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microblaze: Fix the heartbeat gpio to be more robust

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The device tree handling for the gpio in the heart beat was not handling
the system when there was no gpio and it wasn't working with a newer version
of the gpio core which does not have the is-bidir property.

Signed-off-by: John Linn <john.linn@xilinx.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
John Linn 2009-06-05 11:36:31 -06:00 committed by Michal Simek
parent 95dfbbe470
commit 6d858535be
1 changed files with 10 additions and 5 deletions
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9
arch/microblaze/kernel/heartbeat.c
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@ -45,6 +45,7 @@ void heartbeat(void)
void setup_heartbeat(void)
{
struct device_node *gpio = NULL;
int *prop;
int j;
char *gpio_list[] = {
"xlnx,xps-gpio-1.00.a",
@ -58,10 +59,14 @@ void setup_heartbeat(void)
break;
}
if (gpio) {
base_addr = *(int *) of_get_property(gpio, "reg", NULL);
base_addr = (unsigned long) ioremap(base_addr, PAGE_SIZE);
printk(KERN_NOTICE "Heartbeat GPIO at 0x%x\n", base_addr);
if (*(int *) of_get_property(gpio, "xlnx,is-bidir", NULL))
out_be32(base_addr + 4, 0); /* GPIO is configured as output */
/* GPIO is configured as output */
prop = (int *) of_get_property(gpio, "xlnx,is-bidir", NULL);
if (prop)
out_be32(base_addr + 4, 0);
}
}