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
Russell King
parent
ae45b1c618
commit
58b5369e6e
@ -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.
|
||||
|
||||
@ -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;
|
||||
|
||||
@ -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,
|
||||
};
|
||||
|
||||
@ -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 */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user