[ARM] 4488/1: pxa: move pxa25x/pxa27x specific code out of pm.c

1. introduce a structure pxa_cpu_pm_fns for pxa25x/pxa27x specific
   operations as follows:

	struct pxa_cpu_pm_fns {
		int	save_size;
		void	(*save)(unsigned long *);
		void	(*restore)(unsigned long *);
		int	(*valid)(suspend_state_t state);
		void	(*enter)(suspend_state_t state);
	}

2. processor specific registers saving and restoring are performed
   by calling the corresponding (*save) and (*restore)

3. pxa_cpu_pm_fns->save_size should be initialized to the required
   size for processor specific registers saving, the allocated
   memory address will be passed to (*save) and (*restore)

   memory allocation happens early in pxa_pm_init(), and save_size
   should be assigned prior to this (which is usually true, since
   pxa_pm_init() happens in device_initcall()

4. there're some redundancies for those SLEEP_SAVE_XXX and related
   macros, will be fixed later, one way possible is for the system
   devices to handle the specific registers saving and restoring

Signed-off-by: eric miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 80 insertions, 4 deletions

diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c
index 9d9422e2f75c..1ec4bf1ff249 100644
--- a/arch/arm/mach-pxa/pxa25x.c
+++ b/arch/arm/mach-pxa/pxa25x.c
@@ -110,7 +110,75 @@ EXPORT_SYMBOL(get_lcdclk_frequency_10khz);
 
 #ifdef CONFIG_PM
 
-void pxa_cpu_pm_enter(suspend_state_t state)
+#define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
+#define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
+
+#define RESTORE_GPLEVEL(n) do { \
+        GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \
+        GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \
+} while (0)
+
+/*
+ * List of global PXA peripheral registers to preserve.
+ * More ones like CP and general purpose register values are preserved
+ * with the stack pointer in sleep.S.
+ */
+enum {  SLEEP_SAVE_START = 0,
+
+        SLEEP_SAVE_GPLR0, SLEEP_SAVE_GPLR1, SLEEP_SAVE_GPLR2,
+        SLEEP_SAVE_GPDR0, SLEEP_SAVE_GPDR1, SLEEP_SAVE_GPDR2,
+        SLEEP_SAVE_GRER0, SLEEP_SAVE_GRER1, SLEEP_SAVE_GRER2,
+        SLEEP_SAVE_GFER0, SLEEP_SAVE_GFER1, SLEEP_SAVE_GFER2,
+        SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2,
+
+        SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
+        SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
+        SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
+
+        SLEEP_SAVE_PSTR,
+
+        SLEEP_SAVE_ICMR,
+        SLEEP_SAVE_CKEN,
+
+        SLEEP_SAVE_SIZE
+};
+
+
+static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
+{
+        SAVE(GPLR0); SAVE(GPLR1); SAVE(GPLR2);
+        SAVE(GPDR0); SAVE(GPDR1); SAVE(GPDR2);
+        SAVE(GRER0); SAVE(GRER1); SAVE(GRER2);
+        SAVE(GFER0); SAVE(GFER1); SAVE(GFER2);
+        SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
+
+        SAVE(GAFR0_L); SAVE(GAFR0_U);
+        SAVE(GAFR1_L); SAVE(GAFR1_U);
+        SAVE(GAFR2_L); SAVE(GAFR2_U);
+
+        SAVE(ICMR);
+        SAVE(CKEN);
+        SAVE(PSTR);
+}
+
+static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
+{
+        /* restore registers */
+        RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
+        RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2);
+        RESTORE(GAFR0_L); RESTORE(GAFR0_U);
+        RESTORE(GAFR1_L); RESTORE(GAFR1_U);
+        RESTORE(GAFR2_L); RESTORE(GAFR2_U);
+        RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2);
+        RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2);
+        RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
+
+        RESTORE(CKEN);
+        RESTORE(ICMR);
+        RESTORE(PSTR);
+}
+
+static void pxa25x_cpu_pm_enter(suspend_state_t state)
 {
         extern void pxa_cpu_suspend(unsigned int);
         extern void pxa_cpu_resume(void);
@@ -126,10 +194,18 @@ void pxa_cpu_pm_enter(suspend_state_t state)
         }
 }
 
-static struct pm_ops pxa25x_pm_ops = {
-        .enter          = pxa_pm_enter,
+static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
+        .save_size      = SLEEP_SAVE_SIZE,
         .valid          = pm_valid_only_mem,
+        .save           = pxa25x_cpu_pm_save,
+        .restore        = pxa25x_cpu_pm_restore,
+        .enter          = pxa25x_cpu_pm_enter,
 };
+
+static void __init pxa25x_init_pm(void)
+{
+        pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
+}
 #endif
 
 void __init pxa25x_init_irq(void)
@@ -159,7 +235,7 @@ static int __init pxa25x_init(void)
                 if ((ret = pxa_init_dma(16)))
                         return ret;
 #ifdef CONFIG_PM
-                pm_set_ops(&pxa25x_pm_ops);
+                pxa25x_init_pm();
 #endif
                 ret = platform_add_devices(pxa25x_devices,
                                            ARRAY_SIZE(pxa25x_devices));