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
15 static 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
25 static void __iomem *intc_baseaddr;
26
27 #define IPR (intc_baseaddr + 6)
28
h8300h_disable_irq(struct irq_data * data)29 static 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
h8300h_enable_irq(struct irq_data * data)43 static 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
57 struct irq_chip h8300h_irq_chip = {
58 .name = "H8/300H-INTC",
59 .irq_enable = h8300h_enable_irq,
60 .irq_disable = h8300h_disable_irq,
61 };
62
irq_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hw_irq_num)63 static 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
71 static const struct irq_domain_ops irq_ops = {
72 .map = irq_map,
73 .xlate = irq_domain_xlate_onecell,
74 };
75
h8300h_intc_of_init(struct device_node * intc,struct device_node * parent)76 static 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
94 IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init);
95