1 #include <linux/kernel.h>
2 #include <linux/init.h>
4 #include <asm/bootinfo.h>
6 #include <asm/lasat/lasat.h>
7 #include <asm/gt64120.h>
10 #define PCI_ACCESS_READ 0
11 #define PCI_ACCESS_WRITE 1
13 #define LO(reg) (reg / 4)
14 #define HI(reg) (reg / 4 + 1)
16 volatile unsigned long *const vrc_pciregs = (void *) Vrc5074_BASE;
18 static spinlock_t nile4_pci_lock;
20 static int nile4_pcibios_config_access(unsigned char access_type,
21 struct pci_bus *bus, unsigned int devfn, int where, u32 * val)
23 unsigned char busnum = bus->number;
26 if ((busnum == 0) && (PCI_SLOT(devfn) > 8))
27 /* The addressing scheme chosen leaves room for just
28 * 8 devices on the first busnum (besides the PCI
29 * controller itself) */
30 return PCIBIOS_DEVICE_NOT_FOUND;
32 if ((busnum == 0) && (devfn == PCI_DEVFN(0, 0))) {
33 /* Access controller registers directly */
34 if (access_type == PCI_ACCESS_WRITE) {
35 vrc_pciregs[(0x200 + where) >> 2] = *val;
37 *val = vrc_pciregs[(0x200 + where) >> 2];
39 return PCIBIOS_SUCCESSFUL;
42 /* Temporarily map PCI Window 1 to config space */
43 mask = vrc_pciregs[LO(NILE4_PCIINIT1)];
44 vrc_pciregs[LO(NILE4_PCIINIT1)] = 0x0000001a | (busnum ? 0x200 : 0);
46 /* Clear PCI Error register. This also clears the Error Type
47 * bits in the Control register */
48 vrc_pciregs[LO(NILE4_PCIERR)] = 0;
49 vrc_pciregs[HI(NILE4_PCIERR)] = 0;
54 KSEG1ADDR(PCI_WINDOW1) +
55 ((1 << (PCI_SLOT(devfn) + 15)) | (PCI_FUNC(devfn) << 8)
58 adr = KSEG1ADDR(PCI_WINDOW1) | (busnum << 16) | (devfn << 8) |
61 if (access_type == PCI_ACCESS_WRITE)
66 /* Check for master or target abort */
67 err = (vrc_pciregs[HI(NILE4_PCICTRL)] >> 5) & 0x7;
69 /* Restore PCI Window 1 */
70 vrc_pciregs[LO(NILE4_PCIINIT1)] = mask;
73 return PCIBIOS_DEVICE_NOT_FOUND;
75 return PCIBIOS_SUCCESSFUL;
78 static int nile4_pcibios_read(struct pci_bus *bus, unsigned int devfn,
79 int where, int size, u32 * val)
85 if ((size == 2) && (where & 1))
86 return PCIBIOS_BAD_REGISTER_NUMBER;
87 else if ((size == 4) && (where & 3))
88 return PCIBIOS_BAD_REGISTER_NUMBER;
90 spin_lock_irqsave(&nile4_pci_lock, flags);
91 err = nile4_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
93 spin_unlock_irqrestore(&nile4_pci_lock, flags);
99 *val = (data >> ((where & 3) << 3)) & 0xff;
101 *val = (data >> ((where & 3) << 3)) & 0xffff;
105 return PCIBIOS_SUCCESSFUL;
108 static int nile4_pcibios_write(struct pci_bus *bus, unsigned int devfn,
109 int where, int size, u32 val)
115 if ((size == 2) && (where & 1))
116 return PCIBIOS_BAD_REGISTER_NUMBER;
117 else if ((size == 4) && (where & 3))
118 return PCIBIOS_BAD_REGISTER_NUMBER;
120 spin_lock_irqsave(&nile4_pci_lock, flags);
121 err = nile4_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
123 spin_unlock_irqrestore(&nile4_pci_lock, flags);
129 data = (data & ~(0xff << ((where & 3) << 3))) |
130 (val << ((where & 3) << 3));
132 data = (data & ~(0xffff << ((where & 3) << 3))) |
133 (val << ((where & 3) << 3));
137 if (nile4_pcibios_config_access
138 (PCI_ACCESS_WRITE, bus, devfn, where, &data))
141 return PCIBIOS_SUCCESSFUL;
144 struct pci_ops nile4_pci_ops = {
145 .read = nile4_pcibios_read,
146 .write = nile4_pcibios_write,