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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
8a764482 YS |
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 | ||
8a764482 YS |
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 | ||
75160515 | 25 | static void __iomem *intc_baseaddr; |
8a764482 | 26 | |
75160515 | 27 | #define IPR (intc_baseaddr + 6) |
8a764482 YS |
28 | |
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 | ||
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 | ||
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 | ||
580393cc | 71 | static const struct irq_domain_ops irq_ops = { |
8a764482 YS |
72 | .map = irq_map, |
73 | .xlate = irq_domain_xlate_onecell, | |
74 | }; | |
75 | ||
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 */ | |
75160515 DL |
85 | writeb(0x00, IPR + 0); |
86 | writeb(0x00, IPR + 1); | |
8a764482 YS |
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); |