d29389de0b
Generalize the old at91rm9200 "bootstrap" bitbanging SPI master driver as "spi_gpio", so it works with arbitrary GPIOs and can be configured through platform_data. Such SPI masters support: - any number of bus instances (bus_num is the platform_device.id) - any number of chipselects (one GPIO per spi_device) - all four SPI_MODE values, and SPI_CS_HIGH - i/o word sizes from 1 to 32 bits; - devices configured as with any other spi_master controller When configured using platform_data, this provides relatively low clock rates. On platforms that support inlined GPIO calls, significantly improved transfer speeds are also possible with a semi-custom driver. (It's still painful when accessing flash memory, but less so.) Sanity checked by using this version to replace both native controllers on a board with six different SPI slaves, relying on three different SPI_MODE_* values and both SPI_CS_HIGH settings for correct operation. [akpm@linux-foundation.org: cleanups] Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Magnus Damm <damm@igel.co.jp> Tested-by: Magnus Damm <damm@igel.co.jp> Cc: Torgil Svensson <torgil.svensson@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
271 lines
8.5 KiB
Plaintext
271 lines
8.5 KiB
Plaintext
#
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# SPI driver configuration
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#
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# NOTE: the reason this doesn't show SPI slave support is mostly that
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# nobody's needed a slave side API yet. The master-role API is not
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# fully appropriate there, so it'd need some thought to do well.
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#
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menuconfig SPI
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bool "SPI support"
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depends on HAS_IOMEM
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help
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The "Serial Peripheral Interface" is a low level synchronous
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protocol. Chips that support SPI can have data transfer rates
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up to several tens of Mbit/sec. Chips are addressed with a
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controller and a chipselect. Most SPI slaves don't support
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dynamic device discovery; some are even write-only or read-only.
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SPI is widely used by microcontrollers to talk with sensors,
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eeprom and flash memory, codecs and various other controller
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chips, analog to digital (and d-to-a) converters, and more.
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MMC and SD cards can be accessed using SPI protocol; and for
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DataFlash cards used in MMC sockets, SPI must always be used.
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SPI is one of a family of similar protocols using a four wire
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interface (select, clock, data in, data out) including Microwire
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(half duplex), SSP, SSI, and PSP. This driver framework should
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work with most such devices and controllers.
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if SPI
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config SPI_DEBUG
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boolean "Debug support for SPI drivers"
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depends on DEBUG_KERNEL
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help
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Say "yes" to enable debug messaging (like dev_dbg and pr_debug),
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sysfs, and debugfs support in SPI controller and protocol drivers.
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#
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# MASTER side ... talking to discrete SPI slave chips including microcontrollers
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#
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config SPI_MASTER
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# boolean "SPI Master Support"
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boolean
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default SPI
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help
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If your system has an master-capable SPI controller (which
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provides the clock and chipselect), you can enable that
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controller and the protocol drivers for the SPI slave chips
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that are connected.
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if SPI_MASTER
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comment "SPI Master Controller Drivers"
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config SPI_ATMEL
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tristate "Atmel SPI Controller"
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depends on (ARCH_AT91 || AVR32)
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help
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This selects a driver for the Atmel SPI Controller, present on
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many AT32 (AVR32) and AT91 (ARM) chips.
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config SPI_BFIN
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tristate "SPI controller driver for ADI Blackfin5xx"
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depends on BLACKFIN
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help
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This is the SPI controller master driver for Blackfin 5xx processor.
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config SPI_AU1550
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tristate "Au1550/Au12x0 SPI Controller"
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depends on (SOC_AU1550 || SOC_AU1200) && EXPERIMENTAL
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select SPI_BITBANG
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help
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If you say yes to this option, support will be included for the
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Au1550 SPI controller (may also work with Au1200,Au1210,Au1250).
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This driver can also be built as a module. If so, the module
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will be called au1550_spi.
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config SPI_BITBANG
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tristate "Utilities for Bitbanging SPI masters"
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help
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With a few GPIO pins, your system can bitbang the SPI protocol.
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Select this to get SPI support through I/O pins (GPIO, parallel
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port, etc). Or, some systems' SPI master controller drivers use
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this code to manage the per-word or per-transfer accesses to the
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hardware shift registers.
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This is library code, and is automatically selected by drivers that
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need it. You only need to select this explicitly to support driver
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modules that aren't part of this kernel tree.
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config SPI_BUTTERFLY
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tristate "Parallel port adapter for AVR Butterfly (DEVELOPMENT)"
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depends on PARPORT
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select SPI_BITBANG
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help
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This uses a custom parallel port cable to connect to an AVR
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Butterfly <http://www.atmel.com/products/avr/butterfly>, an
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inexpensive battery powered microcontroller evaluation board.
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This same cable can be used to flash new firmware.
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config SPI_GPIO
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tristate "GPIO-based bitbanging SPI Master"
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depends on GENERIC_GPIO
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select SPI_BITBANG
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help
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This simple GPIO bitbanging SPI master uses the arch-neutral GPIO
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interface to manage MOSI, MISO, SCK, and chipselect signals. SPI
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slaves connected to a bus using this driver are configured as usual,
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except that the spi_board_info.controller_data holds the GPIO number
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for the chipselect used by this controller driver.
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Note that this driver often won't achieve even 1 Mbit/sec speeds,
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making it unusually slow for SPI. If your platform can inline
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GPIO operations, you should be able to leverage that for better
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speed with a custom version of this driver; see the source code.
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config SPI_IMX
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tristate "Freescale iMX SPI controller"
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depends on ARCH_IMX && EXPERIMENTAL
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help
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This enables using the Freescale iMX SPI controller in master
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mode.
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config SPI_LM70_LLP
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tristate "Parallel port adapter for LM70 eval board (DEVELOPMENT)"
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depends on PARPORT && EXPERIMENTAL
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select SPI_BITBANG
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help
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This driver supports the NS LM70 LLP Evaluation Board,
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which interfaces to an LM70 temperature sensor using
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a parallel port.
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config SPI_MPC52xx_PSC
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tristate "Freescale MPC52xx PSC SPI controller"
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depends on PPC_MPC52xx && EXPERIMENTAL
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help
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This enables using the Freescale MPC52xx Programmable Serial
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Controller in master SPI mode.
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config SPI_MPC83xx
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tristate "Freescale MPC83xx/QUICC Engine SPI controller"
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depends on (PPC_83xx || QUICC_ENGINE) && EXPERIMENTAL
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help
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This enables using the Freescale MPC83xx and QUICC Engine SPI
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controllers in master mode.
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Note, this driver uniquely supports the SPI controller on the MPC83xx
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family of PowerPC processors, plus processors with QUICC Engine
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technology. This driver uses a simple set of shift registers for data
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(opposed to the CPM based descriptor model).
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config SPI_OMAP_UWIRE
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tristate "OMAP1 MicroWire"
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depends on ARCH_OMAP1
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select SPI_BITBANG
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help
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This hooks up to the MicroWire controller on OMAP1 chips.
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config SPI_OMAP24XX
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tristate "McSPI driver for OMAP24xx/OMAP34xx"
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depends on ARCH_OMAP24XX || ARCH_OMAP34XX
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help
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SPI master controller for OMAP24xx/OMAP34xx Multichannel SPI
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(McSPI) modules.
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config SPI_ORION
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tristate "Orion SPI master (EXPERIMENTAL)"
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depends on PLAT_ORION && EXPERIMENTAL
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help
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This enables using the SPI master controller on the Orion chips.
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config SPI_PXA2XX
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tristate "PXA2xx SSP SPI master"
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depends on ARCH_PXA && EXPERIMENTAL
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select PXA_SSP
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help
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This enables using a PXA2xx SSP port as a SPI master controller.
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The driver can be configured to use any SSP port and additional
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documentation can be found a Documentation/spi/pxa2xx.
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config SPI_S3C24XX
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tristate "Samsung S3C24XX series SPI"
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depends on ARCH_S3C2410 && EXPERIMENTAL
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select SPI_BITBANG
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help
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SPI driver for Samsung S3C24XX series ARM SoCs
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config SPI_S3C24XX_GPIO
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tristate "Samsung S3C24XX series SPI by GPIO"
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depends on ARCH_S3C2410 && EXPERIMENTAL
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select SPI_BITBANG
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help
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SPI driver for Samsung S3C24XX series ARM SoCs using
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GPIO lines to provide the SPI bus. This can be used where
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the inbuilt hardware cannot provide the transfer mode, or
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where the board is using non hardware connected pins.
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config SPI_SH_SCI
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tristate "SuperH SCI SPI controller"
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depends on SUPERH
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select SPI_BITBANG
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help
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SPI driver for SuperH SCI blocks.
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config SPI_TXX9
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tristate "Toshiba TXx9 SPI controller"
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depends on GENERIC_GPIO && CPU_TX49XX
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help
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SPI driver for Toshiba TXx9 MIPS SoCs
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config SPI_XILINX
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tristate "Xilinx SPI controller"
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depends on XILINX_VIRTEX && EXPERIMENTAL
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select SPI_BITBANG
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help
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This exposes the SPI controller IP from the Xilinx EDK.
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See the "OPB Serial Peripheral Interface (SPI) (v1.00e)"
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Product Specification document (DS464) for hardware details.
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#
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# Add new SPI master controllers in alphabetical order above this line
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#
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#
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# There are lots of SPI device types, with sensors and memory
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# being probably the most widely used ones.
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#
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comment "SPI Protocol Masters"
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config SPI_AT25
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tristate "SPI EEPROMs from most vendors"
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depends on SYSFS
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help
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Enable this driver to get read/write support to most SPI EEPROMs,
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after you configure the board init code to know about each eeprom
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on your target board.
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This driver can also be built as a module. If so, the module
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will be called at25.
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config SPI_SPIDEV
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tristate "User mode SPI device driver support"
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depends on EXPERIMENTAL
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help
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This supports user mode SPI protocol drivers.
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Note that this application programming interface is EXPERIMENTAL
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and hence SUBJECT TO CHANGE WITHOUT NOTICE while it stabilizes.
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config SPI_TLE62X0
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tristate "Infineon TLE62X0 (for power switching)"
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depends on SYSFS
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help
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SPI driver for Infineon TLE62X0 series line driver chips,
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such as the TLE6220, TLE6230 and TLE6240. This provides a
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sysfs interface, with each line presented as a kind of GPIO
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exposing both switch control and diagnostic feedback.
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#
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# Add new SPI protocol masters in alphabetical order above this line
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#
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endif # SPI_MASTER
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# (slave support would go here)
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endif # SPI
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