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gpio: pl061: convert to use generic irq chip 

Convert the pl061 irq_chip code to use the generic irq chip code.

This has the side effect of using 32-bit accesses rather than 8-bit
accesses to interrupt registers. The h/w TRM and testing seem to indicate
this is fine.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Rob Herring 2011-10-21 08:05:53 -05:00
parent 2b84112718
commit 3ab5247544
2 changed files with 27 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpio/Kconfig
View File

@ -138,6 +138,7 @@ config GPIO_MXS
config GPIO_PL061
bool "PrimeCell PL061 GPIO support"
depends on ARM_AMBA
select GENERIC_IRQ_CHIP
help
Say yes here to support the PrimeCell PL061 GPIO device

74
drivers/gpio/gpio-pl061.c
View File

@ -50,10 +50,10 @@ struct pl061_gpio {
* the IRQ code simpler.
*/
spinlock_t lock; /* GPIO registers */
spinlock_t irq_lock; /* IRQ registers */
void __iomem *base;
int irq_base;
struct irq_chip_generic *irq_gc;
struct gpio_chip gc;
};
@ -125,40 +125,10 @@ static int pl061_to_irq(struct gpio_chip *gc, unsigned offset)
return chip->irq_base + offset;
}
/*
* PL061 GPIO IRQ
*/
static void pl061_irq_disable(struct irq_data *d)
{
struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
int offset = d->irq - chip->irq_base;
unsigned long flags;
u8 gpioie;
spin_lock_irqsave(&chip->irq_lock, flags);
gpioie = readb(chip->base + GPIOIE);
gpioie &= ~(1 << offset);
writeb(gpioie, chip->base + GPIOIE);
spin_unlock_irqrestore(&chip->irq_lock, flags);
}
static void pl061_irq_enable(struct irq_data *d)
{
struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
int offset = d->irq - chip->irq_base;
unsigned long flags;
u8 gpioie;
spin_lock_irqsave(&chip->irq_lock, flags);
gpioie = readb(chip->base + GPIOIE);
gpioie |= 1 << offset;
writeb(gpioie, chip->base + GPIOIE);
spin_unlock_irqrestore(&chip->irq_lock, flags);
}
static int pl061_irq_type(struct irq_data *d, unsigned trigger)
{
struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct pl061_gpio *chip = gc->private;
int offset = d->irq - chip->irq_base;
unsigned long flags;
u8 gpiois, gpioibe, gpioiev;
@ -166,7 +136,7 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
if (offset < 0 || offset >= PL061_GPIO_NR)
return -EINVAL;
spin_lock_irqsave(&chip->irq_lock, flags);
raw_spin_lock_irqsave(&gc->lock, flags);
gpioiev = readb(chip->base + GPIOIEV);
@ -195,18 +165,11 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
writeb(gpioiev, chip->base + GPIOIEV);
spin_unlock_irqrestore(&chip->irq_lock, flags);
raw_spin_unlock_irqrestore(&gc->lock, flags);
return 0;
}
static struct irq_chip pl061_irqchip = {
.name = "GPIO",
.irq_enable = pl061_irq_enable,
.irq_disable = pl061_irq_disable,
.irq_set_type = pl061_irq_type,
};
static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
{
struct list_head *chip_list = irq_get_handler_data(irq);
@ -232,6 +195,25 @@ static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
chained_irq_exit(irqchip, desc);
}
static void __init pl061_init_gc(struct pl061_gpio *chip, int irq_base)
{
struct irq_chip_type *ct;
chip->irq_gc = irq_alloc_generic_chip("gpio-pl061", 1, irq_base,
chip->base, handle_simple_irq);
chip->irq_gc->private = chip;
ct = chip->irq_gc->chip_types;
ct->chip.irq_mask = irq_gc_mask_clr_bit;
ct->chip.irq_unmask = irq_gc_mask_set_bit;
ct->chip.irq_set_type = pl061_irq_type;
ct->chip.irq_set_wake = irq_gc_set_wake;
ct->regs.mask = GPIOIE;
irq_setup_generic_chip(chip->irq_gc, IRQ_MSK(PL061_GPIO_NR),
IRQ_GC_INIT_NESTED_LOCK, IRQ_NOREQUEST, 0);
}
static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
{
struct pl061_platform_data *pdata;
@ -269,7 +251,6 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
}
spin_lock_init(&chip->lock);
spin_lock_init(&chip->irq_lock);
INIT_LIST_HEAD(&chip->list);
chip->gc.direction_input = pl061_direction_input;
@ -293,6 +274,8 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
if (chip->irq_base <= 0)
return 0;
pl061_init_gc(chip, chip->irq_base);
writeb(0, chip->base + GPIOIE); /* disable irqs */
irq = dev->irq[0];
if (irq < 0) {
@ -321,11 +304,6 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
else
pl061_direction_input(&chip->gc, i);
}
irq_set_chip_and_handler(i + chip->irq_base, &pl061_irqchip,
handle_simple_irq);
set_irq_flags(i+chip->irq_base, IRQF_VALID);
irq_set_chip_data(i + chip->irq_base, chip);
}
return 0;