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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 slot *slot, *next;
182
183 list_for_each_entry_safe(slot, next, &ctrl->slot_list, slot_list) {
184 list_del(&slot->slot_list);
185 cancel_delayed_work(&slot->work);
186 destroy_workqueue(slot->wq);
187 pci_hp_deregister(slot->hotplug_slot);
188 }
189}
190
191
192
193
194static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
195{
196 struct slot *slot = get_slot(hotplug_slot);
197
198 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
199 __func__, slot_name(slot));
200
201 hotplug_slot->info->attention_status = status;
202 slot->hpc_ops->set_attention_status(slot, status);
203
204 return 0;
205}
206
207static int enable_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_enable_slot(slot);
215}
216
217static int disable_slot(struct hotplug_slot *hotplug_slot)
218{
219 struct slot *slot = get_slot(hotplug_slot);
220
221 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
222 __func__, slot_name(slot));
223
224 return shpchp_sysfs_disable_slot(slot);
225}
226
227static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
228{
229 struct slot *slot = get_slot(hotplug_slot);
230 int retval;
231
232 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
233 __func__, slot_name(slot));
234
235 retval = slot->hpc_ops->get_power_status(slot, value);
236 if (retval < 0)
237 *value = hotplug_slot->info->power_status;
238
239 return 0;
240}
241
242static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
243{
244 struct slot *slot = get_slot(hotplug_slot);
245 int retval;
246
247 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
248 __func__, slot_name(slot));
249
250 retval = slot->hpc_ops->get_attention_status(slot, value);
251 if (retval < 0)
252 *value = hotplug_slot->info->attention_status;
253
254 return 0;
255}
256
257static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
258{
259 struct slot *slot = get_slot(hotplug_slot);
260 int retval;
261
262 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
263 __func__, slot_name(slot));
264
265 retval = slot->hpc_ops->get_latch_status(slot, value);
266 if (retval < 0)
267 *value = hotplug_slot->info->latch_status;
268
269 return 0;
270}
271
272static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
273{
274 struct slot *slot = get_slot(hotplug_slot);
275 int retval;
276
277 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
278 __func__, slot_name(slot));
279
280 retval = slot->hpc_ops->get_adapter_status(slot, value);
281 if (retval < 0)
282 *value = hotplug_slot->info->adapter_status;
283
284 return 0;
285}
286
287static bool shpc_capable(struct pci_dev *bridge)
288{
289
290
291
292
293 if (bridge->vendor == PCI_VENDOR_ID_AMD &&
294 bridge->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
295 return true;
296
297 if (pci_find_capability(bridge, PCI_CAP_ID_SHPC))
298 return true;
299
300 return false;
301}
302
303static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
304{
305 int rc;
306 struct controller *ctrl;
307
308 if (!shpc_capable(pdev))
309 return -ENODEV;
310
311 if (acpi_get_hp_hw_control_from_firmware(pdev))
312 return -ENODEV;
313
314 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
315 if (!ctrl) {
316 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
317 goto err_out_none;
318 }
319 INIT_LIST_HEAD(&ctrl->slot_list);
320
321 rc = shpc_init(ctrl, pdev);
322 if (rc) {
323 ctrl_dbg(ctrl, "Controller initialization failed\n");
324 goto err_out_free_ctrl;
325 }
326
327 pci_set_drvdata(pdev, ctrl);
328
329
330 rc = init_slots(ctrl);
331 if (rc) {
332 ctrl_err(ctrl, "Slot initialization failed\n");
333 goto err_out_release_ctlr;
334 }
335
336 rc = shpchp_create_ctrl_files(ctrl);
337 if (rc)
338 goto err_cleanup_slots;
339
340 pdev->shpc_managed = 1;
341 return 0;
342
343err_cleanup_slots:
344 cleanup_slots(ctrl);
345err_out_release_ctlr:
346 ctrl->hpc_ops->release_ctlr(ctrl);
347err_out_free_ctrl:
348 kfree(ctrl);
349err_out_none:
350 return -ENODEV;
351}
352
353static void shpc_remove(struct pci_dev *dev)
354{
355 struct controller *ctrl = pci_get_drvdata(dev);
356
357 dev->shpc_managed = 0;
358 shpchp_remove_ctrl_files(ctrl);
359 ctrl->hpc_ops->release_ctlr(ctrl);
360 kfree(ctrl);
361}
362
363static struct pci_device_id shpcd_pci_tbl[] = {
364 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
365 { }
366};
367MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
368
369static struct pci_driver shpc_driver = {
370 .name = SHPC_MODULE_NAME,
371 .id_table = shpcd_pci_tbl,
372 .probe = shpc_probe,
373 .remove = shpc_remove,
374};
375
376static int __init shpcd_init(void)
377{
378 int retval;
379
380 retval = pci_register_driver(&shpc_driver);
381 dbg("%s: pci_register_driver = %d\n", __func__, retval);
382 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
383
384 return retval;
385}
386
387static void __exit shpcd_cleanup(void)
388{
389 dbg("unload_shpchpd()\n");
390 pci_unregister_driver(&shpc_driver);
391 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
392}
393
394module_init(shpcd_init);
395module_exit(shpcd_cleanup);
396
