Commit | Line | Data |
---|---|---|
1d6a21b0 PM |
1 | /* |
2 | * IRQ domain support for SH INTC subsystem | |
3 | * | |
4 | * Copyright (C) 2012 Paul Mundt | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | #define pr_fmt(fmt) "intc: " fmt | |
11 | ||
12 | #include <linux/irqdomain.h> | |
13 | #include <linux/sh_intc.h> | |
14 | #include <linux/export.h> | |
15 | #include "internals.h" | |
16 | ||
17 | /** | |
18 | * intc_irq_domain_evt_xlate() - Generic xlate for vectored IRQs. | |
19 | * | |
20 | * This takes care of exception vector to hwirq translation through | |
21 | * by way of evt2irq() translation. | |
22 | * | |
23 | * Note: For platforms that use a flat vector space without INTEVT this | |
24 | * basically just mimics irq_domain_xlate_onecell() by way of a nopped | |
25 | * out evt2irq() implementation. | |
26 | */ | |
27 | static int intc_evt_xlate(struct irq_domain *d, struct device_node *ctrlr, | |
28 | const u32 *intspec, unsigned int intsize, | |
29 | unsigned long *out_hwirq, unsigned int *out_type) | |
30 | { | |
31 | if (WARN_ON(intsize < 1)) | |
32 | return -EINVAL; | |
33 | ||
34 | *out_hwirq = evt2irq(intspec[0]); | |
35 | *out_type = IRQ_TYPE_NONE; | |
36 | ||
37 | return 0; | |
38 | } | |
39 | ||
40 | static const struct irq_domain_ops intc_evt_ops = { | |
41 | .xlate = intc_evt_xlate, | |
42 | }; | |
43 | ||
44 | void __init intc_irq_domain_init(struct intc_desc_int *d, | |
45 | struct intc_hw_desc *hw) | |
46 | { | |
47 | unsigned int irq_base, irq_end; | |
48 | ||
49 | /* | |
50 | * Quick linear revmap check | |
51 | */ | |
52 | irq_base = evt2irq(hw->vectors[0].vect); | |
53 | irq_end = evt2irq(hw->vectors[hw->nr_vectors - 1].vect); | |
54 | ||
55 | /* | |
56 | * Linear domains have a hard-wired assertion that IRQs start at | |
57 | * 0 in order to make some performance optimizations. Lamely | |
58 | * restrict the linear case to these conditions here, taking the | |
59 | * tree penalty for linear cases with non-zero hwirq bases. | |
60 | */ | |
61 | if (irq_base == 0 && irq_end == (irq_base + hw->nr_vectors - 1)) | |
62 | d->domain = irq_domain_add_linear(NULL, hw->nr_vectors, | |
63 | &intc_evt_ops, NULL); | |
64 | else | |
65 | d->domain = irq_domain_add_tree(NULL, &intc_evt_ops, NULL); | |
66 | ||
67 | BUG_ON(!d->domain); | |
68 | } |