| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/device.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/io.h> |
| 17 | #include <linux/nvmem-provider.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | |
| 20 | static int qfprom_reg_read(void *context, |
| 21 | unsigned int reg, void *_val, size_t bytes) |
| 22 | { |
| 23 | void __iomem *base = context; |
| 24 | u8 *val = _val; |
| 25 | int i = 0, words = bytes; |
| 26 | |
| 27 | while (words--) |
| 28 | *val++ = readb(base + reg + i++); |
| 29 | |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | static int qfprom_remove(struct platform_device *pdev) |
| 34 | { |
| 35 | struct nvmem_device *nvmem = platform_get_drvdata(pdev); |
| 36 | |
| 37 | return nvmem_unregister(nvmem); |
| 38 | } |
| 39 | |
| 40 | static struct nvmem_config econfig = { |
| 41 | .name = "qfprom", |
| 42 | .owner = THIS_MODULE, |
| 43 | .stride = 1, |
| 44 | .word_size = 1, |
| 45 | .reg_read = qfprom_reg_read, |
| 46 | }; |
| 47 | |
| 48 | static int qfprom_probe(struct platform_device *pdev) |
| 49 | { |
| 50 | struct device *dev = &pdev->dev; |
| 51 | struct resource *res; |
| 52 | struct nvmem_device *nvmem; |
| 53 | void __iomem *base; |
| 54 | |
| 55 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 56 | base = devm_ioremap_resource(dev, res); |
| 57 | if (IS_ERR(base)) |
| 58 | return PTR_ERR(base); |
| 59 | |
| 60 | econfig.size = resource_size(res); |
| 61 | econfig.dev = dev; |
| 62 | econfig.priv = base; |
| 63 | |
| 64 | nvmem = nvmem_register(&econfig); |
| 65 | if (IS_ERR(nvmem)) |
| 66 | return PTR_ERR(nvmem); |
| 67 | |
| 68 | platform_set_drvdata(pdev, nvmem); |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static const struct of_device_id qfprom_of_match[] = { |
| 74 | { .compatible = "qcom,qfprom",}, |
| 75 | {/* sentinel */}, |
| 76 | }; |
| 77 | MODULE_DEVICE_TABLE(of, qfprom_of_match); |
| 78 | |
| 79 | static struct platform_driver qfprom_driver = { |
| 80 | .probe = qfprom_probe, |
| 81 | .remove = qfprom_remove, |
| 82 | .driver = { |
| 83 | .name = "qcom,qfprom", |
| 84 | .of_match_table = qfprom_of_match, |
| 85 | }, |
| 86 | }; |
| 87 | module_platform_driver(qfprom_driver); |
| 88 | MODULE_AUTHOR("Srinivas Kandagatla <srinivas.kandagatla@linaro.org>"); |
| 89 | MODULE_DESCRIPTION("Qualcomm QFPROM driver"); |
| 90 | MODULE_LICENSE("GPL v2"); |