arch/i386/kernel/summit.c

   1 /*
   2  * arch/i386/kernel/summit.c - IBM Summit-Specific Code
   3  *
   4  * Written By: Matthew Dobson, IBM Corporation
   5  *
   6  * Copyright (c) 2003 IBM Corp.
   7  *
   8  * All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or (at
  13  * your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  18  * NON INFRINGEMENT.  See the GNU General Public License for more
  19  * 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 Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Send feedback to <colpatch@us.ibm.com>
  26  *
  27  */
  28
  29 #include <linux/mm.h>
  30 #include <linux/init.h>
  31 #include <asm/io.h>
  32 #include <asm/mach-summit/mach_mpparse.h>
  33
  34 static struct rio_table_hdr *rio_table_hdr __initdata;
  35 static struct scal_detail   *scal_devs[MAX_NUMNODES] __initdata;
  36 static struct rio_detail    *rio_devs[MAX_NUMNODES*4] __initdata;
  37
  38 static int __init setup_pci_node_map_for_wpeg(int wpeg_num, int last_bus)
  39 {
  40         int twister = 0, node = 0;
  41         int i, bus, num_buses;
  42
  43         for(i = 0; i < rio_table_hdr->num_rio_dev; i++){
  44                 if (rio_devs[i]->node_id == rio_devs[wpeg_num]->owner_id){
  45                         twister = rio_devs[i]->owner_id;
  46                         break;
  47                 }
  48         }
  49         if (i == rio_table_hdr->num_rio_dev){
  50                 printk(KERN_ERR "%s: Couldn't find owner Cyclone for Winnipeg!\n", __FUNCTION__);
  51                 return last_bus;
  52         }
  53
  54         for(i = 0; i < rio_table_hdr->num_scal_dev; i++){
  55                 if (scal_devs[i]->node_id == twister){
  56                         node = scal_devs[i]->node_id;
  57                         break;
  58                 }
  59         }
  60         if (i == rio_table_hdr->num_scal_dev){
  61                 printk(KERN_ERR "%s: Couldn't find owner Twister for Cyclone!\n", __FUNCTION__);
  62                 return last_bus;
  63         }
  64
  65         switch (rio_devs[wpeg_num]->type){
  66         case CompatWPEG:
  67                 /* The Compatability Winnipeg controls the 2 legacy buses,
  68                  * the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
  69                  * a PCI-PCI bridge card is used in either slot: total 5 buses.
  70                  */
  71                 num_buses = 5;
  72                 break;
  73         case AltWPEG:
  74                 /* The Alternate Winnipeg controls the 2 133MHz buses [1 slot
  75                  * each], their 2 "extra" buses, the 100MHz bus [2 slots] and
  76                  * the "extra" buses for each of those slots: total 7 buses.
  77                  */
  78                 num_buses = 7;
  79                 break;
  80         case LookOutAWPEG:
  81         case LookOutBWPEG:
  82                 /* A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
  83                  * & the "extra" buses for each of those slots: total 9 buses.
  84                  */
  85                 num_buses = 9;
  86                 break;
  87         default:
  88                 printk(KERN_INFO "%s: Unsupported Winnipeg type!\n", __FUNCTION__);
  89                 return last_bus;
  90         }
  91
  92         for(bus = last_bus; bus < last_bus + num_buses; bus++)
  93                 mp_bus_id_to_node[bus] = node;
  94         return bus;
  95 }
  96
  97 static int __init build_detail_arrays(void)
  98 {
  99         unsigned long ptr;
 100         int i, scal_detail_size, rio_detail_size;
 101
 102         if (rio_table_hdr->num_scal_dev > MAX_NUMNODES){
 103                 printk(KERN_WARNING "%s: MAX_NUMNODES too low!  Defined as %d, but system has %d nodes.\n", __FUNCTION__, MAX_NUMNODES, rio_table_hdr->num_scal_dev);
 104                 return 0;
 105         }
 106
 107         switch (rio_table_hdr->version){
 108         default:
 109                 printk(KERN_WARNING "%s: Invalid Rio Grande Table Version: %d\n", __FUNCTION__, rio_table_hdr->version);
 110                 return 0;
 111         case 2:
 112                 scal_detail_size = 11;
 113                 rio_detail_size = 13;
 114                 break;
 115         case 3:
 116                 scal_detail_size = 12;
 117                 rio_detail_size = 15;
 118                 break;
 119         }
 120
 121         ptr = (unsigned long)rio_table_hdr + 3;
 122         for(i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
 123                 scal_devs[i] = (struct scal_detail *)ptr;
 124
 125         for(i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
 126                 rio_devs[i] = (struct rio_detail *)ptr;
 127
 128         return 1;
 129 }
 130
 131 void __init setup_summit(void)
 132 {
 133         unsigned long           ptr;
 134         unsigned short          offset;
 135         int                     i, next_wpeg, next_bus = 0;
 136
 137         /* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
 138         ptr = *(unsigned short *)phys_to_virt(0x40Eul);
 139         ptr = (unsigned long)phys_to_virt(ptr << 4);
 140
 141         rio_table_hdr = NULL;
 142         offset = 0x180;
 143         while (offset){
 144                 /* The block id is stored in the 2nd word */
 145                 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
 146                         /* set the pointer past the offset & block id */
 147                         rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
 148                         break;
 149                 }
 150                 /* The next offset is stored in the 1st word.  0 means no more */
 151                 offset = *((unsigned short *)(ptr + offset));
 152         }
 153         if (!rio_table_hdr){
 154                 printk(KERN_ERR "%s: Unable to locate Rio Grande Table in EBDA - bailing!\n", __FUNCTION__);
 155                 return;
 156         }
 157
 158         if (!build_detail_arrays())
 159                 return;
 160
 161         /* The first Winnipeg we're looking for has an index of 0 */
 162         next_wpeg = 0;
 163         do {
 164                 for(i = 0; i < rio_table_hdr->num_rio_dev; i++){
 165                         if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg){
 166                                 /* It's the Winnipeg we're looking for! */
 167                                 next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
 168                                 next_wpeg++;
 169                                 break;
 170                         }
 171                 }
 172                 /*
 173                  * If we go through all Rio devices and don't find one with
 174                  * the next index, it means we've found all the Winnipegs,
 175                  * and thus all the PCI buses.
 176                  */
 177                 if (i == rio_table_hdr->num_rio_dev)
 178                         next_wpeg = 0;
 179         } while (next_wpeg != 0);
 180 }