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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / pci / hotplug / sgi_hotplug.c
blob8aebe1e9d3d6ae21c664f998a4192194547b7afe
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2005-2006 Silicon Graphics, Inc. All rights reserved.
7 *
8 * This work was based on the 2.4/2.6 kernel development by Dick Reigner.
9 * Work to add BIOS PROM support was completed by Mike Habeck.
10 */
11
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/pci.h>
16 #include <linux/pci_hotplug.h>
17 #include <linux/proc_fs.h>
18 #include <linux/types.h>
19 #include <linux/mutex.h>
20
21 #include <asm/sn/addrs.h>
22 #include <asm/sn/geo.h>
23 #include <asm/sn/l1.h>
24 #include <asm/sn/module.h>
25 #include <asm/sn/pcibr_provider.h>
26 #include <asm/sn/pcibus_provider_defs.h>
27 #include <asm/sn/pcidev.h>
28 #include <asm/sn/sn_feature_sets.h>
29 #include <asm/sn/sn_sal.h>
30 #include <asm/sn/types.h>
31 #include <linux/acpi.h>
32 #include <asm/sn/acpi.h>
33
34 #include "../pci.h"
35
36 MODULE_LICENSE("GPL");
37 MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
38 MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
39
40
41 /* SAL call error codes. Keep in sync with prom header io/include/pcibr.h */
42 #define PCI_SLOT_ALREADY_UP 2 /* slot already up */
43 #define PCI_SLOT_ALREADY_DOWN 3 /* slot already down */
44 #define PCI_L1_ERR 7 /* L1 console command error */
45 #define PCI_EMPTY_33MHZ 15 /* empty 33 MHz bus */
46
47
48 #define PCIIO_ASIC_TYPE_TIOCA 4
49 #define PCI_L1_QSIZE 128 /* our L1 message buffer size */
50 #define SN_MAX_HP_SLOTS 32 /* max hotplug slots */
51 #define SN_SLOT_NAME_SIZE 33 /* size of name string */
52
53 /* internal list head */
54 static struct list_head sn_hp_list;
55
56 /* hotplug_slot struct's private pointer */
57 struct slot {
58 int device_num;
59 struct pci_bus *pci_bus;
60 /* this struct for glue internal only */
61 struct hotplug_slot *hotplug_slot;
62 struct list_head hp_list;
63 char physical_path[SN_SLOT_NAME_SIZE];
64 };
65
66 struct pcibr_slot_enable_resp {
67 int resp_sub_errno;
68 char resp_l1_msg[PCI_L1_QSIZE + 1];
69 };
70
71 struct pcibr_slot_disable_resp {
72 int resp_sub_errno;
73 char resp_l1_msg[PCI_L1_QSIZE + 1];
74 };
75
76 enum sn_pci_req_e {
77 PCI_REQ_SLOT_ELIGIBLE,
78 PCI_REQ_SLOT_DISABLE
79 };
80
81 static int enable_slot(struct hotplug_slot *slot);
82 static int disable_slot(struct hotplug_slot *slot);
83 static inline int get_power_status(struct hotplug_slot *slot, u8 *value);
84
85 static struct hotplug_slot_ops sn_hotplug_slot_ops = {
86 .enable_slot = enable_slot,
87 .disable_slot = disable_slot,
88 .get_power_status = get_power_status,
89 };
90
91 static DEFINE_MUTEX(sn_hotplug_mutex);
92
93 static ssize_t path_show(struct pci_slot *pci_slot, char *buf)
94 {
95 int retval = -ENOENT;
96 struct slot *slot = pci_slot->hotplug->private;
97
98 if (!slot)
99 return retval;
100
101 retval = sprintf (buf, "%s\n", slot->physical_path);
102 return retval;
103 }
104
105 static struct pci_slot_attribute sn_slot_path_attr = __ATTR_RO(path);
106
107 static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
108 {
109 struct pcibus_info *pcibus_info;
110 u16 busnum, segment, ioboard_type;
111
112 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
113
114 /* Check to see if this is a valid slot on 'pci_bus' */
115 if (!(pcibus_info->pbi_valid_devices & (1 << device)))
116 return -EPERM;
117
118 ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
119 busnum = pcibus_info->pbi_buscommon.bs_persist_busnum;
120 segment = pci_domain_nr(pci_bus) & 0xf;
121
122 /* Do not allow hotplug operations on base I/O cards */
123 if ((ioboard_type == L1_BRICKTYPE_IX ||
124 ioboard_type == L1_BRICKTYPE_IA) &&
125 (segment == 1 && busnum == 0 && device != 1))
126 return -EPERM;
127
128 return 1;
129 }
130
131 static int sn_pci_bus_valid(struct pci_bus *pci_bus)
132 {
133 struct pcibus_info *pcibus_info;
134 u32 asic_type;
135 u16 ioboard_type;
136
137 /* Don't register slots hanging off the TIOCA bus */
138 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
139 asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
140 if (asic_type == PCIIO_ASIC_TYPE_TIOCA)
141 return -EPERM;
142
143 /* Only register slots in I/O Bricks that support hotplug */
144 ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
145 switch (ioboard_type) {
146 case L1_BRICKTYPE_IX:
147 case L1_BRICKTYPE_PX:
148 case L1_BRICKTYPE_IA:
149 case L1_BRICKTYPE_PA:
150 case L1_BOARDTYPE_PCIX3SLOT:
151 return 1;
152 break;
153 default:
154 return -EPERM;
155 break;
156 }
157
158 return -EIO;
159 }
160
161 static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
162 struct pci_bus *pci_bus, int device,
163 char *name)
164 {
165 struct pcibus_info *pcibus_info;
166 struct slot *slot;
167
168 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
169
170 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
171 if (!slot)
172 return -ENOMEM;
173 bss_hotplug_slot->private = slot;
174
175 slot->device_num = device;
176 slot->pci_bus = pci_bus;
177 sprintf(name, "%04x:%02x:%02x",
178 pci_domain_nr(pci_bus),
179 ((u16)pcibus_info->pbi_buscommon.bs_persist_busnum),
180 device + 1);
181
182 sn_generate_path(pci_bus, slot->physical_path);
183
184 slot->hotplug_slot = bss_hotplug_slot;
185 list_add(&slot->hp_list, &sn_hp_list);
186
187 return 0;
188 }
189
190 static struct hotplug_slot * sn_hp_destroy(void)
191 {
192 struct slot *slot;
193 struct pci_slot *pci_slot;
194 struct hotplug_slot *bss_hotplug_slot = NULL;
195
196 list_for_each_entry(slot, &sn_hp_list, hp_list) {
197 bss_hotplug_slot = slot->hotplug_slot;
198 pci_slot = bss_hotplug_slot->pci_slot;
199 list_del(&((struct slot *)bss_hotplug_slot->private)->
200 hp_list);
201 sysfs_remove_file(&pci_slot->kobj,
202 &sn_slot_path_attr.attr);
203 break;
204 }
205 return bss_hotplug_slot;
206 }
207
208 static void sn_bus_free_data(struct pci_dev *dev)
209 {
210 struct pci_bus *subordinate_bus;
211 struct pci_dev *child;
212
213 /* Recursively clean up sn_irq_info structs */
214 if (dev->subordinate) {
215 subordinate_bus = dev->subordinate;
216 list_for_each_entry(child, &subordinate_bus->devices, bus_list)
217 sn_bus_free_data(child);
218 }
219 /*
220 * Some drivers may use dma accesses during the
221 * driver remove function. We release the sysdata
222 * areas after the driver remove functions have
223 * been called.
224 */
225 sn_bus_store_sysdata(dev);
226 sn_pci_unfixup_slot(dev);
227 }
228
229 static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
230 int device_num, char **ssdt)
231 {
232 struct slot *slot = bss_hotplug_slot->private;
233 struct pcibus_info *pcibus_info;
234 struct pcibr_slot_enable_resp resp;
235 int rc;
236
237 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
238
239 /*
240 * Power-on and initialize the slot in the SN
241 * PCI infrastructure.
242 */
243 rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp, ssdt);
244
245
246 if (rc == PCI_SLOT_ALREADY_UP) {
247 dev_dbg(&slot->pci_bus->self->dev, "is already active\n");
248 return 1; /* return 1 to user */
249 }
250
251 if (rc == PCI_L1_ERR) {
252 dev_dbg(&slot->pci_bus->self->dev,
253 "L1 failure %d with message: %s",
254 resp.resp_sub_errno, resp.resp_l1_msg);
255 return -EPERM;
256 }
257
258 if (rc) {
259 dev_dbg(&slot->pci_bus->self->dev,
260 "insert failed with error %d sub-error %d\n",
261 rc, resp.resp_sub_errno);
262 return -EIO;
263 }
264
265 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
266 pcibus_info->pbi_enabled_devices |= (1 << device_num);
267
268 return 0;
269 }
270
271 static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
272 int device_num, int action)
273 {
274 struct slot *slot = bss_hotplug_slot->private;
275 struct pcibus_info *pcibus_info;
276 struct pcibr_slot_disable_resp resp;
277 int rc;
278
279 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
280
281 rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
282
283 if ((action == PCI_REQ_SLOT_ELIGIBLE) &&
284 (rc == PCI_SLOT_ALREADY_DOWN)) {
285 dev_dbg(&slot->pci_bus->self->dev, "Slot %s already inactive\n", slot->physical_path);
286 return 1; /* return 1 to user */
287 }
288
289 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_EMPTY_33MHZ)) {
290 dev_dbg(&slot->pci_bus->self->dev,
291 "Cannot remove last 33MHz card\n");
292 return -EPERM;
293 }
294
295 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_L1_ERR)) {
296 dev_dbg(&slot->pci_bus->self->dev,
297 "L1 failure %d with message \n%s\n",
298 resp.resp_sub_errno, resp.resp_l1_msg);
299 return -EPERM;
300 }
301
302 if ((action == PCI_REQ_SLOT_ELIGIBLE) && rc) {
303 dev_dbg(&slot->pci_bus->self->dev,
304 "remove failed with error %d sub-error %d\n",
305 rc, resp.resp_sub_errno);
306 return -EIO;
307 }
308
309 if ((action == PCI_REQ_SLOT_ELIGIBLE) && !rc)
310 return 0;
311
312 if ((action == PCI_REQ_SLOT_DISABLE) && !rc) {
313 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
314 pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
315 dev_dbg(&slot->pci_bus->self->dev, "remove successful\n");
316 return 0;
317 }
318
319 if ((action == PCI_REQ_SLOT_DISABLE) && rc) {
320 dev_dbg(&slot->pci_bus->self->dev,"remove failed rc = %d\n", rc);
321 }
322
323 return rc;
324 }
325
326 /*
327 * Power up and configure the slot via a SAL call to PROM.
328 * Scan slot (and any children), do any platform specific fixup,
329 * and find device driver.
330 */
331 static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
332 {
333 struct slot *slot = bss_hotplug_slot->private;
334 struct pci_bus *new_bus = NULL;
335 struct pci_dev *dev;
336 int func, num_funcs;
337 int new_ppb = 0;
338 int rc;
339 char *ssdt = NULL;
340 void pcibios_fixup_device_resources(struct pci_dev *);
341
342 /* Serialize the Linux PCI infrastructure */
343 mutex_lock(&sn_hotplug_mutex);
344
345 /*
346 * Power-on and initialize the slot in the SN
347 * PCI infrastructure. Also, retrieve the ACPI SSDT
348 * table for the slot (if ACPI capable PROM).
349 */
350 rc = sn_slot_enable(bss_hotplug_slot, slot->device_num, &ssdt);
351 if (rc) {
352 mutex_unlock(&sn_hotplug_mutex);
353 return rc;
354 }
355
356 if (ssdt)
357 ssdt = __va(ssdt);
358 /* Add the new SSDT for the slot to the ACPI namespace */
359 if (SN_ACPI_BASE_SUPPORT() && ssdt) {
360 acpi_status ret;
361
362 ret = acpi_load_table((struct acpi_table_header *)ssdt);
363 if (ACPI_FAILURE(ret)) {
364 printk(KERN_ERR "%s: acpi_load_table failed (0x%x)\n",
365 __func__, ret);
366 /* try to continue on */
367 }
368 }
369
370 num_funcs = pci_scan_slot(slot->pci_bus,
371 PCI_DEVFN(slot->device_num + 1, 0));
372 if (!num_funcs) {
373 dev_dbg(&slot->pci_bus->self->dev, "no device in slot\n");
374 mutex_unlock(&sn_hotplug_mutex);
375 return -ENODEV;
376 }
377
378 /*
379 * Map SN resources for all functions on the card
380 * to the Linux PCI interface and tell the drivers
381 * about them.
382 */
383 for (func = 0; func < num_funcs; func++) {
384 dev = pci_get_slot(slot->pci_bus,
385 PCI_DEVFN(slot->device_num + 1,
386 PCI_FUNC(func)));
387 if (dev) {
388 /* Need to do slot fixup on PPB before fixup of children
389 * (PPB's pcidev_info needs to be in pcidev_info list
390 * before child's SN_PCIDEV_INFO() call to setup
391 * pdi_host_pcidev_info).
392 */
393 pcibios_fixup_device_resources(dev);
394 if (SN_ACPI_BASE_SUPPORT())
395 sn_acpi_slot_fixup(dev);
396 else
397 sn_io_slot_fixup(dev);
398 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
399 unsigned char sec_bus;
400 pci_read_config_byte(dev, PCI_SECONDARY_BUS,
401 &sec_bus);
402 new_bus = pci_add_new_bus(dev->bus, dev,
403 sec_bus);
404 pci_scan_child_bus(new_bus);
405 new_ppb = 1;
406 }
407 pci_dev_put(dev);
408 }
409 }
410
411 /*
412 * Add the slot's devices to the ACPI infrastructure */
413 if (SN_ACPI_BASE_SUPPORT() && ssdt) {
414 unsigned long long adr;
415 struct acpi_device *pdevice;
416 struct acpi_device *device;
417 acpi_handle phandle;
418 acpi_handle chandle = NULL;
419 acpi_handle rethandle;
420 acpi_status ret;
421
422 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
423
424 if (acpi_bus_get_device(phandle, &pdevice)) {
425 dev_dbg(&slot->pci_bus->self->dev,
426 "no parent device, assuming NULL\n");
427 pdevice = NULL;
428 }
429
430 /*
431 * Walk the rootbus node's immediate children looking for
432 * the slot's device node(s). There can be more than
433 * one for multifunction devices.
434 */
435 for (;;) {
436 rethandle = NULL;
437 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
438 phandle, chandle,
439 &rethandle);
440
441 if (ret == AE_NOT_FOUND || rethandle == NULL)
442 break;
443
444 chandle = rethandle;
445
446 ret = acpi_evaluate_integer(chandle, METHOD_NAME__ADR,
447 NULL, &adr);
448
449 if (ACPI_SUCCESS(ret) &&
450 (adr>>16) == (slot->device_num + 1)) {
451
452 ret = acpi_bus_add(&device, pdevice, chandle,
453 ACPI_BUS_TYPE_DEVICE);
454 if (ACPI_FAILURE(ret)) {
455 printk(KERN_ERR "%s: acpi_bus_add "
456 "failed (0x%x) for slot %d "
457 "func %d\n", __func__,
458 ret, (int)(adr>>16),
459 (int)(adr&0xffff));
460 /* try to continue on */
461 } else {
462 acpi_bus_start(device);
463 }
464 }
465 }
466 }
467
468 /* Call the driver for the new device */
469 pci_bus_add_devices(slot->pci_bus);
470 /* Call the drivers for the new devices subordinate to PPB */
471 if (new_ppb)
472 pci_bus_add_devices(new_bus);
473
474 mutex_unlock(&sn_hotplug_mutex);
475
476 if (rc == 0)
477 dev_dbg(&slot->pci_bus->self->dev,
478 "insert operation successful\n");
479 else
480 dev_dbg(&slot->pci_bus->self->dev,
481 "insert operation failed rc = %d\n", rc);
482
483 return rc;
484 }
485
486 static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
487 {
488 struct slot *slot = bss_hotplug_slot->private;
489 struct pci_dev *dev;
490 int func;
491 int rc;
492 acpi_owner_id ssdt_id = 0;
493
494 /* Acquire update access to the bus */
495 mutex_lock(&sn_hotplug_mutex);
496
497 /* is it okay to bring this slot down? */
498 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
499 PCI_REQ_SLOT_ELIGIBLE);
500 if (rc)
501 goto leaving;
502
503 /* free the ACPI resources for the slot */
504 if (SN_ACPI_BASE_SUPPORT() &&
505 PCI_CONTROLLER(slot->pci_bus)->acpi_handle) {
506 unsigned long long adr;
507 struct acpi_device *device;
508 acpi_handle phandle;
509 acpi_handle chandle = NULL;
510 acpi_handle rethandle;
511 acpi_status ret;
512
513 /* Get the rootbus node pointer */
514 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
515
516 /*
517 * Walk the rootbus node's immediate children looking for
518 * the slot's device node(s). There can be more than
519 * one for multifunction devices.
520 */
521 for (;;) {
522 rethandle = NULL;
523 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
524 phandle, chandle,
525 &rethandle);
526
527 if (ret == AE_NOT_FOUND || rethandle == NULL)
528 break;
529
530 chandle = rethandle;
531
532 ret = acpi_evaluate_integer(chandle,
533 METHOD_NAME__ADR,
534 NULL, &adr);
535 if (ACPI_SUCCESS(ret) &&
536 (adr>>16) == (slot->device_num + 1)) {
537 /* retain the owner id */
538 acpi_get_id(chandle, &ssdt_id);
539
540 ret = acpi_bus_get_device(chandle,
541 &device);
542 if (ACPI_SUCCESS(ret))
543 acpi_bus_trim(device, 1);
544 }
545 }
546
547 }
548
549 /* Free the SN resources assigned to the Linux device.*/
550 for (func = 0; func < 8; func++) {
551 dev = pci_get_slot(slot->pci_bus,
552 PCI_DEVFN(slot->device_num + 1,
553 PCI_FUNC(func)));
554 if (dev) {
555 sn_bus_free_data(dev);
556 pci_remove_bus_device(dev);
557 pci_dev_put(dev);
558 }
559 }
560
561 /* Remove the SSDT for the slot from the ACPI namespace */
562 if (SN_ACPI_BASE_SUPPORT() && ssdt_id) {
563 acpi_status ret;
564 ret = acpi_unload_table_id(ssdt_id);
565 if (ACPI_FAILURE(ret)) {
566 printk(KERN_ERR "%s: acpi_unload_table_id "
567 "failed (0x%x) for id %d\n",
568 __func__, ret, ssdt_id);
569 /* try to continue on */
570 }
571 }
572
573 /* free the collected sysdata pointers */
574 sn_bus_free_sysdata();
575
576 /* Deactivate slot */
577 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
578 PCI_REQ_SLOT_DISABLE);
579 leaving:
580 /* Release the bus lock */
581 mutex_unlock(&sn_hotplug_mutex);
582
583 return rc;
584 }
585
586 static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot,
587 u8 *value)
588 {
589 struct slot *slot = bss_hotplug_slot->private;
590 struct pcibus_info *pcibus_info;
591 u32 power;
592
593 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
594 mutex_lock(&sn_hotplug_mutex);
595 power = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
596 *value = power ? 1 : 0;
597 mutex_unlock(&sn_hotplug_mutex);
598 return 0;
599 }
600
601 static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
602 {
603 kfree(bss_hotplug_slot->info);
604 kfree(bss_hotplug_slot->private);
605 kfree(bss_hotplug_slot);
606 }
607
608 static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
609 {
610 int device;
611 struct pci_slot *pci_slot;
612 struct hotplug_slot *bss_hotplug_slot;
613 char name[SN_SLOT_NAME_SIZE];
614 int rc = 0;
615
616 /*
617 * Currently only four devices are supported,
618 * in the future there maybe more -- up to 32.
619 */
620
621 for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
622 if (sn_pci_slot_valid(pci_bus, device) != 1)
623 continue;
624
625 bss_hotplug_slot = kzalloc(sizeof(*bss_hotplug_slot),
626 GFP_KERNEL);
627 if (!bss_hotplug_slot) {
628 rc = -ENOMEM;
629 goto alloc_err;
630 }
631
632 bss_hotplug_slot->info =
633 kzalloc(sizeof(struct hotplug_slot_info),
634 GFP_KERNEL);
635 if (!bss_hotplug_slot->info) {
636 rc = -ENOMEM;
637 goto alloc_err;
638 }
639
640 if (sn_hp_slot_private_alloc(bss_hotplug_slot,
641 pci_bus, device, name)) {
642 rc = -ENOMEM;
643 goto alloc_err;
644 }
645 bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
646 bss_hotplug_slot->release = &sn_release_slot;
647
648 rc = pci_hp_register(bss_hotplug_slot, pci_bus, device, name);
649 if (rc)
650 goto register_err;
651
652 pci_slot = bss_hotplug_slot->pci_slot;
653 rc = sysfs_create_file(&pci_slot->kobj,
654 &sn_slot_path_attr.attr);
655 if (rc)
656 goto register_err;
657 }
658 dev_dbg(&pci_bus->self->dev, "Registered bus with hotplug\n");
659 return rc;
660
661 register_err:
662 dev_dbg(&pci_bus->self->dev, "bus failed to register with err = %d\n",
663 rc);
664
665 alloc_err:
666 if (rc == -ENOMEM)
667 dev_dbg(&pci_bus->self->dev, "Memory allocation error\n");
668
669 /* destroy THIS element */
670 if (bss_hotplug_slot)
671 sn_release_slot(bss_hotplug_slot);
672
673 /* destroy anything else on the list */
674 while ((bss_hotplug_slot = sn_hp_destroy()))
675 pci_hp_deregister(bss_hotplug_slot);
676
677 return rc;
678 }
679
680 static int __init sn_pci_hotplug_init(void)
681 {
682 struct pci_bus *pci_bus = NULL;
683 int rc;
684 int registered = 0;
685
686 if (!sn_prom_feature_available(PRF_HOTPLUG_SUPPORT)) {
687 printk(KERN_ERR "%s: PROM version does not support hotplug.\n",
688 __func__);
689 return -EPERM;
690 }
691
692 INIT_LIST_HEAD(&sn_hp_list);
693
694 while ((pci_bus = pci_find_next_bus(pci_bus))) {
695 if (!pci_bus->sysdata)
696 continue;
697
698 rc = sn_pci_bus_valid(pci_bus);
699 if (rc != 1) {
700 dev_dbg(&pci_bus->self->dev, "not a valid hotplug bus\n");
701 continue;
702 }
703 dev_dbg(&pci_bus->self->dev, "valid hotplug bus\n");
704
705 rc = sn_hotplug_slot_register(pci_bus);
706 if (!rc) {
707 registered = 1;
708 } else {
709 registered = 0;
710 break;
711 }
712 }
713
714 return registered == 1 ? 0 : -ENODEV;
715 }
716
717 static void __exit sn_pci_hotplug_exit(void)
718 {
719 struct hotplug_slot *bss_hotplug_slot;
720
721 while ((bss_hotplug_slot = sn_hp_destroy()))
722 pci_hp_deregister(bss_hotplug_slot);
723
724 if (!list_empty(&sn_hp_list))
725 printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
726 }
727
728 module_init(sn_pci_hotplug_init);
729 module_exit(sn_pci_hotplug_exit);