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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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2 | /* |
3 | * Copyright (C) 2013 Altera Corporation | |
4 | * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> | |
5 | * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw> | |
6 | * | |
7 | * based on irq.c from m68k which is: | |
8 | * | |
9 | * Copyright (C) 2007 Greg Ungerer <gerg@snapgear.com> | |
f27ffc75 LFT |
10 | */ |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
9bd1cc41 | 14 | #include <linux/irqdomain.h> |
f27ffc75 LFT |
15 | #include <linux/of.h> |
16 | ||
17 | static u32 ienable; | |
18 | ||
19 | asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) | |
20 | { | |
21 | struct pt_regs *oldregs = set_irq_regs(regs); | |
f27ffc75 LFT |
22 | |
23 | irq_enter(); | |
153517d4 | 24 | generic_handle_domain_irq(NULL, hwirq); |
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25 | irq_exit(); |
26 | ||
27 | set_irq_regs(oldregs); | |
28 | } | |
29 | ||
30 | static void chip_unmask(struct irq_data *d) | |
31 | { | |
32 | ienable |= (1 << d->hwirq); | |
33 | WRCTL(CTL_IENABLE, ienable); | |
34 | } | |
35 | ||
36 | static void chip_mask(struct irq_data *d) | |
37 | { | |
38 | ienable &= ~(1 << d->hwirq); | |
39 | WRCTL(CTL_IENABLE, ienable); | |
40 | } | |
41 | ||
42 | static struct irq_chip m_irq_chip = { | |
43 | .name = "NIOS2-INTC", | |
44 | .irq_unmask = chip_unmask, | |
45 | .irq_mask = chip_mask, | |
46 | }; | |
47 | ||
48 | static int irq_map(struct irq_domain *h, unsigned int virq, | |
49 | irq_hw_number_t hw_irq_num) | |
50 | { | |
51 | irq_set_chip_and_handler(virq, &m_irq_chip, handle_level_irq); | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
57ac76ed | 56 | static const struct irq_domain_ops irq_ops = { |
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57 | .map = irq_map, |
58 | .xlate = irq_domain_xlate_onecell, | |
59 | }; | |
60 | ||
61 | void __init init_IRQ(void) | |
62 | { | |
63 | struct irq_domain *domain; | |
64 | struct device_node *node; | |
65 | ||
66 | node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.0"); | |
67 | if (!node) | |
68 | node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.1"); | |
69 | ||
70 | BUG_ON(!node); | |
71 | ||
72 | domain = irq_domain_add_linear(node, NIOS2_CPU_NR_IRQS, &irq_ops, NULL); | |
73 | BUG_ON(!domain); | |
74 | ||
75 | irq_set_default_host(domain); | |
76 | of_node_put(node); | |
77 | /* Load the initial ienable value */ | |
78 | ienable = RDCTL(CTL_IENABLE); | |
79 | } |