ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / drivers / pci / hotplug / pciehp_core.c
blob7ac8358df8fdd1a6591f259bb0216f37ca44cf65
1 /*
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
9 * All rights reserved.
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
20 * details.
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/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>
40 /* Global variables */
41 int pciehp_debug;
42 int pciehp_poll_mode;
43 int pciehp_poll_time;
44 int pciehp_force;
45 struct workqueue_struct *pciehp_wq;
46 struct workqueue_struct *pciehp_ordered_wq;
48 #define DRIVER_VERSION "0.4"
49 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
50 #define DRIVER_DESC "PCI Express Hot Plug Controller Driver"
52 MODULE_AUTHOR(DRIVER_AUTHOR);
53 MODULE_DESCRIPTION(DRIVER_DESC);
54 MODULE_LICENSE("GPL");
56 module_param(pciehp_debug, bool, 0644);
57 module_param(pciehp_poll_mode, bool, 0644);
58 module_param(pciehp_poll_time, int, 0644);
59 module_param(pciehp_force, bool, 0644);
60 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
61 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
62 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
63 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");
65 #define PCIE_MODULE_NAME "pciehp"
67 static int set_attention_status (struct hotplug_slot *slot, u8 value);
68 static int enable_slot (struct hotplug_slot *slot);
69 static int disable_slot (struct hotplug_slot *slot);
70 static int get_power_status (struct hotplug_slot *slot, u8 *value);
71 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
72 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
73 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
75 /**
76 * release_slot - free up the memory used by a slot
77 * @hotplug_slot: slot to free
79 static void release_slot(struct hotplug_slot *hotplug_slot)
81 struct slot *slot = hotplug_slot->private;
83 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
84 __func__, hotplug_slot_name(hotplug_slot));
86 kfree(hotplug_slot->ops);
87 kfree(hotplug_slot->info);
88 kfree(hotplug_slot);
91 static int init_slot(struct controller *ctrl)
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;
100 hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
101 if (!hotplug)
102 goto out;
104 info = kzalloc(sizeof(*info), GFP_KERNEL);
105 if (!info)
106 goto out;
108 /* Setup hotplug slot ops */
109 ops = kzalloc(sizeof(*ops), GFP_KERNEL);
110 if (!ops)
111 goto out;
112 ops->enable_slot = enable_slot;
113 ops->disable_slot = disable_slot;
114 ops->get_power_status = get_power_status;
115 ops->get_adapter_status = get_adapter_status;
116 if (MRL_SENS(ctrl))
117 ops->get_latch_status = get_latch_status;
118 if (ATTN_LED(ctrl)) {
119 ops->get_attention_status = get_attention_status;
120 ops->set_attention_status = set_attention_status;
123 /* register this slot with the hotplug pci core */
124 hotplug->info = info;
125 hotplug->private = slot;
126 hotplug->release = &release_slot;
127 hotplug->ops = ops;
128 slot->hotplug_slot = hotplug;
129 snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
131 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n",
132 pci_domain_nr(ctrl->pcie->port->subordinate),
133 ctrl->pcie->port->subordinate->number, PSN(ctrl));
134 retval = pci_hp_register(hotplug,
135 ctrl->pcie->port->subordinate, 0, name);
136 if (retval)
137 ctrl_err(ctrl,
138 "pci_hp_register failed with error %d\n", retval);
139 out:
140 if (retval) {
141 kfree(ops);
142 kfree(info);
143 kfree(hotplug);
145 return retval;
148 static void cleanup_slot(struct controller *ctrl)
150 pci_hp_deregister(ctrl->slot->hotplug_slot);
154 * set_attention_status - Turns the Amber LED for a slot on, off or blink
156 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
158 struct slot *slot = hotplug_slot->private;
160 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
161 __func__, slot_name(slot));
163 return pciehp_set_attention_status(slot, status);
167 static int enable_slot(struct hotplug_slot *hotplug_slot)
169 struct slot *slot = hotplug_slot->private;
171 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
172 __func__, slot_name(slot));
174 return pciehp_sysfs_enable_slot(slot);
178 static int disable_slot(struct hotplug_slot *hotplug_slot)
180 struct slot *slot = hotplug_slot->private;
182 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
183 __func__, slot_name(slot));
185 return pciehp_sysfs_disable_slot(slot);
188 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
190 struct slot *slot = hotplug_slot->private;
192 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
193 __func__, slot_name(slot));
195 return pciehp_get_power_status(slot, value);
198 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
200 struct slot *slot = hotplug_slot->private;
202 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
203 __func__, slot_name(slot));
205 return pciehp_get_attention_status(slot, value);
208 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
210 struct slot *slot = hotplug_slot->private;
212 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
213 __func__, slot_name(slot));
215 return pciehp_get_latch_status(slot, value);
218 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
220 struct slot *slot = hotplug_slot->private;
222 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
223 __func__, slot_name(slot));
225 return pciehp_get_adapter_status(slot, value);
228 static int pciehp_probe(struct pcie_device *dev)
230 int rc;
231 struct controller *ctrl;
232 struct slot *slot;
233 u8 occupied, poweron;
235 if (pciehp_force)
236 dev_info(&dev->device,
237 "Bypassing BIOS check for pciehp use on %s\n",
238 pci_name(dev->port));
239 else if (pciehp_acpi_slot_detection_check(dev->port))
240 goto err_out_none;
242 ctrl = pcie_init(dev);
243 if (!ctrl) {
244 dev_err(&dev->device, "Controller initialization failed\n");
245 goto err_out_none;
247 set_service_data(dev, ctrl);
249 /* Setup the slot information structures */
250 rc = init_slot(ctrl);
251 if (rc) {
252 if (rc == -EBUSY)
253 ctrl_warn(ctrl, "Slot already registered by another "
254 "hotplug driver\n");
255 else
256 ctrl_err(ctrl, "Slot initialization failed\n");
257 goto err_out_release_ctlr;
260 /* Enable events after we have setup the data structures */
261 rc = pcie_init_notification(ctrl);
262 if (rc) {
263 ctrl_err(ctrl, "Notification initialization failed\n");
264 goto err_out_free_ctrl_slot;
267 /* Check if slot is occupied */
268 slot = ctrl->slot;
269 pciehp_get_adapter_status(slot, &occupied);
270 pciehp_get_power_status(slot, &poweron);
271 if (occupied && pciehp_force)
272 pciehp_enable_slot(slot);
273 /* If empty slot's power status is on, turn power off */
274 if (!occupied && poweron && POWER_CTRL(ctrl))
275 pciehp_power_off_slot(slot);
277 return 0;
279 err_out_free_ctrl_slot:
280 cleanup_slot(ctrl);
281 err_out_release_ctlr:
282 pciehp_release_ctrl(ctrl);
283 err_out_none:
284 return -ENODEV;
287 static void pciehp_remove(struct pcie_device *dev)
289 struct controller *ctrl = get_service_data(dev);
291 cleanup_slot(ctrl);
292 pciehp_release_ctrl(ctrl);
295 #ifdef CONFIG_PM
296 static int pciehp_suspend (struct pcie_device *dev)
298 dev_info(&dev->device, "%s ENTRY\n", __func__);
299 return 0;
302 static int pciehp_resume (struct pcie_device *dev)
304 dev_info(&dev->device, "%s ENTRY\n", __func__);
305 if (pciehp_force) {
306 struct controller *ctrl = get_service_data(dev);
307 struct slot *slot;
308 u8 status;
310 /* reinitialize the chipset's event detection logic */
311 pcie_enable_notification(ctrl);
313 slot = ctrl->slot;
315 /* Check if slot is occupied */
316 pciehp_get_adapter_status(slot, &status);
317 if (status)
318 pciehp_enable_slot(slot);
319 else
320 pciehp_disable_slot(slot);
322 return 0;
324 #endif /* PM */
326 static struct pcie_port_service_driver hpdriver_portdrv = {
327 .name = PCIE_MODULE_NAME,
328 .port_type = PCIE_ANY_PORT,
329 .service = PCIE_PORT_SERVICE_HP,
331 .probe = pciehp_probe,
332 .remove = pciehp_remove,
334 #ifdef CONFIG_PM
335 .suspend = pciehp_suspend,
336 .resume = pciehp_resume,
337 #endif /* PM */
340 static int __init pcied_init(void)
342 int retval = 0;
344 pciehp_wq = alloc_workqueue("pciehp", 0, 0);
345 if (!pciehp_wq)
346 return -ENOMEM;
348 pciehp_ordered_wq = alloc_ordered_workqueue("pciehp_ordered", 0);
349 if (!pciehp_ordered_wq) {
350 destroy_workqueue(pciehp_wq);
351 return -ENOMEM;
354 pciehp_firmware_init();
355 retval = pcie_port_service_register(&hpdriver_portdrv);
356 dbg("pcie_port_service_register = %d\n", retval);
357 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
358 if (retval) {
359 destroy_workqueue(pciehp_ordered_wq);
360 destroy_workqueue(pciehp_wq);
361 dbg("Failure to register service\n");
363 return retval;
366 static void __exit pcied_cleanup(void)
368 dbg("unload_pciehpd()\n");
369 destroy_workqueue(pciehp_ordered_wq);
370 destroy_workqueue(pciehp_wq);
371 pcie_port_service_unregister(&hpdriver_portdrv);
372 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
375 module_init(pcied_init);
376 module_exit(pcied_cleanup);