summaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-samsung/include/plat/gpio-cfg.h
blob: 34efdd2b032c718e94777a9286a8f0c4f41dd4d3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/* linux/arch/arm/plat-s3c/include/plat/gpio-cfg.h
 *
 * Copyright 2008 Openmoko, Inc.
 * Copyright 2008 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * S3C Platform - GPIO pin configuration
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

/* This file contains the necessary definitions to get the basic gpio
 * pin configuration done such as setting a pin to input or output or
 * changing the pull-{up,down} configurations.
 */

/* Note, this interface is being added to the s3c64xx arch first and will
 * be added to the s3c24xx systems later.
 */

#ifndef __PLAT_GPIO_CFG_H
#define __PLAT_GPIO_CFG_H __FILE__

typedef unsigned int __bitwise__ s3c_gpio_pull_t;
typedef unsigned int __bitwise__ s5p_gpio_drvstr_t;

/* forward declaration if gpio-core.h hasn't been included */
struct s3c_gpio_chip;

/**
 * struct s3c_gpio_cfg GPIO configuration
 * @cfg_eint: Configuration setting when used for external interrupt source
 * @get_pull: Read the current pull configuration for the GPIO
 * @set_pull: Set the current pull configuraiton for the GPIO
 * @set_config: Set the current configuration for the GPIO
 * @get_config: Read the current configuration for the GPIO
 *
 * Each chip can have more than one type of GPIO bank available and some
 * have different capabilites even when they have the same control register
 * layouts. Provide an point to vector control routine and provide any
 * per-bank configuration information that other systems such as the
 * external interrupt code will need.
 */
struct s3c_gpio_cfg {
	unsigned int	cfg_eint;

	s3c_gpio_pull_t	(*get_pull)(struct s3c_gpio_chip *chip, unsigned offs);
	int		(*set_pull)(struct s3c_gpio_chip *chip, unsigned offs,
				    s3c_gpio_pull_t pull);

	unsigned (*get_config)(struct s3c_gpio_chip *chip, unsigned offs);
	int	 (*set_config)(struct s3c_gpio_chip *chip, unsigned offs,
			       unsigned config);
};

#define S3C_GPIO_SPECIAL_MARK	(0xfffffff0)
#define S3C_GPIO_SPECIAL(x)	(S3C_GPIO_SPECIAL_MARK | (x))

/* Defines for generic pin configurations */
#define S3C_GPIO_INPUT	(S3C_GPIO_SPECIAL(0))
#define S3C_GPIO_OUTPUT	(S3C_GPIO_SPECIAL(1))
#define S3C_GPIO_SFN(x)	(S3C_GPIO_SPECIAL(x))

#define s3c_gpio_is_cfg_special(_cfg) \
	(((_cfg) & S3C_GPIO_SPECIAL_MARK) == S3C_GPIO_SPECIAL_MARK)

/**
 * s3c_gpio_cfgpin() - Change the GPIO function of a pin.
 * @pin pin The pin number to configure.
 * @pin to The configuration for the pin's function.
 *
 * Configure which function is actually connected to the external
 * pin, such as an gpio input, output or some form of special function
 * connected to an internal peripheral block.
 */
extern int s3c_gpio_cfgpin(unsigned int pin, unsigned int to);

/**
 * s3c_gpio_getcfg - Read the current function for a GPIO pin
 * @pin: The pin to read the configuration value for.
 *
 * Read the configuration state of the given @pin, returning a value that
 * could be passed back to s3c_gpio_cfgpin().
 *
 * @sa s3c_gpio_cfgpin
 */
extern unsigned s3c_gpio_getcfg(unsigned int pin);

/* Define values for the pull-{up,down} available for each gpio pin.
 *
 * These values control the state of the weak pull-{up,down} resistors
 * available on most pins on the S3C series. Not all chips support both
 * up or down settings, and it may be dependant on the chip that is being
 * used to whether the particular mode is available.
 */
#define S3C_GPIO_PULL_NONE	((__force s3c_gpio_pull_t)0x00)
#define S3C_GPIO_PULL_DOWN	((__force s3c_gpio_pull_t)0x01)
#define S3C_GPIO_PULL_UP	((__force s3c_gpio_pull_t)0x02)

/**
 * s3c_gpio_setpull() - set the state of a gpio pin pull resistor
 * @pin: The pin number to configure the pull resistor.
 * @pull: The configuration for the pull resistor.
 *
 * This function sets the state of the pull-{up,down} resistor for the
 * specified pin. It will return 0 if successfull, or a negative error
 * code if the pin cannot support the requested pull setting.
*/
extern int s3c_gpio_setpull(unsigned int pin, s3c_gpio_pull_t pull);

/**
 * s3c_gpio_getpull() - get the pull resistor state of a gpio pin
 * @pin: The pin number to get the settings for
 *
 * Read the pull resistor value for the specified pin.
*/
extern s3c_gpio_pull_t s3c_gpio_getpull(unsigned int pin);

/* Define values for the drvstr available for each gpio pin.
 *
 * These values control the value of the output signal driver strength,
 * configurable on most pins on the S5C series.
 */
#define S5P_GPIO_DRVSTR_LV1	((__force s5p_gpio_drvstr_t)0x00)
#define S5P_GPIO_DRVSTR_LV2	((__force s5p_gpio_drvstr_t)0x01)
#define S5P_GPIO_DRVSTR_LV3	((__force s5p_gpio_drvstr_t)0x10)
#define S5P_GPIO_DRVSTR_LV4	((__force s5p_gpio_drvstr_t)0x11)

/**
 * s5c_gpio_get_drvstr() - get the driver streght value of a gpio pin
 * @pin: The pin number to get the settings for
 *
 * Read the driver streght value for the specified pin.
*/
extern s5p_gpio_drvstr_t s5p_gpio_get_drvstr(unsigned int pin);

/**
 * s3c_gpio_set_drvstr() - set the driver streght value of a gpio pin
 * @pin: The pin number to configure the driver streght value
 * @drvstr: The new value of the driver strength
 *
 * This function sets the driver strength value for the specified pin.
 * It will return 0 if successfull, or a negative error code if the pin
 * cannot support the requested setting.
*/
extern int s5p_gpio_set_drvstr(unsigned int pin, s5p_gpio_drvstr_t drvstr);

#endif /* __PLAT_GPIO_CFG_H */
OpenPOWER on IntegriCloud