1 /*
2 * Standard 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 *
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27 *
28 */
29
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/kernel.h>
33 #include <linux/types.h>
34 #include <linux/pci.h>
35 #include <linux/workqueue.h>
36 #include "shpchp.h"
37
38 /* Global variables */
39 int shpchp_debug;
40 int shpchp_poll_mode;
41 int shpchp_poll_time;
42 struct workqueue_struct *shpchp_wq;
43
44 #define DRIVER_VERSION "0.4"
45 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
46 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
47
48 MODULE_AUTHOR(DRIVER_AUTHOR);
49 MODULE_DESCRIPTION(DRIVER_DESC);
50 MODULE_LICENSE("GPL");
51
52 module_param(shpchp_debug, bool, 0644);
53 module_param(shpchp_poll_mode, bool, 0644);
54 module_param(shpchp_poll_time, int, 0644);
55 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
56 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
57 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
58
59 #define SHPC_MODULE_NAME "shpchp"
60
61 static int set_attention_status (struct hotplug_slot *slot, u8 value);
62 static int enable_slot (struct hotplug_slot *slot);
63 static int disable_slot (struct hotplug_slot *slot);
64 static int get_power_status (struct hotplug_slot *slot, u8 *value);
65 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
66 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
67 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
68 static int get_address (struct hotplug_slot *slot, u32 *value);
69 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
70 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
71
72 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
73 .owner = THIS_MODULE,
74 .set_attention_status = set_attention_status,
75 .enable_slot = enable_slot,
76 .disable_slot = disable_slot,
77 .get_power_status = get_power_status,
78 .get_attention_status = get_attention_status,
79 .get_latch_status = get_latch_status,
80 .get_adapter_status = get_adapter_status,
81 .get_address = get_address,
82 .get_max_bus_speed = get_max_bus_speed,
83 .get_cur_bus_speed = get_cur_bus_speed,
84 };
85
86 /**
87 * release_slot - free up the memory used by a slot
88 * @hotplug_slot: slot to free
89 */
90 static void release_slot(struct hotplug_slot *hotplug_slot)
91 {
92 struct slot *slot = hotplug_slot->private;
93
94 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
95
96 kfree(slot->hotplug_slot->info);
97 kfree(slot->hotplug_slot);
98 kfree(slot);
99 }
100
101 static void make_slot_name(struct slot *slot)
102 {
103 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
104 slot->bus, slot->number);
105 }
106
107 static int init_slots(struct controller *ctrl)
108 {
109 struct slot *slot;
110 struct hotplug_slot *hotplug_slot;
111 struct hotplug_slot_info *info;
112 int retval = -ENOMEM;
113 int i;
114
115 for (i = 0; i < ctrl->num_slots; i++) {
116 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
117 if (!slot)
118 goto error;
119
120 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
121 if (!hotplug_slot)
122 goto error_slot;
123 slot->hotplug_slot = hotplug_slot;
124
125 info = kzalloc(sizeof(*info), GFP_KERNEL);
126 if (!info)
127 goto error_hpslot;
128 hotplug_slot->info = info;
129
130 hotplug_slot->name = slot->name;
131
132 slot->hp_slot = i;
133 slot->ctrl = ctrl;
134 slot->bus = ctrl->pci_dev->subordinate->number;
135 slot->device = ctrl->slot_device_offset + i;
136 slot->hpc_ops = ctrl->hpc_ops;
137 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
138 mutex_init(&slot->lock);
139 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
140
141 /* register this slot with the hotplug pci core */
142 hotplug_slot->private = slot;
143 hotplug_slot->release = &release_slot;
144 make_slot_name(slot);
145 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
146
147 get_power_status(hotplug_slot, &info->power_status);
148 get_attention_status(hotplug_slot, &info->attention_status);
149 get_latch_status(hotplug_slot, &info->latch_status);
150 get_adapter_status(hotplug_slot, &info->adapter_status);
151
152 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
153 "slot_device_offset=%x\n", slot->bus, slot->device,
154 slot->hp_slot, slot->number, ctrl->slot_device_offset);
155 retval = pci_hp_register(slot->hotplug_slot);
156 if (retval) {
157 err("pci_hp_register failed with error %d\n", retval);
158 goto error_info;
159 }
160
161 list_add(&slot->slot_list, &ctrl->slot_list);
162 }
163
164 return 0;
165 error_info:
166 kfree(info);
167 error_hpslot:
168 kfree(hotplug_slot);
169 error_slot:
170 kfree(slot);
171 error:
172 return retval;
173 }
174
175 void cleanup_slots(struct controller *ctrl)
176 {
177 struct list_head *tmp;
178 struct list_head *next;
179 struct slot *slot;
180
181 list_for_each_safe(tmp, next, &ctrl->slot_list) {
182 slot = list_entry(tmp, struct slot, slot_list);
183 list_del(&slot->slot_list);
184 cancel_delayed_work(&slot->work);
185 flush_scheduled_work();
186 flush_workqueue(shpchp_wq);
187 pci_hp_deregister(slot->hotplug_slot);
188 }
189 }
190
191 /*
192 * set_attention_status - Turns the Amber LED for a slot on, off or blink
193 */
194 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
195 {
196 struct slot *slot = get_slot(hotplug_slot);
197
198 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
199
200 hotplug_slot->info->attention_status = status;
201 slot->hpc_ops->set_attention_status(slot, status);
202
203 return 0;
204 }
205
206 static int enable_slot (struct hotplug_slot *hotplug_slot)
207 {
208 struct slot *slot = get_slot(hotplug_slot);
209
210 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
211
212 return shpchp_sysfs_enable_slot(slot);
213 }
214
215 static int disable_slot (struct hotplug_slot *hotplug_slot)
216 {
217 struct slot *slot = get_slot(hotplug_slot);
218
219 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
220
221 return shpchp_sysfs_disable_slot(slot);
222 }
223
224 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
225 {
226 struct slot *slot = get_slot(hotplug_slot);
227 int retval;
228
229 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
230
231 retval = slot->hpc_ops->get_power_status(slot, value);
232 if (retval < 0)
233 *value = hotplug_slot->info->power_status;
234
235 return 0;
236 }
237
238 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
239 {
240 struct slot *slot = get_slot(hotplug_slot);
241 int retval;
242
243 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
244
245 retval = slot->hpc_ops->get_attention_status(slot, value);
246 if (retval < 0)
247 *value = hotplug_slot->info->attention_status;
248
249 return 0;
250 }
251
252 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
253 {
254 struct slot *slot = get_slot(hotplug_slot);
255 int retval;
256
257 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
258
259 retval = slot->hpc_ops->get_latch_status(slot, value);
260 if (retval < 0)
261 *value = hotplug_slot->info->latch_status;
262
263 return 0;
264 }
265
266 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
267 {
268 struct slot *slot = get_slot(hotplug_slot);
269 int retval;
270
271 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
272
273 retval = slot->hpc_ops->get_adapter_status(slot, value);
274 if (retval < 0)
275 *value = hotplug_slot->info->adapter_status;
276
277 return 0;
278 }
279
280 static int get_address (struct hotplug_slot *hotplug_slot, u32 *value)
281 {
282 struct slot *slot = get_slot(hotplug_slot);
283 struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
284
285 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
286
287 *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
288
289 return 0;
290 }
291
292 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
293 {
294 struct slot *slot = get_slot(hotplug_slot);
295 int retval;
296
297 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
298
299 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
300 if (retval < 0)
301 *value = PCI_SPEED_UNKNOWN;
302
303 return 0;
304 }
305
306 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
307 {
308 struct slot *slot = get_slot(hotplug_slot);
309 int retval;
310
311 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
312
313 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
314 if (retval < 0)
315 *value = PCI_SPEED_UNKNOWN;
316
317 return 0;
318 }
319
320 static int is_shpc_capable(struct pci_dev *dev)
321 {
322 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
323 PCI_DEVICE_ID_AMD_GOLAM_7450))
324 return 1;
325 if (pci_find_capability(dev, PCI_CAP_ID_SHPC))
326 return 1;
327
328 return 0;
329 }
330
331 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
332 {
333 int rc;
334 struct controller *ctrl;
335
336 if (!is_shpc_capable(pdev))
337 return -ENODEV;
338
339 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
340 if (!ctrl) {
341 err("%s : out of memory\n", __FUNCTION__);
342 goto err_out_none;
343 }
344 INIT_LIST_HEAD(&ctrl->slot_list);
345
346 rc = shpc_init(ctrl, pdev);
347 if (rc) {
348 dbg("%s: controller initialization failed\n",
349 SHPC_MODULE_NAME);
350 goto err_out_free_ctrl;
351 }
352
353 pci_set_drvdata(pdev, ctrl);
354
355 /* Setup the slot information structures */
356 rc = init_slots(ctrl);
357 if (rc) {
358 err("%s: slot initialization failed\n", SHPC_MODULE_NAME);
359 goto err_out_release_ctlr;
360 }
361
362 rc = shpchp_create_ctrl_files(ctrl);
363 if (rc)
364 goto err_cleanup_slots;
365
366 return 0;
367
368 err_cleanup_slots:
369 cleanup_slots(ctrl);
370 err_out_release_ctlr:
371 ctrl->hpc_ops->release_ctlr(ctrl);
372 err_out_free_ctrl:
373 kfree(ctrl);
374 err_out_none:
375 return -ENODEV;
376 }
377
378 static void shpc_remove(struct pci_dev *dev)
379 {
380 struct controller *ctrl = pci_get_drvdata(dev);
381
382 shpchp_remove_ctrl_files(ctrl);
383 ctrl->hpc_ops->release_ctlr(ctrl);
384 kfree(ctrl);
385 }
386
387 static struct pci_device_id shpcd_pci_tbl[] = {
388 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
389 { /* end: all zeroes */ }
390 };
391 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
392
393 static struct pci_driver shpc_driver = {
394 .name = SHPC_MODULE_NAME,
395 .id_table = shpcd_pci_tbl,
396 .probe = shpc_probe,
397 .remove = shpc_remove,
398 };
399
400 static int __init shpcd_init(void)
401 {
402 int retval = 0;
403
404 retval = pci_register_driver(&shpc_driver);
405 dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
406 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
407 return retval;
408 }
409
410 static void __exit shpcd_cleanup(void)
411 {
412 dbg("unload_shpchpd()\n");
413 pci_unregister_driver(&shpc_driver);
414 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
415 }
416
417 module_init(shpcd_init);
418 module_exit(shpcd_cleanup);
419
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