ARM: pxa: introduce pxa2xx_clock_sysclass for clock suspend/resume

Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

arch/arm/mach-pxa/clock-pxa2xx.c

@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/sysdev.h>
 
 #include <mach/pxa2xx-regs.h>
 
@@ -28,3 +29,28 @@ const struct clkops clk_pxa2xx_cken_ops = {
 	.enable		= clk_pxa2xx_cken_enable,
 	.disable	= clk_pxa2xx_cken_disable,
 };
+
+#ifdef CONFIG_PM
+static uint32_t saved_cken;
+
+static int pxa2xx_clock_suspend(struct sys_device *d, pm_message_t state)
+{
+	saved_cken = CKEN;
+	return 0;
+}
+
+static int pxa2xx_clock_resume(struct sys_device *d)
+{
+	CKEN = saved_cken;
+	return 0;
+}
+#else
+#define pxa2xx_clock_suspend	NULL
+#define pxa2xx_clock_resume	NULL
+#endif
+
+struct sysdev_class pxa2xx_clock_sysclass = {
+	.name		= "pxa2xx-clock",
+	.suspend	= pxa2xx_clock_suspend,
+	.resume		= pxa2xx_clock_resume,
+};

arch/arm/mach-pxa/clock.h

+#include <linux/sysdev.h>
 #include <asm/clkdev.h>
 
 struct clkops {
@@ -53,6 +54,8 @@ extern const struct clkops clk_pxa2xx_cken_ops;
 void clk_pxa2xx_cken_enable(struct clk *clk);
 void clk_pxa2xx_cken_disable(struct clk *clk);
 
+extern struct sysdev_class pxa2xx_clock_sysclass;
+
 #ifdef CONFIG_PXA3xx
 #define DEFINE_PXA3_CKEN(_name, _cken, _rate, _delay)	\
 struct clk clk_##_name = {				\

arch/arm/mach-pxa/pxa25x.c

@@ -222,20 +222,17 @@ static struct clk_lookup pxa25x_hwuart_clkreg =
  */
 enum {
 	SLEEP_SAVE_PSTR,
-	SLEEP_SAVE_CKEN,
 	SLEEP_SAVE_COUNT
 };
 
 
 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
 {
-	SAVE(CKEN);
 	SAVE(PSTR);
 }
 
 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
 {
-	RESTORE(CKEN);
 	RESTORE(PSTR);
 }
 
@@ -358,7 +355,9 @@ static struct sys_device pxa25x_sysdev[] = {
 		.cls	= &pxa2xx_mfp_sysclass,
 	}, {
 		.cls	= &pxa_gpio_sysclass,
-	},
+	}, {
+		.cls	= &pxa2xx_clock_sysclass,
+	}
 };
 
 static int __init pxa25x_init(void)

arch/arm/mach-pxa/pxa27x.c

@@ -258,7 +258,6 @@ int __init pxa27x_set_pwrmode(unsigned int mode)
  */
 enum {
 	SLEEP_SAVE_PSTR,
-	SLEEP_SAVE_CKEN,
 	SLEEP_SAVE_MDREFR,
 	SLEEP_SAVE_PCFR,
 	SLEEP_SAVE_COUNT
@@ -269,7 +268,6 @@ void pxa27x_cpu_pm_save(unsigned long *sleep_save)
 	sleep_save[SLEEP_SAVE_MDREFR] = __raw_readl(MDREFR);
 	SAVE(PCFR);
 
-	SAVE(CKEN);
 	SAVE(PSTR);
 }
 
@@ -280,7 +278,6 @@ void pxa27x_cpu_pm_restore(unsigned long *sleep_save)
 
 	PSSR = PSSR_RDH | PSSR_PH;
 
-	RESTORE(CKEN);
 	RESTORE(PSTR);
 }
 
@@ -438,7 +435,9 @@ static struct sys_device pxa27x_sysdev[] = {
 		.cls	= &pxa2xx_mfp_sysclass,
 	}, {
 		.cls	= &pxa_gpio_sysclass,
-	},
+	}, {
+		.cls	= &pxa2xx_clock_sysclass,
+	}
 };
 
 static int __init pxa27x_init(void)