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2be6bb0c PM |
1 | /* |
2 | * Dynamic IRQ management | |
3 | * | |
4 | * Copyright (C) 2010 Paul Mundt | |
5 | * | |
6 | * Modelled after arch/x86/kernel/apic/io_apic.c | |
7 | * | |
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. | |
11 | */ | |
12 | #define pr_fmt(fmt) "intc: " fmt | |
13 | ||
14 | #include <linux/irq.h> | |
15 | #include <linux/bitmap.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include "internals.h" /* only for activate_irq() damage.. */ | |
18 | ||
19 | /* | |
38ab1344 | 20 | * The IRQ bitmap provides a global map of bound IRQ vectors for a |
2be6bb0c PM |
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. | |
23 | * | |
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. | |
29 | */ | |
2be6bb0c PM |
30 | |
31 | /* | |
32 | * Dynamic IRQ allocation and deallocation | |
33 | */ | |
34 | unsigned int create_irq_nr(unsigned int irq_want, int node) | |
35 | { | |
38ab1344 PM |
36 | int irq = irq_alloc_desc_at(irq_want, node); |
37 | if (irq < 0) | |
c4318baf | 38 | return 0; |
2be6bb0c | 39 | |
c4318baf | 40 | activate_irq(irq); |
38ab1344 | 41 | return irq; |
2be6bb0c PM |
42 | } |
43 | ||
44 | int create_irq(void) | |
45 | { | |
38ab1344 PM |
46 | int irq = irq_alloc_desc(numa_node_id()); |
47 | if (irq >= 0) | |
48 | activate_irq(irq); | |
2be6bb0c PM |
49 | |
50 | return irq; | |
51 | } | |
52 | ||
53 | void destroy_irq(unsigned int irq) | |
54 | { | |
c4318baf | 55 | irq_free_desc(irq); |
2be6bb0c PM |
56 | } |
57 | ||
58 | void reserve_intc_vectors(struct intc_vect *vectors, unsigned int nr_vecs) | |
59 | { | |
2be6bb0c PM |
60 | int i; |
61 | ||
2be6bb0c | 62 | for (i = 0; i < nr_vecs; i++) |
20f95e0b | 63 | irq_reserve_irq(evt2irq(vectors[i].vect)); |
2be6bb0c | 64 | } |