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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 ([email protected])
7 * Copyright (C) 2001 IBM Corp.
8 *
9 * All rights reserved.
10 *
11 * Send feedback to <[email protected]>
12 *
13 */
14
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/proc_fs.h>
19#include <linux/slab.h>
20#include <linux/workqueue.h>
21#include <linux/pci.h>
22#include <linux/pci_hotplug.h>
23#include <linux/uaccess.h>
24#include "cpqphp.h"
25#include "cpqphp_nvram.h"
26
27
28#define ROM_INT15_PHY_ADDR 0x0FF859
29#define READ_EV 0xD8A4
30#define WRITE_EV 0xD8A5
31
32struct register_foo {
33 union {
34 unsigned long lword; /* eax */
35 unsigned short word; /* ax */
36
37 struct {
38 unsigned char low; /* al */
39 unsigned char high; /* ah */
40 } byte;
41 } data;
42
43 unsigned char opcode; /* see below */
44 unsigned long length; /* if the reg. is a pointer, how much data */
45} __attribute__ ((packed));
46
47struct all_reg {
48 struct register_foo eax_reg;
49 struct register_foo ebx_reg;
50 struct register_foo ecx_reg;
51 struct register_foo edx_reg;
52 struct register_foo edi_reg;
53 struct register_foo esi_reg;
54 struct register_foo eflags_reg;
55} __attribute__ ((packed));
56
57
58struct ev_hrt_header {
59 u8 Version;
60 u8 num_of_ctrl;
61 u8 next;
62};
63
64struct ev_hrt_ctrl {
65 u8 bus;
66 u8 device;
67 u8 function;
68 u8 mem_avail;
69 u8 p_mem_avail;
70 u8 io_avail;
71 u8 bus_avail;
72 u8 next;
73};
74
75
76static u8 evbuffer_init;
77static u8 evbuffer_length;
78static u8 evbuffer[1024];
79
80static void __iomem *compaq_int15_entry_point;
81
82/* lock for ordering int15_bios_call() */
83static DEFINE_SPINLOCK(int15_lock);
84
85
86/* This is a series of function that deals with
87 * setting & getting the hotplug resource table in some environment variable.
88 */
89
90/*
91 * We really shouldn't be doing this unless there is a _very_ good reason to!!!
92 * greg k-h
93 */
94
95
96static u32 add_byte(u32 **p_buffer, u8 value, u32 *used, u32 *avail)
97{
98 u8 **tByte;
99
100 if ((*used + 1) > *avail)
101 return(1);
102
103 *((u8 *)*p_buffer) = value;
104 tByte = (u8 **)p_buffer;
105 (*tByte)++;
106 *used += 1;
107 return(0);
108}
109
110
111static u32 add_dword(u32 **p_buffer, u32 value, u32 *used, u32 *avail)
112{
113 if ((*used + 4) > *avail)
114 return(1);
115
116 **p_buffer = value;
117 (*p_buffer)++;
118 *used += 4;
119 return(0);
120}
121
122
123/*
124 * check_for_compaq_ROM
125 *
126 * this routine verifies that the ROM OEM string is 'COMPAQ'
127 *
128 * returns 0 for non-Compaq ROM, 1 for Compaq ROM
129 */
130static int check_for_compaq_ROM(void __iomem *rom_start)
131{
132 u8 temp1, temp2, temp3, temp4, temp5, temp6;
133 int result = 0;
134
135 temp1 = readb(rom_start + 0xffea + 0);
136 temp2 = readb(rom_start + 0xffea + 1);
137 temp3 = readb(rom_start + 0xffea + 2);
138 temp4 = readb(rom_start + 0xffea + 3);
139 temp5 = readb(rom_start + 0xffea + 4);
140 temp6 = readb(rom_start + 0xffea + 5);
141 if ((temp1 == 'C') &&
142 (temp2 == 'O') &&
143 (temp3 == 'M') &&
144 (temp4 == 'P') &&
145 (temp5 == 'A') &&
146 (temp6 == 'Q')) {
147 result = 1;
148 }
149 dbg("%s - returned %d\n", __func__, result);
150 return result;
151}
152
153
154static u32 access_EV(u16 operation, u8 *ev_name, u8 *buffer, u32 *buf_size)
155{
156 unsigned long flags;
157 int op = operation;
158 int ret_val;
159
160 if (!compaq_int15_entry_point)
161 return -ENODEV;
162
163 spin_lock_irqsave(&int15_lock, flags);
164 __asm__ (
165 "xorl %%ebx,%%ebx\n" \
166 "xorl %%edx,%%edx\n" \
167 "pushf\n" \
168 "push %%cs\n" \
169 "cli\n" \
170 "call *%6\n"
171 : "=c" (*buf_size), "=a" (ret_val)
172 : "a" (op), "c" (*buf_size), "S" (ev_name),
173 "D" (buffer), "m" (compaq_int15_entry_point)
174 : "%ebx", "%edx");
175 spin_unlock_irqrestore(&int15_lock, flags);
176
177 return((ret_val & 0xFF00) >> 8);
178}
179
180
181/*
182 * load_HRT
183 *
184 * Read the hot plug Resource Table from NVRAM
185 */
186static int load_HRT(void __iomem *rom_start)
187{
188 u32 available;
189 u32 temp_dword;
190 u8 temp_byte = 0xFF;
191 u32 rc;
192
193 if (!check_for_compaq_ROM(rom_start))
194 return -ENODEV;
195
196 available = 1024;
197
198 /* Now load the EV */
199 temp_dword = available;
200
201 rc = access_EV(READ_EV, "CQTHPS", evbuffer, &temp_dword);
202
203 evbuffer_length = temp_dword;
204
205 /* We're maintaining the resource lists so write FF to invalidate old
206 * info
207 */
208 temp_dword = 1;
209
210 rc = access_EV(WRITE_EV, "CQTHPS", &temp_byte, &temp_dword);
211
212 return rc;
213}
214
215
216/*
217 * store_HRT
218 *
219 * Save the hot plug Resource Table in NVRAM
220 */
221static u32 store_HRT(void __iomem *rom_start)
222{
223 u32 *buffer;
224 u32 *pFill;
225 u32 usedbytes;
226 u32 available;
227 u32 temp_dword;
228 u32 rc;
229 u8 loop;
230 u8 numCtrl = 0;
231 struct controller *ctrl;
232 struct pci_resource *resNode;
233 struct ev_hrt_header *p_EV_header;
234 struct ev_hrt_ctrl *p_ev_ctrl;
235
236 available = 1024;
237
238 if (!check_for_compaq_ROM(rom_start))
239 return(1);
240
241 buffer = (u32 *) evbuffer;
242
243 if (!buffer)
244 return(1);
245
246 pFill = buffer;
247 usedbytes = 0;
248
249 p_EV_header = (struct ev_hrt_header *) pFill;
250
251 ctrl = cpqhp_ctrl_list;
252
253 /* The revision of this structure */
254 rc = add_byte(&pFill, 1 + ctrl->push_flag, &usedbytes, &available);
255 if (rc)
256 return(rc);
257
258 /* The number of controllers */
259 rc = add_byte(&pFill, 1, &usedbytes, &available);
260 if (rc)
261 return(rc);
262
263 while (ctrl) {
264 p_ev_ctrl = (struct ev_hrt_ctrl *) pFill;
265
266 numCtrl++;
267
268 /* The bus number */
269 rc = add_byte(&pFill, ctrl->bus, &usedbytes, &available);
270 if (rc)
271 return(rc);
272
273 /* The device Number */
274 rc = add_byte(&pFill, PCI_SLOT(ctrl->pci_dev->devfn), &usedbytes, &available);
275 if (rc)
276 return(rc);
277
278 /* The function Number */
279 rc = add_byte(&pFill, PCI_FUNC(ctrl->pci_dev->devfn), &usedbytes, &available);
280 if (rc)
281 return(rc);
282
283 /* Skip the number of available entries */
284 rc = add_dword(&pFill, 0, &usedbytes, &available);
285 if (rc)
286 return(rc);
287
288 /* Figure out memory Available */
289
290 resNode = ctrl->mem_head;
291
292 loop = 0;
293
294 while (resNode) {
295 loop++;
296
297 /* base */
298 rc = add_dword(&pFill, resNode->base, &usedbytes, &available);
299 if (rc)
300 return(rc);
301
302 /* length */
303 rc = add_dword(&pFill, resNode->length, &usedbytes, &available);
304 if (rc)
305 return(rc);
306
307 resNode = resNode->next;
308 }
309
310 /* Fill in the number of entries */
311 p_ev_ctrl->mem_avail = loop;
312
313 /* Figure out prefetchable memory Available */
314
315 resNode = ctrl->p_mem_head;
316
317 loop = 0;
318
319 while (resNode) {
320 loop++;
321
322 /* base */
323 rc = add_dword(&pFill, resNode->base, &usedbytes, &available);
324 if (rc)
325 return(rc);
326
327 /* length */
328 rc = add_dword(&pFill, resNode->length, &usedbytes, &available);
329 if (rc)
330 return(rc);
331
332 resNode = resNode->next;
333 }
334
335 /* Fill in the number of entries */
336 p_ev_ctrl->p_mem_avail = loop;
337
338 /* Figure out IO Available */
339
340 resNode = ctrl->io_head;
341
342 loop = 0;
343
344 while (resNode) {
345 loop++;
346
347 /* base */
348 rc = add_dword(&pFill, resNode->base, &usedbytes, &available);
349 if (rc)
350 return(rc);
351
352 /* length */
353 rc = add_dword(&pFill, resNode->length, &usedbytes, &available);
354 if (rc)
355 return(rc);
356
357 resNode = resNode->next;
358 }
359
360 /* Fill in the number of entries */
361 p_ev_ctrl->io_avail = loop;
362
363 /* Figure out bus Available */
364
365 resNode = ctrl->bus_head;
366
367 loop = 0;
368
369 while (resNode) {
370 loop++;
371
372 /* base */
373 rc = add_dword(&pFill, resNode->base, &usedbytes, &available);
374 if (rc)
375 return(rc);
376
377 /* length */
378 rc = add_dword(&pFill, resNode->length, &usedbytes, &available);
379 if (rc)
380 return(rc);
381
382 resNode = resNode->next;
383 }
384
385 /* Fill in the number of entries */
386 p_ev_ctrl->bus_avail = loop;
387
388 ctrl = ctrl->next;
389 }
390
391 p_EV_header->num_of_ctrl = numCtrl;
392
393 /* Now store the EV */
394
395 temp_dword = usedbytes;
396
397 rc = access_EV(WRITE_EV, "CQTHPS", (u8 *) buffer, &temp_dword);
398
399 dbg("usedbytes = 0x%x, length = 0x%x\n", usedbytes, temp_dword);
400
401 evbuffer_length = temp_dword;
402
403 if (rc) {
404 err(msg_unable_to_save);
405 return(1);
406 }
407
408 return(0);
409}
410
411
412void compaq_nvram_init(void __iomem *rom_start)
413{
414 if (rom_start)
415 compaq_int15_entry_point = (rom_start + ROM_INT15_PHY_ADDR - ROM_PHY_ADDR);
416
417 dbg("int15 entry = %p\n", compaq_int15_entry_point);
418}
419
420
421int compaq_nvram_load(void __iomem *rom_start, struct controller *ctrl)
422{
423 u8 bus, device, function;
424 u8 nummem, numpmem, numio, numbus;
425 u32 rc;
426 u8 *p_byte;
427 struct pci_resource *mem_node;
428 struct pci_resource *p_mem_node;
429 struct pci_resource *io_node;
430 struct pci_resource *bus_node;
431 struct ev_hrt_ctrl *p_ev_ctrl;
432 struct ev_hrt_header *p_EV_header;
433
434 if (!evbuffer_init) {
435 /* Read the resource list information in from NVRAM */
436 if (load_HRT(rom_start))
437 memset(evbuffer, 0, 1024);
438
439 evbuffer_init = 1;
440 }
441
442 /* If we saved information in NVRAM, use it now */
443 p_EV_header = (struct ev_hrt_header *) evbuffer;
444
445 /* The following code is for systems where version 1.0 of this
446 * driver has been loaded, but doesn't support the hardware.
447 * In that case, the driver would incorrectly store something
448 * in NVRAM.
449 */
450 if ((p_EV_header->Version == 2) ||
451 ((p_EV_header->Version == 1) && !ctrl->push_flag)) {
452 p_byte = &(p_EV_header->next);
453
454 p_ev_ctrl = (struct ev_hrt_ctrl *) &(p_EV_header->next);
455
456 p_byte += 3;
457
458 if (p_byte > ((u8 *)p_EV_header + evbuffer_length))
459 return 2;
460
461 bus = p_ev_ctrl->bus;
462 device = p_ev_ctrl->device;
463 function = p_ev_ctrl->function;
464
465 while ((bus != ctrl->bus) ||
466 (device != PCI_SLOT(ctrl->pci_dev->devfn)) ||
467 (function != PCI_FUNC(ctrl->pci_dev->devfn))) {
468 nummem = p_ev_ctrl->mem_avail;
469 numpmem = p_ev_ctrl->p_mem_avail;
470 numio = p_ev_ctrl->io_avail;
471 numbus = p_ev_ctrl->bus_avail;
472
473 p_byte += 4;
474
475 if (p_byte > ((u8 *)p_EV_header + evbuffer_length))
476 return 2;
477
478 /* Skip forward to the next entry */
479 p_byte += (nummem + numpmem + numio + numbus) * 8;
480
481 if (p_byte > ((u8 *)p_EV_header + evbuffer_length))
482 return 2;
483
484 p_ev_ctrl = (struct ev_hrt_ctrl *) p_byte;
485
486 p_byte += 3;
487
488 if (p_byte > ((u8 *)p_EV_header + evbuffer_length))
489 return 2;
490
491 bus = p_ev_ctrl->bus;
492 device = p_ev_ctrl->device;
493 function = p_ev_ctrl->function;
494 }
495
496 nummem = p_ev_ctrl->mem_avail;
497 numpmem = p_ev_ctrl->p_mem_avail;
498 numio = p_ev_ctrl->io_avail;
499 numbus = p_ev_ctrl->bus_avail;
500
501 p_byte += 4;
502
503 if (p_byte > ((u8 *)p_EV_header + evbuffer_length))
504 return 2;
505
506 while (nummem--) {
507 mem_node = kmalloc_obj(struct pci_resource);
508
509 if (!mem_node)
510 break;
511
512 mem_node->base = *(u32 *)p_byte;
513 dbg("mem base = %8.8x\n", mem_node->base);
514 p_byte += 4;
515
516 if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) {
517 kfree(mem_node);
518 return 2;
519 }
520
521 mem_node->length = *(u32 *)p_byte;
522 dbg("mem length = %8.8x\n", mem_node->length);
523 p_byte += 4;
524
525 if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) {
526 kfree(mem_node);
527 return 2;
528 }
529
530 mem_node->next = ctrl->mem_head;
531 ctrl->mem_head = mem_node;
532 }
533
534 while (numpmem--) {
535 p_mem_node = kmalloc_obj(struct pci_resource);
536
537 if (!p_mem_node)
538 break;
539
540 p_mem_node->base = *(u32 *)p_byte;
541 dbg("pre-mem base = %8.8x\n", p_mem_node->base);
542 p_byte += 4;
543
544 if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) {
545 kfree(p_mem_node);
546 return 2;
547 }
548
549 p_mem_node->length = *(u32 *)p_byte;
550 dbg("pre-mem length = %8.8x\n", p_mem_node->length);
551 p_byte += 4;
552
553 if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) {
554 kfree(p_mem_node);
555 return 2;
556 }
557
558 p_mem_node->next = ctrl->p_mem_head;
559 ctrl->p_mem_head = p_mem_node;
560 }
561
562 while (numio--) {
563 io_node = kmalloc_obj(struct pci_resource);
564
565 if (!io_node)
566 break;
567
568 io_node->base = *(u32 *)p_byte;
569 dbg("io base = %8.8x\n", io_node->base);
570 p_byte += 4;
571
572 if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) {
573 kfree(io_node);
574 return 2;
575 }
576
577 io_node->length = *(u32 *)p_byte;
578 dbg("io length = %8.8x\n", io_node->length);
579 p_byte += 4;
580
581 if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) {
582 kfree(io_node);
583 return 2;
584 }
585
586 io_node->next = ctrl->io_head;
587 ctrl->io_head = io_node;
588 }
589
590 while (numbus--) {
591 bus_node = kmalloc_obj(struct pci_resource);
592
593 if (!bus_node)
594 break;
595
596 bus_node->base = *(u32 *)p_byte;
597 p_byte += 4;
598
599 if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) {
600 kfree(bus_node);
601 return 2;
602 }
603
604 bus_node->length = *(u32 *)p_byte;
605 p_byte += 4;
606
607 if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) {
608 kfree(bus_node);
609 return 2;
610 }
611
612 bus_node->next = ctrl->bus_head;
613 ctrl->bus_head = bus_node;
614 }
615
616 /* If all of the following fail, we don't have any resources for
617 * hot plug add
618 */
619 rc = 1;
620 rc &= cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
621 rc &= cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
622 rc &= cpqhp_resource_sort_and_combine(&(ctrl->io_head));
623 rc &= cpqhp_resource_sort_and_combine(&(ctrl->bus_head));
624
625 if (rc)
626 return(rc);
627 } else {
628 if ((evbuffer[0] != 0) && (!ctrl->push_flag))
629 return 1;
630 }
631
632 return 0;
633}
634
635
636int compaq_nvram_store(void __iomem *rom_start)
637{
638 int rc = 1;
639
640 if (rom_start == NULL)
641 return -ENODEV;
642
643 if (evbuffer_init) {
644 rc = store_HRT(rom_start);
645 if (rc)
646 err(msg_unable_to_save);
647 }
648 return rc;
649}
650