158 lines
4.2 KiB
C
158 lines
4.2 KiB
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.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);
|
|
|