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