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
21 unsigned 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 */
xtensa_pic_irq_domain_xlate(struct irq_domain * d,struct device_node * ctrlr,const u32 * intspec,unsigned int intsize,unsigned long * out_hwirq,unsigned int * out_type)29 static 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
39 static const struct irq_domain_ops xtensa_irq_domain_ops = {
40 .xlate = xtensa_pic_irq_domain_xlate,
41 .map = xtensa_irq_map,
42 };
43
xtensa_irq_mask(struct irq_data * d)44 static void xtensa_irq_mask(struct irq_data *d)
45 {
46 cached_irq_mask &= ~(1 << d->hwirq);
47 xtensa_set_sr(cached_irq_mask, intenable);
48 }
49
xtensa_irq_unmask(struct irq_data * d)50 static void xtensa_irq_unmask(struct irq_data *d)
51 {
52 cached_irq_mask |= 1 << d->hwirq;
53 xtensa_set_sr(cached_irq_mask, intenable);
54 }
55
xtensa_irq_enable(struct irq_data * d)56 static void xtensa_irq_enable(struct irq_data *d)
57 {
58 xtensa_irq_unmask(d);
59 }
60
xtensa_irq_disable(struct irq_data * d)61 static void xtensa_irq_disable(struct irq_data *d)
62 {
63 xtensa_irq_mask(d);
64 }
65
xtensa_irq_ack(struct irq_data * d)66 static void xtensa_irq_ack(struct irq_data *d)
67 {
68 xtensa_set_sr(1 << d->hwirq, intclear);
69 }
70
xtensa_irq_retrigger(struct irq_data * d)71 static int xtensa_irq_retrigger(struct irq_data *d)
72 {
73 unsigned int mask = 1u << d->hwirq;
74
75 if (WARN_ON(mask & ~XCHAL_INTTYPE_MASK_SOFTWARE))
76 return 0;
77 xtensa_set_sr(mask, intset);
78 return 1;
79 }
80
81 static struct irq_chip xtensa_irq_chip = {
82 .name = "xtensa",
83 .irq_enable = xtensa_irq_enable,
84 .irq_disable = xtensa_irq_disable,
85 .irq_mask = xtensa_irq_mask,
86 .irq_unmask = xtensa_irq_unmask,
87 .irq_ack = xtensa_irq_ack,
88 .irq_retrigger = xtensa_irq_retrigger,
89 };
90
xtensa_pic_init_legacy(struct device_node * interrupt_parent)91 int __init xtensa_pic_init_legacy(struct device_node *interrupt_parent)
92 {
93 struct irq_domain *root_domain =
94 irq_domain_add_legacy(NULL, NR_IRQS - 1, 1, 0,
95 &xtensa_irq_domain_ops, &xtensa_irq_chip);
96 irq_set_default_host(root_domain);
97 return 0;
98 }
99
xtensa_pic_init(struct device_node * np,struct device_node * interrupt_parent)100 static int __init xtensa_pic_init(struct device_node *np,
101 struct device_node *interrupt_parent)
102 {
103 struct irq_domain *root_domain =
104 irq_domain_add_linear(np, NR_IRQS, &xtensa_irq_domain_ops,
105 &xtensa_irq_chip);
106 irq_set_default_host(root_domain);
107 return 0;
108 }
109 IRQCHIP_DECLARE(xtensa_irq_chip, "cdns,xtensa-pic", xtensa_pic_init);
110