xref: /openbmc/linux/drivers/nvmem/imx-iim.c (revision c900529f3d9161bfde5cca0754f83b4d3c3e0220)
1acee2e8dSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2c066c1c0SMichael Grzeschik /*
3c066c1c0SMichael Grzeschik  * i.MX IIM driver
4c066c1c0SMichael Grzeschik  *
5c066c1c0SMichael Grzeschik  * Copyright (c) 2017 Pengutronix, Michael Grzeschik <m.grzeschik@pengutronix.de>
6c066c1c0SMichael Grzeschik  *
7c066c1c0SMichael Grzeschik  * Based on the barebox iim driver,
8c066c1c0SMichael Grzeschik  * Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>,
9c066c1c0SMichael Grzeschik  *	Orex Computed Radiography
10c066c1c0SMichael Grzeschik  */
11c066c1c0SMichael Grzeschik 
12c066c1c0SMichael Grzeschik #include <linux/device.h>
13c066c1c0SMichael Grzeschik #include <linux/io.h>
14c066c1c0SMichael Grzeschik #include <linux/module.h>
15c066c1c0SMichael Grzeschik #include <linux/nvmem-provider.h>
16c066c1c0SMichael Grzeschik #include <linux/of.h>
17c066c1c0SMichael Grzeschik #include <linux/platform_device.h>
18c066c1c0SMichael Grzeschik #include <linux/slab.h>
19c066c1c0SMichael Grzeschik #include <linux/clk.h>
20c066c1c0SMichael Grzeschik 
21c066c1c0SMichael Grzeschik #define IIM_BANK_BASE(n)	(0x800 + 0x400 * (n))
22c066c1c0SMichael Grzeschik 
23c066c1c0SMichael Grzeschik struct imx_iim_drvdata {
24c066c1c0SMichael Grzeschik 	unsigned int nregs;
25c066c1c0SMichael Grzeschik };
26c066c1c0SMichael Grzeschik 
27c066c1c0SMichael Grzeschik struct iim_priv {
28c066c1c0SMichael Grzeschik 	void __iomem *base;
29c066c1c0SMichael Grzeschik 	struct clk *clk;
30c066c1c0SMichael Grzeschik };
31c066c1c0SMichael Grzeschik 
imx_iim_read(void * context,unsigned int offset,void * buf,size_t bytes)32c066c1c0SMichael Grzeschik static int imx_iim_read(void *context, unsigned int offset,
33c066c1c0SMichael Grzeschik 			  void *buf, size_t bytes)
34c066c1c0SMichael Grzeschik {
35c066c1c0SMichael Grzeschik 	struct iim_priv *iim = context;
36c066c1c0SMichael Grzeschik 	int i, ret;
37c066c1c0SMichael Grzeschik 	u8 *buf8 = buf;
38c066c1c0SMichael Grzeschik 
39c066c1c0SMichael Grzeschik 	ret = clk_prepare_enable(iim->clk);
40c066c1c0SMichael Grzeschik 	if (ret)
41c066c1c0SMichael Grzeschik 		return ret;
42c066c1c0SMichael Grzeschik 
43c066c1c0SMichael Grzeschik 	for (i = offset; i < offset + bytes; i++) {
44c066c1c0SMichael Grzeschik 		int bank = i >> 5;
45c066c1c0SMichael Grzeschik 		int reg = i & 0x1f;
46c066c1c0SMichael Grzeschik 
47c066c1c0SMichael Grzeschik 		*buf8++ = readl(iim->base + IIM_BANK_BASE(bank) + reg * 4);
48c066c1c0SMichael Grzeschik 	}
49c066c1c0SMichael Grzeschik 
50c066c1c0SMichael Grzeschik 	clk_disable_unprepare(iim->clk);
51c066c1c0SMichael Grzeschik 
52c066c1c0SMichael Grzeschik 	return 0;
53c066c1c0SMichael Grzeschik }
54c066c1c0SMichael Grzeschik 
55c066c1c0SMichael Grzeschik static struct imx_iim_drvdata imx27_drvdata = {
56c066c1c0SMichael Grzeschik 	.nregs = 2 * 32,
57c066c1c0SMichael Grzeschik };
58c066c1c0SMichael Grzeschik 
59c066c1c0SMichael Grzeschik static struct imx_iim_drvdata imx25_imx31_imx35_drvdata = {
60c066c1c0SMichael Grzeschik 	.nregs = 3 * 32,
61c066c1c0SMichael Grzeschik };
62c066c1c0SMichael Grzeschik 
63c066c1c0SMichael Grzeschik static struct imx_iim_drvdata imx51_drvdata = {
64c066c1c0SMichael Grzeschik 	.nregs = 4 * 32,
65c066c1c0SMichael Grzeschik };
66c066c1c0SMichael Grzeschik 
67c066c1c0SMichael Grzeschik static struct imx_iim_drvdata imx53_drvdata = {
68c066c1c0SMichael Grzeschik 	.nregs = 4 * 32 + 16,
69c066c1c0SMichael Grzeschik };
70c066c1c0SMichael Grzeschik 
71c066c1c0SMichael Grzeschik static const struct of_device_id imx_iim_dt_ids[] = {
72c066c1c0SMichael Grzeschik 	{
73c066c1c0SMichael Grzeschik 		.compatible = "fsl,imx25-iim",
74c066c1c0SMichael Grzeschik 		.data = &imx25_imx31_imx35_drvdata,
75c066c1c0SMichael Grzeschik 	}, {
76c066c1c0SMichael Grzeschik 		.compatible = "fsl,imx27-iim",
77c066c1c0SMichael Grzeschik 		.data = &imx27_drvdata,
78c066c1c0SMichael Grzeschik 	}, {
79c066c1c0SMichael Grzeschik 		.compatible = "fsl,imx31-iim",
80c066c1c0SMichael Grzeschik 		.data = &imx25_imx31_imx35_drvdata,
81c066c1c0SMichael Grzeschik 	}, {
82c066c1c0SMichael Grzeschik 		.compatible = "fsl,imx35-iim",
83c066c1c0SMichael Grzeschik 		.data = &imx25_imx31_imx35_drvdata,
84c066c1c0SMichael Grzeschik 	}, {
85c066c1c0SMichael Grzeschik 		.compatible = "fsl,imx51-iim",
86c066c1c0SMichael Grzeschik 		.data = &imx51_drvdata,
87c066c1c0SMichael Grzeschik 	}, {
88c066c1c0SMichael Grzeschik 		.compatible = "fsl,imx53-iim",
89c066c1c0SMichael Grzeschik 		.data = &imx53_drvdata,
90c066c1c0SMichael Grzeschik 	}, {
91c066c1c0SMichael Grzeschik 		/* sentinel */
92c066c1c0SMichael Grzeschik 	},
93c066c1c0SMichael Grzeschik };
94c066c1c0SMichael Grzeschik MODULE_DEVICE_TABLE(of, imx_iim_dt_ids);
95c066c1c0SMichael Grzeschik 
imx_iim_probe(struct platform_device * pdev)96c066c1c0SMichael Grzeschik static int imx_iim_probe(struct platform_device *pdev)
97c066c1c0SMichael Grzeschik {
98c066c1c0SMichael Grzeschik 	struct device *dev = &pdev->dev;
99c066c1c0SMichael Grzeschik 	struct iim_priv *iim;
100c066c1c0SMichael Grzeschik 	struct nvmem_device *nvmem;
10101d35cabSMasahiro Yamada 	struct nvmem_config cfg = {};
102c066c1c0SMichael Grzeschik 	const struct imx_iim_drvdata *drvdata = NULL;
103c066c1c0SMichael Grzeschik 
104c066c1c0SMichael Grzeschik 	iim = devm_kzalloc(dev, sizeof(*iim), GFP_KERNEL);
105c066c1c0SMichael Grzeschik 	if (!iim)
106c066c1c0SMichael Grzeschik 		return -ENOMEM;
107c066c1c0SMichael Grzeschik 
108ededa045SAnson Huang 	iim->base = devm_platform_ioremap_resource(pdev, 0);
109c066c1c0SMichael Grzeschik 	if (IS_ERR(iim->base))
110c066c1c0SMichael Grzeschik 		return PTR_ERR(iim->base);
111c066c1c0SMichael Grzeschik 
112*579db09cSFabio Estevam 	drvdata = of_device_get_match_data(&pdev->dev);
113c066c1c0SMichael Grzeschik 
114b28b7381SAndrey Smirnov 	iim->clk = devm_clk_get(dev, NULL);
115c066c1c0SMichael Grzeschik 	if (IS_ERR(iim->clk))
116c066c1c0SMichael Grzeschik 		return PTR_ERR(iim->clk);
117c066c1c0SMichael Grzeschik 
11801d35cabSMasahiro Yamada 	cfg.name = "imx-iim",
11901d35cabSMasahiro Yamada 	cfg.read_only = true,
12001d35cabSMasahiro Yamada 	cfg.word_size = 1,
12101d35cabSMasahiro Yamada 	cfg.stride = 1,
12201d35cabSMasahiro Yamada 	cfg.reg_read = imx_iim_read,
12301d35cabSMasahiro Yamada 	cfg.dev = dev;
12401d35cabSMasahiro Yamada 	cfg.size = drvdata->nregs;
12501d35cabSMasahiro Yamada 	cfg.priv = iim;
126c066c1c0SMichael Grzeschik 
127547a2c9bSAndrey Smirnov 	nvmem = devm_nvmem_register(dev, &cfg);
128c066c1c0SMichael Grzeschik 
129547a2c9bSAndrey Smirnov 	return PTR_ERR_OR_ZERO(nvmem);
130c066c1c0SMichael Grzeschik }
131c066c1c0SMichael Grzeschik 
132c066c1c0SMichael Grzeschik static struct platform_driver imx_iim_driver = {
133c066c1c0SMichael Grzeschik 	.probe	= imx_iim_probe,
134c066c1c0SMichael Grzeschik 	.driver = {
135c066c1c0SMichael Grzeschik 		.name	= "imx-iim",
136c066c1c0SMichael Grzeschik 		.of_match_table = imx_iim_dt_ids,
137c066c1c0SMichael Grzeschik 	},
138c066c1c0SMichael Grzeschik };
139c066c1c0SMichael Grzeschik module_platform_driver(imx_iim_driver);
140c066c1c0SMichael Grzeschik 
141c066c1c0SMichael Grzeschik MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>");
142c066c1c0SMichael Grzeschik MODULE_DESCRIPTION("i.MX IIM driver");
143c066c1c0SMichael Grzeschik MODULE_LICENSE("GPL v2");
144