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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> | |
db4e8395 | 17 | #include <linux/module.h> |
2be6bb0c PM |
18 | #include "internals.h" /* only for activate_irq() damage.. */ |
19 | ||
20 | /* | |
38ab1344 | 21 | * The IRQ bitmap provides a global map of bound IRQ vectors for a |
2be6bb0c PM |
22 | * given platform. Allocation of IRQs are either static through the CPU |
23 | * vector map, or dynamic in the case of board mux vectors or MSI. | |
24 | * | |
25 | * As this is a central point for all IRQ controllers on the system, | |
26 | * each of the available sources are mapped out here. This combined with | |
27 | * sparseirq makes it quite trivial to keep the vector map tightly packed | |
28 | * when dynamically creating IRQs, as well as tying in to otherwise | |
29 | * unused irq_desc positions in the sparse array. | |
30 | */ | |
2be6bb0c PM |
31 | |
32 | /* | |
33 | * Dynamic IRQ allocation and deallocation | |
34 | */ | |
35 | unsigned int create_irq_nr(unsigned int irq_want, int node) | |
36 | { | |
38ab1344 PM |
37 | int irq = irq_alloc_desc_at(irq_want, node); |
38 | if (irq < 0) | |
c4318baf | 39 | return 0; |
2be6bb0c | 40 | |
c4318baf | 41 | activate_irq(irq); |
38ab1344 | 42 | return irq; |
2be6bb0c PM |
43 | } |
44 | ||
45 | int create_irq(void) | |
46 | { | |
38ab1344 PM |
47 | int irq = irq_alloc_desc(numa_node_id()); |
48 | if (irq >= 0) | |
49 | activate_irq(irq); | |
2be6bb0c PM |
50 | |
51 | return irq; | |
52 | } | |
53 | ||
54 | void destroy_irq(unsigned int irq) | |
55 | { | |
c4318baf | 56 | irq_free_desc(irq); |
2be6bb0c PM |
57 | } |
58 | ||
59 | void reserve_intc_vectors(struct intc_vect *vectors, unsigned int nr_vecs) | |
60 | { | |
2be6bb0c PM |
61 | int i; |
62 | ||
2be6bb0c | 63 | for (i = 0; i < nr_vecs; i++) |
20f95e0b | 64 | irq_reserve_irq(evt2irq(vectors[i].vect)); |
2be6bb0c | 65 | } |