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 /* SST specific macros */ 21 #ifdef CONFIG_SPI_FLASH_SST 22 # define SST_WP 0x01 /* Supports AAI word program */ 23 # define CMD_SST_BP 0x02 /* Byte Program */ 24 # define CMD_SST_AAI_WP 0xAD /* Auto Address Incr Word Program */ 25 #endif 26 27 struct spi_flash { 28 struct spi_slave *spi; 29 30 const char *name; 31 32 /* Total flash size */ 33 u32 size; 34 /* Write (page) size */ 35 u32 page_size; 36 /* Erase (sector) size */ 37 u32 sector_size; 38 #ifdef CONFIG_SPI_FLASH_BAR 39 /* Bank read cmd */ 40 u8 bank_read_cmd; 41 /* Bank write cmd */ 42 u8 bank_write_cmd; 43 /* Current flash bank */ 44 u8 bank_curr; 45 #endif 46 /* Poll cmd - for flash erase/program */ 47 u8 poll_cmd; 48 49 void *memory_map; /* Address of read-only SPI flash access */ 50 int (*read)(struct spi_flash *flash, u32 offset, 51 size_t len, void *buf); 52 int (*write)(struct spi_flash *flash, u32 offset, 53 size_t len, const void *buf); 54 int (*erase)(struct spi_flash *flash, u32 offset, 55 size_t len); 56 }; 57 58 /** 59 * spi_flash_do_alloc - Allocate a new spi flash structure 60 * 61 * The structure is allocated and cleared with default values for 62 * read, write and erase, which the caller can modify. The caller must set 63 * up size, page_size and sector_size. 64 * 65 * Use the helper macro spi_flash_alloc() to call this. 66 * 67 * @offset: Offset of struct spi_slave within slave structure 68 * @size: Size of slave structure 69 * @spi: SPI slave 70 * @name: Name of SPI flash device 71 */ 72 void *spi_flash_do_alloc(int offset, int size, struct spi_slave *spi, 73 const char *name); 74 75 /** 76 * spi_flash_alloc - Allocate a new SPI flash structure 77 * 78 * @_struct: Name of structure to allocate (e.g. struct ramtron_spi_fram). This 79 * structure must contain a member 'struct spi_flash *flash'. 80 * @spi: SPI slave 81 * @name: Name of SPI flash device 82 */ 83 #define spi_flash_alloc(_struct, spi, name) \ 84 spi_flash_do_alloc(offsetof(_struct, flash), sizeof(_struct), \ 85 spi, name) 86 87 /** 88 * spi_flash_alloc_base - Allocate a new SPI flash structure with no private data 89 * 90 * @spi: SPI slave 91 * @name: Name of SPI flash device 92 */ 93 #define spi_flash_alloc_base(spi, name) \ 94 spi_flash_do_alloc(0, sizeof(struct spi_flash), spi, name) 95 96 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, 97 unsigned int max_hz, unsigned int spi_mode); 98 void spi_flash_free(struct spi_flash *flash); 99 100 static inline int spi_flash_read(struct spi_flash *flash, u32 offset, 101 size_t len, void *buf) 102 { 103 return flash->read(flash, offset, len, buf); 104 } 105 106 static inline int spi_flash_write(struct spi_flash *flash, u32 offset, 107 size_t len, const void *buf) 108 { 109 return flash->write(flash, offset, len, buf); 110 } 111 112 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset, 113 size_t len) 114 { 115 return flash->erase(flash, offset, len); 116 } 117 118 void spi_boot(void) __noreturn; 119 120 #endif /* _SPI_FLASH_H_ */ 121