projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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"); |