projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 3edba6b4 PZ |
1 | /* |
| 2 | * i.MX6 OCOTP fusebox driver | |
| 3 | * | |
| 4 | * Copyright (c) 2015 Pengutronix, Philipp Zabel <p.zabel@pengutronix.de> | |
| 5 | * | |
| 6 | * Based on the barebox ocotp driver, | |
| 7 | * Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>, | |
| 8 | * Orex Computed Radiography | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or modify | |
| 11 | * it under the terms of the GNU General Public License version 2 | |
| 12 | * as published by the Free Software Foundation. | |
| 13 | * | |
| 14 | * http://www.opensource.org/licenses/gpl-license.html | |
| 15 | * http://www.gnu.org/copyleft/gpl.html | |
| 16 | */ | |
| 17 | ||
| 18 | #include <linux/device.h> | |
| 19 | #include <linux/io.h> | |
| 20 | #include <linux/module.h> | |
| 21 | #include <linux/nvmem-provider.h> | |
| 22 | #include <linux/of.h> | |
| 23 | #include <linux/of_device.h> | |
| 24 | #include <linux/platform_device.h> | |
| 3edba6b4 PZ |
25 | #include <linux/slab.h> |
| 26 | ||
| 27 | struct ocotp_priv { | |
| 28 | struct device *dev; | |
| 29 | void __iomem *base; | |
| 30 | unsigned int nregs; | |
| 31 | }; | |
| 32 | ||
| 33e5e29c SK |
33 | static int imx_ocotp_read(void *context, unsigned int offset, |
| 34 | void *val, size_t bytes) | |
| 3edba6b4 PZ |
35 | { |
| 36 | struct ocotp_priv *priv = context; | |
| 3edba6b4 | 37 | unsigned int count; |
| 33e5e29c | 38 | u32 *buf = val; |
| 3edba6b4 PZ |
39 | int i; |
| 40 | u32 index; | |
| 41 | ||
| 42 | index = offset >> 2; | |
| 33e5e29c | 43 | count = bytes >> 2; |
| 3edba6b4 PZ |
44 | |
| 45 | if (count > (priv->nregs - index)) | |
| 46 | count = priv->nregs - index; | |
| 47 | ||
| 33e5e29c SK |
48 | for (i = index; i < (index + count); i++) |
| 49 | *buf++ = readl(priv->base + 0x400 + i * 0x10); | |
| 3edba6b4 | 50 | |
| c7e3c5f8 | 51 | return 0; |
| 3edba6b4 PZ |
52 | } |
| 53 | ||
| 3edba6b4 PZ |
54 | static struct nvmem_config imx_ocotp_nvmem_config = { |
| 55 | .name = "imx-ocotp", | |
| 56 | .read_only = true, | |
| 33e5e29c SK |
57 | .word_size = 4, |
| 58 | .stride = 4, | |
| 3edba6b4 | 59 | .owner = THIS_MODULE, |
| 33e5e29c | 60 | .reg_read = imx_ocotp_read, |
| 3edba6b4 PZ |
61 | }; |
| 62 | ||
| 63 | static const struct of_device_id imx_ocotp_dt_ids[] = { | |
| 64 | { .compatible = "fsl,imx6q-ocotp", (void *)128 }, | |
| 65 | { .compatible = "fsl,imx6sl-ocotp", (void *)32 }, | |
| 66 | { .compatible = "fsl,imx6sx-ocotp", (void *)128 }, | |
| 67 | { }, | |
| 68 | }; | |
| 69 | MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids); | |
| 70 | ||
| 71 | static int imx_ocotp_probe(struct platform_device *pdev) | |
| 72 | { | |
| 73 | const struct of_device_id *of_id; | |
| 74 | struct device *dev = &pdev->dev; | |
| 75 | struct resource *res; | |
| 3edba6b4 PZ |
76 | struct ocotp_priv *priv; |
| 77 | struct nvmem_device *nvmem; | |
| 78 | ||
| 79 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
| 80 | if (!priv) | |
| 81 | return -ENOMEM; | |
| 82 | ||
| 83 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 84 | priv->base = devm_ioremap_resource(dev, res); | |
| 85 | if (IS_ERR(priv->base)) | |
| 86 | return PTR_ERR(priv->base); | |
| 87 | ||
| 88 | of_id = of_match_device(imx_ocotp_dt_ids, dev); | |
| 89 | priv->nregs = (unsigned int)of_id->data; | |
| 33e5e29c | 90 | imx_ocotp_nvmem_config.size = 4 * priv->nregs; |
| 3edba6b4 | 91 | imx_ocotp_nvmem_config.dev = dev; |
| 33e5e29c | 92 | imx_ocotp_nvmem_config.priv = priv; |
| 3edba6b4 PZ |
93 | nvmem = nvmem_register(&imx_ocotp_nvmem_config); |
| 94 | if (IS_ERR(nvmem)) | |
| 95 | return PTR_ERR(nvmem); | |
| 96 | ||
| 97 | platform_set_drvdata(pdev, nvmem); | |
| 98 | ||
| 99 | return 0; | |
| 100 | } | |
| 101 | ||
| 102 | static int imx_ocotp_remove(struct platform_device *pdev) | |
| 103 | { | |
| 104 | struct nvmem_device *nvmem = platform_get_drvdata(pdev); | |
| 105 | ||
| 106 | return nvmem_unregister(nvmem); | |
| 107 | } | |
| 108 | ||
| 109 | static struct platform_driver imx_ocotp_driver = { | |
| 110 | .probe = imx_ocotp_probe, | |
| 111 | .remove = imx_ocotp_remove, | |
| 112 | .driver = { | |
| 113 | .name = "imx_ocotp", | |
| 114 | .of_match_table = imx_ocotp_dt_ids, | |
| 115 | }, | |
| 116 | }; | |
| 117 | module_platform_driver(imx_ocotp_driver); | |
| 118 | ||
| 119 | MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>"); | |
| 120 | MODULE_DESCRIPTION("i.MX6 OCOTP fuse box driver"); | |
| 121 | MODULE_LICENSE("GPL v2"); |