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ops-titan.c

/*
 * Copyright 2003 PMC-Sierra
 * Author: Manish Lachwani (lachwani@pmc-sierra.com)
 *
 *  This program is free software; you can redistribute      it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the      License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED       ``AS      IS'' AND   ANY    EXPRESS OR IMPLIED
 *  WARRANTIES,     INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO      EVENT  SHALL   THE AUTHOR  BE  LIABLE FOR ANY     DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED     TO, PROCUREMENT OF  SUBSTITUTE GOODS    OR SERVICES; LOSS OF
 *  USE, DATA,    OR PROFITS; OR    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN    CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>

#include <asm/pci.h>
#include <asm/io.h>
#include <asm/rm9k-ocd.h>

/*
 * PCI specific defines
 */
#define     TITAN_PCI_0_CONFIG_ADDRESS    0x780
#define     TITAN_PCI_0_CONFIG_DATA       0x784

/*
 * Titan PCI Config Read Byte
 */
static int titan_read_config(struct pci_bus *bus, unsigned int devfn, int reg,
      int size, u32 * val)
{
      uint32_t address, tmp;
      int dev, busno, func;

      busno = bus->number;
      dev = PCI_SLOT(devfn);
      func = PCI_FUNC(devfn);

      address = (busno << 16) | (dev << 11) | (func << 8) |
                (reg & 0xfc) | 0x80000000;


      /* start the configuration cycle */
      ocd_writel(address, TITAN_PCI_0_CONFIG_ADDRESS);
      tmp = ocd_readl(TITAN_PCI_0_CONFIG_DATA) >> ((reg & 3) << 3);

      switch (size) {
      case 1:
            tmp &= 0xff;
      case 2:
            tmp &= 0xffff;
      }
      *val = tmp;

      return PCIBIOS_SUCCESSFUL;
}

static int titan_write_config(struct pci_bus *bus, unsigned int devfn, int reg,
      int size, u32 val)
{
      uint32_t address;
      int dev, busno, func;

      busno = bus->number;
      dev = PCI_SLOT(devfn);
      func = PCI_FUNC(devfn);

      address = (busno << 16) | (dev << 11) | (func << 8) |
            (reg & 0xfc) | 0x80000000;

      /* start the configuration cycle */
      ocd_writel(address, TITAN_PCI_0_CONFIG_ADDRESS);

      /* write the data */
      switch (size) {
      case 1:
            ocd_writeb(val, TITAN_PCI_0_CONFIG_DATA + (~reg & 0x3));
            break;

      case 2:
            ocd_writew(val, TITAN_PCI_0_CONFIG_DATA + (~reg & 0x2));
            break;

      case 4:
            ocd_writel(val, TITAN_PCI_0_CONFIG_DATA);
            break;
      }

      return PCIBIOS_SUCCESSFUL;
}

/*
 * Titan PCI structure
 */
struct pci_ops titan_pci_ops = {
      titan_read_config,
      titan_write_config,
};

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