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gpio-mpc8xxx: add mpc8xxx_gpio_set_multiple function

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Add a set_multiple function to the MPC8xxx GPIO chip driver and thereby allow
for actual performance improvements when setting multiple outputs
simultaneously. In my case the time needed to configure an FPGA goes down from
48 s to 20 s.

Change log:
  v6: - rebase on current linux-gpio devel branch
  v5: - no change
  v4: - change interface of the set_multiple driver function to use
        unsigned long as type for the bit fields
      - use generic bitops (which also use unsigned long for bit fields)
  v3: - change commit message
  v2: - add this patch (v1 included only changes to gpiolib)

Signed-off-by: Rojhalat Ibrahim <imr@rtschenk.de>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Rojhalat Ibrahim 2014-11-04 17:12:09 +01:00 committed by Linus Walleij
parent 5f42424354
commit e5db3b338a
1 changed files with 27 additions and 0 deletions
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27
drivers/gpio/gpio-mpc8xxx.c
View File

@ -105,6 +105,32 @@ static void mpc8xxx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
}
static void mpc8xxx_gpio_set_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
unsigned long flags;
int i;
spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
for (i = 0; i < gc->ngpio; i++) {
if (*mask == 0)
break;
if (__test_and_clear_bit(i, mask)) {
if (test_bit(i, bits))
mpc8xxx_gc->data |= mpc8xxx_gpio2mask(i);
else
mpc8xxx_gc->data &= ~mpc8xxx_gpio2mask(i);
}
}
out_be32(mm->regs + GPIO_DAT, mpc8xxx_gc->data);
spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
}
static int mpc8xxx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
@ -344,6 +370,7 @@ static void __init mpc8xxx_add_controller(struct device_node *np)
gc->get = of_device_is_compatible(np, "fsl,mpc8572-gpio") ?
mpc8572_gpio_get : mpc8xxx_gpio_get;
gc->set = mpc8xxx_gpio_set;
gc->set_multiple = mpc8xxx_gpio_set_multiple;
gc->to_irq = mpc8xxx_gpio_to_irq;
ret = of_mm_gpiochip_add(np, mm_gc);