arch/sparc64/kernel/central.c

   1 /* $Id: central.c,v 1.15 2001/12/19 00:29:51 davem 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 void central_probe_failure(int line)
  26 {
  27         prom_printf("CENTRAL: Critical device probe failure at central.c:%d\n",
  28                     line);
  29         prom_halt();
  30 }
  31
  32 static void central_ranges_init(struct linux_central *central)
  33 {
  34         struct device_node *dp = central->prom_node;
  35         void *pval;
  36         int len;
  37
  38         central->num_central_ranges = 0;
  39         pval = of_get_property(dp, "ranges", &len);
  40         if (pval) {
  41                 memcpy(central->central_ranges, pval, len);
  42                 central->num_central_ranges =
  43                         (len / sizeof(struct linux_prom_ranges));
  44         }
  45 }
  46
  47 static void fhc_ranges_init(struct linux_fhc *fhc)
  48 {
  49         struct device_node *dp = fhc->prom_node;
  50         void *pval;
  51         int len;
  52
  53         fhc->num_fhc_ranges = 0;
  54         pval = of_get_property(dp, "ranges", &len);
  55         if (pval) {
  56                 memcpy(fhc->fhc_ranges, pval, len);
  57                 fhc->num_fhc_ranges =
  58                         (len / sizeof(struct linux_prom_ranges));
  59         }
  60 }
  61
  62 /* Range application routines are exported to various drivers,
  63  * so do not __init this.
  64  */
  65 static void adjust_regs(struct linux_prom_registers *regp, int nregs,
  66                         struct linux_prom_ranges *rangep, int nranges)
  67 {
  68         int regc, rngc;
  69
  70         for (regc = 0; regc < nregs; regc++) {
  71                 for (rngc = 0; rngc < nranges; rngc++)
  72                         if (regp[regc].which_io == rangep[rngc].ot_child_space)
  73                                 break; /* Fount it */
  74                 if (rngc == nranges) /* oops */
  75                         central_probe_failure(__LINE__);
  76                 regp[regc].which_io = rangep[rngc].ot_parent_space;
  77                 regp[regc].phys_addr -= rangep[rngc].ot_child_base;
  78                 regp[regc].phys_addr += rangep[rngc].ot_parent_base;
  79         }
  80 }
  81
  82 /* Apply probed fhc ranges to registers passed, if no ranges return. */
  83 void apply_fhc_ranges(struct linux_fhc *fhc,
  84                       struct linux_prom_registers *regs,
  85                       int nregs)
  86 {
  87         if (fhc->num_fhc_ranges)
  88                 adjust_regs(regs, nregs, fhc->fhc_ranges,
  89                             fhc->num_fhc_ranges);
  90 }
  91
  92 /* Apply probed central ranges to registers passed, if no ranges return. */
  93 void apply_central_ranges(struct linux_central *central,
  94                           struct linux_prom_registers *regs, int nregs)
  95 {
  96         if (central->num_central_ranges)
  97                 adjust_regs(regs, nregs, central->central_ranges,
  98                             central->num_central_ranges);
  99 }
 100
 101 void * __init central_alloc_bootmem(unsigned long size)
 102 {
 103         void *ret;
 104
 105         ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
 106         if (ret != NULL)
 107                 memset(ret, 0, size);
 108
 109         return ret;
 110 }
 111
 112 static unsigned long prom_reg_to_paddr(struct linux_prom_registers *r)
 113 {
 114         unsigned long ret = ((unsigned long) r->which_io) << 32;
 115
 116         return ret | (unsigned long) r->phys_addr;
 117 }
 118
 119 static void probe_other_fhcs(void)
 120 {
 121         struct device_node *dp;
 122         struct linux_prom64_registers *fpregs;
 123
 124         for_each_node_by_name(dp, "fhc") {
 125                 struct linux_fhc *fhc;
 126                 int board;
 127                 u32 tmp;
 128
 129                 if (dp->parent &&
 130                     dp->parent->parent != NULL)
 131                         continue;
 132
 133                 fhc = (struct linux_fhc *)
 134                         central_alloc_bootmem(sizeof(struct linux_fhc));
 135                 if (fhc == NULL)
 136                         central_probe_failure(__LINE__);
 137
 138                 /* Link it into the FHC chain. */
 139                 fhc->next = fhc_list;
 140                 fhc_list = fhc;
 141
 142                 /* Toplevel FHCs have no parent. */
 143                 fhc->parent = NULL;
 144
 145                 fhc->prom_node = dp;
 146                 fhc_ranges_init(fhc);
 147
 148                 /* Non-central FHC's have 64-bit OBP format registers. */
 149                 fpregs = of_get_property(dp, "reg", NULL);
 150                 if (!fpregs)
 151                         central_probe_failure(__LINE__);
 152
 153                 /* Only central FHC needs special ranges applied. */
 154                 fhc->fhc_regs.pregs = fpregs[0].phys_addr;
 155                 fhc->fhc_regs.ireg = fpregs[1].phys_addr;
 156                 fhc->fhc_regs.ffregs = fpregs[2].phys_addr;
 157                 fhc->fhc_regs.sregs = fpregs[3].phys_addr;
 158                 fhc->fhc_regs.uregs = fpregs[4].phys_addr;
 159                 fhc->fhc_regs.tregs = fpregs[5].phys_addr;
 160
 161                 board = of_getintprop_default(dp, "board#", -1);
 162                 fhc->board = board;
 163
 164                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_JCTRL);
 165                 if ((tmp & FHC_JTAG_CTRL_MENAB) != 0)
 166                         fhc->jtag_master = 1;
 167                 else
 168                         fhc->jtag_master = 0;
 169
 170                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);
 171                 printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] %s\n",
 172                        board,
 173                        (tmp & FHC_ID_VERS) >> 28,
 174                        (tmp & FHC_ID_PARTID) >> 12,
 175                        (tmp & FHC_ID_MANUF) >> 1,
 176                        (fhc->jtag_master ? "(JTAG Master)" : ""));
 177
 178                 /* This bit must be set in all non-central FHC's in
 179                  * the system.  When it is clear, this identifies
 180                  * the central board.
 181                  */
 182                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 183                 tmp |= FHC_CONTROL_IXIST;
 184                 upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 185         }
 186 }
 187
 188 static void probe_clock_board(struct linux_central *central,
 189                               struct linux_fhc *fhc,
 190                               struct device_node *fp)
 191 {
 192         struct device_node *dp;
 193         struct linux_prom_registers cregs[3], *pr;
 194         int nslots, tmp, nregs;
 195
 196         dp = fp->child;
 197         while (dp) {
 198                 if (!strcmp(dp->name, "clock-board"))
 199                         break;
 200                 dp = dp->sibling;
 201         }
 202         if (!dp)
 203                 central_probe_failure(__LINE__);
 204
 205         pr = of_get_property(dp, "reg", &nregs);
 206         if (!pr)
 207                 central_probe_failure(__LINE__);
 208
 209         memcpy(cregs, pr, nregs);
 210         nregs /= sizeof(struct linux_prom_registers);
 211
 212         apply_fhc_ranges(fhc, &cregs[0], nregs);
 213         apply_central_ranges(central, &cregs[0], nregs);
 214         central->cfreg = prom_reg_to_paddr(&cregs[0]);
 215         central->clkregs = prom_reg_to_paddr(&cregs[1]);
 216
 217         if (nregs == 2)
 218                 central->clkver = 0UL;
 219         else
 220                 central->clkver = prom_reg_to_paddr(&cregs[2]);
 221
 222         tmp = upa_readb(central->clkregs + CLOCK_STAT1);
 223         tmp &= 0xc0;
 224         switch(tmp) {
 225         case 0x40:
 226                 nslots = 16;
 227                 break;
 228         case 0xc0:
 229                 nslots = 8;
 230                 break;
 231         case 0x80:
 232                 if (central->clkver != 0UL &&
 233                    upa_readb(central->clkver) != 0) {
 234                         if ((upa_readb(central->clkver) & 0x80) != 0)
 235                                 nslots = 4;
 236                         else
 237                                 nslots = 5;
 238                         break;
 239                 }
 240         default:
 241                 nslots = 4;
 242                 break;
 243         };
 244         central->slots = nslots;
 245         printk("CENTRAL: Detected %d slot Enterprise system. cfreg[%02x] cver[%02x]\n",
 246                central->slots, upa_readb(central->cfreg),
 247                (central->clkver ? upa_readb(central->clkver) : 0x00));
 248 }
 249
 250 static void ZAP(unsigned long iclr, unsigned long imap)
 251 {
 252         u32 imap_tmp;
 253
 254         upa_writel(0, iclr);
 255         upa_readl(iclr);
 256         imap_tmp = upa_readl(imap);
 257         imap_tmp &= ~(0x80000000);
 258         upa_writel(imap_tmp, imap);
 259         upa_readl(imap);
 260 }
 261
 262 static void init_all_fhc_hw(void)
 263 {
 264         struct linux_fhc *fhc;
 265
 266         for (fhc = fhc_list; fhc != NULL; fhc = fhc->next) {
 267                 u32 tmp;
 268
 269                 /* Clear all of the interrupt mapping registers
 270                  * just in case OBP left them in a foul state.
 271                  */
 272                 ZAP(fhc->fhc_regs.ffregs + FHC_FFREGS_ICLR,
 273                     fhc->fhc_regs.ffregs + FHC_FFREGS_IMAP);
 274                 ZAP(fhc->fhc_regs.sregs + FHC_SREGS_ICLR,
 275                     fhc->fhc_regs.sregs + FHC_SREGS_IMAP);
 276                 ZAP(fhc->fhc_regs.uregs + FHC_UREGS_ICLR,
 277                     fhc->fhc_regs.uregs + FHC_UREGS_IMAP);
 278                 ZAP(fhc->fhc_regs.tregs + FHC_TREGS_ICLR,
 279                     fhc->fhc_regs.tregs + FHC_TREGS_IMAP);
 280
 281                 /* Setup FHC control register. */
 282                 tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 283
 284                 /* All non-central boards have this bit set. */
 285                 if (! IS_CENTRAL_FHC(fhc))
 286                         tmp |= FHC_CONTROL_IXIST;
 287
 288                 /* For all FHCs, clear the firmware synchronization
 289                  * line and both low power mode enables.
 290                  */
 291                 tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF |
 292                          FHC_CONTROL_SLINE);
 293
 294                 upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 295                 upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 296         }
 297
 298 }
 299
 300 void central_probe(void)
 301 {
 302         struct linux_prom_registers fpregs[6], *pr;
 303         struct linux_fhc *fhc;
 304         struct device_node *dp, *fp;
 305         int err;
 306
 307         dp = of_find_node_by_name(NULL, "central");
 308         if (!dp) {
 309                 if (this_is_starfire)
 310                         starfire_cpu_setup();
 311                 return;
 312         }
 313
 314         /* Ok we got one, grab some memory for software state. */
 315         central_bus = (struct linux_central *)
 316                 central_alloc_bootmem(sizeof(struct linux_central));
 317         if (central_bus == NULL)
 318                 central_probe_failure(__LINE__);
 319
 320         fhc = (struct linux_fhc *)
 321                 central_alloc_bootmem(sizeof(struct linux_fhc));
 322         if (fhc == NULL)
 323                 central_probe_failure(__LINE__);
 324
 325         /* First init central. */
 326         central_bus->child = fhc;
 327         central_bus->prom_node = dp;
 328         central_ranges_init(central_bus);
 329
 330         /* And then central's FHC. */
 331         fhc->next = fhc_list;
 332         fhc_list = fhc;
 333
 334         fhc->parent = central_bus;
 335         fp = dp->child;
 336         while (fp) {
 337                 if (!strcmp(fp->name, "fhc"))
 338                         break;
 339                 fp = fp->sibling;
 340         }
 341         if (!fp)
 342                 central_probe_failure(__LINE__);
 343
 344         fhc->prom_node = fp;
 345         fhc_ranges_init(fhc);
 346
 347         /* Now, map in FHC register set. */
 348         pr = of_get_property(fp, "reg", NULL);
 349         if (!pr)
 350                 central_probe_failure(__LINE__);
 351         memcpy(fpregs, pr, sizeof(fpregs));
 352
 353         apply_central_ranges(central_bus, &fpregs[0], 6);
 354
 355         fhc->fhc_regs.pregs = prom_reg_to_paddr(&fpregs[0]);
 356         fhc->fhc_regs.ireg = prom_reg_to_paddr(&fpregs[1]);
 357         fhc->fhc_regs.ffregs = prom_reg_to_paddr(&fpregs[2]);
 358         fhc->fhc_regs.sregs = prom_reg_to_paddr(&fpregs[3]);
 359         fhc->fhc_regs.uregs = prom_reg_to_paddr(&fpregs[4]);
 360         fhc->fhc_regs.tregs = prom_reg_to_paddr(&fpregs[5]);
 361
 362         /* Obtain board number from board status register, Central's
 363          * FHC lacks "board#" property.
 364          */
 365         err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_BSR);
 366         fhc->board = (((err >> 16) & 0x01) |
 367                       ((err >> 12) & 0x0e));
 368
 369         fhc->jtag_master = 0;
 370
 371         /* Attach the clock board registers for CENTRAL. */
 372         probe_clock_board(central_bus, fhc, fp);
 373
 374         err = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_ID);
 375         printk("FHC(board %d): Version[%x] PartID[%x] Manuf[%x] (CENTRAL)\n",
 376                fhc->board,
 377                ((err & FHC_ID_VERS) >> 28),
 378                ((err & FHC_ID_PARTID) >> 12),
 379                ((err & FHC_ID_MANUF) >> 1));
 380
 381         probe_other_fhcs();
 382
 383         init_all_fhc_hw();
 384 }
 385
 386 static __inline__ void fhc_ledblink(struct linux_fhc *fhc, int on)
 387 {
 388         u32 tmp;
 389
 390         tmp = upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 391
 392         /* NOTE: reverse logic on this bit */
 393         if (on)
 394                 tmp &= ~(FHC_CONTROL_RLED);
 395         else
 396                 tmp |= FHC_CONTROL_RLED;
 397         tmp &= ~(FHC_CONTROL_AOFF | FHC_CONTROL_BOFF | FHC_CONTROL_SLINE);
 398
 399         upa_writel(tmp, fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 400         upa_readl(fhc->fhc_regs.pregs + FHC_PREGS_CTRL);
 401 }
 402
 403 static __inline__ void central_ledblink(struct linux_central *central, int on)
 404 {
 405         u8 tmp;
 406
 407         tmp = upa_readb(central->clkregs + CLOCK_CTRL);
 408
 409         /* NOTE: reverse logic on this bit */
 410         if (on)
 411                 tmp &= ~(CLOCK_CTRL_RLED);
 412         else
 413                 tmp |= CLOCK_CTRL_RLED;
 414
 415         upa_writeb(tmp, central->clkregs + CLOCK_CTRL);
 416         upa_readb(central->clkregs + CLOCK_CTRL);
 417 }
 418
 419 static struct timer_list sftimer;
 420 static int led_state;
 421
 422 static void sunfire_timer(unsigned long __ignored)
 423 {
 424         struct linux_fhc *fhc;
 425
 426         central_ledblink(central_bus, led_state);
 427         for (fhc = fhc_list; fhc != NULL; fhc = fhc->next)
 428                 if (! IS_CENTRAL_FHC(fhc))
 429                         fhc_ledblink(fhc, led_state);
 430         led_state = ! led_state;
 431         sftimer.expires = jiffies + (HZ >> 1);
 432         add_timer(&sftimer);
 433 }
 434
 435 /* After PCI/SBUS busses have been probed, this is called to perform
 436  * final initialization of all FireHose Controllers in the system.
 437  */
 438 void firetruck_init(void)
 439 {
 440         struct linux_central *central = central_bus;
 441         u8 ctrl;
 442
 443         /* No central bus, nothing to do. */
 444         if (central == NULL)
 445                 return;
 446
 447         /* OBP leaves it on, turn it off so clock board timer LED
 448          * is in sync with FHC ones.
 449          */
 450         ctrl = upa_readb(central->clkregs + CLOCK_CTRL);
 451         ctrl &= ~(CLOCK_CTRL_RLED);
 452         upa_writeb(ctrl, central->clkregs + CLOCK_CTRL);
 453
 454         led_state = 0;
 455         init_timer(&sftimer);
 456         sftimer.data = 0;
 457         sftimer.function = &sunfire_timer;
 458         sftimer.expires = jiffies + (HZ >> 1);
 459         add_timer(&sftimer);
 460 }