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
;
116 } else if (ctrl
->pcie
->port
->hotplug_user_indicators
) {
117 ops
->get_attention_status
= pciehp_get_raw_indicator_status
;
118 ops
->set_attention_status
= pciehp_set_raw_indicator_status
;
121 /* register this slot with the hotplug pci core */
122 hotplug
->info
= info
;
123 hotplug
->private = slot
;
124 hotplug
->release
= &release_slot
;
126 slot
->hotplug_slot
= hotplug
;
127 snprintf(name
, SLOT_NAME_SIZE
, "%u", PSN(ctrl
));
129 retval
= pci_hp_register(hotplug
,
130 ctrl
->pcie
->port
->subordinate
, 0, name
);
132 ctrl_err(ctrl
, "pci_hp_register failed: error %d\n", retval
);
142 static void cleanup_slot(struct controller
*ctrl
)
144 pci_hp_deregister(ctrl
->slot
->hotplug_slot
);
148 * set_attention_status - Turns the Amber LED for a slot on, off or blink
150 static int set_attention_status(struct hotplug_slot
*hotplug_slot
, u8 status
)
152 struct slot
*slot
= hotplug_slot
->private;
154 pciehp_set_attention_status(slot
, status
);
159 static int enable_slot(struct hotplug_slot
*hotplug_slot
)
161 struct slot
*slot
= hotplug_slot
->private;
163 return pciehp_sysfs_enable_slot(slot
);
167 static int disable_slot(struct hotplug_slot
*hotplug_slot
)
169 struct slot
*slot
= hotplug_slot
->private;
171 return pciehp_sysfs_disable_slot(slot
);
174 static int get_power_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
176 struct slot
*slot
= hotplug_slot
->private;
178 pciehp_get_power_status(slot
, value
);
182 static int get_attention_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
184 struct slot
*slot
= hotplug_slot
->private;
186 pciehp_get_attention_status(slot
, value
);
190 static int get_latch_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
192 struct slot
*slot
= hotplug_slot
->private;
194 pciehp_get_latch_status(slot
, value
);
198 static int get_adapter_status(struct hotplug_slot
*hotplug_slot
, u8
*value
)
200 struct slot
*slot
= hotplug_slot
->private;
202 pciehp_get_adapter_status(slot
, value
);
206 static int reset_slot(struct hotplug_slot
*hotplug_slot
, int probe
)
208 struct slot
*slot
= hotplug_slot
->private;
210 return pciehp_reset_slot(slot
, probe
);
213 static int pciehp_probe(struct pcie_device
*dev
)
216 struct controller
*ctrl
;
218 u8 occupied
, poweron
;
220 /* If this is not a "hotplug" service, we have no business here. */
221 if (dev
->service
!= PCIE_PORT_SERVICE_HP
)
224 if (!dev
->port
->subordinate
) {
225 /* Can happen if we run out of bus numbers during probe */
226 dev_err(&dev
->device
,
227 "Hotplug bridge without secondary bus, ignoring\n");
231 ctrl
= pcie_init(dev
);
233 dev_err(&dev
->device
, "Controller initialization failed\n");
236 set_service_data(dev
, ctrl
);
238 /* Setup the slot information structures */
239 rc
= init_slot(ctrl
);
242 ctrl_warn(ctrl
, "Slot already registered by another hotplug driver\n");
244 ctrl_err(ctrl
, "Slot initialization failed (%d)\n", rc
);
245 goto err_out_release_ctlr
;
248 /* Enable events after we have setup the data structures */
249 rc
= pcie_init_notification(ctrl
);
251 ctrl_err(ctrl
, "Notification initialization failed (%d)\n", rc
);
252 goto err_out_free_ctrl_slot
;
255 /* Check if slot is occupied */
257 pciehp_get_adapter_status(slot
, &occupied
);
258 pciehp_get_power_status(slot
, &poweron
);
259 if (occupied
&& pciehp_force
) {
260 mutex_lock(&slot
->hotplug_lock
);
261 pciehp_enable_slot(slot
);
262 mutex_unlock(&slot
->hotplug_lock
);
264 /* If empty slot's power status is on, turn power off */
265 if (!occupied
&& poweron
&& POWER_CTRL(ctrl
))
266 pciehp_power_off_slot(slot
);
270 err_out_free_ctrl_slot
:
272 err_out_release_ctlr
:
273 pciehp_release_ctrl(ctrl
);
277 static void pciehp_remove(struct pcie_device
*dev
)
279 struct controller
*ctrl
= get_service_data(dev
);
282 pciehp_release_ctrl(ctrl
);
286 static int pciehp_suspend(struct pcie_device
*dev
)
291 static int pciehp_resume(struct pcie_device
*dev
)
293 struct controller
*ctrl
;
297 ctrl
= get_service_data(dev
);
299 /* reinitialize the chipset's event detection logic */
300 pcie_enable_notification(ctrl
);
304 /* Check if slot is occupied */
305 pciehp_get_adapter_status(slot
, &status
);
306 mutex_lock(&slot
->hotplug_lock
);
308 pciehp_enable_slot(slot
);
310 pciehp_disable_slot(slot
);
311 mutex_unlock(&slot
->hotplug_lock
);
316 static struct pcie_port_service_driver hpdriver_portdrv
= {
317 .name
= PCIE_MODULE_NAME
,
318 .port_type
= PCIE_ANY_PORT
,
319 .service
= PCIE_PORT_SERVICE_HP
,
321 .probe
= pciehp_probe
,
322 .remove
= pciehp_remove
,
325 .suspend
= pciehp_suspend
,
326 .resume
= pciehp_resume
,
330 static int __init
pcied_init(void)
334 retval
= pcie_port_service_register(&hpdriver_portdrv
);
335 dbg("pcie_port_service_register = %d\n", retval
);
336 info(DRIVER_DESC
" version: " DRIVER_VERSION
"\n");
338 dbg("Failure to register service\n");
342 device_initcall(pcied_init
);