arch/arm/mach-omap2/pm.c

   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_setup_oscillator(u32 tstart, u32 tshut)
  58 {
  59         oscillator.startup_time = tstart;
  60         oscillator.shutdown_time = tshut;
  61 }
  62
  63 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
  64 {
  65         if (!tstart || !tshut)
  66                 return;
  67
  68         *tstart = oscillator.startup_time;
  69         *tshut = oscillator.shutdown_time;
  70 }
  71 #endif
  72
  73 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
  74 {
  75         clkdm_allow_idle(clkdm);
  76         return 0;
  77 }
  78
  79 #ifdef CONFIG_SUSPEND
  80 static int omap_pm_enter(suspend_state_t suspend_state)
  81 {
  82         int ret = 0;
  83
  84         if (!omap_pm_suspend)
  85                 return -ENOENT; /* XXX doublecheck */
  86
  87         switch (suspend_state) {
  88         case PM_SUSPEND_MEM:
  89                 ret = omap_pm_suspend();
  90                 break;
  91         default:
  92                 ret = -EINVAL;
  93         }
  94
  95         return ret;
  96 }
  97
  98 static int omap_pm_begin(suspend_state_t state)
  99 {
 100         cpu_idle_poll_ctrl(true);
 101         if (soc_is_omap34xx())
 102                 omap_prcm_irq_prepare();
 103         return 0;
 104 }
 105
 106 static void omap_pm_end(void)
 107 {
 108         cpu_idle_poll_ctrl(false);
 109 }
 110
 111 static void omap_pm_wake(void)
 112 {
 113         if (soc_is_omap34xx())
 114                 omap_prcm_irq_complete();
 115 }
 116
 117 static const struct platform_suspend_ops omap_pm_ops = {
 118         .begin          = omap_pm_begin,
 119         .end            = omap_pm_end,
 120         .enter          = omap_pm_enter,
 121         .wake           = omap_pm_wake,
 122         .valid          = suspend_valid_only_mem,
 123 };
 124
 125 /**
 126  * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
 127  * @pm_suspend: function pointer to SoC specific suspend function
 128  */
 129 void omap_common_suspend_init(void *pm_suspend)
 130 {
 131         omap_pm_suspend = pm_suspend;
 132         suspend_set_ops(&omap_pm_ops);
 133 }
 134 #endif /* CONFIG_SUSPEND */
 135
 136 int __maybe_unused omap_pm_nop_init(void)
 137 {
 138         return 0;
 139 }
 140
 141 int (*omap_pm_soc_init)(void);
 142
 143 int __init omap2_common_pm_late_init(void)
 144 {
 145         int error;
 146
 147         if (!omap_pm_soc_init)
 148                 return 0;
 149
 150         /* Init the voltage layer */
 151         omap3_twl_init();
 152         omap4_twl_init();
 153         omap4_cpcap_init();
 154         omap_voltage_late_init();
 155
 156         /* Smartreflex device init */
 157         omap_devinit_smartreflex();
 158
 159         error = omap_pm_soc_init();
 160         if (error)
 161                 pr_warn("%s: pm soc init failed: %i\n", __func__, error);
 162
 163         omap2_clk_enable_autoidle_all();
 164
 165         return 0;
 166 }
 167 omap_late_initcall(omap2_common_pm_late_init);