linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * Amlogic Meson6, Meson8 and Meson8b eFuse Driver

 *

 * Copyright (c) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>

 */

​

#include <linux/bitfield.h>

#include <linux/bitops.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/io.h>

#include <linux/iopoll.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/sizes.h>

#include <linux/slab.h>

​

#define MESON_MX_EFUSE_CNTL1                    0x04

#define MESON_MX_EFUSE_CNTL1_PD_ENABLE              BIT(27)

#define MESON_MX_EFUSE_CNTL1_AUTO_RD_BUSY           BIT(26)

#define MESON_MX_EFUSE_CNTL1_AUTO_RD_START          BIT(25)

#define MESON_MX_EFUSE_CNTL1_AUTO_RD_ENABLE         BIT(24)

#define MESON_MX_EFUSE_CNTL1_BYTE_WR_DATA           GENMASK(23, 16)

#define MESON_MX_EFUSE_CNTL1_AUTO_WR_BUSY           BIT(14)

#define MESON_MX_EFUSE_CNTL1_AUTO_WR_START          BIT(13)

#define MESON_MX_EFUSE_CNTL1_AUTO_WR_ENABLE         BIT(12)

#define MESON_MX_EFUSE_CNTL1_BYTE_ADDR_SET          BIT(11)

#define MESON_MX_EFUSE_CNTL1_BYTE_ADDR_MASK         GENMASK(10, 0)

​

#define MESON_MX_EFUSE_CNTL2                    0x08

​

#define MESON_MX_EFUSE_CNTL4                    0x10

#define MESON_MX_EFUSE_CNTL4_ENCRYPT_ENABLE         BIT(10)

​

struct meson_mx_efuse_platform_data {

    const char *name;

    unsigned int word_size;

};

​

struct meson_mx_efuse {

    void __iomem *base;

    struct clk *core_clk;

    struct nvmem_device *nvmem;

    struct nvmem_config config;

};

​

static void meson_mx_efuse_mask_bits(struct meson_mx_efuse *efuse, u32 reg,

                     u32 mask, u32 set)

{

    u32 data;

​

    data = readl(efuse->base + reg);

    data &= ~mask;

    data |= (set & mask);

​

    writel(data, efuse->base + reg);

}

​

static int meson_mx_efuse_hw_enable(struct meson_mx_efuse *efuse)