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 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(contnt_offset, 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 */ 106 void 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 */ 130 void 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 } 141