1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/kernel.h>
19#include <linux/types.h>
20#include <linux/slab.h>
21#include <linux/pci.h>
22#include "shpchp.h"
23
24
25bool shpchp_debug;
26bool shpchp_poll_mode;
27int shpchp_poll_time;
28
29#define DRIVER_VERSION "0.4"
30#define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
31#define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
32
33MODULE_AUTHOR(DRIVER_AUTHOR);
34MODULE_DESCRIPTION(DRIVER_DESC);
35MODULE_LICENSE("GPL");
36
37module_param(shpchp_debug, bool, 0644);
38module_param(shpchp_poll_mode, bool, 0644);
39module_param(shpchp_poll_time, int, 0644);
40MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
41MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
42MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
43
44#define SHPC_MODULE_NAME "shpchp"
45
46static int set_attention_status(struct hotplug_slot *slot, u8 value);
47static int enable_slot(struct hotplug_slot *slot);
48static int disable_slot(struct hotplug_slot *slot);
49static int get_power_status(struct hotplug_slot *slot, u8 *value);
50static int get_attention_status(struct hotplug_slot *slot, u8 *value);
51static int get_latch_status(struct hotplug_slot *slot, u8 *value);
52static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
53
54static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
55 .set_attention_status = set_attention_status,
56 .enable_slot = enable_slot,
57 .disable_slot = disable_slot,
58 .get_power_status = get_power_status,
59 .get_attention_status = get_attention_status,
60 .get_latch_status = get_latch_status,
61 .get_adapter_status = get_adapter_status,
62};
63
64static int init_slots(struct controller *ctrl)
65{
66 struct slot *slot;
67 struct hotplug_slot *hotplug_slot;
68 struct hotplug_slot_info *info;
69 char name[SLOT_NAME_SIZE];
70 int retval;
71 int i;
72
73 for (i = 0; i < ctrl->num_slots; i++) {
74 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
75 if (!slot) {
76 retval = -ENOMEM;
77 goto error;
78 }
79
80 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
81 if (!hotplug_slot) {
82 retval = -ENOMEM;
83 goto error_slot;
84 }
85 slot->hotplug_slot = hotplug_slot;
86
87 info = kzalloc(sizeof(*info), GFP_KERNEL);
88 if (!info) {
89 retval = -ENOMEM;
90 goto error_hpslot;
91 }
92 hotplug_slot->info = info;
93
94 slot->hp_slot = i;
95 slot->ctrl = ctrl;
96 slot->bus = ctrl->pci_dev->subordinate->number;
97 slot->device = ctrl->slot_device_offset + i;
98 slot->hpc_ops = ctrl->hpc_ops;
99 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
100
101 slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number);
102 if (!slot->wq) {
103 retval = -ENOMEM;
104 goto error_info;
105 }
106
107 mutex_init(&slot->lock);
108 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
109
110
111 hotplug_slot->private = slot;
112 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
113 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
114
115 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x hp_slot=%x sun=%x slot_device_offset=%x\n",
116 pci_domain_nr(ctrl->pci_dev->subordinate),
117 slot->bus, slot->device, slot->hp_slot, slot->number,
118 ctrl->slot_device_offset);
119 retval = pci_hp_register(slot->hotplug_slot,
120 ctrl->pci_dev->subordinate, slot->device, name);
121 if (retval) {
122 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
123 retval);
124 goto error_slotwq;
125 }
126
127 get_power_status(hotplug_slot, &info->power_status);
128 get_attention_status(hotplug_slot, &info->attention_status);
129 get_latch_status(hotplug_slot, &info->latch_status);
130 get_adapter_status(hotplug_slot, &info->adapter_status);
131
132 list_add(&slot->slot_list, &ctrl->slot_list);
133 }
134
135 return 0;
136error_slotwq:
137 destroy_workqueue(slot->wq);
138error_info:
139 kfree(info);
140error_hpslot:
141 kfree(hotplug_slot);
142error_slot:
143 kfree(slot);
144error:
145 return retval;
146}
147
148void cleanup_slots(struct controller *ctrl)
149{
150 struct slot *slot, *next;
151
152 list_for_each_entry_safe(slot, next, &ctrl->slot_list, slot_list) {
153 list_del(&slot->slot_list);
154 cancel_delayed_work(&slot->work);
155 destroy_workqueue(slot->wq);
156 pci_hp_deregister(slot->hotplug_slot);
157 kfree(slot->hotplug_slot->info);
158 kfree(slot->hotplug_slot);
159 kfree(slot);
160 }
161}
162
163
164
165
166static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
167{
168 struct slot *slot = get_slot(hotplug_slot);
169
170 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
171 __func__, slot_name(slot));
172
173 hotplug_slot->info->attention_status = status;
174 slot->hpc_ops->set_attention_status(slot, status);
175
176 return 0;
177}
178
179static int enable_slot(struct hotplug_slot *hotplug_slot)
180{
181 struct slot *slot = get_slot(hotplug_slot);
182
183 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
184 __func__, slot_name(slot));
185
186 return shpchp_sysfs_enable_slot(slot);
187}
188
189static int disable_slot(struct hotplug_slot *hotplug_slot)
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 return shpchp_sysfs_disable_slot(slot);
197}
198
199static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
200{
201 struct slot *slot = get_slot(hotplug_slot);
202 int retval;
203
204 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
205 __func__, slot_name(slot));
206
207 retval = slot->hpc_ops->get_power_status(slot, value);
208 if (retval < 0)
209 *value = hotplug_slot->info->power_status;
210
211 return 0;
212}
213
214static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
215{
216 struct slot *slot = get_slot(hotplug_slot);
217 int retval;
218
219 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
220 __func__, slot_name(slot));
221
222 retval = slot->hpc_ops->get_attention_status(slot, value);
223 if (retval < 0)
224 *value = hotplug_slot->info->attention_status;
225
226 return 0;
227}
228
229static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
230{
231 struct slot *slot = get_slot(hotplug_slot);
232 int retval;
233
234 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
235 __func__, slot_name(slot));
236
237 retval = slot->hpc_ops->get_latch_status(slot, value);
238 if (retval < 0)
239 *value = hotplug_slot->info->latch_status;
240
241 return 0;
242}
243
244static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
245{
246 struct slot *slot = get_slot(hotplug_slot);
247 int retval;
248
249 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
250 __func__, slot_name(slot));
251
252 retval = slot->hpc_ops->get_adapter_status(slot, value);
253 if (retval < 0)
254 *value = hotplug_slot->info->adapter_status;
255
256 return 0;
257}
258
259static bool shpc_capable(struct pci_dev *bridge)
260{
261
262
263
264
265 if (bridge->vendor == PCI_VENDOR_ID_AMD &&
266 bridge->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
267 return true;
268
269 if (pci_find_capability(bridge, PCI_CAP_ID_SHPC))
270 return true;
271
272 return false;
273}
274
275static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
276{
277 int rc;
278 struct controller *ctrl;
279
280 if (!shpc_capable(pdev))
281 return -ENODEV;
282
283 if (acpi_get_hp_hw_control_from_firmware(pdev))
284 return -ENODEV;
285
286 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
287 if (!ctrl)
288 goto err_out_none;
289
290 INIT_LIST_HEAD(&ctrl->slot_list);
291
292 rc = shpc_init(ctrl, pdev);
293 if (rc) {
294 ctrl_dbg(ctrl, "Controller initialization failed\n");
295 goto err_out_free_ctrl;
296 }
297
298 pci_set_drvdata(pdev, ctrl);
299
300
301 rc = init_slots(ctrl);
302 if (rc) {
303 ctrl_err(ctrl, "Slot initialization failed\n");
304 goto err_out_release_ctlr;
305 }
306
307 rc = shpchp_create_ctrl_files(ctrl);
308 if (rc)
309 goto err_cleanup_slots;
310
311 pdev->shpc_managed = 1;
312 return 0;
313
314err_cleanup_slots:
315 cleanup_slots(ctrl);
316err_out_release_ctlr:
317 ctrl->hpc_ops->release_ctlr(ctrl);
318err_out_free_ctrl:
319 kfree(ctrl);
320err_out_none:
321 return -ENODEV;
322}
323
324static void shpc_remove(struct pci_dev *dev)
325{
326 struct controller *ctrl = pci_get_drvdata(dev);
327
328 dev->shpc_managed = 0;
329 shpchp_remove_ctrl_files(ctrl);
330 ctrl->hpc_ops->release_ctlr(ctrl);
331 kfree(ctrl);
332}
333
334static const struct pci_device_id shpcd_pci_tbl[] = {
335 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
336 { }
337};
338MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
339
340static struct pci_driver shpc_driver = {
341 .name = SHPC_MODULE_NAME,
342 .id_table = shpcd_pci_tbl,
343 .probe = shpc_probe,
344 .remove = shpc_remove,
345};
346
347static int __init shpcd_init(void)
348{
349 int retval;
350
351 retval = pci_register_driver(&shpc_driver);
352 dbg("%s: pci_register_driver = %d\n", __func__, retval);
353 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
354
355 return retval;
356}
357
358static void __exit shpcd_cleanup(void)
359{
360 dbg("unload_shpchpd()\n");
361 pci_unregister_driver(&shpc_driver);
362 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
363}
364
365module_init(shpcd_init);
366module_exit(shpcd_cleanup);
367
