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spi: Add Freescale/Motorola Coldfire QSPI driver

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Add support for the QSPI controller found some on Freescale/Motorola
Coldfire MCUs.

Full duplex, active high cs, spi modes 0-3 and word sizes 8-16 bits are
supported.  The hardware drives the MISO, MOSI and SCLK lines, but the chip
selects are managed via GPIO and must be configured by the board code.

The QSPI controller has an 80 byte buffer which allows us to transfer up to 16
words at a time.  For transfers longer than 16 words, we split the buffer in
half so we can update in one half while the controller is operating on the
other half.  Interrupt latencies then ultimately limits our sustained thru-put
to something less than half the maximum speed supported by the part.

Signed-off-by: Steven King <sfking@fdwdc.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Steven King
2010-01-20 13:49:44 -07:00
committed by Grant Likely
parent 631e61b7ca
commit 34b8c66173
3 changed files with 651 additions and 0 deletions
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drivers/spi/Kconfig
+10
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@@ -100,6 +100,16 @@ config SPI_BUTTERFLY
inexpensive battery powered microcontroller evaluation board.
This same cable can be used to flash new firmware.
config SPI_COLDFIRE_QSPI
tristate "Freescale Coldfire QSPI controller"
depends on (M520x || M523x || M5249 || M527x || M528x || M532x)
help
This enables support for the Coldfire QSPI controller in master
mode.
This driver can also be built as a module. If so, the module
will be called coldfire_qspi.
config SPI_DAVINCI
tristate "SPI controller driver for DaVinci/DA8xx SoC's"
depends on SPI_MASTER && ARCH_DAVINCI