linux-imx

/*

 * Amlogic Meson GX eFuse Driver

 *

 * Copyright (c) 2016 Endless Computers, Inc.

 * Author: Carlo Caione <carlo@endlessm.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for

 * more details.

 */

​

#include <linux/clk.h>

#include <linux/module.h>

#include <linux/nvmem-provider.h>

#include <linux/of.h>

#include <linux/platform_device.h>

​

#include <linux/firmware/meson/meson_sm.h>

​

static int meson_efuse_read(void *context, unsigned int offset,

                void *val, size_t bytes)

{

    return meson_sm_call_read((u8 *)val, bytes, SM_EFUSE_READ, offset,

                  bytes, 0, 0, 0);

}

​

static int meson_efuse_write(void *context, unsigned int offset,

                 void *val, size_t bytes)

{

    return meson_sm_call_write((u8 *)val, bytes, SM_EFUSE_WRITE, offset,

                   bytes, 0, 0, 0);

}

​

static const struct of_device_id meson_efuse_match[] = {

    { .compatible = "amlogic,meson-gxbb-efuse", },

    { /* sentinel */ },

};

MODULE_DEVICE_TABLE(of, meson_efuse_match);

​

static int meson_efuse_probe(struct platform_device *pdev)

{

    struct device *dev = &pdev->dev;

    struct nvmem_device *nvmem;

    struct nvmem_config *econfig;

    struct clk *clk;

    unsigned int size;

    int ret;

​

    clk = devm_clk_get(dev, NULL);

    if (IS_ERR(clk)) {

        ret = PTR_ERR(clk);

        if (ret != -EPROBE_DEFER)

            dev_err(dev, "failed to get efuse gate");

        return ret;

    }

​

    ret = clk_prepare_enable(clk);

    if (ret) {