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>
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@ -870,6 +870,9 @@ static struct {
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unsigned char imr10;
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unsigned char imr11;
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unsigned char imr12;
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/* RWDT */
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unsigned short rwtcnt;
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unsigned short rwtcsr;
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} sh7724_rstandby_state;
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static int sh7724_pre_sleep_notifier_call(struct notifier_block *nb,
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@ -920,6 +923,13 @@ static int sh7724_pre_sleep_notifier_call(struct notifier_block *nb,
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sh7724_rstandby_state.imr11 = __raw_readb(0xa40800ac); /* IMR11 */
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sh7724_rstandby_state.imr12 = __raw_readb(0xa40800b0); /* IMR12 */
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/* RWDT */
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sh7724_rstandby_state.rwtcnt = __raw_readb(0xa4520000); /* RWTCNT */
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sh7724_rstandby_state.rwtcnt |= 0x5a00;
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sh7724_rstandby_state.rwtcsr = __raw_readb(0xa4520004); /* RWTCSR */
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sh7724_rstandby_state.rwtcsr |= 0xa500;
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__raw_writew(sh7724_rstandby_state.rwtcsr & 0x07, 0xa4520004);
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return NOTIFY_DONE;
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}
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@ -970,6 +980,10 @@ static int sh7724_post_sleep_notifier_call(struct notifier_block *nb,
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__raw_writeb(sh7724_rstandby_state.imr11, 0xa40800ac); /* IMR11 */
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__raw_writeb(sh7724_rstandby_state.imr12, 0xa40800b0); /* IMR12 */
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/* RWDT */
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__raw_writew(sh7724_rstandby_state.rwtcnt, 0xa4520000); /* RWTCNT */
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__raw_writew(sh7724_rstandby_state.rwtcsr, 0xa4520004); /* RWTCSR */
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return NOTIFY_DONE;
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}
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