xref: /openbmc/linux/drivers/pci/hotplug/shpchp_pci.c (revision b34e08d5)
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 
37 int __ref shpchp_configure_device(struct slot *p_slot)
38 {
39 	struct pci_dev *dev;
40 	struct controller *ctrl = p_slot->ctrl;
41 	struct pci_dev *bridge = ctrl->pci_dev;
42 	struct pci_bus *parent = bridge->subordinate;
43 	int num, ret = 0;
44 
45 	pci_lock_rescan_remove();
46 
47 	dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
48 	if (dev) {
49 		ctrl_err(ctrl, "Device %s already exists "
50 			 "at %04x:%02x:%02x, cannot hot-add\n", pci_name(dev),
51 			 pci_domain_nr(parent), p_slot->bus, p_slot->device);
52 		pci_dev_put(dev);
53 		ret = -EINVAL;
54 		goto out;
55 	}
56 
57 	num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
58 	if (num == 0) {
59 		ctrl_err(ctrl, "No new device found\n");
60 		ret = -ENODEV;
61 		goto out;
62 	}
63 
64 	list_for_each_entry(dev, &parent->devices, bus_list) {
65 		if (PCI_SLOT(dev->devfn) != p_slot->device)
66 			continue;
67 		if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
68 		    (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
69 			pci_hp_add_bridge(dev);
70 	}
71 
72 	pci_assign_unassigned_bridge_resources(bridge);
73 
74 	list_for_each_entry(dev, &parent->devices, bus_list) {
75 		if (PCI_SLOT(dev->devfn) != p_slot->device)
76 			continue;
77 		pci_configure_slot(dev);
78 	}
79 
80 	pci_bus_add_devices(parent);
81 
82  out:
83 	pci_unlock_rescan_remove();
84 	return ret;
85 }
86 
87 int shpchp_unconfigure_device(struct slot *p_slot)
88 {
89 	int rc = 0;
90 	u8 bctl = 0;
91 	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
92 	struct pci_dev *dev, *temp;
93 	struct controller *ctrl = p_slot->ctrl;
94 
95 	ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
96 		 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
97 
98 	pci_lock_rescan_remove();
99 
100 	list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) {
101 		if (PCI_SLOT(dev->devfn) != p_slot->device)
102 			continue;
103 
104 		pci_dev_get(dev);
105 		if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
106 			pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
107 			if (bctl & PCI_BRIDGE_CTL_VGA) {
108 				ctrl_err(ctrl,
109 					 "Cannot remove display device %s\n",
110 					 pci_name(dev));
111 				pci_dev_put(dev);
112 				rc = -EINVAL;
113 				break;
114 			}
115 		}
116 		pci_stop_and_remove_bus_device(dev);
117 		pci_dev_put(dev);
118 	}
119 
120 	pci_unlock_rescan_remove();
121 	return rc;
122 }
123 
124