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

Add sh7724 code to save and restore CPG state during
R-standby. Only CPG registers IRDACLKCR and SPUCLKCR
require software save and restore.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh4a/setup-sh7724.c

@@ -941,6 +941,9 @@ static struct {
 	/* RWDT */
 	unsigned short rwtcnt;
 	unsigned short rwtcsr;
+	/* CPG */
+	unsigned long irdaclk;
+	unsigned long spuclk;
 } sh7724_rstandby_state;
 
 static int sh7724_pre_sleep_notifier_call(struct notifier_block *nb,
@@ -998,6 +1001,10 @@ static int sh7724_pre_sleep_notifier_call(struct notifier_block *nb,
 	sh7724_rstandby_state.rwtcsr |= 0xa500;
 	__raw_writew(sh7724_rstandby_state.rwtcsr & 0x07, 0xa4520004);
 
+	/* CPG */
+	sh7724_rstandby_state.irdaclk = __raw_readl(0xa4150018); /* IRDACLKCR */
+	sh7724_rstandby_state.spuclk = __raw_readl(0xa415003c); /* SPUCLKCR */
+
 	return NOTIFY_DONE;
 }
 
@@ -1052,6 +1059,10 @@ static int sh7724_post_sleep_notifier_call(struct notifier_block *nb,
 	__raw_writew(sh7724_rstandby_state.rwtcnt, 0xa4520000); /* RWTCNT */
 	__raw_writew(sh7724_rstandby_state.rwtcsr, 0xa4520004); /* RWTCSR */
 
+	/* CPG */
+	__raw_writel(sh7724_rstandby_state.irdaclk, 0xa4150018); /* IRDACLKCR */
+	__raw_writel(sh7724_rstandby_state.spuclk, 0xa415003c); /* SPUCLKCR */
+
 	return NOTIFY_DONE;
 }