sound/soc/omap/omap-mcbsp.c - kernel/msm-4.9 - Gitiles

 /*
  * omap-mcbsp.c  --  OMAP ALSA SoC DAI driver using McBSP port
  *
  * Copyright (C) 2008 Nokia Corporation
  *
  * Contact: Jarkko Nikula <jhnikula@gmail.com>
  *          Peter Ujfalusi <peter.ujfalusi@nokia.com>
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/device.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/initval.h>
 #include <sound/soc.h>

 #include <mach/control.h>
 #include <mach/dma.h>
 #include <mach/mcbsp.h>
 #include "omap-mcbsp.h"
 #include "omap-pcm.h"

 #define OMAP_MCBSP_RATES	(SNDRV_PCM_RATE_8000_96000)

 struct omap_mcbsp_data {
 	unsigned int			bus_id;
 	struct omap_mcbsp_reg_cfg	regs;
 	unsigned int			fmt;
 	/*
 	 * Flags indicating is the bus already activated and configured by
 	 * another substream
 	 */
 	int				active;
 	int				configured;
 };

 #define to_mcbsp(priv)	container_of((priv), struct omap_mcbsp_data, bus_id)

 static struct omap_mcbsp_data mcbsp_data[NUM_LINKS];

 /*
  * Stream DMA parameters. DMA request line and port address are set runtime
  * since they are different between OMAP1 and later OMAPs
  */
 static struct omap_pcm_dma_data omap_mcbsp_dai_dma_params[NUM_LINKS][2];

 #if defined(CONFIG_ARCH_OMAP15XX) || defined(CONFIG_ARCH_OMAP16XX)
 static const int omap1_dma_reqs[][2] = {
 	{ OMAP_DMA_MCBSP1_TX, OMAP_DMA_MCBSP1_RX },
 	{ OMAP_DMA_MCBSP2_TX, OMAP_DMA_MCBSP2_RX },
 	{ OMAP_DMA_MCBSP3_TX, OMAP_DMA_MCBSP3_RX },
 };
 static const unsigned long omap1_mcbsp_port[][2] = {
 	{ OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
 	  OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
 	{ OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
 	  OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
 	{ OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DXR1,
 	  OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DRR1 },
 };
 #else
 static const int omap1_dma_reqs[][2] = {};
 static const unsigned long omap1_mcbsp_port[][2] = {};
 #endif

 #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
 static const int omap24xx_dma_reqs[][2] = {
 	{ OMAP24XX_DMA_MCBSP1_TX, OMAP24XX_DMA_MCBSP1_RX },
 	{ OMAP24XX_DMA_MCBSP2_TX, OMAP24XX_DMA_MCBSP2_RX },
 #if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
 	{ OMAP24XX_DMA_MCBSP3_TX, OMAP24XX_DMA_MCBSP3_RX },
 	{ OMAP24XX_DMA_MCBSP4_TX, OMAP24XX_DMA_MCBSP4_RX },
 	{ OMAP24XX_DMA_MCBSP5_TX, OMAP24XX_DMA_MCBSP5_RX },
 #endif
 };
 #else
 static const int omap24xx_dma_reqs[][2] = {};
 #endif

 #if defined(CONFIG_ARCH_OMAP2420)
 static const unsigned long omap2420_mcbsp_port[][2] = {
 	{ OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
 	  OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
 	{ OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
 	  OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
 };
 #else
 static const unsigned long omap2420_mcbsp_port[][2] = {};
 #endif

 #if defined(CONFIG_ARCH_OMAP2430)
 static const unsigned long omap2430_mcbsp_port[][2] = {
 	{ OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
 	{ OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
 	{ OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
 	{ OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
 	{ OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
 };
 #else
 static const unsigned long omap2430_mcbsp_port[][2] = {};
 #endif

 #if defined(CONFIG_ARCH_OMAP34XX)
 static const unsigned long omap34xx_mcbsp_port[][2] = {
 	{ OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
 	{ OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
 	{ OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
 	{ OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
 	{ OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
 	  OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
 };
 #else
 static const unsigned long omap34xx_mcbsp_port[][2] = {};
 #endif

 static void omap_mcbsp_set_threshold(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 	int dma_op_mode = omap_mcbsp_get_dma_op_mode(mcbsp_data->bus_id);
 	int samples;

 	/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
 	if (dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
 		samples = snd_pcm_lib_period_bytes(substream) >> 1;
 	else
 		samples = 1;

 	/* Configure McBSP internal buffer usage */
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		omap_mcbsp_set_tx_threshold(mcbsp_data->bus_id, samples - 1);
 	else
 		omap_mcbsp_set_rx_threshold(mcbsp_data->bus_id, samples - 1);
 }

 static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream,
 				  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 omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 	int bus_id = mcbsp_data->bus_id;
 	int err = 0;

 	if (!cpu_dai->active)
 		err = omap_mcbsp_request(bus_id);

 	if (cpu_is_omap343x()) {
 		int dma_op_mode = omap_mcbsp_get_dma_op_mode(bus_id);
 		int max_period;

 		/*
 		 * McBSP2 in OMAP3 has 1024 * 32-bit internal audio buffer.
 		 * Set constraint for minimum buffer size to the same than FIFO
 		 * size in order to avoid underruns in playback startup because
 		 * HW is keeping the DMA request active until FIFO is filled.
 		 */
 		if (bus_id == 1)
 			snd_pcm_hw_constraint_minmax(substream->runtime,
 					SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 					4096, UINT_MAX);

 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			max_period = omap_mcbsp_get_max_tx_threshold(bus_id);
 		else
 			max_period = omap_mcbsp_get_max_rx_threshold(bus_id);

 		max_period++;
 		max_period <<= 1;

 		if (dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
 			snd_pcm_hw_constraint_minmax(substream->runtime,
 						SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 						32, max_period);
 	}

 	return err;
 }

 static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream,
 				    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 omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);

 	if (!cpu_dai->active) {
 		omap_mcbsp_free(mcbsp_data->bus_id);
 		mcbsp_data->configured = 0;
 	}
 }

 static int omap_mcbsp_dai_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 omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 	int err = 0, play = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		mcbsp_data->active++;
 		omap_mcbsp_start(mcbsp_data->bus_id, play, !play);
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		omap_mcbsp_stop(mcbsp_data->bus_id, play, !play);
 		mcbsp_data->active--;
 		break;
 	default:
 		err = -EINVAL;
 	}

 	return err;
 }

 static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
 				    struct snd_pcm_hw_params *params,
 				    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 omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 	int dma, bus_id = mcbsp_data->bus_id, id = cpu_dai->id;
 	int wlen, channels, wpf, sync_mode = OMAP_DMA_SYNC_ELEMENT;
 	unsigned long port;
 	unsigned int format;

 	if (cpu_class_is_omap1()) {
 		dma = omap1_dma_reqs[bus_id][substream->stream];
 		port = omap1_mcbsp_port[bus_id][substream->stream];
 	} else if (cpu_is_omap2420()) {
 		dma = omap24xx_dma_reqs[bus_id][substream->stream];
 		port = omap2420_mcbsp_port[bus_id][substream->stream];
 	} else if (cpu_is_omap2430()) {
 		dma = omap24xx_dma_reqs[bus_id][substream->stream];
 		port = omap2430_mcbsp_port[bus_id][substream->stream];
 	} else if (cpu_is_omap343x()) {
 		dma = omap24xx_dma_reqs[bus_id][substream->stream];
 		port = omap34xx_mcbsp_port[bus_id][substream->stream];
 		omap_mcbsp_dai_dma_params[id][substream->stream].set_threshold =
 						omap_mcbsp_set_threshold;
 		/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
 		if (omap_mcbsp_get_dma_op_mode(bus_id) ==
 						MCBSP_DMA_MODE_THRESHOLD)
 			sync_mode = OMAP_DMA_SYNC_FRAME;
 	} else {
 		return -ENODEV;
 	}
 	omap_mcbsp_dai_dma_params[id][substream->stream].name =
 		substream->stream ? "Audio Capture" : "Audio Playback";
 	omap_mcbsp_dai_dma_params[id][substream->stream].dma_req = dma;
 	omap_mcbsp_dai_dma_params[id][substream->stream].port_addr = port;
 	omap_mcbsp_dai_dma_params[id][substream->stream].sync_mode = sync_mode;
 	cpu_dai->dma_data = &omap_mcbsp_dai_dma_params[id][substream->stream];

 	if (mcbsp_data->configured) {
 		/* McBSP already configured by another stream */
 		return 0;
 	}

 	format = mcbsp_data->fmt & SND_SOC_DAIFMT_FORMAT_MASK;
 	wpf = channels = params_channels(params);
 	switch (channels) {
 	case 2:
 		if (format == SND_SOC_DAIFMT_I2S) {
 			/* Use dual-phase frames */
 			regs->rcr2	|= RPHASE;
 			regs->xcr2	|= XPHASE;
 			/* Set 1 word per (McBSP) frame for phase1 and phase2 */
 			wpf--;
 			regs->rcr2	|= RFRLEN2(wpf - 1);
 			regs->xcr2	|= XFRLEN2(wpf - 1);
 		}
 	case 1:
 	case 4:
 		/* Set word per (McBSP) frame for phase1 */
 		regs->rcr1	|= RFRLEN1(wpf - 1);
 		regs->xcr1	|= XFRLEN1(wpf - 1);
 		break;
 	default:
 		/* Unsupported number of channels */
 		return -EINVAL;
 	}

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		/* Set word lengths */
 		wlen = 16;
 		regs->rcr2	|= RWDLEN2(OMAP_MCBSP_WORD_16);
 		regs->rcr1	|= RWDLEN1(OMAP_MCBSP_WORD_16);
 		regs->xcr2	|= XWDLEN2(OMAP_MCBSP_WORD_16);
 		regs->xcr1	|= XWDLEN1(OMAP_MCBSP_WORD_16);
 		break;
 	default:
 		/* Unsupported PCM format */
 		return -EINVAL;
 	}

 	/* Set FS period and length in terms of bit clock periods */
 	switch (format) {
 	case SND_SOC_DAIFMT_I2S:
 		regs->srgr2	|= FPER(wlen * channels - 1);
 		regs->srgr1	|= FWID(wlen - 1);
 		break;
 	case SND_SOC_DAIFMT_DSP_A:
 	case SND_SOC_DAIFMT_DSP_B:
 		regs->srgr2	|= FPER(wlen * channels - 1);
 		regs->srgr1	|= FWID(0);
 		break;
 	}

 	omap_mcbsp_config(bus_id, &mcbsp_data->regs);
 	mcbsp_data->configured = 1;

 	return 0;
 }

 /*
  * This must be called before _set_clkdiv and _set_sysclk since McBSP register
  * cache is initialized here
  */
 static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 				      unsigned int fmt)
 {
 	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 	unsigned int temp_fmt = fmt;

 	if (mcbsp_data->configured)
 		return 0;

 	mcbsp_data->fmt = fmt;
 	memset(regs, 0, sizeof(*regs));
 	/* Generic McBSP register settings */
 	regs->spcr2	|= XINTM(3) | FREE;
 	regs->spcr1	|= RINTM(3);
 	/* RFIG and XFIG are not defined in 34xx */
 	if (!cpu_is_omap34xx()) {
 		regs->rcr2	|= RFIG;
 		regs->xcr2	|= XFIG;
 	}
 	if (cpu_is_omap2430() || cpu_is_omap34xx()) {
 		regs->xccr = DXENDLY(1) | XDMAEN | XDISABLE;
 		regs->rccr = RFULL_CYCLE | RDMAEN | RDISABLE;
 	}

 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		/* 1-bit data delay */
 		regs->rcr2	|= RDATDLY(1);
 		regs->xcr2	|= XDATDLY(1);
 		break;
 	case SND_SOC_DAIFMT_DSP_A:
 		/* 1-bit data delay */
 		regs->rcr2      |= RDATDLY(1);
 		regs->xcr2      |= XDATDLY(1);
 		/* Invert FS polarity configuration */
 		temp_fmt ^= SND_SOC_DAIFMT_NB_IF;
 		break;
 	case SND_SOC_DAIFMT_DSP_B:
 		/* 0-bit data delay */
 		regs->rcr2      |= RDATDLY(0);
 		regs->xcr2      |= XDATDLY(0);
 		/* Invert FS polarity configuration */
 		temp_fmt ^= SND_SOC_DAIFMT_NB_IF;
 		break;
 	default:
 		/* Unsupported data format */
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		/* McBSP master. Set FS and bit clocks as outputs */
 		regs->pcr0	|= FSXM | FSRM |
 				   CLKXM | CLKRM;
 		/* Sample rate generator drives the FS */
 		regs->srgr2	|= FSGM;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		/* McBSP slave */
 		break;
 	default:
 		/* Unsupported master/slave configuration */
 		return -EINVAL;
 	}

 	/* Set bit clock (CLKX/CLKR) and FS polarities */
 	switch (temp_fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		/*
 		 * Normal BCLK + FS.
 		 * FS active low. TX data driven on falling edge of bit clock
 		 * and RX data sampled on rising edge of bit clock.
 		 */
 		regs->pcr0	|= FSXP | FSRP |
 				   CLKXP | CLKRP;
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		regs->pcr0	|= CLKXP | CLKRP;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		regs->pcr0	|= FSXP | FSRP;
 		break;
 	case SND_SOC_DAIFMT_IB_IF:
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int omap_mcbsp_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
 				     int div_id, int div)
 {
 	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;

 	if (div_id != OMAP_MCBSP_CLKGDV)
 		return -ENODEV;

 	regs->srgr1	|= CLKGDV(div - 1);

 	return 0;
 }

 static int omap_mcbsp_dai_set_clks_src(struct omap_mcbsp_data *mcbsp_data,
 				       int clk_id)
 {
 	int sel_bit;
 	u16 reg, reg_devconf1 = OMAP243X_CONTROL_DEVCONF1;

 	if (cpu_class_is_omap1()) {
 		/* OMAP1's can use only external source clock */
 		if (unlikely(clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK))
 			return -EINVAL;
 		else
 			return 0;
 	}

 	if (cpu_is_omap2420() && mcbsp_data->bus_id > 1)
 		return -EINVAL;

 	if (cpu_is_omap343x())
 		reg_devconf1 = OMAP343X_CONTROL_DEVCONF1;

 	switch (mcbsp_data->bus_id) {
 	case 0:
 		reg = OMAP2_CONTROL_DEVCONF0;
 		sel_bit = 2;
 		break;
 	case 1:
 		reg = OMAP2_CONTROL_DEVCONF0;
 		sel_bit = 6;
 		break;
 	case 2:
 		reg = reg_devconf1;
 		sel_bit = 0;
 		break;
 	case 3:
 		reg = reg_devconf1;
 		sel_bit = 2;
 		break;
 	case 4:
 		reg = reg_devconf1;
 		sel_bit = 4;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK)
 		omap_ctrl_writel(omap_ctrl_readl(reg) & ~(1 << sel_bit), reg);
 	else
 		omap_ctrl_writel(omap_ctrl_readl(reg) | (1 << sel_bit), reg);

 	return 0;
 }

 static int omap_mcbsp_dai_set_rcvr_src(struct omap_mcbsp_data *mcbsp_data,
 				       int clk_id)
 {
 	int sel_bit, set = 0;
 	u16 reg = OMAP2_CONTROL_DEVCONF0;

 	if (cpu_class_is_omap1())
 		return -EINVAL; /* TODO: Can this be implemented for OMAP1? */
 	if (mcbsp_data->bus_id != 0)
 		return -EINVAL;

 	switch (clk_id) {
 	case OMAP_MCBSP_CLKR_SRC_CLKX:
 		set = 1;
 	case OMAP_MCBSP_CLKR_SRC_CLKR:
 		sel_bit = 3;
 		break;
 	case OMAP_MCBSP_FSR_SRC_FSX:
 		set = 1;
 	case OMAP_MCBSP_FSR_SRC_FSR:
 		sel_bit = 4;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (set)
 		omap_ctrl_writel(omap_ctrl_readl(reg) | (1 << sel_bit), reg);
 	else
 		omap_ctrl_writel(omap_ctrl_readl(reg) & ~(1 << sel_bit), reg);

 	return 0;
 }

 static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 					 int clk_id, unsigned int freq,
 					 int dir)
 {
 	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 	int err = 0;

 	switch (clk_id) {
 	case OMAP_MCBSP_SYSCLK_CLK:
 		regs->srgr2	|= CLKSM;
 		break;
 	case OMAP_MCBSP_SYSCLK_CLKS_FCLK:
 	case OMAP_MCBSP_SYSCLK_CLKS_EXT:
 		err = omap_mcbsp_dai_set_clks_src(mcbsp_data, clk_id);
 		break;

 	case OMAP_MCBSP_SYSCLK_CLKX_EXT:
 		regs->srgr2	|= CLKSM;
 	case OMAP_MCBSP_SYSCLK_CLKR_EXT:
 		regs->pcr0	|= SCLKME;
 		break;

 	case OMAP_MCBSP_CLKR_SRC_CLKR:
 	case OMAP_MCBSP_CLKR_SRC_CLKX:
 	case OMAP_MCBSP_FSR_SRC_FSR:
 	case OMAP_MCBSP_FSR_SRC_FSX:
 		err = omap_mcbsp_dai_set_rcvr_src(mcbsp_data, clk_id);
 		break;
 	default:
 		err = -ENODEV;
 	}

 	return err;
 }

 static struct snd_soc_dai_ops omap_mcbsp_dai_ops = {
 	.startup	= omap_mcbsp_dai_startup,
 	.shutdown	= omap_mcbsp_dai_shutdown,
 	.trigger	= omap_mcbsp_dai_trigger,
 	.hw_params	= omap_mcbsp_dai_hw_params,
 	.set_fmt	= omap_mcbsp_dai_set_dai_fmt,
 	.set_clkdiv	= omap_mcbsp_dai_set_clkdiv,
 	.set_sysclk	= omap_mcbsp_dai_set_dai_sysclk,
 };

 #define OMAP_MCBSP_DAI_BUILDER(link_id)				\
 {								\
 	.name = "omap-mcbsp-dai-"#link_id,			\
 	.id = (link_id),					\
 	.playback = {						\
 		.channels_min = 1,				\
 		.channels_max = 4,				\
 		.rates = OMAP_MCBSP_RATES,			\
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,		\
 	},							\
 	.capture = {						\
 		.channels_min = 1,				\
 		.channels_max = 4,				\
 		.rates = OMAP_MCBSP_RATES,			\
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,		\
 	},							\
 	.ops = &omap_mcbsp_dai_ops,				\
 	.private_data = &mcbsp_data[(link_id)].bus_id,		\
 }

 struct snd_soc_dai omap_mcbsp_dai[] = {
 	OMAP_MCBSP_DAI_BUILDER(0),
 	OMAP_MCBSP_DAI_BUILDER(1),
 #if NUM_LINKS >= 3
 	OMAP_MCBSP_DAI_BUILDER(2),
 #endif
 #if NUM_LINKS == 5
 	OMAP_MCBSP_DAI_BUILDER(3),
 	OMAP_MCBSP_DAI_BUILDER(4),
 #endif
 };

 EXPORT_SYMBOL_GPL(omap_mcbsp_dai);

 static int __init snd_omap_mcbsp_init(void)
 {
 	return snd_soc_register_dais(omap_mcbsp_dai,
 				     ARRAY_SIZE(omap_mcbsp_dai));
 }
 module_init(snd_omap_mcbsp_init);

 static void __exit snd_omap_mcbsp_exit(void)
 {
 	snd_soc_unregister_dais(omap_mcbsp_dai, ARRAY_SIZE(omap_mcbsp_dai));
 }
 module_exit(snd_omap_mcbsp_exit);

 MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
 MODULE_DESCRIPTION("OMAP I2S SoC Interface");
 MODULE_LICENSE("GPL");
	/*
	* omap-mcbsp.c -- OMAP ALSA SoC DAI driver using McBSP port
	*
	* Copyright (C) 2008 Nokia Corporation
	*
	* Contact: Jarkko Nikula <jhnikula@gmail.com>
	* Peter Ujfalusi <peter.ujfalusi@nokia.com>
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/device.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/initval.h>
	#include <sound/soc.h>

	#include <mach/control.h>
	#include <mach/dma.h>
	#include <mach/mcbsp.h>
	#include "omap-mcbsp.h"
	#include "omap-pcm.h"

	#define OMAP_MCBSP_RATES (SNDRV_PCM_RATE_8000_96000)

	struct omap_mcbsp_data {
	unsigned int bus_id;
	struct omap_mcbsp_reg_cfg regs;
	unsigned int fmt;
	/*
	* Flags indicating is the bus already activated and configured by
	* another substream
	*/
	int active;
	int configured;
	};

	#define to_mcbsp(priv) container_of((priv), struct omap_mcbsp_data, bus_id)

	static struct omap_mcbsp_data mcbsp_data[NUM_LINKS];

	/*
	* Stream DMA parameters. DMA request line and port address are set runtime
	* since they are different between OMAP1 and later OMAPs
	*/
	static struct omap_pcm_dma_data omap_mcbsp_dai_dma_params[NUM_LINKS][2];

	#if defined(CONFIG_ARCH_OMAP15XX) \|\| defined(CONFIG_ARCH_OMAP16XX)
	static const int omap1_dma_reqs[][2] = {
	{ OMAP_DMA_MCBSP1_TX, OMAP_DMA_MCBSP1_RX },
	{ OMAP_DMA_MCBSP2_TX, OMAP_DMA_MCBSP2_RX },
	{ OMAP_DMA_MCBSP3_TX, OMAP_DMA_MCBSP3_RX },
	};
	static const unsigned long omap1_mcbsp_port[][2] = {
	{ OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
	OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
	{ OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
	OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
	{ OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DXR1,
	OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DRR1 },
	};
	#else
	static const int omap1_dma_reqs[][2] = {};
	static const unsigned long omap1_mcbsp_port[][2] = {};
	#endif

	#if defined(CONFIG_ARCH_OMAP24XX) \|\| defined(CONFIG_ARCH_OMAP34XX)
	static const int omap24xx_dma_reqs[][2] = {
	{ OMAP24XX_DMA_MCBSP1_TX, OMAP24XX_DMA_MCBSP1_RX },
	{ OMAP24XX_DMA_MCBSP2_TX, OMAP24XX_DMA_MCBSP2_RX },
	#if defined(CONFIG_ARCH_OMAP2430) \|\| defined(CONFIG_ARCH_OMAP34XX)
	{ OMAP24XX_DMA_MCBSP3_TX, OMAP24XX_DMA_MCBSP3_RX },
	{ OMAP24XX_DMA_MCBSP4_TX, OMAP24XX_DMA_MCBSP4_RX },
	{ OMAP24XX_DMA_MCBSP5_TX, OMAP24XX_DMA_MCBSP5_RX },
	#endif
	};
	#else
	static const int omap24xx_dma_reqs[][2] = {};
	#endif

	#if defined(CONFIG_ARCH_OMAP2420)
	static const unsigned long omap2420_mcbsp_port[][2] = {
	{ OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
	OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
	{ OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
	OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
	};
	#else
	static const unsigned long omap2420_mcbsp_port[][2] = {};
	#endif

	#if defined(CONFIG_ARCH_OMAP2430)
	static const unsigned long omap2430_mcbsp_port[][2] = {
	{ OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
	OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
	{ OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
	OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
	{ OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
	OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
	{ OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
	OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
	{ OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
	OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
	};
	#else
	static const unsigned long omap2430_mcbsp_port[][2] = {};
	#endif

	#if defined(CONFIG_ARCH_OMAP34XX)
	static const unsigned long omap34xx_mcbsp_port[][2] = {
	{ OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
	OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
	{ OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
	OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
	{ OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
	OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
	{ OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
	OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
	{ OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
	OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
	};
	#else
	static const unsigned long omap34xx_mcbsp_port[][2] = {};
	#endif

	static void omap_mcbsp_set_threshold(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
	int dma_op_mode = omap_mcbsp_get_dma_op_mode(mcbsp_data->bus_id);
	int samples;

	/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
	if (dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
	samples = snd_pcm_lib_period_bytes(substream) >> 1;
	else
	samples = 1;

	/* Configure McBSP internal buffer usage */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	omap_mcbsp_set_tx_threshold(mcbsp_data->bus_id, samples - 1);
	else
	omap_mcbsp_set_rx_threshold(mcbsp_data->bus_id, samples - 1);
	}

	static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream,
	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 omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
	int bus_id = mcbsp_data->bus_id;
	int err = 0;

	if (!cpu_dai->active)
	err = omap_mcbsp_request(bus_id);

	if (cpu_is_omap343x()) {
	int dma_op_mode = omap_mcbsp_get_dma_op_mode(bus_id);
	int max_period;

	/*
	* McBSP2 in OMAP3 has 1024 * 32-bit internal audio buffer.
	* Set constraint for minimum buffer size to the same than FIFO
	* size in order to avoid underruns in playback startup because
	* HW is keeping the DMA request active until FIFO is filled.
	*/
	if (bus_id == 1)
	snd_pcm_hw_constraint_minmax(substream->runtime,
	SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	4096, UINT_MAX);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	max_period = omap_mcbsp_get_max_tx_threshold(bus_id);
	else
	max_period = omap_mcbsp_get_max_rx_threshold(bus_id);

	max_period++;
	max_period <<= 1;

	if (dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
	snd_pcm_hw_constraint_minmax(substream->runtime,
	SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
	32, max_period);
	}

	return err;
	}

	static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream,
	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 omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);

	if (!cpu_dai->active) {
	omap_mcbsp_free(mcbsp_data->bus_id);
	mcbsp_data->configured = 0;
	}
	}

	static int omap_mcbsp_dai_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 omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
	int err = 0, play = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	mcbsp_data->active++;
	omap_mcbsp_start(mcbsp_data->bus_id, play, !play);
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	omap_mcbsp_stop(mcbsp_data->bus_id, play, !play);
	mcbsp_data->active--;
	break;
	default:
	err = -EINVAL;
	}

	return err;
	}

	static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	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 omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
	int dma, bus_id = mcbsp_data->bus_id, id = cpu_dai->id;
	int wlen, channels, wpf, sync_mode = OMAP_DMA_SYNC_ELEMENT;
	unsigned long port;
	unsigned int format;

	if (cpu_class_is_omap1()) {
	dma = omap1_dma_reqs[bus_id][substream->stream];
	port = omap1_mcbsp_port[bus_id][substream->stream];
	} else if (cpu_is_omap2420()) {
	dma = omap24xx_dma_reqs[bus_id][substream->stream];
	port = omap2420_mcbsp_port[bus_id][substream->stream];
	} else if (cpu_is_omap2430()) {
	dma = omap24xx_dma_reqs[bus_id][substream->stream];
	port = omap2430_mcbsp_port[bus_id][substream->stream];
	} else if (cpu_is_omap343x()) {
	dma = omap24xx_dma_reqs[bus_id][substream->stream];
	port = omap34xx_mcbsp_port[bus_id][substream->stream];
	omap_mcbsp_dai_dma_params[id][substream->stream].set_threshold =
	omap_mcbsp_set_threshold;
	/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
	if (omap_mcbsp_get_dma_op_mode(bus_id) ==
	MCBSP_DMA_MODE_THRESHOLD)
	sync_mode = OMAP_DMA_SYNC_FRAME;
	} else {
	return -ENODEV;
	}
	omap_mcbsp_dai_dma_params[id][substream->stream].name =
	substream->stream ? "Audio Capture" : "Audio Playback";
	omap_mcbsp_dai_dma_params[id][substream->stream].dma_req = dma;
	omap_mcbsp_dai_dma_params[id][substream->stream].port_addr = port;
	omap_mcbsp_dai_dma_params[id][substream->stream].sync_mode = sync_mode;
	cpu_dai->dma_data = &omap_mcbsp_dai_dma_params[id][substream->stream];

	if (mcbsp_data->configured) {
	/* McBSP already configured by another stream */
	return 0;
	}

	format = mcbsp_data->fmt & SND_SOC_DAIFMT_FORMAT_MASK;
	wpf = channels = params_channels(params);
	switch (channels) {
	case 2:
	if (format == SND_SOC_DAIFMT_I2S) {
	/* Use dual-phase frames */
	regs->rcr2 \|= RPHASE;
	regs->xcr2 \|= XPHASE;
	/* Set 1 word per (McBSP) frame for phase1 and phase2 */
	wpf--;
	regs->rcr2 \|= RFRLEN2(wpf - 1);
	regs->xcr2 \|= XFRLEN2(wpf - 1);
	}
	case 1:
	case 4:
	/* Set word per (McBSP) frame for phase1 */
	regs->rcr1 \|= RFRLEN1(wpf - 1);
	regs->xcr1 \|= XFRLEN1(wpf - 1);
	break;
	default:
	/* Unsupported number of channels */
	return -EINVAL;
	}

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	/* Set word lengths */
	wlen = 16;
	regs->rcr2 \|= RWDLEN2(OMAP_MCBSP_WORD_16);
	regs->rcr1 \|= RWDLEN1(OMAP_MCBSP_WORD_16);
	regs->xcr2 \|= XWDLEN2(OMAP_MCBSP_WORD_16);
	regs->xcr1 \|= XWDLEN1(OMAP_MCBSP_WORD_16);
	break;
	default:
	/* Unsupported PCM format */
	return -EINVAL;
	}

	/* Set FS period and length in terms of bit clock periods */
	switch (format) {
	case SND_SOC_DAIFMT_I2S:
	regs->srgr2 \|= FPER(wlen * channels - 1);
	regs->srgr1 \|= FWID(wlen - 1);
	break;
	case SND_SOC_DAIFMT_DSP_A:
	case SND_SOC_DAIFMT_DSP_B:
	regs->srgr2 \|= FPER(wlen * channels - 1);
	regs->srgr1 \|= FWID(0);
	break;
	}

	omap_mcbsp_config(bus_id, &mcbsp_data->regs);
	mcbsp_data->configured = 1;

	return 0;
	}

	/*
	* This must be called before _set_clkdiv and _set_sysclk since McBSP register
	* cache is initialized here
	*/
	static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
	unsigned int fmt)
	{
	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
	unsigned int temp_fmt = fmt;

	if (mcbsp_data->configured)
	return 0;

	mcbsp_data->fmt = fmt;
	memset(regs, 0, sizeof(*regs));
	/* Generic McBSP register settings */
	regs->spcr2 \|= XINTM(3) \| FREE;
	regs->spcr1 \|= RINTM(3);
	/* RFIG and XFIG are not defined in 34xx */
	if (!cpu_is_omap34xx()) {
	regs->rcr2 \|= RFIG;
	regs->xcr2 \|= XFIG;
	}
	if (cpu_is_omap2430() \|\| cpu_is_omap34xx()) {
	regs->xccr = DXENDLY(1) \| XDMAEN \| XDISABLE;
	regs->rccr = RFULL_CYCLE \| RDMAEN \| RDISABLE;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	/* 1-bit data delay */
	regs->rcr2 \|= RDATDLY(1);
	regs->xcr2 \|= XDATDLY(1);
	break;
	case SND_SOC_DAIFMT_DSP_A:
	/* 1-bit data delay */
	regs->rcr2 \|= RDATDLY(1);
	regs->xcr2 \|= XDATDLY(1);
	/* Invert FS polarity configuration */
	temp_fmt ^= SND_SOC_DAIFMT_NB_IF;
	break;
	case SND_SOC_DAIFMT_DSP_B:
	/* 0-bit data delay */
	regs->rcr2 \|= RDATDLY(0);
	regs->xcr2 \|= XDATDLY(0);
	/* Invert FS polarity configuration */
	temp_fmt ^= SND_SOC_DAIFMT_NB_IF;
	break;
	default:
	/* Unsupported data format */
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	/* McBSP master. Set FS and bit clocks as outputs */
	regs->pcr0 \|= FSXM \| FSRM \|
	CLKXM \| CLKRM;
	/* Sample rate generator drives the FS */
	regs->srgr2 \|= FSGM;
	break;
	case SND_SOC_DAIFMT_CBM_CFM:
	/* McBSP slave */
	break;
	default:
	/* Unsupported master/slave configuration */
	return -EINVAL;
	}

	/* Set bit clock (CLKX/CLKR) and FS polarities */
	switch (temp_fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	/*
	* Normal BCLK + FS.
	* FS active low. TX data driven on falling edge of bit clock
	* and RX data sampled on rising edge of bit clock.
	*/
	regs->pcr0 \|= FSXP \| FSRP \|
	CLKXP \| CLKRP;
	break;
	case SND_SOC_DAIFMT_NB_IF:
	regs->pcr0 \|= CLKXP \| CLKRP;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	regs->pcr0 \|= FSXP \| FSRP;
	break;
	case SND_SOC_DAIFMT_IB_IF:
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int omap_mcbsp_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
	int div_id, int div)
	{
	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;

	if (div_id != OMAP_MCBSP_CLKGDV)
	return -ENODEV;

	regs->srgr1 \|= CLKGDV(div - 1);

	return 0;
	}

	static int omap_mcbsp_dai_set_clks_src(struct omap_mcbsp_data *mcbsp_data,
	int clk_id)
	{
	int sel_bit;
	u16 reg, reg_devconf1 = OMAP243X_CONTROL_DEVCONF1;

	if (cpu_class_is_omap1()) {
	/* OMAP1's can use only external source clock */
	if (unlikely(clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK))
	return -EINVAL;
	else
	return 0;
	}

	if (cpu_is_omap2420() && mcbsp_data->bus_id > 1)
	return -EINVAL;

	if (cpu_is_omap343x())
	reg_devconf1 = OMAP343X_CONTROL_DEVCONF1;

	switch (mcbsp_data->bus_id) {
	case 0:
	reg = OMAP2_CONTROL_DEVCONF0;
	sel_bit = 2;
	break;
	case 1:
	reg = OMAP2_CONTROL_DEVCONF0;
	sel_bit = 6;
	break;
	case 2:
	reg = reg_devconf1;
	sel_bit = 0;
	break;
	case 3:
	reg = reg_devconf1;
	sel_bit = 2;
	break;
	case 4:
	reg = reg_devconf1;
	sel_bit = 4;
	break;
	default:
	return -EINVAL;
	}

	if (clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK)
	omap_ctrl_writel(omap_ctrl_readl(reg) & ~(1 << sel_bit), reg);
	else
	omap_ctrl_writel(omap_ctrl_readl(reg) \| (1 << sel_bit), reg);

	return 0;
	}

	static int omap_mcbsp_dai_set_rcvr_src(struct omap_mcbsp_data *mcbsp_data,
	int clk_id)
	{
	int sel_bit, set = 0;
	u16 reg = OMAP2_CONTROL_DEVCONF0;

	if (cpu_class_is_omap1())
	return -EINVAL; /* TODO: Can this be implemented for OMAP1? */
	if (mcbsp_data->bus_id != 0)
	return -EINVAL;

	switch (clk_id) {
	case OMAP_MCBSP_CLKR_SRC_CLKX:
	set = 1;
	case OMAP_MCBSP_CLKR_SRC_CLKR:
	sel_bit = 3;
	break;
	case OMAP_MCBSP_FSR_SRC_FSX:
	set = 1;
	case OMAP_MCBSP_FSR_SRC_FSR:
	sel_bit = 4;
	break;
	default:
	return -EINVAL;
	}

	if (set)
	omap_ctrl_writel(omap_ctrl_readl(reg) \| (1 << sel_bit), reg);
	else
	omap_ctrl_writel(omap_ctrl_readl(reg) & ~(1 << sel_bit), reg);

	return 0;
	}

	static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
	int clk_id, unsigned int freq,
	int dir)
	{
	struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
	struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
	int err = 0;

	switch (clk_id) {
	case OMAP_MCBSP_SYSCLK_CLK:
	regs->srgr2 \|= CLKSM;
	break;
	case OMAP_MCBSP_SYSCLK_CLKS_FCLK:
	case OMAP_MCBSP_SYSCLK_CLKS_EXT:
	err = omap_mcbsp_dai_set_clks_src(mcbsp_data, clk_id);
	break;

	case OMAP_MCBSP_SYSCLK_CLKX_EXT:
	regs->srgr2 \|= CLKSM;
	case OMAP_MCBSP_SYSCLK_CLKR_EXT:
	regs->pcr0 \|= SCLKME;
	break;

	case OMAP_MCBSP_CLKR_SRC_CLKR:
	case OMAP_MCBSP_CLKR_SRC_CLKX:
	case OMAP_MCBSP_FSR_SRC_FSR:
	case OMAP_MCBSP_FSR_SRC_FSX:
	err = omap_mcbsp_dai_set_rcvr_src(mcbsp_data, clk_id);
	break;
	default:
	err = -ENODEV;
	}

	return err;
	}

	static struct snd_soc_dai_ops omap_mcbsp_dai_ops = {
	.startup = omap_mcbsp_dai_startup,
	.shutdown = omap_mcbsp_dai_shutdown,
	.trigger = omap_mcbsp_dai_trigger,
	.hw_params = omap_mcbsp_dai_hw_params,
	.set_fmt = omap_mcbsp_dai_set_dai_fmt,
	.set_clkdiv = omap_mcbsp_dai_set_clkdiv,
	.set_sysclk = omap_mcbsp_dai_set_dai_sysclk,
	};

	#define OMAP_MCBSP_DAI_BUILDER(link_id) \
	{ \
	.name = "omap-mcbsp-dai-"#link_id, \
	.id = (link_id), \
	.playback = { \
	.channels_min = 1, \
	.channels_max = 4, \
	.rates = OMAP_MCBSP_RATES, \
	.formats = SNDRV_PCM_FMTBIT_S16_LE, \
	}, \
	.capture = { \
	.channels_min = 1, \
	.channels_max = 4, \
	.rates = OMAP_MCBSP_RATES, \
	.formats = SNDRV_PCM_FMTBIT_S16_LE, \
	}, \
	.ops = &omap_mcbsp_dai_ops, \
	.private_data = &mcbsp_data[(link_id)].bus_id, \
	}

	struct snd_soc_dai omap_mcbsp_dai[] = {
	OMAP_MCBSP_DAI_BUILDER(0),
	OMAP_MCBSP_DAI_BUILDER(1),
	#if NUM_LINKS >= 3
	OMAP_MCBSP_DAI_BUILDER(2),
	#endif
	#if NUM_LINKS == 5
	OMAP_MCBSP_DAI_BUILDER(3),
	OMAP_MCBSP_DAI_BUILDER(4),
	#endif
	};

	EXPORT_SYMBOL_GPL(omap_mcbsp_dai);

	static int __init snd_omap_mcbsp_init(void)
	{
	return snd_soc_register_dais(omap_mcbsp_dai,
	ARRAY_SIZE(omap_mcbsp_dai));
	}
	module_init(snd_omap_mcbsp_init);

	static void __exit snd_omap_mcbsp_exit(void)
	{
	snd_soc_unregister_dais(omap_mcbsp_dai, ARRAY_SIZE(omap_mcbsp_dai));
	}
	module_exit(snd_omap_mcbsp_exit);

	MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
	MODULE_DESCRIPTION("OMAP I2S SoC Interface");
	MODULE_LICENSE("GPL");