1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2005, Intec Automation Inc.
4  * Copyright (C) 2014, Freescale Semiconductor, Inc.
5  */
6 
7 #ifndef __LINUX_MTD_SFDP_H
8 #define __LINUX_MTD_SFDP_H
9 
10 /* SFDP revisions */
11 #define SFDP_JESD216_MAJOR	1
12 #define SFDP_JESD216_MINOR	0
13 #define SFDP_JESD216A_MINOR	5
14 #define SFDP_JESD216B_MINOR	6
15 
16 /* Basic Flash Parameter Table */
17 
18 /*
19  * JESD216 rev D defines a Basic Flash Parameter Table of 20 DWORDs.
20  * They are indexed from 1 but C arrays are indexed from 0.
21  */
22 #define BFPT_DWORD(i)		((i) - 1)
23 #define BFPT_DWORD_MAX		20
24 
25 struct sfdp_bfpt {
26 	u32	dwords[BFPT_DWORD_MAX];
27 };
28 
29 /* The first version of JESD216 defined only 9 DWORDs. */
30 #define BFPT_DWORD_MAX_JESD216			9
31 #define BFPT_DWORD_MAX_JESD216B			16
32 
33 /* 1st DWORD. */
34 #define BFPT_DWORD1_FAST_READ_1_1_2		BIT(16)
35 #define BFPT_DWORD1_ADDRESS_BYTES_MASK		GENMASK(18, 17)
36 #define BFPT_DWORD1_ADDRESS_BYTES_3_ONLY	(0x0UL << 17)
37 #define BFPT_DWORD1_ADDRESS_BYTES_3_OR_4	(0x1UL << 17)
38 #define BFPT_DWORD1_ADDRESS_BYTES_4_ONLY	(0x2UL << 17)
39 #define BFPT_DWORD1_DTR				BIT(19)
40 #define BFPT_DWORD1_FAST_READ_1_2_2		BIT(20)
41 #define BFPT_DWORD1_FAST_READ_1_4_4		BIT(21)
42 #define BFPT_DWORD1_FAST_READ_1_1_4		BIT(22)
43 
44 /* 5th DWORD. */
45 #define BFPT_DWORD5_FAST_READ_2_2_2		BIT(0)
46 #define BFPT_DWORD5_FAST_READ_4_4_4		BIT(4)
47 
48 /* 11th DWORD. */
49 #define BFPT_DWORD11_PAGE_SIZE_SHIFT		4
50 #define BFPT_DWORD11_PAGE_SIZE_MASK		GENMASK(7, 4)
51 
52 /* 15th DWORD. */
53 
54 /*
55  * (from JESD216 rev B)
56  * Quad Enable Requirements (QER):
57  * - 000b: Device does not have a QE bit. Device detects 1-1-4 and 1-4-4
58  *         reads based on instruction. DQ3/HOLD# functions are hold during
59  *         instruction phase.
60  * - 001b: QE is bit 1 of status register 2. It is set via Write Status with
61  *         two data bytes where bit 1 of the second byte is one.
62  *         [...]
63  *         Writing only one byte to the status register has the side-effect of
64  *         clearing status register 2, including the QE bit. The 100b code is
65  *         used if writing one byte to the status register does not modify
66  *         status register 2.
67  * - 010b: QE is bit 6 of status register 1. It is set via Write Status with
68  *         one data byte where bit 6 is one.
69  *         [...]
70  * - 011b: QE is bit 7 of status register 2. It is set via Write status
71  *         register 2 instruction 3Eh with one data byte where bit 7 is one.
72  *         [...]
73  *         The status register 2 is read using instruction 3Fh.
74  * - 100b: QE is bit 1 of status register 2. It is set via Write Status with
75  *         two data bytes where bit 1 of the second byte is one.
76  *         [...]
77  *         In contrast to the 001b code, writing one byte to the status
78  *         register does not modify status register 2.
79  * - 101b: QE is bit 1 of status register 2. Status register 1 is read using
80  *         Read Status instruction 05h. Status register2 is read using
81  *         instruction 35h. QE is set via Write Status instruction 01h with
82  *         two data bytes where bit 1 of the second byte is one.
83  *         [...]
84  */
85 #define BFPT_DWORD15_QER_MASK			GENMASK(22, 20)
86 #define BFPT_DWORD15_QER_NONE			(0x0UL << 20) /* Micron */
87 #define BFPT_DWORD15_QER_SR2_BIT1_BUGGY		(0x1UL << 20)
88 #define BFPT_DWORD15_QER_SR1_BIT6		(0x2UL << 20) /* Macronix */
89 #define BFPT_DWORD15_QER_SR2_BIT7		(0x3UL << 20)
90 #define BFPT_DWORD15_QER_SR2_BIT1_NO_RD		(0x4UL << 20)
91 #define BFPT_DWORD15_QER_SR2_BIT1		(0x5UL << 20) /* Spansion */
92 
93 #define BFPT_DWORD16_SWRST_EN_RST		BIT(12)
94 
95 #define BFPT_DWORD18_CMD_EXT_MASK		GENMASK(30, 29)
96 #define BFPT_DWORD18_CMD_EXT_REP		(0x0UL << 29) /* Repeat */
97 #define BFPT_DWORD18_CMD_EXT_INV		(0x1UL << 29) /* Invert */
98 #define BFPT_DWORD18_CMD_EXT_RES		(0x2UL << 29) /* Reserved */
99 #define BFPT_DWORD18_CMD_EXT_16B		(0x3UL << 29) /* 16-bit opcode */
100 
101 struct sfdp_parameter_header {
102 	u8		id_lsb;
103 	u8		minor;
104 	u8		major;
105 	u8		length; /* in double words */
106 	u8		parameter_table_pointer[3]; /* byte address */
107 	u8		id_msb;
108 };
109 
110 int spi_nor_parse_sfdp(struct spi_nor *nor);
111 
112 #endif /* __LINUX_MTD_SFDP_H */
113