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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * IBM Hot Plug Controller Driver
4 *
5 * Written By: Irene Zubarev, IBM Corporation
6 *
7 * Copyright (C) 2001 Greg Kroah-Hartman ([email protected])
8 * Copyright (C) 2001,2002 IBM Corp.
9 *
10 * All rights reserved.
11 *
12 * Send feedback to <[email protected]>
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/pci.h>
19#include <linux/list.h>
20#include "ibmphp.h"
21
22
23static int configure_device(struct pci_func *);
24static int configure_bridge(struct pci_func **, u8);
25static struct res_needed *scan_behind_bridge(struct pci_func *, u8);
26static int add_new_bus(struct bus_node *, struct resource_node *, struct resource_node *, struct resource_node *, u8);
27static u8 find_sec_number(u8 primary_busno, u8 slotno);
28
29/*
30 * NOTE..... If BIOS doesn't provide default routing, we assign:
31 * 9 for SCSI, 10 for LAN adapters, and 11 for everything else.
32 * If adapter is bridged, then we assign 11 to it and devices behind it.
33 * We also assign the same irq numbers for multi function devices.
34 * These are PIC mode, so shouldn't matter n.e.ways (hopefully)
35 */
36static void assign_alt_irq(struct pci_func *cur_func, u8 class_code)
37{
38 int j;
39 for (j = 0; j < 4; j++) {
40 if (cur_func->irq[j] == 0xff) {
41 switch (class_code) {
42 case PCI_BASE_CLASS_STORAGE:
43 cur_func->irq[j] = SCSI_IRQ;
44 break;
45 case PCI_BASE_CLASS_NETWORK:
46 cur_func->irq[j] = LAN_IRQ;
47 break;
48 default:
49 cur_func->irq[j] = OTHER_IRQ;
50 break;
51 }
52 }
53 }
54}
55
56/*
57 * Configures the device to be added (will allocate needed resources if it
58 * can), the device can be a bridge or a regular pci device, can also be
59 * multi-functional
60 *
61 * Input: function to be added
62 *
63 * TO DO: The error case with Multifunction device or multi function bridge,
64 * if there is an error, will need to go through all previous functions and
65 * unconfigure....or can add some code into unconfigure_card....
66 */
67int ibmphp_configure_card(struct pci_func *func, u8 slotno)
68{
69 u16 vendor_id;
70 u32 class;
71 u8 class_code;
72 u8 hdr_type, device, sec_number;
73 u8 function;
74 struct pci_func *newfunc; /* for multi devices */
75 struct pci_func *cur_func, *prev_func;
76 int rc, i, j;
77 int cleanup_count;
78 u8 flag;
79 u8 valid_device = 0x00; /* to see if we are able to read from card any device info at all */
80
81 debug("inside configure_card, func->busno = %x\n", func->busno);
82
83 device = func->device;
84 cur_func = func;
85
86 /* We only get bus and device from IRQ routing table. So at this point,
87 * func->busno is correct, and func->device contains only device (at the 5
88 * highest bits)
89 */
90
91 /* For every function on the card */
92 for (function = 0x00; function < 0x08; function++) {
93 unsigned int devfn = PCI_DEVFN(device, function);
94 ibmphp_pci_bus->number = cur_func->busno;
95
96 cur_func->function = function;
97
98 debug("inside the loop, cur_func->busno = %x, cur_func->device = %x, cur_func->function = %x\n",
99 cur_func->busno, cur_func->device, cur_func->function);
100
101 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
102
103 debug("vendor_id is %x\n", vendor_id);
104 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
105 /* found correct device!!! */
106 debug("found valid device, vendor_id = %x\n", vendor_id);
107
108 ++valid_device;
109
110 /* header: x x x x x x x x
111 * | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge
112 * |_=> 0 = single function device, 1 = multi-function device
113 */
114
115 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
116 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
117
118 class_code = class >> 24;
119 debug("hrd_type = %x, class = %x, class_code %x\n", hdr_type, class, class_code);
120 class >>= 8; /* to take revision out, class = class.subclass.prog i/f */
121 if (class == PCI_CLASS_NOT_DEFINED_VGA) {
122 err("The device %x is VGA compatible and as is not supported for hot plugging. "
123 "Please choose another device.\n", cur_func->device);
124 return -ENODEV;
125 } else if (class == PCI_CLASS_DISPLAY_VGA) {
126 err("The device %x is not supported for hot plugging. Please choose another device.\n",
127 cur_func->device);
128 return -ENODEV;
129 }
130 switch (hdr_type) {
131 case PCI_HEADER_TYPE_NORMAL:
132 debug("single device case.... vendor id = %x, hdr_type = %x, class = %x\n", vendor_id, hdr_type, class);
133 assign_alt_irq(cur_func, class_code);
134 rc = configure_device(cur_func);
135 if (rc < 0) {
136 /* We need to do this in case some other BARs were properly inserted */
137 err("was not able to configure devfunc %x on bus %x.\n",
138 cur_func->device, cur_func->busno);
139 cleanup_count = 6;
140 goto error;
141 }
142 cur_func->next = NULL;
143 function = 0x8;
144 break;
145 case PCI_HEADER_TYPE_MULTIDEVICE:
146 assign_alt_irq(cur_func, class_code);
147 rc = configure_device(cur_func);
148 if (rc < 0) {
149 /* We need to do this in case some other BARs were properly inserted */
150 err("was not able to configure devfunc %x on bus %x...bailing out\n",
151 cur_func->device, cur_func->busno);
152 cleanup_count = 6;
153 goto error;
154 }
155 newfunc = kzalloc_obj(*newfunc);
156 if (!newfunc)
157 return -ENOMEM;
158
159 newfunc->busno = cur_func->busno;
160 newfunc->device = device;
161 cur_func->next = newfunc;
162 cur_func = newfunc;
163 for (j = 0; j < 4; j++)
164 newfunc->irq[j] = cur_func->irq[j];
165 break;
166 case PCI_HEADER_TYPE_MULTIBRIDGE:
167 class >>= 8;
168 if (class != PCI_CLASS_BRIDGE_PCI) {
169 err("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. Please insert another card.\n",
170 cur_func->device);
171 return -ENODEV;
172 }
173 assign_alt_irq(cur_func, class_code);
174 rc = configure_bridge(&cur_func, slotno);
175 if (rc == -ENODEV) {
176 err("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
177 err("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);
178 return rc;
179 }
180 if (rc) {
181 /* We need to do this in case some other BARs were properly inserted */
182 err("was not able to hot-add PPB properly.\n");
183 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
184 cleanup_count = 2;
185 goto error;
186 }
187
188 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
189 flag = 0;
190 for (i = 0; i < 32; i++) {
191 if (func->devices[i]) {
192 newfunc = kzalloc_obj(*newfunc);
193 if (!newfunc)
194 return -ENOMEM;
195
196 newfunc->busno = sec_number;
197 newfunc->device = (u8) i;
198 for (j = 0; j < 4; j++)
199 newfunc->irq[j] = cur_func->irq[j];
200
201 if (flag) {
202 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
203 prev_func->next = newfunc;
204 } else
205 cur_func->next = newfunc;
206
207 rc = ibmphp_configure_card(newfunc, slotno);
208 /* This could only happen if kmalloc failed */
209 if (rc) {
210 /* We need to do this in case bridge itself got configured properly, but devices behind it failed */
211 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
212 cleanup_count = 2;
213 goto error;
214 }
215 flag = 1;
216 }
217 }
218
219 newfunc = kzalloc_obj(*newfunc);
220 if (!newfunc)
221 return -ENOMEM;
222
223 newfunc->busno = cur_func->busno;
224 newfunc->device = device;
225 for (j = 0; j < 4; j++)
226 newfunc->irq[j] = cur_func->irq[j];
227 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next);
228 prev_func->next = newfunc;
229 cur_func = newfunc;
230 break;
231 case PCI_HEADER_TYPE_BRIDGE:
232 class >>= 8;
233 debug("class now is %x\n", class);
234 if (class != PCI_CLASS_BRIDGE_PCI) {
235 err("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. Please insert another card.\n",
236 cur_func->device);
237 return -ENODEV;
238 }
239
240 assign_alt_irq(cur_func, class_code);
241
242 debug("cur_func->busno b4 configure_bridge is %x\n", cur_func->busno);
243 rc = configure_bridge(&cur_func, slotno);
244 if (rc == -ENODEV) {
245 err("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
246 err("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);
247 return rc;
248 }
249 if (rc) {
250 /* We need to do this in case some other BARs were properly inserted */
251 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
252 err("was not able to hot-add PPB properly.\n");
253 cleanup_count = 2;
254 goto error;
255 }
256 debug("cur_func->busno = %x, device = %x, function = %x\n",
257 cur_func->busno, device, function);
258 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
259 debug("after configuring bridge..., sec_number = %x\n", sec_number);
260 flag = 0;
261 for (i = 0; i < 32; i++) {
262 if (func->devices[i]) {
263 debug("inside for loop, device is %x\n", i);
264 newfunc = kzalloc_obj(*newfunc);
265 if (!newfunc)
266 return -ENOMEM;
267
268 newfunc->busno = sec_number;
269 newfunc->device = (u8) i;
270 for (j = 0; j < 4; j++)
271 newfunc->irq[j] = cur_func->irq[j];
272
273 if (flag) {
274 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next);
275 prev_func->next = newfunc;
276 } else
277 cur_func->next = newfunc;
278
279 rc = ibmphp_configure_card(newfunc, slotno);
280
281 /* Again, this case should not happen... For complete paranoia, will need to call remove_bus */
282 if (rc) {
283 /* We need to do this in case some other BARs were properly inserted */
284 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
285 cleanup_count = 2;
286 goto error;
287 }
288 flag = 1;
289 }
290 }
291
292 function = 0x8;
293 break;
294 default:
295 err("MAJOR PROBLEM!!!!, header type not supported? %x\n", hdr_type);
296 return -ENXIO;
297 } /* end of switch */
298 } /* end of valid device */
299 } /* end of for */
300
301 if (!valid_device) {
302 err("Cannot find any valid devices on the card. Or unable to read from card.\n");
303 return -ENODEV;
304 }
305
306 return 0;
307
308error:
309 for (i = 0; i < cleanup_count; i++) {
310 if (cur_func->io[i]) {
311 ibmphp_remove_resource(cur_func->io[i]);
312 cur_func->io[i] = NULL;
313 } else if (cur_func->pfmem[i]) {
314 ibmphp_remove_resource(cur_func->pfmem[i]);
315 cur_func->pfmem[i] = NULL;
316 } else if (cur_func->mem[i]) {
317 ibmphp_remove_resource(cur_func->mem[i]);
318 cur_func->mem[i] = NULL;
319 }
320 }
321 return rc;
322}
323
324/*
325 * This function configures the pci BARs of a single device.
326 * Input: pointer to the pci_func
327 * Output: configured PCI, 0, or error
328 */
329static int configure_device(struct pci_func *func)
330{
331 u32 bar[6];
332 static const u32 address[] = {
333 PCI_BASE_ADDRESS_0,
334 PCI_BASE_ADDRESS_1,
335 PCI_BASE_ADDRESS_2,
336 PCI_BASE_ADDRESS_3,
337 PCI_BASE_ADDRESS_4,
338 PCI_BASE_ADDRESS_5,
339 0
340 };
341 u8 irq;
342 int count;
343 int len[6];
344 struct resource_node *io[6];
345 struct resource_node *mem[6];
346 struct resource_node *mem_tmp;
347 struct resource_node *pfmem[6];
348 unsigned int devfn;
349
350 debug("%s - inside\n", __func__);
351
352 devfn = PCI_DEVFN(func->device, func->function);
353 ibmphp_pci_bus->number = func->busno;
354
355 for (count = 0; address[count]; count++) { /* for 6 BARs */
356
357 /* not sure if i need this. per scott, said maybe need * something like this
358 if devices don't adhere 100% to the spec, so don't want to write
359 to the reserved bits
360
361 pcibios_read_config_byte(cur_func->busno, cur_func->device,
362 PCI_BASE_ADDRESS_0 + 4 * count, &tmp);
363 if (tmp & 0x01) // IO
364 pcibios_write_config_dword(cur_func->busno, cur_func->device,
365 PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFD);
366 else // Memory
367 pcibios_write_config_dword(cur_func->busno, cur_func->device,
368 PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFF);
369 */
370 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
371 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
372
373 if (!bar[count]) /* This BAR is not implemented */
374 continue;
375
376 debug("Device %x BAR %d wants %x\n", func->device, count, bar[count]);
377
378 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
379 /* This is IO */
380 debug("inside IO SPACE\n");
381
382 len[count] = bar[count] & 0xFFFFFFFC;
383 len[count] = ~len[count] + 1;
384
385 debug("len[count] in IO %x, count %d\n", len[count], count);
386
387 io[count] = kzalloc_obj(struct resource_node);
388
389 if (!io[count])
390 return -ENOMEM;
391
392 io[count]->type = IO;
393 io[count]->busno = func->busno;
394 io[count]->devfunc = PCI_DEVFN(func->device, func->function);
395 io[count]->len = len[count];
396 if (ibmphp_check_resource(io[count], 0) == 0) {
397 ibmphp_add_resource(io[count]);
398 func->io[count] = io[count];
399 } else {
400 err("cannot allocate requested io for bus %x device %x function %x len %x\n",
401 func->busno, func->device, func->function, len[count]);
402 kfree(io[count]);
403 return -EIO;
404 }
405 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
406
407 /* _______________This is for debugging purposes only_____________________ */
408 debug("b4 writing, the IO address is %x\n", func->io[count]->start);
409 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
410 debug("after writing.... the start address is %x\n", bar[count]);
411 /* _________________________________________________________________________*/
412
413 } else {
414 /* This is Memory */
415 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
416 /* pfmem */
417 debug("PFMEM SPACE\n");
418
419 len[count] = bar[count] & 0xFFFFFFF0;
420 len[count] = ~len[count] + 1;
421
422 debug("len[count] in PFMEM %x, count %d\n", len[count], count);
423
424 pfmem[count] = kzalloc_obj(struct resource_node);
425 if (!pfmem[count])
426 return -ENOMEM;
427
428 pfmem[count]->type = PFMEM;
429 pfmem[count]->busno = func->busno;
430 pfmem[count]->devfunc = PCI_DEVFN(func->device,
431 func->function);
432 pfmem[count]->len = len[count];
433 pfmem[count]->fromMem = 0;
434 if (ibmphp_check_resource(pfmem[count], 0) == 0) {
435 ibmphp_add_resource(pfmem[count]);
436 func->pfmem[count] = pfmem[count];
437 } else {
438 mem_tmp = kzalloc_obj(*mem_tmp);
439 if (!mem_tmp) {
440 kfree(pfmem[count]);
441 return -ENOMEM;
442 }
443 mem_tmp->type = MEM;
444 mem_tmp->busno = pfmem[count]->busno;
445 mem_tmp->devfunc = pfmem[count]->devfunc;
446 mem_tmp->len = pfmem[count]->len;
447 debug("there's no pfmem... going into mem.\n");
448 if (ibmphp_check_resource(mem_tmp, 0) == 0) {
449 ibmphp_add_resource(mem_tmp);
450 pfmem[count]->fromMem = 1;
451 pfmem[count]->rangeno = mem_tmp->rangeno;
452 pfmem[count]->start = mem_tmp->start;
453 pfmem[count]->end = mem_tmp->end;
454 ibmphp_add_pfmem_from_mem(pfmem[count]);
455 func->pfmem[count] = pfmem[count];
456 } else {
457 err("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
458 func->busno, func->device, len[count]);
459 kfree(mem_tmp);
460 kfree(pfmem[count]);
461 return -EIO;
462 }
463 }
464
465 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
466
467 /*_______________This is for debugging purposes only______________________________*/
468 debug("b4 writing, start address is %x\n", func->pfmem[count]->start);
469 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
470 debug("after writing, start address is %x\n", bar[count]);
471 /*_________________________________________________________________________________*/
472
473 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) { /* takes up another dword */
474 debug("inside the mem 64 case, count %d\n", count);
475 count += 1;
476 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
477 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
478 }
479 } else {
480 /* regular memory */
481 debug("REGULAR MEM SPACE\n");
482
483 len[count] = bar[count] & 0xFFFFFFF0;
484 len[count] = ~len[count] + 1;
485
486 debug("len[count] in Mem %x, count %d\n", len[count], count);
487
488 mem[count] = kzalloc_obj(struct resource_node);
489 if (!mem[count])
490 return -ENOMEM;
491
492 mem[count]->type = MEM;
493 mem[count]->busno = func->busno;
494 mem[count]->devfunc = PCI_DEVFN(func->device,
495 func->function);
496 mem[count]->len = len[count];
497 if (ibmphp_check_resource(mem[count], 0) == 0) {
498 ibmphp_add_resource(mem[count]);
499 func->mem[count] = mem[count];
500 } else {
501 err("cannot allocate requested mem for bus %x, device %x, len %x\n",
502 func->busno, func->device, len[count]);
503 kfree(mem[count]);
504 return -EIO;
505 }
506 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
507 /* _______________________This is for debugging purposes only _______________________*/
508 debug("b4 writing, start address is %x\n", func->mem[count]->start);
509 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
510 debug("after writing, the address is %x\n", bar[count]);
511 /* __________________________________________________________________________________*/
512
513 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
514 /* takes up another dword */
515 debug("inside mem 64 case, reg. mem, count %d\n", count);
516 count += 1;
517 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
518 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
519 }
520 }
521 } /* end of mem */
522 } /* end of for */
523
524 func->bus = 0; /* To indicate that this is not a PPB */
525 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
526 if ((irq > 0x00) && (irq < 0x05))
527 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
528
529 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
530 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
531
532 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_ROM_ADDRESS, 0x00L);
533 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
534
535 return 0;
536}
537
538/******************************************************************************
539 * This routine configures a PCI-2-PCI bridge and the functions behind it
540 * Parameters: pci_func
541 * Returns:
542 ******************************************************************************/
543static int configure_bridge(struct pci_func **func_passed, u8 slotno)
544{
545 int count;
546 int i;
547 int rc;
548 u8 sec_number;
549 u8 io_base;
550 u16 pfmem_base;
551 u32 bar[2];
552 u32 len[2];
553 u8 flag_io = 0;
554 u8 flag_mem = 0;
555 u8 flag_pfmem = 0;
556 u8 need_io_upper = 0;
557 u8 need_pfmem_upper = 0;
558 struct res_needed *amount_needed = NULL;
559 struct resource_node *io = NULL;
560 struct resource_node *bus_io[2] = {NULL, NULL};
561 struct resource_node *mem = NULL;
562 struct resource_node *bus_mem[2] = {NULL, NULL};
563 struct resource_node *mem_tmp = NULL;
564 struct resource_node *pfmem = NULL;
565 struct resource_node *bus_pfmem[2] = {NULL, NULL};
566 struct bus_node *bus;
567 static const u32 address[] = {
568 PCI_BASE_ADDRESS_0,
569 PCI_BASE_ADDRESS_1,
570 0
571 };
572 struct pci_func *func = *func_passed;
573 unsigned int devfn;
574 u8 irq;
575 int retval;
576
577 debug("%s - enter\n", __func__);
578
579 devfn = PCI_DEVFN(func->function, func->device);
580 ibmphp_pci_bus->number = func->busno;
581
582 /* Configuring necessary info for the bridge so that we could see the devices
583 * behind it
584 */
585
586 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, func->busno);
587
588 /* _____________________For debugging purposes only __________________________
589 pci_bus_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);
590 debug("primary # written into the bridge is %x\n", pri_number);
591 ___________________________________________________________________________*/
592
593 /* in EBDA, only get allocated 1 additional bus # per slot */
594 sec_number = find_sec_number(func->busno, slotno);
595 if (sec_number == 0xff) {
596 err("cannot allocate secondary bus number for the bridged device\n");
597 return -EINVAL;
598 }
599
600 debug("after find_sec_number, the number we got is %x\n", sec_number);
601 debug("AFTER FIND_SEC_NUMBER, func->busno IS %x\n", func->busno);
602
603 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, sec_number);
604
605 /* __________________For debugging purposes only __________________________________
606 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
607 debug("sec_number after write/read is %x\n", sec_number);
608 ________________________________________________________________________________*/
609
610 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, sec_number);
611
612 /* __________________For debugging purposes only ____________________________________
613 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sec_number);
614 debug("subordinate number after write/read is %x\n", sec_number);
615 __________________________________________________________________________________*/
616
617 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
618 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
619 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SEC_LATENCY_TIMER, LATENCY);
620
621 debug("func->busno is %x\n", func->busno);
622 debug("sec_number after writing is %x\n", sec_number);
623
624
625 /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
626 !!!!!!!!!!!!!!!NEED TO ADD!!! FAST BACK-TO-BACK ENABLE!!!!!!!!!!!!!!!!!!!!
627 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
628
629
630 /* First we need to allocate mem/io for the bridge itself in case it needs it */
631 for (count = 0; address[count]; count++) { /* for 2 BARs */
632 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
633 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
634
635 if (!bar[count]) {
636 /* This BAR is not implemented */
637 debug("so we come here then, eh?, count = %d\n", count);
638 continue;
639 }
640 // tmp_bar = bar[count];
641
642 debug("Bar %d wants %x\n", count, bar[count]);
643
644 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
645 /* This is IO */
646 len[count] = bar[count] & 0xFFFFFFFC;
647 len[count] = ~len[count] + 1;
648
649 debug("len[count] in IO = %x\n", len[count]);
650
651 bus_io[count] = kzalloc_obj(struct resource_node);
652
653 if (!bus_io[count]) {
654 retval = -ENOMEM;
655 goto error;
656 }
657 bus_io[count]->type = IO;
658 bus_io[count]->busno = func->busno;
659 bus_io[count]->devfunc = PCI_DEVFN(func->device,
660 func->function);
661 bus_io[count]->len = len[count];
662 if (ibmphp_check_resource(bus_io[count], 0) == 0) {
663 ibmphp_add_resource(bus_io[count]);
664 func->io[count] = bus_io[count];
665 } else {
666 err("cannot allocate requested io for bus %x, device %x, len %x\n",
667 func->busno, func->device, len[count]);
668 kfree(bus_io[count]);
669 return -EIO;
670 }
671
672 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
673
674 } else {
675 /* This is Memory */
676 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
677 /* pfmem */
678 len[count] = bar[count] & 0xFFFFFFF0;
679 len[count] = ~len[count] + 1;
680
681 debug("len[count] in PFMEM = %x\n", len[count]);
682
683 bus_pfmem[count] = kzalloc_obj(struct resource_node);
684 if (!bus_pfmem[count]) {
685 retval = -ENOMEM;
686 goto error;
687 }
688 bus_pfmem[count]->type = PFMEM;
689 bus_pfmem[count]->busno = func->busno;
690 bus_pfmem[count]->devfunc = PCI_DEVFN(func->device,
691 func->function);
692 bus_pfmem[count]->len = len[count];
693 bus_pfmem[count]->fromMem = 0;
694 if (ibmphp_check_resource(bus_pfmem[count], 0) == 0) {
695 ibmphp_add_resource(bus_pfmem[count]);
696 func->pfmem[count] = bus_pfmem[count];
697 } else {
698 mem_tmp = kzalloc_obj(*mem_tmp);
699 if (!mem_tmp) {
700 retval = -ENOMEM;
701 goto error;
702 }
703 mem_tmp->type = MEM;
704 mem_tmp->busno = bus_pfmem[count]->busno;
705 mem_tmp->devfunc = bus_pfmem[count]->devfunc;
706 mem_tmp->len = bus_pfmem[count]->len;
707 if (ibmphp_check_resource(mem_tmp, 0) == 0) {
708 ibmphp_add_resource(mem_tmp);
709 bus_pfmem[count]->fromMem = 1;
710 bus_pfmem[count]->rangeno = mem_tmp->rangeno;
711 ibmphp_add_pfmem_from_mem(bus_pfmem[count]);
712 func->pfmem[count] = bus_pfmem[count];
713 } else {
714 err("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
715 func->busno, func->device, len[count]);
716 kfree(mem_tmp);
717 kfree(bus_pfmem[count]);
718 return -EIO;
719 }
720 }
721
722 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
723
724 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
725 /* takes up another dword */
726 count += 1;
727 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
728 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
729
730 }
731 } else {
732 /* regular memory */
733 len[count] = bar[count] & 0xFFFFFFF0;
734 len[count] = ~len[count] + 1;
735
736 debug("len[count] in Memory is %x\n", len[count]);
737
738 bus_mem[count] = kzalloc_obj(struct resource_node);
739 if (!bus_mem[count]) {
740 retval = -ENOMEM;
741 goto error;
742 }
743 bus_mem[count]->type = MEM;
744 bus_mem[count]->busno = func->busno;
745 bus_mem[count]->devfunc = PCI_DEVFN(func->device,
746 func->function);
747 bus_mem[count]->len = len[count];
748 if (ibmphp_check_resource(bus_mem[count], 0) == 0) {
749 ibmphp_add_resource(bus_mem[count]);
750 func->mem[count] = bus_mem[count];
751 } else {
752 err("cannot allocate requested mem for bus %x, device %x, len %x\n",
753 func->busno, func->device, len[count]);
754 kfree(bus_mem[count]);
755 return -EIO;
756 }
757
758 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
759
760 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
761 /* takes up another dword */
762 count += 1;
763 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
764 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
765
766 }
767 }
768 } /* end of mem */
769 } /* end of for */
770
771 /* Now need to see how much space the devices behind the bridge needed */
772 amount_needed = scan_behind_bridge(func, sec_number);
773 if (amount_needed == NULL)
774 return -ENOMEM;
775
776 ibmphp_pci_bus->number = func->busno;
777 debug("after coming back from scan_behind_bridge\n");
778 debug("amount_needed->not_correct = %x\n", amount_needed->not_correct);
779 debug("amount_needed->io = %x\n", amount_needed->io);
780 debug("amount_needed->mem = %x\n", amount_needed->mem);
781 debug("amount_needed->pfmem = %x\n", amount_needed->pfmem);
782
783 if (amount_needed->not_correct) {
784 debug("amount_needed is not correct\n");
785 for (count = 0; address[count]; count++) {
786 /* for 2 BARs */
787 if (bus_io[count]) {
788 ibmphp_remove_resource(bus_io[count]);
789 func->io[count] = NULL;
790 } else if (bus_pfmem[count]) {
791 ibmphp_remove_resource(bus_pfmem[count]);
792 func->pfmem[count] = NULL;
793 } else if (bus_mem[count]) {
794 ibmphp_remove_resource(bus_mem[count]);
795 func->mem[count] = NULL;
796 }
797 }
798 kfree(amount_needed);
799 return -ENODEV;
800 }
801
802 if (!amount_needed->io) {
803 debug("it doesn't want IO?\n");
804 flag_io = 1;
805 } else {
806 debug("it wants %x IO behind the bridge\n", amount_needed->io);
807 io = kzalloc_obj(*io);
808
809 if (!io) {
810 retval = -ENOMEM;
811 goto error;
812 }
813 io->type = IO;
814 io->busno = func->busno;
815 io->devfunc = PCI_DEVFN(func->device, func->function);
816 io->len = amount_needed->io;
817 if (ibmphp_check_resource(io, 1) == 0) {
818 debug("were we able to add io\n");
819 ibmphp_add_resource(io);
820 flag_io = 1;
821 }
822 }
823
824 if (!amount_needed->mem) {
825 debug("it doesn't want n.e.memory?\n");
826 flag_mem = 1;
827 } else {
828 debug("it wants %x memory behind the bridge\n", amount_needed->mem);
829 mem = kzalloc_obj(*mem);
830 if (!mem) {
831 retval = -ENOMEM;
832 goto error;
833 }
834 mem->type = MEM;
835 mem->busno = func->busno;
836 mem->devfunc = PCI_DEVFN(func->device, func->function);
837 mem->len = amount_needed->mem;
838 if (ibmphp_check_resource(mem, 1) == 0) {
839 ibmphp_add_resource(mem);
840 flag_mem = 1;
841 debug("were we able to add mem\n");
842 }
843 }
844
845 if (!amount_needed->pfmem) {
846 debug("it doesn't want n.e.pfmem mem?\n");
847 flag_pfmem = 1;
848 } else {
849 debug("it wants %x pfmemory behind the bridge\n", amount_needed->pfmem);
850 pfmem = kzalloc_obj(*pfmem);
851 if (!pfmem) {
852 retval = -ENOMEM;
853 goto error;
854 }
855 pfmem->type = PFMEM;
856 pfmem->busno = func->busno;
857 pfmem->devfunc = PCI_DEVFN(func->device, func->function);
858 pfmem->len = amount_needed->pfmem;
859 pfmem->fromMem = 0;
860 if (ibmphp_check_resource(pfmem, 1) == 0) {
861 ibmphp_add_resource(pfmem);
862 flag_pfmem = 1;
863 } else {
864 mem_tmp = kzalloc_obj(*mem_tmp);
865 if (!mem_tmp) {
866 retval = -ENOMEM;
867 goto error;
868 }
869 mem_tmp->type = MEM;
870 mem_tmp->busno = pfmem->busno;
871 mem_tmp->devfunc = pfmem->devfunc;
872 mem_tmp->len = pfmem->len;
873 if (ibmphp_check_resource(mem_tmp, 1) == 0) {
874 ibmphp_add_resource(mem_tmp);
875 pfmem->fromMem = 1;
876 pfmem->rangeno = mem_tmp->rangeno;
877 ibmphp_add_pfmem_from_mem(pfmem);
878 flag_pfmem = 1;
879 }
880 }
881 }
882
883 debug("b4 if (flag_io && flag_mem && flag_pfmem)\n");
884 debug("flag_io = %x, flag_mem = %x, flag_pfmem = %x\n", flag_io, flag_mem, flag_pfmem);
885
886 if (flag_io && flag_mem && flag_pfmem) {
887 /* If on bootup, there was a bridged card in this slot,
888 * then card was removed and ibmphp got unloaded and loaded
889 * back again, there's no way for us to remove the bus
890 * struct, so no need to kmalloc, can use existing node
891 */
892 bus = ibmphp_find_res_bus(sec_number);
893 if (!bus) {
894 bus = kzalloc_obj(*bus);
895 if (!bus) {
896 retval = -ENOMEM;
897 goto error;
898 }
899 bus->busno = sec_number;
900 debug("b4 adding new bus\n");
901 rc = add_new_bus(bus, io, mem, pfmem, func->busno);
902 } else if (!(bus->rangeIO) && !(bus->rangeMem) && !(bus->rangePFMem))
903 rc = add_new_bus(bus, io, mem, pfmem, 0xFF);
904 else {
905 err("expected bus structure not empty?\n");
906 retval = -EIO;
907 goto error;
908 }
909 if (rc) {
910 if (rc == -ENOMEM) {
911 ibmphp_remove_bus(bus, func->busno);
912 kfree(amount_needed);
913 return rc;
914 }
915 retval = rc;
916 goto error;
917 }
918 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &io_base);
919 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &pfmem_base);
920
921 if ((io_base & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
922 debug("io 32\n");
923 need_io_upper = 1;
924 }
925 if ((pfmem_base & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
926 debug("pfmem 64\n");
927 need_pfmem_upper = 1;
928 }
929
930 if (bus->noIORanges) {
931 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00 | bus->rangeIO->start >> 8);
932 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00 | bus->rangeIO->end >> 8);
933
934 /* _______________This is for debugging purposes only ____________________
935 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &temp);
936 debug("io_base = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
937 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, &temp);
938 debug("io_limit = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
939 ________________________________________________________________________*/
940
941 if (need_io_upper) { /* since can't support n.e.ways */
942 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_BASE_UPPER16, 0x0000);
943 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, 0x0000);
944 }
945 } else {
946 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00);
947 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00);
948 }
949
950 if (bus->noMemRanges) {
951 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0x0000 | bus->rangeMem->start >> 16);
952 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000 | bus->rangeMem->end >> 16);
953
954 /* ____________________This is for debugging purposes only ________________________
955 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, &temp);
956 debug("mem_base = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
957 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, &temp);
958 debug("mem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
959 __________________________________________________________________________________*/
960
961 } else {
962 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0xffff);
963 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000);
964 }
965 if (bus->noPFMemRanges) {
966 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0x0000 | bus->rangePFMem->start >> 16);
967 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000 | bus->rangePFMem->end >> 16);
968
969 /* __________________________This is for debugging purposes only _______________________
970 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &temp);
971 debug("pfmem_base = %x", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
972 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &temp);
973 debug("pfmem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
974 ______________________________________________________________________________________*/
975
976 if (need_pfmem_upper) { /* since can't support n.e.ways */
977 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_BASE_UPPER32, 0x00000000);
978 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_LIMIT_UPPER32, 0x00000000);
979 }
980 } else {
981 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0xffff);
982 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000);
983 }
984
985 debug("b4 writing control information\n");
986
987 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
988 if ((irq > 0x00) && (irq < 0x05))
989 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
990 /*
991 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, ctrl);
992 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_PARITY);
993 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_SERR);
994 */
995
996 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
997 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, 0x07);
998 for (i = 0; i < 32; i++) {
999 if (amount_needed->devices[i]) {
1000 debug("device where devices[i] is 1 = %x\n", i);
1001 func->devices[i] = 1;
1002 }
1003 }
1004 func->bus = 1; /* For unconfiguring, to indicate it's PPB */
1005 func_passed = &func;
1006 debug("func->busno b4 returning is %x\n", func->busno);
1007 debug("func->busno b4 returning in the other structure is %x\n", (*func_passed)->busno);
1008 kfree(amount_needed);
1009 return 0;
1010 } else {
1011 err("Configuring bridge was unsuccessful...\n");
1012 mem_tmp = NULL;
1013 retval = -EIO;
1014 goto error;
1015 }
1016
1017error:
1018 kfree(amount_needed);
1019 if (pfmem)
1020 ibmphp_remove_resource(pfmem);
1021 if (io)
1022 ibmphp_remove_resource(io);
1023 if (mem)
1024 ibmphp_remove_resource(mem);
1025 for (i = 0; i < 2; i++) { /* for 2 BARs */
1026 if (bus_io[i]) {
1027 ibmphp_remove_resource(bus_io[i]);
1028 func->io[i] = NULL;
1029 } else if (bus_pfmem[i]) {
1030 ibmphp_remove_resource(bus_pfmem[i]);
1031 func->pfmem[i] = NULL;
1032 } else if (bus_mem[i]) {
1033 ibmphp_remove_resource(bus_mem[i]);
1034 func->mem[i] = NULL;
1035 }
1036 }
1037 return retval;
1038}
1039
1040/*****************************************************************************
1041 * This function adds up the amount of resources needed behind the PPB bridge
1042 * and passes it to the configure_bridge function
1043 * Input: bridge function
1044 * Output: amount of resources needed
1045 *****************************************************************************/
1046static struct res_needed *scan_behind_bridge(struct pci_func *func, u8 busno)
1047{
1048 int count, len[6];
1049 u16 vendor_id;
1050 u8 hdr_type;
1051 u8 device, function;
1052 unsigned int devfn;
1053 int howmany = 0; /*this is to see if there are any devices behind the bridge */
1054
1055 u32 bar[6], class;
1056 static const u32 address[] = {
1057 PCI_BASE_ADDRESS_0,
1058 PCI_BASE_ADDRESS_1,
1059 PCI_BASE_ADDRESS_2,
1060 PCI_BASE_ADDRESS_3,
1061 PCI_BASE_ADDRESS_4,
1062 PCI_BASE_ADDRESS_5,
1063 0
1064 };
1065 struct res_needed *amount;
1066
1067 amount = kzalloc_obj(*amount);
1068 if (amount == NULL)
1069 return NULL;
1070
1071 ibmphp_pci_bus->number = busno;
1072
1073 debug("the bus_no behind the bridge is %x\n", busno);
1074 debug("scanning devices behind the bridge...\n");
1075 for (device = 0; device < 32; device++) {
1076 amount->devices[device] = 0;
1077 for (function = 0; function < 8; function++) {
1078 devfn = PCI_DEVFN(device, function);
1079
1080 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
1081
1082 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
1083 /* found correct device!!! */
1084 howmany++;
1085
1086 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
1087 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
1088
1089 debug("hdr_type behind the bridge is %x\n", hdr_type);
1090 if ((hdr_type & PCI_HEADER_TYPE_MASK) == PCI_HEADER_TYPE_BRIDGE) {
1091 err("embedded bridges not supported for hot-plugging.\n");
1092 amount->not_correct = 1;
1093 return amount;
1094 }
1095
1096 class >>= 8; /* to take revision out, class = class.subclass.prog i/f */
1097 if (class == PCI_CLASS_NOT_DEFINED_VGA) {
1098 err("The device %x is VGA compatible and as is not supported for hot plugging. Please choose another device.\n", device);
1099 amount->not_correct = 1;
1100 return amount;
1101 } else if (class == PCI_CLASS_DISPLAY_VGA) {
1102 err("The device %x is not supported for hot plugging. Please choose another device.\n", device);
1103 amount->not_correct = 1;
1104 return amount;
1105 }
1106
1107 amount->devices[device] = 1;
1108
1109 for (count = 0; address[count]; count++) {
1110 /* for 6 BARs */
1111 /*
1112 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, address[count], &tmp);
1113 if (tmp & 0x01) // IO
1114 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFD);
1115 else // MEMORY
1116 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
1117 */
1118 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
1119 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
1120
1121 debug("what is bar[count]? %x, count = %d\n", bar[count], count);
1122
1123 if (!bar[count]) /* This BAR is not implemented */
1124 continue;
1125
1126 //tmp_bar = bar[count];
1127
1128 debug("count %d device %x function %x wants %x resources\n", count, device, function, bar[count]);
1129
1130 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
1131 /* This is IO */
1132 len[count] = bar[count] & 0xFFFFFFFC;
1133 len[count] = ~len[count] + 1;
1134 amount->io += len[count];
1135 } else {
1136 /* This is Memory */
1137 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
1138 /* pfmem */
1139 len[count] = bar[count] & 0xFFFFFFF0;
1140 len[count] = ~len[count] + 1;
1141 amount->pfmem += len[count];
1142 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64)
1143 /* takes up another dword */
1144 count += 1;
1145
1146 } else {
1147 /* regular memory */
1148 len[count] = bar[count] & 0xFFFFFFF0;
1149 len[count] = ~len[count] + 1;
1150 amount->mem += len[count];
1151 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
1152 /* takes up another dword */
1153 count += 1;
1154 }
1155 }
1156 }
1157 } /* end for */
1158 } /* end if (valid) */
1159 } /* end for */
1160 } /* end for */
1161
1162 if (!howmany)
1163 amount->not_correct = 1;
1164 else
1165 amount->not_correct = 0;
1166 if ((amount->io) && (amount->io < IOBRIDGE))
1167 amount->io = IOBRIDGE;
1168 if ((amount->mem) && (amount->mem < MEMBRIDGE))
1169 amount->mem = MEMBRIDGE;
1170 if ((amount->pfmem) && (amount->pfmem < MEMBRIDGE))
1171 amount->pfmem = MEMBRIDGE;
1172 return amount;
1173}
1174
1175/* The following 3 unconfigure_boot_ routines deal with the case when we had the card
1176 * upon bootup in the system, since we don't allocate func to such case, we need to read
1177 * the start addresses from pci config space and then find the corresponding entries in
1178 * our resource lists. The functions return either 0, -ENODEV, or -1 (general failure)
1179 * Change: we also call these functions even if we configured the card ourselves (i.e., not
1180 * the bootup case), since it should work same way
1181 */
1182static int unconfigure_boot_device(u8 busno, u8 device, u8 function)
1183{
1184 u32 start_address;
1185 static const u32 address[] = {
1186 PCI_BASE_ADDRESS_0,
1187 PCI_BASE_ADDRESS_1,
1188 PCI_BASE_ADDRESS_2,
1189 PCI_BASE_ADDRESS_3,
1190 PCI_BASE_ADDRESS_4,
1191 PCI_BASE_ADDRESS_5,
1192 0
1193 };
1194 int count;
1195 struct resource_node *io;
1196 struct resource_node *mem;
1197 struct resource_node *pfmem;
1198 struct bus_node *bus;
1199 u32 end_address;
1200 u32 temp_end;
1201 u32 size;
1202 u32 tmp_address;
1203 unsigned int devfn;
1204
1205 debug("%s - enter\n", __func__);
1206
1207 bus = ibmphp_find_res_bus(busno);
1208 if (!bus) {
1209 debug("cannot find corresponding bus.\n");
1210 return -EINVAL;
1211 }
1212
1213 devfn = PCI_DEVFN(device, function);
1214 ibmphp_pci_bus->number = busno;
1215 for (count = 0; address[count]; count++) { /* for 6 BARs */
1216 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address);
1217
1218 /* We can do this here, b/c by that time the device driver of the card has been stopped */
1219
1220 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
1221 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &size);
1222 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], start_address);
1223
1224 debug("start_address is %x\n", start_address);
1225 debug("busno, device, function %x %x %x\n", busno, device, function);
1226 if (!size) {
1227 /* This BAR is not implemented */
1228 debug("is this bar no implemented?, count = %d\n", count);
1229 continue;
1230 }
1231 tmp_address = start_address;
1232 if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
1233 /* This is IO */
1234 start_address &= PCI_BASE_ADDRESS_IO_MASK;
1235 size = size & 0xFFFFFFFC;
1236 size = ~size + 1;
1237 end_address = start_address + size - 1;
1238 if (ibmphp_find_resource(bus, start_address, &io, IO))
1239 goto report_search_failure;
1240
1241 debug("io->start = %x\n", io->start);
1242 temp_end = io->end;
1243 start_address = io->end + 1;
1244 ibmphp_remove_resource(io);
1245 /* This is needed b/c of the old I/O restrictions in the BIOS */
1246 while (temp_end < end_address) {
1247 if (ibmphp_find_resource(bus, start_address,
1248 &io, IO))
1249 goto report_search_failure;
1250
1251 debug("io->start = %x\n", io->start);
1252 temp_end = io->end;
1253 start_address = io->end + 1;
1254 ibmphp_remove_resource(io);
1255 }
1256
1257 /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
1258 } else {
1259 /* This is Memory */
1260 if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
1261 /* pfmem */
1262 debug("start address of pfmem is %x\n", start_address);
1263 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1264
1265 if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) {
1266 err("cannot find corresponding PFMEM resource to remove\n");
1267 return -EIO;
1268 }
1269 if (pfmem) {
1270 debug("pfmem->start = %x\n", pfmem->start);
1271
1272 ibmphp_remove_resource(pfmem);
1273 }
1274 } else {
1275 /* regular memory */
1276 debug("start address of mem is %x\n", start_address);
1277 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1278
1279 if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) {
1280 err("cannot find corresponding MEM resource to remove\n");
1281 return -EIO;
1282 }
1283 if (mem) {
1284 debug("mem->start = %x\n", mem->start);
1285
1286 ibmphp_remove_resource(mem);
1287 }
1288 }
1289 if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
1290 /* takes up another dword */
1291 count += 1;
1292 }
1293 } /* end of mem */
1294 } /* end of for */
1295
1296 return 0;
1297
1298report_search_failure:
1299 err("cannot find corresponding IO resource to remove\n");
1300 return -EIO;
1301}
1302
1303static int unconfigure_boot_bridge(u8 busno, u8 device, u8 function)
1304{
1305 int count;
1306 int bus_no, pri_no, sub_no, sec_no = 0;
1307 u32 start_address, tmp_address;
1308 u8 sec_number, sub_number, pri_number;
1309 struct resource_node *io = NULL;
1310 struct resource_node *mem = NULL;
1311 struct resource_node *pfmem = NULL;
1312 struct bus_node *bus;
1313 static const u32 address[] = {
1314 PCI_BASE_ADDRESS_0,
1315 PCI_BASE_ADDRESS_1,
1316 0
1317 };
1318 unsigned int devfn;
1319
1320 devfn = PCI_DEVFN(device, function);
1321 ibmphp_pci_bus->number = busno;
1322 bus_no = (int) busno;
1323 debug("busno is %x\n", busno);
1324 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);
1325 debug("%s - busno = %x, primary_number = %x\n", __func__, busno, pri_number);
1326
1327 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
1328 debug("sec_number is %x\n", sec_number);
1329 sec_no = (int) sec_number;
1330 pri_no = (int) pri_number;
1331 if (pri_no != bus_no) {
1332 err("primary numbers in our structures and pci config space don't match.\n");
1333 return -EINVAL;
1334 }
1335
1336 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sub_number);
1337 sub_no = (int) sub_number;
1338 debug("sub_no is %d, sec_no is %d\n", sub_no, sec_no);
1339 if (sec_no != sub_number) {
1340 err("there're more buses behind this bridge. Hot removal is not supported. Please choose another card\n");
1341 return -ENODEV;
1342 }
1343
1344 bus = ibmphp_find_res_bus(sec_number);
1345 if (!bus) {
1346 err("cannot find Bus structure for the bridged device\n");
1347 return -EINVAL;
1348 }
1349 debug("bus->busno is %x\n", bus->busno);
1350 debug("sec_number is %x\n", sec_number);
1351
1352 ibmphp_remove_bus(bus, busno);
1353
1354 for (count = 0; address[count]; count++) {
1355 /* for 2 BARs */
1356 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address);
1357
1358 if (!start_address) {
1359 /* This BAR is not implemented */
1360 continue;
1361 }
1362
1363 tmp_address = start_address;
1364
1365 if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
1366 /* This is IO */
1367 start_address &= PCI_BASE_ADDRESS_IO_MASK;
1368 if (ibmphp_find_resource(bus, start_address, &io, IO) < 0) {
1369 err("cannot find corresponding IO resource to remove\n");
1370 return -EIO;
1371 }
1372 if (io)
1373 debug("io->start = %x\n", io->start);
1374
1375 ibmphp_remove_resource(io);
1376
1377 /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
1378 } else {
1379 /* This is Memory */
1380 if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
1381 /* pfmem */
1382 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1383 if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) {
1384 err("cannot find corresponding PFMEM resource to remove\n");
1385 return -EINVAL;
1386 }
1387 if (pfmem) {
1388 debug("pfmem->start = %x\n", pfmem->start);
1389
1390 ibmphp_remove_resource(pfmem);
1391 }
1392 } else {
1393 /* regular memory */
1394 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1395 if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) {
1396 err("cannot find corresponding MEM resource to remove\n");
1397 return -EINVAL;
1398 }
1399 if (mem) {
1400 debug("mem->start = %x\n", mem->start);
1401
1402 ibmphp_remove_resource(mem);
1403 }
1404 }
1405 if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
1406 /* takes up another dword */
1407 count += 1;
1408 }
1409 } /* end of mem */
1410 } /* end of for */
1411 debug("%s - exiting, returning success\n", __func__);
1412 return 0;
1413}
1414
1415static int unconfigure_boot_card(struct slot *slot_cur)
1416{
1417 u16 vendor_id;
1418 u32 class;
1419 u8 hdr_type;
1420 u8 device;
1421 u8 busno;
1422 u8 function;
1423 int rc;
1424 unsigned int devfn;
1425 u8 valid_device = 0x00; /* To see if we are ever able to find valid device and read it */
1426
1427 debug("%s - enter\n", __func__);
1428
1429 device = slot_cur->device;
1430 busno = slot_cur->bus;
1431
1432 debug("b4 for loop, device is %x\n", device);
1433 /* For every function on the card */
1434 for (function = 0x0; function < 0x08; function++) {
1435 devfn = PCI_DEVFN(device, function);
1436 ibmphp_pci_bus->number = busno;
1437
1438 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
1439
1440 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
1441 /* found correct device!!! */
1442 ++valid_device;
1443
1444 debug("%s - found correct device\n", __func__);
1445
1446 /* header: x x x x x x x x
1447 * | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge
1448 * |_=> 0 = single function device, 1 = multi-function device
1449 */
1450
1451 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
1452 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
1453
1454 debug("hdr_type %x, class %x\n", hdr_type, class);
1455 class >>= 8; /* to take revision out, class = class.subclass.prog i/f */
1456 if (class == PCI_CLASS_NOT_DEFINED_VGA) {
1457 err("The device %x function %x is VGA compatible and is not supported for hot removing. Please choose another device.\n", device, function);
1458 return -ENODEV;
1459 } else if (class == PCI_CLASS_DISPLAY_VGA) {
1460 err("The device %x function %x is not supported for hot removing. Please choose another device.\n", device, function);
1461 return -ENODEV;
1462 }
1463
1464 switch (hdr_type) {
1465 case PCI_HEADER_TYPE_NORMAL:
1466 rc = unconfigure_boot_device(busno, device, function);
1467 if (rc) {
1468 err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
1469 device, function, busno);
1470 return rc;
1471 }
1472 function = 0x8;
1473 break;
1474 case PCI_HEADER_TYPE_MULTIDEVICE:
1475 rc = unconfigure_boot_device(busno, device, function);
1476 if (rc) {
1477 err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
1478 device, function, busno);
1479 return rc;
1480 }
1481 break;
1482 case PCI_HEADER_TYPE_BRIDGE:
1483 class >>= 8;
1484 if (class != PCI_CLASS_BRIDGE_PCI) {
1485 err("This device %x function %x is not PCI-to-PCI bridge, and is not supported for hot-removing. Please try another card.\n", device, function);
1486 return -ENODEV;
1487 }
1488 rc = unconfigure_boot_bridge(busno, device, function);
1489 if (rc != 0) {
1490 err("was not able to hot-remove PPB properly.\n");
1491 return rc;
1492 }
1493
1494 function = 0x8;
1495 break;
1496 case PCI_HEADER_TYPE_MULTIBRIDGE:
1497 class >>= 8;
1498 if (class != PCI_CLASS_BRIDGE_PCI) {
1499 err("This device %x function %x is not PCI-to-PCI bridge, and is not supported for hot-removing. Please try another card.\n", device, function);
1500 return -ENODEV;
1501 }
1502 rc = unconfigure_boot_bridge(busno, device, function);
1503 if (rc != 0) {
1504 err("was not able to hot-remove PPB properly.\n");
1505 return rc;
1506 }
1507 break;
1508 default:
1509 err("MAJOR PROBLEM!!!! Cannot read device's header\n");
1510 return -1;
1511 } /* end of switch */
1512 } /* end of valid device */
1513 } /* end of for */
1514
1515 if (!valid_device) {
1516 err("Could not find device to unconfigure. Or could not read the card.\n");
1517 return -1;
1518 }
1519 return 0;
1520}
1521
1522/*
1523 * free the resources of the card (multi, single, or bridged)
1524 * Parameters: slot, flag to say if this is for removing entire module or just
1525 * unconfiguring the device
1526 * TO DO: will probably need to add some code in case there was some resource,
1527 * to remove it... this is from when we have errors in the configure_card...
1528 * !!!!!!!!!!!!!!!!!!!!!!!!!FOR BUSES!!!!!!!!!!!!
1529 * Returns: 0, -1, -ENODEV
1530 */
1531int ibmphp_unconfigure_card(struct slot **slot_cur, int the_end)
1532{
1533 int i;
1534 int count;
1535 int rc;
1536 struct slot *sl = *slot_cur;
1537 struct pci_func *cur_func = NULL;
1538 struct pci_func *temp_func;
1539
1540 debug("%s - enter\n", __func__);
1541
1542 if (!the_end) {
1543 /* Need to unconfigure the card */
1544 rc = unconfigure_boot_card(sl);
1545 if ((rc == -ENODEV) || (rc == -EIO) || (rc == -EINVAL)) {
1546 /* In all other cases, will still need to get rid of func structure if it exists */
1547 return rc;
1548 }
1549 }
1550
1551 if (sl->func) {
1552 cur_func = sl->func;
1553 while (cur_func) {
1554 /* TO DO: WILL MOST LIKELY NEED TO GET RID OF THE BUS STRUCTURE FROM RESOURCES AS WELL */
1555 if (cur_func->bus) {
1556 /* in other words, it's a PPB */
1557 count = 2;
1558 } else {
1559 count = 6;
1560 }
1561
1562 for (i = 0; i < count; i++) {
1563 if (cur_func->io[i]) {
1564 debug("io[%d] exists\n", i);
1565 if (the_end > 0)
1566 ibmphp_remove_resource(cur_func->io[i]);
1567 cur_func->io[i] = NULL;
1568 }
1569 if (cur_func->mem[i]) {
1570 debug("mem[%d] exists\n", i);
1571 if (the_end > 0)
1572 ibmphp_remove_resource(cur_func->mem[i]);
1573 cur_func->mem[i] = NULL;
1574 }
1575 if (cur_func->pfmem[i]) {
1576 debug("pfmem[%d] exists\n", i);
1577 if (the_end > 0)
1578 ibmphp_remove_resource(cur_func->pfmem[i]);
1579 cur_func->pfmem[i] = NULL;
1580 }
1581 }
1582
1583 temp_func = cur_func->next;
1584 kfree(cur_func);
1585 cur_func = temp_func;
1586 }
1587 }
1588
1589 sl->func = NULL;
1590 *slot_cur = sl;
1591 debug("%s - exit\n", __func__);
1592 return 0;
1593}
1594
1595/*
1596 * add a new bus resulting from hot-plugging a PPB bridge with devices
1597 *
1598 * Input: bus and the amount of resources needed (we know we can assign those,
1599 * since they've been checked already
1600 * Output: bus added to the correct spot
1601 * 0, -1, error
1602 */
1603static int add_new_bus(struct bus_node *bus, struct resource_node *io, struct resource_node *mem, struct resource_node *pfmem, u8 parent_busno)
1604{
1605 struct range_node *io_range = NULL;
1606 struct range_node *mem_range = NULL;
1607 struct range_node *pfmem_range = NULL;
1608 struct bus_node *cur_bus = NULL;
1609
1610 /* Trying to find the parent bus number */
1611 if (parent_busno != 0xFF) {
1612 cur_bus = ibmphp_find_res_bus(parent_busno);
1613 if (!cur_bus) {
1614 err("strange, cannot find bus which is supposed to be at the system... something is terribly wrong...\n");
1615 return -ENODEV;
1616 }
1617
1618 list_add(&bus->bus_list, &cur_bus->bus_list);
1619 }
1620 if (io) {
1621 io_range = kzalloc_obj(*io_range);
1622 if (!io_range)
1623 return -ENOMEM;
1624
1625 io_range->start = io->start;
1626 io_range->end = io->end;
1627 io_range->rangeno = 1;
1628 bus->noIORanges = 1;
1629 bus->rangeIO = io_range;
1630 }
1631 if (mem) {
1632 mem_range = kzalloc_obj(*mem_range);
1633 if (!mem_range)
1634 return -ENOMEM;
1635
1636 mem_range->start = mem->start;
1637 mem_range->end = mem->end;
1638 mem_range->rangeno = 1;
1639 bus->noMemRanges = 1;
1640 bus->rangeMem = mem_range;
1641 }
1642 if (pfmem) {
1643 pfmem_range = kzalloc_obj(*pfmem_range);
1644 if (!pfmem_range)
1645 return -ENOMEM;
1646
1647 pfmem_range->start = pfmem->start;
1648 pfmem_range->end = pfmem->end;
1649 pfmem_range->rangeno = 1;
1650 bus->noPFMemRanges = 1;
1651 bus->rangePFMem = pfmem_range;
1652 }
1653 return 0;
1654}
1655
1656/*
1657 * find the 1st available bus number for PPB to set as its secondary bus
1658 * Parameters: bus_number of the primary bus
1659 * Returns: bus_number of the secondary bus or 0xff in case of failure
1660 */
1661static u8 find_sec_number(u8 primary_busno, u8 slotno)
1662{
1663 int min, max;
1664 u8 busno;
1665 struct bus_info *bus;
1666 struct bus_node *bus_cur;
1667
1668 bus = ibmphp_find_same_bus_num(primary_busno);
1669 if (!bus) {
1670 err("cannot get slot range of the bus from the BIOS\n");
1671 return 0xff;
1672 }
1673 max = bus->slot_max;
1674 min = bus->slot_min;
1675 if ((slotno > max) || (slotno < min)) {
1676 err("got the wrong range\n");
1677 return 0xff;
1678 }
1679 busno = (u8) (slotno - (u8) min);
1680 busno += primary_busno + 0x01;
1681 bus_cur = ibmphp_find_res_bus(busno);
1682 /* either there is no such bus number, or there are no ranges, which
1683 * can only happen if we removed the bridged device in previous load
1684 * of the driver, and now only have the skeleton bus struct
1685 */
1686 if ((!bus_cur) || (!(bus_cur->rangeIO) && !(bus_cur->rangeMem) && !(bus_cur->rangePFMem)))
1687 return busno;
1688 return 0xff;
1689}