diff options
Diffstat (limited to 'arch/arm/plat-mxc/iomux-v1.c')
| -rw-r--r-- | arch/arm/plat-mxc/iomux-v1.c | 238 |
1 files changed, 238 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..960a02cbcba --- /dev/null +++ b/arch/arm/plat-mxc/iomux-v1.c @@ -0,0 +1,238 @@ +/* + * arch/arm/plat-mxc/iomux-v1.c + * + * Copyright (C) 2004 Sascha Hauer, Synertronixx GmbH + * Copyright (C) 2009 Uwe Kleine-Koenig, Pengutronix + * + * 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., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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-v1.h> + +static void __iomem *imx_iomuxv1_baseaddr; +static unsigned imx_iomuxv1_numports; + +static inline unsigned long imx_iomuxv1_readl(unsigned offset) +{ + return __raw_readl(imx_iomuxv1_baseaddr + offset); +} + +static inline void imx_iomuxv1_writel(unsigned long val, unsigned offset) +{ + __raw_writel(val, imx_iomuxv1_baseaddr + offset); +} + +static inline void imx_iomuxv1_rmwl(unsigned offset, + unsigned long mask, unsigned long value) +{ + unsigned long reg = imx_iomuxv1_readl(offset); + + reg &= ~mask; + reg |= value; + + imx_iomuxv1_writel(reg, offset); +} + +static inline void imx_iomuxv1_set_puen( + unsigned int port, unsigned int pin, int on) +{ + unsigned long mask = 1 << pin; + + imx_iomuxv1_rmwl(MXC_PUEN(port), mask, on ? mask : 0); +} + +static inline void imx_iomuxv1_set_ddir( + unsigned int port, unsigned int pin, int out) +{ + unsigned long mask = 1 << pin; + + imx_iomuxv1_rmwl(MXC_DDIR(port), mask, out ? mask : 0); +} + +static inline void imx_iomuxv1_set_gpr( + unsigned int port, unsigned int pin, int af) +{ + unsigned long mask = 1 << pin; + + imx_iomuxv1_rmwl(MXC_GPR(port), mask, af ? mask : 0); +} + +static inline void imx_iomuxv1_set_gius( + unsigned int port, unsigned int pin, int inuse) +{ + unsigned long mask = 1 << pin; + + imx_iomuxv1_rmwl(MXC_GIUS(port), mask, inuse ? mask : 0); +} + +static inline void imx_iomuxv1_set_ocr( + unsigned int port, unsigned int pin, unsigned int ocr) +{ + unsigned long shift = (pin & 0xf) << 1; + unsigned long mask = 3 << shift; + unsigned long value = ocr << shift; + unsigned long offset = pin < 16 ? MXC_OCR1(port) : MXC_OCR2(port); + + imx_iomuxv1_rmwl(offset, mask, value); +} + +static inline void imx_iomuxv1_set_iconfa( + unsigned int port, unsigned int pin, unsigned int aout) +{ + unsigned long shift = (pin & 0xf) << 1; + unsigned long mask = 3 << shift; + unsigned long value = aout << shift; + unsigned long offset = pin < 16 ? MXC_ICONFA1(port) : MXC_ICONFA2(port); + + imx_iomuxv1_rmwl(offset, mask, value); +} + +static inline void imx_iomuxv1_set_iconfb( + unsigned int port, unsigned int pin, unsigned int bout) +{ + unsigned long shift = (pin & 0xf) << 1; + unsigned long mask = 3 << shift; + unsigned long value = bout << shift; + unsigned long offset = pin < 16 ? MXC_ICONFB1(port) : MXC_ICONFB2(port); + + imx_iomuxv1_rmwl(offset, mask, value); +} + +int 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 aout = (gpio_mode >> GPIO_AOUT_SHIFT) & 3; + unsigned int bout = (gpio_mode >> GPIO_BOUT_SHIFT) & 3; + + if (port >= imx_iomuxv1_numports) + return -EINVAL; + + /* Pullup enable */ + imx_iomuxv1_set_puen(port, pin, gpio_mode & GPIO_PUEN); + + /* Data direction */ + imx_iomuxv1_set_ddir(port, pin, gpio_mode & GPIO_OUT); + + /* Primary / alternate function */ + imx_iomuxv1_set_gpr(port, pin, gpio_mode & GPIO_AF); + + /* use as gpio? */ + imx_iomuxv1_set_gius(port, pin, !(gpio_mode & (GPIO_PF | GPIO_AF))); + + imx_iomuxv1_set_ocr(port, pin, ocr); + + imx_iomuxv1_set_iconfa(port, pin, aout); + + imx_iomuxv1_set_iconfb(port, pin, bout); + + return 0; +} +EXPORT_SYMBOL(mxc_gpio_mode); + +static int imx_iomuxv1_setup_multiple(const int *list, unsigned count) +{ + size_t i; + int ret; + + for (i = 0; i < count; ++i) { + ret = mxc_gpio_mode(list[i]); + + if (ret) + return ret; + } + + return ret; +} + +int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count, + const char *label) +{ + size_t i; + int ret; + + for (i = 0; i < count; ++i) { + unsigned gpio = pin_list[i] & (GPIO_PIN_MASK | GPIO_PORT_MASK); + + ret = gpio_request(gpio, label); + if (ret) + goto err_gpio_request; + } + + ret = imx_iomuxv1_setup_multiple(pin_list, count); + if (ret) + goto err_setup; + + return 0; + +err_setup: + BUG_ON(i != count); + +err_gpio_request: + 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) +{ + size_t i; + + for (i = 0; i < count; ++i) { + unsigned gpio = pin_list[i] & (GPIO_PIN_MASK | GPIO_PORT_MASK); + + gpio_free(gpio); + } +} +EXPORT_SYMBOL(mxc_gpio_release_multiple_pins); + +static int imx_iomuxv1_init(void) +{ +#ifdef CONFIG_ARCH_MX1 + if (cpu_is_mx1()) { + imx_iomuxv1_baseaddr = MX1_IO_ADDRESS(MX1_GPIO_BASE_ADDR); + imx_iomuxv1_numports = MX1_NUM_GPIO_PORT; + } else +#endif +#ifdef CONFIG_MACH_MX21 + if (cpu_is_mx21()) { + imx_iomuxv1_baseaddr = MX21_IO_ADDRESS(MX21_GPIO_BASE_ADDR); + imx_iomuxv1_numports = MX21_NUM_GPIO_PORT; + } else +#endif +#ifdef CONFIG_MACH_MX27 + if (cpu_is_mx27()) { + imx_iomuxv1_baseaddr = MX27_IO_ADDRESS(MX27_GPIO_BASE_ADDR); + imx_iomuxv1_numports = MX27_NUM_GPIO_PORT; + } else +#endif + return -ENODEV; + + return 0; +} +pure_initcall(imx_iomuxv1_init); |