1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net> 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun #include "cgu.h" 7*4882a593Smuzhiyun #include "pm.h" 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <linux/io.h> 10*4882a593Smuzhiyun #include <linux/syscore_ops.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #define CGU_REG_LCR 0x04 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun #define LCR_LOW_POWER_MODE BIT(0) 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun static void __iomem * __maybe_unused ingenic_cgu_base; 17*4882a593Smuzhiyun ingenic_cgu_pm_suspend(void)18*4882a593Smuzhiyunstatic int __maybe_unused ingenic_cgu_pm_suspend(void) 19*4882a593Smuzhiyun { 20*4882a593Smuzhiyun u32 val = readl(ingenic_cgu_base + CGU_REG_LCR); 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun writel(val | LCR_LOW_POWER_MODE, ingenic_cgu_base + CGU_REG_LCR); 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun return 0; 25*4882a593Smuzhiyun } 26*4882a593Smuzhiyun ingenic_cgu_pm_resume(void)27*4882a593Smuzhiyunstatic void __maybe_unused ingenic_cgu_pm_resume(void) 28*4882a593Smuzhiyun { 29*4882a593Smuzhiyun u32 val = readl(ingenic_cgu_base + CGU_REG_LCR); 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun writel(val & ~LCR_LOW_POWER_MODE, ingenic_cgu_base + CGU_REG_LCR); 32*4882a593Smuzhiyun } 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun static struct syscore_ops __maybe_unused ingenic_cgu_pm_ops = { 35*4882a593Smuzhiyun .suspend = ingenic_cgu_pm_suspend, 36*4882a593Smuzhiyun .resume = ingenic_cgu_pm_resume, 37*4882a593Smuzhiyun }; 38*4882a593Smuzhiyun ingenic_cgu_register_syscore_ops(struct ingenic_cgu * cgu)39*4882a593Smuzhiyunvoid ingenic_cgu_register_syscore_ops(struct ingenic_cgu *cgu) 40*4882a593Smuzhiyun { 41*4882a593Smuzhiyun if (IS_ENABLED(CONFIG_PM_SLEEP)) { 42*4882a593Smuzhiyun ingenic_cgu_base = cgu->base; 43*4882a593Smuzhiyun register_syscore_ops(&ingenic_cgu_pm_ops); 44*4882a593Smuzhiyun } 45*4882a593Smuzhiyun } 46