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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / pci / hotplug / ibmphp_core.c
blob17124254d897848d0150fa347d983806c7e6cf9a
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 /*
54 static int get_max_adapter_speed_1 (struct hotplug_slot *, u8 *, u8);
55
56 static inline int get_max_adapter_speed (struct hotplug_slot *hs, u8 *value)
57 {
58 return get_max_adapter_speed_1 (hs, value, 1);
59 }
60 */
61 static inline int get_cur_bus_info(struct slot **sl)
62 {
63 int rc = 1;
64 struct slot *slot_cur = *sl;
65
66 debug("options = %x\n", slot_cur->ctrl->options);
67 debug("revision = %x\n", slot_cur->ctrl->revision);
68
69 if (READ_BUS_STATUS(slot_cur->ctrl))
70 rc = ibmphp_hpc_readslot(slot_cur, READ_BUSSTATUS, NULL);
71
72 if (rc)
73 return rc;
74
75 slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED(slot_cur->busstatus);
76 if (READ_BUS_MODE(slot_cur->ctrl))
77 slot_cur->bus_on->current_bus_mode =
78 CURRENT_BUS_MODE(slot_cur->busstatus);
79 else
80 slot_cur->bus_on->current_bus_mode = 0xFF;
81
82 debug("busstatus = %x, bus_speed = %x, bus_mode = %x\n",
83 slot_cur->busstatus,
84 slot_cur->bus_on->current_speed,
85 slot_cur->bus_on->current_bus_mode);
86
87 *sl = slot_cur;
88 return 0;
89 }
90
91 static inline int slot_update(struct slot **sl)
92 {
93 int rc;
94 rc = ibmphp_hpc_readslot(*sl, READ_ALLSTAT, NULL);
95 if (rc)
96 return rc;
97 if (!init_flag)
98 rc = get_cur_bus_info(sl);
99 return rc;
100 }
101
102 static int __init get_max_slots(void)
103 {
104 struct slot *slot_cur;
105 u8 slot_count = 0;
106
107 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
108 /* sometimes the hot-pluggable slots start with 4 (not always from 1) */
109 slot_count = max(slot_count, slot_cur->number);
110 }
111 return slot_count;
112 }
113
114 /* This routine will put the correct slot->device information per slot. It's
115 * called from initialization of the slot structures. It will also assign
116 * interrupt numbers per each slot.
117 * Parameters: struct slot
118 * Returns 0 or errors
119 */
120 int ibmphp_init_devno(struct slot **cur_slot)
121 {
122 struct irq_routing_table *rtable;
123 int len;
124 int loop;
125 int i;
126
127 rtable = pcibios_get_irq_routing_table();
128 if (!rtable) {
129 err("no BIOS routing table...\n");
130 return -ENOMEM;
131 }
132
133 len = (rtable->size - sizeof(struct irq_routing_table)) /
134 sizeof(struct irq_info);
135
136 if (!len) {
137 kfree(rtable);
138 return -1;
139 }
140 for (loop = 0; loop < len; loop++) {
141 if ((*cur_slot)->number == rtable->slots[loop].slot &&
142 (*cur_slot)->bus == rtable->slots[loop].bus) {
143 (*cur_slot)->device = PCI_SLOT(rtable->slots[loop].devfn);
144 for (i = 0; i < 4; i++)
145 (*cur_slot)->irq[i] = IO_APIC_get_PCI_irq_vector((int) (*cur_slot)->bus,
146 (int) (*cur_slot)->device, i);
147
148 debug("(*cur_slot)->irq[0] = %x\n",
149 (*cur_slot)->irq[0]);
150 debug("(*cur_slot)->irq[1] = %x\n",
151 (*cur_slot)->irq[1]);
152 debug("(*cur_slot)->irq[2] = %x\n",
153 (*cur_slot)->irq[2]);
154 debug("(*cur_slot)->irq[3] = %x\n",
155 (*cur_slot)->irq[3]);
156
157 debug("rtable->exclusive_irqs = %x\n",
158 rtable->exclusive_irqs);
159 debug("rtable->slots[loop].irq[0].bitmap = %x\n",
160 rtable->slots[loop].irq[0].bitmap);
161 debug("rtable->slots[loop].irq[1].bitmap = %x\n",
162 rtable->slots[loop].irq[1].bitmap);
163 debug("rtable->slots[loop].irq[2].bitmap = %x\n",
164 rtable->slots[loop].irq[2].bitmap);
165 debug("rtable->slots[loop].irq[3].bitmap = %x\n",
166 rtable->slots[loop].irq[3].bitmap);
167
168 debug("rtable->slots[loop].irq[0].link = %x\n",
169 rtable->slots[loop].irq[0].link);
170 debug("rtable->slots[loop].irq[1].link = %x\n",
171 rtable->slots[loop].irq[1].link);
172 debug("rtable->slots[loop].irq[2].link = %x\n",
173 rtable->slots[loop].irq[2].link);
174 debug("rtable->slots[loop].irq[3].link = %x\n",
175 rtable->slots[loop].irq[3].link);
176 debug("end of init_devno\n");
177 kfree(rtable);
178 return 0;
179 }
180 }
181
182 kfree(rtable);
183 return -1;
184 }
185
186 static inline int power_on(struct slot *slot_cur)
187 {
188 u8 cmd = HPC_SLOT_ON;
189 int retval;
190
191 retval = ibmphp_hpc_writeslot(slot_cur, cmd);
192 if (retval) {
193 err("power on failed\n");
194 return retval;
195 }
196 if (CTLR_RESULT(slot_cur->ctrl->status)) {
197 err("command not completed successfully in power_on\n");
198 return -EIO;
199 }
200 msleep(3000); /* For ServeRAID cards, and some 66 PCI */
201 return 0;
202 }
203
204 static inline int power_off(struct slot *slot_cur)
205 {
206 u8 cmd = HPC_SLOT_OFF;
207 int retval;
208
209 retval = ibmphp_hpc_writeslot(slot_cur, cmd);
210 if (retval) {
211 err("power off failed\n");
212 return retval;
213 }
214 if (CTLR_RESULT(slot_cur->ctrl->status)) {
215 err("command not completed successfully in power_off\n");
216 retval = -EIO;
217 }
218 return retval;
219 }
220
221 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
222 {
223 int rc = 0;
224 struct slot *pslot;
225 u8 cmd = 0x00; /* avoid compiler warning */
226
227 debug("set_attention_status - Entry hotplug_slot[%lx] value[%x]\n",
228 (ulong) hotplug_slot, value);
229 ibmphp_lock_operations();
230
231
232 if (hotplug_slot) {
233 switch (value) {
234 case HPC_SLOT_ATTN_OFF:
235 cmd = HPC_SLOT_ATTNOFF;
236 break;
237 case HPC_SLOT_ATTN_ON:
238 cmd = HPC_SLOT_ATTNON;
239 break;
240 case HPC_SLOT_ATTN_BLINK:
241 cmd = HPC_SLOT_BLINKLED;
242 break;
243 default:
244 rc = -ENODEV;
245 err("set_attention_status - Error : invalid input [%x]\n",
246 value);
247 break;
248 }
249 if (rc == 0) {
250 pslot = to_slot(hotplug_slot);
251 rc = ibmphp_hpc_writeslot(pslot, cmd);
252 }
253 } else
254 rc = -ENODEV;
255
256 ibmphp_unlock_operations();
257
258 debug("set_attention_status - Exit rc[%d]\n", rc);
259 return rc;
260 }
261
262 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
263 {
264 int rc = -ENODEV;
265 struct slot *pslot;
266 struct slot myslot;
267
268 debug("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
269 (ulong) hotplug_slot, (ulong) value);
270
271 ibmphp_lock_operations();
272 if (hotplug_slot) {
273 pslot = to_slot(hotplug_slot);
274 memcpy(&myslot, pslot, sizeof(struct slot));
275 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
276 &myslot.status);
277 if (!rc)
278 rc = ibmphp_hpc_readslot(pslot, READ_EXTSLOTSTATUS,
279 &myslot.ext_status);
280 if (!rc)
281 *value = SLOT_ATTN(myslot.status, myslot.ext_status);
282 }
283
284 ibmphp_unlock_operations();
285 debug("get_attention_status - Exit rc[%d] value[%x]\n", rc, *value);
286 return rc;
287 }
288
289 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
290 {
291 int rc = -ENODEV;
292 struct slot *pslot;
293 struct slot myslot;
294
295 debug("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
296 (ulong) hotplug_slot, (ulong) value);
297 ibmphp_lock_operations();
298 if (hotplug_slot) {
299 pslot = to_slot(hotplug_slot);
300 memcpy(&myslot, pslot, sizeof(struct slot));
301 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
302 &myslot.status);
303 if (!rc)
304 *value = SLOT_LATCH(myslot.status);
305 }
306
307 ibmphp_unlock_operations();
308 debug("get_latch_status - Exit rc[%d] rc[%x] value[%x]\n",
309 rc, rc, *value);
310 return rc;
311 }
312
313
314 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
315 {
316 int rc = -ENODEV;
317 struct slot *pslot;
318 struct slot myslot;
319
320 debug("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
321 (ulong) hotplug_slot, (ulong) value);
322 ibmphp_lock_operations();
323 if (hotplug_slot) {
324 pslot = to_slot(hotplug_slot);
325 memcpy(&myslot, pslot, sizeof(struct slot));
326 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
327 &myslot.status);
328 if (!rc)
329 *value = SLOT_PWRGD(myslot.status);
330 }
331
332 ibmphp_unlock_operations();
333 debug("get_power_status - Exit rc[%d] rc[%x] value[%x]\n",
334 rc, rc, *value);
335 return rc;
336 }
337
338 static int get_adapter_present(struct hotplug_slot *hotplug_slot, u8 *value)
339 {
340 int rc = -ENODEV;
341 struct slot *pslot;
342 u8 present;
343 struct slot myslot;
344
345 debug("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
346 (ulong) hotplug_slot, (ulong) value);
347 ibmphp_lock_operations();
348 if (hotplug_slot) {
349 pslot = to_slot(hotplug_slot);
350 memcpy(&myslot, pslot, sizeof(struct slot));
351 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
352 &myslot.status);
353 if (!rc) {
354 present = SLOT_PRESENT(myslot.status);
355 if (present == HPC_SLOT_EMPTY)
356 *value = 0;
357 else
358 *value = 1;
359 }
360 }
361
362 ibmphp_unlock_operations();
363 debug("get_adapter_present - Exit rc[%d] value[%x]\n", rc, *value);
364 return rc;
365 }
366
367 static int get_max_bus_speed(struct slot *slot)
368 {
369 int rc = 0;
370 u8 mode = 0;
371 enum pci_bus_speed speed;
372 struct pci_bus *bus = slot->hotplug_slot.pci_slot->bus;
373
374 debug("%s - Entry slot[%p]\n", __func__, slot);
375
376 ibmphp_lock_operations();
377 mode = slot->supported_bus_mode;
378 speed = slot->supported_speed;
379 ibmphp_unlock_operations();
380
381 switch (speed) {
382 case BUS_SPEED_33:
383 break;
384 case BUS_SPEED_66:
385 if (mode == BUS_MODE_PCIX)
386 speed += 0x01;
387 break;
388 case BUS_SPEED_100:
389 case BUS_SPEED_133:
390 speed += 0x01;
391 break;
392 default:
393 /* Note (will need to change): there would be soon 256, 512 also */
394 rc = -ENODEV;
395 }
396
397 if (!rc)
398 bus->max_bus_speed = speed;
399
400 debug("%s - Exit rc[%d] speed[%x]\n", __func__, rc, speed);
401 return rc;
402 }
403
404 /*
405 static int get_max_adapter_speed_1(struct hotplug_slot *hotplug_slot, u8 *value, u8 flag)
406 {
407 int rc = -ENODEV;
408 struct slot *pslot;
409 struct slot myslot;
410
411 debug("get_max_adapter_speed_1 - Entry hotplug_slot[%lx] pvalue[%lx]\n",
412 (ulong)hotplug_slot, (ulong) value);
413
414 if (flag)
415 ibmphp_lock_operations();
416
417 if (hotplug_slot && value) {
418 pslot = hotplug_slot->private;
419 if (pslot) {
420 memcpy(&myslot, pslot, sizeof(struct slot));
421 rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
422 &(myslot.status));
423
424 if (!(SLOT_LATCH (myslot.status)) &&
425 (SLOT_PRESENT (myslot.status))) {
426 rc = ibmphp_hpc_readslot(pslot,
427 READ_EXTSLOTSTATUS,
428 &(myslot.ext_status));
429 if (!rc)
430 *value = SLOT_SPEED(myslot.ext_status);
431 } else
432 *value = MAX_ADAPTER_NONE;
433 }
434 }
435
436 if (flag)
437 ibmphp_unlock_operations();
438
439 debug("get_max_adapter_speed_1 - Exit rc[%d] value[%x]\n", rc, *value);
440 return rc;
441 }
442
443 static int get_bus_name(struct hotplug_slot *hotplug_slot, char *value)
444 {
445 int rc = -ENODEV;
446 struct slot *pslot = NULL;
447
448 debug("get_bus_name - Entry hotplug_slot[%lx]\n", (ulong)hotplug_slot);
449
450 ibmphp_lock_operations();
451
452 if (hotplug_slot) {
453 pslot = hotplug_slot->private;
454 if (pslot) {
455 rc = 0;
456 snprintf(value, 100, "Bus %x", pslot->bus);
457 }
458 } else
459 rc = -ENODEV;
460
461 ibmphp_unlock_operations();
462 debug("get_bus_name - Exit rc[%d] value[%x]\n", rc, *value);
463 return rc;
464 }
465 */
466
467 /****************************************************************************
468 * This routine will initialize the ops data structure used in the validate
469 * function. It will also power off empty slots that are powered on since BIOS
470 * leaves those on, albeit disconnected
471 ****************************************************************************/
472 static int __init init_ops(void)
473 {
474 struct slot *slot_cur;
475 int retval;
476 int rc;
477
478 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
479 debug("BEFORE GETTING SLOT STATUS, slot # %x\n",
480 slot_cur->number);
481 if (slot_cur->ctrl->revision == 0xFF)
482 if (get_ctrl_revision(slot_cur,
483 &slot_cur->ctrl->revision))
484 return -1;
485
486 if (slot_cur->bus_on->current_speed == 0xFF)
487 if (get_cur_bus_info(&slot_cur))
488 return -1;
489 get_max_bus_speed(slot_cur);
490
491 if (slot_cur->ctrl->options == 0xFF)
492 if (get_hpc_options(slot_cur, &slot_cur->ctrl->options))
493 return -1;
494
495 retval = slot_update(&slot_cur);
496 if (retval)
497 return retval;
498
499 debug("status = %x\n", slot_cur->status);
500 debug("ext_status = %x\n", slot_cur->ext_status);
501 debug("SLOT_POWER = %x\n", SLOT_POWER(slot_cur->status));
502 debug("SLOT_PRESENT = %x\n", SLOT_PRESENT(slot_cur->status));
503 debug("SLOT_LATCH = %x\n", SLOT_LATCH(slot_cur->status));
504
505 if ((SLOT_PWRGD(slot_cur->status)) &&
506 !(SLOT_PRESENT(slot_cur->status)) &&
507 !(SLOT_LATCH(slot_cur->status))) {
508 debug("BEFORE POWER OFF COMMAND\n");
509 rc = power_off(slot_cur);
510 if (rc)
511 return rc;
512
513 /* retval = slot_update(&slot_cur);
514 * if (retval)
515 * return retval;
516 * ibmphp_update_slot_info(slot_cur);
517 */
518 }
519 }
520 init_flag = 0;
521 return 0;
522 }
523
524 /* This operation will check whether the slot is within the bounds and
525 * the operation is valid to perform on that slot
526 * Parameters: slot, operation
527 * Returns: 0 or error codes
528 */
529 static int validate(struct slot *slot_cur, int opn)
530 {
531 int number;
532 int retval;
533
534 if (!slot_cur)
535 return -ENODEV;
536 number = slot_cur->number;
537 if ((number > max_slots) || (number < 0))
538 return -EBADSLT;
539 debug("slot_number in validate is %d\n", slot_cur->number);
540
541 retval = slot_update(&slot_cur);
542 if (retval)
543 return retval;
544
545 switch (opn) {
546 case ENABLE:
547 if (!(SLOT_PWRGD(slot_cur->status)) &&
548 (SLOT_PRESENT(slot_cur->status)) &&
549 !(SLOT_LATCH(slot_cur->status)))
550 return 0;
551 break;
552 case DISABLE:
553 if ((SLOT_PWRGD(slot_cur->status)) &&
554 (SLOT_PRESENT(slot_cur->status)) &&
555 !(SLOT_LATCH(slot_cur->status)))
556 return 0;
557 break;
558 default:
559 break;
560 }
561 err("validate failed....\n");
562 return -EINVAL;
563 }
564
565 /****************************************************************************
566 * This routine is for updating the data structures in the hotplug core
567 * Parameters: struct slot
568 * Returns: 0 or error
569 ****************************************************************************/
570 int ibmphp_update_slot_info(struct slot *slot_cur)
571 {
572 struct pci_bus *bus = slot_cur->hotplug_slot.pci_slot->bus;
573 u8 bus_speed;
574 u8 mode;
575
576 bus_speed = slot_cur->bus_on->current_speed;
577 mode = slot_cur->bus_on->current_bus_mode;
578
579 switch (bus_speed) {
580 case BUS_SPEED_33:
581 break;
582 case BUS_SPEED_66:
583 if (mode == BUS_MODE_PCIX)
584 bus_speed += 0x01;
585 else if (mode == BUS_MODE_PCI)
586 ;
587 else
588 bus_speed = PCI_SPEED_UNKNOWN;
589 break;
590 case BUS_SPEED_100:
591 case BUS_SPEED_133:
592 bus_speed += 0x01;
593 break;
594 default:
595 bus_speed = PCI_SPEED_UNKNOWN;
596 }
597
598 bus->cur_bus_speed = bus_speed;
599 // To do: bus_names
600
601 return 0;
602 }
603
604
605 /******************************************************************************
606 * This function will return the pci_func, given bus and devfunc, or NULL. It
607 * is called from visit routines
608 ******************************************************************************/
609
610 static struct pci_func *ibm_slot_find(u8 busno, u8 device, u8 function)
611 {
612 struct pci_func *func_cur;
613 struct slot *slot_cur;
614 list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
615 if (slot_cur->func) {
616 func_cur = slot_cur->func;
617 while (func_cur) {
618 if ((func_cur->busno == busno) &&
619 (func_cur->device == device) &&
620 (func_cur->function == function))
621 return func_cur;
622 func_cur = func_cur->next;
623 }
624 }
625 }
626 return NULL;
627 }
628
629 /*************************************************************
630 * This routine frees up memory used by struct slot, including
631 * the pointers to pci_func, bus, hotplug_slot, controller,
632 * and deregistering from the hotplug core
633 *************************************************************/
634 static void free_slots(void)
635 {
636 struct slot *slot_cur, *next;
637
638 debug("%s -- enter\n", __func__);
639
640 list_for_each_entry_safe(slot_cur, next, &ibmphp_slot_head,
641 ibm_slot_list) {
642 pci_hp_del(&slot_cur->hotplug_slot);
643 slot_cur->ctrl = NULL;
644 slot_cur->bus_on = NULL;
645
646 /*
647 * We don't want to actually remove the resources,
648 * since ibmphp_free_resources() will do just that.
649 */
650 ibmphp_unconfigure_card(&slot_cur, -1);
651
652 pci_hp_destroy(&slot_cur->hotplug_slot);
653 kfree(slot_cur);
654 }
655 debug("%s -- exit\n", __func__);
656 }
657
658 static void ibm_unconfigure_device(struct pci_func *func)
659 {
660 struct pci_dev *temp;
661 u8 j;
662
663 debug("inside %s\n", __func__);
664 debug("func->device = %x, func->function = %x\n",
665 func->device, func->function);
666 debug("func->device << 3 | 0x0 = %x\n", func->device << 3 | 0x0);
667
668 pci_lock_rescan_remove();
669
670 for (j = 0; j < 0x08; j++) {
671 temp = pci_get_domain_bus_and_slot(0, func->busno,
672 (func->device << 3) | j);
673 if (temp) {
674 pci_stop_and_remove_bus_device(temp);
675 pci_dev_put(temp);
676 }
677 }
678
679 pci_dev_put(func->dev);
680
681 pci_unlock_rescan_remove();
682 }
683
684 /*
685 * The following function is to fix kernel bug regarding
686 * getting bus entries, here we manually add those primary
687 * bus entries to kernel bus structure whenever apply
688 */
689 static u8 bus_structure_fixup(u8 busno)
690 {
691 struct pci_bus *bus, *b;
692 struct pci_dev *dev;
693 u16 l;
694
695 if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno)))
696 return 1;
697
698 bus = kmalloc(sizeof(*bus), GFP_KERNEL);
699 if (!bus)
700 return 1;
701
702 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
703 if (!dev) {
704 kfree(bus);
705 return 1;
706 }
707
708 bus->number = busno;
709 bus->ops = ibmphp_pci_bus->ops;
710 dev->bus = bus;
711 for (dev->devfn = 0; dev->devfn < 256; dev->devfn += 8) {
712 if (!pci_read_config_word(dev, PCI_VENDOR_ID, &l) &&
713 (l != 0x0000) && (l != 0xffff)) {
714 debug("%s - Inside bus_structure_fixup()\n",
715 __func__);
716 b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
717 if (!b)
718 continue;
719
720 pci_bus_add_devices(b);
721 break;
722 }
723 }
724
725 kfree(dev);
726 kfree(bus);
727
728 return 0;
729 }
730
731 static int ibm_configure_device(struct pci_func *func)
732 {
733 struct pci_bus *child;
734 int num;
735 int flag = 0; /* this is to make sure we don't double scan the bus,
736 for bridged devices primarily */
737
738 pci_lock_rescan_remove();
739
740 if (!(bus_structure_fixup(func->busno)))
741 flag = 1;
742 if (func->dev == NULL)
743 func->dev = pci_get_domain_bus_and_slot(0, func->busno,
744 PCI_DEVFN(func->device, func->function));
745
746 if (func->dev == NULL) {
747 struct pci_bus *bus = pci_find_bus(0, func->busno);
748 if (!bus)
749 goto out;
750
751 num = pci_scan_slot(bus,
752 PCI_DEVFN(func->device, func->function));
753 if (num)
754 pci_bus_add_devices(bus);
755
756 func->dev = pci_get_domain_bus_and_slot(0, func->busno,
757 PCI_DEVFN(func->device, func->function));
758 if (func->dev == NULL) {
759 err("ERROR... : pci_dev still NULL\n");
760 goto out;
761 }
762 }
763 if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) {
764 pci_hp_add_bridge(func->dev);
765 child = func->dev->subordinate;
766 if (child)
767 pci_bus_add_devices(child);
768 }
769
770 out:
771 pci_unlock_rescan_remove();
772 return 0;
773 }
774
775 /*******************************************************
776 * Returns whether the bus is empty or not
777 *******************************************************/
778 static int is_bus_empty(struct slot *slot_cur)
779 {
780 int rc;
781 struct slot *tmp_slot;
782 u8 i = slot_cur->bus_on->slot_min;
783
784 while (i <= slot_cur->bus_on->slot_max) {
785 if (i == slot_cur->number) {
786 i++;
787 continue;
788 }
789 tmp_slot = ibmphp_get_slot_from_physical_num(i);
790 if (!tmp_slot)
791 return 0;
792 rc = slot_update(&tmp_slot);
793 if (rc)
794 return 0;
795 if (SLOT_PRESENT(tmp_slot->status) &&
796 SLOT_PWRGD(tmp_slot->status))
797 return 0;
798 i++;
799 }
800 return 1;
801 }
802
803 /***********************************************************
804 * If the HPC permits and the bus currently empty, tries to set the
805 * bus speed and mode at the maximum card and bus capability
806 * Parameters: slot
807 * Returns: bus is set (0) or error code
808 ***********************************************************/
809 static int set_bus(struct slot *slot_cur)
810 {
811 int rc;
812 u8 speed;
813 u8 cmd = 0x0;
814 int retval;
815 static const struct pci_device_id ciobx[] = {
816 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, 0x0101) },
817 { },
818 };
819
820 debug("%s - entry slot # %d\n", __func__, slot_cur->number);
821 if (SET_BUS_STATUS(slot_cur->ctrl) && is_bus_empty(slot_cur)) {
822 rc = slot_update(&slot_cur);
823 if (rc)
824 return rc;
825 speed = SLOT_SPEED(slot_cur->ext_status);
826 debug("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed);
827 switch (speed) {
828 case HPC_SLOT_SPEED_33:
829 cmd = HPC_BUS_33CONVMODE;
830 break;
831 case HPC_SLOT_SPEED_66:
832 if (SLOT_PCIX(slot_cur->ext_status)) {
833 if ((slot_cur->supported_speed >= BUS_SPEED_66) &&
834 (slot_cur->supported_bus_mode == BUS_MODE_PCIX))
835 cmd = HPC_BUS_66PCIXMODE;
836 else if (!SLOT_BUS_MODE(slot_cur->ext_status))
837 /* if max slot/bus capability is 66 pci
838 and there's no bus mode mismatch, then
839 the adapter supports 66 pci */
840 cmd = HPC_BUS_66CONVMODE;
841 else
842 cmd = HPC_BUS_33CONVMODE;
843 } else {
844 if (slot_cur->supported_speed >= BUS_SPEED_66)
845 cmd = HPC_BUS_66CONVMODE;
846 else
847 cmd = HPC_BUS_33CONVMODE;
848 }
849 break;
850 case HPC_SLOT_SPEED_133:
851 switch (slot_cur->supported_speed) {
852 case BUS_SPEED_33:
853 cmd = HPC_BUS_33CONVMODE;
854 break;
855 case BUS_SPEED_66:
856 if (slot_cur->supported_bus_mode == BUS_MODE_PCIX)
857 cmd = HPC_BUS_66PCIXMODE;
858 else
859 cmd = HPC_BUS_66CONVMODE;
860 break;
861 case BUS_SPEED_100:
862 cmd = HPC_BUS_100PCIXMODE;
863 break;
864 case BUS_SPEED_133:
865 /* This is to take care of the bug in CIOBX chip */
866 if (pci_dev_present(ciobx))
867 ibmphp_hpc_writeslot(slot_cur,
868 HPC_BUS_100PCIXMODE);
869 cmd = HPC_BUS_133PCIXMODE;
870 break;
871 default:
872 err("Wrong bus speed\n");
873 return -ENODEV;
874 }
875 break;
876 default:
877 err("wrong slot speed\n");
878 return -ENODEV;
879 }
880 debug("setting bus speed for slot %d, cmd %x\n",
881 slot_cur->number, cmd);
882 retval = ibmphp_hpc_writeslot(slot_cur, cmd);
883 if (retval) {
884 err("setting bus speed failed\n");
885 return retval;
886 }
887 if (CTLR_RESULT(slot_cur->ctrl->status)) {
888 err("command not completed successfully in set_bus\n");
889 return -EIO;
890 }
891 }
892 /* This is for x440, once Brandon fixes the firmware,
893 will not need this delay */
894 msleep(1000);
895 debug("%s -Exit\n", __func__);
896 return 0;
897 }
898
899 /* This routine checks the bus limitations that the slot is on from the BIOS.
900 * This is used in deciding whether or not to power up the slot.
901 * (electrical/spec limitations. For example, >1 133 MHz or >2 66 PCI cards on
902 * same bus)
903 * Parameters: slot
904 * Returns: 0 = no limitations, -EINVAL = exceeded limitations on the bus
905 */
906 static int check_limitations(struct slot *slot_cur)
907 {
908 u8 i;
909 struct slot *tmp_slot;
910 u8 count = 0;
911 u8 limitation = 0;
912
913 for (i = slot_cur->bus_on->slot_min; i <= slot_cur->bus_on->slot_max; i++) {
914 tmp_slot = ibmphp_get_slot_from_physical_num(i);
915 if (!tmp_slot)
916 return -ENODEV;
917 if ((SLOT_PWRGD(tmp_slot->status)) &&
918 !(SLOT_CONNECT(tmp_slot->status)))
919 count++;
920 }
921 get_cur_bus_info(&slot_cur);
922 switch (slot_cur->bus_on->current_speed) {
923 case BUS_SPEED_33:
924 limitation = slot_cur->bus_on->slots_at_33_conv;
925 break;
926 case BUS_SPEED_66:
927 if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX)
928 limitation = slot_cur->bus_on->slots_at_66_pcix;
929 else
930 limitation = slot_cur->bus_on->slots_at_66_conv;
931 break;
932 case BUS_SPEED_100:
933 limitation = slot_cur->bus_on->slots_at_100_pcix;
934 break;
935 case BUS_SPEED_133:
936 limitation = slot_cur->bus_on->slots_at_133_pcix;
937 break;
938 }
939
940 if ((count + 1) > limitation)
941 return -EINVAL;
942 return 0;
943 }
944
945 static inline void print_card_capability(struct slot *slot_cur)
946 {
947 info("capability of the card is ");
948 if ((slot_cur->ext_status & CARD_INFO) == PCIX133)
949 info(" 133 MHz PCI-X\n");
950 else if ((slot_cur->ext_status & CARD_INFO) == PCIX66)
951 info(" 66 MHz PCI-X\n");
952 else if ((slot_cur->ext_status & CARD_INFO) == PCI66)
953 info(" 66 MHz PCI\n");
954 else
955 info(" 33 MHz PCI\n");
956
957 }
958
959 /* This routine will power on the slot, configure the device(s) and find the
960 * drivers for them.
961 * Parameters: hotplug_slot
962 * Returns: 0 or failure codes
963 */
964 static int enable_slot(struct hotplug_slot *hs)
965 {
966 int rc, i, rcpr;
967 struct slot *slot_cur;
968 u8 function;
969 struct pci_func *tmp_func;
970
971 ibmphp_lock_operations();
972
973 debug("ENABLING SLOT........\n");
974 slot_cur = to_slot(hs);
975
976 rc = validate(slot_cur, ENABLE);
977 if (rc) {
978 err("validate function failed\n");
979 goto error_nopower;
980 }
981
982 attn_LED_blink(slot_cur);
983
984 rc = set_bus(slot_cur);
985 if (rc) {
986 err("was not able to set the bus\n");
987 goto error_nopower;
988 }
989
990 /*-----------------debugging------------------------------*/
991 get_cur_bus_info(&slot_cur);
992 debug("the current bus speed right after set_bus = %x\n",
993 slot_cur->bus_on->current_speed);
994 /*----------------------------------------------------------*/
995
996 rc = check_limitations(slot_cur);
997 if (rc) {
998 err("Adding this card exceeds the limitations of this bus.\n");
999 err("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus.\n");
1000 err("Try hot-adding into another bus\n");
1001 rc = -EINVAL;
1002 goto error_nopower;
1003 }
1004
1005 rc = power_on(slot_cur);
1006
1007 if (rc) {
1008 err("something wrong when powering up... please see below for details\n");
1009 /* need to turn off before on, otherwise, blinking overwrites */
1010 attn_off(slot_cur);
1011 attn_on(slot_cur);
1012 if (slot_update(&slot_cur)) {
1013 attn_off(slot_cur);
1014 attn_on(slot_cur);
1015 rc = -ENODEV;
1016 goto exit;
1017 }
1018 /* Check to see the error of why it failed */
1019 if ((SLOT_POWER(slot_cur->status)) &&
1020 !(SLOT_PWRGD(slot_cur->status)))
1021 err("power fault occurred trying to power up\n");
1022 else if (SLOT_BUS_SPEED(slot_cur->status)) {
1023 err("bus speed mismatch occurred. please check current bus speed and card capability\n");
1024 print_card_capability(slot_cur);
1025 } else if (SLOT_BUS_MODE(slot_cur->ext_status)) {
1026 err("bus mode mismatch occurred. please check current bus mode and card capability\n");
1027 print_card_capability(slot_cur);
1028 }
1029 ibmphp_update_slot_info(slot_cur);
1030 goto exit;
1031 }
1032 debug("after power_on\n");
1033 /*-----------------------debugging---------------------------*/
1034 get_cur_bus_info(&slot_cur);
1035 debug("the current bus speed right after power_on = %x\n",
1036 slot_cur->bus_on->current_speed);
1037 /*----------------------------------------------------------*/
1038
1039 rc = slot_update(&slot_cur);
1040 if (rc)
1041 goto error_power;
1042
1043 rc = -EINVAL;
1044 if (SLOT_POWER(slot_cur->status) && !(SLOT_PWRGD(slot_cur->status))) {
1045 err("power fault occurred trying to power up...\n");
1046 goto error_power;
1047 }
1048 if (SLOT_POWER(slot_cur->status) && (SLOT_BUS_SPEED(slot_cur->status))) {
1049 err("bus speed mismatch occurred. please check current bus speed and card capability\n");
1050 print_card_capability(slot_cur);
1051 goto error_power;
1052 }
1053 /* Don't think this case will happen after above checks...
1054 * but just in case, for paranoia sake */
1055 if (!(SLOT_POWER(slot_cur->status))) {
1056 err("power on failed...\n");
1057 goto error_power;
1058 }
1059
1060 slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
1061 if (!slot_cur->func) {
1062 /* do update_slot_info here? */
1063 rc = -ENOMEM;
1064 goto error_power;
1065 }
1066 slot_cur->func->busno = slot_cur->bus;
1067 slot_cur->func->device = slot_cur->device;
1068 for (i = 0; i < 4; i++)
1069 slot_cur->func->irq[i] = slot_cur->irq[i];
1070
1071 debug("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n",
1072 slot_cur->bus, slot_cur->device);
1073
1074 if (ibmphp_configure_card(slot_cur->func, slot_cur->number)) {
1075 err("configure_card was unsuccessful...\n");
1076 /* true because don't need to actually deallocate resources,
1077 * just remove references */
1078 ibmphp_unconfigure_card(&slot_cur, 1);
1079 debug("after unconfigure_card\n");
1080 slot_cur->func = NULL;
1081 rc = -ENOMEM;
1082 goto error_power;
1083 }
1084
1085 function = 0x00;
1086 do {
1087 tmp_func = ibm_slot_find(slot_cur->bus, slot_cur->func->device,
1088 function++);
1089 if (tmp_func && !(tmp_func->dev))
1090 ibm_configure_device(tmp_func);
1091 } while (tmp_func);
1092
1093 attn_off(slot_cur);
1094 if (slot_update(&slot_cur)) {
1095 rc = -EFAULT;
1096 goto exit;
1097 }
1098 ibmphp_print_test();
1099 rc = ibmphp_update_slot_info(slot_cur);
1100 exit:
1101 ibmphp_unlock_operations();
1102 return rc;
1103
1104 error_nopower:
1105 attn_off(slot_cur); /* need to turn off if was blinking b4 */
1106 attn_on(slot_cur);
1107 error_cont:
1108 rcpr = slot_update(&slot_cur);
1109 if (rcpr) {
1110 rc = rcpr;
1111 goto exit;
1112 }
1113 ibmphp_update_slot_info(slot_cur);
1114 goto exit;
1115
1116 error_power:
1117 attn_off(slot_cur); /* need to turn off if was blinking b4 */
1118 attn_on(slot_cur);
1119 rcpr = power_off(slot_cur);
1120 if (rcpr) {
1121 rc = rcpr;
1122 goto exit;
1123 }
1124 goto error_cont;
1125 }
1126
1127 /**************************************************************
1128 * HOT REMOVING ADAPTER CARD *
1129 * INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE *
1130 * OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE *
1131 * DISABLE POWER , *
1132 **************************************************************/
1133 static int ibmphp_disable_slot(struct hotplug_slot *hotplug_slot)
1134 {
1135 struct slot *slot = to_slot(hotplug_slot);
1136 int rc;
1137
1138 ibmphp_lock_operations();
1139 rc = ibmphp_do_disable_slot(slot);
1140 ibmphp_unlock_operations();
1141 return rc;
1142 }
1143
1144 int ibmphp_do_disable_slot(struct slot *slot_cur)
1145 {
1146 int rc;
1147 u8 flag;
1148
1149 debug("DISABLING SLOT...\n");
1150
1151 if ((slot_cur == NULL) || (slot_cur->ctrl == NULL))
1152 return -ENODEV;
1153
1154 flag = slot_cur->flag;
1155 slot_cur->flag = 1;
1156
1157 if (flag == 1) {
1158 rc = validate(slot_cur, DISABLE);
1159 /* checking if powered off already & valid slot # */
1160 if (rc)
1161 goto error;
1162 }
1163 attn_LED_blink(slot_cur);
1164
1165 if (slot_cur->func == NULL) {
1166 /* We need this for functions that were there on bootup */
1167 slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
1168 if (!slot_cur->func) {
1169 rc = -ENOMEM;
1170 goto error;
1171 }
1172 slot_cur->func->busno = slot_cur->bus;
1173 slot_cur->func->device = slot_cur->device;
1174 }
1175
1176 ibm_unconfigure_device(slot_cur->func);
1177
1178 /*
1179 * If we got here from latch suddenly opening on operating card or
1180 * a power fault, there's no power to the card, so cannot
1181 * read from it to determine what resources it occupied. This operation
1182 * is forbidden anyhow. The best we can do is remove it from kernel
1183 * lists at least */
1184
1185 if (!flag) {
1186 attn_off(slot_cur);
1187 return 0;
1188 }
1189
1190 rc = ibmphp_unconfigure_card(&slot_cur, 0);
1191 slot_cur->func = NULL;
1192 debug("in disable_slot. after unconfigure_card\n");
1193 if (rc) {
1194 err("could not unconfigure card.\n");
1195 goto error;
1196 }
1197
1198 rc = ibmphp_hpc_writeslot(slot_cur, HPC_SLOT_OFF);
1199 if (rc)
1200 goto error;
1201
1202 attn_off(slot_cur);
1203 rc = slot_update(&slot_cur);
1204 if (rc)
1205 goto exit;
1206
1207 rc = ibmphp_update_slot_info(slot_cur);
1208 ibmphp_print_test();
1209 exit:
1210 return rc;
1211
1212 error:
1213 /* Need to turn off if was blinking b4 */
1214 attn_off(slot_cur);
1215 attn_on(slot_cur);
1216 if (slot_update(&slot_cur)) {
1217 rc = -EFAULT;
1218 goto exit;
1219 }
1220 if (flag)
1221 ibmphp_update_slot_info(slot_cur);
1222 goto exit;
1223 }
1224
1225 const struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
1226 .set_attention_status = set_attention_status,
1227 .enable_slot = enable_slot,
1228 .disable_slot = ibmphp_disable_slot,
1229 .hardware_test = NULL,
1230 .get_power_status = get_power_status,
1231 .get_attention_status = get_attention_status,
1232 .get_latch_status = get_latch_status,
1233 .get_adapter_status = get_adapter_present,
1234 /* .get_max_adapter_speed = get_max_adapter_speed,
1235 .get_bus_name_status = get_bus_name,
1236 */
1237 };
1238
1239 static void ibmphp_unload(void)
1240 {
1241 free_slots();
1242 debug("after slots\n");
1243 ibmphp_free_resources();
1244 debug("after resources\n");
1245 ibmphp_free_bus_info_queue();
1246 debug("after bus info\n");
1247 ibmphp_free_ebda_hpc_queue();
1248 debug("after ebda hpc\n");
1249 ibmphp_free_ebda_pci_rsrc_queue();
1250 debug("after ebda pci rsrc\n");
1251 kfree(ibmphp_pci_bus);
1252 }
1253
1254 static int __init ibmphp_init(void)
1255 {
1256 struct pci_bus *bus;
1257 int i = 0;
1258 int rc = 0;
1259
1260 init_flag = 1;
1261
1262 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
1263
1264 ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL);
1265 if (!ibmphp_pci_bus) {
1266 rc = -ENOMEM;
1267 goto exit;
1268 }
1269
1270 bus = pci_find_bus(0, 0);
1271 if (!bus) {
1272 err("Can't find the root pci bus, can not continue\n");
1273 rc = -ENODEV;
1274 goto error;
1275 }
1276 memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus));
1277
1278 ibmphp_debug = debug;
1279
1280 for (i = 0; i < 16; i++)
1281 irqs[i] = 0;
1282
1283 rc = ibmphp_access_ebda();
1284 if (rc)
1285 goto error;
1286 debug("after ibmphp_access_ebda()\n");
1287
1288 rc = ibmphp_rsrc_init();
1289 if (rc)
1290 goto error;
1291 debug("AFTER Resource & EBDA INITIALIZATIONS\n");
1292
1293 max_slots = get_max_slots();
1294
1295 rc = ibmphp_register_pci();
1296 if (rc)
1297 goto error;
1298
1299 if (init_ops()) {
1300 rc = -ENODEV;
1301 goto error;
1302 }
1303
1304 ibmphp_print_test();
1305 rc = ibmphp_hpc_start_poll_thread();
1306 if (rc)
1307 goto error;
1308
1309 exit:
1310 return rc;
1311
1312 error:
1313 ibmphp_unload();
1314 goto exit;
1315 }
1316
1317 static void __exit ibmphp_exit(void)
1318 {
1319 ibmphp_hpc_stop_poll_thread();
1320 debug("after polling\n");
1321 ibmphp_unload();
1322 debug("done\n");
1323 }
1324
1325 module_init(ibmphp_init);
1326 module_exit(ibmphp_exit);
Linux with added FPC-III support