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