arch/arm/mach-s3c2410/include/mach/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 /* These functions are in the to-be-removed category and it is strongly
  14  * encouraged not to use these in new code. They will be marked deprecated
  15  * very soon.
  16  *
  17  * Most of the functionality can be either replaced by the gpiocfg calls
  18  * for the s3c platform or by the generic GPIOlib API.
  19 */
  20
  21 /* external functions for GPIO support
  22  *
  23  * These allow various different clients to access the same GPIO
  24  * registers without conflicting. If your driver only owns the entire
  25  * GPIO register, then it is safe to ioremap/__raw_{read|write} to it.
  26 */
  27
  28 /* s3c2410_gpio_cfgpin
  29  *
  30  * set the configuration of the given pin to the value passed.
  31  *
  32  * eg:
  33  *    s3c2410_gpio_cfgpin(S3C2410_GPA(0), S3C2410_GPA0_ADDR0);
  34  *    s3c2410_gpio_cfgpin(S3C2410_GPE(8), S3C2410_GPE8_SDDAT1);
  35 */
  36
  37 extern void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function);
  38
  39 extern unsigned int s3c2410_gpio_getcfg(unsigned int pin);
  40
  41 /* s3c2410_gpio_getirq
  42  *
  43  * turn the given pin number into the corresponding IRQ number
  44  *
  45  * returns:
  46  *      < 0 = no interrupt for this pin
  47  *      >=0 = interrupt number for the pin
  48 */
  49
  50 extern int s3c2410_gpio_getirq(unsigned int pin);
  51
  52 #ifdef CONFIG_CPU_S3C2400
  53
  54 extern int s3c2400_gpio_getirq(unsigned int pin);
  55
  56 #endif /* CONFIG_CPU_S3C2400 */
  57
  58 /* s3c2410_gpio_irqfilter
  59  *
  60  * set the irq filtering on the given pin
  61  *
  62  * on = 0 => disable filtering
  63  *      1 => enable filtering
  64  *
  65  * config = S3C2410_EINTFLT_PCLK or S3C2410_EINTFLT_EXTCLK orred with
  66  *          width of filter (0 through 63)
  67  *
  68  *
  69 */
  70
  71 extern int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
  72                                   unsigned int config);
  73
  74 /* s3c2410_gpio_pullup
  75  *
  76  * configure the pull-up control on the given pin
  77  *
  78  * to = 1 => disable the pull-up
  79  *      0 => enable the pull-up
  80  *
  81  * eg;
  82  *
  83  *   s3c2410_gpio_pullup(S3C2410_GPB(0), 0);
  84  *   s3c2410_gpio_pullup(S3C2410_GPE(8), 0);
  85 */
  86
  87 extern void s3c2410_gpio_pullup(unsigned int pin, unsigned int to);
  88
  89 /* s3c2410_gpio_getpull
  90  *
  91  * Read the state of the pull-up on a given pin
  92  *
  93  * return:
  94  *      < 0 => error code
  95  *        0 => enabled
  96  *        1 => disabled
  97 */
  98
  99 extern int s3c2410_gpio_getpull(unsigned int pin);
 100
 101 extern void s3c2410_gpio_setpin(unsigned int pin, unsigned int to);
 102
 103 extern unsigned int s3c2410_gpio_getpin(unsigned int pin);