mirror of https://gitee.com/openkylin/linux.git
ARM: 6149/1: nomadik-gpio: add function to configure sleep mode behaviour
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 +46,20 @@ struct nmk_gpio_chip {
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u32 edge_falling;
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};
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static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
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unsigned offset, enum nmk_gpio_slpm mode)
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{
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u32 bit = 1 << offset;
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u32 slpm;
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slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
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if (mode == NMK_GPIO_SLPM_NOCHANGE)
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slpm |= bit;
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else
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slpm &= ~bit;
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writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
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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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@ -65,6 +79,32 @@ static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
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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_slpm() - configure the sleep mode of a pin
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* @gpio: pin number
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* @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE,
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*
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* Sets the sleep mode of a pin. If @mode is NMK_GPIO_SLPM_INPUT, the pin is
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* changed to an input (with pullup/down enabled) in sleep and deep sleep. If
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* @mode is NMK_GPIO_SLPM_NOCHANGE, the pin remains in the state it was
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* configured even when in sleep and deep sleep.
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*/
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int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
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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_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode);
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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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/**
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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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@ -62,6 +62,13 @@ enum nmk_gpio_pull {
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NMK_GPIO_PULL_DOWN,
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};
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/* Sleep mode */
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enum nmk_gpio_slpm {
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NMK_GPIO_SLPM_INPUT,
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NMK_GPIO_SLPM_NOCHANGE,
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};
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extern int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode);
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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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