sound/soc/fsl/mpc5200_psc_ac97.c - maze/linux - Git at Google

 /*
  * linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip.
  *
  * Copyright (C) 2009 Jon Smirl, Digispeaker
  * Author: Jon Smirl <jonsmirl@gmail.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.
  */

 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
 #include <linux/delay.h>

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

 #include <asm/time.h>
 #include <asm/delay.h>
 #include <asm/mpc52xx_psc.h>

 #include "mpc5200_dma.h"
 #include "mpc5200_psc_ac97.h"

 #define DRV_NAME "mpc5200-psc-ac97"

 /* ALSA only supports a single AC97 device so static is recommend here */
 static struct psc_dma *psc_dma;

 static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
 {
 	int status;
 	unsigned int val;

 	mutex_lock(&psc_dma->mutex);

 	/* Wait for command send status zero = ready */
 	status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
 				MPC52xx_PSC_SR_CMDSEND), 100, 0);
 	if (status == 0) {
 		pr_err("timeout on ac97 bus (rdy)\n");
 		mutex_unlock(&psc_dma->mutex);
 		return -ENODEV;
 	}

 	/* Force clear the data valid bit */
 	in_be32(&psc_dma->psc_regs->ac97_data);

 	/* Send the read */
 	out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));

 	/* Wait for the answer */
 	status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
 				MPC52xx_PSC_SR_DATA_VAL), 100, 0);
 	if (status == 0) {
 		pr_err("timeout on ac97 read (val) %x\n",
 				in_be16(&psc_dma->psc_regs->sr_csr.status));
 		mutex_unlock(&psc_dma->mutex);
 		return -ENODEV;
 	}
 	/* Get the data */
 	val = in_be32(&psc_dma->psc_regs->ac97_data);
 	if (((val >> 24) & 0x7f) != reg) {
 		pr_err("reg echo error on ac97 read\n");
 		mutex_unlock(&psc_dma->mutex);
 		return -ENODEV;
 	}
 	val = (val >> 8) & 0xffff;

 	mutex_unlock(&psc_dma->mutex);
 	return (unsigned short) val;
 }

 static void psc_ac97_write(struct snd_ac97 *ac97,
 				unsigned short reg, unsigned short val)
 {
 	int status;

 	mutex_lock(&psc_dma->mutex);

 	/* Wait for command status zero = ready */
 	status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
 				MPC52xx_PSC_SR_CMDSEND), 100, 0);
 	if (status == 0) {
 		pr_err("timeout on ac97 bus (write)\n");
 		goto out;
 	}
 	/* Write data */
 	out_be32(&psc_dma->psc_regs->ac97_cmd,
 			((reg & 0x7f) << 24) | (val << 8));

  out:
 	mutex_unlock(&psc_dma->mutex);
 }

 static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
 {
 	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

 	out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
 	udelay(3);
 	out_be32(&regs->sicr, psc_dma->sicr);
 }

 static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
 {
 	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

 	/* Do a cold reset */
 	out_8(&regs->op1, MPC52xx_PSC_OP_RES);
 	udelay(10);
 	out_8(&regs->op0, MPC52xx_PSC_OP_RES);
 	msleep(1);
 	psc_ac97_warm_reset(ac97);
 }

 struct snd_ac97_bus_ops soc_ac97_ops = {
 	.read		= psc_ac97_read,
 	.write		= psc_ac97_write,
 	.reset		= psc_ac97_cold_reset,
 	.warm_reset	= psc_ac97_warm_reset,
 };
 EXPORT_SYMBOL_GPL(soc_ac97_ops);

 static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *params,
 				 struct snd_soc_dai *cpu_dai)
 {
 	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 	struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);

 	dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
 		" periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
 		" rate=%i format=%i\n",
 		__func__, substream, params_period_size(params),
 		params_period_bytes(params), params_periods(params),
 		params_buffer_size(params), params_buffer_bytes(params),
 		params_channels(params), params_rate(params),
 		params_format(params));

 	/* Determine the set of enable bits to turn on */
 	s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
 	if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
 		s->ac97_slot_bits <<= 16;
 	return 0;
 }

 static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *params,
 				 struct snd_soc_dai *cpu_dai)
 {
 	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);

 	dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);

 	if (params_channels(params) == 1)
 		out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
 	else
 		out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);

 	return 0;
 }

 static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 							struct snd_soc_dai *dai)
 {
 	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
 	struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
 			substream->pstr->stream);

 		/* Set the slot enable bits */
 		psc_dma->slots |= s->ac97_slot_bits;
 		out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 		dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
 			substream->pstr->stream);

 		/* Clear the slot enable bits */
 		psc_dma->slots &= ~(s->ac97_slot_bits);
 		out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 		break;
 	}
 	return 0;
 }

 static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
 {
 	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

 	/* Go */
 	out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 	return 0;
 }

 /* ---------------------------------------------------------------------
  * ALSA SoC Bindings
  *
  * - Digital Audio Interface (DAI) template
  * - create/destroy dai hooks
  */

 /**
  * psc_ac97_dai_template: template CPU Digital Audio Interface
  */
 static struct snd_soc_dai_ops psc_ac97_analog_ops = {
 	.hw_params	= psc_ac97_hw_analog_params,
 	.trigger	= psc_ac97_trigger,
 };

 static struct snd_soc_dai_ops psc_ac97_digital_ops = {
 	.hw_params	= psc_ac97_hw_digital_params,
 };

 static struct snd_soc_dai_driver psc_ac97_dai[] = {
 {
 	.ac97_control = 1,
 	.probe	= psc_ac97_probe,
 	.playback = {
 		.channels_min   = 1,
 		.channels_max   = 6,
 		.rates          = SNDRV_PCM_RATE_8000_48000,
 		.formats = SNDRV_PCM_FMTBIT_S32_BE,
 	},
 	.capture = {
 		.channels_min   = 1,
 		.channels_max   = 2,
 		.rates          = SNDRV_PCM_RATE_8000_48000,
 		.formats = SNDRV_PCM_FMTBIT_S32_BE,
 	},
 	.ops = &psc_ac97_analog_ops,
 },
 {
 	.ac97_control = 1,
 	.playback = {
 		.channels_min   = 1,
 		.channels_max   = 2,
 		.rates          = SNDRV_PCM_RATE_32000 | \
 			SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
 		.formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
 	},
 	.ops = &psc_ac97_digital_ops,
 } };


 /* ---------------------------------------------------------------------
  * OF platform bus binding code:
  * - Probe/remove operations
  * - OF device match table
  */
 static int __devinit psc_ac97_of_probe(struct of_device *op,
 				      const struct of_device_id *match)
 {
 	int rc;
 	struct snd_ac97 ac97;
 	struct mpc52xx_psc __iomem *regs;

 	rc = snd_soc_register_dais(&op->dev, psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
 	if (rc != 0) {
 		dev_err(&op->dev, "Failed to register DAI\n");
 		return rc;
 	}

 	psc_dma = dev_get_drvdata(&op->dev);
 	regs = psc_dma->psc_regs;
 	ac97.private_data = psc_dma;

 	psc_dma->imr = 0;
 	out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);

 	/* Configure the serial interface mode to AC97 */
 	psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
 	out_be32(&regs->sicr, psc_dma->sicr);

 	/* No slots active */
 	out_be32(&regs->ac97_slots, 0x00000000);

 	return 0;
 }

 static int __devexit psc_ac97_of_remove(struct of_device *op)
 {
 	snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_ac97_dai));
 	return 0;
 }

 /* Match table for of_platform binding */
 static struct of_device_id psc_ac97_match[] __devinitdata = {
 	{ .compatible = "fsl,mpc5200-psc-ac97", },
 	{ .compatible = "fsl,mpc5200b-psc-ac97", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, psc_ac97_match);

 static struct of_platform_driver psc_ac97_driver = {
 	.probe = psc_ac97_of_probe,
 	.remove = __devexit_p(psc_ac97_of_remove),
 	.driver = {
 		.name = "mpc5200-psc-ac97",
 		.owner = THIS_MODULE,
 		.of_match_table = psc_ac97_match,
 	},
 };

 /* ---------------------------------------------------------------------
  * Module setup and teardown; simply register the of_platform driver
  * for the PSC in AC97 mode.
  */
 static int __init psc_ac97_init(void)
 {
 	return of_register_platform_driver(&psc_ac97_driver);
 }
 module_init(psc_ac97_init);

 static void __exit psc_ac97_exit(void)
 {
 	of_unregister_platform_driver(&psc_ac97_driver);
 }
 module_exit(psc_ac97_exit);

 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
 MODULE_DESCRIPTION("mpc5200 AC97 module");
 MODULE_LICENSE("GPL");
	/*
	* linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip.
	*
	* Copyright (C) 2009 Jon Smirl, Digispeaker
	* Author: Jon Smirl <jonsmirl@gmail.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.
	*/

	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/of_platform.h>
	#include <linux/delay.h>

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

	#include <asm/time.h>
	#include <asm/delay.h>
	#include <asm/mpc52xx_psc.h>

	#include "mpc5200_dma.h"
	#include "mpc5200_psc_ac97.h"

	#define DRV_NAME "mpc5200-psc-ac97"

	/* ALSA only supports a single AC97 device so static is recommend here */
	static struct psc_dma *psc_dma;

	static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
	{
	int status;
	unsigned int val;

	mutex_lock(&psc_dma->mutex);

	/* Wait for command send status zero = ready */
	status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
	MPC52xx_PSC_SR_CMDSEND), 100, 0);
	if (status == 0) {
	pr_err("timeout on ac97 bus (rdy)\n");
	mutex_unlock(&psc_dma->mutex);
	return -ENODEV;
	}

	/* Force clear the data valid bit */
	in_be32(&psc_dma->psc_regs->ac97_data);

	/* Send the read */
	out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) \| ((reg & 0x7f) << 24));

	/* Wait for the answer */
	status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
	MPC52xx_PSC_SR_DATA_VAL), 100, 0);
	if (status == 0) {
	pr_err("timeout on ac97 read (val) %x\n",
	in_be16(&psc_dma->psc_regs->sr_csr.status));
	mutex_unlock(&psc_dma->mutex);
	return -ENODEV;
	}
	/* Get the data */
	val = in_be32(&psc_dma->psc_regs->ac97_data);
	if (((val >> 24) & 0x7f) != reg) {
	pr_err("reg echo error on ac97 read\n");
	mutex_unlock(&psc_dma->mutex);
	return -ENODEV;
	}
	val = (val >> 8) & 0xffff;

	mutex_unlock(&psc_dma->mutex);
	return (unsigned short) val;
	}

	static void psc_ac97_write(struct snd_ac97 *ac97,
	unsigned short reg, unsigned short val)
	{
	int status;

	mutex_lock(&psc_dma->mutex);

	/* Wait for command status zero = ready */
	status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
	MPC52xx_PSC_SR_CMDSEND), 100, 0);
	if (status == 0) {
	pr_err("timeout on ac97 bus (write)\n");
	goto out;
	}
	/* Write data */
	out_be32(&psc_dma->psc_regs->ac97_cmd,
	((reg & 0x7f) << 24) \| (val << 8));

	out:
	mutex_unlock(&psc_dma->mutex);
	}

	static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
	{
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

	out_be32(&regs->sicr, psc_dma->sicr \| MPC52xx_PSC_SICR_AWR);
	udelay(3);
	out_be32(&regs->sicr, psc_dma->sicr);
	}

	static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
	{
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

	/* Do a cold reset */
	out_8(&regs->op1, MPC52xx_PSC_OP_RES);
	udelay(10);
	out_8(&regs->op0, MPC52xx_PSC_OP_RES);
	msleep(1);
	psc_ac97_warm_reset(ac97);
	}

	struct snd_ac97_bus_ops soc_ac97_ops = {
	.read = psc_ac97_read,
	.write = psc_ac97_write,
	.reset = psc_ac97_cold_reset,
	.warm_reset = psc_ac97_warm_reset,
	};
	EXPORT_SYMBOL_GPL(soc_ac97_ops);

	static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *cpu_dai)
	{
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
	struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);

	dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
	" periods=%i buffer_size=%i buffer_bytes=%i channels=%i"
	" rate=%i format=%i\n",
	__func__, substream, params_period_size(params),
	params_period_bytes(params), params_periods(params),
	params_buffer_size(params), params_buffer_bytes(params),
	params_channels(params), params_rate(params),
	params_format(params));

	/* Determine the set of enable bits to turn on */
	s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
	if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
	s->ac97_slot_bits <<= 16;
	return 0;
	}

	static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *cpu_dai)
	{
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);

	dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);

	if (params_channels(params) == 1)
	out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
	else
	out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);

	return 0;
	}

	static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
	struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
	substream->pstr->stream);

	/* Set the slot enable bits */
	psc_dma->slots \|= s->ac97_slot_bits;
	out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
	substream->pstr->stream);

	/* Clear the slot enable bits */
	psc_dma->slots &= ~(s->ac97_slot_bits);
	out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
	break;
	}
	return 0;
	}

	static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
	{
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

	/* Go */
	out_8(&regs->command, MPC52xx_PSC_TX_ENABLE \| MPC52xx_PSC_RX_ENABLE);
	return 0;
	}

	/* ---------------------------------------------------------------------
	* ALSA SoC Bindings
	*
	* - Digital Audio Interface (DAI) template
	* - create/destroy dai hooks
	*/

	/**
	* psc_ac97_dai_template: template CPU Digital Audio Interface
	*/
	static struct snd_soc_dai_ops psc_ac97_analog_ops = {
	.hw_params = psc_ac97_hw_analog_params,
	.trigger = psc_ac97_trigger,
	};

	static struct snd_soc_dai_ops psc_ac97_digital_ops = {
	.hw_params = psc_ac97_hw_digital_params,
	};

	static struct snd_soc_dai_driver psc_ac97_dai[] = {
	{
	.ac97_control = 1,
	.probe = psc_ac97_probe,
	.playback = {
	.channels_min = 1,
	.channels_max = 6,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S32_BE,
	},
	.capture = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S32_BE,
	},
	.ops = &psc_ac97_analog_ops,
	},
	{
	.ac97_control = 1,
	.playback = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_32000 \| \
	SNDRV_PCM_RATE_44100 \| SNDRV_PCM_RATE_48000,
	.formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
	},
	.ops = &psc_ac97_digital_ops,
	} };



	/* ---------------------------------------------------------------------
	* OF platform bus binding code:
	* - Probe/remove operations
	* - OF device match table
	*/
	static int __devinit psc_ac97_of_probe(struct of_device *op,
	const struct of_device_id *match)
	{
	int rc;
	struct snd_ac97 ac97;
	struct mpc52xx_psc __iomem *regs;

	rc = snd_soc_register_dais(&op->dev, psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
	if (rc != 0) {
	dev_err(&op->dev, "Failed to register DAI\n");
	return rc;
	}

	psc_dma = dev_get_drvdata(&op->dev);
	regs = psc_dma->psc_regs;
	ac97.private_data = psc_dma;

	psc_dma->imr = 0;
	out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);

	/* Configure the serial interface mode to AC97 */
	psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 \| MPC52xx_PSC_SICR_ENAC97;
	out_be32(&regs->sicr, psc_dma->sicr);

	/* No slots active */
	out_be32(&regs->ac97_slots, 0x00000000);

	return 0;
	}

	static int __devexit psc_ac97_of_remove(struct of_device *op)
	{
	snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_ac97_dai));
	return 0;
	}

	/* Match table for of_platform binding */
	static struct of_device_id psc_ac97_match[] __devinitdata = {
	{ .compatible = "fsl,mpc5200-psc-ac97", },
	{ .compatible = "fsl,mpc5200b-psc-ac97", },
	{}
	};
	MODULE_DEVICE_TABLE(of, psc_ac97_match);

	static struct of_platform_driver psc_ac97_driver = {
	.probe = psc_ac97_of_probe,
	.remove = __devexit_p(psc_ac97_of_remove),
	.driver = {
	.name = "mpc5200-psc-ac97",
	.owner = THIS_MODULE,
	.of_match_table = psc_ac97_match,
	},
	};

	/* ---------------------------------------------------------------------
	* Module setup and teardown; simply register the of_platform driver
	* for the PSC in AC97 mode.
	*/
	static int __init psc_ac97_init(void)
	{
	return of_register_platform_driver(&psc_ac97_driver);
	}
	module_init(psc_ac97_init);

	static void __exit psc_ac97_exit(void)
	{
	of_unregister_platform_driver(&psc_ac97_driver);
	}
	module_exit(psc_ac97_exit);

	MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
	MODULE_DESCRIPTION("mpc5200 AC97 module");
	MODULE_LICENSE("GPL");