meson-efuse.c (75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37) meson-efuse.c (8cde3c2153e8f57be884c0e73f18bc4de150e870)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Amlogic Meson GX eFuse Driver
4 *
5 * Copyright (c) 2016 Endless Computers, Inc.
6 * Author: Carlo Caione <carlo@endlessm.com>
7 */
8
9#include <linux/clk.h>
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
17static int meson_efuse_read(void *context, unsigned int offset,
18 void *val, size_t bytes)
19{
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Amlogic Meson GX eFuse Driver
4 *
5 * Copyright (c) 2016 Endless Computers, Inc.
6 * Author: Carlo Caione <carlo@endlessm.com>
7 */
8
9#include <linux/clk.h>
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
17static int meson_efuse_read(void *context, unsigned int offset,
18 void *val, size_t bytes)
19{
20 return meson_sm_call_read((u8 *)val, bytes, SM_EFUSE_READ, offset,
20 struct meson_sm_firmware *fw = context;
21
22 return meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
21 bytes, 0, 0, 0);
22}
23
24static int meson_efuse_write(void *context, unsigned int offset,
25 void *val, size_t bytes)
26{
23 bytes, 0, 0, 0);
24}
25
26static int meson_efuse_write(void *context, unsigned int offset,
27 void *val, size_t bytes)
28{
27 return meson_sm_call_write((u8 *)val, bytes, SM_EFUSE_WRITE, offset,
29 struct meson_sm_firmware *fw = context;
30
31 return meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
28 bytes, 0, 0, 0);
29}
30
31static const struct of_device_id meson_efuse_match[] = {
32 { .compatible = "amlogic,meson-gxbb-efuse", },
33 { /* sentinel */ },
34};
35MODULE_DEVICE_TABLE(of, meson_efuse_match);
36
37static int meson_efuse_probe(struct platform_device *pdev)
38{
39 struct device *dev = &pdev->dev;
32 bytes, 0, 0, 0);
33}
34
35static const struct of_device_id meson_efuse_match[] = {
36 { .compatible = "amlogic,meson-gxbb-efuse", },
37 { /* sentinel */ },
38};
39MODULE_DEVICE_TABLE(of, meson_efuse_match);
40
41static int meson_efuse_probe(struct platform_device *pdev)
42{
43 struct device *dev = &pdev->dev;
44 struct meson_sm_firmware *fw;
45 struct device_node *sm_np;
40 struct nvmem_device *nvmem;
41 struct nvmem_config *econfig;
42 struct clk *clk;
43 unsigned int size;
44 int ret;
45
46 struct nvmem_device *nvmem;
47 struct nvmem_config *econfig;
48 struct clk *clk;
49 unsigned int size;
50 int ret;
51
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
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

--- 6 unchanged lines hidden (view full) ---

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 }
67
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

--- 6 unchanged lines hidden (view full) ---

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 }
84
68 if (meson_sm_call(SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
85 if (meson_sm_call(fw, SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
69 dev_err(dev, "failed to get max user");
70 return -EINVAL;
71 }
72
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;
81 econfig->reg_read = meson_efuse_read;
82 econfig->reg_write = meson_efuse_write;
83 econfig->size = size;
86 dev_err(dev, "failed to get max user");
87 return -EINVAL;
88 }
89
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;
98 econfig->reg_read = meson_efuse_read;
99 econfig->reg_write = meson_efuse_write;
100 econfig->size = size;
101 econfig->priv = fw;
84
85 nvmem = devm_nvmem_register(&pdev->dev, econfig);
86
87 return PTR_ERR_OR_ZERO(nvmem);
88}
89
90static struct platform_driver meson_efuse_driver = {
91 .probe = meson_efuse_probe,
92 .driver = {
93 .name = "meson-efuse",
94 .of_match_table = meson_efuse_match,
95 },
96};
97
98module_platform_driver(meson_efuse_driver);
99
100MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
101MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver");
102MODULE_LICENSE("GPL v2");
102
103 nvmem = devm_nvmem_register(&pdev->dev, econfig);
104
105 return PTR_ERR_OR_ZERO(nvmem);
106}
107
108static struct platform_driver meson_efuse_driver = {
109 .probe = meson_efuse_probe,
110 .driver = {
111 .name = "meson-efuse",
112 .of_match_table = meson_efuse_match,
113 },
114};
115
116module_platform_driver(meson_efuse_driver);
117
118MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
119MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver");
120MODULE_LICENSE("GPL v2");