s5p_mfc_pm.c

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/*
 * linux/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *      http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#ifdef CONFIG_PM_RUNTIME
#include <linux/pm_runtime.h>
#endif
#include "s5p_mfc_common.h"
#include "s5p_mfc_debug.h"
#include "s5p_mfc_pm.h"

#define MFC_GATE_CLK_NAME   "mfc"

#define CLK_DEBUG

static struct s5p_mfc_pm *pm;
static struct s5p_mfc_dev *p_dev;

#ifdef CLK_DEBUG
atomic_t clk_ref;
#endif

int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
{
    int ret = 0;

    pm = &dev->pm;
    p_dev = dev;
    pm->clock_gate = clk_get(&dev->plat_dev->dev, MFC_GATE_CLK_NAME);
    if (IS_ERR(pm->clock_gate)) {
        mfc_err("Failed to get clock-gating control\n");
        ret = PTR_ERR(pm->clock_gate);
        goto err_g_ip_clk;
    }

    ret = clk_prepare(pm->clock_gate);
    if (ret) {
        mfc_err("Failed to preapre clock-gating control\n");
        goto err_p_ip_clk;
    }

    pm->clock = clk_get(&dev->plat_dev->dev, dev->variant->mclk_name);
    if (IS_ERR(pm->clock)) {
        mfc_err("Failed to get MFC clock\n");
        ret = PTR_ERR(pm->clock);
        goto err_g_ip_clk_2;
    }

    ret = clk_prepare(pm->clock);
    if (ret) {
        mfc_err("Failed to prepare MFC clock\n");
        goto err_p_ip_clk_2;
    }

    atomic_set(&pm->power, 0);
#ifdef CONFIG_PM_RUNTIME
    pm->device = &dev->plat_dev->dev;
    pm_runtime_enable(pm->device);
#endif
#ifdef CLK_DEBUG
    atomic_set(&clk_ref, 0);
#endif
    return 0;
err_p_ip_clk_2:
    clk_put(pm->clock);
err_g_ip_clk_2:
    clk_unprepare(pm->clock_gate);
err_p_ip_clk:
    clk_put(pm->clock_gate);
err_g_ip_clk:
    return ret;
}

void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
{
    clk_unprepare(pm->clock_gate);
    clk_put(pm->clock_gate);
    clk_unprepare(pm->clock);
    clk_put(pm->clock);
#ifdef CONFIG_PM_RUNTIME
    pm_runtime_disable(pm->device);
#endif
}

int s5p_mfc_clock_on(void)
{
    int ret;
#ifdef CLK_DEBUG
    atomic_inc(&clk_ref);
    mfc_debug(3, "+ %d", atomic_read(&clk_ref));
#endif
    ret = clk_enable(pm->clock_gate);
    return ret;
}

void s5p_mfc_clock_off(void)
{
#ifdef CLK_DEBUG
    atomic_dec(&clk_ref);
    mfc_debug(3, "- %d", atomic_read(&clk_ref));
#endif
    clk_disable(pm->clock_gate);
}

int s5p_mfc_power_on(void)
{
#ifdef CONFIG_PM_RUNTIME
    return pm_runtime_get_sync(pm->device);
#else
    atomic_set(&pm->power, 1);
    return 0;
#endif
}

int s5p_mfc_power_off(void)
{
#ifdef CONFIG_PM_RUNTIME
    return pm_runtime_put_sync(pm->device);
#else
    atomic_set(&pm->power, 0);
    return 0;
#endif
}