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