1 .\" pnp(4) - manual page for PnP device support
4 .\" Copyright (c) 1997 Luigi Rizzo
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31 .\" $FreeBSD: src/share/man/man4/man4.i386/pnp.4,v 1.5.2.7 2001/09/25 23:40:30 yokota Exp $
38 .Nd support for PnP devices
42 Support for PnP devices in
44 allows the user to override the
45 configuration of PnP cards, and device drivers to fetch/modify
46 parameters in the card's configuration space.
48 The manual override mechanism requires the kernel to be compiled with
49 .Cd options USERCONFIG .
50 In this case, the kernel keeps a table of fixed size (20 entries as a
51 default) where configuration data are held for PnP devices.
53 PnP card can contain several independent devices (5 or 6 is not
56 By booting the kernel with the
58 flag, commands are available to
59 modify the configuration of PnP cards.
60 Commands start with the
63 where CSN and LDN are the Card Select Number and Logical Device Number
64 associated to the device.
65 Following this sequence any combination of
66 the following commands can be used:
67 .Bl -tag -width "mmmmmmmmmm""
69 Sets the irq line for interrupt 0 or 1 on the card.
73 Sets the drq channel used for DMA 0 or 1 on the card.
75 the channel is unused.
77 Sets the base address for the N-th port's range (N=0..7). address=0
78 means that the port is not used.
80 Sets the base address for the N-th memory's range (N=0..3). address=0
81 means that the memory range is not used.
83 Makes the PnP device use the configuration set by the BIOS.
85 is the default, and is generally ok if your BIOS has PnP support.
86 If BIOS is used, then other parameters are ignored except "flags".
88 Makes the PnP device to use the configuration specified in this entry.
90 Enables the PnP device.
92 Disables the PnP device.
94 Frees the entry used for the device, so that it can be used for
95 another device with a different CSN/LDN pair.
97 Sets the value of a 32-bit flags entry which is passed to the device
99 This can be used to set special operation modes (e.g. SB vs. WSS
100 emulation on some sound cards, etc.).
103 The current content of the table can be printed using the
105 command in userconfig.
106 In addition to modifications done by the user,
107 the table contains an entry for
108 all logical devices accessed by a PnP device driver.
111 the table will be saved to the boot image on the filesystem by the
114 .Sh DEVICE DRIVER SUPPORT FOR PnP
115 PnP devices are automatically recognized and configured by the kernel.
116 A PnP device is identified by the following data structure:
120 char *(*pd_probe ) (u_long csn, u_long vendor_id);
121 void (*pd_attach ) (u_long csn, u_long vend_id, char * name,
122 struct isa_device *dev);
125 struct isa_device dev;
129 The probe routine must check that the vendor_id passed is a
130 recognized one, that any necessary devices on the card are enabled,
131 and returns a NULL value in case of failure or a non-NULL value
132 (generally a pointer to the device name) unpon success. In the probe
133 routine, the function
135 can be used to check that the logical devices are enabled.
137 The attach routine should do all the necessary initialization, enable
138 the PnP card to ISA accesses, fetch the configuration, and call the ISA
139 driver for the device.
141 The following routines and data structures can be used:
142 .Bl -tag -width "xxxxxxxxxx"
143 .It Dv struct pnp_cinfo
144 This data structure (defined in /sys/i386/isa/pnp.h) contains all
145 informations related to a PnP logical device.
146 .It Fn read_pnp_parms "struct pnp_cinfo *d" "int ldn"
147 This function returns the configuration of the requested
149 It is not possible to specify a CSN since this function
150 is only meant to be used during probe and attach routines
151 .It Fn write_pnp_parms "struct pnp_cinfo *d" "int ldn"
152 This function sets the parameters of the requested logical device.
154 the same time, it updates the entry in the kernel override table.
155 Device drivers in general should
157 modify the configuration of a device, since either the BIOS or the user
158 (through userconfig) should know better what to do.
161 .Em should not enable
162 a logical device which has
164 since this would defeat the override mechanism in userconfig.
166 drivers may disable a logical device, or a port range, etc, but should
167 do so only that particular device or parameter is known to cause
169 .It Fn enable_pnp_card void
172 be used in the attach routine
174 before accessing the card's ISA ports/memory address ranges.
179 There is no support for visual configuration of PnP devices.
180 It would be nice to have commands in userconfig to fetch the
181 configuration of PnP devices.
184 PnP support was written by
186 based on initial work done by
191 driver first appeared in