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Srinivas Kandagatla4ab11992015-07-27 12:15:00 +01001/*
2 * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14#include <linux/device.h>
15#include <linux/module.h>
Srinivas Kandagatla382c62f2016-04-24 20:28:08 +010016#include <linux/io.h>
Srinivas Kandagatla4ab11992015-07-27 12:15:00 +010017#include <linux/nvmem-provider.h>
18#include <linux/platform_device.h>
Srinivas Kandagatla4ab11992015-07-27 12:15:00 +010019
Srinivas Kandagatla382c62f2016-04-24 20:28:08 +010020static int qfprom_reg_read(void *context,
21 unsigned int reg, void *_val, size_t bytes)
22{
23 void __iomem *base = context;
24 u32 *val = _val;
25 int i = 0, words = bytes / 4;
Srinivas Kandagatla4ab11992015-07-27 12:15:00 +010026
Srinivas Kandagatla382c62f2016-04-24 20:28:08 +010027 while (words--)
28 *val++ = readl(base + reg + (i++ * 4));
29
30 return 0;
31}
32
33static int qfprom_reg_write(void *context,
34 unsigned int reg, void *_val, size_t bytes)
35{
36 void __iomem *base = context;
37 u32 *val = _val;
38 int i = 0, words = bytes / 4;
39
40 while (words--)
41 writel(*val++, base + reg + (i++ * 4));
42
43 return 0;
44}
Srinivas Kandagatla4ab11992015-07-27 12:15:00 +010045
46static int qfprom_remove(struct platform_device *pdev)
47{
48 struct nvmem_device *nvmem = platform_get_drvdata(pdev);
49
50 return nvmem_unregister(nvmem);
51}
52
Srinivas Kandagatla382c62f2016-04-24 20:28:08 +010053static struct nvmem_config econfig = {
54 .name = "qfprom",
55 .owner = THIS_MODULE,
56 .stride = 4,
57 .word_size = 1,
58 .reg_read = qfprom_reg_read,
59 .reg_write = qfprom_reg_write,
60};
61
Srinivas Kandagatla4ab11992015-07-27 12:15:00 +010062static int qfprom_probe(struct platform_device *pdev)
63{
64 struct device *dev = &pdev->dev;
65 struct resource *res;
66 struct nvmem_device *nvmem;
Srinivas Kandagatla4ab11992015-07-27 12:15:00 +010067 void __iomem *base;
68
69 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
70 base = devm_ioremap_resource(dev, res);
71 if (IS_ERR(base))
72 return PTR_ERR(base);
73
Srinivas Kandagatla382c62f2016-04-24 20:28:08 +010074 econfig.size = resource_size(res);
Srinivas Kandagatla4ab11992015-07-27 12:15:00 +010075 econfig.dev = dev;
Srinivas Kandagatla382c62f2016-04-24 20:28:08 +010076 econfig.priv = base;
77
Srinivas Kandagatla4ab11992015-07-27 12:15:00 +010078 nvmem = nvmem_register(&econfig);
79 if (IS_ERR(nvmem))
80 return PTR_ERR(nvmem);
81
82 platform_set_drvdata(pdev, nvmem);
83
84 return 0;
85}
86
87static const struct of_device_id qfprom_of_match[] = {
88 { .compatible = "qcom,qfprom",},
89 {/* sentinel */},
90};
91MODULE_DEVICE_TABLE(of, qfprom_of_match);
92
93static struct platform_driver qfprom_driver = {
94 .probe = qfprom_probe,
95 .remove = qfprom_remove,
96 .driver = {
97 .name = "qcom,qfprom",
98 .of_match_table = qfprom_of_match,
99 },
100};
101module_platform_driver(qfprom_driver);
102MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>");
103MODULE_DESCRIPTION("Qualcomm QFPROM driver");
104MODULE_LICENSE("GPL v2");