drivers/gpio/kw_gpio.c

   1 /*
   2  * arch/arm/plat-orion/gpio.c
   3  *
   4  * Marvell Orion SoC GPIO handling.
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  22  * MA 02110-1301 USA
  23  */
  24
  25 /*
  26  * Based on (mostly copied from) plat-orion based Linux 2.6 kernel driver.
  27  * Removed orion_gpiochip struct and kernel level irq handling.
  28  *
  29  * Dieter Kiermaier dk-arm-linux@gmx.de
  30  */
  31
  32 #include <common.h>
  33 #include <asm/bitops.h>
  34 #include <asm/arch/kirkwood.h>
  35 #include <asm/arch/gpio.h>
  36
  37 static unsigned long gpio_valid_input[BITS_TO_LONGS(GPIO_MAX)];
  38 static unsigned long gpio_valid_output[BITS_TO_LONGS(GPIO_MAX)];
  39
  40 void __set_direction(unsigned pin, int input)
  41 {
  42         u32 u;
  43
  44         u = readl(GPIO_IO_CONF(pin));
  45         if (input)
  46                 u |= 1 << (pin & 31);
  47         else
  48                 u &= ~(1 << (pin & 31));
  49         writel(u, GPIO_IO_CONF(pin));
  50
  51         u = readl(GPIO_IO_CONF(pin));
  52 }
  53
  54 void __set_level(unsigned pin, int high)
  55 {
  56         u32 u;
  57
  58         u = readl(GPIO_OUT(pin));
  59         if (high)
  60                 u |= 1 << (pin & 31);
  61         else
  62                 u &= ~(1 << (pin & 31));
  63         writel(u, GPIO_OUT(pin));
  64 }
  65
  66 void __set_blinking(unsigned pin, int blink)
  67 {
  68         u32 u;
  69
  70         u = readl(GPIO_BLINK_EN(pin));
  71         if (blink)
  72                 u |= 1 << (pin & 31);
  73         else
  74                 u &= ~(1 << (pin & 31));
  75         writel(u, GPIO_BLINK_EN(pin));
  76 }
  77
  78 int kw_gpio_is_valid(unsigned pin, int mode)
  79 {
  80         if (pin < GPIO_MAX) {
  81                 if ((mode & GPIO_INPUT_OK) && !test_bit(pin, gpio_valid_input))
  82                         goto err_out;
  83
  84                 if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, gpio_valid_output))
  85                         goto err_out;
  86                 return 0;
  87         }
  88
  89 err_out:
  90                 printf("%s: invalid GPIO %d\n", __func__, pin);
  91         return 1;
  92 }
  93
  94 void kw_gpio_set_valid(unsigned pin, int mode)
  95 {
  96         if (mode == 1)
  97                 mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK;
  98         if (mode & GPIO_INPUT_OK)
  99                 __set_bit(pin, gpio_valid_input);
 100         else
 101                 __clear_bit(pin, gpio_valid_input);
 102         if (mode & GPIO_OUTPUT_OK)
 103                 __set_bit(pin, gpio_valid_output);
 104         else
 105                 __clear_bit(pin, gpio_valid_output);
 106 }
 107 /*
 108  * GENERIC_GPIO primitives.
 109  */
 110 int kw_gpio_direction_input(unsigned pin)
 111 {
 112         if (!kw_gpio_is_valid(pin, GPIO_INPUT_OK))
 113                 return 1;
 114
 115         /* Configure GPIO direction. */
 116         __set_direction(pin, 1);
 117
 118         return 0;
 119 }
 120
 121 int kw_gpio_direction_output(unsigned pin, int value)
 122 {
 123         if (kw_gpio_is_valid(pin, GPIO_OUTPUT_OK) != 0)
 124         {
 125                 printf("%s: invalid GPIO %d\n", __func__, pin);
 126                 return 1;
 127         }
 128
 129         __set_blinking(pin, 0);
 130
 131         /* Configure GPIO output value. */
 132         __set_level(pin, value);
 133
 134         /* Configure GPIO direction. */
 135         __set_direction(pin, 0);
 136
 137         return 0;
 138 }
 139
 140 int kw_gpio_get_value(unsigned pin)
 141 {
 142         int val;
 143
 144         if (readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31)))
 145                 val = readl(GPIO_DATA_IN(pin)) ^ readl(GPIO_IN_POL(pin));
 146         else
 147                 val = readl(GPIO_OUT(pin));
 148
 149         return (val >> (pin & 31)) & 1;
 150 }
 151
 152 void kw_gpio_set_value(unsigned pin, int value)
 153 {
 154         /* Configure GPIO output value. */
 155         __set_level(pin, value);
 156 }
 157
 158 void kw_gpio_set_blink(unsigned pin, int blink)
 159 {
 160         /* Set output value to zero. */
 161         __set_level(pin, 0);
 162
 163         /* Set blinking. */
 164         __set_blinking(pin, blink);
 165 }