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c066c1c0 MG |
1 | /* |
2 | * i.MX IIM driver | |
3 | * | |
4 | * Copyright (c) 2017 Pengutronix, Michael Grzeschik <m.grzeschik@pengutronix.de> | |
5 | * | |
6 | * Based on the barebox iim 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> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/clk.h> | |
27 | ||
28 | #define IIM_BANK_BASE(n) (0x800 + 0x400 * (n)) | |
29 | ||
30 | struct imx_iim_drvdata { | |
31 | unsigned int nregs; | |
32 | }; | |
33 | ||
34 | struct iim_priv { | |
35 | void __iomem *base; | |
36 | struct clk *clk; | |
c066c1c0 MG |
37 | }; |
38 | ||
39 | static int imx_iim_read(void *context, unsigned int offset, | |
40 | void *buf, size_t bytes) | |
41 | { | |
42 | struct iim_priv *iim = context; | |
43 | int i, ret; | |
44 | u8 *buf8 = buf; | |
45 | ||
46 | ret = clk_prepare_enable(iim->clk); | |
47 | if (ret) | |
48 | return ret; | |
49 | ||
50 | for (i = offset; i < offset + bytes; i++) { | |
51 | int bank = i >> 5; | |
52 | int reg = i & 0x1f; | |
53 | ||
54 | *buf8++ = readl(iim->base + IIM_BANK_BASE(bank) + reg * 4); | |
55 | } | |
56 | ||
57 | clk_disable_unprepare(iim->clk); | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | static struct imx_iim_drvdata imx27_drvdata = { | |
63 | .nregs = 2 * 32, | |
64 | }; | |
65 | ||
66 | static struct imx_iim_drvdata imx25_imx31_imx35_drvdata = { | |
67 | .nregs = 3 * 32, | |
68 | }; | |
69 | ||
70 | static struct imx_iim_drvdata imx51_drvdata = { | |
71 | .nregs = 4 * 32, | |
72 | }; | |
73 | ||
74 | static struct imx_iim_drvdata imx53_drvdata = { | |
75 | .nregs = 4 * 32 + 16, | |
76 | }; | |
77 | ||
78 | static const struct of_device_id imx_iim_dt_ids[] = { | |
79 | { | |
80 | .compatible = "fsl,imx25-iim", | |
81 | .data = &imx25_imx31_imx35_drvdata, | |
82 | }, { | |
83 | .compatible = "fsl,imx27-iim", | |
84 | .data = &imx27_drvdata, | |
85 | }, { | |
86 | .compatible = "fsl,imx31-iim", | |
87 | .data = &imx25_imx31_imx35_drvdata, | |
88 | }, { | |
89 | .compatible = "fsl,imx35-iim", | |
90 | .data = &imx25_imx31_imx35_drvdata, | |
91 | }, { | |
92 | .compatible = "fsl,imx51-iim", | |
93 | .data = &imx51_drvdata, | |
94 | }, { | |
95 | .compatible = "fsl,imx53-iim", | |
96 | .data = &imx53_drvdata, | |
97 | }, { | |
98 | /* sentinel */ | |
99 | }, | |
100 | }; | |
101 | MODULE_DEVICE_TABLE(of, imx_iim_dt_ids); | |
102 | ||
103 | static int imx_iim_probe(struct platform_device *pdev) | |
104 | { | |
105 | const struct of_device_id *of_id; | |
106 | struct device *dev = &pdev->dev; | |
107 | struct resource *res; | |
108 | struct iim_priv *iim; | |
109 | struct nvmem_device *nvmem; | |
01d35cab | 110 | struct nvmem_config cfg = {}; |
c066c1c0 MG |
111 | const struct imx_iim_drvdata *drvdata = NULL; |
112 | ||
113 | iim = devm_kzalloc(dev, sizeof(*iim), GFP_KERNEL); | |
114 | if (!iim) | |
115 | return -ENOMEM; | |
116 | ||
117 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
118 | iim->base = devm_ioremap_resource(dev, res); | |
119 | if (IS_ERR(iim->base)) | |
120 | return PTR_ERR(iim->base); | |
121 | ||
122 | of_id = of_match_device(imx_iim_dt_ids, dev); | |
123 | if (!of_id) | |
124 | return -ENODEV; | |
125 | ||
126 | drvdata = of_id->data; | |
127 | ||
128 | iim->clk = devm_clk_get(&pdev->dev, NULL); | |
129 | if (IS_ERR(iim->clk)) | |
130 | return PTR_ERR(iim->clk); | |
131 | ||
01d35cab MY |
132 | cfg.name = "imx-iim", |
133 | cfg.read_only = true, | |
134 | cfg.word_size = 1, | |
135 | cfg.stride = 1, | |
01d35cab MY |
136 | cfg.reg_read = imx_iim_read, |
137 | cfg.dev = dev; | |
138 | cfg.size = drvdata->nregs; | |
139 | cfg.priv = iim; | |
140 | ||
141 | nvmem = nvmem_register(&cfg); | |
c066c1c0 MG |
142 | if (IS_ERR(nvmem)) |
143 | return PTR_ERR(nvmem); | |
144 | ||
145 | platform_set_drvdata(pdev, nvmem); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | static int imx_iim_remove(struct platform_device *pdev) | |
151 | { | |
152 | struct nvmem_device *nvmem = platform_get_drvdata(pdev); | |
153 | ||
154 | return nvmem_unregister(nvmem); | |
155 | } | |
156 | ||
157 | static struct platform_driver imx_iim_driver = { | |
158 | .probe = imx_iim_probe, | |
159 | .remove = imx_iim_remove, | |
160 | .driver = { | |
161 | .name = "imx-iim", | |
162 | .of_match_table = imx_iim_dt_ids, | |
163 | }, | |
164 | }; | |
165 | module_platform_driver(imx_iim_driver); | |
166 | ||
167 | MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>"); | |
168 | MODULE_DESCRIPTION("i.MX IIM driver"); | |
169 | MODULE_LICENSE("GPL v2"); |