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SubjectRe: [PATCH 2/3 v2] GPIO: gpio-dwapb: Support Debounce
Date
On Fri, 2014-09-05 at 07:53 -0700, Weike Chen wrote:
> This patch enables 'debounce' for the designware GPIO, and
> it is based on Josef Ahmad's previous work.

Can we split dwapb_read/write introducing and changing from this patch
to a separate one?


> Reviewed-by: Hock Leong Kweh <hock.leong.kweh@intel.com>
> Reviewed-by: Shevchenko, Andriy <andriy.shevchenko@intel.com>


> Signed-off-by: Weike Chen <alvin.chen@intel.com>
> ---
> drivers/gpio/gpio-dwapb.c | 62 +++++++++++++++++++++++++++++++++++++--------
> 1 file changed, 52 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> index f2264a2..6db7501 100644
> --- a/drivers/gpio/gpio-dwapb.c
> +++ b/drivers/gpio/gpio-dwapb.c
> @@ -36,6 +36,7 @@
> #define GPIO_INTTYPE_LEVEL 0x38
> #define GPIO_INT_POLARITY 0x3c
> #define GPIO_INTSTATUS 0x40
> +#define GPIO_PORTA_DEBOUNCE 0x48
> #define GPIO_PORTA_EOI 0x4c
> #define GPIO_EXT_PORTA 0x50
> #define GPIO_EXT_PORTB 0x54
> @@ -63,6 +64,23 @@ struct dwapb_gpio {
> struct irq_domain *domain;
> };
>
> +static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset)
> +{
> + struct bgpio_chip *bgc = &gpio->ports[0].bgc;
> + void __iomem *reg_base = gpio->regs;
> +
> + return bgc->read_reg(reg_base + offset);
> +}
> +
> +static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
> + u32 val)
> +{
> + struct bgpio_chip *bgc = &gpio->ports[0].bgc;
> + void __iomem *reg_base = gpio->regs;
> +
> + bgc->write_reg(reg_base + offset, val);
> +}
> +
> static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
> {
> struct bgpio_chip *bgc = to_bgpio_chip(gc);
> @@ -75,14 +93,14 @@ static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
>
> static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs)
> {
> - u32 v = readl(gpio->regs + GPIO_INT_POLARITY);
> + u32 v = dwapb_read(gpio, GPIO_INT_POLARITY);
>
> if (gpio_get_value(gpio->ports[0].bgc.gc.base + offs))
> v &= ~BIT(offs);
> else
> v |= BIT(offs);
>
> - writel(v, gpio->regs + GPIO_INT_POLARITY);
> + dwapb_write(gpio, GPIO_INT_POLARITY, v);
> }
>
> static u32 _dwapb_irq_handler(struct dwapb_gpio *gpio)
> @@ -125,9 +143,9 @@ static void dwapb_irq_enable(struct irq_data *d)
> u32 val;
>
> spin_lock_irqsave(&bgc->lock, flags);
> - val = readl(gpio->regs + GPIO_INTEN);
> + val = dwapb_read(gpio, GPIO_INTEN);
> val |= BIT(d->hwirq);
> - writel(val, gpio->regs + GPIO_INTEN);
> + dwapb_write(gpio, GPIO_INTEN, val);
> spin_unlock_irqrestore(&bgc->lock, flags);
> }
>
> @@ -140,9 +158,9 @@ static void dwapb_irq_disable(struct irq_data *d)
> u32 val;
>
> spin_lock_irqsave(&bgc->lock, flags);
> - val = readl(gpio->regs + GPIO_INTEN);
> + val = dwapb_read(gpio, GPIO_INTEN);
> val &= ~BIT(d->hwirq);
> - writel(val, gpio->regs + GPIO_INTEN);
> + dwapb_write(gpio, GPIO_INTEN, val);
> spin_unlock_irqrestore(&bgc->lock, flags);
> }
>
> @@ -182,8 +200,8 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type)
> return -EINVAL;
>
> spin_lock_irqsave(&bgc->lock, flags);
> - level = readl(gpio->regs + GPIO_INTTYPE_LEVEL);
> - polarity = readl(gpio->regs + GPIO_INT_POLARITY);
> + level = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
> + polarity = dwapb_read(gpio, GPIO_INT_POLARITY);
>
> switch (type) {
> case IRQ_TYPE_EDGE_BOTH:
> @@ -210,8 +228,31 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type)
>
> irq_setup_alt_chip(d, type);
>
> - writel(level, gpio->regs + GPIO_INTTYPE_LEVEL);
> - writel(polarity, gpio->regs + GPIO_INT_POLARITY);
> + dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level);
> + dwapb_write(gpio, GPIO_INT_POLARITY, polarity);
> + spin_unlock_irqrestore(&bgc->lock, flags);
> +
> + return 0;
> +}
> +
> +static int dwapb_gpio_set_debounce(struct gpio_chip *gc,
> + unsigned offset, unsigned debounce)
> +{
> + struct bgpio_chip *bgc = to_bgpio_chip(gc);
> + struct dwapb_gpio_port *port =
> + container_of(bgc, struct dwapb_gpio_port, bgc);
> + struct dwapb_gpio *gpio = port->gpio;
> + unsigned long flags, val_deb;
> + unsigned long mask = bgc->pin2mask(bgc, offset);
> +
> + spin_lock_irqsave(&bgc->lock, flags);
> +
> + val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
> + if (debounce)
> + dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, mask | val_deb);
> + else
> + dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ~mask & val_deb);
> +
> spin_unlock_irqrestore(&bgc->lock, flags);
>
> return 0;
> @@ -354,6 +395,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
> #endif
> port->bgc.gc.ngpio = pp->ngpio;
> port->bgc.gc.base = pp->gpio_base;
> + port->bgc.gc.set_debounce = dwapb_gpio_set_debounce;
>
> if (pp->irq)
> dwapb_configure_irqs(gpio, port, pp);


--
Andy Shevchenko <andriy.shevchenko@intel.com>
Intel Finland Oy
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