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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / drivers / pci / hotplug / cpqphp_core.c
blob16bbb183695acc020f2478d6499ae3736b419c03
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Compaq Hot Plug Controller Driver
4 *
5 * Copyright (C) 1995,2001 Compaq Computer Corporation
6 * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2001 IBM Corp.
8 *
9 * All rights reserved.
10 *
11 * Send feedback to <greg@kroah.com>
12 *
13 * Jan 12, 2003 - Added 66/100/133MHz PCI-X support,
14 * Torben Mathiasen <torben.mathiasen@hp.com>
15 */
16
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/kernel.h>
20 #include <linux/types.h>
21 #include <linux/proc_fs.h>
22 #include <linux/slab.h>
23 #include <linux/workqueue.h>
24 #include <linux/pci.h>
25 #include <linux/pci_hotplug.h>
26 #include <linux/init.h>
27 #include <linux/interrupt.h>
28
29 #include <linux/uaccess.h>
30
31 #include "cpqphp.h"
32 #include "cpqphp_nvram.h"
33
34
35 /* Global variables */
36 int cpqhp_debug;
37 int cpqhp_legacy_mode;
38 struct controller *cpqhp_ctrl_list; /* = NULL */
39 struct pci_func *cpqhp_slot_list[256];
40 struct irq_routing_table *cpqhp_routing_table;
41
42 /* local variables */
43 static void __iomem *smbios_table;
44 static void __iomem *smbios_start;
45 static void __iomem *cpqhp_rom_start;
46 static bool power_mode;
47 static bool debug;
48 static int initialized;
49
50 #define DRIVER_VERSION "0.9.8"
51 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>"
52 #define DRIVER_DESC "Compaq Hot Plug PCI Controller Driver"
53
54 MODULE_AUTHOR(DRIVER_AUTHOR);
55 MODULE_DESCRIPTION(DRIVER_DESC);
56 MODULE_LICENSE("GPL");
57
58 module_param(power_mode, bool, 0644);
59 MODULE_PARM_DESC(power_mode, "Power mode enabled or not");
60
61 module_param(debug, bool, 0644);
62 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
63
64 #define CPQHPC_MODULE_MINOR 208
65
66 static inline int is_slot64bit(struct slot *slot)
67 {
68 return (readb(slot->p_sm_slot + SMBIOS_SLOT_WIDTH) == 0x06) ? 1 : 0;
69 }
70
71 static inline int is_slot66mhz(struct slot *slot)
72 {
73 return (readb(slot->p_sm_slot + SMBIOS_SLOT_TYPE) == 0x0E) ? 1 : 0;
74 }
75
76 /**
77 * detect_SMBIOS_pointer - find the System Management BIOS Table in mem region.
78 * @begin: begin pointer for region to be scanned.
79 * @end: end pointer for region to be scanned.
80 *
81 * Returns pointer to the head of the SMBIOS tables (or %NULL).
82 */
83 static void __iomem *detect_SMBIOS_pointer(void __iomem *begin, void __iomem *end)
84 {
85 void __iomem *fp;
86 void __iomem *endp;
87 u8 temp1, temp2, temp3, temp4;
88 int status = 0;
89
90 endp = (end - sizeof(u32) + 1);
91
92 for (fp = begin; fp <= endp; fp += 16) {
93 temp1 = readb(fp);
94 temp2 = readb(fp+1);
95 temp3 = readb(fp+2);
96 temp4 = readb(fp+3);
97 if (temp1 == '_' &&
98 temp2 == 'S' &&
99 temp3 == 'M' &&
100 temp4 == '_') {
101 status = 1;
102 break;
103 }
104 }
105
106 if (!status)
107 fp = NULL;
108
109 dbg("Discovered SMBIOS Entry point at %p\n", fp);
110
111 return fp;
112 }
113
114 /**
115 * init_SERR - Initializes the per slot SERR generation.
116 * @ctrl: controller to use
117 *
118 * For unexpected switch opens
119 */
120 static int init_SERR(struct controller *ctrl)
121 {
122 u32 tempdword;
123 u32 number_of_slots;
124
125 if (!ctrl)
126 return 1;
127
128 tempdword = ctrl->first_slot;
129
130 number_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0F;
131 /* Loop through slots */
132 while (number_of_slots) {
133 writeb(0, ctrl->hpc_reg + SLOT_SERR);
134 tempdword++;
135 number_of_slots--;
136 }
137
138 return 0;
139 }
140
141 static int init_cpqhp_routing_table(void)
142 {
143 int len;
144
145 cpqhp_routing_table = pcibios_get_irq_routing_table();
146 if (cpqhp_routing_table == NULL)
147 return -ENOMEM;
148
149 len = cpqhp_routing_table_length();
150 if (len == 0) {
151 kfree(cpqhp_routing_table);
152 cpqhp_routing_table = NULL;
153 return -1;
154 }
155
156 return 0;
157 }
158
159 /* nice debugging output */
160 static void pci_print_IRQ_route(void)
161 {
162 int len;
163 int loop;
164 u8 tbus, tdevice, tslot;
165
166 len = cpqhp_routing_table_length();
167
168 dbg("bus dev func slot\n");
169 for (loop = 0; loop < len; ++loop) {
170 tbus = cpqhp_routing_table->slots[loop].bus;
171 tdevice = cpqhp_routing_table->slots[loop].devfn;
172 tslot = cpqhp_routing_table->slots[loop].slot;
173 dbg("%d %d %d %d\n", tbus, tdevice >> 3, tdevice & 0x7, tslot);
174
175 }
176 return;
177 }
178
179
180 /**
181 * get_subsequent_smbios_entry: get the next entry from bios table.
182 * @smbios_start: where to start in the SMBIOS table
183 * @smbios_table: location of the SMBIOS table
184 * @curr: %NULL or pointer to previously returned structure
185 *
186 * Gets the first entry if previous == NULL;
187 * otherwise, returns the next entry.
188 * Uses global SMBIOS Table pointer.
189 *
190 * Returns a pointer to an SMBIOS structure or NULL if none found.
191 */
192 static void __iomem *get_subsequent_smbios_entry(void __iomem *smbios_start,
193 void __iomem *smbios_table,
194 void __iomem *curr)
195 {
196 u8 bail = 0;
197 u8 previous_byte = 1;
198 void __iomem *p_temp;
199 void __iomem *p_max;
200
201 if (!smbios_table || !curr)
202 return NULL;
203
204 /* set p_max to the end of the table */
205 p_max = smbios_start + readw(smbios_table + ST_LENGTH);
206
207 p_temp = curr;
208 p_temp += readb(curr + SMBIOS_GENERIC_LENGTH);
209
210 while ((p_temp < p_max) && !bail) {
211 /* Look for the double NULL terminator
212 * The first condition is the previous byte
213 * and the second is the curr
214 */
215 if (!previous_byte && !(readb(p_temp)))
216 bail = 1;
217
218 previous_byte = readb(p_temp);
219 p_temp++;
220 }
221
222 if (p_temp < p_max)
223 return p_temp;
224 else
225 return NULL;
226 }
227
228
229 /**
230 * get_SMBIOS_entry - return the requested SMBIOS entry or %NULL
231 * @smbios_start: where to start in the SMBIOS table
232 * @smbios_table: location of the SMBIOS table
233 * @type: SMBIOS structure type to be returned
234 * @previous: %NULL or pointer to previously returned structure
235 *
236 * Gets the first entry of the specified type if previous == %NULL;
237 * Otherwise, returns the next entry of the given type.
238 * Uses global SMBIOS Table pointer.
239 * Uses get_subsequent_smbios_entry.
240 *
241 * Returns a pointer to an SMBIOS structure or %NULL if none found.
242 */
243 static void __iomem *get_SMBIOS_entry(void __iomem *smbios_start,
244 void __iomem *smbios_table,
245 u8 type,
246 void __iomem *previous)
247 {
248 if (!smbios_table)
249 return NULL;
250
251 if (!previous)
252 previous = smbios_start;
253 else
254 previous = get_subsequent_smbios_entry(smbios_start,
255 smbios_table, previous);
256
257 while (previous)
258 if (readb(previous + SMBIOS_GENERIC_TYPE) != type)
259 previous = get_subsequent_smbios_entry(smbios_start,
260 smbios_table, previous);
261 else
262 break;
263
264 return previous;
265 }
266
267 static int ctrl_slot_cleanup(struct controller *ctrl)
268 {
269 struct slot *old_slot, *next_slot;
270
271 old_slot = ctrl->slot;
272 ctrl->slot = NULL;
273
274 while (old_slot) {
275 next_slot = old_slot->next;
276 pci_hp_deregister(&old_slot->hotplug_slot);
277 kfree(old_slot);
278 old_slot = next_slot;
279 }
280
281 cpqhp_remove_debugfs_files(ctrl);
282
283 /* Free IRQ associated with hot plug device */
284 free_irq(ctrl->interrupt, ctrl);
285 /* Unmap the memory */
286 iounmap(ctrl->hpc_reg);
287 /* Finally reclaim PCI mem */
288 release_mem_region(pci_resource_start(ctrl->pci_dev, 0),
289 pci_resource_len(ctrl->pci_dev, 0));
290
291 return 0;
292 }
293
294
295 /**
296 * get_slot_mapping - determine logical slot mapping for PCI device
297 *
298 * Won't work for more than one PCI-PCI bridge in a slot.
299 *
300 * @bus_num - bus number of PCI device
301 * @dev_num - device number of PCI device
302 * @slot - Pointer to u8 where slot number will be returned
303 *
304 * Output: SUCCESS or FAILURE
305 */
306 static int
307 get_slot_mapping(struct pci_bus *bus, u8 bus_num, u8 dev_num, u8 *slot)
308 {
309 u32 work;
310 long len;
311 long loop;
312
313 u8 tbus, tdevice, tslot, bridgeSlot;
314
315 dbg("%s: %p, %d, %d, %p\n", __func__, bus, bus_num, dev_num, slot);
316
317 bridgeSlot = 0xFF;
318
319 len = cpqhp_routing_table_length();
320 for (loop = 0; loop < len; ++loop) {
321 tbus = cpqhp_routing_table->slots[loop].bus;
322 tdevice = cpqhp_routing_table->slots[loop].devfn >> 3;
323 tslot = cpqhp_routing_table->slots[loop].slot;
324
325 if ((tbus == bus_num) && (tdevice == dev_num)) {
326 *slot = tslot;
327 return 0;
328 } else {
329 /* Did not get a match on the target PCI device. Check
330 * if the current IRQ table entry is a PCI-to-PCI
331 * bridge device. If so, and it's secondary bus
332 * matches the bus number for the target device, I need
333 * to save the bridge's slot number. If I can not find
334 * an entry for the target device, I will have to
335 * assume it's on the other side of the bridge, and
336 * assign it the bridge's slot.
337 */
338 bus->number = tbus;
339 pci_bus_read_config_dword(bus, PCI_DEVFN(tdevice, 0),
340 PCI_CLASS_REVISION, &work);
341
342 if ((work >> 8) == PCI_TO_PCI_BRIDGE_CLASS) {
343 pci_bus_read_config_dword(bus,
344 PCI_DEVFN(tdevice, 0),
345 PCI_PRIMARY_BUS, &work);
346 // See if bridge's secondary bus matches target bus.
347 if (((work >> 8) & 0x000000FF) == (long) bus_num)
348 bridgeSlot = tslot;
349 }
350 }
351
352 }
353
354 /* If we got here, we didn't find an entry in the IRQ mapping table for
355 * the target PCI device. If we did determine that the target device
356 * is on the other side of a PCI-to-PCI bridge, return the slot number
357 * for the bridge.
358 */
359 if (bridgeSlot != 0xFF) {
360 *slot = bridgeSlot;
361 return 0;
362 }
363 /* Couldn't find an entry in the routing table for this PCI device */
364 return -1;
365 }
366
367
368 /**
369 * cpqhp_set_attention_status - Turns the Amber LED for a slot on or off
370 * @ctrl: struct controller to use
371 * @func: PCI device/function info
372 * @status: LED control flag: 1 = LED on, 0 = LED off
373 */
374 static int
375 cpqhp_set_attention_status(struct controller *ctrl, struct pci_func *func,
376 u32 status)
377 {
378 u8 hp_slot;
379
380 if (func == NULL)
381 return 1;
382
383 hp_slot = func->device - ctrl->slot_device_offset;
384
385 /* Wait for exclusive access to hardware */
386 mutex_lock(&ctrl->crit_sect);
387
388 if (status == 1)
389 amber_LED_on(ctrl, hp_slot);
390 else if (status == 0)
391 amber_LED_off(ctrl, hp_slot);
392 else {
393 /* Done with exclusive hardware access */
394 mutex_unlock(&ctrl->crit_sect);
395 return 1;
396 }
397
398 set_SOGO(ctrl);
399
400 /* Wait for SOBS to be unset */
401 wait_for_ctrl_irq(ctrl);
402
403 /* Done with exclusive hardware access */
404 mutex_unlock(&ctrl->crit_sect);
405
406 return 0;
407 }
408
409
410 /**
411 * set_attention_status - Turns the Amber LED for a slot on or off
412 * @hotplug_slot: slot to change LED on
413 * @status: LED control flag
414 */
415 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
416 {
417 struct pci_func *slot_func;
418 struct slot *slot = to_slot(hotplug_slot);
419 struct controller *ctrl = slot->ctrl;
420 u8 bus;
421 u8 devfn;
422 u8 device;
423 u8 function;
424
425 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
426
427 if (cpqhp_get_bus_dev(ctrl, &bus, &devfn, slot->number) == -1)
428 return -ENODEV;
429
430 device = devfn >> 3;
431 function = devfn & 0x7;
432 dbg("bus, dev, fn = %d, %d, %d\n", bus, device, function);
433
434 slot_func = cpqhp_slot_find(bus, device, function);
435 if (!slot_func)
436 return -ENODEV;
437
438 return cpqhp_set_attention_status(ctrl, slot_func, status);
439 }
440
441
442 static int process_SI(struct hotplug_slot *hotplug_slot)
443 {
444 struct pci_func *slot_func;
445 struct slot *slot = to_slot(hotplug_slot);
446 struct controller *ctrl = slot->ctrl;
447 u8 bus;
448 u8 devfn;
449 u8 device;
450 u8 function;
451
452 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
453
454 if (cpqhp_get_bus_dev(ctrl, &bus, &devfn, slot->number) == -1)
455 return -ENODEV;
456
457 device = devfn >> 3;
458 function = devfn & 0x7;
459 dbg("bus, dev, fn = %d, %d, %d\n", bus, device, function);
460
461 slot_func = cpqhp_slot_find(bus, device, function);
462 if (!slot_func)
463 return -ENODEV;
464
465 slot_func->bus = bus;
466 slot_func->device = device;
467 slot_func->function = function;
468 slot_func->configured = 0;
469 dbg("board_added(%p, %p)\n", slot_func, ctrl);
470 return cpqhp_process_SI(ctrl, slot_func);
471 }
472
473
474 static int process_SS(struct hotplug_slot *hotplug_slot)
475 {
476 struct pci_func *slot_func;
477 struct slot *slot = to_slot(hotplug_slot);
478 struct controller *ctrl = slot->ctrl;
479 u8 bus;
480 u8 devfn;
481 u8 device;
482 u8 function;
483
484 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
485
486 if (cpqhp_get_bus_dev(ctrl, &bus, &devfn, slot->number) == -1)
487 return -ENODEV;
488
489 device = devfn >> 3;
490 function = devfn & 0x7;
491 dbg("bus, dev, fn = %d, %d, %d\n", bus, device, function);
492
493 slot_func = cpqhp_slot_find(bus, device, function);
494 if (!slot_func)
495 return -ENODEV;
496
497 dbg("In %s, slot_func = %p, ctrl = %p\n", __func__, slot_func, ctrl);
498 return cpqhp_process_SS(ctrl, slot_func);
499 }
500
501
502 static int hardware_test(struct hotplug_slot *hotplug_slot, u32 value)
503 {
504 struct slot *slot = to_slot(hotplug_slot);
505 struct controller *ctrl = slot->ctrl;
506
507 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
508
509 return cpqhp_hardware_test(ctrl, value);
510 }
511
512
513 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
514 {
515 struct slot *slot = to_slot(hotplug_slot);
516 struct controller *ctrl = slot->ctrl;
517
518 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
519
520 *value = get_slot_enabled(ctrl, slot);
521 return 0;
522 }
523
524 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
525 {
526 struct slot *slot = to_slot(hotplug_slot);
527 struct controller *ctrl = slot->ctrl;
528
529 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
530
531 *value = cpq_get_attention_status(ctrl, slot);
532 return 0;
533 }
534
535 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
536 {
537 struct slot *slot = to_slot(hotplug_slot);
538 struct controller *ctrl = slot->ctrl;
539
540 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
541
542 *value = cpq_get_latch_status(ctrl, slot);
543
544 return 0;
545 }
546
547 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
548 {
549 struct slot *slot = to_slot(hotplug_slot);
550 struct controller *ctrl = slot->ctrl;
551
552 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
553
554 *value = get_presence_status(ctrl, slot);
555
556 return 0;
557 }
558
559 static const struct hotplug_slot_ops cpqphp_hotplug_slot_ops = {
560 .set_attention_status = set_attention_status,
561 .enable_slot = process_SI,
562 .disable_slot = process_SS,
563 .hardware_test = hardware_test,
564 .get_power_status = get_power_status,
565 .get_attention_status = get_attention_status,
566 .get_latch_status = get_latch_status,
567 .get_adapter_status = get_adapter_status,
568 };
569
570 #define SLOT_NAME_SIZE 10
571
572 static int ctrl_slot_setup(struct controller *ctrl,
573 void __iomem *smbios_start,
574 void __iomem *smbios_table)
575 {
576 struct slot *slot;
577 struct pci_bus *bus = ctrl->pci_bus;
578 u8 number_of_slots;
579 u8 slot_device;
580 u8 slot_number;
581 u8 ctrl_slot;
582 u32 tempdword;
583 char name[SLOT_NAME_SIZE];
584 void __iomem *slot_entry = NULL;
585 int result;
586
587 dbg("%s\n", __func__);
588
589 tempdword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
590
591 number_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0F;
592 slot_device = readb(ctrl->hpc_reg + SLOT_MASK) >> 4;
593 slot_number = ctrl->first_slot;
594
595 while (number_of_slots) {
596 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
597 if (!slot) {
598 result = -ENOMEM;
599 goto error;
600 }
601
602 slot->ctrl = ctrl;
603 slot->bus = ctrl->bus;
604 slot->device = slot_device;
605 slot->number = slot_number;
606 dbg("slot->number = %u\n", slot->number);
607
608 slot_entry = get_SMBIOS_entry(smbios_start, smbios_table, 9,
609 slot_entry);
610
611 while (slot_entry && (readw(slot_entry + SMBIOS_SLOT_NUMBER) !=
612 slot->number)) {
613 slot_entry = get_SMBIOS_entry(smbios_start,
614 smbios_table, 9, slot_entry);
615 }
616
617 slot->p_sm_slot = slot_entry;
618
619 timer_setup(&slot->task_event, cpqhp_pushbutton_thread, 0);
620 slot->task_event.expires = jiffies + 5 * HZ;
621
622 /*FIXME: these capabilities aren't used but if they are
623 * they need to be correctly implemented
624 */
625 slot->capabilities |= PCISLOT_REPLACE_SUPPORTED;
626 slot->capabilities |= PCISLOT_INTERLOCK_SUPPORTED;
627
628 if (is_slot64bit(slot))
629 slot->capabilities |= PCISLOT_64_BIT_SUPPORTED;
630 if (is_slot66mhz(slot))
631 slot->capabilities |= PCISLOT_66_MHZ_SUPPORTED;
632 if (bus->cur_bus_speed == PCI_SPEED_66MHz)
633 slot->capabilities |= PCISLOT_66_MHZ_OPERATION;
634
635 ctrl_slot =
636 slot_device - (readb(ctrl->hpc_reg + SLOT_MASK) >> 4);
637
638 /* Check presence */
639 slot->capabilities |=
640 ((((~tempdword) >> 23) |
641 ((~tempdword) >> 15)) >> ctrl_slot) & 0x02;
642 /* Check the switch state */
643 slot->capabilities |=
644 ((~tempdword & 0xFF) >> ctrl_slot) & 0x01;
645 /* Check the slot enable */
646 slot->capabilities |=
647 ((read_slot_enable(ctrl) << 2) >> ctrl_slot) & 0x04;
648
649 /* register this slot with the hotplug pci core */
650 snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
651 slot->hotplug_slot.ops = &cpqphp_hotplug_slot_ops;
652
653 dbg("registering bus %d, dev %d, number %d, ctrl->slot_device_offset %d, slot %d\n",
654 slot->bus, slot->device,
655 slot->number, ctrl->slot_device_offset,
656 slot_number);
657 result = pci_hp_register(&slot->hotplug_slot,
658 ctrl->pci_dev->bus,
659 slot->device,
660 name);
661 if (result) {
662 err("pci_hp_register failed with error %d\n", result);
663 goto error_slot;
664 }
665
666 slot->next = ctrl->slot;
667 ctrl->slot = slot;
668
669 number_of_slots--;
670 slot_device++;
671 slot_number++;
672 }
673
674 return 0;
675 error_slot:
676 kfree(slot);
677 error:
678 return result;
679 }
680
681 static int one_time_init(void)
682 {
683 int loop;
684 int retval = 0;
685
686 if (initialized)
687 return 0;
688
689 power_mode = 0;
690
691 retval = init_cpqhp_routing_table();
692 if (retval)
693 goto error;
694
695 if (cpqhp_debug)
696 pci_print_IRQ_route();
697
698 dbg("Initialize + Start the notification mechanism\n");
699
700 retval = cpqhp_event_start_thread();
701 if (retval)
702 goto error;
703
704 dbg("Initialize slot lists\n");
705 for (loop = 0; loop < 256; loop++)
706 cpqhp_slot_list[loop] = NULL;
707
708 /* FIXME: We also need to hook the NMI handler eventually.
709 * this also needs to be worked with Christoph
710 * register_NMI_handler();
711 */
712 /* Map rom address */
713 cpqhp_rom_start = ioremap(ROM_PHY_ADDR, ROM_PHY_LEN);
714 if (!cpqhp_rom_start) {
715 err("Could not ioremap memory region for ROM\n");
716 retval = -EIO;
717 goto error;
718 }
719
720 /* Now, map the int15 entry point if we are on compaq specific
721 * hardware
722 */
723 compaq_nvram_init(cpqhp_rom_start);
724
725 /* Map smbios table entry point structure */
726 smbios_table = detect_SMBIOS_pointer(cpqhp_rom_start,
727 cpqhp_rom_start + ROM_PHY_LEN);
728 if (!smbios_table) {
729 err("Could not find the SMBIOS pointer in memory\n");
730 retval = -EIO;
731 goto error_rom_start;
732 }
733
734 smbios_start = ioremap(readl(smbios_table + ST_ADDRESS),
735 readw(smbios_table + ST_LENGTH));
736 if (!smbios_start) {
737 err("Could not ioremap memory region taken from SMBIOS values\n");
738 retval = -EIO;
739 goto error_smbios_start;
740 }
741
742 initialized = 1;
743
744 return retval;
745
746 error_smbios_start:
747 iounmap(smbios_start);
748 error_rom_start:
749 iounmap(cpqhp_rom_start);
750 error:
751 return retval;
752 }
753
754 static int cpqhpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
755 {
756 u8 num_of_slots = 0;
757 u8 hp_slot = 0;
758 u8 device;
759 u8 bus_cap;
760 u16 temp_word;
761 u16 vendor_id;
762 u16 subsystem_vid;
763 u16 subsystem_deviceid;
764 u32 rc;
765 struct controller *ctrl;
766 struct pci_func *func;
767 struct pci_bus *bus;
768 int err;
769
770 err = pci_enable_device(pdev);
771 if (err) {
772 printk(KERN_ERR MY_NAME ": cannot enable PCI device %s (%d)\n",
773 pci_name(pdev), err);
774 return err;
775 }
776
777 bus = pdev->subordinate;
778 if (!bus) {
779 pci_notice(pdev, "the device is not a bridge, skipping\n");
780 rc = -ENODEV;
781 goto err_disable_device;
782 }
783
784 /* Need to read VID early b/c it's used to differentiate CPQ and INTC
785 * discovery
786 */
787 vendor_id = pdev->vendor;
788 if ((vendor_id != PCI_VENDOR_ID_COMPAQ) &&
789 (vendor_id != PCI_VENDOR_ID_INTEL)) {
790 err(msg_HPC_non_compaq_or_intel);
791 rc = -ENODEV;
792 goto err_disable_device;
793 }
794 dbg("Vendor ID: %x\n", vendor_id);
795
796 dbg("revision: %d\n", pdev->revision);
797 if ((vendor_id == PCI_VENDOR_ID_COMPAQ) && (!pdev->revision)) {
798 err(msg_HPC_rev_error);
799 rc = -ENODEV;
800 goto err_disable_device;
801 }
802
803 /* Check for the proper subsystem IDs
804 * Intel uses a different SSID programming model than Compaq.
805 * For Intel, each SSID bit identifies a PHP capability.
806 * Also Intel HPCs may have RID=0.
807 */
808 if ((pdev->revision <= 2) && (vendor_id != PCI_VENDOR_ID_INTEL)) {
809 err(msg_HPC_not_supported);
810 rc = -ENODEV;
811 goto err_disable_device;
812 }
813
814 /* TODO: This code can be made to support non-Compaq or Intel
815 * subsystem IDs
816 */
817 subsystem_vid = pdev->subsystem_vendor;
818 dbg("Subsystem Vendor ID: %x\n", subsystem_vid);
819 if ((subsystem_vid != PCI_VENDOR_ID_COMPAQ) && (subsystem_vid != PCI_VENDOR_ID_INTEL)) {
820 err(msg_HPC_non_compaq_or_intel);
821 rc = -ENODEV;
822 goto err_disable_device;
823 }
824
825 ctrl = kzalloc(sizeof(struct controller), GFP_KERNEL);
826 if (!ctrl) {
827 rc = -ENOMEM;
828 goto err_disable_device;
829 }
830
831 subsystem_deviceid = pdev->subsystem_device;
832
833 info("Hot Plug Subsystem Device ID: %x\n", subsystem_deviceid);
834
835 /* Set Vendor ID, so it can be accessed later from other
836 * functions
837 */
838 ctrl->vendor_id = vendor_id;
839
840 switch (subsystem_vid) {
841 case PCI_VENDOR_ID_COMPAQ:
842 if (pdev->revision >= 0x13) { /* CIOBX */
843 ctrl->push_flag = 1;
844 ctrl->slot_switch_type = 1;
845 ctrl->push_button = 1;
846 ctrl->pci_config_space = 1;
847 ctrl->defeature_PHP = 1;
848 ctrl->pcix_support = 1;
849 ctrl->pcix_speed_capability = 1;
850 pci_read_config_byte(pdev, 0x41, &bus_cap);
851 if (bus_cap & 0x80) {
852 dbg("bus max supports 133MHz PCI-X\n");
853 bus->max_bus_speed = PCI_SPEED_133MHz_PCIX;
854 break;
855 }
856 if (bus_cap & 0x40) {
857 dbg("bus max supports 100MHz PCI-X\n");
858 bus->max_bus_speed = PCI_SPEED_100MHz_PCIX;
859 break;
860 }
861 if (bus_cap & 0x20) {
862 dbg("bus max supports 66MHz PCI-X\n");
863 bus->max_bus_speed = PCI_SPEED_66MHz_PCIX;
864 break;
865 }
866 if (bus_cap & 0x10) {
867 dbg("bus max supports 66MHz PCI\n");
868 bus->max_bus_speed = PCI_SPEED_66MHz;
869 break;
870 }
871
872 break;
873 }
874
875 switch (subsystem_deviceid) {
876 case PCI_SUB_HPC_ID:
877 /* Original 6500/7000 implementation */
878 ctrl->slot_switch_type = 1;
879 bus->max_bus_speed = PCI_SPEED_33MHz;
880 ctrl->push_button = 0;
881 ctrl->pci_config_space = 1;
882 ctrl->defeature_PHP = 1;
883 ctrl->pcix_support = 0;
884 ctrl->pcix_speed_capability = 0;
885 break;
886 case PCI_SUB_HPC_ID2:
887 /* First Pushbutton implementation */
888 ctrl->push_flag = 1;
889 ctrl->slot_switch_type = 1;
890 bus->max_bus_speed = PCI_SPEED_33MHz;
891 ctrl->push_button = 1;
892 ctrl->pci_config_space = 1;
893 ctrl->defeature_PHP = 1;
894 ctrl->pcix_support = 0;
895 ctrl->pcix_speed_capability = 0;
896 break;
897 case PCI_SUB_HPC_ID_INTC:
898 /* Third party (6500/7000) */
899 ctrl->slot_switch_type = 1;
900 bus->max_bus_speed = PCI_SPEED_33MHz;
901 ctrl->push_button = 0;
902 ctrl->pci_config_space = 1;
903 ctrl->defeature_PHP = 1;
904 ctrl->pcix_support = 0;
905 ctrl->pcix_speed_capability = 0;
906 break;
907 case PCI_SUB_HPC_ID3:
908 /* First 66 Mhz implementation */
909 ctrl->push_flag = 1;
910 ctrl->slot_switch_type = 1;
911 bus->max_bus_speed = PCI_SPEED_66MHz;
912 ctrl->push_button = 1;
913 ctrl->pci_config_space = 1;
914 ctrl->defeature_PHP = 1;
915 ctrl->pcix_support = 0;
916 ctrl->pcix_speed_capability = 0;
917 break;
918 case PCI_SUB_HPC_ID4:
919 /* First PCI-X implementation, 100MHz */
920 ctrl->push_flag = 1;
921 ctrl->slot_switch_type = 1;
922 bus->max_bus_speed = PCI_SPEED_100MHz_PCIX;
923 ctrl->push_button = 1;
924 ctrl->pci_config_space = 1;
925 ctrl->defeature_PHP = 1;
926 ctrl->pcix_support = 1;
927 ctrl->pcix_speed_capability = 0;
928 break;
929 default:
930 err(msg_HPC_not_supported);
931 rc = -ENODEV;
932 goto err_free_ctrl;
933 }
934 break;
935
936 case PCI_VENDOR_ID_INTEL:
937 /* Check for speed capability (0=33, 1=66) */
938 if (subsystem_deviceid & 0x0001)
939 bus->max_bus_speed = PCI_SPEED_66MHz;
940 else
941 bus->max_bus_speed = PCI_SPEED_33MHz;
942
943 /* Check for push button */
944 if (subsystem_deviceid & 0x0002)
945 ctrl->push_button = 0;
946 else
947 ctrl->push_button = 1;
948
949 /* Check for slot switch type (0=mechanical, 1=not mechanical) */
950 if (subsystem_deviceid & 0x0004)
951 ctrl->slot_switch_type = 0;
952 else
953 ctrl->slot_switch_type = 1;
954
955 /* PHP Status (0=De-feature PHP, 1=Normal operation) */
956 if (subsystem_deviceid & 0x0008)
957 ctrl->defeature_PHP = 1; /* PHP supported */
958 else
959 ctrl->defeature_PHP = 0; /* PHP not supported */
960
961 /* Alternate Base Address Register Interface
962 * (0=not supported, 1=supported)
963 */
964 if (subsystem_deviceid & 0x0010)
965 ctrl->alternate_base_address = 1;
966 else
967 ctrl->alternate_base_address = 0;
968
969 /* PCI Config Space Index (0=not supported, 1=supported) */
970 if (subsystem_deviceid & 0x0020)
971 ctrl->pci_config_space = 1;
972 else
973 ctrl->pci_config_space = 0;
974
975 /* PCI-X support */
976 if (subsystem_deviceid & 0x0080) {
977 ctrl->pcix_support = 1;
978 if (subsystem_deviceid & 0x0040)
979 /* 133MHz PCI-X if bit 7 is 1 */
980 ctrl->pcix_speed_capability = 1;
981 else
982 /* 100MHz PCI-X if bit 7 is 1 and bit 0 is 0, */
983 /* 66MHz PCI-X if bit 7 is 1 and bit 0 is 1 */
984 ctrl->pcix_speed_capability = 0;
985 } else {
986 /* Conventional PCI */
987 ctrl->pcix_support = 0;
988 ctrl->pcix_speed_capability = 0;
989 }
990 break;
991
992 default:
993 err(msg_HPC_not_supported);
994 rc = -ENODEV;
995 goto err_free_ctrl;
996 }
997
998 /* Tell the user that we found one. */
999 info("Initializing the PCI hot plug controller residing on PCI bus %d\n",
1000 pdev->bus->number);
1001
1002 dbg("Hotplug controller capabilities:\n");
1003 dbg(" speed_capability %d\n", bus->max_bus_speed);
1004 dbg(" slot_switch_type %s\n", ctrl->slot_switch_type ?
1005 "switch present" : "no switch");
1006 dbg(" defeature_PHP %s\n", ctrl->defeature_PHP ?
1007 "PHP supported" : "PHP not supported");
1008 dbg(" alternate_base_address %s\n", ctrl->alternate_base_address ?
1009 "supported" : "not supported");
1010 dbg(" pci_config_space %s\n", ctrl->pci_config_space ?
1011 "supported" : "not supported");
1012 dbg(" pcix_speed_capability %s\n", ctrl->pcix_speed_capability ?
1013 "supported" : "not supported");
1014 dbg(" pcix_support %s\n", ctrl->pcix_support ?
1015 "supported" : "not supported");
1016
1017 ctrl->pci_dev = pdev;
1018 pci_set_drvdata(pdev, ctrl);
1019
1020 /* make our own copy of the pci bus structure,
1021 * as we like tweaking it a lot */
1022 ctrl->pci_bus = kmemdup(pdev->bus, sizeof(*ctrl->pci_bus), GFP_KERNEL);
1023 if (!ctrl->pci_bus) {
1024 err("out of memory\n");
1025 rc = -ENOMEM;
1026 goto err_free_ctrl;
1027 }
1028
1029 ctrl->bus = pdev->bus->number;
1030 ctrl->rev = pdev->revision;
1031 dbg("bus device function rev: %d %d %d %d\n", ctrl->bus,
1032 PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), ctrl->rev);
1033
1034 mutex_init(&ctrl->crit_sect);
1035 init_waitqueue_head(&ctrl->queue);
1036
1037 /* initialize our threads if they haven't already been started up */
1038 rc = one_time_init();
1039 if (rc)
1040 goto err_free_bus;
1041
1042 dbg("pdev = %p\n", pdev);
1043 dbg("pci resource start %llx\n", (unsigned long long)pci_resource_start(pdev, 0));
1044 dbg("pci resource len %llx\n", (unsigned long long)pci_resource_len(pdev, 0));
1045
1046 if (!request_mem_region(pci_resource_start(pdev, 0),
1047 pci_resource_len(pdev, 0), MY_NAME)) {
1048 err("cannot reserve MMIO region\n");
1049 rc = -ENOMEM;
1050 goto err_free_bus;
1051 }
1052
1053 ctrl->hpc_reg = ioremap(pci_resource_start(pdev, 0),
1054 pci_resource_len(pdev, 0));
1055 if (!ctrl->hpc_reg) {
1056 err("cannot remap MMIO region %llx @ %llx\n",
1057 (unsigned long long)pci_resource_len(pdev, 0),
1058 (unsigned long long)pci_resource_start(pdev, 0));
1059 rc = -ENODEV;
1060 goto err_free_mem_region;
1061 }
1062
1063 /* Check for 66Mhz operation */
1064 bus->cur_bus_speed = get_controller_speed(ctrl);
1065
1066
1067 /********************************************************
1068 *
1069 * Save configuration headers for this and
1070 * subordinate PCI buses
1071 *
1072 ********************************************************/
1073
1074 /* find the physical slot number of the first hot plug slot */
1075
1076 /* Get slot won't work for devices behind bridges, but
1077 * in this case it will always be called for the "base"
1078 * bus/dev/func of a slot.
1079 * CS: this is leveraging the PCIIRQ routing code from the kernel
1080 * (pci-pc.c: get_irq_routing_table) */
1081 rc = get_slot_mapping(ctrl->pci_bus, pdev->bus->number,
1082 (readb(ctrl->hpc_reg + SLOT_MASK) >> 4),
1083 &(ctrl->first_slot));
1084 dbg("get_slot_mapping: first_slot = %d, returned = %d\n",
1085 ctrl->first_slot, rc);
1086 if (rc) {
1087 err(msg_initialization_err, rc);
1088 goto err_iounmap;
1089 }
1090
1091 /* Store PCI Config Space for all devices on this bus */
1092 rc = cpqhp_save_config(ctrl, ctrl->bus, readb(ctrl->hpc_reg + SLOT_MASK));
1093 if (rc) {
1094 err("%s: unable to save PCI configuration data, error %d\n",
1095 __func__, rc);
1096 goto err_iounmap;
1097 }
1098
1099 /*
1100 * Get IO, memory, and IRQ resources for new devices
1101 */
1102 /* The next line is required for cpqhp_find_available_resources */
1103 ctrl->interrupt = pdev->irq;
1104 if (ctrl->interrupt < 0x10) {
1105 cpqhp_legacy_mode = 1;
1106 dbg("System seems to be configured for Full Table Mapped MPS mode\n");
1107 }
1108
1109 ctrl->cfgspc_irq = 0;
1110 pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &ctrl->cfgspc_irq);
1111
1112 rc = cpqhp_find_available_resources(ctrl, cpqhp_rom_start);
1113 ctrl->add_support = !rc;
1114 if (rc) {
1115 dbg("cpqhp_find_available_resources = 0x%x\n", rc);
1116 err("unable to locate PCI configuration resources for hot plug add.\n");
1117 goto err_iounmap;
1118 }
1119
1120 /*
1121 * Finish setting up the hot plug ctrl device
1122 */
1123 ctrl->slot_device_offset = readb(ctrl->hpc_reg + SLOT_MASK) >> 4;
1124 dbg("NumSlots %d\n", ctrl->slot_device_offset);
1125
1126 ctrl->next_event = 0;
1127
1128 /* Setup the slot information structures */
1129 rc = ctrl_slot_setup(ctrl, smbios_start, smbios_table);
1130 if (rc) {
1131 err(msg_initialization_err, 6);
1132 err("%s: unable to save PCI configuration data, error %d\n",
1133 __func__, rc);
1134 goto err_iounmap;
1135 }
1136
1137 /* Mask all general input interrupts */
1138 writel(0xFFFFFFFFL, ctrl->hpc_reg + INT_MASK);
1139
1140 /* set up the interrupt */
1141 dbg("HPC interrupt = %d\n", ctrl->interrupt);
1142 if (request_irq(ctrl->interrupt, cpqhp_ctrl_intr,
1143 IRQF_SHARED, MY_NAME, ctrl)) {
1144 err("Can't get irq %d for the hotplug pci controller\n",
1145 ctrl->interrupt);
1146 rc = -ENODEV;
1147 goto err_iounmap;
1148 }
1149
1150 /* Enable Shift Out interrupt and clear it, also enable SERR on power
1151 * fault
1152 */
1153 temp_word = readw(ctrl->hpc_reg + MISC);
1154 temp_word |= 0x4006;
1155 writew(temp_word, ctrl->hpc_reg + MISC);
1156
1157 /* Changed 05/05/97 to clear all interrupts at start */
1158 writel(0xFFFFFFFFL, ctrl->hpc_reg + INT_INPUT_CLEAR);
1159
1160 ctrl->ctrl_int_comp = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
1161
1162 writel(0x0L, ctrl->hpc_reg + INT_MASK);
1163
1164 if (!cpqhp_ctrl_list) {
1165 cpqhp_ctrl_list = ctrl;
1166 ctrl->next = NULL;
1167 } else {
1168 ctrl->next = cpqhp_ctrl_list;
1169 cpqhp_ctrl_list = ctrl;
1170 }
1171
1172 /* turn off empty slots here unless command line option "ON" set
1173 * Wait for exclusive access to hardware
1174 */
1175 mutex_lock(&ctrl->crit_sect);
1176
1177 num_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0F;
1178
1179 /* find first device number for the ctrl */
1180 device = readb(ctrl->hpc_reg + SLOT_MASK) >> 4;
1181
1182 while (num_of_slots) {
1183 dbg("num_of_slots: %d\n", num_of_slots);
1184 func = cpqhp_slot_find(ctrl->bus, device, 0);
1185 if (!func)
1186 break;
1187
1188 hp_slot = func->device - ctrl->slot_device_offset;
1189 dbg("hp_slot: %d\n", hp_slot);
1190
1191 /* We have to save the presence info for these slots */
1192 temp_word = ctrl->ctrl_int_comp >> 16;
1193 func->presence_save = (temp_word >> hp_slot) & 0x01;
1194 func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;
1195
1196 if (ctrl->ctrl_int_comp & (0x1L << hp_slot))
1197 func->switch_save = 0;
1198 else
1199 func->switch_save = 0x10;
1200
1201 if (!power_mode)
1202 if (!func->is_a_board) {
1203 green_LED_off(ctrl, hp_slot);
1204 slot_disable(ctrl, hp_slot);
1205 }
1206
1207 device++;
1208 num_of_slots--;
1209 }
1210
1211 if (!power_mode) {
1212 set_SOGO(ctrl);
1213 /* Wait for SOBS to be unset */
1214 wait_for_ctrl_irq(ctrl);
1215 }
1216
1217 rc = init_SERR(ctrl);
1218 if (rc) {
1219 err("init_SERR failed\n");
1220 mutex_unlock(&ctrl->crit_sect);
1221 goto err_free_irq;
1222 }
1223
1224 /* Done with exclusive hardware access */
1225 mutex_unlock(&ctrl->crit_sect);
1226
1227 cpqhp_create_debugfs_files(ctrl);
1228
1229 return 0;
1230
1231 err_free_irq:
1232 free_irq(ctrl->interrupt, ctrl);
1233 err_iounmap:
1234 iounmap(ctrl->hpc_reg);
1235 err_free_mem_region:
1236 release_mem_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
1237 err_free_bus:
1238 kfree(ctrl->pci_bus);
1239 err_free_ctrl:
1240 kfree(ctrl);
1241 err_disable_device:
1242 pci_disable_device(pdev);
1243 return rc;
1244 }
1245
1246 static void __exit unload_cpqphpd(void)
1247 {
1248 struct pci_func *next;
1249 struct pci_func *TempSlot;
1250 int loop;
1251 u32 rc;
1252 struct controller *ctrl;
1253 struct controller *tctrl;
1254 struct pci_resource *res;
1255 struct pci_resource *tres;
1256
1257 rc = compaq_nvram_store(cpqhp_rom_start);
1258
1259 ctrl = cpqhp_ctrl_list;
1260
1261 while (ctrl) {
1262 if (ctrl->hpc_reg) {
1263 u16 misc;
1264 rc = read_slot_enable(ctrl);
1265
1266 writeb(0, ctrl->hpc_reg + SLOT_SERR);
1267 writel(0xFFFFFFC0L | ~rc, ctrl->hpc_reg + INT_MASK);
1268
1269 misc = readw(ctrl->hpc_reg + MISC);
1270 misc &= 0xFFFD;
1271 writew(misc, ctrl->hpc_reg + MISC);
1272 }
1273
1274 ctrl_slot_cleanup(ctrl);
1275
1276 res = ctrl->io_head;
1277 while (res) {
1278 tres = res;
1279 res = res->next;
1280 kfree(tres);
1281 }
1282
1283 res = ctrl->mem_head;
1284 while (res) {
1285 tres = res;
1286 res = res->next;
1287 kfree(tres);
1288 }
1289
1290 res = ctrl->p_mem_head;
1291 while (res) {
1292 tres = res;
1293 res = res->next;
1294 kfree(tres);
1295 }
1296
1297 res = ctrl->bus_head;
1298 while (res) {
1299 tres = res;
1300 res = res->next;
1301 kfree(tres);
1302 }
1303
1304 kfree(ctrl->pci_bus);
1305
1306 tctrl = ctrl;
1307 ctrl = ctrl->next;
1308 kfree(tctrl);
1309 }
1310
1311 for (loop = 0; loop < 256; loop++) {
1312 next = cpqhp_slot_list[loop];
1313 while (next != NULL) {
1314 res = next->io_head;
1315 while (res) {
1316 tres = res;
1317 res = res->next;
1318 kfree(tres);
1319 }
1320
1321 res = next->mem_head;
1322 while (res) {
1323 tres = res;
1324 res = res->next;
1325 kfree(tres);
1326 }
1327
1328 res = next->p_mem_head;
1329 while (res) {
1330 tres = res;
1331 res = res->next;
1332 kfree(tres);
1333 }
1334
1335 res = next->bus_head;
1336 while (res) {
1337 tres = res;
1338 res = res->next;
1339 kfree(tres);
1340 }
1341
1342 TempSlot = next;
1343 next = next->next;
1344 kfree(TempSlot);
1345 }
1346 }
1347
1348 /* Stop the notification mechanism */
1349 if (initialized)
1350 cpqhp_event_stop_thread();
1351
1352 /* unmap the rom address */
1353 if (cpqhp_rom_start)
1354 iounmap(cpqhp_rom_start);
1355 if (smbios_start)
1356 iounmap(smbios_start);
1357 }
1358
1359 static const struct pci_device_id hpcd_pci_tbl[] = {
1360 {
1361 /* handle any PCI Hotplug controller */
1362 .class = ((PCI_CLASS_SYSTEM_PCI_HOTPLUG << 8) | 0x00),
1363 .class_mask = ~0,
1364
1365 /* no matter who makes it */
1366 .vendor = PCI_ANY_ID,
1367 .device = PCI_ANY_ID,
1368 .subvendor = PCI_ANY_ID,
1369 .subdevice = PCI_ANY_ID,
1370
1371 }, { /* end: all zeroes */ }
1372 };
1373
1374 MODULE_DEVICE_TABLE(pci, hpcd_pci_tbl);
1375
1376 static struct pci_driver cpqhpc_driver = {
1377 .name = "compaq_pci_hotplug",
1378 .id_table = hpcd_pci_tbl,
1379 .probe = cpqhpc_probe,
1380 /* remove: cpqhpc_remove_one, */
1381 };
1382
1383 static int __init cpqhpc_init(void)
1384 {
1385 int result;
1386
1387 cpqhp_debug = debug;
1388
1389 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
1390 cpqhp_initialize_debugfs();
1391 result = pci_register_driver(&cpqhpc_driver);
1392 dbg("pci_register_driver = %d\n", result);
1393 return result;
1394 }
1395
1396 static void __exit cpqhpc_cleanup(void)
1397 {
1398 dbg("unload_cpqphpd()\n");
1399 unload_cpqphpd();
1400
1401 dbg("pci_unregister_driver\n");
1402 pci_unregister_driver(&cpqhpc_driver);
1403 cpqhp_shutdown_debugfs();
1404 }
1405
1406 module_init(cpqhpc_init);
1407 module_exit(cpqhpc_cleanup);
Linux with added FPC-III support