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 #include <linux/pm_runtime.h>
17 #include "s5p_mfc_common.h"
18 #include "s5p_mfc_debug.h"
19 #include "s5p_mfc_pm.h"
20
21 #define MFC_GATE_CLK_NAME "mfc"
22 #define MFC_SCLK_NAME "sclk_mfc"
23 #define MFC_SCLK_RATE (200 * 1000000)
24
25 #define CLK_DEBUG
26
27 static struct s5p_mfc_pm *pm;
28 static struct s5p_mfc_dev *p_dev;
29
30 #ifdef CLK_DEBUG
31 static atomic_t clk_ref;
32 #endif
33
s5p_mfc_init_pm(struct s5p_mfc_dev * dev)34 int 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 if (dev->variant->version != MFC_VERSION_V6) {
54 pm->clock = clk_get(&dev->plat_dev->dev, MFC_SCLK_NAME);
55 if (IS_ERR(pm->clock)) {
56 mfc_info("Failed to get MFC special clock control\n");
57 } else {
58 clk_set_rate(pm->clock, MFC_SCLK_RATE);
59 ret = clk_prepare_enable(pm->clock);
60 if (ret) {
61 mfc_err("Failed to enable MFC special clock\n");
62 goto err_s_clk;
63 }
64 }
65 }
66
67 atomic_set(&pm->power, 0);
68 #ifdef CONFIG_PM
69 pm->device = &dev->plat_dev->dev;
70 pm_runtime_enable(pm->device);
71 #endif
72 #ifdef CLK_DEBUG
73 atomic_set(&clk_ref, 0);
74 #endif
75 return 0;
76
77 err_s_clk:
78 clk_put(pm->clock);
79 err_p_ip_clk:
80 clk_put(pm->clock_gate);
81 err_g_ip_clk:
82 return ret;
83 }
84
s5p_mfc_final_pm(struct s5p_mfc_dev * dev)85 void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
86 {
87 if (dev->variant->version != MFC_VERSION_V6 &&
88 pm->clock) {
89 clk_disable_unprepare(pm->clock);
90 clk_put(pm->clock);
91 }
92 clk_unprepare(pm->clock_gate);
93 clk_put(pm->clock_gate);
94 #ifdef CONFIG_PM
95 pm_runtime_disable(pm->device);
96 #endif
97 }
98
s5p_mfc_clock_on(void)99 int s5p_mfc_clock_on(void)
100 {
101 int ret;
102 #ifdef CLK_DEBUG
103 atomic_inc(&clk_ref);
104 mfc_debug(3, "+ %d\n", atomic_read(&clk_ref));
105 #endif
106 ret = clk_enable(pm->clock_gate);
107 return ret;
108 }
109
s5p_mfc_clock_off(void)110 void s5p_mfc_clock_off(void)
111 {
112 #ifdef CLK_DEBUG
113 atomic_dec(&clk_ref);
114 mfc_debug(3, "- %d\n", atomic_read(&clk_ref));
115 #endif
116 clk_disable(pm->clock_gate);
117 }
118
s5p_mfc_power_on(void)119 int s5p_mfc_power_on(void)
120 {
121 #ifdef CONFIG_PM
122 return pm_runtime_get_sync(pm->device);
123 #else
124 atomic_set(&pm->power, 1);
125 return 0;
126 #endif
127 }
128
s5p_mfc_power_off(void)129 int s5p_mfc_power_off(void)
130 {
131 #ifdef CONFIG_PM
132 return pm_runtime_put_sync(pm->device);
133 #else
134 atomic_set(&pm->power, 0);
135 return 0;
136 #endif
137 }
138
139
140