Logo Search packages:      
Sourcecode: linux version File versions  Download package

ops-bonito64.c

/*
 * Copyright (C) 1999, 2000, 2004  MIPS Technologies, Inc.
 *    All rights reserved.
 *    Authors: Carsten Langgaard <carstenl@mips.com>
 *           Maciej W. Rozycki <macro@mips.com>
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  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.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * MIPS boards specific PCI support.
 */
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <asm/mips-boards/bonito64.h>

#define PCI_ACCESS_READ  0
#define PCI_ACCESS_WRITE 1

#ifdef CONFIG_LEMOTE_FULONG
#define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(BONITO_PCICFG_BASE | (offset))
#define ID_SEL_BEGIN 11
#else
#define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset))
#define ID_SEL_BEGIN 10
#endif
#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)


static int bonito64_pcibios_config_access(unsigned char access_type,
                              struct pci_bus *bus,
                              unsigned int devfn, int where,
                              u32 * data)
{
      u32 busnum = bus->number;
      u32 addr, type;
      u32 dummy;
      void *addrp;
      int device = PCI_SLOT(devfn);
      int function = PCI_FUNC(devfn);
      int reg = where & ~3;

      if (busnum == 0) {
            /* Type 0 configuration for onboard PCI bus */
            if (device > MAX_DEV_NUM)
                  return -1;

            addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
            type = 0;
      } else {
            /* Type 1 configuration for offboard PCI bus */
            addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
            type = 0x10000;
      }

      /* Clear aborts */
      BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR;

      BONITO_PCIMAP_CFG = (addr >> 16) | type;

      /* Flush Bonito register block */
      dummy = BONITO_PCIMAP_CFG;
      mmiowb();

      addrp = CFG_SPACE_REG(addr & 0xffff);
      if (access_type == PCI_ACCESS_WRITE) {
            writel(cpu_to_le32(*data), addrp);
#ifndef CONFIG_LEMOTE_FULONG
            /* Wait till done */
            while (BONITO_PCIMSTAT & 0xF);
#endif
      } else {
            *data = le32_to_cpu(readl(addrp));
      }

      /* Detect Master/Target abort */
      if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
                       BONITO_PCICMD_MTABORT_CLR)) {
            /* Error occurred */

            /* Clear bits */
            BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
                          BONITO_PCICMD_MTABORT_CLR);

            return -1;
      }

      return 0;

}


/*
 * We can't address 8 and 16 bit words directly.  Instead we have to
 * read/write a 32bit word and mask/modify the data we actually want.
 */
static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
                       int where, int size, u32 * val)
{
      u32 data = 0;

      if ((size == 2) && (where & 1))
            return PCIBIOS_BAD_REGISTER_NUMBER;
      else if ((size == 4) && (where & 3))
            return PCIBIOS_BAD_REGISTER_NUMBER;

      if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
                               &data))
            return -1;

      if (size == 1)
            *val = (data >> ((where & 3) << 3)) & 0xff;
      else if (size == 2)
            *val = (data >> ((where & 3) << 3)) & 0xffff;
      else
            *val = data;

      return PCIBIOS_SUCCESSFUL;
}

static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
                        int where, int size, u32 val)
{
      u32 data = 0;

      if ((size == 2) && (where & 1))
            return PCIBIOS_BAD_REGISTER_NUMBER;
      else if ((size == 4) && (where & 3))
            return PCIBIOS_BAD_REGISTER_NUMBER;

      if (size == 4)
            data = val;
      else {
            if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
                                           where, &data))
                  return -1;

            if (size == 1)
                  data = (data & ~(0xff << ((where & 3) << 3))) |
                        (val << ((where & 3) << 3));
            else if (size == 2)
                  data = (data & ~(0xffff << ((where & 3) << 3))) |
                        (val << ((where & 3) << 3));
      }

      if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
                               &data))
            return -1;

      return PCIBIOS_SUCCESSFUL;
}

struct pci_ops bonito64_pci_ops = {
      .read = bonito64_pcibios_read,
      .write = bonito64_pcibios_write
};

Generated by  Doxygen 1.6.0   Back to index