forked from Minki/linux
138f5dc61b
Before this patch, m25p80_read() supported few SPI protocols:
- regular SPI 1-1-1
- SPI Dual Output 1-1-2
- SPI Quad Output 1-1-4
On the other hand, m25p80_write() only supported SPI 1-1-1.
This patch updates both m25p80_read() and m25p80_write() functions to let
them support SPI 1-2-2 and SPI 1-4-4 protocols for Fast Read and Page
Program SPI commands.
It adopts a conservative approach to avoid regressions. Hence the new
implementations try to be as close as possible to the old implementations,
so the main differences are:
- the tx_nbits values now being set properly for the spi_transfer
structures carrying the (op code + address/dummy) bytes
- and the spi_transfer structure being split into 2 spi_transfer
structures when the numbers of I/O lines are different for op code and
for address/dummy byte transfers on the SPI bus.
Besides, the current spi-nor framework supports neither the SPI 2-2-2 nor
the SPI 4-4-4 protocols. So, for now, we don't need to update the
m25p80_{read|write}_reg() functions as SPI 1-1-1 is the only one possible
protocol.
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
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| .. | ||
| bcm47xxsflash.c | ||
| bcm47xxsflash.h | ||
| block2mtd.c | ||
| docg3.c | ||
| docg3.h | ||
| Kconfig | ||
| lart.c | ||
| m25p80.c | ||
| Makefile | ||
| ms02-nv.c | ||
| ms02-nv.h | ||
| mtd_dataflash.c | ||
| mtdram.c | ||
| phram.c | ||
| pmc551.c | ||
| powernv_flash.c | ||
| serial_flash_cmds.h | ||
| slram.c | ||
| spear_smi.c | ||
| sst25l.c | ||
| st_spi_fsm.c | ||