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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2021 ROHM Semiconductors
4 *
5 * ROHM BD9576MUF and BD9573MUF PMIC driver
6 */
7
8#include <linux/i2c.h>
9#include <linux/interrupt.h>
10#include <linux/ioport.h>
11#include <linux/irq.h>
12#include <linux/mfd/core.h>
13#include <linux/mfd/rohm-bd957x.h>
14#include <linux/mfd/rohm-generic.h>
15#include <linux/module.h>
16#include <linux/of_device.h>
17#include <linux/regmap.h>
18#include <linux/types.h>
19
20enum {
21 BD957X_REGULATOR_CELL,
22 BD957X_WDT_CELL,
23};
24
25/*
26 * Due to the BD9576MUF nasty IRQ behaiour we don't always populate IRQs.
27 * These will be added to regulator resources only if IRQ information for the
28 * PMIC is populated in device-tree.
29 */
30static const struct resource bd9576_regulator_irqs[] = {
31 DEFINE_RES_IRQ_NAMED(BD9576_INT_THERM, "bd9576-temp"),
32 DEFINE_RES_IRQ_NAMED(BD9576_INT_OVD, "bd9576-ovd"),
33 DEFINE_RES_IRQ_NAMED(BD9576_INT_UVD, "bd9576-uvd"),
34};
35
36static struct mfd_cell bd9573_mfd_cells[] = {
37 [BD957X_REGULATOR_CELL] = { .name = "bd9573-regulator", },
38 [BD957X_WDT_CELL] = { .name = "bd9576-wdt", },
39};
40
41static struct mfd_cell bd9576_mfd_cells[] = {
42 [BD957X_REGULATOR_CELL] = { .name = "bd9576-regulator", },
43 [BD957X_WDT_CELL] = { .name = "bd9576-wdt", },
44};
45
46static const struct regmap_range volatile_ranges[] = {
47 regmap_reg_range(BD957X_REG_SMRB_ASSERT, BD957X_REG_SMRB_ASSERT),
48 regmap_reg_range(BD957X_REG_PMIC_INTERNAL_STAT,
49 BD957X_REG_PMIC_INTERNAL_STAT),
50 regmap_reg_range(BD957X_REG_INT_THERM_STAT, BD957X_REG_INT_THERM_STAT),
51 regmap_reg_range(BD957X_REG_INT_OVP_STAT, BD957X_REG_INT_SYS_STAT),
52 regmap_reg_range(BD957X_REG_INT_MAIN_STAT, BD957X_REG_INT_MAIN_STAT),
53};
54
55static const struct regmap_access_table volatile_regs = {
56 .yes_ranges = &volatile_ranges[0],
57 .n_yes_ranges = ARRAY_SIZE(volatile_ranges),
58};
59
60static struct regmap_config bd957x_regmap = {
61 .reg_bits = 8,
62 .val_bits = 8,
63 .volatile_table = &volatile_regs,
64 .max_register = BD957X_MAX_REGISTER,
65 .cache_type = REGCACHE_RBTREE,
66};
67
68static struct regmap_irq bd9576_irqs[] = {
69 REGMAP_IRQ_REG(BD9576_INT_THERM, 0, BD957X_MASK_INT_MAIN_THERM),
70 REGMAP_IRQ_REG(BD9576_INT_OVP, 0, BD957X_MASK_INT_MAIN_OVP),
71 REGMAP_IRQ_REG(BD9576_INT_SCP, 0, BD957X_MASK_INT_MAIN_SCP),
72 REGMAP_IRQ_REG(BD9576_INT_OCP, 0, BD957X_MASK_INT_MAIN_OCP),
73 REGMAP_IRQ_REG(BD9576_INT_OVD, 0, BD957X_MASK_INT_MAIN_OVD),
74 REGMAP_IRQ_REG(BD9576_INT_UVD, 0, BD957X_MASK_INT_MAIN_UVD),
75 REGMAP_IRQ_REG(BD9576_INT_UVP, 0, BD957X_MASK_INT_MAIN_UVP),
76 REGMAP_IRQ_REG(BD9576_INT_SYS, 0, BD957X_MASK_INT_MAIN_SYS),
77};
78
79static struct regmap_irq_chip bd9576_irq_chip = {
80 .name = "bd9576_irq",
81 .irqs = &bd9576_irqs[0],
82 .num_irqs = ARRAY_SIZE(bd9576_irqs),
83 .status_base = BD957X_REG_INT_MAIN_STAT,
84 .mask_base = BD957X_REG_INT_MAIN_MASK,
85 .ack_base = BD957X_REG_INT_MAIN_STAT,
86 .init_ack_masked = true,
87 .num_regs = 1,
88 .irq_reg_stride = 1,
89};
90
91static int bd957x_i2c_probe(struct i2c_client *i2c,
92 const struct i2c_device_id *id)
93{
94 int ret;
95 struct regmap *regmap;
96 struct mfd_cell *cells;
97 int num_cells;
98 unsigned long chip_type;
99 struct irq_domain *domain;
100 bool usable_irqs;
101
102 chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
103
104 switch (chip_type) {
105 case ROHM_CHIP_TYPE_BD9576:
106 cells = bd9576_mfd_cells;
107 num_cells = ARRAY_SIZE(bd9576_mfd_cells);
108 usable_irqs = !!i2c->irq;
109 break;
110 case ROHM_CHIP_TYPE_BD9573:
111 cells = bd9573_mfd_cells;
112 num_cells = ARRAY_SIZE(bd9573_mfd_cells);
113 /*
114 * BD9573 only supports fatal IRQs which we can not handle
115 * because SoC is going to lose the power.
116 */
117 usable_irqs = false;
118 break;
119 default:
120 dev_err(&i2c->dev, "Unknown device type");
121 return -EINVAL;
122 }
123
124 regmap = devm_regmap_init_i2c(i2c, &bd957x_regmap);
125 if (IS_ERR(regmap)) {
126 dev_err(&i2c->dev, "Failed to initialize Regmap\n");
127 return PTR_ERR(regmap);
128 }
129
130 /*
131 * BD9576 behaves badly. It kepts IRQ line asserted for the whole
132 * duration of detected HW condition (like over temperature). So we
133 * don't require IRQ to be populated.
134 * If IRQ information is not given, then we mask all IRQs and do not
135 * provide IRQ resources to regulator driver - which then just omits
136 * the notifiers.
137 */
138 if (usable_irqs) {
139 struct regmap_irq_chip_data *irq_data;
140 struct mfd_cell *regulators;
141
142 regulators = &bd9576_mfd_cells[BD957X_REGULATOR_CELL];
143 regulators->resources = bd9576_regulator_irqs;
144 regulators->num_resources = ARRAY_SIZE(bd9576_regulator_irqs);
145
146 ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
147 IRQF_ONESHOT, 0,
148 &bd9576_irq_chip, &irq_data);
149 if (ret) {
150 dev_err(&i2c->dev, "Failed to add IRQ chip\n");
151 return ret;
152 }
153 domain = regmap_irq_get_domain(irq_data);
154 } else {
155 ret = regmap_update_bits(regmap, BD957X_REG_INT_MAIN_MASK,
156 BD957X_MASK_INT_ALL,
157 BD957X_MASK_INT_ALL);
158 if (ret)
159 return ret;
160 domain = NULL;
161 }
162
163 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, cells,
164 num_cells, NULL, 0, domain);
165 if (ret)
166 dev_err(&i2c->dev, "Failed to create subdevices\n");
167
168 return ret;
169}
170
171static const struct of_device_id bd957x_of_match[] = {
172 { .compatible = "rohm,bd9576", .data = (void *)ROHM_CHIP_TYPE_BD9576, },
173 { .compatible = "rohm,bd9573", .data = (void *)ROHM_CHIP_TYPE_BD9573, },
174 { },
175};
176MODULE_DEVICE_TABLE(of, bd957x_of_match);
177
178static struct i2c_driver bd957x_drv = {
179 .driver = {
180 .name = "rohm-bd957x",
181 .of_match_table = bd957x_of_match,
182 },
183 .probe = &bd957x_i2c_probe,
184};
185module_i2c_driver(bd957x_drv);
186
187MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
188MODULE_DESCRIPTION("ROHM BD9576MUF and BD9573MUF Power Management IC driver");
189MODULE_LICENSE("GPL");