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 #ifdef CONFIG_SUSPEND
  32 /*
  33  * omap_pm_suspend: points to a function that does the SoC-specific
  34  * suspend work
  35  */
  36 static int (*omap_pm_suspend)(void);
  37 #endif
  38
  39 #ifdef CONFIG_PM
  40 /**
  41  * struct omap2_oscillator - Describe the board main oscillator latencies
  42  * @startup_time: oscillator startup latency
  43  * @shutdown_time: oscillator shutdown latency
  44  */
  45 struct omap2_oscillator {
  46         u32 startup_time;
  47         u32 shutdown_time;
  48 };
  49
  50 static struct omap2_oscillator oscillator = {
  51         .startup_time = ULONG_MAX,
  52         .shutdown_time = ULONG_MAX,
  53 };
  54
  55 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
  56 {
  57         oscillator.startup_time = tstart;
  58         oscillator.shutdown_time = tshut;
  59 }
  60
  61 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
  62 {
  63         if (!tstart || !tshut)
  64                 return;
  65
  66         *tstart = oscillator.startup_time;
  67         *tshut = oscillator.shutdown_time;
  68 }
  69 #endif
  70
  71 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
  72 {
  73         clkdm_allow_idle(clkdm);
  74         return 0;
  75 }
  76
  77 #ifdef CONFIG_SUSPEND
  78 static int omap_pm_enter(suspend_state_t suspend_state)
  79 {
  80         int ret = 0;
  81
  82         if (!omap_pm_suspend)
  83                 return -ENOENT; /* XXX doublecheck */
  84
  85         switch (suspend_state) {
  86         case PM_SUSPEND_MEM:
  87                 ret = omap_pm_suspend();
  88                 break;
  89         default:
  90                 ret = -EINVAL;
  91         }
  92
  93         return ret;
  94 }
  95
  96 static int omap_pm_begin(suspend_state_t state)
  97 {
  98         cpu_idle_poll_ctrl(true);
  99         if (soc_is_omap34xx())
 100                 omap_prcm_irq_prepare();
 101         return 0;
 102 }
 103
 104 static void omap_pm_end(void)
 105 {
 106         cpu_idle_poll_ctrl(false);
 107 }
 108
 109 static void omap_pm_wake(void)
 110 {
 111         if (soc_is_omap34xx())
 112                 omap_prcm_irq_complete();
 113 }
 114
 115 static const struct platform_suspend_ops omap_pm_ops = {
 116         .begin          = omap_pm_begin,
 117         .end            = omap_pm_end,
 118         .enter          = omap_pm_enter,
 119         .wake           = omap_pm_wake,
 120         .valid          = suspend_valid_only_mem,
 121 };
 122
 123 /**
 124  * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
 125  * @pm_suspend: function pointer to SoC specific suspend function
 126  */
 127 void omap_common_suspend_init(void *pm_suspend)
 128 {
 129         omap_pm_suspend = pm_suspend;
 130         suspend_set_ops(&omap_pm_ops);
 131 }
 132 #endif /* CONFIG_SUSPEND */
 133
 134 int __maybe_unused omap_pm_nop_init(void)
 135 {
 136         return 0;
 137 }
 138
 139 int (*omap_pm_soc_init)(void);
 140
 141 int __init omap2_common_pm_late_init(void)
 142 {
 143         int error;
 144
 145         if (!omap_pm_soc_init)
 146                 return 0;
 147
 148         /* Init the voltage layer */
 149         omap3_twl_init();
 150         omap4_twl_init();
 151         omap4_cpcap_init();
 152         omap_voltage_late_init();
 153
 154         /* Smartreflex device init */
 155         omap_devinit_smartreflex();
 156
 157         error = omap_pm_soc_init();
 158         if (error)
 159                 pr_warn("%s: pm soc init failed: %i\n", __func__, error);
 160
 161         omap2_clk_enable_autoidle_all();
 162
 163         return 0;
 164 }
 165 omap_late_initcall(omap2_common_pm_late_init);