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/bios_ebda.h>
  33 #include <asm/mach-summit/mach_mpparse.h>
  34
  35 static struct rio_table_hdr *rio_table_hdr __initdata;
  36 static struct scal_detail   *scal_devs[MAX_NUMNODES] __initdata;
  37 static struct rio_detail    *rio_devs[MAX_NUMNODES*4] __initdata;
  38
  39 static int mp_bus_id_to_node[MAX_MP_BUSSES] __initdata;
  40
  41 static int __init setup_pci_node_map_for_wpeg(int wpeg_num, int last_bus)
  42 {
  43         int twister = 0, node = 0;
  44         int i, bus, num_buses;
  45
  46         for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
  47                 if (rio_devs[i]->node_id == rio_devs[wpeg_num]->owner_id) {
  48                         twister = rio_devs[i]->owner_id;
  49                         break;
  50                 }
  51         }
  52         if (i == rio_table_hdr->num_rio_dev) {
  53                 printk(KERN_ERR "%s: Couldn't find owner Cyclone for Winnipeg!\n", __func__);
  54                 return last_bus;
  55         }
  56
  57         for (i = 0; i < rio_table_hdr->num_scal_dev; i++) {
  58                 if (scal_devs[i]->node_id == twister) {
  59                         node = scal_devs[i]->node_id;
  60                         break;
  61                 }
  62         }
  63         if (i == rio_table_hdr->num_scal_dev) {
  64                 printk(KERN_ERR "%s: Couldn't find owner Twister for Cyclone!\n", __func__);
  65                 return last_bus;
  66         }
  67
  68         switch (rio_devs[wpeg_num]->type) {
  69         case CompatWPEG:
  70                 /*
  71                  * The Compatibility Winnipeg controls the 2 legacy buses,
  72                  * the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
  73                  * a PCI-PCI bridge card is used in either slot: total 5 buses.
  74                  */
  75                 num_buses = 5;
  76                 break;
  77         case AltWPEG:
  78                 /*
  79                  * The Alternate Winnipeg controls the 2 133MHz buses [1 slot
  80                  * each], their 2 "extra" buses, the 100MHz bus [2 slots] and
  81                  * the "extra" buses for each of those slots: total 7 buses.
  82                  */
  83                 num_buses = 7;
  84                 break;
  85         case LookOutAWPEG:
  86         case LookOutBWPEG:
  87                 /*
  88                  * A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
  89                  * & the "extra" buses for each of those slots: total 9 buses.
  90                  */
  91                 num_buses = 9;
  92                 break;
  93         default:
  94                 printk(KERN_INFO "%s: Unsupported Winnipeg type!\n", __func__);
  95                 return last_bus;
  96         }
  97
  98         for (bus = last_bus; bus < last_bus + num_buses; bus++)
  99                 mp_bus_id_to_node[bus] = node;
 100         return bus;
 101 }
 102
 103 static int __init build_detail_arrays(void)
 104 {
 105         unsigned long ptr;
 106         int i, scal_detail_size, rio_detail_size;
 107
 108         if (rio_table_hdr->num_scal_dev > MAX_NUMNODES) {
 109                 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);
 110                 return 0;
 111         }
 112
 113         switch (rio_table_hdr->version) {
 114         default:
 115                 printk(KERN_WARNING "%s: Invalid Rio Grande Table Version: %d\n", __func__, rio_table_hdr->version);
 116                 return 0;
 117         case 2:
 118                 scal_detail_size = 11;
 119                 rio_detail_size = 13;
 120                 break;
 121         case 3:
 122                 scal_detail_size = 12;
 123                 rio_detail_size = 15;
 124                 break;
 125         }
 126
 127         ptr = (unsigned long)rio_table_hdr + 3;
 128         for (i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
 129                 scal_devs[i] = (struct scal_detail *)ptr;
 130
 131         for (i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
 132                 rio_devs[i] = (struct rio_detail *)ptr;
 133
 134         return 1;
 135 }
 136
 137 void __init setup_summit(void)
 138 {
 139         unsigned long           ptr;
 140         unsigned short          offset;
 141         int                     i, next_wpeg, next_bus = 0;
 142
 143         /* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
 144         ptr = get_bios_ebda();
 145         ptr = (unsigned long)phys_to_virt(ptr);
 146
 147         rio_table_hdr = NULL;
 148         offset = 0x180;
 149         while (offset) {
 150                 /* The block id is stored in the 2nd word */
 151                 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752) {
 152                         /* set the pointer past the offset & block id */
 153                         rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
 154                         break;
 155                 }
 156                 /* The next offset is stored in the 1st word.  0 means no more */
 157                 offset = *((unsigned short *)(ptr + offset));
 158         }
 159         if (!rio_table_hdr) {
 160                 printk(KERN_ERR "%s: Unable to locate Rio Grande Table in EBDA - bailing!\n", __func__);
 161                 return;
 162         }
 163
 164         if (!build_detail_arrays())
 165                 return;
 166
 167         /* The first Winnipeg we're looking for has an index of 0 */
 168         next_wpeg = 0;
 169         do {
 170                 for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
 171                         if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg) {
 172                                 /* It's the Winnipeg we're looking for! */
 173                                 next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
 174                                 next_wpeg++;
 175                                 break;
 176                         }
 177                 }
 178                 /*
 179                  * If we go through all Rio devices and don't find one with
 180                  * the next index, it means we've found all the Winnipegs,
 181                  * and thus all the PCI buses.
 182                  */
 183                 if (i == rio_table_hdr->num_rio_dev)
 184                         next_wpeg = 0;
 185         } while (next_wpeg != 0);
 186 }