tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/irqchip.h>
19#include <linux/of.h>
20
21unsigned int cached_irq_mask;
22
23/*
24 * Device Tree IRQ specifier translation function which works with one or
25 * two cell bindings. First cell value maps directly to the hwirq number.
26 * Second cell if present specifies whether hwirq number is external (1) or
27 * internal (0).
28 */
29static int xtensa_pic_irq_domain_xlate(struct irq_domain *d,
30 struct device_node *ctrlr,
31 const u32 *intspec, unsigned int intsize,
32 unsigned long *out_hwirq, unsigned int *out_type)
33{
34 return xtensa_irq_domain_xlate(intspec, intsize,
35 intspec[0], intspec[0],
36 out_hwirq, out_type);
37}
38
39static const struct irq_domain_ops xtensa_irq_domain_ops = {
40 .xlate = xtensa_pic_irq_domain_xlate,
41 .map = xtensa_irq_map,
42};
43
44static void xtensa_irq_mask(struct irq_data *d)
45{
46 cached_irq_mask &= ~(1 << d->hwirq);
47 set_sr(cached_irq_mask, intenable);
48}
49
50static void xtensa_irq_unmask(struct irq_data *d)
51{
52 cached_irq_mask |= 1 << d->hwirq;
53 set_sr(cached_irq_mask, intenable);
54}
55
56static void xtensa_irq_enable(struct irq_data *d)
57{
58 variant_irq_enable(d->hwirq);
59 xtensa_irq_unmask(d);
60}
61
62static void xtensa_irq_disable(struct irq_data *d)
63{
64 xtensa_irq_mask(d);
65 variant_irq_disable(d->hwirq);
66}
67
68static void xtensa_irq_ack(struct irq_data *d)
69{
70 set_sr(1 << d->hwirq, intclear);
71}
72
73static int xtensa_irq_retrigger(struct irq_data *d)
74{
75 set_sr(1 << d->hwirq, intset);
76 return 1;
77}
78
79static struct irq_chip xtensa_irq_chip = {
80 .name = "xtensa",
81 .irq_enable = xtensa_irq_enable,
82 .irq_disable = xtensa_irq_disable,
83 .irq_mask = xtensa_irq_mask,
84 .irq_unmask = xtensa_irq_unmask,
85 .irq_ack = xtensa_irq_ack,
86 .irq_retrigger = xtensa_irq_retrigger,
87};
88
89int __init xtensa_pic_init_legacy(struct device_node *interrupt_parent)
90{
91 struct irq_domain *root_domain =
92 irq_domain_add_legacy(NULL, NR_IRQS, 0, 0,
93 &xtensa_irq_domain_ops, &xtensa_irq_chip);
94 irq_set_default_host(root_domain);
95 return 0;
96}
97
98static int __init xtensa_pic_init(struct device_node *np,
99 struct device_node *interrupt_parent)
100{
101 struct irq_domain *root_domain =
102 irq_domain_add_linear(np, NR_IRQS, &xtensa_irq_domain_ops,
103 &xtensa_irq_chip);
104 irq_set_default_host(root_domain);
105 return 0;
106}
107IRQCHIP_DECLARE(xtensa_irq_chip, "cdns,xtensa-pic", xtensa_pic_init);