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 (greg@kroah.com)
8 * Copyright (C) 2001,2002 IBM Corp.
9 *
10 * All rights reserved.
11 *
12 * Send feedback to <gregkh@us.ibm.com>
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
23 static int configure_device(struct pci_func *);
24 static int configure_bridge(struct pci_func **, u8);
25 static struct res_needed *scan_behind_bridge(struct pci_func *, u8);
26 static int add_new_bus(struct bus_node *, struct resource_node *, struct resource_node *, struct resource_node *, u8);
27 static 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 */
36 static 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 */
67 int 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(sizeof(*newfunc), GFP_KERNEL);
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(sizeof(*newfunc), GFP_KERNEL);
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(sizeof(*newfunc), GFP_KERNEL);
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(sizeof(*newfunc), GFP_KERNEL);
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 break;
298 } /* end of switch */
299 } /* end of valid device */
300 } /* end of for */
301
302 if (!valid_device) {
303 err("Cannot find any valid devices on the card. Or unable to read from card.\n");
304 return -ENODEV;
305 }
306
307 return 0;
308
309 error:
310 for (i = 0; i < cleanup_count; i++) {
311 if (cur_func->io[i]) {
312 ibmphp_remove_resource(cur_func->io[i]);
313 cur_func->io[i] = NULL;
314 } else if (cur_func->pfmem[i]) {
315 ibmphp_remove_resource(cur_func->pfmem[i]);
316 cur_func->pfmem[i] = NULL;
317 } else if (cur_func->mem[i]) {
318 ibmphp_remove_resource(cur_func->mem[i]);
319 cur_func->mem[i] = NULL;
320 }
321 }
322 return rc;
323 }
324
325 /*
326 * This function configures the pci BARs of a single device.
327 * Input: pointer to the pci_func
328 * Output: configured PCI, 0, or error
329 */
330 static int configure_device(struct pci_func *func)
331 {
332 u32 bar[6];
333 u32 address[] = {
334 PCI_BASE_ADDRESS_0,
335 PCI_BASE_ADDRESS_1,
336 PCI_BASE_ADDRESS_2,
337 PCI_BASE_ADDRESS_3,
338 PCI_BASE_ADDRESS_4,
339 PCI_BASE_ADDRESS_5,
340 0
341 };
342 u8 irq;
343 int count;
344 int len[6];
345 struct resource_node *io[6];
346 struct resource_node *mem[6];
347 struct resource_node *mem_tmp;
348 struct resource_node *pfmem[6];
349 unsigned int devfn;
350
351 debug("%s - inside\n", __func__);
352
353 devfn = PCI_DEVFN(func->device, func->function);
354 ibmphp_pci_bus->number = func->busno;
355
356 for (count = 0; address[count]; count++) { /* for 6 BARs */
357
358 /* not sure if i need this. per scott, said maybe need * something like this
359 if devices don't adhere 100% to the spec, so don't want to write
360 to the reserved bits
361
362 pcibios_read_config_byte(cur_func->busno, cur_func->device,
363 PCI_BASE_ADDRESS_0 + 4 * count, &tmp);
364 if (tmp & 0x01) // IO
365 pcibios_write_config_dword(cur_func->busno, cur_func->device,
366 PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFD);
367 else // Memory
368 pcibios_write_config_dword(cur_func->busno, cur_func->device,
369 PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFF);
370 */
371 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
372 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
373
374 if (!bar[count]) /* This BAR is not implemented */
375 continue;
376
377 debug("Device %x BAR %d wants %x\n", func->device, count, bar[count]);
378
379 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
380 /* This is IO */
381 debug("inside IO SPACE\n");
382
383 len[count] = bar[count] & 0xFFFFFFFC;
384 len[count] = ~len[count] + 1;
385
386 debug("len[count] in IO %x, count %d\n", len[count], count);
387
388 io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
389
390 if (!io[count])
391 return -ENOMEM;
392
393 io[count]->type = IO;
394 io[count]->busno = func->busno;
395 io[count]->devfunc = PCI_DEVFN(func->device, func->function);
396 io[count]->len = len[count];
397 if (ibmphp_check_resource(io[count], 0) == 0) {
398 ibmphp_add_resource(io[count]);
399 func->io[count] = io[count];
400 } else {
401 err("cannot allocate requested io for bus %x device %x function %x len %x\n",
402 func->busno, func->device, func->function, len[count]);
403 kfree(io[count]);
404 return -EIO;
405 }
406 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
407
408 /* _______________This is for debugging purposes only_____________________ */
409 debug("b4 writing, the IO address is %x\n", func->io[count]->start);
410 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
411 debug("after writing.... the start address is %x\n", bar[count]);
412 /* _________________________________________________________________________*/
413
414 } else {
415 /* This is Memory */
416 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
417 /* pfmem */
418 debug("PFMEM SPACE\n");
419
420 len[count] = bar[count] & 0xFFFFFFF0;
421 len[count] = ~len[count] + 1;
422
423 debug("len[count] in PFMEM %x, count %d\n", len[count], count);
424
425 pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
426 if (!pfmem[count])
427 return -ENOMEM;
428
429 pfmem[count]->type = PFMEM;
430 pfmem[count]->busno = func->busno;
431 pfmem[count]->devfunc = PCI_DEVFN(func->device,
432 func->function);
433 pfmem[count]->len = len[count];
434 pfmem[count]->fromMem = 0;
435 if (ibmphp_check_resource(pfmem[count], 0) == 0) {
436 ibmphp_add_resource(pfmem[count]);
437 func->pfmem[count] = pfmem[count];
438 } else {
439 mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
440 if (!mem_tmp) {
441 kfree(pfmem[count]);
442 return -ENOMEM;
443 }
444 mem_tmp->type = MEM;
445 mem_tmp->busno = pfmem[count]->busno;
446 mem_tmp->devfunc = pfmem[count]->devfunc;
447 mem_tmp->len = pfmem[count]->len;
448 debug("there's no pfmem... going into mem.\n");
449 if (ibmphp_check_resource(mem_tmp, 0) == 0) {
450 ibmphp_add_resource(mem_tmp);
451 pfmem[count]->fromMem = 1;
452 pfmem[count]->rangeno = mem_tmp->rangeno;
453 pfmem[count]->start = mem_tmp->start;
454 pfmem[count]->end = mem_tmp->end;
455 ibmphp_add_pfmem_from_mem(pfmem[count]);
456 func->pfmem[count] = pfmem[count];
457 } else {
458 err("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
459 func->busno, func->device, len[count]);
460 kfree(mem_tmp);
461 kfree(pfmem[count]);
462 return -EIO;
463 }
464 }
465
466 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
467
468 /*_______________This is for debugging purposes only______________________________*/
469 debug("b4 writing, start address is %x\n", func->pfmem[count]->start);
470 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
471 debug("after writing, start address is %x\n", bar[count]);
472 /*_________________________________________________________________________________*/
473
474 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) { /* takes up another dword */
475 debug("inside the mem 64 case, count %d\n", count);
476 count += 1;
477 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
478 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
479 }
480 } else {
481 /* regular memory */
482 debug("REGULAR MEM SPACE\n");
483
484 len[count] = bar[count] & 0xFFFFFFF0;
485 len[count] = ~len[count] + 1;
486
487 debug("len[count] in Mem %x, count %d\n", len[count], count);
488
489 mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
490 if (!mem[count])
491 return -ENOMEM;
492
493 mem[count]->type = MEM;
494 mem[count]->busno = func->busno;
495 mem[count]->devfunc = PCI_DEVFN(func->device,
496 func->function);
497 mem[count]->len = len[count];
498 if (ibmphp_check_resource(mem[count], 0) == 0) {
499 ibmphp_add_resource(mem[count]);
500 func->mem[count] = mem[count];
501 } else {
502 err("cannot allocate requested mem for bus %x, device %x, len %x\n",
503 func->busno, func->device, len[count]);
504 kfree(mem[count]);
505 return -EIO;
506 }
507 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
508 /* _______________________This is for debugging purposes only _______________________*/
509 debug("b4 writing, start address is %x\n", func->mem[count]->start);
510 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
511 debug("after writing, the address is %x\n", bar[count]);
512 /* __________________________________________________________________________________*/
513
514 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
515 /* takes up another dword */
516 debug("inside mem 64 case, reg. mem, count %d\n", count);
517 count += 1;
518 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
519 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
520 }
521 }
522 } /* end of mem */
523 } /* end of for */
524
525 func->bus = 0; /* To indicate that this is not a PPB */
526 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
527 if ((irq > 0x00) && (irq < 0x05))
528 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
529
530 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
531 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
532
533 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_ROM_ADDRESS, 0x00L);
534 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
535
536 return 0;
537 }
538
539 /******************************************************************************
540 * This routine configures a PCI-2-PCI bridge and the functions behind it
541 * Parameters: pci_func
542 * Returns:
543 ******************************************************************************/
544 static int configure_bridge(struct pci_func **func_passed, u8 slotno)
545 {
546 int count;
547 int i;
548 int rc;
549 u8 sec_number;
550 u8 io_base;
551 u16 pfmem_base;
552 u32 bar[2];
553 u32 len[2];
554 u8 flag_io = 0;
555 u8 flag_mem = 0;
556 u8 flag_pfmem = 0;
557 u8 need_io_upper = 0;
558 u8 need_pfmem_upper = 0;
559 struct res_needed *amount_needed = NULL;
560 struct resource_node *io = NULL;
561 struct resource_node *bus_io[2] = {NULL, NULL};
562 struct resource_node *mem = NULL;
563 struct resource_node *bus_mem[2] = {NULL, NULL};
564 struct resource_node *mem_tmp = NULL;
565 struct resource_node *pfmem = NULL;
566 struct resource_node *bus_pfmem[2] = {NULL, NULL};
567 struct bus_node *bus;
568 u32 address[] = {
569 PCI_BASE_ADDRESS_0,
570 PCI_BASE_ADDRESS_1,
571 0
572 };
573 struct pci_func *func = *func_passed;
574 unsigned int devfn;
575 u8 irq;
576 int retval;
577
578 debug("%s - enter\n", __func__);
579
580 devfn = PCI_DEVFN(func->function, func->device);
581 ibmphp_pci_bus->number = func->busno;
582
583 /* Configuring necessary info for the bridge so that we could see the devices
584 * behind it
585 */
586
587 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, func->busno);
588
589 /* _____________________For debugging purposes only __________________________
590 pci_bus_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);
591 debug("primary # written into the bridge is %x\n", pri_number);
592 ___________________________________________________________________________*/
593
594 /* in EBDA, only get allocated 1 additional bus # per slot */
595 sec_number = find_sec_number(func->busno, slotno);
596 if (sec_number == 0xff) {
597 err("cannot allocate secondary bus number for the bridged device\n");
598 return -EINVAL;
599 }
600
601 debug("after find_sec_number, the number we got is %x\n", sec_number);
602 debug("AFTER FIND_SEC_NUMBER, func->busno IS %x\n", func->busno);
603
604 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, sec_number);
605
606 /* __________________For debugging purposes only __________________________________
607 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
608 debug("sec_number after write/read is %x\n", sec_number);
609 ________________________________________________________________________________*/
610
611 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, sec_number);
612
613 /* __________________For debugging purposes only ____________________________________
614 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sec_number);
615 debug("subordinate number after write/read is %x\n", sec_number);
616 __________________________________________________________________________________*/
617
618 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
619 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
620 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SEC_LATENCY_TIMER, LATENCY);
621
622 debug("func->busno is %x\n", func->busno);
623 debug("sec_number after writing is %x\n", sec_number);
624
625
626 /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
627 !!!!!!!!!!!!!!!NEED TO ADD!!! FAST BACK-TO-BACK ENABLE!!!!!!!!!!!!!!!!!!!!
628 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
629
630
631 /* First we need to allocate mem/io for the bridge itself in case it needs it */
632 for (count = 0; address[count]; count++) { /* for 2 BARs */
633 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
634 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
635
636 if (!bar[count]) {
637 /* This BAR is not implemented */
638 debug("so we come here then, eh?, count = %d\n", count);
639 continue;
640 }
641 // tmp_bar = bar[count];
642
643 debug("Bar %d wants %x\n", count, bar[count]);
644
645 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
646 /* This is IO */
647 len[count] = bar[count] & 0xFFFFFFFC;
648 len[count] = ~len[count] + 1;
649
650 debug("len[count] in IO = %x\n", len[count]);
651
652 bus_io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
653
654 if (!bus_io[count]) {
655 retval = -ENOMEM;
656 goto error;
657 }
658 bus_io[count]->type = IO;
659 bus_io[count]->busno = func->busno;
660 bus_io[count]->devfunc = PCI_DEVFN(func->device,
661 func->function);
662 bus_io[count]->len = len[count];
663 if (ibmphp_check_resource(bus_io[count], 0) == 0) {
664 ibmphp_add_resource(bus_io[count]);
665 func->io[count] = bus_io[count];
666 } else {
667 err("cannot allocate requested io for bus %x, device %x, len %x\n",
668 func->busno, func->device, len[count]);
669 kfree(bus_io[count]);
670 return -EIO;
671 }
672
673 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
674
675 } else {
676 /* This is Memory */
677 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
678 /* pfmem */
679 len[count] = bar[count] & 0xFFFFFFF0;
680 len[count] = ~len[count] + 1;
681
682 debug("len[count] in PFMEM = %x\n", len[count]);
683
684 bus_pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
685 if (!bus_pfmem[count]) {
686 retval = -ENOMEM;
687 goto error;
688 }
689 bus_pfmem[count]->type = PFMEM;
690 bus_pfmem[count]->busno = func->busno;
691 bus_pfmem[count]->devfunc = PCI_DEVFN(func->device,
692 func->function);
693 bus_pfmem[count]->len = len[count];
694 bus_pfmem[count]->fromMem = 0;
695 if (ibmphp_check_resource(bus_pfmem[count], 0) == 0) {
696 ibmphp_add_resource(bus_pfmem[count]);
697 func->pfmem[count] = bus_pfmem[count];
698 } else {
699 mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
700 if (!mem_tmp) {
701 retval = -ENOMEM;
702 goto error;
703 }
704 mem_tmp->type = MEM;
705 mem_tmp->busno = bus_pfmem[count]->busno;
706 mem_tmp->devfunc = bus_pfmem[count]->devfunc;
707 mem_tmp->len = bus_pfmem[count]->len;
708 if (ibmphp_check_resource(mem_tmp, 0) == 0) {
709 ibmphp_add_resource(mem_tmp);
710 bus_pfmem[count]->fromMem = 1;
711 bus_pfmem[count]->rangeno = mem_tmp->rangeno;
712 ibmphp_add_pfmem_from_mem(bus_pfmem[count]);
713 func->pfmem[count] = bus_pfmem[count];
714 } else {
715 err("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
716 func->busno, func->device, len[count]);
717 kfree(mem_tmp);
718 kfree(bus_pfmem[count]);
719 return -EIO;
720 }
721 }
722
723 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
724
725 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
726 /* takes up another dword */
727 count += 1;
728 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
729 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
730
731 }
732 } else {
733 /* regular memory */
734 len[count] = bar[count] & 0xFFFFFFF0;
735 len[count] = ~len[count] + 1;
736
737 debug("len[count] in Memory is %x\n", len[count]);
738
739 bus_mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
740 if (!bus_mem[count]) {
741 retval = -ENOMEM;
742 goto error;
743 }
744 bus_mem[count]->type = MEM;
745 bus_mem[count]->busno = func->busno;
746 bus_mem[count]->devfunc = PCI_DEVFN(func->device,
747 func->function);
748 bus_mem[count]->len = len[count];
749 if (ibmphp_check_resource(bus_mem[count], 0) == 0) {
750 ibmphp_add_resource(bus_mem[count]);
751 func->mem[count] = bus_mem[count];
752 } else {
753 err("cannot allocate requested mem for bus %x, device %x, len %x\n",
754 func->busno, func->device, len[count]);
755 kfree(bus_mem[count]);
756 return -EIO;
757 }
758
759 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
760
761 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
762 /* takes up another dword */
763 count += 1;
764 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
765 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
766
767 }
768 }
769 } /* end of mem */
770 } /* end of for */
771
772 /* Now need to see how much space the devices behind the bridge needed */
773 amount_needed = scan_behind_bridge(func, sec_number);
774 if (amount_needed == NULL)
775 return -ENOMEM;
776
777 ibmphp_pci_bus->number = func->busno;
778 debug("after coming back from scan_behind_bridge\n");
779 debug("amount_needed->not_correct = %x\n", amount_needed->not_correct);
780 debug("amount_needed->io = %x\n", amount_needed->io);
781 debug("amount_needed->mem = %x\n", amount_needed->mem);
782 debug("amount_needed->pfmem = %x\n", amount_needed->pfmem);
783
784 if (amount_needed->not_correct) {
785 debug("amount_needed is not correct\n");
786 for (count = 0; address[count]; count++) {
787 /* for 2 BARs */
788 if (bus_io[count]) {
789 ibmphp_remove_resource(bus_io[count]);
790 func->io[count] = NULL;
791 } else if (bus_pfmem[count]) {
792 ibmphp_remove_resource(bus_pfmem[count]);
793 func->pfmem[count] = NULL;
794 } else if (bus_mem[count]) {
795 ibmphp_remove_resource(bus_mem[count]);
796 func->mem[count] = NULL;
797 }
798 }
799 kfree(amount_needed);
800 return -ENODEV;
801 }
802
803 if (!amount_needed->io) {
804 debug("it doesn't want IO?\n");
805 flag_io = 1;
806 } else {
807 debug("it wants %x IO behind the bridge\n", amount_needed->io);
808 io = kzalloc(sizeof(*io), GFP_KERNEL);
809
810 if (!io) {
811 retval = -ENOMEM;
812 goto error;
813 }
814 io->type = IO;
815 io->busno = func->busno;
816 io->devfunc = PCI_DEVFN(func->device, func->function);
817 io->len = amount_needed->io;
818 if (ibmphp_check_resource(io, 1) == 0) {
819 debug("were we able to add io\n");
820 ibmphp_add_resource(io);
821 flag_io = 1;
822 }
823 }
824
825 if (!amount_needed->mem) {
826 debug("it doesn't want n.e.memory?\n");
827 flag_mem = 1;
828 } else {
829 debug("it wants %x memory behind the bridge\n", amount_needed->mem);
830 mem = kzalloc(sizeof(*mem), GFP_KERNEL);
831 if (!mem) {
832 retval = -ENOMEM;
833 goto error;
834 }
835 mem->type = MEM;
836 mem->busno = func->busno;
837 mem->devfunc = PCI_DEVFN(func->device, func->function);
838 mem->len = amount_needed->mem;
839 if (ibmphp_check_resource(mem, 1) == 0) {
840 ibmphp_add_resource(mem);
841 flag_mem = 1;
842 debug("were we able to add mem\n");
843 }
844 }
845
846 if (!amount_needed->pfmem) {
847 debug("it doesn't want n.e.pfmem mem?\n");
848 flag_pfmem = 1;
849 } else {
850 debug("it wants %x pfmemory behind the bridge\n", amount_needed->pfmem);
851 pfmem = kzalloc(sizeof(*pfmem), GFP_KERNEL);
852 if (!pfmem) {
853 retval = -ENOMEM;
854 goto error;
855 }
856 pfmem->type = PFMEM;
857 pfmem->busno = func->busno;
858 pfmem->devfunc = PCI_DEVFN(func->device, func->function);
859 pfmem->len = amount_needed->pfmem;
860 pfmem->fromMem = 0;
861 if (ibmphp_check_resource(pfmem, 1) == 0) {
862 ibmphp_add_resource(pfmem);
863 flag_pfmem = 1;
864 } else {
865 mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
866 if (!mem_tmp) {
867 retval = -ENOMEM;
868 goto error;
869 }
870 mem_tmp->type = MEM;
871 mem_tmp->busno = pfmem->busno;
872 mem_tmp->devfunc = pfmem->devfunc;
873 mem_tmp->len = pfmem->len;
874 if (ibmphp_check_resource(mem_tmp, 1) == 0) {
875 ibmphp_add_resource(mem_tmp);
876 pfmem->fromMem = 1;
877 pfmem->rangeno = mem_tmp->rangeno;
878 ibmphp_add_pfmem_from_mem(pfmem);
879 flag_pfmem = 1;
880 }
881 }
882 }
883
884 debug("b4 if (flag_io && flag_mem && flag_pfmem)\n");
885 debug("flag_io = %x, flag_mem = %x, flag_pfmem = %x\n", flag_io, flag_mem, flag_pfmem);
886
887 if (flag_io && flag_mem && flag_pfmem) {
888 /* If on bootup, there was a bridged card in this slot,
889 * then card was removed and ibmphp got unloaded and loaded
890 * back again, there's no way for us to remove the bus
891 * struct, so no need to kmalloc, can use existing node
892 */
893 bus = ibmphp_find_res_bus(sec_number);
894 if (!bus) {
895 bus = kzalloc(sizeof(*bus), GFP_KERNEL);
896 if (!bus) {
897 retval = -ENOMEM;
898 goto error;
899 }
900 bus->busno = sec_number;
901 debug("b4 adding new bus\n");
902 rc = add_new_bus(bus, io, mem, pfmem, func->busno);
903 } else if (!(bus->rangeIO) && !(bus->rangeMem) && !(bus->rangePFMem))
904 rc = add_new_bus(bus, io, mem, pfmem, 0xFF);
905 else {
906 err("expected bus structure not empty?\n");
907 retval = -EIO;
908 goto error;
909 }
910 if (rc) {
911 if (rc == -ENOMEM) {
912 ibmphp_remove_bus(bus, func->busno);
913 kfree(amount_needed);
914 return rc;
915 }
916 retval = rc;
917 goto error;
918 }
919 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &io_base);
920 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &pfmem_base);
921
922 if ((io_base & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
923 debug("io 32\n");
924 need_io_upper = 1;
925 }
926 if ((pfmem_base & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
927 debug("pfmem 64\n");
928 need_pfmem_upper = 1;
929 }
930
931 if (bus->noIORanges) {
932 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00 | bus->rangeIO->start >> 8);
933 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00 | bus->rangeIO->end >> 8);
934
935 /* _______________This is for debugging purposes only ____________________
936 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &temp);
937 debug("io_base = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
938 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, &temp);
939 debug("io_limit = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
940 ________________________________________________________________________*/
941
942 if (need_io_upper) { /* since can't support n.e.ways */
943 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_BASE_UPPER16, 0x0000);
944 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, 0x0000);
945 }
946 } else {
947 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00);
948 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00);
949 }
950
951 if (bus->noMemRanges) {
952 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0x0000 | bus->rangeMem->start >> 16);
953 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000 | bus->rangeMem->end >> 16);
954
955 /* ____________________This is for debugging purposes only ________________________
956 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, &temp);
957 debug("mem_base = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
958 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, &temp);
959 debug("mem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
960 __________________________________________________________________________________*/
961
962 } else {
963 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0xffff);
964 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000);
965 }
966 if (bus->noPFMemRanges) {
967 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0x0000 | bus->rangePFMem->start >> 16);
968 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000 | bus->rangePFMem->end >> 16);
969
970 /* __________________________This is for debugging purposes only _______________________
971 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &temp);
972 debug("pfmem_base = %x", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
973 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &temp);
974 debug("pfmem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
975 ______________________________________________________________________________________*/
976
977 if (need_pfmem_upper) { /* since can't support n.e.ways */
978 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_BASE_UPPER32, 0x00000000);
979 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_LIMIT_UPPER32, 0x00000000);
980 }
981 } else {
982 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0xffff);
983 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000);
984 }
985
986 debug("b4 writing control information\n");
987
988 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
989 if ((irq > 0x00) && (irq < 0x05))
990 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
991 /*
992 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, ctrl);
993 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_PARITY);
994 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_SERR);
995 */
996
997 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
998 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, 0x07);
999 for (i = 0; i < 32; i++) {
1000 if (amount_needed->devices[i]) {
1001 debug("device where devices[i] is 1 = %x\n", i);
1002 func->devices[i] = 1;
1003 }
1004 }
1005 func->bus = 1; /* For unconfiguring, to indicate it's PPB */
1006 func_passed = &func;
1007 debug("func->busno b4 returning is %x\n", func->busno);
1008 debug("func->busno b4 returning in the other structure is %x\n", (*func_passed)->busno);
1009 kfree(amount_needed);
1010 return 0;
1011 } else {
1012 err("Configuring bridge was unsuccessful...\n");
1013 mem_tmp = NULL;
1014 retval = -EIO;
1015 goto error;
1016 }
1017
1018 error:
1019 kfree(amount_needed);
1020 if (pfmem)
1021 ibmphp_remove_resource(pfmem);
1022 if (io)
1023 ibmphp_remove_resource(io);
1024 if (mem)
1025 ibmphp_remove_resource(mem);
1026 for (i = 0; i < 2; i++) { /* for 2 BARs */
1027 if (bus_io[i]) {
1028 ibmphp_remove_resource(bus_io[i]);
1029 func->io[i] = NULL;
1030 } else if (bus_pfmem[i]) {
1031 ibmphp_remove_resource(bus_pfmem[i]);
1032 func->pfmem[i] = NULL;
1033 } else if (bus_mem[i]) {
1034 ibmphp_remove_resource(bus_mem[i]);
1035 func->mem[i] = NULL;
1036 }
1037 }
1038 return retval;
1039 }
1040
1041 /*****************************************************************************
1042 * This function adds up the amount of resources needed behind the PPB bridge
1043 * and passes it to the configure_bridge function
1044 * Input: bridge function
1045 * Output: amount of resources needed
1046 *****************************************************************************/
1047 static struct res_needed *scan_behind_bridge(struct pci_func *func, u8 busno)
1048 {
1049 int count, len[6];
1050 u16 vendor_id;
1051 u8 hdr_type;
1052 u8 device, function;
1053 unsigned int devfn;
1054 int howmany = 0; /*this is to see if there are any devices behind the bridge */
1055
1056 u32 bar[6], class;
1057 u32 address[] = {
1058 PCI_BASE_ADDRESS_0,
1059 PCI_BASE_ADDRESS_1,
1060 PCI_BASE_ADDRESS_2,
1061 PCI_BASE_ADDRESS_3,
1062 PCI_BASE_ADDRESS_4,
1063 PCI_BASE_ADDRESS_5,
1064 0
1065 };
1066 struct res_needed *amount;
1067
1068 amount = kzalloc(sizeof(*amount), GFP_KERNEL);
1069 if (amount == NULL)
1070 return NULL;
1071
1072 ibmphp_pci_bus->number = busno;
1073
1074 debug("the bus_no behind the bridge is %x\n", busno);
1075 debug("scanning devices behind the bridge...\n");
1076 for (device = 0; device < 32; device++) {
1077 amount->devices[device] = 0;
1078 for (function = 0; function < 8; function++) {
1079 devfn = PCI_DEVFN(device, function);
1080
1081 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
1082
1083 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
1084 /* found correct device!!! */
1085 howmany++;
1086
1087 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
1088 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
1089
1090 debug("hdr_type behind the bridge is %x\n", hdr_type);
1091 if ((hdr_type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) {
1092 err("embedded bridges not supported for hot-plugging.\n");
1093 amount->not_correct = 1;
1094 return amount;
1095 }
1096
1097 class >>= 8; /* to take revision out, class = class.subclass.prog i/f */
1098 if (class == PCI_CLASS_NOT_DEFINED_VGA) {
1099 err("The device %x is VGA compatible and as is not supported for hot plugging. Please choose another device.\n", device);
1100 amount->not_correct = 1;
1101 return amount;
1102 } else if (class == PCI_CLASS_DISPLAY_VGA) {
1103 err("The device %x is not supported for hot plugging. Please choose another device.\n", device);
1104 amount->not_correct = 1;
1105 return amount;
1106 }
1107
1108 amount->devices[device] = 1;
1109
1110 for (count = 0; address[count]; count++) {
1111 /* for 6 BARs */
1112 /*
1113 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, address[count], &tmp);
1114 if (tmp & 0x01) // IO
1115 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFD);
1116 else // MEMORY
1117 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
1118 */
1119 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
1120 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
1121
1122 debug("what is bar[count]? %x, count = %d\n", bar[count], count);
1123
1124 if (!bar[count]) /* This BAR is not implemented */
1125 continue;
1126
1127 //tmp_bar = bar[count];
1128
1129 debug("count %d device %x function %x wants %x resources\n", count, device, function, bar[count]);
1130
1131 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
1132 /* This is IO */
1133 len[count] = bar[count] & 0xFFFFFFFC;
1134 len[count] = ~len[count] + 1;
1135 amount->io += len[count];
1136 } else {
1137 /* This is Memory */
1138 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
1139 /* pfmem */
1140 len[count] = bar[count] & 0xFFFFFFF0;
1141 len[count] = ~len[count] + 1;
1142 amount->pfmem += len[count];
1143 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64)
1144 /* takes up another dword */
1145 count += 1;
1146
1147 } else {
1148 /* regular memory */
1149 len[count] = bar[count] & 0xFFFFFFF0;
1150 len[count] = ~len[count] + 1;
1151 amount->mem += len[count];
1152 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
1153 /* takes up another dword */
1154 count += 1;
1155 }
1156 }
1157 }
1158 } /* end for */
1159 } /* end if (valid) */
1160 } /* end for */
1161 } /* end for */
1162
1163 if (!howmany)
1164 amount->not_correct = 1;
1165 else
1166 amount->not_correct = 0;
1167 if ((amount->io) && (amount->io < IOBRIDGE))
1168 amount->io = IOBRIDGE;
1169 if ((amount->mem) && (amount->mem < MEMBRIDGE))
1170 amount->mem = MEMBRIDGE;
1171 if ((amount->pfmem) && (amount->pfmem < MEMBRIDGE))
1172 amount->pfmem = MEMBRIDGE;
1173 return amount;
1174 }
1175
1176 /* The following 3 unconfigure_boot_ routines deal with the case when we had the card
1177 * upon bootup in the system, since we don't allocate func to such case, we need to read
1178 * the start addresses from pci config space and then find the corresponding entries in
1179 * our resource lists. The functions return either 0, -ENODEV, or -1 (general failure)
1180 * Change: we also call these functions even if we configured the card ourselves (i.e., not
1181 * the bootup case), since it should work same way
1182 */
1183 static int unconfigure_boot_device(u8 busno, u8 device, u8 function)
1184 {
1185 u32 start_address;
1186 u32 address[] = {
1187 PCI_BASE_ADDRESS_0,
1188 PCI_BASE_ADDRESS_1,
1189 PCI_BASE_ADDRESS_2,
1190 PCI_BASE_ADDRESS_3,
1191 PCI_BASE_ADDRESS_4,
1192 PCI_BASE_ADDRESS_5,
1193 0
1194 };
1195 int count;
1196 struct resource_node *io;
1197 struct resource_node *mem;
1198 struct resource_node *pfmem;
1199 struct bus_node *bus;
1200 u32 end_address;
1201 u32 temp_end;
1202 u32 size;
1203 u32 tmp_address;
1204 unsigned int devfn;
1205
1206 debug("%s - enter\n", __func__);
1207
1208 bus = ibmphp_find_res_bus(busno);
1209 if (!bus) {
1210 debug("cannot find corresponding bus.\n");
1211 return -EINVAL;
1212 }
1213
1214 devfn = PCI_DEVFN(device, function);
1215 ibmphp_pci_bus->number = busno;
1216 for (count = 0; address[count]; count++) { /* for 6 BARs */
1217 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address);
1218
1219 /* We can do this here, b/c by that time the device driver of the card has been stopped */
1220
1221 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
1222 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &size);
1223 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], start_address);
1224
1225 debug("start_address is %x\n", start_address);
1226 debug("busno, device, function %x %x %x\n", busno, device, function);
1227 if (!size) {
1228 /* This BAR is not implemented */
1229 debug("is this bar no implemented?, count = %d\n", count);
1230 continue;
1231 }
1232 tmp_address = start_address;
1233 if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
1234 /* This is IO */
1235 start_address &= PCI_BASE_ADDRESS_IO_MASK;
1236 size = size & 0xFFFFFFFC;
1237 size = ~size + 1;
1238 end_address = start_address + size - 1;
1239 if (ibmphp_find_resource(bus, start_address, &io, IO))
1240 goto report_search_failure;
1241
1242 debug("io->start = %x\n", io->start);
1243 temp_end = io->end;
1244 start_address = io->end + 1;
1245 ibmphp_remove_resource(io);
1246 /* This is needed b/c of the old I/O restrictions in the BIOS */
1247 while (temp_end < end_address) {
1248 if (ibmphp_find_resource(bus, start_address,
1249 &io, IO))
1250 goto report_search_failure;
1251
1252 debug("io->start = %x\n", io->start);
1253 temp_end = io->end;
1254 start_address = io->end + 1;
1255 ibmphp_remove_resource(io);
1256 }
1257
1258 /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
1259 } else {
1260 /* This is Memory */
1261 if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
1262 /* pfmem */
1263 debug("start address of pfmem is %x\n", start_address);
1264 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1265
1266 if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) {
1267 err("cannot find corresponding PFMEM resource to remove\n");
1268 return -EIO;
1269 }
1270 if (pfmem) {
1271 debug("pfmem->start = %x\n", pfmem->start);
1272
1273 ibmphp_remove_resource(pfmem);
1274 }
1275 } else {
1276 /* regular memory */
1277 debug("start address of mem is %x\n", start_address);
1278 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1279
1280 if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) {
1281 err("cannot find corresponding MEM resource to remove\n");
1282 return -EIO;
1283 }
1284 if (mem) {
1285 debug("mem->start = %x\n", mem->start);
1286
1287 ibmphp_remove_resource(mem);
1288 }
1289 }
1290 if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
1291 /* takes up another dword */
1292 count += 1;
1293 }
1294 } /* end of mem */
1295 } /* end of for */
1296
1297 return 0;
1298
1299 report_search_failure:
1300 err("cannot find corresponding IO resource to remove\n");
1301 return -EIO;
1302 }
1303
1304 static int unconfigure_boot_bridge(u8 busno, u8 device, u8 function)
1305 {
1306 int count;
1307 int bus_no, pri_no, sub_no, sec_no = 0;
1308 u32 start_address, tmp_address;
1309 u8 sec_number, sub_number, pri_number;
1310 struct resource_node *io = NULL;
1311 struct resource_node *mem = NULL;
1312 struct resource_node *pfmem = NULL;
1313 struct bus_node *bus;
1314 u32 address[] = {
1315 PCI_BASE_ADDRESS_0,
1316 PCI_BASE_ADDRESS_1,
1317 0
1318 };
1319 unsigned int devfn;
1320
1321 devfn = PCI_DEVFN(device, function);
1322 ibmphp_pci_bus->number = busno;
1323 bus_no = (int) busno;
1324 debug("busno is %x\n", busno);
1325 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);
1326 debug("%s - busno = %x, primary_number = %x\n", __func__, busno, pri_number);
1327
1328 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
1329 debug("sec_number is %x\n", sec_number);
1330 sec_no = (int) sec_number;
1331 pri_no = (int) pri_number;
1332 if (pri_no != bus_no) {
1333 err("primary numbers in our structures and pci config space don't match.\n");
1334 return -EINVAL;
1335 }
1336
1337 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sub_number);
1338 sub_no = (int) sub_number;
1339 debug("sub_no is %d, sec_no is %d\n", sub_no, sec_no);
1340 if (sec_no != sub_number) {
1341 err("there're more buses behind this bridge. Hot removal is not supported. Please choose another card\n");
1342 return -ENODEV;
1343 }
1344
1345 bus = ibmphp_find_res_bus(sec_number);
1346 if (!bus) {
1347 err("cannot find Bus structure for the bridged device\n");
1348 return -EINVAL;
1349 }
1350 debug("bus->busno is %x\n", bus->busno);
1351 debug("sec_number is %x\n", sec_number);
1352
1353 ibmphp_remove_bus(bus, busno);
1354
1355 for (count = 0; address[count]; count++) {
1356 /* for 2 BARs */
1357 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address);
1358
1359 if (!start_address) {
1360 /* This BAR is not implemented */
1361 continue;
1362 }
1363
1364 tmp_address = start_address;
1365
1366 if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
1367 /* This is IO */
1368 start_address &= PCI_BASE_ADDRESS_IO_MASK;
1369 if (ibmphp_find_resource(bus, start_address, &io, IO) < 0) {
1370 err("cannot find corresponding IO resource to remove\n");
1371 return -EIO;
1372 }
1373 if (io)
1374 debug("io->start = %x\n", io->start);
1375
1376 ibmphp_remove_resource(io);
1377
1378 /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
1379 } else {
1380 /* This is Memory */
1381 if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
1382 /* pfmem */
1383 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1384 if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) {
1385 err("cannot find corresponding PFMEM resource to remove\n");
1386 return -EINVAL;
1387 }
1388 if (pfmem) {
1389 debug("pfmem->start = %x\n", pfmem->start);
1390
1391 ibmphp_remove_resource(pfmem);
1392 }
1393 } else {
1394 /* regular memory */
1395 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1396 if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) {
1397 err("cannot find corresponding MEM resource to remove\n");
1398 return -EINVAL;
1399 }
1400 if (mem) {
1401 debug("mem->start = %x\n", mem->start);
1402
1403 ibmphp_remove_resource(mem);
1404 }
1405 }
1406 if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
1407 /* takes up another dword */
1408 count += 1;
1409 }
1410 } /* end of mem */
1411 } /* end of for */
1412 debug("%s - exiting, returning success\n", __func__);
1413 return 0;
1414 }
1415
1416 static int unconfigure_boot_card(struct slot *slot_cur)
1417 {
1418 u16 vendor_id;
1419 u32 class;
1420 u8 hdr_type;
1421 u8 device;
1422 u8 busno;
1423 u8 function;
1424 int rc;
1425 unsigned int devfn;
1426 u8 valid_device = 0x00; /* To see if we are ever able to find valid device and read it */
1427
1428 debug("%s - enter\n", __func__);
1429
1430 device = slot_cur->device;
1431 busno = slot_cur->bus;
1432
1433 debug("b4 for loop, device is %x\n", device);
1434 /* For every function on the card */
1435 for (function = 0x0; function < 0x08; function++) {
1436 devfn = PCI_DEVFN(device, function);
1437 ibmphp_pci_bus->number = busno;
1438
1439 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
1440
1441 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
1442 /* found correct device!!! */
1443 ++valid_device;
1444
1445 debug("%s - found correct device\n", __func__);
1446
1447 /* header: x x x x x x x x
1448 * | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge
1449 * |_=> 0 = single function device, 1 = multi-function device
1450 */
1451
1452 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
1453 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
1454
1455 debug("hdr_type %x, class %x\n", hdr_type, class);
1456 class >>= 8; /* to take revision out, class = class.subclass.prog i/f */
1457 if (class == PCI_CLASS_NOT_DEFINED_VGA) {
1458 err("The device %x function %x is VGA compatible and is not supported for hot removing. Please choose another device.\n", device, function);
1459 return -ENODEV;
1460 } else if (class == PCI_CLASS_DISPLAY_VGA) {
1461 err("The device %x function %x is not supported for hot removing. Please choose another device.\n", device, function);
1462 return -ENODEV;
1463 }
1464
1465 switch (hdr_type) {
1466 case PCI_HEADER_TYPE_NORMAL:
1467 rc = unconfigure_boot_device(busno, device, function);
1468 if (rc) {
1469 err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
1470 device, function, busno);
1471 return rc;
1472 }
1473 function = 0x8;
1474 break;
1475 case PCI_HEADER_TYPE_MULTIDEVICE:
1476 rc = unconfigure_boot_device(busno, device, function);
1477 if (rc) {
1478 err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
1479 device, function, busno);
1480 return rc;
1481 }
1482 break;
1483 case PCI_HEADER_TYPE_BRIDGE:
1484 class >>= 8;
1485 if (class != PCI_CLASS_BRIDGE_PCI) {
1486 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);
1487 return -ENODEV;
1488 }
1489 rc = unconfigure_boot_bridge(busno, device, function);
1490 if (rc != 0) {
1491 err("was not able to hot-remove PPB properly.\n");
1492 return rc;
1493 }
1494
1495 function = 0x8;
1496 break;
1497 case PCI_HEADER_TYPE_MULTIBRIDGE:
1498 class >>= 8;
1499 if (class != PCI_CLASS_BRIDGE_PCI) {
1500 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);
1501 return -ENODEV;
1502 }
1503 rc = unconfigure_boot_bridge(busno, device, function);
1504 if (rc != 0) {
1505 err("was not able to hot-remove PPB properly.\n");
1506 return rc;
1507 }
1508 break;
1509 default:
1510 err("MAJOR PROBLEM!!!! Cannot read device's header\n");
1511 return -1;
1512 break;
1513 } /* end of switch */
1514 } /* end of valid device */
1515 } /* end of for */
1516
1517 if (!valid_device) {
1518 err("Could not find device to unconfigure. Or could not read the card.\n");
1519 return -1;
1520 }
1521 return 0;
1522 }
1523
1524 /*
1525 * free the resources of the card (multi, single, or bridged)
1526 * Parameters: slot, flag to say if this is for removing entire module or just
1527 * unconfiguring the device
1528 * TO DO: will probably need to add some code in case there was some resource,
1529 * to remove it... this is from when we have errors in the configure_card...
1530 * !!!!!!!!!!!!!!!!!!!!!!!!!FOR BUSES!!!!!!!!!!!!
1531 * Returns: 0, -1, -ENODEV
1532 */
1533 int ibmphp_unconfigure_card(struct slot **slot_cur, int the_end)
1534 {
1535 int i;
1536 int count;
1537 int rc;
1538 struct slot *sl = *slot_cur;
1539 struct pci_func *cur_func = NULL;
1540 struct pci_func *temp_func;
1541
1542 debug("%s - enter\n", __func__);
1543
1544 if (!the_end) {
1545 /* Need to unconfigure the card */
1546 rc = unconfigure_boot_card(sl);
1547 if ((rc == -ENODEV) || (rc == -EIO) || (rc == -EINVAL)) {
1548 /* In all other cases, will still need to get rid of func structure if it exists */
1549 return rc;
1550 }
1551 }
1552
1553 if (sl->func) {
1554 cur_func = sl->func;
1555 while (cur_func) {
1556 /* TO DO: WILL MOST LIKELY NEED TO GET RID OF THE BUS STRUCTURE FROM RESOURCES AS WELL */
1557 if (cur_func->bus) {
1558 /* in other words, it's a PPB */
1559 count = 2;
1560 } else {
1561 count = 6;
1562 }
1563
1564 for (i = 0; i < count; i++) {
1565 if (cur_func->io[i]) {
1566 debug("io[%d] exists\n", i);
1567 if (the_end > 0)
1568 ibmphp_remove_resource(cur_func->io[i]);
1569 cur_func->io[i] = NULL;
1570 }
1571 if (cur_func->mem[i]) {
1572 debug("mem[%d] exists\n", i);
1573 if (the_end > 0)
1574 ibmphp_remove_resource(cur_func->mem[i]);
1575 cur_func->mem[i] = NULL;
1576 }
1577 if (cur_func->pfmem[i]) {
1578 debug("pfmem[%d] exists\n", i);
1579 if (the_end > 0)
1580 ibmphp_remove_resource(cur_func->pfmem[i]);
1581 cur_func->pfmem[i] = NULL;
1582 }
1583 }
1584
1585 temp_func = cur_func->next;
1586 kfree(cur_func);
1587 cur_func = temp_func;
1588 }
1589 }
1590
1591 sl->func = NULL;
1592 *slot_cur = sl;
1593 debug("%s - exit\n", __func__);
1594 return 0;
1595 }
1596
1597 /*
1598 * add a new bus resulting from hot-plugging a PPB bridge with devices
1599 *
1600 * Input: bus and the amount of resources needed (we know we can assign those,
1601 * since they've been checked already
1602 * Output: bus added to the correct spot
1603 * 0, -1, error
1604 */
1605 static int add_new_bus(struct bus_node *bus, struct resource_node *io, struct resource_node *mem, struct resource_node *pfmem, u8 parent_busno)
1606 {
1607 struct range_node *io_range = NULL;
1608 struct range_node *mem_range = NULL;
1609 struct range_node *pfmem_range = NULL;
1610 struct bus_node *cur_bus = NULL;
1611
1612 /* Trying to find the parent bus number */
1613 if (parent_busno != 0xFF) {
1614 cur_bus = ibmphp_find_res_bus(parent_busno);
1615 if (!cur_bus) {
1616 err("strange, cannot find bus which is supposed to be at the system... something is terribly wrong...\n");
1617 return -ENODEV;
1618 }
1619
1620 list_add(&bus->bus_list, &cur_bus->bus_list);
1621 }
1622 if (io) {
1623 io_range = kzalloc(sizeof(*io_range), GFP_KERNEL);
1624 if (!io_range)
1625 return -ENOMEM;
1626
1627 io_range->start = io->start;
1628 io_range->end = io->end;
1629 io_range->rangeno = 1;
1630 bus->noIORanges = 1;
1631 bus->rangeIO = io_range;
1632 }
1633 if (mem) {
1634 mem_range = kzalloc(sizeof(*mem_range), GFP_KERNEL);
1635 if (!mem_range)
1636 return -ENOMEM;
1637
1638 mem_range->start = mem->start;
1639 mem_range->end = mem->end;
1640 mem_range->rangeno = 1;
1641 bus->noMemRanges = 1;
1642 bus->rangeMem = mem_range;
1643 }
1644 if (pfmem) {
1645 pfmem_range = kzalloc(sizeof(*pfmem_range), GFP_KERNEL);
1646 if (!pfmem_range)
1647 return -ENOMEM;
1648
1649 pfmem_range->start = pfmem->start;
1650 pfmem_range->end = pfmem->end;
1651 pfmem_range->rangeno = 1;
1652 bus->noPFMemRanges = 1;
1653 bus->rangePFMem = pfmem_range;
1654 }
1655 return 0;
1656 }
1657
1658 /*
1659 * find the 1st available bus number for PPB to set as its secondary bus
1660 * Parameters: bus_number of the primary bus
1661 * Returns: bus_number of the secondary bus or 0xff in case of failure
1662 */
1663 static u8 find_sec_number(u8 primary_busno, u8 slotno)
1664 {
1665 int min, max;
1666 u8 busno;
1667 struct bus_info *bus;
1668 struct bus_node *bus_cur;
1669
1670 bus = ibmphp_find_same_bus_num(primary_busno);
1671 if (!bus) {
1672 err("cannot get slot range of the bus from the BIOS\n");
1673 return 0xff;
1674 }
1675 max = bus->slot_max;
1676 min = bus->slot_min;
1677 if ((slotno > max) || (slotno < min)) {
1678 err("got the wrong range\n");
1679 return 0xff;
1680 }
1681 busno = (u8) (slotno - (u8) min);
1682 busno += primary_busno + 0x01;
1683 bus_cur = ibmphp_find_res_bus(busno);
1684 /* either there is no such bus number, or there are no ranges, which
1685 * can only happen if we removed the bridged device in previous load
1686 * of the driver, and now only have the skeleton bus struct
1687 */
1688 if ((!bus_cur) || (!(bus_cur->rangeIO) && !(bus_cur->rangeMem) && !(bus_cur->rangePFMem)))
1689 return busno;
1690 return 0xff;
1691 }