2 * PCI Express 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>
36 #include <linux/interrupt.h>
38 /* Global variables */
43 struct controller *pciehp_ctrl_list;
45 #define DRIVER_VERSION "0.4"
46 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
47 #define DRIVER_DESC "PCI Express Hot Plug Controller Driver"
49 MODULE_AUTHOR(DRIVER_AUTHOR);
50 MODULE_DESCRIPTION(DRIVER_DESC);
51 MODULE_LICENSE("GPL");
53 module_param(pciehp_debug, bool, 0644);
54 module_param(pciehp_poll_mode, bool, 0644);
55 module_param(pciehp_poll_time, int, 0644);
56 module_param(pciehp_force, bool, 0644);
57 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
58 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
59 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
60 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
62 #define PCIE_MODULE_NAME "pciehp"
64 static int pcie_start_thread (void);
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 get_address (struct hotplug_slot *slot, u32 *value);
73 static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
74 static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
76 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
78 .set_attention_status = set_attention_status,
79 .enable_slot = enable_slot,
80 .disable_slot = disable_slot,
81 .get_power_status = get_power_status,
82 .get_attention_status = get_attention_status,
83 .get_latch_status = get_latch_status,
84 .get_adapter_status = get_adapter_status,
85 .get_address = get_address,
86 .get_max_bus_speed = get_max_bus_speed,
87 .get_cur_bus_speed = get_cur_bus_speed,
91 * release_slot - free up the memory used by a slot
92 * @hotplug_slot: slot to free
94 static void release_slot(struct hotplug_slot *hotplug_slot)
96 struct slot *slot = hotplug_slot->private;
98 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
100 kfree(slot->hotplug_slot->info);
101 kfree(slot->hotplug_slot);
105 static void make_slot_name(struct slot *slot)
107 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
108 slot->bus, slot->number);
111 static int init_slots(struct controller *ctrl)
114 struct hotplug_slot *hotplug_slot;
115 struct hotplug_slot_info *info;
116 int retval = -ENOMEM;
119 for (i = 0; i < ctrl->num_slots; i++) {
120 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
124 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
127 slot->hotplug_slot = hotplug_slot;
129 info = kzalloc(sizeof(*info), GFP_KERNEL);
132 hotplug_slot->info = info;
134 hotplug_slot->name = slot->name;
138 slot->bus = ctrl->pci_dev->subordinate->number;
139 slot->device = ctrl->slot_device_offset + i;
140 slot->hpc_ops = ctrl->hpc_ops;
141 slot->number = ctrl->first_slot;
143 /* register this slot with the hotplug pci core */
144 hotplug_slot->private = slot;
145 hotplug_slot->release = &release_slot;
146 make_slot_name(slot);
147 hotplug_slot->ops = &pciehp_hotplug_slot_ops;
149 get_power_status(hotplug_slot, &info->power_status);
150 get_attention_status(hotplug_slot, &info->attention_status);
151 get_latch_status(hotplug_slot, &info->latch_status);
152 get_adapter_status(hotplug_slot, &info->adapter_status);
154 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
155 "slot_device_offset=%x\n", slot->bus, slot->device,
156 slot->hp_slot, slot->number, ctrl->slot_device_offset);
157 retval = pci_hp_register(hotplug_slot);
159 err ("pci_hp_register failed with error %d\n", retval);
163 list_add(&slot->slot_list, &ctrl->slot_list);
177 static void cleanup_slots(struct controller *ctrl)
179 struct list_head *tmp;
180 struct list_head *next;
183 list_for_each_safe(tmp, next, &ctrl->slot_list) {
184 slot = list_entry(tmp, struct slot, slot_list);
185 list_del(&slot->slot_list);
186 pci_hp_deregister(slot->hotplug_slot);
190 static int get_ctlr_slot_config(struct controller *ctrl)
192 int num_ctlr_slots; /* Not needed; PCI Express has 1 slot per port*/
193 int first_device_num; /* Not needed */
194 int physical_slot_num;
198 rc = pcie_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &ctrlcap);
200 err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);
204 ctrl->num_slots = num_ctlr_slots; /* PCI Express has 1 slot per port */
205 ctrl->slot_device_offset = first_device_num;
206 ctrl->first_slot = physical_slot_num;
207 ctrl->ctrlcap = ctrlcap;
209 dbg("%s: bus(0x%x) num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) ctrlcap(%x) for b:d (%x:%x)\n",
210 __FUNCTION__, ctrl->slot_bus, num_ctlr_slots, first_device_num, physical_slot_num, ctrlcap,
211 ctrl->bus, ctrl->device);
218 * set_attention_status - Turns the Amber LED for a slot on, off or blink
220 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
222 struct slot *slot = hotplug_slot->private;
224 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
226 hotplug_slot->info->attention_status = status;
228 if (ATTN_LED(slot->ctrl->ctrlcap))
229 slot->hpc_ops->set_attention_status(slot, status);
235 static int enable_slot(struct hotplug_slot *hotplug_slot)
237 struct slot *slot = hotplug_slot->private;
239 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
241 return pciehp_enable_slot(slot);
245 static int disable_slot(struct hotplug_slot *hotplug_slot)
247 struct slot *slot = hotplug_slot->private;
249 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
251 return pciehp_disable_slot(slot);
254 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
256 struct slot *slot = hotplug_slot->private;
259 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
261 retval = slot->hpc_ops->get_power_status(slot, value);
263 *value = hotplug_slot->info->power_status;
268 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
270 struct slot *slot = hotplug_slot->private;
273 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
275 retval = slot->hpc_ops->get_attention_status(slot, value);
277 *value = hotplug_slot->info->attention_status;
282 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
284 struct slot *slot = hotplug_slot->private;
287 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
289 retval = slot->hpc_ops->get_latch_status(slot, value);
291 *value = hotplug_slot->info->latch_status;
296 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
298 struct slot *slot = hotplug_slot->private;
301 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
303 retval = slot->hpc_ops->get_adapter_status(slot, value);
305 *value = hotplug_slot->info->adapter_status;
310 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
312 struct slot *slot = hotplug_slot->private;
313 struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
315 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
317 *value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
322 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
324 struct slot *slot = hotplug_slot->private;
327 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
329 retval = slot->hpc_ops->get_max_bus_speed(slot, value);
331 *value = PCI_SPEED_UNKNOWN;
336 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
338 struct slot *slot = hotplug_slot->private;
341 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
343 retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
345 *value = PCI_SPEED_UNKNOWN;
350 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
353 struct controller *ctrl;
355 int first_device_num = 0 ; /* first PCI device number supported by this PCIE */
356 int num_ctlr_slots; /* number of slots supported by this HPC */
358 struct pci_dev *pdev;
360 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
362 err("%s : out of memory\n", __FUNCTION__);
365 INIT_LIST_HEAD(&ctrl->slot_list);
368 ctrl->pci_dev = pdev;
370 rc = pcie_init(ctrl, dev);
372 dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
373 goto err_out_free_ctrl;
376 pci_set_drvdata(pdev, ctrl);
378 ctrl->pci_bus = kmalloc(sizeof(*ctrl->pci_bus), GFP_KERNEL);
379 if (!ctrl->pci_bus) {
380 err("%s: out of memory\n", __FUNCTION__);
382 goto err_out_unmap_mmio_region;
384 memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));
385 ctrl->bus = pdev->bus->number; /* ctrl bus */
386 ctrl->slot_bus = pdev->subordinate->number; /* bus controlled by this HPC */
388 ctrl->device = PCI_SLOT(pdev->devfn);
389 ctrl->function = PCI_FUNC(pdev->devfn);
390 dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,
391 ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
394 * Save configuration headers for this and subordinate PCI buses
397 rc = get_ctlr_slot_config(ctrl);
399 err(msg_initialization_err, rc);
400 goto err_out_free_ctrl_bus;
402 first_device_num = ctrl->slot_device_offset;
403 num_ctlr_slots = ctrl->num_slots;
405 /* Setup the slot information structures */
406 rc = init_slots(ctrl);
408 err(msg_initialization_err, 6);
409 goto err_out_free_ctrl_slot;
412 t_slot = pciehp_find_slot(ctrl, first_device_num);
414 /* Finish setting up the hot plug ctrl device */
415 ctrl->next_event = 0;
417 if (!pciehp_ctrl_list) {
418 pciehp_ctrl_list = ctrl;
421 ctrl->next = pciehp_ctrl_list;
422 pciehp_ctrl_list = ctrl;
425 /* Wait for exclusive access to hardware */
426 mutex_lock(&ctrl->ctrl_lock);
428 t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
430 if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
431 rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
433 /* Done with exclusive hardware access */
434 mutex_unlock(&ctrl->ctrl_lock);
435 goto err_out_free_ctrl_slot;
437 /* Wait for the command to complete */
438 wait_for_ctrl_irq (ctrl);
441 /* Done with exclusive hardware access */
442 mutex_unlock(&ctrl->ctrl_lock);
446 err_out_free_ctrl_slot:
448 err_out_free_ctrl_bus:
449 kfree(ctrl->pci_bus);
450 err_out_unmap_mmio_region:
451 ctrl->hpc_ops->release_ctlr(ctrl);
459 static int pcie_start_thread(void)
463 dbg("Initialize + Start the notification/polling mechanism \n");
465 retval = pciehp_event_start_thread();
467 dbg("pciehp_event_start_thread() failed\n");
474 static void __exit unload_pciehpd(void)
476 struct controller *ctrl;
477 struct controller *tctrl;
479 ctrl = pciehp_ctrl_list;
484 kfree (ctrl->pci_bus);
486 ctrl->hpc_ops->release_ctlr(ctrl);
494 /* Stop the notification mechanism */
495 pciehp_event_stop_thread();
499 static void pciehp_remove (struct pcie_device *device)
501 /* XXX - Needs to be adapted to device driver model */
505 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
507 printk("%s ENTRY\n", __FUNCTION__);
511 static int pciehp_resume (struct pcie_device *dev)
513 printk("%s ENTRY\n", __FUNCTION__);
518 static struct pcie_port_service_id port_pci_ids[] = { {
519 .vendor = PCI_ANY_ID,
520 .device = PCI_ANY_ID,
521 .port_type = PCIE_ANY_PORT,
522 .service_type = PCIE_PORT_SERVICE_HP,
524 }, { /* end: all zeroes */ }
526 static const char device_name[] = "hpdriver";
528 static struct pcie_port_service_driver hpdriver_portdrv = {
529 .name = (char *)device_name,
530 .id_table = &port_pci_ids[0],
532 .probe = pciehp_probe,
533 .remove = pciehp_remove,
536 .suspend = pciehp_suspend,
537 .resume = pciehp_resume,
541 static int __init pcied_init(void)
545 #ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
546 pciehp_poll_mode = 1;
549 retval = pcie_start_thread();
553 retval = pcie_port_service_register(&hpdriver_portdrv);
554 dbg("pcie_port_service_register = %d\n", retval);
555 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
557 dbg("%s: Failure to register service\n", __FUNCTION__);
561 pciehp_event_stop_thread();
567 static void __exit pcied_cleanup(void)
569 dbg("unload_pciehpd()\n");
572 pcie_port_service_unregister(&hpdriver_portdrv);
574 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
577 module_init(pcied_init);
578 module_exit(pcied_cleanup);