Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / sh / intc / dynamic.c
bloba3677c9dfe36e3fa6ebcac37bee81af58d9ece5c
1 /*
2 * Dynamic IRQ management
4 * Copyright (C) 2010 Paul Mundt
6 * Modelled after arch/x86/kernel/apic/io_apic.c
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
12 #define pr_fmt(fmt) "intc: " fmt
14 #include <linux/irq.h>
15 #include <linux/bitmap.h>
16 #include <linux/spinlock.h>
17 #include "internals.h" /* only for activate_irq() damage.. */
20 * The IRQ bitmap provides a global map of bound IRQ vectors for a
21 * given platform. Allocation of IRQs are either static through the CPU
22 * vector map, or dynamic in the case of board mux vectors or MSI.
24 * As this is a central point for all IRQ controllers on the system,
25 * each of the available sources are mapped out here. This combined with
26 * sparseirq makes it quite trivial to keep the vector map tightly packed
27 * when dynamically creating IRQs, as well as tying in to otherwise
28 * unused irq_desc positions in the sparse array.
32 * Dynamic IRQ allocation and deallocation
34 unsigned int create_irq_nr(unsigned int irq_want, int node)
36 int irq = irq_alloc_desc_at(irq_want, node);
37 if (irq < 0)
38 return 0;
40 activate_irq(irq);
41 return irq;
44 int create_irq(void)
46 int irq = irq_alloc_desc(numa_node_id());
47 if (irq >= 0)
48 activate_irq(irq);
50 return irq;
53 void destroy_irq(unsigned int irq)
55 irq_free_desc(irq);
58 void reserve_intc_vectors(struct intc_vect *vectors, unsigned int nr_vecs)
60 int i;
62 for (i = 0; i < nr_vecs; i++)
63 irq_reserve_irq(evt2irq(vectors[i].vect));