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[ARM] 4488/1: pxa: move pxa25x/pxa27x specific code out of pm.c
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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>
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Eric Miao authored and Russell King committed Jul 20, 2007
1 parent e09d02e commit 711be5c
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Showing 4 changed files with 244 additions and 137 deletions.
169 changes: 44 additions & 125 deletions arch/arm/mach-pxa/pm.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -24,162 +24,49 @@
#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 **/
if (elf_hwcap & HWCAP_IWMMXT)
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;
}
Expand All @@ -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);
84 changes: 80 additions & 4 deletions arch/arm/mach-pxa/pxa25x.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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);
Expand All @@ -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)
Expand Down Expand Up @@ -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));
Expand Down
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