[POWERPC] Add restart support for mpc52xx based platforms
Add common helper routines: mpc52xx_map_wdt() and mpc52xx_restart(). Signed-off-by: Marian Balakowicz <m8@semihalf.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
parent
d24bc314c9
commit
86b92cdda9
2 changed files with 53 additions and 0 deletions
|
@ -18,6 +18,13 @@
|
|||
#include <asm/prom.h>
|
||||
#include <asm/mpc52xx.h>
|
||||
|
||||
/*
|
||||
* This variable is mapped in mpc52xx_map_wdt() and used in mpc52xx_restart().
|
||||
* Permanent mapping is required because mpc52xx_restart() can be called
|
||||
* from interrupt context while node mapping (which calls ioremap())
|
||||
* cannot be used at such point.
|
||||
*/
|
||||
static volatile struct mpc52xx_gpt *mpc52xx_wdt = NULL;
|
||||
|
||||
static void __iomem *
|
||||
mpc52xx_map_node(struct device_node *ofn)
|
||||
|
@ -126,3 +133,46 @@ mpc52xx_declare_of_platform_devices(void)
|
|||
"Error while probing of_platform bus\n");
|
||||
}
|
||||
|
||||
void __init
|
||||
mpc52xx_map_wdt(void)
|
||||
{
|
||||
const void *has_wdt;
|
||||
struct device_node *np;
|
||||
|
||||
/* mpc52xx_wdt is mapped here and used in mpc52xx_restart,
|
||||
* possibly from a interrupt context. wdt is only implement
|
||||
* on a gpt0, so check has-wdt property before mapping.
|
||||
*/
|
||||
for_each_compatible_node(np, NULL, "fsl,mpc5200-gpt") {
|
||||
has_wdt = of_get_property(np, "fsl,has-wdt", NULL);
|
||||
if (has_wdt) {
|
||||
mpc52xx_wdt = mpc52xx_map_node(np);
|
||||
return;
|
||||
}
|
||||
}
|
||||
for_each_compatible_node(np, NULL, "mpc5200-gpt") {
|
||||
has_wdt = of_get_property(np, "has-wdt", NULL);
|
||||
if (has_wdt) {
|
||||
mpc52xx_wdt = mpc52xx_map_node(np);
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
mpc52xx_restart(char *cmd)
|
||||
{
|
||||
local_irq_disable();
|
||||
|
||||
/* Turn on the watchdog and wait for it to expire.
|
||||
* It effectively does a reset. */
|
||||
if (mpc52xx_wdt) {
|
||||
out_be32(&mpc52xx_wdt->mode, 0x00000000);
|
||||
out_be32(&mpc52xx_wdt->count, 0x000000ff);
|
||||
out_be32(&mpc52xx_wdt->mode, 0x00009004);
|
||||
} else
|
||||
printk("mpc52xx_restart: Can't access wdt. "
|
||||
"Restart impossible, system halted.\n");
|
||||
|
||||
while (1);
|
||||
}
|
||||
|
|
|
@ -259,6 +259,9 @@ extern unsigned int mpc52xx_get_irq(void);
|
|||
|
||||
extern int __init mpc52xx_add_bridge(struct device_node *node);
|
||||
|
||||
extern void __init mpc52xx_map_wdt(void);
|
||||
extern void mpc52xx_restart(char *cmd);
|
||||
|
||||
#endif /* __ASSEMBLY__ */
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
|
|
Reference in a new issue