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966cdc96 MB |
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; | |
3080de4e | 97 | unsigned int val; |
cdabc1c8 | 98 | int ret; |
966cdc96 MB |
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 | ||
3080de4e MB |
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 | } | |
966cdc96 MB |
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; | |
92d80139 | 171 | bool ctrlif_error = true; |
966cdc96 MB |
172 | |
173 | switch (arizona->type) { | |
863df8d5 | 174 | #ifdef CONFIG_MFD_WM5102 |
966cdc96 MB |
175 | case WM5102: |
176 | aod = &wm5102_aod; | |
177 | irq = &wm5102_irq; | |
92d80139 MB |
178 | |
179 | switch (arizona->rev) { | |
180 | case 0: | |
944b0582 | 181 | case 1: |
92d80139 MB |
182 | ctrlif_error = false; |
183 | break; | |
184 | default: | |
185 | break; | |
186 | } | |
966cdc96 | 187 | break; |
e102befe MB |
188 | #endif |
189 | #ifdef CONFIG_MFD_WM5110 | |
190 | case WM5110: | |
191 | aod = &wm5110_aod; | |
192 | irq = &wm5110_irq; | |
92d80139 MB |
193 | |
194 | switch (arizona->rev) { | |
195 | case 0: | |
46ae368b | 196 | case 1: |
92d80139 MB |
197 | ctrlif_error = false; |
198 | break; | |
199 | default: | |
200 | break; | |
201 | } | |
e102befe | 202 | break; |
863df8d5 | 203 | #endif |
966cdc96 MB |
204 | default: |
205 | BUG_ON("Unknown Arizona class device" == NULL); | |
206 | return -EINVAL; | |
207 | } | |
208 | ||
209 | if (arizona->pdata.irq_active_high) { | |
210 | ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, | |
211 | ARIZONA_IRQ_POL, 0); | |
212 | if (ret != 0) { | |
213 | dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", | |
214 | ret); | |
215 | goto err; | |
216 | } | |
217 | ||
218 | flags |= IRQF_TRIGGER_HIGH; | |
219 | } else { | |
220 | flags |= IRQF_TRIGGER_LOW; | |
221 | } | |
222 | ||
223 | /* Allocate a virtual IRQ domain to distribute to the regmap domains */ | |
224 | arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops, | |
225 | arizona); | |
226 | if (!arizona->virq) { | |
b7dea5dc | 227 | dev_err(arizona->dev, "Failed to add core IRQ domain\n"); |
966cdc96 MB |
228 | ret = -EINVAL; |
229 | goto err; | |
230 | } | |
231 | ||
232 | ret = regmap_add_irq_chip(arizona->regmap, | |
233 | irq_create_mapping(arizona->virq, 0), | |
234 | IRQF_ONESHOT, -1, aod, | |
235 | &arizona->aod_irq_chip); | |
236 | if (ret != 0) { | |
237 | dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); | |
238 | goto err_domain; | |
239 | } | |
240 | ||
241 | ret = regmap_add_irq_chip(arizona->regmap, | |
242 | irq_create_mapping(arizona->virq, 1), | |
243 | IRQF_ONESHOT, -1, irq, | |
244 | &arizona->irq_chip); | |
245 | if (ret != 0) { | |
246 | dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); | |
247 | goto err_aod; | |
248 | } | |
249 | ||
250 | /* Make sure the boot done IRQ is unmasked for resumes */ | |
251 | i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE); | |
252 | ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT, | |
253 | "Boot done", arizona); | |
254 | if (ret != 0) { | |
255 | dev_err(arizona->dev, "Failed to request boot done %d: %d\n", | |
256 | arizona->irq, ret); | |
257 | goto err_boot_done; | |
258 | } | |
259 | ||
260 | /* Handle control interface errors in the core */ | |
92d80139 MB |
261 | if (ctrlif_error) { |
262 | i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR); | |
263 | ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, | |
264 | IRQF_ONESHOT, | |
265 | "Control interface error", arizona); | |
266 | if (ret != 0) { | |
267 | dev_err(arizona->dev, | |
268 | "Failed to request CTRLIF_ERR %d: %d\n", | |
269 | arizona->irq, ret); | |
270 | goto err_ctrlif; | |
271 | } | |
966cdc96 MB |
272 | } |
273 | ||
274 | ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, | |
275 | flags, "arizona", arizona); | |
276 | ||
277 | if (ret != 0) { | |
278 | dev_err(arizona->dev, "Failed to request IRQ %d: %d\n", | |
279 | arizona->irq, ret); | |
280 | goto err_main_irq; | |
281 | } | |
282 | ||
283 | return 0; | |
284 | ||
285 | err_main_irq: | |
286 | free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); | |
287 | err_ctrlif: | |
288 | free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); | |
289 | err_boot_done: | |
290 | regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), | |
291 | arizona->irq_chip); | |
292 | err_aod: | |
293 | regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), | |
294 | arizona->aod_irq_chip); | |
295 | err_domain: | |
296 | err: | |
297 | return ret; | |
298 | } | |
299 | ||
300 | int arizona_irq_exit(struct arizona *arizona) | |
301 | { | |
302 | free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); | |
303 | free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); | |
304 | regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), | |
305 | arizona->irq_chip); | |
306 | regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), | |
307 | arizona->aod_irq_chip); | |
308 | free_irq(arizona->irq, arizona); | |
309 | ||
310 | return 0; | |
311 | } |