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