6c7a2676f5
As has been discussed many times[1], Using NO_IRQ set to anything other than 0 is bug waiting to happen since many drivers follow the pattern "if (!irq)" for testing whether or not an irq has been set. This patch changes the Microblaze NO_IRQ setting from -1 to 0 to bring it in line with most of the rest of the kernel. It also prepares for Microblaze eventually supporting multiple interrupt controllers by breaking the assumption that hwirq# == Linux IRQ#. The Linux IRQ number is just a cookie with no guarantee of a direct relationship with the hardware irq arrangement. At this point, Microblaze interrupt handling only supports only one instance of one kind of interrupt controller (xilinx_intc). This change shouldn't affect any architecture code outside of the interrupt controller driver and the irq_of mapping. Updated to 3.2 and to use irq_data.hwirq by Rob Herring. Tested and fixed by Michal Simek. [1] http://lkml.org/lkml/2005/11/21/221 Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_IRQ_H
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#define _ASM_MICROBLAZE_IRQ_H
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/*
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* Linux IRQ# is currently offset by one to map to the hardware
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* irq number. So hardware IRQ0 maps to Linux irq 1.
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*/
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#define NO_IRQ_OFFSET 1
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#define IRQ_OFFSET NO_IRQ_OFFSET
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#define NR_IRQS (32 + IRQ_OFFSET)
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#include <asm-generic/irq.h>
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/* This type is the placeholder for a hardware interrupt number. It has to
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* be big enough to enclose whatever representation is used by a given
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* platform.
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*/
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typedef unsigned long irq_hw_number_t;
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extern unsigned int nr_irq;
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#define NO_IRQ 0
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struct pt_regs;
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extern void do_IRQ(struct pt_regs *regs);
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/** FIXME - not implement
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* irq_dispose_mapping - Unmap an interrupt
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* @virq: linux virq number of the interrupt to unmap
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*/
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static inline void irq_dispose_mapping(unsigned int virq)
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{
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return;
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}
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struct irq_host;
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/**
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* irq_create_mapping - Map a hardware interrupt into linux virq space
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* @host: host owning this hardware interrupt or NULL for default host
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* @hwirq: hardware irq number in that host space
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*
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* Only one mapping per hardware interrupt is permitted. Returns a linux
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* virq number.
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* If the sense/trigger is to be specified, set_irq_type() should be called
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* on the number returned from that call.
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*/
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extern unsigned int irq_create_mapping(struct irq_host *host,
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irq_hw_number_t hwirq);
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#endif /* _ASM_MICROBLAZE_IRQ_H */
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