/* * 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/module.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/pm.h> #include <asm/arch/pxa-regs.h> #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 }; 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; extern void pxa_cpu_pm_enter(suspend_state_t state); #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(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 /* 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; /* *** go zzz *** */ pxa_cpu_pm_enter(state); cpu_init(); /* 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_pm_enter(state); } /* 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(MDREFR); RESTORE(GAFR3_L); RESTORE(GAFR3_U); RESTORE_GPLEVEL(3); RESTORE(GPDR3); 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); 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; } EXPORT_SYMBOL_GPL(pxa_pm_enter); unsigned long sleep_phys_sp(void *sp) { return virt_to_phys(sp); } /* * Called after processes are frozen, but before we shut down devices. */ int pxa_pm_prepare(suspend_state_t state) { extern int pxa_cpu_pm_prepare(suspend_state_t state); return pxa_cpu_pm_prepare(state); } EXPORT_SYMBOL_GPL(pxa_pm_prepare); /* * Called after devices are re-setup, but before processes are thawed. */ int pxa_pm_finish(suspend_state_t state) { return 0; } EXPORT_SYMBOL_GPL(pxa_pm_finish); /* * 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; } device_initcall(pxa_pm_init);