mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 04:03:58 +08:00
8051effcbc
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> |
||
|---|---|---|
| .. | ||
| ad7877.h | ||
| ad7879.h | ||
| ads7846.h | ||
| at73c213.h | ||
| corgi_lcd.h | ||
| ds1305.h | ||
| eeprom.h | ||
| flash.h | ||
| Kbuild | ||
| libertas_spi.h | ||
| lms283gf05.h | ||
| max7301.h | ||
| mc33880.h | ||
| mcp23s08.h | ||
| mmc_spi.h | ||
| orion_spi.h | ||
| sh_msiof.h | ||
| spi_bitbang.h | ||
| spi_gpio.h | ||
| spi.h | ||
| spidev.h | ||
| tdo24m.h | ||
| tle62x0.h | ||
| wl12xx.h | ||
| xilinx_spi.h | ||