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d25ce7d24c
This adds a new SPI flash subsystem. Currently, only AT45 DataFlash in non-power-of-two mode is supported, but some preliminary support for other flash types is in place as well. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/*
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* SPI flash internal definitions
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*
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* Copyright (C) 2008 Atmel Corporation
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*/
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/* Common parameters */
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#define SPI_FLASH_PROG_TIMEOUT ((10 * CFG_HZ) / 1000)
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#define SPI_FLASH_PAGE_ERASE_TIMEOUT ((50 * CFG_HZ) / 1000)
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#define SPI_FLASH_SECTOR_ERASE_TIMEOUT (10 * CFG_HZ)
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/* Common commands */
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#define CMD_READ_ID 0x9f
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#define CMD_READ_ARRAY_SLOW 0x03
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#define CMD_READ_ARRAY_FAST 0x0b
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#define CMD_READ_ARRAY_LEGACY 0xe8
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/* Send a single-byte command to the device and read the response */
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int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len);
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/*
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* Send a multi-byte command to the device and read the response. Used
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* for flash array reads, etc.
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*/
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int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
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size_t cmd_len, void *data, size_t data_len);
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/*
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* Send a multi-byte command to the device followed by (optional)
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* data. Used for programming the flash array, etc.
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*/
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int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
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const void *data, size_t data_len);
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/*
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* Same as spi_flash_cmd_read() except it also claims/releases the SPI
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* bus. Used as common part of the ->read() operation.
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*/
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int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
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size_t cmd_len, void *data, size_t data_len);
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/* Manufacturer-specific probe functions */
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struct spi_flash *spi_flash_probe_spansion(struct spi_slave *spi, u8 *idcode);
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struct spi_flash *spi_flash_probe_atmel(struct spi_slave *spi, u8 *idcode);
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