arch/arm/plat-samsung/include/plat/gpio-fns.h

   1 /* arch/arm/mach-s3c2410/include/mach/gpio-fns.h
   2  *
   3  * Copyright (c) 2003-2009 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * S3C2410 - hardware
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #ifndef __MACH_GPIO_FNS_H
  14 #define __MACH_GPIO_FNS_H __FILE__
  15
  16 /* These functions are in the to-be-removed category and it is strongly
  17  * encouraged not to use these in new code. They will be marked deprecated
  18  * very soon.
  19  *
  20  * Most of the functionality can be either replaced by the gpiocfg calls
  21  * for the s3c platform or by the generic GPIOlib API.
  22  *
  23  * As of 2.6.35-rc, these will be removed, with the few drivers using them
  24  * either replaced or given a wrapper until the calls can be removed.
  25 */
  26
  27 #include <plat/gpio-cfg.h>
  28
  29 static inline void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int cfg)
  30 {
  31         /* 1:1 mapping between cfgpin and setcfg calls at the moment */
  32         s3c_gpio_cfgpin(pin, cfg);
  33 }
  34
  35 /* external functions for GPIO support
  36  *
  37  * These allow various different clients to access the same GPIO
  38  * registers without conflicting. If your driver only owns the entire
  39  * GPIO register, then it is safe to ioremap/__raw_{read|write} to it.
  40 */
  41
  42 extern unsigned int s3c2410_gpio_getcfg(unsigned int pin);
  43
  44 /* s3c2410_gpio_getirq
  45  *
  46  * turn the given pin number into the corresponding IRQ number
  47  *
  48  * returns:
  49  *      < 0 = no interrupt for this pin
  50  *      >=0 = interrupt number for the pin
  51 */
  52
  53 extern int s3c2410_gpio_getirq(unsigned int pin);
  54
  55 /* s3c2410_gpio_irqfilter
  56  *
  57  * set the irq filtering on the given pin
  58  *
  59  * on = 0 => disable filtering
  60  *      1 => enable filtering
  61  *
  62  * config = S3C2410_EINTFLT_PCLK or S3C2410_EINTFLT_EXTCLK orred with
  63  *          width of filter (0 through 63)
  64  *
  65  *
  66 */
  67
  68 extern int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
  69                                   unsigned int config);
  70
  71 /* s3c2410_gpio_pullup
  72  *
  73  * This call should be replaced with s3c_gpio_setpull().
  74  *
  75  * As a note, there is currently no distinction between pull-up and pull-down
  76  * in the s3c24xx series devices with only an on/off configuration.
  77  */
  78
  79 /* s3c2410_gpio_pullup
  80  *
  81  * configure the pull-up control on the given pin
  82  *
  83  * to = 1 => disable the pull-up
  84  *      0 => enable the pull-up
  85  *
  86  * eg;
  87  *
  88  *   s3c2410_gpio_pullup(S3C2410_GPB(0), 0);
  89  *   s3c2410_gpio_pullup(S3C2410_GPE(8), 0);
  90 */
  91
  92 extern void s3c2410_gpio_pullup(unsigned int pin, unsigned int to);
  93
  94 extern void s3c2410_gpio_setpin(unsigned int pin, unsigned int to);
  95
  96 extern unsigned int s3c2410_gpio_getpin(unsigned int pin);
  97
  98 #endif /* __MACH_GPIO_FNS_H */