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/config.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/kernel.h>
34 #include <linux/types.h>
35 #include <linux/proc_fs.h>
36 #include <linux/slab.h>
37 #include <linux/workqueue.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <asm/uaccess.h>
43 /* Global variables */
47 struct controller *shpchp_ctrl_list; /* = NULL */
48 struct pci_func *shpchp_slot_list[256];
50 #define DRIVER_VERSION "0.4"
51 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
52 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
54 MODULE_AUTHOR(DRIVER_AUTHOR);
55 MODULE_DESCRIPTION(DRIVER_DESC);
56 MODULE_LICENSE("GPL");
58 module_param(shpchp_debug, bool, 0644);
59 module_param(shpchp_poll_mode, bool, 0644);
60 module_param(shpchp_poll_time, int, 0644);
61 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
62 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
63 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
65 #define SHPC_MODULE_NAME "shpchp"
67 static int shpc_start_thread (void);
68 static int set_attention_status (struct hotplug_slot *slot, u8 value);
69 static int enable_slot (struct hotplug_slot *slot);
70 static int disable_slot (struct hotplug_slot *slot);
71 static int get_power_status (struct hotplug_slot *slot, u8 *value);
72 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
73 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
74 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
75 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
76 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
78 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
80 .set_attention_status = set_attention_status,
81 .enable_slot = enable_slot,
82 .disable_slot = disable_slot,
83 .get_power_status = get_power_status,
84 .get_attention_status = get_attention_status,
85 .get_latch_status = get_latch_status,
86 .get_adapter_status = get_adapter_status,
87 .get_max_bus_speed = get_max_bus_speed,
88 .get_cur_bus_speed = get_cur_bus_speed,
92 * release_slot - free up the memory used by a slot
93 * @hotplug_slot: slot to free
95 static void release_slot(struct hotplug_slot *hotplug_slot)
97 struct slot *slot = hotplug_slot->private;
99 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
101 kfree(slot->hotplug_slot->info);
102 kfree(slot->hotplug_slot->name);
103 kfree(slot->hotplug_slot);
107 static int init_slots(struct controller *ctrl)
109 struct slot *new_slot;
112 u32 slot_number, sun;
113 int result = -ENOMEM;
115 dbg("%s\n",__FUNCTION__);
117 number_of_slots = ctrl->num_slots;
118 slot_device = ctrl->slot_device_offset;
119 slot_number = ctrl->first_slot;
121 while (number_of_slots) {
122 new_slot = (struct slot *) kmalloc(sizeof(struct slot), GFP_KERNEL);
126 memset(new_slot, 0, sizeof(struct slot));
127 new_slot->hotplug_slot = kmalloc (sizeof (struct hotplug_slot), GFP_KERNEL);
128 if (!new_slot->hotplug_slot)
130 memset(new_slot->hotplug_slot, 0, sizeof (struct hotplug_slot));
132 new_slot->hotplug_slot->info = kmalloc (sizeof (struct hotplug_slot_info), GFP_KERNEL);
133 if (!new_slot->hotplug_slot->info)
135 memset(new_slot->hotplug_slot->info, 0, sizeof (struct hotplug_slot_info));
136 new_slot->hotplug_slot->name = kmalloc (SLOT_NAME_SIZE, GFP_KERNEL);
137 if (!new_slot->hotplug_slot->name)
140 new_slot->magic = SLOT_MAGIC;
141 new_slot->ctrl = ctrl;
142 new_slot->bus = ctrl->slot_bus;
143 new_slot->device = slot_device;
144 new_slot->hpc_ops = ctrl->hpc_ops;
146 if (shpchprm_get_physical_slot_number(ctrl, &sun,
147 new_slot->bus, new_slot->device))
150 new_slot->number = sun;
151 new_slot->hp_slot = slot_device - ctrl->slot_device_offset;
153 /* register this slot with the hotplug pci core */
154 new_slot->hotplug_slot->private = new_slot;
155 new_slot->hotplug_slot->release = &release_slot;
156 make_slot_name(new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
157 new_slot->hotplug_slot->ops = &shpchp_hotplug_slot_ops;
159 new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status));
160 new_slot->hpc_ops->get_attention_status(new_slot, &(new_slot->hotplug_slot->info->attention_status));
161 new_slot->hpc_ops->get_latch_status(new_slot, &(new_slot->hotplug_slot->info->latch_status));
162 new_slot->hpc_ops->get_adapter_status(new_slot, &(new_slot->hotplug_slot->info->adapter_status));
164 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x slot_device_offset=%x\n", new_slot->bus,
165 new_slot->device, new_slot->hp_slot, new_slot->number, ctrl->slot_device_offset);
166 result = pci_hp_register (new_slot->hotplug_slot);
168 err ("pci_hp_register failed with error %d\n", result);
172 new_slot->next = ctrl->slot;
173 ctrl->slot = new_slot;
177 slot_number += ctrl->slot_num_inc;
183 kfree(new_slot->hotplug_slot->name);
185 kfree(new_slot->hotplug_slot->info);
187 kfree(new_slot->hotplug_slot);
194 static void cleanup_slots(struct controller *ctrl)
196 struct slot *old_slot, *next_slot;
198 old_slot = ctrl->slot;
202 next_slot = old_slot->next;
203 pci_hp_deregister(old_slot->hotplug_slot);
204 old_slot = next_slot;
208 static int get_ctlr_slot_config(struct controller *ctrl)
211 int first_device_num;
212 int physical_slot_num;
217 rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &updown, &flags);
219 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);
223 ctrl->num_slots = num_ctlr_slots;
224 ctrl->slot_device_offset = first_device_num;
225 ctrl->first_slot = physical_slot_num;
226 ctrl->slot_num_inc = updown; /* either -1 or 1 */
228 dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d (%x:%x)\n",
229 __FUNCTION__, num_ctlr_slots, first_device_num, physical_slot_num, updown, ctrl->bus, ctrl->device);
236 * set_attention_status - Turns the Amber LED for a slot on, off or blink
238 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
240 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
242 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
244 hotplug_slot->info->attention_status = status;
245 slot->hpc_ops->set_attention_status(slot, status);
251 static int enable_slot (struct hotplug_slot *hotplug_slot)
253 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
255 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
257 return shpchp_enable_slot(slot);
261 static int disable_slot (struct hotplug_slot *hotplug_slot)
263 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
265 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
267 return shpchp_disable_slot(slot);
270 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
272 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
275 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
277 retval = slot->hpc_ops->get_power_status(slot, value);
279 *value = hotplug_slot->info->power_status;
284 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
286 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
289 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
291 retval = slot->hpc_ops->get_attention_status(slot, value);
293 *value = hotplug_slot->info->attention_status;
298 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
300 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
303 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
305 retval = slot->hpc_ops->get_latch_status(slot, value);
307 *value = hotplug_slot->info->latch_status;
312 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
314 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
317 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
319 retval = slot->hpc_ops->get_adapter_status(slot, value);
321 *value = hotplug_slot->info->adapter_status;
326 static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
328 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
331 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
333 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
335 *value = PCI_SPEED_UNKNOWN;
340 static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
342 struct slot *slot = get_slot (hotplug_slot, __FUNCTION__);
345 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
347 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
349 *value = PCI_SPEED_UNKNOWN;
354 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
357 struct controller *ctrl;
359 int first_device_num; /* first PCI device number supported by this SHPC */
360 int num_ctlr_slots; /* number of slots supported by this SHPC */
362 ctrl = (struct controller *) kmalloc(sizeof(struct controller), GFP_KERNEL);
364 err("%s : out of memory\n", __FUNCTION__);
367 memset(ctrl, 0, sizeof(struct controller));
369 dbg("DRV_thread pid = %d\n", current->pid);
371 rc = shpc_init(ctrl, pdev,
372 (php_intr_callback_t) shpchp_handle_attention_button,
373 (php_intr_callback_t) shpchp_handle_switch_change,
374 (php_intr_callback_t) shpchp_handle_presence_change,
375 (php_intr_callback_t) shpchp_handle_power_fault);
377 dbg("%s: controller initialization failed\n", SHPC_MODULE_NAME);
378 goto err_out_free_ctrl;
381 dbg("%s: controller initialization success\n", __FUNCTION__);
382 ctrl->pci_dev = pdev; /* pci_dev of the P2P bridge */
384 pci_set_drvdata(pdev, ctrl);
386 ctrl->pci_bus = kmalloc (sizeof (*ctrl->pci_bus), GFP_KERNEL);
387 if (!ctrl->pci_bus) {
388 err("out of memory\n");
390 goto err_out_unmap_mmio_region;
393 memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));
394 ctrl->bus = pdev->bus->number;
395 ctrl->slot_bus = pdev->subordinate->number;
397 ctrl->device = PCI_SLOT(pdev->devfn);
398 ctrl->function = PCI_FUNC(pdev->devfn);
399 dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
402 * Save configuration headers for this and subordinate PCI buses
405 rc = get_ctlr_slot_config(ctrl);
407 err(msg_initialization_err, rc);
408 goto err_out_free_ctrl_bus;
410 first_device_num = ctrl->slot_device_offset;
411 num_ctlr_slots = ctrl->num_slots;
413 /* Store PCI Config Space for all devices on this bus */
414 rc = shpchp_save_config(ctrl, ctrl->slot_bus, num_ctlr_slots, first_device_num);
416 err("%s: unable to save PCI configuration data, error %d\n", __FUNCTION__, rc);
417 goto err_out_free_ctrl_bus;
420 ctrl->add_support = 1;
422 /* Setup the slot information structures */
423 rc = init_slots(ctrl);
425 err(msg_initialization_err, 6);
426 goto err_out_free_ctrl_slot;
429 /* Now hpc_functions (slot->hpc_ops->functions) are ready */
430 t_slot = shpchp_find_slot(ctrl, first_device_num);
432 /* Check for operation bus speed */
433 rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed);
434 dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot);
436 if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) {
437 err(SHPC_MODULE_NAME ": Can't get current bus speed. Set to 33MHz PCI.\n");
438 ctrl->speed = PCI_SPEED_33MHz;
441 /* Finish setting up the hot plug ctrl device */
442 ctrl->next_event = 0;
444 if (!shpchp_ctrl_list) {
445 shpchp_ctrl_list = ctrl;
448 ctrl->next = shpchp_ctrl_list;
449 shpchp_ctrl_list = ctrl;
452 shpchp_create_ctrl_files(ctrl);
456 err_out_free_ctrl_slot:
458 err_out_free_ctrl_bus:
459 kfree(ctrl->pci_bus);
460 err_out_unmap_mmio_region:
461 ctrl->hpc_ops->release_ctlr(ctrl);
469 static int shpc_start_thread(void)
474 dbg("Initialize + Start the notification/polling mechanism \n");
476 retval = shpchp_event_start_thread();
478 dbg("shpchp_event_start_thread() failed\n");
482 dbg("Initialize slot lists\n");
483 /* One slot list for each bus in the system */
484 for (loop = 0; loop < 256; loop++) {
485 shpchp_slot_list[loop] = NULL;
491 static void __exit unload_shpchpd(void)
493 struct pci_func *next;
494 struct pci_func *TempSlot;
496 struct controller *ctrl;
497 struct controller *tctrl;
499 ctrl = shpchp_ctrl_list;
504 kfree (ctrl->pci_bus);
506 dbg("%s: calling release_ctlr\n", __FUNCTION__);
507 ctrl->hpc_ops->release_ctlr(ctrl);
515 for (loop = 0; loop < 256; loop++) {
516 next = shpchp_slot_list[loop];
517 while (next != NULL) {
524 /* Stop the notification mechanism */
525 shpchp_event_stop_thread();
530 static struct pci_device_id shpcd_pci_tbl[] = {
532 .class = ((PCI_CLASS_BRIDGE_PCI << 8) | 0x00),
534 .vendor = PCI_ANY_ID,
535 .device = PCI_ANY_ID,
536 .subvendor = PCI_ANY_ID,
537 .subdevice = PCI_ANY_ID,
540 { /* end: all zeroes */ }
543 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
547 static struct pci_driver shpc_driver = {
548 .name = SHPC_MODULE_NAME,
549 .id_table = shpcd_pci_tbl,
551 /* remove: shpc_remove_one, */
556 static int __init shpcd_init(void)
560 #ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE
561 shpchp_poll_mode = 1;
564 retval = shpc_start_thread();
568 retval = pci_register_driver(&shpc_driver);
569 dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
570 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
574 shpchp_event_stop_thread();
579 static void __exit shpcd_cleanup(void)
581 dbg("unload_shpchpd()\n");
584 dbg("pci_unregister_driver\n");
585 pci_unregister_driver(&shpc_driver);
587 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
590 module_init(shpcd_init);
591 module_exit(shpcd_cleanup);