[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, 44 insertions, 125 deletions

diff --git a/arch/arm/mach-pxa/pm.c b/arch/arm/mach-pxa/pm.c
index e66dbc26add1..b59a81a8e7d3 100644
--- a/arch/arm/mach-pxa/pm.c
+++ b/arch/arm/mach-pxa/pm.c
@@ -24,61 +24,13 @@
 #include <asm/arch/lubbock.h>
 #include <asm/mach/time.h>
 
-
-/*
- * Debug macros
- */
-#undef DEBUG
-
-#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_GPLR3,
-        SLEEP_SAVE_GPDR0, SLEEP_SAVE_GPDR1, SLEEP_SAVE_GPDR2, SLEEP_SAVE_GPDR3,
-        SLEEP_SAVE_GRER0, SLEEP_SAVE_GRER1, SLEEP_SAVE_GRER2, SLEEP_SAVE_GRER3,
-        SLEEP_SAVE_GFER0, SLEEP_SAVE_GFER1, SLEEP_SAVE_GFER2, SLEEP_SAVE_GFER3,
-        SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2, SLEEP_SAVE_PGSR3,
-
-        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_GAFR3_L, SLEEP_SAVE_GAFR3_U,
-
-        SLEEP_SAVE_PSTR,
-
-        SLEEP_SAVE_ICMR,
-        SLEEP_SAVE_CKEN,
-
-#ifdef CONFIG_PXA27x
-        SLEEP_SAVE_MDREFR,
-        SLEEP_SAVE_PWER, SLEEP_SAVE_PCFR, SLEEP_SAVE_PRER,
-        SLEEP_SAVE_PFER, SLEEP_SAVE_PKWR,
-#endif
-
-        SLEEP_SAVE_CKSUM,
-
-        SLEEP_SAVE_SIZE
-};
-
+struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
+static unsigned long *sleep_save;
 
 int pxa_pm_enter(suspend_state_t state)
 {
-        unsigned long sleep_save[SLEEP_SAVE_SIZE];
-        unsigned long checksum = 0;
+        unsigned long sleep_save_checksum = 0, checksum = 0;
         int i;
-        extern void pxa_cpu_pm_enter(suspend_state_t state);
 
 #ifdef CONFIG_IWMMXT
         /* force any iWMMXt context to ram **/
@@ -86,100 +38,35 @@ int pxa_pm_enter(suspend_state_t state)
                 iwmmxt_task_disable(NULL);
 #endif
 
-        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);
-
-#ifdef CONFIG_PXA27x
-        SAVE(MDREFR);
-        SAVE(GPLR3); SAVE(GPDR3); SAVE(GRER3); SAVE(GFER3); SAVE(PGSR3);
-        SAVE(GAFR3_L); SAVE(GAFR3_U);
-        SAVE(PWER); SAVE(PCFR); SAVE(PRER);
-        SAVE(PFER); SAVE(PKWR);
-#endif
-
-        SAVE(ICMR);
-        ICMR = 0;
-
-        SAVE(CKEN);
-        SAVE(PSTR);
-
-        /* Note: wake up source are set up in each machine specific files */
-
-        /* clear GPIO transition detect  bits */
-        GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
-#ifdef CONFIG_PXA27x
-        GEDR3 = GEDR3;
-#endif
+        pxa_cpu_pm_fns->save(sleep_save);
 
         /* Clear sleep reset status */
         RCSR = RCSR_SMR;
 
         /* before sleeping, calculate and save a checksum */
-        for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
-                checksum += sleep_save[i];
-        sleep_save[SLEEP_SAVE_CKSUM] = checksum;
+        for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
+                sleep_save_checksum += sleep_save[i];
 
         /* *** go zzz *** */
-        pxa_cpu_pm_enter(state);
-
+        pxa_cpu_pm_fns->enter(state);
         cpu_init();
 
         /* after sleeping, validate the checksum */
-        checksum = 0;
-        for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
+        for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++)
                 checksum += sleep_save[i];
 
         /* if invalid, display message and wait for a hardware reset */
-        if (checksum != sleep_save[SLEEP_SAVE_CKSUM]) {
+        if (checksum != sleep_save_checksum) {
 #ifdef CONFIG_ARCH_LUBBOCK
                 LUB_HEXLED = 0xbadbadc5;
 #endif
                 while (1)
-                        pxa_cpu_pm_enter(state);
+                        pxa_cpu_pm_fns->enter(state);
         }
 
-        /* ensure not to come back here if it wasn't intended */
-        PSPR = 0;
-
-        /* 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);
-
-#ifdef CONFIG_PXA27x
-        RESTORE(MDREFR);
-        RESTORE_GPLEVEL(3); RESTORE(GPDR3);
-        RESTORE(GAFR3_L); RESTORE(GAFR3_U);
-        RESTORE(GRER3); RESTORE(GFER3); RESTORE(PGSR3);
-        RESTORE(PWER); RESTORE(PCFR); RESTORE(PRER);
-        RESTORE(PFER); RESTORE(PKWR);
-#endif
-
-        PSSR = PSSR_RDH | PSSR_PH;
-
-        RESTORE(CKEN);
-
-        ICLR = 0;
-        ICCR = 1;
-        RESTORE(ICMR);
+        pxa_cpu_pm_fns->restore(sleep_save);
 
-        RESTORE(PSTR);
-
-#ifdef DEBUG
-        printk(KERN_DEBUG "*** made it back from resume\n");
-#endif
+        pr_debug("*** made it back from resume\n");
 
         return 0;
 }
@@ -190,3 +77,35 @@ unsigned long sleep_phys_sp(void *sp)
 {
         return virt_to_phys(sp);
 }
+
+static int pxa_pm_valid(suspend_state_t state)
+{
+        if (pxa_cpu_pm_fns)
+                return pxa_cpu_pm_fns->valid(state);
+
+        return -EINVAL;
+}
+
+static struct pm_ops pxa_pm_ops = {
+        .valid          = pxa_pm_valid,
+        .enter          = pxa_pm_enter,
+};
+
+static int __init pxa_pm_init(void)
+{
+        if (!pxa_cpu_pm_fns) {
+                printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
+                return -EINVAL;
+        }
+
+        sleep_save = kmalloc(pxa_cpu_pm_fns->save_size, GFP_KERNEL);
+        if (!sleep_save) {
+                printk(KERN_ERR "failed to alloc memory for pm save\n");
+                return -ENOMEM;
+        }
+
+        pm_set_ops(&pxa_pm_ops);
+        return 0;
+}
+
+device_initcall(pxa_pm_init);