drivers/pci/pci_auto_old.c

   1 /*
   2  * PCI autoconfiguration library (legacy version, do not change)
   3  *
   4  * Author: Matt Porter <mporter@mvista.com>
   5  *
   6  * Copyright 2000 MontaVista Software Inc.
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <errno.h>
  13 #include <pci.h>
  14
  15 /*
  16  * Do not change this file. Instead, convert your board to use CONFIG_DM_PCI
  17  * and change pci_auto.c.
  18  */
  19
  20 /* the user can define CONFIG_SYS_PCI_CACHE_LINE_SIZE to avoid problems */
  21 #ifndef CONFIG_SYS_PCI_CACHE_LINE_SIZE
  22 #define CONFIG_SYS_PCI_CACHE_LINE_SIZE  8
  23 #endif
  24
  25 /*
  26  *
  27  */
  28
  29 void pciauto_setup_device(struct pci_controller *hose,
  30                           pci_dev_t dev, int bars_num,
  31                           struct pci_region *mem,
  32                           struct pci_region *prefetch,
  33                           struct pci_region *io)
  34 {
  35         u32 bar_response;
  36         pci_size_t bar_size;
  37         u16 cmdstat = 0;
  38         int bar, bar_nr = 0;
  39 #ifndef CONFIG_PCI_ENUM_ONLY
  40         u8 header_type;
  41         int rom_addr;
  42         pci_addr_t bar_value;
  43         struct pci_region *bar_res;
  44         int found_mem64 = 0;
  45 #endif
  46         u16 class;
  47
  48         pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
  49         cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) | PCI_COMMAND_MASTER;
  50
  51         for (bar = PCI_BASE_ADDRESS_0;
  52                 bar < PCI_BASE_ADDRESS_0 + (bars_num * 4); bar += 4) {
  53                 /* Tickle the BAR and get the response */
  54 #ifndef CONFIG_PCI_ENUM_ONLY
  55                 pci_hose_write_config_dword(hose, dev, bar, 0xffffffff);
  56 #endif
  57                 pci_hose_read_config_dword(hose, dev, bar, &bar_response);
  58
  59                 /* If BAR is not implemented go to the next BAR */
  60                 if (!bar_response)
  61                         continue;
  62
  63 #ifndef CONFIG_PCI_ENUM_ONLY
  64                 found_mem64 = 0;
  65 #endif
  66
  67                 /* Check the BAR type and set our address mask */
  68                 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
  69                         bar_size = ((~(bar_response & PCI_BASE_ADDRESS_IO_MASK))
  70                                    & 0xffff) + 1;
  71 #ifndef CONFIG_PCI_ENUM_ONLY
  72                         bar_res = io;
  73 #endif
  74
  75                         debug("PCI Autoconfig: BAR %d, I/O, size=0x%llx, ",
  76                               bar_nr, (unsigned long long)bar_size);
  77                 } else {
  78                         if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
  79                              PCI_BASE_ADDRESS_MEM_TYPE_64) {
  80                                 u32 bar_response_upper;
  81                                 u64 bar64;
  82
  83 #ifndef CONFIG_PCI_ENUM_ONLY
  84                                 pci_hose_write_config_dword(hose, dev, bar + 4,
  85                                         0xffffffff);
  86 #endif
  87                                 pci_hose_read_config_dword(hose, dev, bar + 4,
  88                                         &bar_response_upper);
  89
  90                                 bar64 = ((u64)bar_response_upper << 32) | bar_response;
  91
  92                                 bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK) + 1;
  93 #ifndef CONFIG_PCI_ENUM_ONLY
  94                                 found_mem64 = 1;
  95 #endif
  96                         } else {
  97                                 bar_size = (u32)(~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1);
  98                         }
  99 #ifndef CONFIG_PCI_ENUM_ONLY
 100                         if (prefetch && (bar_response & PCI_BASE_ADDRESS_MEM_PREFETCH))
 101                                 bar_res = prefetch;
 102                         else
 103                                 bar_res = mem;
 104
 105                         debug("PCI Autoconfig: BAR %d, %s, size=0x%llx, ",
 106                               bar_nr, bar_res == prefetch ? "Prf" : "Mem",
 107                               (unsigned long long)bar_size);
 108 #endif
 109                 }
 110
 111 #ifndef CONFIG_PCI_ENUM_ONLY
 112                 if (pciauto_region_allocate(bar_res, bar_size, &bar_value) == 0) {
 113                         /* Write it out and update our limit */
 114                         pci_hose_write_config_dword(hose, dev, bar, (u32)bar_value);
 115
 116                         if (found_mem64) {
 117                                 bar += 4;
 118 #ifdef CONFIG_SYS_PCI_64BIT
 119                                 pci_hose_write_config_dword(hose, dev, bar, (u32)(bar_value>>32));
 120 #else
 121                                 /*
 122                                  * If we are a 64-bit decoder then increment to the
 123                                  * upper 32 bits of the bar and force it to locate
 124                                  * in the lower 4GB of memory.
 125                                  */
 126                                 pci_hose_write_config_dword(hose, dev, bar, 0x00000000);
 127 #endif
 128                         }
 129
 130                 }
 131 #endif
 132                 cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
 133                         PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
 134
 135                 debug("\n");
 136
 137                 bar_nr++;
 138         }
 139
 140 #ifndef CONFIG_PCI_ENUM_ONLY
 141         /* Configure the expansion ROM address */
 142         pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type);
 143         header_type &= 0x7f;
 144         if (header_type != PCI_HEADER_TYPE_CARDBUS) {
 145                 rom_addr = (header_type == PCI_HEADER_TYPE_NORMAL) ?
 146                            PCI_ROM_ADDRESS : PCI_ROM_ADDRESS1;
 147                 pci_hose_write_config_dword(hose, dev, rom_addr, 0xfffffffe);
 148                 pci_hose_read_config_dword(hose, dev, rom_addr, &bar_response);
 149                 if (bar_response) {
 150                         bar_size = -(bar_response & ~1);
 151                         debug("PCI Autoconfig: ROM, size=%#x, ",
 152                               (unsigned int)bar_size);
 153                         if (pciauto_region_allocate(mem, bar_size,
 154                                                     &bar_value) == 0) {
 155                                 pci_hose_write_config_dword(hose, dev, rom_addr,
 156                                                             bar_value);
 157                         }
 158                         cmdstat |= PCI_COMMAND_MEMORY;
 159                         debug("\n");
 160                 }
 161         }
 162 #endif
 163
 164         /* PCI_COMMAND_IO must be set for VGA device */
 165         pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 166         if (class == PCI_CLASS_DISPLAY_VGA)
 167                 cmdstat |= PCI_COMMAND_IO;
 168
 169         pci_hose_write_config_word(hose, dev, PCI_COMMAND, cmdstat);
 170         pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE,
 171                 CONFIG_SYS_PCI_CACHE_LINE_SIZE);
 172         pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
 173 }
 174
 175 void pciauto_prescan_setup_bridge(struct pci_controller *hose,
 176                                          pci_dev_t dev, int sub_bus)
 177 {
 178         struct pci_region *pci_mem;
 179         struct pci_region *pci_prefetch;
 180         struct pci_region *pci_io;
 181         u16 cmdstat, prefechable_64;
 182
 183         pci_mem = hose->pci_mem;
 184         pci_prefetch = hose->pci_prefetch;
 185         pci_io = hose->pci_io;
 186
 187         pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
 188         pci_hose_read_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
 189                                 &prefechable_64);
 190         prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
 191
 192         /* Configure bus number registers */
 193         pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS,
 194                                    PCI_BUS(dev) - hose->first_busno);
 195         pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS,
 196                                    sub_bus - hose->first_busno);
 197         pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff);
 198
 199         if (pci_mem) {
 200                 /* Round memory allocator to 1MB boundary */
 201                 pciauto_region_align(pci_mem, 0x100000);
 202
 203                 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
 204                 pci_hose_write_config_word(hose, dev, PCI_MEMORY_BASE,
 205                                         (pci_mem->bus_lower & 0xfff00000) >> 16);
 206
 207                 cmdstat |= PCI_COMMAND_MEMORY;
 208         }
 209
 210         if (pci_prefetch) {
 211                 /* Round memory allocator to 1MB boundary */
 212                 pciauto_region_align(pci_prefetch, 0x100000);
 213
 214                 /* Set up memory and I/O filter limits, assume 32-bit I/O space */
 215                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
 216                                         (pci_prefetch->bus_lower & 0xfff00000) >> 16);
 217                 if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
 218 #ifdef CONFIG_SYS_PCI_64BIT
 219                         pci_hose_write_config_dword(hose, dev,
 220                                         PCI_PREF_BASE_UPPER32,
 221                                         pci_prefetch->bus_lower >> 32);
 222 #else
 223                         pci_hose_write_config_dword(hose, dev,
 224                                         PCI_PREF_BASE_UPPER32,
 225                                         0x0);
 226 #endif
 227
 228                 cmdstat |= PCI_COMMAND_MEMORY;
 229         } else {
 230                 /* We don't support prefetchable memory for now, so disable */
 231                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_BASE, 0x1000);
 232                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT, 0x0);
 233                 if (prefechable_64 == PCI_PREF_RANGE_TYPE_64) {
 234                         pci_hose_write_config_word(hose, dev, PCI_PREF_BASE_UPPER32, 0x0);
 235                         pci_hose_write_config_word(hose, dev, PCI_PREF_LIMIT_UPPER32, 0x0);
 236                 }
 237         }
 238
 239         if (pci_io) {
 240                 /* Round I/O allocator to 4KB boundary */
 241                 pciauto_region_align(pci_io, 0x1000);
 242
 243                 pci_hose_write_config_byte(hose, dev, PCI_IO_BASE,
 244                                         (pci_io->bus_lower & 0x0000f000) >> 8);
 245                 pci_hose_write_config_word(hose, dev, PCI_IO_BASE_UPPER16,
 246                                         (pci_io->bus_lower & 0xffff0000) >> 16);
 247
 248                 cmdstat |= PCI_COMMAND_IO;
 249         }
 250
 251         /* Enable memory and I/O accesses, enable bus master */
 252         pci_hose_write_config_word(hose, dev, PCI_COMMAND,
 253                                         cmdstat | PCI_COMMAND_MASTER);
 254 }
 255
 256 void pciauto_postscan_setup_bridge(struct pci_controller *hose,
 257                                           pci_dev_t dev, int sub_bus)
 258 {
 259         struct pci_region *pci_mem;
 260         struct pci_region *pci_prefetch;
 261         struct pci_region *pci_io;
 262
 263         pci_mem = hose->pci_mem;
 264         pci_prefetch = hose->pci_prefetch;
 265         pci_io = hose->pci_io;
 266
 267         /* Configure bus number registers */
 268         pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS,
 269                                    sub_bus - hose->first_busno);
 270
 271         if (pci_mem) {
 272                 /* Round memory allocator to 1MB boundary */
 273                 pciauto_region_align(pci_mem, 0x100000);
 274
 275                 pci_hose_write_config_word(hose, dev, PCI_MEMORY_LIMIT,
 276                                 (pci_mem->bus_lower - 1) >> 16);
 277         }
 278
 279         if (pci_prefetch) {
 280                 u16 prefechable_64;
 281
 282                 pci_hose_read_config_word(hose, dev,
 283                                         PCI_PREF_MEMORY_LIMIT,
 284                                         &prefechable_64);
 285                 prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
 286
 287                 /* Round memory allocator to 1MB boundary */
 288                 pciauto_region_align(pci_prefetch, 0x100000);
 289
 290                 pci_hose_write_config_word(hose, dev, PCI_PREF_MEMORY_LIMIT,
 291                                 (pci_prefetch->bus_lower - 1) >> 16);
 292                 if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
 293 #ifdef CONFIG_SYS_PCI_64BIT
 294                         pci_hose_write_config_dword(hose, dev,
 295                                         PCI_PREF_LIMIT_UPPER32,
 296                                         (pci_prefetch->bus_lower - 1) >> 32);
 297 #else
 298                         pci_hose_write_config_dword(hose, dev,
 299                                         PCI_PREF_LIMIT_UPPER32,
 300                                         0x0);
 301 #endif
 302         }
 303
 304         if (pci_io) {
 305                 /* Round I/O allocator to 4KB boundary */
 306                 pciauto_region_align(pci_io, 0x1000);
 307
 308                 pci_hose_write_config_byte(hose, dev, PCI_IO_LIMIT,
 309                                 ((pci_io->bus_lower - 1) & 0x0000f000) >> 8);
 310                 pci_hose_write_config_word(hose, dev, PCI_IO_LIMIT_UPPER16,
 311                                 ((pci_io->bus_lower - 1) & 0xffff0000) >> 16);
 312         }
 313 }
 314
 315
 316 /*
 317  * HJF: Changed this to return int. I think this is required
 318  * to get the correct result when scanning bridges
 319  */
 320 int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 321 {
 322         struct pci_region *pci_mem;
 323         struct pci_region *pci_prefetch;
 324         struct pci_region *pci_io;
 325         unsigned int sub_bus = PCI_BUS(dev);
 326         unsigned short class;
 327         int n;
 328
 329         pci_mem = hose->pci_mem;
 330         pci_prefetch = hose->pci_prefetch;
 331         pci_io = hose->pci_io;
 332
 333         pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 334
 335         switch (class) {
 336         case PCI_CLASS_BRIDGE_PCI:
 337                 debug("PCI Autoconfig: Found P2P bridge, device %d\n",
 338                       PCI_DEV(dev));
 339
 340                 pciauto_setup_device(hose, dev, 2, pci_mem,
 341                                      pci_prefetch, pci_io);
 342
 343                 /* Passing in current_busno allows for sibling P2P bridges */
 344                 hose->current_busno++;
 345                 pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);
 346                 /*
 347                  * need to figure out if this is a subordinate bridge on the bus
 348                  * to be able to properly set the pri/sec/sub bridge registers.
 349                  */
 350                 n = pci_hose_scan_bus(hose, hose->current_busno);
 351
 352                 /* figure out the deepest we've gone for this leg */
 353                 sub_bus = max((unsigned int)n, sub_bus);
 354                 pciauto_postscan_setup_bridge(hose, dev, sub_bus);
 355
 356                 sub_bus = hose->current_busno;
 357                 break;
 358
 359         case PCI_CLASS_BRIDGE_CARDBUS:
 360                 /*
 361                  * just do a minimal setup of the bridge,
 362                  * let the OS take care of the rest
 363                  */
 364                 pciauto_setup_device(hose, dev, 0, pci_mem,
 365                                      pci_prefetch, pci_io);
 366
 367                 debug("PCI Autoconfig: Found P2CardBus bridge, device %d\n",
 368                       PCI_DEV(dev));
 369
 370                 hose->current_busno++;
 371                 break;
 372
 373 #if defined(CONFIG_PCIAUTO_SKIP_HOST_BRIDGE)
 374         case PCI_CLASS_BRIDGE_OTHER:
 375                 debug("PCI Autoconfig: Skipping bridge device %d\n",
 376                       PCI_DEV(dev));
 377                 break;
 378 #endif
 379 #if defined(CONFIG_MPC834x) && !defined(CONFIG_VME8349)
 380         case PCI_CLASS_BRIDGE_OTHER:
 381                 /*
 382                  * The host/PCI bridge 1 seems broken in 8349 - it presents
 383                  * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
 384                  * device claiming resources io/mem/irq.. we only allow for
 385                  * the PIMMR window to be allocated (BAR0 - 1MB size)
 386                  */
 387                 debug("PCI Autoconfig: Broken bridge found, only minimal config\n");
 388                 pciauto_setup_device(hose, dev, 0, hose->pci_mem,
 389                         hose->pci_prefetch, hose->pci_io);
 390                 break;
 391 #endif
 392
 393         case PCI_CLASS_PROCESSOR_POWERPC: /* an agent or end-point */
 394                 debug("PCI AutoConfig: Found PowerPC device\n");
 395
 396         default:
 397                 pciauto_setup_device(hose, dev, 6, pci_mem,
 398                                      pci_prefetch, pci_io);
 399                 break;
 400         }
 401
 402         return sub_bus;
 403 }