1 /*
2 * H8S interrupt contoller driver
3 *
4 * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
5 */
6
7 #include <linux/irq.h>
8 #include <linux/irqchip.h>
9 #include <linux/of_address.h>
10 #include <linux/of_irq.h>
11 #include <asm/io.h>
12
13 static void *intc_baseaddr;
14 #define IPRA ((unsigned long)intc_baseaddr)
15
16 static const unsigned char ipr_table[] = {
17 0x03, 0x02, 0x01, 0x00, 0x13, 0x12, 0x11, 0x10, /* 16 - 23 */
18 0x23, 0x22, 0x21, 0x20, 0x33, 0x32, 0x31, 0x30, /* 24 - 31 */
19 0x43, 0x42, 0x41, 0x40, 0x53, 0x53, 0x52, 0x52, /* 32 - 39 */
20 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, /* 40 - 47 */
21 0x50, 0x50, 0x50, 0x50, 0x63, 0x63, 0x63, 0x63, /* 48 - 55 */
22 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, /* 56 - 63 */
23 0x61, 0x61, 0x61, 0x61, 0x60, 0x60, 0x60, 0x60, /* 64 - 71 */
24 0x73, 0x73, 0x73, 0x73, 0x72, 0x72, 0x72, 0x72, /* 72 - 79 */
25 0x71, 0x71, 0x71, 0x71, 0x70, 0x83, 0x82, 0x81, /* 80 - 87 */
26 0x80, 0x80, 0x80, 0x80, 0x93, 0x93, 0x93, 0x93, /* 88 - 95 */
27 0x92, 0x92, 0x92, 0x92, 0x91, 0x91, 0x91, 0x91, /* 96 - 103 */
28 0x90, 0x90, 0x90, 0x90, 0xa3, 0xa3, 0xa3, 0xa3, /* 104 - 111 */
29 0xa2, 0xa2, 0xa2, 0xa2, 0xa1, 0xa1, 0xa1, 0xa1, /* 112 - 119 */
30 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, /* 120 - 127 */
31 };
32
h8s_disable_irq(struct irq_data * data)33 static void h8s_disable_irq(struct irq_data *data)
34 {
35 int pos;
36 unsigned int addr;
37 unsigned short pri;
38 int irq = data->irq;
39
40 addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3);
41 pos = (ipr_table[irq - 16] & 0x0f) * 4;
42 pri = ~(0x000f << pos);
43 pri &= ctrl_inw(addr);
44 ctrl_outw(pri, addr);
45 }
46
h8s_enable_irq(struct irq_data * data)47 static void h8s_enable_irq(struct irq_data *data)
48 {
49 int pos;
50 unsigned int addr;
51 unsigned short pri;
52 int irq = data->irq;
53
54 addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3);
55 pos = (ipr_table[irq - 16] & 0x0f) * 4;
56 pri = ~(0x000f << pos);
57 pri &= ctrl_inw(addr);
58 pri |= 1 << pos;
59 ctrl_outw(pri, addr);
60 }
61
62 struct irq_chip h8s_irq_chip = {
63 .name = "H8S-INTC",
64 .irq_enable = h8s_enable_irq,
65 .irq_disable = h8s_disable_irq,
66 };
67
irq_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hw_irq_num)68 static __init int irq_map(struct irq_domain *h, unsigned int virq,
69 irq_hw_number_t hw_irq_num)
70 {
71 irq_set_chip_and_handler(virq, &h8s_irq_chip, handle_simple_irq);
72
73 return 0;
74 }
75
76 static struct irq_domain_ops irq_ops = {
77 .map = irq_map,
78 .xlate = irq_domain_xlate_onecell,
79 };
80
h8s_intc_of_init(struct device_node * intc,struct device_node * parent)81 static int __init h8s_intc_of_init(struct device_node *intc,
82 struct device_node *parent)
83 {
84 struct irq_domain *domain;
85 int n;
86
87 intc_baseaddr = of_iomap(intc, 0);
88 BUG_ON(!intc_baseaddr);
89
90 /* All interrupt priority is 0 (disable) */
91 /* IPRA to IPRK */
92 for (n = 0; n <= 'k' - 'a'; n++)
93 ctrl_outw(0x0000, IPRA + (n * 2));
94
95 domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL);
96 BUG_ON(!domain);
97 irq_set_default_host(domain);
98 return 0;
99 }
100
101 IRQCHIP_DECLARE(h8s_intc, "renesas,h8s-intc", h8s_intc_of_init);
102