drivers/gpio/mvgpio.c

   1 /*
   2  * (C) Copyright 2011
   3  * eInfochips Ltd. <www.einfochips.com>
   4  * Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
   5  *
   6  * (C) Copyright 2010
   7  * Marvell Semiconductor <www.marvell.com>
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  25  * MA 02110-1301 USA
  26  */
  27
  28 #include <common.h>
  29 #include <asm/io.h>
  30 #include <asm/errno.h>
  31 #include "mvgpio.h"
  32 #include <asm/gpio.h>
  33
  34 #ifndef MV_MAX_GPIO
  35 #define MV_MAX_GPIO     128
  36 #endif
  37
  38 int gpio_request(unsigned gpio, const char *label)
  39 {
  40         if (gpio >= MV_MAX_GPIO) {
  41                 printf("%s: Invalid GPIO requested %d\n", __func__, gpio);
  42                 return -1;
  43         }
  44         return 0;
  45 }
  46
  47 int gpio_free(unsigned gpio)
  48 {
  49         return 0;
  50 }
  51
  52 int gpio_direction_input(unsigned gpio)
  53 {
  54         struct gpio_reg *gpio_reg_bank;
  55
  56         if (gpio >= MV_MAX_GPIO) {
  57                 printf("%s: Invalid GPIO %d\n", __func__, gpio);
  58                 return -1;
  59         }
  60
  61         gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gpio));
  62         writel(GPIO_TO_BIT(gpio), &gpio_reg_bank->gcdr);
  63         return 0;
  64 }
  65
  66 int gpio_direction_output(unsigned gpio, int value)
  67 {
  68         struct gpio_reg *gpio_reg_bank;
  69
  70         if (gpio >= MV_MAX_GPIO) {
  71                 printf("%s: Invalid GPIO %d\n", __func__, gpio);
  72                 return -1;
  73         }
  74
  75         gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gpio));
  76         writel(GPIO_TO_BIT(gpio), &gpio_reg_bank->gsdr);
  77         gpio_set_value(gpio, value);
  78         return 0;
  79 }
  80
  81 int gpio_get_value(unsigned gpio)
  82 {
  83         struct gpio_reg *gpio_reg_bank;
  84         u32 gpio_val;
  85
  86         if (gpio >= MV_MAX_GPIO) {
  87                 printf("%s: Invalid GPIO %d\n", __func__, gpio);
  88                 return -1;
  89         }
  90
  91         gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gpio));
  92         gpio_val = readl(&gpio_reg_bank->gplr);
  93
  94         return GPIO_VAL(gpio, gpio_val);
  95 }
  96
  97 int gpio_set_value(unsigned gpio, int value)
  98 {
  99         struct gpio_reg *gpio_reg_bank;
 100
 101         if (gpio >= MV_MAX_GPIO) {
 102                 printf("%s: Invalid GPIO %d\n", __func__, gpio);
 103                 return -1;
 104         }
 105
 106         gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gpio));
 107         if (value)
 108                 writel(GPIO_TO_BIT(gpio), &gpio_reg_bank->gpsr);
 109         else
 110                 writel(GPIO_TO_BIT(gpio), &gpio_reg_bank->gpcr);
 111
 112         return 0;
 113 }