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ad855eae CC |
1 | /* |
2 | * Amlogic eFuse Driver | |
3 | * | |
4 | * Copyright (c) 2016 Endless Computers, Inc. | |
5 | * Author: Carlo Caione <carlo@endlessm.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of version 2 of the GNU General Public License as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/nvmem-provider.h> | |
19 | #include <linux/of.h> | |
20 | #include <linux/platform_device.h> | |
21 | ||
22 | #include <linux/firmware/meson/meson_sm.h> | |
23 | ||
24 | static int meson_efuse_read(void *context, unsigned int offset, | |
25 | void *val, size_t bytes) | |
26 | { | |
27 | u8 *buf = val; | |
28 | int ret; | |
29 | ||
30 | ret = meson_sm_call_read(buf, SM_EFUSE_READ, offset, | |
31 | bytes, 0, 0, 0); | |
32 | if (ret < 0) | |
33 | return ret; | |
34 | ||
35 | return 0; | |
36 | } | |
37 | ||
38 | static struct nvmem_config econfig = { | |
39 | .name = "meson-efuse", | |
40 | .owner = THIS_MODULE, | |
41 | .stride = 1, | |
42 | .word_size = 1, | |
43 | .read_only = true, | |
44 | }; | |
45 | ||
46 | static const struct of_device_id meson_efuse_match[] = { | |
47 | { .compatible = "amlogic,meson-gxbb-efuse", }, | |
48 | { /* sentinel */ }, | |
49 | }; | |
50 | MODULE_DEVICE_TABLE(of, meson_efuse_match); | |
51 | ||
52 | static int meson_efuse_probe(struct platform_device *pdev) | |
53 | { | |
54 | struct nvmem_device *nvmem; | |
55 | unsigned int size; | |
56 | ||
57 | if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) | |
58 | return -EINVAL; | |
59 | ||
60 | econfig.dev = &pdev->dev; | |
61 | econfig.reg_read = meson_efuse_read; | |
62 | econfig.size = size; | |
63 | ||
64 | nvmem = nvmem_register(&econfig); | |
65 | if (IS_ERR(nvmem)) | |
66 | return PTR_ERR(nvmem); | |
67 | ||
68 | platform_set_drvdata(pdev, nvmem); | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | static int meson_efuse_remove(struct platform_device *pdev) | |
74 | { | |
75 | struct nvmem_device *nvmem = platform_get_drvdata(pdev); | |
76 | ||
77 | return nvmem_unregister(nvmem); | |
78 | } | |
79 | ||
80 | static struct platform_driver meson_efuse_driver = { | |
81 | .probe = meson_efuse_probe, | |
82 | .remove = meson_efuse_remove, | |
83 | .driver = { | |
84 | .name = "meson-efuse", | |
85 | .of_match_table = meson_efuse_match, | |
86 | }, | |
87 | }; | |
88 | ||
89 | module_platform_driver(meson_efuse_driver); | |
90 | ||
91 | MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>"); | |
92 | MODULE_DESCRIPTION("Amlogic Meson NVMEM driver"); | |
93 | MODULE_LICENSE("GPL v2"); |