aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pci/hotplug/shpchp_pci.c
blob: 38009bc0fd5de7e21668763a958e7554347ac1f8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/*
 * Standard Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
 * 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 <greg@kroah.com>, <kristen.c.accardi@intel.com>
 *
 */

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

static void program_fw_provided_values(struct pci_dev *dev)
{
	u16 pci_cmd, pci_bctl;
	struct pci_dev *cdev;
	struct hotplug_params hpp = {0x8, 0x40, 0, 0}; /* defaults */

	/* Program hpp values for this device */
	if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
			(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
			(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
		return;

	get_hp_params_from_firmware(dev, &hpp);

	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp.cache_line_size);
	pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.latency_timer);
	pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
	if (hpp.enable_serr)
		pci_cmd |= PCI_COMMAND_SERR;
	else
		pci_cmd &= ~PCI_COMMAND_SERR;
	if (hpp.enable_perr)
		pci_cmd |= PCI_COMMAND_PARITY;
	else
		pci_cmd &= ~PCI_COMMAND_PARITY;
	pci_write_config_word(dev, PCI_COMMAND, pci_cmd);

	/* Program bridge control value and child devices */
	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
		pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
				hpp.latency_timer);
		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
		if (hpp.enable_serr)
			pci_bctl |= PCI_BRIDGE_CTL_SERR;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
		if (hpp.enable_perr)
			pci_bctl |= PCI_BRIDGE_CTL_PARITY;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
		pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
		if (dev->subordinate) {
			list_for_each_entry(cdev, &dev->subordinate->devices,
					bus_list)
				program_fw_provided_values(cdev);
		}
	}
}

int shpchp_configure_device(struct slot *p_slot)
{
	struct pci_dev *dev;
	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
	int num, fn;

	dev = pci_find_slot(p_slot->bus, PCI_DEVFN(p_slot->device, 0));
	if (dev) {
		err("Device %s already exists at %x:%x, cannot hot-add\n",
				pci_name(dev), p_slot->bus, p_slot->device);
		return -EINVAL;
	}

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

	for (fn = 0; fn < 8; fn++) {
		if (!(dev = pci_find_slot(p_slot->bus,
					PCI_DEVFN(p_slot->device, fn))))
			continue;
		if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
			err("Cannot hot-add display device %s\n",
					pci_name(dev));
			continue;
		}
		if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
				(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
			/* Find an unused bus number for the new bridge */
			struct pci_bus *child;
			unsigned char busnr, start = parent->secondary;
			unsigned char end = parent->subordinate;
			for (busnr = start; busnr <= end; busnr++) {
				if (!pci_find_bus(pci_domain_nr(parent),
							busnr))
					break;
			}
			if (busnr >= end) {
				err("No free bus for hot-added bridge\n");
				continue;
			}
			child = pci_add_new_bus(parent, dev, busnr);
			if (!child) {
				err("Cannot add new bus for %s\n",
						pci_name(dev));
				continue;
			}
			child->subordinate = pci_do_scan_bus(child);
			pci_bus_size_bridges(child);
		}
		program_fw_provided_values(dev);
	}

	pci_bus_assign_resources(parent);
	pci_bus_add_devices(parent);
	pci_enable_bridges(parent);
	return 0;
}

int shpchp_unconfigure_device(struct slot *p_slot)
{
	int rc = 0;
	int j;
	u8 bctl = 0;
	
	dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus, p_slot->device);

	for (j=0; j<8 ; j++) {
		struct pci_dev* temp = pci_find_slot(p_slot->bus,
				(p_slot->device << 3) | j);
		if (!temp)
			continue;
		if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
			err("Cannot remove display device %s\n",
					pci_name(temp));
			continue;
		}
		if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
			pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
			if (bctl & PCI_BRIDGE_CTL_VGA) {
				err("Cannot remove display device %s\n",
						pci_name(temp));
				continue;
			}
		}
		pci_remove_bus_device(temp);
	}
	return rc;
}