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/*
* PXA250/210 Power Management Routines
*
* Original code for the SA11x0:
* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
*
* Modified for the PXA250 by Nicolas Pitre:
* Copyright (c) 2002 Monta Vista Software, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License.
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <asm/hardware.h>
#include <asm/memory.h>
#include <asm/system.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/lubbock.h>
#include <asm/mach/time.h>
/*
* Debug macros
*/
#undef DEBUG
extern void pxa_cpu_suspend(void);
extern void pxa_cpu_resume(void);
#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,
SLEEP_SAVE_CKSUM,
SLEEP_SAVE_SIZE
};
static int pxa_pm_enter(suspend_state_t state)
{
unsigned long sleep_save[SLEEP_SAVE_SIZE];
unsigned long checksum = 0;
struct timespec delta, rtc;
int i;
if (state != PM_SUSPEND_MEM)
return -EINVAL;
#ifdef CONFIG_IWMMXT
/* force any iWMMXt context to ram **/
iwmmxt_task_disable(NULL);
#endif
/* preserve current time */
rtc.tv_sec = RCNR;
rtc.tv_nsec = 0;
save_time_delta(&delta, &rtc);
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(GPLR3); SAVE(GPDR3); SAVE(GRER3); SAVE(GFER3); SAVE(PGSR3);
SAVE(GAFR3_L); SAVE(GAFR3_U);
#endif
SAVE(ICMR);
ICMR = 0;
SAVE(CKEN);
CKEN = 0;
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
/* Clear sleep reset status */
RCSR = RCSR_SMR;
/* set resume return address */
PSPR = virt_to_phys(pxa_cpu_resume);
/* 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;
/* *** go zzz *** */
pxa_cpu_suspend();
/* after sleeping, validate the checksum */
checksum = 0;
for (i = 0; i < SLEEP_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]) {
#ifdef CONFIG_ARCH_LUBBOCK
LUB_HEXLED = 0xbadbadc5;
#endif
while (1)
pxa_cpu_suspend();
}
/* ensure not to come back here if it wasn't intended */
PSPR = 0;
/* restore registers */
RESTORE(GAFR0_L); RESTORE(GAFR0_U);
RESTORE(GAFR1_L); RESTORE(GAFR1_U);
RESTORE(GAFR2_L); RESTORE(GAFR2_U);
RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2);
RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2);
RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2);
RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
#ifdef CONFIG_PXA27x
RESTORE(GAFR3_L); RESTORE(GAFR3_U); RESTORE_GPLEVEL(3);
RESTORE(GPDR3); RESTORE(GRER3); RESTORE(GFER3); RESTORE(PGSR3);
#endif
PSSR = PSSR_RDH | PSSR_PH;
RESTORE(CKEN);
ICLR = 0;
ICCR = 1;
RESTORE(ICMR);
RESTORE(PSTR);
/* restore current time */
rtc.tv_sec = RCNR;
restore_time_delta(&delta, &rtc);
#ifdef DEBUG
printk(KERN_DEBUG "*** made it back from resume\n");
#endif
return 0;
}
unsigned long sleep_phys_sp(void *sp)
{
return virt_to_phys(sp);
}
/*
* Called after processes are frozen, but before we shut down devices.
*/
static int pxa_pm_prepare(suspend_state_t state)
{
return 0;
}
/*
* Called after devices are re-setup, but before processes are thawed.
*/
static int pxa_pm_finish(suspend_state_t state)
{
return 0;
}
/*
* Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
*/
static struct pm_ops pxa_pm_ops = {
.pm_disk_mode = PM_DISK_FIRMWARE,
.prepare = pxa_pm_prepare,
.enter = pxa_pm_enter,
.finish = pxa_pm_finish,
};
static int __init pxa_pm_init(void)
{
pm_set_ops(&pxa_pm_ops);
return 0;
}
late_initcall(pxa_pm_init);
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