2 .\" Copyright (c) 2005 Bruce M Simpson <bms@FreeBSD.org>
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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
50 .Fn pci_write_config "device_t dev" "int reg" "uint32_t val" "int width"
52 .Fn pci_enable_busmaster "device_t dev"
54 .Fn pci_disable_busmaster "device_t dev"
56 .Fn pci_enable_io "device_t dev" "int space"
58 .Fn pci_disable_io "device_t dev" "int space"
60 .Fn pci_set_powerstate "device_t dev" "int state"
62 .Fn pci_get_powerstate "device_t dev"
64 .Fn pci_read_config "device_t dev" "int reg" "int width"
66 .Fn pci_find_bsf "uint8_t bus" "uint8_t slot" "uint8_t func"
68 .Fn pci_find_device "uint16_t vendor" "uint16_t device"
72 set of functions are used for managing PCI devices.
76 function is used to read data from the PCI configuration
83 specifying the size of the access.
87 function is used to write the value
89 to the PCI configuration
96 specifying the size of the access.
99 .Fn pci_enable_busmaster
100 function enables PCI bus mastering for the device
103 .Dv PCIM_CMD_BUSMASTEREN
108 .Fn pci_disable_busmaster
109 function clears this bit.
113 function enables memory or I/O port address decoding for the device
121 register appropriately.
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 ".Dv 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 Busses in this state cannot do anything to the bus, to
155 force devices to lose 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 Busses in this state can cause devices to lose 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
198 number actually refers to the number of the device on the bus,
199 which does not necessarily indicate its geographic location
200 in terms of a physical slot.
204 function looks up the
206 of a PCI device, given its
211 Note that there can be multiple matches for this search; this function
212 only returns the first matching device.
213 .Sh IMPLEMENTATION NOTES
216 type varies according to the size of the PCI bus address
217 space on the target architecture.
221 .Xr bus_alloc_resource 9 ,
223 .Xr bus_release_resource 9 ,
224 .Xr bus_setup_intr 9 ,
225 .Xr bus_teardown_intr 9 ,
231 .%B FreeBSD Developers' Handbook
233 .%O http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/developers-handbook/
238 .%B PCI System Architecture
241 .%O ISBN 0-201-30974-2
244 This manual page was written by
245 .An Bruce M Simpson Aq bms@FreeBSD.org .
247 The kernel PCI code has a number of references to
249 These do not refer to the geographic location of PCI devices,
250 but to the device number assigned by the combination of the PCI IDSEL
251 mechanism and the platform firmware.
252 This should be taken note of when working with the kernel PCI code.