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 
34 static const struct mfd_cell hi6421_devs[] = {
35 	{ .name = "hi6421-regulator", },
36 };
37 
38 static 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 
45 static 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 
89 static int hi6421_pmic_remove(struct platform_device *pdev)
90 {
91 	mfd_remove_devices(&pdev->dev);
92 
93 	return 0;
94 }
95 
96 static struct of_device_id of_hi6421_pmic_match_tbl[] = {
97 	{ .compatible = "hisilicon,hi6421-pmic", },
98 	{ },
99 };
100 
101 static 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 };
109 module_platform_driver(hi6421_pmic_driver);
110 
111 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
112 MODULE_DESCRIPTION("Hi6421 PMIC driver");
113 MODULE_LICENSE("GPL v2");
114