168 lines
3.2 KiB
C
168 lines
3.2 KiB
C
/*
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* pm.c - Common OMAP2+ power management-related code
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*
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* Copyright (C) 2010 Texas Instruments, Inc.
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* Copyright (C) 2010 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/pm_opp.h>
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#include <linux/export.h>
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#include <linux/suspend.h>
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#include <linux/clk.h>
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#include <linux/cpu.h>
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#include <asm/system_misc.h>
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#include "omap_device.h"
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#include "common.h"
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#include "soc.h"
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#include "prcm-common.h"
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#include "voltage.h"
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#include "powerdomain.h"
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#include "clockdomain.h"
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#include "pm.h"
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#ifdef CONFIG_SUSPEND
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/*
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* omap_pm_suspend: points to a function that does the SoC-specific
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* suspend work
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*/
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static int (*omap_pm_suspend)(void);
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#endif
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#ifdef CONFIG_PM
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/**
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* struct omap2_oscillator - Describe the board main oscillator latencies
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* @startup_time: oscillator startup latency
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* @shutdown_time: oscillator shutdown latency
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*/
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struct omap2_oscillator {
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u32 startup_time;
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u32 shutdown_time;
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};
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static struct omap2_oscillator oscillator = {
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.startup_time = ULONG_MAX,
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.shutdown_time = ULONG_MAX,
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};
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void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
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{
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oscillator.startup_time = tstart;
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oscillator.shutdown_time = tshut;
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}
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void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
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{
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if (!tstart || !tshut)
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return;
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*tstart = oscillator.startup_time;
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*tshut = oscillator.shutdown_time;
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}
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#endif
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int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
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{
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clkdm_allow_idle(clkdm);
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return 0;
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}
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#ifdef CONFIG_SUSPEND
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static int omap_pm_enter(suspend_state_t suspend_state)
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{
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int ret = 0;
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if (!omap_pm_suspend)
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return -ENOENT; /* XXX doublecheck */
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switch (suspend_state) {
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case PM_SUSPEND_MEM:
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ret = omap_pm_suspend();
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static int omap_pm_begin(suspend_state_t state)
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{
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cpu_idle_poll_ctrl(true);
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if (soc_is_omap34xx())
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omap_prcm_irq_prepare();
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return 0;
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}
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static void omap_pm_end(void)
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{
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cpu_idle_poll_ctrl(false);
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}
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static void omap_pm_wake(void)
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{
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if (soc_is_omap34xx())
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omap_prcm_irq_complete();
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}
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static const struct platform_suspend_ops omap_pm_ops = {
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.begin = omap_pm_begin,
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.end = omap_pm_end,
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.enter = omap_pm_enter,
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.wake = omap_pm_wake,
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.valid = suspend_valid_only_mem,
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};
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/**
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* omap_common_suspend_init - Set common suspend routines for OMAP SoCs
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* @pm_suspend: function pointer to SoC specific suspend function
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*/
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void omap_common_suspend_init(void *pm_suspend)
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{
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omap_pm_suspend = pm_suspend;
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suspend_set_ops(&omap_pm_ops);
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}
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#endif /* CONFIG_SUSPEND */
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int __maybe_unused omap_pm_nop_init(void)
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{
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return 0;
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}
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int (*omap_pm_soc_init)(void);
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int __init omap2_common_pm_late_init(void)
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{
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int error;
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if (!omap_pm_soc_init)
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return 0;
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/* Init the voltage layer */
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omap3_twl_init();
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omap4_twl_init();
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omap_voltage_late_init();
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/* Smartreflex device init */
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omap_devinit_smartreflex();
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error = omap_pm_soc_init();
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if (error)
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pr_warn("%s: pm soc init failed: %i\n", __func__, error);
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omap2_clk_enable_autoidle_all();
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return 0;
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}
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omap_late_initcall(omap2_common_pm_late_init);
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