1
2
3#define pr_fmt(fmt) "irq-ls-extirq: " fmt
4
5#include <linux/irq.h>
6#include <linux/irqchip.h>
7#include <linux/irqdomain.h>
8#include <linux/of.h>
9#include <linux/mfd/syscon.h>
10#include <linux/regmap.h>
11#include <linux/slab.h>
12
13#include <dt-bindings/interrupt-controller/arm-gic.h>
14
15#define MAXIRQ 12
16#define LS1021A_SCFGREVCR 0x200
17
18struct ls_extirq_data {
19 struct regmap *syscon;
20 u32 intpcr;
21 bool bit_reverse;
22 u32 nirq;
23 struct irq_fwspec map[MAXIRQ];
24};
25
26static int
27ls_extirq_set_type(struct irq_data *data, unsigned int type)
28{
29 struct ls_extirq_data *priv = data->chip_data;
30 irq_hw_number_t hwirq = data->hwirq;
31 u32 value, mask;
32
33 if (priv->bit_reverse)
34 mask = 1U << (31 - hwirq);
35 else
36 mask = 1U << hwirq;
37
38 switch (type) {
39 case IRQ_TYPE_LEVEL_LOW:
40 type = IRQ_TYPE_LEVEL_HIGH;
41 value = mask;
42 break;
43 case IRQ_TYPE_EDGE_FALLING:
44 type = IRQ_TYPE_EDGE_RISING;
45 value = mask;
46 break;
47 case IRQ_TYPE_LEVEL_HIGH:
48 case IRQ_TYPE_EDGE_RISING:
49 value = 0;
50 break;
51 default:
52 return -EINVAL;
53 }
54 regmap_update_bits(priv->syscon, priv->intpcr, mask, value);
55
56 return irq_chip_set_type_parent(data, type);
57}
58
59static struct irq_chip ls_extirq_chip = {
60 .name = "ls-extirq",
61 .irq_mask = irq_chip_mask_parent,
62 .irq_unmask = irq_chip_unmask_parent,
63 .irq_eoi = irq_chip_eoi_parent,
64 .irq_set_type = ls_extirq_set_type,
65 .irq_retrigger = irq_chip_retrigger_hierarchy,
66 .irq_set_affinity = irq_chip_set_affinity_parent,
67 .flags = IRQCHIP_SET_TYPE_MASKED,
68};
69
70static int
71ls_extirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
72 unsigned int nr_irqs, void *arg)
73{
74 struct ls_extirq_data *priv = domain->host_data;
75 struct irq_fwspec *fwspec = arg;
76 irq_hw_number_t hwirq;
77
78 if (fwspec->param_count != 2)
79 return -EINVAL;
80
81 hwirq = fwspec->param[0];
82 if (hwirq >= priv->nirq)
83 return -EINVAL;
84
85 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &ls_extirq_chip,
86 priv);
87
88 return irq_domain_alloc_irqs_parent(domain, virq, 1, &priv->map[hwirq]);
89}
90
91static const struct irq_domain_ops extirq_domain_ops = {
92 .xlate = irq_domain_xlate_twocell,
93 .alloc = ls_extirq_domain_alloc,
94 .free = irq_domain_free_irqs_common,
95};
96
97static int
98ls_extirq_parse_map(struct ls_extirq_data *priv, struct device_node *node)
99{
100 const __be32 *map;
101 u32 mapsize;
102 int ret;
103
104 map = of_get_property(node, "interrupt-map", &mapsize);
105 if (!map)
106 return -ENOENT;
107 if (mapsize % sizeof(*map))
108 return -EINVAL;
109 mapsize /= sizeof(*map);
110
111 while (mapsize) {
112 struct device_node *ipar;
113 u32 hwirq, intsize, j;
114
115 if (mapsize < 3)
116 return -EINVAL;
117 hwirq = be32_to_cpup(map);
118 if (hwirq >= MAXIRQ)
119 return -EINVAL;
120 priv->nirq = max(priv->nirq, hwirq + 1);
121
122 ipar = of_find_node_by_phandle(be32_to_cpup(map + 2));
123 map += 3;
124 mapsize -= 3;
125 if (!ipar)
126 return -EINVAL;
127 priv->map[hwirq].fwnode = &ipar->fwnode;
128 ret = of_property_read_u32(ipar, "#interrupt-cells", &intsize);
129 if (ret)
130 return ret;
131
132 if (intsize > mapsize)
133 return -EINVAL;
134
135 priv->map[hwirq].param_count = intsize;
136 for (j = 0; j < intsize; ++j)
137 priv->map[hwirq].param[j] = be32_to_cpup(map++);
138 mapsize -= intsize;
139 }
140 return 0;
141}
142
143static int __init
144ls_extirq_of_init(struct device_node *node, struct device_node *parent)
145{
146
147 struct irq_domain *domain, *parent_domain;
148 struct ls_extirq_data *priv;
149 int ret;
150
151 parent_domain = irq_find_host(parent);
152 if (!parent_domain) {
153 pr_err("Cannot find parent domain\n");
154 return -ENODEV;
155 }
156
157 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
158 if (!priv)
159 return -ENOMEM;
160
161 priv->syscon = syscon_node_to_regmap(node->parent);
162 if (IS_ERR(priv->syscon)) {
163 ret = PTR_ERR(priv->syscon);
164 pr_err("Failed to lookup parent regmap\n");
165 goto out;
166 }
167 ret = of_property_read_u32(node, "reg", &priv->intpcr);
168 if (ret) {
169 pr_err("Missing INTPCR offset value\n");
170 goto out;
171 }
172
173 ret = ls_extirq_parse_map(priv, node);
174 if (ret)
175 goto out;
176
177 if (of_device_is_compatible(node, "fsl,ls1021a-extirq")) {
178 u32 revcr;
179
180 ret = regmap_read(priv->syscon, LS1021A_SCFGREVCR, &revcr);
181 if (ret)
182 goto out;
183 priv->bit_reverse = (revcr != 0);
184 }
185
186 domain = irq_domain_add_hierarchy(parent_domain, 0, priv->nirq, node,
187 &extirq_domain_ops, priv);
188 if (!domain)
189 ret = -ENOMEM;
190
191out:
192 if (ret)
193 kfree(priv);
194 return ret;
195}
196
197IRQCHIP_DECLARE(ls1021a_extirq, "fsl,ls1021a-extirq", ls_extirq_of_init);
198
