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 */
SROMbyReadEmbedded(void __iomem * iobase,unsigned char contnt_offset)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 */
SROMvReadAllContents(void __iomem * iobase,unsigned char * pbyEepromRegs)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 */
SROMvReadEtherAddress(void __iomem * iobase,unsigned char * pbyEtherAddress)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