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/summit/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 #ifndef CONFIG_X86_NUMAQ
  40 static int mp_bus_id_to_node[MAX_MP_BUSSES] __initdata;
  41 #endif
  42
  43 static int __init setup_pci_node_map_for_wpeg(int wpeg_num, int last_bus)
  44 {
  45         int twister = 0, node = 0;
  46         int i, bus, num_buses;
  47
  48         for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
  49                 if (rio_devs[i]->node_id == rio_devs[wpeg_num]->owner_id) {
  50                         twister = rio_devs[i]->owner_id;
  51                         break;
  52                 }
  53         }
  54         if (i == rio_table_hdr->num_rio_dev) {
  55                 printk(KERN_ERR "%s: Couldn't find owner Cyclone for Winnipeg!\n", __func__);
  56                 return last_bus;
  57         }
  58
  59         for (i = 0; i < rio_table_hdr->num_scal_dev; i++) {
  60                 if (scal_devs[i]->node_id == twister) {
  61                         node = scal_devs[i]->node_id;
  62                         break;
  63                 }
  64         }
  65         if (i == rio_table_hdr->num_scal_dev) {
  66                 printk(KERN_ERR "%s: Couldn't find owner Twister for Cyclone!\n", __func__);
  67                 return last_bus;
  68         }
  69
  70         switch (rio_devs[wpeg_num]->type) {
  71         case CompatWPEG:
  72                 /*
  73                  * The Compatibility Winnipeg controls the 2 legacy buses,
  74                  * the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
  75                  * a PCI-PCI bridge card is used in either slot: total 5 buses.
  76                  */
  77                 num_buses = 5;
  78                 break;
  79         case AltWPEG:
  80                 /*
  81                  * The Alternate Winnipeg controls the 2 133MHz buses [1 slot
  82                  * each], their 2 "extra" buses, the 100MHz bus [2 slots] and
  83                  * the "extra" buses for each of those slots: total 7 buses.
  84                  */
  85                 num_buses = 7;
  86                 break;
  87         case LookOutAWPEG:
  88         case LookOutBWPEG:
  89                 /*
  90                  * A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
  91                  * & the "extra" buses for each of those slots: total 9 buses.
  92                  */
  93                 num_buses = 9;
  94                 break;
  95         default:
  96                 printk(KERN_INFO "%s: Unsupported Winnipeg type!\n", __func__);
  97                 return last_bus;
  98         }
  99
 100         for (bus = last_bus; bus < last_bus + num_buses; bus++)
 101                 mp_bus_id_to_node[bus] = node;
 102         return bus;
 103 }
 104
 105 static int __init build_detail_arrays(void)
 106 {
 107         unsigned long ptr;
 108         int i, scal_detail_size, rio_detail_size;
 109
 110         if (rio_table_hdr->num_scal_dev > MAX_NUMNODES) {
 111                 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);
 112                 return 0;
 113         }
 114
 115         switch (rio_table_hdr->version) {
 116         default:
 117                 printk(KERN_WARNING "%s: Invalid Rio Grande Table Version: %d\n", __func__, rio_table_hdr->version);
 118                 return 0;
 119         case 2:
 120                 scal_detail_size = 11;
 121                 rio_detail_size = 13;
 122                 break;
 123         case 3:
 124                 scal_detail_size = 12;
 125                 rio_detail_size = 15;
 126                 break;
 127         }
 128
 129         ptr = (unsigned long)rio_table_hdr + 3;
 130         for (i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
 131                 scal_devs[i] = (struct scal_detail *)ptr;
 132
 133         for (i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
 134                 rio_devs[i] = (struct rio_detail *)ptr;
 135
 136         return 1;
 137 }
 138
 139 void __init setup_summit(void)
 140 {
 141         unsigned long           ptr;
 142         unsigned short          offset;
 143         int                     i, next_wpeg, next_bus = 0;
 144
 145         /* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
 146         ptr = get_bios_ebda();
 147         ptr = (unsigned long)phys_to_virt(ptr);
 148
 149         rio_table_hdr = NULL;
 150         offset = 0x180;
 151         while (offset) {
 152                 /* The block id is stored in the 2nd word */
 153                 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752) {
 154                         /* set the pointer past the offset & block id */
 155                         rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
 156                         break;
 157                 }
 158                 /* The next offset is stored in the 1st word.  0 means no more */
 159                 offset = *((unsigned short *)(ptr + offset));
 160         }
 161         if (!rio_table_hdr) {
 162                 printk(KERN_ERR "%s: Unable to locate Rio Grande Table in EBDA - bailing!\n", __func__);
 163                 return;
 164         }
 165
 166         if (!build_detail_arrays())
 167                 return;
 168
 169         /* The first Winnipeg we're looking for has an index of 0 */
 170         next_wpeg = 0;
 171         do {
 172                 for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
 173                         if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg) {
 174                                 /* It's the Winnipeg we're looking for! */
 175                                 next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
 176                                 next_wpeg++;
 177                                 break;
 178                         }
 179                 }
 180                 /*
 181                  * If we go through all Rio devices and don't find one with
 182                  * the next index, it means we've found all the Winnipegs,
 183                  * and thus all the PCI buses.
 184                  */
 185                 if (i == rio_table_hdr->num_rio_dev)
 186                         next_wpeg = 0;
 187         } while (next_wpeg != 0);
 188 }