1 /*
2 * cpcihp_generic.c
3 *
4 * Generic port I/O CompactPCI driver
5 *
6 * Copyright 2002 SOMA Networks, Inc.
7 * Copyright 2001 Intel San Luis Obispo
8 * Copyright 2000,2001 MontaVista Software Inc.
9 *
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.
14 *
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.
25 *
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.
29 *
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.
33 *
34 * Send feedback to <scottm@somanetworks.com>
35 */
36
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"
43
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"
47
48 #if !defined(MODULE)
49 #define MY_NAME "cpcihp_generic"
50 #else
51 #define MY_NAME THIS_MODULE->name
52 #endif
53
54 #define dbg(format, arg...) \
55 do { \
56 if(debug) \
57 printk (KERN_DEBUG "%s: " format "\n", \
58 MY_NAME , ## arg); \
59 } while(0)
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)
63
64 /* local variables */
65 static int debug;
66 static char *bridge;
67 static u8 bridge_busnr;
68 static u8 bridge_slot;
69 static struct pci_bus *bus;
70 static u8 first_slot;
71 static u8 last_slot;
72 static u16 port;
73 static unsigned int enum_bit;
74 static u8 enum_mask;
75
76 static struct cpci_hp_controller_ops generic_hpc_ops;
77 static struct cpci_hp_controller generic_hpc;
78
79 static int __init validate_parameters(void)
80 {
81 char* str;
82 char* p;
83 unsigned long tmp;
84
85 if(!bridge) {
86 info("not configured, disabling.");
87 return -EINVAL;
88 }
89 str = bridge;
90 if(!*str)
91 return -EINVAL;
92
93 tmp = simple_strtoul(str, &p, 16);
94 if(p == str || tmp > 0xff) {
95 err("Invalid hotplug bus bridge device bus number");
96 return -EINVAL;
97 }
98 bridge_busnr = (u8) tmp;
99 dbg("bridge_busnr = 0x%02x", bridge_busnr);
100 if(*p != ':') {
101 err("Invalid hotplug bus bridge device");
102 return -EINVAL;
103 }
104 str = p + 1;
105 tmp = simple_strtoul(str, &p, 16);
106 if(p == str || tmp > 0x1f) {
107 err("Invalid hotplug bus bridge device slot number");
108 return -EINVAL;
109 }
110 bridge_slot = (u8) tmp;
111 dbg("bridge_slot = 0x%02x", bridge_slot);
112
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");
117 return -EINVAL;
118 }
119 if(last_slot < first_slot) {
120 err("first_slot must be less than last_slot");
121 return -EINVAL;
122 }
123
124 dbg("port = 0x%04x", port);
125 dbg("enum_bit = 0x%02x", enum_bit);
126 if(enum_bit > 7) {
127 err("Invalid #ENUM bit");
128 return -EINVAL;
129 }
130 enum_mask = 1 << enum_bit;
131 return 0;
132 }
133
134 static int query_enum(void)
135 {
136 u8 value;
137
138 value = inb_p(port);
139 return ((value & enum_mask) == enum_mask);
140 }
141
142 static int __init cpcihp_generic_init(void)
143 {
144 int status;
145 struct resource* r;
146 struct pci_dev* dev;
147
148 info(DRIVER_DESC " version: " DRIVER_VERSION);
149 status = validate_parameters();
150 if (status)
151 return status;
152
153 r = request_region(port, 1, "#ENUM hotswap signal register");
154 if(!r)
155 return -EBUSY;
156
157 dev = pci_find_slot(bridge_busnr, PCI_DEVFN(bridge_slot, 0));
158 if(!dev || dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
159 err("Invalid bridge device %s", bridge);
160 return -EINVAL;
161 }
162 bus = dev->subordinate;
163
164 memset(&generic_hpc, 0, sizeof (struct cpci_hp_controller));
165 generic_hpc_ops.query_enum = query_enum;
166 generic_hpc.ops = &generic_hpc_ops;
167
168 status = cpci_hp_register_controller(&generic_hpc);
169 if(status != 0) {
170 err("Could not register cPCI hotplug controller");
171 return -ENODEV;
172 }
173 dbg("registered controller");
174
175 status = cpci_hp_register_bus(bus, first_slot, last_slot);
176 if(status != 0) {
177 err("Could not register cPCI hotplug bus");
178 goto init_bus_register_error;
179 }
180 dbg("registered bus");
181
182 status = cpci_hp_start();
183 if(status != 0) {
184 err("Could not started cPCI hotplug system");
185 goto init_start_error;
186 }
187 dbg("started cpci hp system");
188 return 0;
189 init_start_error:
190 cpci_hp_unregister_bus(bus);
191 init_bus_register_error:
192 cpci_hp_unregister_controller(&generic_hpc);
193 err("status = %d", status);
194 return status;
195
196 }
197
198 static void __exit cpcihp_generic_exit(void)
199 {
200 cpci_hp_stop();
201 cpci_hp_unregister_bus(bus);
202 cpci_hp_unregister_controller(&generic_hpc);
203 release_region(port, 1);
204 }
205
206 module_init(cpcihp_generic_init);
207 module_exit(cpcihp_generic_exit);
208
209 MODULE_AUTHOR(DRIVER_AUTHOR);
210 MODULE_DESCRIPTION(DRIVER_DESC);
211 MODULE_LICENSE("GPL");
212 module_param(debug, bool, S_IRUGO | S_IWUSR);
213 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
214 module_param(bridge, charp, 0);
215 MODULE_PARM_DESC(bridge, "Hotswap bus bridge device, <bus>:<slot> (bus and slot are in hexadecimal)");
216 module_param(first_slot, byte, 0);
217 MODULE_PARM_DESC(first_slot, "Hotswap bus first slot number");
218 module_param(last_slot, byte, 0);
219 MODULE_PARM_DESC(last_slot, "Hotswap bus last slot number");
220 module_param(port, ushort, 0);
221 MODULE_PARM_DESC(port, "#ENUM signal I/O port");
222 module_param(enum_bit, uint, 0);
223 MODULE_PARM_DESC(enum_bit, "#ENUM signal bit (0-7)");
224
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