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9dbbbd33 YP |
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 | ||
39 | struct 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 | ||
46 | static struct mtk_cirq_chip_data *cirq_data; | |
47 | ||
48 | static 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 | ||
57 | static 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 | ||
63 | static 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 | ||
69 | static 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 | ||
99 | static 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 | ||
111 | static 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 | ||
137 | static 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 | ||
162 | static 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 | |
169 | static 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 | ||
224 | static 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 | ||
238 | static struct syscore_ops mtk_cirq_syscore_ops = { | |
239 | .suspend = mtk_cirq_suspend, | |
240 | .resume = mtk_cirq_resume, | |
241 | }; | |
242 | ||
243 | static void mtk_cirq_syscore_init(void) | |
244 | { | |
245 | register_syscore_ops(&mtk_cirq_syscore_ops); | |
246 | } | |
247 | #else | |
248 | static inline void mtk_cirq_syscore_init(void) {} | |
249 | #endif | |
250 | ||
251 | static 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 | ||
299 | out_unmap: | |
300 | iounmap(cirq_data->base); | |
301 | out_free: | |
302 | kfree(cirq_data); | |
303 | return ret; | |
304 | } | |
305 | ||
306 | IRQCHIP_DECLARE(mtk_cirq, "mediatek,mtk-cirq", mtk_cirq_of_init); |