diff options
author | Rojhalat Ibrahim <imr@rtschenk.de> | 2014-11-04 17:12:09 +0100 |
---|---|---|
committer | Linus Walleij <linus.walleij@linaro.org> | 2014-11-27 15:01:18 +0100 |
commit | e5db3b338aae35fbdd8b33cef6e2510f42ea4640 (patch) | |
tree | 025dabed161e36892e1eaffff199cdbf83bc6de4 /drivers/gpio | |
parent | gpiolib: allow simultaneous setting of multiple GPIO outputs (diff) | |
download | linux-e5db3b338aae35fbdd8b33cef6e2510f42ea4640.tar.xz linux-e5db3b338aae35fbdd8b33cef6e2510f42ea4640.zip |
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: Rojhalat Ibrahim <imr@rtschenk.de>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r-- | drivers/gpio/gpio-mpc8xxx.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c index d7d6d72eba33..d1ff879e6ff2 100644 --- a/drivers/gpio/gpio-mpc8xxx.c +++ b/drivers/gpio/gpio-mpc8xxx.c @@ -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); |