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gpio/mxc: convert gpio-mxc to use basic_mmio_gpio library

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The gpio-mxc controller complies with basic_mmio_gpio library.  The
patch convert the driver to use the library.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Shawn Guo 2011-06-06 13:22:41 +08:00 committed by Grant Likely
parent b78d8e59a6
commit 2ce420da39
2 changed files with 16 additions and 70 deletions
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1
drivers/gpio/Kconfig
View file

@ -100,6 +100,7 @@ config GPIO_MXS
config GPIO_MXC config GPIO_MXC
def_bool y def_bool y
depends on ARCH_MXC depends on ARCH_MXC
select GPIO_BASIC_MMIO_CORE
config GPIO_PLAT_SAMSUNG config GPIO_PLAT_SAMSUNG
bool "Samsung SoCs GPIO library support" bool "Samsung SoCs GPIO library support"

85
drivers/gpio/gpio-mxc.c
View file

@ -26,6 +26,7 @@
#include <linux/gpio.h> #include <linux/gpio.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/basic_mmio_gpio.h>
#include <mach/hardware.h> #include <mach/hardware.h>
#include <asm-generic/bug.h> #include <asm-generic/bug.h>
@ -35,9 +36,8 @@ struct mxc_gpio_port {
int irq; int irq;
int irq_high; int irq_high;
int virtual_irq_start; int virtual_irq_start;
struct gpio_chip chip; struct bgpio_chip bgc;
u32 both_edges; u32 both_edges;
spinlock_t lock;
}; };
/* /*
@ -101,8 +101,6 @@ static void gpio_unmask_irq(struct irq_data *d)
_set_gpio_irqenable(port, gpio & 0x1f, 1); _set_gpio_irqenable(port, gpio & 0x1f, 1);
} }
static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset);
static int gpio_set_irq_type(struct irq_data *d, u32 type) static int gpio_set_irq_type(struct irq_data *d, u32 type)
{ {
u32 gpio = irq_to_gpio(d->irq); u32 gpio = irq_to_gpio(d->irq);
@ -120,7 +118,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
edge = GPIO_INT_FALL_EDGE; edge = GPIO_INT_FALL_EDGE;
break; break;
case IRQ_TYPE_EDGE_BOTH: case IRQ_TYPE_EDGE_BOTH:
val = mxc_gpio_get(&port->chip, gpio & 31); val = gpio_get_value(gpio & 31);
if (val) { if (val) {
edge = GPIO_INT_LOW_LEV; edge = GPIO_INT_LOW_LEV;
pr_debug("mxc: set GPIO %d to low trigger\n", gpio); pr_debug("mxc: set GPIO %d to low trigger\n", gpio);
@ -259,60 +257,6 @@ static struct irq_chip gpio_irq_chip = {
.irq_set_wake = gpio_set_wake_irq, .irq_set_wake = gpio_set_wake_irq,
}; };
static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset,
int dir)
{
struct mxc_gpio_port *port =
container_of(chip, struct mxc_gpio_port, chip);
u32 l;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
l = readl(port->base + GPIO_GDIR);
if (dir)
l |= 1 << offset;
else
l &= ~(1 << offset);
writel(l, port->base + GPIO_GDIR);
spin_unlock_irqrestore(&port->lock, flags);
}
static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct mxc_gpio_port *port =
container_of(chip, struct mxc_gpio_port, chip);
void __iomem *reg = port->base + GPIO_DR;
u32 l;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
l = (readl(reg) & (~(1 << offset))) | (!!value << offset);
writel(l, reg);
spin_unlock_irqrestore(&port->lock, flags);
}
static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct mxc_gpio_port *port =
container_of(chip, struct mxc_gpio_port, chip);
return (readl(port->base + GPIO_PSR) >> offset) & 1;
}
static int mxc_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
_set_gpio_direction(chip, offset, 0);
return 0;
}
static int mxc_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
mxc_gpio_set(chip, offset, value);
_set_gpio_direction(chip, offset, 1);
return 0;
}
/* /*
* This lock class tells lockdep that GPIO irqs are in a different * This lock class tells lockdep that GPIO irqs are in a different
* category than their parents, so it won't report false recursion. * category than their parents, so it won't report false recursion.
@ -385,24 +329,25 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
} }
} }
/* register gpio chip */ err = bgpio_init(&port->bgc, &pdev->dev, 4,
port->chip.direction_input = mxc_gpio_direction_input; port->base + GPIO_PSR,
port->chip.direction_output = mxc_gpio_direction_output; port->base + GPIO_DR, NULL,
port->chip.get = mxc_gpio_get; port->base + GPIO_GDIR, NULL, false);
port->chip.set = mxc_gpio_set;
port->chip.base = pdev->id * 32;
port->chip.ngpio = 32;
spin_lock_init(&port->lock);
err = gpiochip_add(&port->chip);
if (err) if (err)
goto out_iounmap; goto out_iounmap;
port->bgc.gc.base = pdev->id * 32;
err = gpiochip_add(&port->bgc.gc);
if (err)
goto out_bgpio_remove;
list_add_tail(&port->node, &mxc_gpio_ports); list_add_tail(&port->node, &mxc_gpio_ports);
return 0; return 0;
out_bgpio_remove:
bgpio_remove(&port->bgc);
out_iounmap: out_iounmap:
iounmap(port->base); iounmap(port->base);
out_release_mem: out_release_mem: