drivers/sbus/sbus.c

   1 /* $Id: sbus.c,v 1.100 2002/01/24 15:36:24 davem Exp $
   2  * sbus.c:  SBus support routines.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/slab.h>
   9 #include <linux/config.h>
  10 #include <linux/init.h>
  11 #include <linux/pci.h>
  12
  13 #include <asm/system.h>
  14 #include <asm/sbus.h>
  15 #include <asm/dma.h>
  16 #include <asm/oplib.h>
  17 #include <asm/bpp.h>
  18 #include <asm/irq.h>
  19
  20 struct sbus_bus *sbus_root = NULL;
  21
  22 static struct linux_prom_irqs irqs[PROMINTR_MAX] __initdata = { { 0 } };
  23 #ifdef CONFIG_SPARC32
  24 static int interrupts[PROMINTR_MAX] __initdata = { 0 };
  25 #endif
  26
  27 #ifdef CONFIG_PCI
  28 extern int pcic_present(void);
  29 #endif
  30
  31 /* Perhaps when I figure out more about the iommu we'll put a
  32  * device registration routine here that probe_sbus() calls to
  33  * setup the iommu for each Sbus.
  34  */
  35
  36 /* We call this for each SBus device, and fill the structure based
  37  * upon the prom device tree.  We return the start of memory after
  38  * the things we have allocated.
  39  */
  40
  41 /* #define DEBUG_FILL */
  42
  43 static void __init fill_sbus_device(int prom_node, struct sbus_dev *sdev)
  44 {
  45         unsigned long address, base;
  46         int len;
  47
  48         sdev->prom_node = prom_node;
  49         prom_getstring(prom_node, "name",
  50                        sdev->prom_name, sizeof(sdev->prom_name));
  51         address = prom_getint(prom_node, "address");
  52         len = prom_getproperty(prom_node, "reg",
  53                                (char *) sdev->reg_addrs,
  54                                sizeof(sdev->reg_addrs));
  55         if (len == -1) {
  56                 sdev->num_registers = 0;
  57                 goto no_regs;
  58         }
  59
  60         if (len % sizeof(struct linux_prom_registers)) {
  61                 prom_printf("fill_sbus_device: proplen for regs of %s "
  62                             " was %d, need multiple of %d\n",
  63                             sdev->prom_name, len,
  64                             (int) sizeof(struct linux_prom_registers));
  65                 prom_halt();
  66         }
  67         if (len > (sizeof(struct linux_prom_registers) * PROMREG_MAX)) {
  68                 prom_printf("fill_sbus_device: Too many register properties "
  69                             "for device %s, len=%d\n",
  70                             sdev->prom_name, len);
  71                 prom_halt();
  72         }
  73         sdev->num_registers = len / sizeof(struct linux_prom_registers);
  74         sdev->ranges_applied = 0;
  75
  76         base = (unsigned long) sdev->reg_addrs[0].phys_addr;
  77
  78         /* Compute the slot number. */
  79         if (base >= SUN_SBUS_BVADDR && sparc_cpu_model == sun4m) {
  80                 sdev->slot = sbus_dev_slot(base);
  81         } else {
  82                 sdev->slot = sdev->reg_addrs[0].which_io;
  83         }
  84
  85 no_regs:
  86         len = prom_getproperty(prom_node, "ranges",
  87                                (char *)sdev->device_ranges,
  88                                sizeof(sdev->device_ranges));
  89         if (len == -1) {
  90                 sdev->num_device_ranges = 0;
  91                 goto no_ranges;
  92         }
  93         if (len % sizeof(struct linux_prom_ranges)) {
  94                 prom_printf("fill_sbus_device: proplen for ranges of %s "
  95                             " was %d, need multiple of %d\n",
  96                             sdev->prom_name, len,
  97                             (int) sizeof(struct linux_prom_ranges));
  98                 prom_halt();
  99         }
 100         if (len > (sizeof(struct linux_prom_ranges) * PROMREG_MAX)) {
 101                 prom_printf("fill_sbus_device: Too many range properties "
 102                             "for device %s, len=%d\n",
 103                             sdev->prom_name, len);
 104                 prom_halt();
 105         }
 106         sdev->num_device_ranges =
 107                 len / sizeof(struct linux_prom_ranges);
 108
 109 no_ranges:
 110         /* XXX Unfortunately, IRQ issues are very arch specific.
 111          * XXX Pull this crud out into an arch specific area
 112          * XXX at some point. -DaveM
 113          */
 114 #ifdef CONFIG_SPARC64
 115         len = prom_getproperty(prom_node, "interrupts",
 116                                (char *) irqs, sizeof(irqs));
 117         if (len == -1 || len == 0) {
 118                 sdev->irqs[0] = 0;
 119                 sdev->num_irqs = 0;
 120         } else {
 121                 unsigned int pri = irqs[0].pri;
 122
 123                 sdev->num_irqs = 1;
 124                 if (pri < 0x20)
 125                         pri += sdev->slot * 8;
 126
 127                 sdev->irqs[0] = sbus_build_irq(sdev->bus, pri);
 128         }
 129 #endif /* CONFIG_SPARC64 */
 130
 131 #ifdef CONFIG_SPARC32
 132         len = prom_getproperty(prom_node, "intr",
 133                                (char *)irqs, sizeof(irqs));
 134         if (len != -1) {
 135                 sdev->num_irqs = len / 8;
 136                 if (sdev->num_irqs == 0) {
 137                         sdev->irqs[0] = 0;
 138                 } else if (sparc_cpu_model == sun4d) {
 139                         extern unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq);
 140
 141                         for (len = 0; len < sdev->num_irqs; len++)
 142                                 sdev->irqs[len] = sun4d_build_irq(sdev, irqs[len].pri);
 143                 } else {
 144                         for (len = 0; len < sdev->num_irqs; len++)
 145                                 sdev->irqs[len] = irqs[len].pri;
 146                 }
 147         } else {
 148                 /* No "intr" node found-- check for "interrupts" node.
 149                  * This node contains SBus interrupt levels, not IPLs
 150                  * as in "intr", and no vector values.  We convert
 151                  * SBus interrupt levels to PILs (platform specific).
 152                  */
 153                 len = prom_getproperty(prom_node, "interrupts",
 154                                         (char *)interrupts, sizeof(interrupts));
 155                 if (len == -1) {
 156                         sdev->irqs[0] = 0;
 157                         sdev->num_irqs = 0;
 158                 } else {
 159                         sdev->num_irqs = len / sizeof(int);
 160                         for (len = 0; len < sdev->num_irqs; len++) {
 161                                 sdev->irqs[len] = sbint_to_irq(sdev, interrupts[len]);
 162                         }
 163                 }
 164         }
 165 #endif /* CONFIG_SPARC32 */
 166 }
 167
 168 /* This routine gets called from whoever needs the sbus first, to scan
 169  * the SBus device tree.  Currently it just prints out the devices
 170  * found on the bus and builds trees of SBUS structs and attached
 171  * devices.
 172  */
 173
 174 extern void iommu_init(int iommu_node, struct sbus_bus *sbus);
 175 extern void iounit_init(int sbi_node, int iounit_node, struct sbus_bus *sbus);
 176 void sun4_init(void);
 177 #ifdef CONFIG_SUN_AUXIO
 178 extern void auxio_probe(void);
 179 #endif
 180
 181 static void __init sbus_do_child_siblings(int start_node,
 182                                           struct sbus_dev *child,
 183                                           struct sbus_dev *parent,
 184                                           struct sbus_bus *sbus)
 185 {
 186         struct sbus_dev *this_dev = child;
 187         int this_node = start_node;
 188
 189         /* Child already filled in, just need to traverse siblings. */
 190         child->child = NULL;
 191         child->parent = parent;
 192         while((this_node = prom_getsibling(this_node)) != 0) {
 193                 this_dev->next = kmalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
 194                 this_dev = this_dev->next;
 195                 this_dev->next = NULL;
 196                 this_dev->parent = parent;
 197
 198                 this_dev->bus = sbus;
 199                 fill_sbus_device(this_node, this_dev);
 200
 201                 if(prom_getchild(this_node)) {
 202                         this_dev->child = kmalloc(sizeof(struct sbus_dev),
 203                                                   GFP_ATOMIC);
 204                         this_dev->child->bus = sbus;
 205                         this_dev->child->next = NULL;
 206                         fill_sbus_device(prom_getchild(this_node), this_dev->child);
 207                         sbus_do_child_siblings(prom_getchild(this_node),
 208                                                this_dev->child, this_dev, sbus);
 209                 } else {
 210                         this_dev->child = NULL;
 211                 }
 212         }
 213 }
 214
 215 /*
 216  * XXX This functions appears to be a distorted version of
 217  * prom_sbus_ranges_init(), with all sun4d stuff cut away.
 218  * Ask DaveM what is going on here, how is sun4d supposed to work... XXX
 219  */
 220 static void __init sbus_bus_ranges_init(int parent_node, struct sbus_bus *sbus)
 221 {
 222         int len;
 223
 224         len = prom_getproperty(sbus->prom_node, "ranges",
 225                                (char *) sbus->sbus_ranges,
 226                                sizeof(sbus->sbus_ranges));
 227         if (len == -1 || len == 0) {
 228                 sbus->num_sbus_ranges = 0;
 229                 return;
 230         }
 231         sbus->num_sbus_ranges = len / sizeof(struct linux_prom_ranges);
 232 }
 233
 234 static void __init __apply_ranges_to_regs(struct linux_prom_ranges *ranges,
 235                                           int num_ranges,
 236                                           struct linux_prom_registers *regs,
 237                                           int num_regs)
 238 {
 239         if (num_ranges) {
 240                 int regnum;
 241
 242                 for (regnum = 0; regnum < num_regs; regnum++) {
 243                         int rngnum;
 244
 245                         for (rngnum = 0; rngnum < num_ranges; rngnum++) {
 246                                 if (regs[regnum].which_io == ranges[rngnum].ot_child_space)
 247                                         break;
 248                         }
 249                         if (rngnum == num_ranges) {
 250                                 /* We used to flag this as an error.  Actually
 251                                  * some devices do not report the regs as we expect.
 252                                  * For example, see SUNW,pln device.  In that case
 253                                  * the reg property is in a format internal to that
 254                                  * node, ie. it is not in the SBUS register space
 255                                  * per se. -DaveM
 256                                  */
 257                                 return;
 258                         }
 259                         regs[regnum].which_io = ranges[rngnum].ot_parent_space;
 260                         regs[regnum].phys_addr -= ranges[rngnum].ot_child_base;
 261                         regs[regnum].phys_addr += ranges[rngnum].ot_parent_base;
 262                 }
 263         }
 264 }
 265
 266 static void __init __fixup_regs_sdev(struct sbus_dev *sdev)
 267 {
 268         if (sdev->num_registers != 0) {
 269                 struct sbus_dev *parent = sdev->parent;
 270                 int i;
 271
 272                 while (parent != NULL) {
 273                         __apply_ranges_to_regs(parent->device_ranges,
 274                                                parent->num_device_ranges,
 275                                                sdev->reg_addrs,
 276                                                sdev->num_registers);
 277
 278                         parent = parent->parent;
 279                 }
 280
 281                 __apply_ranges_to_regs(sdev->bus->sbus_ranges,
 282                                        sdev->bus->num_sbus_ranges,
 283                                        sdev->reg_addrs,
 284                                        sdev->num_registers);
 285
 286                 for (i = 0; i < sdev->num_registers; i++) {
 287                         struct resource *res = &sdev->resource[i];
 288
 289                         res->start = sdev->reg_addrs[i].phys_addr;
 290                         res->end = (res->start +
 291                                     (unsigned long)sdev->reg_addrs[i].reg_size - 1UL);
 292                         res->flags = IORESOURCE_IO |
 293                                 (sdev->reg_addrs[i].which_io & 0xff);
 294                 }
 295         }
 296 }
 297
 298 static void __init sbus_fixup_all_regs(struct sbus_dev *first_sdev)
 299 {
 300         struct sbus_dev *sdev;
 301
 302         for (sdev = first_sdev; sdev; sdev = sdev->next) {
 303                 if (sdev->child)
 304                         sbus_fixup_all_regs(sdev->child);
 305                 __fixup_regs_sdev(sdev);
 306         }
 307 }
 308
 309 extern void register_proc_sparc_ioport(void);
 310 extern void firetruck_init(void);
 311
 312 #ifdef CONFIG_SUN4
 313 extern void sun4_dvma_init(void);
 314 #endif
 315
 316 static int __init sbus_init(void)
 317 {
 318         int nd, this_sbus, sbus_devs, topnd, iommund;
 319         unsigned int sbus_clock;
 320         struct sbus_bus *sbus;
 321         struct sbus_dev *this_dev;
 322         int num_sbus = 0;  /* How many did we find? */
 323
 324 #ifdef CONFIG_SPARC32
 325         register_proc_sparc_ioport();
 326 #endif
 327
 328 #ifdef CONFIG_SUN4
 329         sun4_dvma_init();
 330         return 0;
 331 #endif
 332
 333         topnd = prom_getchild(prom_root_node);
 334
 335         /* Finding the first sbus is a special case... */
 336         iommund = 0;
 337         if(sparc_cpu_model == sun4u) {
 338                 nd = prom_searchsiblings(topnd, "sbus");
 339                 if(nd == 0) {
 340 #ifdef CONFIG_PCI
 341                         if (!pcic_present()) {
 342                                 prom_printf("Neither SBUS nor PCI found.\n");
 343                                 prom_halt();
 344                         } else {
 345 #ifdef CONFIG_SPARC64
 346                                 firetruck_init();
 347 #endif
 348                         }
 349                         return 0;
 350 #else
 351                         prom_printf("YEEE, UltraSparc sbus not found\n");
 352                         prom_halt();
 353 #endif
 354                 }
 355         } else if(sparc_cpu_model == sun4d) {
 356                 if((iommund = prom_searchsiblings(topnd, "io-unit")) == 0 ||
 357                    (nd = prom_getchild(iommund)) == 0 ||
 358                    (nd = prom_searchsiblings(nd, "sbi")) == 0) {
 359                         panic("sbi not found");
 360                 }
 361         } else if((nd = prom_searchsiblings(topnd, "sbus")) == 0) {
 362                 if((iommund = prom_searchsiblings(topnd, "iommu")) == 0 ||
 363                    (nd = prom_getchild(iommund)) == 0 ||
 364                    (nd = prom_searchsiblings(nd, "sbus")) == 0) {
 365 #ifdef CONFIG_PCI
 366                         if (!pcic_present()) {
 367                                 prom_printf("Neither SBUS nor PCI found.\n");
 368                                 prom_halt();
 369                         }
 370                         return 0;
 371 #else
 372                         /* No reason to run further - the data access trap will occur. */
 373                         panic("sbus not found");
 374 #endif
 375                 }
 376         }
 377
 378         /* Ok, we've found the first one, allocate first SBus struct
 379          * and place in chain.
 380          */
 381         sbus = sbus_root = kmalloc(sizeof(struct sbus_bus), GFP_ATOMIC);
 382         sbus->next = NULL;
 383         sbus->prom_node = nd;
 384         this_sbus = nd;
 385
 386         if(iommund && sparc_cpu_model != sun4u && sparc_cpu_model != sun4d)
 387                 iommu_init(iommund, sbus);
 388
 389         /* Loop until we find no more SBUS's */
 390         while(this_sbus) {
 391 #ifdef CONFIG_SPARC64
 392                 /* IOMMU hides inside SBUS/SYSIO prom node on Ultra. */
 393                 if(sparc_cpu_model == sun4u) {
 394                         extern void sbus_iommu_init(int prom_node, struct sbus_bus *sbus);
 395
 396                         sbus_iommu_init(this_sbus, sbus);
 397                 }
 398 #endif /* CONFIG_SPARC64 */
 399
 400 #ifdef CONFIG_SPARC32
 401                 if (sparc_cpu_model == sun4d)
 402                         iounit_init(this_sbus, iommund, sbus);
 403 #endif /* CONFIG_SPARC32 */
 404                 printk("sbus%d: ", num_sbus);
 405                 sbus_clock = prom_getint(this_sbus, "clock-frequency");
 406                 if(sbus_clock == -1)
 407                         sbus_clock = (25*1000*1000);
 408                 printk("Clock %d.%d MHz\n", (int) ((sbus_clock/1000)/1000),
 409                        (int) (((sbus_clock/1000)%1000 != 0) ?
 410                               (((sbus_clock/1000)%1000) + 1000) : 0));
 411
 412                 prom_getstring(this_sbus, "name",
 413                                sbus->prom_name, sizeof(sbus->prom_name));
 414                 sbus->clock_freq = sbus_clock;
 415 #ifdef CONFIG_SPARC32
 416                 if (sparc_cpu_model == sun4d) {
 417                         sbus->devid = prom_getint(iommund, "device-id");
 418                         sbus->board = prom_getint(iommund, "board#");
 419                 }
 420 #endif
 421
 422                 sbus_bus_ranges_init(iommund, sbus);
 423
 424                 sbus_devs = prom_getchild(this_sbus);
 425                 if (!sbus_devs) {
 426                         sbus->devices = NULL;
 427                         goto next_bus;
 428                 }
 429
 430                 sbus->devices = kmalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
 431
 432                 this_dev = sbus->devices;
 433                 this_dev->next = NULL;
 434
 435                 this_dev->bus = sbus;
 436                 this_dev->parent = NULL;
 437                 fill_sbus_device(sbus_devs, this_dev);
 438
 439                 /* Should we traverse for children? */
 440                 if(prom_getchild(sbus_devs)) {
 441                         /* Allocate device node */
 442                         this_dev->child = kmalloc(sizeof(struct sbus_dev),
 443                                                   GFP_ATOMIC);
 444                         /* Fill it */
 445                         this_dev->child->bus = sbus;
 446                         this_dev->child->next = NULL;
 447                         fill_sbus_device(prom_getchild(sbus_devs),
 448                                          this_dev->child);
 449                         sbus_do_child_siblings(prom_getchild(sbus_devs),
 450                                                this_dev->child,
 451                                                this_dev,
 452                                                sbus);
 453                 } else {
 454                         this_dev->child = NULL;
 455                 }
 456
 457                 while((sbus_devs = prom_getsibling(sbus_devs)) != 0) {
 458                         /* Allocate device node */
 459                         this_dev->next = kmalloc(sizeof(struct sbus_dev),
 460                                                  GFP_ATOMIC);
 461                         this_dev = this_dev->next;
 462                         this_dev->next = NULL;
 463
 464                         /* Fill it */
 465                         this_dev->bus = sbus;
 466                         this_dev->parent = NULL;
 467                         fill_sbus_device(sbus_devs, this_dev);
 468
 469                         /* Is there a child node hanging off of us? */
 470                         if(prom_getchild(sbus_devs)) {
 471                                 /* Get new device struct */
 472                                 this_dev->child = kmalloc(sizeof(struct sbus_dev),
 473                                                           GFP_ATOMIC);
 474                                 /* Fill it */
 475                                 this_dev->child->bus = sbus;
 476                                 this_dev->child->next = NULL;
 477                                 fill_sbus_device(prom_getchild(sbus_devs),
 478                                                  this_dev->child);
 479                                 sbus_do_child_siblings(prom_getchild(sbus_devs),
 480                                                        this_dev->child,
 481                                                        this_dev,
 482                                                        sbus);
 483                         } else {
 484                                 this_dev->child = NULL;
 485                         }
 486                 }
 487
 488                 /* Walk all devices and apply parent ranges. */
 489                 sbus_fixup_all_regs(sbus->devices);
 490
 491                 dvma_init(sbus);
 492         next_bus:
 493                 num_sbus++;
 494                 if(sparc_cpu_model == sun4u) {
 495                         this_sbus = prom_getsibling(this_sbus);
 496                         if(!this_sbus)
 497                                 break;
 498                         this_sbus = prom_searchsiblings(this_sbus, "sbus");
 499                 } else if(sparc_cpu_model == sun4d) {
 500                         iommund = prom_getsibling(iommund);
 501                         if(!iommund)
 502                                 break;
 503                         iommund = prom_searchsiblings(iommund, "io-unit");
 504                         if(!iommund)
 505                                 break;
 506                         this_sbus = prom_searchsiblings(prom_getchild(iommund), "sbi");
 507                 } else {
 508                         this_sbus = prom_getsibling(this_sbus);
 509                         if(!this_sbus)
 510                                 break;
 511                         this_sbus = prom_searchsiblings(this_sbus, "sbus");
 512                 }
 513                 if(this_sbus) {
 514                         sbus->next = kmalloc(sizeof(struct sbus_bus), GFP_ATOMIC);
 515                         sbus = sbus->next;
 516                         sbus->next = NULL;
 517                         sbus->prom_node = this_sbus;
 518                 } else {
 519                         break;
 520                 }
 521         } /* while(this_sbus) */
 522
 523         if (sparc_cpu_model == sun4d) {
 524                 extern void sun4d_init_sbi_irq(void);
 525                 sun4d_init_sbi_irq();
 526         }
 527
 528 #ifdef CONFIG_SPARC64
 529         if (sparc_cpu_model == sun4u) {
 530                 firetruck_init();
 531         }
 532 #endif
 533 #ifdef CONFIG_SUN_AUXIO
 534         if (sparc_cpu_model == sun4u)
 535                 auxio_probe ();
 536 #endif
 537 #ifdef CONFIG_SPARC64
 538         if (sparc_cpu_model == sun4u) {
 539                 extern void clock_probe(void);
 540
 541                 clock_probe();
 542         }
 543 #endif
 544
 545         return 0;
 546 }
 547
 548 subsys_initcall(sbus_init);