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microblaze: Fix the heartbeat gpio to be more robust 

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the system when there was no gpio and it wasn't working with a newer version
of the gpio core which does not have the is-bidir property.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>
hifive-unleashed-5.1
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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15
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;
}
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 (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);
}
}