Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * PCI Express Hot Plug Controller Driver | |
3 | * | |
4 | * Copyright (C) 1995,2001 Compaq Computer Corporation | |
5 | * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) | |
6 | * Copyright (C) 2001 IBM Corp. | |
7 | * Copyright (C) 2003-2004 Intel Corporation | |
8 | * | |
9 | * All rights reserved. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or (at | |
14 | * your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, but | |
17 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
19 | * NON INFRINGEMENT. See the GNU General Public License for more | |
20 | * details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | * | |
8cf4c195 | 26 | * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> |
1da177e4 LT |
27 | * |
28 | */ | |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/moduleparam.h> | |
32 | #include <linux/kernel.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 | 34 | #include <linux/types.h> |
1da177e4 | 35 | #include <linux/pci.h> |
1da177e4 | 36 | #include "pciehp.h" |
1da177e4 | 37 | #include <linux/interrupt.h> |
34d03419 | 38 | #include <linux/time.h> |
1da177e4 LT |
39 | |
40 | /* Global variables */ | |
90ab5ee9 RR |
41 | bool pciehp_debug; |
42 | bool pciehp_poll_mode; | |
1da177e4 | 43 | int pciehp_poll_time; |
0b950f0f | 44 | static bool pciehp_force; |
1da177e4 LT |
45 | |
46 | #define DRIVER_VERSION "0.4" | |
47 | #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>" | |
48 | #define DRIVER_DESC "PCI Express Hot Plug Controller Driver" | |
49 | ||
50 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
51 | MODULE_DESCRIPTION(DRIVER_DESC); | |
52 | MODULE_LICENSE("GPL"); | |
53 | ||
54 | module_param(pciehp_debug, bool, 0644); | |
55 | module_param(pciehp_poll_mode, bool, 0644); | |
56 | module_param(pciehp_poll_time, int, 0644); | |
a3a45ec8 | 57 | module_param(pciehp_force, bool, 0644); |
1da177e4 LT |
58 | MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not"); |
59 | MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not"); | |
60 | MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds"); | |
28eb5f27 | 61 | MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing"); |
1da177e4 LT |
62 | |
63 | #define PCIE_MODULE_NAME "pciehp" | |
64 | ||
ff3ce480 BS |
65 | static int set_attention_status(struct hotplug_slot *slot, u8 value); |
66 | static int enable_slot(struct hotplug_slot *slot); | |
67 | static int disable_slot(struct hotplug_slot *slot); | |
68 | static int get_power_status(struct hotplug_slot *slot, u8 *value); | |
69 | static int get_attention_status(struct hotplug_slot *slot, u8 *value); | |
70 | static int get_latch_status(struct hotplug_slot *slot, u8 *value); | |
71 | static int get_adapter_status(struct hotplug_slot *slot, u8 *value); | |
72 | static int reset_slot(struct hotplug_slot *slot, int probe); | |
1da177e4 | 73 | |
b308240b DS |
74 | /** |
75 | * release_slot - free up the memory used by a slot | |
76 | * @hotplug_slot: slot to free | |
77 | */ | |
78 | static void release_slot(struct hotplug_slot *hotplug_slot) | |
79 | { | |
586f1d66 | 80 | kfree(hotplug_slot->ops); |
c4635eb0 KK |
81 | kfree(hotplug_slot->info); |
82 | kfree(hotplug_slot); | |
a0b17257 KK |
83 | } |
84 | ||
8720d27d | 85 | static int init_slot(struct controller *ctrl) |
1da177e4 | 86 | { |
8720d27d KK |
87 | struct slot *slot = ctrl->slot; |
88 | struct hotplug_slot *hotplug = NULL; | |
89 | struct hotplug_slot_info *info = NULL; | |
586f1d66 | 90 | struct hotplug_slot_ops *ops = NULL; |
e1acb24f | 91 | char name[SLOT_NAME_SIZE]; |
a0b17257 | 92 | int retval = -ENOMEM; |
1da177e4 | 93 | |
8720d27d KK |
94 | hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL); |
95 | if (!hotplug) | |
96 | goto out; | |
97 | ||
98 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
99 | if (!info) | |
100 | goto out; | |
101 | ||
586f1d66 KK |
102 | /* Setup hotplug slot ops */ |
103 | ops = kzalloc(sizeof(*ops), GFP_KERNEL); | |
104 | if (!ops) | |
105 | goto out; | |
9cad7f58 | 106 | |
586f1d66 KK |
107 | ops->enable_slot = enable_slot; |
108 | ops->disable_slot = disable_slot; | |
109 | ops->get_power_status = get_power_status; | |
110 | ops->get_adapter_status = get_adapter_status; | |
2e35afae | 111 | ops->reset_slot = reset_slot; |
586f1d66 KK |
112 | if (MRL_SENS(ctrl)) |
113 | ops->get_latch_status = get_latch_status; | |
114 | if (ATTN_LED(ctrl)) { | |
115 | ops->get_attention_status = get_attention_status; | |
116 | ops->set_attention_status = set_attention_status; | |
117 | } | |
118 | ||
8720d27d KK |
119 | /* register this slot with the hotplug pci core */ |
120 | hotplug->info = info; | |
121 | hotplug->private = slot; | |
122 | hotplug->release = &release_slot; | |
586f1d66 | 123 | hotplug->ops = ops; |
8720d27d | 124 | slot->hotplug_slot = hotplug; |
07a09694 | 125 | snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl)); |
8720d27d | 126 | |
8720d27d | 127 | retval = pci_hp_register(hotplug, |
385e2491 | 128 | ctrl->pcie->port->subordinate, 0, name); |
445f7985 | 129 | if (retval) |
3784e0c6 | 130 | ctrl_err(ctrl, "pci_hp_register failed: error %d\n", retval); |
8720d27d KK |
131 | out: |
132 | if (retval) { | |
586f1d66 | 133 | kfree(ops); |
8720d27d KK |
134 | kfree(info); |
135 | kfree(hotplug); | |
1da177e4 | 136 | } |
a0b17257 | 137 | return retval; |
1da177e4 LT |
138 | } |
139 | ||
8720d27d | 140 | static void cleanup_slot(struct controller *ctrl) |
1da177e4 | 141 | { |
8720d27d | 142 | pci_hp_deregister(ctrl->slot->hotplug_slot); |
1da177e4 LT |
143 | } |
144 | ||
1da177e4 LT |
145 | /* |
146 | * set_attention_status - Turns the Amber LED for a slot on, off or blink | |
147 | */ | |
148 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
149 | { | |
150 | struct slot *slot = hotplug_slot->private; | |
151 | ||
6dae6202 BH |
152 | pciehp_set_attention_status(slot, status); |
153 | return 0; | |
1da177e4 LT |
154 | } |
155 | ||
156 | ||
157 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
158 | { | |
159 | struct slot *slot = hotplug_slot->private; | |
160 | ||
5d386e1a | 161 | return pciehp_sysfs_enable_slot(slot); |
1da177e4 LT |
162 | } |
163 | ||
164 | ||
165 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
166 | { | |
167 | struct slot *slot = hotplug_slot->private; | |
168 | ||
5d386e1a | 169 | return pciehp_sysfs_disable_slot(slot); |
1da177e4 LT |
170 | } |
171 | ||
172 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
173 | { | |
174 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 175 | |
6dae6202 BH |
176 | pciehp_get_power_status(slot, value); |
177 | return 0; | |
1da177e4 LT |
178 | } |
179 | ||
180 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
181 | { | |
182 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 183 | |
6dae6202 BH |
184 | pciehp_get_attention_status(slot, value); |
185 | return 0; | |
1da177e4 LT |
186 | } |
187 | ||
188 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
189 | { | |
190 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 191 | |
6dae6202 BH |
192 | pciehp_get_latch_status(slot, value); |
193 | return 0; | |
1da177e4 LT |
194 | } |
195 | ||
196 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
197 | { | |
198 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 199 | |
6dae6202 BH |
200 | pciehp_get_adapter_status(slot, value); |
201 | return 0; | |
1da177e4 LT |
202 | } |
203 | ||
2e35afae AW |
204 | static int reset_slot(struct hotplug_slot *hotplug_slot, int probe) |
205 | { | |
206 | struct slot *slot = hotplug_slot->private; | |
207 | ||
2e35afae AW |
208 | return pciehp_reset_slot(slot, probe); |
209 | } | |
210 | ||
0516c8bc | 211 | static int pciehp_probe(struct pcie_device *dev) |
1da177e4 LT |
212 | { |
213 | int rc; | |
214 | struct controller *ctrl; | |
8720d27d | 215 | struct slot *slot; |
8792e11f | 216 | u8 occupied, poweron; |
125c39f7 | 217 | |
e705c295 RW |
218 | /* If this is not a "hotplug" service, we have no business here. */ |
219 | if (dev->service != PCIE_PORT_SERVICE_HP) | |
220 | return -ENODEV; | |
a073a826 | 221 | |
62e4492c AN |
222 | if (!dev->port->subordinate) { |
223 | /* Can happen if we run out of bus numbers during probe */ | |
224 | dev_err(&dev->device, | |
225 | "Hotplug bridge without secondary bus, ignoring\n"); | |
2af31f41 | 226 | return -ENODEV; |
62e4492c AN |
227 | } |
228 | ||
c4635eb0 | 229 | ctrl = pcie_init(dev); |
1da177e4 | 230 | if (!ctrl) { |
18b341b7 | 231 | dev_err(&dev->device, "Controller initialization failed\n"); |
2af31f41 | 232 | return -ENODEV; |
1da177e4 | 233 | } |
b9708940 | 234 | set_service_data(dev, ctrl); |
1da177e4 | 235 | |
1da177e4 | 236 | /* Setup the slot information structures */ |
8720d27d | 237 | rc = init_slot(ctrl); |
1da177e4 | 238 | if (rc) { |
f46753c5 | 239 | if (rc == -EBUSY) |
227f0647 | 240 | ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n"); |
f46753c5 | 241 | else |
3784e0c6 | 242 | ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc); |
a8c2b635 | 243 | goto err_out_release_ctlr; |
1da177e4 LT |
244 | } |
245 | ||
dbc7e1e5 EB |
246 | /* Enable events after we have setup the data structures */ |
247 | rc = pcie_init_notification(ctrl); | |
248 | if (rc) { | |
3784e0c6 | 249 | ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc); |
65b947bc | 250 | goto err_out_free_ctrl_slot; |
dbc7e1e5 EB |
251 | } |
252 | ||
db9aaf0b | 253 | /* Check if slot is occupied */ |
8720d27d | 254 | slot = ctrl->slot; |
8792e11f KK |
255 | pciehp_get_adapter_status(slot, &occupied); |
256 | pciehp_get_power_status(slot, &poweron); | |
50b52fde RJ |
257 | if (occupied && pciehp_force) { |
258 | mutex_lock(&slot->hotplug_lock); | |
8792e11f | 259 | pciehp_enable_slot(slot); |
50b52fde RJ |
260 | mutex_unlock(&slot->hotplug_lock); |
261 | } | |
8792e11f KK |
262 | /* If empty slot's power status is on, turn power off */ |
263 | if (!occupied && poweron && POWER_CTRL(ctrl)) | |
264 | pciehp_power_off_slot(slot); | |
1da177e4 | 265 | |
1da177e4 LT |
266 | return 0; |
267 | ||
268 | err_out_free_ctrl_slot: | |
8720d27d | 269 | cleanup_slot(ctrl); |
a8c2b635 | 270 | err_out_release_ctlr: |
82a9e79e | 271 | pciehp_release_ctrl(ctrl); |
1da177e4 LT |
272 | return -ENODEV; |
273 | } | |
274 | ||
82a9e79e | 275 | static void pciehp_remove(struct pcie_device *dev) |
1da177e4 | 276 | { |
b9708940 | 277 | struct controller *ctrl = get_service_data(dev); |
1da177e4 | 278 | |
8720d27d | 279 | cleanup_slot(ctrl); |
82a9e79e | 280 | pciehp_release_ctrl(ctrl); |
1da177e4 LT |
281 | } |
282 | ||
283 | #ifdef CONFIG_PM | |
3c78bc61 | 284 | static int pciehp_suspend(struct pcie_device *dev) |
1da177e4 | 285 | { |
1da177e4 LT |
286 | return 0; |
287 | } | |
288 | ||
3c78bc61 | 289 | static int pciehp_resume(struct pcie_device *dev) |
1da177e4 | 290 | { |
87683e22 ON |
291 | struct controller *ctrl; |
292 | struct slot *slot; | |
293 | u8 status; | |
294 | ||
87683e22 | 295 | ctrl = get_service_data(dev); |
cd2fe83a | 296 | |
87683e22 ON |
297 | /* reinitialize the chipset's event detection logic */ |
298 | pcie_enable_notification(ctrl); | |
cd2fe83a | 299 | |
87683e22 | 300 | slot = ctrl->slot; |
cd2fe83a | 301 | |
87683e22 ON |
302 | /* Check if slot is occupied */ |
303 | pciehp_get_adapter_status(slot, &status); | |
50b52fde | 304 | mutex_lock(&slot->hotplug_lock); |
87683e22 ON |
305 | if (status) |
306 | pciehp_enable_slot(slot); | |
307 | else | |
308 | pciehp_disable_slot(slot); | |
50b52fde | 309 | mutex_unlock(&slot->hotplug_lock); |
1da177e4 LT |
310 | return 0; |
311 | } | |
3a3c244c | 312 | #endif /* PM */ |
1da177e4 | 313 | |
1da177e4 | 314 | static struct pcie_port_service_driver hpdriver_portdrv = { |
83e9ad54 | 315 | .name = PCIE_MODULE_NAME, |
22106368 RW |
316 | .port_type = PCIE_ANY_PORT, |
317 | .service = PCIE_PORT_SERVICE_HP, | |
1da177e4 LT |
318 | |
319 | .probe = pciehp_probe, | |
320 | .remove = pciehp_remove, | |
321 | ||
322 | #ifdef CONFIG_PM | |
323 | .suspend = pciehp_suspend, | |
324 | .resume = pciehp_resume, | |
325 | #endif /* PM */ | |
326 | }; | |
327 | ||
328 | static int __init pcied_init(void) | |
329 | { | |
330 | int retval = 0; | |
331 | ||
a8a2be94 | 332 | retval = pcie_port_service_register(&hpdriver_portdrv); |
f7625980 BH |
333 | dbg("pcie_port_service_register = %d\n", retval); |
334 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); | |
c2be6f93 | 335 | if (retval) |
18b341b7 | 336 | dbg("Failure to register service\n"); |
c2be6f93 | 337 | |
1da177e4 LT |
338 | return retval; |
339 | } | |
340 | ||
341 | static void __exit pcied_cleanup(void) | |
342 | { | |
343 | dbg("unload_pciehpd()\n"); | |
027e8d52 | 344 | pcie_port_service_unregister(&hpdriver_portdrv); |
1da177e4 LT |
345 | info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); |
346 | } | |
347 | ||
348 | module_init(pcied_init); | |
349 | module_exit(pcied_cleanup); |