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5b497af4 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ad855eae | 2 | /* |
9593ad32 | 3 | * Amlogic Meson GX eFuse Driver |
ad855eae CC |
4 | * |
5 | * Copyright (c) 2016 Endless Computers, Inc. | |
6 | * Author: Carlo Caione <carlo@endlessm.com> | |
ad855eae CC |
7 | */ |
8 | ||
611fbca1 | 9 | #include <linux/clk.h> |
ad855eae CC |
10 | #include <linux/module.h> |
11 | #include <linux/nvmem-provider.h> | |
12 | #include <linux/of.h> | |
13 | #include <linux/platform_device.h> | |
14 | ||
15 | #include <linux/firmware/meson/meson_sm.h> | |
16 | ||
17 | static int meson_efuse_read(void *context, unsigned int offset, | |
18 | void *val, size_t bytes) | |
19 | { | |
a29a63bd JB |
20 | return meson_sm_call_read((u8 *)val, bytes, SM_EFUSE_READ, offset, |
21 | bytes, 0, 0, 0); | |
ad855eae CC |
22 | } |
23 | ||
e5507730 JB |
24 | static int meson_efuse_write(void *context, unsigned int offset, |
25 | void *val, size_t bytes) | |
26 | { | |
27 | return meson_sm_call_write((u8 *)val, bytes, SM_EFUSE_WRITE, offset, | |
28 | bytes, 0, 0, 0); | |
29 | } | |
30 | ||
ad855eae CC |
31 | static const struct of_device_id meson_efuse_match[] = { |
32 | { .compatible = "amlogic,meson-gxbb-efuse", }, | |
33 | { /* sentinel */ }, | |
34 | }; | |
35 | MODULE_DEVICE_TABLE(of, meson_efuse_match); | |
36 | ||
37 | static int meson_efuse_probe(struct platform_device *pdev) | |
38 | { | |
401488d1 | 39 | struct device *dev = &pdev->dev; |
ad855eae | 40 | struct nvmem_device *nvmem; |
401488d1 | 41 | struct nvmem_config *econfig; |
611fbca1 | 42 | struct clk *clk; |
ad855eae | 43 | unsigned int size; |
611fbca1 JB |
44 | int ret; |
45 | ||
46 | clk = devm_clk_get(dev, NULL); | |
47 | if (IS_ERR(clk)) { | |
48 | ret = PTR_ERR(clk); | |
49 | if (ret != -EPROBE_DEFER) | |
50 | dev_err(dev, "failed to get efuse gate"); | |
51 | return ret; | |
52 | } | |
53 | ||
54 | ret = clk_prepare_enable(clk); | |
55 | if (ret) { | |
56 | dev_err(dev, "failed to enable gate"); | |
57 | return ret; | |
58 | } | |
59 | ||
60 | ret = devm_add_action_or_reset(dev, | |
61 | (void(*)(void *))clk_disable_unprepare, | |
62 | clk); | |
63 | if (ret) { | |
64 | dev_err(dev, "failed to add disable callback"); | |
65 | return ret; | |
66 | } | |
ad855eae | 67 | |
8649dbe5 JB |
68 | if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) { |
69 | dev_err(dev, "failed to get max user"); | |
ad855eae | 70 | return -EINVAL; |
8649dbe5 | 71 | } |
ad855eae | 72 | |
401488d1 JB |
73 | econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL); |
74 | if (!econfig) | |
75 | return -ENOMEM; | |
76 | ||
77 | econfig->dev = dev; | |
78 | econfig->name = dev_name(dev); | |
79 | econfig->stride = 1; | |
80 | econfig->word_size = 1; | |
401488d1 | 81 | econfig->reg_read = meson_efuse_read; |
e5507730 | 82 | econfig->reg_write = meson_efuse_write; |
401488d1 | 83 | econfig->size = size; |
ad855eae | 84 | |
401488d1 | 85 | nvmem = devm_nvmem_register(&pdev->dev, econfig); |
ad855eae | 86 | |
90696a40 | 87 | return PTR_ERR_OR_ZERO(nvmem); |
ad855eae CC |
88 | } |
89 | ||
90 | static struct platform_driver meson_efuse_driver = { | |
91 | .probe = meson_efuse_probe, | |
ad855eae CC |
92 | .driver = { |
93 | .name = "meson-efuse", | |
94 | .of_match_table = meson_efuse_match, | |
95 | }, | |
96 | }; | |
97 | ||
98 | module_platform_driver(meson_efuse_driver); | |
99 | ||
100 | MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>"); | |
9593ad32 | 101 | MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver"); |
ad855eae | 102 | MODULE_LICENSE("GPL v2"); |