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>
diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c
index 16f6115..b92a690 100644
--- a/drivers/gpio/gpio-generic.c
+++ b/drivers/gpio/gpio-generic.c
@@ -190,6 +190,79 @@
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 @@
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;