3 * BRIEF MODULE DESCRIPTION
4 * IT8172 system controller specific pci support.
6 * Copyright 2000 MontaVista Software Inc.
7 * Author: MontaVista Software, Inc.
8 * ppopov@mvista.com or source@mvista.com
10 * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
20 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * You should have received a copy of the GNU General Public License along
29 * with this program; if not, write to the Free Software Foundation, Inc.,
30 * 675 Mass Ave, Cambridge, MA 02139, USA.
32 #include <linux/types.h>
33 #include <linux/pci.h>
34 #include <linux/kernel.h>
35 #include <linux/init.h>
37 #include <asm/it8172/it8172.h>
38 #include <asm/it8172/it8172_pci.h>
40 #define PCI_ACCESS_READ 0
41 #define PCI_ACCESS_WRITE 1
45 #define DBG(x...) printk(x)
50 static struct resource pci_mem_resource_1;
52 static struct resource pci_io_resource = {
55 .name = "io pci IO space",
56 .flags = IORESOURCE_IO
59 static struct resource pci_mem_resource_0 = {
62 .name = "ext pci memory space 0/1",
63 .flags = IORESOURCE_MEM,
64 .parent = &pci_mem_resource_0,
66 .child = &pci_mem_resource_1
69 static struct resource pci_mem_resource_1 = {
72 .name = "ext pci memory space 2/3",
73 .flags = IORESOURCE_MEM,
74 .parent = &pci_mem_resource_0
77 extern struct pci_ops it8172_pci_ops;
79 struct pci_controller it8172_controller = {
80 .pci_ops = &it8172_pci_ops,
81 .io_resource = &pci_io_resource,
82 .mem_resource = &pci_mem_resource_0,
85 static int it8172_pcibios_config_access(unsigned char access_type,
87 unsigned int devfn, int where,
91 * config cycles are on 4 byte boundary only
95 IT_WRITE(IT_CONFADDR, (bus->number << IT_BUSNUM_SHF) |
96 (devfn << IT_FUNCNUM_SHF) | (where & ~0x3));
98 if (access_type == PCI_ACCESS_WRITE) {
99 IT_WRITE(IT_CONFDATA, *data);
101 IT_READ(IT_CONFDATA, *data);
105 * Revisit: check for master or target abort.
112 * We can't address 8 and 16 bit words directly. Instead we have to
113 * read/write a 32bit word and mask/modify the data we actually want.
115 static write_config(struct pci_bus *bus, unsigned int devfn, int where,
122 if (it8172_pcibios_config_access
123 (PCI_ACCESS_READ, dev, where, &data))
126 *val = (data >> ((where & 3) << 3)) & 0xff;
128 return PCIBIOS_SUCCESSFUL;
133 return PCIBIOS_BAD_REGISTER_NUMBER;
135 if (it8172_pcibios_config_access
136 (PCI_ACCESS_READ, dev, where, &data))
139 *val = (data >> ((where & 3) << 3)) & 0xffff;
140 DBG("cfg read word: bus %d dev_fn %x where %x: val %x\n",
141 dev->bus->number, dev->devfn, where, *val);
143 return PCIBIOS_SUCCESSFUL;
148 return PCIBIOS_BAD_REGISTER_NUMBER;
150 if (it8172_pcibios_config_access
151 (PCI_ACCESS_READ, dev, where, &data))
156 return PCIBIOS_SUCCESSFUL;
161 static write_config(struct pci_bus *bus, unsigned int devfn, int where,
168 if (it8172_pcibios_config_access
169 (PCI_ACCESS_READ, dev, where, &data))
172 data = (data & ~(0xff << ((where & 3) << 3))) |
173 (val << ((where & 3) << 3));
175 if (it8172_pcibios_config_access
176 (PCI_ACCESS_WRITE, dev, where, &data))
179 return PCIBIOS_SUCCESSFUL;
183 return PCIBIOS_BAD_REGISTER_NUMBER;
185 if (it8172_pcibios_config_access
186 (PCI_ACCESS_READ, dev, where, &data))
189 data = (data & ~(0xffff << ((where & 3) << 3))) |
190 (val << ((where & 3) << 3));
192 if (it8172_pcibios_config_access
193 (PCI_ACCESS_WRITE, dev, where, &data))
196 return PCIBIOS_SUCCESSFUL;
200 return PCIBIOS_BAD_REGISTER_NUMBER;
202 if (it8172_pcibios_config_access
203 (PCI_ACCESS_WRITE, dev, where, &val))
206 return PCIBIOS_SUCCESSFUL;
210 struct pci_ops it8172_pci_ops = {
212 .write = write_config,