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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation http www opensource org licenses gpl license html http www gnu org copyleft gpl html extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 3 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081201.897982733@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
150 lines
3.1 KiB
C
150 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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};
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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 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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iim->base = devm_platform_ioremap_resource(pdev, 0);
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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(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.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.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 = devm_nvmem_register(dev, &cfg);
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return PTR_ERR_OR_ZERO(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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.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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