1 /* 2 * Runtime PM support code 3 * 4 * Copyright (C) 2009-2010 Magnus Damm 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/io.h> 14 #include <linux/pm_runtime.h> 15 #include <linux/pm_domain.h> 16 #include <linux/pm_clock.h> 17 #include <linux/platform_device.h> 18 #include <linux/clk.h> 19 #include <linux/sh_clk.h> 20 #include <linux/bitmap.h> 21 #include <linux/slab.h> 22 23 #ifdef CONFIG_PM_RUNTIME 24 static int sh_pm_runtime_suspend(struct device *dev) 25 { 26 int ret; 27 28 ret = pm_generic_runtime_suspend(dev); 29 if (ret) { 30 dev_err(dev, "failed to suspend device\n"); 31 return ret; 32 } 33 34 ret = pm_clk_suspend(dev); 35 if (ret) { 36 dev_err(dev, "failed to suspend clock\n"); 37 pm_generic_runtime_resume(dev); 38 return ret; 39 } 40 41 return 0; 42 } 43 44 static int sh_pm_runtime_resume(struct device *dev) 45 { 46 int ret; 47 48 ret = pm_clk_resume(dev); 49 if (ret) { 50 dev_err(dev, "failed to resume clock\n"); 51 return ret; 52 } 53 54 return pm_generic_runtime_resume(dev); 55 } 56 57 static struct dev_pm_domain default_pm_domain = { 58 .ops = { 59 .runtime_suspend = sh_pm_runtime_suspend, 60 .runtime_resume = sh_pm_runtime_resume, 61 USE_PLATFORM_PM_SLEEP_OPS 62 }, 63 }; 64 65 #define DEFAULT_PM_DOMAIN_PTR (&default_pm_domain) 66 67 #else 68 69 #define DEFAULT_PM_DOMAIN_PTR NULL 70 71 #endif /* CONFIG_PM_RUNTIME */ 72 73 static struct pm_clk_notifier_block platform_bus_notifier = { 74 .pm_domain = DEFAULT_PM_DOMAIN_PTR, 75 .con_ids = { NULL, }, 76 }; 77 78 static bool default_pm_on; 79 80 static int __init sh_pm_runtime_init(void) 81 { 82 if (IS_ENABLED(CONFIG_ARCH_SHMOBILE_MULTI)) { 83 if (!of_machine_is_compatible("renesas,emev2") && 84 !of_machine_is_compatible("renesas,r7s72100") && 85 !of_machine_is_compatible("renesas,r8a73a4") && 86 !of_machine_is_compatible("renesas,r8a7740") && 87 !of_machine_is_compatible("renesas,r8a7778") && 88 !of_machine_is_compatible("renesas,r8a7779") && 89 !of_machine_is_compatible("renesas,r8a7790") && 90 !of_machine_is_compatible("renesas,r8a7791") && 91 !of_machine_is_compatible("renesas,r8a7792") && 92 !of_machine_is_compatible("renesas,r8a7793") && 93 !of_machine_is_compatible("renesas,r8a7794") && 94 !of_machine_is_compatible("renesas,sh7372") && 95 !of_machine_is_compatible("renesas,sh73a0")) 96 return 0; 97 } 98 99 default_pm_on = true; 100 pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier); 101 return 0; 102 } 103 core_initcall(sh_pm_runtime_init); 104 105 static int __init sh_pm_runtime_late_init(void) 106 { 107 if (default_pm_on) 108 pm_genpd_poweroff_unused(); 109 return 0; 110 } 111 late_initcall(sh_pm_runtime_late_init); 112