Commit 58b5369e authored by wanzongshun's avatar wanzongshun Committed by Russell King
Browse files

ARM: 5674/1: Add clocksource/clockevent support for w90p910 platform 



Add clocksource/clockevent support for w90p910 platform.

Signed-off-by: default avatarWan ZongShun <mcuos.com@gmail.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent ae45b1c6

arch/arm/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -495,6 +495,8 @@ config ARCH_W90X900 
	select GENERIC_GPIO

	select HAVE_CLK

	select COMMON_CLKDEV

	select GENERIC_TIME

	select GENERIC_CLOCKEVENTS

	help

		Support for Nuvoton (Winbond logic dept.) ARM9 processor,You

		can login www.mcuos.com or www.nuvoton.com to know more.

arch/arm/mach-w90x900/clock.c

+6 −0
Original line number Diff line number Diff line
@@ -55,6 +55,12 @@ void clk_disable(struct clk *clk) 
}

EXPORT_SYMBOL(clk_disable);



unsigned long clk_get_rate(struct clk *clk)

{

	return 15000000;

}

EXPORT_SYMBOL(clk_get_rate);



void w90x900_clk_enable(struct clk *clk, int enable)

{

	unsigned int clocks = clk->cken;

arch/arm/mach-w90x900/time.c

+127 −24
Original line number Diff line number Diff line
@@ -3,7 +3,7 @@ 
 *

 * Based on linux/arch/arm/plat-s3c24xx/time.c by Ben Dooks

 *

 * Copyright (c) 2008 Nuvoton technology corporation

 * Copyright (c) 2009 Nuvoton technology corporation

 * All rights reserved.

 *

 * Wan ZongShun <mcuos.com@gmail.com>
@@ -23,6 +23,8 @@ 
#include <linux/clk.h>

#include <linux/io.h>

#include <linux/leds.h>

#include <linux/clocksource.h>

#include <linux/clockchips.h>



#include <asm/mach-types.h>

#include <asm/mach/irq.h>
@@ -31,49 +33,150 @@ 
#include <mach/map.h>

#include <mach/regs-timer.h>



static unsigned long w90x900_gettimeoffset(void)

#define RESETINT	0x1f

#define PERIOD		(0x01 << 27)

#define ONESHOT		(0x00 << 27)

#define COUNTEN		(0x01 << 30)

#define INTEN		(0x01 << 29)



#define TICKS_PER_SEC	100

#define PRESCALE	0x63 /* Divider = prescale + 1 */



unsigned int timer0_load;



static void w90p910_clockevent_setmode(enum clock_event_mode mode,

		struct clock_event_device *clk)

{

	unsigned int val;



	val = __raw_readl(REG_TCSR0);

	val &= ~(0x03 << 27);



	switch (mode) {

	case CLOCK_EVT_MODE_PERIODIC:

		__raw_writel(timer0_load, REG_TICR0);

		val |= (PERIOD | COUNTEN | INTEN | PRESCALE);

		break;



	case CLOCK_EVT_MODE_ONESHOT:

		val |= (ONESHOT | COUNTEN | INTEN | PRESCALE);

		break;



	case CLOCK_EVT_MODE_UNUSED:

	case CLOCK_EVT_MODE_SHUTDOWN:

	case CLOCK_EVT_MODE_RESUME:

		break;

	}



	__raw_writel(val, REG_TCSR0);

}



static int w90p910_clockevent_setnextevent(unsigned long evt,

		struct clock_event_device *clk)

{

	unsigned int val;



	__raw_writel(evt, REG_TICR0);



	val = __raw_readl(REG_TCSR0);

	val |= (COUNTEN | INTEN | PRESCALE);

	__raw_writel(val, REG_TCSR0);



	return 0;

}



static struct clock_event_device w90p910_clockevent_device = {

	.name		= "w90p910-timer0",

	.shift		= 32,

	.features	= CLOCK_EVT_MODE_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,

	.set_mode	= w90p910_clockevent_setmode,

	.set_next_event	= w90p910_clockevent_setnextevent,

	.rating		= 300,

};



/*IRQ handler for the timer*/



static irqreturn_t

w90x900_timer_interrupt(int irq, void *dev_id)

static irqreturn_t w90p910_timer0_interrupt(int irq, void *dev_id)

{

	timer_tick();

	struct clock_event_device *evt = &w90p910_clockevent_device;



	__raw_writel(0x01, REG_TISR); /* clear TIF0 */



	evt->event_handler(evt);

	return IRQ_HANDLED;

}



static struct irqaction w90x900_timer_irq = {

	.name		= "w90x900 Timer Tick",

static struct irqaction w90p910_timer0_irq = {

	.name		= "w90p910-timer0",

	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,

	.handler	= w90x900_timer_interrupt,

	.handler	= w90p910_timer0_interrupt,

};



/*Set up timer reg.*/

static void __init w90p910_clockevents_init(unsigned int rate)

{

	w90p910_clockevent_device.mult = div_sc(rate, NSEC_PER_SEC,

					w90p910_clockevent_device.shift);

	w90p910_clockevent_device.max_delta_ns = clockevent_delta2ns(0xffffffff,

					&w90p910_clockevent_device);

	w90p910_clockevent_device.min_delta_ns = clockevent_delta2ns(0xf,

					&w90p910_clockevent_device);

	w90p910_clockevent_device.cpumask = cpumask_of(0);



static void w90x900_timer_setup(void)

	clockevents_register_device(&w90p910_clockevent_device);

}



static cycle_t w90p910_get_cycles(struct clocksource *cs)

{

	__raw_writel(0, REG_TCSR0);

	__raw_writel(0, REG_TCSR1);

	__raw_writel(0, REG_TCSR2);

	__raw_writel(0, REG_TCSR3);

	__raw_writel(0, REG_TCSR4);

	__raw_writel(0x1F, REG_TISR);

	__raw_writel(15000000/(100 * 100), REG_TICR0);

	__raw_writel(0x68000063, REG_TCSR0);

	return ~__raw_readl(REG_TDR1);

}



static void __init w90x900_timer_init(void)

static struct clocksource clocksource_w90p910 = {

	.name	= "w90p910-timer1",

	.rating	= 200,

	.read	= w90p910_get_cycles,

	.mask	= CLOCKSOURCE_MASK(32),

	.shift	= 20,

	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,

};



static void __init w90p910_clocksource_init(unsigned int rate)

{

	w90x900_timer_setup();

	setup_irq(IRQ_TIMER0, &w90x900_timer_irq);

	unsigned int val;



	__raw_writel(0xffffffff, REG_TICR1);



	val = __raw_readl(REG_TCSR1);

	val |= (COUNTEN | PERIOD);

	__raw_writel(val, REG_TCSR1);



	clocksource_w90p910.mult =

		clocksource_khz2mult((rate / 1000), clocksource_w90p910.shift);

	clocksource_register(&clocksource_w90p910);

}



static void __init w90p910_timer_init(void)

{

	struct clk *ck_ext = clk_get(NULL, "ext");

	unsigned int	rate;



	BUG_ON(IS_ERR(ck_ext));



	rate = clk_get_rate(ck_ext);

	clk_put(ck_ext);

	rate = rate / (PRESCALE + 0x01);



	 /* set a known state */

	__raw_writel(0x00, REG_TCSR0);

	__raw_writel(0x00, REG_TCSR1);

	__raw_writel(RESETINT, REG_TISR);

	timer0_load = (rate / TICKS_PER_SEC);



	setup_irq(IRQ_TIMER0, &w90p910_timer0_irq);



	w90p910_clocksource_init(rate);

	w90p910_clockevents_init(rate);

}



struct sys_timer w90x900_timer = {

	.init		= w90x900_timer_init,

	.offset		= w90x900_gettimeoffset,

	.resume		= w90x900_timer_setup

	.init		= w90p910_timer_init,

};

arch/arm/mach-w90x900/w90p910.c

+2 −0
Original line number Diff line number Diff line
@@ -76,6 +76,7 @@ static DEFINE_CLK(wdt, 26); 
static DEFINE_CLK(gdma, 27);

static DEFINE_CLK(adc, 28);

static DEFINE_CLK(usi, 29);

static DEFINE_CLK(ext, 0);



static struct clk_lookup w90p910_clkregs[] = {

	DEF_CLKLOOK(&clk_lcd, "w90p910-lcd", NULL),
@@ -97,6 +98,7 @@ static struct clk_lookup w90p910_clkregs[] = { 
	DEF_CLKLOOK(&clk_gdma, "w90p910-gdma", NULL),

	DEF_CLKLOOK(&clk_adc, "w90p910-adc", NULL),

	DEF_CLKLOOK(&clk_usi, "w90p910-spi", NULL),

	DEF_CLKLOOK(&clk_ext, NULL, "ext"),

};



/* Initial serial platform data */