staging/vt6655/srom.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
0004  * All rights reserved.
0005  *
0006  * Purpose:Implement functions to access eeprom
0007  *
0008  * Author: Jerry Chen
0009  *
0010  * Date: Jan 29, 2003
0011  *
0012  * Functions:
0013  *      SROMbyReadEmbedded - Embedded read eeprom via MAC
0014  *      SROMbWriteEmbedded - Embedded write eeprom via MAC
0015  *      SROMvRegBitsOn - Set Bits On in eeprom
0016  *      SROMvRegBitsOff - Clear Bits Off in eeprom
0017  *      SROMbIsRegBitsOn - Test if Bits On in eeprom
0018  *      SROMbIsRegBitsOff - Test if Bits Off in eeprom
0019  *      SROMvReadAllContents - Read all contents in eeprom
0020  *      SROMvWriteAllContents - Write all contents in eeprom
0021  *      SROMvReadEtherAddress - Read Ethernet Address in eeprom
0022  *      SROMvWriteEtherAddress - Write Ethernet Address in eeprom
0023  *      SROMvReadSubSysVenId - Read Sub_VID and Sub_SysId in eeprom
0024  *      SROMbAutoLoad - Auto Load eeprom to MAC register
0025  *
0026  * Revision History:
0027  *
0028  */
0029
0030 #include "device.h"
0031 #include "mac.h"
0032 #include "srom.h"
0033
0034 /*---------------------  Static Definitions -------------------------*/
0035
0036 /*---------------------  Static Classes  ----------------------------*/
0037
0038 /*---------------------  Static Variables  --------------------------*/
0039
0040 /*---------------------  Static Functions  --------------------------*/
0041
0042 /*---------------------  Export Variables  --------------------------*/
0043
0044 /*---------------------  Export Functions  --------------------------*/
0045
0046 /*
0047  * Description: Read a byte from EEPROM, by MAC I2C
0048  *
0049  * Parameters:
0050  *  In:
0051  *      iobase          - I/O base address
0052  *      byContntOffset  - address of EEPROM
0053  *  Out:
0054  *      none
0055  *
0056  * Return Value: data read
0057  *
0058  */
0059 unsigned char SROMbyReadEmbedded(void __iomem *iobase,
0060                  unsigned char byContntOffset)
0061 {
0062     unsigned short wDelay, wNoACK;
0063     unsigned char byWait;
0064     unsigned char byData;
0065     unsigned char byOrg;
0066
0067     byData = 0xFF;
0068     byOrg = ioread8(iobase + MAC_REG_I2MCFG);
0069     /* turn off hardware retry for getting NACK */
0070     iowrite8(byOrg & (~I2MCFG_NORETRY), iobase + MAC_REG_I2MCFG);
0071     for (wNoACK = 0; wNoACK < W_MAX_I2CRETRY; wNoACK++) {
0072         iowrite8(EEP_I2C_DEV_ID, iobase + MAC_REG_I2MTGID);
0073         iowrite8(byContntOffset, iobase + MAC_REG_I2MTGAD);
0074
0075         /* issue read command */
0076         iowrite8(I2MCSR_EEMR, iobase + MAC_REG_I2MCSR);
0077         /* wait DONE be set */
0078         for (wDelay = 0; wDelay < W_MAX_TIMEOUT; wDelay++) {
0079             byWait = ioread8(iobase + MAC_REG_I2MCSR);
0080             if (byWait & (I2MCSR_DONE | I2MCSR_NACK))
0081                 break;
0082             udelay(CB_DELAY_LOOP_WAIT);
0083         }
0084         if ((wDelay < W_MAX_TIMEOUT) &&
0085             (!(byWait & I2MCSR_NACK))) {
0086             break;
0087         }
0088     }
0089     byData = ioread8(iobase + MAC_REG_I2MDIPT);
0090     iowrite8(byOrg, iobase + MAC_REG_I2MCFG);
0091     return byData;
0092 }
0093
0094 /*
0095  * Description: Read all contents of eeprom to buffer
0096  *
0097  * Parameters:
0098  *  In:
0099  *      iobase          - I/O base address
0100  *  Out:
0101  *      pbyEepromRegs   - EEPROM content Buffer
0102  *
0103  * Return Value: none
0104  *
0105  */
0106 void SROMvReadAllContents(void __iomem *iobase, unsigned char *pbyEepromRegs)
0107 {
0108     int     ii;
0109
0110     /* ii = Rom Address */
0111     for (ii = 0; ii < EEP_MAX_CONTEXT_SIZE; ii++) {
0112         *pbyEepromRegs = SROMbyReadEmbedded(iobase,
0113                             (unsigned char)ii);
0114         pbyEepromRegs++;
0115     }
0116 }
0117
0118 /*
0119  * Description: Read Ethernet Address from eeprom to buffer
0120  *
0121  * Parameters:
0122  *  In:
0123  *      iobase          - I/O base address
0124  *  Out:
0125  *      pbyEtherAddress - Ethernet Address buffer
0126  *
0127  * Return Value: none
0128  *
0129  */
0130 void SROMvReadEtherAddress(void __iomem *iobase,
0131                unsigned char *pbyEtherAddress)
0132 {
0133     unsigned char ii;
0134
0135     /* ii = Rom Address */
0136     for (ii = 0; ii < ETH_ALEN; ii++) {
0137         *pbyEtherAddress = SROMbyReadEmbedded(iobase, ii);
0138         pbyEtherAddress++;
0139     }
0140 }