target/linux/rdc/files/arch/i386/mach-rdc/gpio.c

   1 /*
   2  *  Copyright (C) 2007, OpenWrt.org, Florian Fainelli <florian@openwrt.org>
   3  *      RDC321x architecture specific GPIO support
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  */
  10
  11 #include <linux/autoconf.h>
  12 #include <linux/init.h>
  13 #include <linux/io.h>
  14 #include <linux/types.h>
  15 #include <linux/module.h>
  16 #include <linux/delay.h>
  17
  18 #include <asm/mach-rdc/rdc321x_defs.h>
  19
  20 static inline int rdc_gpio_is_valid(unsigned gpio)
  21 {
  22         return (gpio <= RDC_MAX_GPIO);
  23 }
  24
  25 static unsigned int rdc_gpio_read(unsigned gpio)
  26 {
  27         unsigned int val;
  28
  29         val = 0x80000000 | (7 << 11) | ((gpio&0x20?0x84:0x48));
  30         outl(val, RDC3210_CFGREG_ADDR);
  31         udelay(10);
  32         val = inl(RDC3210_CFGREG_DATA);
  33         val |= (0x1 << (gpio & 0x1F));
  34         outl(val, RDC3210_CFGREG_DATA);
  35         udelay(10);
  36         val = 0x80000000 | (7 << 11) | ((gpio&0x20?0x88:0x4C));
  37         outl(val, RDC3210_CFGREG_ADDR);
  38         udelay(10);
  39         val = inl(RDC3210_CFGREG_DATA);
  40
  41         return val;
  42 }
  43
  44 static void rdc_gpio_write(unsigned int val)
  45 {
  46         if (val) {
  47                 outl(val, RDC3210_CFGREG_DATA);
  48                 udelay(10);
  49         }
  50 }
  51
  52 int rdc_gpio_get_value(unsigned gpio)
  53 {
  54         if (rdc_gpio_is_valid(gpio))
  55                 return (int)rdc_gpio_read(gpio);
  56         else
  57                 return -EINVAL;
  58 }
  59 EXPORT_SYMBOL(rdc_gpio_get_value);
  60
  61 void rdc_gpio_set_value(unsigned gpio, int value)
  62 {
  63         unsigned int val;
  64
  65         if (!rdc_gpio_is_valid(gpio))
  66                 return;
  67
  68         val = rdc_gpio_read(gpio);
  69
  70         if (value)
  71                 val &= ~(0x1 << (gpio & 0x1F));
  72         else
  73                 val |= (0x1 << (gpio & 0x1F));
  74
  75         rdc_gpio_write(val);
  76 }
  77 EXPORT_SYMBOL(rdc_gpio_set_value);
  78
  79 int rdc_gpio_direction_input(unsigned gpio)
  80 {
  81         return 0;
  82 }
  83 EXPORT_SYMBOL(rdc_gpio_direction_input);
  84
  85 int rdc_gpio_direction_output(unsigned gpio, int value)
  86 {
  87         return 0;
  88 }
  89 EXPORT_SYMBOL(rdc_gpio_direction_output);
  90
  91