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15#include <linux/irq.h>
16#include <linux/irqchip.h>
17#include <linux/irqdomain.h>
18#include <linux/of.h>
19#include <linux/of_irq.h>
20#include <linux/of_address.h>
21#include <linux/io.h>
22#include <linux/slab.h>
23#include <linux/spinlock.h>
24
25struct mtk_sysirq_chip_data {
26 spinlock_t lock;
27 void __iomem *intpol_base;
28};
29
30static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
31{
32 irq_hw_number_t hwirq = data->hwirq;
33 struct mtk_sysirq_chip_data *chip_data = data->chip_data;
34 u32 offset, reg_index, value;
35 unsigned long flags;
36 int ret;
37
38 offset = hwirq & 0x1f;
39 reg_index = hwirq >> 5;
40
41 spin_lock_irqsave(&chip_data->lock, flags);
42 value = readl_relaxed(chip_data->intpol_base + reg_index * 4);
43 if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
44 if (type == IRQ_TYPE_LEVEL_LOW)
45 type = IRQ_TYPE_LEVEL_HIGH;
46 else
47 type = IRQ_TYPE_EDGE_RISING;
48 value |= (1 << offset);
49 } else {
50 value &= ~(1 << offset);
51 }
52 writel(value, chip_data->intpol_base + reg_index * 4);
53
54 data = data->parent_data;
55 ret = data->chip->irq_set_type(data, type);
56 spin_unlock_irqrestore(&chip_data->lock, flags);
57 return ret;
58}
59
60static struct irq_chip mtk_sysirq_chip = {
61 .name = "MT_SYSIRQ",
62 .irq_mask = irq_chip_mask_parent,
63 .irq_unmask = irq_chip_unmask_parent,
64 .irq_eoi = irq_chip_eoi_parent,
65 .irq_set_type = mtk_sysirq_set_type,
66 .irq_retrigger = irq_chip_retrigger_hierarchy,
67 .irq_set_affinity = irq_chip_set_affinity_parent,
68};
69
70static int mtk_sysirq_domain_translate(struct irq_domain *d,
71 struct irq_fwspec *fwspec,
72 unsigned long *hwirq,
73 unsigned int *type)
74{
75 if (is_of_node(fwspec->fwnode)) {
76 if (fwspec->param_count != 3)
77 return -EINVAL;
78
79
80 if (fwspec->param[0] != 0)
81 return -EINVAL;
82
83 *hwirq = fwspec->param[1];
84 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
85 return 0;
86 }
87
88 return -EINVAL;
89}
90
91static int mtk_sysirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
92 unsigned int nr_irqs, void *arg)
93{
94 int i;
95 irq_hw_number_t hwirq;
96 struct irq_fwspec *fwspec = arg;
97 struct irq_fwspec gic_fwspec = *fwspec;
98
99 if (fwspec->param_count != 3)
100 return -EINVAL;
101
102
103 if (fwspec->param[0])
104 return -EINVAL;
105
106 hwirq = fwspec->param[1];
107 for (i = 0; i < nr_irqs; i++)
108 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
109 &mtk_sysirq_chip,
110 domain->host_data);
111
112 gic_fwspec.fwnode = domain->parent->fwnode;
113 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_fwspec);
114}
115
116static const struct irq_domain_ops sysirq_domain_ops = {
117 .translate = mtk_sysirq_domain_translate,
118 .alloc = mtk_sysirq_domain_alloc,
119 .free = irq_domain_free_irqs_common,
120};
121
122static int __init mtk_sysirq_of_init(struct device_node *node,
123 struct device_node *parent)
124{
125 struct irq_domain *domain, *domain_parent;
126 struct mtk_sysirq_chip_data *chip_data;
127 int ret, size, intpol_num;
128 struct resource res;
129
130 domain_parent = irq_find_host(parent);
131 if (!domain_parent) {
132 pr_err("mtk_sysirq: interrupt-parent not found\n");
133 return -EINVAL;
134 }
135
136 ret = of_address_to_resource(node, 0, &res);
137 if (ret)
138 return ret;
139
140 chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
141 if (!chip_data)
142 return -ENOMEM;
143
144 size = resource_size(&res);
145 intpol_num = size * 8;
146 chip_data->intpol_base = ioremap(res.start, size);
147 if (!chip_data->intpol_base) {
148 pr_err("mtk_sysirq: unable to map sysirq register\n");
149 ret = -ENXIO;
150 goto out_free;
151 }
152
153 domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node,
154 &sysirq_domain_ops, chip_data);
155 if (!domain) {
156 ret = -ENOMEM;
157 goto out_unmap;
158 }
159 spin_lock_init(&chip_data->lock);
160
161 return 0;
162
163out_unmap:
164 iounmap(chip_data->intpol_base);
165out_free:
166 kfree(chip_data);
167 return ret;
168}
169IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init);
170
