2 * Interface to SPI flash
4 * Copyright (C) 2008 Atmel Corporation
6 * See file CREDITS for list of people who contributed to this
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.
17 #include <linux/types.h>
18 #include <linux/compiler.h>
21 #define SECT_4K (1 << 1)
22 #define SECT_32K (1 << 2)
24 /* SST specific macros */
25 #ifdef CONFIG_SPI_FLASH_SST
26 # define SST_WP 0x01 /* Supports AAI word program */
27 # define CMD_SST_BP 0x02 /* Byte Program */
28 # define CMD_SST_AAI_WP 0xAD /* Auto Address Incr Word Program */
32 struct spi_slave *spi;
36 /* Total flash size */
38 /* Write (page) size */
44 #ifdef CONFIG_SPI_FLASH_BAR
49 /* Current flash bank */
52 /* Poll cmd - for flash erase/program */
54 /* Erase cmd 4K, 32K, 64K */
57 void *memory_map; /* Address of read-only SPI flash access */
58 int (*read)(struct spi_flash *flash, u32 offset,
59 size_t len, void *buf);
60 int (*write)(struct spi_flash *flash, u32 offset,
61 size_t len, const void *buf);
62 int (*erase)(struct spi_flash *flash, u32 offset,
67 * spi_flash_do_alloc - Allocate a new spi flash structure
69 * The structure is allocated and cleared with default values for
70 * read, write and erase, which the caller can modify. The caller must set
71 * up size, page_size and sector_size.
73 * Use the helper macro spi_flash_alloc() to call this.
75 * @offset: Offset of struct spi_slave within slave structure
76 * @size: Size of slave structure
78 * @name: Name of SPI flash device
80 void *spi_flash_do_alloc(int offset, int size, struct spi_slave *spi,
84 * spi_flash_alloc - Allocate a new SPI flash structure
86 * @_struct: Name of structure to allocate (e.g. struct ramtron_spi_fram). This
87 * structure must contain a member 'struct spi_flash *flash'.
89 * @name: Name of SPI flash device
91 #define spi_flash_alloc(_struct, spi, name) \
92 spi_flash_do_alloc(offsetof(_struct, flash), sizeof(_struct), \
96 * spi_flash_alloc_base - Allocate a new SPI flash structure with no private data
99 * @name: Name of SPI flash device
101 #define spi_flash_alloc_base(spi, name) \
102 spi_flash_do_alloc(0, sizeof(struct spi_flash), spi, name)
104 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
105 unsigned int max_hz, unsigned int spi_mode);
106 void spi_flash_free(struct spi_flash *flash);
108 static inline int spi_flash_read(struct spi_flash *flash, u32 offset,
109 size_t len, void *buf)
111 return flash->read(flash, offset, len, buf);
114 static inline int spi_flash_write(struct spi_flash *flash, u32 offset,
115 size_t len, const void *buf)
117 return flash->write(flash, offset, len, buf);
120 static inline int spi_flash_erase(struct spi_flash *flash, u32 offset,
123 return flash->erase(flash, offset, len);
126 void spi_boot(void) __noreturn;
128 #endif /* _SPI_FLASH_H_ */