linux-imx

/*

 * 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

 *

 * 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

 */

​

#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",