| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2003 PMC-Sierra |
| 3 | * Author: Manish Lachwani (lachwani@pmc-sierra.com) |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License as published by the |
| 7 | * Free Software Foundation; either version 2 of the License, or (at your |
| 8 | * option) any later version. |
| 9 | * |
| 10 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 11 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 12 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN |
| 13 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 14 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 15 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| 16 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| 17 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 18 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 19 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License along |
| 22 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 23 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | */ |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/pci.h> |
| 27 | #include <linux/kernel.h> |
| 28 | |
| 29 | #include <asm/titan_dep.h> |
| 30 | |
| 31 | static int titan_read_config(struct pci_bus *bus, unsigned int devfn, int reg, |
| 32 | int size, u32 * val) |
| 33 | { |
| 34 | uint32_t address, tmp; |
| 35 | int dev, busno, func; |
| 36 | |
| 37 | busno = bus->number; |
| 38 | dev = PCI_SLOT(devfn); |
| 39 | func = PCI_FUNC(devfn); |
| 40 | |
| 41 | address = (busno << 16) | (dev << 11) | (func << 8) | |
| 42 | (reg & 0xfc) | 0x80000000; |
| 43 | |
| 44 | |
| 45 | /* start the configuration cycle */ |
| 46 | TITAN_WRITE(TITAN_PCI_0_CONFIG_ADDRESS, address); |
| 47 | tmp = TITAN_READ(TITAN_PCI_0_CONFIG_DATA) >> ((reg & 3) << 3); |
| 48 | |
| 49 | switch (size) { |
| 50 | case 1: |
| 51 | tmp &= 0xff; |
| 52 | case 2: |
| 53 | tmp &= 0xffff; |
| 54 | } |
| 55 | *val = tmp; |
| 56 | |
| 57 | return PCIBIOS_SUCCESSFUL; |
| 58 | } |
| 59 | |
| 60 | static int titan_write_config(struct pci_bus *bus, unsigned int devfn, int reg, |
| 61 | int size, u32 val) |
| 62 | { |
| 63 | uint32_t address; |
| 64 | int dev, busno, func; |
| 65 | |
| 66 | busno = bus->number; |
| 67 | dev = PCI_SLOT(devfn); |
| 68 | func = PCI_FUNC(devfn); |
| 69 | |
| 70 | address = (busno << 16) | (dev << 11) | (func << 8) | |
| 71 | (reg & 0xfc) | 0x80000000; |
| 72 | |
| 73 | /* start the configuration cycle */ |
| 74 | TITAN_WRITE(TITAN_PCI_0_CONFIG_ADDRESS, address); |
| 75 | |
| 76 | /* write the data */ |
| 77 | switch (size) { |
| 78 | case 1: |
| 79 | TITAN_WRITE_8(TITAN_PCI_0_CONFIG_DATA + (~reg & 0x3), val); |
| 80 | break; |
| 81 | |
| 82 | case 2: |
| 83 | TITAN_WRITE_16(TITAN_PCI_0_CONFIG_DATA + (~reg & 0x2), val); |
| 84 | break; |
| 85 | |
| 86 | case 4: |
| 87 | TITAN_WRITE(TITAN_PCI_0_CONFIG_DATA, val); |
| 88 | break; |
| 89 | } |
| 90 | |
| 91 | return PCIBIOS_SUCCESSFUL; |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * Titan PCI structure |
| 96 | */ |
| 97 | struct pci_ops titan_pci_ops = { |
| 98 | titan_read_config, |
| 99 | titan_write_config, |
| 100 | }; |