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  *      byContntOffset  - address of EEPROM
53  *  Out:
54  *      none
55  *
56  * Return Value: data read
57  *
58  */
SROMbyReadEmbedded(void __iomem * iobase,unsigned char byContntOffset)59 unsigned char SROMbyReadEmbedded(void __iomem *iobase,
60 				 unsigned char byContntOffset)
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(byContntOffset, 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