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228 lines
5.1 KiB
C
228 lines
5.1 KiB
C
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/*
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* PXA250/210 Power Management Routines
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*
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* Original code for the SA11x0:
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* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
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*
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* Modified for the PXA250 by Nicolas Pitre:
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* Copyright (c) 2002 Monta Vista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License.
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/suspend.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <asm/hardware.h>
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#include <asm/memory.h>
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#include <asm/system.h>
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#include <asm/arch/pxa-regs.h>
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#include <asm/arch/lubbock.h>
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#include <asm/mach/time.h>
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/*
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* Debug macros
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*/
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#undef DEBUG
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extern void pxa_cpu_suspend(void);
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extern void pxa_cpu_resume(void);
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#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
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#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
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#define RESTORE_GPLEVEL(n) do { \
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GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \
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GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \
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} while (0)
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/*
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* List of global PXA peripheral registers to preserve.
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* More ones like CP and general purpose register values are preserved
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* with the stack pointer in sleep.S.
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*/
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enum { SLEEP_SAVE_START = 0,
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SLEEP_SAVE_GPLR0, SLEEP_SAVE_GPLR1, SLEEP_SAVE_GPLR2, SLEEP_SAVE_GPLR3,
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SLEEP_SAVE_GPDR0, SLEEP_SAVE_GPDR1, SLEEP_SAVE_GPDR2, SLEEP_SAVE_GPDR3,
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SLEEP_SAVE_GRER0, SLEEP_SAVE_GRER1, SLEEP_SAVE_GRER2, SLEEP_SAVE_GRER3,
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SLEEP_SAVE_GFER0, SLEEP_SAVE_GFER1, SLEEP_SAVE_GFER2, SLEEP_SAVE_GFER3,
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SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2, SLEEP_SAVE_PGSR3,
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SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
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SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
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SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
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SLEEP_SAVE_GAFR3_L, SLEEP_SAVE_GAFR3_U,
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SLEEP_SAVE_PSTR,
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SLEEP_SAVE_ICMR,
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SLEEP_SAVE_CKEN,
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SLEEP_SAVE_CKSUM,
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SLEEP_SAVE_SIZE
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};
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static int pxa_pm_enter(suspend_state_t state)
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{
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unsigned long sleep_save[SLEEP_SAVE_SIZE];
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unsigned long checksum = 0;
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struct timespec delta, rtc;
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int i;
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if (state != PM_SUSPEND_MEM)
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return -EINVAL;
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#ifdef CONFIG_IWMMXT
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/* force any iWMMXt context to ram **/
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iwmmxt_task_disable(NULL);
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#endif
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/* preserve current time */
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rtc.tv_sec = RCNR;
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rtc.tv_nsec = 0;
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save_time_delta(&delta, &rtc);
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SAVE(GPLR0); SAVE(GPLR1); SAVE(GPLR2);
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SAVE(GPDR0); SAVE(GPDR1); SAVE(GPDR2);
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SAVE(GRER0); SAVE(GRER1); SAVE(GRER2);
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SAVE(GFER0); SAVE(GFER1); SAVE(GFER2);
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SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
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SAVE(GAFR0_L); SAVE(GAFR0_U);
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SAVE(GAFR1_L); SAVE(GAFR1_U);
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SAVE(GAFR2_L); SAVE(GAFR2_U);
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#ifdef CONFIG_PXA27x
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SAVE(GPLR3); SAVE(GPDR3); SAVE(GRER3); SAVE(GFER3); SAVE(PGSR3);
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SAVE(GAFR3_L); SAVE(GAFR3_U);
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#endif
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SAVE(ICMR);
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ICMR = 0;
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SAVE(CKEN);
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CKEN = 0;
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SAVE(PSTR);
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/* Note: wake up source are set up in each machine specific files */
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/* clear GPIO transition detect bits */
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GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
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#ifdef CONFIG_PXA27x
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GEDR3 = GEDR3;
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#endif
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/* Clear sleep reset status */
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RCSR = RCSR_SMR;
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/* set resume return address */
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PSPR = virt_to_phys(pxa_cpu_resume);
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/* before sleeping, calculate and save a checksum */
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for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
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checksum += sleep_save[i];
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sleep_save[SLEEP_SAVE_CKSUM] = checksum;
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/* *** go zzz *** */
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pxa_cpu_suspend();
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/* after sleeping, validate the checksum */
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checksum = 0;
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for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
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checksum += sleep_save[i];
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/* if invalid, display message and wait for a hardware reset */
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if (checksum != sleep_save[SLEEP_SAVE_CKSUM]) {
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#ifdef CONFIG_ARCH_LUBBOCK
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LUB_HEXLED = 0xbadbadc5;
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#endif
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while (1)
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pxa_cpu_suspend();
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}
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/* ensure not to come back here if it wasn't intended */
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PSPR = 0;
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/* restore registers */
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RESTORE(GAFR0_L); RESTORE(GAFR0_U);
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RESTORE(GAFR1_L); RESTORE(GAFR1_U);
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RESTORE(GAFR2_L); RESTORE(GAFR2_U);
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RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
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RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2);
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RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2);
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RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2);
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RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
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#ifdef CONFIG_PXA27x
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RESTORE(GAFR3_L); RESTORE(GAFR3_U); RESTORE_GPLEVEL(3);
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RESTORE(GPDR3); RESTORE(GRER3); RESTORE(GFER3); RESTORE(PGSR3);
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#endif
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PSSR = PSSR_RDH | PSSR_PH;
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RESTORE(CKEN);
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ICLR = 0;
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ICCR = 1;
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RESTORE(ICMR);
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RESTORE(PSTR);
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/* restore current time */
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rtc.tv_sec = RCNR;
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restore_time_delta(&delta, &rtc);
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#ifdef DEBUG
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printk(KERN_DEBUG "*** made it back from resume\n");
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#endif
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return 0;
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}
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unsigned long sleep_phys_sp(void *sp)
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{
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return virt_to_phys(sp);
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}
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/*
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* Called after processes are frozen, but before we shut down devices.
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*/
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static int pxa_pm_prepare(suspend_state_t state)
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{
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return 0;
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}
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/*
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* Called after devices are re-setup, but before processes are thawed.
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*/
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static int pxa_pm_finish(suspend_state_t state)
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{
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return 0;
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}
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/*
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* Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
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*/
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static struct pm_ops pxa_pm_ops = {
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.pm_disk_mode = PM_DISK_FIRMWARE,
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.prepare = pxa_pm_prepare,
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.enter = pxa_pm_enter,
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.finish = pxa_pm_finish,
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};
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static int __init pxa_pm_init(void)
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{
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pm_set_ops(&pxa_pm_ops);
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return 0;
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}
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late_initcall(pxa_pm_init);
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