ibmphp_ebda.c

LINUX 2.6.17.4的源码

/*
 * IBM Hot Plug Controller Driver
 *
 * Written By: Tong Yu, IBM Corporation
 *
 * Copyright (C) 2001,2003 Greg Kroah-Hartman ([e-mail])
 * Copyright (C) 2001-2003 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 <[e-mail]>
 *
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/list.h>
#include <linux/init.h>
#include "ibmphp.h"

/*
 * POST builds data blocks(in this data block definition, a char-1
 * byte, short(or word)-2 byte, long(dword)-4 byte) in the Extended
 * BIOS Data Area which describe the configuration of the hot-plug
 * controllers and resources used by the PCI Hot-Plug devices.
 *
 * This file walks EBDA, maps data block from physical addr,
 * reconstruct linked lists about all system resource(MEM, PFM, IO)
 * already assigned by POST, as well as linked lists about hot plug
 * controllers (ctlr#, slot#, bus&slot features...)
 */

/* Global lists */
LIST_HEAD (ibmphp_ebda_pci_rsrc_head);
LIST_HEAD (ibmphp_slot_head);

/* Local variables */
static struct ebda_hpc_list *hpc_list_ptr;
static struct ebda_rsrc_list *rsrc_list_ptr;
static struct rio_table_hdr *rio_table_ptr = NULL;
static LIST_HEAD (ebda_hpc_head);
static LIST_HEAD (bus_info_head);
static LIST_HEAD (rio_vg_head);
static LIST_HEAD (rio_lo_head);
static LIST_HEAD (opt_vg_head);
static LIST_HEAD (opt_lo_head);
static void __iomem *io_mem;

/* Local functions */
static int ebda_rsrc_controller (void);
static int ebda_rsrc_rsrc (void);
static int ebda_rio_table (void);

static struct ebda_hpc_list * __init alloc_ebda_hpc_list (void)
{
	return kzalloc(sizeof(struct ebda_hpc_list), GFP_KERNEL);
}

static struct controller *alloc_ebda_hpc (u32 slot_count, u32 bus_count)
{
	struct controller *controller;
	struct ebda_hpc_slot *slots;
	struct ebda_hpc_bus *buses;

	controller = kzalloc(sizeof(struct controller), GFP_KERNEL);
	if (!controller)
		goto error;

	slots = kcalloc(slot_count, sizeof(struct ebda_hpc_slot), GFP_KERNEL);
	if (!slots)
		goto error_contr;
	controller->slots = slots;

	buses = kcalloc(bus_count, sizeof(struct ebda_hpc_bus), GFP_KERNEL);
	if (!buses)
		goto error_slots;
	controller->buses = buses;

	return controller;
error_slots:
	kfree(controller->slots);
error_contr:
	kfree(controller);
error:
	return NULL;
}

static void free_ebda_hpc (struct controller *controller)
{
	kfree (controller->slots);
	kfree (controller->buses);
	kfree (controller);
}

static struct ebda_rsrc_list * __init alloc_ebda_rsrc_list (void)
{
	return kzalloc(sizeof(struct ebda_rsrc_list), GFP_KERNEL);
}

static struct ebda_pci_rsrc *alloc_ebda_pci_rsrc (void)
{
	return kzalloc(sizeof(struct ebda_pci_rsrc), GFP_KERNEL);
}

static void __init print_bus_info (void)
{
	struct bus_info *ptr;
	struct list_head *ptr1;
	
	list_for_each (ptr1, &bus_info_head) {
		ptr = list_entry (ptr1, struct bus_info, bus_info_list);
		debug ("%s - slot_min = %x\n", __FUNCTION__, ptr->slot_min);
		debug ("%s - slot_max = %x\n", __FUNCTION__, ptr->slot_max);
		debug ("%s - slot_count = %x\n", __FUNCTION__, ptr->slot_count);
		debug ("%s - bus# = %x\n", __FUNCTION__, ptr->busno);
		debug ("%s - current_speed = %x\n", __FUNCTION__, ptr->current_speed);
		debug ("%s - controller_id = %x\n", __FUNCTION__, ptr->controller_id);
		
		debug ("%s - slots_at_33_conv = %x\n", __FUNCTION__, ptr->slots_at_33_conv);
		debug ("%s - slots_at_66_conv = %x\n", __FUNCTION__, ptr->slots_at_66_conv);
		debug ("%s - slots_at_66_pcix = %x\n", __FUNCTION__, ptr->slots_at_66_pcix);
		debug ("%s - slots_at_100_pcix = %x\n", __FUNCTION__, ptr->slots_at_100_pcix);
		debug ("%s - slots_at_133_pcix = %x\n", __FUNCTION__, ptr->slots_at_133_pcix);

	}
}

static void print_lo_info (void)
{
	struct rio_detail *ptr;
	struct list_head *ptr1;
	debug ("print_lo_info ----\n");	
	list_for_each (ptr1, &rio_lo_head) {
		ptr = list_entry (ptr1, struct rio_detail, rio_detail_list);
		debug ("%s - rio_node_id = %x\n", __FUNCTION__, ptr->rio_node_id);
		debug ("%s - rio_type = %x\n", __FUNCTION__, ptr->rio_type);
		debug ("%s - owner_id = %x\n", __FUNCTION__, ptr->owner_id);
		debug ("%s - first_slot_num = %x\n", __FUNCTION__, ptr->first_slot_num);
		debug ("%s - wpindex = %x\n", __FUNCTION__, ptr->wpindex);
		debug ("%s - chassis_num = %x\n", __FUNCTION__, ptr->chassis_num);

	}
}

static void print_vg_info (void)
{
	struct rio_detail *ptr;
	struct list_head *ptr1;
	debug ("%s ---\n", __FUNCTION__);
	list_for_each (ptr1, &rio_vg_head) {
		ptr = list_entry (ptr1, struct rio_detail, rio_detail_list);
		debug ("%s - rio_node_id = %x\n", __FUNCTION__, ptr->rio_node_id);
		debug ("%s - rio_type = %x\n", __FUNCTION__, ptr->rio_type);
		debug ("%s - owner_id = %x\n", __FUNCTION__, ptr->owner_id);
		debug ("%s - first_slot_num = %x\n", __FUNCTION__, ptr->first_slot_num);
		debug ("%s - wpindex = %x\n", __FUNCTION__, ptr->wpindex);
		debug ("%s - chassis_num = %x\n", __FUNCTION__, ptr->chassis_num);

	}
}

static void __init print_ebda_pci_rsrc (void)
{
	struct ebda_pci_rsrc *ptr;
	struct list_head *ptr1;

	list_for_each (ptr1, &ibmphp_ebda_pci_rsrc_head) {
		ptr = list_entry (ptr1, struct ebda_pci_rsrc, ebda_pci_rsrc_list);
		debug ("%s - rsrc type: %x bus#: %x dev_func: %x start addr: %x end addr: %x\n", 
			__FUNCTION__, ptr->rsrc_type ,ptr->bus_num, ptr->dev_fun,ptr->start_addr, ptr->end_addr);
	}
}

static void __init print_ibm_slot (void)
{
	struct slot *ptr;
	struct list_head *ptr1;

	list_for_each (ptr1, &ibmphp_slot_head) {
		ptr = list_entry (ptr1, struct slot, ibm_slot_list);
		debug ("%s - slot_number: %x\n", __FUNCTION__, ptr->number); 
	}
}

static void __init print_opt_vg (void)
{
	struct opt_rio *ptr;
	struct list_head *ptr1;
	debug ("%s ---\n", __FUNCTION__);
	list_for_each (ptr1, &opt_vg_head) {
		ptr = list_entry (ptr1, struct opt_rio, opt_rio_list);
		debug ("%s - rio_type %x\n", __FUNCTION__, ptr->rio_type); 
		debug ("%s - chassis_num: %x\n", __FUNCTION__, ptr->chassis_num); 
		debug ("%s - first_slot_num: %x\n", __FUNCTION__, ptr->first_slot_num); 
		debug ("%s - middle_num: %x\n", __FUNCTION__, ptr->middle_num); 
	}
}

static void __init print_ebda_hpc (void)
{
	struct controller *hpc_ptr;
	struct list_head *ptr1;
	u16 index;

	list_for_each (ptr1, &ebda_hpc_head) {

		hpc_ptr = list_entry (ptr1, struct controller, ebda_hpc_list); 

		for (index = 0; index < hpc_ptr->slot_count; index++) {
			debug ("%s - physical slot#: %x\n", __FUNCTION__, hpc_ptr->slots[index].slot_num);
			debug ("%s - pci bus# of the slot: %x\n", __FUNCTION__, hpc_ptr->slots[index].slot_bus_num);
			debug ("%s - index into ctlr addr: %x\n", __FUNCTION__, hpc_ptr->slots[index].ctl_index);
			debug ("%s - cap of the slot: %x\n", __FUNCTION__, hpc_ptr->slots[index].slot_cap);
		}

		for (index = 0; index < hpc_ptr->bus_count; index++) {
			debug ("%s - bus# of each bus controlled by this ctlr: %x\n", __FUNCTION__, hpc_ptr->buses[index].bus_num);
		}

		debug ("%s - type of hpc: %x\n", __FUNCTION__, hpc_ptr->ctlr_type);
		switch (hpc_ptr->ctlr_type) {
		case 1:
			debug ("%s - bus: %x\n", __FUNCTION__, hpc_ptr->u.pci_ctlr.bus);
			debug ("%s - dev_fun: %x\n", __FUNCTION__, hpc_ptr->u.pci_ctlr.dev_fun);
			debug ("%s - irq: %x\n", __FUNCTION__, hpc_ptr->irq);
			break;

		case 0:
			debug ("%s - io_start: %x\n", __FUNCTION__, hpc_ptr->u.isa_ctlr.io_start);
			debug ("%s - io_end: %x\n", __FUNCTION__, hpc_ptr->u.isa_ctlr.io_end);
			debug ("%s - irq: %x\n", __FUNCTION__, hpc_ptr->irq);
			break;

		case 2:
		case 4:
			debug ("%s - wpegbbar: %lx\n", __FUNCTION__, hpc_ptr->u.wpeg_ctlr.wpegbbar);
			debug ("%s - i2c_addr: %x\n", __FUNCTION__, hpc_ptr->u.wpeg_ctlr.i2c_addr);
			debug ("%s - irq: %x\n", __FUNCTION__, hpc_ptr->irq);
			break;
		}
	}
}

int __init ibmphp_access_ebda (void)
{
	u8 format, num_ctlrs, rio_complete, hs_complete;
	u16 ebda_seg, num_entries, next_offset, offset, blk_id, sub_addr, re, rc_id, re_id, base;
	int rc = 0;


	rio_complete = 0;
	hs_complete = 0;

	io_mem = ioremap ((0x40 << 4) + 0x0e, 2);
	if (!io_mem )
		return -ENOMEM;
	ebda_seg = readw (io_mem);
	iounmap (io_mem);
	debug ("returned ebda segment: %x\n", ebda_seg);
	
	io_mem = ioremap (ebda_seg<<4, 65000);
	if (!io_mem )
		return -ENOMEM;
	next_offset = 0x180;

	for (;;) {
		offset = next_offset;
		next_offset = readw (io_mem + offset);	/* offset of next blk */

		offset += 2;
		if (next_offset == 0)	/* 0 indicate it's last blk */
			break;
		blk_id = readw (io_mem + offset);	/* this blk id */

		offset += 2;
		/* check if it is hot swap block or rio block */
		if (blk_id != 0x4853 && blk_id != 0x4752)
			continue;
		/* found hs table */
		if (blk_id == 0x4853) {
			debug ("now enter hot swap block---\n");
			debug ("hot blk id: %x\n", blk_id);
			format = readb (io_mem + offset);

			offset += 1;
			if (format != 4)
				goto error_nodev;
			debug ("hot blk format: %x\n", format);
			/* hot swap sub blk */
			base = offset;

			sub_addr = base;
			re = readw (io_mem + sub_addr);	/* next sub blk */

			sub_addr += 2;
			rc_id = readw (io_mem + sub_addr); 	/* sub blk id */

			sub_addr += 2;
			if (rc_id != 0x5243)
				goto error_nodev;
			/* rc sub blk signature  */
			num_ctlrs = readb (io_mem + sub_addr);

			sub_addr += 1;
			hpc_list_ptr = alloc_ebda_hpc_list ();
			if (!hpc_list_ptr) {
				rc = -ENOMEM;
				goto out;
			}
			hpc_list_ptr->format = format;
			hpc_list_ptr->num_ctlrs = num_ctlrs;
			hpc_list_ptr->phys_addr = sub_addr;	/*  offset of RSRC_CONTROLLER blk */
			debug ("info about hpc descriptor---\n");
			debug ("hot blk format: %x\n", format);
			debug ("num of controller: %x\n", num_ctlrs);
			debug ("offset of hpc data structure enteries: %x\n ", sub_addr);

			sub_addr = base + re;	/* re sub blk */
			/* FIXME: rc is never used/checked */
			rc = readw (io_mem + sub_addr);	/* next sub blk */

			sub_addr += 2;
			re_id = readw (io_mem + sub_addr);	/* sub blk id */

			sub_addr += 2;
			if (re_id != 0x5245)
				goto error_nodev;

			/* signature of re */
			num_entries = readw (io_mem + sub_addr);

			sub_addr += 2;	/* offset of RSRC_ENTRIES blk */
			rsrc_list_ptr = alloc_ebda_rsrc_list ();
			if (!rsrc_list_ptr ) {
				rc = -ENOMEM;
				goto out;
			}
			rsrc_list_ptr->format = format;
			rsrc_list_ptr->num_entries = num_entries;
			rsrc_list_ptr->phys_addr = sub_addr;

			debug ("info about rsrc descriptor---\n");
			debug ("format: %x\n", format);
			debug ("num of rsrc: %x\n", num_entries);
			debug ("offset of rsrc data structure enteries: %x\n ", sub_addr);

			hs_complete = 1;
		} else {
		/* found rio table, blk_id == 0x4752 */
			debug ("now enter io table ---\n");
			debug ("rio blk id: %x\n", blk_id);

			rio_table_ptr = kzalloc(sizeof(struct rio_table_hdr), GFP_KERNEL);
			if (!rio_table_ptr)
				return -ENOMEM; 
			rio_table_ptr->ver_num = readb (io_mem + offset);
			rio_table_ptr->scal_count = readb (io_mem + offset + 1);
			rio_table_ptr->riodev_count = readb (io_mem + offset + 2);
			rio_table_ptr->offset = offset +3 ;
			
			debug("info about rio table hdr ---\n");
			debug("ver_num: %x\nscal_count: %x\nriodev_count: %x\noffset of rio table: %x\n ",
				rio_table_ptr->ver_num, rio_table_ptr->scal_count,
				rio_table_ptr->riodev_count, rio_table_ptr->offset);

			rio_complete = 1;
		}
	}

	if (!hs_complete && !rio_complete)
		goto error_nodev;

	if (rio_table_ptr) {
		if (rio_complete && rio_table_ptr->ver_num == 3) {
			rc = ebda_rio_table ();
			if (rc)
				goto out;
		}
	}
	rc = ebda_rsrc_controller ();
	if (rc)
		goto out;

	rc = ebda_rsrc_rsrc ();
	goto out;
error_nodev:
	rc = -ENODEV;
out:
	iounmap (io_mem);
	return rc;
}

/*
 * map info of scalability details and rio details from physical address
 */
static int __init ebda_rio_table (void)
{