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4de563ae JJ |
1 | /* |
2 | * MOXA ART SoCs IRQ chip driver. | |
3 | * | |
4 | * Copyright (C) 2013 Jonas Jensen | |
5 | * | |
6 | * Jonas Jensen <jonas.jensen@gmail.com> | |
7 | * | |
8 | * This file is licensed under the terms of the GNU General Public | |
9 | * License version 2. This program is licensed "as is" without any | |
10 | * warranty of any kind, whether express or implied. | |
11 | */ | |
12 | ||
13 | #include <linux/io.h> | |
14 | #include <linux/irq.h> | |
41a83e06 | 15 | #include <linux/irqchip.h> |
4de563ae JJ |
16 | #include <linux/of.h> |
17 | #include <linux/of_address.h> | |
18 | #include <linux/of_irq.h> | |
19 | #include <linux/irqdomain.h> | |
20 | ||
21 | #include <asm/exception.h> | |
22 | ||
4de563ae JJ |
23 | #define IRQ_SOURCE_REG 0 |
24 | #define IRQ_MASK_REG 0x04 | |
25 | #define IRQ_CLEAR_REG 0x08 | |
26 | #define IRQ_MODE_REG 0x0c | |
27 | #define IRQ_LEVEL_REG 0x10 | |
28 | #define IRQ_STATUS_REG 0x14 | |
29 | ||
30 | #define FIQ_SOURCE_REG 0x20 | |
31 | #define FIQ_MASK_REG 0x24 | |
32 | #define FIQ_CLEAR_REG 0x28 | |
33 | #define FIQ_MODE_REG 0x2c | |
34 | #define FIQ_LEVEL_REG 0x30 | |
35 | #define FIQ_STATUS_REG 0x34 | |
36 | ||
37 | ||
38 | struct moxart_irq_data { | |
39 | void __iomem *base; | |
40 | struct irq_domain *domain; | |
41 | unsigned int interrupt_mask; | |
42 | }; | |
43 | ||
44 | static struct moxart_irq_data intc; | |
45 | ||
8783dd3a | 46 | static void __exception_irq_entry handle_irq(struct pt_regs *regs) |
4de563ae JJ |
47 | { |
48 | u32 irqstat; | |
49 | int hwirq; | |
50 | ||
51 | irqstat = readl(intc.base + IRQ_STATUS_REG); | |
52 | ||
53 | while (irqstat) { | |
54 | hwirq = ffs(irqstat) - 1; | |
55 | handle_IRQ(irq_linear_revmap(intc.domain, hwirq), regs); | |
56 | irqstat &= ~(1 << hwirq); | |
57 | } | |
58 | } | |
59 | ||
60 | static int __init moxart_of_intc_init(struct device_node *node, | |
61 | struct device_node *parent) | |
62 | { | |
63 | unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN; | |
64 | int ret; | |
65 | struct irq_chip_generic *gc; | |
66 | ||
67 | intc.base = of_iomap(node, 0); | |
68 | if (!intc.base) { | |
69 | pr_err("%s: unable to map IC registers\n", | |
70 | node->full_name); | |
71 | return -EINVAL; | |
72 | } | |
73 | ||
74 | intc.domain = irq_domain_add_linear(node, 32, &irq_generic_chip_ops, | |
75 | intc.base); | |
76 | if (!intc.domain) { | |
77 | pr_err("%s: unable to create IRQ domain\n", node->full_name); | |
78 | return -EINVAL; | |
79 | } | |
80 | ||
81 | ret = irq_alloc_domain_generic_chips(intc.domain, 32, 1, | |
82 | "MOXARTINTC", handle_edge_irq, | |
83 | clr, 0, IRQ_GC_INIT_MASK_CACHE); | |
84 | if (ret) { | |
85 | pr_err("%s: could not allocate generic chip\n", | |
86 | node->full_name); | |
87 | irq_domain_remove(intc.domain); | |
88 | return -EINVAL; | |
89 | } | |
90 | ||
91 | ret = of_property_read_u32(node, "interrupt-mask", | |
92 | &intc.interrupt_mask); | |
93 | if (ret) | |
94 | pr_err("%s: could not read interrupt-mask DT property\n", | |
95 | node->full_name); | |
96 | ||
97 | gc = irq_get_domain_generic_chip(intc.domain, 0); | |
98 | ||
99 | gc->reg_base = intc.base; | |
100 | gc->chip_types[0].regs.mask = IRQ_MASK_REG; | |
101 | gc->chip_types[0].regs.ack = IRQ_CLEAR_REG; | |
102 | gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit; | |
103 | gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit; | |
104 | gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit; | |
105 | ||
106 | writel(0, intc.base + IRQ_MASK_REG); | |
107 | writel(0xffffffff, intc.base + IRQ_CLEAR_REG); | |
108 | ||
109 | writel(intc.interrupt_mask, intc.base + IRQ_MODE_REG); | |
110 | writel(intc.interrupt_mask, intc.base + IRQ_LEVEL_REG); | |
111 | ||
112 | set_handle_irq(handle_irq); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | IRQCHIP_DECLARE(moxa_moxart_ic, "moxa,moxart-ic", moxart_of_intc_init); |