c9bfcb3151
The current driver may cause glitches on SPI CLK line since one must disable the SPI controller before changing any HW settings. Fix this by implementing a local spi_transfer function that won't change speed and/or word size while CS is active. While doing that heavy lifting a few other issues were addressed too: - Make word size 16 and 32 work too. - Honor bits_per_word and speed_hz in spi transaction. - Optimize the common path. This also stops using the "bitbang" framework (except for a few constants). [Roel Kluin <12o3l@tiscali.nl>: "irq" needs to be signed] Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
248 lines
8.0 KiB
Plaintext
248 lines
8.0 KiB
Plaintext
#
|
|
# SPI driver configuration
|
|
#
|
|
# NOTE: the reason this doesn't show SPI slave support is mostly that
|
|
# nobody's needed a slave side API yet. The master-role API is not
|
|
# fully appropriate there, so it'd need some thought to do well.
|
|
#
|
|
menuconfig SPI
|
|
bool "SPI support"
|
|
depends on HAS_IOMEM
|
|
help
|
|
The "Serial Peripheral Interface" is a low level synchronous
|
|
protocol. Chips that support SPI can have data transfer rates
|
|
up to several tens of Mbit/sec. Chips are addressed with a
|
|
controller and a chipselect. Most SPI slaves don't support
|
|
dynamic device discovery; some are even write-only or read-only.
|
|
|
|
SPI is widely used by microcontrollers to talk with sensors,
|
|
eeprom and flash memory, codecs and various other controller
|
|
chips, analog to digital (and d-to-a) converters, and more.
|
|
MMC and SD cards can be accessed using SPI protocol; and for
|
|
DataFlash cards used in MMC sockets, SPI must always be used.
|
|
|
|
SPI is one of a family of similar protocols using a four wire
|
|
interface (select, clock, data in, data out) including Microwire
|
|
(half duplex), SSP, SSI, and PSP. This driver framework should
|
|
work with most such devices and controllers.
|
|
|
|
if SPI
|
|
|
|
config SPI_DEBUG
|
|
boolean "Debug support for SPI drivers"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Say "yes" to enable debug messaging (like dev_dbg and pr_debug),
|
|
sysfs, and debugfs support in SPI controller and protocol drivers.
|
|
|
|
#
|
|
# MASTER side ... talking to discrete SPI slave chips including microcontrollers
|
|
#
|
|
|
|
config SPI_MASTER
|
|
# boolean "SPI Master Support"
|
|
boolean
|
|
default SPI
|
|
help
|
|
If your system has an master-capable SPI controller (which
|
|
provides the clock and chipselect), you can enable that
|
|
controller and the protocol drivers for the SPI slave chips
|
|
that are connected.
|
|
|
|
comment "SPI Master Controller Drivers"
|
|
depends on SPI_MASTER
|
|
|
|
config SPI_ATMEL
|
|
tristate "Atmel SPI Controller"
|
|
depends on (ARCH_AT91 || AVR32) && SPI_MASTER
|
|
help
|
|
This selects a driver for the Atmel SPI Controller, present on
|
|
many AT32 (AVR32) and AT91 (ARM) chips.
|
|
|
|
config SPI_BFIN
|
|
tristate "SPI controller driver for ADI Blackfin5xx"
|
|
depends on SPI_MASTER && BLACKFIN
|
|
help
|
|
This is the SPI controller master driver for Blackfin 5xx processor.
|
|
|
|
config SPI_AU1550
|
|
tristate "Au1550/Au12x0 SPI Controller"
|
|
depends on SPI_MASTER && (SOC_AU1550 || SOC_AU1200) && EXPERIMENTAL
|
|
select SPI_BITBANG
|
|
help
|
|
If you say yes to this option, support will be included for the
|
|
Au1550 SPI controller (may also work with Au1200,Au1210,Au1250).
|
|
|
|
This driver can also be built as a module. If so, the module
|
|
will be called au1550_spi.
|
|
|
|
config SPI_BITBANG
|
|
tristate "Bitbanging SPI master"
|
|
depends on SPI_MASTER && EXPERIMENTAL
|
|
help
|
|
With a few GPIO pins, your system can bitbang the SPI protocol.
|
|
Select this to get SPI support through I/O pins (GPIO, parallel
|
|
port, etc). Or, some systems' SPI master controller drivers use
|
|
this code to manage the per-word or per-transfer accesses to the
|
|
hardware shift registers.
|
|
|
|
This is library code, and is automatically selected by drivers that
|
|
need it. You only need to select this explicitly to support driver
|
|
modules that aren't part of this kernel tree.
|
|
|
|
config SPI_BUTTERFLY
|
|
tristate "Parallel port adapter for AVR Butterfly (DEVELOPMENT)"
|
|
depends on SPI_MASTER && PARPORT && EXPERIMENTAL
|
|
select SPI_BITBANG
|
|
help
|
|
This uses a custom parallel port cable to connect to an AVR
|
|
Butterfly <http://www.atmel.com/products/avr/butterfly>, an
|
|
inexpensive battery powered microcontroller evaluation board.
|
|
This same cable can be used to flash new firmware.
|
|
|
|
config SPI_IMX
|
|
tristate "Freescale iMX SPI controller"
|
|
depends on SPI_MASTER && ARCH_IMX && EXPERIMENTAL
|
|
help
|
|
This enables using the Freescale iMX SPI controller in master
|
|
mode.
|
|
|
|
config SPI_LM70_LLP
|
|
tristate "Parallel port adapter for LM70 eval board (DEVELOPMENT)"
|
|
depends on SPI_MASTER && PARPORT && EXPERIMENTAL
|
|
select SPI_BITBANG
|
|
help
|
|
This driver supports the NS LM70 LLP Evaluation Board,
|
|
which interfaces to an LM70 temperature sensor using
|
|
a parallel port.
|
|
|
|
config SPI_MPC52xx_PSC
|
|
tristate "Freescale MPC52xx PSC SPI controller"
|
|
depends on SPI_MASTER && PPC_MPC52xx && EXPERIMENTAL
|
|
help
|
|
This enables using the Freescale MPC52xx Programmable Serial
|
|
Controller in master SPI mode.
|
|
|
|
config SPI_MPC83xx
|
|
tristate "Freescale MPC83xx/QUICC Engine SPI controller"
|
|
depends on SPI_MASTER && (PPC_83xx || QUICC_ENGINE) && EXPERIMENTAL
|
|
help
|
|
This enables using the Freescale MPC83xx and QUICC Engine SPI
|
|
controllers in master mode.
|
|
|
|
Note, this driver uniquely supports the SPI controller on the MPC83xx
|
|
family of PowerPC processors, plus processors with QUICC Engine
|
|
technology. This driver uses a simple set of shift registers for data
|
|
(opposed to the CPM based descriptor model).
|
|
|
|
config SPI_OMAP_UWIRE
|
|
tristate "OMAP1 MicroWire"
|
|
depends on SPI_MASTER && ARCH_OMAP1
|
|
select SPI_BITBANG
|
|
help
|
|
This hooks up to the MicroWire controller on OMAP1 chips.
|
|
|
|
config SPI_OMAP24XX
|
|
tristate "McSPI driver for OMAP24xx/OMAP34xx"
|
|
depends on SPI_MASTER && (ARCH_OMAP24XX || ARCH_OMAP34XX)
|
|
help
|
|
SPI master controller for OMAP24xx/OMAP34xx Multichannel SPI
|
|
(McSPI) modules.
|
|
|
|
config SPI_PXA2XX
|
|
tristate "PXA2xx SSP SPI master"
|
|
depends on SPI_MASTER && ARCH_PXA && EXPERIMENTAL
|
|
select PXA_SSP
|
|
help
|
|
This enables using a PXA2xx SSP port as a SPI master controller.
|
|
The driver can be configured to use any SSP port and additional
|
|
documentation can be found a Documentation/spi/pxa2xx.
|
|
|
|
config SPI_S3C24XX
|
|
tristate "Samsung S3C24XX series SPI"
|
|
depends on SPI_MASTER && ARCH_S3C2410 && EXPERIMENTAL
|
|
select SPI_BITBANG
|
|
help
|
|
SPI driver for Samsung S3C24XX series ARM SoCs
|
|
|
|
config SPI_S3C24XX_GPIO
|
|
tristate "Samsung S3C24XX series SPI by GPIO"
|
|
depends on SPI_MASTER && ARCH_S3C2410 && EXPERIMENTAL
|
|
select SPI_BITBANG
|
|
help
|
|
SPI driver for Samsung S3C24XX series ARM SoCs using
|
|
GPIO lines to provide the SPI bus. This can be used where
|
|
the inbuilt hardware cannot provide the transfer mode, or
|
|
where the board is using non hardware connected pins.
|
|
|
|
config SPI_SH_SCI
|
|
tristate "SuperH SCI SPI controller"
|
|
depends on SPI_MASTER && SUPERH
|
|
select SPI_BITBANG
|
|
help
|
|
SPI driver for SuperH SCI blocks.
|
|
|
|
config SPI_TXX9
|
|
tristate "Toshiba TXx9 SPI controller"
|
|
depends on SPI_MASTER && GENERIC_GPIO && CPU_TX49XX
|
|
help
|
|
SPI driver for Toshiba TXx9 MIPS SoCs
|
|
|
|
config SPI_XILINX
|
|
tristate "Xilinx SPI controller"
|
|
depends on SPI_MASTER && XILINX_VIRTEX && EXPERIMENTAL
|
|
select SPI_BITBANG
|
|
help
|
|
This exposes the SPI controller IP from the Xilinx EDK.
|
|
|
|
See the "OPB Serial Peripheral Interface (SPI) (v1.00e)"
|
|
Product Specification document (DS464) for hardware details.
|
|
|
|
#
|
|
# Add new SPI master controllers in alphabetical order above this line
|
|
#
|
|
|
|
#
|
|
# There are lots of SPI device types, with sensors and memory
|
|
# being probably the most widely used ones.
|
|
#
|
|
comment "SPI Protocol Masters"
|
|
depends on SPI_MASTER
|
|
|
|
config SPI_AT25
|
|
tristate "SPI EEPROMs from most vendors"
|
|
depends on SPI_MASTER && SYSFS
|
|
help
|
|
Enable this driver to get read/write support to most SPI EEPROMs,
|
|
after you configure the board init code to know about each eeprom
|
|
on your target board.
|
|
|
|
This driver can also be built as a module. If so, the module
|
|
will be called at25.
|
|
|
|
config SPI_SPIDEV
|
|
tristate "User mode SPI device driver support"
|
|
depends on SPI_MASTER && EXPERIMENTAL
|
|
help
|
|
This supports user mode SPI protocol drivers.
|
|
|
|
Note that this application programming interface is EXPERIMENTAL
|
|
and hence SUBJECT TO CHANGE WITHOUT NOTICE while it stabilizes.
|
|
|
|
config SPI_TLE62X0
|
|
tristate "Infineon TLE62X0 (for power switching)"
|
|
depends on SPI_MASTER && SYSFS
|
|
help
|
|
SPI driver for Infineon TLE62X0 series line driver chips,
|
|
such as the TLE6220, TLE6230 and TLE6240. This provides a
|
|
sysfs interface, with each line presented as a kind of GPIO
|
|
exposing both switch control and diagnostic feedback.
|
|
|
|
#
|
|
# Add new SPI protocol masters in alphabetical order above this line
|
|
#
|
|
|
|
# (slave support would go here)
|
|
|
|
endif # SPI
|