// SPDX-License-Identifier: GPL-2.0-only /* * linux/arch/unicore32/kernel/pm.c * * Code specific to PKUnity SoC and UniCore ISA * * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> * Copyright (C) 2001-2010 Guan Xuetao */ #include <linux/init.h> #include <linux/module.h> #include <linux/suspend.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/io.h> #include <mach/hardware.h> #include <mach/pm.h> #include "setup.h" struct puv3_cpu_pm_fns *puv3_cpu_pm_fns; static unsigned long *sleep_save; int puv3_pm_enter(suspend_state_t state) { unsigned long sleep_save_checksum = 0, checksum = 0; int i; /* skip registers saving for standby */ if (state != PM_SUSPEND_STANDBY) { puv3_cpu_pm_fns->save(sleep_save); /* before sleeping, calculate and save a checksum */ for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++) sleep_save_checksum += sleep_save[i]; } /* *** go zzz *** */ puv3_cpu_pm_fns->enter(state); cpu_init(); #ifdef CONFIG_INPUT_KEYBOARD puv3_ps2_init(); #endif #ifdef CONFIG_PCI pci_puv3_preinit(); #endif if (state != PM_SUSPEND_STANDBY) { /* after sleeping, validate the checksum */ for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++) checksum += sleep_save[i]; /* if invalid, display message and wait for a hardware reset */ if (checksum != sleep_save_checksum) { while (1) puv3_cpu_pm_fns->enter(state); } puv3_cpu_pm_fns->restore(sleep_save); } pr_debug("*** made it back from resume\n"); return 0; } EXPORT_SYMBOL_GPL(puv3_pm_enter); unsigned long sleep_phys_sp(void *sp) { return virt_to_phys(sp); } static int puv3_pm_valid(suspend_state_t state) { if (puv3_cpu_pm_fns) return puv3_cpu_pm_fns->valid(state); return -EINVAL; } static int puv3_pm_prepare(void) { int ret = 0; if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->prepare) ret = puv3_cpu_pm_fns->prepare(); return ret; } static void puv3_pm_finish(void) { if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->finish) puv3_cpu_pm_fns->finish(); } static struct platform_suspend_ops puv3_pm_ops = { .valid = puv3_pm_valid, .enter = puv3_pm_enter, .prepare = puv3_pm_prepare, .finish = puv3_pm_finish, }; static int __init puv3_pm_init(void) { if (!puv3_cpu_pm_fns) { printk(KERN_ERR "no valid puv3_cpu_pm_fns defined\n"); return -EINVAL; } sleep_save = kmalloc_array(puv3_cpu_pm_fns->save_count, sizeof(unsigned long), GFP_KERNEL); if (!sleep_save) { printk(KERN_ERR "failed to alloc memory for pm save\n"); return -ENOMEM; } suspend_set_ops(&puv3_pm_ops); return 0; } device_initcall(puv3_pm_init);