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 GPLv3 license.
8 #include "pci.h" // MaxBDF
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));
55 // Find the maximum bus number.
59 dprintf(3, "Scan for max PCI bus\n");
63 for (bdf=0; bdf < max; bdf++) {
64 u32 v = pci_config_readl(bdf, PCI_VENDOR_ID);
65 if (v == 0xffffffff || v == 0x00000000
66 || v == 0x0000ffff || v == 0xffff0000)
69 v = pci_config_readb(bdf, PCI_HEADER_TYPE);
71 if (v != PCI_HEADER_TYPE_BRIDGE && v != PCI_HEADER_TYPE_CARDBUS)
74 v = pci_config_readl(bdf, PCI_PRIMARY_BUS);
75 int newmax = (v & 0xff00) + 0x0100;
79 SET_VAR(CS, MaxBDF, max);
81 dprintf(1, "Found %d PCI buses\n", pci_bdf_to_bus(max));
84 // Search for a device with the specified vendor and device ids.
86 pci_find_device(u16 vendid, u16 devid, int start_bdf)
88 u32 id = (devid << 16) | vendid;
89 int max = GET_VAR(CS, MaxBDF);
91 for (bdf=start_bdf; bdf < max; bdf++) {
92 u32 v = pci_config_readl(bdf, PCI_VENDOR_ID);
101 // Search for a device with the specified class id and prog-if.
103 pci_find_classprog(u32 classprog, int start_bdf)
105 int max = GET_VAR(CS, MaxBDF);
107 for (bdf=start_bdf; bdf < max; bdf++) {
108 u32 v = pci_config_readl(bdf, PCI_CLASS_REVISION);
109 if ((v>>8) != classprog)
117 // Search for a device with the specified class id.
119 pci_find_class(u16 classid, int start_bdf)
121 int max = GET_VAR(CS, MaxBDF);
123 for (bdf=start_bdf; bdf < max; bdf++) {
124 u16 v = pci_config_readw(bdf, PCI_CLASS_DEVICE);