1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* drivers/atm/zeprom.h - ZeitNet ZN122x EEPROM (NM93C46) declarations */
3 
4 /* Written 1995,1996 by Werner Almesberger, EPFL LRC */
5 
6 
7 #ifndef DRIVER_ATM_ZEPROM_H
8 #define DRIVER_ATM_ZEPROM_H
9 
10 /* Different versions use different control registers */
11 
12 #define ZEPROM_V1_REG	PCI_VENDOR_ID	/* PCI register */
13 #define ZEPROM_V2_REG	0x40
14 
15 /* Bits in control register */
16 
17 #define ZEPROM_SK	0x80000000	/* strobe (probably on raising edge) */
18 #define ZEPROM_CS	0x40000000	/* Chip Select */
19 #define ZEPROM_DI	0x20000000	/* Data Input */
20 #define ZEPROM_DO	0x10000000	/* Data Output */
21 
22 #define ZEPROM_SIZE	32		/* 32 bytes */
23 #define ZEPROM_V1_ESI_OFF 24		/* ESI offset in EEPROM (V1) */
24 #define ZEPROM_V2_ESI_OFF 4		/* ESI offset in EEPROM (V2) */
25 
26 #define ZEPROM_CMD_LEN	3		/* commands are three bits */
27 #define ZEPROM_ADDR_LEN	6		/* addresses are six bits */
28 
29 /* Commands (3 bits) */
30 
31 #define ZEPROM_CMD_READ	6
32 
33 /* No other commands are needed. */
34 
35 #endif
36