arch/mips/pci/ops-vr41xx.c

   1 /*
   2  *  ops-vr41xx.c, PCI configuration routines for the PCIU of NEC VR4100 series.
   3  *
   4  *  Copyright (C) 2001-2003 MontaVista Software Inc.
   5  *    Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
   6  *  Copyright (C) 2004-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22 /*
  23  * Changes:
  24  *  MontaVista Software Inc. <yyuasa@mvista.com> or <source@mvista.com>
  25  *  - New creation, NEC VR4122 and VR4131 are supported.
  26  */
  27 #include <linux/pci.h>
  28 #include <linux/types.h>
  29
  30 #include <asm/io.h>
  31
  32 #define PCICONFDREG     (void __iomem *)KSEG1ADDR(0x0f000c14)
  33 #define PCICONFAREG     (void __iomem *)KSEG1ADDR(0x0f000c18)
  34
  35 static inline int set_pci_configuration_address(unsigned char number,
  36                                                 unsigned int devfn, int where)
  37 {
  38         if (number == 0) {
  39                 /*
  40                  * Type 0 configuration
  41                  */
  42                 if (PCI_SLOT(devfn) < 11 || where > 0xff)
  43                         return -EINVAL;
  44
  45                 writel((1U << PCI_SLOT(devfn)) | (PCI_FUNC(devfn) << 8) |
  46                        (where & 0xfc), PCICONFAREG);
  47         } else {
  48                 /*
  49                  * Type 1 configuration
  50                  */
  51                 if (where > 0xff)
  52                         return -EINVAL;
  53
  54                 writel(((uint32_t)number << 16) | ((devfn & 0xff) << 8) |
  55                        (where & 0xfc) | 1U, PCICONFAREG);
  56         }
  57
  58         return 0;
  59 }
  60
  61 static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
  62                            int size, uint32_t *val)
  63 {
  64         uint32_t data;
  65
  66         *val = 0xffffffffU;
  67         if (set_pci_configuration_address(bus->number, devfn, where) < 0)
  68                 return PCIBIOS_DEVICE_NOT_FOUND;
  69
  70         data = readl(PCICONFDREG);
  71
  72         switch (size) {
  73         case 1:
  74                 *val = (data >> ((where & 3) << 3)) & 0xffU;
  75                 break;
  76         case 2:
  77                 *val = (data >> ((where & 2) << 3)) & 0xffffU;
  78                 break;
  79         case 4:
  80                 *val = data;
  81                 break;
  82         default:
  83                 return PCIBIOS_FUNC_NOT_SUPPORTED;
  84         }
  85
  86         return PCIBIOS_SUCCESSFUL;
  87 }
  88
  89 static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
  90                             int size, uint32_t val)
  91 {
  92         uint32_t data;
  93         int shift;
  94
  95         if (set_pci_configuration_address(bus->number, devfn, where) < 0)
  96                 return PCIBIOS_DEVICE_NOT_FOUND;
  97
  98         data = readl(PCICONFDREG);
  99
 100         switch (size) {
 101         case 1:
 102                 shift = (where & 3) << 3;
 103                 data &= ~(0xffU << shift);
 104                 data |= ((val & 0xffU) << shift);
 105                 break;
 106         case 2:
 107                 shift = (where & 2) << 3;
 108                 data &= ~(0xffffU << shift);
 109                 data |= ((val & 0xffffU) << shift);
 110                 break;
 111         case 4:
 112                 data = val;
 113                 break;
 114         default:
 115                 return PCIBIOS_FUNC_NOT_SUPPORTED;
 116         }
 117
 118         writel(data, PCICONFDREG);
 119
 120         return PCIBIOS_SUCCESSFUL;
 121 }
 122
 123 struct pci_ops vr41xx_pci_ops = {
 124         .read   = pci_config_read,
 125         .write  = pci_config_write,
 126 };