Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Low-Level PCI Support for SGI Visual Workstation | |
3 | * | |
4 | * (c) 1999--2000 Martin Mares <mj@ucw.cz> | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/kernel.h> |
8 | #include <linux/pci.h> | |
9 | #include <linux/init.h> | |
10 | ||
5548ed11 | 11 | #include <asm/setup.h> |
82487711 | 12 | #include <asm/pci_x86.h> |
b4b86416 IM |
13 | #include <asm/visws/cobalt.h> |
14 | #include <asm/visws/lithium.h> | |
1da177e4 | 15 | |
1da177e4 | 16 | static int pci_visws_enable_irq(struct pci_dev *dev) { return 0; } |
46bdac99 | 17 | static void pci_visws_disable_irq(struct pci_dev *dev) { } |
1da177e4 | 18 | |
22d5c67c IM |
19 | /* int (*pcibios_enable_irq)(struct pci_dev *dev) = &pci_visws_enable_irq; */ |
20 | /* void (*pcibios_disable_irq)(struct pci_dev *dev) = &pci_visws_disable_irq; */ | |
1da177e4 | 21 | |
22d5c67c | 22 | /* void __init pcibios_penalize_isa_irq(int irq, int active) {} */ |
1da177e4 LT |
23 | |
24 | ||
25 | unsigned int pci_bus0, pci_bus1; | |
26 | ||
1da177e4 LT |
27 | static int __init visws_map_irq(struct pci_dev *dev, u8 slot, u8 pin) |
28 | { | |
29 | int irq, bus = dev->bus->number; | |
30 | ||
31 | pin--; | |
32 | ||
33 | /* Nothing useful at PIIX4 pin 1 */ | |
34 | if (bus == pci_bus0 && slot == 4 && pin == 0) | |
35 | return -1; | |
36 | ||
37 | /* PIIX4 USB is on Bus 0, Slot 4, Line 3 */ | |
38 | if (bus == pci_bus0 && slot == 4 && pin == 3) { | |
39 | irq = CO_IRQ(CO_APIC_PIIX4_USB); | |
40 | goto out; | |
41 | } | |
42 | ||
43 | /* First pin spread down 1 APIC entry per slot */ | |
44 | if (pin == 0) { | |
45 | irq = CO_IRQ((bus == pci_bus0 ? CO_APIC_PCIB_BASE0 : | |
46 | CO_APIC_PCIA_BASE0) + slot); | |
47 | goto out; | |
48 | } | |
49 | ||
50 | /* lines 1,2,3 from any slot is shared in this twirly pattern */ | |
51 | if (bus == pci_bus1) { | |
52 | /* lines 1-3 from devices 0 1 rotate over 2 apic entries */ | |
53 | irq = CO_IRQ(CO_APIC_PCIA_BASE123 + ((slot + (pin - 1)) % 2)); | |
54 | } else { /* bus == pci_bus0 */ | |
55 | /* lines 1-3 from devices 0-3 rotate over 3 apic entries */ | |
56 | if (slot == 0) | |
57 | slot = 3; /* same pattern */ | |
58 | irq = CO_IRQ(CO_APIC_PCIA_BASE123 + ((3 - slot) + (pin - 1) % 3)); | |
59 | } | |
60 | out: | |
61 | printk(KERN_DEBUG "PCI: Bus %d Slot %d Line %d -> IRQ %d\n", bus, slot, pin, irq); | |
62 | return irq; | |
63 | } | |
64 | ||
65 | void __init pcibios_update_irq(struct pci_dev *dev, int irq) | |
66 | { | |
67 | pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq); | |
68 | } | |
69 | ||
3cabf37f | 70 | int __init pci_visws_init(void) |
1da177e4 | 71 | { |
3cabf37f RR |
72 | pcibios_enable_irq = &pci_visws_enable_irq; |
73 | pcibios_disable_irq = &pci_visws_disable_irq; | |
74 | ||
1da177e4 LT |
75 | /* The VISWS supports configuration access type 1 only */ |
76 | pci_probe = (pci_probe | PCI_PROBE_CONF1) & | |
77 | ~(PCI_PROBE_BIOS | PCI_PROBE_CONF2); | |
78 | ||
79 | pci_bus0 = li_pcib_read16(LI_PCI_BUSNUM) & 0xff; | |
80 | pci_bus1 = li_pcia_read16(LI_PCI_BUSNUM) & 0xff; | |
81 | ||
82 | printk(KERN_INFO "PCI: Lithium bridge A bus: %u, " | |
83 | "bridge B (PIIX4) bus: %u\n", pci_bus1, pci_bus0); | |
84 | ||
85 | raw_pci_ops = &pci_direct_conf1; | |
73c59afc MBY |
86 | pci_scan_bus_with_sysdata(pci_bus0); |
87 | pci_scan_bus_with_sysdata(pci_bus1); | |
904d6a30 | 88 | pci_fixup_irqs(pci_common_swizzle, visws_map_irq); |
1da177e4 | 89 | pcibios_resource_survey(); |
b72d0db9 TG |
90 | /* Request bus scan */ |
91 | return 1; | |
1da177e4 | 92 | } |