drivers/staging/vt6655/srom.c

   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 "device.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  *      contnt_offset  - address of EEPROM
  53  *  Out:
  54  *      none
  55  *
  56  * Return Value: data read
  57  *
  58  */
  59 unsigned char SROMbyReadEmbedded(void __iomem *iobase,
  60                                  unsigned char contnt_offset)
  61 {
  62         unsigned short wDelay, wNoACK;
  63         unsigned char byWait;
  64         unsigned char byData;
  65         unsigned char byOrg;
  66
  67         byOrg = ioread8(iobase + MAC_REG_I2MCFG);
  68         /* turn off hardware retry for getting NACK */
  69         iowrite8(byOrg & (~I2MCFG_NORETRY), iobase + MAC_REG_I2MCFG);
  70         for (wNoACK = 0; wNoACK < W_MAX_I2CRETRY; wNoACK++) {
  71                 iowrite8(EEP_I2C_DEV_ID, iobase + MAC_REG_I2MTGID);
  72                 iowrite8(contnt_offset, iobase + MAC_REG_I2MTGAD);
  73
  74                 /* issue read command */
  75                 iowrite8(I2MCSR_EEMR, iobase + MAC_REG_I2MCSR);
  76                 /* wait DONE be set */
  77                 for (wDelay = 0; wDelay < W_MAX_TIMEOUT; wDelay++) {
  78                         byWait = ioread8(iobase + MAC_REG_I2MCSR);
  79                         if (byWait & (I2MCSR_DONE | I2MCSR_NACK))
  80                                 break;
  81                         udelay(CB_DELAY_LOOP_WAIT);
  82                 }
  83                 if ((wDelay < W_MAX_TIMEOUT) &&
  84                     (!(byWait & I2MCSR_NACK))) {
  85                         break;
  86                 }
  87         }
  88         byData = ioread8(iobase + MAC_REG_I2MDIPT);
  89         iowrite8(byOrg, iobase + MAC_REG_I2MCFG);
  90         return byData;
  91 }
  92
  93 /*
  94  * Description: Read all contents of eeprom to buffer
  95  *
  96  * Parameters:
  97  *  In:
  98  *      iobase          - I/O base address
  99  *  Out:
 100  *      pbyEepromRegs   - EEPROM content Buffer
 101  *
 102  * Return Value: none
 103  *
 104  */
 105 void SROMvReadAllContents(void __iomem *iobase, unsigned char *pbyEepromRegs)
 106 {
 107         int     ii;
 108
 109         /* ii = Rom Address */
 110         for (ii = 0; ii < EEP_MAX_CONTEXT_SIZE; ii++) {
 111                 *pbyEepromRegs = SROMbyReadEmbedded(iobase,
 112                                                     (unsigned char)ii);
 113                 pbyEepromRegs++;
 114         }
 115 }
 116
 117 /*
 118  * Description: Read Ethernet Address from eeprom to buffer
 119  *
 120  * Parameters:
 121  *  In:
 122  *      iobase          - I/O base address
 123  *  Out:
 124  *      pbyEtherAddress - Ethernet Address buffer
 125  *
 126  * Return Value: none
 127  *
 128  */
 129 void SROMvReadEtherAddress(void __iomem *iobase,
 130                            unsigned char *pbyEtherAddress)
 131 {
 132         unsigned char ii;
 133
 134         /* ii = Rom Address */
 135         for (ii = 0; ii < ETH_ALEN; ii++) {
 136                 *pbyEtherAddress = SROMbyReadEmbedded(iobase, ii);
 137                 pbyEtherAddress++;
 138         }
 139 }