xref: /openbmc/u-boot/arch/x86/cpu/pci.c (revision 8df37888)
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 
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 
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 
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