| /* |
| * 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/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 **/ |
| if (elf_hwcap & HWCAP_IWMMXT) |
| 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_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); |
| |
| 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); |
| |
| static struct pm_ops pxa_pm_ops = { |
| .prepare = pxa_pm_prepare, |
| .enter = pxa_pm_enter, |
| .finish = pxa_pm_finish, |
| .valid = pm_valid_only_mem, |
| }; |
| |
| static int __init pxa_pm_init(void) |
| { |
| pm_set_ops(&pxa_pm_ops); |
| return 0; |
| } |
| |
| device_initcall(pxa_pm_init); |