4 * Copyright (c) 2017 Pengutronix, Michael Grzeschik <m.grzeschik@pengutronix.de>
6 * Based on the barebox iim driver,
7 * Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>,
8 * Orex Computed Radiography
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.
14 * http://www.opensource.org/licenses/gpl-license.html
15 * http://www.gnu.org/copyleft/gpl.html
18 #include <linux/device.h>
20 #include <linux/module.h>
21 #include <linux/nvmem-provider.h>
23 #include <linux/of_device.h>
24 #include <linux/platform_device.h>
25 #include <linux/slab.h>
26 #include <linux/clk.h>
28 #define IIM_BANK_BASE(n) (0x800 + 0x400 * (n))
30 struct imx_iim_drvdata {
37 struct nvmem_config nvmem;
40 static int imx_iim_read(void *context, unsigned int offset,
41 void *buf, size_t bytes)
43 struct iim_priv *iim = context;
47 ret = clk_prepare_enable(iim->clk);
51 for (i = offset; i < offset + bytes; i++) {
55 *buf8++ = readl(iim->base + IIM_BANK_BASE(bank) + reg * 4);
58 clk_disable_unprepare(iim->clk);
63 static struct imx_iim_drvdata imx27_drvdata = {
67 static struct imx_iim_drvdata imx25_imx31_imx35_drvdata = {
71 static struct imx_iim_drvdata imx51_drvdata = {
75 static struct imx_iim_drvdata imx53_drvdata = {
79 static const struct of_device_id imx_iim_dt_ids[] = {
81 .compatible = "fsl,imx25-iim",
82 .data = &imx25_imx31_imx35_drvdata,
84 .compatible = "fsl,imx27-iim",
85 .data = &imx27_drvdata,
87 .compatible = "fsl,imx31-iim",
88 .data = &imx25_imx31_imx35_drvdata,
90 .compatible = "fsl,imx35-iim",
91 .data = &imx25_imx31_imx35_drvdata,
93 .compatible = "fsl,imx51-iim",
94 .data = &imx51_drvdata,
96 .compatible = "fsl,imx53-iim",
97 .data = &imx53_drvdata,
102 MODULE_DEVICE_TABLE(of, imx_iim_dt_ids);
104 static int imx_iim_probe(struct platform_device *pdev)
106 const struct of_device_id *of_id;
107 struct device *dev = &pdev->dev;
108 struct resource *res;
109 struct iim_priv *iim;
110 struct nvmem_device *nvmem;
111 struct nvmem_config *cfg;
112 const struct imx_iim_drvdata *drvdata = NULL;
114 iim = devm_kzalloc(dev, sizeof(*iim), GFP_KERNEL);
118 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
119 iim->base = devm_ioremap_resource(dev, res);
120 if (IS_ERR(iim->base))
121 return PTR_ERR(iim->base);
123 of_id = of_match_device(imx_iim_dt_ids, dev);
127 drvdata = of_id->data;
129 iim->clk = devm_clk_get(&pdev->dev, NULL);
130 if (IS_ERR(iim->clk))
131 return PTR_ERR(iim->clk);
135 cfg->name = "imx-iim",
136 cfg->read_only = true,
139 cfg->owner = THIS_MODULE,
140 cfg->reg_read = imx_iim_read,
142 cfg->size = drvdata->nregs;
145 nvmem = nvmem_register(cfg);
147 return PTR_ERR(nvmem);
149 platform_set_drvdata(pdev, nvmem);
154 static int imx_iim_remove(struct platform_device *pdev)
156 struct nvmem_device *nvmem = platform_get_drvdata(pdev);
158 return nvmem_unregister(nvmem);
161 static struct platform_driver imx_iim_driver = {
162 .probe = imx_iim_probe,
163 .remove = imx_iim_remove,
166 .of_match_table = imx_iim_dt_ids,
169 module_platform_driver(imx_iim_driver);
171 MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>");
172 MODULE_DESCRIPTION("i.MX IIM driver");
173 MODULE_LICENSE("GPL v2");