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> | |
33 | #include <linux/types.h> | |
1da177e4 | 34 | #include <linux/pci.h> |
1da177e4 | 35 | #include "pciehp.h" |
1da177e4 | 36 | #include <linux/interrupt.h> |
34d03419 | 37 | #include <linux/time.h> |
1da177e4 LT |
38 | |
39 | /* Global variables */ | |
40 | int pciehp_debug; | |
41 | int pciehp_poll_mode; | |
42 | int pciehp_poll_time; | |
a3a45ec8 | 43 | int pciehp_force; |
5d386e1a | 44 | struct workqueue_struct *pciehp_wq; |
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"); | |
a3a45ec8 | 61 | MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing"); |
1da177e4 LT |
62 | |
63 | #define PCIE_MODULE_NAME "pciehp" | |
64 | ||
1da177e4 LT |
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 get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); | |
73 | static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value); | |
74 | ||
b308240b DS |
75 | /** |
76 | * release_slot - free up the memory used by a slot | |
77 | * @hotplug_slot: slot to free | |
78 | */ | |
79 | static void release_slot(struct hotplug_slot *hotplug_slot) | |
80 | { | |
7f2feec1 TI |
81 | struct slot *slot = hotplug_slot->private; |
82 | ||
18b341b7 | 83 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 84 | __func__, hotplug_slot_name(hotplug_slot)); |
b308240b | 85 | |
586f1d66 | 86 | kfree(hotplug_slot->ops); |
c4635eb0 KK |
87 | kfree(hotplug_slot->info); |
88 | kfree(hotplug_slot); | |
a0b17257 KK |
89 | } |
90 | ||
8720d27d | 91 | static int init_slot(struct controller *ctrl) |
1da177e4 | 92 | { |
8720d27d KK |
93 | struct slot *slot = ctrl->slot; |
94 | struct hotplug_slot *hotplug = NULL; | |
95 | struct hotplug_slot_info *info = NULL; | |
586f1d66 | 96 | struct hotplug_slot_ops *ops = NULL; |
e1acb24f | 97 | char name[SLOT_NAME_SIZE]; |
a0b17257 | 98 | int retval = -ENOMEM; |
1da177e4 | 99 | |
8720d27d KK |
100 | hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL); |
101 | if (!hotplug) | |
102 | goto out; | |
103 | ||
104 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
105 | if (!info) | |
106 | goto out; | |
107 | ||
586f1d66 KK |
108 | /* Setup hotplug slot ops */ |
109 | ops = kzalloc(sizeof(*ops), GFP_KERNEL); | |
110 | if (!ops) | |
111 | goto out; | |
112 | ops->enable_slot = enable_slot; | |
113 | ops->disable_slot = disable_slot; | |
114 | ops->get_power_status = get_power_status; | |
115 | ops->get_adapter_status = get_adapter_status; | |
116 | ops->get_max_bus_speed = get_max_bus_speed; | |
117 | ops->get_cur_bus_speed = get_cur_bus_speed; | |
118 | if (MRL_SENS(ctrl)) | |
119 | ops->get_latch_status = get_latch_status; | |
120 | if (ATTN_LED(ctrl)) { | |
121 | ops->get_attention_status = get_attention_status; | |
122 | ops->set_attention_status = set_attention_status; | |
123 | } | |
124 | ||
8720d27d KK |
125 | /* register this slot with the hotplug pci core */ |
126 | hotplug->info = info; | |
127 | hotplug->private = slot; | |
128 | hotplug->release = &release_slot; | |
586f1d66 | 129 | hotplug->ops = ops; |
8720d27d | 130 | slot->hotplug_slot = hotplug; |
07a09694 | 131 | snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl)); |
8720d27d | 132 | |
a2359a33 | 133 | ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n", |
385e2491 | 134 | pci_domain_nr(ctrl->pcie->port->subordinate), |
07a09694 | 135 | ctrl->pcie->port->subordinate->number, PSN(ctrl)); |
8720d27d | 136 | retval = pci_hp_register(hotplug, |
385e2491 | 137 | ctrl->pcie->port->subordinate, 0, name); |
445f7985 | 138 | if (retval) |
8720d27d KK |
139 | ctrl_err(ctrl, |
140 | "pci_hp_register failed with error %d\n", retval); | |
8720d27d KK |
141 | out: |
142 | if (retval) { | |
586f1d66 | 143 | kfree(ops); |
8720d27d KK |
144 | kfree(info); |
145 | kfree(hotplug); | |
1da177e4 | 146 | } |
a0b17257 | 147 | return retval; |
1da177e4 LT |
148 | } |
149 | ||
8720d27d | 150 | static void cleanup_slot(struct controller *ctrl) |
1da177e4 | 151 | { |
8720d27d | 152 | pci_hp_deregister(ctrl->slot->hotplug_slot); |
1da177e4 LT |
153 | } |
154 | ||
1da177e4 LT |
155 | /* |
156 | * set_attention_status - Turns the Amber LED for a slot on, off or blink | |
157 | */ | |
158 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
159 | { | |
160 | struct slot *slot = hotplug_slot->private; | |
161 | ||
18b341b7 | 162 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 163 | __func__, slot_name(slot)); |
1da177e4 | 164 | |
445f7985 | 165 | return pciehp_set_attention_status(slot, status); |
1da177e4 LT |
166 | } |
167 | ||
168 | ||
169 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
170 | { | |
171 | struct slot *slot = hotplug_slot->private; | |
172 | ||
18b341b7 | 173 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 174 | __func__, slot_name(slot)); |
1da177e4 | 175 | |
5d386e1a | 176 | return pciehp_sysfs_enable_slot(slot); |
1da177e4 LT |
177 | } |
178 | ||
179 | ||
180 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
181 | { | |
182 | struct slot *slot = hotplug_slot->private; | |
183 | ||
18b341b7 | 184 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 185 | __func__, slot_name(slot)); |
1da177e4 | 186 | |
5d386e1a | 187 | return pciehp_sysfs_disable_slot(slot); |
1da177e4 LT |
188 | } |
189 | ||
190 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
191 | { | |
192 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 193 | |
18b341b7 | 194 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 195 | __func__, slot_name(slot)); |
1da177e4 | 196 | |
445f7985 | 197 | return pciehp_get_power_status(slot, value); |
1da177e4 LT |
198 | } |
199 | ||
200 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
201 | { | |
202 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 203 | |
18b341b7 | 204 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 205 | __func__, slot_name(slot)); |
1da177e4 | 206 | |
445f7985 | 207 | return pciehp_get_attention_status(slot, value); |
1da177e4 LT |
208 | } |
209 | ||
210 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
211 | { | |
212 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 213 | |
18b341b7 | 214 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 215 | __func__, slot_name(slot)); |
1da177e4 | 216 | |
445f7985 | 217 | return pciehp_get_latch_status(slot, value); |
1da177e4 LT |
218 | } |
219 | ||
220 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
221 | { | |
222 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 223 | |
18b341b7 | 224 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 225 | __func__, slot_name(slot)); |
1da177e4 | 226 | |
445f7985 | 227 | return pciehp_get_adapter_status(slot, value); |
1da177e4 LT |
228 | } |
229 | ||
f46753c5 AC |
230 | static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, |
231 | enum pci_bus_speed *value) | |
1da177e4 LT |
232 | { |
233 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 234 | |
18b341b7 | 235 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 236 | __func__, slot_name(slot)); |
a073a826 | 237 | |
445f7985 | 238 | return pciehp_get_max_link_speed(slot, value); |
1da177e4 LT |
239 | } |
240 | ||
241 | static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) | |
242 | { | |
243 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 244 | |
18b341b7 | 245 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 246 | __func__, slot_name(slot)); |
a073a826 | 247 | |
445f7985 | 248 | return pciehp_get_cur_link_speed(slot, value); |
1da177e4 LT |
249 | } |
250 | ||
0516c8bc | 251 | static int pciehp_probe(struct pcie_device *dev) |
1da177e4 LT |
252 | { |
253 | int rc; | |
254 | struct controller *ctrl; | |
8720d27d | 255 | struct slot *slot; |
1da177e4 | 256 | u8 value; |
125c39f7 KK |
257 | struct pci_dev *pdev = dev->port; |
258 | ||
259 | if (pciehp_force) | |
7f2feec1 TI |
260 | dev_info(&dev->device, |
261 | "Bypassing BIOS check for pciehp use on %s\n", | |
262 | pci_name(pdev)); | |
125c39f7 KK |
263 | else if (pciehp_get_hp_hw_control_from_firmware(pdev)) |
264 | goto err_out_none; | |
a073a826 | 265 | |
c4635eb0 | 266 | ctrl = pcie_init(dev); |
1da177e4 | 267 | if (!ctrl) { |
18b341b7 | 268 | dev_err(&dev->device, "Controller initialization failed\n"); |
c4635eb0 | 269 | goto err_out_none; |
1da177e4 | 270 | } |
b9708940 | 271 | set_service_data(dev, ctrl); |
1da177e4 | 272 | |
1da177e4 | 273 | /* Setup the slot information structures */ |
8720d27d | 274 | rc = init_slot(ctrl); |
1da177e4 | 275 | if (rc) { |
f46753c5 | 276 | if (rc == -EBUSY) |
18b341b7 | 277 | ctrl_warn(ctrl, "Slot already registered by another " |
7f2feec1 | 278 | "hotplug driver\n"); |
f46753c5 | 279 | else |
18b341b7 | 280 | ctrl_err(ctrl, "Slot initialization failed\n"); |
a8c2b635 | 281 | goto err_out_release_ctlr; |
1da177e4 LT |
282 | } |
283 | ||
dbc7e1e5 EB |
284 | /* Enable events after we have setup the data structures */ |
285 | rc = pcie_init_notification(ctrl); | |
286 | if (rc) { | |
287 | ctrl_err(ctrl, "Notification initialization failed\n"); | |
65b947bc | 288 | goto err_out_free_ctrl_slot; |
dbc7e1e5 EB |
289 | } |
290 | ||
db9aaf0b | 291 | /* Check if slot is occupied */ |
8720d27d | 292 | slot = ctrl->slot; |
82a9e79e | 293 | pciehp_get_adapter_status(slot, &value); |
db9aaf0b KK |
294 | if (value) { |
295 | if (pciehp_force) | |
8720d27d | 296 | pciehp_enable_slot(slot); |
db9aaf0b KK |
297 | } else { |
298 | /* Power off slot if not occupied */ | |
299 | if (POWER_CTRL(ctrl)) { | |
82a9e79e | 300 | rc = pciehp_power_off_slot(slot); |
db9aaf0b KK |
301 | if (rc) |
302 | goto err_out_free_ctrl_slot; | |
303 | } | |
1da177e4 LT |
304 | } |
305 | ||
1da177e4 LT |
306 | return 0; |
307 | ||
308 | err_out_free_ctrl_slot: | |
8720d27d | 309 | cleanup_slot(ctrl); |
a8c2b635 | 310 | err_out_release_ctlr: |
82a9e79e | 311 | pciehp_release_ctrl(ctrl); |
1da177e4 LT |
312 | err_out_none: |
313 | return -ENODEV; | |
314 | } | |
315 | ||
82a9e79e | 316 | static void pciehp_remove(struct pcie_device *dev) |
1da177e4 | 317 | { |
b9708940 | 318 | struct controller *ctrl = get_service_data(dev); |
1da177e4 | 319 | |
8720d27d | 320 | cleanup_slot(ctrl); |
82a9e79e | 321 | pciehp_release_ctrl(ctrl); |
1da177e4 LT |
322 | } |
323 | ||
324 | #ifdef CONFIG_PM | |
3a3c244c | 325 | static int pciehp_suspend (struct pcie_device *dev) |
1da177e4 | 326 | { |
7f2feec1 | 327 | dev_info(&dev->device, "%s ENTRY\n", __func__); |
1da177e4 LT |
328 | return 0; |
329 | } | |
330 | ||
331 | static int pciehp_resume (struct pcie_device *dev) | |
332 | { | |
7f2feec1 | 333 | dev_info(&dev->device, "%s ENTRY\n", __func__); |
cd2fe83a | 334 | if (pciehp_force) { |
b9708940 | 335 | struct controller *ctrl = get_service_data(dev); |
8720d27d | 336 | struct slot *slot; |
cd2fe83a ML |
337 | u8 status; |
338 | ||
339 | /* reinitialize the chipset's event detection logic */ | |
c4635eb0 | 340 | pcie_enable_notification(ctrl); |
cd2fe83a | 341 | |
8720d27d | 342 | slot = ctrl->slot; |
cd2fe83a ML |
343 | |
344 | /* Check if slot is occupied */ | |
82a9e79e | 345 | pciehp_get_adapter_status(slot, &status); |
cd2fe83a | 346 | if (status) |
8720d27d | 347 | pciehp_enable_slot(slot); |
cd2fe83a | 348 | else |
8720d27d | 349 | pciehp_disable_slot(slot); |
cd2fe83a | 350 | } |
1da177e4 LT |
351 | return 0; |
352 | } | |
3a3c244c | 353 | #endif /* PM */ |
1da177e4 | 354 | |
1da177e4 | 355 | static struct pcie_port_service_driver hpdriver_portdrv = { |
83e9ad54 | 356 | .name = PCIE_MODULE_NAME, |
22106368 RW |
357 | .port_type = PCIE_ANY_PORT, |
358 | .service = PCIE_PORT_SERVICE_HP, | |
1da177e4 LT |
359 | |
360 | .probe = pciehp_probe, | |
361 | .remove = pciehp_remove, | |
362 | ||
363 | #ifdef CONFIG_PM | |
364 | .suspend = pciehp_suspend, | |
365 | .resume = pciehp_resume, | |
366 | #endif /* PM */ | |
367 | }; | |
368 | ||
369 | static int __init pcied_init(void) | |
370 | { | |
371 | int retval = 0; | |
372 | ||
c9ffa5a5 | 373 | pciehp_firmware_init(); |
a8a2be94 | 374 | retval = pcie_port_service_register(&hpdriver_portdrv); |
375 | dbg("pcie_port_service_register = %d\n", retval); | |
376 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); | |
377 | if (retval) | |
18b341b7 | 378 | dbg("Failure to register service\n"); |
1da177e4 LT |
379 | return retval; |
380 | } | |
381 | ||
382 | static void __exit pcied_cleanup(void) | |
383 | { | |
384 | dbg("unload_pciehpd()\n"); | |
1da177e4 | 385 | pcie_port_service_unregister(&hpdriver_portdrv); |
1da177e4 LT |
386 | info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); |
387 | } | |
388 | ||
389 | module_init(pcied_init); | |
390 | module_exit(pcied_cleanup); |