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 18 #include <mach/pm.h> 19 20 struct pxa_cpu_pm_fns *pxa_cpu_pm_fns; 21 static unsigned long *sleep_save; 22 23 int pxa_pm_enter(suspend_state_t state) 24 { 25 unsigned long sleep_save_checksum = 0, checksum = 0; 26 int i; 27 28 #ifdef CONFIG_IWMMXT 29 /* force any iWMMXt context to ram **/ 30 if (elf_hwcap & HWCAP_IWMMXT) 31 iwmmxt_task_disable(NULL); 32 #endif 33 34 /* skip registers saving for standby */ 35 if (state != PM_SUSPEND_STANDBY) { 36 pxa_cpu_pm_fns->save(sleep_save); 37 /* before sleeping, calculate and save a checksum */ 38 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++) 39 sleep_save_checksum += sleep_save[i]; 40 } 41 42 /* *** go zzz *** */ 43 pxa_cpu_pm_fns->enter(state); 44 cpu_init(); 45 46 if (state != PM_SUSPEND_STANDBY) { 47 /* after sleeping, validate the checksum */ 48 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++) 49 checksum += sleep_save[i]; 50 51 /* if invalid, display message and wait for a hardware reset */ 52 if (checksum != sleep_save_checksum) { 53 54 lubbock_set_hexled(0xbadbadc5); 55 56 while (1) 57 pxa_cpu_pm_fns->enter(state); 58 } 59 pxa_cpu_pm_fns->restore(sleep_save); 60 } 61 62 pr_debug("*** made it back from resume\n"); 63 64 return 0; 65 } 66 67 EXPORT_SYMBOL_GPL(pxa_pm_enter); 68 69 unsigned long sleep_phys_sp(void *sp) 70 { 71 return virt_to_phys(sp); 72 } 73 74 static int pxa_pm_valid(suspend_state_t state) 75 { 76 if (pxa_cpu_pm_fns) 77 return pxa_cpu_pm_fns->valid(state); 78 79 return -EINVAL; 80 } 81 82 int pxa_pm_prepare(void) 83 { 84 int ret = 0; 85 86 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare) 87 ret = pxa_cpu_pm_fns->prepare(); 88 89 return ret; 90 } 91 92 void pxa_pm_finish(void) 93 { 94 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish) 95 pxa_cpu_pm_fns->finish(); 96 } 97 98 static struct platform_suspend_ops pxa_pm_ops = { 99 .valid = pxa_pm_valid, 100 .enter = pxa_pm_enter, 101 .prepare = pxa_pm_prepare, 102 .finish = pxa_pm_finish, 103 }; 104 105 static int __init pxa_pm_init(void) 106 { 107 if (!pxa_cpu_pm_fns) { 108 printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n"); 109 return -EINVAL; 110 } 111 112 sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long), 113 GFP_KERNEL); 114 if (!sleep_save) { 115 printk(KERN_ERR "failed to alloc memory for pm save\n"); 116 return -ENOMEM; 117 } 118 119 suspend_set_ops(&pxa_pm_ops); 120 return 0; 121 } 122 123 device_initcall(pxa_pm_init); 124