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* arch/i386/kernel/summit.c - IBM Summit-Specific Code
*
* Written By: Matthew Dobson, IBM Corporation
*
* Copyright (c) 2003 IBM Corp.
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <colpatch@us.ibm.com>
*
*/
#include <linux/mm.h>
#include <linux/init.h>
#include <asm/io.h>
#include <mach_mpparse.h>
static void __init setup_pci_node_map_for_wpeg(int wpeg_num, struct rio_table_hdr *rth,
struct scal_detail **scal_nodes, struct rio_detail **rio_nodes){
int twst_num = 0, node = 0, first_bus = 0;
int i, bus, num_busses;
for(i = 0; i < rth->num_rio_dev; i++){
if (rio_nodes[i]->node_id == rio_nodes[wpeg_num]->owner_id){
twst_num = rio_nodes[i]->owner_id;
break;
}
}
if (i == rth->num_rio_dev){
printk("%s: Couldn't find owner Cyclone for Winnipeg!\n", __FUNCTION__);
return;
}
for(i = 0; i < rth->num_scal_dev; i++){
if (scal_nodes[i]->node_id == twst_num){
node = scal_nodes[i]->node_id;
break;
}
}
if (i == rth->num_scal_dev){
printk("%s: Couldn't find owner Twister for Cyclone!\n", __FUNCTION__);
return;
}
switch (rio_nodes[wpeg_num]->type){
case CompatWPEG:
/* The Compatability Winnipeg controls the legacy busses
(busses 0 & 1), the 66MHz PCI bus [2 slots] (bus 2),
and the "extra" busses in case a PCI-PCI bridge card is
used in either slot (busses 3 & 4): total 5 busses. */
num_busses = 5;
/* The BIOS numbers the busses starting at 1, and in a
slightly wierd manner. You'll have to trust that
the math used below to determine the number of the
first bus works. */
first_bus = (rio_nodes[wpeg_num]->first_slot - 1) * 2;
break;
case AltWPEG:
/* The Alternate/Secondary Winnipeg controls the 1st 133MHz
bus [1 slot] & its "extra" bus (busses 0 & 1), the 2nd
133MHz bus [1 slot] & its "extra" bus (busses 2 & 3), the
100MHz bus [2 slots] (bus 4), and the "extra" busses for
the 2 100MHz slots (busses 5 & 6): total 7 busses. */
num_busses = 7;
first_bus = (rio_nodes[wpeg_num]->first_slot * 2) - 1;
break;
case LookOutAWPEG:
case LookOutBWPEG:
printk("%s: LookOut Winnipegs not supported yet!\n", __FUNCTION__);
return;
default:
printk("%s: Unsupported Winnipeg type!\n", __FUNCTION__);
return;
}
for(bus = first_bus; bus < first_bus + num_busses; bus++)
mp_bus_id_to_node[bus] = node;
}
static void __init build_detail_arrays(struct rio_table_hdr *rth,
struct scal_detail **sd, struct rio_detail **rd){
unsigned long ptr;
int i, scal_detail_size, rio_detail_size;
switch (rth->version){
default:
printk("%s: Bad Rio Grande Table Version: %d\n", __FUNCTION__, rth->version);
/* Fall through to default to version 2 spec */
case 2:
scal_detail_size = 11;
rio_detail_size = 13;
break;
case 3:
scal_detail_size = 12;
rio_detail_size = 15;
break;
}
ptr = (unsigned long)rth + 3;
for(i = 0; i < rth->num_scal_dev; i++)
sd[i] = (struct scal_detail *)(ptr + (scal_detail_size * i));
ptr += scal_detail_size * rth->num_scal_dev;
for(i = 0; i < rth->num_rio_dev; i++)
rd[i] = (struct rio_detail *)(ptr + (rio_detail_size * i));
}
void __init setup_summit(void)
{
struct rio_table_hdr *rio_table_hdr = NULL;
struct scal_detail *scal_devs[MAX_NUMNODES];
struct rio_detail *rio_devs[MAX_NUMNODES*2];
unsigned long ptr;
unsigned short offset;
int i;
memset(mp_bus_id_to_node, -1, sizeof(mp_bus_id_to_node));
/* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
ptr = *(unsigned short *)phys_to_virt(0x40Eul);
ptr = (unsigned long)phys_to_virt(ptr << 4);
offset = 0x180;
while (offset){
/* The block id is stored in the 2nd word */
if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
/* set the pointer past the offset & block id */
rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
break;
}
/* The next offset is stored in the 1st word. 0 means no more */
offset = *((unsigned short *)(ptr + offset));
}
if (!rio_table_hdr){
printk("%s: Unable to locate Rio Grande Table in EBDA - bailing!\n", __FUNCTION__);
return;
}
/* Deal with the ugly version 2/3 pointer arithmetic */
build_detail_arrays(rio_table_hdr, scal_devs, rio_devs);
for(i = 0; i < rio_table_hdr->num_rio_dev; i++)
if (is_WPEG(rio_devs[i]->type))
/* It's a Winnipeg, it's got PCI Busses */
setup_pci_node_map_for_wpeg(i, rio_table_hdr, scal_devs, rio_devs);
}
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