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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 | { | |
8cde3c21 CC |
20 | struct meson_sm_firmware *fw = context; |
21 | ||
22 | return meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset, | |
a29a63bd | 23 | bytes, 0, 0, 0); |
ad855eae CC |
24 | } |
25 | ||
e5507730 JB |
26 | static int meson_efuse_write(void *context, unsigned int offset, |
27 | void *val, size_t bytes) | |
28 | { | |
8cde3c21 CC |
29 | struct meson_sm_firmware *fw = context; |
30 | ||
31 | return meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset, | |
e5507730 JB |
32 | bytes, 0, 0, 0); |
33 | } | |
34 | ||
ad855eae CC |
35 | static const struct of_device_id meson_efuse_match[] = { |
36 | { .compatible = "amlogic,meson-gxbb-efuse", }, | |
37 | { /* sentinel */ }, | |
38 | }; | |
39 | MODULE_DEVICE_TABLE(of, meson_efuse_match); | |
40 | ||
41 | static int meson_efuse_probe(struct platform_device *pdev) | |
42 | { | |
401488d1 | 43 | struct device *dev = &pdev->dev; |
8cde3c21 CC |
44 | struct meson_sm_firmware *fw; |
45 | struct device_node *sm_np; | |
ad855eae | 46 | struct nvmem_device *nvmem; |
401488d1 | 47 | struct nvmem_config *econfig; |
611fbca1 | 48 | struct clk *clk; |
ad855eae | 49 | unsigned int size; |
611fbca1 JB |
50 | int ret; |
51 | ||
8cde3c21 CC |
52 | sm_np = of_parse_phandle(pdev->dev.of_node, "secure-monitor", 0); |
53 | if (!sm_np) { | |
54 | dev_err(&pdev->dev, "no secure-monitor node\n"); | |
55 | return -ENODEV; | |
56 | } | |
57 | ||
58 | fw = meson_sm_get(sm_np); | |
59 | of_node_put(sm_np); | |
60 | if (!fw) | |
61 | return -EPROBE_DEFER; | |
62 | ||
611fbca1 JB |
63 | clk = devm_clk_get(dev, NULL); |
64 | if (IS_ERR(clk)) { | |
65 | ret = PTR_ERR(clk); | |
66 | if (ret != -EPROBE_DEFER) | |
67 | dev_err(dev, "failed to get efuse gate"); | |
68 | return ret; | |
69 | } | |
70 | ||
71 | ret = clk_prepare_enable(clk); | |
72 | if (ret) { | |
73 | dev_err(dev, "failed to enable gate"); | |
74 | return ret; | |
75 | } | |
76 | ||
77 | ret = devm_add_action_or_reset(dev, | |
78 | (void(*)(void *))clk_disable_unprepare, | |
79 | clk); | |
80 | if (ret) { | |
81 | dev_err(dev, "failed to add disable callback"); | |
82 | return ret; | |
83 | } | |
ad855eae | 84 | |
8cde3c21 | 85 | if (meson_sm_call(fw, SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) { |
8649dbe5 | 86 | dev_err(dev, "failed to get max user"); |
ad855eae | 87 | return -EINVAL; |
8649dbe5 | 88 | } |
ad855eae | 89 | |
401488d1 JB |
90 | econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL); |
91 | if (!econfig) | |
92 | return -ENOMEM; | |
93 | ||
94 | econfig->dev = dev; | |
95 | econfig->name = dev_name(dev); | |
96 | econfig->stride = 1; | |
97 | econfig->word_size = 1; | |
401488d1 | 98 | econfig->reg_read = meson_efuse_read; |
e5507730 | 99 | econfig->reg_write = meson_efuse_write; |
401488d1 | 100 | econfig->size = size; |
8cde3c21 | 101 | econfig->priv = fw; |
ad855eae | 102 | |
401488d1 | 103 | nvmem = devm_nvmem_register(&pdev->dev, econfig); |
ad855eae | 104 | |
90696a40 | 105 | return PTR_ERR_OR_ZERO(nvmem); |
ad855eae CC |
106 | } |
107 | ||
108 | static struct platform_driver meson_efuse_driver = { | |
109 | .probe = meson_efuse_probe, | |
ad855eae CC |
110 | .driver = { |
111 | .name = "meson-efuse", | |
112 | .of_match_table = meson_efuse_match, | |
113 | }, | |
114 | }; | |
115 | ||
116 | module_platform_driver(meson_efuse_driver); | |
117 | ||
118 | MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>"); | |
9593ad32 | 119 | MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver"); |
ad855eae | 120 | MODULE_LICENSE("GPL v2"); |