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microblaze: Add irq_create_{of_,}mapping functions

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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>
This commit is contained in:
Michal Simek 2010-01-14 15:16:31 +01:00
parent a84642a339
commit c6ba01a4c7
2 changed files with 51 additions and 1 deletions
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37
arch/microblaze/include/asm/irq.h
View File

@ -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 */

15
arch/microblaze/kernel/irq.c
View File

@ -93,3 +93,18 @@ int show_interrupts(struct seq_file *p, void *v)
}
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);