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Linux/arch/x86/pci/early.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/kernel.h>
  3 #include <linux/pci.h>
  4 #include <asm/pci-direct.h>
  5 #include <asm/io.h>
  6 #include <asm/pci_x86.h>
  7 
  8 /* Direct PCI access. This is used for PCI accesses in early boot before
  9    the PCI subsystem works. */
 10 
 11 u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
 12 {
 13         u32 v;
 14         outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 15         v = inl(0xcfc);
 16         return v;
 17 }
 18 
 19 u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
 20 {
 21         u8 v;
 22         outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 23         v = inb(0xcfc + (offset&3));
 24         return v;
 25 }
 26 
 27 u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
 28 {
 29         u16 v;
 30         outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 31         v = inw(0xcfc + (offset&2));
 32         return v;
 33 }
 34 
 35 void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
 36                                     u32 val)
 37 {
 38         outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 39         outl(val, 0xcfc);
 40 }
 41 
 42 void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
 43 {
 44         outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 45         outb(val, 0xcfc + (offset&3));
 46 }
 47 
 48 void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
 49 {
 50         outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
 51         outw(val, 0xcfc + (offset&2));
 52 }
 53 
 54 int early_pci_allowed(void)
 55 {
 56         return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
 57                         PCI_PROBE_CONF1;
 58 }
 59 
 60 

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