1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_SPI_EEPROM_H
3#define __LINUX_SPI_EEPROM_H
4
5#include <linux/memory.h>
6
7/*
8 * Put one of these structures in platform_data for SPI EEPROMS handled
9 * by the "at25" driver.  On SPI, most EEPROMS understand the same core
10 * command set.  If you need to support EEPROMs that don't yet fit, add
11 * flags to support those protocol options.  These values all come from
12 * the chip datasheets.
13 */
14struct spi_eeprom {
15	u32		byte_len;
16	char		name[10];
17	u32		page_size;		/* for writes */
18	u16		flags;
19#define	EE_ADDR1	0x0001			/*  8 bit addrs */
20#define	EE_ADDR2	0x0002			/* 16 bit addrs */
21#define	EE_ADDR3	0x0004			/* 24 bit addrs */
22#define	EE_READONLY	0x0008			/* disallow writes */
23
24	/*
25	 * Certain EEPROMS have a size that is larger than the number of address
26	 * bytes would allow (e.g. like M95040 from ST that has 512 Byte size
27	 * but uses only one address byte (A0 to A7) for addressing.) For
28	 * the extra address bit (A8, A16 or A24) bit 3 of the instruction byte
29	 * is used. This instruction bit is normally defined as don't care for
30	 * other AT25 like chips.
31	 */
32#define EE_INSTR_BIT3_IS_ADDR	0x0010
33
34	void *context;
35};
36
37#endif /* __LINUX_SPI_EEPROM_H */
38