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Commit 544a7324 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Ralf Baechle
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MIPS: JZ4740: Add timer support 



Add support for the timer/counter unit on a JZ4740 SoC.  This code is used
as a common base for the JZ4740 clocksource/clockevent implementation and
PWM support.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1396/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 9869848d

arch/mips/include/asm/mach-jz4740/timer.h

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/*

 *  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 __ASM_MACH_JZ4740_TIMER

#define __ASM_MACH_JZ4740_TIMER



void jz4740_timer_enable_watchdog(void);

void jz4740_timer_disable_watchdog(void);



#endif

arch/mips/jz4740/timer.c

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/*

 *  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.

 *

 */



#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>



#include "timer.h"



#include <asm/mach-jz4740/base.h>



void __iomem *jz4740_timer_base;



void jz4740_timer_enable_watchdog(void)

{

	writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);

}



void jz4740_timer_disable_watchdog(void)

{

	writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);

}



void __init jz4740_timer_init(void)

{

	jz4740_timer_base = ioremap(JZ4740_TCU_BASE_ADDR, 0x100);



	if (!jz4740_timer_base)

		panic("Failed to ioremap timer registers");



	/* Disable all timer clocks except for those used as system timers */

	writel(0x000100fc, jz4740_timer_base + JZ_REG_TIMER_STOP_SET);



	/* Timer irqs are unmasked by default, mask them */

	writel(0x00ff00ff, jz4740_timer_base + JZ_REG_TIMER_MASK_SET);

}

arch/mips/jz4740/timer.h

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Original line number Diff line number Diff line 
/*

 *  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