4 * Generic port I/O CompactPCI driver
6 * Copyright 2002 SOMA Networks, Inc.
7 * Copyright 2001 Intel San Luis Obispo
8 * Copyright 2000,2001 MontaVista Software Inc.
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
15 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
16 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
22 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
23 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 * You should have received a copy of the GNU General Public License along
27 * with this program; if not, write to the Free Software Foundation, Inc.,
28 * 675 Mass Ave, Cambridge, MA 02139, USA.
30 * This generic CompactPCI hotplug driver should allow using the PCI hotplug
31 * mechanism on any CompactPCI board that exposes the #ENUM signal as a bit
32 * in a system register that can be read through standard port I/O.
34 * Send feedback to <scottm@somanetworks.com>
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/errno.h>
40 #include <linux/pci.h>
41 #include <linux/string.h>
42 #include "cpci_hotplug.h"
44 #define DRIVER_VERSION "0.1"
45 #define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
46 #define DRIVER_DESC "Generic port I/O CompactPCI Hot Plug Driver"
49 #define MY_NAME "cpcihp_generic"
51 #define MY_NAME THIS_MODULE->name
54 #define dbg(format, arg...) \
57 printk (KERN_DEBUG "%s: " format "\n", \
60 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
61 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
62 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
67 static u8 bridge_busnr;
68 static u8 bridge_slot;
69 static struct pci_bus *bus;
73 static unsigned int enum_bit;
76 static struct cpci_hp_controller_ops generic_hpc_ops;
77 static struct cpci_hp_controller generic_hpc;
79 static int __init validate_parameters(void)
86 info("not configured, disabling.");
93 tmp = simple_strtoul(str, &p, 16);
94 if(p == str || tmp > 0xff) {
95 err("Invalid hotplug bus bridge device bus number");
98 bridge_busnr = (u8) tmp;
99 dbg("bridge_busnr = 0x%02x", bridge_busnr);
101 err("Invalid hotplug bus bridge device");
105 tmp = simple_strtoul(str, &p, 16);
106 if(p == str || tmp > 0x1f) {
107 err("Invalid hotplug bus bridge device slot number");
110 bridge_slot = (u8) tmp;
111 dbg("bridge_slot = 0x%02x", bridge_slot);
113 dbg("first_slot = 0x%02x", first_slot);
114 dbg("last_slot = 0x%02x", last_slot);
115 if(!(first_slot && last_slot)) {
116 err("Need to specify first_slot and last_slot");
119 if(last_slot < first_slot) {
120 err("first_slot must be less than last_slot");
124 dbg("port = 0x%04x", port);
125 dbg("enum_bit = 0x%02x", enum_bit);
127 err("Invalid #ENUM bit");
130 enum_mask = 1 << enum_bit;
134 static int query_enum(void)
139 return ((value & enum_mask) == enum_mask);
142 static int __init cpcihp_generic_init(void)
148 info(DRIVER_DESC " version: " DRIVER_VERSION);
149 status = validate_parameters();
153 r = request_region(port, 1, "#ENUM hotswap signal register");
157 bus = pci_find_bus(0, bridge_busnr);
159 err("Invalid bus number %d", bridge_busnr);
162 dev = pci_get_slot(bus, PCI_DEVFN(bridge_slot, 0));
163 if(!dev || dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
164 err("Invalid bridge device %s", bridge);
167 bus = dev->subordinate;
170 memset(&generic_hpc, 0, sizeof (struct cpci_hp_controller));
171 generic_hpc_ops.query_enum = query_enum;
172 generic_hpc.ops = &generic_hpc_ops;
174 status = cpci_hp_register_controller(&generic_hpc);
176 err("Could not register cPCI hotplug controller");
179 dbg("registered controller");
181 status = cpci_hp_register_bus(bus, first_slot, last_slot);
183 err("Could not register cPCI hotplug bus");
184 goto init_bus_register_error;
186 dbg("registered bus");
188 status = cpci_hp_start();
190 err("Could not started cPCI hotplug system");
191 goto init_start_error;
193 dbg("started cpci hp system");
196 cpci_hp_unregister_bus(bus);
197 init_bus_register_error:
198 cpci_hp_unregister_controller(&generic_hpc);
199 err("status = %d", status);
204 static void __exit cpcihp_generic_exit(void)
207 cpci_hp_unregister_bus(bus);
208 cpci_hp_unregister_controller(&generic_hpc);
209 release_region(port, 1);
212 module_init(cpcihp_generic_init);
213 module_exit(cpcihp_generic_exit);
215 MODULE_AUTHOR(DRIVER_AUTHOR);
216 MODULE_DESCRIPTION(DRIVER_DESC);
217 MODULE_LICENSE("GPL");
218 module_param(debug, bool, S_IRUGO | S_IWUSR);
219 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
220 module_param(bridge, charp, 0);
221 MODULE_PARM_DESC(bridge, "Hotswap bus bridge device, <bus>:<slot> (bus and slot are in hexadecimal)");
222 module_param(first_slot, byte, 0);
223 MODULE_PARM_DESC(first_slot, "Hotswap bus first slot number");
224 module_param(last_slot, byte, 0);
225 MODULE_PARM_DESC(last_slot, "Hotswap bus last slot number");
226 module_param(port, ushort, 0);
227 MODULE_PARM_DESC(port, "#ENUM signal I/O port");
228 module_param(enum_bit, uint, 0);
229 MODULE_PARM_DESC(enum_bit, "#ENUM signal bit (0-7)");