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1/*
2 * Copyright (c) 2016 MediaTek Inc.
3 * Author: Youlin.Pei <youlin.pei@mediatek.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/irq.h>
18#include <linux/irqchip.h>
19#include <linux/irqdomain.h>
20#include <linux/of.h>
21#include <linux/of_irq.h>
22#include <linux/of_address.h>
23#include <linux/slab.h>
24#include <linux/syscore_ops.h>
25
26#define CIRQ_ACK 0x40
27#define CIRQ_MASK_SET 0xc0
28#define CIRQ_MASK_CLR 0x100
29#define CIRQ_SENS_SET 0x180
30#define CIRQ_SENS_CLR 0x1c0
31#define CIRQ_POL_SET 0x240
32#define CIRQ_POL_CLR 0x280
33#define CIRQ_CONTROL 0x300
34
35#define CIRQ_EN 0x1
36#define CIRQ_EDGE 0x2
37#define CIRQ_FLUSH 0x4
38
39struct mtk_cirq_chip_data {
40 void __iomem *base;
41 unsigned int ext_irq_start;
42 unsigned int ext_irq_end;
43 struct irq_domain *domain;
44};
45
46static struct mtk_cirq_chip_data *cirq_data;
47
48static void mtk_cirq_write_mask(struct irq_data *data, unsigned int offset)
49{
50 struct mtk_cirq_chip_data *chip_data = data->chip_data;
51 unsigned int cirq_num = data->hwirq;
52 u32 mask = 1 << (cirq_num % 32);
53
54 writel_relaxed(mask, chip_data->base + offset + (cirq_num / 32) * 4);
55}
56
57static void mtk_cirq_mask(struct irq_data *data)
58{
59 mtk_cirq_write_mask(data, CIRQ_MASK_SET);
60 irq_chip_mask_parent(data);
61}
62
63static void mtk_cirq_unmask(struct irq_data *data)
64{
65 mtk_cirq_write_mask(data, CIRQ_MASK_CLR);
66 irq_chip_unmask_parent(data);
67}
68
69static int mtk_cirq_set_type(struct irq_data *data, unsigned int type)
70{
71 int ret;
72
73 switch (type & IRQ_TYPE_SENSE_MASK) {
74 case IRQ_TYPE_EDGE_FALLING:
75 mtk_cirq_write_mask(data, CIRQ_POL_CLR);
76 mtk_cirq_write_mask(data, CIRQ_SENS_CLR);
77 break;
78 case IRQ_TYPE_EDGE_RISING:
79 mtk_cirq_write_mask(data, CIRQ_POL_SET);
80 mtk_cirq_write_mask(data, CIRQ_SENS_CLR);
81 break;
82 case IRQ_TYPE_LEVEL_LOW:
83 mtk_cirq_write_mask(data, CIRQ_POL_CLR);
84 mtk_cirq_write_mask(data, CIRQ_SENS_SET);
85 break;
86 case IRQ_TYPE_LEVEL_HIGH:
87 mtk_cirq_write_mask(data, CIRQ_POL_SET);
88 mtk_cirq_write_mask(data, CIRQ_SENS_SET);
89 break;
90 default:
91 break;
92 }
93
94 data = data->parent_data;
95 ret = data->chip->irq_set_type(data, type);
96 return ret;
97}
98
99static struct irq_chip mtk_cirq_chip = {
100 .name = "MT_CIRQ",
101 .irq_mask = mtk_cirq_mask,
102 .irq_unmask = mtk_cirq_unmask,
103 .irq_eoi = irq_chip_eoi_parent,
104 .irq_set_type = mtk_cirq_set_type,
105 .irq_retrigger = irq_chip_retrigger_hierarchy,
106#ifdef CONFIG_SMP
107 .irq_set_affinity = irq_chip_set_affinity_parent,
108#endif
109};
110
111static int mtk_cirq_domain_translate(struct irq_domain *d,
112 struct irq_fwspec *fwspec,
113 unsigned long *hwirq,
114 unsigned int *type)
115{
116 if (is_of_node(fwspec->fwnode)) {
117 if (fwspec->param_count != 3)
118 return -EINVAL;
119
120 /* No PPI should point to this domain */
121 if (fwspec->param[0] != 0)
122 return -EINVAL;
123
124 /* cirq support irq number check */
125 if (fwspec->param[1] < cirq_data->ext_irq_start ||
126 fwspec->param[1] > cirq_data->ext_irq_end)
127 return -EINVAL;
128
129 *hwirq = fwspec->param[1] - cirq_data->ext_irq_start;
130 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
131 return 0;
132 }
133
134 return -EINVAL;
135}
136
137static int mtk_cirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
138 unsigned int nr_irqs, void *arg)
139{
140 int ret;
141 irq_hw_number_t hwirq;
142 unsigned int type;
143 struct irq_fwspec *fwspec = arg;
144 struct irq_fwspec parent_fwspec = *fwspec;
145
146 ret = mtk_cirq_domain_translate(domain, fwspec, &hwirq, &type);
147 if (ret)
148 return ret;
149
150 if (WARN_ON(nr_irqs != 1))
151 return -EINVAL;
152
153 irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
154 &mtk_cirq_chip,
155 domain->host_data);
156
157 parent_fwspec.fwnode = domain->parent->fwnode;
158 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
159 &parent_fwspec);
160}
161
162static const struct irq_domain_ops cirq_domain_ops = {
163 .translate = mtk_cirq_domain_translate,
164 .alloc = mtk_cirq_domain_alloc,
165 .free = irq_domain_free_irqs_common,
166};
167
168#ifdef CONFIG_PM_SLEEP
169static int mtk_cirq_suspend(void)
170{
171 u32 value, mask;
172 unsigned int irq, hwirq_num;
173 bool pending, masked;
174 int i, pendret, maskret;
175
176 /*
177 * When external interrupts happened, CIRQ will record the status
178 * even CIRQ is not enabled. When execute flush command, CIRQ will
179 * resend the signals according to the status. So if don't clear the
180 * status, CIRQ will resend the wrong signals.
181 *
182 * arch_suspend_disable_irqs() will be called before CIRQ suspend
183 * callback. If clear all the status simply, the external interrupts
184 * which happened between arch_suspend_disable_irqs and CIRQ suspend
185 * callback will be lost. Using following steps to avoid this issue;
186 *
187 * - Iterate over all the CIRQ supported interrupts;
188 * - For each interrupt, inspect its pending and masked status at GIC
189 * level;
190 * - If pending and unmasked, it happened between
191 * arch_suspend_disable_irqs and CIRQ suspend callback, don't ACK
192 * it. Otherwise, ACK it.
193 */
194 hwirq_num = cirq_data->ext_irq_end - cirq_data->ext_irq_start + 1;
195 for (i = 0; i < hwirq_num; i++) {
196 irq = irq_find_mapping(cirq_data->domain, i);
197 if (irq) {
198 pendret = irq_get_irqchip_state(irq,
199 IRQCHIP_STATE_PENDING,
200 &pending);
201
202 maskret = irq_get_irqchip_state(irq,
203 IRQCHIP_STATE_MASKED,
204 &masked);
205
206 if (pendret == 0 && maskret == 0 &&
207 (pending && !masked))
208 continue;
209 }
210
211 mask = 1 << (i % 32);
212 writel_relaxed(mask, cirq_data->base + CIRQ_ACK + (i / 32) * 4);
213 }
214
215 /* set edge_only mode, record edge-triggerd interrupts */
216 /* enable cirq */
217 value = readl_relaxed(cirq_data->base + CIRQ_CONTROL);
218 value |= (CIRQ_EDGE | CIRQ_EN);
219 writel_relaxed(value, cirq_data->base + CIRQ_CONTROL);
220
221 return 0;
222}
223
224static void mtk_cirq_resume(void)
225{
226 u32 value;
227
228 /* flush recored interrupts, will send signals to parent controller */
229 value = readl_relaxed(cirq_data->base + CIRQ_CONTROL);
230 writel_relaxed(value | CIRQ_FLUSH, cirq_data->base + CIRQ_CONTROL);
231
232 /* disable cirq */
233 value = readl_relaxed(cirq_data->base + CIRQ_CONTROL);
234 value &= ~(CIRQ_EDGE | CIRQ_EN);
235 writel_relaxed(value, cirq_data->base + CIRQ_CONTROL);
236}
237
238static struct syscore_ops mtk_cirq_syscore_ops = {
239 .suspend = mtk_cirq_suspend,
240 .resume = mtk_cirq_resume,
241};
242
243static void mtk_cirq_syscore_init(void)
244{
245 register_syscore_ops(&mtk_cirq_syscore_ops);
246}
247#else
248static inline void mtk_cirq_syscore_init(void) {}
249#endif
250
251static int __init mtk_cirq_of_init(struct device_node *node,
252 struct device_node *parent)
253{
254 struct irq_domain *domain, *domain_parent;
255 unsigned int irq_num;
256 int ret;
257
258 domain_parent = irq_find_host(parent);
259 if (!domain_parent) {
260 pr_err("mtk_cirq: interrupt-parent not found\n");
261 return -EINVAL;
262 }
263
264 cirq_data = kzalloc(sizeof(*cirq_data), GFP_KERNEL);
265 if (!cirq_data)
266 return -ENOMEM;
267
268 cirq_data->base = of_iomap(node, 0);
269 if (!cirq_data->base) {
270 pr_err("mtk_cirq: unable to map cirq register\n");
271 ret = -ENXIO;
272 goto out_free;
273 }
274
275 ret = of_property_read_u32_index(node, "mediatek,ext-irq-range", 0,
276 &cirq_data->ext_irq_start);
277 if (ret)
278 goto out_unmap;
279
280 ret = of_property_read_u32_index(node, "mediatek,ext-irq-range", 1,
281 &cirq_data->ext_irq_end);
282 if (ret)
283 goto out_unmap;
284
285 irq_num = cirq_data->ext_irq_end - cirq_data->ext_irq_start + 1;
286 domain = irq_domain_add_hierarchy(domain_parent, 0,
287 irq_num, node,
288 &cirq_domain_ops, cirq_data);
289 if (!domain) {
290 ret = -ENOMEM;
291 goto out_unmap;
292 }
293 cirq_data->domain = domain;
294
295 mtk_cirq_syscore_init();
296
297 return 0;
298
299out_unmap:
300 iounmap(cirq_data->base);
301out_free:
302 kfree(cirq_data);
303 return ret;
304}
305
306IRQCHIP_DECLARE(mtk_cirq, "mediatek,mtk-cirq", mtk_cirq_of_init);
307

Warning: That file was not part of the compilation database. It may have many parsing errors.