mtk-lk/platform/mt6735/mt_efuse.c

/* Copyright Statement:
*
* This software/firmware and related documentation ("MediaTek Software") are
* protected under relevant copyright laws. The information contained herein
* is confidential and proprietary to MediaTek Inc. and/or its licensors.
* Without the prior written permission of MediaTek inc. and/or its licensors,
* any reproduction, modification, use or disclosure of MediaTek Software,
* and information contained herein, in whole or in part, shall be strictly prohibited.
*/
/* MediaTek Inc. (C) 2015. All rights reserved.
*
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* THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
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* The following software/firmware and/or related documentation ("MediaTek Software")
* have been modified by MediaTek Inc. All revisions are subject to any receiver\'s
* applicable license agreements with MediaTek Inc.
*/

#include <stdlib.h>
#include <debug.h>
#include <video.h>
#define EFUSE_PART_NAME     "efuse"
#define CHK_SIZE            20
#define CHK_THRESHOLD       19

#define EFUSE_NONE          0x00
#define EFUSE_FINE          0xAA
#define EFUSE_BROKEN        0x5A
#define EFUSE_REBLOW        0x55

extern int mboot_recovery_load_raw_part(char *part_name, unsigned long *addr, unsigned int size);


static int mboot_efuse_load_misc(unsigned char *misc_addr, unsigned int size)
{
    int ret;

	dprintf(SPEW,"[%s]: size is %u\n", __func__, size);
	dprintf(SPEW,"[%s]: misc_addr is 0x%p\n", __func__, misc_addr);

    ret = mboot_recovery_load_raw_part(EFUSE_PART_NAME, (unsigned long *) misc_addr, size);

    return ret;
}
#ifdef MTK_EFUSE_WRITER_SUPPORT
unsigned int mt_efuse_get(void)
{
    unsigned char *data;
    unsigned char efuse = EFUSE_NONE;
    char *str = "";
    int ret, i, cnt;

    data = malloc(CHK_SIZE);
    if (!data)
    {
        dprintf(CRITICAL, "%s: malloc failed\n", __func__);
        goto fail;
    }

    ret = mboot_efuse_load_misc(data, CHK_SIZE);
    if (ret < 0)
    {
        dprintf(CRITICAL, "%s: read partition failed\n", __func__);
        goto fail;
    }

    switch (data[0]) {
        case EFUSE_FINE:
        case EFUSE_BROKEN:
        case EFUSE_REBLOW:
            efuse = data[0];
            break;
    }

    if (efuse != EFUSE_NONE)
    {
        for (i = cnt = 1; i < CHK_SIZE;i++) {
            if (data[i] == efuse)
                cnt++;
        }

        if (cnt >= CHK_THRESHOLD) {
            if (efuse == EFUSE_FINE)
            {
                str = "success";
            }
            else if (efuse == EFUSE_BROKEN)
            {
                str = "broken";
            }
            else if (efuse == EFUSE_REBLOW)
            {
                str = "reblow";
            }

            video_printf("efuse blow: %s\n", str);
        }
    }

fail:
    if (data)
        free(data);
    return (unsigned int)efuse;
}
#else
unsigned int mt_efuse_get(void)
{
    return 0;
}
#endif