arch/mips/mips-boards/generic/pci.c

   1 /*
   2  * Copyright (C) 1999, 2000, 2004, 2005  MIPS Technologies, Inc.
   3  *      All rights reserved.
   4  *      Authors: Carsten Langgaard <carstenl@mips.com>
   5  *               Maciej W. Rozycki <macro@mips.com>
   6  *
   7  * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
   8  *
   9  *  This program is free software; you can distribute it and/or modify it
  10  *  under the terms of the GNU General Public License (Version 2) as
  11  *  published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope it will be useful, but WITHOUT
  14  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  *  for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  21  *
  22  * MIPS boards specific PCI support.
  23  */
  24 #include <linux/types.h>
  25 #include <linux/pci.h>
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28
  29 #include <asm/gt64120.h>
  30
  31 #include <asm/mips-boards/generic.h>
  32 #include <asm/mips-boards/bonito64.h>
  33 #include <asm/mips-boards/msc01_pci.h>
  34
  35 static struct resource bonito64_mem_resource = {
  36         .name   = "Bonito PCI MEM",
  37         .flags  = IORESOURCE_MEM,
  38 };
  39
  40 static struct resource bonito64_io_resource = {
  41         .name   = "Bonito PCI I/O",
  42         .start  = 0x00000000UL,
  43         .end    = 0x000fffffUL,
  44         .flags  = IORESOURCE_IO,
  45 };
  46
  47 static struct resource gt64120_mem_resource = {
  48         .name   = "GT-64120 PCI MEM",
  49         .flags  = IORESOURCE_MEM,
  50 };
  51
  52 static struct resource gt64120_io_resource = {
  53         .name   = "GT-64120 PCI I/O",
  54         .flags  = IORESOURCE_IO,
  55 };
  56
  57 static struct resource msc_mem_resource = {
  58         .name   = "MSC PCI MEM",
  59         .flags  = IORESOURCE_MEM,
  60 };
  61
  62 static struct resource msc_io_resource = {
  63         .name   = "MSC PCI I/O",
  64         .flags  = IORESOURCE_IO,
  65 };
  66
  67 extern struct pci_ops bonito64_pci_ops;
  68 extern struct pci_ops gt64xxx_pci0_ops;
  69 extern struct pci_ops msc_pci_ops;
  70
  71 static struct pci_controller bonito64_controller = {
  72         .pci_ops        = &bonito64_pci_ops,
  73         .io_resource    = &bonito64_io_resource,
  74         .mem_resource   = &bonito64_mem_resource,
  75         .io_offset      = 0x00000000UL,
  76 };
  77
  78 static struct pci_controller gt64120_controller = {
  79         .pci_ops        = &gt64xxx_pci0_ops,
  80         .io_resource    = &gt64120_io_resource,
  81         .mem_resource   = &gt64120_mem_resource,
  82 };
  83
  84 static struct pci_controller msc_controller = {
  85         .pci_ops        = &msc_pci_ops,
  86         .io_resource    = &msc_io_resource,
  87         .mem_resource   = &msc_mem_resource,
  88 };
  89
  90 void __init mips_pcibios_init(void)
  91 {
  92         struct pci_controller *controller;
  93         resource_size_t start, end, map, start1, end1, map1, map2, map3, mask;
  94
  95         switch (mips_revision_sconid) {
  96         case MIPS_REVISION_SCON_GT64120:
  97                 /*
  98                  * Due to a bug in the Galileo system controller, we need
  99                  * to setup the PCI BAR for the Galileo internal registers.
 100                  * This should be done in the bios/bootprom and will be
 101                  * fixed in a later revision of YAMON (the MIPS boards
 102                  * boot prom).
 103                  */
 104                 GT_WRITE(GT_PCI0_CFGADDR_OFS,
 105                          (0 << GT_PCI0_CFGADDR_BUSNUM_SHF) | /* Local bus */
 106                          (0 << GT_PCI0_CFGADDR_DEVNUM_SHF) | /* GT64120 dev */
 107                          (0 << GT_PCI0_CFGADDR_FUNCTNUM_SHF) | /* Function 0*/
 108                          ((0x20/4) << GT_PCI0_CFGADDR_REGNUM_SHF) | /* BAR 4*/
 109                          GT_PCI0_CFGADDR_CONFIGEN_BIT);
 110
 111                 /* Perform the write */
 112                 GT_WRITE(GT_PCI0_CFGDATA_OFS, CPHYSADDR(MIPS_GT_BASE));
 113
 114                 /* Set up resource ranges from the controller's registers.  */
 115                 start = GT_READ(GT_PCI0M0LD_OFS);
 116                 end = GT_READ(GT_PCI0M0HD_OFS);
 117                 map = GT_READ(GT_PCI0M0REMAP_OFS);
 118                 end = (end & GT_PCI_HD_MSK) | (start & ~GT_PCI_HD_MSK);
 119                 start1 = GT_READ(GT_PCI0M1LD_OFS);
 120                 end1 = GT_READ(GT_PCI0M1HD_OFS);
 121                 map1 = GT_READ(GT_PCI0M1REMAP_OFS);
 122                 end1 = (end1 & GT_PCI_HD_MSK) | (start1 & ~GT_PCI_HD_MSK);
 123                 /* Cannot support multiple windows, use the wider.  */
 124                 if (end1 - start1 > end - start) {
 125                         start = start1;
 126                         end = end1;
 127                         map = map1;
 128                 }
 129                 mask = ~(start ^ end);
 130                 /* We don't support remapping with a discontiguous mask.  */
 131                 BUG_ON((start & GT_PCI_HD_MSK) != (map & GT_PCI_HD_MSK) &&
 132                        mask != ~((mask & -mask) - 1));
 133                 gt64120_mem_resource.start = start;
 134                 gt64120_mem_resource.end = end;
 135                 gt64120_controller.mem_offset = (start & mask) - (map & mask);
 136                 /* Addresses are 36-bit, so do shifts in the destinations.  */
 137                 gt64120_mem_resource.start <<= GT_PCI_DCRM_SHF;
 138                 gt64120_mem_resource.end <<= GT_PCI_DCRM_SHF;
 139                 gt64120_mem_resource.end |= (1 << GT_PCI_DCRM_SHF) - 1;
 140                 gt64120_controller.mem_offset <<= GT_PCI_DCRM_SHF;
 141
 142                 start = GT_READ(GT_PCI0IOLD_OFS);
 143                 end = GT_READ(GT_PCI0IOHD_OFS);
 144                 map = GT_READ(GT_PCI0IOREMAP_OFS);
 145                 end = (end & GT_PCI_HD_MSK) | (start & ~GT_PCI_HD_MSK);
 146                 mask = ~(start ^ end);
 147                 /* We don't support remapping with a discontiguous mask.  */
 148                 BUG_ON((start & GT_PCI_HD_MSK) != (map & GT_PCI_HD_MSK) &&
 149                        mask != ~((mask & -mask) - 1));
 150                 gt64120_io_resource.start = map & mask;
 151                 gt64120_io_resource.end = (map & mask) | ~mask;
 152                 gt64120_controller.io_offset = 0;
 153                 /* Addresses are 36-bit, so do shifts in the destinations.  */
 154                 gt64120_io_resource.start <<= GT_PCI_DCRM_SHF;
 155                 gt64120_io_resource.end <<= GT_PCI_DCRM_SHF;
 156                 gt64120_io_resource.end |= (1 << GT_PCI_DCRM_SHF) - 1;
 157
 158                 controller = &gt64120_controller;
 159                 break;
 160
 161         case MIPS_REVISION_SCON_BONITO:
 162                 /* Set up resource ranges from the controller's registers.  */
 163                 map = BONITO_PCIMAP;
 164                 map1 = (BONITO_PCIMAP & BONITO_PCIMAP_PCIMAP_LO0) >>
 165                        BONITO_PCIMAP_PCIMAP_LO0_SHIFT;
 166                 map2 = (BONITO_PCIMAP & BONITO_PCIMAP_PCIMAP_LO1) >>
 167                        BONITO_PCIMAP_PCIMAP_LO1_SHIFT;
 168                 map3 = (BONITO_PCIMAP & BONITO_PCIMAP_PCIMAP_LO2) >>
 169                        BONITO_PCIMAP_PCIMAP_LO2_SHIFT;
 170                 /* Combine as many adjacent windows as possible.  */
 171                 map = map1;
 172                 start = BONITO_PCILO0_BASE;
 173                 end = 1;
 174                 if (map3 == map2 + 1) {
 175                         map = map2;
 176                         start = BONITO_PCILO1_BASE;
 177                         end++;
 178                 }
 179                 if (map2 == map1 + 1) {
 180                         map = map1;
 181                         start = BONITO_PCILO0_BASE;
 182                         end++;
 183                 }
 184                 bonito64_mem_resource.start = start;
 185                 bonito64_mem_resource.end = start +
 186                                             BONITO_PCIMAP_WINBASE(end) - 1;
 187                 bonito64_controller.mem_offset = start -
 188                                                  BONITO_PCIMAP_WINBASE(map);
 189
 190                 controller = &bonito64_controller;
 191                 break;
 192
 193         case MIPS_REVISION_SCON_SOCIT:
 194         case MIPS_REVISION_SCON_ROCIT:
 195         case MIPS_REVISION_SCON_SOCITSC:
 196         case MIPS_REVISION_SCON_SOCITSCP:
 197                 /* Set up resource ranges from the controller's registers.  */
 198                 MSC_READ(MSC01_PCI_SC2PMBASL, start);
 199                 MSC_READ(MSC01_PCI_SC2PMMSKL, mask);
 200                 MSC_READ(MSC01_PCI_SC2PMMAPL, map);
 201                 msc_mem_resource.start = start & mask;
 202                 msc_mem_resource.end = (start & mask) | ~mask;
 203                 msc_controller.mem_offset = (start & mask) - (map & mask);
 204
 205                 MSC_READ(MSC01_PCI_SC2PIOBASL, start);
 206                 MSC_READ(MSC01_PCI_SC2PIOMSKL, mask);
 207                 MSC_READ(MSC01_PCI_SC2PIOMAPL, map);
 208                 msc_io_resource.start = map & mask;
 209                 msc_io_resource.end = (map & mask) | ~mask;
 210                 msc_controller.io_offset = 0;
 211                 ioport_resource.end = ~mask;
 212
 213                 /* If ranges overlap I/O takes precedence.  */
 214                 start = start & mask;
 215                 end = start | ~mask;
 216                 if ((start >= msc_mem_resource.start &&
 217                      start <= msc_mem_resource.end) ||
 218                     (end >= msc_mem_resource.start &&
 219                      end <= msc_mem_resource.end)) {
 220                         /* Use the larger space.  */
 221                         start = max(start, msc_mem_resource.start);
 222                         end = min(end, msc_mem_resource.end);
 223                         if (start - msc_mem_resource.start >=
 224                             msc_mem_resource.end - end)
 225                                 msc_mem_resource.end = start - 1;
 226                         else
 227                                 msc_mem_resource.start = end + 1;
 228                 }
 229
 230                 controller = &msc_controller;
 231                 break;
 232         default:
 233                 return;
 234         }
 235
 236         if (controller->io_resource->start < 0x00001000UL)      /* FIXME */
 237                 controller->io_resource->start = 0x00001000UL;
 238
 239         iomem_resource.end &= 0xfffffffffULL;                   /* 64 GB */
 240         ioport_resource.end = controller->io_resource->end;
 241
 242         register_pci_controller (controller);
 243 }