blob: 6801c85fb9dac46a4aeb85cd20be7dde3e1a5149 (
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
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright 2008 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* S3C Platform - GPIO core
*/
#ifndef __PLAT_SAMSUNG_GPIO_CORE_H
#define __PLAT_SAMSUNG_GPIO_CORE_H
/* Bring in machine-local definitions, especially S3C_GPIO_END */
#include "gpio-samsung.h"
#include <linux/gpio/driver.h>
#define GPIOCON_OFF (0x00)
#define GPIODAT_OFF (0x04)
#define con_4bit_shift(__off) ((__off) * 4)
/* Define the core gpiolib support functions that the s3c platforms may
* need to extend or change depending on the hardware and the s3c chip
* selected at build or found at run time.
*
* These definitions are not intended for driver inclusion, there is
* nothing here that should not live outside the platform and core
* specific code.
*/
struct samsung_gpio_chip;
/**
* struct samsung_gpio_pm - power management (suspend/resume) information
* @save: Routine to save the state of the GPIO block
* @resume: Routine to resume the GPIO block.
*/
struct samsung_gpio_pm {
void (*save)(struct samsung_gpio_chip *chip);
void (*resume)(struct samsung_gpio_chip *chip);
};
struct samsung_gpio_cfg;
/**
* struct samsung_gpio_chip - wrapper for specific implementation of gpio
* @chip: The chip structure to be exported via gpiolib.
* @base: The base pointer to the gpio configuration registers.
* @group: The group register number for gpio interrupt support.
* @irq_base: The base irq number.
* @config: special function and pull-resistor control information.
* @lock: Lock for exclusive access to this gpio bank.
* @pm_save: Save information for suspend/resume support.
* @bitmap_gpio_int: Bitmap for representing GPIO interrupt or not.
*
* This wrapper provides the necessary information for the Samsung
* specific gpios being registered with gpiolib.
*
* The lock protects each gpio bank from multiple access of the shared
* configuration registers, or from reading of data whilst another thread
* is writing to the register set.
*
* Each chip has its own lock to avoid any contention between different
* CPU cores trying to get one lock for different GPIO banks, where each
* bank of GPIO has its own register space and configuration registers.
*/
struct samsung_gpio_chip {
struct gpio_chip chip;
struct samsung_gpio_cfg *config;
struct samsung_gpio_pm *pm;
void __iomem *base;
int irq_base;
int group;
spinlock_t lock;
#ifdef CONFIG_PM
u32 pm_save[4];
#endif
u32 bitmap_gpio_int;
};
static inline struct samsung_gpio_chip *to_samsung_gpio(struct gpio_chip *gpc)
{
return container_of(gpc, struct samsung_gpio_chip, chip);
}
/**
* samsung_gpiolib_to_irq - convert gpio pin to irq number
* @chip: The gpio chip that the pin belongs to.
* @offset: The offset of the pin in the chip.
*
* This helper returns the irq number calculated from the chip->irq_base and
* the provided offset.
*/
extern int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset);
#ifdef CONFIG_S3C_GPIO_TRACK
extern struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END];
static inline struct samsung_gpio_chip *samsung_gpiolib_getchip(unsigned int chip)
{
return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL;
}
#else
/* machine specific code should provide samsung_gpiolib_getchip */
extern struct samsung_gpio_chip s3c24xx_gpios[];
static inline struct samsung_gpio_chip *samsung_gpiolib_getchip(unsigned int pin)
{
struct samsung_gpio_chip *chip;
if (pin > S3C_GPIO_END)
return NULL;
chip = &s3c24xx_gpios[pin/32];
return ((pin - chip->chip.base) < chip->chip.ngpio) ? chip : NULL;
}
static inline void s3c_gpiolib_track(struct samsung_gpio_chip *chip) { }
#endif
#ifdef CONFIG_PM
extern struct samsung_gpio_pm samsung_gpio_pm_1bit;
extern struct samsung_gpio_pm samsung_gpio_pm_2bit;
extern struct samsung_gpio_pm samsung_gpio_pm_4bit;
#define __gpio_pm(x) x
#else
#define samsung_gpio_pm_1bit NULL
#define samsung_gpio_pm_2bit NULL
#define samsung_gpio_pm_4bit NULL
#define __gpio_pm(x) NULL
#endif /* CONFIG_PM */
/* locking wrappers to deal with multiple access to the same gpio bank */
#define samsung_gpio_lock(_oc, _fl) spin_lock_irqsave(&(_oc)->lock, _fl)
#define samsung_gpio_unlock(_oc, _fl) spin_unlock_irqrestore(&(_oc)->lock, _fl)
#endif /* __PLAT_SAMSUNG_GPIO_CORE_H */
|
