[PATCH 1/2] pinctrl: at91: Add set_multiple GPIO chip feature
From: Alexander Stein <hidden>
Date: 2015-03-20 19:12:51
Also in:
linux-gpio
Subsystem:
pin control subsystem, pin controller - microchip at91, the rest · Maintainers:
Linus Walleij, Ludovic Desroches, Linus Torvalds
This adds the callback for set_multiple. As this controller has a separate set and clear register, we can't write directly to PIO_ODSR as this would required a cached variable and would race with at91_gpio_set. So build masks for the PIO_SODR and PIO_CODR registers and write them together. Signed-off-by: Alexander Stein <redacted> --- This was tested by using an own test driver which uses gpiod_set_array_cansleep to set multiple GPIOs at once. drivers/pinctrl/pinctrl-at91.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index f4cd0b9..a882523 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c@@ -1330,6 +1330,33 @@ static void at91_gpio_set(struct gpio_chip *chip, unsigned offset, writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR)); } +static void at91_gpio_set_multiple(struct gpio_chip *chip, + unsigned long *mask, unsigned long *bits) +{ + struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip); + void __iomem *pio = at91_gpio->regbase; + unsigned long set_mask; + unsigned long clear_mask; + size_t i; + + set_mask = 0; + clear_mask = 0; + + for (i = 0; i < chip->ngpio; i++) { + if (*mask == 0) + break; + if (__test_and_clear_bit(i, mask)) { + if (test_bit(i, bits)) + set_mask |= BIT(i); + else + clear_mask |= BIT(i); + } + } + + writel_relaxed(set_mask, pio + PIO_SODR); + writel_relaxed(clear_mask, pio + PIO_CODR); +} + static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int val) {
@@ -1692,6 +1719,7 @@ static struct gpio_chip at91_gpio_template = { .get = at91_gpio_get, .direction_output = at91_gpio_direction_output, .set = at91_gpio_set, + .set_multiple = at91_gpio_set_multiple, .dbg_show = at91_gpio_dbg_show, .can_sleep = false, .ngpio = MAX_NB_GPIO_PER_BANK,
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2.3.3