1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2021, The Linux Foundation. All rights reserved.
4 */
5
6 #include <linux/bitops.h>
7 #include <linux/i2c.h>
8 #include <linux/interrupt.h>
9 #include <linux/irq.h>
10 #include <linux/irqdomain.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_platform.h>
14 #include <linux/pinctrl/consumer.h>
15 #include <linux/regmap.h>
16 #include <linux/slab.h>
17
18 #include <dt-bindings/mfd/qcom-pm8008.h>
19
20 #define I2C_INTR_STATUS_BASE 0x0550
21 #define INT_RT_STS_OFFSET 0x10
22 #define INT_SET_TYPE_OFFSET 0x11
23 #define INT_POL_HIGH_OFFSET 0x12
24 #define INT_POL_LOW_OFFSET 0x13
25 #define INT_LATCHED_CLR_OFFSET 0x14
26 #define INT_EN_SET_OFFSET 0x15
27 #define INT_EN_CLR_OFFSET 0x16
28 #define INT_LATCHED_STS_OFFSET 0x18
29
30 enum {
31 PM8008_MISC,
32 PM8008_TEMP_ALARM,
33 PM8008_GPIO1,
34 PM8008_GPIO2,
35 PM8008_NUM_PERIPHS,
36 };
37
38 #define PM8008_PERIPH_0_BASE 0x900
39 #define PM8008_PERIPH_1_BASE 0x2400
40 #define PM8008_PERIPH_2_BASE 0xC000
41 #define PM8008_PERIPH_3_BASE 0xC100
42
43 #define PM8008_TEMP_ALARM_ADDR PM8008_PERIPH_1_BASE
44 #define PM8008_GPIO1_ADDR PM8008_PERIPH_2_BASE
45 #define PM8008_GPIO2_ADDR PM8008_PERIPH_3_BASE
46
47 enum {
48 SET_TYPE_INDEX,
49 POLARITY_HI_INDEX,
50 POLARITY_LO_INDEX,
51 };
52
53 static unsigned int pm8008_config_regs[] = {
54 INT_SET_TYPE_OFFSET,
55 INT_POL_HIGH_OFFSET,
56 INT_POL_LOW_OFFSET,
57 };
58
59 static struct regmap_irq pm8008_irqs[] = {
60 REGMAP_IRQ_REG(PM8008_IRQ_MISC_UVLO, PM8008_MISC, BIT(0)),
61 REGMAP_IRQ_REG(PM8008_IRQ_MISC_OVLO, PM8008_MISC, BIT(1)),
62 REGMAP_IRQ_REG(PM8008_IRQ_MISC_OTST2, PM8008_MISC, BIT(2)),
63 REGMAP_IRQ_REG(PM8008_IRQ_MISC_OTST3, PM8008_MISC, BIT(3)),
64 REGMAP_IRQ_REG(PM8008_IRQ_MISC_LDO_OCP, PM8008_MISC, BIT(4)),
65 REGMAP_IRQ_REG(PM8008_IRQ_TEMP_ALARM, PM8008_TEMP_ALARM, BIT(0)),
66 REGMAP_IRQ_REG(PM8008_IRQ_GPIO1, PM8008_GPIO1, BIT(0)),
67 REGMAP_IRQ_REG(PM8008_IRQ_GPIO2, PM8008_GPIO2, BIT(0)),
68 };
69
70 static const unsigned int pm8008_periph_base[] = {
71 PM8008_PERIPH_0_BASE,
72 PM8008_PERIPH_1_BASE,
73 PM8008_PERIPH_2_BASE,
74 PM8008_PERIPH_3_BASE,
75 };
76
pm8008_get_irq_reg(struct regmap_irq_chip_data * data,unsigned int base,int index)77 static unsigned int pm8008_get_irq_reg(struct regmap_irq_chip_data *data,
78 unsigned int base, int index)
79 {
80 /* Simple linear addressing for the main status register */
81 if (base == I2C_INTR_STATUS_BASE)
82 return base + index;
83
84 return pm8008_periph_base[index] + base;
85 }
86
pm8008_set_type_config(unsigned int ** buf,unsigned int type,const struct regmap_irq * irq_data,int idx,void * irq_drv_data)87 static int pm8008_set_type_config(unsigned int **buf, unsigned int type,
88 const struct regmap_irq *irq_data, int idx,
89 void *irq_drv_data)
90 {
91 switch (type) {
92 case IRQ_TYPE_EDGE_FALLING:
93 case IRQ_TYPE_LEVEL_LOW:
94 buf[POLARITY_HI_INDEX][idx] &= ~irq_data->mask;
95 buf[POLARITY_LO_INDEX][idx] |= irq_data->mask;
96 break;
97
98 case IRQ_TYPE_EDGE_RISING:
99 case IRQ_TYPE_LEVEL_HIGH:
100 buf[POLARITY_HI_INDEX][idx] |= irq_data->mask;
101 buf[POLARITY_LO_INDEX][idx] &= ~irq_data->mask;
102 break;
103
104 case IRQ_TYPE_EDGE_BOTH:
105 buf[POLARITY_HI_INDEX][idx] |= irq_data->mask;
106 buf[POLARITY_LO_INDEX][idx] |= irq_data->mask;
107 break;
108
109 default:
110 return -EINVAL;
111 }
112
113 if (type & IRQ_TYPE_EDGE_BOTH)
114 buf[SET_TYPE_INDEX][idx] |= irq_data->mask;
115 else
116 buf[SET_TYPE_INDEX][idx] &= ~irq_data->mask;
117
118 return 0;
119 }
120
121 static struct regmap_irq_chip pm8008_irq_chip = {
122 .name = "pm8008_irq",
123 .main_status = I2C_INTR_STATUS_BASE,
124 .num_main_regs = 1,
125 .irqs = pm8008_irqs,
126 .num_irqs = ARRAY_SIZE(pm8008_irqs),
127 .num_regs = PM8008_NUM_PERIPHS,
128 .status_base = INT_LATCHED_STS_OFFSET,
129 .mask_base = INT_EN_CLR_OFFSET,
130 .unmask_base = INT_EN_SET_OFFSET,
131 .mask_unmask_non_inverted = true,
132 .ack_base = INT_LATCHED_CLR_OFFSET,
133 .config_base = pm8008_config_regs,
134 .num_config_bases = ARRAY_SIZE(pm8008_config_regs),
135 .num_config_regs = PM8008_NUM_PERIPHS,
136 .set_type_config = pm8008_set_type_config,
137 .get_irq_reg = pm8008_get_irq_reg,
138 };
139
140 static struct regmap_config qcom_mfd_regmap_cfg = {
141 .reg_bits = 16,
142 .val_bits = 8,
143 .max_register = 0xFFFF,
144 };
145
pm8008_probe_irq_peripherals(struct device * dev,struct regmap * regmap,int client_irq)146 static int pm8008_probe_irq_peripherals(struct device *dev,
147 struct regmap *regmap,
148 int client_irq)
149 {
150 int rc, i;
151 struct regmap_irq_type *type;
152 struct regmap_irq_chip_data *irq_data;
153
154 for (i = 0; i < ARRAY_SIZE(pm8008_irqs); i++) {
155 type = &pm8008_irqs[i].type;
156
157 type->type_reg_offset = pm8008_irqs[i].reg_offset;
158
159 if (type->type_reg_offset == PM8008_MISC)
160 type->types_supported = IRQ_TYPE_EDGE_RISING;
161 else
162 type->types_supported = (IRQ_TYPE_EDGE_BOTH |
163 IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW);
164 }
165
166 rc = devm_regmap_add_irq_chip(dev, regmap, client_irq,
167 IRQF_SHARED, 0, &pm8008_irq_chip, &irq_data);
168 if (rc) {
169 dev_err(dev, "Failed to add IRQ chip: %d\n", rc);
170 return rc;
171 }
172
173 return 0;
174 }
175
pm8008_probe(struct i2c_client * client)176 static int pm8008_probe(struct i2c_client *client)
177 {
178 int rc;
179 struct device *dev;
180 struct regmap *regmap;
181
182 dev = &client->dev;
183 regmap = devm_regmap_init_i2c(client, &qcom_mfd_regmap_cfg);
184 if (IS_ERR(regmap))
185 return PTR_ERR(regmap);
186
187 i2c_set_clientdata(client, regmap);
188
189 if (of_property_read_bool(dev->of_node, "interrupt-controller")) {
190 rc = pm8008_probe_irq_peripherals(dev, regmap, client->irq);
191 if (rc)
192 dev_err(dev, "Failed to probe irq periphs: %d\n", rc);
193 }
194
195 return devm_of_platform_populate(dev);
196 }
197
198 static const struct of_device_id pm8008_match[] = {
199 { .compatible = "qcom,pm8008", },
200 { },
201 };
202 MODULE_DEVICE_TABLE(of, pm8008_match);
203
204 static struct i2c_driver pm8008_mfd_driver = {
205 .driver = {
206 .name = "pm8008",
207 .of_match_table = pm8008_match,
208 },
209 .probe = pm8008_probe,
210 };
211 module_i2c_driver(pm8008_mfd_driver);
212
213 MODULE_LICENSE("GPL v2");
214