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linux/arch/mips/rb532/gpio.c
Florian Fainelli d888e25b8d MIPS: RB532: Convert to GPIO lib 
This patch converts the rb532 code to use gpio library
and register its gpio chip.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-10-11 16:18:47 +01:00

316 lines
7.6 KiB
C
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/*
* 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/spinlock.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <asm/mach-rc32434/rb.h>
#include <asm/mach-rc32434/gpio.h>
struct rb532_gpio_chip {
struct gpio_chip chip;
void __iomem *regbase;
void (*set_int_level)(struct gpio_chip *chip, unsigned offset, int value);
int (*get_int_level)(struct gpio_chip *chip, unsigned offset);
void (*set_int_status)(struct gpio_chip *chip, unsigned offset, int value);
int (*get_int_status)(struct gpio_chip *chip, unsigned offset);
};
struct mpmc_device dev3;
static struct resource rb532_gpio_reg0_res[] = {
{
.name = "gpio_reg0",
.start = REGBASE + GPIOBASE,
.end = REGBASE + GPIOBASE + sizeof(struct rb532_gpio_reg) - 1,
.flags = IORESOURCE_MEM,
}
};
static struct resource rb532_dev3_ctl_res[] = {
{
.name = "dev3_ctl",
.start = REGBASE + DEV3BASE,
.end = REGBASE + DEV3BASE + sizeof(struct dev_reg) - 1,
.flags = IORESOURCE_MEM,
}
};
void set_434_reg(unsigned reg_offs, unsigned bit, unsigned len, unsigned val)
{
unsigned long flags;
unsigned data;
unsigned i = 0;
spin_lock_irqsave(&dev3.lock, flags);
data = readl(IDT434_REG_BASE + reg_offs);
for (i = 0; i != len; ++i) {
if (val & (1 << i))
data |= (1 << (i + bit));
else
data &= ~(1 << (i + bit));
}
writel(data, (IDT434_REG_BASE + reg_offs));
spin_unlock_irqrestore(&dev3.lock, flags);
}
EXPORT_SYMBOL(set_434_reg);
unsigned get_434_reg(unsigned reg_offs)
{
return readl(IDT434_REG_BASE + reg_offs);
}
EXPORT_SYMBOL(get_434_reg);
void set_latch_u5(unsigned char or_mask, unsigned char nand_mask)
{
unsigned long flags;
spin_lock_irqsave(&dev3.lock, flags);
dev3.state = (dev3.state | or_mask) & ~nand_mask;
writel(dev3.state, &dev3.base);
spin_unlock_irqrestore(&dev3.lock, flags);
}
EXPORT_SYMBOL(set_latch_u5);
unsigned char get_latch_u5(void)
{
return dev3.state;
}
EXPORT_SYMBOL(get_latch_u5);
/*
* Return GPIO level */
static int rb532_gpio_get(struct gpio_chip *chip, unsigned offset)
{
u32 mask = 1 << offset;
struct rb532_gpio_chip *gpch;
gpch = container_of(chip, struct rb532_gpio_chip, chip);
return readl(gpch->regbase + GPIOD) & mask;
}
/*
* Set output GPIO level
*/
static void rb532_gpio_set(struct gpio_chip *chip,
unsigned offset, int value)
{
unsigned long flags;
u32 mask = 1 << offset;
u32 tmp;
struct rb532_gpio_chip *gpch;
void __iomem *gpvr;
gpch = container_of(chip, struct rb532_gpio_chip, chip);
gpvr = gpch->regbase + GPIOD;
local_irq_save(flags);
tmp = readl(gpvr);
if (value)
tmp |= mask;
else
tmp &= ~mask;
writel(tmp, gpvr);
local_irq_restore(flags);
}
/*
* Set GPIO direction to input
*/
static int rb532_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
unsigned long flags;
u32 mask = 1 << offset;
u32 value;
struct rb532_gpio_chip *gpch;
void __iomem *gpdr;
gpch = container_of(chip, struct rb532_gpio_chip, chip);
gpdr = gpch->regbase + GPIOCFG;
local_irq_save(flags);
value = readl(gpdr);
value &= ~mask;
writel(value, gpdr);
local_irq_restore(flags);
return 0;
}
/*
* Set GPIO direction to output
*/
static int rb532_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
unsigned long flags;
u32 mask = 1 << offset;
u32 tmp;
struct rb532_gpio_chip *gpch;
void __iomem *gpdr;
gpch = container_of(chip, struct rb532_gpio_chip, chip);
writel(mask, gpch->regbase + GPIOD);
gpdr = gpch->regbase + GPIOCFG;
local_irq_save(flags);
tmp = readl(gpdr);
tmp |= mask;
writel(tmp, gpdr);
local_irq_restore(flags);
return 0;
}
/*
* Set the GPIO interrupt level
*/
static void rb532_gpio_set_int_level(struct gpio_chip *chip,
unsigned offset, int value)
{
unsigned long flags;
u32 mask = 1 << offset;
u32 tmp;
struct rb532_gpio_chip *gpch;
void __iomem *gpil;
gpch = container_of(chip, struct rb532_gpio_chip, chip);
gpil = gpch->regbase + GPIOILEVEL;
local_irq_save(flags);
tmp = readl(gpil);
if (value)
tmp |= mask;
else
tmp &= ~mask;
writel(tmp, gpil);
local_irq_restore(flags);
}
/*
* Get the GPIO interrupt level
*/
static int rb532_gpio_get_int_level(struct gpio_chip *chip, unsigned offset)
{
u32 mask = 1 << offset;
struct rb532_gpio_chip *gpch;
gpch = container_of(chip, struct rb532_gpio_chip, chip);
return readl(gpch->regbase + GPIOILEVEL) & mask;
}
/*
* Set the GPIO interrupt status
*/
static void rb532_gpio_set_int_status(struct gpio_chip *chip,
unsigned offset, int value)
{
unsigned long flags;
u32 mask = 1 << offset;
u32 tmp;
struct rb532_gpio_chip *gpch;
void __iomem *gpis;
gpch = container_of(chip, struct rb532_gpio_chip, chip);
gpis = gpch->regbase + GPIOISTAT;
local_irq_save(flags);
tmp = readl(gpis);
if (value)
tmp |= mask;
else
tmp &= ~mask;
writel(tmp, gpis);
local_irq_restore(flags);
}
/*
* Get the GPIO interrupt status
*/
static int rb532_gpio_get_int_status(struct gpio_chip *chip, unsigned offset)
{
u32 mask = 1 << offset;
struct rb532_gpio_chip *gpch;
gpch = container_of(chip, struct rb532_gpio_chip, chip);
return readl(gpch->regbase + GPIOISTAT) & mask;
}
static struct rb532_gpio_chip rb532_gpio_chip[] = {
[0] = {
.chip = {
.label = "gpio0",
.direction_input = rb532_gpio_direction_input,
.direction_output = rb532_gpio_direction_output,
.get = rb532_gpio_get,
.set = rb532_gpio_set,
.base = 0,
.ngpio = 32,
},
.get_int_level = rb532_gpio_get_int_level,
.set_int_level = rb532_gpio_set_int_level,
.get_int_status = rb532_gpio_get_int_status,
.set_int_status = rb532_gpio_set_int_status,
},
};
int __init rb532_gpio_init(void)
{
struct resource *r;
r = rb532_gpio_reg0_res;
rb532_gpio_chip->regbase = ioremap_nocache(r->start, r->end - r->start);
if (!rb532_gpio_chip->regbase) {
printk(KERN_ERR "rb532: cannot remap GPIO register 0\n");
return -ENXIO;
}
/* Register our GPIO chip */
gpiochip_add(&rb532_gpio_chip->chip);
r = rb532_dev3_ctl_res;
dev3.base = ioremap_nocache(r->start, r->end - r->start);
if (!dev3.base) {
printk(KERN_ERR "rb532: cannot remap device controller 3\n");
return -ENXIO;
}
return 0;
}
arch_initcall(rb532_gpio_init);
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