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/*
* Common utility code for GTA02
*
* Copyright (C) 2008 by Openmoko, Inc.
* Author: Holger Hans Peter Freyther <freyther@openmoko.org>
* All rights reserved.
*
* 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
*
*/
#include <linux/module.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <asm/gpio.h>
#include <mach/regs-gpio.h>
#include <linux/gta02-shadow.h>
/**
* Shadow GPIO bank B handling. For the LEDs we need to keep track of the state
* in software. The s3c2410_gpio_setpin must not be used for GPIOs on bank B
*/
static unsigned long gpb_mask;
static unsigned long gpb_state;
void gta02_gpb_add_shadow_gpio(unsigned int gpio)
{
unsigned long offset = S3C2410_GPIO_OFFSET(gpio);
unsigned long flags;
local_irq_save(flags);
gpb_mask |= 1L << offset;
local_irq_restore(flags);
}
EXPORT_SYMBOL(gta02_gpb_add_shadow_gpio);
static void set_shadow_gpio(unsigned long offset, unsigned int value)
{
unsigned long state = value != 0;
gpb_state &= ~(1L << offset);
gpb_state |= state << offset;
}
void gta02_gpb_setpin(unsigned int pin, unsigned to)
{
void __iomem *base = S3C24XX_GPIO_BASE(S3C2410_GPB0);
unsigned long offset = S3C2410_GPIO_OFFSET(pin);
unsigned long flags;
unsigned long dat;
BUG_ON(base != S3C24XX_GPIO_BASE(pin));
local_irq_save(flags);
dat = __raw_readl(base + 0x04);
/* Add the shadow values */
dat &= ~gpb_mask;
dat |= gpb_state;
/* Do the operation like s3c2410_gpio_setpin */
dat &= ~(1L << offset);
dat |= to << offset;
/* Update the shadow state */
if ((1L << offset) & gpb_mask)
set_shadow_gpio(offset, to);
__raw_writel(dat, base + 0x04);
local_irq_restore(flags);
}
EXPORT_SYMBOL(gta02_gpb_setpin);
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