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 <log.h>
15 #include <malloc.h>
16 #include <pci.h>
17 #include <asm/io.h>
18 #include <asm/pci.h>
19
pci_x86_read_config(pci_dev_t bdf,uint offset,ulong * valuep,enum pci_size_t size)20 int pci_x86_read_config(pci_dev_t bdf, uint offset, ulong *valuep,
21 enum pci_size_t size)
22 {
23 outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
24 switch (size) {
25 case PCI_SIZE_8:
26 *valuep = inb(PCI_REG_DATA + (offset & 3));
27 break;
28 case PCI_SIZE_16:
29 *valuep = inw(PCI_REG_DATA + (offset & 2));
30 break;
31 case PCI_SIZE_32:
32 *valuep = inl(PCI_REG_DATA);
33 break;
34 }
35
36 return 0;
37 }
38
pci_x86_write_config(pci_dev_t bdf,uint offset,ulong value,enum pci_size_t size)39 int pci_x86_write_config(pci_dev_t bdf, uint offset, ulong value,
40 enum pci_size_t size)
41 {
42 outl(bdf | (offset & 0xfc) | PCI_CFG_EN, PCI_REG_ADDR);
43 switch (size) {
44 case PCI_SIZE_8:
45 outb(value, PCI_REG_DATA + (offset & 3));
46 break;
47 case PCI_SIZE_16:
48 outw(value, PCI_REG_DATA + (offset & 2));
49 break;
50 case PCI_SIZE_32:
51 outl(value, PCI_REG_DATA);
52 break;
53 }
54
55 return 0;
56 }
57
pci_x86_clrset_config(pci_dev_t bdf,uint offset,ulong clr,ulong set,enum pci_size_t size)58 int pci_x86_clrset_config(pci_dev_t bdf, uint offset, ulong clr, ulong set,
59 enum pci_size_t size)
60 {
61 ulong value;
62 int ret;
63
64 ret = pci_x86_read_config(bdf, offset, &value, size);
65 if (ret)
66 return ret;
67 value &= ~clr;
68 value |= set;
69
70 return pci_x86_write_config(bdf, offset, value, size);
71 }
72
pci_assign_irqs(int bus,int device,u8 irq[4])73 void pci_assign_irqs(int bus, int device, u8 irq[4])
74 {
75 pci_dev_t bdf;
76 int func;
77 u16 vendor;
78 u8 pin, line;
79
80 for (func = 0; func < 8; func++) {
81 bdf = PCI_BDF(bus, device, func);
82 pci_read_config16(bdf, PCI_VENDOR_ID, &vendor);
83 if (vendor == 0xffff || vendor == 0x0000)
84 continue;
85
86 pci_read_config8(bdf, PCI_INTERRUPT_PIN, &pin);
87
88 /* PCI spec says all values except 1..4 are reserved */
89 if ((pin < 1) || (pin > 4))
90 continue;
91
92 line = irq[pin - 1];
93 if (!line)
94 continue;
95
96 debug("Assigning IRQ %d to PCI device %d.%x.%d (INT%c)\n",
97 line, bus, device, func, 'A' + pin - 1);
98
99 pci_write_config8(bdf, PCI_INTERRUPT_LINE, line);
100 }
101 }
102