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Commit 86b92cdd authored by Marian Balakowicz's avatar Marian Balakowicz Committed by Grant Likely
Browse files

[POWERPC] Add restart support for mpc52xx based platforms 



Add common helper routines: mpc52xx_map_wdt() and mpc52xx_restart().

Signed-off-by: default avatarMarian Balakowicz <m8@semihalf.com>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent d24bc314

arch/powerpc/platforms/52xx/mpc52xx_common.c

+50 −0
Original line number Diff line number Diff line
@@ -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);

}

include/asm-powerpc/mpc52xx.h

+3 −0
Original line number Diff line number Diff line
@@ -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