream *substream;
+
+	int fifo_max;
+	int chan;
+	int dma_chan;
+
+	int byte_offset;
+	int period_len;
+	int buffer_len;
+	int periods;
+};
+
+struct fsi_master {
+	void __iomem *base;
+	int irq;
+	struct clk *clk;
+	struct fsi_priv fsia;
+	struct fsi_priv fsib;
+	struct sh_fsi_platform_info *info;
+};
+
+static struct fsi_master *master;
+
+/************************************************************************
+
+
+		basic read write function
+
+
+************************************************************************/
+static int __fsi_reg_write(u32 reg, u32 data)
+{
+	/* valid data area is 24bit */
+	data &= 0x00ffffff;
+
+	return ctrl_outl(data, reg);
+}
+
+static u32 __fsi_reg_read(u32 reg)
+{
+	return ctrl_inl(reg);
+}
+
+static int __fsi_reg_mask_set(u32 reg, u32 mask, u32 data)
+{
+	u32 val = __fsi_reg_read(reg);
+
+	val &= ~mask;
+	val |= data & mask;
+
+	return __fsi_reg_write(reg, val);
+}
+
+static int fsi_reg_write(struct fsi_priv *fsi, u32 reg, u32 data)
+{
+	if (reg > REG_END)
+		return -1;
+
+	return __fsi_reg_write((u32)(fsi->base + reg), data);
+}
+
+static u32 fsi_reg_read(struct fsi_priv *fsi, u32 reg)
+{
+	if (reg > REG_END)
+		return 0;
+
+	return __fsi_reg_read((u32)(fsi->base + reg));
+}
+
+static int fsi_reg_mask_set(struct fsi_priv *fsi, u32 reg, u32 mask, u32 data)
+{
+	if (reg > REG_END)
+		return -1;
+
+	return __fsi_reg_mask_set((u32)(fsi->base + reg), mask, data);
+}
+
+static int fsi_master_write(u32 reg, u32 data)
+{
+	if ((reg < MREG_START) ||
+	    (reg > MREG_END))
+		return -1;
+
+	return __fsi_reg_write((u32)(master->base + reg), data);
+}
+
+static u32 fsi_master_read(u32 reg)
+{
+	if ((reg < MREG_START) ||
+	    (reg > MREG_END))
+		return 0;
+
+	return __fsi_reg_read((u32)(master->base + reg));
+}
+
+static int fsi_master_mask_set(u32 reg, u32 mask, u32 data)
+{
+	if ((reg < MREG_START) ||
+	    (reg > MREG_END))
+		return -1;
+
+	return __fsi_reg_mask_set((u32)(master->base + reg), mask, data);
+}
+
+/************************************************************************
+
+
+		basic function
+
+
+************************************************************************/
+static struct fsi_priv *fsi_get(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd;
+	struct fsi_priv *fsi = NULL;
+
+	if (!substream || !master)
+		return NULL;
+
+	rtd = substream->private_data;
+	switch (rtd->dai->cpu_dai->id) {
+	case 0:
+		fsi = &master->fsia;
+		break;
+	case 1:
+		fsi = &master->fsib;
+		break;
+	}
+
+	return fsi;
+}
+
+static int fsi_is_port_a(struct fsi_priv *fsi)
+{
+	/* return
+	 * 1 : port a
+	 * 0 : port b
+	 */
+
+	if (fsi == &master->fsia)
+		return 1;
+
+	return 0;
+}
+
+static u32 fsi_get_info_flags(struct fsi_priv *fsi)
+{
+	int is_porta = fsi_is_port_a(fsi);
+
+	return is_porta ? master->info->porta_flags :
+		master->info->portb_flags;
+}
+
+static int fsi_is_master_mode(struct fsi_priv *fsi, int is_play)
+{
+	u32 mode;
+	u32 flags = fsi_get_info_flags(fsi);
+
+	mode = is_play ? SH_FSI_OUT_SLAVE_MODE : SH_FSI_IN_SLAVE_MODE;
+
+	/* return
+	 * 1 : master mode
+	 * 0 : slave mode
+	 */
+
+	return (mode & flags) != mode;
+}
+
+static u32 fsi_port_ab_io_bit(struct fsi_priv *fsi, int is_play)
+{
+	int is_porta = fsi_is_port_a(fsi);
+	u32 data;
+
+	if (is_porta)
+		data = is_play ? (1 << 0) : (1 << 4);
+	else
+		data = is_play ? (1 << 8) : (1 << 12);
+
+	return data;
+}
+
+static void fsi_stream_push(struct fsi_priv *fsi,
+			    struct snd_pcm_substream *substream,
+			    u32 buffer_len,
+			    u32 period_len)
+{
+	fsi->substream		= substream;
+	fsi->buffer_len		= buffer_len;
+	fsi->period_len		= period_len;
+	fsi->byte_offset	= 0;
+	fsi->periods		= 0;
+}
+
+static void fsi_stream_pop(struct fsi_priv *fsi)
+{
+	fsi->substream		= NULL;
+	fsi->buffer_len		= 0;
+	fsi->period_len		= 0;
+	fsi->byte_offset	= 0;
+	fsi->periods		= 0;
+}
+
+static int fsi_get_fifo_residue(struct fsi_priv *fsi, int is_play)
+{
+	u32 status;
+	u32 reg = is_play ? DOFF_ST : DIFF_ST;
+	int residue;
+
+	status = fsi_reg_read(fsi, reg);
+	residue = 0x1ff & (status >> 8);
+	residue *= fsi->chan;
+
+	return residue;
+}
+
+static int fsi_get_residue(struct fsi_priv *fsi, int is_play)
+{
+	int residue;
+	int width;
+	struct snd_pcm_runtime *runtime;
+
+	runtime = fsi->substream->runtime;
+
+	/* get 1 channel data width */
+	width = frames_to_bytes(runtime, 1) / fsi->chan;
+
+	if (2 == width)
+		residue = fsi_get_fifo_residue(fsi, is_play);
+	else
+		residue = get_dma_residue(fsi->dma_chan);
+
+	return residue;
+}
+
+/************************************************************************
+
+
+		basic dma function
+
+
+************************************************************************/
+#define PORTA_DMA 0
+#define PORTB_DMA 1
+
+static int fsi_get_dma_chan(void)
+{
+	if (0 != request_dma(PORTA_DMA, "fsia"))
+		return -EIO;
+
+	if (0 != request_dma(PORTB_DMA, "fsib")) {
+		free_dma(PORTA_DMA);
+		return -EIO;
+	}
+
+	master->fsia.dma_chan = PORTA_DMA;
+	master->fsib.dma_chan = PORTB_DMA;
+
+	return 0;
+}
+
+static void fsi_free_dma_chan(void)
+{
+	dma_wait_for_completion(PORTA_DMA);
+	dma_wait_for_completion(PORTB_DMA);
+	free_dma(PORTA_DMA);
+	free_dma(PORTB_DMA);
+
+	master->fsia.dma_chan = -1;
+	master->fsib.dma_chan = -1;
+}
+
+/************************************************************************
+
+
+		ctrl function
+
+
+************************************************************************/
+static void fsi_irq_enable(struct fsi_priv *fsi, int is_play)
+{
+	u32 data = fsi_port_ab_io_bit(fsi, is_play);
+
+	fsi_master_mask_set(IMSK,  data, data);
+	fsi_master_mask_set(IEMSK, data, data);
+}
+
+static void fsi_irq_disable(struct fsi_priv *fsi, int is_play)
+{
+	u32 data = fsi_port_ab_io_bit(fsi, is_play);
+
+	fsi_master_mask_set(IMSK,  data, 0);
+	fsi_master_mask_set(IEMSK, data, 0);
+}
+
+static void fsi_clk_ctrl(struct fsi_priv *fsi, int enable)
+{
+	u32 val = fsi_is_port_a(fsi) ? (1 << 0) : (1 << 4);
+
+	if (enable)
+		fsi_master_mask_set(CLK_RST, val, val);
+	else
+		fsi_master_mask_set(CLK_RST, val, 0);
+}
+
+static void fsi_irq_init(struct fsi_priv *fsi, int is_play)
+{
+	u32 data;
+	u32 ctrl;
+
+	data = fsi_port_ab_io_bit(fsi, is_play);
+	ctrl = is_play ? DOFF_CTL : DIFF_CTL;
+
+	/* set IMSK */
+	fsi_irq_disable(fsi, is_play);
+
+	/* set interrupt generation factor */
+	fsi_reg_write(fsi, ctrl, IRQ_HALF);
+
+	/* clear FIFO */
+	fsi_reg_mask_set(fsi, ctrl, FIFO_CLR, FIFO_CLR);
+
+	/* clear interrupt factor */
+	fsi_master_mask_set(INT_ST, data, 0);
+}
+
+static void fsi_soft_all_reset(void)
+{
+	u32 status = fsi_master_read(SOFT_RST);
+
+	/* port AB reset */
+	status &= 0x000000ff;
+	fsi_master_write(SOFT_RST, status);
+	mdelay(10);
+
+	/* soft reset */
+	status &= 0x000000f0;
+	fsi_master_write(SOFT_RST, status);
+	status |= 0x00000001;
+	fsi_master_write(SOFT_RST, status);
+	mdelay(10);
+}
+
+static void fsi_16data_push(struct fsi_priv *fsi,
+			   struct snd_pcm_runtime *runtime,
+			   int send)
+{
+	u16 *dma_start;
+	u32 snd;
+	int i;
+
+	/* get dma start position for FSI */
+	dma_start = (u16 *)runtime->dma_area;
+	dma_start += fsi->byte_offset / 2;
+
+	/*
+	 * soft dma
+	 * FSI can not use DMA when 16bpp
+	 */
+	for (i = 0; i < send; i++) {
+		snd = (u32)dma_start[i];
+		fsi_reg_write(fsi, DODT, snd << 8);
+	}
+}
+
+static void fsi_32data_push(struct fsi_priv *fsi,
+			   struct snd_pcm_runtime *runtime,
+			   int send)
+{
+	u32 *dma_start;
+
+	/* get dma start position for FSI */
+	dma_start = (u32 *)runtime->dma_area;
+	dma_start += fsi->byte_offset / 4;
+
+	dma_wait_for_completion(fsi->dma_chan);
+	dma_configure_channel(fsi->dma_chan, (SM_INC|0x400|TS_32|TM_BUR));
+	dma_write(fsi->dma_chan, (u32)dma_start,
+		  (u32)(fsi->base + DODT), send * 4);
+}
+
+/* playback interrupt */
+static int fsi_data_push(struct fsi_priv *fsi)
+{
+	struct snd_pcm_runtime *runtime;
+	struct snd_pcm_substream *substream = NULL;
+	int send;
+	int fifo_free;
+	int width;
+
+	if (!fsi			||
+	    !fsi->substream		||
+	    !fsi->substream->runtime)
+		return -EINVAL;
+
+	runtime = fsi->substream->runtime;
+
+	/* FSI FIFO has limit.
+	 * So, this driver can not send periods data at a time
+	 */
+	if (fsi->byte_offset >=
+	    fsi->period_len * (fsi->periods + 1)) {
+
+		substream = fsi->substream;
+		fsi->periods = (fsi->periods + 1) % runtime->periods;
+
+		if (0 == fsi->periods)
+			fsi->byte_offset = 0;
+	}
+
+	/* get 1 channel data width */
+	width = frames_to_bytes(runtime, 1) / fsi->chan;
+
+	/* get send size for alsa */
+	send = (fsi->buffer_len - fsi->byte_offset) / width;
+
+	/*  get FIFO free size */
+	fifo_free = (fsi->fifo_max * fsi->chan) - fsi_get_fifo_residue(fsi, 1);
+
+	/* size check */
+	if (fifo_free < send)
+		send = fifo_free;
+
+	if (2 == width)
+		fsi_16data_push(fsi, runtime, send);
+	else if (4 == width)
+		fsi_32data_push(fsi, runtime, send);
+	else
+		return -EINVAL;
+
+	fsi->byte_offset += send * width;
+
+	fsi_irq_enable(fsi, 1);
+
+	if (substream)
+		snd_pcm_period_elapsed(substream);
+
+	return 0;
+}
+
+static irqreturn_t fsi_interrupt(int irq, void *data)
+{
+	u32 status = fsi_master_read(SOFT_RST) & ~0x00000010;
+	u32 int_st = fsi_master_read(INT_ST);
+
+	/* clear irq status */
+	fsi_master_write(SOFT_RST, status);
+	fsi_master_write(SOFT_RST, status | 0x00000010);
+
+	if (int_st & INT_A_OUT)
+		fsi_data_push(&master->fsia);
+	if (int_st & INT_B_OUT)
+		fsi_data_push(&master->fsib);
+
+	fsi_master_write(INT_ST, 0x0000000);
+
+	return IRQ_HANDLED;
+}
+
+/************************************************************************
+
+
+		dai ops
+
+
+************************************************************************/
+static int fsi_dai_startup(struct snd_pcm_substream *substream,
+			   struct snd_soc_dai *dai)
+{
+	struct fsi_priv *fsi = fsi_get(substream);
+	const char *msg;
+	u32 flags = fsi_get_info_flags(fsi);
+	u32 fmt;
+	u32 reg;
+	u32 data;
+	int is_play = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
+	int is_master;
+	int ret = 0;
+
+	clk_enable(master->clk);
+
+	/* CKG1 */
+	data = is_play ? (1 << 0) : (1 << 4);
+	is_master = fsi_is_master_mode(fsi, is_play);
+	if (is_master)
+		fsi_reg_mask_set(fsi, CKG1, data, data);
+	else
+		fsi_reg_mask_set(fsi, CKG1, data, 0);
+
+	/* clock inversion (CKG2) */
+	data = 0;
+	switch (SH_FSI_INVERSION_MASK & flags) {
+	case SH_FSI_LRM_INV:
+		data = 1 << 12;
+		break;
+	case SH_FSI_BRM_INV:
+		data = 1 << 8;
+		break;
+	case SH_FSI_LRS_INV:
+		data = 1 << 4;
+		break;
+	case SH_FSI_BRS_INV:
+		data = 1 << 0;
+		break;
+	}
+	fsi_reg_write(fsi, CKG2, data);
+
+	/* do fmt, di fmt */
+	data = 0;
+	reg = is_play ? DO_FMT : DI_FMT;
+	fmt = is_play ? SH_FSI_GET_OFMT(flags) : SH_FSI_GET_IFMT(flags);
+	switch (fmt) {
+	case SH_FSI_FMT_MONO:
+		msg = "MONO";
+		data = CR_FMT(CR_MONO);
+		fsi->chan = 1;
+		break;
+	case SH_FSI_FMT_MONO_DELAY:
+		msg = "MONO Delay";
+		data = CR_FMT(CR_MONO_D);
+		fsi->chan = 1;
+		break;
+	case SH_FSI_FMT_PCM:
+		msg = "PCM";
+		data = CR_FMT(CR_PCM);
+		fsi->chan = 2;
+		break;
+	case SH_FSI_FMT_I2S:
+		msg = "I2S";
+		data = CR_FMT(CR_I2S);
+		fsi->chan = 2;
+		break;
+	case SH_FSI_FMT_TDM:
+		msg = "TDM";
+		data = CR_FMT(CR_TDM) | (fsi->chan - 1);
+		fsi->chan = is_play ?
+			SH_FSI_GET_CH_O(flags) : SH_FSI_GET_CH_I(flags);
+		break;
+	case SH_FSI_FMT_TDM_DELAY:
+		msg = "TDM Delay";
+		data = CR_FMT(CR_TDM_D) | (fsi->chan - 1);
+		fsi->chan = is_play ?
+			SH_FSI_GET_CH_O(flags) : SH_FSI_GET_CH_I(flags);
+		break;
+	default:
+		dev_err(dai->dev, "unknown format.\n");
+		return -EINVAL;
+	}
+
+	switch (fsi->chan) {
+	case 1:
+		fsi->fifo_max = 256;
+		break;
+	case 2:
+		fsi->fifo_max = 128;
+		break;
+	case 3:
+	case 4:
+		fsi->fifo_max = 64;
+		break;
+	case 5:
+	case 6:
+	case 7:
+	case 8:
+		fsi->fifo_max = 32;
+		break;
+	default:
+		dev_err(dai->dev, "channel size error.\n");
+		return -EINVAL;
+	}
+
+	fsi_reg_write(fsi, reg, data);
+	dev_dbg(dai->dev, "use %s format (%d channel) use %d DMAC\n",
+		msg, fsi->chan, fsi->dma_chan);
+
+	/*
+	 * clear clk reset if master mode
+	 */
+	if (is_master)
+		fsi_clk_ctrl(fsi, 1);
+
+	/* irq setting */
+	fsi_irq_init(fsi, is_play);
+
+	return ret;
+}
+
+static void fsi_dai_shutdown(struct snd_pcm_substream *substream,
+			     struct snd_soc_dai *dai)
+{
+	struct fsi_priv *fsi = fsi_get(substream);
+	int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+
+	fsi_irq_disable(fsi, is_play);
+	fsi_clk_ctrl(fsi, 0);
+
+	clk_disable(master->clk);
+}
+
+static int fsi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
+			   struct snd_soc_dai *dai)
+{
+	struct fsi_priv *fsi = fsi_get(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+	int ret = 0;
+
+	/* capture not supported */
+	if (!is_play)
+		return -ENODEV;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		fsi_stream_push(fsi, substream,
+				frames_to_bytes(runtime, runtime->buffer_size),
+				frames_to_bytes(runtime, runtime->period_size));
+		ret = fsi_data_push(fsi);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		fsi_irq_disable(fsi, is_play);
+		fsi_stream_pop(fsi);
+		break;
+	}
+
+	return ret;
+}
+
+static struct snd_soc_dai_ops fsi_dai_ops = {
+	.startup	= fsi_dai_startup,
+	.shutdown	= fsi_dai_shutdown,
+	.trigger	= fsi_dai_trigger,
+};
+
+/************************************************************************
+
+
+		pcm ops
+
+
+************************************************************************/
+static struct snd_pcm_hardware fsi_pcm_hardware = {
+	.info =		SNDRV_PCM_INFO_INTERLEAVED	|
+			SNDRV_PCM_INFO_MMAP		|
+			SNDRV_PCM_INFO_MMAP_VALID	|
+			SNDRV_PCM_INFO_PAUSE,
+	.formats		= FSI_FMTS,
+	.rates			= FSI_RATES,
+	.rate_min		= 8000,
+	.rate_max		= 192000,
+	.channels_min		= 1,
+	.channels_max		= 2,
+	.buffer_bytes_max	= 64 * 1024,
+	.period_bytes_min	= 32,
+	.period_bytes_max	= 8192,
+	.periods_min		= 1,
+	.periods_max		= 32,
+	.fifo_size		= 256,
+};
+
+static int fsi_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int ret = 0;
+
+	snd_soc_set_runtime_hwparams(substream, &fsi_pcm_hardware);
+
+	ret = snd_pcm_hw_constraint_integer(runtime,
+					    SNDRV_PCM_HW_PARAM_PERIODS);
+
+	return ret;
+}
+
+static int fsi_hw_params(struct snd_pcm_substream *substream,
+			 struct snd_pcm_hw_params *hw_params)
+{
+	return snd_pcm_lib_malloc_pages(substream,
+					params_buffer_bytes(hw_params));
+}
+
+static int fsi_hw_free(struct snd_pcm_substream *substream)
+{
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static snd_pcm_uframes_t fsi_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct fsi_priv *fsi = fsi_get(substream);
+	int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+	long location;
+
+	location = (fsi->byte_offset - 1) - fsi_get_residue(fsi, is_play);
+	if (location < 0)
+		location = 0;
+
+	return bytes_to_frames(runtime, location);
+}
+
+static struct snd_pcm_ops fsi_pcm_ops = {
+	.open		= fsi_pcm_open,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= fsi_hw_params,
+	.hw_free	= fsi_hw_free,
+	.pointer	= fsi_pointer,
+};
+
+/************************************************************************
+
+
+		snd_soc_platform
+
+
+************************************************************************/
+#define PREALLOC_BUFFER		(32 * 1024)
+#define PREALLOC_BUFFER_MAX	(32 * 1024)
+
+static void fsi_pcm_free(struct snd_pcm *pcm)
+{
+	snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static int fsi_pcm_new(struct snd_card *card,
+		       struct snd_soc_dai *dai,
+		       struct snd_pcm *pcm)
+{
+	/*
+	 * dont use SNDRV_DMA_TYPE_DEV, since it will oops the SH kernel
+	 * in MMAP mode (i.e. aplay -M)
+	 */
+	return snd_pcm_lib_preallocate_pages_for_all(
+		pcm,
+		SNDRV_DMA_TYPE_CONTINUOUS,
+		snd_dma_continuous_data(GFP_KERNEL),
+		PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);
+}
+
+/************************************************************************
+
+
+		alsa struct
+
+
+************************************************************************/
+struct snd_soc_dai fsi_soc_dai[] = {
+	{
+		.name			= "FSIA",
+		.id			= 0,
+		.playback = {
+			.rates		= FSI_RATES,
+			.formats	= FSI_FMTS,
+			.channels_min	= 1,
+			.channels_max	= 8,
+		},
+		/* capture not supported */
+		.ops = &fsi_dai_ops,
+	},
+	{
+		.name			= "FSIB",
+		.id			= 1,
+		.playback = {
+			.rates		= FSI_RATES,
+			.formats	= FSI_FMTS,
+			.channels_min	= 1,
+			.channels_max	= 8,
+		},
+		/* capture not supported */
+		.ops = &fsi_dai_ops,
+	},
+};
+EXPORT_SYMBOL_GPL(fsi_soc_dai);
+
+struct snd_soc_platform fsi_soc_platform = {
+	.name		= "fsi-pcm",
+	.pcm_ops 	= &fsi_pcm_ops,
+	.pcm_new	= fsi_pcm_new,
+	.pcm_free	= fsi_pcm_free,
+};
+EXPORT_SYMBOL_GPL(fsi_soc_platform);
+
+/************************************************************************
+
+
+		platform function
+
+
+************************************************************************/
+static int fsi_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	char clk_name[8];
+	unsigned int irq;
+	int ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	irq = platform_get_irq(pdev, 0);
+	if (!res || !irq) {
+		dev_err(&pdev->dev, "Not enough FSI platform resources.\n");
+		ret = -ENODEV;
+		goto exit;
+	}
+
+	master = kzalloc(sizeof(*master), GFP_KERNEL);
+	if (!master) {
+		dev_err(&pdev->dev, "Could not allocate master\n");
+		ret = -ENOMEM;
+		goto exit;
+	}
+
+	master->base = ioremap_nocache(res->start, resource_size(res));
+	if (!master->base) {
+		ret = -ENXIO;
+		dev_err(&pdev->dev, "Unable to ioremap FSI registers.\n");
+		goto exit_kfree;
+	}
+
+	master->irq		= irq;
+	master->info		= pdev->dev.platform_data;
+	master->fsia.base	= master->base;
+	master->fsib.base	= master->base + 0x40;
+
+	master->fsia.dma_chan = -1;
+	master->fsib.dma_chan = -1;
+
+	ret = fsi_get_dma_chan();
+	if (ret < 0) {
+		dev_err(&pdev->dev, "cannot get dma api\n");
+		goto exit_iounmap;
+	}
+
+	/* FSI is based on SPU mstp */
+	snprintf(clk_name, sizeof(clk_name), "spu%d", pdev->id);
+	master->clk = clk_get(NULL, clk_name);
+	if (IS_ERR(master->clk)) {
+		dev_err(&pdev->dev, "cannot get %s mstp\n", clk_name);
+		ret = -EIO;
+		goto exit_free_dma;
+	}
+
+	fsi_soc_dai[0].dev		= &pdev->dev;
+	fsi_soc_dai[1].dev		= &pdev->dev;
+
+	fsi_soft_all_reset();
+
+	ret = request_irq(irq, &fsi_interrupt, IRQF_DISABLED, "fsi", master);
+	if (ret) {
+		dev_err(&pdev->dev, "irq request err\n");
+		goto exit_free_dma;
+	}
+
+	ret = snd_soc_register_platform(&fsi_soc_platform);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "cannot snd soc register\n");
+		goto exit_free_irq;
+	}
+
+	return snd_soc_register_dais(fsi_soc_dai, ARRAY_SIZE(fsi_soc_dai));
+
+exit_free_irq:
+	free_irq(irq, master);
+exit_free_dma:
+	fsi_free_dma_chan();
+exit_iounmap:
+	iounmap(master->base);
+exit_kfree:
+	kfree(master);
+	master = NULL;
+exit:
+	return ret;
+}
+
+static int fsi_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_dais(fsi_soc_dai, ARRAY_SIZE(fsi_soc_dai));
+	snd_soc_unregister_platform(&fsi_soc_platform);
+
+	clk_put(master->clk);
+
+	fsi_free_dma_chan();
+
+	free_irq(master->irq, master);
+
+	iounmap(master->base);
+	kfree(master);
+	master = NULL;
+	return 0;
+}
+
+static struct platform_driver fsi_driver = {
+	.driver 	= {
+		.name	= "sh_fsi",
+	},
+	.probe		= fsi_probe,
+	.remove		= fsi_remove,
+};
+
+static int __init fsi_mobile_init(void)
+{
+	return platform_driver_register(&fsi_driver);
+}
+
+static void __exit fsi_mobile_exit(void)
+{
+	platform_driver_unregister(&fsi_driver);
+}
+module_init(fsi_mobile_init);
+module_exit(fsi_mobile_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SuperH onchip FSI audio driver");
+MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");