diff options
Diffstat (limited to 'arch/arm/plat-samsung/include/plat/gpio-core.h')
-rw-r--r-- | arch/arm/plat-samsung/include/plat/gpio-core.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/include/plat/gpio-core.h b/arch/arm/plat-samsung/include/plat/gpio-core.h new file mode 100644 index 00000000000..49ff406a706 --- /dev/null +++ b/arch/arm/plat-samsung/include/plat/gpio-core.h | |||
@@ -0,0 +1,137 @@ | |||
1 | /* linux/arch/arm/plat-s3c/include/plat/gpio-core.h | ||
2 | * | ||
3 | * Copyright 2008 Simtec Electronics | ||
4 | * http://armlinux.simtec.co.uk/ | ||
5 | * Ben Dooks <ben@simtec.co.uk> | ||
6 | * | ||
7 | * S3C Platform - GPIO core | ||
8 | * | ||
9 | * This program is free software; you can redistribute it and/or modify | ||
10 | * it under the terms of the GNU General Public License version 2 as | ||
11 | * published by the Free Software Foundation. | ||
12 | */ | ||
13 | |||
14 | #define GPIOCON_OFF (0x00) | ||
15 | #define GPIODAT_OFF (0x04) | ||
16 | |||
17 | #define con_4bit_shift(__off) ((__off) * 4) | ||
18 | |||
19 | /* Define the core gpiolib support functions that the s3c platforms may | ||
20 | * need to extend or change depending on the hardware and the s3c chip | ||
21 | * selected at build or found at run time. | ||
22 | * | ||
23 | * These definitions are not intended for driver inclusion, there is | ||
24 | * nothing here that should not live outside the platform and core | ||
25 | * specific code. | ||
26 | */ | ||
27 | |||
28 | struct s3c_gpio_chip; | ||
29 | |||
30 | /** | ||
31 | * struct s3c_gpio_pm - power management (suspend/resume) information | ||
32 | * @save: Routine to save the state of the GPIO block | ||
33 | * @resume: Routine to resume the GPIO block. | ||
34 | */ | ||
35 | struct s3c_gpio_pm { | ||
36 | void (*save)(struct s3c_gpio_chip *chip); | ||
37 | void (*resume)(struct s3c_gpio_chip *chip); | ||
38 | }; | ||
39 | |||
40 | struct s3c_gpio_cfg; | ||
41 | |||
42 | /** | ||
43 | * struct s3c_gpio_chip - wrapper for specific implementation of gpio | ||
44 | * @chip: The chip structure to be exported via gpiolib. | ||
45 | * @base: The base pointer to the gpio configuration registers. | ||
46 | * @config: special function and pull-resistor control information. | ||
47 | * @pm_save: Save information for suspend/resume support. | ||
48 | * | ||
49 | * This wrapper provides the necessary information for the Samsung | ||
50 | * specific gpios being registered with gpiolib. | ||
51 | */ | ||
52 | struct s3c_gpio_chip { | ||
53 | struct gpio_chip chip; | ||
54 | struct s3c_gpio_cfg *config; | ||
55 | struct s3c_gpio_pm *pm; | ||
56 | void __iomem *base; | ||
57 | #ifdef CONFIG_PM | ||
58 | u32 pm_save[4]; | ||
59 | #endif | ||
60 | }; | ||
61 | |||
62 | static inline struct s3c_gpio_chip *to_s3c_gpio(struct gpio_chip *gpc) | ||
63 | { | ||
64 | return container_of(gpc, struct s3c_gpio_chip, chip); | ||
65 | } | ||
66 | |||
67 | /** s3c_gpiolib_add() - add the s3c specific version of a gpio_chip. | ||
68 | * @chip: The chip to register | ||
69 | * | ||
70 | * This is a wrapper to gpiochip_add() that takes our specific gpio chip | ||
71 | * information and makes the necessary alterations for the platform and | ||
72 | * notes the information for use with the configuration systems and any | ||
73 | * other parts of the system. | ||
74 | */ | ||
75 | extern void s3c_gpiolib_add(struct s3c_gpio_chip *chip); | ||
76 | |||
77 | /* CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios | ||
78 | * for use with the configuration calls, and other parts of the s3c gpiolib | ||
79 | * support code. | ||
80 | * | ||
81 | * Not all s3c support code will need this, as some configurations of cpu | ||
82 | * may only support one or two different configuration options and have an | ||
83 | * easy gpio to s3c_gpio_chip mapping function. If this is the case, then | ||
84 | * the machine support file should provide its own s3c_gpiolib_getchip() | ||
85 | * and any other necessary functions. | ||
86 | */ | ||
87 | |||
88 | /** | ||
89 | * samsung_gpiolib_add_4bit_chips - 4bit single register GPIO config. | ||
90 | * @chip: The gpio chip that is being configured. | ||
91 | * @nr_chips: The no of chips (gpio ports) for the GPIO being configured. | ||
92 | * | ||
93 | * This helper deal with the GPIO cases where the control register has 4 bits | ||
94 | * of control per GPIO, generally in the form of: | ||
95 | * 0000 = Input | ||
96 | * 0001 = Output | ||
97 | * others = Special functions (dependant on bank) | ||
98 | * | ||
99 | * Note, since the code to deal with the case where there are two control | ||
100 | * registers instead of one, we do not have a seperate set of function | ||
101 | * (samsung_gpiolib_add_4bit2_chips)for each case. | ||
102 | */ | ||
103 | extern void samsung_gpiolib_add_4bit_chips(struct s3c_gpio_chip *chip, | ||
104 | int nr_chips); | ||
105 | extern void samsung_gpiolib_add_4bit2_chips(struct s3c_gpio_chip *chip, | ||
106 | int nr_chips); | ||
107 | |||
108 | extern void samsung_gpiolib_add_4bit(struct s3c_gpio_chip *chip); | ||
109 | extern void samsung_gpiolib_add_4bit2(struct s3c_gpio_chip *chip); | ||
110 | |||
111 | #ifdef CONFIG_S3C_GPIO_TRACK | ||
112 | extern struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END]; | ||
113 | |||
114 | static inline struct s3c_gpio_chip *s3c_gpiolib_getchip(unsigned int chip) | ||
115 | { | ||
116 | return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL; | ||
117 | } | ||
118 | #else | ||
119 | /* machine specific code should provide s3c_gpiolib_getchip */ | ||
120 | |||
121 | #include <mach/gpio-track.h> | ||
122 | |||
123 | static inline void s3c_gpiolib_track(struct s3c_gpio_chip *chip) { } | ||
124 | #endif | ||
125 | |||
126 | #ifdef CONFIG_PM | ||
127 | extern struct s3c_gpio_pm s3c_gpio_pm_1bit; | ||
128 | extern struct s3c_gpio_pm s3c_gpio_pm_2bit; | ||
129 | extern struct s3c_gpio_pm s3c_gpio_pm_4bit; | ||
130 | #define __gpio_pm(x) x | ||
131 | #else | ||
132 | #define s3c_gpio_pm_1bit NULL | ||
133 | #define s3c_gpio_pm_2bit NULL | ||
134 | #define s3c_gpio_pm_4bit NULL | ||
135 | #define __gpio_pm(x) NULL | ||
136 | |||
137 | #endif /* CONFIG_PM */ | ||