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/config.h>
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/errno.h>
41 #include <linux/pci.h>
42 #include <linux/string.h>
43 #include "cpci_hotplug.h"
45 #define DRIVER_VERSION "0.1"
46 #define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
47 #define DRIVER_DESC "Generic port I/O CompactPCI Hot Plug Driver"
50 #define MY_NAME "cpcihp_generic"
52 #define MY_NAME THIS_MODULE->name
55 #define dbg(format, arg...) \
58 printk (KERN_DEBUG "%s: " format "\n", \
61 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
62 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
63 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
68 static u8 bridge_busnr;
69 static u8 bridge_slot;
70 static struct pci_bus *bus;
74 static unsigned int enum_bit;
77 static struct cpci_hp_controller_ops generic_hpc_ops;
78 static struct cpci_hp_controller generic_hpc;
80 static int __init validate_parameters(void)
87 info("not configured, disabling.");
94 tmp = simple_strtoul(str, &p, 16);
95 if(p == str || tmp > 0xff) {
96 err("Invalid hotplug bus bridge device bus number");
99 bridge_busnr = (u8) tmp;
100 dbg("bridge_busnr = 0x%02x", bridge_busnr);
102 err("Invalid hotplug bus bridge device");
106 tmp = simple_strtoul(str, &p, 16);
107 if(p == str || tmp > 0x1f) {
108 err("Invalid hotplug bus bridge device slot number");
111 bridge_slot = (u8) tmp;
112 dbg("bridge_slot = 0x%02x", bridge_slot);
114 dbg("first_slot = 0x%02x", first_slot);
115 dbg("last_slot = 0x%02x", last_slot);
116 if(!(first_slot && last_slot)) {
117 err("Need to specify first_slot and last_slot");
120 if(last_slot < first_slot) {
121 err("first_slot must be less than last_slot");
125 dbg("port = 0x%04x", port);
126 dbg("enum_bit = 0x%02x", enum_bit);
128 err("Invalid #ENUM bit");
131 enum_mask = 1 << enum_bit;
135 static int query_enum(void)
140 return ((value & enum_mask) == enum_mask);
143 static int __init cpcihp_generic_init(void)
149 info(DRIVER_DESC " version: " DRIVER_VERSION);
150 status = validate_parameters();
154 r = request_region(port, 1, "#ENUM hotswap signal register");
158 dev = pci_find_slot(bridge_busnr, PCI_DEVFN(bridge_slot, 0));
159 if(!dev || dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
160 err("Invalid bridge device %s", bridge);
163 bus = dev->subordinate;
165 memset(&generic_hpc, 0, sizeof (struct cpci_hp_controller));
166 generic_hpc_ops.query_enum = query_enum;
167 generic_hpc.ops = &generic_hpc_ops;
169 status = cpci_hp_register_controller(&generic_hpc);
171 err("Could not register cPCI hotplug controller");
174 dbg("registered controller");
176 status = cpci_hp_register_bus(bus, first_slot, last_slot);
178 err("Could not register cPCI hotplug bus");
179 goto init_bus_register_error;
181 dbg("registered bus");
183 status = cpci_hp_start();
185 err("Could not started cPCI hotplug system");
186 goto init_start_error;
188 dbg("started cpci hp system");
191 cpci_hp_unregister_bus(bus);
192 init_bus_register_error:
193 cpci_hp_unregister_controller(&generic_hpc);
194 err("status = %d", status);
199 static void __exit cpcihp_generic_exit(void)
202 cpci_hp_unregister_bus(bus);
203 cpci_hp_unregister_controller(&generic_hpc);
204 release_region(port, 1);
207 module_init(cpcihp_generic_init);
208 module_exit(cpcihp_generic_exit);
210 MODULE_AUTHOR(DRIVER_AUTHOR);
211 MODULE_DESCRIPTION(DRIVER_DESC);
212 MODULE_LICENSE("GPL");
213 module_param(debug, bool, S_IRUGO | S_IWUSR);
214 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
215 module_param(bridge, charp, 0);
216 MODULE_PARM_DESC(bridge, "Hotswap bus bridge device, <bus>:<slot> (bus and slot are in hexadecimal)");
217 module_param(first_slot, byte, 0);
218 MODULE_PARM_DESC(first_slot, "Hotswap bus first slot number");
219 module_param(last_slot, byte, 0);
220 MODULE_PARM_DESC(last_slot, "Hotswap bus last slot number");
221 module_param(port, ushort, 0);
222 MODULE_PARM_DESC(port, "#ENUM signal I/O port");
223 module_param(enum_bit, uint, 0);
224 MODULE_PARM_DESC(enum_bit, "#ENUM signal bit (0-7)");