2 * Standard Hot Plug Controller Driver
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
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.
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
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.
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/kernel.h>
33 #include <linux/types.h>
34 #include <linux/pci.h>
35 #include <linux/workqueue.h>
38 /* Global variables */
42 struct workqueue_struct *shpchp_wq;
44 #define DRIVER_VERSION "0.4"
45 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
46 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
48 MODULE_AUTHOR(DRIVER_AUTHOR);
49 MODULE_DESCRIPTION(DRIVER_DESC);
50 MODULE_LICENSE("GPL");
52 module_param(shpchp_debug, bool, 0644);
53 module_param(shpchp_poll_mode, bool, 0644);
54 module_param(shpchp_poll_time, int, 0644);
55 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
56 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
57 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
59 #define SHPC_MODULE_NAME "shpchp"
61 static int set_attention_status (struct hotplug_slot *slot, u8 value);
62 static int enable_slot (struct hotplug_slot *slot);
63 static int disable_slot (struct hotplug_slot *slot);
64 static int get_power_status (struct hotplug_slot *slot, u8 *value);
65 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
66 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
67 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
68 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
69 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
71 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
73 .set_attention_status = set_attention_status,
74 .enable_slot = enable_slot,
75 .disable_slot = disable_slot,
76 .get_power_status = get_power_status,
77 .get_attention_status = get_attention_status,
78 .get_latch_status = get_latch_status,
79 .get_adapter_status = get_adapter_status,
80 .get_max_bus_speed = get_max_bus_speed,
81 .get_cur_bus_speed = get_cur_bus_speed,
85 * release_slot - free up the memory used by a slot
86 * @hotplug_slot: slot to free
88 static void release_slot(struct hotplug_slot *hotplug_slot)
90 struct slot *slot = hotplug_slot->private;
92 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
94 kfree(slot->hotplug_slot->info);
95 kfree(slot->hotplug_slot);
99 static int init_slots(struct controller *ctrl)
102 struct hotplug_slot *hotplug_slot;
103 struct hotplug_slot_info *info;
104 int retval = -ENOMEM;
107 for (i = 0; i < ctrl->num_slots; i++) {
108 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
112 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
115 slot->hotplug_slot = hotplug_slot;
117 info = kzalloc(sizeof(*info), GFP_KERNEL);
120 hotplug_slot->info = info;
122 hotplug_slot->name = slot->name;
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 mutex_init(&slot->lock);
131 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
133 /* register this slot with the hotplug pci core */
134 hotplug_slot->private = slot;
135 hotplug_slot->release = &release_slot;
136 snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number);
137 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
139 get_power_status(hotplug_slot, &info->power_status);
140 get_attention_status(hotplug_slot, &info->attention_status);
141 get_latch_status(hotplug_slot, &info->latch_status);
142 get_adapter_status(hotplug_slot, &info->adapter_status);
144 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
145 "slot_device_offset=%x\n", slot->bus, slot->device,
146 slot->hp_slot, slot->number, ctrl->slot_device_offset);
148 retval = pci_hp_register(slot->hotplug_slot,
149 ctrl->pci_dev->subordinate, slot->device,
153 * If slot N already exists, we'll try to create
154 * slot N-1, N-2 ... N-M, until we overflow.
156 if (retval == -EEXIST) {
157 len = snprintf(slot->name, SLOT_NAME_SIZE,
158 "%d-%d", slot->number, dup++);
159 if (len < SLOT_NAME_SIZE)
162 err("duplicate slot name overflow\n");
164 err("pci_hp_register failed with error %d\n", retval);
168 list_add(&slot->slot_list, &ctrl->slot_list);
182 void cleanup_slots(struct controller *ctrl)
184 struct list_head *tmp;
185 struct list_head *next;
188 list_for_each_safe(tmp, next, &ctrl->slot_list) {
189 slot = list_entry(tmp, struct slot, slot_list);
190 list_del(&slot->slot_list);
191 cancel_delayed_work(&slot->work);
192 flush_scheduled_work();
193 flush_workqueue(shpchp_wq);
194 pci_hp_deregister(slot->hotplug_slot);
199 * set_attention_status - Turns the Amber LED for a slot on, off or blink
201 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
203 struct slot *slot = get_slot(hotplug_slot);
205 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
207 hotplug_slot->info->attention_status = status;
208 slot->hpc_ops->set_attention_status(slot, status);
213 static int enable_slot (struct hotplug_slot *hotplug_slot)
215 struct slot *slot = get_slot(hotplug_slot);
217 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
219 return shpchp_sysfs_enable_slot(slot);
222 static int disable_slot (struct hotplug_slot *hotplug_slot)
224 struct slot *slot = get_slot(hotplug_slot);
226 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
228 return shpchp_sysfs_disable_slot(slot);
231 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
233 struct slot *slot = get_slot(hotplug_slot);
236 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
238 retval = slot->hpc_ops->get_power_status(slot, value);
240 *value = hotplug_slot->info->power_status;
245 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
247 struct slot *slot = get_slot(hotplug_slot);
250 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
252 retval = slot->hpc_ops->get_attention_status(slot, value);
254 *value = hotplug_slot->info->attention_status;
259 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
261 struct slot *slot = get_slot(hotplug_slot);
264 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
266 retval = slot->hpc_ops->get_latch_status(slot, value);
268 *value = hotplug_slot->info->latch_status;
273 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
275 struct slot *slot = get_slot(hotplug_slot);
278 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
280 retval = slot->hpc_ops->get_adapter_status(slot, value);
282 *value = hotplug_slot->info->adapter_status;
287 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
288 enum pci_bus_speed *value)
290 struct slot *slot = get_slot(hotplug_slot);
293 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
295 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
297 *value = PCI_SPEED_UNKNOWN;
302 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
304 struct slot *slot = get_slot(hotplug_slot);
307 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
309 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
311 *value = PCI_SPEED_UNKNOWN;
316 static int is_shpc_capable(struct pci_dev *dev)
318 if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
319 PCI_DEVICE_ID_AMD_GOLAM_7450))
321 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
323 if (get_hp_hw_control_from_firmware(dev))
328 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
331 struct controller *ctrl;
333 if (!is_shpc_capable(pdev))
336 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
338 err("%s : out of memory\n", __func__);
341 INIT_LIST_HEAD(&ctrl->slot_list);
343 rc = shpc_init(ctrl, pdev);
345 dbg("%s: controller initialization failed\n",
347 goto err_out_free_ctrl;
350 pci_set_drvdata(pdev, ctrl);
352 /* Setup the slot information structures */
353 rc = init_slots(ctrl);
355 err("%s: slot initialization failed\n", SHPC_MODULE_NAME);
356 goto err_out_release_ctlr;
359 rc = shpchp_create_ctrl_files(ctrl);
361 goto err_cleanup_slots;
367 err_out_release_ctlr:
368 ctrl->hpc_ops->release_ctlr(ctrl);
375 static void shpc_remove(struct pci_dev *dev)
377 struct controller *ctrl = pci_get_drvdata(dev);
379 shpchp_remove_ctrl_files(ctrl);
380 ctrl->hpc_ops->release_ctlr(ctrl);
384 static struct pci_device_id shpcd_pci_tbl[] = {
385 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
386 { /* end: all zeroes */ }
388 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
390 static struct pci_driver shpc_driver = {
391 .name = SHPC_MODULE_NAME,
392 .id_table = shpcd_pci_tbl,
394 .remove = shpc_remove,
397 static int __init shpcd_init(void)
401 retval = pci_register_driver(&shpc_driver);
402 dbg("%s: pci_register_driver = %d\n", __func__, retval);
403 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
407 static void __exit shpcd_cleanup(void)
409 dbg("unload_shpchpd()\n");
410 pci_unregister_driver(&shpc_driver);
411 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
414 module_init(shpcd_init);
415 module_exit(shpcd_cleanup);