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1/*
2 * max77686-irq.c - Interrupt controller support for MAX77686
3 *
4 * Copyright (C) 2012 Samsung Electronics Co.Ltd
5 * Chiwoong Byun <woong.byun@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * This driver is based on max8997-irq.c
22 */
23
24#include <linux/err.h>
25#include <linux/irq.h>
26#include <linux/interrupt.h>
27#include <linux/gpio.h>
28#include <linux/mfd/max77686.h>
29#include <linux/mfd/max77686-private.h>
30#include <linux/irqdomain.h>
31#include <linux/regmap.h>
32
33enum {
34 MAX77686_DEBUG_IRQ_INFO = 1 << 0,
35 MAX77686_DEBUG_IRQ_MASK = 1 << 1,
36 MAX77686_DEBUG_IRQ_INT = 1 << 2,
37};
38
39static int debug_mask = 0;
40module_param(debug_mask, int, 0);
41MODULE_PARM_DESC(debug_mask, "Set debug_mask : 0x0=off 0x1=IRQ_INFO 0x2=IRQ_MASK 0x4=IRQ_INI)");
42
43static const u8 max77686_mask_reg[] = {
44 [PMIC_INT1] = MAX77686_REG_INT1MSK,
45 [PMIC_INT2] = MAX77686_REG_INT2MSK,
46 [RTC_INT] = MAX77686_RTC_INTM,
47};
48
49static struct regmap *max77686_get_regmap(struct max77686_dev *max77686,
50 enum max77686_irq_source src)
51{
52 switch (src) {
53 case PMIC_INT1 ... PMIC_INT2:
54 return max77686->regmap;
55 case RTC_INT:
56 return max77686->rtc_regmap;
57 default:
58 return ERR_PTR(-EINVAL);
59 }
60}
61
62struct max77686_irq_data {
63 int mask;
64 enum max77686_irq_source group;
65};
66
67#define DECLARE_IRQ(idx, _group, _mask) \
68 [(idx)] = { .group = (_group), .mask = (_mask) }
69static const struct max77686_irq_data max77686_irqs[] = {
70 DECLARE_IRQ(MAX77686_PMICIRQ_PWRONF, PMIC_INT1, 1 << 0),
71 DECLARE_IRQ(MAX77686_PMICIRQ_PWRONR, PMIC_INT1, 1 << 1),
72 DECLARE_IRQ(MAX77686_PMICIRQ_JIGONBF, PMIC_INT1, 1 << 2),
73 DECLARE_IRQ(MAX77686_PMICIRQ_JIGONBR, PMIC_INT1, 1 << 3),
74 DECLARE_IRQ(MAX77686_PMICIRQ_ACOKBF, PMIC_INT1, 1 << 4),
75 DECLARE_IRQ(MAX77686_PMICIRQ_ACOKBR, PMIC_INT1, 1 << 5),
76 DECLARE_IRQ(MAX77686_PMICIRQ_ONKEY1S, PMIC_INT1, 1 << 6),
77 DECLARE_IRQ(MAX77686_PMICIRQ_MRSTB, PMIC_INT1, 1 << 7),
78 DECLARE_IRQ(MAX77686_PMICIRQ_140C, PMIC_INT2, 1 << 0),
79 DECLARE_IRQ(MAX77686_PMICIRQ_120C, PMIC_INT2, 1 << 1),
80 DECLARE_IRQ(MAX77686_RTCIRQ_RTC60S, RTC_INT, 1 << 0),
81 DECLARE_IRQ(MAX77686_RTCIRQ_RTCA1, RTC_INT, 1 << 1),
82 DECLARE_IRQ(MAX77686_RTCIRQ_RTCA2, RTC_INT, 1 << 2),
83 DECLARE_IRQ(MAX77686_RTCIRQ_SMPL, RTC_INT, 1 << 3),
84 DECLARE_IRQ(MAX77686_RTCIRQ_RTC1S, RTC_INT, 1 << 4),
85 DECLARE_IRQ(MAX77686_RTCIRQ_WTSR, RTC_INT, 1 << 5),
86};
87
88static void max77686_irq_lock(struct irq_data *data)
89{
90 struct max77686_dev *max77686 = irq_get_chip_data(data->irq);
91
92 if (debug_mask & MAX77686_DEBUG_IRQ_MASK)
93 pr_info("%s\n", __func__);
94
95 mutex_lock(&max77686->irqlock);
96}
97
98static void max77686_irq_sync_unlock(struct irq_data *data)
99{
100 struct max77686_dev *max77686 = irq_get_chip_data(data->irq);
101 int i;
102
103 for (i = 0; i < MAX77686_IRQ_GROUP_NR; i++) {
104 u8 mask_reg = max77686_mask_reg[i];
105 struct regmap *map = max77686_get_regmap(max77686, i);
106
107 if (debug_mask & MAX77686_DEBUG_IRQ_MASK)
108 pr_debug("%s: mask_reg[%d]=0x%x, cur=0x%x\n",
109 __func__, i, mask_reg, max77686->irq_masks_cur[i]);
110
111 if (mask_reg == MAX77686_REG_INVALID ||
112 IS_ERR_OR_NULL(map))
113 continue;
114
115 max77686->irq_masks_cache[i] = max77686->irq_masks_cur[i];
116
117 regmap_write(map, max77686_mask_reg[i],
118 max77686->irq_masks_cur[i]);
119 }
120
121 mutex_unlock(&max77686->irqlock);
122}
123
124static const inline struct max77686_irq_data *to_max77686_irq(int irq)
125{
126 struct irq_data *data = irq_get_irq_data(irq);
127 return &max77686_irqs[data->hwirq];
128}
129
130static void max77686_irq_mask(struct irq_data *data)
131{
132 struct max77686_dev *max77686 = irq_get_chip_data(data->irq);
133 const struct max77686_irq_data *irq_data = to_max77686_irq(data->irq);
134
135 max77686->irq_masks_cur[irq_data->group] |= irq_data->mask;
136
137 if (debug_mask & MAX77686_DEBUG_IRQ_MASK)
138 pr_info("%s: group=%d, cur=0x%x\n",
139 __func__, irq_data->group,
140 max77686->irq_masks_cur[irq_data->group]);
141}
142
143static void max77686_irq_unmask(struct irq_data *data)
144{
145 struct max77686_dev *max77686 = irq_get_chip_data(data->irq);
146 const struct max77686_irq_data *irq_data = to_max77686_irq(data->irq);
147
148 max77686->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
149
150 if (debug_mask & MAX77686_DEBUG_IRQ_MASK)
151 pr_info("%s: group=%d, cur=0x%x\n",
152 __func__, irq_data->group,
153 max77686->irq_masks_cur[irq_data->group]);
154}
155
156static struct irq_chip max77686_irq_chip = {
157 .name = "max77686",
158 .irq_bus_lock = max77686_irq_lock,
159 .irq_bus_sync_unlock = max77686_irq_sync_unlock,
160 .irq_mask = max77686_irq_mask,
161 .irq_unmask = max77686_irq_unmask,
162};
163
164static irqreturn_t max77686_irq_thread(int irq, void *data)
165{
166 struct max77686_dev *max77686 = data;
167 unsigned int irq_reg[MAX77686_IRQ_GROUP_NR] = {};
168 unsigned int irq_src;
169 int ret;
170 int i, cur_irq;
171
172 ret = regmap_read(max77686->regmap, MAX77686_REG_INTSRC, &irq_src);
173 if (ret < 0) {
174 dev_err(max77686->dev, "Failed to read interrupt source: %d\n",
175 ret);
176 return IRQ_NONE;
177 }
178
179 if (debug_mask & MAX77686_DEBUG_IRQ_INT)
180 pr_info("%s: irq_src=0x%x\n", __func__, irq_src);
181
182 if (irq_src == MAX77686_IRQSRC_PMIC) {
183 ret = regmap_bulk_read(max77686->regmap,
184 MAX77686_REG_INT1, irq_reg, 2);
185 if (ret < 0) {
186 dev_err(max77686->dev, "Failed to read interrupt source: %d\n",
187 ret);
188 return IRQ_NONE;
189 }
190
191 if (debug_mask & MAX77686_DEBUG_IRQ_INT)
192 pr_info("%s: int1=0x%x, int2=0x%x\n", __func__,
193 irq_reg[PMIC_INT1], irq_reg[PMIC_INT2]);
194 }
195
196 if (irq_src & MAX77686_IRQSRC_RTC) {
197 ret = regmap_read(max77686->rtc_regmap,
198 MAX77686_RTC_INT, &irq_reg[RTC_INT]);
199 if (ret < 0) {
200 dev_err(max77686->dev, "Failed to read interrupt source: %d\n",
201 ret);
202 return IRQ_NONE;
203 }
204
205 if (debug_mask & MAX77686_DEBUG_IRQ_INT)
206 pr_info("%s: rtc int=0x%x\n", __func__,
207 irq_reg[RTC_INT]);
208
209 }
210
211 for (i = 0; i < MAX77686_IRQ_GROUP_NR; i++)
212 irq_reg[i] &= ~max77686->irq_masks_cur[i];
213
214 for (i = 0; i < MAX77686_IRQ_NR; i++) {
215 if (irq_reg[max77686_irqs[i].group] & max77686_irqs[i].mask) {
216 cur_irq = irq_find_mapping(max77686->irq_domain, i);
217 if (cur_irq)
218 handle_nested_irq(cur_irq);
219 }
220 }
221
222 return IRQ_HANDLED;
223}
224
225static int max77686_irq_domain_map(struct irq_domain *d, unsigned int irq,
226 irq_hw_number_t hw)
227{
228 struct max77686_dev *max77686 = d->host_data;
229
230 irq_set_chip_data(irq, max77686);
231 irq_set_chip_and_handler(irq, &max77686_irq_chip, handle_edge_irq);
232 irq_set_nested_thread(irq, 1);
233#ifdef CONFIG_ARM
234 set_irq_flags(irq, IRQF_VALID);
235#else
236 irq_set_noprobe(irq);
237#endif
238 return 0;
239}
240
241static struct irq_domain_ops max77686_irq_domain_ops = {
242 .map = max77686_irq_domain_map,
243};
244
245int max77686_irq_init(struct max77686_dev *max77686)
246{
247 struct irq_domain *domain;
248 int i;
249 int ret;
250 int val;
251 struct regmap *map;
252
253 mutex_init(&max77686->irqlock);
254
255 if (max77686->irq_gpio && !max77686->irq) {
256 max77686->irq = gpio_to_irq(max77686->irq_gpio);
257
258 if (debug_mask & MAX77686_DEBUG_IRQ_INT) {
259 ret = gpio_request(max77686->irq_gpio, "pmic_irq");
260 if (ret < 0) {
261 dev_err(max77686->dev,
262 "Failed to request gpio %d with ret:"
263 "%d\n", max77686->irq_gpio, ret);
264 return IRQ_NONE;
265 }
266
267 gpio_direction_input(max77686->irq_gpio);
268 val = gpio_get_value(max77686->irq_gpio);
269 gpio_free(max77686->irq_gpio);
270 pr_info("%s: gpio_irq=%x\n", __func__, val);
271 }
272 }
273
274 if (!max77686->irq) {
275 dev_err(max77686->dev, "irq is not specified\n");
276 return -ENODEV;
277 }
278
279 /* Mask individual interrupt sources */
280 for (i = 0; i < MAX77686_IRQ_GROUP_NR; i++) {
281 max77686->irq_masks_cur[i] = 0xff;
282 max77686->irq_masks_cache[i] = 0xff;
283 map = max77686_get_regmap(max77686, i);
284
285 if (IS_ERR_OR_NULL(map))
286 continue;
287 if (max77686_mask_reg[i] == MAX77686_REG_INVALID)
288 continue;
289
290 regmap_write(map, max77686_mask_reg[i], 0xff);
291 }
292 domain = irq_domain_add_linear(NULL, MAX77686_IRQ_NR,
293 &max77686_irq_domain_ops, max77686);
294 if (!domain) {
295 dev_err(max77686->dev, "could not create irq domain\n");
296 return -ENODEV;
297 }
298 max77686->irq_domain = domain;
299
300 ret = request_threaded_irq(max77686->irq, NULL, max77686_irq_thread,
301 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
302 "max77686-irq", max77686);
303
304 if (ret)
305 dev_err(max77686->dev, "Failed to request IRQ %d: %d\n",
306 max77686->irq, ret);
307
308
309 if (debug_mask & MAX77686_DEBUG_IRQ_INFO)
310 pr_info("%s-\n", __func__);
311
312 return 0;
313}
314
315void max77686_irq_exit(struct max77686_dev *max77686)
316{
317 if (max77686->irq)
318 free_irq(max77686->irq, max77686);
319}