arch/mips/loongson64/pm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * loongson-specific suspend support
   4  *
   5  *  Copyright (C) 2009 Lemote Inc.
   6  *  Author: Wu Zhangjin <wuzhangjin@gmail.com>
   7  */
   8 #include <linux/suspend.h>
   9 #include <linux/pm.h>
  10
  11 #include <asm/mipsregs.h>
  12
  13 #include <loongson.h>
  14
  15 asmlinkage void loongson_lefi_sleep(unsigned long sleep_addr);
  16
  17 static int lefi_pm_enter(suspend_state_t state)
  18 {
  19         switch (state) {
  20         case PM_SUSPEND_MEM:
  21                 pm_set_suspend_via_firmware();
  22                 loongson_lefi_sleep(loongson_sysconf.suspend_addr);
  23                 pm_set_resume_via_firmware();
  24                 return 0;
  25         default:
  26                 return -EINVAL;
  27         }
  28 }
  29
  30 static int lefi_pm_valid_state(suspend_state_t state)
  31 {
  32         switch (state) {
  33         case PM_SUSPEND_MEM:
  34                 return !!loongson_sysconf.suspend_addr;
  35         default:
  36                 return 0;
  37         }
  38 }
  39
  40 static const struct platform_suspend_ops lefi_pm_ops = {
  41         .valid  = lefi_pm_valid_state,
  42         .enter  = lefi_pm_enter,
  43 };
  44
  45 static int __init loongson_pm_init(void)
  46 {
  47         if (loongson_sysconf.fw_interface == LOONGSON_LEFI)
  48                 suspend_set_ops(&lefi_pm_ops);
  49
  50         return 0;
  51 }
  52 arch_initcall(loongson_pm_init);