1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
4 * Ingenic XBurst platform IRQ support
5 */
6
7 #include <linux/errno.h>
8 #include <linux/init.h>
9 #include <linux/types.h>
10 #include <linux/interrupt.h>
11 #include <linux/ioport.h>
12 #include <linux/irqchip.h>
13 #include <linux/of_address.h>
14 #include <linux/of_irq.h>
15 #include <linux/timex.h>
16 #include <linux/slab.h>
17 #include <linux/delay.h>
18
19 #include <asm/io.h>
20
21 struct ingenic_intc_data {
22 void __iomem *base;
23 struct irq_domain *domain;
24 unsigned num_chips;
25 };
26
27 #define JZ_REG_INTC_STATUS 0x00
28 #define JZ_REG_INTC_MASK 0x04
29 #define JZ_REG_INTC_SET_MASK 0x08
30 #define JZ_REG_INTC_CLEAR_MASK 0x0c
31 #define JZ_REG_INTC_PENDING 0x10
32 #define CHIP_SIZE 0x20
33
intc_cascade(int irq,void * data)34 static irqreturn_t intc_cascade(int irq, void *data)
35 {
36 struct ingenic_intc_data *intc = irq_get_handler_data(irq);
37 struct irq_domain *domain = intc->domain;
38 struct irq_chip_generic *gc;
39 uint32_t pending;
40 unsigned i;
41
42 for (i = 0; i < intc->num_chips; i++) {
43 gc = irq_get_domain_generic_chip(domain, i * 32);
44
45 pending = irq_reg_readl(gc, JZ_REG_INTC_PENDING);
46 if (!pending)
47 continue;
48
49 while (pending) {
50 int bit = __fls(pending);
51
52 generic_handle_domain_irq(domain, bit + (i * 32));
53 pending &= ~BIT(bit);
54 }
55 }
56
57 return IRQ_HANDLED;
58 }
59
ingenic_intc_of_init(struct device_node * node,unsigned num_chips)60 static int __init ingenic_intc_of_init(struct device_node *node,
61 unsigned num_chips)
62 {
63 struct ingenic_intc_data *intc;
64 struct irq_chip_generic *gc;
65 struct irq_chip_type *ct;
66 struct irq_domain *domain;
67 int parent_irq, err = 0;
68 unsigned i;
69
70 intc = kzalloc(sizeof(*intc), GFP_KERNEL);
71 if (!intc) {
72 err = -ENOMEM;
73 goto out_err;
74 }
75
76 parent_irq = irq_of_parse_and_map(node, 0);
77 if (!parent_irq) {
78 err = -EINVAL;
79 goto out_free;
80 }
81
82 err = irq_set_handler_data(parent_irq, intc);
83 if (err)
84 goto out_unmap_irq;
85
86 intc->num_chips = num_chips;
87 intc->base = of_iomap(node, 0);
88 if (!intc->base) {
89 err = -ENODEV;
90 goto out_unmap_irq;
91 }
92
93 domain = irq_domain_add_linear(node, num_chips * 32,
94 &irq_generic_chip_ops, NULL);
95 if (!domain) {
96 err = -ENOMEM;
97 goto out_unmap_base;
98 }
99
100 intc->domain = domain;
101
102 err = irq_alloc_domain_generic_chips(domain, 32, 1, "INTC",
103 handle_level_irq, 0,
104 IRQ_NOPROBE | IRQ_LEVEL, 0);
105 if (err)
106 goto out_domain_remove;
107
108 for (i = 0; i < num_chips; i++) {
109 gc = irq_get_domain_generic_chip(domain, i * 32);
110
111 gc->wake_enabled = IRQ_MSK(32);
112 gc->reg_base = intc->base + (i * CHIP_SIZE);
113
114 ct = gc->chip_types;
115 ct->regs.enable = JZ_REG_INTC_CLEAR_MASK;
116 ct->regs.disable = JZ_REG_INTC_SET_MASK;
117 ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
118 ct->chip.irq_mask = irq_gc_mask_disable_reg;
119 ct->chip.irq_mask_ack = irq_gc_mask_disable_reg;
120 ct->chip.irq_set_wake = irq_gc_set_wake;
121 ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND;
122
123 /* Mask all irqs */
124 irq_reg_writel(gc, IRQ_MSK(32), JZ_REG_INTC_SET_MASK);
125 }
126
127 if (request_irq(parent_irq, intc_cascade, IRQF_NO_SUSPEND,
128 "SoC intc cascade interrupt", NULL))
129 pr_err("Failed to register SoC intc cascade interrupt\n");
130 return 0;
131
132 out_domain_remove:
133 irq_domain_remove(domain);
134 out_unmap_base:
135 iounmap(intc->base);
136 out_unmap_irq:
137 irq_dispose_mapping(parent_irq);
138 out_free:
139 kfree(intc);
140 out_err:
141 return err;
142 }
143
intc_1chip_of_init(struct device_node * node,struct device_node * parent)144 static int __init intc_1chip_of_init(struct device_node *node,
145 struct device_node *parent)
146 {
147 return ingenic_intc_of_init(node, 1);
148 }
149 IRQCHIP_DECLARE(jz4740_intc, "ingenic,jz4740-intc", intc_1chip_of_init);
150 IRQCHIP_DECLARE(jz4725b_intc, "ingenic,jz4725b-intc", intc_1chip_of_init);
151
intc_2chip_of_init(struct device_node * node,struct device_node * parent)152 static int __init intc_2chip_of_init(struct device_node *node,
153 struct device_node *parent)
154 {
155 return ingenic_intc_of_init(node, 2);
156 }
157 IRQCHIP_DECLARE(jz4760_intc, "ingenic,jz4760-intc", intc_2chip_of_init);
158 IRQCHIP_DECLARE(jz4770_intc, "ingenic,jz4770-intc", intc_2chip_of_init);
159 IRQCHIP_DECLARE(jz4775_intc, "ingenic,jz4775-intc", intc_2chip_of_init);
160 IRQCHIP_DECLARE(jz4780_intc, "ingenic,jz4780-intc", intc_2chip_of_init);
161