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