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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 | ||
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); | |
2e35afae | 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 | { | |
7f2feec1 TI |
80 | struct slot *slot = hotplug_slot->private; |
81 | ||
18b341b7 | 82 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 83 | __func__, hotplug_slot_name(hotplug_slot)); |
b308240b | 84 | |
586f1d66 | 85 | kfree(hotplug_slot->ops); |
c4635eb0 KK |
86 | kfree(hotplug_slot->info); |
87 | kfree(hotplug_slot); | |
a0b17257 KK |
88 | } |
89 | ||
8720d27d | 90 | static int init_slot(struct controller *ctrl) |
1da177e4 | 91 | { |
8720d27d KK |
92 | struct slot *slot = ctrl->slot; |
93 | struct hotplug_slot *hotplug = NULL; | |
94 | struct hotplug_slot_info *info = NULL; | |
586f1d66 | 95 | struct hotplug_slot_ops *ops = NULL; |
e1acb24f | 96 | char name[SLOT_NAME_SIZE]; |
a0b17257 | 97 | int retval = -ENOMEM; |
1da177e4 | 98 | |
8720d27d KK |
99 | hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL); |
100 | if (!hotplug) | |
101 | goto out; | |
102 | ||
103 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
104 | if (!info) | |
105 | goto out; | |
106 | ||
586f1d66 KK |
107 | /* Setup hotplug slot ops */ |
108 | ops = kzalloc(sizeof(*ops), GFP_KERNEL); | |
109 | if (!ops) | |
110 | goto out; | |
111 | ops->enable_slot = enable_slot; | |
112 | ops->disable_slot = disable_slot; | |
113 | ops->get_power_status = get_power_status; | |
114 | ops->get_adapter_status = get_adapter_status; | |
2e35afae | 115 | ops->reset_slot = reset_slot; |
586f1d66 KK |
116 | if (MRL_SENS(ctrl)) |
117 | ops->get_latch_status = get_latch_status; | |
118 | if (ATTN_LED(ctrl)) { | |
119 | ops->get_attention_status = get_attention_status; | |
120 | ops->set_attention_status = set_attention_status; | |
121 | } | |
122 | ||
8720d27d KK |
123 | /* register this slot with the hotplug pci core */ |
124 | hotplug->info = info; | |
125 | hotplug->private = slot; | |
126 | hotplug->release = &release_slot; | |
586f1d66 | 127 | hotplug->ops = ops; |
8720d27d | 128 | slot->hotplug_slot = hotplug; |
07a09694 | 129 | snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl)); |
8720d27d | 130 | |
a2359a33 | 131 | ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n", |
385e2491 | 132 | pci_domain_nr(ctrl->pcie->port->subordinate), |
07a09694 | 133 | ctrl->pcie->port->subordinate->number, PSN(ctrl)); |
8720d27d | 134 | retval = pci_hp_register(hotplug, |
385e2491 | 135 | ctrl->pcie->port->subordinate, 0, name); |
445f7985 | 136 | if (retval) |
8720d27d KK |
137 | ctrl_err(ctrl, |
138 | "pci_hp_register failed with error %d\n", retval); | |
8720d27d KK |
139 | out: |
140 | if (retval) { | |
586f1d66 | 141 | kfree(ops); |
8720d27d KK |
142 | kfree(info); |
143 | kfree(hotplug); | |
1da177e4 | 144 | } |
a0b17257 | 145 | return retval; |
1da177e4 LT |
146 | } |
147 | ||
8720d27d | 148 | static void cleanup_slot(struct controller *ctrl) |
1da177e4 | 149 | { |
8720d27d | 150 | pci_hp_deregister(ctrl->slot->hotplug_slot); |
1da177e4 LT |
151 | } |
152 | ||
1da177e4 LT |
153 | /* |
154 | * set_attention_status - Turns the Amber LED for a slot on, off or blink | |
155 | */ | |
156 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
157 | { | |
158 | struct slot *slot = hotplug_slot->private; | |
159 | ||
18b341b7 | 160 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 161 | __func__, slot_name(slot)); |
1da177e4 | 162 | |
6dae6202 BH |
163 | pciehp_set_attention_status(slot, status); |
164 | return 0; | |
1da177e4 LT |
165 | } |
166 | ||
167 | ||
168 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
169 | { | |
170 | struct slot *slot = hotplug_slot->private; | |
171 | ||
18b341b7 | 172 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 173 | __func__, slot_name(slot)); |
1da177e4 | 174 | |
5d386e1a | 175 | return pciehp_sysfs_enable_slot(slot); |
1da177e4 LT |
176 | } |
177 | ||
178 | ||
179 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
180 | { | |
181 | struct slot *slot = hotplug_slot->private; | |
182 | ||
18b341b7 | 183 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 184 | __func__, slot_name(slot)); |
1da177e4 | 185 | |
5d386e1a | 186 | return pciehp_sysfs_disable_slot(slot); |
1da177e4 LT |
187 | } |
188 | ||
189 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
190 | { | |
191 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 192 | |
18b341b7 | 193 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 194 | __func__, slot_name(slot)); |
1da177e4 | 195 | |
6dae6202 BH |
196 | pciehp_get_power_status(slot, value); |
197 | return 0; | |
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 | |
6dae6202 BH |
207 | pciehp_get_attention_status(slot, value); |
208 | return 0; | |
1da177e4 LT |
209 | } |
210 | ||
211 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
212 | { | |
213 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 214 | |
18b341b7 | 215 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 216 | __func__, slot_name(slot)); |
1da177e4 | 217 | |
6dae6202 BH |
218 | pciehp_get_latch_status(slot, value); |
219 | return 0; | |
1da177e4 LT |
220 | } |
221 | ||
222 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
223 | { | |
224 | struct slot *slot = hotplug_slot->private; | |
1da177e4 | 225 | |
18b341b7 | 226 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
e1acb24f | 227 | __func__, slot_name(slot)); |
1da177e4 | 228 | |
6dae6202 BH |
229 | pciehp_get_adapter_status(slot, value); |
230 | return 0; | |
1da177e4 LT |
231 | } |
232 | ||
2e35afae AW |
233 | static int reset_slot(struct hotplug_slot *hotplug_slot, int probe) |
234 | { | |
235 | struct slot *slot = hotplug_slot->private; | |
236 | ||
237 | ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", | |
238 | __func__, slot_name(slot)); | |
239 | ||
240 | return pciehp_reset_slot(slot, probe); | |
241 | } | |
242 | ||
0516c8bc | 243 | static int pciehp_probe(struct pcie_device *dev) |
1da177e4 LT |
244 | { |
245 | int rc; | |
246 | struct controller *ctrl; | |
8720d27d | 247 | struct slot *slot; |
8792e11f | 248 | u8 occupied, poweron; |
125c39f7 KK |
249 | |
250 | if (pciehp_force) | |
7f2feec1 TI |
251 | dev_info(&dev->device, |
252 | "Bypassing BIOS check for pciehp use on %s\n", | |
8792e11f | 253 | pci_name(dev->port)); |
28eb5f27 | 254 | else if (pciehp_acpi_slot_detection_check(dev->port)) |
125c39f7 | 255 | goto err_out_none; |
a073a826 | 256 | |
c4635eb0 | 257 | ctrl = pcie_init(dev); |
1da177e4 | 258 | if (!ctrl) { |
18b341b7 | 259 | dev_err(&dev->device, "Controller initialization failed\n"); |
c4635eb0 | 260 | goto err_out_none; |
1da177e4 | 261 | } |
b9708940 | 262 | set_service_data(dev, ctrl); |
1da177e4 | 263 | |
1da177e4 | 264 | /* Setup the slot information structures */ |
8720d27d | 265 | rc = init_slot(ctrl); |
1da177e4 | 266 | if (rc) { |
f46753c5 | 267 | if (rc == -EBUSY) |
18b341b7 | 268 | ctrl_warn(ctrl, "Slot already registered by another " |
7f2feec1 | 269 | "hotplug driver\n"); |
f46753c5 | 270 | else |
18b341b7 | 271 | ctrl_err(ctrl, "Slot initialization failed\n"); |
a8c2b635 | 272 | goto err_out_release_ctlr; |
1da177e4 LT |
273 | } |
274 | ||
dbc7e1e5 EB |
275 | /* Enable events after we have setup the data structures */ |
276 | rc = pcie_init_notification(ctrl); | |
277 | if (rc) { | |
278 | ctrl_err(ctrl, "Notification initialization failed\n"); | |
65b947bc | 279 | goto err_out_free_ctrl_slot; |
dbc7e1e5 EB |
280 | } |
281 | ||
db9aaf0b | 282 | /* Check if slot is occupied */ |
8720d27d | 283 | slot = ctrl->slot; |
8792e11f KK |
284 | pciehp_get_adapter_status(slot, &occupied); |
285 | pciehp_get_power_status(slot, &poweron); | |
50b52fde RJ |
286 | if (occupied && pciehp_force) { |
287 | mutex_lock(&slot->hotplug_lock); | |
8792e11f | 288 | pciehp_enable_slot(slot); |
50b52fde RJ |
289 | mutex_unlock(&slot->hotplug_lock); |
290 | } | |
8792e11f KK |
291 | /* If empty slot's power status is on, turn power off */ |
292 | if (!occupied && poweron && POWER_CTRL(ctrl)) | |
293 | pciehp_power_off_slot(slot); | |
1da177e4 | 294 | |
1da177e4 LT |
295 | return 0; |
296 | ||
297 | err_out_free_ctrl_slot: | |
8720d27d | 298 | cleanup_slot(ctrl); |
a8c2b635 | 299 | err_out_release_ctlr: |
82a9e79e | 300 | pciehp_release_ctrl(ctrl); |
1da177e4 LT |
301 | err_out_none: |
302 | return -ENODEV; | |
303 | } | |
304 | ||
82a9e79e | 305 | static void pciehp_remove(struct pcie_device *dev) |
1da177e4 | 306 | { |
b9708940 | 307 | struct controller *ctrl = get_service_data(dev); |
1da177e4 | 308 | |
8720d27d | 309 | cleanup_slot(ctrl); |
82a9e79e | 310 | pciehp_release_ctrl(ctrl); |
1da177e4 LT |
311 | } |
312 | ||
313 | #ifdef CONFIG_PM | |
3a3c244c | 314 | static int pciehp_suspend (struct pcie_device *dev) |
1da177e4 | 315 | { |
1da177e4 LT |
316 | return 0; |
317 | } | |
318 | ||
319 | static int pciehp_resume (struct pcie_device *dev) | |
320 | { | |
87683e22 ON |
321 | struct controller *ctrl; |
322 | struct slot *slot; | |
323 | u8 status; | |
324 | ||
87683e22 | 325 | ctrl = get_service_data(dev); |
cd2fe83a | 326 | |
87683e22 ON |
327 | /* reinitialize the chipset's event detection logic */ |
328 | pcie_enable_notification(ctrl); | |
cd2fe83a | 329 | |
87683e22 | 330 | slot = ctrl->slot; |
cd2fe83a | 331 | |
87683e22 ON |
332 | /* Check if slot is occupied */ |
333 | pciehp_get_adapter_status(slot, &status); | |
50b52fde | 334 | mutex_lock(&slot->hotplug_lock); |
87683e22 ON |
335 | if (status) |
336 | pciehp_enable_slot(slot); | |
337 | else | |
338 | pciehp_disable_slot(slot); | |
50b52fde | 339 | mutex_unlock(&slot->hotplug_lock); |
1da177e4 LT |
340 | return 0; |
341 | } | |
3a3c244c | 342 | #endif /* PM */ |
1da177e4 | 343 | |
1da177e4 | 344 | static struct pcie_port_service_driver hpdriver_portdrv = { |
83e9ad54 | 345 | .name = PCIE_MODULE_NAME, |
22106368 RW |
346 | .port_type = PCIE_ANY_PORT, |
347 | .service = PCIE_PORT_SERVICE_HP, | |
1da177e4 LT |
348 | |
349 | .probe = pciehp_probe, | |
350 | .remove = pciehp_remove, | |
351 | ||
352 | #ifdef CONFIG_PM | |
353 | .suspend = pciehp_suspend, | |
354 | .resume = pciehp_resume, | |
355 | #endif /* PM */ | |
356 | }; | |
357 | ||
358 | static int __init pcied_init(void) | |
359 | { | |
360 | int retval = 0; | |
361 | ||
c9ffa5a5 | 362 | pciehp_firmware_init(); |
a8a2be94 | 363 | retval = pcie_port_service_register(&hpdriver_portdrv); |
f7625980 BH |
364 | dbg("pcie_port_service_register = %d\n", retval); |
365 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); | |
c2be6f93 | 366 | if (retval) |
18b341b7 | 367 | dbg("Failure to register service\n"); |
c2be6f93 | 368 | |
1da177e4 LT |
369 | return retval; |
370 | } | |
371 | ||
372 | static void __exit pcied_cleanup(void) | |
373 | { | |
374 | dbg("unload_pciehpd()\n"); | |
027e8d52 | 375 | pcie_port_service_unregister(&hpdriver_portdrv); |
1da177e4 LT |
376 | info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); |
377 | } | |
378 | ||
379 | module_init(pcied_init); | |
380 | module_exit(pcied_cleanup); |