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);
1327