drivers/clk/ingenic/pm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
   4  */
   5
   6 #include "cgu.h"
   7 #include "pm.h"
   8
   9 #include <linux/io.h>
  10 #include <linux/syscore_ops.h>
  11
  12 #define CGU_REG_LCR             0x04
  13
  14 #define LCR_LOW_POWER_MODE      BIT(0)
  15
  16 static void __iomem * __maybe_unused ingenic_cgu_base;
  17
  18 static int __maybe_unused ingenic_cgu_pm_suspend(void)
  19 {
  20         u32 val = readl(ingenic_cgu_base + CGU_REG_LCR);
  21
  22         writel(val | LCR_LOW_POWER_MODE, ingenic_cgu_base + CGU_REG_LCR);
  23
  24         return 0;
  25 }
  26
  27 static void __maybe_unused ingenic_cgu_pm_resume(void)
  28 {
  29         u32 val = readl(ingenic_cgu_base + CGU_REG_LCR);
  30
  31         writel(val & ~LCR_LOW_POWER_MODE, ingenic_cgu_base + CGU_REG_LCR);
  32 }
  33
  34 static struct syscore_ops __maybe_unused ingenic_cgu_pm_ops = {
  35         .suspend = ingenic_cgu_pm_suspend,
  36         .resume = ingenic_cgu_pm_resume,
  37 };
  38
  39 void ingenic_cgu_register_syscore_ops(struct ingenic_cgu *cgu)
  40 {
  41         if (IS_ENABLED(CONFIG_PM_SLEEP)) {
  42                 ingenic_cgu_base = cgu->base;
  43                 register_syscore_ops(&ingenic_cgu_pm_ops);
  44         }
  45 }