drivers/mtd/spi-nor/sfdp.h

   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                        struct spi_nor_flash_parameter *params);
 112
 113 #endif /* __LINUX_MTD_SFDP_H */