pciehp_pci.c

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/*
 * PCI Express Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman ([email protected])
 * Copyright (C) 2001 IBM Corp.
 * Copyright (C) 2003-2004 Intel Corporation
 *
 * 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 <[email protected]>, <[email protected]>
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include "../pci.h"
#include "pciehp.h"

int pciehp_configure_device(struct slot *p_slot)
{
    struct pci_dev *dev;
    struct pci_dev *bridge = p_slot->ctrl->pcie->port;
    struct pci_bus *parent = bridge->subordinate;
    int num, fn;
    struct controller *ctrl = p_slot->ctrl;

    dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
    if (dev) {
        ctrl_err(ctrl, "Device %s already exists "
             "at %04x:%02x:00, cannot hot-add\n", pci_name(dev),
             pci_domain_nr(parent), parent->number);
        pci_dev_put(dev);
        return -EINVAL;
    }

    num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
    if (num == 0) {
        ctrl_err(ctrl, "No new device found\n");
        return -ENODEV;
    }

    for (fn = 0; fn < 8; fn++) {
        dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
        if (!dev)
            continue;
        if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
                (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
            pci_hp_add_bridge(dev);
        pci_dev_put(dev);
    }

    pci_assign_unassigned_bridge_resources(bridge);

    for (fn = 0; fn < 8; fn++) {
        dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
        if (!dev)
            continue;
        if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
            pci_dev_put(dev);
            continue;
        }
        pci_configure_slot(dev);
        pci_dev_put(dev);
    }

    pci_bus_add_devices(parent);

    return 0;
}

int pciehp_unconfigure_device(struct slot *p_slot)
{
    int ret, rc = 0;
    int j;
    u8 bctl = 0;
    u8 presence = 0;
    struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
    u16 command;
    struct controller *ctrl = p_slot->ctrl;

    ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
         __func__, pci_domain_nr(parent), parent->number);
    ret = pciehp_get_adapter_status(p_slot, &presence);
    if (ret)
        presence = 0;

    for (j = 0; j < 8; j++) {
        struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j));
        if (!temp)
            continue;
        if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
            pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
            if (bctl & PCI_BRIDGE_CTL_VGA) {
                ctrl_err(ctrl,
                     "Cannot remove display device %s\n",
                     pci_name(temp));
                pci_dev_put(temp);
                rc = -EINVAL;
                break;
            }
        }
        pci_stop_and_remove_bus_device(temp);
        /*
         * Ensure that no new Requests will be generated from
         * the device.
         */
        if (presence) {
            pci_read_config_word(temp, PCI_COMMAND, &command);
            command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
            command |= PCI_COMMAND_INTX_DISABLE;
            pci_write_config_word(temp, PCI_COMMAND, command);
        }
        pci_dev_put(temp);
    }

    return rc;
}