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OMAP2+: clocksource: fix crash on boot when !CONFIG_OMAP_32K_TIMER

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OMAP2+ kernels built without CONFIG_OMAP_32K_TIMER crash on boot after the
2.6.38 sched_clock changes:

[    0.000000] OMAP clockevent source: GPTIMER1 at 13000000 Hz
[    0.000000] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[    0.000000] pgd = c0004000
[    0.000000] [00000000] *pgd=00000000
[    0.000000] Internal error: Oops: 80000005 [#1] SMP
[    0.000000] last sysfs file:
[    0.000000] Modules linked in:
[    0.000000] CPU: 0    Not tainted  (2.6.38-rc5-00057-g04aa67d #152)
[    0.000000] PC is at 0x0
[    0.000000] LR is at sched_clock_poll+0x2c/0x3c

Without CONFIG_OMAP_32K_TIMER, the kernel has an clockevent and
clocksource resolution about three orders of magnitude higher than
with CONFIG_OMAP_32K_TIMER set.  The tradeoff is that the lowest
power consumption states are not available.

Fix by calling init_sched_clock() from the GPTIMER clocksource init code.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Paul Walmsley 2011-02-22 19:59:49 -07:00 committed by Tony Lindgren
parent c03773206b
commit cbc9438075
1 changed files with 13 additions and 0 deletions
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13
arch/arm/mach-omap2/timer-gp.c
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@ -39,6 +39,7 @@
#include <asm/mach/time.h>
#include <plat/dmtimer.h>
#include <asm/localtimer.h>
#include <asm/sched_clock.h>
#include "timer-gp.h"
@ -190,6 +191,7 @@ static void __init omap2_gp_clocksource_init(void)
/*
* clocksource
*/
static DEFINE_CLOCK_DATA(cd);
static struct omap_dm_timer *gpt_clocksource;
static cycle_t clocksource_read_cycles(struct clocksource *cs)
{
@ -204,6 +206,15 @@ static struct clocksource clocksource_gpt = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void notrace dmtimer_update_sched_clock(void)
{
u32 cyc;
cyc = omap_dm_timer_read_counter(gpt_clocksource);
update_sched_clock(&cd, cyc, (u32)~0);
}
/* Setup free-running counter for clocksource */
static void __init omap2_gp_clocksource_init(void)
{
@ -224,6 +235,8 @@ static void __init omap2_gp_clocksource_init(void)
omap_dm_timer_set_load_start(gpt, 1, 0);
init_sched_clock(&cd, dmtimer_update_sched_clock, 32, tick_rate);
if (clocksource_register_hz(&clocksource_gpt, tick_rate))
printk(err2, clocksource_gpt.name);
}