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/*
* 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 mcfgpio_h
#define mcfgpio_h
#include <linux/io.h>
#include <asm-generic/gpio.h>
struct mcf_gpio_chip {
struct gpio_chip gpio_chip;
void __iomem *pddr;
void __iomem *podr;
void __iomem *ppdr;
void __iomem *setr;
void __iomem *clrr;
const u8 *gpio_to_pinmux;
};
int mcf_gpio_direction_input(struct gpio_chip *, unsigned);
int mcf_gpio_get_value(struct gpio_chip *, unsigned);
int mcf_gpio_direction_output(struct gpio_chip *, unsigned, int);
void mcf_gpio_set_value(struct gpio_chip *, unsigned, int);
void mcf_gpio_set_value_fast(struct gpio_chip *, unsigned, int);
int mcf_gpio_request(struct gpio_chip *, unsigned);
void mcf_gpio_free(struct gpio_chip *, unsigned);
/*
* Define macros to ease the pain of setting up the GPIO tables. There
* are two cases we need to deal with here, they cover all currently
* available ColdFire GPIO hardware. There are of course minor differences
* in the layout and number of bits in each ColdFire part, but the macros
* take all that in.
*
* Firstly is the conventional GPIO registers where we toggle individual
* bits in a register, preserving the other bits in the register. For
* lack of a better term I have called this the slow method.
*/
#define MCFGPS(mlabel, mbase, mngpio, mpddr, mpodr, mppdr) \
{ \
.gpio_chip = { \
.label = #mlabel, \
.request = mcf_gpio_request, \
.free = mcf_gpio_free, \
.direction_input = mcf_gpio_direction_input, \
.direction_output = mcf_gpio_direction_output,\
.get = mcf_gpio_get_value, \
.set = mcf_gpio_set_value, \
.base = mbase, \
.ngpio = mngpio, \
}, \
.pddr = (void __iomem *) mpddr, \
.podr = (void __iomem *) mpodr, \
.ppdr = (void __iomem *) mppdr, \
}
/*
* Secondly is the faster case, where we have set and clear registers
* that allow us to set or clear a bit with a single write, not having
* to worry about preserving other bits.
*/
#define MCFGPF(mlabel, mbase, mngpio) \
{ \
.gpio_chip = { \
.label = #mlabel, \
.request = mcf_gpio_request, \
.free = mcf_gpio_free, \
.direction_input = mcf_gpio_direction_input, \
.direction_output = mcf_gpio_direction_output,\
.get = mcf_gpio_get_value, \
.set = mcf_gpio_set_value_fast, \
.base = mbase, \
.ngpio = mngpio, \
}, \
.pddr = (void __iomem *) MCFGPIO_PDDR_##mlabel, \
.podr = (void __iomem *) MCFGPIO_PODR_##mlabel, \
.ppdr = (void __iomem *) MCFGPIO_PPDSDR_##mlabel, \
.setr = (void __iomem *) MCFGPIO_PPDSDR_##mlabel, \
.clrr = (void __iomem *) MCFGPIO_PCLRR_##mlabel, \
}
#endif
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