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 31u32 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 */ 38static 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 */ 47struct omap2_oscillator { 48 u32 startup_time; 49 u32 shutdown_time; 50}; 51 52static struct omap2_oscillator oscillator = { 53 .startup_time = ULONG_MAX, 54 .shutdown_time = ULONG_MAX, 55}; 56 57void 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 67int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused) 68{ 69 clkdm_allow_idle(clkdm); 70 return 0; 71} 72 73#ifdef CONFIG_SUSPEND 74static 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 92static 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 100static void omap_pm_end(void) 101{ 102 cpu_idle_poll_ctrl(false); 103} 104 105static void omap_pm_wake(void) 106{ 107 if (soc_is_omap34xx()) 108 omap_prcm_irq_complete(); 109} 110 111static 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 */ 123void 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 130int __maybe_unused omap_pm_nop_init(void) 131{ 132 return 0; 133} 134 135int (*omap_pm_soc_init)(void); 136 137static 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} 161omap_late_initcall(omap2_common_pm_late_init); 162