Eric Lee / smarc-fsl-linux-kernel

Blame view

Documentation/dcdbas.txt 3.62 KB
edit raw normal view history
90563ec41   Doug Warzecha   [PATCH] dcdbas: a... 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
 
  Overview
  
  The Dell Systems Management Base Driver provides a sysfs interface for
  systems management software such as Dell OpenManage to perform system
  management interrupts and host control actions (system power cycle or
  power off after OS shutdown) on certain Dell systems.
  
  Dell OpenManage requires this driver on the following Dell PowerEdge systems:
  300, 1300, 1400, 400SC, 500SC, 1500SC, 1550, 600SC, 1600SC, 650, 1655MC,
  700, and 750.  Other Dell software such as the open source libsmbios project
  is expected to make use of this driver, and it may include the use of this
  driver on other Dell systems.
  
  The Dell libsmbios project aims towards providing access to as much BIOS
  information as possible.  See http://linux.dell.com/libsmbios/main/ for
  more information about the libsmbios project.
  
  
  System Management Interrupt
  
  On some Dell systems, systems management software must access certain
  management information via a system management interrupt (SMI).  The SMI data
  buffer must reside in 32-bit address space, and the physical address of the
  buffer is required for the SMI.  The driver maintains the memory required for
  the SMI and provides a way for the application to generate the SMI.
  The driver creates the following sysfs entries for systems management
  software to perform these system management interrupts:
  
  /sys/devices/platform/dcdbas/smi_data
  /sys/devices/platform/dcdbas/smi_data_buf_phys_addr
  /sys/devices/platform/dcdbas/smi_data_buf_size
  /sys/devices/platform/dcdbas/smi_request
  
  Systems management software must perform the following steps to execute
  a SMI using this driver:
  
  1) Lock smi_data.
  2) Write system management command to smi_data.
  3) Write "1" to smi_request to generate a calling interface SMI or
     "2" to generate a raw SMI.
  4) Read system management command response from smi_data.
  5) Unlock smi_data.
  
  
  Host Control Action
  
  Dell OpenManage supports a host control feature that allows the administrator
  to perform a power cycle or power off of the system after the OS has finished
  shutting down.  On some Dell systems, this host control feature requires that
  a driver perform a SMI after the OS has finished shutting down.
  
  The driver creates the following sysfs entries for systems management software
  to schedule the driver to perform a power cycle or power off host control
  action after the system has finished shutting down:
  
  /sys/devices/platform/dcdbas/host_control_action
  /sys/devices/platform/dcdbas/host_control_smi_type
  /sys/devices/platform/dcdbas/host_control_on_shutdown
  
  Dell OpenManage performs the following steps to execute a power cycle or
  power off host control action using this driver:
  
  1) Write host control action to be performed to host_control_action.
  2) Write type of SMI that driver needs to perform to host_control_smi_type.
  3) Write "1" to host_control_on_shutdown to enable host control action.
  4) Initiate OS shutdown.
     (Driver will perform host control SMI when it is notified that the OS
     has finished shutting down.)
  
  
  Host Control SMI Type
  
  The following table shows the value to write to host_control_smi_type to
  perform a power cycle or power off host control action:
  
  PowerEdge System    Host Control SMI Type
  ----------------    ---------------------
        300             HC_SMITYPE_TYPE1
       1300             HC_SMITYPE_TYPE1
       1400             HC_SMITYPE_TYPE2
        500SC           HC_SMITYPE_TYPE2
       1500SC           HC_SMITYPE_TYPE2
       1550             HC_SMITYPE_TYPE2
        600SC           HC_SMITYPE_TYPE2
       1600SC           HC_SMITYPE_TYPE2
        650             HC_SMITYPE_TYPE2
       1655MC           HC_SMITYPE_TYPE2
        700             HC_SMITYPE_TYPE3
        750             HC_SMITYPE_TYPE3