| GuanXuetao | 6490988 | 2011-02-26 20:23:59 +0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/unicore32/kernel/pm.c |
| 3 | * |
| 4 | * Code specific to PKUnity SoC and UniCore ISA |
| 5 | * |
| 6 | * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> |
| 7 | * Copyright (C) 2001-2010 Guan Xuetao |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 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 | #include <linux/io.h> |
| 19 | |
| 20 | #include <mach/hardware.h> |
| 21 | #include <mach/pm.h> |
| 22 | |
| 23 | #include "setup.h" |
| 24 | |
| 25 | struct puv3_cpu_pm_fns *puv3_cpu_pm_fns; |
| 26 | static unsigned long *sleep_save; |
| 27 | |
| 28 | int puv3_pm_enter(suspend_state_t state) |
| 29 | { |
| 30 | unsigned long sleep_save_checksum = 0, checksum = 0; |
| 31 | int i; |
| 32 | |
| 33 | /* skip registers saving for standby */ |
| 34 | if (state != PM_SUSPEND_STANDBY) { |
| 35 | puv3_cpu_pm_fns->save(sleep_save); |
| 36 | /* before sleeping, calculate and save a checksum */ |
| 37 | for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++) |
| 38 | sleep_save_checksum += sleep_save[i]; |
| 39 | } |
| 40 | |
| 41 | /* *** go zzz *** */ |
| 42 | puv3_cpu_pm_fns->enter(state); |
| 43 | cpu_init(); |
| 44 | #ifdef CONFIG_INPUT_KEYBOARD |
| 45 | puv3_ps2_init(); |
| 46 | #endif |
| 47 | #ifdef CONFIG_PCI |
| 48 | pci_puv3_preinit(); |
| 49 | #endif |
| 50 | if (state != PM_SUSPEND_STANDBY) { |
| 51 | /* after sleeping, validate the checksum */ |
| 52 | for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++) |
| 53 | checksum += sleep_save[i]; |
| 54 | |
| 55 | /* if invalid, display message and wait for a hardware reset */ |
| 56 | if (checksum != sleep_save_checksum) { |
| 57 | while (1) |
| 58 | puv3_cpu_pm_fns->enter(state); |
| 59 | } |
| 60 | puv3_cpu_pm_fns->restore(sleep_save); |
| 61 | } |
| 62 | |
| 63 | pr_debug("*** made it back from resume\n"); |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | EXPORT_SYMBOL_GPL(puv3_pm_enter); |
| 68 | |
| 69 | unsigned long sleep_phys_sp(void *sp) |
| 70 | { |
| 71 | return virt_to_phys(sp); |
| 72 | } |
| 73 | |
| 74 | static int puv3_pm_valid(suspend_state_t state) |
| 75 | { |
| 76 | if (puv3_cpu_pm_fns) |
| 77 | return puv3_cpu_pm_fns->valid(state); |
| 78 | |
| 79 | return -EINVAL; |
| 80 | } |
| 81 | |
| 82 | static int puv3_pm_prepare(void) |
| 83 | { |
| 84 | int ret = 0; |
| 85 | |
| 86 | if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->prepare) |
| 87 | ret = puv3_cpu_pm_fns->prepare(); |
| 88 | |
| 89 | return ret; |
| 90 | } |
| 91 | |
| 92 | static void puv3_pm_finish(void) |
| 93 | { |
| 94 | if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->finish) |
| 95 | puv3_cpu_pm_fns->finish(); |
| 96 | } |
| 97 | |
| 98 | static struct platform_suspend_ops puv3_pm_ops = { |
| 99 | .valid = puv3_pm_valid, |
| 100 | .enter = puv3_pm_enter, |
| 101 | .prepare = puv3_pm_prepare, |
| 102 | .finish = puv3_pm_finish, |
| 103 | }; |
| 104 | |
| 105 | static int __init puv3_pm_init(void) |
| 106 | { |
| 107 | if (!puv3_cpu_pm_fns) { |
| 108 | printk(KERN_ERR "no valid puv3_cpu_pm_fns defined\n"); |
| 109 | return -EINVAL; |
| 110 | } |
| 111 | |
| 112 | sleep_save = kmalloc(puv3_cpu_pm_fns->save_count |
| 113 | * sizeof(unsigned long), 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(&puv3_pm_ops); |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | device_initcall(puv3_pm_init); |
