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ad855eae | 1 | /* |
9593ad32 | 2 | * Amlogic Meson GX eFuse Driver |
ad855eae CC |
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 | { | |
a29a63bd JB |
27 | return meson_sm_call_read((u8 *)val, bytes, SM_EFUSE_READ, offset, |
28 | bytes, 0, 0, 0); | |
ad855eae CC |
29 | } |
30 | ||
e5507730 JB |
31 | static int meson_efuse_write(void *context, unsigned int offset, |
32 | void *val, size_t bytes) | |
33 | { | |
34 | return meson_sm_call_write((u8 *)val, bytes, SM_EFUSE_WRITE, offset, | |
35 | bytes, 0, 0, 0); | |
36 | } | |
37 | ||
ad855eae CC |
38 | static const struct of_device_id meson_efuse_match[] = { |
39 | { .compatible = "amlogic,meson-gxbb-efuse", }, | |
40 | { /* sentinel */ }, | |
41 | }; | |
42 | MODULE_DEVICE_TABLE(of, meson_efuse_match); | |
43 | ||
44 | static int meson_efuse_probe(struct platform_device *pdev) | |
45 | { | |
401488d1 | 46 | struct device *dev = &pdev->dev; |
ad855eae | 47 | struct nvmem_device *nvmem; |
401488d1 | 48 | struct nvmem_config *econfig; |
ad855eae CC |
49 | unsigned int size; |
50 | ||
51 | if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) | |
52 | return -EINVAL; | |
53 | ||
401488d1 JB |
54 | econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL); |
55 | if (!econfig) | |
56 | return -ENOMEM; | |
57 | ||
58 | econfig->dev = dev; | |
59 | econfig->name = dev_name(dev); | |
60 | econfig->stride = 1; | |
61 | econfig->word_size = 1; | |
401488d1 | 62 | econfig->reg_read = meson_efuse_read; |
e5507730 | 63 | econfig->reg_write = meson_efuse_write; |
401488d1 | 64 | econfig->size = size; |
ad855eae | 65 | |
401488d1 | 66 | nvmem = devm_nvmem_register(&pdev->dev, econfig); |
ad855eae | 67 | |
90696a40 | 68 | return PTR_ERR_OR_ZERO(nvmem); |
ad855eae CC |
69 | } |
70 | ||
71 | static struct platform_driver meson_efuse_driver = { | |
72 | .probe = meson_efuse_probe, | |
ad855eae CC |
73 | .driver = { |
74 | .name = "meson-efuse", | |
75 | .of_match_table = meson_efuse_match, | |
76 | }, | |
77 | }; | |
78 | ||
79 | module_platform_driver(meson_efuse_driver); | |
80 | ||
81 | MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>"); | |
9593ad32 | 82 | MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver"); |
ad855eae | 83 | MODULE_LICENSE("GPL v2"); |