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author | Linus Walleij <linus.walleij@linaro.org> | 2017-10-20 16:31:27 +0200 |
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committer | Linus Walleij <linus.walleij@linaro.org> | 2017-10-25 11:25:41 +0200 |
commit | 24efd94bc38290dc1d9775a1e767ed4685d8a79b (patch) | |
tree | 32e698c490b7ec9159ea16757a03c94af6341656 /drivers/gpio/gpio-mmio.c | |
parent | b3222f7147e028d31f965f193b6f995147c64651 (diff) | |
download | linux-24efd94bc38290dc1d9775a1e767ed4685d8a79b.tar.gz linux-24efd94bc38290dc1d9775a1e767ed4685d8a79b.tar.bz2 linux-24efd94bc38290dc1d9775a1e767ed4685d8a79b.zip |
gpio: mmio: Make pin2mask() a private business
The vtable call pin2mask() was introducing a vtable function call
in every gpiochip callback for a generic MMIO GPIO chip. This was
not exactly efficient. (Maybe link-time optimization could get rid of
it, I don't know.)
After removing all external calls into this API we can make it a
boolean flag in the struct gpio_chip call and sink the function into
the gpio-mmio driver yielding encapsulation and potential speedups.
Cc: Anton Vorontsov <anton@enomsg.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-mmio.c')
-rw-r--r-- | drivers/gpio/gpio-mmio.c | 45 |
1 files changed, 19 insertions, 26 deletions
diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c index f7da40e46c55..63bb48878de1 100644 --- a/drivers/gpio/gpio-mmio.c +++ b/drivers/gpio/gpio-mmio.c @@ -126,20 +126,16 @@ static unsigned long bgpio_read32be(void __iomem *reg) return ioread32be(reg); } -static unsigned long bgpio_pin2mask(struct gpio_chip *gc, unsigned int pin) +static unsigned long bgpio_line2mask(struct gpio_chip *gc, unsigned int line) { - return BIT(pin); -} - -static unsigned long bgpio_pin2mask_be(struct gpio_chip *gc, - unsigned int pin) -{ - return BIT(gc->bgpio_bits - 1 - pin); + if (gc->be_bits) + return BIT(gc->bgpio_bits - 1 - line); + return BIT(line); } static int bgpio_get_set(struct gpio_chip *gc, unsigned int gpio) { - unsigned long pinmask = gc->pin2mask(gc, gpio); + unsigned long pinmask = bgpio_line2mask(gc, gpio); if (gc->bgpio_dir & pinmask) return !!(gc->read_reg(gc->reg_set) & pinmask); @@ -149,7 +145,7 @@ static int bgpio_get_set(struct gpio_chip *gc, unsigned int gpio) static int bgpio_get(struct gpio_chip *gc, unsigned int gpio) { - return !!(gc->read_reg(gc->reg_dat) & gc->pin2mask(gc, gpio)); + return !!(gc->read_reg(gc->reg_dat) & bgpio_line2mask(gc, gpio)); } static void bgpio_set_none(struct gpio_chip *gc, unsigned int gpio, int val) @@ -158,7 +154,7 @@ static void bgpio_set_none(struct gpio_chip *gc, unsigned int gpio, int val) static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val) { - unsigned long mask = gc->pin2mask(gc, gpio); + unsigned long mask = bgpio_line2mask(gc, gpio); unsigned long flags; spin_lock_irqsave(&gc->bgpio_lock, flags); @@ -176,7 +172,7 @@ static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val) static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio, int val) { - unsigned long mask = gc->pin2mask(gc, gpio); + unsigned long mask = bgpio_line2mask(gc, gpio); if (val) gc->write_reg(gc->reg_set, mask); @@ -186,7 +182,7 @@ static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio, static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val) { - unsigned long mask = gc->pin2mask(gc, gpio); + unsigned long mask = bgpio_line2mask(gc, gpio); unsigned long flags; spin_lock_irqsave(&gc->bgpio_lock, flags); @@ -216,9 +212,9 @@ static void bgpio_multiple_get_masks(struct gpio_chip *gc, break; if (__test_and_clear_bit(i, mask)) { if (test_bit(i, bits)) - *set_mask |= gc->pin2mask(gc, i); + *set_mask |= bgpio_line2mask(gc, i); else - *clear_mask |= gc->pin2mask(gc, i); + *clear_mask |= bgpio_line2mask(gc, i); } } } @@ -294,7 +290,7 @@ static int bgpio_dir_in(struct gpio_chip *gc, unsigned int gpio) spin_lock_irqsave(&gc->bgpio_lock, flags); - gc->bgpio_dir &= ~gc->pin2mask(gc, gpio); + gc->bgpio_dir &= ~bgpio_line2mask(gc, gpio); gc->write_reg(gc->reg_dir, gc->bgpio_dir); spin_unlock_irqrestore(&gc->bgpio_lock, flags); @@ -305,7 +301,7 @@ static int bgpio_dir_in(struct gpio_chip *gc, unsigned int gpio) static int bgpio_get_dir(struct gpio_chip *gc, unsigned int gpio) { /* Return 0 if output, 1 of input */ - return !(gc->read_reg(gc->reg_dir) & gc->pin2mask(gc, gpio)); + return !(gc->read_reg(gc->reg_dir) & bgpio_line2mask(gc, gpio)); } static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) @@ -316,7 +312,7 @@ static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) spin_lock_irqsave(&gc->bgpio_lock, flags); - gc->bgpio_dir |= gc->pin2mask(gc, gpio); + gc->bgpio_dir |= bgpio_line2mask(gc, gpio); gc->write_reg(gc->reg_dir, gc->bgpio_dir); spin_unlock_irqrestore(&gc->bgpio_lock, flags); @@ -330,7 +326,7 @@ static int bgpio_dir_in_inv(struct gpio_chip *gc, unsigned int gpio) spin_lock_irqsave(&gc->bgpio_lock, flags); - gc->bgpio_dir |= gc->pin2mask(gc, gpio); + gc->bgpio_dir |= bgpio_line2mask(gc, gpio); gc->write_reg(gc->reg_dir, gc->bgpio_dir); spin_unlock_irqrestore(&gc->bgpio_lock, flags); @@ -346,7 +342,7 @@ static int bgpio_dir_out_inv(struct gpio_chip *gc, unsigned int gpio, int val) spin_lock_irqsave(&gc->bgpio_lock, flags); - gc->bgpio_dir &= ~gc->pin2mask(gc, gpio); + gc->bgpio_dir &= ~bgpio_line2mask(gc, gpio); gc->write_reg(gc->reg_dir, gc->bgpio_dir); spin_unlock_irqrestore(&gc->bgpio_lock, flags); @@ -357,12 +353,11 @@ static int bgpio_dir_out_inv(struct gpio_chip *gc, unsigned int gpio, int val) static int bgpio_get_dir_inv(struct gpio_chip *gc, unsigned int gpio) { /* Return 0 if output, 1 if input */ - return !!(gc->read_reg(gc->reg_dir) & gc->pin2mask(gc, gpio)); + return !!(gc->read_reg(gc->reg_dir) & bgpio_line2mask(gc, gpio)); } static int bgpio_setup_accessors(struct device *dev, struct gpio_chip *gc, - bool bit_be, bool byte_be) { @@ -406,8 +401,6 @@ static int bgpio_setup_accessors(struct device *dev, return -EINVAL; } - gc->pin2mask = bit_be ? bgpio_pin2mask_be : bgpio_pin2mask; - return 0; } @@ -531,8 +524,8 @@ int bgpio_init(struct gpio_chip *gc, struct device *dev, if (ret) return ret; - ret = bgpio_setup_accessors(dev, gc, flags & BGPIOF_BIG_ENDIAN, - flags & BGPIOF_BIG_ENDIAN_BYTE_ORDER); + gc->be_bits = !!(flags & BGPIOF_BIG_ENDIAN); + ret = bgpio_setup_accessors(dev, gc, flags & BGPIOF_BIG_ENDIAN_BYTE_ORDER); if (ret) return ret; |