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iomux-mx1-mx2.c

/*
 *  arch/arm/mach-mxc/generic.c
 *
 *  author: Sascha Hauer
 *  Created: april 20th, 2004
 *  Copyright: Synertronixx GmbH
 *
 *  Common code for i.MX machines
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/gpio.h>

#include <mach/hardware.h>
#include <asm/mach/map.h>
#include <mach/iomux-mx1-mx2.h>

void mxc_gpio_mode(int gpio_mode)
{
      unsigned int pin = gpio_mode & GPIO_PIN_MASK;
      unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
      unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
      unsigned int tmp;

      /* Pullup enable */
      tmp = __raw_readl(VA_GPIO_BASE + MXC_PUEN(port));
      if (gpio_mode & GPIO_PUEN)
            tmp |= (1 << pin);
      else
            tmp &= ~(1 << pin);
      __raw_writel(tmp, VA_GPIO_BASE + MXC_PUEN(port));

      /* Data direction */
      tmp = __raw_readl(VA_GPIO_BASE + MXC_DDIR(port));
      if (gpio_mode & GPIO_OUT)
            tmp |= 1 << pin;
      else
            tmp &= ~(1 << pin);
      __raw_writel(tmp, VA_GPIO_BASE + MXC_DDIR(port));

      /* Primary / alternate function */
      tmp = __raw_readl(VA_GPIO_BASE + MXC_GPR(port));
      if (gpio_mode & GPIO_AF)
            tmp |= (1 << pin);
      else
            tmp &= ~(1 << pin);
      __raw_writel(tmp, VA_GPIO_BASE + MXC_GPR(port));

      /* use as gpio? */
      tmp = __raw_readl(VA_GPIO_BASE + MXC_GIUS(port));
      if (gpio_mode & (GPIO_PF | GPIO_AF))
            tmp &= ~(1 << pin);
      else
            tmp |= (1 << pin);
      __raw_writel(tmp, VA_GPIO_BASE + MXC_GIUS(port));

      if (pin < 16) {
            tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR1(port));
            tmp &= ~(3 << (pin * 2));
            tmp |= (ocr << (pin * 2));
            __raw_writel(tmp, VA_GPIO_BASE + MXC_OCR1(port));

            tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA1(port));
            tmp &= ~(3 << (pin * 2));
            tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
            __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA1(port));

            tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB1(port));
            tmp &= ~(3 << (pin * 2));
            tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
            __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB1(port));
      } else {
            pin -= 16;

            tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR2(port));
            tmp &= ~(3 << (pin * 2));
            tmp |= (ocr << (pin * 2));
            __raw_writel(tmp, VA_GPIO_BASE + MXC_OCR2(port));

            tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA2(port));
            tmp &= ~(3 << (pin * 2));
            tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
            __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA2(port));

            tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB2(port));
            tmp &= ~(3 << (pin * 2));
            tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
            __raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB2(port));
      }
}
EXPORT_SYMBOL(mxc_gpio_mode);

int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
                        int alloc_mode, const char *label)
{
      const int *p = pin_list;
      int i;
      unsigned gpio;
      unsigned mode;

      for (i = 0; i < count; i++) {
            gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
            mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);

            if (gpio >= (GPIO_PORT_MAX + 1) * 32)
                  goto setup_error;

            if (alloc_mode & MXC_GPIO_ALLOC_MODE_RELEASE)
                  gpio_free(gpio);
            else if (!(alloc_mode & MXC_GPIO_ALLOC_MODE_NO_ALLOC))
                  if (gpio_request(gpio, label)
                     && !(alloc_mode & MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
                        goto setup_error;

            if (!(alloc_mode & (MXC_GPIO_ALLOC_MODE_ALLOC_ONLY |
                            MXC_GPIO_ALLOC_MODE_RELEASE)))
                  mxc_gpio_mode(gpio | mode);

            p++;
      }
      return 0;

setup_error:
      if (alloc_mode & (MXC_GPIO_ALLOC_MODE_NO_ALLOC |
          MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
            return -EINVAL;

      while (p != pin_list) {
            p--;
            gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
            gpio_free(gpio);
      }

      return -EINVAL;
}
EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);


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