diff options
| author | Gwenhael Goavec-Merou <gwenhael.goavec-merou@armadeus.com> | 2013-01-29 08:16:33 (GMT) |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2013-01-29 11:02:05 (GMT) |
| commit | 66d7990e282f8015686b9bab30be30eec297e736 (patch) | |
| tree | 539def58cb73bb84493def504fc4e6354990aa10 | |
| parent | 0d1c28a449c6c23a126e3a08ee30914609aac227 (diff) | |
| download | linux-66d7990e282f8015686b9bab30be30eec297e736.tar.xz | |
gpio: mxs: Add IRQ_TYPE_EDGE_BOTH support
This patch adds support for IRQ_TYPE_EDGE_BOTH needed for some driver
(gpio-keys).
Inspired from gpio-mxc.c
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@armadeus.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpio-mxs.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c index fa2a63c..859b6fa 100644 --- a/drivers/gpio/gpio-mxs.c +++ b/drivers/gpio/gpio-mxs.c @@ -65,6 +65,7 @@ struct mxs_gpio_port { struct irq_domain *domain; struct bgpio_chip bgc; enum mxs_gpio_id devid; + u32 both_edges; }; static inline int is_imx23_gpio(struct mxs_gpio_port *port) @@ -81,13 +82,23 @@ static inline int is_imx28_gpio(struct mxs_gpio_port *port) static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type) { + u32 val; u32 pin_mask = 1 << d->hwirq; struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); struct mxs_gpio_port *port = gc->private; void __iomem *pin_addr; int edge; + port->both_edges &= ~pin_mask; switch (type) { + case IRQ_TYPE_EDGE_BOTH: + val = gpio_get_value(port->bgc.gc.base + d->hwirq); + if (val) + edge = GPIO_INT_FALL_EDGE; + else + edge = GPIO_INT_RISE_EDGE; + port->both_edges |= pin_mask; + break; case IRQ_TYPE_EDGE_RISING: edge = GPIO_INT_RISE_EDGE; break; @@ -124,6 +135,23 @@ static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type) return 0; } +static void mxs_flip_edge(struct mxs_gpio_port *port, u32 gpio) +{ + u32 bit, val, edge; + void __iomem *pin_addr; + + bit = 1 << gpio; + + pin_addr = port->base + PINCTRL_IRQPOL(port); + val = readl(pin_addr); + edge = val & bit; + + if (edge) + writel(bit, pin_addr + MXS_CLR); + else + writel(bit, pin_addr + MXS_SET); +} + /* MXS has one interrupt *per* gpio port */ static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc) { @@ -137,6 +165,9 @@ static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc) while (irq_stat != 0) { int irqoffset = fls(irq_stat) - 1; + if (port->both_edges & (1 << irqoffset)) + mxs_flip_edge(port, irqoffset); + generic_handle_irq(irq_find_mapping(port->domain, irqoffset)); irq_stat &= ~(1 << irqoffset); } |