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  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * File: srom.c
  20  *
  21  * Purpose:Implement functions to access eeprom
  22  *
  23  * Author: Jerry Chen
  24  *
  25  * Date: Jan 29, 2003
  26  *
  27  * Functions:
  28  *      SROMbyReadEmbedded - Embedded read eeprom via MAC
  29  *      SROMbWriteEmbedded - Embedded write eeprom via MAC
  30  *      SROMvRegBitsOn - Set Bits On in eeprom
  31  *      SROMvRegBitsOff - Clear Bits Off in eeprom
  32  *      SROMbIsRegBitsOn - Test if Bits On in eeprom
  33  *      SROMbIsRegBitsOff - Test if Bits Off in eeprom
  34  *      SROMvReadAllContents - Read all contents in eeprom
  35  *      SROMvWriteAllContents - Write all contents in eeprom
  36  *      SROMvReadEtherAddress - Read Ethernet Address in eeprom
  37  *      SROMvWriteEtherAddress - Write Ethernet Address in eeprom
  38  *      SROMvReadSubSysVenId - Read Sub_VID and Sub_SysId in eeprom
  39  *      SROMbAutoLoad - Auto Load eeprom to MAC register
  40  *
  41  * Revision History:
  42  *
  43  */
  44
  45 #include "upc.h"
  46 #include "tmacro.h"
  47 #include "mac.h"
  48 #include "srom.h"
  49
  50 /*---------------------  Static Definitions -------------------------*/
  51
  52 /*---------------------  Static Classes  ----------------------------*/
  53
  54 /*---------------------  Static Variables  --------------------------*/
  55
  56 /*---------------------  Static Functions  --------------------------*/
  57
  58 /*---------------------  Export Variables  --------------------------*/
  59
  60 /*---------------------  Export Functions  --------------------------*/
  61
  62 /*
  63  * Description: Read a byte from EEPROM, by MAC I2C
  64  *
  65  * Parameters:
  66  *  In:
  67  *      dwIoBase        - I/O base address
  68  *      byContntOffset  - address of EEPROM
  69  *  Out:
  70  *      none
  71  *
  72  * Return Value: data read
  73  *
  74  */
  75 unsigned char SROMbyReadEmbedded(void __iomem *dwIoBase, unsigned char byContntOffset)
  76 {
  77         unsigned short wDelay, wNoACK;
  78         unsigned char byWait;
  79         unsigned char byData;
  80         unsigned char byOrg;
  81
  82         byData = 0xFF;
  83         VNSvInPortB(dwIoBase + MAC_REG_I2MCFG, &byOrg);
  84         /* turn off hardware retry for getting NACK */
  85         VNSvOutPortB(dwIoBase + MAC_REG_I2MCFG, (byOrg & (~I2MCFG_NORETRY)));
  86         for (wNoACK = 0; wNoACK < W_MAX_I2CRETRY; wNoACK++) {
  87                 VNSvOutPortB(dwIoBase + MAC_REG_I2MTGID, EEP_I2C_DEV_ID);
  88                 VNSvOutPortB(dwIoBase + MAC_REG_I2MTGAD, byContntOffset);
  89
  90                 /* issue read command */
  91                 VNSvOutPortB(dwIoBase + MAC_REG_I2MCSR, I2MCSR_EEMR);
  92                 /* wait DONE be set */
  93                 for (wDelay = 0; wDelay < W_MAX_TIMEOUT; wDelay++) {
  94                         VNSvInPortB(dwIoBase + MAC_REG_I2MCSR, &byWait);
  95                         if (byWait & (I2MCSR_DONE | I2MCSR_NACK))
  96                                 break;
  97                         PCAvDelayByIO(CB_DELAY_LOOP_WAIT);
  98                 }
  99                 if ((wDelay < W_MAX_TIMEOUT) &&
 100                     (!(byWait & I2MCSR_NACK))) {
 101                         break;
 102                 }
 103         }
 104         VNSvInPortB(dwIoBase + MAC_REG_I2MDIPT, &byData);
 105         VNSvOutPortB(dwIoBase + MAC_REG_I2MCFG, byOrg);
 106         return byData;
 107 }
 108
 109 /*
 110  * Description: Read all contents of eeprom to buffer
 111  *
 112  * Parameters:
 113  *  In:
 114  *      dwIoBase        - I/O base address
 115  *  Out:
 116  *      pbyEepromRegs   - EEPROM content Buffer
 117  *
 118  * Return Value: none
 119  *
 120  */
 121 void SROMvReadAllContents(void __iomem *dwIoBase, unsigned char *pbyEepromRegs)
 122 {
 123         int     ii;
 124
 125         /* ii = Rom Address */
 126         for (ii = 0; ii < EEP_MAX_CONTEXT_SIZE; ii++) {
 127                 *pbyEepromRegs = SROMbyReadEmbedded(dwIoBase, (unsigned char)ii);
 128                 pbyEepromRegs++;
 129         }
 130 }
 131
 132 /*
 133  * Description: Read Ethernet Address from eeprom to buffer
 134  *
 135  * Parameters:
 136  *  In:
 137  *      dwIoBase        - I/O base address
 138  *  Out:
 139  *      pbyEtherAddress - Ethernet Address buffer
 140  *
 141  * Return Value: none
 142  *
 143  */
 144 void SROMvReadEtherAddress(void __iomem *dwIoBase, unsigned char *pbyEtherAddress)
 145 {
 146         unsigned char ii;
 147
 148         /* ii = Rom Address */
 149         for (ii = 0; ii < ETH_ALEN; ii++) {
 150                 *pbyEtherAddress = SROMbyReadEmbedded(dwIoBase, ii);
 151                 pbyEtherAddress++;
 152         }
 153 }