Commit 54f9c4d0 authored by Alistair Popple's avatar Alistair Popple Committed by Corey Minyard

ipmi: add an Aspeed BT IPMI BMC driver

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: default avatarAlistair Popple <>
Signed-off-by: default avatarJeremy Kerr <>
Signed-off-by: default avatarJoel Stanley <>
[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
      - changed the compatible cell to "aspeed,ast2400-bt-bmc"
Signed-off-by: default avatarCédric Le Goater <>
Acked-by: default avatarArnd Bergmann <>
[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: default avatarRob Herring <>
Signed-off-by: default avatarCédric Le Goater <>
Signed-off-by: default avatarCorey Minyard <>
parent c6169de7
* Aspeed BT (Block Transfer) IPMI interface
The Aspeed SOCs (AST2400 and AST2500) are commonly used as BMCs
(BaseBoard Management Controllers) and the BT interface can be used to
perform in-band IPMI communication with their host.
Required properties:
- compatible : should be "aspeed,ast2400-bt-bmc"
- reg: physical address and size of the registers
Optional properties:
- interrupts: interrupt generated by the BT interface. without an
interrupt, the driver will operate in poll mode.
ibt@1e789140 {
compatible = "aspeed,ast2400-bt-bmc";
reg = <0x1e789140 0x18>;
interrupts = <8>;
......@@ -21,7 +21,7 @@ obj-y += video/
obj-y += idle/
# IPMI must come before ACPI in order to provide IPMI opregion support
obj-$(CONFIG_IPMI_HANDLER) += char/ipmi/
obj-y += char/ipmi/
obj-$(CONFIG_ACPI) += acpi/
obj-$(CONFIG_SFI) += sfi/
......@@ -76,3 +76,10 @@ config IPMI_POWEROFF
the IPMI management controller is capable of this.
tristate "BT IPMI bmc driver"
Provides a driver for the BT (Block Transfer) IPMI interface
found on Aspeed SOCs (AST2400 and AST2500). The driver
implements the BMC side of the BT interface.
......@@ -11,3 +11,4 @@ obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o
obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o
obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o
obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o
obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o
This diff is collapsed.
......@@ -74,6 +74,7 @@ header-y += bpf_common.h
header-y += bpf.h
header-y += bpqether.h
header-y += bsg.h
header-y += bt-bmc.h
header-y += btrfs.h
header-y += can.h
header-y += capability.h
* Copyright (c) 2015-2016, IBM Corporation.
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
#include <linux/ioctl.h>
#define __BT_BMC_IOCTL_MAGIC 0xb1
#endif /* _UAPI_LINUX_BT_BMC_H */
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