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
43 #define DRIVER_VERSION "0.4"
44 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
45 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
46
47 MODULE_AUTHOR(DRIVER_AUTHOR);
48 MODULE_DESCRIPTION(DRIVER_DESC);
49 MODULE_LICENSE("GPL");
50
51 module_param(shpchp_debug, bool, 0644);
52 module_param(shpchp_poll_mode, bool, 0644);
53 module_param(shpchp_poll_time, int, 0644);
54 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
55 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
56 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
57
58 #define SHPC_MODULE_NAME "shpchp"
59
60 static int set_attention_status (struct hotplug_slot *slot, u8 value);
61 static int enable_slot (struct hotplug_slot *slot);
62 static int disable_slot (struct hotplug_slot *slot);
63 static int get_power_status (struct hotplug_slot *slot, u8 *value);
64 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
65 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
66 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
67
68 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
69 .set_attention_status = set_attention_status,
70 .enable_slot = enable_slot,
71 .disable_slot = disable_slot,
72 .get_power_status = get_power_status,
73 .get_attention_status = get_attention_status,
74 .get_latch_status = get_latch_status,
75 .get_adapter_status = get_adapter_status,
76 };
77
78 /**
79 * release_slot - free up the memory used by a slot
80 * @hotplug_slot: slot to free
81 */
release_slot(struct hotplug_slot * hotplug_slot)82 static void release_slot(struct hotplug_slot *hotplug_slot)
83 {
84 struct slot *slot = hotplug_slot->private;
85
86 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
87 __func__, slot_name(slot));
88
89 kfree(slot->hotplug_slot->info);
90 kfree(slot->hotplug_slot);
91 kfree(slot);
92 }
93
init_slots(struct controller * ctrl)94 static int init_slots(struct controller *ctrl)
95 {
96 struct slot *slot;
97 struct hotplug_slot *hotplug_slot;
98 struct hotplug_slot_info *info;
99 char name[SLOT_NAME_SIZE];
100 int retval = -ENOMEM;
101 int i;
102
103 for (i = 0; i < ctrl->num_slots; i++) {
104 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
105 if (!slot)
106 goto error;
107
108 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
109 if (!hotplug_slot)
110 goto error_slot;
111 slot->hotplug_slot = hotplug_slot;
112
113 info = kzalloc(sizeof(*info), GFP_KERNEL);
114 if (!info)
115 goto error_hpslot;
116 hotplug_slot->info = info;
117
118 slot->hp_slot = i;
119 slot->ctrl = ctrl;
120 slot->bus = ctrl->pci_dev->subordinate->number;
121 slot->device = ctrl->slot_device_offset + i;
122 slot->hpc_ops = ctrl->hpc_ops;
123 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
124
125 snprintf(name, sizeof(name), "shpchp-%d", slot->number);
126 slot->wq = alloc_workqueue(name, 0, 0);
127 if (!slot->wq) {
128 retval = -ENOMEM;
129 goto error_info;
130 }
131
132 mutex_init(&slot->lock);
133 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
134
135 /* register this slot with the hotplug pci core */
136 hotplug_slot->private = slot;
137 hotplug_slot->release = &release_slot;
138 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
139 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
140
141 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
142 "hp_slot=%x sun=%x slot_device_offset=%x\n",
143 pci_domain_nr(ctrl->pci_dev->subordinate),
144 slot->bus, slot->device, slot->hp_slot, slot->number,
145 ctrl->slot_device_offset);
146 retval = pci_hp_register(slot->hotplug_slot,
147 ctrl->pci_dev->subordinate, slot->device, name);
148 if (retval) {
149 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
150 retval);
151 goto error_slotwq;
152 }
153
154 get_power_status(hotplug_slot, &info->power_status);
155 get_attention_status(hotplug_slot, &info->attention_status);
156 get_latch_status(hotplug_slot, &info->latch_status);
157 get_adapter_status(hotplug_slot, &info->adapter_status);
158
159 list_add(&slot->slot_list, &ctrl->slot_list);
160 }
161
162 return 0;
163 error_slotwq:
164 destroy_workqueue(slot->wq);
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
cleanup_slots(struct controller * ctrl)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 destroy_workqueue(slot->wq);
186 pci_hp_deregister(slot->hotplug_slot);
187 }
188 }
189
190 /*
191 * set_attention_status - Turns the Amber LED for a slot on, off or blink
192 */
set_attention_status(struct hotplug_slot * hotplug_slot,u8 status)193 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
194 {
195 struct slot *slot = get_slot(hotplug_slot);
196
197 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
198 __func__, slot_name(slot));
199
200 hotplug_slot->info->attention_status = status;
201 slot->hpc_ops->set_attention_status(slot, status);
202
203 return 0;
204 }
205
enable_slot(struct hotplug_slot * hotplug_slot)206 static int enable_slot (struct hotplug_slot *hotplug_slot)
207 {
208 struct slot *slot = get_slot(hotplug_slot);
209
210 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
211 __func__, slot_name(slot));
212
213 return shpchp_sysfs_enable_slot(slot);
214 }
215
disable_slot(struct hotplug_slot * hotplug_slot)216 static int disable_slot (struct hotplug_slot *hotplug_slot)
217 {
218 struct slot *slot = get_slot(hotplug_slot);
219
220 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
221 __func__, slot_name(slot));
222
223 return shpchp_sysfs_disable_slot(slot);
224 }
225
get_power_status(struct hotplug_slot * hotplug_slot,u8 * value)226 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
227 {
228 struct slot *slot = get_slot(hotplug_slot);
229 int retval;
230
231 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
232 __func__, slot_name(slot));
233
234 retval = slot->hpc_ops->get_power_status(slot, value);
235 if (retval < 0)
236 *value = hotplug_slot->info->power_status;
237
238 return 0;
239 }
240
get_attention_status(struct hotplug_slot * hotplug_slot,u8 * value)241 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
242 {
243 struct slot *slot = get_slot(hotplug_slot);
244 int retval;
245
246 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
247 __func__, slot_name(slot));
248
249 retval = slot->hpc_ops->get_attention_status(slot, value);
250 if (retval < 0)
251 *value = hotplug_slot->info->attention_status;
252
253 return 0;
254 }
255
get_latch_status(struct hotplug_slot * hotplug_slot,u8 * value)256 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
257 {
258 struct slot *slot = get_slot(hotplug_slot);
259 int retval;
260
261 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
262 __func__, slot_name(slot));
263
264 retval = slot->hpc_ops->get_latch_status(slot, value);
265 if (retval < 0)
266 *value = hotplug_slot->info->latch_status;
267
268 return 0;
269 }
270
get_adapter_status(struct hotplug_slot * hotplug_slot,u8 * value)271 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
272 {
273 struct slot *slot = get_slot(hotplug_slot);
274 int retval;
275
276 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
277 __func__, slot_name(slot));
278
279 retval = slot->hpc_ops->get_adapter_status(slot, value);
280 if (retval < 0)
281 *value = hotplug_slot->info->adapter_status;
282
283 return 0;
284 }
285
is_shpc_capable(struct pci_dev * dev)286 static int is_shpc_capable(struct pci_dev *dev)
287 {
288 if (dev->vendor == PCI_VENDOR_ID_AMD &&
289 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
290 return 1;
291 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
292 return 0;
293 if (get_hp_hw_control_from_firmware(dev))
294 return 0;
295 return 1;
296 }
297
shpc_probe(struct pci_dev * pdev,const struct pci_device_id * ent)298 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
299 {
300 int rc;
301 struct controller *ctrl;
302
303 if (!is_shpc_capable(pdev))
304 return -ENODEV;
305
306 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
307 if (!ctrl) {
308 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
309 goto err_out_none;
310 }
311 INIT_LIST_HEAD(&ctrl->slot_list);
312
313 rc = shpc_init(ctrl, pdev);
314 if (rc) {
315 ctrl_dbg(ctrl, "Controller initialization failed\n");
316 goto err_out_free_ctrl;
317 }
318
319 pci_set_drvdata(pdev, ctrl);
320
321 /* Setup the slot information structures */
322 rc = init_slots(ctrl);
323 if (rc) {
324 ctrl_err(ctrl, "Slot initialization failed\n");
325 goto err_out_release_ctlr;
326 }
327
328 rc = shpchp_create_ctrl_files(ctrl);
329 if (rc)
330 goto err_cleanup_slots;
331
332 return 0;
333
334 err_cleanup_slots:
335 cleanup_slots(ctrl);
336 err_out_release_ctlr:
337 ctrl->hpc_ops->release_ctlr(ctrl);
338 err_out_free_ctrl:
339 kfree(ctrl);
340 err_out_none:
341 return -ENODEV;
342 }
343
shpc_remove(struct pci_dev * dev)344 static void shpc_remove(struct pci_dev *dev)
345 {
346 struct controller *ctrl = pci_get_drvdata(dev);
347
348 shpchp_remove_ctrl_files(ctrl);
349 ctrl->hpc_ops->release_ctlr(ctrl);
350 kfree(ctrl);
351 }
352
353 static struct pci_device_id shpcd_pci_tbl[] = {
354 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
355 { /* end: all zeroes */ }
356 };
357 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
358
359 static struct pci_driver shpc_driver = {
360 .name = SHPC_MODULE_NAME,
361 .id_table = shpcd_pci_tbl,
362 .probe = shpc_probe,
363 .remove = shpc_remove,
364 };
365
shpcd_init(void)366 static int __init shpcd_init(void)
367 {
368 int retval;
369
370 retval = pci_register_driver(&shpc_driver);
371 dbg("%s: pci_register_driver = %d\n", __func__, retval);
372 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
373
374 return retval;
375 }
376
shpcd_cleanup(void)377 static void __exit shpcd_cleanup(void)
378 {
379 dbg("unload_shpchpd()\n");
380 pci_unregister_driver(&shpc_driver);
381 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
382 }
383
384 module_init(shpcd_init);
385 module_exit(shpcd_cleanup);
386