cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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srom.c (3661B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
      4 * All rights reserved.
      5 *
      6 * Purpose:Implement functions to access eeprom
      7 *
      8 * Author: Jerry Chen
      9 *
     10 * Date: Jan 29, 2003
     11 *
     12 * Functions:
     13 *      SROMbyReadEmbedded - Embedded read eeprom via MAC
     14 *      SROMbWriteEmbedded - Embedded write eeprom via MAC
     15 *      SROMvRegBitsOn - Set Bits On in eeprom
     16 *      SROMvRegBitsOff - Clear Bits Off in eeprom
     17 *      SROMbIsRegBitsOn - Test if Bits On in eeprom
     18 *      SROMbIsRegBitsOff - Test if Bits Off in eeprom
     19 *      SROMvReadAllContents - Read all contents in eeprom
     20 *      SROMvWriteAllContents - Write all contents in eeprom
     21 *      SROMvReadEtherAddress - Read Ethernet Address in eeprom
     22 *      SROMvWriteEtherAddress - Write Ethernet Address in eeprom
     23 *      SROMvReadSubSysVenId - Read Sub_VID and Sub_SysId in eeprom
     24 *      SROMbAutoLoad - Auto Load eeprom to MAC register
     25 *
     26 * Revision History:
     27 *
     28 */
     29
     30#include "upc.h"
     31#include "mac.h"
     32#include "srom.h"
     33
     34/*---------------------  Static Definitions -------------------------*/
     35
     36/*---------------------  Static Classes  ----------------------------*/
     37
     38/*---------------------  Static Variables  --------------------------*/
     39
     40/*---------------------  Static Functions  --------------------------*/
     41
     42/*---------------------  Export Variables  --------------------------*/
     43
     44/*---------------------  Export Functions  --------------------------*/
     45
     46/*
     47 * Description: Read a byte from EEPROM, by MAC I2C
     48 *
     49 * Parameters:
     50 *  In:
     51 *      iobase          - I/O base address
     52 *      byContntOffset  - address of EEPROM
     53 *  Out:
     54 *      none
     55 *
     56 * Return Value: data read
     57 *
     58 */
     59unsigned char SROMbyReadEmbedded(void __iomem *iobase,
     60				 unsigned char byContntOffset)
     61{
     62	unsigned short wDelay, wNoACK;
     63	unsigned char byWait;
     64	unsigned char byData;
     65	unsigned char byOrg;
     66
     67	byData = 0xFF;
     68	byOrg = ioread8(iobase + MAC_REG_I2MCFG);
     69	/* turn off hardware retry for getting NACK */
     70	iowrite8(byOrg & (~I2MCFG_NORETRY), iobase + MAC_REG_I2MCFG);
     71	for (wNoACK = 0; wNoACK < W_MAX_I2CRETRY; wNoACK++) {
     72		iowrite8(EEP_I2C_DEV_ID, iobase + MAC_REG_I2MTGID);
     73		iowrite8(byContntOffset, iobase + MAC_REG_I2MTGAD);
     74
     75		/* issue read command */
     76		iowrite8(I2MCSR_EEMR, iobase + MAC_REG_I2MCSR);
     77		/* wait DONE be set */
     78		for (wDelay = 0; wDelay < W_MAX_TIMEOUT; wDelay++) {
     79			byWait = ioread8(iobase + MAC_REG_I2MCSR);
     80			if (byWait & (I2MCSR_DONE | I2MCSR_NACK))
     81				break;
     82			udelay(CB_DELAY_LOOP_WAIT);
     83		}
     84		if ((wDelay < W_MAX_TIMEOUT) &&
     85		    (!(byWait & I2MCSR_NACK))) {
     86			break;
     87		}
     88	}
     89	byData = ioread8(iobase + MAC_REG_I2MDIPT);
     90	iowrite8(byOrg, iobase + MAC_REG_I2MCFG);
     91	return byData;
     92}
     93
     94/*
     95 * Description: Read all contents of eeprom to buffer
     96 *
     97 * Parameters:
     98 *  In:
     99 *      iobase          - I/O base address
    100 *  Out:
    101 *      pbyEepromRegs   - EEPROM content Buffer
    102 *
    103 * Return Value: none
    104 *
    105 */
    106void SROMvReadAllContents(void __iomem *iobase, unsigned char *pbyEepromRegs)
    107{
    108	int     ii;
    109
    110	/* ii = Rom Address */
    111	for (ii = 0; ii < EEP_MAX_CONTEXT_SIZE; ii++) {
    112		*pbyEepromRegs = SROMbyReadEmbedded(iobase,
    113						    (unsigned char)ii);
    114		pbyEepromRegs++;
    115	}
    116}
    117
    118/*
    119 * Description: Read Ethernet Address from eeprom to buffer
    120 *
    121 * Parameters:
    122 *  In:
    123 *      iobase          - I/O base address
    124 *  Out:
    125 *      pbyEtherAddress - Ethernet Address buffer
    126 *
    127 * Return Value: none
    128 *
    129 */
    130void SROMvReadEtherAddress(void __iomem *iobase,
    131			   unsigned char *pbyEtherAddress)
    132{
    133	unsigned char ii;
    134
    135	/* ii = Rom Address */
    136	for (ii = 0; ii < ETH_ALEN; ii++) {
    137		*pbyEtherAddress = SROMbyReadEmbedded(iobase, ii);
    138		pbyEtherAddress++;
    139	}
    140}