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 /**
  23  * struct spi_flash - SPI flash structure
  24  *
  25  * @spi:                SPI slave
  26  * @name:               Name of SPI flash
  27  * @size:               Total flash size
  28  * @page_size:          Write (page) size
  29  * @sector_size:        Sector size
  30  * @erase_size:         Erase size
  31  * @bank_read_cmd:      Bank read cmd
  32  * @bank_write_cmd:     Bank write cmd
  33  * @bank_curr:          Current flash bank
  34  * @poll_cmd:           Poll cmd - for flash erase/program
  35  * @erase_cmd:          Erase cmd 4K, 32K, 64K
  36  * @memory_map:         Address of read-only SPI flash access
  37  * @read:               Flash read ops: Read len bytes at offset into buf
  38  *                      Supported cmds: Fast Array Read
  39  * @write:              Flash write ops: Write len bytes from buf into offeset
  40  *                      Supported cmds: Page Program
  41  * @erase:              Flash erase ops: Erase len bytes from offset
  42  *                      Supported cmds: Sector erase 4K, 32K, 64K
  43  * return 0 - Sucess, 1 - Failure
  44  */
  45 struct spi_flash {
  46         struct spi_slave *spi;
  47         const char *name;
  48
  49         u32 size;
  50         u32 page_size;
  51         u32 sector_size;
  52         u32 erase_size;
  53 #ifdef CONFIG_SPI_FLASH_BAR
  54         u8 bank_read_cmd;
  55         u8 bank_write_cmd;
  56         u8 bank_curr;
  57 #endif
  58         u8 poll_cmd;
  59         u8 erase_cmd;
  60
  61         void *memory_map;
  62         int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);
  63         int (*write)(struct spi_flash *flash, u32 offset, size_t len,
  64                         const void *buf);
  65         int (*erase)(struct spi_flash *flash, u32 offset, size_t len);
  66 };
  67
  68 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
  69                 unsigned int max_hz, unsigned int spi_mode);
  70 void spi_flash_free(struct spi_flash *flash);
  71
  72 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
  73                 size_t len, void *buf)
  74 {
  75         return flash->read(flash, offset, len, buf);
  76 }
  77
  78 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
  79                 size_t len, const void *buf)
  80 {
  81         return flash->write(flash, offset, len, buf);
  82 }
  83
  84 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
  85                 size_t len)
  86 {
  87         return flash->erase(flash, offset, len);
  88 }
  89
  90 void spi_boot(void) __noreturn;
  91
  92 #endif /* _SPI_FLASH_H_ */