PCI: drivers/pci/slot.c should depend on CONFIG_SYSFS
[linux-2.6.git] / 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->funcion = %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. "
141                                      "Please choose another device.\n", 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                                         if ((rc = configure_device (cur_func)) < 0) {
149                                                 /* We need to do this in case some other BARs were properly inserted */
150                                                 err ("was not able to configure devfunc %x on bus %x.\n",
151                                                      cur_func->device, cur_func->busno);
152                                                 cleanup_count = 6;
153                                                 goto error;
154                                         }       
155                                         cur_func->next = NULL;
156                                         function = 0x8;
157                                         break;
158                                 case PCI_HEADER_TYPE_MULTIDEVICE:
159                                         assign_alt_irq (cur_func, class_code);
160                                         if ((rc = configure_device (cur_func)) < 0) {
161                                                 /* We need to do this in case some other BARs were properly inserted */
162                                                 err ("was not able to configure devfunc %x on bus %x...bailing out\n",
163                                                      cur_func->device, cur_func->busno);
164                                                 cleanup_count = 6;
165                                                 goto error;
166                                         }
167                                         newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
168                                         if (!newfunc) {
169                                                 err ("out of system memory\n");
170                                                 return -ENOMEM;
171                                         }
172                                         newfunc->busno = cur_func->busno;
173                                         newfunc->device = device;
174                                         cur_func->next = newfunc;
175                                         cur_func = newfunc;
176                                         for (j = 0; j < 4; j++)
177                                                 newfunc->irq[j] = cur_func->irq[j];
178                                         break;
179                                 case PCI_HEADER_TYPE_MULTIBRIDGE:
180                                         class >>= 8;
181                                         if (class != PCI_CLASS_BRIDGE_PCI) {
182                                                 err ("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. "
183                                                      "Please insert another card.\n", cur_func->device);
184                                                 return -ENODEV;
185                                         }
186                                         assign_alt_irq (cur_func, class_code);
187                                         rc = configure_bridge (&cur_func, slotno);
188                                         if (rc == -ENODEV) {
189                                                 err ("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
190                                                 err ("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);
191                                                 return rc;
192                                         }
193                                         if (rc) {
194                                                 /* We need to do this in case some other BARs were properly inserted */
195                                                 err ("was not able to hot-add PPB properly.\n");
196                                                 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
197                                                 cleanup_count = 2;
198                                                 goto error;
199                                         }
200
201                                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
202                                         flag = 0;
203                                         for (i = 0; i < 32; i++) {
204                                                 if (func->devices[i]) {
205                                                         newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
206                                                         if (!newfunc) {
207                                                                 err ("out of system memory\n");
208                                                                 return -ENOMEM;
209                                                         }
210                                                         newfunc->busno = sec_number;
211                                                         newfunc->device = (u8) i;
212                                                         for (j = 0; j < 4; j++)
213                                                                 newfunc->irq[j] = cur_func->irq[j];
214
215                                                         if (flag) {
216                                                                 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
217                                                                 prev_func->next = newfunc;
218                                                         } else
219                                                                 cur_func->next = newfunc;
220
221                                                         rc = ibmphp_configure_card (newfunc, slotno);
222                                                         /* This could only happen if kmalloc failed */
223                                                         if (rc) {
224                                                                 /* We need to do this in case bridge itself got configured properly, but devices behind it failed */
225                                                                 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
226                                                                 cleanup_count = 2;
227                                                                 goto error;
228                                                         }
229                                                         flag = 1;
230                                                 }
231                                         }
232
233                                         newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
234                                         if (!newfunc) {
235                                                 err ("out of system memory\n");
236                                                 return -ENOMEM;
237                                         }
238                                         newfunc->busno = cur_func->busno;
239                                         newfunc->device = device;
240                                         for (j = 0; j < 4; j++)
241                                                 newfunc->irq[j] = cur_func->irq[j];
242                                         for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
243                                         prev_func->next = newfunc;
244                                         cur_func = newfunc;
245                                         break;
246                                 case PCI_HEADER_TYPE_BRIDGE:
247                                         class >>= 8;
248                                         debug ("class now is %x\n", class);
249                                         if (class != PCI_CLASS_BRIDGE_PCI) {
250                                                 err ("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. "
251                                                      "Please insert another card.\n", cur_func->device);
252                                                 return -ENODEV;
253                                         }
254
255                                         assign_alt_irq (cur_func, class_code);
256
257                                         debug ("cur_func->busno b4 configure_bridge is %x\n", cur_func->busno);
258                                         rc = configure_bridge (&cur_func, slotno);
259                                         if (rc == -ENODEV) {
260                                                 err ("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
261                                                 err ("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);
262                                                 return rc;
263                                         }
264                                         if (rc) {
265                                                 /* We need to do this in case some other BARs were properly inserted */
266                                                 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
267                                                 err ("was not able to hot-add PPB properly.\n");
268                                                 cleanup_count = 2;
269                                                 goto error;
270                                         }
271                                         debug ("cur_func->busno = %x, device = %x, function = %x\n",
272                                                 cur_func->busno, device, function);
273                                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
274                                         debug ("after configuring bridge..., sec_number = %x\n", sec_number);
275                                         flag = 0;
276                                         for (i = 0; i < 32; i++) {
277                                                 if (func->devices[i]) {
278                                                         debug ("inside for loop, device is %x\n", i);
279                                                         newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
280                                                         if (!newfunc) {
281                                                                 err (" out of system memory\n");
282                                                                 return -ENOMEM;
283                                                         }
284                                                         newfunc->busno = sec_number;
285                                                         newfunc->device = (u8) i;
286                                                         for (j = 0; j < 4; j++)
287                                                                 newfunc->irq[j] = cur_func->irq[j];
288
289                                                         if (flag) {
290                                                                 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
291                                                                 prev_func->next = newfunc;
292                                                         } else
293                                                                 cur_func->next = newfunc;
294
295                                                         rc = ibmphp_configure_card (newfunc, slotno);
296
297                                                         /* Again, this case should not happen... For complete paranoia, will need to call remove_bus */
298                                                         if (rc) {
299                                                                 /* We need to do this in case some other BARs were properly inserted */
300                                                                 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
301                                                                 cleanup_count = 2;
302                                                                 goto error;
303                                                         }
304                                                         flag = 1;
305                                                 }
306                                         }
307
308                                         function = 0x8;
309                                         break;
310                                 default:
311                                         err ("MAJOR PROBLEM!!!!, header type not supported? %x\n", hdr_type);
312                                         return -ENXIO;
313                                         break;
314                         }       /* end of switch */
315                 }       /* end of valid device */
316         }       /* end of for */
317
318         if (!valid_device) {
319                 err ("Cannot find any valid devices on the card.  Or unable to read from card.\n");
320                 return -ENODEV;
321         }
322
323         return 0;
324
325 error:
326         for (i = 0; i < cleanup_count; i++) {
327                 if (cur_func->io[i]) {
328                         ibmphp_remove_resource (cur_func->io[i]);
329                         cur_func->io[i] = NULL;
330                 } else if (cur_func->pfmem[i]) {
331                         ibmphp_remove_resource (cur_func->pfmem[i]);
332                         cur_func->pfmem[i] = NULL;
333                 } else if (cur_func->mem[i]) {
334                         ibmphp_remove_resource (cur_func->mem[i]);
335                         cur_func->mem[i] = NULL;
336                 }
337         }
338         return rc;
339 }
340
341 /*
342  * This function configures the pci BARs of a single device.  
343  * Input: pointer to the pci_func
344  * Output: configured PCI, 0, or error
345  */
346 static int configure_device (struct pci_func *func)
347 {
348         u32 bar[6];
349         u32 address[] = {
350                 PCI_BASE_ADDRESS_0,
351                 PCI_BASE_ADDRESS_1,
352                 PCI_BASE_ADDRESS_2,
353                 PCI_BASE_ADDRESS_3,
354                 PCI_BASE_ADDRESS_4,
355                 PCI_BASE_ADDRESS_5,
356                 0
357         };
358         u8 irq;
359         int count;
360         int len[6];
361         struct resource_node *io[6];
362         struct resource_node *mem[6];
363         struct resource_node *mem_tmp;
364         struct resource_node *pfmem[6];
365         unsigned int devfn;
366
367         debug ("%s - inside\n", __func__);
368
369         devfn = PCI_DEVFN(func->device, func->function);
370         ibmphp_pci_bus->number = func->busno;
371
372         for (count = 0; address[count]; count++) {      /* for 6 BARs */
373
374                 /* not sure if i need this.  per scott, said maybe need smth like this
375                    if devices don't adhere 100% to the spec, so don't want to write
376                    to the reserved bits
377
378                 pcibios_read_config_byte(cur_func->busno, cur_func->device, 
379                 PCI_BASE_ADDRESS_0 + 4 * count, &tmp);
380                 if (tmp & 0x01) // IO
381                         pcibios_write_config_dword(cur_func->busno, cur_func->device, 
382                         PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFD);
383                 else  // Memory
384                         pcibios_write_config_dword(cur_func->busno, cur_func->device, 
385                         PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFF);
386                  */
387                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
388                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
389
390                 if (!bar[count])        /* This BAR is not implemented */
391                         continue;
392
393                 debug ("Device %x BAR %d wants %x\n", func->device, count, bar[count]);
394
395                 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
396                         /* This is IO */
397                         debug ("inside IO SPACE\n");
398
399                         len[count] = bar[count] & 0xFFFFFFFC;
400                         len[count] = ~len[count] + 1;
401
402                         debug ("len[count] in IO %x, count %d\n", len[count], count);
403
404                         io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
405
406                         if (!io[count]) {
407                                 err ("out of system memory\n");
408                                 return -ENOMEM;
409                         }
410                         io[count]->type = IO;
411                         io[count]->busno = func->busno;
412                         io[count]->devfunc = PCI_DEVFN(func->device, func->function);
413                         io[count]->len = len[count];
414                         if (ibmphp_check_resource(io[count], 0) == 0) {
415                                 ibmphp_add_resource (io[count]);
416                                 func->io[count] = io[count];
417                         } else {
418                                 err ("cannot allocate requested io for bus %x device %x function %x len %x\n",
419                                      func->busno, func->device, func->function, len[count]);
420                                 kfree (io[count]);
421                                 return -EIO;
422                         }
423                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
424         
425                         /* _______________This is for debugging purposes only_____________________ */ 
426                         debug ("b4 writing, the IO address is %x\n", func->io[count]->start);
427                         pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
428                         debug ("after writing.... the start address is %x\n", bar[count]);
429                         /* _________________________________________________________________________*/
430
431                 } else {
432                         /* This is Memory */
433                         if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
434                                 /* pfmem */
435                                 debug ("PFMEM SPACE\n");
436
437                                 len[count] = bar[count] & 0xFFFFFFF0;
438                                 len[count] = ~len[count] + 1;
439
440                                 debug ("len[count] in PFMEM %x, count %d\n", len[count], count);
441
442                                 pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
443                                 if (!pfmem[count]) {
444                                         err ("out of system memory\n");
445                                         return -ENOMEM;
446                                 }
447                                 pfmem[count]->type = PFMEM;
448                                 pfmem[count]->busno = func->busno;
449                                 pfmem[count]->devfunc = PCI_DEVFN(func->device,
450                                                         func->function);
451                                 pfmem[count]->len = len[count];
452                                 pfmem[count]->fromMem = 0;
453                                 if (ibmphp_check_resource (pfmem[count], 0) == 0) {
454                                         ibmphp_add_resource (pfmem[count]);
455                                         func->pfmem[count] = pfmem[count];
456                                 } else {
457                                         mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
458                                         if (!mem_tmp) {
459                                                 err ("out of system memory\n");
460                                                 kfree (pfmem[count]);
461                                                 return -ENOMEM;
462                                         }
463                                         mem_tmp->type = MEM;
464                                         mem_tmp->busno = pfmem[count]->busno;
465                                         mem_tmp->devfunc = pfmem[count]->devfunc;
466                                         mem_tmp->len = pfmem[count]->len;
467                                         debug ("there's no pfmem... going into mem.\n");
468                                         if (ibmphp_check_resource (mem_tmp, 0) == 0) {
469                                                 ibmphp_add_resource (mem_tmp);
470                                                 pfmem[count]->fromMem = 1;
471                                                 pfmem[count]->rangeno = mem_tmp->rangeno;
472                                                 pfmem[count]->start = mem_tmp->start;
473                                                 pfmem[count]->end = mem_tmp->end;
474                                                 ibmphp_add_pfmem_from_mem (pfmem[count]);
475                                                 func->pfmem[count] = pfmem[count];
476                                         } else {
477                                                 err ("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
478                                                      func->busno, func->device, len[count]);
479                                                 kfree (mem_tmp);
480                                                 kfree (pfmem[count]);
481                                                 return -EIO;
482                                         }
483                                 }
484
485                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
486
487                                 /*_______________This is for debugging purposes only______________________________*/                            
488                                 debug ("b4 writing, start address is %x\n", func->pfmem[count]->start);
489                                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
490                                 debug ("after writing, start address is %x\n", bar[count]);
491                                 /*_________________________________________________________________________________*/
492
493                                 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {        /* takes up another dword */
494                                         debug ("inside the mem 64 case, count %d\n", count);
495                                         count += 1;
496                                         /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
497                                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0x00000000);
498                                 }
499                         } else {
500                                 /* regular memory */
501                                 debug ("REGULAR MEM SPACE\n");
502
503                                 len[count] = bar[count] & 0xFFFFFFF0;
504                                 len[count] = ~len[count] + 1;
505
506                                 debug ("len[count] in Mem %x, count %d\n", len[count], count);
507
508                                 mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
509                                 if (!mem[count]) {
510                                         err ("out of system memory\n");
511                                         return -ENOMEM;
512                                 }
513                                 mem[count]->type = MEM;
514                                 mem[count]->busno = func->busno;
515                                 mem[count]->devfunc = PCI_DEVFN(func->device,
516                                                         func->function);
517                                 mem[count]->len = len[count];
518                                 if (ibmphp_check_resource (mem[count], 0) == 0) {
519                                         ibmphp_add_resource (mem[count]);
520                                         func->mem[count] = mem[count];
521                                 } else {
522                                         err ("cannot allocate requested mem for bus %x, device %x, len %x\n",
523                                              func->busno, func->device, len[count]);
524                                         kfree (mem[count]);
525                                         return -EIO;
526                                 }
527                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
528                                 /* _______________________This is for debugging purposes only _______________________*/
529                                 debug ("b4 writing, start address is %x\n", func->mem[count]->start);
530                                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
531                                 debug ("after writing, the address is %x\n", bar[count]);
532                                 /* __________________________________________________________________________________*/
533
534                                 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
535                                         /* takes up another dword */
536                                         debug ("inside mem 64 case, reg. mem, count %d\n", count);
537                                         count += 1;
538                                         /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
539                                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0x00000000);
540                                 }
541                         }
542                 }               /* end of mem */
543         }                       /* end of for */
544
545         func->bus = 0;          /* To indicate that this is not a PPB */
546         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
547         if ((irq > 0x00) && (irq < 0x05))
548                 pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
549
550         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
551         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
552
553         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, PCI_ROM_ADDRESS, 0x00L);
554         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
555
556         return 0;
557 }
558
559 /******************************************************************************
560  * This routine configures a PCI-2-PCI bridge and the functions behind it
561  * Parameters: pci_func
562  * Returns: 
563  ******************************************************************************/
564 static int configure_bridge (struct pci_func **func_passed, u8 slotno)
565 {
566         int count;
567         int i;
568         int rc;
569         u8 sec_number;
570         u8 io_base;
571         u16 pfmem_base;
572         u32 bar[2];
573         u32 len[2];
574         u8 flag_io = 0;
575         u8 flag_mem = 0;
576         u8 flag_pfmem = 0;
577         u8 need_io_upper = 0;
578         u8 need_pfmem_upper = 0;
579         struct res_needed *amount_needed = NULL;
580         struct resource_node *io = NULL;
581         struct resource_node *bus_io[2] = {NULL, NULL};
582         struct resource_node *mem = NULL;
583         struct resource_node *bus_mem[2] = {NULL, NULL};
584         struct resource_node *mem_tmp = NULL;
585         struct resource_node *pfmem = NULL;
586         struct resource_node *bus_pfmem[2] = {NULL, NULL};
587         struct bus_node *bus;
588         u32 address[] = {
589                 PCI_BASE_ADDRESS_0,
590                 PCI_BASE_ADDRESS_1,
591                 0
592         };
593         struct pci_func *func = *func_passed;
594         unsigned int devfn;
595         u8 irq;
596         int retval;
597
598         debug ("%s - enter\n", __func__);
599
600         devfn = PCI_DEVFN(func->function, func->device);
601         ibmphp_pci_bus->number = func->busno;
602
603         /* Configuring necessary info for the bridge so that we could see the devices
604          * behind it
605          */
606
607         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, func->busno);
608
609         /* _____________________For debugging purposes only __________________________
610         pci_bus_config_byte (ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);
611         debug ("primary # written into the bridge is %x\n", pri_number);
612          ___________________________________________________________________________*/
613
614         /* in EBDA, only get allocated 1 additional bus # per slot */
615         sec_number = find_sec_number (func->busno, slotno);
616         if (sec_number == 0xff) {
617                 err ("cannot allocate secondary bus number for the bridged device\n");
618                 return -EINVAL;
619         }
620
621         debug ("after find_sec_number, the number we got is %x\n", sec_number);
622         debug ("AFTER FIND_SEC_NUMBER, func->busno IS %x\n", func->busno);
623
624         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, sec_number);
625         
626         /* __________________For debugging purposes only __________________________________
627         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
628         debug ("sec_number after write/read is %x\n", sec_number);
629          ________________________________________________________________________________*/
630
631         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, sec_number);
632
633         /* __________________For debugging purposes only ____________________________________
634         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sec_number);
635         debug ("subordinate number after write/read is %x\n", sec_number);
636          __________________________________________________________________________________*/
637
638         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
639         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
640         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_SEC_LATENCY_TIMER, LATENCY);
641
642         debug ("func->busno is %x\n", func->busno);
643         debug ("sec_number after writing is %x\n", sec_number);
644
645
646         /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
647            !!!!!!!!!!!!!!!NEED TO ADD!!!  FAST BACK-TO-BACK ENABLE!!!!!!!!!!!!!!!!!!!! 
648            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
649
650
651         /* First we need to allocate mem/io for the bridge itself in case it needs it */
652         for (count = 0; address[count]; count++) {      /* for 2 BARs */
653                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
654                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, address[count], &bar[count]);
655
656                 if (!bar[count]) {
657                         /* This BAR is not implemented */
658                         debug ("so we come here then, eh?, count = %d\n", count);
659                         continue;
660                 }
661                 //  tmp_bar = bar[count];
662
663                 debug ("Bar %d wants %x\n", count, bar[count]);
664
665                 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
666                         /* This is IO */
667                         len[count] = bar[count] & 0xFFFFFFFC;
668                         len[count] = ~len[count] + 1;
669
670                         debug ("len[count] in IO = %x\n", len[count]);
671
672                         bus_io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
673                 
674                         if (!bus_io[count]) {
675                                 err ("out of system memory\n");
676                                 retval = -ENOMEM;
677                                 goto error;
678                         }
679                         bus_io[count]->type = IO;
680                         bus_io[count]->busno = func->busno;
681                         bus_io[count]->devfunc = PCI_DEVFN(func->device,
682                                                         func->function);
683                         bus_io[count]->len = len[count];
684                         if (ibmphp_check_resource (bus_io[count], 0) == 0) {
685                                 ibmphp_add_resource (bus_io[count]);
686                                 func->io[count] = bus_io[count];
687                         } else {
688                                 err ("cannot allocate requested io for bus %x, device %x, len %x\n",
689                                      func->busno, func->device, len[count]);
690                                 kfree (bus_io[count]);
691                                 return -EIO;
692                         }
693
694                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
695
696                 } else {
697                         /* This is Memory */
698                         if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
699                                 /* pfmem */
700                                 len[count] = bar[count] & 0xFFFFFFF0;
701                                 len[count] = ~len[count] + 1;
702
703                                 debug ("len[count] in PFMEM = %x\n", len[count]);
704
705                                 bus_pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
706                                 if (!bus_pfmem[count]) {
707                                         err ("out of system memory\n");
708                                         retval = -ENOMEM;
709                                         goto error;
710                                 }
711                                 bus_pfmem[count]->type = PFMEM;
712                                 bus_pfmem[count]->busno = func->busno;
713                                 bus_pfmem[count]->devfunc = PCI_DEVFN(func->device,
714                                                         func->function);
715                                 bus_pfmem[count]->len = len[count];
716                                 bus_pfmem[count]->fromMem = 0;
717                                 if (ibmphp_check_resource (bus_pfmem[count], 0) == 0) {
718                                         ibmphp_add_resource (bus_pfmem[count]);
719                                         func->pfmem[count] = bus_pfmem[count];
720                                 } else {
721                                         mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
722                                         if (!mem_tmp) {
723                                                 err ("out of system memory\n");
724                                                 retval = -ENOMEM;
725                                                 goto error;
726                                         }
727                                         mem_tmp->type = MEM;
728                                         mem_tmp->busno = bus_pfmem[count]->busno;
729                                         mem_tmp->devfunc = bus_pfmem[count]->devfunc;
730                                         mem_tmp->len = bus_pfmem[count]->len;
731                                         if (ibmphp_check_resource (mem_tmp, 0) == 0) {
732                                                 ibmphp_add_resource (mem_tmp);
733                                                 bus_pfmem[count]->fromMem = 1;
734                                                 bus_pfmem[count]->rangeno = mem_tmp->rangeno;
735                                                 ibmphp_add_pfmem_from_mem (bus_pfmem[count]);
736                                                 func->pfmem[count] = bus_pfmem[count];
737                                         } else {
738                                                 err ("cannot allocate requested pfmem for bus %x, device %x, len %x\n", 
739                                                      func->busno, func->device, len[count]);
740                                                 kfree (mem_tmp);
741                                                 kfree (bus_pfmem[count]);
742                                                 return -EIO;
743                                         }
744                                 }
745
746                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
747
748                                 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
749                                         /* takes up another dword */
750                                         count += 1;
751                                         /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
752                                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0x00000000);
753
754                                 }
755                         } else {
756                                 /* regular memory */
757                                 len[count] = bar[count] & 0xFFFFFFF0;
758                                 len[count] = ~len[count] + 1;
759
760                                 debug ("len[count] in Memory is %x\n", len[count]);
761
762                                 bus_mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
763                                 if (!bus_mem[count]) {
764                                         err ("out of system memory\n");
765                                         retval = -ENOMEM;
766                                         goto error;
767                                 }
768                                 bus_mem[count]->type = MEM;
769                                 bus_mem[count]->busno = func->busno;
770                                 bus_mem[count]->devfunc = PCI_DEVFN(func->device,
771                                                         func->function);
772                                 bus_mem[count]->len = len[count];
773                                 if (ibmphp_check_resource (bus_mem[count], 0) == 0) {
774                                         ibmphp_add_resource (bus_mem[count]);
775                                         func->mem[count] = bus_mem[count];
776                                 } else {
777                                         err ("cannot allocate requested mem for bus %x, device %x, len %x\n",
778                                              func->busno, func->device, len[count]);
779                                         kfree (bus_mem[count]);
780                                         return -EIO;
781                                 }
782
783                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
784
785                                 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
786                                         /* takes up another dword */
787                                         count += 1;
788                                         /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
789                                         pci_bus_write_config_dword (ibmphp_pci_bus, devfn, address[count], 0x00000000);
790
791                                 }
792                         }
793                 }               /* end of mem */
794         }                       /* end of for  */
795
796         /* Now need to see how much space the devices behind the bridge needed */
797         amount_needed = scan_behind_bridge (func, sec_number);
798         if (amount_needed == NULL)
799                 return -ENOMEM;
800
801         ibmphp_pci_bus->number = func->busno;
802         debug ("after coming back from scan_behind_bridge\n");
803         debug ("amount_needed->not_correct = %x\n", amount_needed->not_correct);
804         debug ("amount_needed->io = %x\n", amount_needed->io);
805         debug ("amount_needed->mem = %x\n", amount_needed->mem);
806         debug ("amount_needed->pfmem =  %x\n", amount_needed->pfmem);
807
808         if (amount_needed->not_correct) {               
809                 debug ("amount_needed is not correct\n");
810                 for (count = 0; address[count]; count++) {
811                         /* for 2 BARs */
812                         if (bus_io[count]) {
813                                 ibmphp_remove_resource (bus_io[count]);
814                                 func->io[count] = NULL;
815                         } else if (bus_pfmem[count]) {
816                                 ibmphp_remove_resource (bus_pfmem[count]);
817                                 func->pfmem[count] = NULL;
818                         } else if (bus_mem[count]) {
819                                 ibmphp_remove_resource (bus_mem[count]);
820                                 func->mem[count] = NULL;
821                         }
822                 }
823                 kfree (amount_needed);
824                 return -ENODEV;
825         }
826
827         if (!amount_needed->io) {
828                 debug ("it doesn't want IO?\n");
829                 flag_io = 1;
830         } else {
831                 debug ("it wants %x IO behind the bridge\n", amount_needed->io);
832                 io = kzalloc(sizeof(*io), GFP_KERNEL);
833                 
834                 if (!io) {
835                         err ("out of system memory\n");
836                         retval = -ENOMEM;
837                         goto error;
838                 }
839                 io->type = IO;
840                 io->busno = func->busno;
841                 io->devfunc = PCI_DEVFN(func->device, func->function);
842                 io->len = amount_needed->io;
843                 if (ibmphp_check_resource (io, 1) == 0) {
844                         debug ("were we able to add io\n");
845                         ibmphp_add_resource (io);
846                         flag_io = 1;
847                 }
848         }
849
850         if (!amount_needed->mem) {
851                 debug ("it doesn't want n.e.memory?\n");
852                 flag_mem = 1;
853         } else {
854                 debug ("it wants %x memory behind the bridge\n", amount_needed->mem);
855                 mem = kzalloc(sizeof(*mem), GFP_KERNEL);
856                 if (!mem) {
857                         err ("out of system memory\n");
858                         retval = -ENOMEM;
859                         goto error;
860                 }
861                 mem->type = MEM;
862                 mem->busno = func->busno;
863                 mem->devfunc = PCI_DEVFN(func->device, func->function);
864                 mem->len = amount_needed->mem;
865                 if (ibmphp_check_resource (mem, 1) == 0) {
866                         ibmphp_add_resource (mem);
867                         flag_mem = 1;
868                         debug ("were we able to add mem\n");
869                 }
870         }
871
872         if (!amount_needed->pfmem) {
873                 debug ("it doesn't want n.e.pfmem mem?\n");
874                 flag_pfmem = 1;
875         } else {
876                 debug ("it wants %x pfmemory behind the bridge\n", amount_needed->pfmem);
877                 pfmem = kzalloc(sizeof(*pfmem), GFP_KERNEL);
878                 if (!pfmem) {
879                         err ("out of system memory\n");
880                         retval = -ENOMEM;
881                         goto error;
882                 }
883                 pfmem->type = PFMEM;
884                 pfmem->busno = func->busno;
885                 pfmem->devfunc = PCI_DEVFN(func->device, func->function);
886                 pfmem->len = amount_needed->pfmem;
887                 pfmem->fromMem = 0;
888                 if (ibmphp_check_resource (pfmem, 1) == 0) {
889                         ibmphp_add_resource (pfmem);
890                         flag_pfmem = 1;
891                 } else {
892                         mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
893                         if (!mem_tmp) {
894                                 err ("out of system memory\n");
895                                 retval = -ENOMEM;
896                                 goto error;
897                         }
898                         mem_tmp->type = MEM;
899                         mem_tmp->busno = pfmem->busno;
900                         mem_tmp->devfunc = pfmem->devfunc;
901                         mem_tmp->len = pfmem->len;
902                         if (ibmphp_check_resource (mem_tmp, 1) == 0) {
903                                 ibmphp_add_resource (mem_tmp);
904                                 pfmem->fromMem = 1;
905                                 pfmem->rangeno = mem_tmp->rangeno;
906                                 ibmphp_add_pfmem_from_mem (pfmem);
907                                 flag_pfmem = 1;
908                         }
909                 }
910         }
911
912         debug ("b4 if (flag_io && flag_mem && flag_pfmem)\n");
913         debug ("flag_io = %x, flag_mem = %x, flag_pfmem = %x\n", flag_io, flag_mem, flag_pfmem);
914
915         if (flag_io && flag_mem && flag_pfmem) {
916                 /* If on bootup, there was a bridged card in this slot,
917                  * then card was removed and ibmphp got unloaded and loaded
918                  * back again, there's no way for us to remove the bus
919                  * struct, so no need to kmalloc, can use existing node
920                  */
921                 bus = ibmphp_find_res_bus (sec_number);
922                 if (!bus) {
923                         bus = kzalloc(sizeof(*bus), GFP_KERNEL);
924                         if (!bus) {
925                                 err ("out of system memory\n");
926                                 retval = -ENOMEM;
927                                 goto error;
928                         }
929                         bus->busno = sec_number;
930                         debug ("b4 adding new bus\n");
931                         rc = add_new_bus (bus, io, mem, pfmem, func->busno);
932                 } else if (!(bus->rangeIO) && !(bus->rangeMem) && !(bus->rangePFMem))
933                         rc = add_new_bus (bus, io, mem, pfmem, 0xFF);
934                 else {
935                         err ("expected bus structure not empty?\n");
936                         retval = -EIO;
937                         goto error;
938                 }
939                 if (rc) {
940                         if (rc == -ENOMEM) {
941                                 ibmphp_remove_bus (bus, func->busno);
942                                 kfree (amount_needed);
943                                 return rc;
944                         }
945                         retval = rc;
946                         goto error;
947                 }
948                 pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_IO_BASE, &io_base);
949                 pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &pfmem_base);
950
951                 if ((io_base & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
952                         debug ("io 32\n");
953                         need_io_upper = 1;
954                 }
955                 if ((pfmem_base & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
956                         debug ("pfmem 64\n");
957                         need_pfmem_upper = 1;
958                 }
959
960                 if (bus->noIORanges) {
961                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00 | bus->rangeIO->start >> 8);
962                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00 | bus->rangeIO->end >> 8); 
963
964                         /* _______________This is for debugging purposes only ____________________
965                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_IO_BASE, &temp);
966                         debug ("io_base = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
967                         pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_IO_LIMIT, &temp);
968                         debug ("io_limit = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
969                          ________________________________________________________________________*/
970
971                         if (need_io_upper) {    /* since can't support n.e.ways */
972                                 pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_IO_BASE_UPPER16, 0x0000);
973                                 pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, 0x0000);
974                         }
975                 } else {
976                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00);
977                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00);
978                 }
979
980                 if (bus->noMemRanges) {
981                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0x0000 | bus->rangeMem->start >> 16);
982                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000 | bus->rangeMem->end >> 16);
983                         
984                         /* ____________________This is for debugging purposes only ________________________
985                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, &temp);
986                         debug ("mem_base = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
987                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, &temp);
988                         debug ("mem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
989                          __________________________________________________________________________________*/
990
991                 } else {
992                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0xffff);
993                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000);
994                 }
995                 if (bus->noPFMemRanges) {
996                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0x0000 | bus->rangePFMem->start >> 16);
997                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000 | bus->rangePFMem->end >> 16);
998
999                         /* __________________________This is for debugging purposes only _______________________
1000                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &temp);
1001                         debug ("pfmem_base = %x", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
1002                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &temp);
1003                         debug ("pfmem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
1004                          ______________________________________________________________________________________*/
1005
1006                         if (need_pfmem_upper) { /* since can't support n.e.ways */
1007                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, PCI_PREF_BASE_UPPER32, 0x00000000);
1008                                 pci_bus_write_config_dword (ibmphp_pci_bus, devfn, PCI_PREF_LIMIT_UPPER32, 0x00000000);
1009                         }
1010                 } else {
1011                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0xffff);
1012                         pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000);
1013                 }
1014
1015                 debug ("b4 writing control information\n");
1016
1017                 pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
1018                 if ((irq > 0x00) && (irq < 0x05))
1019                         pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
1020                 /*    
1021                 pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, ctrl);
1022                 pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_PARITY);
1023                 pci_bus_write_config_byte (ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_SERR);
1024                  */
1025
1026                 pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
1027                 pci_bus_write_config_word (ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, 0x07);
1028                 for (i = 0; i < 32; i++) {
1029                         if (amount_needed->devices[i]) {
1030                                 debug ("device where devices[i] is 1 = %x\n", i);
1031                                 func->devices[i] = 1;
1032                         }
1033                 }
1034                 func->bus = 1;  /* For unconfiguring, to indicate it's PPB */
1035                 func_passed = &func;
1036                 debug ("func->busno b4 returning is %x\n", func->busno);
1037                 debug ("func->busno b4 returning in the other structure is %x\n", (*func_passed)->busno);
1038                 kfree (amount_needed);
1039                 return 0;
1040         } else {
1041                 err ("Configuring bridge was unsuccessful...\n");
1042                 mem_tmp = NULL;
1043                 retval = -EIO;
1044                 goto error;
1045         }
1046
1047 error:
1048         kfree(amount_needed);
1049         if (pfmem)
1050                 ibmphp_remove_resource (pfmem);
1051         if (io)
1052                 ibmphp_remove_resource (io);
1053         if (mem)
1054                 ibmphp_remove_resource (mem);
1055         for (i = 0; i < 2; i++) {       /* for 2 BARs */
1056                 if (bus_io[i]) {
1057                         ibmphp_remove_resource (bus_io[i]);
1058                         func->io[i] = NULL;
1059                 } else if (bus_pfmem[i]) {
1060                         ibmphp_remove_resource (bus_pfmem[i]);
1061                         func->pfmem[i] = NULL;
1062                 } else if (bus_mem[i]) {
1063                         ibmphp_remove_resource (bus_mem[i]);
1064                         func->mem[i] = NULL;
1065                 }
1066         }
1067         return retval;
1068 }
1069
1070 /*****************************************************************************
1071  * This function adds up the amount of resources needed behind the PPB bridge
1072  * and passes it to the configure_bridge function
1073  * Input: bridge function
1074  * Ouput: amount of resources needed
1075  *****************************************************************************/
1076 static struct res_needed *scan_behind_bridge (struct pci_func * func, u8 busno)
1077 {
1078         int count, len[6];
1079         u16 vendor_id;
1080         u8 hdr_type;
1081         u8 device, function;
1082         unsigned int devfn;
1083         int howmany = 0;        /*this is to see if there are any devices behind the bridge */
1084
1085         u32 bar[6], class;
1086         u32 address[] = {
1087                 PCI_BASE_ADDRESS_0,
1088                 PCI_BASE_ADDRESS_1,
1089                 PCI_BASE_ADDRESS_2,
1090                 PCI_BASE_ADDRESS_3,
1091                 PCI_BASE_ADDRESS_4,
1092                 PCI_BASE_ADDRESS_5,
1093                 0
1094         };
1095         struct res_needed *amount;
1096
1097         amount = kzalloc(sizeof(*amount), GFP_KERNEL);
1098         if (amount == NULL)
1099                 return NULL;
1100
1101         ibmphp_pci_bus->number = busno;
1102
1103         debug ("the bus_no behind the bridge is %x\n", busno);
1104         debug ("scanning devices behind the bridge...\n");
1105         for (device = 0; device < 32; device++) {
1106                 amount->devices[device] = 0;
1107                 for (function = 0; function < 8; function++) {
1108                         devfn = PCI_DEVFN(device, function);
1109
1110                         pci_bus_read_config_word (ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
1111
1112                         if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
1113                                 /* found correct device!!! */
1114                                 howmany++;
1115
1116                                 pci_bus_read_config_byte (ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
1117                                 pci_bus_read_config_dword (ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
1118
1119                                 debug ("hdr_type behind the bridge is %x\n", hdr_type);
1120                                 if (hdr_type & PCI_HEADER_TYPE_BRIDGE) {
1121                                         err ("embedded bridges not supported for hot-plugging.\n");
1122                                         amount->not_correct = 1;
1123                                         return amount;
1124                                 }
1125
1126                                 class >>= 8;    /* to take revision out, class = class.subclass.prog i/f */
1127                                 if (class == PCI_CLASS_NOT_DEFINED_VGA) {
1128                                         err ("The device %x is VGA compatible and as is not supported for hot plugging. "
1129                                              "Please choose another device.\n", device);
1130                                         amount->not_correct = 1;
1131                                         return amount;
1132                                 } else if (class == PCI_CLASS_DISPLAY_VGA) {
1133                                         err ("The device %x is not supported for hot plugging. "
1134                                              "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. "
1487                                      "Please choose another device.\n", device, function);
1488                                 return -ENODEV;
1489                         } else if (class == PCI_CLASS_DISPLAY_VGA) {
1490                                 err ("The device %x function %x is not supported for hot removing. "
1491                                      "Please choose another device.\n", device, function);
1492                                 return -ENODEV;
1493                         }
1494
1495                         switch (hdr_type) {
1496                                 case PCI_HEADER_TYPE_NORMAL:
1497                                         rc = unconfigure_boot_device (busno, device, function);
1498                                         if (rc) {
1499                                                 err ("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
1500                                                      device, function, busno);
1501                                                 return rc;
1502                                         }
1503                                         function = 0x8;
1504                                         break;
1505                                 case PCI_HEADER_TYPE_MULTIDEVICE:
1506                                         rc = unconfigure_boot_device (busno, device, function);
1507                                         if (rc) {
1508                                                 err ("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
1509                                                      device, function, busno);
1510                                                 return rc;
1511                                         }
1512                                         break;
1513                                 case PCI_HEADER_TYPE_BRIDGE:
1514                                         class >>= 8;
1515                                         if (class != PCI_CLASS_BRIDGE_PCI) {
1516                                                 err ("This device %x function %x is not PCI-to-PCI bridge, "
1517                                                      "and is not supported for hot-removing. "
1518                                                      "Please try another card.\n", device, function);
1519                                                 return -ENODEV;
1520                                         }
1521                                         rc = unconfigure_boot_bridge (busno, device, function);
1522                                         if (rc != 0) {
1523                                                 err ("was not able to hot-remove PPB properly.\n");
1524                                                 return rc;
1525                                         }
1526
1527                                         function = 0x8;
1528                                         break;
1529                                 case PCI_HEADER_TYPE_MULTIBRIDGE:
1530                                         class >>= 8;
1531                                         if (class != PCI_CLASS_BRIDGE_PCI) {
1532                                                 err ("This device %x function %x is not PCI-to-PCI bridge, "
1533                                                      "and is not supported for hot-removing. "
1534                                                      "Please try another card.\n", device, function);
1535                                                 return -ENODEV;
1536                                         }
1537                                         rc = unconfigure_boot_bridge (busno, device, function);
1538                                         if (rc != 0) {
1539                                                 err ("was not able to hot-remove PPB properly.\n");
1540                                                 return rc;
1541                                         }
1542                                         break;
1543                                 default:
1544                                         err ("MAJOR PROBLEM!!!! Cannot read device's header\n");
1545                                         return -1;
1546                                         break;
1547                         }       /* end of switch */
1548                 }       /* end of valid device */
1549         }       /* end of for */
1550
1551         if (!valid_device) {
1552                 err ("Could not find device to unconfigure.  Or could not read the card.\n");
1553                 return -1;
1554         }
1555         return 0;
1556 }
1557
1558 /*
1559  * free the resources of the card (multi, single, or bridged)
1560  * Parameters: slot, flag to say if this is for removing entire module or just
1561  * unconfiguring the device
1562  * TO DO:  will probably need to add some code in case there was some resource,
1563  * to remove it... this is from when we have errors in the configure_card...
1564  *                      !!!!!!!!!!!!!!!!!!!!!!!!!FOR BUSES!!!!!!!!!!!!
1565  * Returns: 0, -1, -ENODEV 
1566  */
1567 int ibmphp_unconfigure_card (struct slot **slot_cur, int the_end)
1568 {
1569         int i;
1570         int count;
1571         int rc;
1572         struct slot *sl = *slot_cur;
1573         struct pci_func *cur_func = NULL;
1574         struct pci_func *temp_func;
1575
1576         debug ("%s - enter\n", __func__);
1577
1578         if (!the_end) {
1579                 /* Need to unconfigure the card */
1580                 rc = unconfigure_boot_card (sl);
1581                 if ((rc == -ENODEV) || (rc == -EIO) || (rc == -EINVAL)) {
1582                         /* In all other cases, will still need to get rid of func structure if it exists */
1583                         return rc;
1584                 }
1585         }
1586
1587         if (sl->func) {
1588                 cur_func = sl->func;
1589                 while (cur_func) {
1590                         /* TO DO: WILL MOST LIKELY NEED TO GET RID OF THE BUS STRUCTURE FROM RESOURCES AS WELL */
1591                         if (cur_func->bus) {
1592                                 /* in other words, it's a PPB */
1593                                 count = 2;
1594                         } else {
1595                                 count = 6;
1596                         }
1597
1598                         for (i = 0; i < count; i++) {
1599                                 if (cur_func->io[i]) {
1600                                         debug ("io[%d] exists\n", i);
1601                                         if (the_end > 0)
1602                                                 ibmphp_remove_resource (cur_func->io[i]);
1603                                         cur_func->io[i] = NULL;
1604                                 }
1605                                 if (cur_func->mem[i]) {
1606                                         debug ("mem[%d] exists\n", i);
1607                                         if (the_end > 0)
1608                                                 ibmphp_remove_resource (cur_func->mem[i]);
1609                                         cur_func->mem[i] = NULL;
1610                                 }
1611                                 if (cur_func->pfmem[i]) {
1612                                         debug ("pfmem[%d] exists\n", i);
1613                                         if (the_end > 0)
1614                                                 ibmphp_remove_resource (cur_func->pfmem[i]);
1615                                         cur_func->pfmem[i] = NULL;
1616                                 }
1617                         }
1618
1619                         temp_func = cur_func->next;
1620                         kfree (cur_func);
1621                         cur_func = temp_func;
1622                 }
1623         }
1624
1625         sl->func = NULL;
1626         *slot_cur = sl;
1627         debug ("%s - exit\n", __func__);
1628         return 0;
1629 }
1630
1631 /*
1632  * add a new bus resulting from hot-plugging a PPB bridge with devices
1633  *
1634  * Input: bus and the amount of resources needed (we know we can assign those,
1635  *        since they've been checked already
1636  * Output: bus added to the correct spot
1637  *         0, -1, error 
1638  */
1639 static int add_new_bus (struct bus_node *bus, struct resource_node *io, struct resource_node *mem, struct resource_node *pfmem, u8 parent_busno)
1640 {
1641         struct range_node *io_range = NULL;
1642         struct range_node *mem_range = NULL;
1643         struct range_node *pfmem_range = NULL;
1644         struct bus_node *cur_bus = NULL;
1645
1646         /* Trying to find the parent bus number */
1647         if (parent_busno != 0xFF) {
1648                 cur_bus = ibmphp_find_res_bus (parent_busno);
1649                 if (!cur_bus) {
1650                         err ("strange, cannot find bus which is supposed to be at the system... something is terribly wrong...\n");
1651                         return -ENODEV;
1652                 }
1653         
1654                 list_add (&bus->bus_list, &cur_bus->bus_list);
1655         }
1656         if (io) {
1657                 io_range = kzalloc(sizeof(*io_range), GFP_KERNEL);
1658                 if (!io_range) {
1659                         err ("out of system memory\n");
1660                         return -ENOMEM;
1661                 }
1662                 io_range->start = io->start;
1663                 io_range->end = io->end;
1664                 io_range->rangeno = 1;
1665                 bus->noIORanges = 1;
1666                 bus->rangeIO = io_range;
1667         }
1668         if (mem) {
1669                 mem_range = kzalloc(sizeof(*mem_range), GFP_KERNEL);
1670                 if (!mem_range) {
1671                         err ("out of system memory\n");
1672                         return -ENOMEM;
1673                 }
1674                 mem_range->start = mem->start;
1675                 mem_range->end = mem->end;
1676                 mem_range->rangeno = 1;
1677                 bus->noMemRanges = 1;
1678                 bus->rangeMem = mem_range;
1679         }
1680         if (pfmem) {
1681                 pfmem_range = kzalloc(sizeof(*pfmem_range), GFP_KERNEL);
1682                 if (!pfmem_range) {     
1683                         err ("out of system memory\n");
1684                         return -ENOMEM;
1685                 }
1686                 pfmem_range->start = pfmem->start;
1687                 pfmem_range->end = pfmem->end;
1688                 pfmem_range->rangeno = 1;
1689                 bus->noPFMemRanges = 1;
1690                 bus->rangePFMem = pfmem_range;
1691         }
1692         return 0;
1693 }
1694
1695 /*
1696  * find the 1st available bus number for PPB to set as its secondary bus
1697  * Parameters: bus_number of the primary bus
1698  * Returns: bus_number of the secondary bus or 0xff in case of failure
1699  */
1700 static u8 find_sec_number (u8 primary_busno, u8 slotno)
1701 {
1702         int min, max;
1703         u8 busno;
1704         struct bus_info *bus;
1705         struct bus_node *bus_cur;
1706
1707         bus = ibmphp_find_same_bus_num (primary_busno);
1708         if (!bus) {
1709                 err ("cannot get slot range of the bus from the BIOS\n");
1710                 return 0xff;
1711         }
1712         max = bus->slot_max;
1713         min = bus->slot_min;
1714         if ((slotno > max) || (slotno < min)) {
1715                 err ("got the wrong range\n");
1716                 return 0xff;
1717         }
1718         busno = (u8) (slotno - (u8) min);
1719         busno += primary_busno + 0x01;
1720         bus_cur = ibmphp_find_res_bus (busno);
1721         /* either there is no such bus number, or there are no ranges, which
1722          * can only happen if we removed the bridged device in previous load
1723          * of the driver, and now only have the skeleton bus struct
1724          */
1725         if ((!bus_cur) || (!(bus_cur->rangeIO) && !(bus_cur->rangeMem) && !(bus_cur->rangePFMem)))
1726                 return busno;
1727         return 0xff;
1728 }
1729