mips/sgi-ip22/ip22-nvram.c

1 // SPDX-License-Identifier: GPL-2.0
3  * ip22-nvram.c: NVRAM and serial EEPROM handling.
5  * Copyright (C) 2003 Ladislav Michl (ladis@linux-mips.org)
13 #define EEPROM_READ	0xc000	/* serial memory read */
18 #define EEPROM_PRREAD	0xc000	/* read protect register */
31 #define delay() ({						\  macro
39 	delay();						\
61 	ser_cmd = cmd | (reg << (16 - BITS_IN_COMMAND));  in eeprom_cmd()
68 		delay();  in eeprom_cmd()
70 		delay();  in eeprom_cmd()
89 		delay();  in ip22_eeprom_read()
91 		delay();  in ip22_eeprom_read()
105  * Read specified register from main NVRAM
112 		return ip22_eeprom_read(&hpc3c0->eeprom, reg);  in ip22_nvram_read()
117 		tmp = hpc3c0->bbram[reg++] & 0xff;  in ip22_nvram_read()
118 		return (tmp << 8) | (hpc3c0->bbram[reg] & 0xff);  in ip22_nvram_read()