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1 | /* |
2 | * Arizona interrupt support |
3 | * |
4 | * Copyright 2012 Wolfson Microelectronics plc |
5 | * |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU General Public License version 2 as |
10 | * published by the Free Software Foundation. |
11 | */ |
12 | |
13 | #include <linux/delay.h> |
14 | #include <linux/gpio.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/irq.h> |
17 | #include <linux/irqdomain.h> |
18 | #include <linux/module.h> |
19 | #include <linux/pm_runtime.h> |
20 | #include <linux/regmap.h> |
21 | #include <linux/regulator/consumer.h> |
22 | #include <linux/slab.h> |
23 | |
24 | #include <linux/mfd/arizona/core.h> |
25 | #include <linux/mfd/arizona/registers.h> |
26 | |
27 | #include "arizona.h" |
28 | |
29 | static int arizona_map_irq(struct arizona *arizona, int irq) |
30 | { |
31 | int ret; |
32 | |
33 | ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq); |
34 | if (ret < 0) |
35 | ret = regmap_irq_get_virq(arizona->irq_chip, irq); |
36 | |
37 | return ret; |
38 | } |
39 | |
40 | int arizona_request_irq(struct arizona *arizona, int irq, char *name, |
41 | irq_handler_t handler, void *data) |
42 | { |
43 | irq = arizona_map_irq(arizona, irq); |
44 | if (irq < 0) |
45 | return irq; |
46 | |
47 | return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT, |
48 | name, data); |
49 | } |
50 | EXPORT_SYMBOL_GPL(arizona_request_irq); |
51 | |
52 | void arizona_free_irq(struct arizona *arizona, int irq, void *data) |
53 | { |
54 | irq = arizona_map_irq(arizona, irq); |
55 | if (irq < 0) |
56 | return; |
57 | |
58 | free_irq(irq, data); |
59 | } |
60 | EXPORT_SYMBOL_GPL(arizona_free_irq); |
61 | |
62 | int arizona_set_irq_wake(struct arizona *arizona, int irq, int on) |
63 | { |
64 | irq = arizona_map_irq(arizona, irq); |
65 | if (irq < 0) |
66 | return irq; |
67 | |
68 | return irq_set_irq_wake(irq, on); |
69 | } |
70 | EXPORT_SYMBOL_GPL(arizona_set_irq_wake); |
71 | |
72 | static irqreturn_t arizona_boot_done(int irq, void *data) |
73 | { |
74 | struct arizona *arizona = data; |
75 | |
76 | dev_dbg(arizona->dev, "Boot done\n"); |
77 | |
78 | return IRQ_HANDLED; |
79 | } |
80 | |
81 | static irqreturn_t arizona_ctrlif_err(int irq, void *data) |
82 | { |
83 | struct arizona *arizona = data; |
84 | |
85 | /* |
86 | * For pretty much all potential sources a register cache sync |
87 | * won't help, we've just got a software bug somewhere. |
88 | */ |
89 | dev_err(arizona->dev, "Control interface error\n"); |
90 | |
91 | return IRQ_HANDLED; |
92 | } |
93 | |
94 | static irqreturn_t arizona_irq_thread(int irq, void *data) |
95 | { |
96 | struct arizona *arizona = data; |
97 | unsigned int val; |
98 | int ret; |
99 | |
100 | ret = pm_runtime_get_sync(arizona->dev); |
101 | if (ret < 0) { |
102 | dev_err(arizona->dev, "Failed to resume device: %d\n", ret); |
103 | return IRQ_NONE; |
104 | } |
105 | |
106 | /* Always handle the AoD domain */ |
107 | handle_nested_irq(irq_find_mapping(arizona->virq, 0)); |
108 | |
109 | /* |
110 | * Check if one of the main interrupts is asserted and only |
111 | * check that domain if it is. |
112 | */ |
113 | ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, &val); |
114 | if (ret == 0 && val & ARIZONA_IRQ1_STS) { |
115 | handle_nested_irq(irq_find_mapping(arizona->virq, 1)); |
116 | } else if (ret != 0) { |
117 | dev_err(arizona->dev, "Failed to read main IRQ status: %d\n", |
118 | ret); |
119 | } |
120 | |
121 | pm_runtime_mark_last_busy(arizona->dev); |
122 | pm_runtime_put_autosuspend(arizona->dev); |
123 | |
124 | return IRQ_HANDLED; |
125 | } |
126 | |
127 | static void arizona_irq_enable(struct irq_data *data) |
128 | { |
129 | } |
130 | |
131 | static void arizona_irq_disable(struct irq_data *data) |
132 | { |
133 | } |
134 | |
135 | static struct irq_chip arizona_irq_chip = { |
136 | .name = "arizona", |
137 | .irq_disable = arizona_irq_disable, |
138 | .irq_enable = arizona_irq_enable, |
139 | }; |
140 | |
141 | static int arizona_irq_map(struct irq_domain *h, unsigned int virq, |
142 | irq_hw_number_t hw) |
143 | { |
144 | struct regmap_irq_chip_data *data = h->host_data; |
145 | |
146 | irq_set_chip_data(virq, data); |
147 | irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq); |
148 | irq_set_nested_thread(virq, 1); |
149 | |
150 | /* ARM needs us to explicitly flag the IRQ as valid |
151 | * and will set them noprobe when we do so. */ |
152 | #ifdef CONFIG_ARM |
153 | set_irq_flags(virq, IRQF_VALID); |
154 | #else |
155 | irq_set_noprobe(virq); |
156 | #endif |
157 | |
158 | return 0; |
159 | } |
160 | |
161 | static struct irq_domain_ops arizona_domain_ops = { |
162 | .map = arizona_irq_map, |
163 | .xlate = irq_domain_xlate_twocell, |
164 | }; |
165 | |
166 | int arizona_irq_init(struct arizona *arizona) |
167 | { |
168 | int flags = IRQF_ONESHOT; |
169 | int ret, i; |
170 | const struct regmap_irq_chip *aod, *irq; |
171 | bool ctrlif_error = true; |
172 | |
173 | switch (arizona->type) { |
174 | #ifdef CONFIG_MFD_WM5102 |
175 | case WM5102: |
176 | aod = &wm5102_aod; |
177 | irq = &wm5102_irq; |
178 | |
179 | ctrlif_error = false; |
180 | break; |
181 | #endif |
182 | #ifdef CONFIG_MFD_WM5110 |
183 | case WM5110: |
184 | aod = &wm5110_aod; |
185 | irq = &wm5110_irq; |
186 | |
187 | ctrlif_error = false; |
188 | break; |
189 | #endif |
190 | default: |
191 | BUG_ON("Unknown Arizona class device" == NULL); |
192 | return -EINVAL; |
193 | } |
194 | |
195 | if (arizona->pdata.irq_active_high) { |
196 | ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, |
197 | ARIZONA_IRQ_POL, 0); |
198 | if (ret != 0) { |
199 | dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", |
200 | ret); |
201 | goto err; |
202 | } |
203 | |
204 | flags |= IRQF_TRIGGER_HIGH; |
205 | } else { |
206 | flags |= IRQF_TRIGGER_LOW; |
207 | } |
208 | |
209 | /* Allocate a virtual IRQ domain to distribute to the regmap domains */ |
210 | arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops, |
211 | arizona); |
212 | if (!arizona->virq) { |
213 | dev_err(arizona->dev, "Failed to add core IRQ domain\n"); |
214 | ret = -EINVAL; |
215 | goto err; |
216 | } |
217 | |
218 | ret = regmap_add_irq_chip(arizona->regmap, |
219 | irq_create_mapping(arizona->virq, 0), |
220 | IRQF_ONESHOT, -1, aod, |
221 | &arizona->aod_irq_chip); |
222 | if (ret != 0) { |
223 | dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); |
224 | goto err_domain; |
225 | } |
226 | |
227 | ret = regmap_add_irq_chip(arizona->regmap, |
228 | irq_create_mapping(arizona->virq, 1), |
229 | IRQF_ONESHOT, -1, irq, |
230 | &arizona->irq_chip); |
231 | if (ret != 0) { |
232 | dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); |
233 | goto err_aod; |
234 | } |
235 | |
236 | /* Make sure the boot done IRQ is unmasked for resumes */ |
237 | i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE); |
238 | ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT, |
239 | "Boot done", arizona); |
240 | if (ret != 0) { |
241 | dev_err(arizona->dev, "Failed to request boot done %d: %d\n", |
242 | arizona->irq, ret); |
243 | goto err_boot_done; |
244 | } |
245 | |
246 | /* Handle control interface errors in the core */ |
247 | if (ctrlif_error) { |
248 | i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR); |
249 | ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, |
250 | IRQF_ONESHOT, |
251 | "Control interface error", arizona); |
252 | if (ret != 0) { |
253 | dev_err(arizona->dev, |
254 | "Failed to request CTRLIF_ERR %d: %d\n", |
255 | arizona->irq, ret); |
256 | goto err_ctrlif; |
257 | } |
258 | } |
259 | |
260 | ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, |
261 | flags, "arizona", arizona); |
262 | |
263 | if (ret != 0) { |
264 | dev_err(arizona->dev, "Failed to request IRQ %d: %d\n", |
265 | arizona->irq, ret); |
266 | goto err_main_irq; |
267 | } |
268 | |
269 | return 0; |
270 | |
271 | err_main_irq: |
272 | free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); |
273 | err_ctrlif: |
274 | free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); |
275 | err_boot_done: |
276 | regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), |
277 | arizona->irq_chip); |
278 | err_aod: |
279 | regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), |
280 | arizona->aod_irq_chip); |
281 | err_domain: |
282 | err: |
283 | return ret; |
284 | } |
285 | |
286 | int arizona_irq_exit(struct arizona *arizona) |
287 | { |
288 | free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); |
289 | free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); |
290 | regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), |
291 | arizona->irq_chip); |
292 | regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), |
293 | arizona->aod_irq_chip); |
294 | free_irq(arizona->irq, arizona); |
295 | |
296 | return 0; |
297 | } |
298 |
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