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144 lines
3.0 KiB
144 lines
3.0 KiB
// 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 <[email protected]> |
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* |
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* Based on the barebox iim driver, |
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* Copyright (c) 2010 Baruch Siach <[email protected]>, |
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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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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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drvdata = of_device_get_match_data(&pdev->dev); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("i.MX IIM driver"); |
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MODULE_LICENSE("GPL v2");
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