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Message-ID: <4F1F5FE0.9090901@gmail.com>
Date: Tue, 24 Jan 2012 19:50:24 -0600
From: Rob Herring <robherring2@...il.com>
To: Grant Likely <grant.likely@...retlab.ca>
CC: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [RFC 1/2] irq_domain: Create common xlate functions that device
drivers can use
On 01/24/2012 06:18 PM, Grant Likely wrote:
> Rather than having each interrupt controller driver creating its own barely
> unique .xlate function for irq_domain, create a library of translators which
> any driver can use directly.
>
> Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> ---
>
> This builds on top of my irq_domain series and will be included with it when
> I post v3. Rob, does this serve your needs for generic irq controller DT
> support?
>
Yes, but comments below.
> g.
>
> include/linux/irqdomain.h | 15 ++++++++++
> kernel/irq/irqdomain.c | 69 +++++++++++++++++++++++++++++++++++++++-----
> 2 files changed, 76 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
> index e7379a3..5e497a0 100644
> --- a/include/linux/irqdomain.h
> +++ b/include/linux/irqdomain.h
> @@ -110,6 +110,9 @@ struct irq_domain {
> void *host_data;
> irq_hw_number_t inval_irq;
>
> + /* Data for common irq xlate functions */
> + unsigned int xlate_type;
> +
How does this get set? Do we want interrupt controllers messing with the
domain struct directly long term?
> /* Optional device node pointer */
> struct device_node *of_node;
> };
> @@ -163,6 +166,18 @@ extern unsigned int irq_linear_revmap(struct irq_domain *host,
> irq_hw_number_t hwirq);
>
> extern struct irq_domain_ops irq_domain_simple_ops;
> +
> +/* stock xlate functions */
> +int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
> + const u32 *intspec, unsigned int intsize,
> + irq_hw_number_t *out_hwirq, unsigned int *out_type);
> +int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
> + const u32 *intspec, unsigned int intsize,
> + irq_hw_number_t *out_hwirq, unsigned int *out_type);
> +int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
> + const u32 *intspec, unsigned int intsize,
> + irq_hw_number_t *out_hwirq, unsigned int *out_type);
> +
> #if defined(CONFIG_OF_IRQ)
> extern void irq_domain_generate_simple(const struct of_device_id *match,
> u64 phys_base, unsigned int irq_start);
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index def8e7b..df80205 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -53,6 +53,7 @@ static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
> domain->ops = ops;
> domain->host_data = host_data;
> domain->of_node = of_node_get(of_node);
> + domain->xlate_type = IRQ_TYPE_NONE;
>
> if (domain->ops->match == NULL)
> domain->ops->match = default_irq_domain_match;
> @@ -690,25 +691,77 @@ int irq_domain_simple_map(struct irq_domain *d, unsigned int irq,
> return 0;
> }
>
> -int irq_domain_simple_xlate(struct irq_domain *d,
> - struct device_node *controller,
> - const u32 *intspec, unsigned int intsize,
> - unsigned long *out_hwirq, unsigned int *out_type)
> +/**
> + * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
> + *
> + * Device Tree IRQ specifier translation function which works with one cell
> + * bindings where the cell value maps directly to the hwirq number.
> + */
> +int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
> + const u32 *intspec, unsigned int intsize,
> + unsigned long *out_hwirq, unsigned int *out_type)
> +{
> + if (WARN(intsize < 1, "Bad intspec for %s: intsize=%i < 1\n",
> + ctrlr->full_name, intsize))
> + return -EINVAL;
> + *out_hwirq = intspec[0];
> + *out_type = d->xlate_type;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
> +
> +/**
> + * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
> + *
> + * Device Tree IRQ specifier translation function which works with two cell
> + * bindings where the cell values map directly to the hwirq number
> + * and linux irq flags.
> + */
> +int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
> + const u32 *intspec, unsigned int intsize,
> + irq_hw_number_t *out_hwirq, unsigned int *out_type)
> {
> - if (d->of_node != controller)
> + if (WARN(intsize < 2, "Bad intspec for %s: intsize=%i < 2\n",
> + ctrlr->full_name, intsize))
> + return -EINVAL;
> + if (intsize < 2)
You've already checked this...
> return -EINVAL;
> - if (intsize < 1)
> + *out_hwirq = intspec[0];
> + *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
> +
> +/**
> + * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
> + *
> + * Device Tree IRQ specifier translation function which works with either one
> + * or two cell bindings where the cell values map directly to the hwirq number
> + * and linux irq flags.
> + *
> + * Note: don't use this function unless your interrupt controller explicitly
> + * supports both one and two cell bindings. For the majority of controllers
> + * the _onecell() or _twocell() variants above should be used.
This comment is confusing since you turn around and use it for simple
ops below.
> + */
> +int irq_domain_xlate_onetwocell(struct irq_domain *d,
> + struct device_node *ctrlr,
> + const u32 *intspec, unsigned int intsize,
> + unsigned long *out_hwirq, unsigned int *out_type)
> +{
> + if (WARN(intsize < 1, "Bad intspec for %s: intsize=%i < 1\n",
> + ctrlr->full_name, intsize))
> return -EINVAL;
Isn't this check redundant with the check in of_irq_map_raw:
if (ointsize != intsize)
return -EINVAL;
The only diff in these functions is really checking the size. So I
really don't think we need 3 versions if that can be factored out where
you know value of #interrupt-cells.
Rob
> *out_hwirq = intspec[0];
> - *out_type = IRQ_TYPE_NONE;
> + *out_type = d->xlate_type;
> if (intsize > 1)
> *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
> return 0;
> }
> +EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
>
> struct irq_domain_ops irq_domain_simple_ops = {
> .map = irq_domain_simple_map,
> - .xlate = irq_domain_simple_xlate,
> + .xlate = irq_domain_xlate_onetwocell,
> };
> EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
>
--
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