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Commit c6ba01a4 authored by Michal Simek's avatar Michal Simek
Browse files

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: default avatarMichal Simek <monstr@monstr.eu>
parent a84642a3

arch/microblaze/include/asm/irq.h

+36 −1
Original line number Diff line number Diff line
@@ -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 */

arch/microblaze/kernel/irq.c

+15 −0
Original line number Diff line number Diff line
@@ -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);