/*
 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
 *  JZ4740 platform timer support
 *
 *  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.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifndef __MIPS_JZ4740_TIMER_H__
#define __MIPS_JZ4740_TIMER_H__

#include <linux/module.h>
#include <linux/io.h>

#define JZ_REG_TIMER_STOP		0x0C
#define JZ_REG_TIMER_STOP_SET		0x1C
#define JZ_REG_TIMER_STOP_CLEAR		0x2C
#define JZ_REG_TIMER_ENABLE		0x00
#define JZ_REG_TIMER_ENABLE_SET		0x04
#define JZ_REG_TIMER_ENABLE_CLEAR	0x08
#define JZ_REG_TIMER_FLAG		0x10
#define JZ_REG_TIMER_FLAG_SET		0x14
#define JZ_REG_TIMER_FLAG_CLEAR		0x18
#define JZ_REG_TIMER_MASK		0x20
#define JZ_REG_TIMER_MASK_SET		0x24
#define JZ_REG_TIMER_MASK_CLEAR		0x28

#define JZ_REG_TIMER_DFR(x) (((x) * 0x10) + 0x30)
#define JZ_REG_TIMER_DHR(x) (((x) * 0x10) + 0x34)
#define JZ_REG_TIMER_CNT(x) (((x) * 0x10) + 0x38)
#define JZ_REG_TIMER_CTRL(x) (((x) * 0x10) + 0x3C)

#define JZ_TIMER_IRQ_HALF(x) BIT((x) + 0x10)
#define JZ_TIMER_IRQ_FULL(x) BIT(x)

#define JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN	BIT(9)
#define JZ_TIMER_CTRL_PWM_ACTIVE_LOW		BIT(8)
#define JZ_TIMER_CTRL_PWM_ENABLE		BIT(7)
#define JZ_TIMER_CTRL_PRESCALE_MASK		0x1c
#define JZ_TIMER_CTRL_PRESCALE_OFFSET		0x3
#define JZ_TIMER_CTRL_PRESCALE_1		(0 << 3)
#define JZ_TIMER_CTRL_PRESCALE_4		(1 << 3)
#define JZ_TIMER_CTRL_PRESCALE_16		(2 << 3)
#define JZ_TIMER_CTRL_PRESCALE_64		(3 << 3)
#define JZ_TIMER_CTRL_PRESCALE_256		(4 << 3)
#define JZ_TIMER_CTRL_PRESCALE_1024		(5 << 3)

#define JZ_TIMER_CTRL_PRESCALER(x) ((x) << JZ_TIMER_CTRL_PRESCALE_OFFSET)

#define JZ_TIMER_CTRL_SRC_EXT		BIT(2)
#define JZ_TIMER_CTRL_SRC_RTC		BIT(1)
#define JZ_TIMER_CTRL_SRC_PCLK		BIT(0)

extern void __iomem *jz4740_timer_base;
void __init jz4740_timer_init(void);

static inline void jz4740_timer_stop(unsigned int timer)
{
	writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
}

static inline void jz4740_timer_start(unsigned int timer)
{
	writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);
}

static inline bool jz4740_timer_is_enabled(unsigned int timer)
{
	return readb(jz4740_timer_base + JZ_REG_TIMER_ENABLE) & BIT(timer);
}

static inline void jz4740_timer_enable(unsigned int timer)
{
	writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_SET);
}

static inline void jz4740_timer_disable(unsigned int timer)
{
	writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_CLEAR);
}


static inline void jz4740_timer_set_period(unsigned int timer, uint16_t period)
{
	writew(period, jz4740_timer_base + JZ_REG_TIMER_DFR(timer));
}

static inline void jz4740_timer_set_duty(unsigned int timer, uint16_t duty)
{
	writew(duty, jz4740_timer_base + JZ_REG_TIMER_DHR(timer));
}

static inline void jz4740_timer_set_count(unsigned int timer, uint16_t count)
{
	writew(count, jz4740_timer_base + JZ_REG_TIMER_CNT(timer));
}

static inline uint16_t jz4740_timer_get_count(unsigned int timer)
{
	return readw(jz4740_timer_base + JZ_REG_TIMER_CNT(timer));
}

static inline void jz4740_timer_ack_full(unsigned int timer)
{
	writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR);
}

static inline void jz4740_timer_irq_full_enable(unsigned int timer)
{
	writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR);
	writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_CLEAR);
}

static inline void jz4740_timer_irq_full_disable(unsigned int timer)
{
	writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_SET);
}

static inline void jz4740_timer_set_ctrl(unsigned int timer, uint16_t ctrl)
{
	writew(ctrl, jz4740_timer_base + JZ_REG_TIMER_CTRL(timer));
}

static inline uint16_t jz4740_timer_get_ctrl(unsigned int timer)
{
	return readw(jz4740_timer_base + JZ_REG_TIMER_CTRL(timer));
}

#endif