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65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
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* Dynamic IRQ management
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*
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* Copyright (C) 2010 Paul Mundt
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*
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* Modelled after arch/x86/kernel/apic/io_apic.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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#define pr_fmt(fmt) "intc: " fmt
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#include <linux/irq.h>
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#include <linux/bitmap.h>
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#include <linux/spinlock.h>
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#include "internals.h" /* only for activate_irq() damage.. */
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/*
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* The IRQ bitmap provides a global map of bound IRQ vectors for a
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* given platform. Allocation of IRQs are either static through the CPU
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* vector map, or dynamic in the case of board mux vectors or MSI.
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*
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* As this is a central point for all IRQ controllers on the system,
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* each of the available sources are mapped out here. This combined with
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* sparseirq makes it quite trivial to keep the vector map tightly packed
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* when dynamically creating IRQs, as well as tying in to otherwise
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* unused irq_desc positions in the sparse array.
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*/
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/*
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* Dynamic IRQ allocation and deallocation
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*/
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unsigned int create_irq_nr(unsigned int irq_want, int node)
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{
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int irq = irq_alloc_desc_at(irq_want, node);
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if (irq < 0)
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return 0;
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activate_irq(irq);
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return irq;
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}
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int create_irq(void)
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{
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int irq = irq_alloc_desc(numa_node_id());
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if (irq >= 0)
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activate_irq(irq);
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return irq;
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}
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void destroy_irq(unsigned int irq)
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{
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irq_free_desc(irq);
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}
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void reserve_intc_vectors(struct intc_vect *vectors, unsigned int nr_vecs)
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{
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int i;
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for (i = 0; i < nr_vecs; i++)
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irq_reserve_irq(evt2irq(vectors[i].vect));
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}
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