drivers/staging/vt6655/srom.c

   1 /*
   2  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * File: srom.c
  16  *
  17  * Purpose:Implement functions to access eeprom
  18  *
  19  * Author: Jerry Chen
  20  *
  21  * Date: Jan 29, 2003
  22  *
  23  * Functions:
  24  *      SROMbyReadEmbedded - Embedded read eeprom via MAC
  25  *      SROMbWriteEmbedded - Embedded write eeprom via MAC
  26  *      SROMvRegBitsOn - Set Bits On in eeprom
  27  *      SROMvRegBitsOff - Clear Bits Off in eeprom
  28  *      SROMbIsRegBitsOn - Test if Bits On in eeprom
  29  *      SROMbIsRegBitsOff - Test if Bits Off in eeprom
  30  *      SROMvReadAllContents - Read all contents in eeprom
  31  *      SROMvWriteAllContents - Write all contents in eeprom
  32  *      SROMvReadEtherAddress - Read Ethernet Address in eeprom
  33  *      SROMvWriteEtherAddress - Write Ethernet Address in eeprom
  34  *      SROMvReadSubSysVenId - Read Sub_VID and Sub_SysId in eeprom
  35  *      SROMbAutoLoad - Auto Load eeprom to MAC register
  36  *
  37  * Revision History:
  38  *
  39  */
  40
  41 #include "upc.h"
  42 #include "tmacro.h"
  43 #include "mac.h"
  44 #include "srom.h"
  45
  46 /*---------------------  Static Definitions -------------------------*/
  47
  48 /*---------------------  Static Classes  ----------------------------*/
  49
  50 /*---------------------  Static Variables  --------------------------*/
  51
  52 /*---------------------  Static Functions  --------------------------*/
  53
  54 /*---------------------  Export Variables  --------------------------*/
  55
  56 /*---------------------  Export Functions  --------------------------*/
  57
  58 /*
  59  * Description: Read a byte from EEPROM, by MAC I2C
  60  *
  61  * Parameters:
  62  *  In:
  63  *      iobase          - I/O base address
  64  *      byContntOffset  - address of EEPROM
  65  *  Out:
  66  *      none
  67  *
  68  * Return Value: data read
  69  *
  70  */
  71 unsigned char SROMbyReadEmbedded(void __iomem *iobase,
  72                                  unsigned char byContntOffset)
  73 {
  74         unsigned short wDelay, wNoACK;
  75         unsigned char byWait;
  76         unsigned char byData;
  77         unsigned char byOrg;
  78
  79         byData = 0xFF;
  80         VNSvInPortB(iobase + MAC_REG_I2MCFG, &byOrg);
  81         /* turn off hardware retry for getting NACK */
  82         VNSvOutPortB(iobase + MAC_REG_I2MCFG, (byOrg & (~I2MCFG_NORETRY)));
  83         for (wNoACK = 0; wNoACK < W_MAX_I2CRETRY; wNoACK++) {
  84                 VNSvOutPortB(iobase + MAC_REG_I2MTGID, EEP_I2C_DEV_ID);
  85                 VNSvOutPortB(iobase + MAC_REG_I2MTGAD, byContntOffset);
  86
  87                 /* issue read command */
  88                 VNSvOutPortB(iobase + MAC_REG_I2MCSR, I2MCSR_EEMR);
  89                 /* wait DONE be set */
  90                 for (wDelay = 0; wDelay < W_MAX_TIMEOUT; wDelay++) {
  91                         VNSvInPortB(iobase + MAC_REG_I2MCSR, &byWait);
  92                         if (byWait & (I2MCSR_DONE | I2MCSR_NACK))
  93                                 break;
  94                         PCAvDelayByIO(CB_DELAY_LOOP_WAIT);
  95                 }
  96                 if ((wDelay < W_MAX_TIMEOUT) &&
  97                     (!(byWait & I2MCSR_NACK))) {
  98                         break;
  99                 }
 100         }
 101         VNSvInPortB(iobase + MAC_REG_I2MDIPT, &byData);
 102         VNSvOutPortB(iobase + MAC_REG_I2MCFG, byOrg);
 103         return byData;
 104 }
 105
 106 /*
 107  * Description: Read all contents of eeprom to buffer
 108  *
 109  * Parameters:
 110  *  In:
 111  *      iobase          - I/O base address
 112  *  Out:
 113  *      pbyEepromRegs   - EEPROM content Buffer
 114  *
 115  * Return Value: none
 116  *
 117  */
 118 void SROMvReadAllContents(void __iomem *iobase, unsigned char *pbyEepromRegs)
 119 {
 120         int     ii;
 121
 122         /* ii = Rom Address */
 123         for (ii = 0; ii < EEP_MAX_CONTEXT_SIZE; ii++) {
 124                 *pbyEepromRegs = SROMbyReadEmbedded(iobase,
 125                                                     (unsigned char)ii);
 126                 pbyEepromRegs++;
 127         }
 128 }
 129
 130 /*
 131  * Description: Read Ethernet Address from eeprom to buffer
 132  *
 133  * Parameters:
 134  *  In:
 135  *      iobase          - I/O base address
 136  *  Out:
 137  *      pbyEtherAddress - Ethernet Address buffer
 138  *
 139  * Return Value: none
 140  *
 141  */
 142 void SROMvReadEtherAddress(void __iomem *iobase,
 143                            unsigned char *pbyEtherAddress)
 144 {
 145         unsigned char ii;
 146
 147         /* ii = Rom Address */
 148         for (ii = 0; ii < ETH_ALEN; ii++) {
 149                 *pbyEtherAddress = SROMbyReadEmbedded(iobase, ii);
 150                 pbyEtherAddress++;
 151         }
 152 }