1 /*
2 * Copyright (c) 2011 The Chromium OS Authors.
3 * (C) Copyright 2008,2009
4 * Graeme Russ, <graeme.russ@gmail.com>
5 *
6 * (C) Copyright 2002
7 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
8 *
9 * SPDX-License-Identifier: GPL-2.0+
10 */
11
12 #include <common.h>
13 #include <dm.h>
14 #include <errno.h>
15 #include <malloc.h>
16 #include <pci.h>
17 #include <asm/io.h>
18 #include <asm/pci.h>
19
20 DECLARE_GLOBAL_DATA_PTR;
21
pci_x86_read_config(struct udevice * bus,pci_dev_t bdf,uint offset,ulong * valuep,enum pci_size_t size)22 int pci_x86_read_config(struct udevice *bus, pci_dev_t bdf, uint offset,
23 ulong *valuep, enum pci_size_t size)
24 {
25 outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
26 switch (size) {
27 case PCI_SIZE_8:
28 *valuep = inb(PCI_REG_DATA + (offset & 3));
29 break;
30 case PCI_SIZE_16:
31 *valuep = inw(PCI_REG_DATA + (offset & 2));
32 break;
33 case PCI_SIZE_32:
34 *valuep = inl(PCI_REG_DATA);
35 break;
36 }
37
38 return 0;
39 }
40
pci_x86_write_config(struct udevice * bus,pci_dev_t bdf,uint offset,ulong value,enum pci_size_t size)41 int pci_x86_write_config(struct udevice *bus, pci_dev_t bdf, uint offset,
42 ulong value, enum pci_size_t size)
43 {
44 outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
45 switch (size) {
46 case PCI_SIZE_8:
47 outb(value, PCI_REG_DATA + (offset & 3));
48 break;
49 case PCI_SIZE_16:
50 outw(value, PCI_REG_DATA + (offset & 2));
51 break;
52 case PCI_SIZE_32:
53 outl(value, PCI_REG_DATA);
54 break;
55 }
56
57 return 0;
58 }
59
pci_assign_irqs(int bus,int device,u8 irq[4])60 void pci_assign_irqs(int bus, int device, u8 irq[4])
61 {
62 pci_dev_t bdf;
63 int func;
64 u16 vendor;
65 u8 pin, line;
66
67 for (func = 0; func < 8; func++) {
68 bdf = PCI_BDF(bus, device, func);
69 pci_read_config16(bdf, PCI_VENDOR_ID, &vendor);
70 if (vendor == 0xffff || vendor == 0x0000)
71 continue;
72
73 pci_read_config8(bdf, PCI_INTERRUPT_PIN, &pin);
74
75 /* PCI spec says all values except 1..4 are reserved */
76 if ((pin < 1) || (pin > 4))
77 continue;
78
79 line = irq[pin - 1];
80 if (!line)
81 continue;
82
83 debug("Assigning IRQ %d to PCI device %d.%x.%d (INT%c)\n",
84 line, bus, device, func, 'A' + pin - 1);
85
86 pci_write_config8(bdf, PCI_INTERRUPT_LINE, line);
87 }
88 }
89