1/*
2 *	Low-Level PCI Support for SGI Visual Workstation
3 *
4 *	(c) 1999--2000 Martin Mares <mj@ucw.cz>
5 */
6
7#include <linux/config.h>
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/pci.h>
12#include <linux/init.h>
13#include <linux/irq.h>
14
15#include <asm/smp.h>
16#include <asm/lithium.h>
17#include <asm/io.h>
18
19#include "pci-i386.h"
20
21unsigned int pci_probe = 0;
22
23/*
24 *  The VISWS uses configuration access type 1 only.
25 */
26
27#define CONFIG_CMD(dev, where)   (0x80000000 | (dev->bus->number << 16) | (dev->devfn << 8) | (where & ~3))
28
29static int pci_conf1_read_config_byte(struct pci_dev *dev, int where, u8 *value)
30{
31	outl(CONFIG_CMD(dev,where), 0xCF8);
32	*value = inb(0xCFC + (where&3));
33	return PCIBIOS_SUCCESSFUL;
34}
35
36static int pci_conf1_read_config_word(struct pci_dev *dev, int where, u16 *value)
37{
38	outl(CONFIG_CMD(dev,where), 0xCF8);
39	*value = inw(0xCFC + (where&2));
40	return PCIBIOS_SUCCESSFUL;
41}
42
43static int pci_conf1_read_config_dword(struct pci_dev *dev, int where, u32 *value)
44{
45	outl(CONFIG_CMD(dev,where), 0xCF8);
46	*value = inl(0xCFC);
47	return PCIBIOS_SUCCESSFUL;
48}
49
50static int pci_conf1_write_config_byte(struct pci_dev *dev, int where, u8 value)
51{
52	outl(CONFIG_CMD(dev,where), 0xCF8);
53	outb(value, 0xCFC + (where&3));
54	return PCIBIOS_SUCCESSFUL;
55}
56
57static int pci_conf1_write_config_word(struct pci_dev *dev, int where, u16 value)
58{
59	outl(CONFIG_CMD(dev,where), 0xCF8);
60	outw(value, 0xCFC + (where&2));
61	return PCIBIOS_SUCCESSFUL;
62}
63
64static int pci_conf1_write_config_dword(struct pci_dev *dev, int where, u32 value)
65{
66	outl(CONFIG_CMD(dev,where), 0xCF8);
67	outl(value, 0xCFC);
68	return PCIBIOS_SUCCESSFUL;
69}
70
71#undef CONFIG_CMD
72
73static struct pci_ops visws_pci_ops = {
74	pci_conf1_read_config_byte,
75	pci_conf1_read_config_word,
76	pci_conf1_read_config_dword,
77	pci_conf1_write_config_byte,
78	pci_conf1_write_config_word,
79	pci_conf1_write_config_dword
80};
81
82static void __init pcibios_fixup_irqs(void)
83{
84	struct pci_dev *dev, *p;
85	u8 pin;
86	int irq;
87
88	pci_for_each_dev(dev) {
89		pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
90		dev->irq = 0;
91		if (!pin)
92			continue;
93		pin--;
94		if (dev->bus->parent) {
95			p = dev->bus->parent->self;
96			pin = (pin + PCI_SLOT(dev->devfn)) % 4;
97		} else
98			p = dev;
99		irq = visws_get_PCI_irq_vector(p->bus->number, PCI_SLOT(p->devfn), pin+1);
100		if (irq >= 0)
101			dev->irq = irq;
102		DBG("PCI IRQ: %s pin %d -> %d\n", dev->slot_name, pin, irq);
103	}
104}
105
106void __init pcibios_fixup_bus(struct pci_bus *b)
107{
108	pci_read_bridge_bases(b);
109}
110
111
112void __init pcibios_init(void)
113{
114	unsigned int sec_bus = li_pcib_read16(LI_PCI_BUSNUM) & 0xff;
115
116	printk("PCI: Probing PCI hardware on host buses 00 and %02x\n", sec_bus);
117	pci_scan_bus(0, &visws_pci_ops, NULL);
118	pci_scan_bus(sec_bus, &visws_pci_ops, NULL);
119	pcibios_fixup_irqs();
120	pcibios_resource_survey();
121}
122
123char * __init pcibios_setup(char *str)
124{
125	return str;
126}
127
128int pcibios_enable_device(struct pci_dev *dev, int mask)
129{
130	return pcibios_enable_resources(dev, mask);
131}
132
133void __init pcibios_penalize_isa_irq(irq)
134{
135}
136