kernel/drivers/pci/hotplug/ibmphp_pci.c

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