Re: [patch 8/8] irqchip: sun4i: Convert to generic irq chip

[Rob Herring <robherring2@gmail.com>]

On 05/06/2013 09:30 AM, Thomas Gleixner wrote:
> Proof of concept patch to demonstrate the new irqdomain support for
> the generic irq chip. Untested !!
> 
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
> ---
>  drivers/irqchip/irq-sun4i.c |  100 ++++++++++++--------------------------------
>  1 file changed, 29 insertions(+), 71 deletions(-)
> 
> Index: linux-2.6/drivers/irqchip/irq-sun4i.c
> ===================================================================
> --- linux-2.6.orig/drivers/irqchip/irq-sun4i.c
> +++ linux-2.6/drivers/irqchip/irq-sun4i.c
> @@ -32,70 +32,43 @@
>  #define SUN4I_IRQ_FIQ_PENDING_REG(x)	(0x20 + 0x4 * x)
>  #define SUN4I_IRQ_ENABLE_REG(x)		(0x40 + 0x4 * x)
>  #define SUN4I_IRQ_MASK_REG(x)		(0x50 + 0x4 * x)
> +#define SUN4I_NUM_CHIPS			3
> +#define SUN4I_IRQS_PER_CHIP		32
>  
>  static void __iomem *sun4i_irq_base;
>  static struct irq_domain *sun4i_irq_domain;
>  
>  static asmlinkage void __exception_irq_entry sun4i_handle_irq(struct pt_regs *regs);
>  
> -void sun4i_irq_ack(struct irq_data *irqd)
> +static int __init sun4i_init_domain_chips(void)
>  {
> -	unsigned int irq = irqd_to_hwirq(irqd);
> -	unsigned int irq_off = irq % 32;
> -	int reg = irq / 32;
> -	u32 val;
> -
> -	val = readl(sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg));
> -	writel(val | (1 << irq_off),
> -	       sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg));
> -}
> -
> -static void sun4i_irq_mask(struct irq_data *irqd)
> -{
> -	unsigned int irq = irqd_to_hwirq(irqd);
> -	unsigned int irq_off = irq % 32;
> -	int reg = irq / 32;
> -	u32 val;
> -
> -	val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
> -	writel(val & ~(1 << irq_off),
> -	       sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
> -}
> -
> -static void sun4i_irq_unmask(struct irq_data *irqd)
> -{
> -	unsigned int irq = irqd_to_hwirq(irqd);
> -	unsigned int irq_off = irq % 32;
> -	int reg = irq / 32;
> -	u32 val;
> -
> -	val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
> -	writel(val | (1 << irq_off),
> -	       sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
> -}
> -
> -static struct irq_chip sun4i_irq_chip = {
> -	.name		= "sun4i_irq",
> -	.irq_ack	= sun4i_irq_ack,
> -	.irq_mask	= sun4i_irq_mask,
> -	.irq_unmask	= sun4i_irq_unmask,
> -};
> -
> -static int sun4i_irq_map(struct irq_domain *d, unsigned int virq,
> -			 irq_hw_number_t hw)
> -{
> -	irq_set_chip_and_handler(virq, &sun4i_irq_chip,
> -				 handle_level_irq);
> -	set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
> -
> +	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
> +	struct irq_chip_generic *gc;
> +	int i, ret, base = 0;
> +
> +	ret = irq_alloc_domain_generic_chips(d, SUN4I_IRQS_PER_CHIP, 1,

1 should be SUN4I_NUM_CHIPS.

> +					     "sun4i_irq", handle_level_irq,
> +					     clr, 0, IRQ_GC_INIT_MASK_CACHE);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < SUN4I_NUM_CHIPS; i++, base += SUN4I_IRQS_PER_CHIP) {
> +		gc = irq_get_domain_generic_chip(sun4i_irq_domain, base);

Perhaps this could be an iterator macro.

> +		gc->reg_base = sun4i_irq_base;
> +		gc->chip_types[0].regs.mask = SUN4I_IRQ_ENABLE_REG(i);
> +		gc->chip_types[0].regs.ack = SUN4I_IRQ_PENDING_REG(i);
> +		gc->chip_types[0].chip.mask = irq_gc_mask_clr_bit;
> +		gc->chip_types[0].chip.ack = irq_gc_ack_set_bit;
> +		gc->chip_types[0].chip.unmask = irq_gc_mask_set_bit;
> +
> +		/* Disable, mask and clear all pending interrupts */
> +		writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(i));
> +		writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(i));
> +		writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(i));
> +	}
>  	return 0;
>  }
>  
> -static struct irq_domain_ops sun4i_irq_ops = {
> -	.map = sun4i_irq_map,
> -	.xlate = irq_domain_xlate_onecell,
> -};
> -
>  static int __init sun4i_of_init(struct device_node *node,
>  				struct device_node *parent)
>  {
> @@ -104,21 +77,6 @@ static int __init sun4i_of_init(struct d
>  		panic("%s: unable to map IC registers\n",
>  			node->full_name);
>  
> -	/* Disable all interrupts */
> -	writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(0));
> -	writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(1));
> -	writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(2));
> -
> -	/* Mask all the interrupts */
> -	writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(0));
> -	writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(1));
> -	writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(2));
> -
> -	/* Clear all the pending interrupts */
> -	writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(0));
> -	writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(1));
> -	writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(2));
> -
>  	/* Enable protection mode */
>  	writel(0x01, sun4i_irq_base + SUN4I_IRQ_PROTECTION_REG);
>  
> @@ -126,8 +84,8 @@ static int __init sun4i_of_init(struct d
>  	writel(0x00, sun4i_irq_base + SUN4I_IRQ_NMI_CTRL_REG);
>  
>  	sun4i_irq_domain = irq_domain_add_linear(node, 3 * 32,

s/3 * 32/SUN4I_NUM_CHIPS * SUN4I_IRQS_PER_CHIP/

> -						 &sun4i_irq_ops, NULL);
> -	if (!sun4i_irq_domain)
> +						 &irq_generic_chip_ops, NULL);
> +	if (!sun4i_irq_domain || sun4i_init_domain_chips())
>  		panic("%s: unable to create IRQ domain\n", node->full_name);
>  
>  	set_handle_irq(sun4i_handle_irq);
> 
> 
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