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
14 static 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
24 static void *intc_baseaddr;
25
26 #define IPR ((unsigned long)intc_baseaddr + 6)
27
h8300h_disable_irq(struct irq_data * data)28 static 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
h8300h_enable_irq(struct irq_data * data)42 static 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
56 struct irq_chip h8300h_irq_chip = {
57 .name = "H8/300H-INTC",
58 .irq_enable = h8300h_enable_irq,
59 .irq_disable = h8300h_disable_irq,
60 };
61
irq_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hw_irq_num)62 static 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
70 static struct irq_domain_ops irq_ops = {
71 .map = irq_map,
72 .xlate = irq_domain_xlate_onecell,
73 };
74
h8300h_intc_of_init(struct device_node * intc,struct device_node * parent)75 static 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 ctrl_outb(0x00, IPR + 0);
85 ctrl_outb(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
93 IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init);
94