1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2011 The Chromium OS Authors.
4 * (C) Copyright 2008,2009
5 * Graeme Russ, <graeme.russ@gmail.com>
6 *
7 * (C) Copyright 2002
8 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
9 */
10
11 #include <common.h>
12 #include <dm.h>
13 #include <errno.h>
14 #include <malloc.h>
15 #include <pci.h>
16 #include <asm/io.h>
17 #include <asm/pci.h>
18
pci_x86_read_config(struct udevice * bus,pci_dev_t bdf,uint offset,ulong * valuep,enum pci_size_t size)19 int pci_x86_read_config(struct udevice *bus, pci_dev_t bdf, uint offset,
20 ulong *valuep, enum pci_size_t size)
21 {
22 outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
23 switch (size) {
24 case PCI_SIZE_8:
25 *valuep = inb(PCI_REG_DATA + (offset & 3));
26 break;
27 case PCI_SIZE_16:
28 *valuep = inw(PCI_REG_DATA + (offset & 2));
29 break;
30 case PCI_SIZE_32:
31 *valuep = inl(PCI_REG_DATA);
32 break;
33 }
34
35 return 0;
36 }
37
pci_x86_write_config(struct udevice * bus,pci_dev_t bdf,uint offset,ulong value,enum pci_size_t size)38 int pci_x86_write_config(struct udevice *bus, pci_dev_t bdf, uint offset,
39 ulong value, enum pci_size_t size)
40 {
41 outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
42 switch (size) {
43 case PCI_SIZE_8:
44 outb(value, PCI_REG_DATA + (offset & 3));
45 break;
46 case PCI_SIZE_16:
47 outw(value, PCI_REG_DATA + (offset & 2));
48 break;
49 case PCI_SIZE_32:
50 outl(value, PCI_REG_DATA);
51 break;
52 }
53
54 return 0;
55 }
56
pci_assign_irqs(int bus,int device,u8 irq[4])57 void pci_assign_irqs(int bus, int device, u8 irq[4])
58 {
59 pci_dev_t bdf;
60 int func;
61 u16 vendor;
62 u8 pin, line;
63
64 for (func = 0; func < 8; func++) {
65 bdf = PCI_BDF(bus, device, func);
66 pci_read_config16(bdf, PCI_VENDOR_ID, &vendor);
67 if (vendor == 0xffff || vendor == 0x0000)
68 continue;
69
70 pci_read_config8(bdf, PCI_INTERRUPT_PIN, &pin);
71
72 /* PCI spec says all values except 1..4 are reserved */
73 if ((pin < 1) || (pin > 4))
74 continue;
75
76 line = irq[pin - 1];
77 if (!line)
78 continue;
79
80 debug("Assigning IRQ %d to PCI device %d.%x.%d (INT%c)\n",
81 line, bus, device, func, 'A' + pin - 1);
82
83 pci_write_config8(bdf, PCI_INTERRUPT_LINE, line);
84 }
85 }
86