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/moduleparam.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/types.h>
34 #include <linux/pci.h>
36 #include <linux/interrupt.h>
37 #include <linux/time.h>
39 /* Global variables */
41 bool pciehp_poll_mode
;
43 static bool pciehp_force
;
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"
50 * not really modular, but the easiest way to keep compat with existing
51 * bootargs behaviour is to continue using module_param here.
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 OSHP is missing");
62 #define PCIE_MODULE_NAME "pciehp"
64 static int set_attention_status(struct hotplug_slot
*slot
, u8 value
);
65 static int enable_slot(struct hotplug_slot
*slot
);
66 static int disable_slot(struct hotplug_slot
*slot
);
67 static int get_power_status(struct hotplug_slot
*slot
, u8
*value
);
68 static int get_attention_status(struct hotplug_slot
*slot
, u8
*value
);
69 static int get_latch_status(struct hotplug_slot
*slot
, u8
*value
);
70 static int get_adapter_status(struct hotplug_slot
*slot
, u8
*value
);
71 static int reset_slot(struct hotplug_slot
*slot
, int probe
);
74 * release_slot - free up the memory used by a slot
75 * @hotplug_slot: slot to free
77 static void release_slot(struct hotplug_slot
*hotplug_slot
)
79 kfree(hotplug_slot
->ops
);
80 kfree(hotplug_slot
->info
);
84 static int init_slot(struct controller
*ctrl
)
86 struct slot
*slot
= ctrl
->slot
;
87 struct hotplug_slot
*hotplug
= NULL
;
88 struct hotplug_slot_info
*info
= NULL
;
89 struct hotplug_slot_ops
*ops
= NULL
;
90 char name
[SLOT_NAME_SIZE
];
93 hotplug
= kzalloc(sizeof(*hotplug
), GFP_KERNEL
);
97 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
101 /* Setup hotplug slot ops */
102 ops
= kzalloc(sizeof(*ops
), GFP_KERNEL
);
106 ops
->enable_slot
= enable_slot
;
107 ops
->disable_slot
= disable_slot
;
108 ops
->get_power_status
= get_power_status
;
109 ops
->get_adapter_status
= get_adapter_status
;
110 ops
->reset_slot
= reset_slot
;
112 ops
->get_latch_status
= get_latch_status
;
113 if (ATTN_LED(ctrl
)) {
114 ops
->get_attention_status
= get_attention_status
;
115 ops
->set_attention_status
= set_attention_status
;
118 /* register this slot with the hotplug pci core */
119 hotplug
->info
= info
;
120 hotplug
->private = slot
;
121 hotplug
->release
= &release_slot
;
123 slot
->hotplug_slot
= hotplug
;
124 snprintf(name
, SLOT_NAME_SIZE
, "%u", PSN(ctrl
));
126 retval
= pci_hp_register(hotplug
,
127 ctrl
->pcie
->port
->subordinate
, 0, name
);
129 ctrl_err(ctrl
, "pci_hp_register failed: error %d\n", retval
);
139 static void cleanup_slot(struct controller
*ctrl
)
141 pci_hp_deregister(ctrl
->slot
->hotplug_slot
);
145 * set_attention_status - Turns the Amber LED for a slot on, off or blink
147 static int set_attention_status(struct hotplug_slot
*hotplug_slot
, u8 status
)
149 struct slot
*slot
= hotplug_slot
->private;
151 pciehp_set_attention_status(slot
, status
);
156 static int enable_slot(struct hotplug_slot
*hotplug_slot
)
158 struct slot
*slot
= hotplug_slot
->private;
160 return pciehp_sysfs_enable_slot(slot
);
164 static int disable_slot(struct hotplug_slot
*hotplug_slot
)
166 struct slot
*slot
= hotplug_slot
->private;
168 return pciehp_sysfs_disable_slot(slot
);
171 static int get_power_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
173 struct slot
*slot
= hotplug_slot
->private;
175 pciehp_get_power_status(slot
, value
);
179 static int get_attention_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
181 struct slot
*slot
= hotplug_slot
->private;
183 pciehp_get_attention_status(slot
, value
);
187 static int get_latch_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
189 struct slot
*slot
= hotplug_slot
->private;
191 pciehp_get_latch_status(slot
, value
);
195 static int get_adapter_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
197 struct slot
*slot
= hotplug_slot
->private;
199 pciehp_get_adapter_status(slot
, value
);
203 static int reset_slot(struct hotplug_slot
*hotplug_slot
, int probe
)
205 struct slot
*slot
= hotplug_slot
->private;
207 return pciehp_reset_slot(slot
, probe
);
210 static int pciehp_probe(struct pcie_device
*dev
)
213 struct controller
*ctrl
;
215 u8 occupied
, poweron
;
217 /* If this is not a "hotplug" service, we have no business here. */
218 if (dev
->service
!= PCIE_PORT_SERVICE_HP
)
221 if (!dev
->port
->subordinate
) {
222 /* Can happen if we run out of bus numbers during probe */
223 dev_err(&dev
->device
,
224 "Hotplug bridge without secondary bus, ignoring\n");
228 ctrl
= pcie_init(dev
);
230 dev_err(&dev
->device
, "Controller initialization failed\n");
233 set_service_data(dev
, ctrl
);
235 /* Setup the slot information structures */
236 rc
= init_slot(ctrl
);
239 ctrl_warn(ctrl
, "Slot already registered by another hotplug driver\n");
241 ctrl_err(ctrl
, "Slot initialization failed (%d)\n", rc
);
242 goto err_out_release_ctlr
;
245 /* Enable events after we have setup the data structures */
246 rc
= pcie_init_notification(ctrl
);
248 ctrl_err(ctrl
, "Notification initialization failed (%d)\n", rc
);
249 goto err_out_free_ctrl_slot
;
252 /* Check if slot is occupied */
254 pciehp_get_adapter_status(slot
, &occupied
);
255 pciehp_get_power_status(slot
, &poweron
);
256 if (occupied
&& pciehp_force
) {
257 mutex_lock(&slot
->hotplug_lock
);
258 pciehp_enable_slot(slot
);
259 mutex_unlock(&slot
->hotplug_lock
);
261 /* If empty slot's power status is on, turn power off */
262 if (!occupied
&& poweron
&& POWER_CTRL(ctrl
))
263 pciehp_power_off_slot(slot
);
267 err_out_free_ctrl_slot
:
269 err_out_release_ctlr
:
270 pciehp_release_ctrl(ctrl
);
274 static void pciehp_remove(struct pcie_device
*dev
)
276 struct controller
*ctrl
= get_service_data(dev
);
279 pciehp_release_ctrl(ctrl
);
283 static int pciehp_suspend(struct pcie_device
*dev
)
288 static int pciehp_resume(struct pcie_device
*dev
)
290 struct controller
*ctrl
;
294 ctrl
= get_service_data(dev
);
296 /* reinitialize the chipset's event detection logic */
297 pcie_enable_notification(ctrl
);
301 /* Check if slot is occupied */
302 pciehp_get_adapter_status(slot
, &status
);
303 mutex_lock(&slot
->hotplug_lock
);
305 pciehp_enable_slot(slot
);
307 pciehp_disable_slot(slot
);
308 mutex_unlock(&slot
->hotplug_lock
);
313 static struct pcie_port_service_driver hpdriver_portdrv
= {
314 .name
= PCIE_MODULE_NAME
,
315 .port_type
= PCIE_ANY_PORT
,
316 .service
= PCIE_PORT_SERVICE_HP
,
318 .probe
= pciehp_probe
,
319 .remove
= pciehp_remove
,
322 .suspend
= pciehp_suspend
,
323 .resume
= pciehp_resume
,
327 static int __init
pcied_init(void)
331 retval
= pcie_port_service_register(&hpdriver_portdrv
);
332 dbg("pcie_port_service_register = %d\n", retval
);
333 info(DRIVER_DESC
" version: " DRIVER_VERSION
"\n");
335 dbg("Failure to register service\n");
339 device_initcall(pcied_init
);