arch/mips/pci/pci-ip27.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2003 Christoph Hellwig (hch@lst.de)
   7  * Copyright (C) 1999, 2000, 04 Ralf Baechle (ralf@linux-mips.org)
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  */
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/pci.h>
  13 #include <asm/sn/arch.h>
  14 #include <asm/pci/bridge.h>
  15 #include <asm/paccess.h>
  16 #include <asm/sn/intr.h>
  17 #include <asm/sn/sn0/hub.h>
  18
  19 extern unsigned int allocate_irqno(void);
  20
  21 /*
  22  * Max #PCI busses we can handle; ie, max #PCI bridges.
  23  */
  24 #define MAX_PCI_BUSSES          40
  25
  26 /*
  27  * Max #PCI devices (like scsi controllers) we handle on a bus.
  28  */
  29 #define MAX_DEVICES_PER_PCIBUS  8
  30
  31 /*
  32  * XXX: No kmalloc available when we do our crosstalk scan,
  33  *      we should try to move it later in the boot process.
  34  */
  35 static struct bridge_controller bridges[MAX_PCI_BUSSES];
  36
  37 /*
  38  * Translate from irq to software PCI bus number and PCI slot.
  39  */
  40 struct bridge_controller *irq_to_bridge[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
  41 int irq_to_slot[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
  42
  43 /*
  44  * The Bridge ASIC supports both type 0 and type 1 access.  Type 1 is
  45  * not really documented, so right now I can't write code which uses it.
  46  * Therefore we use type 0 accesses for now even though they won't work
  47  * correcly for PCI-to-PCI bridges.
  48  *
  49  * The function is complicated by the ultimate brokeness of the IOC3 chip
  50  * which is used in SGI systems.  The IOC3 can only handle 32-bit PCI
  51  * accesses and does only decode parts of it's address space.
  52  */
  53
  54 static int pci_conf0_read_config(struct pci_bus *bus, unsigned int devfn,
  55                                  int where, int size, u32 * value)
  56 {
  57         struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
  58         bridge_t *bridge = bc->base;
  59         int slot = PCI_SLOT(devfn);
  60         int fn = PCI_FUNC(devfn);
  61         volatile void *addr;
  62         u32 cf, shift, mask;
  63         int res;
  64
  65         addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID];
  66         if (get_dbe(cf, (u32 *) addr))
  67                 return PCIBIOS_DEVICE_NOT_FOUND;
  68
  69         /*
  70          * IOC3 is fucked fucked beyond believe ...  Don't even give the
  71          * generic PCI code a chance to look at it for real ...
  72          */
  73         if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
  74                 goto oh_my_gawd;
  75
  76         addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)];
  77
  78         if (size == 1)
  79                 res = get_dbe(*value, (u8 *) addr);
  80         else if (size == 2)
  81                 res = get_dbe(*value, (u16 *) addr);
  82         else
  83                 res = get_dbe(*value, (u32 *) addr);
  84
  85         return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
  86
  87 oh_my_gawd:
  88
  89         /*
  90          * IOC3 is fucked fucked beyond believe ...  Don't even give the
  91          * generic PCI code a chance to look at the wrong register.
  92          */
  93         if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
  94                 *value = 0;
  95                 return PCIBIOS_SUCCESSFUL;
  96         }
  97
  98         /*
  99          * IOC3 is fucked fucked beyond believe ...  Don't try to access
 100          * anything but 32-bit words ...
 101          */
 102         addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
 103
 104         if (get_dbe(cf, (u32 *) addr))
 105                 return PCIBIOS_DEVICE_NOT_FOUND;
 106
 107         shift = ((where & 3) << 3);
 108         mask = (0xffffffffU >> ((4 - size) << 3));
 109         *value = (cf >> shift) & mask;
 110
 111         return PCIBIOS_SUCCESSFUL;
 112 }
 113
 114 static int pci_conf1_read_config(struct pci_bus *bus, unsigned int devfn,
 115                                  int where, int size, u32 * value)
 116 {
 117         struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
 118         bridge_t *bridge = bc->base;
 119         int busno = bus->number;
 120         int slot = PCI_SLOT(devfn);
 121         int fn = PCI_FUNC(devfn);
 122         volatile void *addr;
 123         u32 cf, shift, mask;
 124         int res;
 125
 126         bridge->b_pci_cfg = (busno << 16) | (slot << 11);
 127         addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID];
 128         if (get_dbe(cf, (u32 *) addr))
 129                 return PCIBIOS_DEVICE_NOT_FOUND;
 130
 131         /*
 132          * IOC3 is fucked fucked beyond believe ...  Don't even give the
 133          * generic PCI code a chance to look at it for real ...
 134          */
 135         if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
 136                 goto oh_my_gawd;
 137
 138         bridge->b_pci_cfg = (busno << 16) | (slot << 11);
 139         addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))];
 140
 141         if (size == 1)
 142                 res = get_dbe(*value, (u8 *) addr);
 143         else if (size == 2)
 144                 res = get_dbe(*value, (u16 *) addr);
 145         else
 146                 res = get_dbe(*value, (u32 *) addr);
 147
 148         return res ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
 149
 150 oh_my_gawd:
 151
 152         /*
 153          * IOC3 is fucked fucked beyond believe ...  Don't even give the
 154          * generic PCI code a chance to look at the wrong register.
 155          */
 156         if ((where >= 0x14 && where < 0x40) || (where >= 0x48)) {
 157                 *value = 0;
 158                 return PCIBIOS_SUCCESSFUL;
 159         }
 160
 161         /*
 162          * IOC3 is fucked fucked beyond believe ...  Don't try to access
 163          * anything but 32-bit words ...
 164          */
 165         bridge->b_pci_cfg = (busno << 16) | (slot << 11);
 166         addr = &bridge->b_type1_cfg.c[(fn << 8) | where];
 167
 168         if (get_dbe(cf, (u32 *) addr))
 169                 return PCIBIOS_DEVICE_NOT_FOUND;
 170
 171         shift = ((where & 3) << 3);
 172         mask = (0xffffffffU >> ((4 - size) << 3));
 173         *value = (cf >> shift) & mask;
 174
 175         return PCIBIOS_SUCCESSFUL;
 176 }
 177
 178 static int pci_read_config(struct pci_bus *bus, unsigned int devfn,
 179                            int where, int size, u32 * value)
 180 {
 181         if (bus->number > 0)
 182                 return pci_conf1_read_config(bus, devfn, where, size, value);
 183
 184         return pci_conf0_read_config(bus, devfn, where, size, value);
 185 }
 186
 187 static int pci_conf0_write_config(struct pci_bus *bus, unsigned int devfn,
 188                                   int where, int size, u32 value)
 189 {
 190         struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
 191         bridge_t *bridge = bc->base;
 192         int slot = PCI_SLOT(devfn);
 193         int fn = PCI_FUNC(devfn);
 194         volatile void *addr;
 195         u32 cf, shift, mask, smask;
 196         int res;
 197
 198         addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[PCI_VENDOR_ID];
 199         if (get_dbe(cf, (u32 *) addr))
 200                 return PCIBIOS_DEVICE_NOT_FOUND;
 201
 202         /*
 203          * IOC3 is fucked fucked beyond believe ...  Don't even give the
 204          * generic PCI code a chance to look at it for real ...
 205          */
 206         if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
 207                 goto oh_my_gawd;
 208
 209         addr = &bridge->b_type0_cfg_dev[slot].f[fn].c[where ^ (4 - size)];
 210
 211         if (size == 1) {
 212                 res = put_dbe(value, (u8 *) addr);
 213         } else if (size == 2) {
 214                 res = put_dbe(value, (u16 *) addr);
 215         } else {
 216                 res = put_dbe(value, (u32 *) addr);
 217         }
 218
 219         if (res)
 220                 return PCIBIOS_DEVICE_NOT_FOUND;
 221
 222         return PCIBIOS_SUCCESSFUL;
 223
 224 oh_my_gawd:
 225
 226         /*
 227          * IOC3 is fucked fucked beyond believe ...  Don't even give the
 228          * generic PCI code a chance to touch the wrong register.
 229          */
 230         if ((where >= 0x14 && where < 0x40) || (where >= 0x48))
 231                 return PCIBIOS_SUCCESSFUL;
 232
 233         /*
 234          * IOC3 is fucked fucked beyond believe ...  Don't try to access
 235          * anything but 32-bit words ...
 236          */
 237         addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
 238
 239         if (get_dbe(cf, (u32 *) addr))
 240                 return PCIBIOS_DEVICE_NOT_FOUND;
 241
 242         shift = ((where & 3) << 3);
 243         mask = (0xffffffffU >> ((4 - size) << 3));
 244         smask = mask << shift;
 245
 246         cf = (cf & ~smask) | ((value & mask) << shift);
 247         if (put_dbe(cf, (u32 *) addr))
 248                 return PCIBIOS_DEVICE_NOT_FOUND;
 249
 250         return PCIBIOS_SUCCESSFUL;
 251 }
 252
 253 static int pci_conf1_write_config(struct pci_bus *bus, unsigned int devfn,
 254                                   int where, int size, u32 value)
 255 {
 256         struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
 257         bridge_t *bridge = bc->base;
 258         int slot = PCI_SLOT(devfn);
 259         int fn = PCI_FUNC(devfn);
 260         int busno = bus->number;
 261         volatile void *addr;
 262         u32 cf, shift, mask, smask;
 263         int res;
 264
 265         bridge->b_pci_cfg = (busno << 16) | (slot << 11);
 266         addr = &bridge->b_type1_cfg.c[(fn << 8) | PCI_VENDOR_ID];
 267         if (get_dbe(cf, (u32 *) addr))
 268                 return PCIBIOS_DEVICE_NOT_FOUND;
 269
 270         /*
 271          * IOC3 is fucked fucked beyond believe ...  Don't even give the
 272          * generic PCI code a chance to look at it for real ...
 273          */
 274         if (cf == (PCI_VENDOR_ID_SGI | (PCI_DEVICE_ID_SGI_IOC3 << 16)))
 275                 goto oh_my_gawd;
 276
 277         addr = &bridge->b_type1_cfg.c[(fn << 8) | (where ^ (4 - size))];
 278
 279         if (size == 1) {
 280                 res = put_dbe(value, (u8 *) addr);
 281         } else if (size == 2) {
 282                 res = put_dbe(value, (u16 *) addr);
 283         } else {
 284                 res = put_dbe(value, (u32 *) addr);
 285         }
 286
 287         if (res)
 288                 return PCIBIOS_DEVICE_NOT_FOUND;
 289
 290         return PCIBIOS_SUCCESSFUL;
 291
 292 oh_my_gawd:
 293
 294         /*
 295          * IOC3 is fucked fucked beyond believe ...  Don't even give the
 296          * generic PCI code a chance to touch the wrong register.
 297          */
 298         if ((where >= 0x14 && where < 0x40) || (where >= 0x48))
 299                 return PCIBIOS_SUCCESSFUL;
 300
 301         /*
 302          * IOC3 is fucked fucked beyond believe ...  Don't try to access
 303          * anything but 32-bit words ...
 304          */
 305         addr = &bridge->b_type0_cfg_dev[slot].f[fn].l[where >> 2];
 306
 307         if (get_dbe(cf, (u32 *) addr))
 308                 return PCIBIOS_DEVICE_NOT_FOUND;
 309
 310         shift = ((where & 3) << 3);
 311         mask = (0xffffffffU >> ((4 - size) << 3));
 312         smask = mask << shift;
 313
 314         cf = (cf & ~smask) | ((value & mask) << shift);
 315         if (put_dbe(cf, (u32 *) addr))
 316                 return PCIBIOS_DEVICE_NOT_FOUND;
 317
 318         return PCIBIOS_SUCCESSFUL;
 319 }
 320
 321 static int pci_write_config(struct pci_bus *bus, unsigned int devfn,
 322         int where, int size, u32 value)
 323 {
 324         if (bus->number > 0)
 325                 return pci_conf1_write_config(bus, devfn, where, size, value);
 326
 327         return pci_conf0_write_config(bus, devfn, where, size, value);
 328 }
 329
 330 static struct pci_ops bridge_pci_ops = {
 331         .read = pci_read_config,
 332         .write = pci_write_config,
 333 };
 334
 335 int __init bridge_probe(nasid_t nasid, int widget_id, int masterwid)
 336 {
 337         unsigned long offset = NODE_OFFSET(nasid);
 338         struct bridge_controller *bc;
 339         static int num_bridges = 0;
 340         bridge_t *bridge;
 341         int slot;
 342
 343         printk("a bridge\n");
 344
 345         /* XXX: kludge alert.. */
 346         if (!num_bridges)
 347                 ioport_resource.end = ~0UL;
 348
 349         bc = &bridges[num_bridges];
 350
 351         bc->pc.pci_ops          = &bridge_pci_ops;
 352         bc->pc.mem_resource     = &bc->mem;
 353         bc->pc.io_resource      = &bc->io;
 354
 355         bc->pc.index            = num_bridges;
 356
 357         bc->mem.name            = "Bridge PCI MEM";
 358         bc->pc.mem_offset       = offset;
 359         bc->mem.start           = 0;
 360         bc->mem.end             = ~0UL;
 361         bc->mem.flags           = IORESOURCE_MEM;
 362
 363         bc->io.name             = "Bridge IO MEM";
 364         bc->pc.io_offset        = offset;
 365         bc->io.start            = 0UL;
 366         bc->io.end              = ~0UL;
 367         bc->io.flags            = IORESOURCE_IO;
 368
 369         bc->irq_cpu = smp_processor_id();
 370         bc->widget_id = widget_id;
 371         bc->nasid = nasid;
 372
 373         bc->baddr = (u64)masterwid << 60;
 374         bc->baddr |= (1UL << 56);       /* Barrier set */
 375
 376         /*
 377          * point to this bridge
 378          */
 379         bridge = (bridge_t *) RAW_NODE_SWIN_BASE(nasid, widget_id);
 380
 381         /*
 382          * Clear all pending interrupts.
 383          */
 384         bridge->b_int_rst_stat = BRIDGE_IRR_ALL_CLR;
 385
 386         /*
 387          * Until otherwise set up, assume all interrupts are from slot 0
 388          */
 389         bridge->b_int_device = 0x0;
 390
 391         /*
 392          * swap pio's to pci mem and io space (big windows)
 393          */
 394         bridge->b_wid_control |= BRIDGE_CTRL_IO_SWAP |
 395                                  BRIDGE_CTRL_MEM_SWAP;
 396
 397         /*
 398          * Hmm...  IRIX sets additional bits in the address which
 399          * are documented as reserved in the bridge docs.
 400          */
 401         bridge->b_wid_int_upper = 0x8000 | (masterwid << 16);
 402         bridge->b_wid_int_lower = 0x01800090;   /* PI_INT_PEND_MOD off*/
 403         bridge->b_dir_map = (masterwid << 20);  /* DMA */
 404         bridge->b_int_enable = 0;
 405
 406         for (slot = 0; slot < 8; slot ++) {
 407                 bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR;
 408                 bc->pci_int[slot] = -1;
 409         }
 410         bridge->b_wid_tflush;     /* wait until Bridge PIO complete */
 411
 412         bc->base = bridge;
 413
 414         register_pci_controller(&bc->pc);
 415
 416         num_bridges++;
 417
 418         return 0;
 419 }
 420
 421 /*
 422  * All observed requests have pin == 1. We could have a global here, that
 423  * gets incremented and returned every time - unfortunately, pci_map_irq
 424  * may be called on the same device over and over, and need to return the
 425  * same value. On O2000, pin can be 0 or 1, and PCI slots can be [0..7].
 426  *
 427  * A given PCI device, in general, should be able to intr any of the cpus
 428  * on any one of the hubs connected to its xbow.
 429  */
 430 int __devinit pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 431 {
 432         struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
 433         int irq = bc->pci_int[slot];
 434
 435         if (irq == -1) {
 436                 irq = bc->pci_int[slot] = request_bridge_irq(bc);
 437                 if (irq < 0)
 438                         panic("Can't allocate interrupt for PCI device %s\n",
 439                               pci_name(dev));
 440         }
 441
 442         irq_to_bridge[irq] = bc;
 443         irq_to_slot[irq] = slot;
 444
 445         return irq;
 446 }
 447
 448 /* Do platform specific device initialization at pci_enable_device() time */
 449 int pcibios_plat_dev_init(struct pci_dev *dev)
 450 {
 451         return 0;
 452 }
 453
 454 /*
 455  * Device might live on a subordinate PCI bus.  XXX Walk up the chain of buses
 456  * to find the slot number in sense of the bridge device register.
 457  * XXX This also means multiple devices might rely on conflicting bridge
 458  * settings.
 459  */
 460
 461 static inline void pci_disable_swapping(struct pci_dev *dev)
 462 {
 463         struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
 464         bridge_t *bridge = bc->base;
 465         int slot = PCI_SLOT(dev->devfn);
 466
 467         /* Turn off byte swapping */
 468         bridge->b_device[slot].reg &= ~BRIDGE_DEV_SWAP_DIR;
 469         bridge->b_widget.w_tflush;      /* Flush */
 470 }
 471
 472 static inline void pci_enable_swapping(struct pci_dev *dev)
 473 {
 474         struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
 475         bridge_t *bridge = bc->base;
 476         int slot = PCI_SLOT(dev->devfn);
 477
 478         /* Turn on byte swapping */
 479         bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR;
 480         bridge->b_widget.w_tflush;      /* Flush */
 481 }
 482
 483 static void __init pci_fixup_ioc3(struct pci_dev *d)
 484 {
 485         pci_disable_swapping(d);
 486 }
 487
 488 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,
 489         pci_fixup_ioc3);