[RFC part2 PATCH 7/9] irqdomain: Add a new API irq_create_acpi_mapping()

Hanjun Guo
2013-12-03T16:41:05Z

From: Amit Daniel Kachhap <amit.daniel@samsung.com>

This patch introduces a new API for acpi based irq mapping.

[hanjun: Rework this patch to delete the reference to
gic_irq_domain_xlate() which can simplify the code a lot.]

Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
include/linux/acpi.h | 2 ++
kernel/irq/irqdomain.c | 27 +++++++++++++++++++++++++++
2 files changed, 29 insertions(+)

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 1e6a0ac..edd5806 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -141,6 +141,8 @@ int acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu);
int acpi_unmap_lsapic(int cpu);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */

+unsigned int irq_create_acpi_mapping(irq_hw_number_t hwirq,
+ unsigned int type);
int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);
int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base);
void acpi_irq_stats_init(void);
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index cf68bb3..c661552 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -501,6 +501,33 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);

+#ifdef CONFIG_ACPI
+unsigned int irq_create_acpi_mapping(irq_hw_number_t hwirq,
+ unsigned int type)
+{
+ struct irq_domain *domain;
+ unsigned int virq;
+
+ domain = irq_default_domain;
+ if (!domain) {
+ pr_warn("no irq domain found !\n");
+ return 0;
+ }
+
+ /* Create mapping */
+ virq = irq_create_mapping(domain, hwirq);
+ if (!virq)
+ return virq;
+
+ /* Set type if specified and different than the current one */
+ if (type != IRQ_TYPE_NONE &&
+ type != irq_get_trigger_type(virq))
+ irq_set_irq_type(virq, type);
+ return virq;
+}
+EXPORT_SYMBOL_GPL(irq_create_acpi_mapping);
+#endif
+
/**
* irq_dispose_mapping() - Unmap an interrupt
* @virq: linux irq number of the interrupt to unmap
--
1.7.9.5