arch/arm/plat-mxc/iomux-mx1-mx2.c

   1 /*
   2  *  arch/arm/mach-mxc/generic.c
   3  *
   4  *  author: Sascha Hauer
   5  *  Created: april 20th, 2004
   6  *  Copyright: Synertronixx GmbH
   7  *
   8  *  Common code for i.MX machines
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  */
  25
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/string.h>
  31 #include <linux/gpio.h>
  32
  33 #include <mach/hardware.h>
  34 #include <asm/mach/map.h>
  35 #include <mach/iomux.h>
  36
  37 void mxc_gpio_mode(int gpio_mode)
  38 {
  39         unsigned int pin = gpio_mode & GPIO_PIN_MASK;
  40         unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
  41         unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
  42         unsigned int tmp;
  43
  44         /* Pullup enable */
  45         tmp = __raw_readl(VA_GPIO_BASE + MXC_PUEN(port));
  46         if (gpio_mode & GPIO_PUEN)
  47                 tmp |= (1 << pin);
  48         else
  49                 tmp &= ~(1 << pin);
  50         __raw_writel(tmp, VA_GPIO_BASE + MXC_PUEN(port));
  51
  52         /* Data direction */
  53         tmp = __raw_readl(VA_GPIO_BASE + MXC_DDIR(port));
  54         if (gpio_mode & GPIO_OUT)
  55                 tmp |= 1 << pin;
  56         else
  57                 tmp &= ~(1 << pin);
  58         __raw_writel(tmp, VA_GPIO_BASE + MXC_DDIR(port));
  59
  60         /* Primary / alternate function */
  61         tmp = __raw_readl(VA_GPIO_BASE + MXC_GPR(port));
  62         if (gpio_mode & GPIO_AF)
  63                 tmp |= (1 << pin);
  64         else
  65                 tmp &= ~(1 << pin);
  66         __raw_writel(tmp, VA_GPIO_BASE + MXC_GPR(port));
  67
  68         /* use as gpio? */
  69         tmp = __raw_readl(VA_GPIO_BASE + MXC_GIUS(port));
  70         if (gpio_mode & (GPIO_PF | GPIO_AF))
  71                 tmp &= ~(1 << pin);
  72         else
  73                 tmp |= (1 << pin);
  74         __raw_writel(tmp, VA_GPIO_BASE + MXC_GIUS(port));
  75
  76         if (pin < 16) {
  77                 tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR1(port));
  78                 tmp &= ~(3 << (pin * 2));
  79                 tmp |= (ocr << (pin * 2));
  80                 __raw_writel(tmp, VA_GPIO_BASE + MXC_OCR1(port));
  81
  82                 tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA1(port));
  83                 tmp &= ~(3 << (pin * 2));
  84                 tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
  85                 __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA1(port));
  86
  87                 tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB1(port));
  88                 tmp &= ~(3 << (pin * 2));
  89                 tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
  90                 __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB1(port));
  91         } else {
  92                 pin -= 16;
  93
  94                 tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR2(port));
  95                 tmp &= ~(3 << (pin * 2));
  96                 tmp |= (ocr << (pin * 2));
  97                 __raw_writel(tmp, VA_GPIO_BASE + MXC_OCR2(port));
  98
  99                 tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA2(port));
 100                 tmp &= ~(3 << (pin * 2));
 101                 tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
 102                 __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA2(port));
 103
 104                 tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB2(port));
 105                 tmp &= ~(3 << (pin * 2));
 106                 tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
 107                 __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB2(port));
 108         }
 109 }
 110 EXPORT_SYMBOL(mxc_gpio_mode);
 111
 112 int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 113                 const char *label)
 114 {
 115         const int *p = pin_list;
 116         int i;
 117         unsigned gpio;
 118         unsigned mode;
 119         int ret = -EINVAL;
 120
 121         for (i = 0; i < count; i++) {
 122                 gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
 123                 mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
 124
 125                 if (gpio >= (GPIO_PORT_MAX + 1) * 32)
 126                         goto setup_error;
 127
 128                 ret = gpio_request(gpio, label);
 129                 if (ret)
 130                         goto setup_error;
 131
 132                 mxc_gpio_mode(gpio | mode);
 133
 134                 p++;
 135         }
 136         return 0;
 137
 138 setup_error:
 139         mxc_gpio_release_multiple_pins(pin_list, i);
 140         return ret;
 141 }
 142 EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);
 143
 144 void mxc_gpio_release_multiple_pins(const int *pin_list, int count)
 145 {
 146         const int *p = pin_list;
 147         int i;
 148
 149         for (i = 0; i < count; i++) {
 150                 unsigned gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
 151                 gpio_free(gpio);
 152                 p++;
 153         }
 154
 155 }
 156 EXPORT_SYMBOL(mxc_gpio_release_multiple_pins);
 157