arch/arm/mach-omap2/pm.c

   1 /*
   2  * pm.c - Common OMAP2+ power management-related code
   3  *
   4  * Copyright (C) 2010 Texas Instruments, Inc.
   5  * Copyright (C) 2010 Nokia Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <linux/err.h>
  16 #include <linux/pm_opp.h>
  17 #include <linux/export.h>
  18 #include <linux/suspend.h>
  19 #include <linux/clk.h>
  20 #include <linux/cpu.h>
  21
  22 #include <asm/system_misc.h>
  23
  24 #include "omap_device.h"
  25 #include "common.h"
  26
  27 #include "soc.h"
  28 #include "prcm-common.h"
  29 #include "voltage.h"
  30 #include "powerdomain.h"
  31 #include "clockdomain.h"
  32 #include "pm.h"
  33
  34 #ifdef CONFIG_SUSPEND
  35 /*
  36  * omap_pm_suspend: points to a function that does the SoC-specific
  37  * suspend work
  38  */
  39 static int (*omap_pm_suspend)(void);
  40 #endif
  41
  42 #ifdef CONFIG_PM
  43 /**
  44  * struct omap2_oscillator - Describe the board main oscillator latencies
  45  * @startup_time: oscillator startup latency
  46  * @shutdown_time: oscillator shutdown latency
  47  */
  48 struct omap2_oscillator {
  49         u32 startup_time;
  50         u32 shutdown_time;
  51 };
  52
  53 static struct omap2_oscillator oscillator = {
  54         .startup_time = ULONG_MAX,
  55         .shutdown_time = ULONG_MAX,
  56 };
  57
  58 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
  59 {
  60         oscillator.startup_time = tstart;
  61         oscillator.shutdown_time = tshut;
  62 }
  63
  64 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
  65 {
  66         if (!tstart || !tshut)
  67                 return;
  68
  69         *tstart = oscillator.startup_time;
  70         *tshut = oscillator.shutdown_time;
  71 }
  72 #endif
  73
  74 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
  75 {
  76         clkdm_allow_idle(clkdm);
  77         return 0;
  78 }
  79
  80 #ifdef CONFIG_SUSPEND
  81 static int omap_pm_enter(suspend_state_t suspend_state)
  82 {
  83         int ret = 0;
  84
  85         if (!omap_pm_suspend)
  86                 return -ENOENT; /* XXX doublecheck */
  87
  88         switch (suspend_state) {
  89         case PM_SUSPEND_MEM:
  90                 ret = omap_pm_suspend();
  91                 break;
  92         default:
  93                 ret = -EINVAL;
  94         }
  95
  96         return ret;
  97 }
  98
  99 static int omap_pm_begin(suspend_state_t state)
 100 {
 101         cpu_idle_poll_ctrl(true);
 102         if (soc_is_omap34xx())
 103                 omap_prcm_irq_prepare();
 104         return 0;
 105 }
 106
 107 static void omap_pm_end(void)
 108 {
 109         cpu_idle_poll_ctrl(false);
 110 }
 111
 112 static void omap_pm_wake(void)
 113 {
 114         if (soc_is_omap34xx())
 115                 omap_prcm_irq_complete();
 116 }
 117
 118 static const struct platform_suspend_ops omap_pm_ops = {
 119         .begin          = omap_pm_begin,
 120         .end            = omap_pm_end,
 121         .enter          = omap_pm_enter,
 122         .wake           = omap_pm_wake,
 123         .valid          = suspend_valid_only_mem,
 124 };
 125
 126 /**
 127  * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
 128  * @pm_suspend: function pointer to SoC specific suspend function
 129  */
 130 void omap_common_suspend_init(void *pm_suspend)
 131 {
 132         omap_pm_suspend = pm_suspend;
 133         suspend_set_ops(&omap_pm_ops);
 134 }
 135 #endif /* CONFIG_SUSPEND */
 136
 137 int __maybe_unused omap_pm_nop_init(void)
 138 {
 139         return 0;
 140 }
 141
 142 int (*omap_pm_soc_init)(void);
 143
 144 int __init omap2_common_pm_late_init(void)
 145 {
 146         int error;
 147
 148         if (!omap_pm_soc_init)
 149                 return 0;
 150
 151         /* Init the voltage layer */
 152         omap3_twl_init();
 153         omap4_twl_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);