arch/sparc64/kernel/central.c

   1 /* $Id: central.c,v 1.14 2000/09/21 06:25:14 anton Exp $
   2  * central.c: Central FHC driver for Sunfire/Starfire/Wildfire.
   3  *
   4  * Copyright (C) 1997, 1999 David S. Miller (davem@redhat.com)
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/types.h>
   9 #include <linux/string.h>
  10 #include <linux/timer.h>
  11 #include <linux/sched.h>
  12 #include <linux/delay.h>
  13 #include <linux/init.h>
  14 #include <linux/bootmem.h>
  15
  16 #include <asm/page.h>
  17 #include <asm/fhc.h>
  18 #include <asm/starfire.h>
  19
  20 struct linux_central *central_bus = NULL;
  21 struct linux_fhc *fhc_list = NULL;
  22
  23 #define IS_CENTRAL_FHC(__fhc)   ((__fhc) == central_bus->child)
  24
  25 static inline unsigned long long_align(unsigned long addr)
  26 {
  27         return ((addr + (sizeof(unsigned long) - 1)) &
  28                 ~(sizeof(unsigned long) - 1));
  29 }
  30
  31 static void central_ranges_init(int cnode, struct linux_central *central)
  32 {
  33         int success;
  34
  35         central->num_central_ranges = 0;
  36         success = prom_getproperty(central->prom_node, "ranges",
  37                                    (char *) central->central_ranges,
  38                                    sizeof (central->central_ranges));
  39         if (success != -1)
  40                 central->num_central_ranges = (success/sizeof(struct linux_prom_ranges));
  41 }
  42
  43 static void fhc_ranges_init(int fnode, struct linux_fhc *fhc)
  44 {
  45         int success;
  46
  47         fhc->num_fhc_ranges = 0;
  48         success = prom_getproperty(fhc->prom_node, "ranges",
  49                                    (char *) fhc->fhc_ranges,
  50                                    sizeof (fhc->fhc_ranges));
  51         if (success != -1)
  52                 fhc->num_fhc_ranges = (success/sizeof(struct linux_prom_ranges));
  53 }
  54
  55 /* Range application routines are exported to various drivers,
  56  * so do not __init this.
  57  */
  58 static void adjust_regs(struct linux_prom_registers *regp, int nregs,
  59                         struct linux_prom_ranges *rangep, int nranges)
  60 {
  61         int regc, rngc;
  62
  63         for (regc = 0; regc < nregs; regc++) {
  64                 for (rngc = 0; rngc < nranges; rngc++)
  65                         if (regp[regc].which_io == rangep[rngc].ot_child_space)
  66                                 break; /* Fount it */
  67                 if (rngc == nranges) /* oops */
  68                         prom_printf("adjust_regs: Could not find range with matching bus type...\n");
  69                 regp[regc].which_io = rangep[rngc].ot_parent_space;
  70                 regp[regc].phys_addr += rangep[rngc].ot_parent_base;
  71         }
  72 }
  73
  74 /* Apply probed fhc ranges to registers passed, if no ranges return. */
  75 void apply_fhc_ranges(struct linux_fhc *fhc,
  76                       struct linux_prom_registers *regs,
  77                       int nregs)
  78 {
  79         if(fhc->num_fhc_ranges)
  80                 adjust_regs(regs, nregs, fhc->fhc_ranges,
  81                             fhc->num_fhc_ranges);
  82 }
  83
  84 /* Apply probed central ranges to registers passed, if no ranges return. */
  85 void apply_central_ranges(struct linux_central *central,
  86                           struct linux_prom_registers *regs, int nregs)
  87 {
  88         if(central->num_central_ranges)
  89                 adjust_regs(regs, nregs, central->central_ranges,
  90                             central->num_central_ranges);
  91 }
  92
  93 void * __init central_alloc_bootmem(unsigned long size)
  94 {
  95         void *ret;
  96
  97         ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
  98         if (ret != NULL)
  99                 memset(ret, 0, size);
 100
 101         return ret;
 102 }
 103
 104 static void probe_other_fhcs(void)
 105 {
 106         struct linux_prom64_registers fpregs[6];
 107         char namebuf[128];
 108         int node;
 109
 110         node = prom_getchild(prom_root_node);
 111         node = prom_searchsiblings(node, "fhc");
 112         if (node == 0) {
 113                 prom_printf("FHC: Cannot find any toplevel firehose controllers.\n");
 114                 prom_halt();
 115         }
 116         while(node) {
 117                 struct linux_fhc *fhc;
 118                 int board;
 119                 u32 tmp;
 120
 121                 fhc = (struct linux_fhc *)
 122                         central_alloc_bootmem(sizeof(struct linux_fhc));
 123                 if (fhc == NULL) {
 124                         prom_printf("probe_other_fhcs: Cannot alloc fhc.\n");
 125                         prom_halt();
 126                 }
 127
 128                 /* Link it into the FHC chain. */
 129                 fhc->next = fhc_list;
 130                 fhc_list = fhc;
 131
 132                 /* Toplevel FHCs have no parent. */
 133                 fhc->parent = NULL;
 134
 135                 fhc->prom_node = node;
 136                 prom_getstring(node, "name", namebuf, sizeof(namebuf));
 137                 strcpy(fhc->prom_name, namebuf);
 138                 fhc_ranges_init(node, fhc);
 139
 140                 /* Non-central FHC's have 64-bit OBP format registers. */
 141                 if(prom_getproperty(node, "reg",
 142                                     (char *)&fpregs[0], sizeof(fpregs)) == -1) {
 143                         prom_printf("FHC: Fatal error, cannot get fhc regs.\n");
 144                         prom_halt();
 145                 }
 146
 147                 /* Only central FHC needs special ranges applied. */
 148                 fhc->fhc_regs.pregs = fpregs[0].phys_addr;
 149                 fhc->fhc_regs.ireg = fpregs[1].phys_addr;
 150                 fhc->fhc_regs.ffregs = fpregs[2].phys_addr;
 151                 fhc->fhc_regs.sregs = fpregs[3].phys_addr;
 152                 fhc->fhc_regs.uregs = fpregs[4].phys_addr;
 153                 fhc->fhc_regs.tregs = fpregs[5].phys_addr;
 154
 155                 board = prom_getintdefault(node, "board#", -1);
 156                 fhc->board = board;
 157
 158                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_JCTRL);
 159                 if((tmp & FHC_JTAG_CTRL_MENAB) != 0)
 160                         fhc->jtag_master = 1;
 161                 else
 162                         fhc->jtag_master = 0;
 163
 164                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);
 165                 printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] %s\n",
 166                        board,
 167                        (tmp & FHC_ID_VERS) >> 28,
 168                        (tmp & FHC_ID_PARTID) >> 12,
 169                        (tmp & FHC_ID_MANUF) >> 1,
 170                        (fhc->jtag_master ? "(JTAG Master)" : ""));
 171
 172                 /* This bit must be set in all non-central FHC's in
 173                  * the system.  When it is clear, this identifies
 174                  * the central board.
 175                  */
 176                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 177                 tmp |= FHC_CONTROL_IXIST;
 178                 upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 179
 180                 /* Look for the next FHC. */
 181                 node = prom_getsibling(node);
 182                 if(node == 0)
 183                         break;
 184                 node = prom_searchsiblings(node, "fhc");
 185                 if(node == 0)
 186                         break;
 187         }
 188 }
 189
 190 static void probe_clock_board(struct linux_central *central,
 191                               struct linux_fhc *fhc,
 192                               int cnode, int fnode)
 193 {
 194         struct linux_prom_registers cregs[3];
 195         int clknode, nslots, tmp, nregs;
 196
 197         clknode = prom_searchsiblings(prom_getchild(fnode), "clock-board");
 198         if(clknode == 0 || clknode == -1) {
 199                 prom_printf("Critical error, central lacks clock-board.\n");
 200                 prom_halt();
 201         }
 202         nregs = prom_getproperty(clknode, "reg", (char *)&cregs[0], sizeof(cregs));
 203         if (nregs == -1) {
 204                 prom_printf("CENTRAL: Fatal error, cannot map clock-board regs.\n");
 205                 prom_halt();
 206         }
 207         nregs /= sizeof(struct linux_prom_registers);
 208         apply_fhc_ranges(fhc, &cregs[0], nregs);
 209         apply_central_ranges(central, &cregs[0], nregs);
 210         central->cfreg = ((((unsigned long)cregs[0].which_io) << 32UL) |
 211                           ((unsigned long)cregs[0].phys_addr));
 212         central->clkregs = ((((unsigned long)cregs[1].which_io) << 32UL) |
 213                             ((unsigned long)cregs[1].phys_addr));
 214
 215         if(nregs == 2)
 216                 central->clkver = 0UL;
 217         else
 218                 central->clkver = ((((unsigned long)cregs[2].which_io) << 32UL) |
 219                                    ((unsigned long)cregs[2].phys_addr));
 220
 221         tmp = upa_readb(central->clkregs + CLOCK_STAT1);
 222         tmp &= 0xc0;
 223         switch(tmp) {
 224         case 0x40:
 225                 nslots = 16;
 226                 break;
 227         case 0xc0:
 228                 nslots = 8;
 229                 break;
 230         case 0x80:
 231                 if(central->clkver != 0UL &&
 232                    upa_readb(central->clkver) != 0) {
 233                         if((upa_readb(central->clkver) & 0x80) != 0)
 234                                 nslots = 4;
 235                         else
 236                                 nslots = 5;
 237                         break;
 238                 }
 239         default:
 240                 nslots = 4;
 241                 break;
 242         };
 243         central->slots = nslots;
 244         printk("CENTRAL: Detected %d slot Enterprise system. cfreg[%02x] cver[%02x]\n",
 245                central->slots, upa_readb(central->cfreg),
 246                (central->clkver ? upa_readb(central->clkver) : 0x00));
 247 }
 248
 249 void central_probe(void)
 250 {
 251         struct linux_prom_registers fpregs[6];
 252         struct linux_fhc *fhc;
 253         char namebuf[128];
 254         int cnode, fnode, err;
 255
 256         cnode = prom_finddevice("/central");
 257         if(cnode == 0 || cnode == -1) {
 258                 if (this_is_starfire)
 259                         starfire_cpu_setup();
 260                 return;
 261         }
 262
 263         /* Ok we got one, grab some memory for software state. */
 264         central_bus = (struct linux_central *)
 265                 central_alloc_bootmem(sizeof(struct linux_central));
 266         if (central_bus == NULL) {
 267                 prom_printf("central_probe: Cannot alloc central_bus.\n");
 268                 prom_halt();
 269         }
 270
 271         fhc = (struct linux_fhc *)
 272                 central_alloc_bootmem(sizeof(struct linux_fhc));
 273         if (fhc == NULL) {
 274                 prom_printf("central_probe: Cannot alloc central fhc.\n");
 275                 prom_halt();
 276         }
 277
 278         /* First init central. */
 279         central_bus->child = fhc;
 280         central_bus->prom_node = cnode;
 281
 282         prom_getstring(cnode, "name", namebuf, sizeof(namebuf));
 283         strcpy(central_bus->prom_name, namebuf);
 284
 285         central_ranges_init(cnode, central_bus);
 286
 287         /* And then central's FHC. */
 288         fhc->next = fhc_list;
 289         fhc_list = fhc;
 290
 291         fhc->parent = central_bus;
 292         fnode = prom_searchsiblings(prom_getchild(cnode), "fhc");
 293         if(fnode == 0 || fnode == -1) {
 294                 prom_printf("Critical error, central board lacks fhc.\n");
 295                 prom_halt();
 296         }
 297         fhc->prom_node = fnode;
 298         prom_getstring(fnode, "name", namebuf, sizeof(namebuf));
 299         strcpy(fhc->prom_name, namebuf);
 300
 301         fhc_ranges_init(fnode, fhc);
 302
 303         /* Now, map in FHC register set. */
 304         if (prom_getproperty(fnode, "reg", (char *)&fpregs[0], sizeof(fpregs)) == -1) {
 305                 prom_printf("CENTRAL: Fatal error, cannot get fhc regs.\n");
 306                 prom_halt();
 307         }
 308         apply_central_ranges(central_bus, &fpregs[0], 6);
 309
 310         fhc->fhc_regs.pregs = ((((unsigned long)fpregs[0].which_io)<<32UL) |
 311                                ((unsigned long)fpregs[0].phys_addr));
 312         fhc->fhc_regs.ireg = ((((unsigned long)fpregs[1].which_io)<<32UL) |
 313                               ((unsigned long)fpregs[1].phys_addr));
 314         fhc->fhc_regs.ffregs = ((((unsigned long)fpregs[2].which_io)<<32UL) |
 315                                 ((unsigned long)fpregs[2].phys_addr));
 316         fhc->fhc_regs.sregs = ((((unsigned long)fpregs[3].which_io)<<32UL) |
 317                                ((unsigned long)fpregs[3].phys_addr));
 318         fhc->fhc_regs.uregs = ((((unsigned long)fpregs[4].which_io)<<32UL) |
 319                                ((unsigned long)fpregs[4].phys_addr));
 320         fhc->fhc_regs.tregs = ((((unsigned long)fpregs[5].which_io)<<32UL) |
 321                                ((unsigned long)fpregs[5].phys_addr));
 322
 323         /* Obtain board number from board status register, Central's
 324          * FHC lacks "board#" property.
 325          */
 326         err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_BSR);
 327         fhc->board = (((err >> 16) & 0x01) |
 328                       ((err >> 12) & 0x0e));
 329
 330         fhc->jtag_master = 0;
 331
 332         /* Attach the clock board registers for CENTRAL. */
 333         probe_clock_board(central_bus, fhc, cnode, fnode);
 334
 335         err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);
 336         printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] (CENTRAL)\n",
 337                fhc->board,
 338                ((err & FHC_ID_VERS) >> 28),
 339                ((err & FHC_ID_PARTID) >> 12),
 340                ((err & FHC_ID_MANUF) >> 1));
 341
 342         probe_other_fhcs();
 343 }
 344
 345 static __inline__ void fhc_ledblink(struct linux_fhc *fhc, int on)
 346 {
 347         u32 tmp;
 348
 349         tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 350
 351         /* NOTE: reverse logic on this bit */
 352         if (on)
 353                 tmp &= ~(FHC_CONTROL_RLED);
 354         else
 355                 tmp |= FHC_CONTROL_RLED;
 356         tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF | FHC_CONTROL_SLINE);
 357
 358         upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 359         upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 360 }
 361
 362 static __inline__ void central_ledblink(struct linux_central *central, int on)
 363 {
 364         u8 tmp;
 365
 366         tmp = upa_readb(central->clkregs + CLOCK_CTRL);
 367
 368         /* NOTE: reverse logic on this bit */
 369         if(on)
 370                 tmp &= ~(CLOCK_CTRL_RLED);
 371         else
 372                 tmp |= CLOCK_CTRL_RLED;
 373
 374         upa_writeb(tmp, central->clkregs + CLOCK_CTRL);
 375         upa_readb(central->clkregs + CLOCK_CTRL);
 376 }
 377
 378 static struct timer_list sftimer;
 379 static int led_state;
 380
 381 static void sunfire_timer(unsigned long __ignored)
 382 {
 383         struct linux_fhc *fhc;
 384
 385         central_ledblink(central_bus, led_state);
 386         for(fhc = fhc_list; fhc != NULL; fhc = fhc->next)
 387                 if(! IS_CENTRAL_FHC(fhc))
 388                         fhc_ledblink(fhc, led_state);
 389         led_state = ! led_state;
 390         sftimer.expires = jiffies + (HZ >> 1);
 391         add_timer(&sftimer);
 392 }
 393
 394 /* After PCI/SBUS busses have been probed, this is called to perform
 395  * final initialization of all FireHose Controllers in the system.
 396  */
 397 void firetruck_init(void)
 398 {
 399         struct linux_central *central = central_bus;
 400         struct linux_fhc *fhc;
 401         u8 ctrl;
 402
 403         /* No central bus, nothing to do. */
 404         if (central == NULL)
 405                 return;
 406
 407         for(fhc = fhc_list; fhc != NULL; fhc = fhc->next) {
 408                 u32 tmp;
 409
 410                 /* Clear all of the interrupt mapping registers
 411                  * just in case OBP left them in a foul state.
 412                  */
 413 #define ZAP(ICLR, IMAP) \
 414 do {    u32 imap_tmp; \
 415         upa_writel(0, (ICLR)); \
 416         upa_readl(ICLR); \
 417         imap_tmp = upa_readl(IMAP); \
 418         imap_tmp &= ~(0x80000000); \
 419         upa_writel(imap_tmp, (IMAP)); \
 420         upa_readl(IMAP); \
 421 } while (0)
 422
 423                 ZAP(fhc->fhc_regs.ffregs + FHC_FFREGS_ICLR,
 424                     fhc->fhc_regs.ffregs + FHC_FFREGS_IMAP);
 425                 ZAP(fhc->fhc_regs.sregs + FHC_SREGS_ICLR,
 426                     fhc->fhc_regs.sregs + FHC_SREGS_IMAP);
 427                 ZAP(fhc->fhc_regs.uregs + FHC_UREGS_ICLR,
 428                     fhc->fhc_regs.uregs + FHC_UREGS_IMAP);
 429                 ZAP(fhc->fhc_regs.tregs + FHC_TREGS_ICLR,
 430                     fhc->fhc_regs.tregs + FHC_TREGS_IMAP);
 431
 432 #undef ZAP
 433
 434                 /* Setup FHC control register. */
 435                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 436
 437                 /* All non-central boards have this bit set. */
 438                 if(! IS_CENTRAL_FHC(fhc))
 439                         tmp |= FHC_CONTROL_IXIST;
 440
 441                 /* For all FHCs, clear the firmware synchronization
 442                  * line and both low power mode enables.
 443                  */
 444                 tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF | FHC_CONTROL_SLINE);
 445
 446                 upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 447                 upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 448         }
 449
 450         /* OBP leaves it on, turn it off so clock board timer LED
 451          * is in sync with FHC ones.
 452          */
 453         ctrl = upa_readb(central->clkregs + CLOCK_CTRL);
 454         ctrl &= ~(CLOCK_CTRL_RLED);
 455         upa_writeb(ctrl, central->clkregs + CLOCK_CTRL);
 456
 457         led_state = 0;
 458         init_timer(&sftimer);
 459         sftimer.data = 0;
 460         sftimer.function = &sunfire_timer;
 461         sftimer.expires = jiffies + (HZ >> 1);
 462         add_timer(&sftimer);
 463 }