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kernel_optimize_test/drivers/spi/Kconfig
Jan Nikitenko 63bd23591e au1550 SPI controller driver 
Here is a driver for the Alchemy au1550 PSC (Programmable Serial
Controller) in SPI master mode.

It supports dma transfers using the Alchemy descriptor based dma controller
for 4-8 bits per word SPI transfers.  For 9-24 bits per word transfers, pio
irq based mode is used to avoid setup of dma channels from scratch on each
number of bits per word change.

Tested with au1550; this may also work on other MIPS Alchemy cpus, like
au1200/au1210/au1250.  Used extensively with SD card connected via SPI;
this handles 8.1MHz SPI clock transfers using dma without any problem (the
highest SPI clock freq possible with au1550 running on 324MHz).

The driver supports sharing of SPI bus by multiple devices.  All features
of Alchemy SPI mode are supported (all SPI modes, msb/lsb first, bits per
word in 4-24 range).

As the SPI clock of the controller depends on main input clock that shall
be configured externally, platform data structure for au1550 SPI controller
driver contains mainclk_hz attribute to define the input clock rate.  From
this value, dividers of the controller for SPI clock are set up for
required frequency.

Signed-off-by: Jan Nikitenko <jan.nikitenko@gmail.com>

Whitespace and section fixups.  Remove partial workaround for platform
setup bug in dma_mask setup; it couldn't work with multiple controllers.

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>
2007-05-08 11:15:16 -07:00

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#
# 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.
#
menu "SPI support"
config SPI
bool "SPI support"
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.
config SPI_DEBUG
boolean "Debug support for SPI drivers"
depends on SPI && 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 && BFIN
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_MPC83xx
tristate "Freescale MPC83xx SPI controller"
depends on SPI_MASTER && PPC_83xx && EXPERIMENTAL
select SPI_BITBANG
help
This enables using the Freescale MPC83xx SPI controller in master
mode.
Note, this driver uniquely supports the SPI controller on the MPC83xx
family of PowerPC processors. The MPC83xx 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_PXA2XX
tristate "PXA2xx SSP SPI master"
depends on SPI_MASTER && ARCH_PXA && EXPERIMENTAL
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
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 && SPI_BITBANG && EXPERIMENTAL
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.
#
# 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.
#
# Add new SPI protocol masters in alphabetical order above this line
#
# (slave support would go here)
endmenu # "SPI support"
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