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cbd1de2e MF |
1 | /* |
2 | * Xtensa built-in interrupt controller | |
3 | * | |
4 | * Copyright (C) 2002 - 2013 Tensilica, Inc. | |
5 | * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General Public | |
8 | * License. See the file "COPYING" in the main directory of this archive | |
9 | * for more details. | |
10 | * | |
11 | * Chris Zankel <chris@zankel.net> | |
12 | * Kevin Chea | |
13 | */ | |
14 | ||
15 | #include <linux/interrupt.h> | |
16 | #include <linux/irqdomain.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/of.h> | |
19 | ||
20 | #include "irqchip.h" | |
21 | ||
22 | unsigned int cached_irq_mask; | |
23 | ||
24 | /* | |
25 | * Device Tree IRQ specifier translation function which works with one or | |
26 | * two cell bindings. First cell value maps directly to the hwirq number. | |
27 | * Second cell if present specifies whether hwirq number is external (1) or | |
28 | * internal (0). | |
29 | */ | |
30 | static int xtensa_pic_irq_domain_xlate(struct irq_domain *d, | |
31 | struct device_node *ctrlr, | |
32 | const u32 *intspec, unsigned int intsize, | |
33 | unsigned long *out_hwirq, unsigned int *out_type) | |
34 | { | |
35 | return xtensa_irq_domain_xlate(intspec, intsize, | |
36 | intspec[0], intspec[0], | |
37 | out_hwirq, out_type); | |
38 | } | |
39 | ||
40 | static const struct irq_domain_ops xtensa_irq_domain_ops = { | |
41 | .xlate = xtensa_pic_irq_domain_xlate, | |
42 | .map = xtensa_irq_map, | |
43 | }; | |
44 | ||
45 | static void xtensa_irq_mask(struct irq_data *d) | |
46 | { | |
47 | cached_irq_mask &= ~(1 << d->hwirq); | |
48 | set_sr(cached_irq_mask, intenable); | |
49 | } | |
50 | ||
51 | static void xtensa_irq_unmask(struct irq_data *d) | |
52 | { | |
53 | cached_irq_mask |= 1 << d->hwirq; | |
54 | set_sr(cached_irq_mask, intenable); | |
55 | } | |
56 | ||
57 | static void xtensa_irq_enable(struct irq_data *d) | |
58 | { | |
59 | variant_irq_enable(d->hwirq); | |
60 | xtensa_irq_unmask(d); | |
61 | } | |
62 | ||
63 | static void xtensa_irq_disable(struct irq_data *d) | |
64 | { | |
65 | xtensa_irq_mask(d); | |
66 | variant_irq_disable(d->hwirq); | |
67 | } | |
68 | ||
69 | static void xtensa_irq_ack(struct irq_data *d) | |
70 | { | |
71 | set_sr(1 << d->hwirq, intclear); | |
72 | } | |
73 | ||
74 | static int xtensa_irq_retrigger(struct irq_data *d) | |
75 | { | |
76 | set_sr(1 << d->hwirq, intset); | |
77 | return 1; | |
78 | } | |
79 | ||
80 | static struct irq_chip xtensa_irq_chip = { | |
81 | .name = "xtensa", | |
82 | .irq_enable = xtensa_irq_enable, | |
83 | .irq_disable = xtensa_irq_disable, | |
84 | .irq_mask = xtensa_irq_mask, | |
85 | .irq_unmask = xtensa_irq_unmask, | |
86 | .irq_ack = xtensa_irq_ack, | |
87 | .irq_retrigger = xtensa_irq_retrigger, | |
88 | }; | |
89 | ||
90 | int __init xtensa_pic_init_legacy(struct device_node *interrupt_parent) | |
91 | { | |
92 | struct irq_domain *root_domain = | |
93 | irq_domain_add_legacy(NULL, NR_IRQS, 0, 0, | |
94 | &xtensa_irq_domain_ops, &xtensa_irq_chip); | |
95 | irq_set_default_host(root_domain); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static int __init xtensa_pic_init(struct device_node *np, | |
100 | struct device_node *interrupt_parent) | |
101 | { | |
102 | struct irq_domain *root_domain = | |
103 | irq_domain_add_linear(np, NR_IRQS, &xtensa_irq_domain_ops, | |
104 | &xtensa_irq_chip); | |
105 | irq_set_default_host(root_domain); | |
106 | return 0; | |
107 | } | |
108 | IRQCHIP_DECLARE(xtensa_irq_chip, "cdns,xtensa-pic", xtensa_pic_init); |