diff options
Diffstat (limited to 'arch/arm/mach-omap1/pm_bus.c')
-rw-r--r-- | arch/arm/mach-omap1/pm_bus.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/pm_bus.c b/arch/arm/mach-omap1/pm_bus.c new file mode 100644 index 000000000000..8b66392be745 --- /dev/null +++ b/arch/arm/mach-omap1/pm_bus.c | |||
@@ -0,0 +1,98 @@ | |||
1 | /* | ||
2 | * Runtime PM support code for OMAP1 | ||
3 | * | ||
4 | * Author: Kevin Hilman, Deep Root Systems, LLC | ||
5 | * | ||
6 | * Copyright (C) 2010 Texas Instruments, Inc. | ||
7 | * | ||
8 | * This file is licensed under the terms of the GNU General Public | ||
9 | * License version 2. This program is licensed "as is" without any | ||
10 | * warranty of any kind, whether express or implied. | ||
11 | */ | ||
12 | #include <linux/init.h> | ||
13 | #include <linux/kernel.h> | ||
14 | #include <linux/io.h> | ||
15 | #include <linux/pm_runtime.h> | ||
16 | #include <linux/platform_device.h> | ||
17 | #include <linux/mutex.h> | ||
18 | #include <linux/clk.h> | ||
19 | #include <linux/err.h> | ||
20 | |||
21 | #include <plat/omap_device.h> | ||
22 | #include <plat/omap-pm.h> | ||
23 | |||
24 | #ifdef CONFIG_PM_RUNTIME | ||
25 | static int omap1_pm_runtime_suspend(struct device *dev) | ||
26 | { | ||
27 | struct clk *iclk, *fclk; | ||
28 | int ret = 0; | ||
29 | |||
30 | dev_dbg(dev, "%s\n", __func__); | ||
31 | |||
32 | ret = pm_generic_runtime_suspend(dev); | ||
33 | |||
34 | fclk = clk_get(dev, "fck"); | ||
35 | if (!IS_ERR(fclk)) { | ||
36 | clk_disable(fclk); | ||
37 | clk_put(fclk); | ||
38 | } | ||
39 | |||
40 | iclk = clk_get(dev, "ick"); | ||
41 | if (!IS_ERR(iclk)) { | ||
42 | clk_disable(iclk); | ||
43 | clk_put(iclk); | ||
44 | } | ||
45 | |||
46 | return 0; | ||
47 | }; | ||
48 | |||
49 | static int omap1_pm_runtime_resume(struct device *dev) | ||
50 | { | ||
51 | int ret = 0; | ||
52 | struct clk *iclk, *fclk; | ||
53 | |||
54 | dev_dbg(dev, "%s\n", __func__); | ||
55 | |||
56 | iclk = clk_get(dev, "ick"); | ||
57 | if (!IS_ERR(iclk)) { | ||
58 | clk_enable(iclk); | ||
59 | clk_put(iclk); | ||
60 | } | ||
61 | |||
62 | fclk = clk_get(dev, "fck"); | ||
63 | if (!IS_ERR(fclk)) { | ||
64 | clk_enable(fclk); | ||
65 | clk_put(fclk); | ||
66 | } | ||
67 | |||
68 | return pm_generic_runtime_resume(dev); | ||
69 | }; | ||
70 | |||
71 | static int __init omap1_pm_runtime_init(void) | ||
72 | { | ||
73 | const struct dev_pm_ops *pm; | ||
74 | struct dev_pm_ops *omap_pm; | ||
75 | |||
76 | pm = platform_bus_get_pm_ops(); | ||
77 | if (!pm) { | ||
78 | pr_err("%s: unable to get dev_pm_ops from platform_bus\n", | ||
79 | __func__); | ||
80 | return -ENODEV; | ||
81 | } | ||
82 | |||
83 | omap_pm = kmemdup(pm, sizeof(struct dev_pm_ops), GFP_KERNEL); | ||
84 | if (!omap_pm) { | ||
85 | pr_err("%s: unable to alloc memory for new dev_pm_ops\n", | ||
86 | __func__); | ||
87 | return -ENOMEM; | ||
88 | } | ||
89 | |||
90 | omap_pm->runtime_suspend = omap1_pm_runtime_suspend; | ||
91 | omap_pm->runtime_resume = omap1_pm_runtime_resume; | ||
92 | |||
93 | platform_bus_set_pm_ops(omap_pm); | ||
94 | |||
95 | return 0; | ||
96 | } | ||
97 | core_initcall(omap1_pm_runtime_init); | ||
98 | #endif /* CONFIG_PM_RUNTIME */ | ||