1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * pm.c - Common OMAP2+ power management-related code 4 * 5 * Copyright (C) 2010 Texas Instruments, Inc. 6 * Copyright (C) 2010 Nokia Corporation 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/io.h> 12 #include <linux/err.h> 13 #include <linux/pm_opp.h> 14 #include <linux/export.h> 15 #include <linux/suspend.h> 16 #include <linux/clk.h> 17 #include <linux/cpu.h> 18 19 #include <asm/system_misc.h> 20 21 #include "omap_device.h" 22 #include "common.h" 23 24 #include "soc.h" 25 #include "prcm-common.h" 26 #include "voltage.h" 27 #include "powerdomain.h" 28 #include "clockdomain.h" 29 #include "pm.h" 30 31 u32 enable_off_mode; 32 33 #ifdef CONFIG_SUSPEND 34 /* 35 * omap_pm_suspend: points to a function that does the SoC-specific 36 * suspend work 37 */ 38 static int (*omap_pm_suspend)(void); 39 #endif 40 41 #ifdef CONFIG_PM 42 /** 43 * struct omap2_oscillator - Describe the board main oscillator latencies 44 * @startup_time: oscillator startup latency 45 * @shutdown_time: oscillator shutdown latency 46 */ 47 struct omap2_oscillator { 48 u32 startup_time; 49 u32 shutdown_time; 50 }; 51 52 static struct omap2_oscillator oscillator = { 53 .startup_time = ULONG_MAX, 54 .shutdown_time = ULONG_MAX, 55 }; 56 57 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut) 58 { 59 if (!tstart || !tshut) 60 return; 61 62 *tstart = oscillator.startup_time; 63 *tshut = oscillator.shutdown_time; 64 } 65 #endif 66 67 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused) 68 { 69 clkdm_allow_idle(clkdm); 70 return 0; 71 } 72 73 #ifdef CONFIG_SUSPEND 74 static int omap_pm_enter(suspend_state_t suspend_state) 75 { 76 int ret = 0; 77 78 if (!omap_pm_suspend) 79 return -ENOENT; /* XXX doublecheck */ 80 81 switch (suspend_state) { 82 case PM_SUSPEND_MEM: 83 ret = omap_pm_suspend(); 84 break; 85 default: 86 ret = -EINVAL; 87 } 88 89 return ret; 90 } 91 92 static int omap_pm_begin(suspend_state_t state) 93 { 94 cpu_idle_poll_ctrl(true); 95 if (soc_is_omap34xx()) 96 omap_prcm_irq_prepare(); 97 return 0; 98 } 99 100 static void omap_pm_end(void) 101 { 102 cpu_idle_poll_ctrl(false); 103 } 104 105 static void omap_pm_wake(void) 106 { 107 if (soc_is_omap34xx()) 108 omap_prcm_irq_complete(); 109 } 110 111 static const struct platform_suspend_ops omap_pm_ops = { 112 .begin = omap_pm_begin, 113 .end = omap_pm_end, 114 .enter = omap_pm_enter, 115 .wake = omap_pm_wake, 116 .valid = suspend_valid_only_mem, 117 }; 118 119 /** 120 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs 121 * @pm_suspend: function pointer to SoC specific suspend function 122 */ 123 void omap_common_suspend_init(void *pm_suspend) 124 { 125 omap_pm_suspend = pm_suspend; 126 suspend_set_ops(&omap_pm_ops); 127 } 128 #endif /* CONFIG_SUSPEND */ 129 130 int __maybe_unused omap_pm_nop_init(void) 131 { 132 return 0; 133 } 134 135 int (*omap_pm_soc_init)(void); 136 137 static int __init omap2_common_pm_late_init(void) 138 { 139 int error; 140 141 if (!omap_pm_soc_init) 142 return 0; 143 144 /* Init the voltage layer */ 145 omap3_twl_init(); 146 omap4_twl_init(); 147 omap4_cpcap_init(); 148 omap_voltage_late_init(); 149 150 /* Smartreflex device init */ 151 omap_devinit_smartreflex(); 152 153 error = omap_pm_soc_init(); 154 if (error) 155 pr_warn("%s: pm soc init failed: %i\n", __func__, error); 156 157 omap2_clk_enable_autoidle_all(); 158 159 return 0; 160 } 161 omap_late_initcall(omap2_common_pm_late_init); 162