drivers/pci/hotplug/shpchprm_nonacpi.c

   1 /*
   2  * SHPCHPRM NONACPI: PHP Resource Manager for Non-ACPI/Legacy platform
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   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 <greg@kroah.com>, <kristen.c.accardi@intel.com>
  27  *
  28  */
  29
  30 #include <linux/config.h>
  31 #include <linux/module.h>
  32 #include <linux/kernel.h>
  33 #include <linux/types.h>
  34 #include <linux/pci.h>
  35 #include <linux/init.h>
  36 #include <asm/uaccess.h>
  37 #ifdef CONFIG_IA64
  38 #include <asm/iosapic.h>
  39 #endif
  40 #include "shpchp.h"
  41 #include "shpchprm.h"
  42 #include "shpchprm_nonacpi.h"
  43
  44 void shpchprm_cleanup(void)
  45 {
  46         return;
  47 }
  48
  49 int shpchprm_print_pirt(void)
  50 {
  51         return 0;
  52 }
  53
  54 int shpchprm_get_physical_slot_number(struct controller *ctrl, u32 *sun, u8 busnum, u8 devnum)
  55 {
  56         int     offset = devnum - ctrl->slot_device_offset;
  57
  58         dbg("%s: ctrl->slot_num_inc %d, offset %d\n", __FUNCTION__, ctrl->slot_num_inc, offset);
  59         *sun = (u8) (ctrl->first_slot + ctrl->slot_num_inc * offset);
  60         return 0;
  61 }
  62
  63 static void print_pci_resource ( struct pci_resource    *aprh)
  64 {
  65         struct pci_resource     *res;
  66
  67         for (res = aprh; res; res = res->next)
  68                 dbg("        base= 0x%x length= 0x%x\n", res->base, res->length);
  69 }
  70
  71
  72 static void phprm_dump_func_res( struct pci_func *fun)
  73 {
  74         struct pci_func *func = fun;
  75
  76         if (func->bus_head) {
  77                 dbg(":    BUS Resources:\n");
  78                 print_pci_resource (func->bus_head);
  79         }
  80         if (func->io_head) {
  81                 dbg(":    IO Resources:\n");
  82                 print_pci_resource (func->io_head);
  83         }
  84         if (func->mem_head) {
  85                 dbg(":    MEM Resources:\n");
  86                 print_pci_resource (func->mem_head);
  87         }
  88         if (func->p_mem_head) {
  89                 dbg(":    PMEM Resources:\n");
  90                 print_pci_resource (func->p_mem_head);
  91         }
  92 }
  93
  94 static int phprm_get_used_resources (
  95         struct controller *ctrl,
  96         struct pci_func *func
  97         )
  98 {
  99         return shpchp_save_used_resources (ctrl, func, !DISABLE_CARD);
 100 }
 101
 102 static int phprm_delete_resource(
 103         struct pci_resource **aprh,
 104         ulong base,
 105         ulong size)
 106 {
 107         struct pci_resource *res;
 108         struct pci_resource *prevnode;
 109         struct pci_resource *split_node;
 110         ulong tbase;
 111
 112         shpchp_resource_sort_and_combine(aprh);
 113
 114         for (res = *aprh; res; res = res->next) {
 115                 if (res->base > base)
 116                         continue;
 117
 118                 if ((res->base + res->length) < (base + size))
 119                         continue;
 120
 121                 if (res->base < base) {
 122                         tbase = base;
 123
 124                         if ((res->length - (tbase - res->base)) < size)
 125                                 continue;
 126
 127                         split_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 128                         if (!split_node)
 129                                 return -ENOMEM;
 130
 131                         split_node->base = res->base;
 132                         split_node->length = tbase - res->base;
 133                         res->base = tbase;
 134                         res->length -= split_node->length;
 135
 136                         split_node->next = res->next;
 137                         res->next = split_node;
 138                 }
 139
 140                 if (res->length >= size) {
 141                         split_node = (struct pci_resource*) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 142                         if (!split_node)
 143                                 return -ENOMEM;
 144
 145                         split_node->base = res->base + size;
 146                         split_node->length = res->length - size;
 147                         res->length = size;
 148
 149                         split_node->next = res->next;
 150                         res->next = split_node;
 151                 }
 152
 153                 if (*aprh == res) {
 154                         *aprh = res->next;
 155                 } else {
 156                         prevnode = *aprh;
 157                         while (prevnode->next != res)
 158                                 prevnode = prevnode->next;
 159
 160                         prevnode->next = res->next;
 161                 }
 162                 res->next = NULL;
 163                 kfree(res);
 164                 break;
 165         }
 166
 167         return 0;
 168 }
 169
 170
 171 static int phprm_delete_resources(
 172         struct pci_resource **aprh,
 173         struct pci_resource *this
 174         )
 175 {
 176         struct pci_resource *res;
 177
 178         for (res = this; res; res = res->next)
 179                 phprm_delete_resource(aprh, res->base, res->length);
 180
 181         return 0;
 182 }
 183
 184
 185 static int configure_existing_function(
 186         struct controller *ctrl,
 187         struct pci_func *func
 188         )
 189 {
 190         int rc;
 191
 192         /* see how much resources the func has used. */
 193         rc = phprm_get_used_resources (ctrl, func);
 194
 195         if (!rc) {
 196                 /* subtract the resources used by the func from ctrl resources */
 197                 rc  = phprm_delete_resources (&ctrl->bus_head, func->bus_head);
 198                 rc |= phprm_delete_resources (&ctrl->io_head, func->io_head);
 199                 rc |= phprm_delete_resources (&ctrl->mem_head, func->mem_head);
 200                 rc |= phprm_delete_resources (&ctrl->p_mem_head, func->p_mem_head);
 201                 if (rc)
 202                         warn("aCEF: cannot del used resources\n");
 203         } else
 204                 err("aCEF: cannot get used resources\n");
 205
 206         return rc;
 207 }
 208
 209 static int bind_pci_resources_to_slots ( struct controller *ctrl)
 210 {
 211         struct pci_func *func, new_func;
 212         int busn = ctrl->slot_bus;
 213         int devn, funn;
 214         u32     vid;
 215
 216         for (devn = 0; devn < 32; devn++) {
 217                 for (funn = 0; funn < 8; funn++) {
 218                         /*
 219                         if (devn == ctrl->device && funn == ctrl->function)
 220                                 continue;
 221                          */
 222                         /* find out if this entry is for an occupied slot */
 223                         vid = 0xFFFFFFFF;
 224
 225                         pci_bus_read_config_dword(ctrl->pci_dev->subordinate, PCI_DEVFN(devn, funn), PCI_VENDOR_ID, &vid);
 226
 227                         if (vid != 0xFFFFFFFF) {
 228                                 func = shpchp_slot_find(busn, devn, funn);
 229                                 if (!func) {
 230                                         memset(&new_func, 0, sizeof(struct pci_func));
 231                                         new_func.bus = busn;
 232                                         new_func.device = devn;
 233                                         new_func.function = funn;
 234                                         new_func.is_a_board = 1;
 235                                         configure_existing_function(ctrl, &new_func);
 236                                         phprm_dump_func_res(&new_func);
 237                                 } else {
 238                                         configure_existing_function(ctrl, func);
 239                                         phprm_dump_func_res(func);
 240                                 }
 241                                 dbg("aCCF:existing PCI 0x%x Func ResourceDump\n", ctrl->bus);
 242                         }
 243                 }
 244         }
 245
 246         return 0;
 247 }
 248
 249 static void phprm_dump_ctrl_res( struct controller *ctlr)
 250 {
 251         struct controller *ctrl = ctlr;
 252
 253         if (ctrl->bus_head) {
 254                 dbg(":    BUS Resources:\n");
 255                 print_pci_resource (ctrl->bus_head);
 256         }
 257         if (ctrl->io_head) {
 258                 dbg(":    IO Resources:\n");
 259                 print_pci_resource (ctrl->io_head);
 260         }
 261         if (ctrl->mem_head) {
 262                 dbg(":    MEM Resources:\n");
 263                 print_pci_resource (ctrl->mem_head);
 264         }
 265         if (ctrl->p_mem_head) {
 266                 dbg(":    PMEM Resources:\n");
 267                 print_pci_resource (ctrl->p_mem_head);
 268         }
 269 }
 270
 271 /*
 272  * phprm_find_available_resources
 273  *
 274  *  Finds available memory, IO, and IRQ resources for programming
 275  *  devices which may be added to the system
 276  *  this function is for hot plug ADD!
 277  *
 278  * returns 0 if success
 279  */
 280 int shpchprm_find_available_resources(struct controller *ctrl)
 281 {
 282         struct pci_func func;
 283         u32 rc;
 284
 285         memset(&func, 0, sizeof(struct pci_func));
 286
 287         func.bus = ctrl->bus;
 288         func.device = ctrl->device;
 289         func.function = ctrl->function;
 290         func.is_a_board = 1;
 291
 292         /* Get resources for this PCI bridge */
 293         rc = shpchp_save_used_resources (ctrl, &func, !DISABLE_CARD);
 294         dbg("%s: shpchp_save_used_resources rc = %d\n", __FUNCTION__, rc);
 295
 296         if (func.mem_head)
 297                 func.mem_head->next = ctrl->mem_head;
 298         ctrl->mem_head = func.mem_head;
 299
 300         if (func.p_mem_head)
 301                 func.p_mem_head->next = ctrl->p_mem_head;
 302         ctrl->p_mem_head = func.p_mem_head;
 303
 304         if (func.io_head)
 305                 func.io_head->next = ctrl->io_head;
 306         ctrl->io_head = func.io_head;
 307
 308         if(func.bus_head)
 309                 func.bus_head->next = ctrl->bus_head;
 310         ctrl->bus_head = func.bus_head;
 311         if (ctrl->bus_head)
 312                 phprm_delete_resource(&ctrl->bus_head, ctrl->pci_dev->subordinate->number, 1);
 313
 314         dbg("%s:pre-Bind PCI 0x%x Ctrl Resource Dump\n", __FUNCTION__, ctrl->bus);
 315         phprm_dump_ctrl_res(ctrl);
 316         bind_pci_resources_to_slots (ctrl);
 317
 318         dbg("%s:post-Bind PCI 0x%x Ctrl Resource Dump\n", __FUNCTION__, ctrl->bus);
 319         phprm_dump_ctrl_res(ctrl);
 320
 321
 322         /* If all of the following fail, we don't have any resources for hot plug add */
 323         rc = 1;
 324         rc &= shpchp_resource_sort_and_combine(&(ctrl->mem_head));
 325         rc &= shpchp_resource_sort_and_combine(&(ctrl->p_mem_head));
 326         rc &= shpchp_resource_sort_and_combine(&(ctrl->io_head));
 327         rc &= shpchp_resource_sort_and_combine(&(ctrl->bus_head));
 328
 329         return (rc);
 330 }
 331
 332 int shpchprm_set_hpp(
 333         struct controller *ctrl,
 334         struct pci_func *func,
 335         u8      card_type)
 336 {
 337         u32 rc;
 338         u8 temp_byte;
 339         struct pci_bus lpci_bus, *pci_bus;
 340         unsigned int    devfn;
 341         memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
 342         pci_bus = &lpci_bus;
 343         pci_bus->number = func->bus;
 344         devfn = PCI_DEVFN(func->device, func->function);
 345
 346         temp_byte = 0x40;       /* hard coded value for LT */
 347         if (card_type == PCI_HEADER_TYPE_BRIDGE) {
 348                 /* set subordinate Latency Timer */
 349                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SEC_LATENCY_TIMER, temp_byte);
 350
 351                 if (rc) {
 352                         dbg("%s: set secondary LT error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus,
 353                                 func->device, func->function);
 354                         return rc;
 355                 }
 356         }
 357
 358         /* set base Latency Timer */
 359         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_LATENCY_TIMER, temp_byte);
 360
 361         if (rc) {
 362                 dbg("%s: set LT error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, func->device, func->function);
 363                 return rc;
 364         }
 365
 366         /* set Cache Line size */
 367         temp_byte = 0x08;       /* hard coded value for CLS */
 368
 369         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_CACHE_LINE_SIZE, temp_byte);
 370
 371         if (rc) {
 372                 dbg("%s: set CLS error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, func->device, func->function);
 373         }
 374
 375         /* set enable_perr */
 376         /* set enable_serr */
 377
 378         return rc;
 379 }
 380
 381 void shpchprm_enable_card(
 382         struct controller *ctrl,
 383         struct pci_func *func,
 384         u8 card_type)
 385 {
 386         u16 command, bcommand;
 387         struct pci_bus lpci_bus, *pci_bus;
 388         unsigned int devfn;
 389         int rc;
 390
 391         memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
 392         pci_bus = &lpci_bus;
 393         pci_bus->number = func->bus;
 394         devfn = PCI_DEVFN(func->device, func->function);
 395
 396         rc = pci_bus_read_config_word(pci_bus, devfn, PCI_COMMAND, &command);
 397
 398         command |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR
 399                 | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
 400                 | PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
 401
 402         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_COMMAND, command);
 403
 404         if (card_type == PCI_HEADER_TYPE_BRIDGE) {
 405
 406                 rc = pci_bus_read_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, &bcommand);
 407
 408                 bcommand |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR
 409                         | PCI_BRIDGE_CTL_NO_ISA;
 410
 411                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, bcommand);
 412         }
 413 }
 414
 415 static int legacy_shpchprm_init_pci(void)
 416 {
 417         return 0;
 418 }
 419
 420 int shpchprm_init(enum php_ctlr_type ctrl_type)
 421 {
 422         int retval;
 423
 424         switch (ctrl_type) {
 425         case PCI:
 426                 retval = legacy_shpchprm_init_pci();
 427                 break;
 428         default:
 429                 retval = -ENODEV;
 430                 break;
 431         }
 432
 433         return retval;
 434 }