xref: /openbmc/u-boot/arch/x86/cpu/pci.c (revision e8f80a5a)
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