tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/mfd/mt6323/core.h>
13#include <linux/mfd/mt6323/registers.h>
14#include <linux/mfd/mt6397/core.h>
15#include <linux/mfd/mt6397/registers.h>
16
17static void mt6397_irq_lock(struct irq_data *data)
18{
19 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
20
21 mutex_lock(&mt6397->irqlock);
22}
23
24static void mt6397_irq_sync_unlock(struct irq_data *data)
25{
26 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
27
28 regmap_write(mt6397->regmap, mt6397->int_con[0],
29 mt6397->irq_masks_cur[0]);
30 regmap_write(mt6397->regmap, mt6397->int_con[1],
31 mt6397->irq_masks_cur[1]);
32
33 mutex_unlock(&mt6397->irqlock);
34}
35
36static void mt6397_irq_disable(struct irq_data *data)
37{
38 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
39 int shift = data->hwirq & 0xf;
40 int reg = data->hwirq >> 4;
41
42 mt6397->irq_masks_cur[reg] &= ~BIT(shift);
43}
44
45static void mt6397_irq_enable(struct irq_data *data)
46{
47 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data);
48 int shift = data->hwirq & 0xf;
49 int reg = data->hwirq >> 4;
50
51 mt6397->irq_masks_cur[reg] |= BIT(shift);
52}
53
54#ifdef CONFIG_PM_SLEEP
55static int mt6397_irq_set_wake(struct irq_data *irq_data, unsigned int on)
56{
57 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(irq_data);
58 int shift = irq_data->hwirq & 0xf;
59 int reg = irq_data->hwirq >> 4;
60
61 if (on)
62 mt6397->wake_mask[reg] |= BIT(shift);
63 else
64 mt6397->wake_mask[reg] &= ~BIT(shift);
65
66 return 0;
67}
68#else
69#define mt6397_irq_set_wake NULL
70#endif
71
72static struct irq_chip mt6397_irq_chip = {
73 .name = "mt6397-irq",
74 .irq_bus_lock = mt6397_irq_lock,
75 .irq_bus_sync_unlock = mt6397_irq_sync_unlock,
76 .irq_enable = mt6397_irq_enable,
77 .irq_disable = mt6397_irq_disable,
78 .irq_set_wake = mt6397_irq_set_wake,
79};
80
81static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
82 int irqbase)
83{
84 unsigned int status;
85 int i, irq, ret;
86
87 ret = regmap_read(mt6397->regmap, reg, &status);
88 if (ret) {
89 dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret);
90 return;
91 }
92
93 for (i = 0; i < 16; i++) {
94 if (status & BIT(i)) {
95 irq = irq_find_mapping(mt6397->irq_domain, irqbase + i);
96 if (irq)
97 handle_nested_irq(irq);
98 }
99 }
100
101 regmap_write(mt6397->regmap, reg, status);
102}
103
104static irqreturn_t mt6397_irq_thread(int irq, void *data)
105{
106 struct mt6397_chip *mt6397 = data;
107
108 mt6397_irq_handle_reg(mt6397, mt6397->int_status[0], 0);
109 mt6397_irq_handle_reg(mt6397, mt6397->int_status[1], 16);
110
111 return IRQ_HANDLED;
112}
113
114static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq,
115 irq_hw_number_t hw)
116{
117 struct mt6397_chip *mt6397 = d->host_data;
118
119 irq_set_chip_data(irq, mt6397);
120 irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq);
121 irq_set_nested_thread(irq, 1);
122 irq_set_noprobe(irq);
123
124 return 0;
125}
126
127static const struct irq_domain_ops mt6397_irq_domain_ops = {
128 .map = mt6397_irq_domain_map,
129};
130
131int mt6397_irq_init(struct mt6397_chip *chip)
132{
133 int ret;
134
135 mutex_init(&chip->irqlock);
136
137 switch (chip->chip_id) {
138 case MT6323_CHIP_ID:
139 chip->int_con[0] = MT6323_INT_CON0;
140 chip->int_con[1] = MT6323_INT_CON1;
141 chip->int_status[0] = MT6323_INT_STATUS0;
142 chip->int_status[1] = MT6323_INT_STATUS1;
143 break;
144
145 case MT6391_CHIP_ID:
146 case MT6397_CHIP_ID:
147 chip->int_con[0] = MT6397_INT_CON0;
148 chip->int_con[1] = MT6397_INT_CON1;
149 chip->int_status[0] = MT6397_INT_STATUS0;
150 chip->int_status[1] = MT6397_INT_STATUS1;
151 break;
152
153 default:
154 dev_err(chip->dev, "unsupported chip: 0x%x\n", chip->chip_id);
155 return -ENODEV;
156 }
157
158 /* Mask all interrupt sources */
159 regmap_write(chip->regmap, chip->int_con[0], 0x0);
160 regmap_write(chip->regmap, chip->int_con[1], 0x0);
161
162 chip->irq_domain = irq_domain_add_linear(chip->dev->of_node,
163 MT6397_IRQ_NR,
164 &mt6397_irq_domain_ops,
165 chip);
166 if (!chip->irq_domain) {
167 dev_err(chip->dev, "could not create irq domain\n");
168 return -ENOMEM;
169 }
170
171 ret = devm_request_threaded_irq(chip->dev, chip->irq, NULL,
172 mt6397_irq_thread, IRQF_ONESHOT,
173 "mt6397-pmic", chip);
174 if (ret) {
175 dev_err(chip->dev, "failed to register irq=%d; err: %d\n",
176 chip->irq, ret);
177 return ret;
178 }
179
180 return 0;
181}