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/irqchip/xtensa-pic.h>
20 #include <linux/of.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 */
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)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
xtensa_irq_mask(struct irq_data * d)45 static void xtensa_irq_mask(struct irq_data *d)
46 {
47 cached_irq_mask &= ~(1 << d->hwirq);
48 xtensa_set_sr(cached_irq_mask, intenable);
49 }
50
xtensa_irq_unmask(struct irq_data * d)51 static void xtensa_irq_unmask(struct irq_data *d)
52 {
53 cached_irq_mask |= 1 << d->hwirq;
54 xtensa_set_sr(cached_irq_mask, intenable);
55 }
56
xtensa_irq_enable(struct irq_data * d)57 static void xtensa_irq_enable(struct irq_data *d)
58 {
59 xtensa_irq_unmask(d);
60 }
61
xtensa_irq_disable(struct irq_data * d)62 static void xtensa_irq_disable(struct irq_data *d)
63 {
64 xtensa_irq_mask(d);
65 }
66
xtensa_irq_ack(struct irq_data * d)67 static void xtensa_irq_ack(struct irq_data *d)
68 {
69 xtensa_set_sr(1 << d->hwirq, intclear);
70 }
71
xtensa_irq_retrigger(struct irq_data * d)72 static int xtensa_irq_retrigger(struct irq_data *d)
73 {
74 unsigned int mask = 1u << d->hwirq;
75
76 if (WARN_ON(mask & ~XCHAL_INTTYPE_MASK_SOFTWARE))
77 return 0;
78 xtensa_set_sr(mask, intset);
79 return 1;
80 }
81
82 static struct irq_chip xtensa_irq_chip = {
83 .name = "xtensa",
84 .irq_enable = xtensa_irq_enable,
85 .irq_disable = xtensa_irq_disable,
86 .irq_mask = xtensa_irq_mask,
87 .irq_unmask = xtensa_irq_unmask,
88 .irq_ack = xtensa_irq_ack,
89 .irq_retrigger = xtensa_irq_retrigger,
90 };
91
xtensa_pic_init_legacy(struct device_node * interrupt_parent)92 int __init xtensa_pic_init_legacy(struct device_node *interrupt_parent)
93 {
94 struct irq_domain *root_domain =
95 irq_domain_add_legacy(NULL, NR_IRQS - 1, 1, 0,
96 &xtensa_irq_domain_ops, &xtensa_irq_chip);
97 irq_set_default_host(root_domain);
98 return 0;
99 }
100
xtensa_pic_init(struct device_node * np,struct device_node * interrupt_parent)101 static int __init xtensa_pic_init(struct device_node *np,
102 struct device_node *interrupt_parent)
103 {
104 struct irq_domain *root_domain =
105 irq_domain_add_linear(np, NR_IRQS, &xtensa_irq_domain_ops,
106 &xtensa_irq_chip);
107 irq_set_default_host(root_domain);
108 return 0;
109 }
110 IRQCHIP_DECLARE(xtensa_irq_chip, "cdns,xtensa-pic", xtensa_pic_init);
111