1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2019 MediaTek Inc.
4
5 #include <linux/interrupt.h>
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/of_device.h>
9 #include <linux/of_irq.h>
10 #include <linux/platform_device.h>
11 #include <linux/regmap.h>
12 #include <linux/suspend.h>
13 #include <linux/mfd/mt6323/core.h>
14 #include <linux/mfd/mt6323/registers.h>
15 #include <linux/mfd/mt6331/core.h>
16 #include <linux/mfd/mt6331/registers.h>
17 #include <linux/mfd/mt6397/core.h>
18 #include <linux/mfd/mt6397/registers.h>
19
mt6397_irq_lock(struct irq_data * data)20 static void mt6397_irq_lock(struct irq_data *data)
21 {
22 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
23
24 mutex_lock(&mt6397->irqlock);
25 }
26
mt6397_irq_sync_unlock(struct irq_data * data)27 static void mt6397_irq_sync_unlock(struct irq_data *data)
28 {
29 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
30
31 regmap_write(mt6397->regmap, mt6397->int_con[0],
32 mt6397->irq_masks_cur[0]);
33 regmap_write(mt6397->regmap, mt6397->int_con[1],
34 mt6397->irq_masks_cur[1]);
35
36 mutex_unlock(&mt6397->irqlock);
37 }
38
mt6397_irq_disable(struct irq_data * data)39 static void mt6397_irq_disable(struct irq_data *data)
40 {
41 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
42 int shift = data->hwirq & 0xf;
43 int reg = data->hwirq >> 4;
44
45 mt6397->irq_masks_cur[reg] &= ~BIT(shift);
46 }
47
mt6397_irq_enable(struct irq_data * data)48 static void mt6397_irq_enable(struct irq_data *data)
49 {
50 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
51 int shift = data->hwirq & 0xf;
52 int reg = data->hwirq >> 4;
53
54 mt6397->irq_masks_cur[reg] |= BIT(shift);
55 }
56
mt6397_irq_set_wake(struct irq_data * irq_data,unsigned int on)57 static int mt6397_irq_set_wake(struct irq_data *irq_data, unsigned int on)
58 {
59 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(irq_data);
60 int shift = irq_data->hwirq & 0xf;
61 int reg = irq_data->hwirq >> 4;
62
63 if (on)
64 mt6397->wake_mask[reg] |= BIT(shift);
65 else
66 mt6397->wake_mask[reg] &= ~BIT(shift);
67
68 return 0;
69 }
70
71 static struct irq_chip mt6397_irq_chip = {
72 .name = "mt6397-irq",
73 .irq_bus_lock = mt6397_irq_lock,
74 .irq_bus_sync_unlock = mt6397_irq_sync_unlock,
75 .irq_enable = mt6397_irq_enable,
76 .irq_disable = mt6397_irq_disable,
77 .irq_set_wake = pm_sleep_ptr(mt6397_irq_set_wake),
78 };
79
mt6397_irq_handle_reg(struct mt6397_chip * mt6397,int reg,int irqbase)80 static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
81 int irqbase)
82 {
83 unsigned int status = 0;
84 int i, irq, ret;
85
86 ret = regmap_read(mt6397->regmap, reg, &status);
87 if (ret) {
88 dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret);
89 return;
90 }
91
92 for (i = 0; i < 16; i++) {
93 if (status & BIT(i)) {
94 irq = irq_find_mapping(mt6397->irq_domain, irqbase + i);
95 if (irq)
96 handle_nested_irq(irq);
97 }
98 }
99
100 regmap_write(mt6397->regmap, reg, status);
101 }
102
mt6397_irq_thread(int irq,void * data)103 static irqreturn_t mt6397_irq_thread(int irq, void *data)
104 {
105 struct mt6397_chip *mt6397 = data;
106
107 mt6397_irq_handle_reg(mt6397, mt6397->int_status[0], 0);
108 mt6397_irq_handle_reg(mt6397, mt6397->int_status[1], 16);
109
110 return IRQ_HANDLED;
111 }
112
mt6397_irq_domain_map(struct irq_domain * d,unsigned int irq,irq_hw_number_t hw)113 static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq,
114 irq_hw_number_t hw)
115 {
116 struct mt6397_chip *mt6397 = d->host_data;
117
118 irq_set_chip_data(irq, mt6397);
119 irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq);
120 irq_set_nested_thread(irq, 1);
121 irq_set_noprobe(irq);
122
123 return 0;
124 }
125
126 static const struct irq_domain_ops mt6397_irq_domain_ops = {
127 .map = mt6397_irq_domain_map,
128 };
129
mt6397_irq_pm_notifier(struct notifier_block * notifier,unsigned long pm_event,void * unused)130 static int mt6397_irq_pm_notifier(struct notifier_block *notifier,
131 unsigned long pm_event, void *unused)
132 {
133 struct mt6397_chip *chip =
134 container_of(notifier, struct mt6397_chip, pm_nb);
135
136 switch (pm_event) {
137 case PM_SUSPEND_PREPARE:
138 regmap_write(chip->regmap,
139 chip->int_con[0], chip->wake_mask[0]);
140 regmap_write(chip->regmap,
141 chip->int_con[1], chip->wake_mask[1]);
142 enable_irq_wake(chip->irq);
143 break;
144
145 case PM_POST_SUSPEND:
146 regmap_write(chip->regmap,
147 chip->int_con[0], chip->irq_masks_cur[0]);
148 regmap_write(chip->regmap,
149 chip->int_con[1], chip->irq_masks_cur[1]);
150 disable_irq_wake(chip->irq);
151 break;
152
153 default:
154 break;
155 }
156
157 return NOTIFY_DONE;
158 }
159
mt6397_irq_init(struct mt6397_chip * chip)160 int mt6397_irq_init(struct mt6397_chip *chip)
161 {
162 int ret;
163
164 mutex_init(&chip->irqlock);
165
166 switch (chip->chip_id) {
167 case MT6323_CHIP_ID:
168 chip->int_con[0] = MT6323_INT_CON0;
169 chip->int_con[1] = MT6323_INT_CON1;
170 chip->int_status[0] = MT6323_INT_STATUS0;
171 chip->int_status[1] = MT6323_INT_STATUS1;
172 break;
173 case MT6331_CHIP_ID:
174 chip->int_con[0] = MT6331_INT_CON0;
175 chip->int_con[1] = MT6331_INT_CON1;
176 chip->int_status[0] = MT6331_INT_STATUS_CON0;
177 chip->int_status[1] = MT6331_INT_STATUS_CON1;
178 break;
179 case MT6391_CHIP_ID:
180 case MT6397_CHIP_ID:
181 chip->int_con[0] = MT6397_INT_CON0;
182 chip->int_con[1] = MT6397_INT_CON1;
183 chip->int_status[0] = MT6397_INT_STATUS0;
184 chip->int_status[1] = MT6397_INT_STATUS1;
185 break;
186
187 default:
188 dev_err(chip->dev, "unsupported chip: 0x%x\n", chip->chip_id);
189 return -ENODEV;
190 }
191
192 /* Mask all interrupt sources */
193 regmap_write(chip->regmap, chip->int_con[0], 0x0);
194 regmap_write(chip->regmap, chip->int_con[1], 0x0);
195
196 chip->pm_nb.notifier_call = mt6397_irq_pm_notifier;
197 chip->irq_domain = irq_domain_add_linear(chip->dev->of_node,
198 MT6397_IRQ_NR,
199 &mt6397_irq_domain_ops,
200 chip);
201 if (!chip->irq_domain) {
202 dev_err(chip->dev, "could not create irq domain\n");
203 return -ENOMEM;
204 }
205
206 ret = devm_request_threaded_irq(chip->dev, chip->irq, NULL,
207 mt6397_irq_thread, IRQF_ONESHOT,
208 "mt6397-pmic", chip);
209 if (ret) {
210 dev_err(chip->dev, "failed to register irq=%d; err: %d\n",
211 chip->irq, ret);
212 return ret;
213 }
214
215 register_pm_notifier(&chip->pm_nb);
216 return 0;
217 }
218