pciconfig_read, pciconfig_write, pciconfig_iobase - pci device information handling
SYNOPSIS
#include <pci.h>int pciconfig_read(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf);int pciconfig_write(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf);int pciconfig_iobase(long which, unsigned long bus, unsigned long devfn);
DESCRIPTION
Most of the interaction with PCI devices is already handled by the
kernel PCI layer,
and thus these calls should not normally need to be accessed from userspace.
pciconfig_read()
Reads to
buf
from device
dev
at offset
off
value.
pciconfig_write()
Writes from
buf
to device
dev
at offset
off
value.
pciconfig_iobase()
You pass it a bus/devfn pair and get a physical address for either the
memory offset (for things like prep, this is 0xc0000000),
the IO base for PIO cycles, or the ISA holes if any.
RETURN VALUE
pciconfig_read()
On success zero is returned.
On error, -1 is returned and
errno
is set appropriately.
pciconfig_write()
On success zero is returned.
On error, -1 is returned and
errno
is set appropriately.
pciconfig_iobase()
Returns information on locations of various I/O
regions in physical memory according to the
which
value.
Values for
which
are:
IOBASE_BRIDGE_NUMBER,
IOBASE_MEMORY,
IOBASE_IO,
IOBASE_ISA_IO,
IOBASE_ISA_MEM.
ERRORS
EINVAL
len
value is invalid.
This does not apply to
pciconfig_iobase().
EIO
I/O error.
ENODEV
For
pciconfig_iobase(),
"hose" value is NULL.
For the other calls, could not find a slot.
ENOSYS
The system has not implemented these calls
(CONFIG_PCI
not defined).
EOPNOTSUPP
This return value is only valid for
pciconfig_iobase().
It is returned if the value for
which
is invalid.
EPERM
User does not have the CAP_SYS_ADMIN capability.
This does not apply to
pciconfig_iobase().
CONFORMING TO
These calls are Linux-specific, available since Linux 2.0.26/2.1.11.
This page is part of release 3.14 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
