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sf: Add dual memories support - DUAL_STACKED

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This patch added support for accessing dual memories in
stacked connection with single chipselect line from controller.

For more info - see doc/SPI/README.dual-flash

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
This commit is contained in:
Jagannadha Sutradharudu Teki 2014-01-12 21:40:11 +05:30
parent ab92224f45
commit f77f469117
6 changed files with 138 additions and 11 deletions
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8
include/spi_flash.h
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@ -36,6 +36,12 @@ enum spi_read_cmds {
#define RD_EXTN ARRAY_SLOW | DUAL_OUTPUT_FAST | DUAL_IO_FAST
#define RD_FULL RD_EXTN | QUAD_OUTPUT_FAST | QUAD_IO_FAST
/* Dual SPI flash memories */
enum spi_dual_flash {
SF_SINGLE_FLASH = 0,
SF_DUAL_STACKED_FLASH = 1 << 0,
};
/**
* struct spi_flash_params - SPI/QSPI flash device params structure
*
@ -64,6 +70,7 @@ extern const struct spi_flash_params spi_flash_params_table[];
*
* @spi: SPI slave
* @name: Name of SPI flash
* @dual_flash: Indicates dual flash memories - dual stacked
* @size: Total flash size
* @page_size: Write (page) size
* @sector_size: Sector size
@ -88,6 +95,7 @@ extern const struct spi_flash_params spi_flash_params_table[];
struct spi_flash {
struct spi_slave *spi;
const char *name;
u8 dual_flash;
u32 size;
u32 page_size;