drivers/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>, <dely.l.sy@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 *shpchp_rom_start;
  45 static u16 unused_IRQ;
  46
  47 void shpchprm_cleanup()
  48 {
  49         if (shpchp_rom_start)
  50                 iounmap(shpchp_rom_start);
  51 }
  52
  53
  54 int shpchprm_print_pirt()
  55 {
  56         return 0;
  57 }
  58
  59 void * shpchprm_get_slot(struct slot *slot)
  60 {
  61         return NULL;
  62 }
  63
  64 int shpchprm_get_physical_slot_number(struct controller *ctrl, u32 *sun, u8 busnum, u8 devnum)
  65 {
  66         int     offset = devnum - ctrl->slot_device_offset;
  67
  68         *sun = (u8) (ctrl->first_slot + ctrl->slot_num_inc * offset);
  69         return 0;
  70 }
  71
  72 /* find the Hot Plug Resource Table in the specified region of memory */
  73 static void *detect_HRT_floating_pointer(void *begin, void *end)
  74 {
  75         void *fp;
  76         void *endp;
  77         u8 temp1, temp2, temp3, temp4;
  78         int status = 0;
  79
  80         endp = (end - sizeof(struct hrt) + 1);
  81
  82         for (fp = begin; fp <= endp; fp += 16) {
  83                 temp1 = readb(fp + SIG0);
  84                 temp2 = readb(fp + SIG1);
  85                 temp3 = readb(fp + SIG2);
  86                 temp4 = readb(fp + SIG3);
  87                 if (temp1 == '$' && temp2 == 'H' && temp3 == 'R' && temp4 == 'T') {
  88                         status = 1;
  89                         break;
  90                 }
  91         }
  92
  93         if (!status)
  94                 fp = NULL;
  95
  96         dbg("Discovered Hotplug Resource Table at %p\n", fp);
  97         return fp;
  98 }
  99
 100 /*
 101  * shpchprm_find_available_resources
 102  *
 103  *  Finds available memory, IO, and IRQ resources for programming
 104  *  devices which may be added to the system
 105  *  this function is for hot plug ADD!
 106  *
 107  * returns 0 if success
 108  */
 109 int shpchprm_find_available_resources(struct controller *ctrl)
 110 {
 111         u8 populated_slot;
 112         u8 bridged_slot;
 113         void *one_slot;
 114         struct pci_func *func = NULL;
 115         int i = 10, index = 0;
 116         u32 temp_dword, rc;
 117         ulong temp_ulong;
 118         struct pci_resource *mem_node;
 119         struct pci_resource *p_mem_node;
 120         struct pci_resource *io_node;
 121         struct pci_resource *bus_node;
 122         void *rom_resource_table;
 123         struct pci_bus lpci_bus, *pci_bus;
 124         u8 cfgspc_irq, temp;
 125
 126         memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
 127         pci_bus = &lpci_bus;
 128         rom_resource_table = detect_HRT_floating_pointer(shpchp_rom_start, shpchp_rom_start + 0xffff);
 129         dbg("rom_resource_table = %p\n", rom_resource_table);
 130         if (rom_resource_table == NULL)
 131                 return -ENODEV;
 132
 133         /* Sum all resources and setup resource maps */
 134         unused_IRQ = readl(rom_resource_table + UNUSED_IRQ);
 135         dbg("unused_IRQ = %x\n", unused_IRQ);
 136
 137         temp = 0;
 138         while (unused_IRQ) {
 139                 if (unused_IRQ & 1) {
 140                         shpchp_disk_irq = temp;
 141                         break;
 142                 }
 143                 unused_IRQ = unused_IRQ >> 1;
 144                 temp++;
 145         }
 146
 147         dbg("shpchp_disk_irq= %d\n", shpchp_disk_irq);
 148         unused_IRQ = unused_IRQ >> 1;
 149         temp++;
 150
 151         while (unused_IRQ) {
 152                 if (unused_IRQ & 1) {
 153                         shpchp_nic_irq = temp;
 154                         break;
 155                 }
 156                 unused_IRQ = unused_IRQ >> 1;
 157                 temp++;
 158         }
 159
 160         dbg("shpchp_nic_irq= %d\n", shpchp_nic_irq);
 161         unused_IRQ = readl(rom_resource_table + PCIIRQ);
 162
 163         temp = 0;
 164
 165         pci_read_config_byte(ctrl->pci_dev, PCI_INTERRUPT_LINE, &cfgspc_irq);
 166
 167         if (!shpchp_nic_irq) {
 168                 shpchp_nic_irq = cfgspc_irq;
 169         }
 170
 171         if (!shpchp_disk_irq) {
 172                 shpchp_disk_irq = cfgspc_irq;
 173         }
 174
 175         dbg("shpchp_disk_irq, shpchp_nic_irq= %d, %d\n", shpchp_disk_irq, shpchp_nic_irq);
 176
 177         one_slot = rom_resource_table + sizeof(struct hrt);
 178
 179         i = readb(rom_resource_table + NUMBER_OF_ENTRIES);
 180         dbg("number_of_entries = %d\n", i);
 181
 182         if (!readb(one_slot + SECONDARY_BUS))
 183                 return (1);
 184
 185         dbg("dev|IO base|length|MEMbase|length|PM base|length|PB SB MB\n");
 186
 187         while (i && readb(one_slot + SECONDARY_BUS)) {
 188                 u8 dev_func = readb(one_slot + DEV_FUNC);
 189                 u8 primary_bus = readb(one_slot + PRIMARY_BUS);
 190                 u8 secondary_bus = readb(one_slot + SECONDARY_BUS);
 191                 u8 max_bus = readb(one_slot + MAX_BUS);
 192                 u16 io_base = readw(one_slot + IO_BASE);
 193                 u16 io_length = readw(one_slot + IO_LENGTH);
 194                 u16 mem_base = readw(one_slot + MEM_BASE);
 195                 u16 mem_length = readw(one_slot + MEM_LENGTH);
 196                 u16 pre_mem_base = readw(one_slot + PRE_MEM_BASE);
 197                 u16 pre_mem_length = readw(one_slot + PRE_MEM_LENGTH);
 198
 199                 dbg("%2.2x |  %4.4x | %4.4x |  %4.4x | %4.4x |  %4.4x | %4.4x |%2.2x %2.2x %2.2x\n",
 200                                 dev_func, io_base, io_length, mem_base, mem_length, pre_mem_base, pre_mem_length,
 201                                 primary_bus, secondary_bus, max_bus);
 202
 203                 /* If this entry isn't for our controller's bus, ignore it */
 204                 if (primary_bus != ctrl->slot_bus) {
 205                         i--;
 206                         one_slot += sizeof(struct slot_rt);
 207                         continue;
 208                 }
 209                 /* Find out if this entry is for an occupied slot */
 210                 temp_dword = 0xFFFFFFFF;
 211                 pci_bus->number = primary_bus;
 212                 pci_bus_read_config_dword(pci_bus, dev_func, PCI_VENDOR_ID, &temp_dword);
 213
 214                 dbg("temp_D_word = %x\n", temp_dword);
 215
 216                 if (temp_dword != 0xFFFFFFFF) {
 217                         index = 0;
 218                         func = shpchp_slot_find(primary_bus, dev_func >> 3, 0);
 219
 220                         while (func && (func->function != (dev_func & 0x07))) {
 221                                 dbg("func = %p b:d:f(%x:%x:%x)\n", func, primary_bus, dev_func >> 3, index);
 222                                 func = shpchp_slot_find(primary_bus, dev_func >> 3, index++);
 223                         }
 224
 225                         /* If we can't find a match, skip this table entry */
 226                         if (!func) {
 227                                 i--;
 228                                 one_slot += sizeof(struct slot_rt);
 229                                 continue;
 230                         }
 231                         /* This may not work and shouldn't be used */
 232                         if (secondary_bus != primary_bus)
 233                                 bridged_slot = 1;
 234                         else
 235                                 bridged_slot = 0;
 236
 237                         populated_slot = 1;
 238                 } else {
 239                         populated_slot = 0;
 240                         bridged_slot = 0;
 241                 }
 242                 dbg("slot populated =%s \n", populated_slot?"yes":"no");
 243
 244                 /* If we've got a valid IO base, use it */
 245
 246                 temp_ulong = io_base + io_length;
 247
 248                 if ((io_base) && (temp_ulong <= 0x10000)) {
 249                         io_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 250                         if (!io_node)
 251                                 return -ENOMEM;
 252
 253                         io_node->base = (ulong)io_base;
 254                         io_node->length = (ulong)io_length;
 255                         dbg("found io_node(base, length) = %x, %x\n", io_node->base, io_node->length);
 256
 257                         if (!populated_slot) {
 258                                 io_node->next = ctrl->io_head;
 259                                 ctrl->io_head = io_node;
 260                         } else {
 261                                 io_node->next = func->io_head;
 262                                 func->io_head = io_node;
 263                         }
 264                 }
 265
 266                 /* If we've got a valid memory base, use it */
 267                 temp_ulong = mem_base + mem_length;
 268                 if ((mem_base) && (temp_ulong <= 0x10000)) {
 269                         mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 270                         if (!mem_node)
 271                                 return -ENOMEM;
 272
 273                         mem_node->base = (ulong)mem_base << 16;
 274                         mem_node->length = (ulong)(mem_length << 16);
 275                         dbg("found mem_node(base, length) = %x, %x\n", mem_node->base, mem_node->length);
 276
 277                         if (!populated_slot) {
 278                                 mem_node->next = ctrl->mem_head;
 279                                 ctrl->mem_head = mem_node;
 280                         } else {
 281                                 mem_node->next = func->mem_head;
 282                                 func->mem_head = mem_node;
 283                         }
 284                 }
 285
 286                 /*
 287                  * If we've got a valid prefetchable memory base, and
 288                  * the base + length isn't greater than 0xFFFF
 289                  */
 290                 temp_ulong = pre_mem_base + pre_mem_length;
 291                 if ((pre_mem_base) && (temp_ulong <= 0x10000)) {
 292                         p_mem_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 293                         if (!p_mem_node)
 294                                 return -ENOMEM;
 295
 296                         p_mem_node->base = (ulong)pre_mem_base << 16;
 297                         p_mem_node->length = (ulong)pre_mem_length << 16;
 298                         dbg("found p_mem_node(base, length) = %x, %x\n", p_mem_node->base, p_mem_node->length);
 299
 300                         if (!populated_slot) {
 301                                 p_mem_node->next = ctrl->p_mem_head;
 302                                 ctrl->p_mem_head = p_mem_node;
 303                         } else {
 304                                 p_mem_node->next = func->p_mem_head;
 305                                 func->p_mem_head = p_mem_node;
 306                         }
 307                 }
 308
 309                 /*
 310                  * If we've got a valid bus number, use it
 311                  * The second condition is to ignore bus numbers on
 312                  * populated slots that don't have PCI-PCI bridges
 313                  */
 314                 if (secondary_bus && (secondary_bus != primary_bus)) {
 315                         bus_node = (struct pci_resource *) kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
 316                         if (!bus_node)
 317                                 return -ENOMEM;
 318
 319                         bus_node->base = (ulong)secondary_bus;
 320                         bus_node->length = (ulong)(max_bus - secondary_bus + 1);
 321                         dbg("found bus_node(base, length) = %x, %x\n", bus_node->base, bus_node->length);
 322
 323                         if (!populated_slot) {
 324                                 bus_node->next = ctrl->bus_head;
 325                                 ctrl->bus_head = bus_node;
 326                         } else {
 327                                 bus_node->next = func->bus_head;
 328                                 func->bus_head = bus_node;
 329                         }
 330                 }
 331
 332                 i--;
 333                 one_slot += sizeof(struct slot_rt);
 334         }
 335
 336         /* If all of the following fail, we don't have any resources for hot plug add */
 337         rc = 1;
 338         rc &= shpchp_resource_sort_and_combine(&(ctrl->mem_head));
 339         rc &= shpchp_resource_sort_and_combine(&(ctrl->p_mem_head));
 340         rc &= shpchp_resource_sort_and_combine(&(ctrl->io_head));
 341         rc &= shpchp_resource_sort_and_combine(&(ctrl->bus_head));
 342
 343         return (rc);
 344 }
 345
 346 int shpchprm_set_hpp(
 347         struct controller *ctrl,
 348         struct pci_func *func,
 349         u8      card_type)
 350 {
 351         u32 rc;
 352         u8 temp_byte;
 353         struct pci_bus lpci_bus, *pci_bus;
 354         unsigned int    devfn;
 355         memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
 356         pci_bus = &lpci_bus;
 357         pci_bus->number = func->bus;
 358         devfn = PCI_DEVFN(func->device, func->function);
 359
 360         temp_byte = 0x40;       /* Hard coded value for LT */
 361         if (card_type == PCI_HEADER_TYPE_BRIDGE) {
 362                 /* Set subordinate Latency Timer */
 363                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SEC_LATENCY_TIMER, temp_byte);
 364                 if (rc) {
 365                         dbg("%s: set secondary LT error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, func->device, func->function);
 366                         return rc;
 367                 }
 368         }
 369
 370         /* Set base Latency Timer */
 371         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_LATENCY_TIMER, temp_byte);
 372         if (rc) {
 373                 dbg("%s: set LT error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, func->device, func->function);
 374                 return rc;
 375         }
 376
 377         /* Set Cache Line size */
 378         temp_byte = 0x08;       /* hard coded value for CLS */
 379         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_CACHE_LINE_SIZE, temp_byte);
 380         if (rc) {
 381                 dbg("%s: set CLS error. b:d:f(%02x:%02x:%02x)\n", __FUNCTION__, func->bus, func->device, func->function);
 382         }
 383
 384         /* Set enable_perr */
 385         /* Set enable_serr */
 386
 387         return rc;
 388 }
 389
 390 void shpchprm_enable_card(
 391         struct controller *ctrl,
 392         struct pci_func *func,
 393         u8 card_type)
 394 {
 395         u16 command, bcommand;
 396         struct pci_bus lpci_bus, *pci_bus;
 397         unsigned int devfn;
 398         int rc;
 399
 400         memcpy(&lpci_bus, ctrl->pci_bus, sizeof(lpci_bus));
 401         pci_bus = &lpci_bus;
 402         pci_bus->number = func->bus;
 403         devfn = PCI_DEVFN(func->device, func->function);
 404
 405         rc = pci_bus_read_config_word(pci_bus, devfn, PCI_COMMAND, &command);
 406         command |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR
 407                 | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
 408                 | PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
 409         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_COMMAND, command);
 410
 411         if (card_type == PCI_HEADER_TYPE_BRIDGE) {
 412                 rc = pci_bus_read_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, &bcommand);
 413                 bcommand |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR
 414                         | PCI_BRIDGE_CTL_NO_ISA;
 415                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, bcommand);
 416         }
 417 }
 418
 419 static int legacy_shpchprm_init_pci(void)
 420 {
 421         shpchp_rom_start = (u8 *) ioremap(ROM_PHY_ADDR, ROM_PHY_LEN);
 422         if (!shpchp_rom_start) {
 423                 err("Could not ioremap memory region for ROM\n");
 424                 return -EIO;
 425         }
 426
 427         return 0;
 428 }
 429
 430 int shpchprm_init(enum php_ctlr_type ctrl_type)
 431 {
 432         int retval;
 433
 434         switch (ctrl_type) {
 435         case PCI:
 436                 retval = legacy_shpchprm_init_pci();
 437                 break;
 438         default:
 439                 retval = -ENODEV;
 440                 break;
 441         }
 442
 443         return retval;
 444 }