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Diffstat (limited to 'arch/arm/mach-msm/gpiomux.h')
-rw-r--r-- | arch/arm/mach-msm/gpiomux.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/gpiomux.h b/arch/arm/mach-msm/gpiomux.h new file mode 100644 index 000000000000..b178d9cb742f --- /dev/null +++ b/arch/arm/mach-msm/gpiomux.h | |||
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1 | /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. | ||
2 | * | ||
3 | * This program is free software; you can redistribute it and/or modify | ||
4 | * it under the terms of the GNU General Public License version 2 and | ||
5 | * only version 2 as published by the Free Software Foundation. | ||
6 | * | ||
7 | * This program is distributed in the hope that it will be useful, | ||
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
10 | * GNU General Public License for more details. | ||
11 | * | ||
12 | * You should have received a copy of the GNU General Public License | ||
13 | * along with this program; if not, write to the Free Software | ||
14 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | ||
15 | * 02110-1301, USA. | ||
16 | */ | ||
17 | #ifndef __ARCH_ARM_MACH_MSM_GPIOMUX_H | ||
18 | #define __ARCH_ARM_MACH_MSM_GPIOMUX_H | ||
19 | |||
20 | #include <linux/bitops.h> | ||
21 | #include <linux/errno.h> | ||
22 | |||
23 | #if defined(CONFIG_MSM_V2_TLMM) | ||
24 | #include "gpiomux-v2.h" | ||
25 | #else | ||
26 | #include "gpiomux-v1.h" | ||
27 | #endif | ||
28 | |||
29 | /** | ||
30 | * struct msm_gpiomux_config: gpiomux settings for one gpio line. | ||
31 | * | ||
32 | * A complete gpiomux config is the bitwise-or of a drive-strength, | ||
33 | * function, and pull. For functions other than GPIO, the OE | ||
34 | * is hard-wired according to the function. For GPIO mode, | ||
35 | * OE is controlled by gpiolib. | ||
36 | * | ||
37 | * Available settings differ by target; see the gpiomux header | ||
38 | * specific to your target arch for available configurations. | ||
39 | * | ||
40 | * @active: The configuration to be installed when the line is | ||
41 | * active, or its reference count is > 0. | ||
42 | * @suspended: The configuration to be installed when the line | ||
43 | * is suspended, or its reference count is 0. | ||
44 | * @ref: The reference count of the line. For internal use of | ||
45 | * the gpiomux framework only. | ||
46 | */ | ||
47 | struct msm_gpiomux_config { | ||
48 | gpiomux_config_t active; | ||
49 | gpiomux_config_t suspended; | ||
50 | unsigned ref; | ||
51 | }; | ||
52 | |||
53 | /** | ||
54 | * @GPIOMUX_VALID: If set, the config field contains 'good data'. | ||
55 | * The absence of this bit will prevent the gpiomux | ||
56 | * system from applying the configuration under all | ||
57 | * circumstances. | ||
58 | */ | ||
59 | enum { | ||
60 | GPIOMUX_VALID = BIT(sizeof(gpiomux_config_t) * BITS_PER_BYTE - 1), | ||
61 | GPIOMUX_CTL_MASK = GPIOMUX_VALID, | ||
62 | }; | ||
63 | |||
64 | #ifdef CONFIG_MSM_GPIOMUX | ||
65 | |||
66 | /* Each architecture must provide its own instance of this table. | ||
67 | * To avoid having gpiomux manage any given gpio, one or both of | ||
68 | * the entries can avoid setting GPIOMUX_VALID - the absence | ||
69 | * of that flag will prevent the configuration from being applied | ||
70 | * during state transitions. | ||
71 | */ | ||
72 | extern struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS]; | ||
73 | |||
74 | /* Increment a gpio's reference count, possibly activating the line. */ | ||
75 | int __must_check msm_gpiomux_get(unsigned gpio); | ||
76 | |||
77 | /* Decrement a gpio's reference count, possibly suspending the line. */ | ||
78 | int msm_gpiomux_put(unsigned gpio); | ||
79 | |||
80 | /* Install a new configuration to the gpio line. To avoid overwriting | ||
81 | * a configuration, leave the VALID bit out. | ||
82 | */ | ||
83 | int msm_gpiomux_write(unsigned gpio, | ||
84 | gpiomux_config_t active, | ||
85 | gpiomux_config_t suspended); | ||
86 | |||
87 | /* Architecture-internal function for use by the framework only. | ||
88 | * This function can assume the following: | ||
89 | * - the gpio value has passed a bounds-check | ||
90 | * - the gpiomux spinlock has been obtained | ||
91 | * | ||
92 | * This function is not for public consumption. External users | ||
93 | * should use msm_gpiomux_write. | ||
94 | */ | ||
95 | void __msm_gpiomux_write(unsigned gpio, gpiomux_config_t val); | ||
96 | #else | ||
97 | static inline int __must_check msm_gpiomux_get(unsigned gpio) | ||
98 | { | ||
99 | return -ENOSYS; | ||
100 | } | ||
101 | |||
102 | static inline int msm_gpiomux_put(unsigned gpio) | ||
103 | { | ||
104 | return -ENOSYS; | ||
105 | } | ||
106 | |||
107 | static inline int msm_gpiomux_write(unsigned gpio, | ||
108 | gpiomux_config_t active, | ||
109 | gpiomux_config_t suspended) | ||
110 | { | ||
111 | return -ENOSYS; | ||
112 | } | ||
113 | #endif | ||
114 | #endif | ||