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 pxa_cpu_pm_fns->save(sleep_save); 42 43 /* Clear sleep reset status */ 44 RCSR = RCSR_SMR; 45 46 /* before sleeping, calculate and save a checksum */ 47 for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++) 48 sleep_save_checksum += sleep_save[i]; 49 50 /* *** go zzz *** */ 51 pxa_cpu_pm_fns->enter(state); 52 cpu_init(); 53 54 /* after sleeping, validate the checksum */ 55 for (i = 0; i < pxa_cpu_pm_fns->save_size - 1; i++) 56 checksum += sleep_save[i]; 57 58 /* if invalid, display message and wait for a hardware reset */ 59 if (checksum != sleep_save_checksum) { 60 #ifdef CONFIG_ARCH_LUBBOCK 61 LUB_HEXLED = 0xbadbadc5; 62 #endif 63 while (1) 64 pxa_cpu_pm_fns->enter(state); 65 } 66 67 pxa_cpu_pm_fns->restore(sleep_save); 68 69 pr_debug("*** made it back from resume\n"); 70 71 return 0; 72 } 73 74 EXPORT_SYMBOL_GPL(pxa_pm_enter); 75 76 unsigned long sleep_phys_sp(void *sp) 77 { 78 return virt_to_phys(sp); 79 } 80 81 static int pxa_pm_valid(suspend_state_t state) 82 { 83 if (pxa_cpu_pm_fns) 84 return pxa_cpu_pm_fns->valid(state); 85 86 return -EINVAL; 87 } 88 89 static struct pm_ops pxa_pm_ops = { 90 .valid = pxa_pm_valid, 91 .enter = pxa_pm_enter, 92 }; 93 94 static int __init pxa_pm_init(void) 95 { 96 if (!pxa_cpu_pm_fns) { 97 printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n"); 98 return -EINVAL; 99 } 100 101 sleep_save = kmalloc(pxa_cpu_pm_fns->save_size, GFP_KERNEL); 102 if (!sleep_save) { 103 printk(KERN_ERR "failed to alloc memory for pm save\n"); 104 return -ENOMEM; 105 } 106 107 pm_set_ops(&pxa_pm_ops); 108 return 0; 109 } 110 111 device_initcall(pxa_pm_init); 112