[ALSA] ASoC AT91RM92000 eti_b1 machine support

/*

 * eti_b1_wm8731  --  SoC audio for Endrelia ETI_B1.

 *

 * Author:	Frank Mandarino <fmandarino@endrelia.com>

 *		Endrelia Technologies Inc.

 * Created:	Mar 29, 2006

 *

 * Based on corgi.c by:

 *

 * Copyright 2005 Wolfson Microelectronics PLC.

 * Copyright 2005 Openedhand Ltd.

 *

 * Authors: Liam Girdwood <liam.girdwood@wolfsonmicro.com>

 *          Richard Purdie <richard@openedhand.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.

 *

 *  Revision history

 *    30th Nov 2005   Initial version.

 *

 */

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/version.h>

#include <linux/kernel.h>

#include <linux/clk.h>

#include <linux/timer.h>

#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <sound/driver.h>

#include <sound/core.h>

#include <sound/pcm.h>

#include <sound/soc.h>

#include <sound/soc-dapm.h>

#include <asm/arch/at91rm9200.h>

#include <asm/arch/gpio.h>

#include <asm/arch/hardware.h>

#include "../codecs/wm8731.h"

#include "at91rm9200-pcm.h"

#if 0

#define	DBG(x...)	printk(KERN_INFO "eti_b1_wm8731:" x)

#else

#define	DBG(x...)

#endif

static struct clk *pck1_clk;

static struct clk *pllb_clk;

static int eti_b1_startup(snd_pcm_substream_t *substream)

{

	/* Start PCK1 clock. */

	clk_enable(pck1_clk);

	DBG("pck1 started\n");

	return 0;

}

static void eti_b1_shutdown(snd_pcm_substream_t *substream)

{

	/* Stop PCK1 clock. */

	clk_disable(pck1_clk);

	DBG("pck1 stopped\n");

}

static struct snd_soc_ops eti_b1_ops = {

	.startup = eti_b1_startup,

	.shutdown = eti_b1_shutdown,

};

static const struct snd_soc_dapm_widget eti_b1_dapm_widgets[] = {

	SND_SOC_DAPM_MIC("Int Mic", NULL),

	SND_SOC_DAPM_SPK("Ext Spk", NULL),

};

static const char *intercon[][3] = {

	/* speaker connected to LHPOUT */

	{"Ext Spk", NULL, "LHPOUT"},

	/* mic is connected to Mic Jack, with WM8731 Mic Bias */

	{"MICIN", NULL, "Mic Bias"},

	{"Mic Bias", NULL, "Int Mic"},

	/* terminator */

	{NULL, NULL, NULL},

};

/*

 * Logic for a wm8731 as connected on a Endrelia ETI-B1 board.

 */

static int eti_b1_wm8731_init(struct snd_soc_codec *codec)

{

	int i;

	DBG("eti_b1_wm8731_init() called\n");

	/* Add specific widgets */

	for(i = 0; i < ARRAY_SIZE(eti_b1_dapm_widgets); i++) {

		snd_soc_dapm_new_control(codec, &eti_b1_dapm_widgets[i]);

	}

	/* Set up specific audio path interconnects */

	for(i = 0; intercon[i][0] != NULL; i++) {

		snd_soc_dapm_connect_input(codec, intercon[i][0],

			intercon[i][1], intercon[i][2]);

	}

	/* not connected */

	snd_soc_dapm_set_endpoint(codec, "RLINEIN", 0);

	snd_soc_dapm_set_endpoint(codec, "LLINEIN", 0);

	/* always connected */

	snd_soc_dapm_set_endpoint(codec, "Int Mic", 1);

	snd_soc_dapm_set_endpoint(codec, "Ext Spk", 1);

	snd_soc_dapm_sync_endpoints(codec);

	return 0;

}

unsigned int eti_b1_config_sysclk(struct snd_soc_pcm_runtime *rtd,

	struct snd_soc_clock_info *info)

{

	if(info->bclk_master & SND_SOC_DAIFMT_CBS_CFS) {

		return rtd->codec_dai->config_sysclk(rtd->codec_dai, info, 12000000);

	}

	return 0;

}

static struct snd_soc_dai_link eti_b1_dai = {

	.name = "WM8731",

	.stream_name = "WM8731",

	.cpu_dai = &at91rm9200_i2s_dai[1],

	.codec_dai = &wm8731_dai,

	.init = eti_b1_wm8731_init,

	.config_sysclk = eti_b1_config_sysclk,

};

static struct snd_soc_machine snd_soc_machine_eti_b1 = {

	.name = "ETI_B1",

	.dai_link = &eti_b1_dai,

	.num_links = 1,

	.ops = &eti_b1_ops,

};

static struct wm8731_setup_data eti_b1_wm8731_setup = {

	.i2c_address = 0x1a,

};

static struct snd_soc_device eti_b1_snd_devdata = {

	.machine = &snd_soc_machine_eti_b1,

	.platform = &at91rm9200_soc_platform,

	.codec_dev = &soc_codec_dev_wm8731,

	.codec_data = &eti_b1_wm8731_setup,

};

static struct platform_device *eti_b1_snd_device;

static int __init eti_b1_init(void)

{

	int ret;

	u32 ssc_pio_lines;

	eti_b1_snd_device = platform_device_alloc("soc-audio", -1);

	if (!eti_b1_snd_device)

		return -ENOMEM;

	platform_set_drvdata(eti_b1_snd_device, &eti_b1_snd_devdata);

	eti_b1_snd_devdata.dev = &eti_b1_snd_device->dev;

	ret = platform_device_add(eti_b1_snd_device);

	if (ret) {

		platform_device_put(eti_b1_snd_device);

		return ret;

	}

 	ssc_pio_lines = AT91_PB6_TF1 | AT91_PB7_TK1 | AT91_PB8_TD1

			| AT91_PB9_RD1 /* | AT91_PB10_RK1 | AT91_PB11_RF1 */;

	/* Reset all PIO registers and assign lines to peripheral A */

 	at91_sys_write(AT91_PIOB + PIO_PDR,  ssc_pio_lines);

 	at91_sys_write(AT91_PIOB + PIO_ODR,  ssc_pio_lines);

 	at91_sys_write(AT91_PIOB + PIO_IFDR, ssc_pio_lines);

 	at91_sys_write(AT91_PIOB + PIO_CODR, ssc_pio_lines);

 	at91_sys_write(AT91_PIOB + PIO_IDR,  ssc_pio_lines);

 	at91_sys_write(AT91_PIOB + PIO_MDDR, ssc_pio_lines);

 	at91_sys_write(AT91_PIOB + PIO_PUDR, ssc_pio_lines);

 	at91_sys_write(AT91_PIOB + PIO_ASR,  ssc_pio_lines);

 	at91_sys_write(AT91_PIOB + PIO_OWDR, ssc_pio_lines);

	/*

	 * Set PCK1 parent to PLLB and its rate to 12 Mhz.

	 */

	pllb_clk = clk_get(NULL, "pllb");

	pck1_clk = clk_get(NULL, "pck1");

	clk_set_parent(pck1_clk, pllb_clk);

	clk_set_rate(pck1_clk, 12000000);

	DBG("MCLK rate %luHz\n", clk_get_rate(pck1_clk));

	/* assign the GPIO pin to PCK1 */

	at91_set_B_periph(AT91_PIN_PA24, 0);

	return ret;

}

static void __exit eti_b1_exit(void)

{

	clk_put(pck1_clk);

	clk_put(pllb_clk);

	platform_device_unregister(eti_b1_snd_device);

}

module_init(eti_b1_init);

module_exit(eti_b1_exit);

/* Module information */

MODULE_AUTHOR("Frank Mandarino <fmandarino@endrelia.com>");

MODULE_DESCRIPTION("ALSA SoC ETI-B1-WM8731");

MODULE_LICENSE("GPL");