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| author | Magnus Damm <damm@opensource.se> | 2009-11-02 09:31:03 +0000 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-11-04 11:48:05 +0900 |
| commit | c4b973f532206e1a67b1beae654b44c8be26fc44 (patch) | |
| tree | e806f8dddc943bc22b5e6d52f8403ed58e902d34 | |
| parent | a37c6c7aec38a693f87ee5ccc6e60a5b3ee700f2 (diff) | |
| download | linux-3.10-c4b973f532206e1a67b1beae654b44c8be26fc44.tar.gz linux-3.10-c4b973f532206e1a67b1beae654b44c8be26fc44.tar.bz2 linux-3.10-c4b973f532206e1a67b1beae654b44c8be26fc44.zip | |
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>
| -rw-r--r-- | arch/sh/kernel/cpu/sh4a/setup-sh7724.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7724.c b/arch/sh/kernel/cpu/sh4a/setup-sh7724.c index 6dc4469434e..ac1505a8fd8 100644 --- a/arch/sh/kernel/cpu/sh4a/setup-sh7724.c +++ b/arch/sh/kernel/cpu/sh4a/setup-sh7724.c @@ -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; } |