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https://github.com/edk2-porting/linux-next.git
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9a163ed8e0
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
181 lines
5.2 KiB
C
181 lines
5.2 KiB
C
/*
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* arch/i386/kernel/summit.c - IBM Summit-Specific Code
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*
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* Written By: Matthew Dobson, IBM Corporation
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*
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* Copyright (c) 2003 IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <colpatch@us.ibm.com>
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*
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*/
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <asm/mach-summit/mach_mpparse.h>
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static struct rio_table_hdr *rio_table_hdr __initdata;
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static struct scal_detail *scal_devs[MAX_NUMNODES] __initdata;
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static struct rio_detail *rio_devs[MAX_NUMNODES*4] __initdata;
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static int __init setup_pci_node_map_for_wpeg(int wpeg_num, int last_bus)
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{
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int twister = 0, node = 0;
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int i, bus, num_buses;
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for(i = 0; i < rio_table_hdr->num_rio_dev; i++){
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if (rio_devs[i]->node_id == rio_devs[wpeg_num]->owner_id){
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twister = rio_devs[i]->owner_id;
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break;
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}
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}
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if (i == rio_table_hdr->num_rio_dev){
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printk(KERN_ERR "%s: Couldn't find owner Cyclone for Winnipeg!\n", __FUNCTION__);
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return last_bus;
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}
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for(i = 0; i < rio_table_hdr->num_scal_dev; i++){
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if (scal_devs[i]->node_id == twister){
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node = scal_devs[i]->node_id;
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break;
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}
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}
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if (i == rio_table_hdr->num_scal_dev){
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printk(KERN_ERR "%s: Couldn't find owner Twister for Cyclone!\n", __FUNCTION__);
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return last_bus;
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}
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switch (rio_devs[wpeg_num]->type){
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case CompatWPEG:
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/* The Compatability Winnipeg controls the 2 legacy buses,
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* the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
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* a PCI-PCI bridge card is used in either slot: total 5 buses.
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*/
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num_buses = 5;
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break;
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case AltWPEG:
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/* The Alternate Winnipeg controls the 2 133MHz buses [1 slot
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* each], their 2 "extra" buses, the 100MHz bus [2 slots] and
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* the "extra" buses for each of those slots: total 7 buses.
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*/
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num_buses = 7;
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break;
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case LookOutAWPEG:
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case LookOutBWPEG:
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/* A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
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* & the "extra" buses for each of those slots: total 9 buses.
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*/
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num_buses = 9;
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break;
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default:
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printk(KERN_INFO "%s: Unsupported Winnipeg type!\n", __FUNCTION__);
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return last_bus;
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}
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for(bus = last_bus; bus < last_bus + num_buses; bus++)
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mp_bus_id_to_node[bus] = node;
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return bus;
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}
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static int __init build_detail_arrays(void)
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{
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unsigned long ptr;
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int i, scal_detail_size, rio_detail_size;
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if (rio_table_hdr->num_scal_dev > MAX_NUMNODES){
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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);
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return 0;
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}
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switch (rio_table_hdr->version){
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default:
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printk(KERN_WARNING "%s: Invalid Rio Grande Table Version: %d\n", __FUNCTION__, rio_table_hdr->version);
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return 0;
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case 2:
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scal_detail_size = 11;
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rio_detail_size = 13;
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break;
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case 3:
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scal_detail_size = 12;
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rio_detail_size = 15;
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break;
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}
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ptr = (unsigned long)rio_table_hdr + 3;
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for(i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
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scal_devs[i] = (struct scal_detail *)ptr;
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for(i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
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rio_devs[i] = (struct rio_detail *)ptr;
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return 1;
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}
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void __init setup_summit(void)
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{
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unsigned long ptr;
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unsigned short offset;
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int i, next_wpeg, next_bus = 0;
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/* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
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ptr = *(unsigned short *)phys_to_virt(0x40Eul);
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ptr = (unsigned long)phys_to_virt(ptr << 4);
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rio_table_hdr = NULL;
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offset = 0x180;
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while (offset){
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/* The block id is stored in the 2nd word */
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if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
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/* set the pointer past the offset & block id */
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rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
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break;
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}
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/* The next offset is stored in the 1st word. 0 means no more */
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offset = *((unsigned short *)(ptr + offset));
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}
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if (!rio_table_hdr){
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printk(KERN_ERR "%s: Unable to locate Rio Grande Table in EBDA - bailing!\n", __FUNCTION__);
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return;
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}
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if (!build_detail_arrays())
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return;
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/* The first Winnipeg we're looking for has an index of 0 */
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next_wpeg = 0;
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do {
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for(i = 0; i < rio_table_hdr->num_rio_dev; i++){
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if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg){
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/* It's the Winnipeg we're looking for! */
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next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
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next_wpeg++;
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break;
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}
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}
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/*
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* If we go through all Rio devices and don't find one with
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* the next index, it means we've found all the Winnipegs,
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* and thus all the PCI buses.
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*/
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if (i == rio_table_hdr->num_rio_dev)
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next_wpeg = 0;
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} while (next_wpeg != 0);
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}
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