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 "upc.h"
31 #include "tmacro.h"
32 #include "mac.h"
33 #include "srom.h"
34 
35 /*---------------------  Static Definitions -------------------------*/
36 
37 /*---------------------  Static Classes  ----------------------------*/
38 
39 /*---------------------  Static Variables  --------------------------*/
40 
41 /*---------------------  Static Functions  --------------------------*/
42 
43 /*---------------------  Export Variables  --------------------------*/
44 
45 /*---------------------  Export Functions  --------------------------*/
46 
47 /*
48  * Description: Read a byte from EEPROM, by MAC I2C
49  *
50  * Parameters:
51  *  In:
52  *      iobase          - I/O base address
53  *      byContntOffset  - address of EEPROM
54  *  Out:
55  *      none
56  *
57  * Return Value: data read
58  *
59  */
SROMbyReadEmbedded(void __iomem * iobase,unsigned char byContntOffset)60 unsigned char SROMbyReadEmbedded(void __iomem *iobase,
61 				 unsigned char byContntOffset)
62 {
63 	unsigned short wDelay, wNoACK;
64 	unsigned char byWait;
65 	unsigned char byData;
66 	unsigned char byOrg;
67 
68 	byData = 0xFF;
69 	VNSvInPortB(iobase + MAC_REG_I2MCFG, &byOrg);
70 	/* turn off hardware retry for getting NACK */
71 	VNSvOutPortB(iobase + MAC_REG_I2MCFG, (byOrg & (~I2MCFG_NORETRY)));
72 	for (wNoACK = 0; wNoACK < W_MAX_I2CRETRY; wNoACK++) {
73 		VNSvOutPortB(iobase + MAC_REG_I2MTGID, EEP_I2C_DEV_ID);
74 		VNSvOutPortB(iobase + MAC_REG_I2MTGAD, byContntOffset);
75 
76 		/* issue read command */
77 		VNSvOutPortB(iobase + MAC_REG_I2MCSR, I2MCSR_EEMR);
78 		/* wait DONE be set */
79 		for (wDelay = 0; wDelay < W_MAX_TIMEOUT; wDelay++) {
80 			VNSvInPortB(iobase + MAC_REG_I2MCSR, &byWait);
81 			if (byWait & (I2MCSR_DONE | I2MCSR_NACK))
82 				break;
83 			PCAvDelayByIO(CB_DELAY_LOOP_WAIT);
84 		}
85 		if ((wDelay < W_MAX_TIMEOUT) &&
86 		    (!(byWait & I2MCSR_NACK))) {
87 			break;
88 		}
89 	}
90 	VNSvInPortB(iobase + MAC_REG_I2MDIPT, &byData);
91 	VNSvOutPortB(iobase + MAC_REG_I2MCFG, byOrg);
92 	return byData;
93 }
94 
95 /*
96  * Description: Read all contents of eeprom to buffer
97  *
98  * Parameters:
99  *  In:
100  *      iobase          - I/O base address
101  *  Out:
102  *      pbyEepromRegs   - EEPROM content Buffer
103  *
104  * Return Value: none
105  *
106  */
SROMvReadAllContents(void __iomem * iobase,unsigned char * pbyEepromRegs)107 void SROMvReadAllContents(void __iomem *iobase, unsigned char *pbyEepromRegs)
108 {
109 	int     ii;
110 
111 	/* ii = Rom Address */
112 	for (ii = 0; ii < EEP_MAX_CONTEXT_SIZE; ii++) {
113 		*pbyEepromRegs = SROMbyReadEmbedded(iobase,
114 						    (unsigned char)ii);
115 		pbyEepromRegs++;
116 	}
117 }
118 
119 /*
120  * Description: Read Ethernet Address from eeprom to buffer
121  *
122  * Parameters:
123  *  In:
124  *      iobase          - I/O base address
125  *  Out:
126  *      pbyEtherAddress - Ethernet Address buffer
127  *
128  * Return Value: none
129  *
130  */
SROMvReadEtherAddress(void __iomem * iobase,unsigned char * pbyEtherAddress)131 void SROMvReadEtherAddress(void __iomem *iobase,
132 			   unsigned char *pbyEtherAddress)
133 {
134 	unsigned char ii;
135 
136 	/* ii = Rom Address */
137 	for (ii = 0; ii < ETH_ALEN; ii++) {
138 		*pbyEtherAddress = SROMbyReadEmbedded(iobase, ii);
139 		pbyEtherAddress++;
140 	}
141 }
142