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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/slab.h>
35#include <linux/pci.h>
36#include "shpchp.h"
37
38
39bool shpchp_debug;
40bool shpchp_poll_mode;
41int 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
47MODULE_AUTHOR(DRIVER_AUTHOR);
48MODULE_DESCRIPTION(DRIVER_DESC);
49MODULE_LICENSE("GPL");
50
51module_param(shpchp_debug, bool, 0644);
52module_param(shpchp_poll_mode, bool, 0644);
53module_param(shpchp_poll_time, int, 0644);
54MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
55MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
56MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
57
58#define SHPC_MODULE_NAME "shpchp"
59
60static int set_attention_status(struct hotplug_slot *slot, u8 value);
61static int enable_slot(struct hotplug_slot *slot);
62static int disable_slot(struct hotplug_slot *slot);
63static int get_power_status(struct hotplug_slot *slot, u8 *value);
64static int get_attention_status(struct hotplug_slot *slot, u8 *value);
65static int get_latch_status(struct hotplug_slot *slot, u8 *value);
66static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
67
68static 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
80
81
82static 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
94static 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;
101 int i;
102
103 for (i = 0; i < ctrl->num_slots; i++) {
104 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
105 if (!slot) {
106 retval = -ENOMEM;
107 goto error;
108 }
109
110 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
111 if (!hotplug_slot) {
112 retval = -ENOMEM;
113 goto error_slot;
114 }
115 slot->hotplug_slot = hotplug_slot;
116
117 info = kzalloc(sizeof(*info), GFP_KERNEL);
118 if (!info) {
119 retval = -ENOMEM;
120 goto error_hpslot;
121 }
122 hotplug_slot->info = info;
123
124 slot->hp_slot = i;
125 slot->ctrl = ctrl;
126 slot->bus = ctrl->pci_dev->subordinate->number;
127 slot->device = ctrl->slot_device_offset + i;
128 slot->hpc_ops = ctrl->hpc_ops;
129 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
130
131 slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number);
132 if (!slot->wq) {
133 retval = -ENOMEM;
134 goto error_info;
135 }
136
137 mutex_init(&slot->lock);
138 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
139
140
141 hotplug_slot->private = slot;
142 hotplug_slot->release = &release_slot;
143 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
144 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
145
146 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x hp_slot=%x sun=%x slot_device_offset=%x\n",
147 pci_domain_nr(ctrl->pci_dev->subordinate),
148 slot->bus, slot->device, slot->hp_slot, slot->number,
149 ctrl->slot_device_offset);
150 retval = pci_hp_register(slot->hotplug_slot,
151 ctrl->pci_dev->subordinate, slot->device, name);
152 if (retval) {
153 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
154 retval);
155 goto error_slotwq;
156 }
157
158 get_power_status(hotplug_slot, &info->power_status);
159 get_attention_status(hotplug_slot, &info->attention_status);
160 get_latch_status(hotplug_slot, &info->latch_status);
161 get_adapter_status(hotplug_slot, &info->adapter_status);
162
163 list_add(&slot->slot_list, &ctrl->slot_list);
164 }
165
166 return 0;
167error_slotwq:
168 destroy_workqueue(slot->wq);
169error_info:
170 kfree(info);
171error_hpslot:
172 kfree(hotplug_slot);
173error_slot:
174 kfree(slot);
175error:
176 return retval;
177}
178
179void cleanup_slots(struct controller *ctrl)
180{
181 struct list_head *tmp;
182 struct list_head *next;
183 struct slot *slot;
184
185 list_for_each_safe(tmp, next, &ctrl->slot_list) {
186 slot = list_entry(tmp, struct slot, slot_list);
187 list_del(&slot->slot_list);
188 cancel_delayed_work(&slot->work);
189 destroy_workqueue(slot->wq);
190 pci_hp_deregister(slot->hotplug_slot);
191 }
192}
193
194
195
196
197static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
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 hotplug_slot->info->attention_status = status;
205 slot->hpc_ops->set_attention_status(slot, status);
206
207 return 0;
208}
209
210static int enable_slot(struct hotplug_slot *hotplug_slot)
211{
212 struct slot *slot = get_slot(hotplug_slot);
213
214 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
215 __func__, slot_name(slot));
216
217 return shpchp_sysfs_enable_slot(slot);
218}
219
220static int disable_slot(struct hotplug_slot *hotplug_slot)
221{
222 struct slot *slot = get_slot(hotplug_slot);
223
224 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
225 __func__, slot_name(slot));
226
227 return shpchp_sysfs_disable_slot(slot);
228}
229
230static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
231{
232 struct slot *slot = get_slot(hotplug_slot);
233 int retval;
234
235 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
236 __func__, slot_name(slot));
237
238 retval = slot->hpc_ops->get_power_status(slot, value);
239 if (retval < 0)
240 *value = hotplug_slot->info->power_status;
241
242 return 0;
243}
244
245static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
246{
247 struct slot *slot = get_slot(hotplug_slot);
248 int retval;
249
250 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
251 __func__, slot_name(slot));
252
253 retval = slot->hpc_ops->get_attention_status(slot, value);
254 if (retval < 0)
255 *value = hotplug_slot->info->attention_status;
256
257 return 0;
258}
259
260static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
261{
262 struct slot *slot = get_slot(hotplug_slot);
263 int retval;
264
265 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
266 __func__, slot_name(slot));
267
268 retval = slot->hpc_ops->get_latch_status(slot, value);
269 if (retval < 0)
270 *value = hotplug_slot->info->latch_status;
271
272 return 0;
273}
274
275static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
276{
277 struct slot *slot = get_slot(hotplug_slot);
278 int retval;
279
280 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
281 __func__, slot_name(slot));
282
283 retval = slot->hpc_ops->get_adapter_status(slot, value);
284 if (retval < 0)
285 *value = hotplug_slot->info->adapter_status;
286
287 return 0;
288}
289
290static int is_shpc_capable(struct pci_dev *dev)
291{
292 if (dev->vendor == PCI_VENDOR_ID_AMD &&
293 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
294 return 1;
295 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
296 return 0;
297 if (get_hp_hw_control_from_firmware(dev))
298 return 0;
299 return 1;
300}
301
302static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
303{
304 int rc;
305 struct controller *ctrl;
306
307 if (!is_shpc_capable(pdev))
308 return -ENODEV;
309
310 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
311 if (!ctrl) {
312 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
313 goto err_out_none;
314 }
315 INIT_LIST_HEAD(&ctrl->slot_list);
316
317 rc = shpc_init(ctrl, pdev);
318 if (rc) {
319 ctrl_dbg(ctrl, "Controller initialization failed\n");
320 goto err_out_free_ctrl;
321 }
322
323 pci_set_drvdata(pdev, ctrl);
324
325
326 rc = init_slots(ctrl);
327 if (rc) {
328 ctrl_err(ctrl, "Slot initialization failed\n");
329 goto err_out_release_ctlr;
330 }
331
332 rc = shpchp_create_ctrl_files(ctrl);
333 if (rc)
334 goto err_cleanup_slots;
335
336 return 0;
337
338err_cleanup_slots:
339 cleanup_slots(ctrl);
340err_out_release_ctlr:
341 ctrl->hpc_ops->release_ctlr(ctrl);
342err_out_free_ctrl:
343 kfree(ctrl);
344err_out_none:
345 return -ENODEV;
346}
347
348static void shpc_remove(struct pci_dev *dev)
349{
350 struct controller *ctrl = pci_get_drvdata(dev);
351
352 shpchp_remove_ctrl_files(ctrl);
353 ctrl->hpc_ops->release_ctlr(ctrl);
354 kfree(ctrl);
355}
356
357static struct pci_device_id shpcd_pci_tbl[] = {
358 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
359 { }
360};
361MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
362
363static struct pci_driver shpc_driver = {
364 .name = SHPC_MODULE_NAME,
365 .id_table = shpcd_pci_tbl,
366 .probe = shpc_probe,
367 .remove = shpc_remove,
368};
369
370static int __init shpcd_init(void)
371{
372 int retval;
373
374 retval = pci_register_driver(&shpc_driver);
375 dbg("%s: pci_register_driver = %d\n", __func__, retval);
376 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
377
378 return retval;
379}
380
381static void __exit shpcd_cleanup(void)
382{
383 dbg("unload_shpchpd()\n");
384 pci_unregister_driver(&shpc_driver);
385 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
386}
387
388module_init(shpcd_init);
389module_exit(shpcd_cleanup);
390
