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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * H8/300H interrupt controller driver
4 *
5 * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
6 */
7
8#include <linux/init.h>
9#include <linux/irq.h>
10#include <linux/irqchip.h>
11#include <linux/of_address.h>
12#include <linux/of_irq.h>
13#include <asm/io.h>
14
15static const char ipr_bit[] = {
16 7, 6, 5, 5,
17 4, 4, 4, 4, 3, 3, 3, 3,
18 2, 2, 2, 2, 1, 1, 1, 1,
19 0, 0, 0, 0, 15, 15, 15, 15,
20 14, 14, 14, 14, 13, 13, 13, 13,
21 -1, -1, -1, -1, 11, 11, 11, 11,
22 10, 10, 10, 10, 9, 9, 9, 9,
23};
24
25static void __iomem *intc_baseaddr;
26
27#define IPR (intc_baseaddr + 6)
28
29static void h8300h_disable_irq(struct irq_data *data)
30{
31 int bit;
32 int irq = data->irq - 12;
33
34 bit = ipr_bit[irq];
35 if (bit >= 0) {
36 if (bit < 8)
37 ctrl_bclr(bit & 7, IPR);
38 else
39 ctrl_bclr(bit & 7, (IPR+1));
40 }
41}
42
43static void h8300h_enable_irq(struct irq_data *data)
44{
45 int bit;
46 int irq = data->irq - 12;
47
48 bit = ipr_bit[irq];
49 if (bit >= 0) {
50 if (bit < 8)
51 ctrl_bset(bit & 7, IPR);
52 else
53 ctrl_bset(bit & 7, (IPR+1));
54 }
55}
56
57struct irq_chip h8300h_irq_chip = {
58 .name = "H8/300H-INTC",
59 .irq_enable = h8300h_enable_irq,
60 .irq_disable = h8300h_disable_irq,
61};
62
63static int irq_map(struct irq_domain *h, unsigned int virq,
64 irq_hw_number_t hw_irq_num)
65{
66 irq_set_chip_and_handler(virq, &h8300h_irq_chip, handle_simple_irq);
67
68 return 0;
69}
70
71static const struct irq_domain_ops irq_ops = {
72 .map = irq_map,
73 .xlate = irq_domain_xlate_onecell,
74};
75
76static int __init h8300h_intc_of_init(struct device_node *intc,
77 struct device_node *parent)
78{
79 struct irq_domain *domain;
80
81 intc_baseaddr = of_iomap(intc, 0);
82 BUG_ON(!intc_baseaddr);
83
84 /* All interrupt priority low */
85 writeb(0x00, IPR + 0);
86 writeb(0x00, IPR + 1);
87
88 domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL);
89 BUG_ON(!domain);
90 irq_set_default_host(domain);
91 return 0;
92}
93
94IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init);
95

Warning: That file was not part of the compilation database. It may have many parsing errors.