// SPDX-License-Identifier: GPL-2.0-only /* * i.MX IIM driver * * Copyright (c) 2017 Pengutronix, Michael Grzeschik <m.grzeschik@pengutronix.de> * * Based on the barebox iim driver, * Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>, * Orex Computed Radiography */ #include <linux/device.h> #include <linux/io.h> #include <linux/module.h> #include <linux/nvmem-provider.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/clk.h> #define IIM_BANK_BASE(n) (0x800 + 0x400 * (n)) struct imx_iim_drvdata { unsigned int nregs; }; struct iim_priv { void __iomem *base; struct clk *clk; }; static int imx_iim_read(void *context, unsigned int offset, void *buf, size_t bytes) { struct iim_priv *iim = context; int i, ret; u8 *buf8 = buf; ret = clk_prepare_enable(iim->clk); if (ret) return ret; for (i = offset; i < offset + bytes; i++) { int bank = i >> 5; int reg = i & 0x1f; *buf8++ = readl(iim->base + IIM_BANK_BASE(bank) + reg * 4); } clk_disable_unprepare(iim->clk); return 0; } static struct imx_iim_drvdata imx27_drvdata = { .nregs = 2 * 32, }; static struct imx_iim_drvdata imx25_imx31_imx35_drvdata = { .nregs = 3 * 32, }; static struct imx_iim_drvdata imx51_drvdata = { .nregs = 4 * 32, }; static struct imx_iim_drvdata imx53_drvdata = { .nregs = 4 * 32 + 16, }; static const struct of_device_id imx_iim_dt_ids[] = { { .compatible = "fsl,imx25-iim", .data = &imx25_imx31_imx35_drvdata, }, { .compatible = "fsl,imx27-iim", .data = &imx27_drvdata, }, { .compatible = "fsl,imx31-iim", .data = &imx25_imx31_imx35_drvdata, }, { .compatible = "fsl,imx35-iim", .data = &imx25_imx31_imx35_drvdata, }, { .compatible = "fsl,imx51-iim", .data = &imx51_drvdata, }, { .compatible = "fsl,imx53-iim", .data = &imx53_drvdata, }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, imx_iim_dt_ids); static int imx_iim_probe(struct platform_device *pdev) { const struct of_device_id *of_id; struct device *dev = &pdev->dev; struct iim_priv *iim; struct nvmem_device *nvmem; struct nvmem_config cfg = {}; const struct imx_iim_drvdata *drvdata = NULL; iim = devm_kzalloc(dev, sizeof(*iim), GFP_KERNEL); if (!iim) return -ENOMEM; iim->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(iim->base)) return PTR_ERR(iim->base); of_id = of_match_device(imx_iim_dt_ids, dev); if (!of_id) return -ENODEV; drvdata = of_id->data; iim->clk = devm_clk_get(dev, NULL); if (IS_ERR(iim->clk)) return PTR_ERR(iim->clk); cfg.name = "imx-iim", cfg.read_only = true, cfg.word_size = 1, cfg.stride = 1, cfg.reg_read = imx_iim_read, cfg.dev = dev; cfg.size = drvdata->nregs; cfg.priv = iim; nvmem = devm_nvmem_register(dev, &cfg); return PTR_ERR_OR_ZERO(nvmem); } static struct platform_driver imx_iim_driver = { .probe = imx_iim_probe, .driver = { .name = "imx-iim", .of_match_table = imx_iim_dt_ids, }, }; module_platform_driver(imx_iim_driver); MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>"); MODULE_DESCRIPTION("i.MX IIM driver"); MODULE_LICENSE("GPL v2");