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gpio-core.h
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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 <[email protected]>
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 samsung_gpio_chip;
29 
38 };
39 
40 struct samsung_gpio_cfg;
41 
64  struct gpio_chip chip;
67  void __iomem *base;
68  int irq_base;
69  int group;
71 #ifdef CONFIG_PM
72  u32 pm_save[4];
73 #endif
74 };
75 
76 static inline struct samsung_gpio_chip *to_samsung_gpio(struct gpio_chip *gpc)
77 {
78  return container_of(gpc, struct samsung_gpio_chip, chip);
79 }
80 
89 extern int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset);
90 
91 /* exported for core SoC support to change */
93 
94 #ifdef CONFIG_S3C_GPIO_TRACK
95 extern struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END];
96 
97 static inline struct samsung_gpio_chip *samsung_gpiolib_getchip(unsigned int chip)
98 {
99  return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL;
100 }
101 #else
102 /* machine specific code should provide samsung_gpiolib_getchip */
103 
104 #include <mach/gpio-track.h>
105 
106 static inline void s3c_gpiolib_track(struct samsung_gpio_chip *chip) { }
107 #endif
108 
109 #ifdef CONFIG_PM
113 #define __gpio_pm(x) x
114 #else
115 #define samsung_gpio_pm_1bit NULL
116 #define samsung_gpio_pm_2bit NULL
117 #define samsung_gpio_pm_4bit NULL
118 #define __gpio_pm(x) NULL
119 
120 #endif /* CONFIG_PM */
121 
122 /* locking wrappers to deal with multiple access to the same gpio bank */
123 #define samsung_gpio_lock(_oc, _fl) spin_lock_irqsave(&(_oc)->lock, _fl)
124 #define samsung_gpio_unlock(_oc, _fl) spin_unlock_irqrestore(&(_oc)->lock, _fl)