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[ARM] 4275/1: generic gpio layer for ixp4xx 

This patch brings generic gpio layer support to ixp4xx. It creates
functions needed for gpio->irq and irq->gpio translation.

It expects and initial value to be passed to
gpio_direction_output() which has been introduced by
commit 28735a7253 in Linus git tree.

Generic gpio layer is going to be used by pxa2xx_udc driver.

Signed-off-by: Milan Svoboda <msvoboda@ra.rockwell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Milan Svoboda 2007-03-21 14:04:08 +01:00 committed by Russell King
parent 235b185ce4
commit 25735d10ba
2 changed files with 96 additions and 0 deletions
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23
arch/arm/mach-ixp4xx/common.c
View File

@ -102,6 +102,29 @@ static signed char irq2gpio[32] = {
7, 8, 9, 10, 11, 12, -1, -1,
};
int gpio_to_irq(int gpio)
{
int irq;
for (irq = 0; irq < 32; irq++) {
if (irq2gpio[irq] == gpio)
return irq;
}
return -EINVAL;
}
EXPORT_SYMBOL(gpio_to_irq);
int irq_to_gpio(int irq)
{
int gpio = (irq < 32) ? irq2gpio[irq] : -EINVAL;
if (gpio == -1)
return -EINVAL;
return gpio;
}
EXPORT_SYMBOL(irq_to_gpio);
static int ixp4xx_set_irq_type(unsigned int irq, unsigned int type)
{
int line = irq2gpio[irq];

73
include/asm-arm/arch-ixp4xx/gpio.h Normal file
View File

@ -0,0 +1,73 @@
/*
* linux/include/asm-arm/arch-ixp4xx/gpio.h
*
* IXP4XX GPIO wrappers for arch-neutral GPIO calls
*
* Written by Milan Svoboda <msvoboda@ra.rockwell.com>
* Based on PXA implementation by Philipp Zabel <philipp.zabel@gmail.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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __ASM_ARCH_IXP4XX_GPIO_H
#define __ASM_ARCH_IXP4XX_GPIO_H
#include <asm/hardware.h>
static inline int gpio_request(unsigned gpio, const char *label)
{
return 0;
}
static inline void gpio_free(unsigned gpio)
{
return;
}
static inline int gpio_direction_input(unsigned gpio)
{
gpio_line_config(gpio, IXP4XX_GPIO_IN);
return 0;
}
static inline int gpio_direction_output(unsigned gpio, int level)
{
gpio_line_set(gpio, level);
gpio_line_config(gpio, IXP4XX_GPIO_OUT);
return 0;
}
static inline int gpio_get_value(unsigned gpio)
{
int value;
gpio_line_get(gpio, &value);
return value;
}
static inline void gpio_set_value(unsigned gpio, int value)
{
gpio_line_set(gpio, value);
}
#include <asm-generic/gpio.h> /* cansleep wrappers */
extern int gpio_to_irq(int gpio);
extern int irq_to_gpio(int gpio);
#endif