diff options
Diffstat (limited to 'drivers/media/video/s5p-mfc/s5p_mfc_pm.c')
-rw-r--r-- | drivers/media/video/s5p-mfc/s5p_mfc_pm.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/media/video/s5p-mfc/s5p_mfc_pm.c b/drivers/media/video/s5p-mfc/s5p_mfc_pm.c new file mode 100644 index 00000000000..f6a3035c4fb --- /dev/null +++ b/drivers/media/video/s5p-mfc/s5p_mfc_pm.c | |||
@@ -0,0 +1,117 @@ | |||
1 | /* | ||
2 | * linux/drivers/media/video/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_CLKNAME "sclk_mfc" | ||
24 | #define MFC_GATE_CLK_NAME "mfc" | ||
25 | |||
26 | #define CLK_DEBUG | ||
27 | |||
28 | static struct s5p_mfc_pm *pm; | ||
29 | static struct s5p_mfc_dev *p_dev; | ||
30 | |||
31 | #ifdef CLK_DEBUG | ||
32 | atomic_t clk_ref; | ||
33 | #endif | ||
34 | |||
35 | int s5p_mfc_init_pm(struct s5p_mfc_dev *dev) | ||
36 | { | ||
37 | int ret = 0; | ||
38 | |||
39 | pm = &dev->pm; | ||
40 | p_dev = dev; | ||
41 | pm->clock_gate = clk_get(&dev->plat_dev->dev, MFC_GATE_CLK_NAME); | ||
42 | if (IS_ERR(pm->clock_gate)) { | ||
43 | mfc_err("Failed to get clock-gating control\n"); | ||
44 | ret = -ENOENT; | ||
45 | goto err_g_ip_clk; | ||
46 | } | ||
47 | pm->clock = clk_get(&dev->plat_dev->dev, MFC_CLKNAME); | ||
48 | if (IS_ERR(pm->clock)) { | ||
49 | mfc_err("Failed to get MFC clock\n"); | ||
50 | ret = -ENOENT; | ||
51 | goto err_g_ip_clk_2; | ||
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; | ||
62 | err_g_ip_clk_2: | ||
63 | clk_put(pm->clock_gate); | ||
64 | err_g_ip_clk: | ||
65 | return ret; | ||
66 | } | ||
67 | |||
68 | void s5p_mfc_final_pm(struct s5p_mfc_dev *dev) | ||
69 | { | ||
70 | clk_put(pm->clock_gate); | ||
71 | clk_put(pm->clock); | ||
72 | #ifdef CONFIG_PM_RUNTIME | ||
73 | pm_runtime_disable(pm->device); | ||
74 | #endif | ||
75 | } | ||
76 | |||
77 | int 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 | |||
88 | void 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 | |||
97 | int 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 | |||
107 | int 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 | |||