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sh: Add RWDT save/restore code for sh7724 R-standby 

Add sh7724 code to save and restore RWDT state during
R-standby. Without this patch the watchdog will generate
a reset shortly after resuming from R-standby.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2009-11-02 09:31:03 +00:00 committed by Paul Mundt
parent a37c6c7aec
commit c4b973f532
1 changed files with 14 additions and 0 deletions
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14
arch/sh/kernel/cpu/sh4a/setup-sh7724.c
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@ -870,6 +870,9 @@ static struct {
unsigned char imr10;
unsigned char imr11;
unsigned char imr12;
/* RWDT */
unsigned short rwtcnt;
unsigned short rwtcsr;
} sh7724_rstandby_state;
static int sh7724_pre_sleep_notifier_call(struct notifier_block *nb,
@ -920,6 +923,13 @@ static int sh7724_pre_sleep_notifier_call(struct notifier_block *nb,
sh7724_rstandby_state.imr11 = __raw_readb(0xa40800ac); /* IMR11 */
sh7724_rstandby_state.imr12 = __raw_readb(0xa40800b0); /* IMR12 */
/* RWDT */
sh7724_rstandby_state.rwtcnt = __raw_readb(0xa4520000); /* RWTCNT */
sh7724_rstandby_state.rwtcnt |= 0x5a00;
sh7724_rstandby_state.rwtcsr = __raw_readb(0xa4520004); /* RWTCSR */
sh7724_rstandby_state.rwtcsr |= 0xa500;
__raw_writew(sh7724_rstandby_state.rwtcsr & 0x07, 0xa4520004);
return NOTIFY_DONE;
}
@ -970,6 +980,10 @@ static int sh7724_post_sleep_notifier_call(struct notifier_block *nb,
__raw_writeb(sh7724_rstandby_state.imr11, 0xa40800ac); /* IMR11 */
__raw_writeb(sh7724_rstandby_state.imr12, 0xa40800b0); /* IMR12 */
/* RWDT */
__raw_writew(sh7724_rstandby_state.rwtcnt, 0xa4520000); /* RWTCNT */
__raw_writew(sh7724_rstandby_state.rwtcsr, 0xa4520004); /* RWTCSR */
return NOTIFY_DONE;
}