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

Add clocksource/clockevent support for w90p910 platform.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
wanzongshun 2009-08-14 15:36:44 +01:00 committed by Russell King
parent ae45b1c618
commit 58b5369e6e
4 changed files with 138 additions and 25 deletions

View file

@ -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.

View file

@ -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;

View file

@ -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 w90x900_timer_setup(void)
static void __init w90p910_clockevents_init(unsigned int rate)
{
__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);
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);
clockevents_register_device(&w90p910_clockevent_device);
}
static void __init w90x900_timer_init(void)
static cycle_t w90p910_get_cycles(struct clocksource *cs)
{
w90x900_timer_setup();
setup_irq(IRQ_TIMER0, &w90x900_timer_irq);
return ~__raw_readl(REG_TDR1);
}
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)
{
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,
};

View file

@ -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 */