2 .\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
3 .\" All rights reserved.
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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 $
34 .Nm pci_write_config ,
35 .Nm pci_enable_busmaster ,
36 .Nm pci_disable_busmaster ,
39 .Nm pci_set_powerstate ,
40 .Nm pci_get_powerstate ,
48 .In machine/pci_cfgreg.h
51 .Fn pci_write_config "device_t dev" "int reg" "u_int32_t val" "int width"
53 .Fn pci_enable_busmaster "device_t dev"
55 .Fn pci_disable_busmaster "device_t dev"
57 .Fn pci_enable_io "device_t dev" "int space"
59 .Fn pci_disable_io "device_t dev" "int space"
61 .Fn pci_set_powerstate "device_t dev" "int state"
63 .Fn pci_get_powerstate "device_t dev"
65 .Fn pci_read_config "device_t dev" "int reg" "int width"
67 .Fn pci_find_bsf "u_int8_t" "u_int8_t" "u_int8_t"
69 .Fn pci_find_device "u_int16_t" "u_int16_t"
73 set of functions are used for managing PCI devices.
77 function is used to read data from the PCI configuration
84 specifying the size of the access.
88 function is used to write the value
90 to the PCI configuration
97 specifying the size of the access.
100 .Fn pci_enable_busmaster
101 function enables PCI bus mastering for the device
104 .Dv PCIM_CMD_BUSMASTEREN
109 .Fn pci_disable_busmaster
110 function clears this bit.
114 function enables memory or I/O port address decoding for the device
122 register appropriately. The
124 function clears the appropriate bit.
127 argument specifies which resource is affected; this can be either
134 These functions should be used in preference to manually manipulating
135 the configuration space.
138 .Fn pci_get_powerstate
139 function returns the current ACPI power state of the device
141 If the device does not support power management capabilities, then the default
143 .Dv PCI_POWERSTATE_D0
145 The following power states are defined by ACPI:
146 .Bl -hang -width PCI_POWERSTATE_UNKNOWN
147 .It Dv PCI_POWERSTATE_D0
148 State in which device is on and running.
149 It is receiving full power from the system and delivering
150 full functionality to the user.
151 .It Dv PCI_POWERSTATE_D1
152 Class-specific low-power state in which device context may or
154 Buses in this state cannot do anything to the bus, to
155 force devices to loose context.
156 .It Dv PCI_POWERSTATE_D2
157 Class-specific low-power state in which device context may or
159 Attains greater power savings than
160 .Dv PCI_POWERSTATE_D1 .
161 Buses in this state can cause devices to loose some context.
164 be prepared for the bus to be in this state or higher.
165 .It Dv PCI_POWERSTATE_D3
166 State in which the device is off and not running.
167 Device context is lost, and power from the device can
169 .It Dv PCI_POWERSTATE_UNKNOWN
170 State of the device is unknown.
174 .Fn pci_set_powerstate
175 function is used to transition the device
177 to the ACPI power state
179 It checks to see if the device is PCI 2.2 compliant.
181 capabilities pointer to determine which power states the device supports.
182 If the device does not have power management capabilities, the default state
184 .Dv PCI_POWERSTATE_D0
189 function looks up the
191 of a PCI device, given its
199 function looks up the
201 of a PCI device, given its
205 IDs. Note that there can be multiple matches for this search; this function
206 only returns the first matching device.
207 .Sh IMPLEMENTATION NOTES
210 type is varies according to the size of the PCI bus address
211 space on the target architecture.
215 .Xr bus_alloc_resource 9 ,
217 .Xr bus_release_resource 9 ,
218 .Xr bus_setup_intr 9 ,
219 .Xr bus_teardown_intr 9 ,
225 .%B FreeBSD Developers' Handbook
227 .%O http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/developers-handbook/
232 .%B PCI System Architecture
235 .%O ISBN 0-201-30974-2
238 This man page was written by
239 .An Bruce M Simpson Aq bms@spc.org .
241 This manual page does not yet document PAE and how it affects memory-space
242 mapping of PCI devices.