drivers/pci/hotplug/shpchprm_legacy.c

   1 /*
   2  * SHPCHPRM Legacy: 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_legacy.h"
  43
  44 static void __iomem *shpchp_rom_start;
  45 static u16 unused_IRQ;
  46
  47 void shpchprm_cleanup(void)
  48 {
  49         if (shpchp_rom_start)
  50                 iounmap(shpchp_rom_start);
  51 }
  52
  53 int shpchprm_print_pirt(void)
  54 {
  55         return 0;
  56 }
  57
  58 int shpchprm_get_physical_slot_number(struct controller *ctrl, u32 *sun, u8 busnum, u8 devnum)
  59 {
  60         int     offset = devnum - ctrl->slot_device_offset;
  61
  62         *sun = (u8) (ctrl->first_slot + ctrl->slot_num_inc * offset);
  63         return 0;
  64 }
  65
  66 /* Find the Hot Plug Resource Table in the specified region of memory */
  67 static void __iomem *detect_HRT_floating_pointer(void __iomem *begin, void __iomem *end)
  68 {
  69         void __iomem *fp;
  70         void __iomem *endp;
  71         u8 temp1, temp2, temp3, temp4;
  72         int status = 0;
  73
  74         endp = (end - sizeof(struct hrt) + 1);
  75
  76         for (fp = begin; fp <= endp; fp += 16) {
  77                 temp1 = readb(fp + SIG0);
  78                 temp2 = readb(fp + SIG1);
  79                 temp3 = readb(fp + SIG2);
  80                 temp4 = readb(fp + SIG3);
  81                 if (temp1 == '$' && temp2 == 'H' && temp3 == 'R' && temp4 == 'T') {
  82                         status = 1;
  83                         break;
  84                 }
  85         }
  86
  87         if (!status)
  88                 fp = NULL;
  89
  90         dbg("Discovered Hotplug Resource Table at %p\n", fp);
  91         return fp;
  92 }
  93
  94 /*
  95  * shpchprm_find_available_resources
  96  *
  97  *  Finds available memory, IO, and IRQ resources for programming
  98  *  devices which may be added to the system
  99  *  this function is for hot plug ADD!
 100  *
 101  * returns 0 if success
 102  */
 103 int shpchprm_find_available_resources(struct controller *ctrl)
 104 {
 105         u8 populated_slot;
 106         u8 bridged_slot;
 107         void __iomem *one_slot;
 108         struct pci_func *func = NULL;
 109         int i = 10, index = 0;
 110         u32 temp_dword, rc;
 111         ulong temp_ulong;
 112         struct pci_resource *mem_node;
 113         struct pci_resource *p_mem_node;
 114         struct pci_resource *io_node;
 115         struct pci_resource *bus_node;
 116         void __iomem *rom_resource_table;
 117         struct pci_bus lpci_bus, *pci_bus;
 118         u8 cfgspc_irq, temp;
 119
 120         memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
 121         pci_bus = &lpci_bus;
 122         rom_resource_table = detect_HRT_floating_pointer(shpchp_rom_start, shpchp_rom_start + 0xffff);
 123         dbg("rom_resource_table = %p\n", rom_resource_table);
 124         if (rom_resource_table == NULL)
 125                 return -ENODEV;
 126
 127         /* Sum all resources and setup resource maps */
 128         unused_IRQ = readl(rom_resource_table + UNUSED_IRQ);
 129         dbg("unused_IRQ = %x\n", unused_IRQ);
 130
 131         temp = 0;
 132         while (unused_IRQ) {
 133                 if (unused_IRQ & 1) {
 134                         shpchp_disk_irq = temp;
 135                         break;
 136                 }
 137                 unused_IRQ = unused_IRQ >> 1;
 138                 temp++;
 139         }
 140
 141         dbg("shpchp_disk_irq= %d\n", shpchp_disk_irq);
 142         unused_IRQ = unused_IRQ >> 1;
 143         temp++;
 144
 145         while (unused_IRQ) {
 146                 if (unused_IRQ & 1) {
 147                         shpchp_nic_irq = temp;
 148                         break;
 149                 }
 150                 unused_IRQ = unused_IRQ >> 1;
 151                 temp++;
 152         }
 153
 154         dbg("shpchp_nic_irq= %d\n", shpchp_nic_irq);
 155         unused_IRQ = readl(rom_resource_table + PCIIRQ);
 156
 157         temp = 0;
 158
 159         pci_read_config_byte(ctrl->pci_dev, PCI_INTERRUPT_LINE, &cfgspc_irq);
 160
 161         if (!shpchp_nic_irq) {
 162                 shpchp_nic_irq = cfgspc_irq;
 163         }
 164
 165         if (!shpchp_disk_irq) {
 166                 shpchp_disk_irq = cfgspc_irq;
 167         }
 168
 169         dbg("shpchp_disk_irq, shpchp_nic_irq= %d, %d\n", shpchp_disk_irq, shpchp_nic_irq);
 170
 171         one_slot = rom_resource_table + sizeof(struct hrt);
 172
 173         i = readb(rom_resource_table + NUMBER_OF_ENTRIES);
 174         dbg("number_of_entries = %d\n", i);
 175
 176         if (!readb(one_slot + SECONDARY_BUS))
 177                 return (1);
 178
 179         dbg("dev|IO base|length|MEMbase|length|PM base|length|PB SB MB\n");
 180
 181         while (i && readb(one_slot + SECONDARY_BUS)) {
 182                 u8 dev_func = readb(one_slot + DEV_FUNC);
 183                 u8 primary_bus = readb(one_slot + PRIMARY_BUS);
 184                 u8 secondary_bus = readb(one_slot + SECONDARY_BUS);
 185                 u8 max_bus = readb(one_slot + MAX_BUS);
 186                 u16 io_base = readw(one_slot + IO_BASE);
 187                 u16 io_length = readw(one_slot + IO_LENGTH);
 188                 u16 mem_base = readw(one_slot + MEM_BASE);
 189                 u16 mem_length = readw(one_slot + MEM_LENGTH);
 190                 u16 pre_mem_base = readw(one_slot + PRE_MEM_BASE);
 191                 u16 pre_mem_length = readw(one_slot + PRE_MEM_LENGTH);
 192
 193                 dbg("%2.2x |  %4.4x | %4.4x |  %4.4x | %4.4x |  %4.4x | %4.4x |%2.2x %2.2x %2.2x\n",
 194                                 dev_func, io_base, io_length, mem_base, mem_length, pre_mem_base, pre_mem_length,
 195                                 primary_bus, secondary_bus, max_bus);
 196
 197                 /* If this entry isn't for our controller's bus, ignore it */
 198                 if (primary_bus != ctrl->slot_bus) {
 199                         i--;
 200                         one_slot += sizeof(struct slot_rt);
 201                         continue;
 202                 }
 203                 /* find out if this entry is for an occupied slot */
 204                 temp_dword = 0xFFFFFFFF;
 205                 pci_bus->number = primary_bus;
 206                 pci_bus_read_config_dword(pci_bus, dev_func, PCI_VENDOR_ID, &temp_dword);
 207
 208                 dbg("temp_D_word = %x\n", temp_dword);
 209
 210                 if (temp_dword != 0xFFFFFFFF) {
 211                         index = 0;
 212                         func = shpchp_slot_find(primary_bus, dev_func >> 3, 0);
 213
 214                         while (func && (func->function != (dev_func & 0x07))) {
 215                                 dbg("func = %p b:d:f(%x:%x:%x)\n", func, primary_bus, dev_func >> 3, index);
 216                                 func = shpchp_slot_find(primary_bus, dev_func >> 3, index++);
 217                         }
 218
 219                         /* If we can't find a match, skip this table entry */
 220                         if (!func) {
 221                                 i--;
 222                                 one_slot += sizeof(struct slot_rt);
 223                                 continue;
 224                         }
 225                         /* this may not work and shouldn't be used */
 226                         if (secondary_bus != primary_bus)
 227                                 bridged_slot = 1;
 228                         else
 229                                 bridged_slot = 0;
 230
 231                         populated_slot = 1;
 232                 } else {
 233                         populated_slot = 0;
 234                         bridged_slot = 0;
 235                 }
 236                 dbg("slot populated =%s \n", populated_slot?"yes":"no");
 237
 238                 /* If we've got a valid IO base, use it */
 239
 240                 temp_ulong = io_base + io_length;
 241
 242                 if ((io_base) && (temp_ulong <= 0x10000)) {
 243                         io_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 244                         if (!io_node)
 245                                 return -ENOMEM;
 246
 247                         io_node->base = (ulong)io_base;
 248                         io_node->length = (ulong)io_length;
 249                         dbg("found io_node(base, length) = %x, %x\n", io_node->base, io_node->length);
 250
 251                         if (!populated_slot) {
 252                                 io_node->next = ctrl->io_head;
 253                                 ctrl->io_head = io_node;
 254                         } else {
 255                                 io_node->next = func->io_head;
 256                                 func->io_head = io_node;
 257                         }
 258                 }
 259
 260                 /* If we've got a valid memory base, use it */
 261                 temp_ulong = mem_base + mem_length;
 262                 if ((mem_base) && (temp_ulong <= 0x10000)) {
 263                         mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 264                         if (!mem_node)
 265                                 return -ENOMEM;
 266
 267                         mem_node->base = (ulong)mem_base << 16;
 268                         mem_node->length = (ulong)(mem_length << 16);
 269                         dbg("found mem_node(base, length) = %x, %x\n", mem_node->base, mem_node->length);
 270
 271                         if (!populated_slot) {
 272                                 mem_node->next = ctrl->mem_head;
 273                                 ctrl->mem_head = mem_node;
 274                         } else {
 275                                 mem_node->next = func->mem_head;
 276                                 func->mem_head = mem_node;
 277                         }
 278                 }
 279
 280                 /*
 281                  * If we've got a valid prefetchable memory base, and
 282                  * the base + length isn't greater than 0xFFFF
 283                  */
 284                 temp_ulong = pre_mem_base + pre_mem_length;
 285                 if ((pre_mem_base) && (temp_ulong <= 0x10000)) {
 286                         p_mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 287                         if (!p_mem_node)
 288                                 return -ENOMEM;
 289
 290                         p_mem_node->base = (ulong)pre_mem_base << 16;
 291                         p_mem_node->length = (ulong)pre_mem_length << 16;
 292                         dbg("found p_mem_node(base, length) = %x, %x\n", p_mem_node->base, p_mem_node->length);
 293
 294                         if (!populated_slot) {
 295                                 p_mem_node->next = ctrl->p_mem_head;
 296                                 ctrl->p_mem_head = p_mem_node;
 297                         } else {
 298                                 p_mem_node->next = func->p_mem_head;
 299                                 func->p_mem_head = p_mem_node;
 300                         }
 301                 }
 302
 303                 /*
 304                  * If we've got a valid bus number, use it
 305                  * The second condition is to ignore bus numbers on
 306                  * populated slots that don't have PCI-PCI bridges
 307                  */
 308                 if (secondary_bus && (secondary_bus != primary_bus)) {
 309                         bus_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 310                         if (!bus_node)
 311                                 return -ENOMEM;
 312
 313                         bus_node->base = (ulong)secondary_bus;
 314                         bus_node->length = (ulong)(max_bus - secondary_bus + 1);
 315                         dbg("found bus_node(base, length) = %x, %x\n", bus_node->base, bus_node->length);
 316
 317                         if (!populated_slot) {
 318                                 bus_node->next = ctrl->bus_head;
 319                                 ctrl->bus_head = bus_node;
 320                         } else {
 321                                 bus_node->next = func->bus_head;
 322                                 func->bus_head = bus_node;
 323                         }
 324                 }
 325
 326                 i--;
 327                 one_slot += sizeof(struct slot_rt);
 328         }
 329
 330         /* If all of the following fail, we don't have any resources for hot plug add */
 331         rc = 1;
 332         rc &= shpchp_resource_sort_and_combine(&(ctrl->mem_head));
 333         rc &= shpchp_resource_sort_and_combine(&(ctrl->p_mem_head));
 334         rc &= shpchp_resource_sort_and_combine(&(ctrl->io_head));
 335         rc &= shpchp_resource_sort_and_combine(&(ctrl->bus_head));
 336
 337         return (rc);
 338 }
 339
 340 int shpchprm_set_hpp(
 341         struct controller *ctrl,
 342         struct pci_func *func,
 343         u8      card_type)
 344 {
 345         u32 rc;
 346         u8 temp_byte;
 347         struct pci_bus lpci_bus, *pci_bus;
 348         unsigned int    devfn;
 349         memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
 350         pci_bus = &lpci_bus;
 351         pci_bus->number = func->bus;
 352         devfn = PCI_DEVFN(func->device, func->function);
 353
 354         temp_byte = 0x40;       /* hard coded value for LT */
 355         if (card_type == PCI_HEADER_TYPE_BRIDGE) {
 356                 /* set subordinate Latency Timer */
 357                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SEC_LATENCY_TIMER, temp_byte);
 358                 if (rc) {
 359                         dbg("%s: set secondary LT error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus,
 360                                 func->device, func->function);
 361                         return rc;
 362                 }
 363         }
 364
 365         /* set base Latency Timer */
 366         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_LATENCY_TIMER, temp_byte);
 367         if (rc) {
 368                 dbg("%s: set LT error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, func->device, func->function);
 369                 return rc;
 370         }
 371
 372         /* set Cache Line size */
 373         temp_byte = 0x08;       /* hard coded value for CLS */
 374         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_CACHE_LINE_SIZE, temp_byte);
 375         if (rc) {
 376                 dbg("%s: set CLS error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, func->device, func->function);
 377         }
 378
 379         /* set enable_perr */
 380         /* set enable_serr */
 381
 382         return rc;
 383 }
 384
 385 void shpchprm_enable_card(
 386         struct controller *ctrl,
 387         struct pci_func *func,
 388         u8 card_type)
 389 {
 390         u16 command, bcommand;
 391         struct pci_bus lpci_bus, *pci_bus;
 392         unsigned int devfn;
 393         int rc;
 394
 395         memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
 396         pci_bus = &lpci_bus;
 397         pci_bus->number = func->bus;
 398         devfn = PCI_DEVFN(func->device, func->function);
 399
 400         rc = pci_bus_read_config_word(pci_bus, devfn, PCI_COMMAND, &command);
 401         command |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR
 402                 | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
 403                 | PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
 404         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_COMMAND, command);
 405
 406         if (card_type == PCI_HEADER_TYPE_BRIDGE) {
 407                 rc = pci_bus_read_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, &bcommand);
 408                 bcommand |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR
 409                         | PCI_BRIDGE_CTL_NO_ISA;
 410                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, bcommand);
 411         }
 412 }
 413
 414 static int legacy_shpchprm_init_pci(void)
 415 {
 416         shpchp_rom_start = ioremap(ROM_PHY_ADDR, ROM_PHY_LEN);
 417         if (!shpchp_rom_start) {
 418                 err("Could not ioremap memory region for ROM\n");
 419                 return -EIO;
 420         }
 421
 422         return 0;
 423 }
 424
 425 int shpchprm_init(enum php_ctlr_type ctrl_type)
 426 {
 427         int retval;
 428
 429         switch (ctrl_type) {
 430         case PCI:
 431                 retval = legacy_shpchprm_init_pci();
 432                 break;
 433         default:
 434                 retval = -ENODEV;
 435                 break;
 436         }
 437
 438         return retval;
 439 }