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irqdomain: Introduce a firmware-specific IRQ specifier structure 

So far the closest thing to a generic IRQ specifier structure is
of_phandle_args, which happens to be pretty OF specific (the of_node
pointer in there is quite annoying).

Let's introduce 'struct irq_fwspec' that can be used in place of
of_phandle_args for OF, but also for other firmware implementations
(that'd be ACPI). This is used together with a new 'translate' method
that is the pendent of 'xlate'.

We convert irq_create_of_mapping to use this new structure (with a
small hack that will be removed later).

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-and-tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Tomasz Nowicki <tomasz.nowicki@linaro.org>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: Graeme Gregory <graeme@xora.org.uk>
Cc: Jake Oshins <jakeo@microsoft.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Link: http://lkml.kernel.org/r/1444737105-31573-5-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Marc Zyngier 2015-10-13 12:51:32 +01:00 committed by Thomas Gleixner
parent 130b8c6c8d
commit 11e4438ee3
2 changed files with 68 additions and 11 deletions
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20
include/linux/irqdomain.h
View File

@ -46,6 +46,24 @@ struct irq_data;
/* Number of irqs reserved for a legacy isa controller */
#define NUM_ISA_INTERRUPTS 16
#define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16
/**
* struct irq_fwspec - generic IRQ specifier structure
*
* @fwnode: Pointer to a firmware-specific descriptor
* @param_count: Number of device-specific parameters
* @param: Device-specific parameters
*
* This structure, directly modeled after of_phandle_args, is used to
* pass a device-specific description of an interrupt.
*/
struct irq_fwspec {
struct fwnode_handle *fwnode;
int param_count;
u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
};
/*
* Should several domains have the same device node, but serve
* different purposes (for example one domain is for PCI/MSI, and the
@ -92,6 +110,8 @@ struct irq_domain_ops {
unsigned int nr_irqs);
void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec,
unsigned long *out_hwirq, unsigned int *out_type);
#endif
};

59
kernel/irq/irqdomain.c
View File

@ -484,30 +484,67 @@ int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
}
EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
static int irq_domain_translate(struct irq_domain *d,
struct irq_fwspec *fwspec,
irq_hw_number_t *hwirq, unsigned int *type)
{
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
if (d->ops->translate)
return d->ops->translate(d, fwspec, hwirq, type);
#endif
if (d->ops->xlate)
return d->ops->xlate(d, to_of_node(fwspec->fwnode),
fwspec->param, fwspec->param_count,
hwirq, type);
/* If domain has no translation, then we assume interrupt line */
*hwirq = fwspec->param[0];
return 0;
}
static void of_phandle_args_to_fwspec(struct of_phandle_args *irq_data,
struct irq_fwspec *fwspec)
{
int i;
fwspec->fwnode = irq_data->np ? &irq_data->np->fwnode : NULL;
fwspec->param_count = irq_data->args_count;
for (i = 0; i < irq_data->args_count; i++)
fwspec->param[i] = irq_data->args[i];
}
unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
{
struct irq_fwspec fwspec;
struct irq_domain *domain;
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
int virq;
domain = irq_data->np ? irq_find_host(irq_data->np) : irq_default_domain;
of_phandle_args_to_fwspec(irq_data, &fwspec);
if (fwspec.fwnode)
domain = irq_find_matching_fwnode(fwspec.fwnode, DOMAIN_BUS_ANY);
else
domain = irq_default_domain;
if (!domain) {
pr_warn("no irq domain found for %s !\n",
of_node_full_name(irq_data->np));
of_node_full_name(to_of_node(fwspec.fwnode)));
return 0;
}
/* If domain has no translation, then we assume interrupt line */
if (domain->ops->xlate == NULL)
hwirq = irq_data->args[0];
else {
if (domain->ops->xlate(domain, irq_data->np, irq_data->args,
irq_data->args_count, &hwirq, &type))
return 0;
}
if (irq_domain_translate(domain, &fwspec, &hwirq, &type))
return 0;
if (irq_domain_is_hierarchy(domain)) {
/* Temporary hack */
void *desc = &fwspec;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
if (!domain->ops->translate)
desc = irq_data;
#endif
/*
* If we've already configured this interrupt,
* don't do it again, or hell will break loose.
@ -516,7 +553,7 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
if (virq)
return virq;
virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, irq_data);
virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, desc);
if (virq <= 0)
return 0;
} else {