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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
34static struct rio_table_hdr *rio_table_hdr __initdata;
35static struct scal_detail *scal_devs[MAX_NUMNODES] __initdata;
36static struct rio_detail *rio_devs[MAX_NUMNODES*4] __initdata;
37
38static 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
97static 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
131void __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}
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