Commit 13f35ac1 authored by Neil Horman's avatar Neil Horman Committed by Wolfram Sang
Browse files

i2c: Adding support for Intel iSMT SMBus 2.0 host controller 



The iSMT (Intel SMBus Message Transport) supports multi-master I2C/SMBus,
as well as IPMI.  It's operation is DMA-based and utilizes descriptors to
initiate transactions on the bus.

The iSMT hardware can act as both a master and a target, although this
driver only supports being a master.

Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: default avatarBill Brown <bill.e.brown@intel.com>
Tested-by: default avatarSeth Heasley <seth.heasley@intel.com>
Reviewed-by: default avatarJean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarWolfram Sang <wolfram@the-dreams.de>
parent e7890297

Documentation/i2c/busses/i2c-ismt

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Kernel driver i2c-ismt



Supported adapters:

  * Intel S12xx series SOCs



Authors:

	Bill Brown <bill.e.brown@intel.com>





Module Parameters

-----------------



* bus_speed (unsigned int)

Allows changing of the bus speed.  Normally, the bus speed is set by the BIOS

and never needs to be changed.  However, some SMBus analyzers are too slow for

monitoring the bus during debug, thus the need for this module parameter.

Specify the bus speed in kHz.

Available bus frequency settings:

  0  no change

  80 kHz

  100 kHz

  400 kHz

  1000 kHz





Description

-----------



The S12xx series of SOCs have a pair of integrated SMBus 2.0 controllers

targeted primarily at the microserver and storage markets.



The S12xx series contain a pair of PCI functions.  An output of lspci will show

something similar to the following:



  00:13.0 System peripheral: Intel Corporation Centerton SMBus 2.0 Controller 0

  00:13.1 System peripheral: Intel Corporation Centerton SMBus 2.0 Controller 1

drivers/i2c/busses/Kconfig

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@@ -122,6 +122,16 @@ config I2C_ISCH 
	  This driver can also be built as a module. If so, the module

	  will be called i2c-isch.



config I2C_ISMT

	tristate "Intel iSMT SMBus Controller"

	depends on PCI && X86

	help

	  If you say yes to this option, support will be included for the Intel

	  iSMT SMBus host controller interface.



	  This driver can also be built as a module.  If so, the module will be

	  called i2c-ismt.



config I2C_PIIX4

	tristate "Intel PIIX4 and compatible (ATI/AMD/Serverworks/Broadcom/SMSC)"

	depends on PCI

drivers/i2c/busses/Makefile

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@@ -14,6 +14,7 @@ obj-$(CONFIG_I2C_AMD756_S4882) += i2c-amd756-s4882.o 
obj-$(CONFIG_I2C_AMD8111)	+= i2c-amd8111.o

obj-$(CONFIG_I2C_I801)		+= i2c-i801.o

obj-$(CONFIG_I2C_ISCH)		+= i2c-isch.o

obj-$(CONFIG_I2C_ISMT)		+= i2c-ismt.o

obj-$(CONFIG_I2C_NFORCE2)	+= i2c-nforce2.o

obj-$(CONFIG_I2C_NFORCE2_S4985)	+= i2c-nforce2-s4985.o

obj-$(CONFIG_I2C_PIIX4)		+= i2c-piix4.o

drivers/i2c/busses/i2c-ismt.c

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