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/slab.h> 18 19 #include <mach/pm.h> 20 21 struct pxa_cpu_pm_fns *pxa_cpu_pm_fns; 22 static unsigned long *sleep_save; 23 24 int pxa_pm_enter(suspend_state_t state) 25 { 26 unsigned long sleep_save_checksum = 0, checksum = 0; 27 int i; 28 29 #ifdef CONFIG_IWMMXT 30 /* force any iWMMXt context to ram **/ 31 if (elf_hwcap & HWCAP_IWMMXT) 32 iwmmxt_task_disable(NULL); 33 #endif 34 35 /* skip registers saving for standby */ 36 if (state != PM_SUSPEND_STANDBY) { 37 pxa_cpu_pm_fns->save(sleep_save); 38 /* before sleeping, calculate and save a checksum */ 39 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++) 40 sleep_save_checksum += sleep_save[i]; 41 } 42 43 /* *** go zzz *** */ 44 pxa_cpu_pm_fns->enter(state); 45 cpu_init(); 46 47 if (state != PM_SUSPEND_STANDBY) { 48 /* after sleeping, validate the checksum */ 49 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++) 50 checksum += sleep_save[i]; 51 52 /* if invalid, display message and wait for a hardware reset */ 53 if (checksum != sleep_save_checksum) { 54 55 lubbock_set_hexled(0xbadbadc5); 56 57 while (1) 58 pxa_cpu_pm_fns->enter(state); 59 } 60 pxa_cpu_pm_fns->restore(sleep_save); 61 } 62 63 pr_debug("*** made it back from resume\n"); 64 65 return 0; 66 } 67 68 EXPORT_SYMBOL_GPL(pxa_pm_enter); 69 70 unsigned long sleep_phys_sp(void *sp) 71 { 72 return virt_to_phys(sp); 73 } 74 75 static int pxa_pm_valid(suspend_state_t state) 76 { 77 if (pxa_cpu_pm_fns) 78 return pxa_cpu_pm_fns->valid(state); 79 80 return -EINVAL; 81 } 82 83 int pxa_pm_prepare(void) 84 { 85 int ret = 0; 86 87 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare) 88 ret = pxa_cpu_pm_fns->prepare(); 89 90 return ret; 91 } 92 93 void pxa_pm_finish(void) 94 { 95 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish) 96 pxa_cpu_pm_fns->finish(); 97 } 98 99 static struct platform_suspend_ops pxa_pm_ops = { 100 .valid = pxa_pm_valid, 101 .enter = pxa_pm_enter, 102 .prepare = pxa_pm_prepare, 103 .finish = pxa_pm_finish, 104 }; 105 106 static int __init pxa_pm_init(void) 107 { 108 if (!pxa_cpu_pm_fns) { 109 printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n"); 110 return -EINVAL; 111 } 112 113 sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long), 114 GFP_KERNEL); 115 if (!sleep_save) { 116 printk(KERN_ERR "failed to alloc memory for pm save\n"); 117 return -ENOMEM; 118 } 119 120 suspend_set_ops(&pxa_pm_ops); 121 return 0; 122 } 123 124 device_initcall(pxa_pm_init); 125