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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 void early_dump_pci_device(u8 bus, u8 slot, u8 func)
 61 {
 62         u32 value[256 / 4];
 63         int i;
 64 
 65         pr_info("pci 0000:%02x:%02x.%d config space:\n", bus, slot, func);
 66 
 67         for (i = 0; i < 256; i += 4)
 68                 value[i / 4] = read_pci_config(bus, slot, func, i);
 69 
 70         print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 16, 1, value, 256, false);
 71 }
 72 
 73 void early_dump_pci_devices(void)
 74 {
 75         unsigned bus, slot, func;
 76 
 77         if (!early_pci_allowed())
 78                 return;
 79 
 80         for (bus = 0; bus < 256; bus++) {
 81                 for (slot = 0; slot < 32; slot++) {
 82                         for (func = 0; func < 8; func++) {
 83                                 u32 class;
 84                                 u8 type;
 85 
 86                                 class = read_pci_config(bus, slot, func,
 87                                                         PCI_CLASS_REVISION);
 88                                 if (class == 0xffffffff)
 89                                         continue;
 90 
 91                                 early_dump_pci_device(bus, slot, func);
 92 
 93                                 if (func == 0) {
 94                                         type = read_pci_config_byte(bus, slot,
 95                                                                     func,
 96                                                                PCI_HEADER_TYPE);
 97                                         if (!(type & 0x80))
 98                                                 break;
 99                                 }
100                         }
101                 }
102         }
103 }
104 

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