tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Anatop MFD driver
3 *
4 * Copyright (C) 2012 Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
5 * Copyright (C) 2012 Linaro
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation; either version 2 of the License, or
23 * (at your option) any later version.
24 *
25 * This program is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
28 * GNU General Public License for more details.
29 *
30 * You should have received a copy of the GNU General Public License along
31 * with this program; if not, write to the Free Software Foundation, Inc.,
32 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
33 *
34 */
35
36#include <linux/io.h>
37#include <linux/module.h>
38#include <linux/platform_device.h>
39#include <linux/of.h>
40#include <linux/of_platform.h>
41#include <linux/of_address.h>
42#include <linux/mfd/anatop.h>
43
44u32 anatop_get_bits(struct anatop *adata, u32 addr, int bit_shift,
45 int bit_width)
46{
47 u32 val, mask;
48
49 if (bit_width == 32)
50 mask = ~0;
51 else
52 mask = (1 << bit_width) - 1;
53
54 val = readl(adata->ioreg + addr);
55 val = (val >> bit_shift) & mask;
56
57 return val;
58}
59EXPORT_SYMBOL_GPL(anatop_get_bits);
60
61void anatop_set_bits(struct anatop *adata, u32 addr, int bit_shift,
62 int bit_width, u32 data)
63{
64 u32 val, mask;
65
66 if (bit_width == 32)
67 mask = ~0;
68 else
69 mask = (1 << bit_width) - 1;
70
71 spin_lock(&adata->reglock);
72 val = readl(adata->ioreg + addr) & ~(mask << bit_shift);
73 writel((data << bit_shift) | val, adata->ioreg + addr);
74 spin_unlock(&adata->reglock);
75}
76EXPORT_SYMBOL_GPL(anatop_set_bits);
77
78static const struct of_device_id of_anatop_match[] = {
79 { .compatible = "fsl,imx6q-anatop", },
80 { },
81};
82
83static int __devinit of_anatop_probe(struct platform_device *pdev)
84{
85 struct device *dev = &pdev->dev;
86 struct device_node *np = dev->of_node;
87 void *ioreg;
88 struct anatop *drvdata;
89
90 ioreg = of_iomap(np, 0);
91 if (!ioreg)
92 return -EADDRNOTAVAIL;
93 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
94 if (!drvdata)
95 return -ENOMEM;
96 drvdata->ioreg = ioreg;
97 spin_lock_init(&drvdata->reglock);
98 platform_set_drvdata(pdev, drvdata);
99 of_platform_populate(np, of_anatop_match, NULL, dev);
100
101 return 0;
102}
103
104static int __devexit of_anatop_remove(struct platform_device *pdev)
105{
106 struct anatop *drvdata;
107 drvdata = platform_get_drvdata(pdev);
108 iounmap(drvdata->ioreg);
109
110 return 0;
111}
112
113static struct platform_driver anatop_of_driver = {
114 .driver = {
115 .name = "anatop-mfd",
116 .owner = THIS_MODULE,
117 .of_match_table = of_anatop_match,
118 },
119 .probe = of_anatop_probe,
120 .remove = of_anatop_remove,
121};
122
123static int __init anatop_init(void)
124{
125 return platform_driver_register(&anatop_of_driver);
126}
127postcore_initcall(anatop_init);
128
129static void __exit anatop_exit(void)
130{
131 platform_driver_unregister(&anatop_of_driver);
132}
133module_exit(anatop_exit);
134
135MODULE_AUTHOR("Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
136MODULE_DESCRIPTION("ANATOP MFD driver");
137MODULE_LICENSE("GPL v2");