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authorMagnus Damm <damm@opensource.se>2009-11-26 11:10:05 +0000
committerGrant Likely <grant.likely@secretlab.ca>2009-12-13 00:48:27 -0700
commit8051effcbced8478119167b93b0e9554cb82d28e (patch)
tree03ce88851ca697c8ed5f1d8eadcb32972342dbac /drivers/spi/Kconfig
parent41df70d9ac2d0d36b23a0ec4866f67e540f366ff (diff)
spi: SuperH MSIOF SPI Master driver V2
This patch is V2 of SPI Master support for the SuperH MSIOF. Full duplex, spi mode 0-3, active high cs, 3-wire and lsb first should all be supported, but the driver has so far only been tested with "mmc_spi". The MSIOF hardware comes with 32-bit FIFOs for receive and transmit, and this driver simply breaks the SPI messages into FIFO-sized chunks. The MSIOF hardware manages the pins for clock, receive and transmit (sck/miso/mosi), but the chip select pin is managed by software and must be configured as a regular GPIO pin by the board code. Performance wise there is still room for improvement, but on a Ecovec board with the built-in sh7724 MSIOF0 this driver gets Mini-sd read speeds of about half a megabyte per second. Future work include better clock setup and merging of 8-bit transfers into 32-bit words to reduce interrupt load and improve throughput. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/Kconfig')
-rw-r--r--drivers/spi/Kconfig7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index c00f9e5b9df8..06e1c0c9d35e 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -223,6 +223,13 @@ config SPI_S3C24XX_GPIO
the inbuilt hardware cannot provide the transfer mode, or
where the board is using non hardware connected pins.
+config SPI_SH_MSIOF
+ tristate "SuperH MSIOF SPI controller"
+ depends on SUPERH && HAVE_CLK
+ select SPI_BITBANG
+ help
+ SPI driver for SuperH MSIOF blocks.
+
config SPI_SH_SCI
tristate "SuperH SCI SPI controller"
depends on SUPERH