Merge branch 'fix/hda' into for-linus
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / pci / early.c
1 #include <linux/kernel.h>
2 #include <linux/pci.h>
3 #include <asm/pci-direct.h>
4 #include <asm/io.h>
5 #include <asm/pci_x86.h>
6
7 /* Direct PCI access. This is used for PCI accesses in early boot before
8 the PCI subsystem works. */
9
10 u32 read_pci_config(u8 bus, u8 slot, u8 func, u8 offset)
11 {
12 u32 v;
13 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
14 v = inl(0xcfc);
15 if (v != 0xffffffff)
16 pr_debug("%x reading 4 from %x: %x\n", slot, offset, v);
17 return v;
18 }
19
20 u8 read_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset)
21 {
22 u8 v;
23 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
24 v = inb(0xcfc + (offset&3));
25 pr_debug("%x reading 1 from %x: %x\n", slot, offset, v);
26 return v;
27 }
28
29 u16 read_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset)
30 {
31 u16 v;
32 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
33 v = inw(0xcfc + (offset&2));
34 pr_debug("%x reading 2 from %x: %x\n", slot, offset, v);
35 return v;
36 }
37
38 void write_pci_config(u8 bus, u8 slot, u8 func, u8 offset,
39 u32 val)
40 {
41 pr_debug("%x writing to %x: %x\n", slot, offset, val);
42 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
43 outl(val, 0xcfc);
44 }
45
46 void write_pci_config_byte(u8 bus, u8 slot, u8 func, u8 offset, u8 val)
47 {
48 pr_debug("%x writing to %x: %x\n", slot, offset, val);
49 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
50 outb(val, 0xcfc + (offset&3));
51 }
52
53 void write_pci_config_16(u8 bus, u8 slot, u8 func, u8 offset, u16 val)
54 {
55 pr_debug("%x writing to %x: %x\n", slot, offset, val);
56 outl(0x80000000 | (bus<<16) | (slot<<11) | (func<<8) | offset, 0xcf8);
57 outw(val, 0xcfc + (offset&2));
58 }
59
60 int early_pci_allowed(void)
61 {
62 return (pci_probe & (PCI_PROBE_CONF1|PCI_PROBE_NOEARLY)) ==
63 PCI_PROBE_CONF1;
64 }
65
66 void early_dump_pci_device(u8 bus, u8 slot, u8 func)
67 {
68 int i;
69 int j;
70 u32 val;
71
72 printk(KERN_INFO "PCI: %02x:%02x:%02x", bus, slot, func);
73
74 for (i = 0; i < 256; i += 4) {
75 if (!(i & 0x0f))
76 printk("\n%04x:",i);
77
78 val = read_pci_config(bus, slot, func, i);
79 for (j = 0; j < 4; j++) {
80 printk(" %02x", val & 0xff);
81 val >>= 8;
82 }
83 }
84 printk("\n");
85 }
86
87 void early_dump_pci_devices(void)
88 {
89 unsigned bus, slot, func;
90
91 if (!early_pci_allowed())
92 return;
93
94 for (bus = 0; bus < 256; bus++) {
95 for (slot = 0; slot < 32; slot++) {
96 for (func = 0; func < 8; func++) {
97 u32 class;
98 u8 type;
99 class = read_pci_config(bus, slot, func,
100 PCI_CLASS_REVISION);
101 if (class == 0xffffffff)
102 break;
103
104 early_dump_pci_device(bus, slot, func);
105
106 /* No multi-function device? */
107 type = read_pci_config_byte(bus, slot, func,
108 PCI_HEADER_TYPE);
109 if (!(type & 0x80))
110 break;
111 }
112 }
113 }
114 }
115