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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>
#include <linux/pm_runtime.h>
#include "s5p_mfc_common.h"
#include "s5p_mfc_debug.h"
#include "s5p_mfc_pm.h"
#define MFC_GATE_CLK_NAME "mfc"
#define MFC_SCLK_NAME "sclk_mfc"
static struct s5p_mfc_pm *pm;
static struct s5p_mfc_dev *p_dev;
static atomic_t clk_ref;
int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
{
int ret = 0;
pm = &dev->pm;
p_dev = dev;
pm->use_clock_gating = dev->variant->use_clock_gating;
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;
}
if (dev->variant->version != MFC_VERSION_V6) {
pm->clock = clk_get(&dev->plat_dev->dev, MFC_SCLK_NAME);
if (IS_ERR(pm->clock)) {
mfc_info("Failed to get MFC special clock control\n");
pm->clock = NULL;
}
}
pm->device = &dev->plat_dev->dev;
pm_runtime_enable(pm->device);
atomic_set(&clk_ref, 0);
return 0;
clk_put(pm->clock_gate);
pm->clock_gate = NULL;
err_g_ip_clk:
return ret;
}
void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
{
if (dev->variant->version != MFC_VERSION_V6 &&
pm->clock) {
clk_put(pm->clock);
pm->clock = NULL;
}
clk_put(pm->clock_gate);
pm->clock_gate = NULL;
pm_runtime_disable(pm->device);
}
int s5p_mfc_clock_on(void)
{
atomic_inc(&clk_ref);
mfc_debug(3, "+ %d\n", atomic_read(&clk_ref));
if (!pm->use_clock_gating)
return 0;
return clk_enable(pm->clock_gate);
}
void s5p_mfc_clock_off(void)
{
atomic_dec(&clk_ref);
mfc_debug(3, "- %d\n", atomic_read(&clk_ref));
if (!pm->use_clock_gating)
return;
clk_disable(pm->clock_gate);
}
int s5p_mfc_power_on(void)
{
int ret;
ret = pm_runtime_get_sync(pm->device);
if (ret)
return ret;
ret = clk_prepare_enable(pm->clock_gate);
if (ret)
goto err_pm;
if (pm->clock) {
ret = clk_prepare_enable(pm->clock);
if (ret)
goto err_gate;
}
if (pm->use_clock_gating)
clk_disable(pm->clock_gate);
return 0;
err_gate:
clk_disable_unprepare(pm->clock_gate);
err_pm:
pm_runtime_put_sync(pm->device);
return ret;
}
int s5p_mfc_power_off(void)
{
if (pm->clock)
clk_disable_unprepare(pm->clock);
if (pm->use_clock_gating)
clk_unprepare(pm->clock_gate);
else
clk_disable_unprepare(pm->clock_gate);
return pm_runtime_put_sync(pm->device);
}
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