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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-stable.git] / drivers / pci / hotplug / ibmphp_core.c
blob197997e264a26be8f63ca7b6bf86e91bb865d751
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * IBM Hot Plug Controller Driver
4 *
5 * Written By: Chuck Cole, Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation
6 *
7 * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
8 * Copyright (C) 2001-2003 IBM Corp.
9 *
10 * All rights reserved.
11 *
12 * Send feedback to <gregkh@us.ibm.com>
13 *
14 */
15
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/pci.h>
20 #include <linux/interrupt.h>
21 #include <linux/delay.h>
22 #include <linux/wait.h>
23 #include "../pci.h"
24 #include <asm/pci_x86.h> /* for struct irq_routing_table */
25 #include <asm/io_apic.h>
26 #include "ibmphp.h"
27
28 #define attn_on(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNON)
29 #define attn_off(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNOFF)
30 #define attn_LED_blink(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_BLINKLED)
31 #define get_ctrl_revision(sl, rev) ibmphp_hpc_readslot(sl, READ_REVLEVEL, rev)
32 #define get_hpc_options(sl, opt) ibmphp_hpc_readslot(sl, READ_HPCOPTIONS, opt)
33
34 #define DRIVER_VERSION "0.6"
35 #define DRIVER_DESC "IBM Hot Plug PCI Controller Driver"
36
37 int ibmphp_debug;
38
39 static bool debug;
40 module_param(debug, bool, S_IRUGO | S_IWUSR);
41 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
42 MODULE_LICENSE("GPL");
43 MODULE_DESCRIPTION(DRIVER_DESC);
44
45 struct pci_bus *ibmphp_pci_bus;
46 static int max_slots;
47
48 static int irqs[16]; /* PIC mode IRQs we're using so far (in case MPS
49 * tables don't provide default info for empty slots */
50
51 static int init_flag;
52
53 static inline int get_cur_bus_info(struct slot **sl)
54 {
55 int rc = 1;
56 struct slot *slot_cur = *sl;
57
58 debug("options = %x\n", slot_cur->ctrl->options);
59 debug("revision = %x\n", slot_cur->ctrl->revision);
60
61 if (READ_BUS_STATUS(slot_cur->ctrl))
62 rc = ibmphp_hpc_readslot(slot_cur, READ_BUSSTATUS, NULL);
63
64 if (rc)
65 return rc;
66
67 slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED(slot_cur->busstatus);
68 if (READ_BUS_MODE(slot_cur->ctrl))
69 slot_cur->bus_on->current_bus_mode =
70 CURRENT_BUS_MODE(slot_cur->busstatus);
71 else
72 slot_cur->bus_on->current_bus_mode = 0xFF;
73
74 debug("busstatus = %x, bus_speed = %x, bus_mode = %x\n",
75 slot_cur->busstatus,
76 slot_cur->bus_on->current_speed,
77 slot_cur->bus_on->current_bus_mode);
78
79 *sl = slot_cur;
80 return 0;
81 }
82
83 static inline int slot_update(struct slot **sl)
84 {
85 int rc;
86 rc = ibmphp_hpc_readslot(*sl, READ_ALLSTAT, NULL);
87 if (rc)
88 return rc;
89 if (!init_flag)
90 rc = get_cur_bus_info(sl);
91 return rc;
92 }
93
94 static int __init get_max_slots(void)
95 {
96 struct slot *slot_cur;
97 u8 slot_count = 0;
98
99 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
100 /* sometimes the hot-pluggable slots start with 4 (not always from 1) */
101 slot_count = max(slot_count, slot_cur->number);
102 }
103 return slot_count;
104 }
105
106 /* This routine will put the correct slot->device information per slot. It's
107 * called from initialization of the slot structures. It will also assign
108 * interrupt numbers per each slot.
109 * Parameters: struct slot
110 * Returns 0 or errors
111 */
112 int ibmphp_init_devno(struct slot **cur_slot)
113 {
114 struct irq_routing_table *rtable;
115 int len;
116 int loop;
117 int i;
118
119 rtable = pcibios_get_irq_routing_table();
120 if (!rtable) {
121 err("no BIOS routing table...\n");
122 return -ENOMEM;
123 }
124
125 len = (rtable->size - sizeof(struct irq_routing_table)) /
126 sizeof(struct irq_info);
127
128 if (!len) {
129 kfree(rtable);
130 return -1;
131 }
132 for (loop = 0; loop < len; loop++) {
133 if ((*cur_slot)->number == rtable->slots[loop].slot &&
134 (*cur_slot)->bus == rtable->slots[loop].bus) {
135 (*cur_slot)->device = PCI_SLOT(rtable->slots[loop].devfn);
136 for (i = 0; i < 4; i++)
137 (*cur_slot)->irq[i] = IO_APIC_get_PCI_irq_vector((int) (*cur_slot)->bus,
138 (int) (*cur_slot)->device, i);
139
140 debug("(*cur_slot)->irq[0] = %x\n",
141 (*cur_slot)->irq[0]);
142 debug("(*cur_slot)->irq[1] = %x\n",
143 (*cur_slot)->irq[1]);
144 debug("(*cur_slot)->irq[2] = %x\n",
145 (*cur_slot)->irq[2]);
146 debug("(*cur_slot)->irq[3] = %x\n",
147 (*cur_slot)->irq[3]);
148
149 debug("rtable->exclusive_irqs = %x\n",
150 rtable->exclusive_irqs);
151 debug("rtable->slots[loop].irq[0].bitmap = %x\n",
152 rtable->slots[loop].irq[0].bitmap);
153 debug("rtable->slots[loop].irq[1].bitmap = %x\n",
154 rtable->slots[loop].irq[1].bitmap);
155 debug("rtable->slots[loop].irq[2].bitmap = %x\n",
156 rtable->slots[loop].irq[2].bitmap);
157 debug("rtable->slots[loop].irq[3].bitmap = %x\n",
158 rtable->slots[loop].irq[3].bitmap);
159
160 debug("rtable->slots[loop].irq[0].link = %x\n",
161 rtable->slots[loop].irq[0].link);
162 debug("rtable->slots[loop].irq[1].link = %x\n",
163 rtable->slots[loop].irq[1].link);
164 debug("rtable->slots[loop].irq[2].link = %x\n",
165 rtable->slots[loop].irq[2].link);
166 debug("rtable->slots[loop].irq[3].link = %x\n",
167 rtable->slots[loop].irq[3].link);
168 debug("end of init_devno\n");
169 kfree(rtable);
170 return 0;
171 }
172 }
173
174 kfree(rtable);
175 return -1;
176 }
177
178 static inline int power_on(struct slot *slot_cur)
179 {
180 u8 cmd = HPC_SLOT_ON;
181 int retval;
182
183 retval = ibmphp_hpc_writeslot(slot_cur, cmd);
184 if (retval) {
185 err("power on failed\n");
186 return retval;
187 }
188 if (CTLR_RESULT(slot_cur->ctrl->status)) {
189 err("command not completed successfully in power_on\n");
190 return -EIO;
191 }
192 msleep(3000); /* For ServeRAID cards, and some 66 PCI */
193 return 0;
194 }
195
196 static inline int power_off(struct slot *slot_cur)
197 {
198 u8 cmd = HPC_SLOT_OFF;
199 int retval;
200
201 retval = ibmphp_hpc_writeslot(slot_cur, cmd);
202 if (retval) {
203 err("power off failed\n");
204 return retval;
205 }
206 if (CTLR_RESULT(slot_cur->ctrl->status)) {
207 err("command not completed successfully in power_off\n");
208 retval = -EIO;
209 }
210 return retval;
211 }
212
213 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
214 {
215 int rc = 0;
216 struct slot *pslot;
217 u8 cmd = 0x00; /* avoid compiler warning */
218
219 debug("set_attention_status - Entry hotplug_slot[%lx] value[%x]\n",
220 (ulong) hotplug_slot, value);
221 ibmphp_lock_operations();
222
223
224 if (hotplug_slot) {
225 switch (value) {
226 case HPC_SLOT_ATTN_OFF:
227 cmd = HPC_SLOT_ATTNOFF;
228 break;
229 case HPC_SLOT_ATTN_ON:
230 cmd = HPC_SLOT_ATTNON;
231 break;
232 case HPC_SLOT_ATTN_BLINK:
233 cmd = HPC_SLOT_BLINKLED;
234 break;
235 default:
236 rc = -ENODEV;
237 err("set_attention_status - Error : invalid input [%x]\n",
238 value);
239 break;
240 }
241 if (rc == 0) {
242 pslot = to_slot(hotplug_slot);
243 rc = ibmphp_hpc_writeslot(pslot, cmd);
244 }
245 } else
246 rc = -ENODEV;
247
248 ibmphp_unlock_operations();
249
250 debug("set_attention_status - Exit rc[%d]\n", rc);
251 return rc;
252 }
253
254 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
255 {
256 int rc = -ENODEV;
257 struct slot *pslot;
258 struct slot myslot;
259
260 debug("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
261 (ulong) hotplug_slot, (ulong) value);
262
263 ibmphp_lock_operations();
264 if (hotplug_slot) {
265 pslot = to_slot(hotplug_slot);
266 memcpy(&myslot, pslot, sizeof(struct slot));
267 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
268 &myslot.status);
269 if (!rc)
270 rc = ibmphp_hpc_readslot(pslot, READ_EXTSLOTSTATUS,
271 &myslot.ext_status);
272 if (!rc)
273 *value = SLOT_ATTN(myslot.status, myslot.ext_status);
274 }
275
276 ibmphp_unlock_operations();
277 debug("get_attention_status - Exit rc[%d] value[%x]\n", rc, *value);
278 return rc;
279 }
280
281 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
282 {
283 int rc = -ENODEV;
284 struct slot *pslot;
285 struct slot myslot;
286
287 debug("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
288 (ulong) hotplug_slot, (ulong) value);
289 ibmphp_lock_operations();
290 if (hotplug_slot) {
291 pslot = to_slot(hotplug_slot);
292 memcpy(&myslot, pslot, sizeof(struct slot));
293 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
294 &myslot.status);
295 if (!rc)
296 *value = SLOT_LATCH(myslot.status);
297 }
298
299 ibmphp_unlock_operations();
300 debug("get_latch_status - Exit rc[%d] rc[%x] value[%x]\n",
301 rc, rc, *value);
302 return rc;
303 }
304
305
306 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
307 {
308 int rc = -ENODEV;
309 struct slot *pslot;
310 struct slot myslot;
311
312 debug("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
313 (ulong) hotplug_slot, (ulong) value);
314 ibmphp_lock_operations();
315 if (hotplug_slot) {
316 pslot = to_slot(hotplug_slot);
317 memcpy(&myslot, pslot, sizeof(struct slot));
318 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
319 &myslot.status);
320 if (!rc)
321 *value = SLOT_PWRGD(myslot.status);
322 }
323
324 ibmphp_unlock_operations();
325 debug("get_power_status - Exit rc[%d] rc[%x] value[%x]\n",
326 rc, rc, *value);
327 return rc;
328 }
329
330 static int get_adapter_present(struct hotplug_slot *hotplug_slot, u8 *value)
331 {
332 int rc = -ENODEV;
333 struct slot *pslot;
334 u8 present;
335 struct slot myslot;
336
337 debug("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
338 (ulong) hotplug_slot, (ulong) value);
339 ibmphp_lock_operations();
340 if (hotplug_slot) {
341 pslot = to_slot(hotplug_slot);
342 memcpy(&myslot, pslot, sizeof(struct slot));
343 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
344 &myslot.status);
345 if (!rc) {
346 present = SLOT_PRESENT(myslot.status);
347 if (present == HPC_SLOT_EMPTY)
348 *value = 0;
349 else
350 *value = 1;
351 }
352 }
353
354 ibmphp_unlock_operations();
355 debug("get_adapter_present - Exit rc[%d] value[%x]\n", rc, *value);
356 return rc;
357 }
358
359 static int get_max_bus_speed(struct slot *slot)
360 {
361 int rc = 0;
362 u8 mode = 0;
363 enum pci_bus_speed speed;
364 struct pci_bus *bus = slot->hotplug_slot.pci_slot->bus;
365
366 debug("%s - Entry slot[%p]\n", __func__, slot);
367
368 ibmphp_lock_operations();
369 mode = slot->supported_bus_mode;
370 speed = slot->supported_speed;
371 ibmphp_unlock_operations();
372
373 switch (speed) {
374 case BUS_SPEED_33:
375 break;
376 case BUS_SPEED_66:
377 if (mode == BUS_MODE_PCIX)
378 speed += 0x01;
379 break;
380 case BUS_SPEED_100:
381 case BUS_SPEED_133:
382 speed += 0x01;
383 break;
384 default:
385 /* Note (will need to change): there would be soon 256, 512 also */
386 rc = -ENODEV;
387 }
388
389 if (!rc)
390 bus->max_bus_speed = speed;
391
392 debug("%s - Exit rc[%d] speed[%x]\n", __func__, rc, speed);
393 return rc;
394 }
395
396 /****************************************************************************
397 * This routine will initialize the ops data structure used in the validate
398 * function. It will also power off empty slots that are powered on since BIOS
399 * leaves those on, albeit disconnected
400 ****************************************************************************/
401 static int __init init_ops(void)
402 {
403 struct slot *slot_cur;
404 int retval;
405 int rc;
406
407 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
408 debug("BEFORE GETTING SLOT STATUS, slot # %x\n",
409 slot_cur->number);
410 if (slot_cur->ctrl->revision == 0xFF)
411 if (get_ctrl_revision(slot_cur,
412 &slot_cur->ctrl->revision))
413 return -1;
414
415 if (slot_cur->bus_on->current_speed == 0xFF)
416 if (get_cur_bus_info(&slot_cur))
417 return -1;
418 get_max_bus_speed(slot_cur);
419
420 if (slot_cur->ctrl->options == 0xFF)
421 if (get_hpc_options(slot_cur, &slot_cur->ctrl->options))
422 return -1;
423
424 retval = slot_update(&slot_cur);
425 if (retval)
426 return retval;
427
428 debug("status = %x\n", slot_cur->status);
429 debug("ext_status = %x\n", slot_cur->ext_status);
430 debug("SLOT_POWER = %x\n", SLOT_POWER(slot_cur->status));
431 debug("SLOT_PRESENT = %x\n", SLOT_PRESENT(slot_cur->status));
432 debug("SLOT_LATCH = %x\n", SLOT_LATCH(slot_cur->status));
433
434 if ((SLOT_PWRGD(slot_cur->status)) &&
435 !(SLOT_PRESENT(slot_cur->status)) &&
436 !(SLOT_LATCH(slot_cur->status))) {
437 debug("BEFORE POWER OFF COMMAND\n");
438 rc = power_off(slot_cur);
439 if (rc)
440 return rc;
441
442 /* retval = slot_update(&slot_cur);
443 * if (retval)
444 * return retval;
445 * ibmphp_update_slot_info(slot_cur);
446 */
447 }
448 }
449 init_flag = 0;
450 return 0;
451 }
452
453 /* This operation will check whether the slot is within the bounds and
454 * the operation is valid to perform on that slot
455 * Parameters: slot, operation
456 * Returns: 0 or error codes
457 */
458 static int validate(struct slot *slot_cur, int opn)
459 {
460 int number;
461 int retval;
462
463 if (!slot_cur)
464 return -ENODEV;
465 number = slot_cur->number;
466 if ((number > max_slots) || (number < 0))
467 return -EBADSLT;
468 debug("slot_number in validate is %d\n", slot_cur->number);
469
470 retval = slot_update(&slot_cur);
471 if (retval)
472 return retval;
473
474 switch (opn) {
475 case ENABLE:
476 if (!(SLOT_PWRGD(slot_cur->status)) &&
477 (SLOT_PRESENT(slot_cur->status)) &&
478 !(SLOT_LATCH(slot_cur->status)))
479 return 0;
480 break;
481 case DISABLE:
482 if ((SLOT_PWRGD(slot_cur->status)) &&
483 (SLOT_PRESENT(slot_cur->status)) &&
484 !(SLOT_LATCH(slot_cur->status)))
485 return 0;
486 break;
487 default:
488 break;
489 }
490 err("validate failed....\n");
491 return -EINVAL;
492 }
493
494 /****************************************************************************
495 * This routine is for updating the data structures in the hotplug core
496 * Parameters: struct slot
497 * Returns: 0 or error
498 ****************************************************************************/
499 int ibmphp_update_slot_info(struct slot *slot_cur)
500 {
501 struct pci_bus *bus = slot_cur->hotplug_slot.pci_slot->bus;
502 u8 bus_speed;
503 u8 mode;
504
505 bus_speed = slot_cur->bus_on->current_speed;
506 mode = slot_cur->bus_on->current_bus_mode;
507
508 switch (bus_speed) {
509 case BUS_SPEED_33:
510 break;
511 case BUS_SPEED_66:
512 if (mode == BUS_MODE_PCIX)
513 bus_speed += 0x01;
514 else if (mode == BUS_MODE_PCI)
515 ;
516 else
517 bus_speed = PCI_SPEED_UNKNOWN;
518 break;
519 case BUS_SPEED_100:
520 case BUS_SPEED_133:
521 bus_speed += 0x01;
522 break;
523 default:
524 bus_speed = PCI_SPEED_UNKNOWN;
525 }
526
527 bus->cur_bus_speed = bus_speed;
528 // To do: bus_names
529
530 return 0;
531 }
532
533
534 /******************************************************************************
535 * This function will return the pci_func, given bus and devfunc, or NULL. It
536 * is called from visit routines
537 ******************************************************************************/
538
539 static struct pci_func *ibm_slot_find(u8 busno, u8 device, u8 function)
540 {
541 struct pci_func *func_cur;
542 struct slot *slot_cur;
543 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
544 if (slot_cur->func) {
545 func_cur = slot_cur->func;
546 while (func_cur) {
547 if ((func_cur->busno == busno) &&
548 (func_cur->device == device) &&
549 (func_cur->function == function))
550 return func_cur;
551 func_cur = func_cur->next;
552 }
553 }
554 }
555 return NULL;
556 }
557
558 /*************************************************************
559 * This routine frees up memory used by struct slot, including
560 * the pointers to pci_func, bus, hotplug_slot, controller,
561 * and deregistering from the hotplug core
562 *************************************************************/
563 static void free_slots(void)
564 {
565 struct slot *slot_cur, *next;
566
567 debug("%s -- enter\n", __func__);
568
569 list_for_each_entry_safe(slot_cur, next, &ibmphp_slot_head,
570 ibm_slot_list) {
571 pci_hp_del(&slot_cur->hotplug_slot);
572 slot_cur->ctrl = NULL;
573 slot_cur->bus_on = NULL;
574
575 /*
576 * We don't want to actually remove the resources,
577 * since ibmphp_free_resources() will do just that.
578 */
579 ibmphp_unconfigure_card(&slot_cur, -1);
580
581 pci_hp_destroy(&slot_cur->hotplug_slot);
582 kfree(slot_cur);
583 }
584 debug("%s -- exit\n", __func__);
585 }
586
587 static void ibm_unconfigure_device(struct pci_func *func)
588 {
589 struct pci_dev *temp;
590 u8 j;
591
592 debug("inside %s\n", __func__);
593 debug("func->device = %x, func->function = %x\n",
594 func->device, func->function);
595 debug("func->device << 3 | 0x0 = %x\n", func->device << 3 | 0x0);
596
597 pci_lock_rescan_remove();
598
599 for (j = 0; j < 0x08; j++) {
600 temp = pci_get_domain_bus_and_slot(0, func->busno,
601 (func->device << 3) | j);
602 if (temp) {
603 pci_stop_and_remove_bus_device(temp);
604 pci_dev_put(temp);
605 }
606 }
607
608 pci_dev_put(func->dev);
609
610 pci_unlock_rescan_remove();
611 }
612
613 /*
614 * The following function is to fix kernel bug regarding
615 * getting bus entries, here we manually add those primary
616 * bus entries to kernel bus structure whenever apply
617 */
618 static u8 bus_structure_fixup(u8 busno)
619 {
620 struct pci_bus *bus, *b;
621 struct pci_dev *dev;
622 u16 l;
623
624 if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno)))
625 return 1;
626
627 bus = kmalloc(sizeof(*bus), GFP_KERNEL);
628 if (!bus)
629 return 1;
630
631 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
632 if (!dev) {
633 kfree(bus);
634 return 1;
635 }
636
637 bus->number = busno;
638 bus->ops = ibmphp_pci_bus->ops;
639 dev->bus = bus;
640 for (dev->devfn = 0; dev->devfn < 256; dev->devfn += 8) {
641 if (!pci_read_config_word(dev, PCI_VENDOR_ID, &l) &&
642 (l != 0x0000) && (l != 0xffff)) {
643 debug("%s - Inside bus_structure_fixup()\n",
644 __func__);
645 b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
646 if (!b)
647 continue;
648
649 pci_bus_add_devices(b);
650 break;
651 }
652 }
653
654 kfree(dev);
655 kfree(bus);
656
657 return 0;
658 }
659
660 static int ibm_configure_device(struct pci_func *func)
661 {
662 struct pci_bus *child;
663 int num;
664 int flag = 0; /* this is to make sure we don't double scan the bus,
665 for bridged devices primarily */
666
667 pci_lock_rescan_remove();
668
669 if (!(bus_structure_fixup(func->busno)))
670 flag = 1;
671 if (func->dev == NULL)
672 func->dev = pci_get_domain_bus_and_slot(0, func->busno,
673 PCI_DEVFN(func->device, func->function));
674
675 if (func->dev == NULL) {
676 struct pci_bus *bus = pci_find_bus(0, func->busno);
677 if (!bus)
678 goto out;
679
680 num = pci_scan_slot(bus,
681 PCI_DEVFN(func->device, func->function));
682 if (num)
683 pci_bus_add_devices(bus);
684
685 func->dev = pci_get_domain_bus_and_slot(0, func->busno,
686 PCI_DEVFN(func->device, func->function));
687 if (func->dev == NULL) {
688 err("ERROR... : pci_dev still NULL\n");
689 goto out;
690 }
691 }
692 if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) {
693 pci_hp_add_bridge(func->dev);
694 child = func->dev->subordinate;
695 if (child)
696 pci_bus_add_devices(child);
697 }
698
699 out:
700 pci_unlock_rescan_remove();
701 return 0;
702 }
703
704 /*******************************************************
705 * Returns whether the bus is empty or not
706 *******************************************************/
707 static int is_bus_empty(struct slot *slot_cur)
708 {
709 int rc;
710 struct slot *tmp_slot;
711 u8 i = slot_cur->bus_on->slot_min;
712
713 while (i <= slot_cur->bus_on->slot_max) {
714 if (i == slot_cur->number) {
715 i++;
716 continue;
717 }
718 tmp_slot = ibmphp_get_slot_from_physical_num(i);
719 if (!tmp_slot)
720 return 0;
721 rc = slot_update(&tmp_slot);
722 if (rc)
723 return 0;
724 if (SLOT_PRESENT(tmp_slot->status) &&
725 SLOT_PWRGD(tmp_slot->status))
726 return 0;
727 i++;
728 }
729 return 1;
730 }
731
732 /***********************************************************
733 * If the HPC permits and the bus currently empty, tries to set the
734 * bus speed and mode at the maximum card and bus capability
735 * Parameters: slot
736 * Returns: bus is set (0) or error code
737 ***********************************************************/
738 static int set_bus(struct slot *slot_cur)
739 {
740 int rc;
741 u8 speed;
742 u8 cmd = 0x0;
743 int retval;
744 static const struct pci_device_id ciobx[] = {
745 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, 0x0101) },
746 { },
747 };
748
749 debug("%s - entry slot # %d\n", __func__, slot_cur->number);
750 if (SET_BUS_STATUS(slot_cur->ctrl) && is_bus_empty(slot_cur)) {
751 rc = slot_update(&slot_cur);
752 if (rc)
753 return rc;
754 speed = SLOT_SPEED(slot_cur->ext_status);
755 debug("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed);
756 switch (speed) {
757 case HPC_SLOT_SPEED_33:
758 cmd = HPC_BUS_33CONVMODE;
759 break;
760 case HPC_SLOT_SPEED_66:
761 if (SLOT_PCIX(slot_cur->ext_status)) {
762 if ((slot_cur->supported_speed >= BUS_SPEED_66) &&
763 (slot_cur->supported_bus_mode == BUS_MODE_PCIX))
764 cmd = HPC_BUS_66PCIXMODE;
765 else if (!SLOT_BUS_MODE(slot_cur->ext_status))
766 /* if max slot/bus capability is 66 pci
767 and there's no bus mode mismatch, then
768 the adapter supports 66 pci */
769 cmd = HPC_BUS_66CONVMODE;
770 else
771 cmd = HPC_BUS_33CONVMODE;
772 } else {
773 if (slot_cur->supported_speed >= BUS_SPEED_66)
774 cmd = HPC_BUS_66CONVMODE;
775 else
776 cmd = HPC_BUS_33CONVMODE;
777 }
778 break;
779 case HPC_SLOT_SPEED_133:
780 switch (slot_cur->supported_speed) {
781 case BUS_SPEED_33:
782 cmd = HPC_BUS_33CONVMODE;
783 break;
784 case BUS_SPEED_66:
785 if (slot_cur->supported_bus_mode == BUS_MODE_PCIX)
786 cmd = HPC_BUS_66PCIXMODE;
787 else
788 cmd = HPC_BUS_66CONVMODE;
789 break;
790 case BUS_SPEED_100:
791 cmd = HPC_BUS_100PCIXMODE;
792 break;
793 case BUS_SPEED_133:
794 /* This is to take care of the bug in CIOBX chip */
795 if (pci_dev_present(ciobx))
796 ibmphp_hpc_writeslot(slot_cur,
797 HPC_BUS_100PCIXMODE);
798 cmd = HPC_BUS_133PCIXMODE;
799 break;
800 default:
801 err("Wrong bus speed\n");
802 return -ENODEV;
803 }
804 break;
805 default:
806 err("wrong slot speed\n");
807 return -ENODEV;
808 }
809 debug("setting bus speed for slot %d, cmd %x\n",
810 slot_cur->number, cmd);
811 retval = ibmphp_hpc_writeslot(slot_cur, cmd);
812 if (retval) {
813 err("setting bus speed failed\n");
814 return retval;
815 }
816 if (CTLR_RESULT(slot_cur->ctrl->status)) {
817 err("command not completed successfully in set_bus\n");
818 return -EIO;
819 }
820 }
821 /* This is for x440, once Brandon fixes the firmware,
822 will not need this delay */
823 msleep(1000);
824 debug("%s -Exit\n", __func__);
825 return 0;
826 }
827
828 /* This routine checks the bus limitations that the slot is on from the BIOS.
829 * This is used in deciding whether or not to power up the slot.
830 * (electrical/spec limitations. For example, >1 133 MHz or >2 66 PCI cards on
831 * same bus)
832 * Parameters: slot
833 * Returns: 0 = no limitations, -EINVAL = exceeded limitations on the bus
834 */
835 static int check_limitations(struct slot *slot_cur)
836 {
837 u8 i;
838 struct slot *tmp_slot;
839 u8 count = 0;
840 u8 limitation = 0;
841
842 for (i = slot_cur->bus_on->slot_min; i <= slot_cur->bus_on->slot_max; i++) {
843 tmp_slot = ibmphp_get_slot_from_physical_num(i);
844 if (!tmp_slot)
845 return -ENODEV;
846 if ((SLOT_PWRGD(tmp_slot->status)) &&
847 !(SLOT_CONNECT(tmp_slot->status)))
848 count++;
849 }
850 get_cur_bus_info(&slot_cur);
851 switch (slot_cur->bus_on->current_speed) {
852 case BUS_SPEED_33:
853 limitation = slot_cur->bus_on->slots_at_33_conv;
854 break;
855 case BUS_SPEED_66:
856 if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX)
857 limitation = slot_cur->bus_on->slots_at_66_pcix;
858 else
859 limitation = slot_cur->bus_on->slots_at_66_conv;
860 break;
861 case BUS_SPEED_100:
862 limitation = slot_cur->bus_on->slots_at_100_pcix;
863 break;
864 case BUS_SPEED_133:
865 limitation = slot_cur->bus_on->slots_at_133_pcix;
866 break;
867 }
868
869 if ((count + 1) > limitation)
870 return -EINVAL;
871 return 0;
872 }
873
874 static inline void print_card_capability(struct slot *slot_cur)
875 {
876 info("capability of the card is ");
877 if ((slot_cur->ext_status & CARD_INFO) == PCIX133)
878 info(" 133 MHz PCI-X\n");
879 else if ((slot_cur->ext_status & CARD_INFO) == PCIX66)
880 info(" 66 MHz PCI-X\n");
881 else if ((slot_cur->ext_status & CARD_INFO) == PCI66)
882 info(" 66 MHz PCI\n");
883 else
884 info(" 33 MHz PCI\n");
885
886 }
887
888 /* This routine will power on the slot, configure the device(s) and find the
889 * drivers for them.
890 * Parameters: hotplug_slot
891 * Returns: 0 or failure codes
892 */
893 static int enable_slot(struct hotplug_slot *hs)
894 {
895 int rc, i, rcpr;
896 struct slot *slot_cur;
897 u8 function;
898 struct pci_func *tmp_func;
899
900 ibmphp_lock_operations();
901
902 debug("ENABLING SLOT........\n");
903 slot_cur = to_slot(hs);
904
905 rc = validate(slot_cur, ENABLE);
906 if (rc) {
907 err("validate function failed\n");
908 goto error_nopower;
909 }
910
911 attn_LED_blink(slot_cur);
912
913 rc = set_bus(slot_cur);
914 if (rc) {
915 err("was not able to set the bus\n");
916 goto error_nopower;
917 }
918
919 /*-----------------debugging------------------------------*/
920 get_cur_bus_info(&slot_cur);
921 debug("the current bus speed right after set_bus = %x\n",
922 slot_cur->bus_on->current_speed);
923 /*----------------------------------------------------------*/
924
925 rc = check_limitations(slot_cur);
926 if (rc) {
927 err("Adding this card exceeds the limitations of this bus.\n");
928 err("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus.\n");
929 err("Try hot-adding into another bus\n");
930 rc = -EINVAL;
931 goto error_nopower;
932 }
933
934 rc = power_on(slot_cur);
935
936 if (rc) {
937 err("something wrong when powering up... please see below for details\n");
938 /* need to turn off before on, otherwise, blinking overwrites */
939 attn_off(slot_cur);
940 attn_on(slot_cur);
941 if (slot_update(&slot_cur)) {
942 attn_off(slot_cur);
943 attn_on(slot_cur);
944 rc = -ENODEV;
945 goto exit;
946 }
947 /* Check to see the error of why it failed */
948 if ((SLOT_POWER(slot_cur->status)) &&
949 !(SLOT_PWRGD(slot_cur->status)))
950 err("power fault occurred trying to power up\n");
951 else if (SLOT_BUS_SPEED(slot_cur->status)) {
952 err("bus speed mismatch occurred. please check current bus speed and card capability\n");
953 print_card_capability(slot_cur);
954 } else if (SLOT_BUS_MODE(slot_cur->ext_status)) {
955 err("bus mode mismatch occurred. please check current bus mode and card capability\n");
956 print_card_capability(slot_cur);
957 }
958 ibmphp_update_slot_info(slot_cur);
959 goto exit;
960 }
961 debug("after power_on\n");
962 /*-----------------------debugging---------------------------*/
963 get_cur_bus_info(&slot_cur);
964 debug("the current bus speed right after power_on = %x\n",
965 slot_cur->bus_on->current_speed);
966 /*----------------------------------------------------------*/
967
968 rc = slot_update(&slot_cur);
969 if (rc)
970 goto error_power;
971
972 rc = -EINVAL;
973 if (SLOT_POWER(slot_cur->status) && !(SLOT_PWRGD(slot_cur->status))) {
974 err("power fault occurred trying to power up...\n");
975 goto error_power;
976 }
977 if (SLOT_POWER(slot_cur->status) && (SLOT_BUS_SPEED(slot_cur->status))) {
978 err("bus speed mismatch occurred. please check current bus speed and card capability\n");
979 print_card_capability(slot_cur);
980 goto error_power;
981 }
982 /* Don't think this case will happen after above checks...
983 * but just in case, for paranoia sake */
984 if (!(SLOT_POWER(slot_cur->status))) {
985 err("power on failed...\n");
986 goto error_power;
987 }
988
989 slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
990 if (!slot_cur->func) {
991 /* do update_slot_info here? */
992 rc = -ENOMEM;
993 goto error_power;
994 }
995 slot_cur->func->busno = slot_cur->bus;
996 slot_cur->func->device = slot_cur->device;
997 for (i = 0; i < 4; i++)
998 slot_cur->func->irq[i] = slot_cur->irq[i];
999
1000 debug("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n",
1001 slot_cur->bus, slot_cur->device);
1002
1003 if (ibmphp_configure_card(slot_cur->func, slot_cur->number)) {
1004 err("configure_card was unsuccessful...\n");
1005 /* true because don't need to actually deallocate resources,
1006 * just remove references */
1007 ibmphp_unconfigure_card(&slot_cur, 1);
1008 debug("after unconfigure_card\n");
1009 slot_cur->func = NULL;
1010 rc = -ENOMEM;
1011 goto error_power;
1012 }
1013
1014 function = 0x00;
1015 do {
1016 tmp_func = ibm_slot_find(slot_cur->bus, slot_cur->func->device,
1017 function++);
1018 if (tmp_func && !(tmp_func->dev))
1019 ibm_configure_device(tmp_func);
1020 } while (tmp_func);
1021
1022 attn_off(slot_cur);
1023 if (slot_update(&slot_cur)) {
1024 rc = -EFAULT;
1025 goto exit;
1026 }
1027 ibmphp_print_test();
1028 rc = ibmphp_update_slot_info(slot_cur);
1029 exit:
1030 ibmphp_unlock_operations();
1031 return rc;
1032
1033 error_nopower:
1034 attn_off(slot_cur); /* need to turn off if was blinking b4 */
1035 attn_on(slot_cur);
1036 error_cont:
1037 rcpr = slot_update(&slot_cur);
1038 if (rcpr) {
1039 rc = rcpr;
1040 goto exit;
1041 }
1042 ibmphp_update_slot_info(slot_cur);
1043 goto exit;
1044
1045 error_power:
1046 attn_off(slot_cur); /* need to turn off if was blinking b4 */
1047 attn_on(slot_cur);
1048 rcpr = power_off(slot_cur);
1049 if (rcpr) {
1050 rc = rcpr;
1051 goto exit;
1052 }
1053 goto error_cont;
1054 }
1055
1056 /**************************************************************
1057 * HOT REMOVING ADAPTER CARD *
1058 * INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE *
1059 * OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE *
1060 * DISABLE POWER , *
1061 **************************************************************/
1062 static int ibmphp_disable_slot(struct hotplug_slot *hotplug_slot)
1063 {
1064 struct slot *slot = to_slot(hotplug_slot);
1065 int rc;
1066
1067 ibmphp_lock_operations();
1068 rc = ibmphp_do_disable_slot(slot);
1069 ibmphp_unlock_operations();
1070 return rc;
1071 }
1072
1073 int ibmphp_do_disable_slot(struct slot *slot_cur)
1074 {
1075 int rc;
1076 u8 flag;
1077
1078 debug("DISABLING SLOT...\n");
1079
1080 if ((slot_cur == NULL) || (slot_cur->ctrl == NULL))
1081 return -ENODEV;
1082
1083 flag = slot_cur->flag;
1084 slot_cur->flag = 1;
1085
1086 if (flag == 1) {
1087 rc = validate(slot_cur, DISABLE);
1088 /* checking if powered off already & valid slot # */
1089 if (rc)
1090 goto error;
1091 }
1092 attn_LED_blink(slot_cur);
1093
1094 if (slot_cur->func == NULL) {
1095 /* We need this for functions that were there on bootup */
1096 slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
1097 if (!slot_cur->func) {
1098 rc = -ENOMEM;
1099 goto error;
1100 }
1101 slot_cur->func->busno = slot_cur->bus;
1102 slot_cur->func->device = slot_cur->device;
1103 }
1104
1105 ibm_unconfigure_device(slot_cur->func);
1106
1107 /*
1108 * If we got here from latch suddenly opening on operating card or
1109 * a power fault, there's no power to the card, so cannot
1110 * read from it to determine what resources it occupied. This operation
1111 * is forbidden anyhow. The best we can do is remove it from kernel
1112 * lists at least */
1113
1114 if (!flag) {
1115 attn_off(slot_cur);
1116 return 0;
1117 }
1118
1119 rc = ibmphp_unconfigure_card(&slot_cur, 0);
1120 slot_cur->func = NULL;
1121 debug("in disable_slot. after unconfigure_card\n");
1122 if (rc) {
1123 err("could not unconfigure card.\n");
1124 goto error;
1125 }
1126
1127 rc = ibmphp_hpc_writeslot(slot_cur, HPC_SLOT_OFF);
1128 if (rc)
1129 goto error;
1130
1131 attn_off(slot_cur);
1132 rc = slot_update(&slot_cur);
1133 if (rc)
1134 goto exit;
1135
1136 rc = ibmphp_update_slot_info(slot_cur);
1137 ibmphp_print_test();
1138 exit:
1139 return rc;
1140
1141 error:
1142 /* Need to turn off if was blinking b4 */
1143 attn_off(slot_cur);
1144 attn_on(slot_cur);
1145 if (slot_update(&slot_cur)) {
1146 rc = -EFAULT;
1147 goto exit;
1148 }
1149 if (flag)
1150 ibmphp_update_slot_info(slot_cur);
1151 goto exit;
1152 }
1153
1154 const struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
1155 .set_attention_status = set_attention_status,
1156 .enable_slot = enable_slot,
1157 .disable_slot = ibmphp_disable_slot,
1158 .hardware_test = NULL,
1159 .get_power_status = get_power_status,
1160 .get_attention_status = get_attention_status,
1161 .get_latch_status = get_latch_status,
1162 .get_adapter_status = get_adapter_present,
1163 };
1164
1165 static void ibmphp_unload(void)
1166 {
1167 free_slots();
1168 debug("after slots\n");
1169 ibmphp_free_resources();
1170 debug("after resources\n");
1171 ibmphp_free_bus_info_queue();
1172 debug("after bus info\n");
1173 ibmphp_free_ebda_hpc_queue();
1174 debug("after ebda hpc\n");
1175 ibmphp_free_ebda_pci_rsrc_queue();
1176 debug("after ebda pci rsrc\n");
1177 kfree(ibmphp_pci_bus);
1178 }
1179
1180 static int __init ibmphp_init(void)
1181 {
1182 struct pci_bus *bus;
1183 int i = 0;
1184 int rc = 0;
1185
1186 init_flag = 1;
1187
1188 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
1189
1190 ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL);
1191 if (!ibmphp_pci_bus) {
1192 rc = -ENOMEM;
1193 goto exit;
1194 }
1195
1196 bus = pci_find_bus(0, 0);
1197 if (!bus) {
1198 err("Can't find the root pci bus, can not continue\n");
1199 rc = -ENODEV;
1200 goto error;
1201 }
1202 memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus));
1203
1204 ibmphp_debug = debug;
1205
1206 for (i = 0; i < 16; i++)
1207 irqs[i] = 0;
1208
1209 rc = ibmphp_access_ebda();
1210 if (rc)
1211 goto error;
1212 debug("after ibmphp_access_ebda()\n");
1213
1214 rc = ibmphp_rsrc_init();
1215 if (rc)
1216 goto error;
1217 debug("AFTER Resource & EBDA INITIALIZATIONS\n");
1218
1219 max_slots = get_max_slots();
1220
1221 rc = ibmphp_register_pci();
1222 if (rc)
1223 goto error;
1224
1225 if (init_ops()) {
1226 rc = -ENODEV;
1227 goto error;
1228 }
1229
1230 ibmphp_print_test();
1231 rc = ibmphp_hpc_start_poll_thread();
1232 if (rc)
1233 goto error;
1234
1235 exit:
1236 return rc;
1237
1238 error:
1239 ibmphp_unload();
1240 goto exit;
1241 }
1242
1243 static void __exit ibmphp_exit(void)
1244 {
1245 ibmphp_hpc_stop_poll_thread();
1246 debug("after polling\n");
1247 ibmphp_unload();
1248 debug("done\n");
1249 }
1250
1251 module_init(ibmphp_init);
1252 module_exit(ibmphp_exit);
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