openwrt-xburst/target/linux/rb532/files/arch/mips/rb500/gpio.c

/*
 *  Miscellaneous functions for IDT EB434 board
 *
 *  Copyright 2004 IDT Inc. (rischelp@idt.com)
 *  Copyright 2006 Phil Sutter <n0-1@freewrt.org>
 *  Copyright 2007 Florian Fainelli <florian@openwrt.org>
 *
 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/platform_device.h>

#include <asm/addrspace.h>
#include <asm/gpio.h>

#include <asm/rc32434/rb.h>

#define GPIO_BADDR  0xb8050000

static volatile unsigned char *devCtl3Base;
static unsigned char latchU5State;
static spinlock_t clu5Lock = SPIN_LOCK_UNLOCKED;

struct rb500_gpio_reg __iomem *rb500_gpio_reg0;
EXPORT_SYMBOL(rb500_gpio_reg0);

static struct resource rb500_gpio_reg0_res[] = {
	{
		.name 	= "gpio_reg0",
		.start 	= GPIO_BADDR,
		.end 	= GPIO_BADDR + sizeof(struct rb500_gpio_reg),
		.flags 	= IORESOURCE_MEM,
	}
};

void set434Reg(unsigned regOffs, unsigned bit, unsigned len, unsigned val)
{
	unsigned flags, data;
	unsigned i = 0;

	spin_lock_irqsave(&clu5Lock, flags);
	data = *(volatile unsigned *) (IDT434_REG_BASE + regOffs);
	for (i = 0; i != len; ++i) {
		if (val & (1 << i))
			data |= (1 << (i + bit));
		else
			data &= ~(1 << (i + bit));
	}
	*(volatile unsigned *) (IDT434_REG_BASE + regOffs) = data;
	spin_unlock_irqrestore(&clu5Lock, flags);
}

EXPORT_SYMBOL(set434Reg);

void changeLatchU5(unsigned char orMask, unsigned char nandMask)
{
	unsigned flags;

	spin_lock_irqsave(&clu5Lock, flags);
	latchU5State = (latchU5State | orMask) & ~nandMask;
	if (!devCtl3Base)
		devCtl3Base = (volatile unsigned char *)
		    KSEG1ADDR(*(volatile unsigned *)
			      KSEG1ADDR(0x18010030));
	*devCtl3Base = latchU5State;
	spin_unlock_irqrestore(&clu5Lock, flags);
}

EXPORT_SYMBOL(changeLatchU5);

unsigned char getLatchU5State(void)
{
	return latchU5State;
}

EXPORT_SYMBOL(getLatchU5State);

int rb500_gpio_get_value(unsigned gpio)
{
	u32 reg;

	reg = readl(&rb500_gpio_reg0->gpiod);
	return (reg & (1 << gpio));
}

EXPORT_SYMBOL(rb500_gpio_get_value);

void rb500_gpio_set_value(unsigned gpio, int value)
{
	u32 reg;

	reg = (u32)&rb500_gpio_reg0->gpiod;

	writel(value, (void *)(reg & (1 << gpio)));
}

EXPORT_SYMBOL(rb500_gpio_set_value);

int rb500_gpio_direction_input(unsigned gpio)
{
	u32 reg;

	reg = (u32)&rb500_gpio_reg0->gpiocfg;
	writel(0, (void *)(reg & (1 << gpio)));

	return 0;
}

EXPORT_SYMBOL(rb500_gpio_direction_input);

int rb500_gpio_direction_output(unsigned gpio, int value)
{
	u32 reg;

	reg = (u32)&rb500_gpio_reg0->gpiocfg;
	if (value)
		writel(1, (void *)(reg & (1 << gpio)));

	return 0;
}

EXPORT_SYMBOL(rb500_gpio_direction_output);

int __init rb500_gpio_init(void)
{
	rb500_gpio_reg0 = ioremap_nocache(rb500_gpio_reg0_res[0].start,
				rb500_gpio_reg0_res[0].end - rb500_gpio_reg0_res[0].start);

	if (!rb500_gpio_reg0) {
		printk(KERN_ERR "rb500: cannot remap GPIO register 0\n");
		return -ENXIO;
	}

	return 0;
}