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nios2: check number of timer instances

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Display error message if number of timers is less than 2.

Signed-off-by: Ley Foon Tan <lftan@altera.com>
This commit is contained in:
Ley Foon Tan 2015-06-24 17:52:44 +08:00
parent b953c0d234
commit a8955cc3a5
1 changed files with 13 additions and 2 deletions
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13
arch/nios2/kernel/time.c
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@ -18,6 +18,8 @@
#include <linux/io.h> #include <linux/io.h>
#include <linux/slab.h> #include <linux/slab.h>
#define ALTR_TIMER_COMPATIBLE "altr,timer-1.0"
#define ALTERA_TIMER_STATUS_REG 0 #define ALTERA_TIMER_STATUS_REG 0
#define ALTERA_TIMER_CONTROL_REG 4 #define ALTERA_TIMER_CONTROL_REG 4
#define ALTERA_TIMER_PERIODL_REG 8 #define ALTERA_TIMER_PERIODL_REG 8
@ -302,7 +304,16 @@ void read_persistent_clock(struct timespec *ts)
void __init time_init(void) void __init time_init(void)
{ {
struct device_node *np;
int count = 0;
for_each_compatible_node(np, NULL, ALTR_TIMER_COMPATIBLE)
count++;
if (count < 2)
panic("%d timer is found, it needs 2 timers in system\n", count);
clocksource_of_init(); clocksource_of_init();
} }
CLOCKSOURCE_OF_DECLARE(nios2_timer, "altr,timer-1.0", nios2_time_init); CLOCKSOURCE_OF_DECLARE(nios2_timer, ALTR_TIMER_COMPATIBLE, nios2_time_init);