xref: /openbmc/linux/include/linux/eeprom_93cx6.h (revision 1a59d1b8)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 	Copyright (C) 2004 - 2006 rt2x00 SourceForge Project
4 	<http://rt2x00.serialmonkey.com>
5 
6  */
7 
8 /*
9 	Module: eeprom_93cx6
10 	Abstract: EEPROM reader datastructures for 93cx6 chipsets.
11 	Supported chipsets: 93c46, 93c56 and 93c66.
12  */
13 
14 /*
15  * EEPROM operation defines.
16  */
17 #define PCI_EEPROM_WIDTH_93C46	6
18 #define PCI_EEPROM_WIDTH_93C56	8
19 #define PCI_EEPROM_WIDTH_93C66	8
20 #define PCI_EEPROM_WIDTH_93C86	8
21 #define PCI_EEPROM_WIDTH_OPCODE	3
22 #define PCI_EEPROM_WRITE_OPCODE	0x05
23 #define PCI_EEPROM_ERASE_OPCODE 0x07
24 #define PCI_EEPROM_READ_OPCODE	0x06
25 #define PCI_EEPROM_EWDS_OPCODE	0x10
26 #define PCI_EEPROM_EWEN_OPCODE	0x13
27 
28 /**
29  * struct eeprom_93cx6 - control structure for setting the commands
30  * for reading the eeprom data.
31  * @data: private pointer for the driver.
32  * @register_read(struct eeprom_93cx6 *eeprom): handler to
33  * read the eeprom register, this function should set all reg_* fields.
34  * @register_write(struct eeprom_93cx6 *eeprom): handler to
35  * write to the eeprom register by using all reg_* fields.
36  * @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines
37  * @drive_data: Set if we're driving the data line.
38  * @reg_data_in: register field to indicate data input
39  * @reg_data_out: register field to indicate data output
40  * @reg_data_clock: register field to set the data clock
41  * @reg_chip_select: register field to set the chip select
42  *
43  * This structure is used for the communication between the driver
44  * and the eeprom_93cx6 handlers for reading the eeprom.
45  */
46 struct eeprom_93cx6 {
47 	void *data;
48 
49 	void (*register_read)(struct eeprom_93cx6 *eeprom);
50 	void (*register_write)(struct eeprom_93cx6 *eeprom);
51 
52 	int width;
53 
54 	char drive_data;
55 	char reg_data_in;
56 	char reg_data_out;
57 	char reg_data_clock;
58 	char reg_chip_select;
59 };
60 
61 extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom,
62 	const u8 word, u16 *data);
63 extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
64 	const u8 word, __le16 *data, const u16 words);
65 extern void eeprom_93cx6_readb(struct eeprom_93cx6 *eeprom,
66 	const u8 byte, u8 *data);
67 extern void eeprom_93cx6_multireadb(struct eeprom_93cx6 *eeprom,
68 	const u8 byte, u8 *data, const u16 bytes);
69 
70 extern void eeprom_93cx6_wren(struct eeprom_93cx6 *eeprom, bool enable);
71 
72 extern void eeprom_93cx6_write(struct eeprom_93cx6 *eeprom,
73 			       u8 addr, u16 data);
74