1 /* 2 * PXA250/210 Power Management Routines 3 * 4 * Original code for the SA11x0: 5 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com> 6 * 7 * Modified for the PXA250 by Nicolas Pitre: 8 * Copyright (c) 2002 Monta Vista Software, Inc. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License. 12 */ 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/suspend.h> 16 #include <linux/errno.h> 17 #include <linux/time.h> 18 19 #include <asm/hardware.h> 20 #include <asm/memory.h> 21 #include <asm/system.h> 22 #include <asm/arch/pm.h> 23 #include <asm/arch/pxa-regs.h> 24 #include <asm/arch/lubbock.h> 25 #include <asm/mach/time.h> 26 27 struct pxa_cpu_pm_fns *pxa_cpu_pm_fns; 28 static unsigned long *sleep_save; 29 30 int pxa_pm_enter(suspend_state_t state) 31 { 32 unsigned long sleep_save_checksum = 0, checksum = 0; 33 int i; 34 35 #ifdef CONFIG_IWMMXT 36 /* force any iWMMXt context to ram **/ 37 if (elf_hwcap & HWCAP_IWMMXT) 38 iwmmxt_task_disable(NULL); 39 #endif 40 41 /* skip registers saving for standby */ 42 if (state != PM_SUSPEND_STANDBY) { 43 pxa_cpu_pm_fns->save(sleep_save); 44 /* before sleeping, calculate and save a checksum */ 45 for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++) 46 sleep_save_checksum += sleep_save[i]; 47 } 48 49 /* Clear sleep reset status */ 50 RCSR = RCSR_SMR; 51 52 /* *** go zzz *** */ 53 pxa_cpu_pm_fns->enter(state); 54 cpu_init(); 55 56 if (state != PM_SUSPEND_STANDBY) { 57 /* after sleeping, validate the checksum */ 58 for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++) 59 checksum += sleep_save[i]; 60 61 /* if invalid, display message and wait for a hardware reset */ 62 if (checksum != sleep_save_checksum) { 63 #ifdef CONFIG_ARCH_LUBBOCK 64 LUB_HEXLED = 0xbadbadc5; 65 #endif 66 while (1) 67 pxa_cpu_pm_fns->enter(state); 68 } 69 pxa_cpu_pm_fns->restore(sleep_save); 70 } 71 72 pr_debug("*** made it back from resume\n"); 73 74 return 0; 75 } 76 77 EXPORT_SYMBOL_GPL(pxa_pm_enter); 78 79 unsigned long sleep_phys_sp(void *sp) 80 { 81 return virt_to_phys(sp); 82 } 83 84 static int pxa_pm_valid(suspend_state_t state) 85 { 86 if (pxa_cpu_pm_fns) 87 return pxa_cpu_pm_fns->valid(state); 88 89 return -EINVAL; 90 } 91 92 static struct platform_suspend_ops pxa_pm_ops = { 93 .valid = pxa_pm_valid, 94 .enter = pxa_pm_enter, 95 }; 96 97 static int __init pxa_pm_init(void) 98 { 99 if (!pxa_cpu_pm_fns) { 100 printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n"); 101 return -EINVAL; 102 } 103 104 sleep_save = kmalloc(pxa_cpu_pm_fns->save_size, GFP_KERNEL); 105 if (!sleep_save) { 106 printk(KERN_ERR "failed to alloc memory for pm save\n"); 107 return -ENOMEM; 108 } 109 110 suspend_set_ops(&pxa_pm_ops); 111 return 0; 112 } 113 114 device_initcall(pxa_pm_init); 115