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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"
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 i;
pm = &dev->pm;
p_dev = dev;
pm->num_clocks = dev->variant->num_clocks;
pm->clk_names = dev->variant->clk_names;
pm->device = &dev->plat_dev->dev;
pm->clock_gate = NULL;
/* clock control */
for (i = 0; i < pm->num_clocks; i++) {
pm->clocks[i] = devm_clk_get(pm->device, pm->clk_names[i]);
if (IS_ERR(pm->clocks[i])) {
/* additional clocks are optional */
if (i && PTR_ERR(pm->clocks[i]) == -ENOENT) {
pm->clocks[i] = NULL;
continue;
}
mfc_err("Failed to get clock: %s\n",
pm->clk_names[i]);
return PTR_ERR(pm->clocks[i]);
}
}
if (dev->variant->use_clock_gating)
pm->clock_gate = pm->clocks[0];
pm_runtime_enable(pm->device);
atomic_set(&clk_ref, 0);
return 0;
}
void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
{
pm_runtime_disable(pm->device);
}
int s5p_mfc_clock_on(void)
{
atomic_inc(&clk_ref);
mfc_debug(3, "+ %d\n", atomic_read(&clk_ref));
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));
clk_disable(pm->clock_gate);
}
int s5p_mfc_power_on(void)
{
int i, ret = 0;
ret = pm_runtime_get_sync(pm->device);
if (ret < 0) {
pm_runtime_put_noidle(pm->device);
return ret;
}
/* clock control */
for (i = 0; i < pm->num_clocks; i++) {
ret = clk_prepare_enable(pm->clocks[i]);
if (ret < 0) {
mfc_err("clock prepare failed for clock: %s\n",
pm->clk_names[i]);
i++;
goto err;
}
}
/* prepare for software clock gating */
clk_disable(pm->clock_gate);
return 0;
err:
while (--i > 0)
clk_disable_unprepare(pm->clocks[i]);
pm_runtime_put(pm->device);
return ret;
}
int s5p_mfc_power_off(void)
{
int i;
/* finish software clock gating */
clk_enable(pm->clock_gate);
for (i = 0; i < pm->num_clocks; i++)
clk_disable_unprepare(pm->clocks[i]);
return pm_runtime_put_sync(pm->device);
}
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