MLK-10467 mtd:spi Add ATMEL AT45DB021E support

This patch is to add atmel AT45DB021E spi flash support.

Since this flash is different from the spi flash that we previous use such
as m25p32 and spanion spi nor flashes, pieces of code are added.

1.
The default page size is 264 bytes, but the mtd/spi framework can not
handle such page. So we need to configure the page size from 264 to 256 bytes.

	Page Size				 command seq
“Power of 2” binary page size (256 bytes)|      3Dh 2Ah 80h A6h
DataFlash page size (264 bytes)          |      3Dh 2Ah 80h A7h
And when probe the flash, configure the flash to 256 bytes page size, if
the page size is already 256bytes, just return and do not configure it again.
The page size configuration times is only about 10000, so to avoid configuring
it each time.

2.
Add the flash params in sf_params.c.

3.
This flash support 2K block erase, add this flag.

4.
The status command is 0xD7, different from others. It's polling status
bit is Bit 7
-> 0 Device is busy with an internal operation.
-> 1 Device is ready.

This patch has been tested on mx7d 19x19 ddr3 arm2 board. And tested
on mx7d 12x12 lpddr3 board. All works fine.

Note:
Since this flash is only 256KB, we can not test spi boot on mx7d 19x19 arm2
board. If want to test this flash, open CONFIG_SYS_USE_SPINOR.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/spi_flash.h b/include/spi_flash.h
index 1a11286..f3efb2b 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -20,6 +20,7 @@
 #include <linux/compiler.h>
 
 /* sf param flags */
+#define SECT_2K		(1 << 0)
 #define SECT_4K		1 << 1
 #define SECT_32K	1 << 2
 #define E_FSR		1 << 3