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authorMichal Simek <monstr@monstr.eu>2010-01-14 15:16:31 +0100
committerMichal Simek <monstr@monstr.eu>2010-03-11 13:59:28 +0100
commitc6ba01a4c7806d134c8d483525997559071d0990 (patch)
tree07fcff3b237903424d5c7e11497c575d6301e323 /arch/microblaze
parenta84642a339235020e6dccc022de27055f1fa9340 (diff)
microblaze: Add irq_create_{of_,}mapping functions
Support function for PCI. We don't use any advance mapping mechanism that's why implementation is simple. Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
-rw-r--r--arch/microblaze/include/asm/irq.h37
-rw-r--r--arch/microblaze/kernel/irq.c15
2 files changed, 51 insertions, 1 deletions
diff --git a/arch/microblaze/include/asm/irq.h b/arch/microblaze/include/asm/irq.h
index 90f050535eb..31a35c33df6 100644
--- a/arch/microblaze/include/asm/irq.h
+++ b/arch/microblaze/include/asm/irq.h
@@ -14,6 +14,12 @@
#include <linux/interrupt.h>
+/* This type is the placeholder for a hardware interrupt number. It has to
+ * be big enough to enclose whatever representation is used by a given
+ * platform.
+ */
+typedef unsigned long irq_hw_number_t;
+
extern unsigned int nr_irq;
#define NO_IRQ (-1)
@@ -21,7 +27,8 @@ extern unsigned int nr_irq;
struct pt_regs;
extern void do_IRQ(struct pt_regs *regs);
-/* irq_of_parse_and_map - Parse and Map an interrupt into linux virq space
+/**
+ * irq_of_parse_and_map - Parse and Map an interrupt into linux virq space
* @device: Device node of the device whose interrupt is to be mapped
* @index: Index of the interrupt to map
*
@@ -40,4 +47,32 @@ static inline void irq_dispose_mapping(unsigned int virq)
return;
}
+struct irq_host;
+
+/**
+ * irq_create_mapping - Map a hardware interrupt into linux virq space
+ * @host: host owning this hardware interrupt or NULL for default host
+ * @hwirq: hardware irq number in that host space
+ *
+ * Only one mapping per hardware interrupt is permitted. Returns a linux
+ * virq number.
+ * If the sense/trigger is to be specified, set_irq_type() should be called
+ * on the number returned from that call.
+ */
+extern unsigned int irq_create_mapping(struct irq_host *host,
+ irq_hw_number_t hwirq);
+
+/**
+ * irq_create_of_mapping - Map a hardware interrupt into linux virq space
+ * @controller: Device node of the interrupt controller
+ * @inspec: Interrupt specifier from the device-tree
+ * @intsize: Size of the interrupt specifier from the device-tree
+ *
+ * This function is identical to irq_create_mapping except that it takes
+ * as input informations straight from the device-tree (typically the results
+ * of the of_irq_map_*() functions.
+ */
+extern unsigned int irq_create_of_mapping(struct device_node *controller,
+ u32 *intspec, unsigned int intsize);
+
#endif /* _ASM_MICROBLAZE_IRQ_H */
diff --git a/arch/microblaze/kernel/irq.c b/arch/microblaze/kernel/irq.c
index 0f06034d1fe..6f39e2c001f 100644
--- a/arch/microblaze/kernel/irq.c
+++ b/arch/microblaze/kernel/irq.c
@@ -93,3 +93,18 @@ skip:
}
return 0;
}
+
+/* MS: There is no any advance mapping mechanism. We are using simple 32bit
+ intc without any cascades or any connection that's why mapping is 1:1 */
+unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
+{
+ return hwirq;
+}
+EXPORT_SYMBOL_GPL(irq_create_mapping);
+
+unsigned int irq_create_of_mapping(struct device_node *controller,
+ u32 *intspec, unsigned int intsize)
+{
+ return intspec[0];
+}
+EXPORT_SYMBOL_GPL(irq_create_of_mapping);