target/linux/rdc-2.6/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 #define RDC3210_CFGREG_ADDR     0x0CF8
  19 #define RDC3210_CFGREG_DATA     0x0CFC
  20
  21 static unsigned int rdc_gpio_read(unsigned gpio)
  22 {
  23         unsigned int val;
  24
  25         val = 0x80000000 | (7 << 11) | ((gpio&0x20?0x84:0x48));
  26         outl(val, RDC3210_CFGREG_ADDR);
  27         udelay(10);
  28         val = inl(RDC3210_CFGREG_DATA);
  29         val |= (0x1 << (gpio & 0x1F));
  30         outl(val, RDC3210_CFGREG_DATA);
  31         udelay(10);
  32         val = 0x80000000 | (7 << 11) | ((gpio&0x20?0x88:0x4C));
  33         outl(val, RDC3210_CFGREG_ADDR);
  34         udelay(10);
  35         val = inl(RDC3210_CFGREG_DATA);
  36
  37         return val;
  38 }
  39
  40 static void rdc_gpio_write(unsigned int val)
  41 {
  42         if (val) {
  43                 outl(val, RDC3210_CFGREG_DATA);
  44                 udelay(10);
  45         }
  46 }
  47
  48 int rdc_gpio_get_value(unsigned gpio)
  49 {
  50         return (gpio>0x3A?-EINVAL:(int)rdc_gpio_read(gpio));
  51 }
  52 EXPORT_SYMBOL(rdc_gpio_get_value);
  53
  54 void rdc_gpio_set_value(unsigned gpio, int value)
  55 {
  56         unsigned int val;
  57
  58         if (gpio > 0x3A) return;
  59         val = rdc_gpio_read(gpio);
  60
  61         if (value)
  62                 val &= ~(0x1 << (gpio & 0x1F));
  63         else
  64                 val |= (0x1 << (gpio & 0x1F));
  65
  66         rdc_gpio_write(val);
  67 }
  68 EXPORT_SYMBOL(rdc_gpio_set_value);
  69
  70 int rdc_gpio_direction_input(unsigned gpio)
  71 {
  72         return 0;
  73 }
  74 EXPORT_SYMBOL(rdc_gpio_direction_input);
  75
  76 int rdc_gpio_direction_output(unsigned gpio, int value)
  77 {
  78         return 0;
  79 }
  80 EXPORT_SYMBOL(rdc_gpio_direction_output);
  81
  82