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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 | ||
deb31970 | 18 | #include <linux/clk.h> |
3edba6b4 PZ |
19 | #include <linux/device.h> |
20 | #include <linux/io.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/nvmem-provider.h> | |
23 | #include <linux/of.h> | |
24 | #include <linux/of_device.h> | |
25 | #include <linux/platform_device.h> | |
3edba6b4 PZ |
26 | #include <linux/slab.h> |
27 | ||
28 | struct ocotp_priv { | |
29 | struct device *dev; | |
deb31970 | 30 | struct clk *clk; |
3edba6b4 PZ |
31 | void __iomem *base; |
32 | unsigned int nregs; | |
33 | }; | |
34 | ||
33e5e29c SK |
35 | static int imx_ocotp_read(void *context, unsigned int offset, |
36 | void *val, size_t bytes) | |
3edba6b4 PZ |
37 | { |
38 | struct ocotp_priv *priv = context; | |
3edba6b4 | 39 | unsigned int count; |
33e5e29c | 40 | u32 *buf = val; |
deb31970 | 41 | int i, ret; |
3edba6b4 PZ |
42 | u32 index; |
43 | ||
44 | index = offset >> 2; | |
33e5e29c | 45 | count = bytes >> 2; |
3edba6b4 PZ |
46 | |
47 | if (count > (priv->nregs - index)) | |
48 | count = priv->nregs - index; | |
49 | ||
deb31970 PF |
50 | ret = clk_prepare_enable(priv->clk); |
51 | if (ret < 0) { | |
52 | dev_err(priv->dev, "failed to prepare/enable ocotp clk\n"); | |
53 | return ret; | |
54 | } | |
33e5e29c SK |
55 | for (i = index; i < (index + count); i++) |
56 | *buf++ = readl(priv->base + 0x400 + i * 0x10); | |
3edba6b4 | 57 | |
deb31970 PF |
58 | clk_disable_unprepare(priv->clk); |
59 | ||
c7e3c5f8 | 60 | return 0; |
3edba6b4 PZ |
61 | } |
62 | ||
3edba6b4 PZ |
63 | static struct nvmem_config imx_ocotp_nvmem_config = { |
64 | .name = "imx-ocotp", | |
65 | .read_only = true, | |
33e5e29c SK |
66 | .word_size = 4, |
67 | .stride = 4, | |
3edba6b4 | 68 | .owner = THIS_MODULE, |
33e5e29c | 69 | .reg_read = imx_ocotp_read, |
3edba6b4 PZ |
70 | }; |
71 | ||
72 | static const struct of_device_id imx_ocotp_dt_ids[] = { | |
73 | { .compatible = "fsl,imx6q-ocotp", (void *)128 }, | |
74 | { .compatible = "fsl,imx6sl-ocotp", (void *)32 }, | |
75 | { .compatible = "fsl,imx6sx-ocotp", (void *)128 }, | |
76 | { }, | |
77 | }; | |
78 | MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids); | |
79 | ||
80 | static int imx_ocotp_probe(struct platform_device *pdev) | |
81 | { | |
82 | const struct of_device_id *of_id; | |
83 | struct device *dev = &pdev->dev; | |
84 | struct resource *res; | |
3edba6b4 PZ |
85 | struct ocotp_priv *priv; |
86 | struct nvmem_device *nvmem; | |
87 | ||
88 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
89 | if (!priv) | |
90 | return -ENOMEM; | |
91 | ||
92 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
93 | priv->base = devm_ioremap_resource(dev, res); | |
94 | if (IS_ERR(priv->base)) | |
95 | return PTR_ERR(priv->base); | |
96 | ||
deb31970 PF |
97 | priv->clk = devm_clk_get(&pdev->dev, NULL); |
98 | if (IS_ERR(priv->clk)) | |
99 | return PTR_ERR(priv->clk); | |
100 | ||
3edba6b4 | 101 | of_id = of_match_device(imx_ocotp_dt_ids, dev); |
e2402b1d | 102 | priv->nregs = (unsigned long)of_id->data; |
33e5e29c | 103 | imx_ocotp_nvmem_config.size = 4 * priv->nregs; |
3edba6b4 | 104 | imx_ocotp_nvmem_config.dev = dev; |
33e5e29c | 105 | imx_ocotp_nvmem_config.priv = priv; |
3edba6b4 PZ |
106 | nvmem = nvmem_register(&imx_ocotp_nvmem_config); |
107 | if (IS_ERR(nvmem)) | |
108 | return PTR_ERR(nvmem); | |
109 | ||
110 | platform_set_drvdata(pdev, nvmem); | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int imx_ocotp_remove(struct platform_device *pdev) | |
116 | { | |
117 | struct nvmem_device *nvmem = platform_get_drvdata(pdev); | |
118 | ||
119 | return nvmem_unregister(nvmem); | |
120 | } | |
121 | ||
122 | static struct platform_driver imx_ocotp_driver = { | |
123 | .probe = imx_ocotp_probe, | |
124 | .remove = imx_ocotp_remove, | |
125 | .driver = { | |
126 | .name = "imx_ocotp", | |
127 | .of_match_table = imx_ocotp_dt_ids, | |
128 | }, | |
129 | }; | |
130 | module_platform_driver(imx_ocotp_driver); | |
131 | ||
132 | MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>"); | |
133 | MODULE_DESCRIPTION("i.MX6 OCOTP fuse box driver"); | |
134 | MODULE_LICENSE("GPL v2"); |