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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2007 - 2011 Realtek Corporation. */
#define _RTW_EFUSE_C_
#include "../include/osdep_service.h"
#include "../include/drv_types.h"
#include "../include/rtw_efuse.h"
#include "../include/rtl8188e_hal.h"
/* */
/* Description: */
/* Execute E-Fuse read byte operation. */
/* Referred from SD1 Richard. */
/* */
/* Assumption: */
/* 1. Boot from E-Fuse and successfully auto-load. */
/* 2. PASSIVE_LEVEL (USB interface) */
/* */
/* Created by Roger, 2008.10.21. */
/* */
void
ReadEFuseByte(
struct adapter *Adapter,
u16 _offset,
u8 *pbuf)
{
u32 value32;
u8 readbyte;
u16 retry;
int res;
/* Write Address */
rtw_write8(Adapter, EFUSE_CTRL + 1, (_offset & 0xff));
res = rtw_read8(Adapter, EFUSE_CTRL + 2, &readbyte);
if (res)
return;
rtw_write8(Adapter, EFUSE_CTRL + 2, ((_offset >> 8) & 0x03) | (readbyte & 0xfc));
/* Write bit 32 0 */
res = rtw_read8(Adapter, EFUSE_CTRL + 3, &readbyte);
if (res)
return;
rtw_write8(Adapter, EFUSE_CTRL + 3, (readbyte & 0x7f));
/* Check bit 32 read-ready */
res = rtw_read32(Adapter, EFUSE_CTRL, &value32);
if (res)
return;
for (retry = 0; retry < 10000; retry++) {
res = rtw_read32(Adapter, EFUSE_CTRL, &value32);
if (res)
continue;
if (((value32 >> 24) & 0xff) & 0x80)
break;
}
/* 20100205 Joseph: Add delay suggested by SD1 Victor. */
/* This fix the problem that Efuse read error in high temperature condition. */
/* Designer says that there shall be some delay after ready bit is set, or the */
/* result will always stay on last data we read. */
udelay(50);
res = rtw_read32(Adapter, EFUSE_CTRL, &value32);
if (res)
return;
*pbuf = (u8)(value32 & 0xff);
/* FIXME: return an error to caller */
}
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