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
27static 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
38static 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
48static 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
55static 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
74static 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
84static 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
95static 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
116 regmap_read(pmic->regmap, HI655X_BUS_ADDR(HI655X_VER_REG), &pmic->ver);
117 if ((pmic->ver < PMU_VER_START) || (pmic->ver > PMU_VER_END)) {
118 dev_warn(dev, "PMU version %d unsupported\n", pmic->ver);
119 return -EINVAL;
120 }
121
122 hi655x_local_irq_clear(pmic->regmap);
123
124 pmic->gpio = of_get_named_gpio(np, "pmic-gpios", 0);
125 if (!gpio_is_valid(pmic->gpio)) {
126 dev_err(dev, "Failed to get the pmic-gpios\n");
127 return -ENODEV;
128 }
129
130 ret = devm_gpio_request_one(dev, pmic->gpio, GPIOF_IN,
131 "hi655x_pmic_irq");
132 if (ret < 0) {
133 dev_err(dev, "Failed to request gpio %d ret = %d\n",
134 pmic->gpio, ret);
135 return ret;
136 }
137
138 ret = regmap_add_irq_chip(pmic->regmap, gpio_to_irq(pmic->gpio),
139 IRQF_TRIGGER_LOW | IRQF_NO_SUSPEND, 0,
140 &hi655x_irq_chip, &pmic->irq_data);
141 if (ret) {
142 dev_err(dev, "Failed to obtain 'hi655x_pmic_irq' %d\n", ret);
143 return ret;
144 }
145
146 platform_set_drvdata(pdev, pmic);
147
148 ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, hi655x_pmic_devs,
149 ARRAY_SIZE(hi655x_pmic_devs), NULL, 0,
150 regmap_irq_get_domain(pmic->irq_data));
151 if (ret) {
152 dev_err(dev, "Failed to register device %d\n", ret);
153 regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
154 return ret;
155 }
156
157 return 0;
158}
159
160static int hi655x_pmic_remove(struct platform_device *pdev)
161{
162 struct hi655x_pmic *pmic = platform_get_drvdata(pdev);
163
164 regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
165 mfd_remove_devices(&pdev->dev);
166 return 0;
167}
168
169static const struct of_device_id hi655x_pmic_match[] = {
170 { .compatible = "hisilicon,hi655x-pmic", },
171 {},
172};
173MODULE_DEVICE_TABLE(of, hi655x_pmic_match);
174
175static struct platform_driver hi655x_pmic_driver = {
176 .driver = {
177 .name = "hi655x-pmic",
178 .of_match_table = of_match_ptr(hi655x_pmic_match),
179 },
180 .probe = hi655x_pmic_probe,
181 .remove = hi655x_pmic_remove,
182};
183module_platform_driver(hi655x_pmic_driver);
184
185MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
186MODULE_DESCRIPTION("Hisilicon hi655x PMIC driver");
187MODULE_LICENSE("GPL v2");
188