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f27ffc75 LFT |
1 | /* |
2 | * Copyright (C) 2013 Altera Corporation | |
3 | * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> | |
4 | * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw> | |
5 | * | |
6 | * based on irq.c from m68k which is: | |
7 | * | |
8 | * Copyright (C) 2007 Greg Ungerer <gerg@snapgear.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/init.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/of.h> | |
28 | ||
29 | static u32 ienable; | |
30 | ||
31 | asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) | |
32 | { | |
33 | struct pt_regs *oldregs = set_irq_regs(regs); | |
34 | int irq; | |
35 | ||
36 | irq_enter(); | |
37 | irq = irq_find_mapping(NULL, hwirq); | |
38 | generic_handle_irq(irq); | |
39 | irq_exit(); | |
40 | ||
41 | set_irq_regs(oldregs); | |
42 | } | |
43 | ||
44 | static void chip_unmask(struct irq_data *d) | |
45 | { | |
46 | ienable |= (1 << d->hwirq); | |
47 | WRCTL(CTL_IENABLE, ienable); | |
48 | } | |
49 | ||
50 | static void chip_mask(struct irq_data *d) | |
51 | { | |
52 | ienable &= ~(1 << d->hwirq); | |
53 | WRCTL(CTL_IENABLE, ienable); | |
54 | } | |
55 | ||
56 | static struct irq_chip m_irq_chip = { | |
57 | .name = "NIOS2-INTC", | |
58 | .irq_unmask = chip_unmask, | |
59 | .irq_mask = chip_mask, | |
60 | }; | |
61 | ||
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, &m_irq_chip, handle_level_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 | ||
75 | void __init init_IRQ(void) | |
76 | { | |
77 | struct irq_domain *domain; | |
78 | struct device_node *node; | |
79 | ||
80 | node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.0"); | |
81 | if (!node) | |
82 | node = of_find_compatible_node(NULL, NULL, "altr,nios2-1.1"); | |
83 | ||
84 | BUG_ON(!node); | |
85 | ||
86 | domain = irq_domain_add_linear(node, NIOS2_CPU_NR_IRQS, &irq_ops, NULL); | |
87 | BUG_ON(!domain); | |
88 | ||
89 | irq_set_default_host(domain); | |
90 | of_node_put(node); | |
91 | /* Load the initial ienable value */ | |
92 | ienable = RDCTL(CTL_IENABLE); | |
93 | } |