1 /*
2 * PCI Express Hot Plug Controller Driver
3 *
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
8 *
9 * All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
20 * details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27 *
28 */
29
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/kernel.h>
33 #include <linux/slab.h>
34 #include <linux/types.h>
35 #include <linux/pci.h>
36 #include "pciehp.h"
37 #include <linux/interrupt.h>
38 #include <linux/time.h>
39
40 /* Global variables */
41 bool pciehp_debug;
42 bool pciehp_poll_mode;
43 int pciehp_poll_time;
44 static bool pciehp_force;
45
46 #define DRIVER_VERSION "0.4"
47 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
48 #define DRIVER_DESC "PCI Express Hot Plug Controller Driver"
49
50 MODULE_AUTHOR(DRIVER_AUTHOR);
51 MODULE_DESCRIPTION(DRIVER_DESC);
52 MODULE_LICENSE("GPL");
53
54 module_param(pciehp_debug, bool, 0644);
55 module_param(pciehp_poll_mode, bool, 0644);
56 module_param(pciehp_poll_time, int, 0644);
57 module_param(pciehp_force, bool, 0644);
58 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
59 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
60 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
61 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");
62
63 #define PCIE_MODULE_NAME "pciehp"
64
65 static int set_attention_status (struct hotplug_slot *slot, u8 value);
66 static int enable_slot (struct hotplug_slot *slot);
67 static int disable_slot (struct hotplug_slot *slot);
68 static int get_power_status (struct hotplug_slot *slot, u8 *value);
69 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
70 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
71 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
72 static int reset_slot (struct hotplug_slot *slot, int probe);
73
74 /**
75 * release_slot - free up the memory used by a slot
76 * @hotplug_slot: slot to free
77 */
release_slot(struct hotplug_slot * hotplug_slot)78 static void release_slot(struct hotplug_slot *hotplug_slot)
79 {
80 struct slot *slot = hotplug_slot->private;
81
82 /* queued work needs hotplug_slot name */
83 cancel_delayed_work(&slot->work);
84 drain_workqueue(slot->wq);
85
86 kfree(hotplug_slot->ops);
87 kfree(hotplug_slot->info);
88 kfree(hotplug_slot);
89 }
90
init_slot(struct controller * ctrl)91 static int init_slot(struct controller *ctrl)
92 {
93 struct slot *slot = ctrl->slot;
94 struct hotplug_slot *hotplug = NULL;
95 struct hotplug_slot_info *info = NULL;
96 struct hotplug_slot_ops *ops = NULL;
97 char name[SLOT_NAME_SIZE];
98 int retval = -ENOMEM;
99
100 hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
101 if (!hotplug)
102 goto out;
103
104 info = kzalloc(sizeof(*info), GFP_KERNEL);
105 if (!info)
106 goto out;
107
108 /* Setup hotplug slot ops */
109 ops = kzalloc(sizeof(*ops), GFP_KERNEL);
110 if (!ops)
111 goto out;
112
113 ops->enable_slot = enable_slot;
114 ops->disable_slot = disable_slot;
115 ops->get_power_status = get_power_status;
116 ops->get_adapter_status = get_adapter_status;
117 ops->reset_slot = reset_slot;
118 if (MRL_SENS(ctrl))
119 ops->get_latch_status = get_latch_status;
120 if (ATTN_LED(ctrl)) {
121 ops->get_attention_status = get_attention_status;
122 ops->set_attention_status = set_attention_status;
123 }
124
125 /* register this slot with the hotplug pci core */
126 hotplug->info = info;
127 hotplug->private = slot;
128 hotplug->release = &release_slot;
129 hotplug->ops = ops;
130 slot->hotplug_slot = hotplug;
131 snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
132
133 retval = pci_hp_register(hotplug,
134 ctrl->pcie->port->subordinate, 0, name);
135 if (retval)
136 ctrl_err(ctrl, "pci_hp_register failed: error %d\n", retval);
137 out:
138 if (retval) {
139 kfree(ops);
140 kfree(info);
141 kfree(hotplug);
142 }
143 return retval;
144 }
145
cleanup_slot(struct controller * ctrl)146 static void cleanup_slot(struct controller *ctrl)
147 {
148 pci_hp_deregister(ctrl->slot->hotplug_slot);
149 }
150
151 /*
152 * set_attention_status - Turns the Amber LED for a slot on, off or blink
153 */
set_attention_status(struct hotplug_slot * hotplug_slot,u8 status)154 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
155 {
156 struct slot *slot = hotplug_slot->private;
157
158 pciehp_set_attention_status(slot, status);
159 return 0;
160 }
161
162
enable_slot(struct hotplug_slot * hotplug_slot)163 static int enable_slot(struct hotplug_slot *hotplug_slot)
164 {
165 struct slot *slot = hotplug_slot->private;
166
167 return pciehp_sysfs_enable_slot(slot);
168 }
169
170
disable_slot(struct hotplug_slot * hotplug_slot)171 static int disable_slot(struct hotplug_slot *hotplug_slot)
172 {
173 struct slot *slot = hotplug_slot->private;
174
175 return pciehp_sysfs_disable_slot(slot);
176 }
177
get_power_status(struct hotplug_slot * hotplug_slot,u8 * value)178 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
179 {
180 struct slot *slot = hotplug_slot->private;
181
182 pciehp_get_power_status(slot, value);
183 return 0;
184 }
185
get_attention_status(struct hotplug_slot * hotplug_slot,u8 * value)186 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
187 {
188 struct slot *slot = hotplug_slot->private;
189
190 pciehp_get_attention_status(slot, value);
191 return 0;
192 }
193
get_latch_status(struct hotplug_slot * hotplug_slot,u8 * value)194 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
195 {
196 struct slot *slot = hotplug_slot->private;
197
198 pciehp_get_latch_status(slot, value);
199 return 0;
200 }
201
get_adapter_status(struct hotplug_slot * hotplug_slot,u8 * value)202 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
203 {
204 struct slot *slot = hotplug_slot->private;
205
206 pciehp_get_adapter_status(slot, value);
207 return 0;
208 }
209
reset_slot(struct hotplug_slot * hotplug_slot,int probe)210 static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
211 {
212 struct slot *slot = hotplug_slot->private;
213
214 return pciehp_reset_slot(slot, probe);
215 }
216
pciehp_probe(struct pcie_device * dev)217 static int pciehp_probe(struct pcie_device *dev)
218 {
219 int rc;
220 struct controller *ctrl;
221 struct slot *slot;
222 u8 occupied, poweron;
223
224 /* If this is not a "hotplug" service, we have no business here. */
225 if (dev->service != PCIE_PORT_SERVICE_HP)
226 return -ENODEV;
227
228 if (!dev->port->subordinate) {
229 /* Can happen if we run out of bus numbers during probe */
230 dev_err(&dev->device,
231 "Hotplug bridge without secondary bus, ignoring\n");
232 return -ENODEV;
233 }
234
235 ctrl = pcie_init(dev);
236 if (!ctrl) {
237 dev_err(&dev->device, "Controller initialization failed\n");
238 return -ENODEV;
239 }
240 set_service_data(dev, ctrl);
241
242 /* Setup the slot information structures */
243 rc = init_slot(ctrl);
244 if (rc) {
245 if (rc == -EBUSY)
246 ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n");
247 else
248 ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc);
249 goto err_out_release_ctlr;
250 }
251
252 /* Enable events after we have setup the data structures */
253 rc = pcie_init_notification(ctrl);
254 if (rc) {
255 ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc);
256 goto err_out_free_ctrl_slot;
257 }
258
259 /* Check if slot is occupied */
260 slot = ctrl->slot;
261 pciehp_get_adapter_status(slot, &occupied);
262 pciehp_get_power_status(slot, &poweron);
263 if (occupied && pciehp_force) {
264 mutex_lock(&slot->hotplug_lock);
265 pciehp_enable_slot(slot);
266 mutex_unlock(&slot->hotplug_lock);
267 }
268 /* If empty slot's power status is on, turn power off */
269 if (!occupied && poweron && POWER_CTRL(ctrl))
270 pciehp_power_off_slot(slot);
271
272 return 0;
273
274 err_out_free_ctrl_slot:
275 cleanup_slot(ctrl);
276 err_out_release_ctlr:
277 pciehp_release_ctrl(ctrl);
278 return -ENODEV;
279 }
280
pciehp_remove(struct pcie_device * dev)281 static void pciehp_remove(struct pcie_device *dev)
282 {
283 struct controller *ctrl = get_service_data(dev);
284
285 pcie_shutdown_notification(ctrl);
286 cleanup_slot(ctrl);
287 pciehp_release_ctrl(ctrl);
288 }
289
290 #ifdef CONFIG_PM
pciehp_suspend(struct pcie_device * dev)291 static int pciehp_suspend(struct pcie_device *dev)
292 {
293 return 0;
294 }
295
pciehp_resume(struct pcie_device * dev)296 static int pciehp_resume(struct pcie_device *dev)
297 {
298 struct controller *ctrl;
299 struct slot *slot;
300 u8 status;
301
302 ctrl = get_service_data(dev);
303
304 /* reinitialize the chipset's event detection logic */
305 pcie_reenable_notification(ctrl);
306
307 slot = ctrl->slot;
308
309 /* Check if slot is occupied */
310 pciehp_get_adapter_status(slot, &status);
311 mutex_lock(&slot->hotplug_lock);
312 if (status)
313 pciehp_enable_slot(slot);
314 else
315 pciehp_disable_slot(slot);
316 mutex_unlock(&slot->hotplug_lock);
317 return 0;
318 }
319 #endif /* PM */
320
321 static struct pcie_port_service_driver hpdriver_portdrv = {
322 .name = PCIE_MODULE_NAME,
323 .port_type = PCIE_ANY_PORT,
324 .service = PCIE_PORT_SERVICE_HP,
325
326 .probe = pciehp_probe,
327 .remove = pciehp_remove,
328
329 #ifdef CONFIG_PM
330 .suspend = pciehp_suspend,
331 .resume = pciehp_resume,
332 #endif /* PM */
333 };
334
pcied_init(void)335 static int __init pcied_init(void)
336 {
337 int retval = 0;
338
339 retval = pcie_port_service_register(&hpdriver_portdrv);
340 dbg("pcie_port_service_register = %d\n", retval);
341 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
342 if (retval)
343 dbg("Failure to register service\n");
344
345 return retval;
346 }
347
pcied_cleanup(void)348 static void __exit pcied_cleanup(void)
349 {
350 dbg("unload_pciehpd()\n");
351 pcie_port_service_unregister(&hpdriver_portdrv);
352 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
353 }
354
355 module_init(pcied_init);
356 module_exit(pcied_cleanup);
357