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/slab.h>
35 #include <linux/pci.h>
36 #include "shpchp.h"
37
38 /* Global variables */
39 bool shpchp_debug;
40 bool 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
69 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
70 .set_attention_status = set_attention_status,
71 .enable_slot = enable_slot,
72 .disable_slot = disable_slot,
73 .get_power_status = get_power_status,
74 .get_attention_status = get_attention_status,
75 .get_latch_status = get_latch_status,
76 .get_adapter_status = get_adapter_status,
77 };
78
79 /**
80 * release_slot - free up the memory used by a slot
81 * @hotplug_slot: slot to free
82 */
release_slot(struct hotplug_slot * hotplug_slot)83 static void release_slot(struct hotplug_slot *hotplug_slot)
84 {
85 struct slot *slot = hotplug_slot->private;
86
87 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
88 __func__, slot_name(slot));
89
90 kfree(slot->hotplug_slot->info);
91 kfree(slot->hotplug_slot);
92 kfree(slot);
93 }
94
init_slots(struct controller * ctrl)95 static int init_slots(struct controller *ctrl)
96 {
97 struct slot *slot;
98 struct hotplug_slot *hotplug_slot;
99 struct hotplug_slot_info *info;
100 char name[SLOT_NAME_SIZE];
101 int retval = -ENOMEM;
102 int i;
103
104 for (i = 0; i < ctrl->num_slots; i++) {
105 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
106 if (!slot)
107 goto error;
108
109 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
110 if (!hotplug_slot)
111 goto error_slot;
112 slot->hotplug_slot = hotplug_slot;
113
114 info = kzalloc(sizeof(*info), GFP_KERNEL);
115 if (!info)
116 goto error_hpslot;
117 hotplug_slot->info = info;
118
119 slot->hp_slot = i;
120 slot->ctrl = ctrl;
121 slot->bus = ctrl->pci_dev->subordinate->number;
122 slot->device = ctrl->slot_device_offset + i;
123 slot->hpc_ops = ctrl->hpc_ops;
124 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
125 mutex_init(&slot->lock);
126 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
127
128 /* register this slot with the hotplug pci core */
129 hotplug_slot->private = slot;
130 hotplug_slot->release = &release_slot;
131 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
132 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
133
134 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
135 "hp_slot=%x sun=%x slot_device_offset=%x\n",
136 pci_domain_nr(ctrl->pci_dev->subordinate),
137 slot->bus, slot->device, slot->hp_slot, slot->number,
138 ctrl->slot_device_offset);
139 retval = pci_hp_register(slot->hotplug_slot,
140 ctrl->pci_dev->subordinate, slot->device, name);
141 if (retval) {
142 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
143 retval);
144 goto error_info;
145 }
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 list_add(&slot->slot_list, &ctrl->slot_list);
153 }
154
155 return 0;
156 error_info:
157 kfree(info);
158 error_hpslot:
159 kfree(hotplug_slot);
160 error_slot:
161 kfree(slot);
162 error:
163 return retval;
164 }
165
cleanup_slots(struct controller * ctrl)166 void cleanup_slots(struct controller *ctrl)
167 {
168 struct list_head *tmp;
169 struct list_head *next;
170 struct slot *slot;
171
172 list_for_each_safe(tmp, next, &ctrl->slot_list) {
173 slot = list_entry(tmp, struct slot, slot_list);
174 list_del(&slot->slot_list);
175 cancel_delayed_work(&slot->work);
176 flush_workqueue(shpchp_wq);
177 pci_hp_deregister(slot->hotplug_slot);
178 }
179 }
180
181 /*
182 * set_attention_status - Turns the Amber LED for a slot on, off or blink
183 */
set_attention_status(struct hotplug_slot * hotplug_slot,u8 status)184 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
185 {
186 struct slot *slot = get_slot(hotplug_slot);
187
188 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
189 __func__, slot_name(slot));
190
191 hotplug_slot->info->attention_status = status;
192 slot->hpc_ops->set_attention_status(slot, status);
193
194 return 0;
195 }
196
enable_slot(struct hotplug_slot * hotplug_slot)197 static int enable_slot (struct hotplug_slot *hotplug_slot)
198 {
199 struct slot *slot = get_slot(hotplug_slot);
200
201 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
202 __func__, slot_name(slot));
203
204 return shpchp_sysfs_enable_slot(slot);
205 }
206
disable_slot(struct hotplug_slot * hotplug_slot)207 static int disable_slot (struct hotplug_slot *hotplug_slot)
208 {
209 struct slot *slot = get_slot(hotplug_slot);
210
211 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
212 __func__, slot_name(slot));
213
214 return shpchp_sysfs_disable_slot(slot);
215 }
216
get_power_status(struct hotplug_slot * hotplug_slot,u8 * value)217 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
218 {
219 struct slot *slot = get_slot(hotplug_slot);
220 int retval;
221
222 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
223 __func__, slot_name(slot));
224
225 retval = slot->hpc_ops->get_power_status(slot, value);
226 if (retval < 0)
227 *value = hotplug_slot->info->power_status;
228
229 return 0;
230 }
231
get_attention_status(struct hotplug_slot * hotplug_slot,u8 * value)232 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
233 {
234 struct slot *slot = get_slot(hotplug_slot);
235 int retval;
236
237 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
238 __func__, slot_name(slot));
239
240 retval = slot->hpc_ops->get_attention_status(slot, value);
241 if (retval < 0)
242 *value = hotplug_slot->info->attention_status;
243
244 return 0;
245 }
246
get_latch_status(struct hotplug_slot * hotplug_slot,u8 * value)247 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
248 {
249 struct slot *slot = get_slot(hotplug_slot);
250 int retval;
251
252 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
253 __func__, slot_name(slot));
254
255 retval = slot->hpc_ops->get_latch_status(slot, value);
256 if (retval < 0)
257 *value = hotplug_slot->info->latch_status;
258
259 return 0;
260 }
261
get_adapter_status(struct hotplug_slot * hotplug_slot,u8 * value)262 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
263 {
264 struct slot *slot = get_slot(hotplug_slot);
265 int retval;
266
267 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
268 __func__, slot_name(slot));
269
270 retval = slot->hpc_ops->get_adapter_status(slot, value);
271 if (retval < 0)
272 *value = hotplug_slot->info->adapter_status;
273
274 return 0;
275 }
276
is_shpc_capable(struct pci_dev * dev)277 static int is_shpc_capable(struct pci_dev *dev)
278 {
279 if (dev->vendor == PCI_VENDOR_ID_AMD &&
280 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
281 return 1;
282 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
283 return 0;
284 if (get_hp_hw_control_from_firmware(dev))
285 return 0;
286 return 1;
287 }
288
shpc_probe(struct pci_dev * pdev,const struct pci_device_id * ent)289 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
290 {
291 int rc;
292 struct controller *ctrl;
293
294 if (!is_shpc_capable(pdev))
295 return -ENODEV;
296
297 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
298 if (!ctrl) {
299 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
300 goto err_out_none;
301 }
302 INIT_LIST_HEAD(&ctrl->slot_list);
303
304 rc = shpc_init(ctrl, pdev);
305 if (rc) {
306 ctrl_dbg(ctrl, "Controller initialization failed\n");
307 goto err_out_free_ctrl;
308 }
309
310 pci_set_drvdata(pdev, ctrl);
311
312 /* Setup the slot information structures */
313 rc = init_slots(ctrl);
314 if (rc) {
315 ctrl_err(ctrl, "Slot initialization failed\n");
316 goto err_out_release_ctlr;
317 }
318
319 rc = shpchp_create_ctrl_files(ctrl);
320 if (rc)
321 goto err_cleanup_slots;
322
323 return 0;
324
325 err_cleanup_slots:
326 cleanup_slots(ctrl);
327 err_out_release_ctlr:
328 ctrl->hpc_ops->release_ctlr(ctrl);
329 err_out_free_ctrl:
330 kfree(ctrl);
331 err_out_none:
332 return -ENODEV;
333 }
334
shpc_remove(struct pci_dev * dev)335 static void shpc_remove(struct pci_dev *dev)
336 {
337 struct controller *ctrl = pci_get_drvdata(dev);
338
339 shpchp_remove_ctrl_files(ctrl);
340 ctrl->hpc_ops->release_ctlr(ctrl);
341 kfree(ctrl);
342 }
343
344 static struct pci_device_id shpcd_pci_tbl[] = {
345 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
346 { /* end: all zeroes */ }
347 };
348 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
349
350 static struct pci_driver shpc_driver = {
351 .name = SHPC_MODULE_NAME,
352 .id_table = shpcd_pci_tbl,
353 .probe = shpc_probe,
354 .remove = shpc_remove,
355 };
356
shpcd_init(void)357 static int __init shpcd_init(void)
358 {
359 int retval = 0;
360
361 shpchp_wq = alloc_ordered_workqueue("shpchp", 0);
362 if (!shpchp_wq)
363 return -ENOMEM;
364
365 retval = pci_register_driver(&shpc_driver);
366 dbg("%s: pci_register_driver = %d\n", __func__, retval);
367 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
368 if (retval) {
369 destroy_workqueue(shpchp_wq);
370 }
371 return retval;
372 }
373
shpcd_cleanup(void)374 static void __exit shpcd_cleanup(void)
375 {
376 dbg("unload_shpchpd()\n");
377 pci_unregister_driver(&shpc_driver);
378 destroy_workqueue(shpchp_wq);
379 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
380 }
381
382 module_init(shpcd_init);
383 module_exit(shpcd_cleanup);
384