arch/ppc/platforms/pmac_smp.c

   1 /*
   2  * SMP support for power macintosh.
   3  *
   4  * We support both the old "powersurge" SMP architecture
   5  * and the current Core99 (G4 PowerMac) machines.
   6  *
   7  * Note that we don't support the very first rev. of
   8  * Apple/DayStar 2 CPUs board, the one with the funky
   9  * watchdog. Hopefully, none of these should be there except
  10  * maybe internally to Apple. I should probably still add some
  11  * code to detect this card though and disable SMP. --BenH.
  12  *
  13  * Support Macintosh G4 SMP by Troy Benjegerdes (hozer@drgw.net)
  14  * and Ben Herrenschmidt <benh@kernel.crashing.org>.
  15  *
  16  * Support for DayStar quad CPU cards
  17  * Copyright (C) XLR8, Inc. 1994-2000
  18  *
  19  *  This program is free software; you can redistribute it and/or
  20  *  modify it under the terms of the GNU General Public License
  21  *  as published by the Free Software Foundation; either version
  22  *  2 of the License, or (at your option) any later version.
  23  */
  24 #include <linux/config.h>
  25 #include <linux/kernel.h>
  26 #include <linux/sched.h>
  27 #include <linux/smp.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/kernel_stat.h>
  31 #include <linux/delay.h>
  32 #include <linux/init.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/errno.h>
  35 #include <linux/hardirq.h>
  36 #include <linux/cpu.h>
  37
  38 #include <asm/ptrace.h>
  39 #include <asm/atomic.h>
  40 #include <asm/irq.h>
  41 #include <asm/page.h>
  42 #include <asm/pgtable.h>
  43 #include <asm/sections.h>
  44 #include <asm/io.h>
  45 #include <asm/prom.h>
  46 #include <asm/smp.h>
  47 #include <asm/residual.h>
  48 #include <asm/machdep.h>
  49 #include <asm/pmac_feature.h>
  50 #include <asm/time.h>
  51 #include <asm/open_pic.h>
  52 #include <asm/cacheflush.h>
  53 #include <asm/keylargo.h>
  54
  55 /*
  56  * Powersurge (old powermac SMP) support.
  57  */
  58
  59 extern void __secondary_start_pmac_0(void);
  60
  61 /* Addresses for powersurge registers */
  62 #define HAMMERHEAD_BASE         0xf8000000
  63 #define HHEAD_CONFIG            0x90
  64 #define HHEAD_SEC_INTR          0xc0
  65
  66 /* register for interrupting the primary processor on the powersurge */
  67 /* N.B. this is actually the ethernet ROM! */
  68 #define PSURGE_PRI_INTR         0xf3019000
  69
  70 /* register for storing the start address for the secondary processor */
  71 /* N.B. this is the PCI config space address register for the 1st bridge */
  72 #define PSURGE_START            0xf2800000
  73
  74 /* Daystar/XLR8 4-CPU card */
  75 #define PSURGE_QUAD_REG_ADDR    0xf8800000
  76
  77 #define PSURGE_QUAD_IRQ_SET     0
  78 #define PSURGE_QUAD_IRQ_CLR     1
  79 #define PSURGE_QUAD_IRQ_PRIMARY 2
  80 #define PSURGE_QUAD_CKSTOP_CTL  3
  81 #define PSURGE_QUAD_PRIMARY_ARB 4
  82 #define PSURGE_QUAD_BOARD_ID    6
  83 #define PSURGE_QUAD_WHICH_CPU   7
  84 #define PSURGE_QUAD_CKSTOP_RDBK 8
  85 #define PSURGE_QUAD_RESET_CTL   11
  86
  87 #define PSURGE_QUAD_OUT(r, v)   (out_8(quad_base + ((r) << 4) + 4, (v)))
  88 #define PSURGE_QUAD_IN(r)       (in_8(quad_base + ((r) << 4) + 4) & 0x0f)
  89 #define PSURGE_QUAD_BIS(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) | (v)))
  90 #define PSURGE_QUAD_BIC(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) & ~(v)))
  91
  92 /* virtual addresses for the above */
  93 static volatile u8 __iomem *hhead_base;
  94 static volatile u8 __iomem *quad_base;
  95 static volatile u32 __iomem *psurge_pri_intr;
  96 static volatile u8 __iomem *psurge_sec_intr;
  97 static volatile u32 __iomem *psurge_start;
  98
  99 /* values for psurge_type */
 100 #define PSURGE_NONE             -1
 101 #define PSURGE_DUAL             0
 102 #define PSURGE_QUAD_OKEE        1
 103 #define PSURGE_QUAD_COTTON      2
 104 #define PSURGE_QUAD_ICEGRASS    3
 105
 106 /* what sort of powersurge board we have */
 107 static int psurge_type = PSURGE_NONE;
 108
 109 /* L2 and L3 cache settings to pass from CPU0 to CPU1 */
 110 volatile static long int core99_l2_cache;
 111 volatile static long int core99_l3_cache;
 112
 113 /* Timebase freeze GPIO */
 114 static unsigned int core99_tb_gpio;
 115
 116 /* Sync flag for HW tb sync */
 117 static volatile int sec_tb_reset = 0;
 118 static unsigned int pri_tb_hi, pri_tb_lo;
 119 static unsigned int pri_tb_stamp;
 120
 121 static void __devinit core99_init_caches(int cpu)
 122 {
 123         if (!cpu_has_feature(CPU_FTR_L2CR))
 124                 return;
 125
 126         if (cpu == 0) {
 127                 core99_l2_cache = _get_L2CR();
 128                 printk("CPU0: L2CR is %lx\n", core99_l2_cache);
 129         } else {
 130                 printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
 131                 _set_L2CR(0);
 132                 _set_L2CR(core99_l2_cache);
 133                 printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
 134         }
 135
 136         if (!cpu_has_feature(CPU_FTR_L3CR))
 137                 return;
 138
 139         if (cpu == 0){
 140                 core99_l3_cache = _get_L3CR();
 141                 printk("CPU0: L3CR is %lx\n", core99_l3_cache);
 142         } else {
 143                 printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
 144                 _set_L3CR(0);
 145                 _set_L3CR(core99_l3_cache);
 146                 printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
 147         }
 148 }
 149
 150 /*
 151  * Set and clear IPIs for powersurge.
 152  */
 153 static inline void psurge_set_ipi(int cpu)
 154 {
 155         if (psurge_type == PSURGE_NONE)
 156                 return;
 157         if (cpu == 0)
 158                 in_be32(psurge_pri_intr);
 159         else if (psurge_type == PSURGE_DUAL)
 160                 out_8(psurge_sec_intr, 0);
 161         else
 162                 PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_SET, 1 << cpu);
 163 }
 164
 165 static inline void psurge_clr_ipi(int cpu)
 166 {
 167         if (cpu > 0) {
 168                 switch(psurge_type) {
 169                 case PSURGE_DUAL:
 170                         out_8(psurge_sec_intr, ~0);
 171                 case PSURGE_NONE:
 172                         break;
 173                 default:
 174                         PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, 1 << cpu);
 175                 }
 176         }
 177 }
 178
 179 /*
 180  * On powersurge (old SMP powermac architecture) we don't have
 181  * separate IPIs for separate messages like openpic does.  Instead
 182  * we have a bitmap for each processor, where a 1 bit means that
 183  * the corresponding message is pending for that processor.
 184  * Ideally each cpu's entry would be in a different cache line.
 185  *  -- paulus.
 186  */
 187 static unsigned long psurge_smp_message[NR_CPUS];
 188
 189 void __pmac psurge_smp_message_recv(struct pt_regs *regs)
 190 {
 191         int cpu = smp_processor_id();
 192         int msg;
 193
 194         /* clear interrupt */
 195         psurge_clr_ipi(cpu);
 196
 197         if (num_online_cpus() < 2)
 198                 return;
 199
 200         /* make sure there is a message there */
 201         for (msg = 0; msg < 4; msg++)
 202                 if (test_and_clear_bit(msg, &psurge_smp_message[cpu]))
 203                         smp_message_recv(msg, regs);
 204 }
 205
 206 irqreturn_t __pmac psurge_primary_intr(int irq, void *d, struct pt_regs *regs)
 207 {
 208         psurge_smp_message_recv(regs);
 209         return IRQ_HANDLED;
 210 }
 211
 212 static void __pmac smp_psurge_message_pass(int target, int msg, unsigned long data,
 213                                            int wait)
 214 {
 215         int i;
 216
 217         if (num_online_cpus() < 2)
 218                 return;
 219
 220         for (i = 0; i < NR_CPUS; i++) {
 221                 if (!cpu_online(i))
 222                         continue;
 223                 if (target == MSG_ALL
 224                     || (target == MSG_ALL_BUT_SELF && i != smp_processor_id())
 225                     || target == i) {
 226                         set_bit(msg, &psurge_smp_message[i]);
 227                         psurge_set_ipi(i);
 228                 }
 229         }
 230 }
 231
 232 /*
 233  * Determine a quad card presence. We read the board ID register, we
 234  * force the data bus to change to something else, and we read it again.
 235  * It it's stable, then the register probably exist (ugh !)
 236  */
 237 static int __init psurge_quad_probe(void)
 238 {
 239         int type;
 240         unsigned int i;
 241
 242         type = PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID);
 243         if (type < PSURGE_QUAD_OKEE || type > PSURGE_QUAD_ICEGRASS
 244             || type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID))
 245                 return PSURGE_DUAL;
 246
 247         /* looks OK, try a slightly more rigorous test */
 248         /* bogus is not necessarily cacheline-aligned,
 249            though I don't suppose that really matters.  -- paulus */
 250         for (i = 0; i < 100; i++) {
 251                 volatile u32 bogus[8];
 252                 bogus[(0+i)%8] = 0x00000000;
 253                 bogus[(1+i)%8] = 0x55555555;
 254                 bogus[(2+i)%8] = 0xFFFFFFFF;
 255                 bogus[(3+i)%8] = 0xAAAAAAAA;
 256                 bogus[(4+i)%8] = 0x33333333;
 257                 bogus[(5+i)%8] = 0xCCCCCCCC;
 258                 bogus[(6+i)%8] = 0xCCCCCCCC;
 259                 bogus[(7+i)%8] = 0x33333333;
 260                 wmb();
 261                 asm volatile("dcbf 0,%0" : : "r" (bogus) : "memory");
 262                 mb();
 263                 if (type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID))
 264                         return PSURGE_DUAL;
 265         }
 266         return type;
 267 }
 268
 269 static void __init psurge_quad_init(void)
 270 {
 271         int procbits;
 272
 273         if (ppc_md.progress) ppc_md.progress("psurge_quad_init", 0x351);
 274         procbits = ~PSURGE_QUAD_IN(PSURGE_QUAD_WHICH_CPU);
 275         if (psurge_type == PSURGE_QUAD_ICEGRASS)
 276                 PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits);
 277         else
 278                 PSURGE_QUAD_BIC(PSURGE_QUAD_CKSTOP_CTL, procbits);
 279         mdelay(33);
 280         out_8(psurge_sec_intr, ~0);
 281         PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, procbits);
 282         PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits);
 283         if (psurge_type != PSURGE_QUAD_ICEGRASS)
 284                 PSURGE_QUAD_BIS(PSURGE_QUAD_CKSTOP_CTL, procbits);
 285         PSURGE_QUAD_BIC(PSURGE_QUAD_PRIMARY_ARB, procbits);
 286         mdelay(33);
 287         PSURGE_QUAD_BIC(PSURGE_QUAD_RESET_CTL, procbits);
 288         mdelay(33);
 289         PSURGE_QUAD_BIS(PSURGE_QUAD_PRIMARY_ARB, procbits);
 290         mdelay(33);
 291 }
 292
 293 static int __init smp_psurge_probe(void)
 294 {
 295         int i, ncpus;
 296
 297         /* We don't do SMP on the PPC601 -- paulus */
 298         if (PVR_VER(mfspr(SPRN_PVR)) == 1)
 299                 return 1;
 300
 301         /*
 302          * The powersurge cpu board can be used in the generation
 303          * of powermacs that have a socket for an upgradeable cpu card,
 304          * including the 7500, 8500, 9500, 9600.
 305          * The device tree doesn't tell you if you have 2 cpus because
 306          * OF doesn't know anything about the 2nd processor.
 307          * Instead we look for magic bits in magic registers,
 308          * in the hammerhead memory controller in the case of the
 309          * dual-cpu powersurge board.  -- paulus.
 310          */
 311         if (find_devices("hammerhead") == NULL)
 312                 return 1;
 313
 314         hhead_base = ioremap(HAMMERHEAD_BASE, 0x800);
 315         quad_base = ioremap(PSURGE_QUAD_REG_ADDR, 1024);
 316         psurge_sec_intr = hhead_base + HHEAD_SEC_INTR;
 317
 318         psurge_type = psurge_quad_probe();
 319         if (psurge_type != PSURGE_DUAL) {
 320                 psurge_quad_init();
 321                 /* All released cards using this HW design have 4 CPUs */
 322                 ncpus = 4;
 323         } else {
 324                 iounmap(quad_base);
 325                 if ((in_8(hhead_base + HHEAD_CONFIG) & 0x02) == 0) {
 326                         /* not a dual-cpu card */
 327                         iounmap(hhead_base);
 328                         psurge_type = PSURGE_NONE;
 329                         return 1;
 330                 }
 331                 ncpus = 2;
 332         }
 333
 334         psurge_start = ioremap(PSURGE_START, 4);
 335         psurge_pri_intr = ioremap(PSURGE_PRI_INTR, 4);
 336
 337         /* this is not actually strictly necessary -- paulus. */
 338         for (i = 1; i < ncpus; ++i)
 339                 smp_hw_index[i] = i;
 340
 341         if (ppc_md.progress) ppc_md.progress("smp_psurge_probe - done", 0x352);
 342
 343         return ncpus;
 344 }
 345
 346 static void __init smp_psurge_kick_cpu(int nr)
 347 {
 348         unsigned long start = __pa(__secondary_start_pmac_0) + nr * 8;
 349         unsigned long a;
 350
 351         /* may need to flush here if secondary bats aren't setup */
 352         for (a = KERNELBASE; a < KERNELBASE + 0x800000; a += 32)
 353                 asm volatile("dcbf 0,%0" : : "r" (a) : "memory");
 354         asm volatile("sync");
 355
 356         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu", 0x353);
 357
 358         out_be32(psurge_start, start);
 359         mb();
 360
 361         psurge_set_ipi(nr);
 362         udelay(10);
 363         psurge_clr_ipi(nr);
 364
 365         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354);
 366 }
 367
 368 /*
 369  * With the dual-cpu powersurge board, the decrementers and timebases
 370  * of both cpus are frozen after the secondary cpu is started up,
 371  * until we give the secondary cpu another interrupt.  This routine
 372  * uses this to get the timebases synchronized.
 373  *  -- paulus.
 374  */
 375 static void __init psurge_dual_sync_tb(int cpu_nr)
 376 {
 377         int t;
 378
 379         set_dec(tb_ticks_per_jiffy);
 380         set_tb(0, 0);
 381         last_jiffy_stamp(cpu_nr) = 0;
 382
 383         if (cpu_nr > 0) {
 384                 mb();
 385                 sec_tb_reset = 1;
 386                 return;
 387         }
 388
 389         /* wait for the secondary to have reset its TB before proceeding */
 390         for (t = 10000000; t > 0 && !sec_tb_reset; --t)
 391                 ;
 392
 393         /* now interrupt the secondary, starting both TBs */
 394         psurge_set_ipi(1);
 395
 396         smp_tb_synchronized = 1;
 397 }
 398
 399 static struct irqaction psurge_irqaction = {
 400         .handler = psurge_primary_intr,
 401         .flags = SA_INTERRUPT,
 402         .mask = CPU_MASK_NONE,
 403         .name = "primary IPI",
 404 };
 405
 406 static void __init smp_psurge_setup_cpu(int cpu_nr)
 407 {
 408
 409         if (cpu_nr == 0) {
 410                 /* If we failed to start the second CPU, we should still
 411                  * send it an IPI to start the timebase & DEC or we might
 412                  * have them stuck.
 413                  */
 414                 if (num_online_cpus() < 2) {
 415                         if (psurge_type == PSURGE_DUAL)
 416                                 psurge_set_ipi(1);
 417                         return;
 418                 }
 419                 /* reset the entry point so if we get another intr we won't
 420                  * try to startup again */
 421                 out_be32(psurge_start, 0x100);
 422                 if (setup_irq(30, &psurge_irqaction))
 423                         printk(KERN_ERR "Couldn't get primary IPI interrupt");
 424         }
 425
 426         if (psurge_type == PSURGE_DUAL)
 427                 psurge_dual_sync_tb(cpu_nr);
 428 }
 429
 430 void __init smp_psurge_take_timebase(void)
 431 {
 432         /* Dummy implementation */
 433 }
 434
 435 void __init smp_psurge_give_timebase(void)
 436 {
 437         /* Dummy implementation */
 438 }
 439
 440 static int __init smp_core99_probe(void)
 441 {
 442 #ifdef CONFIG_6xx
 443         extern int powersave_nap;
 444 #endif
 445         struct device_node *cpus, *firstcpu;
 446         int i, ncpus = 0, boot_cpu = -1;
 447         u32 *tbprop = NULL;
 448
 449         if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
 450         cpus = firstcpu = find_type_devices("cpu");
 451         while(cpus != NULL) {
 452                 u32 *regprop = (u32 *)get_property(cpus, "reg", NULL);
 453                 char *stateprop = (char *)get_property(cpus, "state", NULL);
 454                 if (regprop != NULL && stateprop != NULL &&
 455                     !strncmp(stateprop, "running", 7))
 456                         boot_cpu = *regprop;
 457                 ++ncpus;
 458                 cpus = cpus->next;
 459         }
 460         if (boot_cpu == -1)
 461                 printk(KERN_WARNING "Couldn't detect boot CPU !\n");
 462         if (boot_cpu != 0)
 463                 printk(KERN_WARNING "Boot CPU is %d, unsupported setup !\n", boot_cpu);
 464
 465         if (machine_is_compatible("MacRISC4")) {
 466                 extern struct smp_ops_t core99_smp_ops;
 467
 468                 core99_smp_ops.take_timebase = smp_generic_take_timebase;
 469                 core99_smp_ops.give_timebase = smp_generic_give_timebase;
 470         } else {
 471                 if (firstcpu != NULL)
 472                         tbprop = (u32 *)get_property(firstcpu, "timebase-enable", NULL);
 473                 if (tbprop)
 474                         core99_tb_gpio = *tbprop;
 475                 else
 476                         core99_tb_gpio = KL_GPIO_TB_ENABLE;
 477         }
 478
 479         if (ncpus > 1) {
 480                 openpic_request_IPIs();
 481                 for (i = 1; i < ncpus; ++i)
 482                         smp_hw_index[i] = i;
 483 #ifdef CONFIG_6xx
 484                 powersave_nap = 0;
 485 #endif
 486                 core99_init_caches(0);
 487         }
 488
 489         return ncpus;
 490 }
 491
 492 static void __devinit smp_core99_kick_cpu(int nr)
 493 {
 494         unsigned long save_vector, new_vector;
 495         unsigned long flags;
 496
 497         volatile unsigned long *vector
 498                  = ((volatile unsigned long *)(KERNELBASE+0x100));
 499         if (nr < 0 || nr > 3)
 500                 return;
 501         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu", 0x346);
 502
 503         local_irq_save(flags);
 504         local_irq_disable();
 505
 506         /* Save reset vector */
 507         save_vector = *vector;
 508
 509         /* Setup fake reset vector that does
 510          *   b __secondary_start_pmac_0 + nr*8 - KERNELBASE
 511          */
 512         new_vector = (unsigned long) __secondary_start_pmac_0 + nr * 8;
 513         *vector = 0x48000002 + new_vector - KERNELBASE;
 514
 515         /* flush data cache and inval instruction cache */
 516         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
 517
 518         /* Put some life in our friend */
 519         pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
 520
 521         /* FIXME: We wait a bit for the CPU to take the exception, I should
 522          * instead wait for the entry code to set something for me. Well,
 523          * ideally, all that crap will be done in prom.c and the CPU left
 524          * in a RAM-based wait loop like CHRP.
 525          */
 526         mdelay(1);
 527
 528         /* Restore our exception vector */
 529         *vector = save_vector;
 530         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
 531
 532         local_irq_restore(flags);
 533         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
 534 }
 535
 536 static void __devinit smp_core99_setup_cpu(int cpu_nr)
 537 {
 538         /* Setup L2/L3 */
 539         if (cpu_nr != 0)
 540                 core99_init_caches(cpu_nr);
 541
 542         /* Setup openpic */
 543         do_openpic_setup_cpu();
 544
 545         if (cpu_nr == 0) {
 546 #ifdef CONFIG_POWER4
 547                 extern void g5_phy_disable_cpu1(void);
 548
 549                 /* If we didn't start the second CPU, we must take
 550                  * it off the bus
 551                  */
 552                 if (machine_is_compatible("MacRISC4") &&
 553                     num_online_cpus() < 2)
 554                         g5_phy_disable_cpu1();
 555 #endif /* CONFIG_POWER4 */
 556                 if (ppc_md.progress) ppc_md.progress("core99_setup_cpu 0 done", 0x349);
 557         }
 558 }
 559
 560 /* not __init, called in sleep/wakeup code */
 561 void smp_core99_take_timebase(void)
 562 {
 563         unsigned long flags;
 564
 565         /* tell the primary we're here */
 566         sec_tb_reset = 1;
 567         mb();
 568
 569         /* wait for the primary to set pri_tb_hi/lo */
 570         while (sec_tb_reset < 2)
 571                 mb();
 572
 573         /* set our stuff the same as the primary */
 574         local_irq_save(flags);
 575         set_dec(1);
 576         set_tb(pri_tb_hi, pri_tb_lo);
 577         last_jiffy_stamp(smp_processor_id()) = pri_tb_stamp;
 578         mb();
 579
 580         /* tell the primary we're done */
 581         sec_tb_reset = 0;
 582         mb();
 583         local_irq_restore(flags);
 584 }
 585
 586 /* not __init, called in sleep/wakeup code */
 587 void smp_core99_give_timebase(void)
 588 {
 589         unsigned long flags;
 590         unsigned int t;
 591
 592         /* wait for the secondary to be in take_timebase */
 593         for (t = 100000; t > 0 && !sec_tb_reset; --t)
 594                 udelay(10);
 595         if (!sec_tb_reset) {
 596                 printk(KERN_WARNING "Timeout waiting sync on second CPU\n");
 597                 return;
 598         }
 599
 600         /* freeze the timebase and read it */
 601         /* disable interrupts so the timebase is disabled for the
 602            shortest possible time */
 603         local_irq_save(flags);
 604         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4);
 605         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
 606         mb();
 607         pri_tb_hi = get_tbu();
 608         pri_tb_lo = get_tbl();
 609         pri_tb_stamp = last_jiffy_stamp(smp_processor_id());
 610         mb();
 611
 612         /* tell the secondary we're ready */
 613         sec_tb_reset = 2;
 614         mb();
 615
 616         /* wait for the secondary to have taken it */
 617         for (t = 100000; t > 0 && sec_tb_reset; --t)
 618                 udelay(10);
 619         if (sec_tb_reset)
 620                 printk(KERN_WARNING "Timeout waiting sync(2) on second CPU\n");
 621         else
 622                 smp_tb_synchronized = 1;
 623
 624         /* Now, restart the timebase by leaving the GPIO to an open collector */
 625         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0);
 626         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
 627         local_irq_restore(flags);
 628 }
 629
 630
 631 /* PowerSurge-style Macs */
 632 struct smp_ops_t psurge_smp_ops __pmacdata = {
 633         .message_pass   = smp_psurge_message_pass,
 634         .probe          = smp_psurge_probe,
 635         .kick_cpu       = smp_psurge_kick_cpu,
 636         .setup_cpu      = smp_psurge_setup_cpu,
 637         .give_timebase  = smp_psurge_give_timebase,
 638         .take_timebase  = smp_psurge_take_timebase,
 639 };
 640
 641 /* Core99 Macs (dual G4s) */
 642 struct smp_ops_t core99_smp_ops __pmacdata = {
 643         .message_pass   = smp_openpic_message_pass,
 644         .probe          = smp_core99_probe,
 645         .kick_cpu       = smp_core99_kick_cpu,
 646         .setup_cpu      = smp_core99_setup_cpu,
 647         .give_timebase  = smp_core99_give_timebase,
 648         .take_timebase  = smp_core99_take_timebase,
 649 };
 650
 651 #ifdef CONFIG_HOTPLUG_CPU
 652
 653 int __cpu_disable(void)
 654 {
 655         cpu_clear(smp_processor_id(), cpu_online_map);
 656
 657         /* XXX reset cpu affinity here */
 658         openpic_set_priority(0xf);
 659         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 660         mb();
 661         udelay(20);
 662         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 663         return 0;
 664 }
 665
 666 extern void low_cpu_die(void) __attribute__((noreturn)); /* in pmac_sleep.S */
 667 static int cpu_dead[NR_CPUS];
 668
 669 void cpu_die(void)
 670 {
 671         local_irq_disable();
 672         cpu_dead[smp_processor_id()] = 1;
 673         mb();
 674         low_cpu_die();
 675 }
 676
 677 void __cpu_die(unsigned int cpu)
 678 {
 679         int timeout;
 680
 681         timeout = 1000;
 682         while (!cpu_dead[cpu]) {
 683                 if (--timeout == 0) {
 684                         printk("CPU %u refused to die!\n", cpu);
 685                         break;
 686                 }
 687                 msleep(1);
 688         }
 689         cpu_callin_map[cpu] = 0;
 690         cpu_dead[cpu] = 0;
 691 }
 692
 693 #endif