diff options
author | Rojhalat Ibrahim <imr@rtschenk.de> | 2015-01-14 15:46:38 +0100 |
---|---|---|
committer | Linus Walleij <linus.walleij@linaro.org> | 2015-01-19 11:07:00 +0100 |
commit | 73c4ceda09db2c9a2ff8bb2e90cc98ce1a827c34 (patch) | |
tree | 9faaca3e916d5e87f6083643fc2942d815d1b253 | |
parent | 513858585202171d7603024ea65659335df4c8e9 (diff) | |
download | linux-73c4ceda09db2c9a2ff8bb2e90cc98ce1a827c34.tar.bz2 |
gpio-generic: add bgpio_set_multiple functions
Add set_multiple functions to the generic driver for memory-mapped GPIO
controllers to improve performance when setting multiple outputs
simultaneously.
Signed-off-by: Rojhalat Ibrahim <imr@rtschenk.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r-- | drivers/gpio/gpio-generic.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c index 16f6115e5bdb..b92a690f5765 100644 --- a/drivers/gpio/gpio-generic.c +++ b/drivers/gpio/gpio-generic.c @@ -190,6 +190,79 @@ static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val) spin_unlock_irqrestore(&bgc->lock, flags); } +static void bgpio_multiple_get_masks(struct bgpio_chip *bgc, + unsigned long *mask, unsigned long *bits, + unsigned long *set_mask, + unsigned long *clear_mask) +{ + int i; + + *set_mask = 0; + *clear_mask = 0; + + for (i = 0; i < bgc->bits; i++) { + if (*mask == 0) + break; + if (__test_and_clear_bit(i, mask)) { + if (test_bit(i, bits)) + *set_mask |= bgc->pin2mask(bgc, i); + else + *clear_mask |= bgc->pin2mask(bgc, i); + } + } +} + +static void bgpio_set_multiple_single_reg(struct bgpio_chip *bgc, + unsigned long *mask, + unsigned long *bits, + void __iomem *reg) +{ + unsigned long flags; + unsigned long set_mask, clear_mask; + + spin_lock_irqsave(&bgc->lock, flags); + + bgpio_multiple_get_masks(bgc, mask, bits, &set_mask, &clear_mask); + + bgc->data |= set_mask; + bgc->data &= ~clear_mask; + + bgc->write_reg(reg, bgc->data); + + spin_unlock_irqrestore(&bgc->lock, flags); +} + +static void bgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, + unsigned long *bits) +{ + struct bgpio_chip *bgc = to_bgpio_chip(gc); + + bgpio_set_multiple_single_reg(bgc, mask, bits, bgc->reg_dat); +} + +static void bgpio_set_multiple_set(struct gpio_chip *gc, unsigned long *mask, + unsigned long *bits) +{ + struct bgpio_chip *bgc = to_bgpio_chip(gc); + + bgpio_set_multiple_single_reg(bgc, mask, bits, bgc->reg_set); +} + +static void bgpio_set_multiple_with_clear(struct gpio_chip *gc, + unsigned long *mask, + unsigned long *bits) +{ + struct bgpio_chip *bgc = to_bgpio_chip(gc); + unsigned long set_mask, clear_mask; + + bgpio_multiple_get_masks(bgc, mask, bits, &set_mask, &clear_mask); + + if (set_mask) + bgc->write_reg(bgc->reg_set, set_mask); + if (clear_mask) + bgc->write_reg(bgc->reg_clr, clear_mask); +} + static int bgpio_simple_dir_in(struct gpio_chip *gc, unsigned int gpio) { return 0; @@ -354,11 +427,14 @@ static int bgpio_setup_io(struct bgpio_chip *bgc, bgc->reg_set = set; bgc->reg_clr = clr; bgc->gc.set = bgpio_set_with_clear; + bgc->gc.set_multiple = bgpio_set_multiple_with_clear; } else if (set && !clr) { bgc->reg_set = set; bgc->gc.set = bgpio_set_set; + bgc->gc.set_multiple = bgpio_set_multiple_set; } else { bgc->gc.set = bgpio_set; + bgc->gc.set_multiple = bgpio_set_multiple; } bgc->gc.get = bgpio_get; |