include/spi_flash.h

   1 /*
   2  * Interface to SPI flash
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  */
  13 #ifndef _SPI_FLASH_H_
  14 #define _SPI_FLASH_H_
  15
  16 #include <spi.h>
  17 #include <linux/types.h>
  18 #include <linux/compiler.h>
  19
  20 struct spi_flash {
  21         struct spi_slave *spi;
  22
  23         const char      *name;
  24
  25         /* Total flash size */
  26         u32             size;
  27         /* Write (page) size */
  28         u32             page_size;
  29         /* Erase (sector) size */
  30         u32             sector_size;
  31 #ifdef CONFIG_SPI_FLASH_BAR
  32         /* Bank read cmd */
  33         u8              bank_read_cmd;
  34         /* Bank write cmd */
  35         u8              bank_write_cmd;
  36         /* Current flash bank */
  37         u8              bank_curr;
  38 #endif
  39         /* Poll cmd - for flash erase/program */
  40         u8              poll_cmd;
  41
  42         void *memory_map;       /* Address of read-only SPI flash access */
  43         int             (*read)(struct spi_flash *flash, u32 offset,
  44                                 size_t len, void *buf);
  45         int             (*write)(struct spi_flash *flash, u32 offset,
  46                                 size_t len, const void *buf);
  47         int             (*erase)(struct spi_flash *flash, u32 offset,
  48                                 size_t len);
  49 };
  50
  51 /**
  52  * spi_flash_do_alloc - Allocate a new spi flash structure
  53  *
  54  * The structure is allocated and cleared with default values for
  55  * read, write and erase, which the caller can modify. The caller must set
  56  * up size, page_size and sector_size.
  57  *
  58  * Use the helper macro spi_flash_alloc() to call this.
  59  *
  60  * @offset: Offset of struct spi_slave within slave structure
  61  * @size: Size of slave structure
  62  * @spi: SPI slave
  63  * @name: Name of SPI flash device
  64  */
  65 void *spi_flash_do_alloc(int offset, int size, struct spi_slave *spi,
  66                          const char *name);
  67
  68 /**
  69  * spi_flash_alloc - Allocate a new SPI flash structure
  70  *
  71  * @_struct: Name of structure to allocate (e.g. struct ramtron_spi_fram). This
  72  *      structure must contain a member 'struct spi_flash *flash'.
  73  * @spi: SPI slave
  74  * @name: Name of SPI flash device
  75  */
  76 #define spi_flash_alloc(_struct, spi, name) \
  77         spi_flash_do_alloc(offsetof(_struct, flash), sizeof(_struct), \
  78                                 spi, name)
  79
  80 /**
  81  * spi_flash_alloc_base - Allocate a new SPI flash structure with no private data
  82  *
  83  * @spi: SPI slave
  84  * @name: Name of SPI flash device
  85  */
  86 #define spi_flash_alloc_base(spi, name) \
  87         spi_flash_do_alloc(0, sizeof(struct spi_flash), spi, name)
  88
  89 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
  90                 unsigned int max_hz, unsigned int spi_mode);
  91 void spi_flash_free(struct spi_flash *flash);
  92
  93 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
  94                 size_t len, void *buf)
  95 {
  96         return flash->read(flash, offset, len, buf);
  97 }
  98
  99 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
 100                 size_t len, const void *buf)
 101 {
 102         return flash->write(flash, offset, len, buf);
 103 }
 104
 105 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
 106                 size_t len)
 107 {
 108         return flash->erase(flash, offset, len);
 109 }
 110
 111 void spi_boot(void) __noreturn;
 112
 113 #endif /* _SPI_FLASH_H_ */