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Commit 25735d10 authored by Milan Svoboda's avatar Milan Svoboda Committed by Russell King
Browse files

[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 28735a72 in Linus git tree.

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

Signed-off-by: default avatarMilan Svoboda <msvoboda@ra.rockwell.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 235b185c

arch/arm/mach-ixp4xx/common.c

+23 −0
Original line number Diff line number Diff line
@@ -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];

include/asm-arm/arch-ixp4xx/gpio.h

0 → 100644
+73 −0
Original line number Diff line number Diff line 
/*

 * 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