1/*
2 * Standard Hot Plug Controller Driver
3 *
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
8 *
9 * All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT.  See the GNU General Public License for more
20 * details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27 *
28 */
29
30#include <linux/module.h>
31#include <linux/kernel.h>
32#include <linux/types.h>
33#include <linux/pci.h>
34#include "../pci.h"
35#include "shpchp.h"
36
37int __ref shpchp_configure_device(struct slot *p_slot)
38{
39	struct pci_dev *dev;
40	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
41	int num, fn;
42	struct controller *ctrl = p_slot->ctrl;
43
44	dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
45	if (dev) {
46		ctrl_err(ctrl, "Device %s already exists "
47			 "at %04x:%02x:%02x, cannot hot-add\n", pci_name(dev),
48			 pci_domain_nr(parent), p_slot->bus, p_slot->device);
49		pci_dev_put(dev);
50		return -EINVAL;
51	}
52
53	num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
54	if (num == 0) {
55		ctrl_err(ctrl, "No new device found\n");
56		return -ENODEV;
57	}
58
59	for (fn = 0; fn < 8; fn++) {
60		dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
61		if (!dev)
62			continue;
63		if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
64				(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
65			/* Find an unused bus number for the new bridge */
66			struct pci_bus *child;
67			unsigned char busnr, start = parent->secondary;
68			unsigned char end = parent->subordinate;
69			for (busnr = start; busnr <= end; busnr++) {
70				if (!pci_find_bus(pci_domain_nr(parent),
71							busnr))
72					break;
73			}
74			if (busnr > end) {
75				ctrl_err(ctrl,
76					 "No free bus for hot-added bridge\n");
77				pci_dev_put(dev);
78				continue;
79			}
80			child = pci_add_new_bus(parent, dev, busnr);
81			if (!child) {
82				ctrl_err(ctrl, "Cannot add new bus for %s\n",
83					 pci_name(dev));
84				pci_dev_put(dev);
85				continue;
86			}
87			child->subordinate = pci_do_scan_bus(child);
88			pci_bus_size_bridges(child);
89		}
90		pci_configure_slot(dev);
91		pci_dev_put(dev);
92	}
93
94	pci_bus_assign_resources(parent);
95	pci_bus_add_devices(parent);
96	pci_enable_bridges(parent);
97	return 0;
98}
99
100int shpchp_unconfigure_device(struct slot *p_slot)
101{
102	int rc = 0;
103	int j;
104	u8 bctl = 0;
105	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
106	struct controller *ctrl = p_slot->ctrl;
107
108	ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
109		 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
110
111	for (j = 0; j < 8 ; j++) {
112		struct pci_dev *temp = pci_get_slot(parent,
113				(p_slot->device << 3) | j);
114		if (!temp)
115			continue;
116		if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
117			pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
118			if (bctl & PCI_BRIDGE_CTL_VGA) {
119				ctrl_err(ctrl,
120					 "Cannot remove display device %s\n",
121					 pci_name(temp));
122				pci_dev_put(temp);
123				rc = -EINVAL;
124				break;
125			}
126		}
127		pci_remove_bus_device(temp);
128		pci_dev_put(temp);
129	}
130	return rc;
131}
132
133