]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/i386/kernel/summit.c
2 * arch/i386/kernel/summit.c - IBM Summit-Specific Code
4 * Written By: Matthew Dobson, IBM Corporation
6 * Copyright (c) 2003 IBM Corp.
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.
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
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.
25 * Send feedback to <colpatch@us.ibm.com>
30 #include <linux/init.h>
32 #include <asm/mach-summit/mach_mpparse.h>
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
;
38 static int __init
setup_pci_node_map_for_wpeg ( int wpeg_num
, int last_bus
)
40 int twister
= 0 , node
= 0 ;
41 int i
, bus
, num_buses
;
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
;
49 if ( i
== rio_table_hdr
-> num_rio_dev
){
50 printk ( KERN_ERR
"%s: Couldn't find owner Cyclone for Winnipeg! \n " , __FUNCTION__
);
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
;
60 if ( i
== rio_table_hdr
-> num_scal_dev
){
61 printk ( KERN_ERR
"%s: Couldn't find owner Twister for Cyclone! \n " , __FUNCTION__
);
65 switch ( rio_devs
[ wpeg_num
]-> type
){
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.
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.
82 /* A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
83 * & the "extra" buses for each of those slots: total 9 buses.
88 printk ( KERN_INFO
"%s: Unsupported Winnipeg type! \n " , __FUNCTION__
);
92 for ( bus
= last_bus
; bus
< last_bus
+ num_buses
; bus
++)
93 mp_bus_id_to_node
[ bus
] = node
;
97 static int __init
build_detail_arrays ( void )
100 int i
, scal_detail_size
, rio_detail_size
;
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
);
107 switch ( rio_table_hdr
-> version
){
109 printk ( KERN_WARNING
"%s: Invalid Rio Grande Table Version: %d \n " , __FUNCTION__
, rio_table_hdr
-> version
);
112 scal_detail_size
= 11 ;
113 rio_detail_size
= 13 ;
116 scal_detail_size
= 12 ;
117 rio_detail_size
= 15 ;
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
;
125 for ( i
= 0 ; i
< rio_table_hdr
-> num_rio_dev
; i
++, ptr
+= rio_detail_size
)
126 rio_devs
[ i
] = ( struct rio_detail
*) ptr
;
131 void __init
setup_summit ( void )
134 unsigned short offset
;
135 int i
, next_wpeg
, next_bus
= 0 ;
137 /* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
138 ptr
= *( unsigned short *) phys_to_virt ( 0x40E ul
);
139 ptr
= ( unsigned long ) phys_to_virt ( ptr
<< 4 );
141 rio_table_hdr
= NULL
;
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 );
150 /* The next offset is stored in the 1st word. 0 means no more */
151 offset
= *(( unsigned short *)( ptr
+ offset
));
154 printk ( KERN_ERR
"%s: Unable to locate Rio Grande Table in EBDA - bailing! \n " , __FUNCTION__
);
158 if (! build_detail_arrays ())
161 /* The first Winnipeg we're looking for has an index of 0 */
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
);
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.
177 if ( i
== rio_table_hdr
-> num_rio_dev
)
179 } while ( next_wpeg
!= 0 );