Eric Lee / smarc-fsl-linux-kernel

14 Dec, 2010

1 commit

  • e92b297cc   IPMI/ACPI: Add the IPMI opregion driver to enable ACPI to access BMC controller ... Browse Code ยป

    ACPI 4.0 spec adds the ACPI IPMI opregion, which means that the ACPI AML
    code can also communicate with the BMC controller. This is to install
    the ACPI IPMI opregion and enable the ACPI to access the BMC controller
    through the IPMI message.

    It will create IPMI user interface for every IPMI device detected
    in ACPI namespace and install the corresponding IPMI opregion space handler.
    Then it can enable ACPI to access the BMC controller through the IPMI
    message.

    The following describes how to process the IPMI request in IPMI space handler:
    1. format the IPMI message based on the request in AML code.
    IPMI system address. Now the address type is SYSTEM_INTERFACE_ADDR_TYPE
    IPMI net function & command
    IPMI message payload
    2. send the IPMI message by using the function of ipmi_request_settime
    3. wait for the completion of IPMI message. It can be done in different
    routes: One is in handled in IPMI user recv callback function. Another is
    handled in timeout function.
    4. format the IPMI response and return it to ACPI AML code.

    At the same time it also addes the module dependency. The ACPI IPMI opregion
    will depend on the IPMI subsystem.

    Signed-off-by: Zhao Yakui
    cc: Bjorn Helgaas
    Signed-off-by: Corey Minyard
    Signed-off-by: Len Brown

    Zhao Yakui