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

[Hanjun Guo]

From: Amit Daniel Kachhap <amit.daniel at 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 at samsung.com>
Signed-off-by: Hanjun Guo <hanjun.guo at 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