Subject: [PATCH v4 2/4] irq: add irq_domain support to generic-chip

From: [email-masked] (Rob Herring)
Date: Wed, 08 Feb 2012 10:49:26 -0600

On 02/08/2012 01:15 AM, Shawn Guo wrote:
> On Mon, Feb 06, 2012 at 10:54:56PM -0600, Rob Herring wrote:
> ...
>> I've pushed a v5 branch. Can you please test it out on mx51.
>>
> Unfortunately, it still does not work.  The following are the changes
> I made to get it work for both non-dt and dt boot.
> 
> Since you do not have hardware to test, I would suggest you leave the
> tzic changes to me.  I would post a series to migrate tzic and gpio-mxc
> shortly after your series becomes stable, and you can fold it into your
> series if it looks good to you then.

Certainly fine by me. My plan is to send this to Grant.

> BTW, the arch/arm/mach-mx5 folder has been merged into mach-imx since
> 3.3-rc2.  The following changes are based on a merging of your branch
> into 3.3-rc2.
> 
> ---8<-----
> diff --git a/arch/arm/boot/dts/imx51.dtsi b/arch/arm/boot/dts/imx51.dtsi
> index 6663986..a5fda43 100644
> --- a/arch/arm/boot/dts/imx51.dtsi
> +++ b/arch/arm/boot/dts/imx51.dtsi
> @@ -171,6 +171,12 @@
>  				status = "disabled";
>  			};
>  
> +			gpt at 73fa0000 {
> +				compatible = "fsl,imx51-gpt", "fsl,gpt";
> +				reg = <0x73fa0000 0x4000>;
> +				interrupts = <39>;
> +			};
> +
>  			uart1: uart at 73fbc000 {
>  				compatible = "fsl,imx51-uart", "fsl,imx21-uart";
>  				reg = <0x73fbc000 0x4000>;
> diff --git a/arch/arm/mach-imx/clock-mx51-mx53.c b/arch/arm/mach-imx/clock-mx51-mx53.c
> index 0847050..4f2dc66 100644
> --- a/arch/arm/mach-imx/clock-mx51-mx53.c
> +++ b/arch/arm/mach-imx/clock-mx51-mx53.c
> @@ -16,6 +16,7 @@
>  #include <linux/io.h>
>  #include <linux/clkdev.h>
>  #include <linux/of.h>
> +#include <linux/of_irq.h>
>  
>  #include <asm/div64.h>
>  
> @@ -1555,10 +1556,12 @@ static void clk_tree_init(void)
>  	__raw_writel(reg, MXC_CCM_CBCDR);
>  }
>  
> +static int get_timer_irq(void);
> +
>  int __init mx51_clocks_init(unsigned long ckil, unsigned long osc,
>  			unsigned long ckih1, unsigned long ckih2)
>  {
> -	int i;
> +	int i, gpt_irq;
>  
>  	external_low_reference = ckil;
>  	external_high_reference = ckih1;
> @@ -1592,6 +1595,9 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc,
>  	clk_set_rate(&esdhc2_clk, 166250000);
>  
>  	/* System timer */
> +	gpt_irq = get_timer_irq();
> +	if (!gpt_irq)
> +		gpt_irq = MX51_INT_GPT;
>  	mxc_timer_init(&gpt_clk, MX51_IO_ADDRESS(MX51_GPT1_BASE_ADDR),
>  		MX51_INT_GPT);
>  	return 0;
> @@ -1600,7 +1606,7 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc,
>  int __init mx53_clocks_init(unsigned long ckil, unsigned long osc,
>  			unsigned long ckih1, unsigned long ckih2)
>  {
> -	int i;
> +	int i, gpt_irq;
>  
>  	external_low_reference = ckil;
>  	external_high_reference = ckih1;
> @@ -1629,8 +1635,11 @@ int __init mx53_clocks_init(unsigned long ckil, unsigned long osc,
>  	clk_set_rate(&esdhc3_mx53_clk, 200000000);
>  
>  	/* System timer */
> +	gpt_irq = get_timer_irq();
> +	if (!gpt_irq)
> +		gpt_irq = MX53_INT_GPT;
>  	mxc_timer_init(&gpt_clk, MX53_IO_ADDRESS(MX53_GPT1_BASE_ADDR),
> -		MX53_INT_GPT);
> +		gpt_irq);
>  	return 0;
>  }
>  
> @@ -1672,4 +1681,15 @@ int __init mx53_clocks_init_dt(void)
>  	clk_get_freq_dt(&ckil, &osc, &ckih1, &ckih2);
>  	return mx53_clocks_init(ckil, osc, ckih1, ckih2);
>  }
> +
> +static inline int get_timer_irq(void)
> +{
> +	return irq_of_parse_and_map(
> +			of_find_compatible_node(NULL, NULL, "fsl,gpt"), 0);
> +}
> +#else
> +static inline int get_timer_irq(void)
> +{
> +	return 0;
> +}
>  #endif
> diff --git a/arch/arm/mach-imx/imx51-dt.c b/arch/arm/mach-imx/imx51-dt.c
> index cc4bb16..98eb415 100644
> --- a/arch/arm/mach-imx/imx51-dt.c
> +++ b/arch/arm/mach-imx/imx51-dt.c
> @@ -12,6 +12,7 @@
>  
>  #include <linux/irq.h>
>  #include <linux/irqdomain.h>
> +#include <linux/of_address.h>
>  #include <linux/of_irq.h>
>  #include <linux/of_platform.h>
>  #include <asm/mach/arch.h>
> diff --git a/arch/arm/plat-mxc/tzic.c b/arch/arm/plat-mxc/tzic.c
> index 1962188..def0090 100644
> --- a/arch/arm/plat-mxc/tzic.c
> +++ b/arch/arm/plat-mxc/tzic.c
> @@ -167,7 +167,9 @@ void __init tzic_init_irq(void __iomem *irqbase)
>  
>  	/* all IRQ no FIQ Warning :: No selection */
>  
> -	irq_setup_generic_chip_domain("tzic", NULL, 1, 0, tzic_base,
> +	irq_setup_generic_chip_domain("tzic",
> +				      of_find_compatible_node(NULL, NULL, "fsl,tzic"),
> +				      1, 0, tzic_base,
>  				      handle_level_irq, TZIC_NUM_IRQS, 0,
>  				      IRQ_NOREQUEST, 0,
>  				      tzic_init_gc, &tzic_extra_irq);
> diff --git a/include/linux/of.h b/include/linux/of.h
> index a75a831..92cf6ad 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -281,6 +281,14 @@ static inline struct property *of_find_property(const struct device_node *np,
>  	return NULL;
>  }
>  
> +static inline struct device_node *of_find_compatible_node(
> +						struct device_node *from,
> +						const char *type,
> +						const char *compat)
> +{
> +	return NULL;
> +}
> +
>  static inline int of_property_read_u32_array(const struct device_node *np,
>  					     const char *propname,
>  					     u32 *out_values, size_t sz)
> diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
> index fed1cf7..c9e7a58 100644
> --- a/kernel/irq/generic-chip.c
> +++ b/kernel/irq/generic-chip.c
> @@ -291,7 +291,7 @@ static int irq_gc_irq_domain_map(struct irq_domain *d, unsigned int irq,
>  
>  static const struct irq_domain_ops irq_gc_irq_domain_ops = {
>  	.map = irq_gc_irq_domain_map,
> -	.xlate = irq_domain_xlate_twocell,
> +	.xlate = irq_domain_xlate_onetwocell,
>  };
>  
>  /*
> @@ -344,13 +344,6 @@ int irq_setup_generic_chip_domain(const char *name, struct device_node *node,
>  		gc_init_cb(gc[i]);
>  
>  		irq_setup_generic_chip(gc[i], 0, flags, clr, set);
> -		if (node)
> -			continue;
> -
> -		/* Additional setup for legacy domains */
> -		for (hwirq = 0; hwirq < 32; irq_base++, hwirq++)
> -			irq_get_irq_data(irq_base)->hwirq =
> -				gc[i]->hwirq_base + hwirq;
>  	}
>  
>  	if (node)
> ---->8----
> 
>> Grant, is there some reason a legacy domain cannot setup the
>> irq_data.hwirq itself? No other code should be setting this up.
>>
> I'm not sure this is true, since it works for my non-dt case with your
> 'Addtional setup ...' code above removed.

Ahh, right.

Rob