diff options
Diffstat (limited to 'drivers/gpio/gpio-zynq.c')
| -rw-r--r-- | drivers/gpio/gpio-zynq.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c index c0c53fdbf07d..c3145f91fda3 100644 --- a/drivers/gpio/gpio-zynq.c +++ b/drivers/gpio/gpio-zynq.c @@ -301,6 +301,48 @@ static void zynq_gpio_irq_unmask(struct irq_data *irq_data) } /** + * zynq_gpio_irq_ack - Acknowledge the interrupt of a gpio pin + * @irq_data: irq data containing irq number of gpio pin for the interrupt + * to ack + * + * This function calculates gpio pin number from irq number and sets the bit + * in the Interrupt Status Register of the corresponding bank, to ACK the irq. + */ +static void zynq_gpio_irq_ack(struct irq_data *irq_data) +{ + unsigned int device_pin_num, bank_num, bank_pin_num; + struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data); + + device_pin_num = irq_data->hwirq; + zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num); + writel_relaxed(BIT(bank_pin_num), + gpio->base_addr + ZYNQ_GPIO_INTSTS_OFFSET(bank_num)); +} + +/** + * zynq_gpio_irq_enable - Enable the interrupts for a gpio pin + * @irq_data: irq data containing irq number of gpio pin for the interrupt + * to enable + * + * Clears the INTSTS bit and unmasks the given interrrupt. + */ +static void zynq_gpio_irq_enable(struct irq_data *irq_data) +{ + /* + * The Zynq GPIO controller does not disable interrupt detection when + * the interrupt is masked and only disables the propagation of the + * interrupt. This means when the controller detects an interrupt + * condition while the interrupt is logically disabled it will propagate + * that interrupt event once the interrupt is enabled. This will cause + * the interrupt consumer to see spurious interrupts to prevent this + * first make sure that the interrupt is not asserted and then enable + * it. + */ + zynq_gpio_irq_ack(irq_data); + zynq_gpio_irq_unmask(irq_data); +} + +/** * zynq_gpio_set_irq_type - Set the irq type for a gpio pin * @irq_data: irq data containing irq number of gpio pin * @type: interrupt type that is to be set for the gpio pin @@ -384,6 +426,7 @@ static int zynq_gpio_set_wake(struct irq_data *data, unsigned int on) /* irq chip descriptor */ static struct irq_chip zynq_gpio_irqchip = { .name = DRIVER_NAME, + .irq_enable = zynq_gpio_irq_enable, .irq_mask = zynq_gpio_irq_mask, .irq_unmask = zynq_gpio_irq_unmask, .irq_set_type = zynq_gpio_set_irq_type, |