Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <asm/pci-direct.h>
|
|
#include <asm/io.h>
|
|
#include <asm/pci_x86.h>
|
|
|
|
/* Direct PCI access. This is used for PCI accesses in early boot before
|
|
the PCI subsystem works. */
|
|
|
|
u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
|
|
{
|
|
u32 v;
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
v = inl(0xcfc);
|
|
return v;
|
|
}
|
|
|
|
u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
|
|
{
|
|
u8 v;
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
v = inb(0xcfc + (offset&3));
|
|
return v;
|
|
}
|
|
|
|
u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
|
|
{
|
|
u16 v;
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
v = inw(0xcfc + (offset&2));
|
|
return v;
|
|
}
|
|
|
|
void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
|
|
u32 val)
|
|
{
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
outl(val, 0xcfc);
|
|
}
|
|
|
|
void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
|
|
{
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
outb(val, 0xcfc + (offset&3));
|
|
}
|
|
|
|
void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
|
|
{
|
|
outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
|
|
outw(val, 0xcfc + (offset&2));
|
|
}
|
|
|
|
int early_pci_allowed(void)
|
|
{
|
|
return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
|
|
PCI_PROBE_CONF1;
|
|
}
|
|
|