Commit e5db3b33 authored by Rojhalat Ibrahim's avatar Rojhalat Ibrahim Committed by Linus Walleij

gpio-mpc8xxx: add mpc8xxx_gpio_set_multiple function

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: default avatarRojhalat Ibrahim <imr@rtschenk.de>
Reviewed-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 5f424243
...@@ -105,6 +105,32 @@ static void mpc8xxx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) ...@@ -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); 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) 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); 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) ...@@ -344,6 +370,7 @@ static void __init mpc8xxx_add_controller(struct device_node *np)
gc->get = of_device_is_compatible(np, "fsl,mpc8572-gpio") ? gc->get = of_device_is_compatible(np, "fsl,mpc8572-gpio") ?
mpc8572_gpio_get : mpc8xxx_gpio_get; mpc8572_gpio_get : mpc8xxx_gpio_get;
gc->set = mpc8xxx_gpio_set; gc->set = mpc8xxx_gpio_set;
gc->set_multiple = mpc8xxx_gpio_set_multiple;
gc->to_irq = mpc8xxx_gpio_to_irq; gc->to_irq = mpc8xxx_gpio_to_irq;
ret = of_mm_gpiochip_add(np, mm_gc); ret = of_mm_gpiochip_add(np, mm_gc);
......
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