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1// SPDX-License-Identifier: GPL-2.0+2/*3 * IBM Hot Plug Controller Driver4 *5 * Written By: Irene Zubarev, IBM Corporation6 *7 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)8 * Copyright (C) 2001,2002 IBM Corp.9 *10 * All rights reserved.11 *12 * Send feedback to <gregkh@us.ibm.com>13 *14 */15 16#include <linux/module.h>17#include <linux/slab.h>18#include <linux/pci.h>19#include <linux/list.h>20#include "ibmphp.h"21 22 23static int configure_device(struct pci_func *);24static int configure_bridge(struct pci_func **, u8);25static struct res_needed *scan_behind_bridge(struct pci_func *, u8);26static int add_new_bus(struct bus_node *, struct resource_node *, struct resource_node *, struct resource_node *, u8);27static u8 find_sec_number(u8 primary_busno, u8 slotno);28 29/*30 * NOTE..... If BIOS doesn't provide default routing, we assign:31 * 9 for SCSI, 10 for LAN adapters, and 11 for everything else.32 * If adapter is bridged, then we assign 11 to it and devices behind it.33 * We also assign the same irq numbers for multi function devices.34 * These are PIC mode, so shouldn't matter n.e.ways (hopefully)35 */36static void assign_alt_irq(struct pci_func *cur_func, u8 class_code)37{38 int j;39 for (j = 0; j < 4; j++) {40 if (cur_func->irq[j] == 0xff) {41 switch (class_code) {42 case PCI_BASE_CLASS_STORAGE:43 cur_func->irq[j] = SCSI_IRQ;44 break;45 case PCI_BASE_CLASS_NETWORK:46 cur_func->irq[j] = LAN_IRQ;47 break;48 default:49 cur_func->irq[j] = OTHER_IRQ;50 break;51 }52 }53 }54}55 56/*57 * Configures the device to be added (will allocate needed resources if it58 * can), the device can be a bridge or a regular pci device, can also be59 * multi-functional60 *61 * Input: function to be added62 *63 * TO DO: The error case with Multifunction device or multi function bridge,64 * if there is an error, will need to go through all previous functions and65 * unconfigure....or can add some code into unconfigure_card....66 */67int ibmphp_configure_card(struct pci_func *func, u8 slotno)68{69 u16 vendor_id;70 u32 class;71 u8 class_code;72 u8 hdr_type, device, sec_number;73 u8 function;74 struct pci_func *newfunc; /* for multi devices */75 struct pci_func *cur_func, *prev_func;76 int rc, i, j;77 int cleanup_count;78 u8 flag;79 u8 valid_device = 0x00; /* to see if we are able to read from card any device info at all */80 81 debug("inside configure_card, func->busno = %x\n", func->busno);82 83 device = func->device;84 cur_func = func;85 86 /* We only get bus and device from IRQ routing table. So at this point,87 * func->busno is correct, and func->device contains only device (at the 588 * highest bits)89 */90 91 /* For every function on the card */92 for (function = 0x00; function < 0x08; function++) {93 unsigned int devfn = PCI_DEVFN(device, function);94 ibmphp_pci_bus->number = cur_func->busno;95 96 cur_func->function = function;97 98 debug("inside the loop, cur_func->busno = %x, cur_func->device = %x, cur_func->function = %x\n",99 cur_func->busno, cur_func->device, cur_func->function);100 101 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);102 103 debug("vendor_id is %x\n", vendor_id);104 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {105 /* found correct device!!! */106 debug("found valid device, vendor_id = %x\n", vendor_id);107 108 ++valid_device;109 110 /* header: x x x x x x x x111 * | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge112 * |_=> 0 = single function device, 1 = multi-function device113 */114 115 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);116 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);117 118 class_code = class >> 24;119 debug("hrd_type = %x, class = %x, class_code %x\n", hdr_type, class, class_code);120 class >>= 8; /* to take revision out, class = class.subclass.prog i/f */121 if (class == PCI_CLASS_NOT_DEFINED_VGA) {122 err("The device %x is VGA compatible and as is not supported for hot plugging. "123 "Please choose another device.\n", cur_func->device);124 return -ENODEV;125 } else if (class == PCI_CLASS_DISPLAY_VGA) {126 err("The device %x is not supported for hot plugging. Please choose another device.\n",127 cur_func->device);128 return -ENODEV;129 }130 switch (hdr_type) {131 case PCI_HEADER_TYPE_NORMAL:132 debug("single device case.... vendor id = %x, hdr_type = %x, class = %x\n", vendor_id, hdr_type, class);133 assign_alt_irq(cur_func, class_code);134 rc = configure_device(cur_func);135 if (rc < 0) {136 /* We need to do this in case some other BARs were properly inserted */137 err("was not able to configure devfunc %x on bus %x.\n",138 cur_func->device, cur_func->busno);139 cleanup_count = 6;140 goto error;141 }142 cur_func->next = NULL;143 function = 0x8;144 break;145 case PCI_HEADER_TYPE_MULTIDEVICE:146 assign_alt_irq(cur_func, class_code);147 rc = configure_device(cur_func);148 if (rc < 0) {149 /* We need to do this in case some other BARs were properly inserted */150 err("was not able to configure devfunc %x on bus %x...bailing out\n",151 cur_func->device, cur_func->busno);152 cleanup_count = 6;153 goto error;154 }155 newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);156 if (!newfunc)157 return -ENOMEM;158 159 newfunc->busno = cur_func->busno;160 newfunc->device = device;161 cur_func->next = newfunc;162 cur_func = newfunc;163 for (j = 0; j < 4; j++)164 newfunc->irq[j] = cur_func->irq[j];165 break;166 case PCI_HEADER_TYPE_MULTIBRIDGE:167 class >>= 8;168 if (class != PCI_CLASS_BRIDGE_PCI) {169 err("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. Please insert another card.\n",170 cur_func->device);171 return -ENODEV;172 }173 assign_alt_irq(cur_func, class_code);174 rc = configure_bridge(&cur_func, slotno);175 if (rc == -ENODEV) {176 err("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");177 err("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);178 return rc;179 }180 if (rc) {181 /* We need to do this in case some other BARs were properly inserted */182 err("was not able to hot-add PPB properly.\n");183 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */184 cleanup_count = 2;185 goto error;186 }187 188 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);189 flag = 0;190 for (i = 0; i < 32; i++) {191 if (func->devices[i]) {192 newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);193 if (!newfunc)194 return -ENOMEM;195 196 newfunc->busno = sec_number;197 newfunc->device = (u8) i;198 for (j = 0; j < 4; j++)199 newfunc->irq[j] = cur_func->irq[j];200 201 if (flag) {202 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;203 prev_func->next = newfunc;204 } else205 cur_func->next = newfunc;206 207 rc = ibmphp_configure_card(newfunc, slotno);208 /* This could only happen if kmalloc failed */209 if (rc) {210 /* We need to do this in case bridge itself got configured properly, but devices behind it failed */211 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */212 cleanup_count = 2;213 goto error;214 }215 flag = 1;216 }217 }218 219 newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);220 if (!newfunc)221 return -ENOMEM;222 223 newfunc->busno = cur_func->busno;224 newfunc->device = device;225 for (j = 0; j < 4; j++)226 newfunc->irq[j] = cur_func->irq[j];227 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next);228 prev_func->next = newfunc;229 cur_func = newfunc;230 break;231 case PCI_HEADER_TYPE_BRIDGE:232 class >>= 8;233 debug("class now is %x\n", class);234 if (class != PCI_CLASS_BRIDGE_PCI) {235 err("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. Please insert another card.\n",236 cur_func->device);237 return -ENODEV;238 }239 240 assign_alt_irq(cur_func, class_code);241 242 debug("cur_func->busno b4 configure_bridge is %x\n", cur_func->busno);243 rc = configure_bridge(&cur_func, slotno);244 if (rc == -ENODEV) {245 err("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");246 err("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);247 return rc;248 }249 if (rc) {250 /* We need to do this in case some other BARs were properly inserted */251 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */252 err("was not able to hot-add PPB properly.\n");253 cleanup_count = 2;254 goto error;255 }256 debug("cur_func->busno = %x, device = %x, function = %x\n",257 cur_func->busno, device, function);258 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);259 debug("after configuring bridge..., sec_number = %x\n", sec_number);260 flag = 0;261 for (i = 0; i < 32; i++) {262 if (func->devices[i]) {263 debug("inside for loop, device is %x\n", i);264 newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);265 if (!newfunc)266 return -ENOMEM;267 268 newfunc->busno = sec_number;269 newfunc->device = (u8) i;270 for (j = 0; j < 4; j++)271 newfunc->irq[j] = cur_func->irq[j];272 273 if (flag) {274 for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next);275 prev_func->next = newfunc;276 } else277 cur_func->next = newfunc;278 279 rc = ibmphp_configure_card(newfunc, slotno);280 281 /* Again, this case should not happen... For complete paranoia, will need to call remove_bus */282 if (rc) {283 /* We need to do this in case some other BARs were properly inserted */284 func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */285 cleanup_count = 2;286 goto error;287 }288 flag = 1;289 }290 }291 292 function = 0x8;293 break;294 default:295 err("MAJOR PROBLEM!!!!, header type not supported? %x\n", hdr_type);296 return -ENXIO;297 } /* end of switch */298 } /* end of valid device */299 } /* end of for */300 301 if (!valid_device) {302 err("Cannot find any valid devices on the card. Or unable to read from card.\n");303 return -ENODEV;304 }305 306 return 0;307 308error:309 for (i = 0; i < cleanup_count; i++) {310 if (cur_func->io[i]) {311 ibmphp_remove_resource(cur_func->io[i]);312 cur_func->io[i] = NULL;313 } else if (cur_func->pfmem[i]) {314 ibmphp_remove_resource(cur_func->pfmem[i]);315 cur_func->pfmem[i] = NULL;316 } else if (cur_func->mem[i]) {317 ibmphp_remove_resource(cur_func->mem[i]);318 cur_func->mem[i] = NULL;319 }320 }321 return rc;322}323 324/*325 * This function configures the pci BARs of a single device.326 * Input: pointer to the pci_func327 * Output: configured PCI, 0, or error328 */329static int configure_device(struct pci_func *func)330{331 u32 bar[6];332 static const u32 address[] = {333 PCI_BASE_ADDRESS_0,334 PCI_BASE_ADDRESS_1,335 PCI_BASE_ADDRESS_2,336 PCI_BASE_ADDRESS_3,337 PCI_BASE_ADDRESS_4,338 PCI_BASE_ADDRESS_5,339 0340 };341 u8 irq;342 int count;343 int len[6];344 struct resource_node *io[6];345 struct resource_node *mem[6];346 struct resource_node *mem_tmp;347 struct resource_node *pfmem[6];348 unsigned int devfn;349 350 debug("%s - inside\n", __func__);351 352 devfn = PCI_DEVFN(func->device, func->function);353 ibmphp_pci_bus->number = func->busno;354 355 for (count = 0; address[count]; count++) { /* for 6 BARs */356 357 /* not sure if i need this. per scott, said maybe need * something like this358 if devices don't adhere 100% to the spec, so don't want to write359 to the reserved bits360 361 pcibios_read_config_byte(cur_func->busno, cur_func->device,362 PCI_BASE_ADDRESS_0 + 4 * count, &tmp);363 if (tmp & 0x01) // IO364 pcibios_write_config_dword(cur_func->busno, cur_func->device,365 PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFD);366 else // Memory367 pcibios_write_config_dword(cur_func->busno, cur_func->device,368 PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFF);369 */370 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);371 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);372 373 if (!bar[count]) /* This BAR is not implemented */374 continue;375 376 debug("Device %x BAR %d wants %x\n", func->device, count, bar[count]);377 378 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {379 /* This is IO */380 debug("inside IO SPACE\n");381 382 len[count] = bar[count] & 0xFFFFFFFC;383 len[count] = ~len[count] + 1;384 385 debug("len[count] in IO %x, count %d\n", len[count], count);386 387 io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);388 389 if (!io[count])390 return -ENOMEM;391 392 io[count]->type = IO;393 io[count]->busno = func->busno;394 io[count]->devfunc = PCI_DEVFN(func->device, func->function);395 io[count]->len = len[count];396 if (ibmphp_check_resource(io[count], 0) == 0) {397 ibmphp_add_resource(io[count]);398 func->io[count] = io[count];399 } else {400 err("cannot allocate requested io for bus %x device %x function %x len %x\n",401 func->busno, func->device, func->function, len[count]);402 kfree(io[count]);403 return -EIO;404 }405 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start);406 407 /* _______________This is for debugging purposes only_____________________ */408 debug("b4 writing, the IO address is %x\n", func->io[count]->start);409 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);410 debug("after writing.... the start address is %x\n", bar[count]);411 /* _________________________________________________________________________*/412 413 } else {414 /* This is Memory */415 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {416 /* pfmem */417 debug("PFMEM SPACE\n");418 419 len[count] = bar[count] & 0xFFFFFFF0;420 len[count] = ~len[count] + 1;421 422 debug("len[count] in PFMEM %x, count %d\n", len[count], count);423 424 pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);425 if (!pfmem[count])426 return -ENOMEM;427 428 pfmem[count]->type = PFMEM;429 pfmem[count]->busno = func->busno;430 pfmem[count]->devfunc = PCI_DEVFN(func->device,431 func->function);432 pfmem[count]->len = len[count];433 pfmem[count]->fromMem = 0;434 if (ibmphp_check_resource(pfmem[count], 0) == 0) {435 ibmphp_add_resource(pfmem[count]);436 func->pfmem[count] = pfmem[count];437 } else {438 mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);439 if (!mem_tmp) {440 kfree(pfmem[count]);441 return -ENOMEM;442 }443 mem_tmp->type = MEM;444 mem_tmp->busno = pfmem[count]->busno;445 mem_tmp->devfunc = pfmem[count]->devfunc;446 mem_tmp->len = pfmem[count]->len;447 debug("there's no pfmem... going into mem.\n");448 if (ibmphp_check_resource(mem_tmp, 0) == 0) {449 ibmphp_add_resource(mem_tmp);450 pfmem[count]->fromMem = 1;451 pfmem[count]->rangeno = mem_tmp->rangeno;452 pfmem[count]->start = mem_tmp->start;453 pfmem[count]->end = mem_tmp->end;454 ibmphp_add_pfmem_from_mem(pfmem[count]);455 func->pfmem[count] = pfmem[count];456 } else {457 err("cannot allocate requested pfmem for bus %x, device %x, len %x\n",458 func->busno, func->device, len[count]);459 kfree(mem_tmp);460 kfree(pfmem[count]);461 return -EIO;462 }463 }464 465 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);466 467 /*_______________This is for debugging purposes only______________________________*/468 debug("b4 writing, start address is %x\n", func->pfmem[count]->start);469 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);470 debug("after writing, start address is %x\n", bar[count]);471 /*_________________________________________________________________________________*/472 473 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) { /* takes up another dword */474 debug("inside the mem 64 case, count %d\n", count);475 count += 1;476 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */477 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);478 }479 } else {480 /* regular memory */481 debug("REGULAR MEM SPACE\n");482 483 len[count] = bar[count] & 0xFFFFFFF0;484 len[count] = ~len[count] + 1;485 486 debug("len[count] in Mem %x, count %d\n", len[count], count);487 488 mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);489 if (!mem[count])490 return -ENOMEM;491 492 mem[count]->type = MEM;493 mem[count]->busno = func->busno;494 mem[count]->devfunc = PCI_DEVFN(func->device,495 func->function);496 mem[count]->len = len[count];497 if (ibmphp_check_resource(mem[count], 0) == 0) {498 ibmphp_add_resource(mem[count]);499 func->mem[count] = mem[count];500 } else {501 err("cannot allocate requested mem for bus %x, device %x, len %x\n",502 func->busno, func->device, len[count]);503 kfree(mem[count]);504 return -EIO;505 }506 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);507 /* _______________________This is for debugging purposes only _______________________*/508 debug("b4 writing, start address is %x\n", func->mem[count]->start);509 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);510 debug("after writing, the address is %x\n", bar[count]);511 /* __________________________________________________________________________________*/512 513 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {514 /* takes up another dword */515 debug("inside mem 64 case, reg. mem, count %d\n", count);516 count += 1;517 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */518 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);519 }520 }521 } /* end of mem */522 } /* end of for */523 524 func->bus = 0; /* To indicate that this is not a PPB */525 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);526 if ((irq > 0x00) && (irq < 0x05))527 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);528 529 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);530 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);531 532 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_ROM_ADDRESS, 0x00L);533 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);534 535 return 0;536}537 538/******************************************************************************539 * This routine configures a PCI-2-PCI bridge and the functions behind it540 * Parameters: pci_func541 * Returns:542 ******************************************************************************/543static int configure_bridge(struct pci_func **func_passed, u8 slotno)544{545 int count;546 int i;547 int rc;548 u8 sec_number;549 u8 io_base;550 u16 pfmem_base;551 u32 bar[2];552 u32 len[2];553 u8 flag_io = 0;554 u8 flag_mem = 0;555 u8 flag_pfmem = 0;556 u8 need_io_upper = 0;557 u8 need_pfmem_upper = 0;558 struct res_needed *amount_needed = NULL;559 struct resource_node *io = NULL;560 struct resource_node *bus_io[2] = {NULL, NULL};561 struct resource_node *mem = NULL;562 struct resource_node *bus_mem[2] = {NULL, NULL};563 struct resource_node *mem_tmp = NULL;564 struct resource_node *pfmem = NULL;565 struct resource_node *bus_pfmem[2] = {NULL, NULL};566 struct bus_node *bus;567 static const u32 address[] = {568 PCI_BASE_ADDRESS_0,569 PCI_BASE_ADDRESS_1,570 0571 };572 struct pci_func *func = *func_passed;573 unsigned int devfn;574 u8 irq;575 int retval;576 577 debug("%s - enter\n", __func__);578 579 devfn = PCI_DEVFN(func->function, func->device);580 ibmphp_pci_bus->number = func->busno;581 582 /* Configuring necessary info for the bridge so that we could see the devices583 * behind it584 */585 586 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, func->busno);587 588 /* _____________________For debugging purposes only __________________________589 pci_bus_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);590 debug("primary # written into the bridge is %x\n", pri_number);591 ___________________________________________________________________________*/592 593 /* in EBDA, only get allocated 1 additional bus # per slot */594 sec_number = find_sec_number(func->busno, slotno);595 if (sec_number == 0xff) {596 err("cannot allocate secondary bus number for the bridged device\n");597 return -EINVAL;598 }599 600 debug("after find_sec_number, the number we got is %x\n", sec_number);601 debug("AFTER FIND_SEC_NUMBER, func->busno IS %x\n", func->busno);602 603 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, sec_number);604 605 /* __________________For debugging purposes only __________________________________606 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);607 debug("sec_number after write/read is %x\n", sec_number);608 ________________________________________________________________________________*/609 610 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, sec_number);611 612 /* __________________For debugging purposes only ____________________________________613 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sec_number);614 debug("subordinate number after write/read is %x\n", sec_number);615 __________________________________________________________________________________*/616 617 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);618 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);619 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SEC_LATENCY_TIMER, LATENCY);620 621 debug("func->busno is %x\n", func->busno);622 debug("sec_number after writing is %x\n", sec_number);623 624 625 /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!626 !!!!!!!!!!!!!!!NEED TO ADD!!! FAST BACK-TO-BACK ENABLE!!!!!!!!!!!!!!!!!!!!627 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/628 629 630 /* First we need to allocate mem/io for the bridge itself in case it needs it */631 for (count = 0; address[count]; count++) { /* for 2 BARs */632 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);633 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);634 635 if (!bar[count]) {636 /* This BAR is not implemented */637 debug("so we come here then, eh?, count = %d\n", count);638 continue;639 }640 // tmp_bar = bar[count];641 642 debug("Bar %d wants %x\n", count, bar[count]);643 644 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {645 /* This is IO */646 len[count] = bar[count] & 0xFFFFFFFC;647 len[count] = ~len[count] + 1;648 649 debug("len[count] in IO = %x\n", len[count]);650 651 bus_io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);652 653 if (!bus_io[count]) {654 retval = -ENOMEM;655 goto error;656 }657 bus_io[count]->type = IO;658 bus_io[count]->busno = func->busno;659 bus_io[count]->devfunc = PCI_DEVFN(func->device,660 func->function);661 bus_io[count]->len = len[count];662 if (ibmphp_check_resource(bus_io[count], 0) == 0) {663 ibmphp_add_resource(bus_io[count]);664 func->io[count] = bus_io[count];665 } else {666 err("cannot allocate requested io for bus %x, device %x, len %x\n",667 func->busno, func->device, len[count]);668 kfree(bus_io[count]);669 return -EIO;670 }671 672 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start);673 674 } else {675 /* This is Memory */676 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {677 /* pfmem */678 len[count] = bar[count] & 0xFFFFFFF0;679 len[count] = ~len[count] + 1;680 681 debug("len[count] in PFMEM = %x\n", len[count]);682 683 bus_pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);684 if (!bus_pfmem[count]) {685 retval = -ENOMEM;686 goto error;687 }688 bus_pfmem[count]->type = PFMEM;689 bus_pfmem[count]->busno = func->busno;690 bus_pfmem[count]->devfunc = PCI_DEVFN(func->device,691 func->function);692 bus_pfmem[count]->len = len[count];693 bus_pfmem[count]->fromMem = 0;694 if (ibmphp_check_resource(bus_pfmem[count], 0) == 0) {695 ibmphp_add_resource(bus_pfmem[count]);696 func->pfmem[count] = bus_pfmem[count];697 } else {698 mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);699 if (!mem_tmp) {700 retval = -ENOMEM;701 goto error;702 }703 mem_tmp->type = MEM;704 mem_tmp->busno = bus_pfmem[count]->busno;705 mem_tmp->devfunc = bus_pfmem[count]->devfunc;706 mem_tmp->len = bus_pfmem[count]->len;707 if (ibmphp_check_resource(mem_tmp, 0) == 0) {708 ibmphp_add_resource(mem_tmp);709 bus_pfmem[count]->fromMem = 1;710 bus_pfmem[count]->rangeno = mem_tmp->rangeno;711 ibmphp_add_pfmem_from_mem(bus_pfmem[count]);712 func->pfmem[count] = bus_pfmem[count];713 } else {714 err("cannot allocate requested pfmem for bus %x, device %x, len %x\n",715 func->busno, func->device, len[count]);716 kfree(mem_tmp);717 kfree(bus_pfmem[count]);718 return -EIO;719 }720 }721 722 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);723 724 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {725 /* takes up another dword */726 count += 1;727 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */728 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);729 730 }731 } else {732 /* regular memory */733 len[count] = bar[count] & 0xFFFFFFF0;734 len[count] = ~len[count] + 1;735 736 debug("len[count] in Memory is %x\n", len[count]);737 738 bus_mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);739 if (!bus_mem[count]) {740 retval = -ENOMEM;741 goto error;742 }743 bus_mem[count]->type = MEM;744 bus_mem[count]->busno = func->busno;745 bus_mem[count]->devfunc = PCI_DEVFN(func->device,746 func->function);747 bus_mem[count]->len = len[count];748 if (ibmphp_check_resource(bus_mem[count], 0) == 0) {749 ibmphp_add_resource(bus_mem[count]);750 func->mem[count] = bus_mem[count];751 } else {752 err("cannot allocate requested mem for bus %x, device %x, len %x\n",753 func->busno, func->device, len[count]);754 kfree(bus_mem[count]);755 return -EIO;756 }757 758 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);759 760 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {761 /* takes up another dword */762 count += 1;763 /* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */764 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);765 766 }767 }768 } /* end of mem */769 } /* end of for */770 771 /* Now need to see how much space the devices behind the bridge needed */772 amount_needed = scan_behind_bridge(func, sec_number);773 if (amount_needed == NULL)774 return -ENOMEM;775 776 ibmphp_pci_bus->number = func->busno;777 debug("after coming back from scan_behind_bridge\n");778 debug("amount_needed->not_correct = %x\n", amount_needed->not_correct);779 debug("amount_needed->io = %x\n", amount_needed->io);780 debug("amount_needed->mem = %x\n", amount_needed->mem);781 debug("amount_needed->pfmem = %x\n", amount_needed->pfmem);782 783 if (amount_needed->not_correct) {784 debug("amount_needed is not correct\n");785 for (count = 0; address[count]; count++) {786 /* for 2 BARs */787 if (bus_io[count]) {788 ibmphp_remove_resource(bus_io[count]);789 func->io[count] = NULL;790 } else if (bus_pfmem[count]) {791 ibmphp_remove_resource(bus_pfmem[count]);792 func->pfmem[count] = NULL;793 } else if (bus_mem[count]) {794 ibmphp_remove_resource(bus_mem[count]);795 func->mem[count] = NULL;796 }797 }798 kfree(amount_needed);799 return -ENODEV;800 }801 802 if (!amount_needed->io) {803 debug("it doesn't want IO?\n");804 flag_io = 1;805 } else {806 debug("it wants %x IO behind the bridge\n", amount_needed->io);807 io = kzalloc(sizeof(*io), GFP_KERNEL);808 809 if (!io) {810 retval = -ENOMEM;811 goto error;812 }813 io->type = IO;814 io->busno = func->busno;815 io->devfunc = PCI_DEVFN(func->device, func->function);816 io->len = amount_needed->io;817 if (ibmphp_check_resource(io, 1) == 0) {818 debug("were we able to add io\n");819 ibmphp_add_resource(io);820 flag_io = 1;821 }822 }823 824 if (!amount_needed->mem) {825 debug("it doesn't want n.e.memory?\n");826 flag_mem = 1;827 } else {828 debug("it wants %x memory behind the bridge\n", amount_needed->mem);829 mem = kzalloc(sizeof(*mem), GFP_KERNEL);830 if (!mem) {831 retval = -ENOMEM;832 goto error;833 }834 mem->type = MEM;835 mem->busno = func->busno;836 mem->devfunc = PCI_DEVFN(func->device, func->function);837 mem->len = amount_needed->mem;838 if (ibmphp_check_resource(mem, 1) == 0) {839 ibmphp_add_resource(mem);840 flag_mem = 1;841 debug("were we able to add mem\n");842 }843 }844 845 if (!amount_needed->pfmem) {846 debug("it doesn't want n.e.pfmem mem?\n");847 flag_pfmem = 1;848 } else {849 debug("it wants %x pfmemory behind the bridge\n", amount_needed->pfmem);850 pfmem = kzalloc(sizeof(*pfmem), GFP_KERNEL);851 if (!pfmem) {852 retval = -ENOMEM;853 goto error;854 }855 pfmem->type = PFMEM;856 pfmem->busno = func->busno;857 pfmem->devfunc = PCI_DEVFN(func->device, func->function);858 pfmem->len = amount_needed->pfmem;859 pfmem->fromMem = 0;860 if (ibmphp_check_resource(pfmem, 1) == 0) {861 ibmphp_add_resource(pfmem);862 flag_pfmem = 1;863 } else {864 mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);865 if (!mem_tmp) {866 retval = -ENOMEM;867 goto error;868 }869 mem_tmp->type = MEM;870 mem_tmp->busno = pfmem->busno;871 mem_tmp->devfunc = pfmem->devfunc;872 mem_tmp->len = pfmem->len;873 if (ibmphp_check_resource(mem_tmp, 1) == 0) {874 ibmphp_add_resource(mem_tmp);875 pfmem->fromMem = 1;876 pfmem->rangeno = mem_tmp->rangeno;877 ibmphp_add_pfmem_from_mem(pfmem);878 flag_pfmem = 1;879 }880 }881 }882 883 debug("b4 if (flag_io && flag_mem && flag_pfmem)\n");884 debug("flag_io = %x, flag_mem = %x, flag_pfmem = %x\n", flag_io, flag_mem, flag_pfmem);885 886 if (flag_io && flag_mem && flag_pfmem) {887 /* If on bootup, there was a bridged card in this slot,888 * then card was removed and ibmphp got unloaded and loaded889 * back again, there's no way for us to remove the bus890 * struct, so no need to kmalloc, can use existing node891 */892 bus = ibmphp_find_res_bus(sec_number);893 if (!bus) {894 bus = kzalloc(sizeof(*bus), GFP_KERNEL);895 if (!bus) {896 retval = -ENOMEM;897 goto error;898 }899 bus->busno = sec_number;900 debug("b4 adding new bus\n");901 rc = add_new_bus(bus, io, mem, pfmem, func->busno);902 } else if (!(bus->rangeIO) && !(bus->rangeMem) && !(bus->rangePFMem))903 rc = add_new_bus(bus, io, mem, pfmem, 0xFF);904 else {905 err("expected bus structure not empty?\n");906 retval = -EIO;907 goto error;908 }909 if (rc) {910 if (rc == -ENOMEM) {911 ibmphp_remove_bus(bus, func->busno);912 kfree(amount_needed);913 return rc;914 }915 retval = rc;916 goto error;917 }918 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &io_base);919 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &pfmem_base);920 921 if ((io_base & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {922 debug("io 32\n");923 need_io_upper = 1;924 }925 if ((pfmem_base & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {926 debug("pfmem 64\n");927 need_pfmem_upper = 1;928 }929 930 if (bus->noIORanges) {931 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00 | bus->rangeIO->start >> 8);932 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00 | bus->rangeIO->end >> 8);933 934 /* _______________This is for debugging purposes only ____________________935 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &temp);936 debug("io_base = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);937 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, &temp);938 debug("io_limit = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);939 ________________________________________________________________________*/940 941 if (need_io_upper) { /* since can't support n.e.ways */942 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_BASE_UPPER16, 0x0000);943 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, 0x0000);944 }945 } else {946 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00);947 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00);948 }949 950 if (bus->noMemRanges) {951 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0x0000 | bus->rangeMem->start >> 16);952 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000 | bus->rangeMem->end >> 16);953 954 /* ____________________This is for debugging purposes only ________________________955 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, &temp);956 debug("mem_base = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);957 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, &temp);958 debug("mem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);959 __________________________________________________________________________________*/960 961 } else {962 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0xffff);963 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000);964 }965 if (bus->noPFMemRanges) {966 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0x0000 | bus->rangePFMem->start >> 16);967 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000 | bus->rangePFMem->end >> 16);968 969 /* __________________________This is for debugging purposes only _______________________970 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &temp);971 debug("pfmem_base = %x", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);972 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &temp);973 debug("pfmem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);974 ______________________________________________________________________________________*/975 976 if (need_pfmem_upper) { /* since can't support n.e.ways */977 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_BASE_UPPER32, 0x00000000);978 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_LIMIT_UPPER32, 0x00000000);979 }980 } else {981 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0xffff);982 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000);983 }984 985 debug("b4 writing control information\n");986 987 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);988 if ((irq > 0x00) && (irq < 0x05))989 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);990 /*991 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, ctrl);992 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_PARITY);993 pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_SERR);994 */995 996 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);997 pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, 0x07);998 for (i = 0; i < 32; i++) {999 if (amount_needed->devices[i]) {1000 debug("device where devices[i] is 1 = %x\n", i);1001 func->devices[i] = 1;1002 }1003 }1004 func->bus = 1; /* For unconfiguring, to indicate it's PPB */1005 func_passed = &func;1006 debug("func->busno b4 returning is %x\n", func->busno);1007 debug("func->busno b4 returning in the other structure is %x\n", (*func_passed)->busno);1008 kfree(amount_needed);1009 return 0;1010 } else {1011 err("Configuring bridge was unsuccessful...\n");1012 mem_tmp = NULL;1013 retval = -EIO;1014 goto error;1015 }1016 1017error:1018 kfree(amount_needed);1019 if (pfmem)1020 ibmphp_remove_resource(pfmem);1021 if (io)1022 ibmphp_remove_resource(io);1023 if (mem)1024 ibmphp_remove_resource(mem);1025 for (i = 0; i < 2; i++) { /* for 2 BARs */1026 if (bus_io[i]) {1027 ibmphp_remove_resource(bus_io[i]);1028 func->io[i] = NULL;1029 } else if (bus_pfmem[i]) {1030 ibmphp_remove_resource(bus_pfmem[i]);1031 func->pfmem[i] = NULL;1032 } else if (bus_mem[i]) {1033 ibmphp_remove_resource(bus_mem[i]);1034 func->mem[i] = NULL;1035 }1036 }1037 return retval;1038}1039 1040/*****************************************************************************1041 * This function adds up the amount of resources needed behind the PPB bridge1042 * and passes it to the configure_bridge function1043 * Input: bridge function1044 * Output: amount of resources needed1045 *****************************************************************************/1046static struct res_needed *scan_behind_bridge(struct pci_func *func, u8 busno)1047{1048 int count, len[6];1049 u16 vendor_id;1050 u8 hdr_type;1051 u8 device, function;1052 unsigned int devfn;1053 int howmany = 0; /*this is to see if there are any devices behind the bridge */1054 1055 u32 bar[6], class;1056 static const u32 address[] = {1057 PCI_BASE_ADDRESS_0,1058 PCI_BASE_ADDRESS_1,1059 PCI_BASE_ADDRESS_2,1060 PCI_BASE_ADDRESS_3,1061 PCI_BASE_ADDRESS_4,1062 PCI_BASE_ADDRESS_5,1063 01064 };1065 struct res_needed *amount;1066 1067 amount = kzalloc(sizeof(*amount), GFP_KERNEL);1068 if (amount == NULL)1069 return NULL;1070 1071 ibmphp_pci_bus->number = busno;1072 1073 debug("the bus_no behind the bridge is %x\n", busno);1074 debug("scanning devices behind the bridge...\n");1075 for (device = 0; device < 32; device++) {1076 amount->devices[device] = 0;1077 for (function = 0; function < 8; function++) {1078 devfn = PCI_DEVFN(device, function);1079 1080 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);1081 1082 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {1083 /* found correct device!!! */1084 howmany++;1085 1086 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);1087 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);1088 1089 debug("hdr_type behind the bridge is %x\n", hdr_type);1090 if ((hdr_type & PCI_HEADER_TYPE_MASK) == PCI_HEADER_TYPE_BRIDGE) {1091 err("embedded bridges not supported for hot-plugging.\n");1092 amount->not_correct = 1;1093 return amount;1094 }1095 1096 class >>= 8; /* to take revision out, class = class.subclass.prog i/f */1097 if (class == PCI_CLASS_NOT_DEFINED_VGA) {1098 err("The device %x is VGA compatible and as is not supported for hot plugging. Please choose another device.\n", device);1099 amount->not_correct = 1;1100 return amount;1101 } else if (class == PCI_CLASS_DISPLAY_VGA) {1102 err("The device %x is not supported for hot plugging. Please choose another device.\n", device);1103 amount->not_correct = 1;1104 return amount;1105 }1106 1107 amount->devices[device] = 1;1108 1109 for (count = 0; address[count]; count++) {1110 /* for 6 BARs */1111 /*1112 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, address[count], &tmp);1113 if (tmp & 0x01) // IO1114 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFD);1115 else // MEMORY1116 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);1117 */1118 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);1119 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);1120 1121 debug("what is bar[count]? %x, count = %d\n", bar[count], count);1122 1123 if (!bar[count]) /* This BAR is not implemented */1124 continue;1125 1126 //tmp_bar = bar[count];1127 1128 debug("count %d device %x function %x wants %x resources\n", count, device, function, bar[count]);1129 1130 if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {1131 /* This is IO */1132 len[count] = bar[count] & 0xFFFFFFFC;1133 len[count] = ~len[count] + 1;1134 amount->io += len[count];1135 } else {1136 /* This is Memory */1137 if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {1138 /* pfmem */1139 len[count] = bar[count] & 0xFFFFFFF0;1140 len[count] = ~len[count] + 1;1141 amount->pfmem += len[count];1142 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64)1143 /* takes up another dword */1144 count += 1;1145 1146 } else {1147 /* regular memory */1148 len[count] = bar[count] & 0xFFFFFFF0;1149 len[count] = ~len[count] + 1;1150 amount->mem += len[count];1151 if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {1152 /* takes up another dword */1153 count += 1;1154 }1155 }1156 }1157 } /* end for */1158 } /* end if (valid) */1159 } /* end for */1160 } /* end for */1161 1162 if (!howmany)1163 amount->not_correct = 1;1164 else1165 amount->not_correct = 0;1166 if ((amount->io) && (amount->io < IOBRIDGE))1167 amount->io = IOBRIDGE;1168 if ((amount->mem) && (amount->mem < MEMBRIDGE))1169 amount->mem = MEMBRIDGE;1170 if ((amount->pfmem) && (amount->pfmem < MEMBRIDGE))1171 amount->pfmem = MEMBRIDGE;1172 return amount;1173}1174 1175/* The following 3 unconfigure_boot_ routines deal with the case when we had the card1176 * upon bootup in the system, since we don't allocate func to such case, we need to read1177 * the start addresses from pci config space and then find the corresponding entries in1178 * our resource lists. The functions return either 0, -ENODEV, or -1 (general failure)1179 * Change: we also call these functions even if we configured the card ourselves (i.e., not1180 * the bootup case), since it should work same way1181 */1182static int unconfigure_boot_device(u8 busno, u8 device, u8 function)1183{1184 u32 start_address;1185 static const u32 address[] = {1186 PCI_BASE_ADDRESS_0,1187 PCI_BASE_ADDRESS_1,1188 PCI_BASE_ADDRESS_2,1189 PCI_BASE_ADDRESS_3,1190 PCI_BASE_ADDRESS_4,1191 PCI_BASE_ADDRESS_5,1192 01193 };1194 int count;1195 struct resource_node *io;1196 struct resource_node *mem;1197 struct resource_node *pfmem;1198 struct bus_node *bus;1199 u32 end_address;1200 u32 temp_end;1201 u32 size;1202 u32 tmp_address;1203 unsigned int devfn;1204 1205 debug("%s - enter\n", __func__);1206 1207 bus = ibmphp_find_res_bus(busno);1208 if (!bus) {1209 debug("cannot find corresponding bus.\n");1210 return -EINVAL;1211 }1212 1213 devfn = PCI_DEVFN(device, function);1214 ibmphp_pci_bus->number = busno;1215 for (count = 0; address[count]; count++) { /* for 6 BARs */1216 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address);1217 1218 /* We can do this here, b/c by that time the device driver of the card has been stopped */1219 1220 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);1221 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &size);1222 pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], start_address);1223 1224 debug("start_address is %x\n", start_address);1225 debug("busno, device, function %x %x %x\n", busno, device, function);1226 if (!size) {1227 /* This BAR is not implemented */1228 debug("is this bar no implemented?, count = %d\n", count);1229 continue;1230 }1231 tmp_address = start_address;1232 if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {1233 /* This is IO */1234 start_address &= PCI_BASE_ADDRESS_IO_MASK;1235 size = size & 0xFFFFFFFC;1236 size = ~size + 1;1237 end_address = start_address + size - 1;1238 if (ibmphp_find_resource(bus, start_address, &io, IO))1239 goto report_search_failure;1240 1241 debug("io->start = %x\n", io->start);1242 temp_end = io->end;1243 start_address = io->end + 1;1244 ibmphp_remove_resource(io);1245 /* This is needed b/c of the old I/O restrictions in the BIOS */1246 while (temp_end < end_address) {1247 if (ibmphp_find_resource(bus, start_address,1248 &io, IO))1249 goto report_search_failure;1250 1251 debug("io->start = %x\n", io->start);1252 temp_end = io->end;1253 start_address = io->end + 1;1254 ibmphp_remove_resource(io);1255 }1256 1257 /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */1258 } else {1259 /* This is Memory */1260 if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {1261 /* pfmem */1262 debug("start address of pfmem is %x\n", start_address);1263 start_address &= PCI_BASE_ADDRESS_MEM_MASK;1264 1265 if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) {1266 err("cannot find corresponding PFMEM resource to remove\n");1267 return -EIO;1268 }1269 if (pfmem) {1270 debug("pfmem->start = %x\n", pfmem->start);1271 1272 ibmphp_remove_resource(pfmem);1273 }1274 } else {1275 /* regular memory */1276 debug("start address of mem is %x\n", start_address);1277 start_address &= PCI_BASE_ADDRESS_MEM_MASK;1278 1279 if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) {1280 err("cannot find corresponding MEM resource to remove\n");1281 return -EIO;1282 }1283 if (mem) {1284 debug("mem->start = %x\n", mem->start);1285 1286 ibmphp_remove_resource(mem);1287 }1288 }1289 if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {1290 /* takes up another dword */1291 count += 1;1292 }1293 } /* end of mem */1294 } /* end of for */1295 1296 return 0;1297 1298report_search_failure:1299 err("cannot find corresponding IO resource to remove\n");1300 return -EIO;1301}1302 1303static int unconfigure_boot_bridge(u8 busno, u8 device, u8 function)1304{1305 int count;1306 int bus_no, pri_no, sub_no, sec_no = 0;1307 u32 start_address, tmp_address;1308 u8 sec_number, sub_number, pri_number;1309 struct resource_node *io = NULL;1310 struct resource_node *mem = NULL;1311 struct resource_node *pfmem = NULL;1312 struct bus_node *bus;1313 static const u32 address[] = {1314 PCI_BASE_ADDRESS_0,1315 PCI_BASE_ADDRESS_1,1316 01317 };1318 unsigned int devfn;1319 1320 devfn = PCI_DEVFN(device, function);1321 ibmphp_pci_bus->number = busno;1322 bus_no = (int) busno;1323 debug("busno is %x\n", busno);1324 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);1325 debug("%s - busno = %x, primary_number = %x\n", __func__, busno, pri_number);1326 1327 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);1328 debug("sec_number is %x\n", sec_number);1329 sec_no = (int) sec_number;1330 pri_no = (int) pri_number;1331 if (pri_no != bus_no) {1332 err("primary numbers in our structures and pci config space don't match.\n");1333 return -EINVAL;1334 }1335 1336 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sub_number);1337 sub_no = (int) sub_number;1338 debug("sub_no is %d, sec_no is %d\n", sub_no, sec_no);1339 if (sec_no != sub_number) {1340 err("there're more buses behind this bridge. Hot removal is not supported. Please choose another card\n");1341 return -ENODEV;1342 }1343 1344 bus = ibmphp_find_res_bus(sec_number);1345 if (!bus) {1346 err("cannot find Bus structure for the bridged device\n");1347 return -EINVAL;1348 }1349 debug("bus->busno is %x\n", bus->busno);1350 debug("sec_number is %x\n", sec_number);1351 1352 ibmphp_remove_bus(bus, busno);1353 1354 for (count = 0; address[count]; count++) {1355 /* for 2 BARs */1356 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address);1357 1358 if (!start_address) {1359 /* This BAR is not implemented */1360 continue;1361 }1362 1363 tmp_address = start_address;1364 1365 if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {1366 /* This is IO */1367 start_address &= PCI_BASE_ADDRESS_IO_MASK;1368 if (ibmphp_find_resource(bus, start_address, &io, IO) < 0) {1369 err("cannot find corresponding IO resource to remove\n");1370 return -EIO;1371 }1372 if (io)1373 debug("io->start = %x\n", io->start);1374 1375 ibmphp_remove_resource(io);1376 1377 /* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */1378 } else {1379 /* This is Memory */1380 if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {1381 /* pfmem */1382 start_address &= PCI_BASE_ADDRESS_MEM_MASK;1383 if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) {1384 err("cannot find corresponding PFMEM resource to remove\n");1385 return -EINVAL;1386 }1387 if (pfmem) {1388 debug("pfmem->start = %x\n", pfmem->start);1389 1390 ibmphp_remove_resource(pfmem);1391 }1392 } else {1393 /* regular memory */1394 start_address &= PCI_BASE_ADDRESS_MEM_MASK;1395 if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) {1396 err("cannot find corresponding MEM resource to remove\n");1397 return -EINVAL;1398 }1399 if (mem) {1400 debug("mem->start = %x\n", mem->start);1401 1402 ibmphp_remove_resource(mem);1403 }1404 }1405 if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {1406 /* takes up another dword */1407 count += 1;1408 }1409 } /* end of mem */1410 } /* end of for */1411 debug("%s - exiting, returning success\n", __func__);1412 return 0;1413}1414 1415static int unconfigure_boot_card(struct slot *slot_cur)1416{1417 u16 vendor_id;1418 u32 class;1419 u8 hdr_type;1420 u8 device;1421 u8 busno;1422 u8 function;1423 int rc;1424 unsigned int devfn;1425 u8 valid_device = 0x00; /* To see if we are ever able to find valid device and read it */1426 1427 debug("%s - enter\n", __func__);1428 1429 device = slot_cur->device;1430 busno = slot_cur->bus;1431 1432 debug("b4 for loop, device is %x\n", device);1433 /* For every function on the card */1434 for (function = 0x0; function < 0x08; function++) {1435 devfn = PCI_DEVFN(device, function);1436 ibmphp_pci_bus->number = busno;1437 1438 pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);1439 1440 if (vendor_id != PCI_VENDOR_ID_NOTVALID) {1441 /* found correct device!!! */1442 ++valid_device;1443 1444 debug("%s - found correct device\n", __func__);1445 1446 /* header: x x x x x x x x1447 * | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge1448 * |_=> 0 = single function device, 1 = multi-function device1449 */1450 1451 pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);1452 pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);1453 1454 debug("hdr_type %x, class %x\n", hdr_type, class);1455 class >>= 8; /* to take revision out, class = class.subclass.prog i/f */1456 if (class == PCI_CLASS_NOT_DEFINED_VGA) {1457 err("The device %x function %x is VGA compatible and is not supported for hot removing. Please choose another device.\n", device, function);1458 return -ENODEV;1459 } else if (class == PCI_CLASS_DISPLAY_VGA) {1460 err("The device %x function %x is not supported for hot removing. Please choose another device.\n", device, function);1461 return -ENODEV;1462 }1463 1464 switch (hdr_type) {1465 case PCI_HEADER_TYPE_NORMAL:1466 rc = unconfigure_boot_device(busno, device, function);1467 if (rc) {1468 err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",1469 device, function, busno);1470 return rc;1471 }1472 function = 0x8;1473 break;1474 case PCI_HEADER_TYPE_MULTIDEVICE:1475 rc = unconfigure_boot_device(busno, device, function);1476 if (rc) {1477 err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",1478 device, function, busno);1479 return rc;1480 }1481 break;1482 case PCI_HEADER_TYPE_BRIDGE:1483 class >>= 8;1484 if (class != PCI_CLASS_BRIDGE_PCI) {1485 err("This device %x function %x is not PCI-to-PCI bridge, and is not supported for hot-removing. Please try another card.\n", device, function);1486 return -ENODEV;1487 }1488 rc = unconfigure_boot_bridge(busno, device, function);1489 if (rc != 0) {1490 err("was not able to hot-remove PPB properly.\n");1491 return rc;1492 }1493 1494 function = 0x8;1495 break;1496 case PCI_HEADER_TYPE_MULTIBRIDGE:1497 class >>= 8;1498 if (class != PCI_CLASS_BRIDGE_PCI) {1499 err("This device %x function %x is not PCI-to-PCI bridge, and is not supported for hot-removing. Please try another card.\n", device, function);1500 return -ENODEV;1501 }1502 rc = unconfigure_boot_bridge(busno, device, function);1503 if (rc != 0) {1504 err("was not able to hot-remove PPB properly.\n");1505 return rc;1506 }1507 break;1508 default:1509 err("MAJOR PROBLEM!!!! Cannot read device's header\n");1510 return -1;1511 } /* end of switch */1512 } /* end of valid device */1513 } /* end of for */1514 1515 if (!valid_device) {1516 err("Could not find device to unconfigure. Or could not read the card.\n");1517 return -1;1518 }1519 return 0;1520}1521 1522/*1523 * free the resources of the card (multi, single, or bridged)1524 * Parameters: slot, flag to say if this is for removing entire module or just1525 * unconfiguring the device1526 * TO DO: will probably need to add some code in case there was some resource,1527 * to remove it... this is from when we have errors in the configure_card...1528 * !!!!!!!!!!!!!!!!!!!!!!!!!FOR BUSES!!!!!!!!!!!!1529 * Returns: 0, -1, -ENODEV1530 */1531int ibmphp_unconfigure_card(struct slot **slot_cur, int the_end)1532{1533 int i;1534 int count;1535 int rc;1536 struct slot *sl = *slot_cur;1537 struct pci_func *cur_func = NULL;1538 struct pci_func *temp_func;1539 1540 debug("%s - enter\n", __func__);1541 1542 if (!the_end) {1543 /* Need to unconfigure the card */1544 rc = unconfigure_boot_card(sl);1545 if ((rc == -ENODEV) || (rc == -EIO) || (rc == -EINVAL)) {1546 /* In all other cases, will still need to get rid of func structure if it exists */1547 return rc;1548 }1549 }1550 1551 if (sl->func) {1552 cur_func = sl->func;1553 while (cur_func) {1554 /* TO DO: WILL MOST LIKELY NEED TO GET RID OF THE BUS STRUCTURE FROM RESOURCES AS WELL */1555 if (cur_func->bus) {1556 /* in other words, it's a PPB */1557 count = 2;1558 } else {1559 count = 6;1560 }1561 1562 for (i = 0; i < count; i++) {1563 if (cur_func->io[i]) {1564 debug("io[%d] exists\n", i);1565 if (the_end > 0)1566 ibmphp_remove_resource(cur_func->io[i]);1567 cur_func->io[i] = NULL;1568 }1569 if (cur_func->mem[i]) {1570 debug("mem[%d] exists\n", i);1571 if (the_end > 0)1572 ibmphp_remove_resource(cur_func->mem[i]);1573 cur_func->mem[i] = NULL;1574 }1575 if (cur_func->pfmem[i]) {1576 debug("pfmem[%d] exists\n", i);1577 if (the_end > 0)1578 ibmphp_remove_resource(cur_func->pfmem[i]);1579 cur_func->pfmem[i] = NULL;1580 }1581 }1582 1583 temp_func = cur_func->next;1584 kfree(cur_func);1585 cur_func = temp_func;1586 }1587 }1588 1589 sl->func = NULL;1590 *slot_cur = sl;1591 debug("%s - exit\n", __func__);1592 return 0;1593}1594 1595/*1596 * add a new bus resulting from hot-plugging a PPB bridge with devices1597 *1598 * Input: bus and the amount of resources needed (we know we can assign those,1599 * since they've been checked already1600 * Output: bus added to the correct spot1601 * 0, -1, error1602 */1603static int add_new_bus(struct bus_node *bus, struct resource_node *io, struct resource_node *mem, struct resource_node *pfmem, u8 parent_busno)1604{1605 struct range_node *io_range = NULL;1606 struct range_node *mem_range = NULL;1607 struct range_node *pfmem_range = NULL;1608 struct bus_node *cur_bus = NULL;1609 1610 /* Trying to find the parent bus number */1611 if (parent_busno != 0xFF) {1612 cur_bus = ibmphp_find_res_bus(parent_busno);1613 if (!cur_bus) {1614 err("strange, cannot find bus which is supposed to be at the system... something is terribly wrong...\n");1615 return -ENODEV;1616 }1617 1618 list_add(&bus->bus_list, &cur_bus->bus_list);1619 }1620 if (io) {1621 io_range = kzalloc(sizeof(*io_range), GFP_KERNEL);1622 if (!io_range)1623 return -ENOMEM;1624 1625 io_range->start = io->start;1626 io_range->end = io->end;1627 io_range->rangeno = 1;1628 bus->noIORanges = 1;1629 bus->rangeIO = io_range;1630 }1631 if (mem) {1632 mem_range = kzalloc(sizeof(*mem_range), GFP_KERNEL);1633 if (!mem_range)1634 return -ENOMEM;1635 1636 mem_range->start = mem->start;1637 mem_range->end = mem->end;1638 mem_range->rangeno = 1;1639 bus->noMemRanges = 1;1640 bus->rangeMem = mem_range;1641 }1642 if (pfmem) {1643 pfmem_range = kzalloc(sizeof(*pfmem_range), GFP_KERNEL);1644 if (!pfmem_range)1645 return -ENOMEM;1646 1647 pfmem_range->start = pfmem->start;1648 pfmem_range->end = pfmem->end;1649 pfmem_range->rangeno = 1;1650 bus->noPFMemRanges = 1;1651 bus->rangePFMem = pfmem_range;1652 }1653 return 0;1654}1655 1656/*1657 * find the 1st available bus number for PPB to set as its secondary bus1658 * Parameters: bus_number of the primary bus1659 * Returns: bus_number of the secondary bus or 0xff in case of failure1660 */1661static u8 find_sec_number(u8 primary_busno, u8 slotno)1662{1663 int min, max;1664 u8 busno;1665 struct bus_info *bus;1666 struct bus_node *bus_cur;1667 1668 bus = ibmphp_find_same_bus_num(primary_busno);1669 if (!bus) {1670 err("cannot get slot range of the bus from the BIOS\n");1671 return 0xff;1672 }1673 max = bus->slot_max;1674 min = bus->slot_min;1675 if ((slotno > max) || (slotno < min)) {1676 err("got the wrong range\n");1677 return 0xff;1678 }1679 busno = (u8) (slotno - (u8) min);1680 busno += primary_busno + 0x01;1681 bus_cur = ibmphp_find_res_bus(busno);1682 /* either there is no such bus number, or there are no ranges, which1683 * can only happen if we removed the bridged device in previous load1684 * of the driver, and now only have the skeleton bus struct1685 */1686 if ((!bus_cur) || (!(bus_cur->rangeIO) && !(bus_cur->rangeMem) && !(bus_cur->rangePFMem)))1687 return busno;1688 return 0xff;1689}1690