Revert "PCI: use ACPI _CRS data by default"
[linux-2.6] / arch / x86 / pci / numaq_32.c
1 /*
2  * numaq_32.c - Low-level PCI access for NUMA-Q machines
3  */
4
5 #include <linux/pci.h>
6 #include <linux/init.h>
7 #include <linux/nodemask.h>
8 #include <asm/apic.h>
9 #include <asm/mpspec.h>
10 #include <asm/pci_x86.h>
11
12 #define XQUAD_PORTIO_BASE 0xfe400000
13 #define XQUAD_PORTIO_QUAD 0x40000  /* 256k per quad. */
14
15 #define BUS2QUAD(global) (mp_bus_id_to_node[global])
16
17 #define BUS2LOCAL(global) (mp_bus_id_to_local[global])
18
19 #define QUADLOCAL2BUS(quad,local) (quad_local_to_mp_bus_id[quad][local])
20
21 #define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)
22
23 #define PCI_CONF1_MQ_ADDRESS(bus, devfn, reg) \
24         (0x80000000 | (BUS2LOCAL(bus) << 16) | (devfn << 8) | (reg & ~3))
25
26 static void write_cf8(unsigned bus, unsigned devfn, unsigned reg)
27 {
28         unsigned val = PCI_CONF1_MQ_ADDRESS(bus, devfn, reg);
29         if (xquad_portio)
30                 writel(val, XQUAD_PORT_ADDR(0xcf8, BUS2QUAD(bus)));
31         else
32                 outl(val, 0xCF8);
33 }
34
35 static int pci_conf1_mq_read(unsigned int seg, unsigned int bus,
36                              unsigned int devfn, int reg, int len, u32 *value)
37 {
38         unsigned long flags;
39         void *adr __iomem = XQUAD_PORT_ADDR(0xcfc, BUS2QUAD(bus));
40
41         if (!value || (bus >= MAX_MP_BUSSES) || (devfn > 255) || (reg > 255))
42                 return -EINVAL;
43
44         spin_lock_irqsave(&pci_config_lock, flags);
45
46         write_cf8(bus, devfn, reg);
47
48         switch (len) {
49         case 1:
50                 if (xquad_portio)
51                         *value = readb(adr + (reg & 3));
52                 else
53                         *value = inb(0xCFC + (reg & 3));
54                 break;
55         case 2:
56                 if (xquad_portio)
57                         *value = readw(adr + (reg & 2));
58                 else
59                         *value = inw(0xCFC + (reg & 2));
60                 break;
61         case 4:
62                 if (xquad_portio)
63                         *value = readl(adr);
64                 else
65                         *value = inl(0xCFC);
66                 break;
67         }
68
69         spin_unlock_irqrestore(&pci_config_lock, flags);
70
71         return 0;
72 }
73
74 static int pci_conf1_mq_write(unsigned int seg, unsigned int bus,
75                               unsigned int devfn, int reg, int len, u32 value)
76 {
77         unsigned long flags;
78         void *adr __iomem = XQUAD_PORT_ADDR(0xcfc, BUS2QUAD(bus));
79
80         if ((bus >= MAX_MP_BUSSES) || (devfn > 255) || (reg > 255)) 
81                 return -EINVAL;
82
83         spin_lock_irqsave(&pci_config_lock, flags);
84
85         write_cf8(bus, devfn, reg);
86
87         switch (len) {
88         case 1:
89                 if (xquad_portio)
90                         writeb(value, adr + (reg & 3));
91                 else
92                         outb((u8)value, 0xCFC + (reg & 3));
93                 break;
94         case 2:
95                 if (xquad_portio)
96                         writew(value, adr + (reg & 2));
97                 else
98                         outw((u16)value, 0xCFC + (reg & 2));
99                 break;
100         case 4:
101                 if (xquad_portio)
102                         writel(value, adr + reg);
103                 else
104                         outl((u32)value, 0xCFC);
105                 break;
106         }
107
108         spin_unlock_irqrestore(&pci_config_lock, flags);
109
110         return 0;
111 }
112
113 #undef PCI_CONF1_MQ_ADDRESS
114
115 static struct pci_raw_ops pci_direct_conf1_mq = {
116         .read   = pci_conf1_mq_read,
117         .write  = pci_conf1_mq_write
118 };
119
120
121 static void __devinit pci_fixup_i450nx(struct pci_dev *d)
122 {
123         /*
124          * i450NX -- Find and scan all secondary buses on all PXB's.
125          */
126         int pxb, reg;
127         u8 busno, suba, subb;
128         int quad = BUS2QUAD(d->bus->number);
129
130         dev_info(&d->dev, "searching for i450NX host bridges\n");
131         reg = 0xd0;
132         for(pxb=0; pxb<2; pxb++) {
133                 pci_read_config_byte(d, reg++, &busno);
134                 pci_read_config_byte(d, reg++, &suba);
135                 pci_read_config_byte(d, reg++, &subb);
136                 dev_dbg(&d->dev, "i450NX PXB %d: %02x/%02x/%02x\n",
137                         pxb, busno, suba, subb);
138                 if (busno) {
139                         /* Bus A */
140                         pci_scan_bus_with_sysdata(QUADLOCAL2BUS(quad, busno));
141                 }
142                 if (suba < subb) {
143                         /* Bus B */
144                         pci_scan_bus_with_sysdata(QUADLOCAL2BUS(quad, suba+1));
145                 }
146         }
147         pcibios_last_bus = -1;
148 }
149 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82451NX, pci_fixup_i450nx);
150
151 int __init pci_numaq_init(void)
152 {
153         int quad;
154
155         if (!found_numaq)
156                 return 0;
157
158         raw_pci_ops = &pci_direct_conf1_mq;
159
160         if (pcibios_scanned++)
161                 return 0;
162
163         pci_root_bus = pcibios_scan_root(0);
164         if (pci_root_bus)
165                 pci_bus_add_devices(pci_root_bus);
166         if (num_online_nodes() > 1)
167                 for_each_online_node(quad) {
168                         if (quad == 0)
169                                 continue;
170                         printk("Scanning PCI bus %d for quad %d\n", 
171                                 QUADLOCAL2BUS(quad,0), quad);
172                         pci_scan_bus_with_sysdata(QUADLOCAL2BUS(quad, 0));
173                 }
174         return 0;
175 }