s5p_mfc_pm.c revision fc906b6d189f26e869b11b94eaa9a733b3950740 
1/*
2 * linux/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c
3 *
4 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
5 *		http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13#include <linux/clk.h>
14#include <linux/err.h>
15#include <linux/platform_device.h>
16#ifdef CONFIG_PM_RUNTIME
17#include <linux/pm_runtime.h>
18#endif
19#include "s5p_mfc_common.h"
20#include "s5p_mfc_debug.h"
21#include "s5p_mfc_pm.h"
22
23#define MFC_GATE_CLK_NAME	"mfc"
24
25#define CLK_DEBUG
26
27static struct s5p_mfc_pm *pm;
28static struct s5p_mfc_dev *p_dev;
29
30#ifdef CLK_DEBUG
31static atomic_t clk_ref;
32#endif
33
34int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
35{
36	int ret = 0;
37
38	pm = &dev->pm;
39	p_dev = dev;
40	pm->clock_gate = clk_get(&dev->plat_dev->dev, MFC_GATE_CLK_NAME);
41	if (IS_ERR(pm->clock_gate)) {
42		mfc_err("Failed to get clock-gating control\n");
43		ret = PTR_ERR(pm->clock_gate);
44		goto err_g_ip_clk;
45	}
46
47	ret = clk_prepare(pm->clock_gate);
48	if (ret) {
49		mfc_err("Failed to prepare clock-gating control\n");
50		goto err_p_ip_clk;
51	}
52
53	atomic_set(&pm->power, 0);
54#ifdef CONFIG_PM_RUNTIME
55	pm->device = &dev->plat_dev->dev;
56	pm_runtime_enable(pm->device);
57#endif
58#ifdef CLK_DEBUG
59	atomic_set(&clk_ref, 0);
60#endif
61	return 0;
62err_p_ip_clk:
63	clk_put(pm->clock_gate);
64err_g_ip_clk:
65	return ret;
66}
67
68void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
69{
70	clk_unprepare(pm->clock_gate);
71	clk_put(pm->clock_gate);
72#ifdef CONFIG_PM_RUNTIME
73	pm_runtime_disable(pm->device);
74#endif
75}
76
77int s5p_mfc_clock_on(void)
78{
79	int ret;
80#ifdef CLK_DEBUG
81	atomic_inc(&clk_ref);
82	mfc_debug(3, "+ %d", atomic_read(&clk_ref));
83#endif
84	ret = clk_enable(pm->clock_gate);
85	return ret;
86}
87
88void s5p_mfc_clock_off(void)
89{
90#ifdef CLK_DEBUG
91	atomic_dec(&clk_ref);
92	mfc_debug(3, "- %d", atomic_read(&clk_ref));
93#endif
94	clk_disable(pm->clock_gate);
95}
96
97int s5p_mfc_power_on(void)
98{
99#ifdef CONFIG_PM_RUNTIME
100	return pm_runtime_get_sync(pm->device);
101#else
102	atomic_set(&pm->power, 1);
103	return 0;
104#endif
105}
106
107int s5p_mfc_power_off(void)
108{
109#ifdef CONFIG_PM_RUNTIME
110	return pm_runtime_put_sync(pm->device);
111#else
112	atomic_set(&pm->power, 0);
113	return 0;
114#endif
115}
116
117
118