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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
39int shpchp_debug;
40int shpchp_poll_mode;
41int shpchp_poll_time;
42struct 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
48MODULE_AUTHOR(DRIVER_AUTHOR);
49MODULE_DESCRIPTION(DRIVER_DESC);
50MODULE_LICENSE("GPL");
51
52module_param(shpchp_debug, bool, 0644);
53module_param(shpchp_poll_mode, bool, 0644);
54module_param(shpchp_poll_time, int, 0644);
55MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
56MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
57MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
58
59#define SHPC_MODULE_NAME "shpchp"
60
61static int set_attention_status (struct hotplug_slot *slot, u8 value);
62static int enable_slot (struct hotplug_slot *slot);
63static int disable_slot (struct hotplug_slot *slot);
64static int get_power_status (struct hotplug_slot *slot, u8 *value);
65static int get_attention_status (struct hotplug_slot *slot, u8 *value);
66static int get_latch_status (struct hotplug_slot *slot, u8 *value);
67static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
68static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
69static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
70
71static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
72 .set_attention_status = set_attention_status,
73 .enable_slot = enable_slot,
74 .disable_slot = disable_slot,
75 .get_power_status = get_power_status,
76 .get_attention_status = get_attention_status,
77 .get_latch_status = get_latch_status,
78 .get_adapter_status = get_adapter_status,
79 .get_max_bus_speed = get_max_bus_speed,
80 .get_cur_bus_speed = get_cur_bus_speed,
81};
82
83
84
85
86
87static void release_slot(struct hotplug_slot *hotplug_slot)
88{
89 struct slot *slot = hotplug_slot->private;
90
91 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
92 __func__, slot_name(slot));
93
94 kfree(slot->hotplug_slot->info);
95 kfree(slot->hotplug_slot);
96 kfree(slot);
97}
98
99static int init_slots(struct controller *ctrl)
100{
101 struct slot *slot;
102 struct hotplug_slot *hotplug_slot;
103 struct hotplug_slot_info *info;
104 char name[SLOT_NAME_SIZE];
105 int retval = -ENOMEM;
106 int i;
107
108 for (i = 0; i < ctrl->num_slots; i++) {
109 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
110 if (!slot)
111 goto error;
112
113 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
114 if (!hotplug_slot)
115 goto error_slot;
116 slot->hotplug_slot = hotplug_slot;
117
118 info = kzalloc(sizeof(*info), GFP_KERNEL);
119 if (!info)
120 goto error_hpslot;
121 hotplug_slot->info = info;
122
123 slot->hp_slot = i;
124 slot->ctrl = ctrl;
125 slot->bus = ctrl->pci_dev->subordinate->number;
126 slot->device = ctrl->slot_device_offset + i;
127 slot->hpc_ops = ctrl->hpc_ops;
128 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
129 mutex_init(&slot->lock);
130 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
131
132
133 hotplug_slot->private = slot;
134 hotplug_slot->release = &release_slot;
135 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
136 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
137
138 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
139 "hp_slot=%x sun=%x slot_device_offset=%x\n",
140 pci_domain_nr(ctrl->pci_dev->subordinate),
141 slot->bus, slot->device, slot->hp_slot, slot->number,
142 ctrl->slot_device_offset);
143 retval = pci_hp_register(slot->hotplug_slot,
144 ctrl->pci_dev->subordinate, slot->device, name);
145 if (retval) {
146 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
147 retval);
148 goto error_info;
149 }
150
151 get_power_status(hotplug_slot, &info->power_status);
152 get_attention_status(hotplug_slot, &info->attention_status);
153 get_latch_status(hotplug_slot, &info->latch_status);
154 get_adapter_status(hotplug_slot, &info->adapter_status);
155
156 list_add(&slot->slot_list, &ctrl->slot_list);
157 }
158
159 return 0;
160error_info:
161 kfree(info);
162error_hpslot:
163 kfree(hotplug_slot);
164error_slot:
165 kfree(slot);
166error:
167 return retval;
168}
169
170void cleanup_slots(struct controller *ctrl)
171{
172 struct list_head *tmp;
173 struct list_head *next;
174 struct slot *slot;
175
176 list_for_each_safe(tmp, next, &ctrl->slot_list) {
177 slot = list_entry(tmp, struct slot, slot_list);
178 list_del(&slot->slot_list);
179 cancel_delayed_work(&slot->work);
180 flush_scheduled_work();
181 flush_workqueue(shpchp_wq);
182 pci_hp_deregister(slot->hotplug_slot);
183 }
184}
185
186
187
188
189static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
190{
191 struct slot *slot = get_slot(hotplug_slot);
192
193 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
194 __func__, slot_name(slot));
195
196 hotplug_slot->info->attention_status = status;
197 slot->hpc_ops->set_attention_status(slot, status);
198
199 return 0;
200}
201
202static int enable_slot (struct hotplug_slot *hotplug_slot)
203{
204 struct slot *slot = get_slot(hotplug_slot);
205
206 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
207 __func__, slot_name(slot));
208
209 return shpchp_sysfs_enable_slot(slot);
210}
211
212static int disable_slot (struct hotplug_slot *hotplug_slot)
213{
214 struct slot *slot = get_slot(hotplug_slot);
215
216 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
217 __func__, slot_name(slot));
218
219 return shpchp_sysfs_disable_slot(slot);
220}
221
222static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
223{
224 struct slot *slot = get_slot(hotplug_slot);
225 int retval;
226
227 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
228 __func__, slot_name(slot));
229
230 retval = slot->hpc_ops->get_power_status(slot, value);
231 if (retval < 0)
232 *value = hotplug_slot->info->power_status;
233
234 return 0;
235}
236
237static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
238{
239 struct slot *slot = get_slot(hotplug_slot);
240 int retval;
241
242 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
243 __func__, slot_name(slot));
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
252static 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 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
258 __func__, slot_name(slot));
259
260 retval = slot->hpc_ops->get_latch_status(slot, value);
261 if (retval < 0)
262 *value = hotplug_slot->info->latch_status;
263
264 return 0;
265}
266
267static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
268{
269 struct slot *slot = get_slot(hotplug_slot);
270 int retval;
271
272 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
273 __func__, slot_name(slot));
274
275 retval = slot->hpc_ops->get_adapter_status(slot, value);
276 if (retval < 0)
277 *value = hotplug_slot->info->adapter_status;
278
279 return 0;
280}
281
282static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
283 enum pci_bus_speed *value)
284{
285 struct slot *slot = get_slot(hotplug_slot);
286 int retval;
287
288 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
289 __func__, slot_name(slot));
290
291 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
292 if (retval < 0)
293 *value = PCI_SPEED_UNKNOWN;
294
295 return 0;
296}
297
298static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
299{
300 struct slot *slot = get_slot(hotplug_slot);
301 int retval;
302
303 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
304 __func__, slot_name(slot));
305
306 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
307 if (retval < 0)
308 *value = PCI_SPEED_UNKNOWN;
309
310 return 0;
311}
312
313static int is_shpc_capable(struct pci_dev *dev)
314{
315 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
316 PCI_DEVICE_ID_AMD_GOLAM_7450))
317 return 1;
318 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
319 return 0;
320 if (get_hp_hw_control_from_firmware(dev))
321 return 0;
322 return 1;
323}
324
325static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
326{
327 int rc;
328 struct controller *ctrl;
329
330 if (!is_shpc_capable(pdev))
331 return -ENODEV;
332
333 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
334 if (!ctrl) {
335 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
336 goto err_out_none;
337 }
338 INIT_LIST_HEAD(&ctrl->slot_list);
339
340 rc = shpc_init(ctrl, pdev);
341 if (rc) {
342 ctrl_dbg(ctrl, "Controller initialization failed\n");
343 goto err_out_free_ctrl;
344 }
345
346 pci_set_drvdata(pdev, ctrl);
347
348
349 rc = init_slots(ctrl);
350 if (rc) {
351 ctrl_err(ctrl, "Slot initialization failed\n");
352 goto err_out_release_ctlr;
353 }
354
355 rc = shpchp_create_ctrl_files(ctrl);
356 if (rc)
357 goto err_cleanup_slots;
358
359 return 0;
360
361err_cleanup_slots:
362 cleanup_slots(ctrl);
363err_out_release_ctlr:
364 ctrl->hpc_ops->release_ctlr(ctrl);
365err_out_free_ctrl:
366 kfree(ctrl);
367err_out_none:
368 return -ENODEV;
369}
370
371static void shpc_remove(struct pci_dev *dev)
372{
373 struct controller *ctrl = pci_get_drvdata(dev);
374
375 shpchp_remove_ctrl_files(ctrl);
376 ctrl->hpc_ops->release_ctlr(ctrl);
377 kfree(ctrl);
378}
379
380static struct pci_device_id shpcd_pci_tbl[] = {
381 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
382 { }
383};
384MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
385
386static struct pci_driver shpc_driver = {
387 .name = SHPC_MODULE_NAME,
388 .id_table = shpcd_pci_tbl,
389 .probe = shpc_probe,
390 .remove = shpc_remove,
391};
392
393static int __init shpcd_init(void)
394{
395 int retval = 0;
396
397 retval = pci_register_driver(&shpc_driver);
398 dbg("%s: pci_register_driver = %d\n", __func__, retval);
399 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
400 return retval;
401}
402
403static void __exit shpcd_cleanup(void)
404{
405 dbg("unload_shpchpd()\n");
406 pci_unregister_driver(&shpc_driver);
407 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
408}
409
410module_init(shpcd_init);
411module_exit(shpcd_cleanup);
412
