diff options
Diffstat (limited to 'arch/arm/plat-mxc/iomux-v1.c')
| -rw-r--r-- | arch/arm/plat-mxc/iomux-v1.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/iomux-v1.c b/arch/arm/plat-mxc/iomux-v1.c new file mode 100644 index 00000000000..0b745686b37 --- /dev/null +++ b/arch/arm/plat-mxc/iomux-v1.c @@ -0,0 +1,156 @@ +/* + * arch/arm/plat-mxc/iomux-v1.c + * + * author: Sascha Hauer + * Created: april 20th, 2004 + * Copyright: Synertronixx GmbH + * + * Common code for i.MX1, i.MX21 and i.MX27 + * + * 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); |