linux/Documentation/dcdbas.txt
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   1Overview
   2
   3The Dell Systems Management Base Driver provides a sysfs interface for
   4systems management software such as Dell OpenManage to perform system
   5management interrupts and host control actions (system power cycle or
   6power off after OS shutdown) on certain Dell systems.
   7
   8Dell OpenManage requires this driver on the following Dell PowerEdge systems:
   9300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC,
  10700, and 750.  Other Dell software such as the open source libsmbios project
  11is expected to make use of this driver, and it may include the use of this
  12driver on other Dell systems.
  13
  14The Dell libsmbios project aims towards providing access to as much BIOS
  15information as possible.  See http://linux.dell.com/libsmbios/main/ for
  16more information about the libsmbios project.
  17
  18
  19System Management Interrupt
  20
  21On some Dell systems, systems management software must access certain
  22management information via a system management interrupt (SMI).  The SMI data
  23buffer must reside in 32-bit address space, and the physical address of the
  24buffer is required for the SMI.  The driver maintains the memory required for
  25the SMI and provides a way for the application to generate the SMI.
  26The driver creates the following sysfs entries for systems management
  27software to perform these system management interrupts:
  28
  29/sys/devices/platform/dcdbas/smi_data
  30/sys/devices/platform/dcdbas/smi_data_buf_phys_addr
  31/sys/devices/platform/dcdbas/smi_data_buf_size
  32/sys/devices/platform/dcdbas/smi_request
  33
  34Systems management software must perform the following steps to execute
  35a SMI using this driver:
  36
  371) Lock smi_data.
  382) Write system management command to smi_data.
  393) Write "1" to smi_request to generate a calling interface SMI or
  40   "2" to generate a raw SMI.
  414) Read system management command response from smi_data.
  425) Unlock smi_data.
  43
  44
  45Host Control Action
  46
  47Dell OpenManage supports a host control feature that allows the administrator
  48to perform a power cycle or power off of the system after the OS has finished
  49shutting down.  On some Dell systems, this host control feature requires that
  50a driver perform a SMI after the OS has finished shutting down.
  51
  52The driver creates the following sysfs entries for systems management software
  53to schedule the driver to perform a power cycle or power off host control
  54action after the system has finished shutting down:
  55
  56/sys/devices/platform/dcdbas/host_control_action
  57/sys/devices/platform/dcdbas/host_control_smi_type
  58/sys/devices/platform/dcdbas/host_control_on_shutdown
  59
  60Dell OpenManage performs the following steps to execute a power cycle or
  61power off host control action using this driver:
  62
  631) Write host control action to be performed to host_control_action.
  642) Write type of SMI that driver needs to perform to host_control_smi_type.
  653) Write "1" to host_control_on_shutdown to enable host control action.
  664) Initiate OS shutdown.
  67   (Driver will perform host control SMI when it is notified that the OS
  68   has finished shutting down.)
  69
  70
  71Host Control SMI Type
  72
  73The following table shows the value to write to host_control_smi_type to
  74perform a power cycle or power off host control action:
  75
  76PowerEdge System    Host Control SMI Type
  77----------------    ---------------------
  78      300             HC_SMITYPE_TYPE1
  79     1300             HC_SMITYPE_TYPE1
  80     1400             HC_SMITYPE_TYPE2
  81      500SC           HC_SMITYPE_TYPE2
  82     1500SC           HC_SMITYPE_TYPE2
  83     1550             HC_SMITYPE_TYPE2
  84      600SC           HC_SMITYPE_TYPE2
  85     1600SC           HC_SMITYPE_TYPE2
  86      650             HC_SMITYPE_TYPE2
  87     1655MC           HC_SMITYPE_TYPE2
  88      700             HC_SMITYPE_TYPE3
  89      750             HC_SMITYPE_TYPE3
  90
  91
  92
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