target/linux/adm5120-2.6/files/arch/mips/pci/ops-adm5120.c

   1 /*
   2  *  $Id$
   3  *
   4  *  ADM5120 specific PCI operations
   5  *
   6  *  Copyright (C) ADMtek Incorporated.
   7  *  Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
   8  *  Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
   9  *  Copyright (C) 2007 OpenWrt.org
  10  *
  11  *  This program is free software; you can redistribute it and/or
  12  *  modify it under the terms of the GNU General Public License
  13  *  as published by the Free Software Foundation; either version 2
  14  *  of the License, or (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, write to the
  23  *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24  *  Boston, MA  02110-1301, USA.
  25  *
  26  */
  27
  28 #include <linux/types.h>
  29 #include <linux/pci.h>
  30 #include <linux/kernel.h>
  31 #include <linux/init.h>
  32
  33 #include <asm/mach-adm5120/adm5120_defs.h>
  34
  35 volatile u32* pci_config_address_reg = (volatile u32*)KSEG1ADDR(ADM5120_PCICFG_ADDR);
  36 volatile u32* pci_config_data_reg = (volatile u32*)KSEG1ADDR(ADM5120_PCICFG_DATA);
  37
  38 #define PCI_ENABLE 0x80000000
  39
  40 static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
  41                            int size, uint32_t *val)
  42 {
  43         *pci_config_address_reg = ((bus->number & 0xff) << 0x10) |
  44             ((devfn & 0xff) << 0x08) | (where & 0xfc) | PCI_ENABLE;
  45         switch (size) {
  46         case 1:
  47                 *val = ((*pci_config_data_reg)>>((where&3)<<3))&0xff;
  48                 break;
  49         case 2:
  50                 *val = ((*pci_config_data_reg)>>((where&3)<<3))&0xffff;
  51                 break;
  52         default:
  53                 *val = (*pci_config_data_reg);
  54                 break;
  55         }
  56         return PCIBIOS_SUCCESSFUL;
  57 }
  58
  59 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
  60                             int size, uint32_t val)
  61 {
  62         *pci_config_address_reg = ((bus->number & 0xff) << 0x10) |
  63             ((devfn & 0xff) << 0x08) | (where & 0xfc) | PCI_ENABLE;
  64         switch (size) {
  65         case 1:
  66                 *(volatile u8 *)(((int)pci_config_data_reg) +
  67                             (where & 3)) = val;
  68                 break;
  69         case 2:
  70                 *(volatile u16 *)(((int)pci_config_data_reg) +
  71                             (where & 2)) = (val);
  72                 break;
  73         default:
  74                 *pci_config_data_reg = (val);
  75         }
  76
  77         return PCIBIOS_SUCCESSFUL;
  78 }
  79
  80 struct pci_ops adm5120_pci_ops = {
  81         .read   = pci_config_read,
  82         .write  = pci_config_write,
  83 };