drivers/gpio/mxc_gpio.c

   1 /*
   2  * Copyright (C) 2009
   3  * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23 #include <common.h>
  24 #ifdef CONFIG_MX31
  25 #include <asm/arch/mx31-regs.h>
  26 #endif
  27 #ifdef CONFIG_MX51
  28 #include <asm/arch/imx-regs.h>
  29 #endif
  30 #include <asm/io.h>
  31 #include <mxc_gpio.h>
  32
  33 /* GPIO port description */
  34 static unsigned long gpio_ports[] = {
  35         [0] = GPIO1_BASE_ADDR,
  36         [1] = GPIO2_BASE_ADDR,
  37         [2] = GPIO3_BASE_ADDR,
  38 #ifdef CONFIG_MX51
  39         [3] = GPIO4_BASE_ADDR,
  40 #endif
  41 };
  42
  43 int mxc_gpio_direction(unsigned int gpio, enum mxc_gpio_direction direction)
  44 {
  45         unsigned int port = gpio >> 5;
  46         struct gpio_regs *regs;
  47         u32 l;
  48
  49         if (port >= ARRAY_SIZE(gpio_ports))
  50                 return 1;
  51
  52         gpio &= 0x1f;
  53
  54         regs = (struct gpio_regs *)gpio_ports[port];
  55
  56         l = readl(&regs->gpio_dir);
  57
  58         switch (direction) {
  59         case MXC_GPIO_DIRECTION_OUT:
  60                 l |= 1 << gpio;
  61                 break;
  62         case MXC_GPIO_DIRECTION_IN:
  63                 l &= ~(1 << gpio);
  64         }
  65         writel(l, &regs->gpio_dir);
  66
  67         return 0;
  68 }
  69
  70 void mxc_gpio_set(unsigned int gpio, unsigned int value)
  71 {
  72         unsigned int port = gpio >> 5;
  73         struct gpio_regs *regs;
  74         u32 l;
  75
  76         if (port >= ARRAY_SIZE(gpio_ports))
  77                 return;
  78
  79         gpio &= 0x1f;
  80
  81         regs = (struct gpio_regs *)gpio_ports[port];
  82
  83         l = readl(&regs->gpio_dr);
  84         if (value)
  85                 l |= 1 << gpio;
  86         else
  87                 l &= ~(1 << gpio);
  88         writel(l, &regs->gpio_dr);
  89 }
  90
  91 int mxc_gpio_get(unsigned int gpio)
  92 {
  93         unsigned int port = gpio >> 5;
  94         struct gpio_regs *regs;
  95         u32 l;
  96
  97         if (port >= ARRAY_SIZE(gpio_ports))
  98                 return -1;
  99
 100         gpio &= 0x1f;
 101
 102         regs = (struct gpio_regs *)gpio_ports[port];
 103
 104         l = (readl(&regs->gpio_dr) >> gpio) & 0x01;
 105
 106         return l;
 107 }