1/*
2 * Device driver for Hi6421 IC
3 *
4 * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
5 *              http://www.hisilicon.com
6 * Copyright (c) <2013-2014> Linaro Ltd.
7 *              http://www.linaro.org
8 *
9 * Author: Guodong Xu <guodong.xu@linaro.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
19 * more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
23 */
24
25#include <linux/device.h>
26#include <linux/err.h>
27#include <linux/mfd/core.h>
28#include <linux/module.h>
29#include <linux/of.h>
30#include <linux/platform_device.h>
31#include <linux/regmap.h>
32#include <linux/mfd/hi6421-pmic.h>
33
34static const struct mfd_cell hi6421_devs[] = {
35	{ .name = "hi6421-regulator", },
36};
37
38static const struct regmap_config hi6421_regmap_config = {
39	.reg_bits = 32,
40	.reg_stride = 4,
41	.val_bits = 8,
42	.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
43};
44
45static int hi6421_pmic_probe(struct platform_device *pdev)
46{
47	struct hi6421_pmic *pmic;
48	struct resource *res;
49	void __iomem *base;
50	int ret;
51
52	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
53	if (!pmic)
54		return -ENOMEM;
55
56	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
57	base = devm_ioremap_resource(&pdev->dev, res);
58	if (IS_ERR(base))
59		return PTR_ERR(base);
60
61	pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
62						 &hi6421_regmap_config);
63	if (IS_ERR(pmic->regmap)) {
64		dev_err(&pdev->dev,
65			"regmap init failed: %ld\n", PTR_ERR(pmic->regmap));
66		return PTR_ERR(pmic->regmap);
67	}
68
69	/* set over-current protection debounce 8ms */
70	regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
71				(HI6421_OCP_DEB_SEL_MASK
72				 | HI6421_OCP_EN_DEBOUNCE_MASK
73				 | HI6421_OCP_AUTO_STOP_MASK),
74				(HI6421_OCP_DEB_SEL_8MS
75				 | HI6421_OCP_EN_DEBOUNCE_ENABLE));
76
77	platform_set_drvdata(pdev, pmic);
78
79	ret = mfd_add_devices(&pdev->dev, 0, hi6421_devs,
80			ARRAY_SIZE(hi6421_devs), NULL, 0, NULL);
81	if (ret) {
82		dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret);
83		return ret;
84	}
85
86	return 0;
87}
88
89static int hi6421_pmic_remove(struct platform_device *pdev)
90{
91	mfd_remove_devices(&pdev->dev);
92
93	return 0;
94}
95
96static const struct of_device_id of_hi6421_pmic_match_tbl[] = {
97	{ .compatible = "hisilicon,hi6421-pmic", },
98	{ },
99};
100
101static struct platform_driver hi6421_pmic_driver = {
102	.driver = {
103		.name	= "hi6421_pmic",
104		.of_match_table = of_hi6421_pmic_match_tbl,
105	},
106	.probe	= hi6421_pmic_probe,
107	.remove	= hi6421_pmic_remove,
108};
109module_platform_driver(hi6421_pmic_driver);
110
111MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
112MODULE_DESCRIPTION("Hi6421 PMIC driver");
113MODULE_LICENSE("GPL v2");
114