2 .\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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26 .\" $FreeBSD: src/share/man/man9/pci.9,v 1.2.2.1 2003/06/13 01:04:17 hmp Exp $
27 .\" $DragonFly: src/share/man/man9/pci.9,v 1.6 2008/08/02 01:14:36 dillon Exp $
35 .Nm pci_write_config ,
36 .Nm pci_enable_busmaster ,
37 .Nm pci_disable_busmaster ,
40 .Nm pci_set_powerstate ,
41 .Nm pci_get_powerstate ,
49 .In bus/pci/pci_cfgreg.h
52 .Fn pci_write_config "device_t dev" "int reg" "u_int32_t val" "int width"
54 .Fn pci_enable_busmaster "device_t dev"
56 .Fn pci_disable_busmaster "device_t dev"
58 .Fn pci_enable_io "device_t dev" "int space"
60 .Fn pci_disable_io "device_t dev" "int space"
62 .Fn pci_set_powerstate "device_t dev" "int state"
64 .Fn pci_get_powerstate "device_t dev"
66 .Fn pci_read_config "device_t dev" "int reg" "int width"
68 .Fn pci_find_bsf "u_int8_t bus" "u_int8_t slot" "u_int8_t func"
70 .Fn pci_find_device "u_int16_t vendor" "u_int16_t device"
74 set of functions are used for managing PCI devices.
78 function is used to read data from the PCI configuration
85 specifying the size of the access.
89 function is used to write the value
91 to the PCI configuration
98 specifying the size of the access.
101 .Fn pci_enable_busmaster
102 function enables PCI bus mastering for the device
105 .Dv PCIM_CMD_BUSMASTEREN
110 .Fn pci_disable_busmaster
111 function clears this bit.
115 function enables memory or I/O port address decoding for the device
123 register appropriately.
126 function clears the appropriate bit.
129 argument specifies which resource is affected; this can be either
136 These functions should be used in preference to manually manipulating
137 the configuration space.
140 .Fn pci_get_powerstate
141 function returns the current ACPI power state of the device
143 If the device does not support power management capabilities, then the default
145 .Dv PCI_POWERSTATE_D0
147 The following power states are defined by ACPI:
148 .Bl -hang -width ".Dv PCI_POWERSTATE_UNKNOWN"
149 .It Dv PCI_POWERSTATE_D0
150 State in which device is on and running.
151 It is receiving full power from the system and delivering
152 full functionality to the user.
153 .It Dv PCI_POWERSTATE_D1
154 Class-specific low-power state in which device context may or
156 Buses in this state cannot do anything to the bus, to
157 force devices to lose context.
158 .It Dv PCI_POWERSTATE_D2
159 Class-specific low-power state in which device context may or
161 Attains greater power savings than
162 .Dv PCI_POWERSTATE_D1 .
163 Buses in this state can cause devices to loose some context.
166 be prepared for the bus to be in this state or higher.
167 .It Dv PCI_POWERSTATE_D3
168 State in which the device is off and not running.
169 Device context is lost, and power from the device can
171 .It Dv PCI_POWERSTATE_UNKNOWN
172 State of the device is unknown.
176 .Fn pci_set_powerstate
177 function is used to transition the device
179 to the ACPI power state
181 It checks to see if the device is PCI 2.2 compliant.
183 capabilities pointer to determine which power states the device supports.
184 If the device does not have power management capabilities, the default state
186 .Dv PCI_POWERSTATE_D0
191 function looks up the
193 of a PCI device, given its
201 function looks up the
203 of a PCI device, given its
208 Note that there can be multiple matches for this search; this function
209 only returns the first matching device.
210 .Sh IMPLEMENTATION NOTES
213 type varies according to the size of the PCI bus address
214 space on the target architecture.
218 .Xr bus_alloc_resource 9 ,
220 .Xr bus_release_resource 9 ,
221 .Xr BUS_SETUP_INTR 9 ,
222 .Xr BUS_TEARDOWN_INTR 9 ,
228 .%B FreeBSD Developers' Handbook
230 .%O http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/developers-handbook/
235 .%B PCI System Architecture
238 .%O ISBN 0-201-30974-2
241 This man page was written by
242 .An Bruce M Simpson Aq bms@spc.org .
244 This manual page does not yet document PAE and how it affects memory-space
245 mapping of PCI devices.