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1/*
2 * Amlogic Meson GX 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/clk.h>
18#include <linux/module.h>
19#include <linux/nvmem-provider.h>
20#include <linux/of.h>
21#include <linux/platform_device.h>
22
23#include <linux/firmware/meson/meson_sm.h>
24
25static int meson_efuse_read(void *context, unsigned int offset,
26 void *val, size_t bytes)
27{
28 return meson_sm_call_read((u8 *)val, bytes, SM_EFUSE_READ, offset,
29 bytes, 0, 0, 0);
30}
31
32static int meson_efuse_write(void *context, unsigned int offset,
33 void *val, size_t bytes)
34{
35 return meson_sm_call_write((u8 *)val, bytes, SM_EFUSE_WRITE, offset,
36 bytes, 0, 0, 0);
37}
38
39static const struct of_device_id meson_efuse_match[] = {
40 { .compatible = "amlogic,meson-gxbb-efuse", },
41 { /* sentinel */ },
42};
43MODULE_DEVICE_TABLE(of, meson_efuse_match);
44
45static int meson_efuse_probe(struct platform_device *pdev)
46{
47 struct device *dev = &pdev->dev;
48 struct nvmem_device *nvmem;
49 struct nvmem_config *econfig;
50 struct clk *clk;
51 unsigned int size;
52 int ret;
53
54 clk = devm_clk_get(dev, NULL);
55 if (IS_ERR(clk)) {
56 ret = PTR_ERR(clk);
57 if (ret != -EPROBE_DEFER)
58 dev_err(dev, "failed to get efuse gate");
59 return ret;
60 }
61
62 ret = clk_prepare_enable(clk);
63 if (ret) {
64 dev_err(dev, "failed to enable gate");
65 return ret;
66 }
67
68 ret = devm_add_action_or_reset(dev,
69 (void(*)(void *))clk_disable_unprepare,
70 clk);
71 if (ret) {
72 dev_err(dev, "failed to add disable callback");
73 return ret;
74 }
75
76 if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
77 dev_err(dev, "failed to get max user");
78 return -EINVAL;
79 }
80
81 econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
82 if (!econfig)
83 return -ENOMEM;
84
85 econfig->dev = dev;
86 econfig->name = dev_name(dev);
87 econfig->stride = 1;
88 econfig->word_size = 1;
89 econfig->reg_read = meson_efuse_read;
90 econfig->reg_write = meson_efuse_write;
91 econfig->size = size;
92
93 nvmem = devm_nvmem_register(&pdev->dev, econfig);
94
95 return PTR_ERR_OR_ZERO(nvmem);
96}
97
98static struct platform_driver meson_efuse_driver = {
99 .probe = meson_efuse_probe,
100 .driver = {
101 .name = "meson-efuse",
102 .of_match_table = meson_efuse_match,
103 },
104};
105
106module_platform_driver(meson_efuse_driver);
107
108MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
109MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver");
110MODULE_LICENSE("GPL v2");
111

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