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_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);