OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[ARM] 4812/1: RealView: clockevents support for the RealView platforms 

The patch updates the RealView code to the clockevents infrastructure.
The SMP support is implemented in subsequent patches. Based on the
Versatile implementation by Kevin Hilman.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2008-02-04 17:26:55 +01:00 committed by Russell King
parent 85802afeb0
commit ae30ceac3c
2 changed files with 67 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/Kconfig
View File

@ -169,6 +169,7 @@ config ARCH_REALVIEW
select ARM_AMBA
select ICST307
select GENERIC_TIME
select GENERIC_CLOCKEVENTS
help
This enables support for ARM Ltd RealView boards.

78
arch/arm/mach-realview/core.c
View File

@ -26,6 +26,7 @@
#include <linux/amba/bus.h>
#include <linux/amba/clcd.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <asm/system.h>
#include <asm/hardware.h>
@ -485,20 +486,77 @@ void realview_leds_event(led_event_t ledevt)
#define TICKS2USECS(x) ((x) / TICKS_PER_uSEC)
#endif
static void timer_set_mode(enum clock_event_mode mode,
struct clock_event_device *clk)
{
unsigned long ctrl;
switch(mode) {
case CLOCK_EVT_MODE_PERIODIC:
writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD);
ctrl = TIMER_CTRL_PERIODIC;
ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE | TIMER_CTRL_ENABLE;
break;
case CLOCK_EVT_MODE_ONESHOT:
/* period set, and timer enabled in 'next_event' hook */
ctrl = TIMER_CTRL_ONESHOT;
ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE;
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
default:
ctrl = 0;
}
writel(ctrl, TIMER0_VA_BASE + TIMER_CTRL);
}
static int timer_set_next_event(unsigned long evt,
struct clock_event_device *unused)
{
unsigned long ctrl = readl(TIMER0_VA_BASE + TIMER_CTRL);
writel(evt, TIMER0_VA_BASE + TIMER_LOAD);
writel(ctrl | TIMER_CTRL_ENABLE, TIMER0_VA_BASE + TIMER_CTRL);
return 0;
}
static struct clock_event_device timer0_clockevent = {
.name = "timer0",
.shift = 32,
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.set_mode = timer_set_mode,
.set_next_event = timer_set_next_event,
.rating = 300,
.irq = IRQ_TIMERINT0_1,
.cpumask = CPU_MASK_ALL,
};
static void __init realview_clockevents_init(void)
{
timer0_clockevent.mult =
div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
timer0_clockevent.max_delta_ns =
clockevent_delta2ns(0xffffffff, &timer0_clockevent);
timer0_clockevent.min_delta_ns =
clockevent_delta2ns(0xf, &timer0_clockevent);
clockevents_register_device(&timer0_clockevent);
}
/*
* IRQ handler for the timer
*/
static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
{
// ...clear the interrupt
struct clock_event_device *evt = &timer0_clockevent;
/* clear the interrupt */
writel(1, TIMER0_VA_BASE + TIMER_INTCLR);
timer_tick();
#if defined(CONFIG_SMP) && !defined(CONFIG_LOCAL_TIMERS)
smp_send_timer();
update_process_times(user_mode(get_irq_regs()));
#endif
evt->event_handler(evt);
return IRQ_HANDLED;
}
@ -564,17 +622,13 @@ static void __init realview_timer_init(void)
writel(0, TIMER2_VA_BASE + TIMER_CTRL);
writel(0, TIMER3_VA_BASE + TIMER_CTRL);
writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD);
writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_VALUE);
writel(TIMER_DIVISOR | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC |
TIMER_CTRL_IE, TIMER0_VA_BASE + TIMER_CTRL);
/*
* Make irqs happen for the system timer
*/
setup_irq(IRQ_TIMERINT0_1, &realview_timer_irq);
realview_clocksource_init();
realview_clockevents_init();
}
struct sys_timer realview_timer = {