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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
65static bool debug;
66static char *bridge;
67static u8 bridge_busnr;
68static u8 bridge_slot;
69static struct pci_bus *bus;
70static u8 first_slot;
71static u8 last_slot;
72static u16 port;
73static unsigned int enum_bit;
74static u8 enum_mask;
75
76static struct cpci_hp_controller_ops generic_hpc_ops;
77static struct cpci_hp_controller generic_hpc;
78
79static 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
134static int query_enum(void)
135{
136 u8 value;
137
138 value = inb_p(port);
139 return ((value & enum_mask) == enum_mask);
140}
141
142static 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_get_domain_bus_and_slot(0, bridge_busnr,
158 PCI_DEVFN(bridge_slot, 0));
159 if (!dev || dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
160 err("Invalid bridge device %s", bridge);
161 pci_dev_put(dev);
162 return -EINVAL;
163 }
164 bus = dev->subordinate;
165 pci_dev_put(dev);
166
167 memset(&generic_hpc, 0, sizeof(struct cpci_hp_controller));
168 generic_hpc_ops.query_enum = query_enum;
169 generic_hpc.ops = &generic_hpc_ops;
170
171 status = cpci_hp_register_controller(&generic_hpc);
172 if (status != 0) {
173 err("Could not register cPCI hotplug controller");
174 return -ENODEV;
175 }
176 dbg("registered controller");
177
178 status = cpci_hp_register_bus(bus, first_slot, last_slot);
179 if (status != 0) {
180 err("Could not register cPCI hotplug bus");
181 goto init_bus_register_error;
182 }
183 dbg("registered bus");
184
185 status = cpci_hp_start();
186 if (status != 0) {
187 err("Could not started cPCI hotplug system");
188 goto init_start_error;
189 }
190 dbg("started cpci hp system");
191 return 0;
192init_start_error:
193 cpci_hp_unregister_bus(bus);
194init_bus_register_error:
195 cpci_hp_unregister_controller(&generic_hpc);
196 err("status = %d", status);
197 return status;
198
199}
200
201static void __exit cpcihp_generic_exit(void)
202{
203 cpci_hp_stop();
204 cpci_hp_unregister_bus(bus);
205 cpci_hp_unregister_controller(&generic_hpc);
206 release_region(port, 1);
207}
208
209module_init(cpcihp_generic_init);
210module_exit(cpcihp_generic_exit);
211
212MODULE_AUTHOR(DRIVER_AUTHOR);
213MODULE_DESCRIPTION(DRIVER_DESC);
214MODULE_LICENSE("GPL");
215module_param(debug, bool, S_IRUGO | S_IWUSR);
216MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
217module_param(bridge, charp, 0);
218MODULE_PARM_DESC(bridge, "Hotswap bus bridge device, <bus>:<slot> (bus and slot are in hexadecimal)");
219module_param(first_slot, byte, 0);
220MODULE_PARM_DESC(first_slot, "Hotswap bus first slot number");
221module_param(last_slot, byte, 0);
222MODULE_PARM_DESC(last_slot, "Hotswap bus last slot number");
223module_param(port, ushort, 0);
224MODULE_PARM_DESC(port, "#ENUM signal I/O port");
225module_param(enum_bit, uint, 0);
226MODULE_PARM_DESC(enum_bit, "#ENUM signal bit (0-7)");
227
