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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 snprintf(name, sizeof(name), "shpchp-%d", slot->number);
132 slot->wq = alloc_workqueue(name, 0, 0);
133 if (!slot->wq) {
134 retval = -ENOMEM;
135 goto error_info;
136 }
137
138 mutex_init(&slot->lock);
139 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
140
141
142 hotplug_slot->private = slot;
143 hotplug_slot->release = &release_slot;
144 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
145 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
146
147 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
148 "hp_slot=%x sun=%x slot_device_offset=%x\n",
149 pci_domain_nr(ctrl->pci_dev->subordinate),
150 slot->bus, slot->device, slot->hp_slot, slot->number,
151 ctrl->slot_device_offset);
152 retval = pci_hp_register(slot->hotplug_slot,
153 ctrl->pci_dev->subordinate, slot->device, name);
154 if (retval) {
155 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
156 retval);
157 goto error_slotwq;
158 }
159
160 get_power_status(hotplug_slot, &info->power_status);
161 get_attention_status(hotplug_slot, &info->attention_status);
162 get_latch_status(hotplug_slot, &info->latch_status);
163 get_adapter_status(hotplug_slot, &info->adapter_status);
164
165 list_add(&slot->slot_list, &ctrl->slot_list);
166 }
167
168 return 0;
169error_slotwq:
170 destroy_workqueue(slot->wq);
171error_info:
172 kfree(info);
173error_hpslot:
174 kfree(hotplug_slot);
175error_slot:
176 kfree(slot);
177error:
178 return retval;
179}
180
181void cleanup_slots(struct controller *ctrl)
182{
183 struct list_head *tmp;
184 struct list_head *next;
185 struct slot *slot;
186
187 list_for_each_safe(tmp, next, &ctrl->slot_list) {
188 slot = list_entry(tmp, struct slot, slot_list);
189 list_del(&slot->slot_list);
190 cancel_delayed_work(&slot->work);
191 destroy_workqueue(slot->wq);
192 pci_hp_deregister(slot->hotplug_slot);
193 }
194}
195
196
197
198
199static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
200{
201 struct slot *slot = get_slot(hotplug_slot);
202
203 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
204 __func__, slot_name(slot));
205
206 hotplug_slot->info->attention_status = status;
207 slot->hpc_ops->set_attention_status(slot, status);
208
209 return 0;
210}
211
212static int enable_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_enable_slot(slot);
220}
221
222static int disable_slot (struct hotplug_slot *hotplug_slot)
223{
224 struct slot *slot = get_slot(hotplug_slot);
225
226 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
227 __func__, slot_name(slot));
228
229 return shpchp_sysfs_disable_slot(slot);
230}
231
232static int get_power_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_power_status(slot, value);
241 if (retval < 0)
242 *value = hotplug_slot->info->power_status;
243
244 return 0;
245}
246
247static int get_attention_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_attention_status(slot, value);
256 if (retval < 0)
257 *value = hotplug_slot->info->attention_status;
258
259 return 0;
260}
261
262static int get_latch_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_latch_status(slot, value);
271 if (retval < 0)
272 *value = hotplug_slot->info->latch_status;
273
274 return 0;
275}
276
277static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
278{
279 struct slot *slot = get_slot(hotplug_slot);
280 int retval;
281
282 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
283 __func__, slot_name(slot));
284
285 retval = slot->hpc_ops->get_adapter_status(slot, value);
286 if (retval < 0)
287 *value = hotplug_slot->info->adapter_status;
288
289 return 0;
290}
291
292static int is_shpc_capable(struct pci_dev *dev)
293{
294 if (dev->vendor == PCI_VENDOR_ID_AMD &&
295 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
296 return 1;
297 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
298 return 0;
299 if (get_hp_hw_control_from_firmware(dev))
300 return 0;
301 return 1;
302}
303
304static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
305{
306 int rc;
307 struct controller *ctrl;
308
309 if (!is_shpc_capable(pdev))
310 return -ENODEV;
311
312 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
313 if (!ctrl) {
314 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
315 goto err_out_none;
316 }
317 INIT_LIST_HEAD(&ctrl->slot_list);
318
319 rc = shpc_init(ctrl, pdev);
320 if (rc) {
321 ctrl_dbg(ctrl, "Controller initialization failed\n");
322 goto err_out_free_ctrl;
323 }
324
325 pci_set_drvdata(pdev, ctrl);
326
327
328 rc = init_slots(ctrl);
329 if (rc) {
330 ctrl_err(ctrl, "Slot initialization failed\n");
331 goto err_out_release_ctlr;
332 }
333
334 rc = shpchp_create_ctrl_files(ctrl);
335 if (rc)
336 goto err_cleanup_slots;
337
338 return 0;
339
340err_cleanup_slots:
341 cleanup_slots(ctrl);
342err_out_release_ctlr:
343 ctrl->hpc_ops->release_ctlr(ctrl);
344err_out_free_ctrl:
345 kfree(ctrl);
346err_out_none:
347 return -ENODEV;
348}
349
350static void shpc_remove(struct pci_dev *dev)
351{
352 struct controller *ctrl = pci_get_drvdata(dev);
353
354 shpchp_remove_ctrl_files(ctrl);
355 ctrl->hpc_ops->release_ctlr(ctrl);
356 kfree(ctrl);
357}
358
359static struct pci_device_id shpcd_pci_tbl[] = {
360 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
361 { }
362};
363MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
364
365static struct pci_driver shpc_driver = {
366 .name = SHPC_MODULE_NAME,
367 .id_table = shpcd_pci_tbl,
368 .probe = shpc_probe,
369 .remove = shpc_remove,
370};
371
372static int __init shpcd_init(void)
373{
374 int retval;
375
376 retval = pci_register_driver(&shpc_driver);
377 dbg("%s: pci_register_driver = %d\n", __func__, retval);
378 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
379
380 return retval;
381}
382
383static void __exit shpcd_cleanup(void)
384{
385 dbg("unload_shpchpd()\n");
386 pci_unregister_driver(&shpc_driver);
387 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
388}
389
390module_init(shpcd_init);
391module_exit(shpcd_cleanup);
392
