mirror of https://gitee.com/openkylin/linux.git
174 lines
3.7 KiB
C
174 lines
3.7 KiB
C
/*
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* i.MX IIM driver
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*
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* Copyright (c) 2017 Pengutronix, Michael Grzeschik <m.grzeschik@pengutronix.de>
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*
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* Based on the barebox iim driver,
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* Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>,
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* Orex Computed Radiography
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#define IIM_BANK_BASE(n) (0x800 + 0x400 * (n))
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struct imx_iim_drvdata {
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unsigned int nregs;
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};
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struct iim_priv {
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void __iomem *base;
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struct clk *clk;
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struct nvmem_config nvmem;
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};
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static int imx_iim_read(void *context, unsigned int offset,
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void *buf, size_t bytes)
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{
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struct iim_priv *iim = context;
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int i, ret;
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u8 *buf8 = buf;
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ret = clk_prepare_enable(iim->clk);
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if (ret)
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return ret;
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for (i = offset; i < offset + bytes; i++) {
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int bank = i >> 5;
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int reg = i & 0x1f;
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*buf8++ = readl(iim->base + IIM_BANK_BASE(bank) + reg * 4);
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}
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clk_disable_unprepare(iim->clk);
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return 0;
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}
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static struct imx_iim_drvdata imx27_drvdata = {
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.nregs = 2 * 32,
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};
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static struct imx_iim_drvdata imx25_imx31_imx35_drvdata = {
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.nregs = 3 * 32,
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};
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static struct imx_iim_drvdata imx51_drvdata = {
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.nregs = 4 * 32,
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};
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static struct imx_iim_drvdata imx53_drvdata = {
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.nregs = 4 * 32 + 16,
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};
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static const struct of_device_id imx_iim_dt_ids[] = {
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{
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.compatible = "fsl,imx25-iim",
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.data = &imx25_imx31_imx35_drvdata,
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}, {
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.compatible = "fsl,imx27-iim",
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.data = &imx27_drvdata,
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}, {
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.compatible = "fsl,imx31-iim",
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.data = &imx25_imx31_imx35_drvdata,
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}, {
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.compatible = "fsl,imx35-iim",
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.data = &imx25_imx31_imx35_drvdata,
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}, {
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.compatible = "fsl,imx51-iim",
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.data = &imx51_drvdata,
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}, {
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.compatible = "fsl,imx53-iim",
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.data = &imx53_drvdata,
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}, {
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/* sentinel */
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},
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};
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MODULE_DEVICE_TABLE(of, imx_iim_dt_ids);
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static int imx_iim_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id;
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct iim_priv *iim;
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struct nvmem_device *nvmem;
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struct nvmem_config *cfg;
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const struct imx_iim_drvdata *drvdata = NULL;
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iim = devm_kzalloc(dev, sizeof(*iim), GFP_KERNEL);
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if (!iim)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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iim->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(iim->base))
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return PTR_ERR(iim->base);
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of_id = of_match_device(imx_iim_dt_ids, dev);
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if (!of_id)
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return -ENODEV;
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drvdata = of_id->data;
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iim->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(iim->clk))
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return PTR_ERR(iim->clk);
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cfg = &iim->nvmem;
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cfg->name = "imx-iim",
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cfg->read_only = true,
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cfg->word_size = 1,
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cfg->stride = 1,
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cfg->owner = THIS_MODULE,
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cfg->reg_read = imx_iim_read,
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cfg->dev = dev;
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cfg->size = drvdata->nregs;
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cfg->priv = iim;
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nvmem = nvmem_register(cfg);
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if (IS_ERR(nvmem))
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return PTR_ERR(nvmem);
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platform_set_drvdata(pdev, nvmem);
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return 0;
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}
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static int imx_iim_remove(struct platform_device *pdev)
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{
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struct nvmem_device *nvmem = platform_get_drvdata(pdev);
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return nvmem_unregister(nvmem);
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}
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static struct platform_driver imx_iim_driver = {
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.probe = imx_iim_probe,
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.remove = imx_iim_remove,
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.driver = {
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.name = "imx-iim",
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.of_match_table = imx_iim_dt_ids,
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},
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};
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module_platform_driver(imx_iim_driver);
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MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>");
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MODULE_DESCRIPTION("i.MX IIM driver");
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MODULE_LICENSE("GPL v2");
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