112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
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/*
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* Copyright 2003 PMC-Sierra
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* Author: Manish Lachwani (lachwani@pmc-sierra.com)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <asm/pci.h>
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#include <asm/io.h>
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#include <asm/rm9k-ocd.h>
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/*
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* PCI specific defines
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*/
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#define TITAN_PCI_0_CONFIG_ADDRESS 0x780
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#define TITAN_PCI_0_CONFIG_DATA 0x784
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/*
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* Titan PCI Config Read Byte
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*/
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static int titan_read_config(struct pci_bus *bus, unsigned int devfn, int reg,
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int size, u32 * val)
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{
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uint32_t address, tmp;
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int dev, busno, func;
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busno = bus->number;
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dev = PCI_SLOT(devfn);
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func = PCI_FUNC(devfn);
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address = (busno << 16) | (dev << 11) | (func << 8) |
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(reg & 0xfc) | 0x80000000;
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/* start the configuration cycle */
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ocd_writel(address, TITAN_PCI_0_CONFIG_ADDRESS);
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tmp = ocd_readl(TITAN_PCI_0_CONFIG_DATA) >> ((reg & 3) << 3);
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switch (size) {
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case 1:
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tmp &= 0xff;
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case 2:
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tmp &= 0xffff;
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}
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*val = tmp;
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return PCIBIOS_SUCCESSFUL;
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}
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static int titan_write_config(struct pci_bus *bus, unsigned int devfn, int reg,
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int size, u32 val)
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{
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uint32_t address;
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int dev, busno, func;
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busno = bus->number;
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dev = PCI_SLOT(devfn);
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func = PCI_FUNC(devfn);
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address = (busno << 16) | (dev << 11) | (func << 8) |
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(reg & 0xfc) | 0x80000000;
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/* start the configuration cycle */
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ocd_writel(address, TITAN_PCI_0_CONFIG_ADDRESS);
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/* write the data */
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switch (size) {
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case 1:
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ocd_writeb(val, TITAN_PCI_0_CONFIG_DATA + (~reg & 0x3));
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break;
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case 2:
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ocd_writew(val, TITAN_PCI_0_CONFIG_DATA + (~reg & 0x2));
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break;
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case 4:
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ocd_writel(val, TITAN_PCI_0_CONFIG_DATA);
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break;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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/*
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* Titan PCI structure
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*/
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struct pci_ops titan_pci_ops = {
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titan_read_config,
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titan_write_config,
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};
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