/*
* 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.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,
const char *label)
{
const int *p = pin_list;
int i;
unsigned gpio;
unsigned mode;
int ret = -EINVAL;
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;
ret = gpio_request(gpio, label);
if (ret)
goto setup_error;
mxc_gpio_mode(gpio | mode);
p++;
}
return 0;
setup_error:
mxc_gpio_release_multiple_pins(pin_list, i);
return ret;
}
EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);
void mxc_gpio_release_multiple_pins(const int *pin_list, int count)
{
const int *p = pin_list;
int i;
for (i = 0; i < count; i++) {
unsigned gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
gpio_free(gpio);
p++;
}
}
EXPORT_SYMBOL(mxc_gpio_release_multiple_pins);
