54f9c4d077
This patch adds a simple device driver to expose the iBT interface on
Aspeed SOCs (AST2400 and AST2500) as a character device. Such SOCs are
commonly used as BMCs (BaseBoard Management Controllers) and this
driver implements the BMC side of the BT interface.
The BT (Block Transfer) interface is used to perform in-band IPMI
communication between a host and its BMC. Entire messages are buffered
before sending a notification to the other end, host or BMC, that
there is data to be read. Usually, the host emits requests and the BMC
responses but the specification provides a mean for the BMC to send
SMS Attention (BMC-to-Host attention or System Management Software
attention) messages.
For this purpose, the driver introduces a specific ioctl on the
device: 'BT_BMC_IOCTL_SMS_ATN' that can be used by the system running
on the BMC to signal the host of such an event.
The device name defaults to '/dev/ipmi-bt-host'
Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
[clg: - checkpatch fixes
- added a devicetree binding documentation
- replace 'bt_host' by 'bt_bmc' to reflect that the driver is
the BMC side of the IPMI BT interface
- renamed the device to 'ipmi-bt-host'
- introduced a temporary buffer to copy_{to,from}_user
- used platform_get_irq()
- moved the driver under drivers/char/ipmi/ but kept it as a misc
device
- changed the compatible cell to "aspeed,ast2400-bt-bmc"
]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
[clg: - checkpatch --strict fixes
- removed the use of devm_iounmap, devm_kfree in cleanup paths
- introduced an atomic-t to limit opens to 1
- introduced a mutex to protect write/read operations]
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
86 lines
2.7 KiB
Plaintext
86 lines
2.7 KiB
Plaintext
#
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# IPMI device configuration
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#
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menuconfig IPMI_HANDLER
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tristate 'IPMI top-level message handler'
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depends on HAS_IOMEM
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help
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This enables the central IPMI message handler, required for IPMI
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to work.
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IPMI is a standard for managing sensors (temperature,
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voltage, etc.) in a system.
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See <file:Documentation/IPMI.txt> for more details on the driver.
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If unsure, say N.
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if IPMI_HANDLER
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config IPMI_PANIC_EVENT
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bool 'Generate a panic event to all BMCs on a panic'
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help
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When a panic occurs, this will cause the IPMI message handler to
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generate an IPMI event describing the panic to each interface
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registered with the message handler.
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config IPMI_PANIC_STRING
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bool 'Generate OEM events containing the panic string'
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depends on IPMI_PANIC_EVENT
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help
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When a panic occurs, this will cause the IPMI message handler to
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generate IPMI OEM type f0 events holding the IPMB address of the
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panic generator (byte 4 of the event), a sequence number for the
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string (byte 5 of the event) and part of the string (the rest of the
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event). Bytes 1, 2, and 3 are the normal usage for an OEM event.
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You can fetch these events and use the sequence numbers to piece the
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string together.
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config IPMI_DEVICE_INTERFACE
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tristate 'Device interface for IPMI'
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help
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This provides an IOCTL interface to the IPMI message handler so
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userland processes may use IPMI. It supports poll() and select().
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config IPMI_SI
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tristate 'IPMI System Interface handler'
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help
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Provides a driver for System Interfaces (KCS, SMIC, BT).
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Currently, only KCS and SMIC are supported. If
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you are using IPMI, you should probably say "y" here.
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config IPMI_SSIF
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tristate 'IPMI SMBus handler (SSIF)'
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select I2C
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help
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Provides a driver for a SMBus interface to a BMC, meaning that you
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have a driver that must be accessed over an I2C bus instead of a
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standard interface. This module requires I2C support.
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config IPMI_POWERNV
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depends on PPC_POWERNV
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tristate 'POWERNV (OPAL firmware) IPMI interface'
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help
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Provides a driver for OPAL firmware-based IPMI interfaces.
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config IPMI_WATCHDOG
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tristate 'IPMI Watchdog Timer'
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help
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This enables the IPMI watchdog timer.
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config IPMI_POWEROFF
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tristate 'IPMI Poweroff'
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help
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This enables a function to power off the system with IPMI if
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the IPMI management controller is capable of this.
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endif # IPMI_HANDLER
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config ASPEED_BT_IPMI_BMC
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tristate "BT IPMI bmc driver"
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help
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Provides a driver for the BT (Block Transfer) IPMI interface
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found on Aspeed SOCs (AST2400 and AST2500). The driver
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implements the BMC side of the BT interface.
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