lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[ARM] 4262/1: OMAP: clocksource and clockevent support

Browse Source 
Update OMAP1 to enable support for hrtimers and dynticks by using new clocksource and clockevent infrastructure.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Kevin Hilman
2007-03-08 20:32:19 +01:00
committed by Russell King
parent 89df127246
commit 075192ae80
5 changed files with 227 additions and 176 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
arch/arm/plat-omap/common.c
View File

@@ -156,3 +156,53 @@ static int __init omap_add_serial_console(void)
return add_preferred_console("ttyS", line, opt);
}
console_initcall(omap_add_serial_console);
/*
* 32KHz clocksource ... always available, on pretty most chips except
* OMAP 730 and 1510. Other timers could be used as clocksources, with
* higher resolution in free-running counter modes (e.g. 12 MHz xtal),
* but systems won't necessarily want to spend resources that way.
*/
#if defined(CONFIG_ARCH_OMAP16XX)
#define TIMER_32K_SYNCHRONIZED 0xfffbc410
#elif defined(CONFIG_ARCH_OMAP24XX)
#define TIMER_32K_SYNCHRONIZED 0x48004010
#endif
#ifdef TIMER_32K_SYNCHRONIZED
#include <linux/clocksource.h>
static cycle_t omap_32k_read(void)
{
return omap_readl(TIMER_32K_SYNCHRONIZED);
}
static struct clocksource clocksource_32k = {
.name = "32k_counter",
.rating = 250,
.read = omap_32k_read,
.mask = CLOCKSOURCE_MASK(32),
.shift = 10,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static int __init omap_init_clocksource_32k(void)
{
static char err[] __initdata = KERN_ERR
"%s: can't register clocksource!\n";
if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
clocksource_32k.mult = clocksource_hz2mult(32768,
clocksource_32k.shift);
if (clocksource_register(&clocksource_32k))
printk(err, clocksource_32k.name);
}
return 0;
}
arch_initcall(omap_init_clocksource_32k);
#endif /* TIMER_32K_SYNCHRONIZED */