[PATCH 2/2] gpio/mxs: convert gpio-mxs to use generic irq chip

[Grant Likely]

On Tue, Jun 07, 2011 at 10:00:54PM +0800, Shawn Guo wrote:
> The patch converts gpio-mxs driver to use generic irq chip.
> 
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>

Applied, thanks,

g.

> ---
>  drivers/gpio/Kconfig    |    1 +
>  drivers/gpio/gpio-mxs.c |   95 +++++++++++++++++------------------------------
>  2 files changed, 35 insertions(+), 61 deletions(-)
> 
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 0b858e5..59003bf 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -96,6 +96,7 @@ config GPIO_EXYNOS4
>  config GPIO_MXS
>  	def_bool y
>  	depends on ARCH_MXS
> +	select GENERIC_IRQ_CHIP
>  	select GPIO_BASIC_MMIO_CORE
>  
>  config GPIO_PLAT_SAMSUNG
> diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c
> index ddde0f4..d8cafba 100644
> --- a/drivers/gpio/gpio-mxs.c
> +++ b/drivers/gpio/gpio-mxs.c
> @@ -59,51 +59,12 @@ struct mxs_gpio_port {
>  
>  /* Note: This driver assumes 32 GPIOs are handled in one register */
>  
> -static void clear_gpio_irqstatus(struct mxs_gpio_port *port, u32 index)
> -{
> -	writel(1 << index, port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR);
> -}
> -
> -static void set_gpio_irqenable(struct mxs_gpio_port *port, u32 index,
> -				int enable)
> -{
> -	if (enable) {
> -		writel(1 << index,
> -			port->base + PINCTRL_IRQEN(port->id) + MXS_SET);
> -		writel(1 << index,
> -			port->base + PINCTRL_PIN2IRQ(port->id) + MXS_SET);
> -	} else {
> -		writel(1 << index,
> -			port->base + PINCTRL_IRQEN(port->id) + MXS_CLR);
> -	}
> -}
> -
> -static void mxs_gpio_ack_irq(struct irq_data *d)
> -{
> -	struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
> -	u32 gpio = irq_to_gpio(d->irq);
> -	clear_gpio_irqstatus(port, gpio & 0x1f);
> -}
> -
> -static void mxs_gpio_mask_irq(struct irq_data *d)
> -{
> -	struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
> -	u32 gpio = irq_to_gpio(d->irq);
> -	set_gpio_irqenable(port, gpio & 0x1f, 0);
> -}
> -
> -static void mxs_gpio_unmask_irq(struct irq_data *d)
> -{
> -	struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
> -	u32 gpio = irq_to_gpio(d->irq);
> -	set_gpio_irqenable(port, gpio & 0x1f, 1);
> -}
> -
>  static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
>  {
>  	u32 gpio = irq_to_gpio(d->irq);
>  	u32 pin_mask = 1 << (gpio & 31);
> -	struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
> +	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;
>  
> @@ -138,7 +99,8 @@ static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
>  	else
>  		writel(pin_mask, pin_addr + MXS_CLR);
>  
> -	clear_gpio_irqstatus(port, gpio & 0x1f);
> +	writel(1 << (gpio & 0x1f),
> +	       port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR);
>  
>  	return 0;
>  }
> @@ -173,7 +135,8 @@ static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
>   */
>  static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
>  {
> -	struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
> +	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
> +	struct mxs_gpio_port *port = gc->private;
>  
>  	if (enable)
>  		enable_irq_wake(port->irq);
> @@ -183,14 +146,26 @@ static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
>  	return 0;
>  }
>  
> -static struct irq_chip gpio_irq_chip = {
> -	.name = "mxs gpio",
> -	.irq_ack = mxs_gpio_ack_irq,
> -	.irq_mask = mxs_gpio_mask_irq,
> -	.irq_unmask = mxs_gpio_unmask_irq,
> -	.irq_set_type = mxs_gpio_set_irq_type,
> -	.irq_set_wake = mxs_gpio_set_wake_irq,
> -};
> +static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port)
> +{
> +	struct irq_chip_generic *gc;
> +	struct irq_chip_type *ct;
> +
> +	gc = irq_alloc_generic_chip("gpio-mxs", 1, port->virtual_irq_start,
> +				    port->base, handle_level_irq);
> +	gc->private = port;
> +
> +	ct = gc->chip_types;
> +	ct->chip.irq_ack = irq_gc_ack,
> +	ct->chip.irq_mask = irq_gc_mask_clr_bit;
> +	ct->chip.irq_unmask = irq_gc_mask_set_bit;
> +	ct->chip.irq_set_type = mxs_gpio_set_irq_type;
> +	ct->chip.irq_set_wake = mxs_gpio_set_wake_irq,
> +	ct->regs.ack = PINCTRL_IRQSTAT(port->id) + MXS_CLR;
> +	ct->regs.mask = PINCTRL_IRQEN(port->id);
> +
> +	irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
> +}
>  
>  static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
>  {
> @@ -206,7 +181,7 @@ static int __devinit mxs_gpio_probe(struct platform_device *pdev)
>  	static void __iomem *base;
>  	struct mxs_gpio_port *port;
>  	struct resource *iores = NULL;
> -	int err, i;
> +	int err;
>  
>  	port = kzalloc(sizeof(struct mxs_gpio_port), GFP_KERNEL);
>  	if (!port)
> @@ -246,20 +221,18 @@ static int __devinit mxs_gpio_probe(struct platform_device *pdev)
>  		goto out_iounmap;
>  	}
>  
> -	/* disable the interrupt and clear the status */
> -	writel(0, port->base + PINCTRL_PIN2IRQ(port->id));
> +	/*
> +	 * select the pin interrupt functionality but initially
> +	 * disable the interrupts
> +	 */
> +	writel(~0U, port->base + PINCTRL_PIN2IRQ(port->id));
>  	writel(0, port->base + PINCTRL_IRQEN(port->id));
>  
>  	/* clear address has to be used to clear IRQSTAT bits */
>  	writel(~0U, port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR);
>  
> -	for (i = port->virtual_irq_start;
> -		i < port->virtual_irq_start + 32; i++) {
> -		irq_set_chip_and_handler(i, &gpio_irq_chip,
> -					 handle_level_irq);
> -		set_irq_flags(i, IRQF_VALID);
> -		irq_set_chip_data(i, port);
> -	}
> +	/* gpio-mxs can be a generic irq chip */
> +	mxs_gpio_init_gc(port);
>  
>  	/* setup one handler for each entry */
>  	irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
> -- 
> 1.7.4.1
>