1 /*
2 * Device driver for MFD hi655x PMIC
3 *
4 * Copyright (c) 2016 Hisilicon.
5 *
6 * Authors:
7 * Chen Feng <puck.chen@hisilicon.com>
8 * Fei Wang <w.f@huawei.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/gpio.h>
16 #include <linux/io.h>
17 #include <linux/interrupt.h>
18 #include <linux/init.h>
19 #include <linux/mfd/core.h>
20 #include <linux/mfd/hi655x-pmic.h>
21 #include <linux/module.h>
22 #include <linux/of_gpio.h>
23 #include <linux/of_platform.h>
24 #include <linux/platform_device.h>
25 #include <linux/regmap.h>
26
27 static const struct regmap_irq hi655x_irqs[] = {
28 { .reg_offset = 0, .mask = OTMP_D1R_INT_MASK },
29 { .reg_offset = 0, .mask = VSYS_2P5_R_INT_MASK },
30 { .reg_offset = 0, .mask = VSYS_UV_D3R_INT_MASK },
31 { .reg_offset = 0, .mask = VSYS_6P0_D200UR_INT_MASK },
32 { .reg_offset = 0, .mask = PWRON_D4SR_INT_MASK },
33 { .reg_offset = 0, .mask = PWRON_D20F_INT_MASK },
34 { .reg_offset = 0, .mask = PWRON_D20R_INT_MASK },
35 { .reg_offset = 0, .mask = RESERVE_INT_MASK },
36 };
37
38 static const struct regmap_irq_chip hi655x_irq_chip = {
39 .name = "hi655x-pmic",
40 .irqs = hi655x_irqs,
41 .num_regs = 1,
42 .num_irqs = ARRAY_SIZE(hi655x_irqs),
43 .status_base = HI655X_IRQ_STAT_BASE,
44 .ack_base = HI655X_IRQ_STAT_BASE,
45 .mask_base = HI655X_IRQ_MASK_BASE,
46 };
47
48 static struct regmap_config hi655x_regmap_config = {
49 .reg_bits = 32,
50 .reg_stride = HI655X_STRIDE,
51 .val_bits = 8,
52 .max_register = HI655X_BUS_ADDR(0x400) - HI655X_STRIDE,
53 };
54
55 static struct resource pwrkey_resources[] = {
56 {
57 .name = "down",
58 .start = PWRON_D20R_INT,
59 .end = PWRON_D20R_INT,
60 .flags = IORESOURCE_IRQ,
61 }, {
62 .name = "up",
63 .start = PWRON_D20F_INT,
64 .end = PWRON_D20F_INT,
65 .flags = IORESOURCE_IRQ,
66 }, {
67 .name = "hold 4s",
68 .start = PWRON_D4SR_INT,
69 .end = PWRON_D4SR_INT,
70 .flags = IORESOURCE_IRQ,
71 },
72 };
73
74 static const struct mfd_cell hi655x_pmic_devs[] = {
75 {
76 .name = "hi65xx-powerkey",
77 .num_resources = ARRAY_SIZE(pwrkey_resources),
78 .resources = &pwrkey_resources[0],
79 },
80 { .name = "hi655x-regulator", },
81 { .name = "hi655x-clk", },
82 };
83
hi655x_local_irq_clear(struct regmap * map)84 static void hi655x_local_irq_clear(struct regmap *map)
85 {
86 int i;
87
88 regmap_write(map, HI655X_ANA_IRQM_BASE, HI655X_IRQ_CLR);
89 for (i = 0; i < HI655X_IRQ_ARRAY; i++) {
90 regmap_write(map, HI655X_IRQ_STAT_BASE + i * HI655X_STRIDE,
91 HI655X_IRQ_CLR);
92 }
93 }
94
hi655x_pmic_probe(struct platform_device * pdev)95 static int hi655x_pmic_probe(struct platform_device *pdev)
96 {
97 int ret;
98 struct hi655x_pmic *pmic;
99 struct device *dev = &pdev->dev;
100 struct device_node *np = dev->of_node;
101 void __iomem *base;
102
103 pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
104 if (!pmic)
105 return -ENOMEM;
106 pmic->dev = dev;
107
108 pmic->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
109 base = devm_ioremap_resource(dev, pmic->res);
110 if (IS_ERR(base))
111 return PTR_ERR(base);
112
113 pmic->regmap = devm_regmap_init_mmio_clk(dev, NULL, base,
114 &hi655x_regmap_config);
115 if (IS_ERR(pmic->regmap))
116 return PTR_ERR(pmic->regmap);
117
118 regmap_read(pmic->regmap, HI655X_BUS_ADDR(HI655X_VER_REG), &pmic->ver);
119 if ((pmic->ver < PMU_VER_START) || (pmic->ver > PMU_VER_END)) {
120 dev_warn(dev, "PMU version %d unsupported\n", pmic->ver);
121 return -EINVAL;
122 }
123
124 hi655x_local_irq_clear(pmic->regmap);
125
126 pmic->gpio = of_get_named_gpio(np, "pmic-gpios", 0);
127 if (!gpio_is_valid(pmic->gpio)) {
128 dev_err(dev, "Failed to get the pmic-gpios\n");
129 return -ENODEV;
130 }
131
132 ret = devm_gpio_request_one(dev, pmic->gpio, GPIOF_IN,
133 "hi655x_pmic_irq");
134 if (ret < 0) {
135 dev_err(dev, "Failed to request gpio %d ret = %d\n",
136 pmic->gpio, ret);
137 return ret;
138 }
139
140 ret = regmap_add_irq_chip(pmic->regmap, gpio_to_irq(pmic->gpio),
141 IRQF_TRIGGER_LOW | IRQF_NO_SUSPEND, 0,
142 &hi655x_irq_chip, &pmic->irq_data);
143 if (ret) {
144 dev_err(dev, "Failed to obtain 'hi655x_pmic_irq' %d\n", ret);
145 return ret;
146 }
147
148 platform_set_drvdata(pdev, pmic);
149
150 ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, hi655x_pmic_devs,
151 ARRAY_SIZE(hi655x_pmic_devs), NULL, 0,
152 regmap_irq_get_domain(pmic->irq_data));
153 if (ret) {
154 dev_err(dev, "Failed to register device %d\n", ret);
155 regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
156 return ret;
157 }
158
159 return 0;
160 }
161
hi655x_pmic_remove(struct platform_device * pdev)162 static int hi655x_pmic_remove(struct platform_device *pdev)
163 {
164 struct hi655x_pmic *pmic = platform_get_drvdata(pdev);
165
166 regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
167 mfd_remove_devices(&pdev->dev);
168 return 0;
169 }
170
171 static const struct of_device_id hi655x_pmic_match[] = {
172 { .compatible = "hisilicon,hi655x-pmic", },
173 {},
174 };
175 MODULE_DEVICE_TABLE(of, hi655x_pmic_match);
176
177 static struct platform_driver hi655x_pmic_driver = {
178 .driver = {
179 .name = "hi655x-pmic",
180 .of_match_table = of_match_ptr(hi655x_pmic_match),
181 },
182 .probe = hi655x_pmic_probe,
183 .remove = hi655x_pmic_remove,
184 };
185 module_platform_driver(hi655x_pmic_driver);
186
187 MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
188 MODULE_DESCRIPTION("Hisilicon hi655x PMIC driver");
189 MODULE_LICENSE("GPL v2");
190