1 // PCI config space access functions.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
8 #include "pci.h" // pci_config_writel
9 #include "ioport.h" // outl
10 #include "util.h" // dprintf
11 #include "config.h" // CONFIG_*
12 #include "pci_regs.h" // PCI_VENDOR_ID
13 #include "farptr.h" // SET_VAR
15 void pci_config_writel(u16 bdf, u32 addr, u32 val)
17 outl(0x80000000 | (bdf << 8) | (addr & 0xfc), PORT_PCI_CMD);
18 outl(val, PORT_PCI_DATA);
21 void pci_config_writew(u16 bdf, u32 addr, u16 val)
23 outl(0x80000000 | (bdf << 8) | (addr & 0xfc), PORT_PCI_CMD);
24 outw(val, PORT_PCI_DATA + (addr & 2));
27 void pci_config_writeb(u16 bdf, u32 addr, u8 val)
29 outl(0x80000000 | (bdf << 8) | (addr & 0xfc), PORT_PCI_CMD);
30 outb(val, PORT_PCI_DATA + (addr & 3));
33 u32 pci_config_readl(u16 bdf, u32 addr)
35 outl(0x80000000 | (bdf << 8) | (addr & 0xfc), PORT_PCI_CMD);
36 return inl(PORT_PCI_DATA);
39 u16 pci_config_readw(u16 bdf, u32 addr)
41 outl(0x80000000 | (bdf << 8) | (addr & 0xfc), PORT_PCI_CMD);
42 return inw(PORT_PCI_DATA + (addr & 2));
45 u8 pci_config_readb(u16 bdf, u32 addr)
47 outl(0x80000000 | (bdf << 8) | (addr & 0xfc), PORT_PCI_CMD);
48 return inb(PORT_PCI_DATA + (addr & 3));
52 pci_next(int bdf, int *pmax)
54 if (pci_bdf_to_fn(bdf) == 1
55 && (pci_config_readb(bdf-1, PCI_HEADER_TYPE) & 0x80) == 0)
56 // Last found device wasn't a multi-function device - skip to
65 u16 v = pci_config_readw(bdf, PCI_VENDOR_ID);
66 if (v != 0x0000 && v != 0xffff)
70 if (pci_bdf_to_fn(bdf) == 0)
76 // Check if found device is a bridge.
77 u32 v = pci_config_readb(bdf, PCI_HEADER_TYPE);
79 if (v == PCI_HEADER_TYPE_BRIDGE || v == PCI_HEADER_TYPE_CARDBUS) {
80 v = pci_config_readl(bdf, PCI_PRIMARY_BUS);
81 int newmax = (v & 0xff00) + 0x0100;
89 // Search for a device with the specified vendor and device ids.
91 pci_find_device(u16 vendid, u16 devid)
93 u32 id = (devid << 16) | vendid;
95 foreachpci(bdf, max) {
96 u32 v = pci_config_readl(bdf, PCI_VENDOR_ID);
105 // Search for a device with the specified class id.
107 pci_find_class(u16 classid)
110 foreachpci(bdf, max) {
111 u16 v = pci_config_readw(bdf, PCI_CLASS_DEVICE);