Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Low-Level PCI Support for PC | |
3 | * | |
4 | * (c) 1999--2000 Martin Mares <mj@ucw.cz> | |
5 | */ | |
6 | ||
7 | #include <linux/sched.h> | |
8 | #include <linux/pci.h> | |
9 | #include <linux/ioport.h> | |
10 | #include <linux/init.h> | |
8c4b2cf9 | 11 | #include <linux/dmi.h> |
1da177e4 LT |
12 | |
13 | #include <asm/acpi.h> | |
14 | #include <asm/segment.h> | |
15 | #include <asm/io.h> | |
16 | #include <asm/smp.h> | |
17 | ||
18 | #include "pci.h" | |
19 | ||
1da177e4 LT |
20 | unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 | |
21 | PCI_PROBE_MMCONF; | |
22 | ||
23 | int pci_routeirq; | |
24 | int pcibios_last_bus = -1; | |
120bb424 | 25 | unsigned long pirq_table_addr; |
26 | struct pci_bus *pci_root_bus; | |
1da177e4 LT |
27 | struct pci_raw_ops *raw_pci_ops; |
28 | ||
29 | static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value) | |
30 | { | |
31 | return raw_pci_ops->read(0, bus->number, devfn, where, size, value); | |
32 | } | |
33 | ||
34 | static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value) | |
35 | { | |
36 | return raw_pci_ops->write(0, bus->number, devfn, where, size, value); | |
37 | } | |
38 | ||
39 | struct pci_ops pci_root_ops = { | |
40 | .read = pci_read, | |
41 | .write = pci_write, | |
42 | }; | |
43 | ||
44 | /* | |
45 | * legacy, numa, and acpi all want to call pcibios_scan_root | |
46 | * from their initcalls. This flag prevents that. | |
47 | */ | |
48 | int pcibios_scanned; | |
49 | ||
50 | /* | |
51 | * This interrupt-safe spinlock protects all accesses to PCI | |
52 | * configuration space. | |
53 | */ | |
54 | DEFINE_SPINLOCK(pci_config_lock); | |
55 | ||
56 | /* | |
57 | * Several buggy motherboards address only 16 devices and mirror | |
58 | * them to next 16 IDs. We try to detect this `feature' on all | |
59 | * primary buses (those containing host bridges as they are | |
60 | * expected to be unique) and remove the ghost devices. | |
61 | */ | |
62 | ||
63 | static void __devinit pcibios_fixup_ghosts(struct pci_bus *b) | |
64 | { | |
65 | struct list_head *ln, *mn; | |
66 | struct pci_dev *d, *e; | |
67 | int mirror = PCI_DEVFN(16,0); | |
68 | int seen_host_bridge = 0; | |
69 | int i; | |
70 | ||
71 | DBG("PCI: Scanning for ghost devices on bus %d\n", b->number); | |
72 | list_for_each(ln, &b->devices) { | |
73 | d = pci_dev_b(ln); | |
74 | if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST) | |
75 | seen_host_bridge++; | |
76 | for (mn=ln->next; mn != &b->devices; mn=mn->next) { | |
77 | e = pci_dev_b(mn); | |
78 | if (e->devfn != d->devfn + mirror || | |
79 | e->vendor != d->vendor || | |
80 | e->device != d->device || | |
81 | e->class != d->class) | |
82 | continue; | |
83 | for(i=0; i<PCI_NUM_RESOURCES; i++) | |
84 | if (e->resource[i].start != d->resource[i].start || | |
85 | e->resource[i].end != d->resource[i].end || | |
86 | e->resource[i].flags != d->resource[i].flags) | |
87 | continue; | |
88 | break; | |
89 | } | |
90 | if (mn == &b->devices) | |
91 | return; | |
92 | } | |
93 | if (!seen_host_bridge) | |
94 | return; | |
95 | printk(KERN_WARNING "PCI: Ignoring ghost devices on bus %02x\n", b->number); | |
96 | ||
97 | ln = &b->devices; | |
98 | while (ln->next != &b->devices) { | |
99 | d = pci_dev_b(ln->next); | |
100 | if (d->devfn >= mirror) { | |
101 | list_del(&d->global_list); | |
102 | list_del(&d->bus_list); | |
103 | kfree(d); | |
104 | } else | |
105 | ln = ln->next; | |
106 | } | |
107 | } | |
108 | ||
109 | /* | |
110 | * Called after each bus is probed, but before its children | |
111 | * are examined. | |
112 | */ | |
113 | ||
114 | void __devinit pcibios_fixup_bus(struct pci_bus *b) | |
115 | { | |
116 | pcibios_fixup_ghosts(b); | |
117 | pci_read_bridge_bases(b); | |
118 | } | |
119 | ||
8c4b2cf9 BK |
120 | /* |
121 | * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus) | |
122 | */ | |
123 | #ifdef __i386__ | |
124 | static int __devinit assign_all_busses(struct dmi_system_id *d) | |
125 | { | |
126 | pci_probe |= PCI_ASSIGN_ALL_BUSSES; | |
127 | printk(KERN_INFO "%s detected: enabling PCI bus# renumbering" | |
128 | " (pci=assign-busses)\n", d->ident); | |
129 | return 0; | |
130 | } | |
131 | #endif | |
132 | ||
133 | /* | |
134 | * Laptops which need pci=assign-busses to see Cardbus cards | |
135 | */ | |
136 | static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = { | |
137 | #ifdef __i386__ | |
138 | { | |
139 | .callback = assign_all_busses, | |
140 | .ident = "Samsung X20 Laptop", | |
141 | .matches = { | |
142 | DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"), | |
143 | DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"), | |
144 | }, | |
145 | }, | |
146 | #endif /* __i386__ */ | |
147 | {} | |
148 | }; | |
1da177e4 LT |
149 | |
150 | struct pci_bus * __devinit pcibios_scan_root(int busnum) | |
151 | { | |
152 | struct pci_bus *bus = NULL; | |
153 | ||
8c4b2cf9 BK |
154 | dmi_check_system(pciprobe_dmi_table); |
155 | ||
1da177e4 LT |
156 | while ((bus = pci_find_next_bus(bus)) != NULL) { |
157 | if (bus->number == busnum) { | |
158 | /* Already scanned */ | |
159 | return bus; | |
160 | } | |
161 | } | |
162 |