This patch includes scripts to create multiple yaml file for different
[kvmfornfv.git] / kernel / drivers / pci / hotplug / ibmphp_pci.c
1 /*
2  * IBM Hot Plug Controller Driver
3  *
4  * Written By: Irene Zubarev, IBM Corporation
5  *
6  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
7  * Copyright (C) 2001,2002 IBM Corp.
8  *
9  * All rights reserved.
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or (at
14  * your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful, but
17  * WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19  * NON INFRINGEMENT.  See the GNU General Public License for more
20  * details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25  *
26  * Send feedback to <gregkh@us.ibm.com>
27  *
28  */
29
30 #include <linux/module.h>
31 #include <linux/slab.h>
32 #include <linux/pci.h>
33 #include <linux/list.h>
34 #include "ibmphp.h"
35
36
37 static int configure_device(struct pci_func *);
38 static int configure_bridge(struct pci_func **, u8);
39 static struct res_needed *scan_behind_bridge(struct pci_func *, u8);
40 static int add_new_bus (struct bus_node *, struct resource_node *, struct resource_node *, struct resource_node *, u8);
41 static u8 find_sec_number (u8 primary_busno, u8 slotno);
42
43 /*
44  * NOTE..... If BIOS doesn't provide default routing, we assign:
45  * 9 for SCSI, 10 for LAN adapters, and 11 for everything else.
46  * If adapter is bridged, then we assign 11 to it and devices behind it.
47  * We also assign the same irq numbers for multi function devices.
48  * These are PIC mode, so shouldn't matter n.e.ways (hopefully)
49  */
50 static void assign_alt_irq (struct pci_func *cur_func, u8 class_code)
51 {
52         int j;
53         for (j = 0; j < 4; j++) {
54                 if (cur_func->irq[j] == 0xff) {
55                         switch (class_code) {
56                                 case PCI_BASE_CLASS_STORAGE:
57                                         cur_func->irq[j] = SCSI_IRQ;
58                                         break;
59                                 case PCI_BASE_CLASS_NETWORK:
60                                         cur_func->irq[j] = LAN_IRQ;
61                                         break;
62                                 default:
63                                         cur_func->irq[j] = OTHER_IRQ;
64                                         break;
65                         }
66                 }
67         }
68 }
69
70 /*
71  * Configures the device to be added (will allocate needed resources if it
72  * can), the device can be a bridge or a regular pci device, can also be
73  * multi-functional
74  *
75  * Input: function to be added
76  *
77  * TO DO:  The error case with Multifunction device or multi function bridge,
78  * if there is an error, will need to go through all previous functions and
79  * unconfigure....or can add some code into unconfigure_card....
80  */
81 int ibmphp_configure_card (struct pci_func *func, u8 slotno)
82 {
83         u16 vendor_id;
84         u32 class;
85         u8 class_code;
86         u8 hdr_type, device, sec_number;
87         u8 function;
88         struct pci_func *newfunc;       /* for multi devices */
89         struct pci_func *cur_func, *prev_func;
90         int rc, i, j;
91         int cleanup_count;
92         u8 flag;
93         u8 valid_device = 0x00; /* to see if we are able to read from card any device info at all */
94
95         debug ("inside configure_card, func->busno = %x\n", func->busno);
96
97         device = func->device;
98         cur_func = func;
99
100         /* We only get bus and device from IRQ routing table.  So at this point,
101          * func->busno is correct, and func->device contains only device (at the 5
102          * highest bits)
103          */
104
105         /* For every function on the card */
106         for (function = 0x00; function < 0x08; function++) {
107                 unsigned int devfn = PCI_DEVFN(device, function);
108                 ibmphp_pci_bus->number = cur_func->busno;
109
110                 cur_func->function = function;
111
112                 debug ("inside the loop, cur_func->busno = %x, cur_func->device = %x, cur_func->function = %x\n",
113                         cur_func->busno, cur_func->device, cur_func->function);
114
115                 pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
116
117                 debug ("vendor_id is %x\n", vendor_id);
118                 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
119                         /* found correct device!!! */
120                         debug ("found valid device, vendor_id = %x\n", vendor_id);
121
122                         ++valid_device;
123
124                         /* header: x x x x x x x x
125                          *         | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge
126                          *         |_=> 0 = single function device, 1 = multi-function device
127                          */
128
129                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
130                         pci_bus_read_config_dword (ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
131
132                         class_code = class >> 24;
133                         debug ("hrd_type = %x, class = %x, class_code %x\n", hdr_type, class, class_code);
134                         class >>= 8;    /* to take revision out, class = class.subclass.prog i/f */
135                         if (class == PCI_CLASS_NOT_DEFINED_VGA) {
136                                 err ("The device %x is VGA compatible and as is not supported for hot plugging. "
137                                      "Please choose another device.\n", cur_func->device);
138                                 return -ENODEV;
139                         } else if (class == PCI_CLASS_DISPLAY_VGA) {
140                                 err ("The device %x is not supported for hot plugging. Please choose another device.\n",
141                                      cur_func->device);
142                                 return -ENODEV;
143                         }
144                         switch (hdr_type) {
145                                 case PCI_HEADER_TYPE_NORMAL:
146                                         debug ("single device case.... vendor id = %x, hdr_type = %x, class = %x\n", vendor_id, hdr_type, class);
147                                         assign_alt_irq (cur_func, class_code);
148                                         rc = configure_device(cur_func);
149                                         if (rc < 0) {
150                                                 /* We need to do this in case some other BARs were properly inserted */
151                                                 err ("was not able to configure devfunc %x on bus %x.\n",
152                                                      cur_func->device, cur_func->busno);
153                                                 cleanup_count = 6;
154                                                 goto error;
155                                         }
156                                         cur_func->next = NULL;
157                                         function = 0x8;
158                                         break;
159                                 case PCI_HEADER_TYPE_MULTIDEVICE:
160                                         assign_alt_irq (cur_func, class_code);
161                                         rc = configure_device(cur_func);
162                                         if (rc < 0) {
163                                                 /* We need to do this in case some other BARs were properly inserted */
164                                                 err ("was not able to configure devfunc %x on bus %x...bailing out\n",
165                                                      cur_func->device, cur_func->busno);
166                                                 cleanup_count = 6;
167                                                 goto error;
168                                         }
169                                         newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
170                                         if (!newfunc) {
171                                                 err ("out of system memory\n");
172                                                 return -ENOMEM;
173                                         }
174                                         newfunc->busno = cur_func->busno;
175                                         newfunc->device = device;
176                                         cur_func->next = newfunc;
177                                         cur_func = newfunc;
178                                         for (j = 0; j < 4; j++)
179                                                 newfunc->irq[j] = cur_func->irq[j];
180                                         break;
181                                 case PCI_HEADER_TYPE_MULTIBRIDGE:
182                                         class >>= 8;
183                                         if (class != PCI_CLASS_BRIDGE_PCI) {
184                                                 err ("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging.  Please insert another card.\n",
185                                                      cur_func->device);
186                                                 return -ENODEV;
187                                         }
188                                         assign_alt_irq (cur_func, class_code);
189                                         rc = configure_bridge (&cur_func, slotno);
190                                         if (rc == -ENODEV) {
191                                                 err ("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
192                                                 err ("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);
193                                                 return rc;
194                                         }
195                                         if (rc) {
196                                                 /* We need to do this in case some other BARs were properly inserted */
197                                                 err ("was not able to hot-add PPB properly.\n");
198                                                 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
199                                                 cleanup_count = 2;
200                                                 goto error;
201                                         }
202
203                                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
204                                         flag = 0;
205                                         for (i = 0; i < 32; i++) {
206                                                 if (func->devices[i]) {
207                                                         newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
208                                                         if (!newfunc) {
209                                                                 err ("out of system memory\n");
210                                                                 return -ENOMEM;
211                                                         }
212                                                         newfunc->busno = sec_number;
213                                                         newfunc->device = (u8) i;
214                                                         for (j = 0; j < 4; j++)
215                                                                 newfunc->irq[j] = cur_func->irq[j];
216
217                                                         if (flag) {
218                                                                 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
219                                                                 prev_func->next = newfunc;
220                                                         } else
221                                                                 cur_func->next = newfunc;
222
223                                                         rc = ibmphp_configure_card (newfunc, slotno);
224                                                         /* This could only happen if kmalloc failed */
225                                                         if (rc) {
226                                                                 /* We need to do this in case bridge itself got configured properly, but devices behind it failed */
227                                                                 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
228                                                                 cleanup_count = 2;
229                                                                 goto error;
230                                                         }
231                                                         flag = 1;
232                                                 }
233                                         }
234
235                                         newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
236                                         if (!newfunc) {
237                                                 err ("out of system memory\n");
238                                                 return -ENOMEM;
239                                         }
240                                         newfunc->busno = cur_func->busno;
241                                         newfunc->device = device;
242                                         for (j = 0; j < 4; j++)
243                                                 newfunc->irq[j] = cur_func->irq[j];
244                                         for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
245                                         prev_func->next = newfunc;
246                                         cur_func = newfunc;
247                                         break;
248                                 case PCI_HEADER_TYPE_BRIDGE:
249                                         class >>= 8;
250                                         debug ("class now is %x\n", class);
251                                         if (class != PCI_CLASS_BRIDGE_PCI) {
252                                                 err ("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging.  Please insert another card.\n",
253                                                      cur_func->device);
254                                                 return -ENODEV;
255                                         }
256
257                                         assign_alt_irq (cur_func, class_code);
258
259                                         debug ("cur_func->busno b4 configure_bridge is %x\n", cur_func->busno);
260                                         rc = configure_bridge (&cur_func, slotno);
261                                         if (rc == -ENODEV) {
262                                                 err ("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
263                                                 err ("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);
264                                                 return rc;
265                                         }
266                                         if (rc) {
267                                                 /* We need to do this in case some other BARs were properly inserted */
268                                                 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
269                                                 err ("was not able to hot-add PPB properly.\n");
270                                                 cleanup_count = 2;
271                                                 goto error;
272                                         }
273                                         debug ("cur_func->busno = %x, device = %x, function = %x\n",
274                                                 cur_func->busno, device, function);
275                                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
276                                         debug ("after configuring bridge..., sec_number = %x\n", sec_number);
277                                         flag = 0;
278                                         for (i = 0; i < 32; i++) {
279                                                 if (func->devices[i]) {
280                                                         debug ("inside for loop, device is %x\n", i);
281                                                         newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
282                                                         if (!newfunc) {
283                                                                 err (" out of system memory\n");
284                                                                 return -ENOMEM;
285                                                         }
286                                                         newfunc->busno = sec_number;
287                                                         newfunc->device = (u8) i;
288                                                         for (j = 0; j < 4; j++)
289                                                                 newfunc->irq[j] = cur_func->irq[j];
290
291                                                         if (flag) {
292                                                                 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
293                                                                 prev_func->next = newfunc;
294                                                         } else
295                                                                 cur_func->next = newfunc;
296
297                                                         rc = ibmphp_configure_card (newfunc, slotno);
298
299                                                         /* Again, this case should not happen... For complete paranoia, will need to call remove_bus */
300                                                         if (rc) {
301                                                                 /* We need to do this in case some other BARs were properly inserted */
302                                                                 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
303                                                                 cleanup_count = 2;
304                                                                 goto error;
305                                                         }
306                                                         flag = 1;
307                                                 }
308                                         }
309
310                                         function = 0x8;
311                                         break;
312                                 default:
313                                         err ("MAJOR PROBLEM!!!!, header type not supported? %x\n", hdr_type);
314                                         return -ENXIO;
315                                         break;
316                         }       /* end of switch */
317                 }       /* end of valid device */
318         }       /* end of for */
319
320         if (!valid_device) {
321                 err ("Cannot find any valid devices on the card.  Or unable to read from card.\n");
322                 return -ENODEV;
323         }
324
325         return 0;
326
327 error:
328         for (i = 0; i < cleanup_count; i++) {
329                 if (cur_func->io[i]) {
330                         ibmphp_remove_resource (cur_func->io[i]);
331                         cur_func->io[i] = NULL;
332                 } else if (cur_func->pfmem[i]) {
333                         ibmphp_remove_resource (cur_func->pfmem[i]);
334                         cur_func->pfmem[i] = NULL;
335                 } else if (cur_func->mem[i]) {
336                         ibmphp_remove_resource (cur_func->mem[i]);
337                         cur_func->mem[i] = NULL;
338                 }
339         }
340         return rc;
341 }
342
343 /*
344  * This function configures the pci BARs of a single device.
345  * Input: pointer to the pci_func
346  * Output: configured PCI, 0, or error
347  */
348 static int configure_device (struct pci_func *func)
349 {
350         u32 bar[6];
351         u32 address[] = {
352                 PCI_BASE_ADDRESS_0,
353                 PCI_BASE_ADDRESS_1,
354                 PCI_BASE_ADDRESS_2,
355                 PCI_BASE_ADDRESS_3,
356                 PCI_BASE_ADDRESS_4,
357                 PCI_BASE_ADDRESS_5,
358                 0
359         };
360         u8 irq;
361         int count;
362         int len[6];
363         struct resource_node *io[6];
364         struct resource_node *mem[6];
365         struct resource_node *mem_tmp;
366         struct resource_node *pfmem[6];
367         unsigned int devfn;
368
369         debug ("%s - inside\n", __func__);
370
371         devfn = PCI_DEVFN(func->device, func->function);
372         ibmphp_pci_bus->number = func->busno;
373
374         for (count = 0; address[count]; count++) {      /* for 6 BARs */
375
376                 /* not sure if i need this.  per scott, said maybe need * something like this
377                    if devices don't adhere 100% to the spec, so don't want to write
378                    to the reserved bits
379
380                 pcibios_read_config_byte(cur_func->busno, cur_func->device,
381                 PCI_BASE_ADDRESS_0 + 4 * count, &tmp);
382                 if (tmp & 0x01) // IO
383                         pcibios_write_config_dword(cur_func->busno, cur_func->device,
384                         PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFD);
385                 else  // Memory
386                         pcibios_write_config_dword(cur_func->busno, cur_func->device,
387                         PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFF);
388                  */
389                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
390                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
391
392                 if (!bar[count])        /* This BAR is not implemented */
393                         continue;
394
395                 debug ("Device %x BAR %d wants %x\n", func->device, count, bar[count]);
396
397                 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
398                         /* This is IO */
399                         debug ("inside IO SPACE\n");
400
401                         len[count] = bar[count] & 0xFFFFFFFC;
402                         len[count] = ~len[count] + 1;
403
404                         debug ("len[count] in IO %x, count %d\n", len[count], count);
405
406                         io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
407
408                         if (!io[count]) {
409                                 err ("out of system memory\n");
410                                 return -ENOMEM;
411                         }
412                         io[count]->type = IO;
413                         io[count]->busno = func->busno;
414                         io[count]->devfunc = PCI_DEVFN(func->device, func->function);
415                         io[count]->len = len[count];
416                         if (ibmphp_check_resource(io[count], 0) == 0) {
417                                 ibmphp_add_resource (io[count]);
418                                 func->io[count] = io[count];
419                         } else {
420                                 err ("cannot allocate requested io for bus %x device %x function %x len %x\n",
421                                      func->busno, func->device, func->function, len[count]);
422                                 kfree (io[count]);
423                                 return -EIO;
424                         }
425                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
426
427                         /* _______________This is for debugging purposes only_____________________ */
428                         debug ("b4 writing, the IO address is %x\n", func->io[count]->start);
429                         pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
430                         debug ("after writing.... the start address is %x\n", bar[count]);
431                         /* _________________________________________________________________________*/
432
433                 } else {
434                         /* This is Memory */
435                         if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
436                                 /* pfmem */
437                                 debug ("PFMEM SPACE\n");
438
439                                 len[count] = bar[count] & 0xFFFFFFF0;
440                                 len[count] = ~len[count] + 1;
441
442                                 debug ("len[count] in PFMEM %x, count %d\n", len[count], count);
443
444                                 pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
445                                 if (!pfmem[count]) {
446                                         err ("out of system memory\n");
447                                         return -ENOMEM;
448                                 }
449                                 pfmem[count]->type = PFMEM;
450                                 pfmem[count]->busno = func->busno;
451                                 pfmem[count]->devfunc = PCI_DEVFN(func->device,
452                                                         func->function);
453                                 pfmem[count]->len = len[count];
454                                 pfmem[count]->fromMem = 0;
455                                 if (ibmphp_check_resource (pfmem[count], 0) == 0) {
456                                         ibmphp_add_resource (pfmem[count]);
457                                         func->pfmem[count] = pfmem[count];
458                                 } else {
459                                         mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
460                                         if (!mem_tmp) {
461                                                 err ("out of system memory\n");
462                                                 kfree (pfmem[count]);
463                                                 return -ENOMEM;
464                                         }
465                                         mem_tmp->type = MEM;
466                                         mem_tmp->busno = pfmem[count]->busno;
467                                         mem_tmp->devfunc = pfmem[count]->devfunc;
468                                         mem_tmp->len = pfmem[count]->len;
469                                         debug ("there's no pfmem... going into mem.\n");
470                                         if (ibmphp_check_resource (mem_tmp, 0) == 0) {
471                                                 ibmphp_add_resource (mem_tmp);
472                                                 pfmem[count]->fromMem = 1;
473                                                 pfmem[count]->rangeno = mem_tmp->rangeno;
474                                                 pfmem[count]->start = mem_tmp->start;
475                                                 pfmem[count]->end = mem_tmp->end;
476                                                 ibmphp_add_pfmem_from_mem (pfmem[count]);
477                                                 func->pfmem[count] = pfmem[count];
478                                         } else {
479                                                 err ("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
480                                                      func->busno, func->device, len[count]);
481                                                 kfree (mem_tmp);
482                                                 kfree (pfmem[count]);
483                                                 return -EIO;
484                                         }
485                                 }
486
487                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
488
489                                 /*_______________This is for debugging purposes only______________________________*/
490                                 debug ("b4 writing, start address is %x\n", func->pfmem[count]->start);
491                                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
492                                 debug ("after writing, start address is %x\n", bar[count]);
493                                 /*_________________________________________________________________________________*/
494
495                                 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {        /* takes up another dword */
496                                         debug ("inside the mem 64 case, count %d\n", count);
497                                         count += 1;
498                                         /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
499                                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0x00000000);
500                                 }
501                         } else {
502                                 /* regular memory */
503                                 debug ("REGULAR MEM SPACE\n");
504
505                                 len[count] = bar[count] & 0xFFFFFFF0;
506                                 len[count] = ~len[count] + 1;
507
508                                 debug ("len[count] in Mem %x, count %d\n", len[count], count);
509
510                                 mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
511                                 if (!mem[count]) {
512                                         err ("out of system memory\n");
513                                         return -ENOMEM;
514                                 }
515                                 mem[count]->type = MEM;
516                                 mem[count]->busno = func->busno;
517                                 mem[count]->devfunc = PCI_DEVFN(func->device,
518                                                         func->function);
519                                 mem[count]->len = len[count];
520                                 if (ibmphp_check_resource (mem[count], 0) == 0) {
521                                         ibmphp_add_resource (mem[count]);
522                                         func->mem[count] = mem[count];
523                                 } else {
524                                         err ("cannot allocate requested mem for bus %x, device %x, len %x\n",
525                                              func->busno, func->device, len[count]);
526                                         kfree (mem[count]);
527                                         return -EIO;
528                                 }
529                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
530                                 /* _______________________This is for debugging purposes only _______________________*/
531                                 debug ("b4 writing, start address is %x\n", func->mem[count]->start);
532                                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
533                                 debug ("after writing, the address is %x\n", bar[count]);
534                                 /* __________________________________________________________________________________*/
535
536                                 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
537                                         /* takes up another dword */
538                                         debug ("inside mem 64 case, reg. mem, count %d\n", count);
539                                         count += 1;
540                                         /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
541                                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0x00000000);
542                                 }
543                         }
544                 }               /* end of mem */
545         }                       /* end of for */
546
547         func->bus = 0;          /* To indicate that this is not a PPB */
548         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
549         if ((irq > 0x00) && (irq < 0x05))
550                 pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
551
552         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
553         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
554
555         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, PCI_ROM_ADDRESS, 0x00L);
556         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
557
558         return 0;
559 }
560
561 /******************************************************************************
562  * This routine configures a PCI-2-PCI bridge and the functions behind it
563  * Parameters: pci_func
564  * Returns:
565  ******************************************************************************/
566 static int configure_bridge (struct pci_func **func_passed, u8 slotno)
567 {
568         int count;
569         int i;
570         int rc;
571         u8 sec_number;
572         u8 io_base;
573         u16 pfmem_base;
574         u32 bar[2];
575         u32 len[2];
576         u8 flag_io = 0;
577         u8 flag_mem = 0;
578         u8 flag_pfmem = 0;
579         u8 need_io_upper = 0;
580         u8 need_pfmem_upper = 0;
581         struct res_needed *amount_needed = NULL;
582         struct resource_node *io = NULL;
583         struct resource_node *bus_io[2] = {NULL, NULL};
584         struct resource_node *mem = NULL;
585         struct resource_node *bus_mem[2] = {NULL, NULL};
586         struct resource_node *mem_tmp = NULL;
587         struct resource_node *pfmem = NULL;
588         struct resource_node *bus_pfmem[2] = {NULL, NULL};
589         struct bus_node *bus;
590         u32 address[] = {
591                 PCI_BASE_ADDRESS_0,
592                 PCI_BASE_ADDRESS_1,
593                 0
594         };
595         struct pci_func *func = *func_passed;
596         unsigned int devfn;
597         u8 irq;
598         int retval;
599
600         debug ("%s - enter\n", __func__);
601
602         devfn = PCI_DEVFN(func->function, func->device);
603         ibmphp_pci_bus->number = func->busno;
604
605         /* Configuring necessary info for the bridge so that we could see the devices
606          * behind it
607          */
608
609         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, func->busno);
610
611         /* _____________________For debugging purposes only __________________________
612         pci_bus_config_byte (ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);
613         debug ("primary # written into the bridge is %x\n", pri_number);
614          ___________________________________________________________________________*/
615
616         /* in EBDA, only get allocated 1 additional bus # per slot */
617         sec_number = find_sec_number (func->busno, slotno);
618         if (sec_number == 0xff) {
619                 err ("cannot allocate secondary bus number for the bridged device\n");
620                 return -EINVAL;
621         }
622
623         debug ("after find_sec_number, the number we got is %x\n", sec_number);
624         debug ("AFTER FIND_SEC_NUMBER, func->busno IS %x\n", func->busno);
625
626         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, sec_number);
627
628         /* __________________For debugging purposes only __________________________________
629         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
630         debug ("sec_number after write/read is %x\n", sec_number);
631          ________________________________________________________________________________*/
632
633         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, sec_number);
634
635         /* __________________For debugging purposes only ____________________________________
636         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sec_number);
637         debug ("subordinate number after write/read is %x\n", sec_number);
638          __________________________________________________________________________________*/
639
640         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
641         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
642         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_SEC_LATENCY_TIMER, LATENCY);
643
644         debug ("func->busno is %x\n", func->busno);
645         debug ("sec_number after writing is %x\n", sec_number);
646
647
648         /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
649            !!!!!!!!!!!!!!!NEED TO ADD!!!  FAST BACK-TO-BACK ENABLE!!!!!!!!!!!!!!!!!!!!
650            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
651
652
653         /* First we need to allocate mem/io for the bridge itself in case it needs it */
654         for (count = 0; address[count]; count++) {      /* for 2 BARs */
655                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
656                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
657
658                 if (!bar[count]) {
659                         /* This BAR is not implemented */
660                         debug ("so we come here then, eh?, count = %d\n", count);
661                         continue;
662                 }
663                 //  tmp_bar = bar[count];
664
665                 debug ("Bar %d wants %x\n", count, bar[count]);
666
667                 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
668                         /* This is IO */
669                         len[count] = bar[count] & 0xFFFFFFFC;
670                         len[count] = ~len[count] + 1;
671
672                         debug ("len[count] in IO = %x\n", len[count]);
673
674                         bus_io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
675
676                         if (!bus_io[count]) {
677                                 err ("out of system memory\n");
678                                 retval = -ENOMEM;
679                                 goto error;
680                         }
681                         bus_io[count]->type = IO;
682                         bus_io[count]->busno = func->busno;
683                         bus_io[count]->devfunc = PCI_DEVFN(func->device,
684                                                         func->function);
685                         bus_io[count]->len = len[count];
686                         if (ibmphp_check_resource (bus_io[count], 0) == 0) {
687                                 ibmphp_add_resource (bus_io[count]);
688                                 func->io[count] = bus_io[count];
689                         } else {
690                                 err ("cannot allocate requested io for bus %x, device %x, len %x\n",
691                                      func->busno, func->device, len[count]);
692                                 kfree (bus_io[count]);
693                                 return -EIO;
694                         }
695
696                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
697
698                 } else {
699                         /* This is Memory */
700                         if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
701                                 /* pfmem */
702                                 len[count] = bar[count] & 0xFFFFFFF0;
703                                 len[count] = ~len[count] + 1;
704
705                                 debug ("len[count] in PFMEM = %x\n", len[count]);
706
707                                 bus_pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
708                                 if (!bus_pfmem[count]) {
709                                         err ("out of system memory\n");
710                                         retval = -ENOMEM;
711                                         goto error;
712                                 }
713                                 bus_pfmem[count]->type = PFMEM;
714                                 bus_pfmem[count]->busno = func->busno;
715                                 bus_pfmem[count]->devfunc = PCI_DEVFN(func->device,
716                                                         func->function);
717                                 bus_pfmem[count]->len = len[count];
718                                 bus_pfmem[count]->fromMem = 0;
719                                 if (ibmphp_check_resource (bus_pfmem[count], 0) == 0) {
720                                         ibmphp_add_resource (bus_pfmem[count]);
721                                         func->pfmem[count] = bus_pfmem[count];
722                                 } else {
723                                         mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
724                                         if (!mem_tmp) {
725                                                 err ("out of system memory\n");
726                                                 retval = -ENOMEM;
727                                                 goto error;
728                                         }
729                                         mem_tmp->type = MEM;
730                                         mem_tmp->busno = bus_pfmem[count]->busno;
731                                         mem_tmp->devfunc = bus_pfmem[count]->devfunc;
732                                         mem_tmp->len = bus_pfmem[count]->len;
733                                         if (ibmphp_check_resource (mem_tmp, 0) == 0) {
734                                                 ibmphp_add_resource (mem_tmp);
735                                                 bus_pfmem[count]->fromMem = 1;
736                                                 bus_pfmem[count]->rangeno = mem_tmp->rangeno;
737                                                 ibmphp_add_pfmem_from_mem (bus_pfmem[count]);
738                                                 func->pfmem[count] = bus_pfmem[count];
739                                         } else {
740                                                 err ("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
741                                                      func->busno, func->device, len[count]);
742                                                 kfree (mem_tmp);
743                                                 kfree (bus_pfmem[count]);
744                                                 return -EIO;
745                                         }
746                                 }
747
748                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
749
750                                 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
751                                         /* takes up another dword */
752                                         count += 1;
753                                         /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
754                                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0x00000000);
755
756                                 }
757                         } else {
758                                 /* regular memory */
759                                 len[count] = bar[count] & 0xFFFFFFF0;
760                                 len[count] = ~len[count] + 1;
761
762                                 debug ("len[count] in Memory is %x\n", len[count]);
763
764                                 bus_mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
765                                 if (!bus_mem[count]) {
766                                         err ("out of system memory\n");
767                                         retval = -ENOMEM;
768                                         goto error;
769                                 }
770                                 bus_mem[count]->type = MEM;
771                                 bus_mem[count]->busno = func->busno;
772                                 bus_mem[count]->devfunc = PCI_DEVFN(func->device,
773                                                         func->function);
774                                 bus_mem[count]->len = len[count];
775                                 if (ibmphp_check_resource (bus_mem[count], 0) == 0) {
776                                         ibmphp_add_resource (bus_mem[count]);
777                                         func->mem[count] = bus_mem[count];
778                                 } else {
779                                         err ("cannot allocate requested mem for bus %x, device %x, len %x\n",
780                                              func->busno, func->device, len[count]);
781                                         kfree (bus_mem[count]);
782                                         return -EIO;
783                                 }
784
785                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
786
787                                 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
788                                         /* takes up another dword */
789                                         count += 1;
790                                         /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
791                                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0x00000000);
792
793                                 }
794                         }
795                 }               /* end of mem */
796         }                       /* end of for  */
797
798         /* Now need to see how much space the devices behind the bridge needed */
799         amount_needed = scan_behind_bridge (func, sec_number);
800         if (amount_needed == NULL)
801                 return -ENOMEM;
802
803         ibmphp_pci_bus->number = func->busno;
804         debug ("after coming back from scan_behind_bridge\n");
805         debug ("amount_needed->not_correct = %x\n", amount_needed->not_correct);
806         debug ("amount_needed->io = %x\n", amount_needed->io);
807         debug ("amount_needed->mem = %x\n", amount_needed->mem);
808         debug ("amount_needed->pfmem =  %x\n", amount_needed->pfmem);
809
810         if (amount_needed->not_correct) {
811                 debug ("amount_needed is not correct\n");
812                 for (count = 0; address[count]; count++) {
813                         /* for 2 BARs */
814                         if (bus_io[count]) {
815                                 ibmphp_remove_resource (bus_io[count]);
816                                 func->io[count] = NULL;
817                         } else if (bus_pfmem[count]) {
818                                 ibmphp_remove_resource (bus_pfmem[count]);
819                                 func->pfmem[count] = NULL;
820                         } else if (bus_mem[count]) {
821                                 ibmphp_remove_resource (bus_mem[count]);
822                                 func->mem[count] = NULL;
823                         }
824                 }
825                 kfree (amount_needed);
826                 return -ENODEV;
827         }
828
829         if (!amount_needed->io) {
830                 debug ("it doesn't want IO?\n");
831                 flag_io = 1;
832         } else {
833                 debug ("it wants %x IO behind the bridge\n", amount_needed->io);
834                 io = kzalloc(sizeof(*io), GFP_KERNEL);
835
836                 if (!io) {
837                         err ("out of system memory\n");
838                         retval = -ENOMEM;
839                         goto error;
840                 }
841                 io->type = IO;
842                 io->busno = func->busno;
843                 io->devfunc = PCI_DEVFN(func->device, func->function);
844                 io->len = amount_needed->io;
845                 if (ibmphp_check_resource (io, 1) == 0) {
846                         debug ("were we able to add io\n");
847                         ibmphp_add_resource (io);
848                         flag_io = 1;
849                 }
850         }
851
852         if (!amount_needed->mem) {
853                 debug ("it doesn't want n.e.memory?\n");
854                 flag_mem = 1;
855         } else {
856                 debug ("it wants %x memory behind the bridge\n", amount_needed->mem);
857                 mem = kzalloc(sizeof(*mem), GFP_KERNEL);
858                 if (!mem) {
859                         err ("out of system memory\n");
860                         retval = -ENOMEM;
861                         goto error;
862                 }
863                 mem->type = MEM;
864                 mem->busno = func->busno;
865                 mem->devfunc = PCI_DEVFN(func->device, func->function);
866                 mem->len = amount_needed->mem;
867                 if (ibmphp_check_resource (mem, 1) == 0) {
868                         ibmphp_add_resource (mem);
869                         flag_mem = 1;
870                         debug ("were we able to add mem\n");
871                 }
872         }
873
874         if (!amount_needed->pfmem) {
875                 debug ("it doesn't want n.e.pfmem mem?\n");
876                 flag_pfmem = 1;
877         } else {
878                 debug ("it wants %x pfmemory behind the bridge\n", amount_needed->pfmem);
879                 pfmem = kzalloc(sizeof(*pfmem), GFP_KERNEL);
880                 if (!pfmem) {
881                         err ("out of system memory\n");
882                         retval = -ENOMEM;
883                         goto error;
884                 }
885                 pfmem->type = PFMEM;
886                 pfmem->busno = func->busno;
887                 pfmem->devfunc = PCI_DEVFN(func->device, func->function);
888                 pfmem->len = amount_needed->pfmem;
889                 pfmem->fromMem = 0;
890                 if (ibmphp_check_resource (pfmem, 1) == 0) {
891                         ibmphp_add_resource (pfmem);
892                         flag_pfmem = 1;
893                 } else {
894                         mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
895                         if (!mem_tmp) {
896                                 err ("out of system memory\n");
897                                 retval = -ENOMEM;
898                                 goto error;
899                         }
900                         mem_tmp->type = MEM;
901                         mem_tmp->busno = pfmem->busno;
902                         mem_tmp->devfunc = pfmem->devfunc;
903                         mem_tmp->len = pfmem->len;
904                         if (ibmphp_check_resource (mem_tmp, 1) == 0) {
905                                 ibmphp_add_resource (mem_tmp);
906                                 pfmem->fromMem = 1;
907                                 pfmem->rangeno = mem_tmp->rangeno;
908                                 ibmphp_add_pfmem_from_mem (pfmem);
909                                 flag_pfmem = 1;
910                         }
911                 }
912         }
913
914         debug ("b4 if (flag_io && flag_mem && flag_pfmem)\n");
915         debug ("flag_io = %x, flag_mem = %x, flag_pfmem = %x\n", flag_io, flag_mem, flag_pfmem);
916
917         if (flag_io && flag_mem && flag_pfmem) {
918                 /* If on bootup, there was a bridged card in this slot,
919                  * then card was removed and ibmphp got unloaded and loaded
920                  * back again, there's no way for us to remove the bus
921                  * struct, so no need to kmalloc, can use existing node
922                  */
923                 bus = ibmphp_find_res_bus (sec_number);
924                 if (!bus) {
925                         bus = kzalloc(sizeof(*bus), GFP_KERNEL);
926                         if (!bus) {
927                                 err ("out of system memory\n");
928                                 retval = -ENOMEM;
929                                 goto error;
930                         }
931                         bus->busno = sec_number;
932                         debug ("b4 adding new bus\n");
933                         rc = add_new_bus (bus, io, mem, pfmem, func->busno);
934                 } else if (!(bus->rangeIO) && !(bus->rangeMem) && !(bus->rangePFMem))
935                         rc = add_new_bus (bus, io, mem, pfmem, 0xFF);
936                 else {
937                         err ("expected bus structure not empty?\n");
938                         retval = -EIO;
939                         goto error;
940                 }
941                 if (rc) {
942                         if (rc == -ENOMEM) {
943                                 ibmphp_remove_bus (bus, func->busno);
944                                 kfree (amount_needed);
945                                 return rc;
946                         }
947                         retval = rc;
948                         goto error;
949                 }
950                 pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_IO_BASE, &io_base);
951                 pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &pfmem_base);
952
953                 if ((io_base & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
954                         debug ("io 32\n");
955                         need_io_upper = 1;
956                 }
957                 if ((pfmem_base & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
958                         debug ("pfmem 64\n");
959                         need_pfmem_upper = 1;
960                 }
961
962                 if (bus->noIORanges) {
963                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00 | bus->rangeIO->start >> 8);
964                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00 | bus->rangeIO->end >> 8);
965
966                         /* _______________This is for debugging purposes only ____________________
967                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_IO_BASE, &temp);
968                         debug ("io_base = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
969                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_IO_LIMIT, &temp);
970                         debug ("io_limit = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
971                          ________________________________________________________________________*/
972
973                         if (need_io_upper) {    /* since can't support n.e.ways */
974                                 pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_IO_BASE_UPPER16, 0x0000);
975                                 pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, 0x0000);
976                         }
977                 } else {
978                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00);
979                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00);
980                 }
981
982                 if (bus->noMemRanges) {
983                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0x0000 | bus->rangeMem->start >> 16);
984                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000 | bus->rangeMem->end >> 16);
985
986                         /* ____________________This is for debugging purposes only ________________________
987                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, &temp);
988                         debug ("mem_base = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
989                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, &temp);
990                         debug ("mem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
991                          __________________________________________________________________________________*/
992
993                 } else {
994                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0xffff);
995                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000);
996                 }
997                 if (bus->noPFMemRanges) {
998                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0x0000 | bus->rangePFMem->start >> 16);
999                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000 | bus->rangePFMem->end >> 16);
1000
1001                         /* __________________________This is for debugging purposes only _______________________
1002                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &temp);
1003                         debug ("pfmem_base = %x", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
1004                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &temp);
1005                         debug ("pfmem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
1006                          ______________________________________________________________________________________*/
1007
1008                         if (need_pfmem_upper) { /* since can't support n.e.ways */
1009                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, PCI_PREF_BASE_UPPER32, 0x00000000);
1010                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, PCI_PREF_LIMIT_UPPER32, 0x00000000);
1011                         }
1012                 } else {
1013                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0xffff);
1014                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000);
1015                 }
1016
1017                 debug ("b4 writing control information\n");
1018
1019                 pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
1020                 if ((irq > 0x00) && (irq < 0x05))
1021                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
1022                 /*
1023                 pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, ctrl);
1024                 pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_PARITY);
1025                 pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_SERR);
1026                  */
1027
1028                 pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
1029                 pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, 0x07);
1030                 for (i = 0; i < 32; i++) {
1031                         if (amount_needed->devices[i]) {
1032                                 debug ("device where devices[i] is 1 = %x\n", i);
1033                                 func->devices[i] = 1;
1034                         }
1035                 }
1036                 func->bus = 1;  /* For unconfiguring, to indicate it's PPB */
1037                 func_passed = &func;
1038                 debug ("func->busno b4 returning is %x\n", func->busno);
1039                 debug ("func->busno b4 returning in the other structure is %x\n", (*func_passed)->busno);
1040                 kfree (amount_needed);
1041                 return 0;
1042         } else {
1043                 err ("Configuring bridge was unsuccessful...\n");
1044                 mem_tmp = NULL;
1045                 retval = -EIO;
1046                 goto error;
1047         }
1048
1049 error:
1050         kfree(amount_needed);
1051         if (pfmem)
1052                 ibmphp_remove_resource (pfmem);
1053         if (io)
1054                 ibmphp_remove_resource (io);
1055         if (mem)
1056                 ibmphp_remove_resource (mem);
1057         for (i = 0; i < 2; i++) {       /* for 2 BARs */
1058                 if (bus_io[i]) {
1059                         ibmphp_remove_resource (bus_io[i]);
1060                         func->io[i] = NULL;
1061                 } else if (bus_pfmem[i]) {
1062                         ibmphp_remove_resource (bus_pfmem[i]);
1063                         func->pfmem[i] = NULL;
1064                 } else if (bus_mem[i]) {
1065                         ibmphp_remove_resource (bus_mem[i]);
1066                         func->mem[i] = NULL;
1067                 }
1068         }
1069         return retval;
1070 }
1071
1072 /*****************************************************************************
1073  * This function adds up the amount of resources needed behind the PPB bridge
1074  * and passes it to the configure_bridge function
1075  * Input: bridge function
1076  * Output: amount of resources needed
1077  *****************************************************************************/
1078 static struct res_needed *scan_behind_bridge (struct pci_func *func, u8 busno)
1079 {
1080         int count, len[6];
1081         u16 vendor_id;
1082         u8 hdr_type;
1083         u8 device, function;
1084         unsigned int devfn;
1085         int howmany = 0;        /*this is to see if there are any devices behind the bridge */
1086
1087         u32 bar[6], class;
1088         u32 address[] = {
1089                 PCI_BASE_ADDRESS_0,
1090                 PCI_BASE_ADDRESS_1,
1091                 PCI_BASE_ADDRESS_2,
1092                 PCI_BASE_ADDRESS_3,
1093                 PCI_BASE_ADDRESS_4,
1094                 PCI_BASE_ADDRESS_5,
1095                 0
1096         };
1097         struct res_needed *amount;
1098
1099         amount = kzalloc(sizeof(*amount), GFP_KERNEL);
1100         if (amount == NULL)
1101                 return NULL;
1102
1103         ibmphp_pci_bus->number = busno;
1104
1105         debug ("the bus_no behind the bridge is %x\n", busno);
1106         debug ("scanning devices behind the bridge...\n");
1107         for (device = 0; device < 32; device++) {
1108                 amount->devices[device] = 0;
1109                 for (function = 0; function < 8; function++) {
1110                         devfn = PCI_DEVFN(device, function);
1111
1112                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
1113
1114                         if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
1115                                 /* found correct device!!! */
1116                                 howmany++;
1117
1118                                 pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
1119                                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
1120
1121                                 debug ("hdr_type behind the bridge is %x\n", hdr_type);
1122                                 if (hdr_type & PCI_HEADER_TYPE_BRIDGE) {
1123                                         err ("embedded bridges not supported for hot-plugging.\n");
1124                                         amount->not_correct = 1;
1125                                         return amount;
1126                                 }
1127
1128                                 class >>= 8;    /* to take revision out, class = class.subclass.prog i/f */
1129                                 if (class == PCI_CLASS_NOT_DEFINED_VGA) {
1130                                         err ("The device %x is VGA compatible and as is not supported for hot plugging.  Please choose another device.\n", device);
1131                                         amount->not_correct = 1;
1132                                         return amount;
1133                                 } else if (class == PCI_CLASS_DISPLAY_VGA) {
1134                                         err ("The device %x is not supported for hot plugging.  Please choose another device.\n", device);
1135                                         amount->not_correct = 1;
1136                                         return amount;
1137                                 }
1138
1139                                 amount->devices[device] = 1;
1140
1141                                 for (count = 0; address[count]; count++) {
1142                                         /* for 6 BARs */
1143                                         /*
1144                                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, address[count], &tmp);
1145                                         if (tmp & 0x01) // IO
1146                                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFD);
1147                                         else // MEMORY
1148                                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
1149                                         */
1150                                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
1151                                         pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
1152
1153                                         debug ("what is bar[count]? %x, count = %d\n", bar[count], count);
1154
1155                                         if (!bar[count])        /* This BAR is not implemented */
1156                                                 continue;
1157
1158                                         //tmp_bar = bar[count];
1159
1160                                         debug ("count %d device %x function %x wants %x resources\n", count, device, function, bar[count]);
1161
1162                                         if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
1163                                                 /* This is IO */
1164                                                 len[count] = bar[count] & 0xFFFFFFFC;
1165                                                 len[count] = ~len[count] + 1;
1166                                                 amount->io += len[count];
1167                                         } else {
1168                                                 /* This is Memory */
1169                                                 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
1170                                                         /* pfmem */
1171                                                         len[count] = bar[count] & 0xFFFFFFF0;
1172                                                         len[count] = ~len[count] + 1;
1173                                                         amount->pfmem += len[count];
1174                                                         if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64)
1175                                                                 /* takes up another dword */
1176                                                                 count += 1;
1177
1178                                                 } else {
1179                                                         /* regular memory */
1180                                                         len[count] = bar[count] & 0xFFFFFFF0;
1181                                                         len[count] = ~len[count] + 1;
1182                                                         amount->mem += len[count];
1183                                                         if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
1184                                                                 /* takes up another dword */
1185                                                                 count += 1;
1186                                                         }
1187                                                 }
1188                                         }
1189                                 }       /* end for */
1190                         }       /* end if (valid) */
1191                 }       /* end for */
1192         }       /* end for */
1193
1194         if (!howmany)
1195                 amount->not_correct = 1;
1196         else
1197                 amount->not_correct = 0;
1198         if ((amount->io) && (amount->io < IOBRIDGE))
1199                 amount->io = IOBRIDGE;
1200         if ((amount->mem) && (amount->mem < MEMBRIDGE))
1201                 amount->mem = MEMBRIDGE;
1202         if ((amount->pfmem) && (amount->pfmem < MEMBRIDGE))
1203                 amount->pfmem = MEMBRIDGE;
1204         return amount;
1205 }
1206
1207 /* The following 3 unconfigure_boot_ routines deal with the case when we had the card
1208  * upon bootup in the system, since we don't allocate func to such case, we need to read
1209  * the start addresses from pci config space and then find the corresponding entries in
1210  * our resource lists.  The functions return either 0, -ENODEV, or -1 (general failure)
1211  * Change: we also call these functions even if we configured the card ourselves (i.e., not
1212  * the bootup case), since it should work same way
1213  */
1214 static int unconfigure_boot_device (u8 busno, u8 device, u8 function)
1215 {
1216         u32 start_address;
1217         u32 address[] = {
1218                 PCI_BASE_ADDRESS_0,
1219                 PCI_BASE_ADDRESS_1,
1220                 PCI_BASE_ADDRESS_2,
1221                 PCI_BASE_ADDRESS_3,
1222                 PCI_BASE_ADDRESS_4,
1223                 PCI_BASE_ADDRESS_5,
1224                 0
1225         };
1226         int count;
1227         struct resource_node *io;
1228         struct resource_node *mem;
1229         struct resource_node *pfmem;
1230         struct bus_node *bus;
1231         u32 end_address;
1232         u32 temp_end;
1233         u32 size;
1234         u32 tmp_address;
1235         unsigned int devfn;
1236
1237         debug ("%s - enter\n", __func__);
1238
1239         bus = ibmphp_find_res_bus (busno);
1240         if (!bus) {
1241                 debug ("cannot find corresponding bus.\n");
1242                 return -EINVAL;
1243         }
1244
1245         devfn = PCI_DEVFN(device, function);
1246         ibmphp_pci_bus->number = busno;
1247         for (count = 0; address[count]; count++) {      /* for 6 BARs */
1248                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &start_address);
1249
1250                 /* We can do this here, b/c by that time the device driver of the card has been stopped */
1251
1252                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
1253                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &size);
1254                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], start_address);
1255
1256                 debug ("start_address is %x\n", start_address);
1257                 debug ("busno, device, function %x %x %x\n", busno, device, function);
1258                 if (!size) {
1259                         /* This BAR is not implemented */
1260                         debug ("is this bar no implemented?, count = %d\n", count);
1261                         continue;
1262                 }
1263                 tmp_address = start_address;
1264                 if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
1265                         /* This is IO */
1266                         start_address &= PCI_BASE_ADDRESS_IO_MASK;
1267                         size = size & 0xFFFFFFFC;
1268                         size = ~size + 1;
1269                         end_address = start_address + size - 1;
1270                         if (ibmphp_find_resource (bus, start_address, &io, IO) < 0) {
1271                                 err ("cannot find corresponding IO resource to remove\n");
1272                                 return -EIO;
1273                         }
1274                         debug ("io->start = %x\n", io->start);
1275                         temp_end = io->end;
1276                         start_address = io->end + 1;
1277                         ibmphp_remove_resource (io);
1278                         /* This is needed b/c of the old I/O restrictions in the BIOS */
1279                         while (temp_end < end_address) {
1280                                 if (ibmphp_find_resource (bus, start_address, &io, IO) < 0) {
1281                                         err ("cannot find corresponding IO resource to remove\n");
1282                                         return -EIO;
1283                                 }
1284                                 debug ("io->start = %x\n", io->start);
1285                                 temp_end = io->end;
1286                                 start_address = io->end + 1;
1287                                 ibmphp_remove_resource (io);
1288                         }
1289
1290                         /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
1291                 } else {
1292                         /* This is Memory */
1293                         if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
1294                                 /* pfmem */
1295                                 debug ("start address of pfmem is %x\n", start_address);
1296                                 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1297
1298                                 if (ibmphp_find_resource (bus, start_address, &pfmem, PFMEM) < 0) {
1299                                         err ("cannot find corresponding PFMEM resource to remove\n");
1300                                         return -EIO;
1301                                 }
1302                                 if (pfmem) {
1303                                         debug ("pfmem->start = %x\n", pfmem->start);
1304
1305                                         ibmphp_remove_resource(pfmem);
1306                                 }
1307                         } else {
1308                                 /* regular memory */
1309                                 debug ("start address of mem is %x\n", start_address);
1310                                 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1311
1312                                 if (ibmphp_find_resource (bus, start_address, &mem, MEM) < 0) {
1313                                         err ("cannot find corresponding MEM resource to remove\n");
1314                                         return -EIO;
1315                                 }
1316                                 if (mem) {
1317                                         debug ("mem->start = %x\n", mem->start);
1318
1319                                         ibmphp_remove_resource(mem);
1320                                 }
1321                         }
1322                         if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
1323                                 /* takes up another dword */
1324                                 count += 1;
1325                         }
1326                 }       /* end of mem */
1327         }       /* end of for */
1328
1329         return 0;
1330 }
1331
1332 static int unconfigure_boot_bridge (u8 busno, u8 device, u8 function)
1333 {
1334         int count;
1335         int bus_no, pri_no, sub_no, sec_no = 0;
1336         u32 start_address, tmp_address;
1337         u8 sec_number, sub_number, pri_number;
1338         struct resource_node *io = NULL;
1339         struct resource_node *mem = NULL;
1340         struct resource_node *pfmem = NULL;
1341         struct bus_node *bus;
1342         u32 address[] = {
1343                 PCI_BASE_ADDRESS_0,
1344                 PCI_BASE_ADDRESS_1,
1345                 0
1346         };
1347         unsigned int devfn;
1348
1349         devfn = PCI_DEVFN(device, function);
1350         ibmphp_pci_bus->number = busno;
1351         bus_no = (int) busno;
1352         debug ("busno is %x\n", busno);
1353         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);
1354         debug ("%s - busno = %x, primary_number = %x\n", __func__, busno, pri_number);
1355
1356         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
1357         debug ("sec_number is %x\n", sec_number);
1358         sec_no = (int) sec_number;
1359         pri_no = (int) pri_number;
1360         if (pri_no != bus_no) {
1361                 err ("primary numbers in our structures and pci config space don't match.\n");
1362                 return -EINVAL;
1363         }
1364
1365         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sub_number);
1366         sub_no = (int) sub_number;
1367         debug ("sub_no is %d, sec_no is %d\n", sub_no, sec_no);
1368         if (sec_no != sub_number) {
1369                 err ("there're more buses behind this bridge.  Hot removal is not supported.  Please choose another card\n");
1370                 return -ENODEV;
1371         }
1372
1373         bus = ibmphp_find_res_bus (sec_number);
1374         if (!bus) {
1375                 err ("cannot find Bus structure for the bridged device\n");
1376                 return -EINVAL;
1377         }
1378         debug("bus->busno is %x\n", bus->busno);
1379         debug("sec_number is %x\n", sec_number);
1380
1381         ibmphp_remove_bus (bus, busno);
1382
1383         for (count = 0; address[count]; count++) {
1384                 /* for 2 BARs */
1385                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &start_address);
1386
1387                 if (!start_address) {
1388                         /* This BAR is not implemented */
1389                         continue;
1390                 }
1391
1392                 tmp_address = start_address;
1393
1394                 if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
1395                         /* This is IO */
1396                         start_address &= PCI_BASE_ADDRESS_IO_MASK;
1397                         if (ibmphp_find_resource (bus, start_address, &io, IO) < 0) {
1398                                 err ("cannot find corresponding IO resource to remove\n");
1399                                 return -EIO;
1400                         }
1401                         if (io)
1402                                 debug ("io->start = %x\n", io->start);
1403
1404                         ibmphp_remove_resource (io);
1405
1406                         /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
1407                 } else {
1408                         /* This is Memory */
1409                         if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
1410                                 /* pfmem */
1411                                 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1412                                 if (ibmphp_find_resource (bus, start_address, &pfmem, PFMEM) < 0) {
1413                                         err ("cannot find corresponding PFMEM resource to remove\n");
1414                                         return -EINVAL;
1415                                 }
1416                                 if (pfmem) {
1417                                         debug ("pfmem->start = %x\n", pfmem->start);
1418
1419                                         ibmphp_remove_resource(pfmem);
1420                                 }
1421                         } else {
1422                                 /* regular memory */
1423                                 start_address &= PCI_BASE_ADDRESS_MEM_MASK;
1424                                 if (ibmphp_find_resource (bus, start_address, &mem, MEM) < 0) {
1425                                         err ("cannot find corresponding MEM resource to remove\n");
1426                                         return -EINVAL;
1427                                 }
1428                                 if (mem) {
1429                                         debug ("mem->start = %x\n", mem->start);
1430
1431                                         ibmphp_remove_resource(mem);
1432                                 }
1433                         }
1434                         if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
1435                                 /* takes up another dword */
1436                                 count += 1;
1437                         }
1438                 }       /* end of mem */
1439         }       /* end of for */
1440         debug ("%s - exiting, returning success\n", __func__);
1441         return 0;
1442 }
1443
1444 static int unconfigure_boot_card (struct slot *slot_cur)
1445 {
1446         u16 vendor_id;
1447         u32 class;
1448         u8 hdr_type;
1449         u8 device;
1450         u8 busno;
1451         u8 function;
1452         int rc;
1453         unsigned int devfn;
1454         u8 valid_device = 0x00; /* To see if we are ever able to find valid device and read it */
1455
1456         debug ("%s - enter\n", __func__);
1457
1458         device = slot_cur->device;
1459         busno = slot_cur->bus;
1460
1461         debug ("b4 for loop, device is %x\n", device);
1462         /* For every function on the card */
1463         for (function = 0x0; function < 0x08; function++) {
1464                 devfn = PCI_DEVFN(device, function);
1465                 ibmphp_pci_bus->number = busno;
1466
1467                 pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
1468
1469                 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
1470                         /* found correct device!!! */
1471                         ++valid_device;
1472
1473                         debug ("%s - found correct device\n", __func__);
1474
1475                         /* header: x x x x x x x x
1476                          *         | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge
1477                          *         |_=> 0 = single function device, 1 = multi-function device
1478                          */
1479
1480                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
1481                         pci_bus_read_config_dword (ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
1482
1483                         debug ("hdr_type %x, class %x\n", hdr_type, class);
1484                         class >>= 8;    /* to take revision out, class = class.subclass.prog i/f */
1485                         if (class == PCI_CLASS_NOT_DEFINED_VGA) {
1486                                 err ("The device %x function %x is VGA compatible and is not supported for hot removing.  Please choose another device.\n", device, function);
1487                                 return -ENODEV;
1488                         } else if (class == PCI_CLASS_DISPLAY_VGA) {
1489                                 err ("The device %x function %x is not supported for hot removing.  Please choose another device.\n", device, function);
1490                                 return -ENODEV;
1491                         }
1492
1493                         switch (hdr_type) {
1494                                 case PCI_HEADER_TYPE_NORMAL:
1495                                         rc = unconfigure_boot_device (busno, device, function);
1496                                         if (rc) {
1497                                                 err ("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
1498                                                      device, function, busno);
1499                                                 return rc;
1500                                         }
1501                                         function = 0x8;
1502                                         break;
1503                                 case PCI_HEADER_TYPE_MULTIDEVICE:
1504                                         rc = unconfigure_boot_device (busno, device, function);
1505                                         if (rc) {
1506                                                 err ("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
1507                                                      device, function, busno);
1508                                                 return rc;
1509                                         }
1510                                         break;
1511                                 case PCI_HEADER_TYPE_BRIDGE:
1512                                         class >>= 8;
1513                                         if (class != PCI_CLASS_BRIDGE_PCI) {
1514                                                 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);
1515                                                 return -ENODEV;
1516                                         }
1517                                         rc = unconfigure_boot_bridge (busno, device, function);
1518                                         if (rc != 0) {
1519                                                 err ("was not able to hot-remove PPB properly.\n");
1520                                                 return rc;
1521                                         }
1522
1523                                         function = 0x8;
1524                                         break;
1525                                 case PCI_HEADER_TYPE_MULTIBRIDGE:
1526                                         class >>= 8;
1527                                         if (class != PCI_CLASS_BRIDGE_PCI) {
1528                                                 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);
1529                                                 return -ENODEV;
1530                                         }
1531                                         rc = unconfigure_boot_bridge (busno, device, function);
1532                                         if (rc != 0) {
1533                                                 err ("was not able to hot-remove PPB properly.\n");
1534                                                 return rc;
1535                                         }
1536                                         break;
1537                                 default:
1538                                         err ("MAJOR PROBLEM!!!! Cannot read device's header\n");
1539                                         return -1;
1540                                         break;
1541                         }       /* end of switch */
1542                 }       /* end of valid device */
1543         }       /* end of for */
1544
1545         if (!valid_device) {
1546                 err ("Could not find device to unconfigure.  Or could not read the card.\n");
1547                 return -1;
1548         }
1549         return 0;
1550 }
1551
1552 /*
1553  * free the resources of the card (multi, single, or bridged)
1554  * Parameters: slot, flag to say if this is for removing entire module or just
1555  * unconfiguring the device
1556  * TO DO:  will probably need to add some code in case there was some resource,
1557  * to remove it... this is from when we have errors in the configure_card...
1558  *                      !!!!!!!!!!!!!!!!!!!!!!!!!FOR BUSES!!!!!!!!!!!!
1559  * Returns: 0, -1, -ENODEV
1560  */
1561 int ibmphp_unconfigure_card (struct slot **slot_cur, int the_end)
1562 {
1563         int i;
1564         int count;
1565         int rc;
1566         struct slot *sl = *slot_cur;
1567         struct pci_func *cur_func = NULL;
1568         struct pci_func *temp_func;
1569
1570         debug ("%s - enter\n", __func__);
1571
1572         if (!the_end) {
1573                 /* Need to unconfigure the card */
1574                 rc = unconfigure_boot_card (sl);
1575                 if ((rc == -ENODEV) || (rc == -EIO) || (rc == -EINVAL)) {
1576                         /* In all other cases, will still need to get rid of func structure if it exists */
1577                         return rc;
1578                 }
1579         }
1580
1581         if (sl->func) {
1582                 cur_func = sl->func;
1583                 while (cur_func) {
1584                         /* TO DO: WILL MOST LIKELY NEED TO GET RID OF THE BUS STRUCTURE FROM RESOURCES AS WELL */
1585                         if (cur_func->bus) {
1586                                 /* in other words, it's a PPB */
1587                                 count = 2;
1588                         } else {
1589                                 count = 6;
1590                         }
1591
1592                         for (i = 0; i < count; i++) {
1593                                 if (cur_func->io[i]) {
1594                                         debug ("io[%d] exists\n", i);
1595                                         if (the_end > 0)
1596                                                 ibmphp_remove_resource (cur_func->io[i]);
1597                                         cur_func->io[i] = NULL;
1598                                 }
1599                                 if (cur_func->mem[i]) {
1600                                         debug ("mem[%d] exists\n", i);
1601                                         if (the_end > 0)
1602                                                 ibmphp_remove_resource (cur_func->mem[i]);
1603                                         cur_func->mem[i] = NULL;
1604                                 }
1605                                 if (cur_func->pfmem[i]) {
1606                                         debug ("pfmem[%d] exists\n", i);
1607                                         if (the_end > 0)
1608                                                 ibmphp_remove_resource (cur_func->pfmem[i]);
1609                                         cur_func->pfmem[i] = NULL;
1610                                 }
1611                         }
1612
1613                         temp_func = cur_func->next;
1614                         kfree (cur_func);
1615                         cur_func = temp_func;
1616                 }
1617         }
1618
1619         sl->func = NULL;
1620         *slot_cur = sl;
1621         debug ("%s - exit\n", __func__);
1622         return 0;
1623 }
1624
1625 /*
1626  * add a new bus resulting from hot-plugging a PPB bridge with devices
1627  *
1628  * Input: bus and the amount of resources needed (we know we can assign those,
1629  *        since they've been checked already
1630  * Output: bus added to the correct spot
1631  *         0, -1, error
1632  */
1633 static int add_new_bus (struct bus_node *bus, struct resource_node *io, struct resource_node *mem, struct resource_node *pfmem, u8 parent_busno)
1634 {
1635         struct range_node *io_range = NULL;
1636         struct range_node *mem_range = NULL;
1637         struct range_node *pfmem_range = NULL;
1638         struct bus_node *cur_bus = NULL;
1639
1640         /* Trying to find the parent bus number */
1641         if (parent_busno != 0xFF) {
1642                 cur_bus = ibmphp_find_res_bus (parent_busno);
1643                 if (!cur_bus) {
1644                         err ("strange, cannot find bus which is supposed to be at the system... something is terribly wrong...\n");
1645                         return -ENODEV;
1646                 }
1647
1648                 list_add (&bus->bus_list, &cur_bus->bus_list);
1649         }
1650         if (io) {
1651                 io_range = kzalloc(sizeof(*io_range), GFP_KERNEL);
1652                 if (!io_range) {
1653                         err ("out of system memory\n");
1654                         return -ENOMEM;
1655                 }
1656                 io_range->start = io->start;
1657                 io_range->end = io->end;
1658                 io_range->rangeno = 1;
1659                 bus->noIORanges = 1;
1660                 bus->rangeIO = io_range;
1661         }
1662         if (mem) {
1663                 mem_range = kzalloc(sizeof(*mem_range), GFP_KERNEL);
1664                 if (!mem_range) {
1665                         err ("out of system memory\n");
1666                         return -ENOMEM;
1667                 }
1668                 mem_range->start = mem->start;
1669                 mem_range->end = mem->end;
1670                 mem_range->rangeno = 1;
1671                 bus->noMemRanges = 1;
1672                 bus->rangeMem = mem_range;
1673         }
1674         if (pfmem) {
1675                 pfmem_range = kzalloc(sizeof(*pfmem_range), GFP_KERNEL);
1676                 if (!pfmem_range) {
1677                         err ("out of system memory\n");
1678                         return -ENOMEM;
1679                 }
1680                 pfmem_range->start = pfmem->start;
1681                 pfmem_range->end = pfmem->end;
1682                 pfmem_range->rangeno = 1;
1683                 bus->noPFMemRanges = 1;
1684                 bus->rangePFMem = pfmem_range;
1685         }
1686         return 0;
1687 }
1688
1689 /*
1690  * find the 1st available bus number for PPB to set as its secondary bus
1691  * Parameters: bus_number of the primary bus
1692  * Returns: bus_number of the secondary bus or 0xff in case of failure
1693  */
1694 static u8 find_sec_number (u8 primary_busno, u8 slotno)
1695 {
1696         int min, max;
1697         u8 busno;
1698         struct bus_info *bus;
1699         struct bus_node *bus_cur;
1700
1701         bus = ibmphp_find_same_bus_num (primary_busno);
1702         if (!bus) {
1703                 err ("cannot get slot range of the bus from the BIOS\n");
1704                 return 0xff;
1705         }
1706         max = bus->slot_max;
1707         min = bus->slot_min;
1708         if ((slotno > max) || (slotno < min)) {
1709                 err ("got the wrong range\n");
1710                 return 0xff;
1711         }
1712         busno = (u8) (slotno - (u8) min);
1713         busno += primary_busno + 0x01;
1714         bus_cur = ibmphp_find_res_bus (busno);
1715         /* either there is no such bus number, or there are no ranges, which
1716          * can only happen if we removed the bridged device in previous load
1717          * of the driver, and now only have the skeleton bus struct
1718          */
1719         if ((!bus_cur) || (!(bus_cur->rangeIO) && !(bus_cur->rangeMem) && !(bus_cur->rangePFMem)))
1720                 return busno;
1721         return 0xff;
1722 }