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 #include <linux/bits.h>
15
16 /*
17 * EEPROM operation defines.
18 */
19 #define PCI_EEPROM_WIDTH_93C46 6
20 #define PCI_EEPROM_WIDTH_93C56 8
21 #define PCI_EEPROM_WIDTH_93C66 8
22 #define PCI_EEPROM_WIDTH_93C86 8
23 #define PCI_EEPROM_WIDTH_OPCODE 3
24 #define PCI_EEPROM_WRITE_OPCODE 0x05
25 #define PCI_EEPROM_ERASE_OPCODE 0x07
26 #define PCI_EEPROM_READ_OPCODE 0x06
27 #define PCI_EEPROM_EWDS_OPCODE 0x10
28 #define PCI_EEPROM_EWEN_OPCODE 0x13
29
30 /**
31 * struct eeprom_93cx6 - control structure for setting the commands
32 * for reading the eeprom data.
33 * @data: private pointer for the driver.
34 * @register_read(struct eeprom_93cx6 *eeprom): handler to
35 * read the eeprom register, this function should set all reg_* fields.
36 * @register_write(struct eeprom_93cx6 *eeprom): handler to
37 * write to the eeprom register by using all reg_* fields.
38 * @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines
39 * @quirks: eeprom or controller quirks
40 * @drive_data: Set if we're driving the data line.
41 * @reg_data_in: register field to indicate data input
42 * @reg_data_out: register field to indicate data output
43 * @reg_data_clock: register field to set the data clock
44 * @reg_chip_select: register field to set the chip select
45 *
46 * This structure is used for the communication between the driver
47 * and the eeprom_93cx6 handlers for reading the eeprom.
48 */
49 struct eeprom_93cx6 {
50 void *data;
51
52 void (*register_read)(struct eeprom_93cx6 *eeprom);
53 void (*register_write)(struct eeprom_93cx6 *eeprom);
54
55 int width;
56 unsigned int quirks;
57 /* Some EEPROMs require an extra clock cycle before reading */
58 #define PCI_EEPROM_QUIRK_EXTRA_READ_CYCLE BIT(0)
59
60 char drive_data;
61 char reg_data_in;
62 char reg_data_out;
63 char reg_data_clock;
64 char reg_chip_select;
65 };
66
67 extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom,
68 const u8 word, u16 *data);
69 extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
70 const u8 word, __le16 *data, const u16 words);
71 extern void eeprom_93cx6_readb(struct eeprom_93cx6 *eeprom,
72 const u8 byte, u8 *data);
73 extern void eeprom_93cx6_multireadb(struct eeprom_93cx6 *eeprom,
74 const u8 byte, u8 *data, const u16 bytes);
75
76 extern void eeprom_93cx6_wren(struct eeprom_93cx6 *eeprom, bool enable);
77
78 extern void eeprom_93cx6_write(struct eeprom_93cx6 *eeprom,
79 u8 addr, u16 data);
80
has_quirk_extra_read_cycle(struct eeprom_93cx6 * eeprom)81 static inline bool has_quirk_extra_read_cycle(struct eeprom_93cx6 *eeprom)
82 {
83 return eeprom->quirks & PCI_EEPROM_QUIRK_EXTRA_READ_CYCLE;
84 }
85