1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2014 MediaTek Inc.
4 * Author: Joe.C <yingjoe.chen@mediatek.com>
5 */
6
7 #include <linux/irq.h>
8 #include <linux/irqchip.h>
9 #include <linux/irqdomain.h>
10 #include <linux/of.h>
11 #include <linux/of_irq.h>
12 #include <linux/of_address.h>
13 #include <linux/io.h>
14 #include <linux/slab.h>
15 #include <linux/spinlock.h>
16
17 struct mtk_sysirq_chip_data {
18 spinlock_t lock;
19 u32 nr_intpol_bases;
20 void __iomem **intpol_bases;
21 u32 *intpol_words;
22 u8 *intpol_idx;
23 u16 *which_word;
24 };
25
mtk_sysirq_set_type(struct irq_data * data,unsigned int type)26 static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
27 {
28 irq_hw_number_t hwirq = data->hwirq;
29 struct mtk_sysirq_chip_data *chip_data = data->chip_data;
30 u8 intpol_idx = chip_data->intpol_idx[hwirq];
31 void __iomem *base;
32 u32 offset, reg_index, value;
33 unsigned long flags;
34 int ret;
35
36 base = chip_data->intpol_bases[intpol_idx];
37 reg_index = chip_data->which_word[hwirq];
38 offset = hwirq & 0x1f;
39
40 spin_lock_irqsave(&chip_data->lock, flags);
41 value = readl_relaxed(base + reg_index * 4);
42 if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
43 if (type == IRQ_TYPE_LEVEL_LOW)
44 type = IRQ_TYPE_LEVEL_HIGH;
45 else
46 type = IRQ_TYPE_EDGE_RISING;
47 value |= (1 << offset);
48 } else {
49 value &= ~(1 << offset);
50 }
51
52 writel_relaxed(value, 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
60 static 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
mtk_sysirq_domain_translate(struct irq_domain * d,struct irq_fwspec * fwspec,unsigned long * hwirq,unsigned int * type)70 static 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 /* No PPI should point to this domain */
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
mtk_sysirq_domain_alloc(struct irq_domain * domain,unsigned int virq,unsigned int nr_irqs,void * arg)91 static 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 /* sysirq doesn't support PPI */
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
116 static 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
mtk_sysirq_of_init(struct device_node * node,struct device_node * parent)122 static 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 = 0, nr_intpol_bases = 0, i = 0;
128
129 domain_parent = irq_find_host(parent);
130 if (!domain_parent) {
131 pr_err("mtk_sysirq: interrupt-parent not found\n");
132 return -EINVAL;
133 }
134
135 chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
136 if (!chip_data)
137 return -ENOMEM;
138
139 while (of_get_address(node, i++, NULL, NULL))
140 nr_intpol_bases++;
141
142 if (nr_intpol_bases == 0) {
143 pr_err("mtk_sysirq: base address not specified\n");
144 ret = -EINVAL;
145 goto out_free_chip;
146 }
147
148 chip_data->intpol_words = kcalloc(nr_intpol_bases,
149 sizeof(*chip_data->intpol_words),
150 GFP_KERNEL);
151 if (!chip_data->intpol_words) {
152 ret = -ENOMEM;
153 goto out_free_chip;
154 }
155
156 chip_data->intpol_bases = kcalloc(nr_intpol_bases,
157 sizeof(*chip_data->intpol_bases),
158 GFP_KERNEL);
159 if (!chip_data->intpol_bases) {
160 ret = -ENOMEM;
161 goto out_free_intpol_words;
162 }
163
164 for (i = 0; i < nr_intpol_bases; i++) {
165 struct resource res;
166
167 ret = of_address_to_resource(node, i, &res);
168 size = resource_size(&res);
169 intpol_num += size * 8;
170 chip_data->intpol_words[i] = size / 4;
171 chip_data->intpol_bases[i] = of_iomap(node, i);
172 if (ret || !chip_data->intpol_bases[i]) {
173 pr_err("%pOF: couldn't map region %d\n", node, i);
174 ret = -ENODEV;
175 goto out_free_intpol;
176 }
177 }
178
179 chip_data->intpol_idx = kcalloc(intpol_num,
180 sizeof(*chip_data->intpol_idx),
181 GFP_KERNEL);
182 if (!chip_data->intpol_idx) {
183 ret = -ENOMEM;
184 goto out_free_intpol;
185 }
186
187 chip_data->which_word = kcalloc(intpol_num,
188 sizeof(*chip_data->which_word),
189 GFP_KERNEL);
190 if (!chip_data->which_word) {
191 ret = -ENOMEM;
192 goto out_free_intpol_idx;
193 }
194
195 /*
196 * assign an index of the intpol_bases for each irq
197 * to set it fast later
198 */
199 for (i = 0; i < intpol_num ; i++) {
200 u32 word = i / 32, j;
201
202 for (j = 0; word >= chip_data->intpol_words[j] ; j++)
203 word -= chip_data->intpol_words[j];
204
205 chip_data->intpol_idx[i] = j;
206 chip_data->which_word[i] = word;
207 }
208
209 domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node,
210 &sysirq_domain_ops, chip_data);
211 if (!domain) {
212 ret = -ENOMEM;
213 goto out_free_which_word;
214 }
215 spin_lock_init(&chip_data->lock);
216
217 return 0;
218
219 out_free_which_word:
220 kfree(chip_data->which_word);
221 out_free_intpol_idx:
222 kfree(chip_data->intpol_idx);
223 out_free_intpol:
224 for (i = 0; i < nr_intpol_bases; i++)
225 if (chip_data->intpol_bases[i])
226 iounmap(chip_data->intpol_bases[i]);
227 kfree(chip_data->intpol_bases);
228 out_free_intpol_words:
229 kfree(chip_data->intpol_words);
230 out_free_chip:
231 kfree(chip_data);
232 return ret;
233 }
234 IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init);
235