// SPDX-License-Identifier: GPL-2.0-only
/*
 * pm.c - Common OMAP2+ power management-related code
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 * Copyright (C) 2010 Nokia Corporation
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/pm_opp.h>
#include <linux/export.h>
#include <linux/suspend.h>
#include <linux/clk.h>
#include <linux/cpu.h>

#include <asm/system_misc.h>

#include "omap_device.h"
#include "common.h"

#include "soc.h"
#include "prcm-common.h"
#include "voltage.h"
#include "powerdomain.h"
#include "clockdomain.h"
#include "pm.h"

u32 enable_off_mode;

#ifdef CONFIG_SUSPEND
/*
 * omap_pm_suspend: points to a function that does the SoC-specific
 * suspend work
 */
static int (*omap_pm_suspend)(void);
#endif

#ifdef CONFIG_PM
/**
 * struct omap2_oscillator - Describe the board main oscillator latencies
 * @startup_time: oscillator startup latency
 * @shutdown_time: oscillator shutdown latency
 */
struct omap2_oscillator {
        u32 startup_time;
        u32 shutdown_time;
};

static struct omap2_oscillator oscillator = {
        .startup_time = ULONG_MAX,
        .shutdown_time = ULONG_MAX,
};

void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
{
        if (!tstart || !tshut)
                return;

        *tstart = oscillator.startup_time;
        *tshut = oscillator.shutdown_time;
}
#endif

int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
{
        clkdm_allow_idle(clkdm);
        return 0;
}

#ifdef CONFIG_SUSPEND
static int omap_pm_enter(suspend_state_t suspend_state)
{
        int ret = 0;

        if (!omap_pm_suspend)
                return -ENOENT; /* XXX doublecheck */

        switch (suspend_state) {
        case PM_SUSPEND_MEM:
                ret = omap_pm_suspend();
                break;
        default:
                ret = -EINVAL;
        }

        return ret;
}

static int omap_pm_begin(suspend_state_t state)
{
        cpu_idle_poll_ctrl(true);
        if (soc_is_omap34xx())
                omap_prcm_irq_prepare();
        return 0;
}

static void omap_pm_end(void)
{
        cpu_idle_poll_ctrl(false);
}

static void omap_pm_wake(void)
{
        if (soc_is_omap34xx())
                omap_prcm_irq_complete();
}

static const struct platform_suspend_ops omap_pm_ops = {
        .begin          = omap_pm_begin,
        .end            = omap_pm_end,
        .enter          = omap_pm_enter,
        .wake           = omap_pm_wake,
        .valid          = suspend_valid_only_mem,
};

/**
 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
 * @pm_suspend: function pointer to SoC specific suspend function
 */
void omap_common_suspend_init(void *pm_suspend)
{
        omap_pm_suspend = pm_suspend;
        suspend_set_ops(&omap_pm_ops);
}
#endif /* CONFIG_SUSPEND */

int __maybe_unused omap_pm_nop_init(void)
{
        return 0;
}

int (*omap_pm_soc_init)(void);

static int __init omap2_common_pm_late_init(void)
{
        int error;

        if (!omap_pm_soc_init)
                return 0;

        /* Init the voltage layer */
        omap3_twl_init();
        omap4_twl_init();
        omap4_cpcap_init();
        omap_voltage_late_init();

        /* Smartreflex device init */
        omap_devinit_smartreflex();

        error = omap_pm_soc_init();
        if (error)
                pr_warn("%s: pm soc init failed: %i\n", __func__, error);

        omap2_clk_enable_autoidle_all();

        return 0;
}
omap_late_initcall(omap2_common_pm_late_init);