157 lines
4.3 KiB
C
157 lines
4.3 KiB
C
/*
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* arch/arm/mach-mxc/generic.c
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*
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* author: Sascha Hauer
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* Created: april 20th, 2004
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* Copyright: Synertronixx GmbH
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*
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* Common code for i.MX machines
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/gpio.h>
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#include <mach/hardware.h>
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#include <asm/mach/map.h>
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#include <mach/iomux-mx1-mx2.h>
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void mxc_gpio_mode(int gpio_mode)
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{
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unsigned int pin = gpio_mode & GPIO_PIN_MASK;
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unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
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unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
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unsigned int tmp;
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/* Pullup enable */
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tmp = __raw_readl(VA_GPIO_BASE + MXC_PUEN(port));
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if (gpio_mode & GPIO_PUEN)
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tmp |= (1 << pin);
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else
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tmp &= ~(1 << pin);
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__raw_writel(tmp, VA_GPIO_BASE + MXC_PUEN(port));
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/* Data direction */
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tmp = __raw_readl(VA_GPIO_BASE + MXC_DDIR(port));
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if (gpio_mode & GPIO_OUT)
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tmp |= 1 << pin;
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else
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tmp &= ~(1 << pin);
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__raw_writel(tmp, VA_GPIO_BASE + MXC_DDIR(port));
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/* Primary / alternate function */
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tmp = __raw_readl(VA_GPIO_BASE + MXC_GPR(port));
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if (gpio_mode & GPIO_AF)
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tmp |= (1 << pin);
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else
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tmp &= ~(1 << pin);
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__raw_writel(tmp, VA_GPIO_BASE + MXC_GPR(port));
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/* use as gpio? */
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tmp = __raw_readl(VA_GPIO_BASE + MXC_GIUS(port));
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if (gpio_mode & (GPIO_PF | GPIO_AF))
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tmp &= ~(1 << pin);
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else
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tmp |= (1 << pin);
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__raw_writel(tmp, VA_GPIO_BASE + MXC_GIUS(port));
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if (pin < 16) {
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tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR1(port));
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tmp &= ~(3 << (pin * 2));
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tmp |= (ocr << (pin * 2));
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__raw_writel(tmp, VA_GPIO_BASE + MXC_OCR1(port));
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tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA1(port));
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tmp &= ~(3 << (pin * 2));
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tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
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__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA1(port));
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tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB1(port));
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tmp &= ~(3 << (pin * 2));
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tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
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__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB1(port));
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} else {
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pin -= 16;
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tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR2(port));
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tmp &= ~(3 << (pin * 2));
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tmp |= (ocr << (pin * 2));
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__raw_writel(tmp, VA_GPIO_BASE + MXC_OCR2(port));
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tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA2(port));
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tmp &= ~(3 << (pin * 2));
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tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
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__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA2(port));
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tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB2(port));
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tmp &= ~(3 << (pin * 2));
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tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
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__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB2(port));
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}
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}
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EXPORT_SYMBOL(mxc_gpio_mode);
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int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
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int alloc_mode, const char *label)
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{
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const int *p = pin_list;
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int i;
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unsigned gpio;
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unsigned mode;
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for (i = 0; i < count; i++) {
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gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
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mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
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if (gpio >= (GPIO_PORT_MAX + 1) * 32)
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goto setup_error;
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if (alloc_mode & MXC_GPIO_ALLOC_MODE_RELEASE)
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gpio_free(gpio);
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else if (!(alloc_mode & MXC_GPIO_ALLOC_MODE_NO_ALLOC))
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if (gpio_request(gpio, label)
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&& !(alloc_mode & MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
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goto setup_error;
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if (!(alloc_mode & (MXC_GPIO_ALLOC_MODE_ALLOC_ONLY |
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MXC_GPIO_ALLOC_MODE_RELEASE)))
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mxc_gpio_mode(gpio | mode);
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p++;
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}
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return 0;
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setup_error:
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if (alloc_mode & (MXC_GPIO_ALLOC_MODE_NO_ALLOC |
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MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
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return -EINVAL;
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while (p != pin_list) {
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p--;
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gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
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gpio_free(gpio);
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);
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