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| author | Mingkai Hu <Mingkai.hu@freescale.com> | 2010-10-12 14:18:32 +0400 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2010-10-13 07:38:12 +0400 |
| commit | 8b60d6c25b2a2d3525d5322de856c3ca408e5783 (patch) | |
| tree | 2dd4c2c98f9facd87e052795ea79be0c734ec400 /drivers/spi/Kconfig | |
| parent | b36ece832512c1a0afa54ff0a56d63492a1caf08 (diff) | |
| download | linux-8b60d6c25b2a2d3525d5322de856c3ca408e5783.tar.xz | |
spi/fsl_spi: add eSPI controller support
Add eSPI controller support based on the library code spi_fsl_lib.c.
The eSPI controller is newer controller 85xx/Pxxx devices supported.
There're some differences comparing to the SPI controller:
1. Has different register map and different bit definition
So leave the code operated the register to the driver code, not
the common code.
2. Support 4 dedicated chip selects
The software can't controll the chip selects directly, The SPCOM[CS]
field is used to select which chip selects is used, and the
SPCOM[TRANLEN] field is set to tell the controller how long the CS
signal need to be asserted. So the driver doesn't need the chipselect
related function when transfering data, just set corresponding register
fields to controll the chipseclect.
3. Different Transmit/Receive FIFO access register behavior
For SPI controller, the Tx/Rx FIFO access register can hold only
one character regardless of the character length, but for eSPI
controller, the register can hold 4 or 2 characters according to
the character lengths. Access the Tx/Rx FIFO access register of the
eSPI controller will shift out/in 4/2 characters one time. For SPI
subsystem, the command and data are put into different transfers, so
we need to combine all the transfers to one transfer in order to pass
the transfer to eSPI controller.
4. The max transaction length limitation
The max transaction length one time is limitted by the SPCOM[TRANSLEN]
field which is 0xFFFF. When used mkfs.ext2 command to create ext2
filesystem on the flash, the read length will exceed the max value of
the SPCOM[TRANSLEN] field.
Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/Kconfig')
| -rw-r--r-- | drivers/spi/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 0e6619426ea4..9949c252c23d 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -195,6 +195,15 @@ config SPI_FSL_SPI MPC83xx platform uses the controller in cpu mode or CPM/QE mode. MPC8569 uses the controller in QE mode, MPC8610 in cpu mode. +config SPI_FSL_ESPI + tristate "Freescale eSPI controller" + depends on FSL_SOC + select SPI_FSL_LIB + help + This enables using the Freescale eSPI controllers in master mode. + From MPC8536, 85xx platform uses the controller, and all P10xx, + P20xx, P30xx,P40xx, P50xx uses this controller. + config SPI_OMAP_UWIRE tristate "OMAP1 MicroWire" depends on ARCH_OMAP1 |