path: root/sound/soc/samsung/i2s.c

/* sound/soc/samsung/i2s.c
 *
 * ALSA SoC Audio Layer - Samsung I2S Controller driver
 *
 * Copyright (c) 2010 Samsung Electronics Co. Ltd.
 *	Jaswinder Singh <jassisinghbrar@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/delay.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/pm_runtime.h>

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

#include <mach/dma.h>

#include <linux/platform_data/asoc-s3c.h>

#include "dma.h"
#include "idma.h"
#include "i2s.h"
#include "i2s-regs.h"

#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)

enum samsung_dai_type {
	TYPE_PRI,
	TYPE_SEC,
};

struct samsung_i2s_dai_data {
	int dai_type;
};

struct i2s_dai {
	/* Platform device for this DAI */
	struct platform_device *pdev;
	/* IOREMAP'd SFRs */
	void __iomem	*addr;
	/* Physical base address of SFRs */
	u32	base;
	/* Rate of RCLK source clock */
	unsigned long rclk_srcrate;
	/* Frame Clock */
	unsigned frmclk;
	/*
	 * Specifically requested RCLK,BCLK by MACHINE Driver.
	 * 0 indicates CPU driver is free to choose any value.
	 */
	unsigned rfs, bfs;
	/* I2S Controller's core clock */
	struct clk *clk;
	/* Clock for generating I2S signals */
	struct clk *op_clk;
	/* Pointer to the Primary_Fifo if this is Sec_Fifo, NULL otherwise */
	struct i2s_dai *pri_dai;
	/* Pointer to the Secondary_Fifo if it has one, NULL otherwise */
	struct i2s_dai *sec_dai;
#define DAI_OPENED	(1 << 0) /* Dai is opened */
#define DAI_MANAGER	(1 << 1) /* Dai is the manager */
	unsigned mode;
	/* Driver for this DAI */
	struct snd_soc_dai_driver i2s_dai_drv;
	/* DMA parameters */
	struct s3c_dma_params dma_playback;
	struct s3c_dma_params dma_capture;
	struct s3c_dma_params idma_playback;
	u32	quirks;
	u32	suspend_i2smod;
	u32	suspend_i2scon;
	u32	suspend_i2spsr;
	unsigned long gpios[7];	/* i2s gpio line numbers */
};

/* Lock for cross i/f checks */
static DEFINE_SPINLOCK(lock);

/* If this is the 'overlay' stereo DAI */
static inline bool is_secondary(struct i2s_dai *i2s)
{
	return i2s->pri_dai ? true : false;
}

/* If operating in SoC-Slave mode */
static inline bool is_slave(struct i2s_dai *i2s)
{
	return (readl(i2s->addr + I2SMOD) & MOD_SLAVE) ? true : false;
}

/* If this interface of the controller is transmitting data */
static inline bool tx_active(struct i2s_dai *i2s)
{
	u32 active;

	if (!i2s)
		return false;

	active = readl(i2s->addr + I2SCON);

	if (is_secondary(i2s))
		active &= CON_TXSDMA_ACTIVE;
	else