135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/*
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* Standard Hot Plug Controller Driver
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*
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* Copyright (C) 1995,2001 Compaq Computer Corporation
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* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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* Copyright (C) 2003-2004 Intel Corporation
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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 <greg@kroah.com>, <kristen.c.accardi@intel.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include "../pci.h"
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#include "shpchp.h"
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int __ref shpchp_configure_device(struct slot *p_slot)
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{
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struct pci_dev *dev;
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struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
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int num, fn;
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struct controller *ctrl = p_slot->ctrl;
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dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
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if (dev) {
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ctrl_err(ctrl, "Device %s already exists "
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"at %04x:%02x:%02x, cannot hot-add\n", pci_name(dev),
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pci_domain_nr(parent), p_slot->bus, p_slot->device);
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pci_dev_put(dev);
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return -EINVAL;
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}
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num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
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if (num == 0) {
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ctrl_err(ctrl, "No new device found\n");
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return -ENODEV;
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}
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for (fn = 0; fn < 8; fn++) {
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dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
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if (!dev)
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continue;
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if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
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(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
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/* Find an unused bus number for the new bridge */
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struct pci_bus *child;
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unsigned char busnr, start = parent->busn_res.start;
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unsigned char end = parent->busn_res.end;
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int max;
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for (busnr = start; busnr <= end; busnr++) {
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if (!pci_find_bus(pci_domain_nr(parent),
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busnr))
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break;
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}
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if (busnr > end) {
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ctrl_err(ctrl,
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"No free bus for hot-added bridge\n");
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pci_dev_put(dev);
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continue;
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}
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child = pci_add_new_bus(parent, dev, busnr);
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if (!child) {
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ctrl_err(ctrl, "Cannot add new bus for %s\n",
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pci_name(dev));
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pci_dev_put(dev);
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continue;
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}
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max = pci_do_scan_bus(child);
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pci_bus_update_busn_res_end(child, max);
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pci_bus_size_bridges(child);
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}
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pci_configure_slot(dev);
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pci_dev_put(dev);
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}
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pci_bus_assign_resources(parent);
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pci_bus_add_devices(parent);
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pci_enable_bridges(parent);
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return 0;
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}
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int shpchp_unconfigure_device(struct slot *p_slot)
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{
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int rc = 0;
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int j;
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u8 bctl = 0;
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struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
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struct controller *ctrl = p_slot->ctrl;
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ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
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__func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
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for (j = 0; j < 8 ; j++) {
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struct pci_dev *temp = pci_get_slot(parent,
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(p_slot->device << 3) | j);
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if (!temp)
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continue;
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if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
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pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
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if (bctl & PCI_BRIDGE_CTL_VGA) {
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ctrl_err(ctrl,
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"Cannot remove display device %s\n",
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pci_name(temp));
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pci_dev_put(temp);
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rc = -EINVAL;
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break;
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}
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}
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pci_stop_and_remove_bus_device(temp);
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pci_dev_put(temp);
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}
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return rc;
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}
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