mirror of https://gitee.com/openkylin/linux.git
ARM: 6148/1: nomadik-gpio: add function to configure pullup/pulldown
Cc: Alessandro Rubini <rubini@unipv.it> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -46,6 +46,54 @@ struct nmk_gpio_chip {
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u32 edge_falling;
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};
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static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
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unsigned offset, enum nmk_gpio_pull pull)
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{
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u32 bit = 1 << offset;
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u32 pdis;
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pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
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if (pull == NMK_GPIO_PULL_NONE)
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pdis |= bit;
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else
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pdis &= ~bit;
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writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
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if (pull == NMK_GPIO_PULL_UP)
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writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
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else if (pull == NMK_GPIO_PULL_DOWN)
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writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
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}
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/**
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* nmk_gpio_set_pull() - enable/disable pull up/down on a gpio
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* @gpio: pin number
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* @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE
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*
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* Enables/disables pull up/down on a specified pin. This only takes effect if
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* the pin is configured as an input (either explicitly or by the alternate
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* function).
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*
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* NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
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* configured as an input. Otherwise, due to the way the controller registers
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* work, this function will change the value output on the pin.
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*/
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int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull)
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{
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struct nmk_gpio_chip *nmk_chip;
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unsigned long flags;
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nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
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if (!nmk_chip)
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return -EINVAL;
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spin_lock_irqsave(&nmk_chip->lock, flags);
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__nmk_gpio_set_pull(nmk_chip, gpio - nmk_chip->chip.base, pull);
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spin_unlock_irqrestore(&nmk_chip->lock, flags);
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return 0;
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}
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/* Mode functions */
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int nmk_gpio_set_mode(int gpio, int gpio_mode)
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{
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@ -55,6 +55,14 @@
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#define NMK_GPIO_ALT_B 2
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#define NMK_GPIO_ALT_C (NMK_GPIO_ALT_A | NMK_GPIO_ALT_B)
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/* Pull up/down values */
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enum nmk_gpio_pull {
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NMK_GPIO_PULL_NONE,
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NMK_GPIO_PULL_UP,
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NMK_GPIO_PULL_DOWN,
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};
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extern int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull);
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extern int nmk_gpio_set_mode(int gpio, int gpio_mode);
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extern int nmk_gpio_get_mode(int gpio);
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