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"); |