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7db6c82a BD |
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 | ||
1f323cfd KK |
14 | #define GPIOCON_OFF (0x00) |
15 | #define GPIODAT_OFF (0x04) | |
16 | ||
17 | #define con_4bit_shift(__off) ((__off) * 4) | |
18 | ||
7db6c82a BD |
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 | ||
d87964c4 BD |
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 | ||
21b23664 BD |
40 | struct s3c_gpio_cfg; |
41 | ||
7db6c82a BD |
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. | |
21b23664 | 46 | * @config: special function and pull-resistor control information. |
d87964c4 | 47 | * @pm_save: Save information for suspend/resume support. |
7db6c82a BD |
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; | |
21b23664 | 54 | struct s3c_gpio_cfg *config; |
d87964c4 | 55 | struct s3c_gpio_pm *pm; |
7db6c82a | 56 | void __iomem *base; |
d87964c4 BD |
57 | #ifdef CONFIG_PM |
58 | u32 pm_save[4]; | |
59 | #endif | |
7db6c82a BD |
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); | |
8a53bdb9 | 76 | |
8a53bdb9 BD |
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 | ||
1f323cfd KK |
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 | ||
8a53bdb9 BD |
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 | { | |
21b23664 | 116 | return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL; |
8a53bdb9 BD |
117 | } |
118 | #else | |
21b23664 BD |
119 | /* machine specific code should provide s3c_gpiolib_getchip */ |
120 | ||
e856bb1f BD |
121 | #include <mach/gpio-track.h> |
122 | ||
8a53bdb9 BD |
123 | static inline void s3c_gpiolib_track(struct s3c_gpio_chip *chip) { } |
124 | #endif | |
d87964c4 BD |
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 */ |