arch/powerpc/platforms/powermac/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/machdep.h>
  48 #include <asm/pmac_feature.h>
  49 #include <asm/time.h>
  50 #include <asm/mpic.h>
  51 #include <asm/cacheflush.h>
  52 #include <asm/keylargo.h>
  53 #include <asm/pmac_low_i2c.h>
  54
  55 #undef DEBUG
  56
  57 #ifdef DEBUG
  58 #define DBG(fmt...) udbg_printf(fmt)
  59 #else
  60 #define DBG(fmt...)
  61 #endif
  62
  63 extern void __secondary_start_pmac_0(void);
  64
  65 #ifdef CONFIG_PPC32
  66
  67 /* Sync flag for HW tb sync */
  68 static volatile int sec_tb_reset = 0;
  69
  70 /*
  71  * Powersurge (old powermac SMP) support.
  72  */
  73
  74 /* Addresses for powersurge registers */
  75 #define HAMMERHEAD_BASE         0xf8000000
  76 #define HHEAD_CONFIG            0x90
  77 #define HHEAD_SEC_INTR          0xc0
  78
  79 /* register for interrupting the primary processor on the powersurge */
  80 /* N.B. this is actually the ethernet ROM! */
  81 #define PSURGE_PRI_INTR         0xf3019000
  82
  83 /* register for storing the start address for the secondary processor */
  84 /* N.B. this is the PCI config space address register for the 1st bridge */
  85 #define PSURGE_START            0xf2800000
  86
  87 /* Daystar/XLR8 4-CPU card */
  88 #define PSURGE_QUAD_REG_ADDR    0xf8800000
  89
  90 #define PSURGE_QUAD_IRQ_SET     0
  91 #define PSURGE_QUAD_IRQ_CLR     1
  92 #define PSURGE_QUAD_IRQ_PRIMARY 2
  93 #define PSURGE_QUAD_CKSTOP_CTL  3
  94 #define PSURGE_QUAD_PRIMARY_ARB 4
  95 #define PSURGE_QUAD_BOARD_ID    6
  96 #define PSURGE_QUAD_WHICH_CPU   7
  97 #define PSURGE_QUAD_CKSTOP_RDBK 8
  98 #define PSURGE_QUAD_RESET_CTL   11
  99
 100 #define PSURGE_QUAD_OUT(r, v)   (out_8(quad_base + ((r) << 4) + 4, (v)))
 101 #define PSURGE_QUAD_IN(r)       (in_8(quad_base + ((r) << 4) + 4) & 0x0f)
 102 #define PSURGE_QUAD_BIS(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) | (v)))
 103 #define PSURGE_QUAD_BIC(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) & ~(v)))
 104
 105 /* virtual addresses for the above */
 106 static volatile u8 __iomem *hhead_base;
 107 static volatile u8 __iomem *quad_base;
 108 static volatile u32 __iomem *psurge_pri_intr;
 109 static volatile u8 __iomem *psurge_sec_intr;
 110 static volatile u32 __iomem *psurge_start;
 111
 112 /* values for psurge_type */
 113 #define PSURGE_NONE             -1
 114 #define PSURGE_DUAL             0
 115 #define PSURGE_QUAD_OKEE        1
 116 #define PSURGE_QUAD_COTTON      2
 117 #define PSURGE_QUAD_ICEGRASS    3
 118
 119 /* what sort of powersurge board we have */
 120 static int psurge_type = PSURGE_NONE;
 121
 122 /*
 123  * Set and clear IPIs for powersurge.
 124  */
 125 static inline void psurge_set_ipi(int cpu)
 126 {
 127         if (psurge_type == PSURGE_NONE)
 128                 return;
 129         if (cpu == 0)
 130                 in_be32(psurge_pri_intr);
 131         else if (psurge_type == PSURGE_DUAL)
 132                 out_8(psurge_sec_intr, 0);
 133         else
 134                 PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_SET, 1 << cpu);
 135 }
 136
 137 static inline void psurge_clr_ipi(int cpu)
 138 {
 139         if (cpu > 0) {
 140                 switch(psurge_type) {
 141                 case PSURGE_DUAL:
 142                         out_8(psurge_sec_intr, ~0);
 143                 case PSURGE_NONE:
 144                         break;
 145                 default:
 146                         PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, 1 << cpu);
 147                 }
 148         }
 149 }
 150
 151 /*
 152  * On powersurge (old SMP powermac architecture) we don't have
 153  * separate IPIs for separate messages like openpic does.  Instead
 154  * we have a bitmap for each processor, where a 1 bit means that
 155  * the corresponding message is pending for that processor.
 156  * Ideally each cpu's entry would be in a different cache line.
 157  *  -- paulus.
 158  */
 159 static unsigned long psurge_smp_message[NR_CPUS];
 160
 161 void psurge_smp_message_recv(struct pt_regs *regs)
 162 {
 163         int cpu = smp_processor_id();
 164         int msg;
 165
 166         /* clear interrupt */
 167         psurge_clr_ipi(cpu);
 168
 169         if (num_online_cpus() < 2)
 170                 return;
 171
 172         /* make sure there is a message there */
 173         for (msg = 0; msg < 4; msg++)
 174                 if (test_and_clear_bit(msg, &psurge_smp_message[cpu]))
 175                         smp_message_recv(msg, regs);
 176 }
 177
 178 irqreturn_t psurge_primary_intr(int irq, void *d, struct pt_regs *regs)
 179 {
 180         psurge_smp_message_recv(regs);
 181         return IRQ_HANDLED;
 182 }
 183
 184 static void smp_psurge_message_pass(int target, int msg)
 185 {
 186         int i;
 187
 188         if (num_online_cpus() < 2)
 189                 return;
 190
 191         for (i = 0; i < NR_CPUS; i++) {
 192                 if (!cpu_online(i))
 193                         continue;
 194                 if (target == MSG_ALL
 195                     || (target == MSG_ALL_BUT_SELF && i != smp_processor_id())
 196                     || target == i) {
 197                         set_bit(msg, &psurge_smp_message[i]);
 198                         psurge_set_ipi(i);
 199                 }
 200         }
 201 }
 202
 203 /*
 204  * Determine a quad card presence. We read the board ID register, we
 205  * force the data bus to change to something else, and we read it again.
 206  * It it's stable, then the register probably exist (ugh !)
 207  */
 208 static int __init psurge_quad_probe(void)
 209 {
 210         int type;
 211         unsigned int i;
 212
 213         type = PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID);
 214         if (type < PSURGE_QUAD_OKEE || type > PSURGE_QUAD_ICEGRASS
 215             || type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID))
 216                 return PSURGE_DUAL;
 217
 218         /* looks OK, try a slightly more rigorous test */
 219         /* bogus is not necessarily cacheline-aligned,
 220            though I don't suppose that really matters.  -- paulus */
 221         for (i = 0; i < 100; i++) {
 222                 volatile u32 bogus[8];
 223                 bogus[(0+i)%8] = 0x00000000;
 224                 bogus[(1+i)%8] = 0x55555555;
 225                 bogus[(2+i)%8] = 0xFFFFFFFF;
 226                 bogus[(3+i)%8] = 0xAAAAAAAA;
 227                 bogus[(4+i)%8] = 0x33333333;
 228                 bogus[(5+i)%8] = 0xCCCCCCCC;
 229                 bogus[(6+i)%8] = 0xCCCCCCCC;
 230                 bogus[(7+i)%8] = 0x33333333;
 231                 wmb();
 232                 asm volatile("dcbf 0,%0" : : "r" (bogus) : "memory");
 233                 mb();
 234                 if (type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID))
 235                         return PSURGE_DUAL;
 236         }
 237         return type;
 238 }
 239
 240 static void __init psurge_quad_init(void)
 241 {
 242         int procbits;
 243
 244         if (ppc_md.progress) ppc_md.progress("psurge_quad_init", 0x351);
 245         procbits = ~PSURGE_QUAD_IN(PSURGE_QUAD_WHICH_CPU);
 246         if (psurge_type == PSURGE_QUAD_ICEGRASS)
 247                 PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits);
 248         else
 249                 PSURGE_QUAD_BIC(PSURGE_QUAD_CKSTOP_CTL, procbits);
 250         mdelay(33);
 251         out_8(psurge_sec_intr, ~0);
 252         PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, procbits);
 253         PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits);
 254         if (psurge_type != PSURGE_QUAD_ICEGRASS)
 255                 PSURGE_QUAD_BIS(PSURGE_QUAD_CKSTOP_CTL, procbits);
 256         PSURGE_QUAD_BIC(PSURGE_QUAD_PRIMARY_ARB, procbits);
 257         mdelay(33);
 258         PSURGE_QUAD_BIC(PSURGE_QUAD_RESET_CTL, procbits);
 259         mdelay(33);
 260         PSURGE_QUAD_BIS(PSURGE_QUAD_PRIMARY_ARB, procbits);
 261         mdelay(33);
 262 }
 263
 264 static int __init smp_psurge_probe(void)
 265 {
 266         int i, ncpus;
 267
 268         /* We don't do SMP on the PPC601 -- paulus */
 269         if (PVR_VER(mfspr(SPRN_PVR)) == 1)
 270                 return 1;
 271
 272         /*
 273          * The powersurge cpu board can be used in the generation
 274          * of powermacs that have a socket for an upgradeable cpu card,
 275          * including the 7500, 8500, 9500, 9600.
 276          * The device tree doesn't tell you if you have 2 cpus because
 277          * OF doesn't know anything about the 2nd processor.
 278          * Instead we look for magic bits in magic registers,
 279          * in the hammerhead memory controller in the case of the
 280          * dual-cpu powersurge board.  -- paulus.
 281          */
 282         if (find_devices("hammerhead") == NULL)
 283                 return 1;
 284
 285         hhead_base = ioremap(HAMMERHEAD_BASE, 0x800);
 286         quad_base = ioremap(PSURGE_QUAD_REG_ADDR, 1024);
 287         psurge_sec_intr = hhead_base + HHEAD_SEC_INTR;
 288
 289         psurge_type = psurge_quad_probe();
 290         if (psurge_type != PSURGE_DUAL) {
 291                 psurge_quad_init();
 292                 /* All released cards using this HW design have 4 CPUs */
 293                 ncpus = 4;
 294         } else {
 295                 iounmap(quad_base);
 296                 if ((in_8(hhead_base + HHEAD_CONFIG) & 0x02) == 0) {
 297                         /* not a dual-cpu card */
 298                         iounmap(hhead_base);
 299                         psurge_type = PSURGE_NONE;
 300                         return 1;
 301                 }
 302                 ncpus = 2;
 303         }
 304
 305         psurge_start = ioremap(PSURGE_START, 4);
 306         psurge_pri_intr = ioremap(PSURGE_PRI_INTR, 4);
 307
 308         /* this is not actually strictly necessary -- paulus. */
 309         for (i = 1; i < ncpus; ++i)
 310                 smp_hw_index[i] = i;
 311
 312         if (ppc_md.progress) ppc_md.progress("smp_psurge_probe - done", 0x352);
 313
 314         return ncpus;
 315 }
 316
 317 static void __init smp_psurge_kick_cpu(int nr)
 318 {
 319         unsigned long start = __pa(__secondary_start_pmac_0) + nr * 8;
 320         unsigned long a;
 321
 322         /* may need to flush here if secondary bats aren't setup */
 323         for (a = KERNELBASE; a < KERNELBASE + 0x800000; a += 32)
 324                 asm volatile("dcbf 0,%0" : : "r" (a) : "memory");
 325         asm volatile("sync");
 326
 327         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu", 0x353);
 328
 329         out_be32(psurge_start, start);
 330         mb();
 331
 332         psurge_set_ipi(nr);
 333         udelay(10);
 334         psurge_clr_ipi(nr);
 335
 336         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354);
 337 }
 338
 339 /*
 340  * With the dual-cpu powersurge board, the decrementers and timebases
 341  * of both cpus are frozen after the secondary cpu is started up,
 342  * until we give the secondary cpu another interrupt.  This routine
 343  * uses this to get the timebases synchronized.
 344  *  -- paulus.
 345  */
 346 static void __init psurge_dual_sync_tb(int cpu_nr)
 347 {
 348         int t;
 349
 350         set_dec(tb_ticks_per_jiffy);
 351         set_tb(0, 0);
 352         last_jiffy_stamp(cpu_nr) = 0;
 353
 354         if (cpu_nr > 0) {
 355                 mb();
 356                 sec_tb_reset = 1;
 357                 return;
 358         }
 359
 360         /* wait for the secondary to have reset its TB before proceeding */
 361         for (t = 10000000; t > 0 && !sec_tb_reset; --t)
 362                 ;
 363
 364         /* now interrupt the secondary, starting both TBs */
 365         psurge_set_ipi(1);
 366
 367         smp_tb_synchronized = 1;
 368 }
 369
 370 static struct irqaction psurge_irqaction = {
 371         .handler = psurge_primary_intr,
 372         .flags = SA_INTERRUPT,
 373         .mask = CPU_MASK_NONE,
 374         .name = "primary IPI",
 375 };
 376
 377 static void __init smp_psurge_setup_cpu(int cpu_nr)
 378 {
 379
 380         if (cpu_nr == 0) {
 381                 /* If we failed to start the second CPU, we should still
 382                  * send it an IPI to start the timebase & DEC or we might
 383                  * have them stuck.
 384                  */
 385                 if (num_online_cpus() < 2) {
 386                         if (psurge_type == PSURGE_DUAL)
 387                                 psurge_set_ipi(1);
 388                         return;
 389                 }
 390                 /* reset the entry point so if we get another intr we won't
 391                  * try to startup again */
 392                 out_be32(psurge_start, 0x100);
 393                 if (setup_irq(30, &psurge_irqaction))
 394                         printk(KERN_ERR "Couldn't get primary IPI interrupt");
 395         }
 396
 397         if (psurge_type == PSURGE_DUAL)
 398                 psurge_dual_sync_tb(cpu_nr);
 399 }
 400
 401 void __init smp_psurge_take_timebase(void)
 402 {
 403         /* Dummy implementation */
 404 }
 405
 406 void __init smp_psurge_give_timebase(void)
 407 {
 408         /* Dummy implementation */
 409 }
 410
 411 /* PowerSurge-style Macs */
 412 struct smp_ops_t psurge_smp_ops = {
 413         .message_pass   = smp_psurge_message_pass,
 414         .probe          = smp_psurge_probe,
 415         .kick_cpu       = smp_psurge_kick_cpu,
 416         .setup_cpu      = smp_psurge_setup_cpu,
 417         .give_timebase  = smp_psurge_give_timebase,
 418         .take_timebase  = smp_psurge_take_timebase,
 419 };
 420 #endif /* CONFIG_PPC32 - actually powersurge support */
 421
 422 #ifdef CONFIG_PPC64
 423 /*
 424  * G5s enable/disable the timebase via an i2c-connected clock chip.
 425  */
 426 static struct device_node *pmac_tb_clock_chip_host;
 427 static u8 pmac_tb_pulsar_addr;
 428 static void (*pmac_tb_freeze)(int freeze);
 429 static DEFINE_SPINLOCK(timebase_lock);
 430 static unsigned long timebase;
 431
 432 static void smp_core99_cypress_tb_freeze(int freeze)
 433 {
 434         u8 data;
 435         int rc;
 436
 437         /* Strangely, the device-tree says address is 0xd2, but darwin
 438          * accesses 0xd0 ...
 439          */
 440         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_combined);
 441         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
 442                                0xd0 | pmac_low_i2c_read,
 443                                0x81, &data, 1);
 444         if (rc != 0)
 445                 goto bail;
 446
 447         data = (data & 0xf3) | (freeze ? 0x00 : 0x0c);
 448
 449         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_stdsub);
 450         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
 451                                0xd0 | pmac_low_i2c_write,
 452                                0x81, &data, 1);
 453
 454  bail:
 455         if (rc != 0) {
 456                 printk("Cypress Timebase %s rc: %d\n",
 457                        freeze ? "freeze" : "unfreeze", rc);
 458                 panic("Timebase freeze failed !\n");
 459         }
 460 }
 461
 462
 463 static void smp_core99_pulsar_tb_freeze(int freeze)
 464 {
 465         u8 data;
 466         int rc;
 467
 468         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_combined);
 469         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
 470                                pmac_tb_pulsar_addr | pmac_low_i2c_read,
 471                                0x2e, &data, 1);
 472         if (rc != 0)
 473                 goto bail;
 474
 475         data = (data & 0x88) | (freeze ? 0x11 : 0x22);
 476
 477         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_stdsub);
 478         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
 479                                pmac_tb_pulsar_addr | pmac_low_i2c_write,
 480                                0x2e, &data, 1);
 481  bail:
 482         if (rc != 0) {
 483                 printk(KERN_ERR "Pulsar Timebase %s rc: %d\n",
 484                        freeze ? "freeze" : "unfreeze", rc);
 485                 panic("Timebase freeze failed !\n");
 486         }
 487 }
 488
 489
 490 static void smp_core99_give_timebase(void)
 491 {
 492         /* Open i2c bus for synchronous access */
 493         if (pmac_low_i2c_open(pmac_tb_clock_chip_host, 0))
 494                 panic("Can't open i2c for TB sync !\n");
 495
 496         spin_lock(&timebase_lock);
 497         (*pmac_tb_freeze)(1);
 498         mb();
 499         timebase = get_tb();
 500         spin_unlock(&timebase_lock);
 501
 502         while (timebase)
 503                 barrier();
 504
 505         spin_lock(&timebase_lock);
 506         (*pmac_tb_freeze)(0);
 507         spin_unlock(&timebase_lock);
 508
 509         /* Close i2c bus */
 510         pmac_low_i2c_close(pmac_tb_clock_chip_host);
 511 }
 512
 513
 514 static void __devinit smp_core99_take_timebase(void)
 515 {
 516         while (!timebase)
 517                 barrier();
 518         spin_lock(&timebase_lock);
 519         set_tb(timebase >> 32, timebase & 0xffffffff);
 520         timebase = 0;
 521         spin_unlock(&timebase_lock);
 522 }
 523
 524 static void __init smp_core99_setup(int ncpus)
 525 {
 526         struct device_node *cc = NULL;
 527         struct device_node *p;
 528         u32 *reg;
 529         int ok;
 530
 531         /* HW sync only on these platforms */
 532         if (!machine_is_compatible("PowerMac7,2") &&
 533             !machine_is_compatible("PowerMac7,3") &&
 534             !machine_is_compatible("RackMac3,1"))
 535                 return;
 536
 537         /* Look for the clock chip */
 538         while ((cc = of_find_node_by_name(cc, "i2c-hwclock")) != NULL) {
 539                 p = of_get_parent(cc);
 540                 ok = p && device_is_compatible(p, "uni-n-i2c");
 541                 of_node_put(p);
 542                 if (!ok)
 543                         continue;
 544
 545                 reg = (u32 *)get_property(cc, "reg", NULL);
 546                 if (reg == NULL)
 547                         continue;
 548
 549                 switch (*reg) {
 550                 case 0xd2:
 551                         if (device_is_compatible(cc, "pulsar-legacy-slewing")) {
 552                                 pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
 553                                 pmac_tb_pulsar_addr = 0xd2;
 554                                 printk(KERN_INFO "Timebase clock is Pulsar chip\n");
 555                         } else if (device_is_compatible(cc, "cy28508")) {
 556                                 pmac_tb_freeze = smp_core99_cypress_tb_freeze;
 557                                 printk(KERN_INFO "Timebase clock is Cypress chip\n");
 558                         }
 559                         break;
 560                 case 0xd4:
 561                         pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
 562                         pmac_tb_pulsar_addr = 0xd4;
 563                         printk(KERN_INFO "Timebase clock is Pulsar chip\n");
 564                         break;
 565                 }
 566                 if (pmac_tb_freeze != NULL) {
 567                         pmac_tb_clock_chip_host = of_get_parent(cc);
 568                         of_node_put(cc);
 569                         break;
 570                 }
 571         }
 572         if (pmac_tb_freeze == NULL) {
 573                 smp_ops->give_timebase = smp_generic_give_timebase;
 574                 smp_ops->take_timebase = smp_generic_take_timebase;
 575         }
 576 }
 577
 578 /* nothing to do here, caches are already set up by service processor */
 579 static inline void __devinit core99_init_caches(int cpu)
 580 {
 581 }
 582
 583 #else /* CONFIG_PPC64 */
 584
 585 /*
 586  * SMP G4 powermacs use a GPIO to enable/disable the timebase.
 587  */
 588
 589 static unsigned int core99_tb_gpio;     /* Timebase freeze GPIO */
 590
 591 static unsigned int pri_tb_hi, pri_tb_lo;
 592 static unsigned int pri_tb_stamp;
 593
 594 /* not __init, called in sleep/wakeup code */
 595 void smp_core99_give_timebase(void)
 596 {
 597         unsigned long flags;
 598         unsigned int t;
 599
 600         /* wait for the secondary to be in take_timebase */
 601         for (t = 100000; t > 0 && !sec_tb_reset; --t)
 602                 udelay(10);
 603         if (!sec_tb_reset) {
 604                 printk(KERN_WARNING "Timeout waiting sync on second CPU\n");
 605                 return;
 606         }
 607
 608         /* freeze the timebase and read it */
 609         /* disable interrupts so the timebase is disabled for the
 610            shortest possible time */
 611         local_irq_save(flags);
 612         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4);
 613         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
 614         mb();
 615         pri_tb_hi = get_tbu();
 616         pri_tb_lo = get_tbl();
 617         pri_tb_stamp = last_jiffy_stamp(smp_processor_id());
 618         mb();
 619
 620         /* tell the secondary we're ready */
 621         sec_tb_reset = 2;
 622         mb();
 623
 624         /* wait for the secondary to have taken it */
 625         for (t = 100000; t > 0 && sec_tb_reset; --t)
 626                 udelay(10);
 627         if (sec_tb_reset)
 628                 printk(KERN_WARNING "Timeout waiting sync(2) on second CPU\n");
 629         else
 630                 smp_tb_synchronized = 1;
 631
 632         /* Now, restart the timebase by leaving the GPIO to an open collector */
 633         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0);
 634         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
 635         local_irq_restore(flags);
 636 }
 637
 638 /* not __init, called in sleep/wakeup code */
 639 void smp_core99_take_timebase(void)
 640 {
 641         unsigned long flags;
 642
 643         /* tell the primary we're here */
 644         sec_tb_reset = 1;
 645         mb();
 646
 647         /* wait for the primary to set pri_tb_hi/lo */
 648         while (sec_tb_reset < 2)
 649                 mb();
 650
 651         /* set our stuff the same as the primary */
 652         local_irq_save(flags);
 653         set_dec(1);
 654         set_tb(pri_tb_hi, pri_tb_lo);
 655         last_jiffy_stamp(smp_processor_id()) = pri_tb_stamp;
 656         mb();
 657
 658         /* tell the primary we're done */
 659         sec_tb_reset = 0;
 660         mb();
 661         local_irq_restore(flags);
 662 }
 663
 664 /* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */
 665 volatile static long int core99_l2_cache;
 666 volatile static long int core99_l3_cache;
 667
 668 static void __devinit core99_init_caches(int cpu)
 669 {
 670         if (!cpu_has_feature(CPU_FTR_L2CR))
 671                 return;
 672
 673         if (cpu == 0) {
 674                 core99_l2_cache = _get_L2CR();
 675                 printk("CPU0: L2CR is %lx\n", core99_l2_cache);
 676         } else {
 677                 printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
 678                 _set_L2CR(0);
 679                 _set_L2CR(core99_l2_cache);
 680                 printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
 681         }
 682
 683         if (!cpu_has_feature(CPU_FTR_L3CR))
 684                 return;
 685
 686         if (cpu == 0){
 687                 core99_l3_cache = _get_L3CR();
 688                 printk("CPU0: L3CR is %lx\n", core99_l3_cache);
 689         } else {
 690                 printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
 691                 _set_L3CR(0);
 692                 _set_L3CR(core99_l3_cache);
 693                 printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
 694         }
 695 }
 696
 697 static void __init smp_core99_setup(int ncpus)
 698 {
 699         struct device_node *cpu;
 700         u32 *tbprop = NULL;
 701         int i;
 702
 703         core99_tb_gpio = KL_GPIO_TB_ENABLE;     /* default value */
 704         cpu = of_find_node_by_type(NULL, "cpu");
 705         if (cpu != NULL) {
 706                 tbprop = (u32 *)get_property(cpu, "timebase-enable", NULL);
 707                 if (tbprop)
 708                         core99_tb_gpio = *tbprop;
 709                 of_node_put(cpu);
 710         }
 711
 712         /* XXX should get this from reg properties */
 713         for (i = 1; i < ncpus; ++i)
 714                 smp_hw_index[i] = i;
 715         powersave_nap = 0;
 716 }
 717 #endif
 718
 719 static int __init smp_core99_probe(void)
 720 {
 721         struct device_node *cpus;
 722         int ncpus = 0;
 723
 724         if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
 725
 726         /* Count CPUs in the device-tree */
 727         for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;)
 728                 ++ncpus;
 729
 730         printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus);
 731
 732         /* Nothing more to do if less than 2 of them */
 733         if (ncpus <= 1)
 734                 return 1;
 735
 736         smp_core99_setup(ncpus);
 737         mpic_request_ipis();
 738         core99_init_caches(0);
 739
 740         return ncpus;
 741 }
 742
 743 static void __devinit smp_core99_kick_cpu(int nr)
 744 {
 745         unsigned int save_vector;
 746         unsigned long new_vector;
 747         unsigned long flags;
 748         volatile unsigned int *vector
 749                  = ((volatile unsigned int *)(KERNELBASE+0x100));
 750
 751         if (nr < 0 || nr > 3)
 752                 return;
 753         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu", 0x346);
 754
 755         local_irq_save(flags);
 756         local_irq_disable();
 757
 758         /* Save reset vector */
 759         save_vector = *vector;
 760
 761         /* Setup fake reset vector that does
 762          *   b __secondary_start_pmac_0 + nr*8 - KERNELBASE
 763          */
 764         new_vector = (unsigned long) __secondary_start_pmac_0 + nr * 8;
 765         *vector = 0x48000002 + new_vector - KERNELBASE;
 766
 767         /* flush data cache and inval instruction cache */
 768         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
 769
 770         /* Put some life in our friend */
 771         pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
 772
 773         /* FIXME: We wait a bit for the CPU to take the exception, I should
 774          * instead wait for the entry code to set something for me. Well,
 775          * ideally, all that crap will be done in prom.c and the CPU left
 776          * in a RAM-based wait loop like CHRP.
 777          */
 778         mdelay(1);
 779
 780         /* Restore our exception vector */
 781         *vector = save_vector;
 782         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
 783
 784         local_irq_restore(flags);
 785         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
 786 }
 787
 788 static void __devinit smp_core99_setup_cpu(int cpu_nr)
 789 {
 790         /* Setup L2/L3 */
 791         if (cpu_nr != 0)
 792                 core99_init_caches(cpu_nr);
 793
 794         /* Setup openpic */
 795         mpic_setup_this_cpu();
 796
 797         if (cpu_nr == 0) {
 798 #ifdef CONFIG_POWER4
 799                 extern void g5_phy_disable_cpu1(void);
 800
 801                 /* If we didn't start the second CPU, we must take
 802                  * it off the bus
 803                  */
 804                 if (machine_is_compatible("MacRISC4") &&
 805                     num_online_cpus() < 2)
 806                         g5_phy_disable_cpu1();
 807 #endif /* CONFIG_POWER4 */
 808                 if (ppc_md.progress) ppc_md.progress("core99_setup_cpu 0 done", 0x349);
 809         }
 810 }
 811
 812
 813 /* Core99 Macs (dual G4s and G5s) */
 814 struct smp_ops_t core99_smp_ops = {
 815         .message_pass   = smp_mpic_message_pass,
 816         .probe          = smp_core99_probe,
 817         .kick_cpu       = smp_core99_kick_cpu,
 818         .setup_cpu      = smp_core99_setup_cpu,
 819         .give_timebase  = smp_core99_give_timebase,
 820         .take_timebase  = smp_core99_take_timebase,
 821 };
 822
 823 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
 824
 825 int __cpu_disable(void)
 826 {
 827         cpu_clear(smp_processor_id(), cpu_online_map);
 828
 829         /* XXX reset cpu affinity here */
 830         mpic_cpu_set_priority(0xf);
 831         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 832         mb();
 833         udelay(20);
 834         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 835         return 0;
 836 }
 837
 838 extern void low_cpu_die(void) __attribute__((noreturn)); /* in sleep.S */
 839 static int cpu_dead[NR_CPUS];
 840
 841 void cpu_die(void)
 842 {
 843         local_irq_disable();
 844         cpu_dead[smp_processor_id()] = 1;
 845         mb();
 846         low_cpu_die();
 847 }
 848
 849 void __cpu_die(unsigned int cpu)
 850 {
 851         int timeout;
 852
 853         timeout = 1000;
 854         while (!cpu_dead[cpu]) {
 855                 if (--timeout == 0) {
 856                         printk("CPU %u refused to die!\n", cpu);
 857                         break;
 858                 }
 859                 msleep(1);
 860         }
 861         cpu_callin_map[cpu] = 0;
 862         cpu_dead[cpu] = 0;
 863 }
 864
 865 #endif