| /* |
| * Coldfire generic GPIO support |
| * |
| * (C) Copyright 2009, Steven King <sfking@fdwdc.com> |
| * |
| * 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; version 2 of the License. |
| * |
| * 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. |
| */ |
| |
| #ifndef coldfire_gpio_h |
| #define coldfire_gpio_h |
| |
| #include <linux/io.h> |
| #include <asm/coldfire.h> |
| #include <asm/mcfsim.h> |
| #include <asm/mcfgpio.h> |
| /* |
| * The Generic GPIO functions |
| * |
| * If the gpio is a compile time constant and is one of the Coldfire gpios, |
| * use the inline version, otherwise dispatch thru gpiolib. |
| */ |
| |
| static inline int gpio_get_value(unsigned gpio) |
| { |
| if (__builtin_constant_p(gpio) && gpio < MCFGPIO_PIN_MAX) |
| return mcfgpio_read(__mcfgpio_ppdr(gpio)) & mcfgpio_bit(gpio); |
| else |
| return __gpio_get_value(gpio); |
| } |
| |
| static inline void gpio_set_value(unsigned gpio, int value) |
| { |
| if (__builtin_constant_p(gpio) && gpio < MCFGPIO_PIN_MAX) { |
| if (gpio < MCFGPIO_SCR_START) { |
| unsigned long flags; |
| MCFGPIO_PORTTYPE data; |
| |
| local_irq_save(flags); |
| data = mcfgpio_read(__mcfgpio_podr(gpio)); |
| if (value) |
| data |= mcfgpio_bit(gpio); |
| else |
| data &= ~mcfgpio_bit(gpio); |
| mcfgpio_write(data, __mcfgpio_podr(gpio)); |
| local_irq_restore(flags); |
| } else { |
| if (value) |
| mcfgpio_write(mcfgpio_bit(gpio), |
| MCFGPIO_SETR_PORT(gpio)); |
| else |
| mcfgpio_write(~mcfgpio_bit(gpio), |
| MCFGPIO_CLRR_PORT(gpio)); |
| } |
| } else |
| __gpio_set_value(gpio, value); |
| } |
| |
| static inline int gpio_to_irq(unsigned gpio) |
| { |
| #if defined(MCFGPIO_IRQ_MIN) |
| if ((gpio >= MCFGPIO_IRQ_MIN) && (gpio < MCFGPIO_IRQ_MAX)) |
| #else |
| if (gpio < MCFGPIO_IRQ_MAX) |
| #endif |
| return gpio + MCFGPIO_IRQ_VECBASE; |
| else |
| return __gpio_to_irq(gpio); |
| } |
| |
| static inline int irq_to_gpio(unsigned irq) |
| { |
| return (irq >= MCFGPIO_IRQ_VECBASE && |
| irq < (MCFGPIO_IRQ_VECBASE + MCFGPIO_IRQ_MAX)) ? |
| irq - MCFGPIO_IRQ_VECBASE : -ENXIO; |
| } |
| |
| static inline int gpio_cansleep(unsigned gpio) |
| { |
| return gpio < MCFGPIO_PIN_MAX ? 0 : __gpio_cansleep(gpio); |
| } |
| |
| static inline int gpio_request_one(unsigned gpio, unsigned long flags, const char *label) |
| { |
| int err; |
| |
| err = gpio_request(gpio, label); |
| if (err) |
| return err; |
| |
| if (flags & GPIOF_DIR_IN) |
| err = gpio_direction_input(gpio); |
| else |
| err = gpio_direction_output(gpio, |
| (flags & GPIOF_INIT_HIGH) ? 1 : 0); |
| |
| if (err) |
| gpio_free(gpio); |
| |
| return err; |
| } |
| |
| #endif |