mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-28 18:15:54 +02:00
fb189822fc
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15918 3c298f89-4303-0410-b956-a3cf2f4a3e73
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
|
|
* 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);
|