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V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / drivers / pci / hotplug / sgi_hotplug.c
blobef07c36bccf7ea1b4868853080ce6717e7818233
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 .owner = THIS_MODULE,
87 .enable_slot = enable_slot,
88 .disable_slot = disable_slot,
89 .get_power_status = get_power_status,
90 };
91
92 static DEFINE_MUTEX(sn_hotplug_mutex);
93
94 static ssize_t path_show (struct hotplug_slot *bss_hotplug_slot,
95 char *buf)
96 {
97 int retval = -ENOENT;
98 struct slot *slot = bss_hotplug_slot->private;
99
100 if (!slot)
101 return retval;
102
103 retval = sprintf (buf, "%s\n", slot->physical_path);
104 return retval;
105 }
106
107 static struct hotplug_slot_attribute sn_slot_path_attr = __ATTR_RO(path);
108
109 static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
110 {
111 struct pcibus_info *pcibus_info;
112 u16 busnum, segment, ioboard_type;
113
114 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
115
116 /* Check to see if this is a valid slot on 'pci_bus' */
117 if (!(pcibus_info->pbi_valid_devices & (1 << device)))
118 return -EPERM;
119
120 ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
121 busnum = pcibus_info->pbi_buscommon.bs_persist_busnum;
122 segment = pci_domain_nr(pci_bus) & 0xf;
123
124 /* Do not allow hotplug operations on base I/O cards */
125 if ((ioboard_type == L1_BRICKTYPE_IX ||
126 ioboard_type == L1_BRICKTYPE_IA) &&
127 (segment == 1 && busnum == 0 && device != 1))
128 return -EPERM;
129
130 return 1;
131 }
132
133 static int sn_pci_bus_valid(struct pci_bus *pci_bus)
134 {
135 struct pcibus_info *pcibus_info;
136 u32 asic_type;
137 u16 ioboard_type;
138
139 /* Don't register slots hanging off the TIOCA bus */
140 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
141 asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
142 if (asic_type == PCIIO_ASIC_TYPE_TIOCA)
143 return -EPERM;
144
145 /* Only register slots in I/O Bricks that support hotplug */
146 ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
147 switch (ioboard_type) {
148 case L1_BRICKTYPE_IX:
149 case L1_BRICKTYPE_PX:
150 case L1_BRICKTYPE_IA:
151 case L1_BRICKTYPE_PA:
152 case L1_BOARDTYPE_PCIX3SLOT:
153 return 1;
154 break;
155 default:
156 return -EPERM;
157 break;
158 }
159
160 return -EIO;
161 }
162
163 static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
164 struct pci_bus *pci_bus, int device)
165 {
166 struct pcibus_info *pcibus_info;
167 struct slot *slot;
168
169 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
170
171 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
172 if (!slot)
173 return -ENOMEM;
174 bss_hotplug_slot->private = slot;
175
176 bss_hotplug_slot->name = kmalloc(SN_SLOT_NAME_SIZE, GFP_KERNEL);
177 if (!bss_hotplug_slot->name) {
178 kfree(bss_hotplug_slot->private);
179 return -ENOMEM;
180 }
181
182 slot->device_num = device;
183 slot->pci_bus = pci_bus;
184 sprintf(bss_hotplug_slot->name, "%04x:%02x:%02x",
185 pci_domain_nr(pci_bus),
186 ((u16)pcibus_info->pbi_buscommon.bs_persist_busnum),
187 device + 1);
188
189 sn_generate_path(pci_bus, slot->physical_path);
190
191 slot->hotplug_slot = bss_hotplug_slot;
192 list_add(&slot->hp_list, &sn_hp_list);
193
194 return 0;
195 }
196
197 static struct hotplug_slot * sn_hp_destroy(void)
198 {
199 struct slot *slot;
200 struct hotplug_slot *bss_hotplug_slot = NULL;
201
202 list_for_each_entry(slot, &sn_hp_list, hp_list) {
203 bss_hotplug_slot = slot->hotplug_slot;
204 list_del(&((struct slot *)bss_hotplug_slot->private)->
205 hp_list);
206 sysfs_remove_file(&bss_hotplug_slot->kobj,
207 &sn_slot_path_attr.attr);
208 break;
209 }
210 return bss_hotplug_slot;
211 }
212
213 static void sn_bus_free_data(struct pci_dev *dev)
214 {
215 struct pci_bus *subordinate_bus;
216 struct pci_dev *child;
217
218 /* Recursively clean up sn_irq_info structs */
219 if (dev->subordinate) {
220 subordinate_bus = dev->subordinate;
221 list_for_each_entry(child, &subordinate_bus->devices, bus_list)
222 sn_bus_free_data(child);
223 }
224 /*
225 * Some drivers may use dma accesses during the
226 * driver remove function. We release the sysdata
227 * areas after the driver remove functions have
228 * been called.
229 */
230 sn_bus_store_sysdata(dev);
231 sn_pci_unfixup_slot(dev);
232 }
233
234 static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
235 int device_num, char **ssdt)
236 {
237 struct slot *slot = bss_hotplug_slot->private;
238 struct pcibus_info *pcibus_info;
239 struct pcibr_slot_enable_resp resp;
240 int rc;
241
242 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
243
244 /*
245 * Power-on and initialize the slot in the SN
246 * PCI infrastructure.
247 */
248 rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp, ssdt);
249
250
251 if (rc == PCI_SLOT_ALREADY_UP) {
252 dev_dbg(&slot->pci_bus->self->dev, "is already active\n");
253 return 1; /* return 1 to user */
254 }
255
256 if (rc == PCI_L1_ERR) {
257 dev_dbg(&slot->pci_bus->self->dev,
258 "L1 failure %d with message: %s",
259 resp.resp_sub_errno, resp.resp_l1_msg);
260 return -EPERM;
261 }
262
263 if (rc) {
264 dev_dbg(&slot->pci_bus->self->dev,
265 "insert failed with error %d sub-error %d\n",
266 rc, resp.resp_sub_errno);
267 return -EIO;
268 }
269
270 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
271 pcibus_info->pbi_enabled_devices |= (1 << device_num);
272
273 return 0;
274 }
275
276 static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
277 int device_num, int action)
278 {
279 struct slot *slot = bss_hotplug_slot->private;
280 struct pcibus_info *pcibus_info;
281 struct pcibr_slot_disable_resp resp;
282 int rc;
283
284 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
285
286 rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
287
288 if ((action == PCI_REQ_SLOT_ELIGIBLE) &&
289 (rc == PCI_SLOT_ALREADY_DOWN)) {
290 dev_dbg(&slot->pci_bus->self->dev, "Slot %s already inactive\n", slot->physical_path);
291 return 1; /* return 1 to user */
292 }
293
294 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_EMPTY_33MHZ)) {
295 dev_dbg(&slot->pci_bus->self->dev,
296 "Cannot remove last 33MHz card\n");
297 return -EPERM;
298 }
299
300 if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_L1_ERR)) {
301 dev_dbg(&slot->pci_bus->self->dev,
302 "L1 failure %d with message \n%s\n",
303 resp.resp_sub_errno, resp.resp_l1_msg);
304 return -EPERM;
305 }
306
307 if ((action == PCI_REQ_SLOT_ELIGIBLE) && rc) {
308 dev_dbg(&slot->pci_bus->self->dev,
309 "remove failed with error %d sub-error %d\n",
310 rc, resp.resp_sub_errno);
311 return -EIO;
312 }
313
314 if ((action == PCI_REQ_SLOT_ELIGIBLE) && !rc)
315 return 0;
316
317 if ((action == PCI_REQ_SLOT_DISABLE) && !rc) {
318 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
319 pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
320 dev_dbg(&slot->pci_bus->self->dev, "remove successful\n");
321 return 0;
322 }
323
324 if ((action == PCI_REQ_SLOT_DISABLE) && rc) {
325 dev_dbg(&slot->pci_bus->self->dev,"remove failed rc = %d\n", rc);
326 }
327
328 return rc;
329 }
330
331 /*
332 * Power up and configure the slot via a SAL call to PROM.
333 * Scan slot (and any children), do any platform specific fixup,
334 * and find device driver.
335 */
336 static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
337 {
338 struct slot *slot = bss_hotplug_slot->private;
339 struct pci_bus *new_bus = NULL;
340 struct pci_dev *dev;
341 int func, num_funcs;
342 int new_ppb = 0;
343 int rc;
344 char *ssdt = NULL;
345 void pcibios_fixup_device_resources(struct pci_dev *);
346
347 /* Serialize the Linux PCI infrastructure */
348 mutex_lock(&sn_hotplug_mutex);
349
350 /*
351 * Power-on and initialize the slot in the SN
352 * PCI infrastructure. Also, retrieve the ACPI SSDT
353 * table for the slot (if ACPI capable PROM).
354 */
355 rc = sn_slot_enable(bss_hotplug_slot, slot->device_num, &ssdt);
356 if (rc) {
357 mutex_unlock(&sn_hotplug_mutex);
358 return rc;
359 }
360
361 if (ssdt)
362 ssdt = __va(ssdt);
363 /* Add the new SSDT for the slot to the ACPI namespace */
364 if (SN_ACPI_BASE_SUPPORT() && ssdt) {
365 acpi_status ret;
366
367 ret = acpi_load_table((struct acpi_table_header *)ssdt);
368 if (ACPI_FAILURE(ret)) {
369 printk(KERN_ERR "%s: acpi_load_table failed (0x%x)\n",
370 __FUNCTION__, ret);
371 /* try to continue on */
372 }
373 }
374
375 num_funcs = pci_scan_slot(slot->pci_bus,
376 PCI_DEVFN(slot->device_num + 1, 0));
377 if (!num_funcs) {
378 dev_dbg(&slot->pci_bus->self->dev, "no device in slot\n");
379 mutex_unlock(&sn_hotplug_mutex);
380 return -ENODEV;
381 }
382
383 /*
384 * Map SN resources for all functions on the card
385 * to the Linux PCI interface and tell the drivers
386 * about them.
387 */
388 for (func = 0; func < num_funcs; func++) {
389 dev = pci_get_slot(slot->pci_bus,
390 PCI_DEVFN(slot->device_num + 1,
391 PCI_FUNC(func)));
392 if (dev) {
393 /* Need to do slot fixup on PPB before fixup of children
394 * (PPB's pcidev_info needs to be in pcidev_info list
395 * before child's SN_PCIDEV_INFO() call to setup
396 * pdi_host_pcidev_info).
397 */
398 pcibios_fixup_device_resources(dev);
399 if (SN_ACPI_BASE_SUPPORT())
400 sn_acpi_slot_fixup(dev);
401 else
402 sn_io_slot_fixup(dev);
403 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
404 unsigned char sec_bus;
405 pci_read_config_byte(dev, PCI_SECONDARY_BUS,
406 &sec_bus);
407 new_bus = pci_add_new_bus(dev->bus, dev,
408 sec_bus);
409 pci_scan_child_bus(new_bus);
410 new_ppb = 1;
411 }
412 pci_dev_put(dev);
413 }
414 }
415
416 /*
417 * Add the slot's devices to the ACPI infrastructure */
418 if (SN_ACPI_BASE_SUPPORT() && ssdt) {
419 unsigned long adr;
420 struct acpi_device *pdevice;
421 struct acpi_device *device;
422 acpi_handle phandle;
423 acpi_handle chandle = NULL;
424 acpi_handle rethandle;
425 acpi_status ret;
426
427 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
428
429 if (acpi_bus_get_device(phandle, &pdevice)) {
430 dev_dbg(&slot->pci_bus->self->dev,
431 "no parent device, assuming NULL\n");
432 pdevice = NULL;
433 }
434
435 /*
436 * Walk the rootbus node's immediate children looking for
437 * the slot's device node(s). There can be more than
438 * one for multifunction devices.
439 */
440 for (;;) {
441 rethandle = NULL;
442 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
443 phandle, chandle,
444 &rethandle);
445
446 if (ret == AE_NOT_FOUND || rethandle == NULL)
447 break;
448
449 chandle = rethandle;
450
451 ret = acpi_evaluate_integer(chandle, METHOD_NAME__ADR,
452 NULL, &adr);
453
454 if (ACPI_SUCCESS(ret) &&
455 (adr>>16) == (slot->device_num + 1)) {
456
457 ret = acpi_bus_add(&device, pdevice, chandle,
458 ACPI_BUS_TYPE_DEVICE);
459 if (ACPI_FAILURE(ret)) {
460 printk(KERN_ERR "%s: acpi_bus_add "
461 "failed (0x%x) for slot %d "
462 "func %d\n", __FUNCTION__,
463 ret, (int)(adr>>16),
464 (int)(adr&0xffff));
465 /* try to continue on */
466 } else {
467 acpi_bus_start(device);
468 }
469 }
470 }
471 }
472
473 /* Call the driver for the new device */
474 pci_bus_add_devices(slot->pci_bus);
475 /* Call the drivers for the new devices subordinate to PPB */
476 if (new_ppb)
477 pci_bus_add_devices(new_bus);
478
479 mutex_unlock(&sn_hotplug_mutex);
480
481 if (rc == 0)
482 dev_dbg(&slot->pci_bus->self->dev,
483 "insert operation successful\n");
484 else
485 dev_dbg(&slot->pci_bus->self->dev,
486 "insert operation failed rc = %d\n", rc);
487
488 return rc;
489 }
490
491 static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
492 {
493 struct slot *slot = bss_hotplug_slot->private;
494 struct pci_dev *dev;
495 int func;
496 int rc;
497 acpi_owner_id ssdt_id = 0;
498
499 /* Acquire update access to the bus */
500 mutex_lock(&sn_hotplug_mutex);
501
502 /* is it okay to bring this slot down? */
503 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
504 PCI_REQ_SLOT_ELIGIBLE);
505 if (rc)
506 goto leaving;
507
508 /* free the ACPI resources for the slot */
509 if (SN_ACPI_BASE_SUPPORT() &&
510 PCI_CONTROLLER(slot->pci_bus)->acpi_handle) {
511 unsigned long adr;
512 struct acpi_device *device;
513 acpi_handle phandle;
514 acpi_handle chandle = NULL;
515 acpi_handle rethandle;
516 acpi_status ret;
517
518 /* Get the rootbus node pointer */
519 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
520
521 /*
522 * Walk the rootbus node's immediate children looking for
523 * the slot's device node(s). There can be more than
524 * one for multifunction devices.
525 */
526 for (;;) {
527 rethandle = NULL;
528 ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
529 phandle, chandle,
530 &rethandle);
531
532 if (ret == AE_NOT_FOUND || rethandle == NULL)
533 break;
534
535 chandle = rethandle;
536
537 ret = acpi_evaluate_integer(chandle,
538 METHOD_NAME__ADR,
539 NULL, &adr);
540 if (ACPI_SUCCESS(ret) &&
541 (adr>>16) == (slot->device_num + 1)) {
542 /* retain the owner id */
543 acpi_get_id(chandle, &ssdt_id);
544
545 ret = acpi_bus_get_device(chandle,
546 &device);
547 if (ACPI_SUCCESS(ret))
548 acpi_bus_trim(device, 1);
549 }
550 }
551
552 }
553
554 /* Free the SN resources assigned to the Linux device.*/
555 for (func = 0; func < 8; func++) {
556 dev = pci_get_slot(slot->pci_bus,
557 PCI_DEVFN(slot->device_num + 1,
558 PCI_FUNC(func)));
559 if (dev) {
560 sn_bus_free_data(dev);
561 pci_remove_bus_device(dev);
562 pci_dev_put(dev);
563 }
564 }
565
566 /* Remove the SSDT for the slot from the ACPI namespace */
567 if (SN_ACPI_BASE_SUPPORT() && ssdt_id) {
568 acpi_status ret;
569 ret = acpi_unload_table_id(ssdt_id);
570 if (ACPI_FAILURE(ret)) {
571 printk(KERN_ERR "%s: acpi_unload_table_id "
572 "failed (0x%x) for id %d\n",
573 __FUNCTION__, ret, ssdt_id);
574 /* try to continue on */
575 }
576 }
577
578 /* free the collected sysdata pointers */
579 sn_bus_free_sysdata();
580
581 /* Deactivate slot */
582 rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
583 PCI_REQ_SLOT_DISABLE);
584 leaving:
585 /* Release the bus lock */
586 mutex_unlock(&sn_hotplug_mutex);
587
588 return rc;
589 }
590
591 static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot,
592 u8 *value)
593 {
594 struct slot *slot = bss_hotplug_slot->private;
595 struct pcibus_info *pcibus_info;
596 u32 power;
597
598 pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
599 mutex_lock(&sn_hotplug_mutex);
600 power = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
601 *value = power ? 1 : 0;
602 mutex_unlock(&sn_hotplug_mutex);
603 return 0;
604 }
605
606 static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
607 {
608 kfree(bss_hotplug_slot->info);
609 kfree(bss_hotplug_slot->name);
610 kfree(bss_hotplug_slot->private);
611 kfree(bss_hotplug_slot);
612 }
613
614 static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
615 {
616 int device;
617 struct hotplug_slot *bss_hotplug_slot;
618 int rc = 0;
619
620 /*
621 * Currently only four devices are supported,
622 * in the future there maybe more -- up to 32.
623 */
624
625 for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
626 if (sn_pci_slot_valid(pci_bus, device) != 1)
627 continue;
628
629 bss_hotplug_slot = kzalloc(sizeof(*bss_hotplug_slot),
630 GFP_KERNEL);
631 if (!bss_hotplug_slot) {
632 rc = -ENOMEM;
633 goto alloc_err;
634 }
635
636 bss_hotplug_slot->info =
637 kzalloc(sizeof(struct hotplug_slot_info),
638 GFP_KERNEL);
639 if (!bss_hotplug_slot->info) {
640 rc = -ENOMEM;
641 goto alloc_err;
642 }
643
644 if (sn_hp_slot_private_alloc(bss_hotplug_slot,
645 pci_bus, device)) {
646 rc = -ENOMEM;
647 goto alloc_err;
648 }
649
650 bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
651 bss_hotplug_slot->release = &sn_release_slot;
652
653 rc = pci_hp_register(bss_hotplug_slot);
654 if (rc)
655 goto register_err;
656
657 rc = sysfs_create_file(&bss_hotplug_slot->kobj,
658 &sn_slot_path_attr.attr);
659 if (rc)
660 goto register_err;
661 }
662 dev_dbg(&pci_bus->self->dev, "Registered bus with hotplug\n");
663 return rc;
664
665 register_err:
666 dev_dbg(&pci_bus->self->dev, "bus failed to register with err = %d\n",
667 rc);
668
669 alloc_err:
670 if (rc == -ENOMEM)
671 dev_dbg(&pci_bus->self->dev, "Memory allocation error\n");
672
673 /* destroy THIS element */
674 if (bss_hotplug_slot)
675 sn_release_slot(bss_hotplug_slot);
676
677 /* destroy anything else on the list */
678 while ((bss_hotplug_slot = sn_hp_destroy()))
679 pci_hp_deregister(bss_hotplug_slot);
680
681 return rc;
682 }
683
684 static int sn_pci_hotplug_init(void)
685 {
686 struct pci_bus *pci_bus = NULL;
687 int rc;
688 int registered = 0;
689
690 if (!sn_prom_feature_available(PRF_HOTPLUG_SUPPORT)) {
691 printk(KERN_ERR "%s: PROM version does not support hotplug.\n",
692 __FUNCTION__);
693 return -EPERM;
694 }
695
696 INIT_LIST_HEAD(&sn_hp_list);
697
698 while ((pci_bus = pci_find_next_bus(pci_bus))) {
699 if (!pci_bus->sysdata)
700 continue;
701
702 rc = sn_pci_bus_valid(pci_bus);
703 if (rc != 1) {
704 dev_dbg(&pci_bus->self->dev, "not a valid hotplug bus\n");
705 continue;
706 }
707 dev_dbg(&pci_bus->self->dev, "valid hotplug bus\n");
708
709 rc = sn_hotplug_slot_register(pci_bus);
710 if (!rc) {
711 registered = 1;
712 } else {
713 registered = 0;
714 break;
715 }
716 }
717
718 return registered == 1 ? 0 : -ENODEV;
719 }
720
721 static void sn_pci_hotplug_exit(void)
722 {
723 struct hotplug_slot *bss_hotplug_slot;
724
725 while ((bss_hotplug_slot = sn_hp_destroy()))
726 pci_hp_deregister(bss_hotplug_slot);
727
728 if (!list_empty(&sn_hp_list))
729 printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
730 }
731
732 module_init(sn_pci_hotplug_init);
733 module_exit(sn_pci_hotplug_exit);
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