include/spi_flash.h

   1 /*
   2  * Common SPI flash Interface
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   5  * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc.
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  */
  14
  15 #ifndef _SPI_FLASH_H_
  16 #define _SPI_FLASH_H_
  17
  18 #include <spi.h>
  19 #include <linux/types.h>
  20 #include <linux/compiler.h>
  21
  22 /* sf param flags */
  23 #define SECT_4K         1 << 1
  24 #define SECT_32K        1 << 2
  25 #define E_FSR           1 << 3
  26 #define WR_QPP          1 << 4
  27
  28 /* Enum list - Full read commands */
  29 enum spi_read_cmds {
  30         ARRAY_SLOW = 1 << 0,
  31         DUAL_OUTPUT_FAST = 1 << 1,
  32         DUAL_IO_FAST = 1 << 2,
  33         QUAD_OUTPUT_FAST = 1 << 3,
  34         QUAD_IO_FAST = 1 << 4,
  35 };
  36 #define RD_EXTN         ARRAY_SLOW | DUAL_OUTPUT_FAST | DUAL_IO_FAST
  37 #define RD_FULL         RD_EXTN | QUAD_OUTPUT_FAST | QUAD_IO_FAST
  38
  39 /* Dual SPI flash memories */
  40 enum spi_dual_flash {
  41         SF_SINGLE_FLASH = 0,
  42         SF_DUAL_STACKED_FLASH = 1 << 0,
  43 };
  44
  45 /**
  46  * struct spi_flash_params - SPI/QSPI flash device params structure
  47  *
  48  * @name:               Device name ([MANUFLETTER][DEVTYPE][DENSITY][EXTRAINFO])
  49  * @jedec:              Device jedec ID (0x[1byte_manuf_id][2byte_dev_id])
  50  * @ext_jedec:          Device ext_jedec ID
  51  * @sector_size:        Sector size of this device
  52  * @nr_sectors:         No.of sectors on this device
  53  * @e_rd_cmd:           Enum list for read commands
  54  * @flags:              Importent param, for flash specific behaviour
  55  */
  56 struct spi_flash_params {
  57         const char *name;
  58         u32 jedec;
  59         u16 ext_jedec;
  60         u32 sector_size;
  61         u32 nr_sectors;
  62         u8 e_rd_cmd;
  63         u16 flags;
  64 };
  65
  66 extern const struct spi_flash_params spi_flash_params_table[];
  67
  68 /**
  69  * struct spi_flash - SPI flash structure
  70  *
  71  * @spi:                SPI slave
  72  * @name:               Name of SPI flash
  73  * @dual_flash:         Indicates dual flash memories - dual stacked
  74  * @size:               Total flash size
  75  * @page_size:          Write (page) size
  76  * @sector_size:        Sector size
  77  * @erase_size:         Erase size
  78  * @bank_read_cmd:      Bank read cmd
  79  * @bank_write_cmd:     Bank write cmd
  80  * @bank_curr:          Current flash bank
  81  * @poll_cmd:           Poll cmd - for flash erase/program
  82  * @erase_cmd:          Erase cmd 4K, 32K, 64K
  83  * @read_cmd:           Read cmd - Array Fast, Extn read and quad read.
  84  * @write_cmd:          Write cmd - page and quad program.
  85  * @dummy_byte:         Dummy cycles for read operation.
  86  * @memory_map:         Address of read-only SPI flash access
  87  * @read:               Flash read ops: Read len bytes at offset into buf
  88  *                      Supported cmds: Fast Array Read
  89  * @write:              Flash write ops: Write len bytes from buf into offeset
  90  *                      Supported cmds: Page Program
  91  * @erase:              Flash erase ops: Erase len bytes from offset
  92  *                      Supported cmds: Sector erase 4K, 32K, 64K
  93  * return 0 - Sucess, 1 - Failure
  94  */
  95 struct spi_flash {
  96         struct spi_slave *spi;
  97         const char *name;
  98         u8 dual_flash;
  99
 100         u32 size;
 101         u32 page_size;
 102         u32 sector_size;
 103         u32 erase_size;
 104 #ifdef CONFIG_SPI_FLASH_BAR
 105         u8 bank_read_cmd;
 106         u8 bank_write_cmd;
 107         u8 bank_curr;
 108 #endif
 109         u8 poll_cmd;
 110         u8 erase_cmd;
 111         u8 read_cmd;
 112         u8 write_cmd;
 113         u8 dummy_byte;
 114
 115         void *memory_map;
 116         int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);
 117         int (*write)(struct spi_flash *flash, u32 offset, size_t len,
 118                         const void *buf);
 119         int (*erase)(struct spi_flash *flash, u32 offset, size_t len);
 120 };
 121
 122 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 123                 unsigned int max_hz, unsigned int spi_mode);
 124
 125 /**
 126  * Set up a new SPI flash from an fdt node
 127  *
 128  * @param blob          Device tree blob
 129  * @param slave_node    Pointer to this SPI slave node in the device tree
 130  * @param spi_node      Cached pointer to the SPI interface this node belongs
 131  *                      to
 132  * @return 0 if ok, -1 on error
 133  */
 134 struct spi_flash *spi_flash_probe_fdt(const void *blob, int slave_node,
 135                                       int spi_node);
 136
 137 void spi_flash_free(struct spi_flash *flash);
 138
 139 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
 140                 size_t len, void *buf)
 141 {
 142         return flash->read(flash, offset, len, buf);
 143 }
 144
 145 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 146                 size_t len, const void *buf)
 147 {
 148         return flash->write(flash, offset, len, buf);
 149 }
 150
 151 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 152                 size_t len)
 153 {
 154         return flash->erase(flash, offset, len);
 155 }
 156
 157 void spi_boot(void) __noreturn;
 158
 159 #endif /* _SPI_FLASH_H_ */