kernel-fxtec-pro1x/arch/m68k/include/asm/mcfgpio.h
Greg Ungerer f23c144d42 m68knommu: make duplicated ColdFire GPIO init code common for all
The code that adds each ColdFire platforms GPIO signals is duplicated in
each platforms specific code. Remove it from each platforms code and put
a single version in the existing ColdFire gpio subsystem init code.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Steven King <sfking@fdwdc.com>
2012-05-20 21:21:47 +10:00

97 lines
3.3 KiB
C

/*
* 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;
};
extern struct mcf_gpio_chip mcf_gpio_chips[];
extern unsigned int mcf_gpio_chips_size;
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