80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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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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* SGI UV IRQ functions
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*
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* Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
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*/
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#include <linux/module.h>
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#include <linux/irq.h>
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#include <asm/apic.h>
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#include <asm/uv/uv_irq.h>
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static void uv_noop(unsigned int irq)
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{
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}
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static unsigned int uv_noop_ret(unsigned int irq)
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{
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return 0;
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}
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static void uv_ack_apic(unsigned int irq)
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{
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ack_APIC_irq();
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}
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struct irq_chip uv_irq_chip = {
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.name = "UV-CORE",
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.startup = uv_noop_ret,
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.shutdown = uv_noop,
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.enable = uv_noop,
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.disable = uv_noop,
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.ack = uv_noop,
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.mask = uv_noop,
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.unmask = uv_noop,
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.eoi = uv_ack_apic,
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.end = uv_noop,
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};
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/*
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* Set up a mapping of an available irq and vector, and enable the specified
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* MMR that defines the MSI that is to be sent to the specified CPU when an
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* interrupt is raised.
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*/
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int uv_setup_irq(char *irq_name, int cpu, int mmr_blade,
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unsigned long mmr_offset)
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{
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int irq;
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int ret;
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irq = create_irq();
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if (irq <= 0)
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return -EBUSY;
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ret = arch_enable_uv_irq(irq_name, irq, cpu, mmr_blade, mmr_offset);
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if (ret != irq)
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destroy_irq(irq);
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return ret;
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}
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EXPORT_SYMBOL_GPL(uv_setup_irq);
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/*
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* Tear down a mapping of an irq and vector, and disable the specified MMR that
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* defined the MSI that was to be sent to the specified CPU when an interrupt
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* was raised.
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*
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* Set mmr_blade and mmr_offset to what was passed in on uv_setup_irq().
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*/
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void uv_teardown_irq(unsigned int irq, int mmr_blade, unsigned long mmr_offset)
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{
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arch_disable_uv_irq(mmr_blade, mmr_offset);
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destroy_irq(irq);
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}
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EXPORT_SYMBOL_GPL(uv_teardown_irq);
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