arch/x86/kernel/summit_32.c

   1 /*
   2  * 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", __func__);
  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", __func__);
  62                 return last_bus;
  63         }
  64
  65         switch (rio_devs[wpeg_num]->type) {
  66         case CompatWPEG:
  67                 /*
  68                  * The Compatibility Winnipeg controls the 2 legacy buses,
  69                  * the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
  70                  * a PCI-PCI bridge card is used in either slot: total 5 buses.
  71                  */
  72                 num_buses = 5;
  73                 break;
  74         case AltWPEG:
  75                 /*
  76                  * The Alternate Winnipeg controls the 2 133MHz buses [1 slot
  77                  * each], their 2 "extra" buses, the 100MHz bus [2 slots] and
  78                  * the "extra" buses for each of those slots: total 7 buses.
  79                  */
  80                 num_buses = 7;
  81                 break;
  82         case LookOutAWPEG:
  83         case LookOutBWPEG:
  84                 /*
  85                  * A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
  86                  * & the "extra" buses for each of those slots: total 9 buses.
  87                  */
  88                 num_buses = 9;
  89                 break;
  90         default:
  91                 printk(KERN_INFO "%s: Unsupported Winnipeg type!\n", __func__);
  92                 return last_bus;
  93         }
  94
  95         for (bus = last_bus; bus < last_bus + num_buses; bus++)
  96                 mp_bus_id_to_node[bus] = node;
  97         return bus;
  98 }
  99
 100 static int __init build_detail_arrays(void)
 101 {
 102         unsigned long ptr;
 103         int i, scal_detail_size, rio_detail_size;
 104
 105         if (rio_table_hdr->num_scal_dev > MAX_NUMNODES) {
 106                 printk(KERN_WARNING "%s: MAX_NUMNODES too low!  Defined as %d, but system has %d nodes.\n", __func__, MAX_NUMNODES, rio_table_hdr->num_scal_dev);
 107                 return 0;
 108         }
 109
 110         switch (rio_table_hdr->version) {
 111         default:
 112                 printk(KERN_WARNING "%s: Invalid Rio Grande Table Version: %d\n", __func__, rio_table_hdr->version);
 113                 return 0;
 114         case 2:
 115                 scal_detail_size = 11;
 116                 rio_detail_size = 13;
 117                 break;
 118         case 3:
 119                 scal_detail_size = 12;
 120                 rio_detail_size = 15;
 121                 break;
 122         }
 123
 124         ptr = (unsigned long)rio_table_hdr + 3;
 125         for (i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
 126                 scal_devs[i] = (struct scal_detail *)ptr;
 127
 128         for (i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
 129                 rio_devs[i] = (struct rio_detail *)ptr;
 130
 131         return 1;
 132 }
 133
 134 void __init setup_summit(void)
 135 {
 136         unsigned long           ptr;
 137         unsigned short          offset;
 138         int                     i, next_wpeg, next_bus = 0;
 139
 140         /* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
 141         ptr = *(unsigned short *)phys_to_virt(0x40Eul);
 142         ptr = (unsigned long)phys_to_virt(ptr << 4);
 143
 144         rio_table_hdr = NULL;
 145         offset = 0x180;
 146         while (offset) {
 147                 /* The block id is stored in the 2nd word */
 148                 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752) {
 149                         /* set the pointer past the offset & block id */
 150                         rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
 151                         break;
 152                 }
 153                 /* The next offset is stored in the 1st word.  0 means no more */
 154                 offset = *((unsigned short *)(ptr + offset));
 155         }
 156         if (!rio_table_hdr) {
 157                 printk(KERN_ERR "%s: Unable to locate Rio Grande Table in EBDA - bailing!\n", __func__);
 158                 return;
 159         }
 160
 161         if (!build_detail_arrays())
 162                 return;
 163
 164         /* The first Winnipeg we're looking for has an index of 0 */
 165         next_wpeg = 0;
 166         do {
 167                 for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
 168                         if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg) {
 169                                 /* It's the Winnipeg we're looking for! */
 170                                 next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
 171                                 next_wpeg++;
 172                                 break;
 173                         }
 174                 }
 175                 /*
 176                  * If we go through all Rio devices and don't find one with
 177                  * the next index, it means we've found all the Winnipegs,
 178                  * and thus all the PCI buses.
 179                  */
 180                 if (i == rio_table_hdr->num_rio_dev)
 181                         next_wpeg = 0;
 182         } while (next_wpeg != 0);
 183 }