| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1995, 1996, 1997, 2002 by Ralf Baechle |
| 7 | * Copyright (C) 2001, 2002, 2003 by Liam Davies (ldavies@agile.tv) |
| 8 | */ |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/pci.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/init.h> |
| 13 | |
| 14 | #include <asm/pci.h> |
| 15 | #include <asm/io.h> |
| 16 | #include <asm/gt64120.h> |
| 17 | |
| 18 | #include <asm/cobalt/cobalt.h> |
| 19 | |
| 20 | /* |
| 21 | * Accessing device 31 hangs the GT64120. Not sure if this will also hang |
| 22 | * the GT64111, let's be paranoid for now. |
| 23 | */ |
| 24 | static inline int pci_range_ck(struct pci_bus *bus, unsigned int devfn) |
| 25 | { |
| 26 | if (bus->number == 0 && devfn == PCI_DEVFN(31, 0)) |
| 27 | return -1; |
| 28 | |
| 29 | return 0; |
| 30 | } |
| 31 | |
| 32 | static int gt64111_pci_read_config(struct pci_bus *bus, unsigned int devfn, |
| 33 | int where, int size, u32 * val) |
| 34 | { |
| 35 | if (pci_range_ck(bus, devfn)) |
| 36 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 37 | |
| 38 | switch (size) { |
| 39 | case 4: |
| 40 | PCI_CFG_SET(devfn, where); |
| 41 | *val = GALILEO_INL(GT_PCI0_CFGDATA_OFS); |
| 42 | return PCIBIOS_SUCCESSFUL; |
| 43 | |
| 44 | case 2: |
| 45 | PCI_CFG_SET(devfn, (where & ~0x3)); |
| 46 | *val = GALILEO_INL(GT_PCI0_CFGDATA_OFS) |
| 47 | >> ((where & 3) * 8); |
| 48 | return PCIBIOS_SUCCESSFUL; |
| 49 | |
| 50 | case 1: |
| 51 | PCI_CFG_SET(devfn, (where & ~0x3)); |
| 52 | *val = GALILEO_INL(GT_PCI0_CFGDATA_OFS) |
| 53 | >> ((where & 3) * 8); |
| 54 | return PCIBIOS_SUCCESSFUL; |
| 55 | } |
| 56 | |
| 57 | return PCIBIOS_BAD_REGISTER_NUMBER; |
| 58 | } |
| 59 | |
| 60 | static int gt64111_pci_write_config(struct pci_bus *bus, unsigned int devfn, |
| 61 | int where, int size, u32 val) |
| 62 | { |
| 63 | u32 tmp; |
| 64 | |
| 65 | if (pci_range_ck(bus, devfn)) |
| 66 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 67 | |
| 68 | switch (size) { |
| 69 | case 4: |
| 70 | PCI_CFG_SET(devfn, where); |
| 71 | GALILEO_OUTL(val, GT_PCI0_CFGDATA_OFS); |
| 72 | |
| 73 | return PCIBIOS_SUCCESSFUL; |
| 74 | |
| 75 | case 2: |
| 76 | PCI_CFG_SET(devfn, (where & ~0x3)); |
| 77 | tmp = GALILEO_INL(GT_PCI0_CFGDATA_OFS); |
| 78 | tmp &= ~(0xffff << ((where & 0x3) * 8)); |
| 79 | tmp |= (val << ((where & 0x3) * 8)); |
| 80 | GALILEO_OUTL(tmp, GT_PCI0_CFGDATA_OFS); |
| 81 | |
| 82 | return PCIBIOS_SUCCESSFUL; |
| 83 | |
| 84 | case 1: |
| 85 | PCI_CFG_SET(devfn, (where & ~0x3)); |
| 86 | tmp = GALILEO_INL(GT_PCI0_CFGDATA_OFS); |
| 87 | tmp &= ~(0xff << ((where & 0x3) * 8)); |
| 88 | tmp |= (val << ((where & 0x3) * 8)); |
| 89 | GALILEO_OUTL(tmp, GT_PCI0_CFGDATA_OFS); |
| 90 | |
| 91 | return PCIBIOS_SUCCESSFUL; |
| 92 | } |
| 93 | |
| 94 | return PCIBIOS_BAD_REGISTER_NUMBER; |
| 95 | } |
| 96 | |
| 97 | struct pci_ops gt64111_pci_ops = { |
| 98 | .read = gt64111_pci_read_config, |
| 99 | .write = gt64111_pci_write_config, |
| 100 | }; |