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         /*
 309          * This is necessary because OF doesn't know about the
 310          * secondary cpu(s), and thus there aren't nodes in the
 311          * device tree for them, and smp_setup_cpu_maps hasn't
 312          * set their bits in cpu_possible_map and cpu_present_map.
 313          */
 314         if (ncpus > NR_CPUS)
 315                 ncpus = NR_CPUS;
 316         for (i = 1; i < ncpus ; ++i) {
 317                 cpu_set(i, cpu_present_map);
 318                 cpu_set(i, cpu_possible_map);
 319                 set_hard_smp_processor_id(i, i);
 320         }
 321
 322         if (ppc_md.progress) ppc_md.progress("smp_psurge_probe - done", 0x352);
 323
 324         return ncpus;
 325 }
 326
 327 static void __init smp_psurge_kick_cpu(int nr)
 328 {
 329         unsigned long start = __pa(__secondary_start_pmac_0) + nr * 8;
 330         unsigned long a;
 331
 332         /* may need to flush here if secondary bats aren't setup */
 333         for (a = KERNELBASE; a < KERNELBASE + 0x800000; a += 32)
 334                 asm volatile("dcbf 0,%0" : : "r" (a) : "memory");
 335         asm volatile("sync");
 336
 337         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu", 0x353);
 338
 339         out_be32(psurge_start, start);
 340         mb();
 341
 342         psurge_set_ipi(nr);
 343         udelay(10);
 344         psurge_clr_ipi(nr);
 345
 346         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354);
 347 }
 348
 349 /*
 350  * With the dual-cpu powersurge board, the decrementers and timebases
 351  * of both cpus are frozen after the secondary cpu is started up,
 352  * until we give the secondary cpu another interrupt.  This routine
 353  * uses this to get the timebases synchronized.
 354  *  -- paulus.
 355  */
 356 static void __init psurge_dual_sync_tb(int cpu_nr)
 357 {
 358         int t;
 359
 360         set_dec(tb_ticks_per_jiffy);
 361         /* XXX fixme */
 362         set_tb(0, 0);
 363         last_jiffy_stamp(cpu_nr) = 0;
 364
 365         if (cpu_nr > 0) {
 366                 mb();
 367                 sec_tb_reset = 1;
 368                 return;
 369         }
 370
 371         /* wait for the secondary to have reset its TB before proceeding */
 372         for (t = 10000000; t > 0 && !sec_tb_reset; --t)
 373                 ;
 374
 375         /* now interrupt the secondary, starting both TBs */
 376         psurge_set_ipi(1);
 377 }
 378
 379 static struct irqaction psurge_irqaction = {
 380         .handler = psurge_primary_intr,
 381         .flags = SA_INTERRUPT,
 382         .mask = CPU_MASK_NONE,
 383         .name = "primary IPI",
 384 };
 385
 386 static void __init smp_psurge_setup_cpu(int cpu_nr)
 387 {
 388
 389         if (cpu_nr == 0) {
 390                 /* If we failed to start the second CPU, we should still
 391                  * send it an IPI to start the timebase & DEC or we might
 392                  * have them stuck.
 393                  */
 394                 if (num_online_cpus() < 2) {
 395                         if (psurge_type == PSURGE_DUAL)
 396                                 psurge_set_ipi(1);
 397                         return;
 398                 }
 399                 /* reset the entry point so if we get another intr we won't
 400                  * try to startup again */
 401                 out_be32(psurge_start, 0x100);
 402                 if (setup_irq(30, &psurge_irqaction))
 403                         printk(KERN_ERR "Couldn't get primary IPI interrupt");
 404         }
 405
 406         if (psurge_type == PSURGE_DUAL)
 407                 psurge_dual_sync_tb(cpu_nr);
 408 }
 409
 410 void __init smp_psurge_take_timebase(void)
 411 {
 412         /* Dummy implementation */
 413 }
 414
 415 void __init smp_psurge_give_timebase(void)
 416 {
 417         /* Dummy implementation */
 418 }
 419
 420 /* PowerSurge-style Macs */
 421 struct smp_ops_t psurge_smp_ops = {
 422         .message_pass   = smp_psurge_message_pass,
 423         .probe          = smp_psurge_probe,
 424         .kick_cpu       = smp_psurge_kick_cpu,
 425         .setup_cpu      = smp_psurge_setup_cpu,
 426         .give_timebase  = smp_psurge_give_timebase,
 427         .take_timebase  = smp_psurge_take_timebase,
 428 };
 429 #endif /* CONFIG_PPC32 - actually powersurge support */
 430
 431 #ifdef CONFIG_PPC64
 432 /*
 433  * G5s enable/disable the timebase via an i2c-connected clock chip.
 434  */
 435 static struct device_node *pmac_tb_clock_chip_host;
 436 static u8 pmac_tb_pulsar_addr;
 437 static void (*pmac_tb_freeze)(int freeze);
 438 static DEFINE_SPINLOCK(timebase_lock);
 439 static unsigned long timebase;
 440
 441 static void smp_core99_cypress_tb_freeze(int freeze)
 442 {
 443         u8 data;
 444         int rc;
 445
 446         /* Strangely, the device-tree says address is 0xd2, but darwin
 447          * accesses 0xd0 ...
 448          */
 449         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_combined);
 450         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
 451                                0xd0 | pmac_low_i2c_read,
 452                                0x81, &data, 1);
 453         if (rc != 0)
 454                 goto bail;
 455
 456         data = (data & 0xf3) | (freeze ? 0x00 : 0x0c);
 457
 458         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_stdsub);
 459         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
 460                                0xd0 | pmac_low_i2c_write,
 461                                0x81, &data, 1);
 462
 463  bail:
 464         if (rc != 0) {
 465                 printk("Cypress Timebase %s rc: %d\n",
 466                        freeze ? "freeze" : "unfreeze", rc);
 467                 panic("Timebase freeze failed !\n");
 468         }
 469 }
 470
 471
 472 static void smp_core99_pulsar_tb_freeze(int freeze)
 473 {
 474         u8 data;
 475         int rc;
 476
 477         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_combined);
 478         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
 479                                pmac_tb_pulsar_addr | pmac_low_i2c_read,
 480                                0x2e, &data, 1);
 481         if (rc != 0)
 482                 goto bail;
 483
 484         data = (data & 0x88) | (freeze ? 0x11 : 0x22);
 485
 486         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_stdsub);
 487         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
 488                                pmac_tb_pulsar_addr | pmac_low_i2c_write,
 489                                0x2e, &data, 1);
 490  bail:
 491         if (rc != 0) {
 492                 printk(KERN_ERR "Pulsar Timebase %s rc: %d\n",
 493                        freeze ? "freeze" : "unfreeze", rc);
 494                 panic("Timebase freeze failed !\n");
 495         }
 496 }
 497
 498
 499 static void smp_core99_give_timebase(void)
 500 {
 501         /* Open i2c bus for synchronous access */
 502         if (pmac_low_i2c_open(pmac_tb_clock_chip_host, 0))
 503                 panic("Can't open i2c for TB sync !\n");
 504
 505         spin_lock(&timebase_lock);
 506         (*pmac_tb_freeze)(1);
 507         mb();
 508         timebase = get_tb();
 509         spin_unlock(&timebase_lock);
 510
 511         while (timebase)
 512                 barrier();
 513
 514         spin_lock(&timebase_lock);
 515         (*pmac_tb_freeze)(0);
 516         spin_unlock(&timebase_lock);
 517
 518         /* Close i2c bus */
 519         pmac_low_i2c_close(pmac_tb_clock_chip_host);
 520 }
 521
 522
 523 static void __devinit smp_core99_take_timebase(void)
 524 {
 525         while (!timebase)
 526                 barrier();
 527         spin_lock(&timebase_lock);
 528         set_tb(timebase >> 32, timebase & 0xffffffff);
 529         timebase = 0;
 530         spin_unlock(&timebase_lock);
 531 }
 532
 533 static void __init smp_core99_setup(int ncpus)
 534 {
 535         struct device_node *cc = NULL;
 536         struct device_node *p;
 537         u32 *reg;
 538         int ok;
 539
 540         /* HW sync only on these platforms */
 541         if (!machine_is_compatible("PowerMac7,2") &&
 542             !machine_is_compatible("PowerMac7,3") &&
 543             !machine_is_compatible("RackMac3,1"))
 544                 return;
 545
 546         /* Look for the clock chip */
 547         while ((cc = of_find_node_by_name(cc, "i2c-hwclock")) != NULL) {
 548                 p = of_get_parent(cc);
 549                 ok = p && device_is_compatible(p, "uni-n-i2c");
 550                 of_node_put(p);
 551                 if (!ok)
 552                         continue;
 553
 554                 reg = (u32 *)get_property(cc, "reg", NULL);
 555                 if (reg == NULL)
 556                         continue;
 557
 558                 switch (*reg) {
 559                 case 0xd2:
 560                         if (device_is_compatible(cc, "pulsar-legacy-slewing")) {
 561                                 pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
 562                                 pmac_tb_pulsar_addr = 0xd2;
 563                                 printk(KERN_INFO "Timebase clock is Pulsar chip\n");
 564                         } else if (device_is_compatible(cc, "cy28508")) {
 565                                 pmac_tb_freeze = smp_core99_cypress_tb_freeze;
 566                                 printk(KERN_INFO "Timebase clock is Cypress chip\n");
 567                         }
 568                         break;
 569                 case 0xd4:
 570                         pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
 571                         pmac_tb_pulsar_addr = 0xd4;
 572                         printk(KERN_INFO "Timebase clock is Pulsar chip\n");
 573                         break;
 574                 }
 575                 if (pmac_tb_freeze != NULL) {
 576                         pmac_tb_clock_chip_host = of_get_parent(cc);
 577                         of_node_put(cc);
 578                         break;
 579                 }
 580         }
 581         if (pmac_tb_freeze == NULL) {
 582                 smp_ops->give_timebase = smp_generic_give_timebase;
 583                 smp_ops->take_timebase = smp_generic_take_timebase;
 584         }
 585 }
 586
 587 /* nothing to do here, caches are already set up by service processor */
 588 static inline void __devinit core99_init_caches(int cpu)
 589 {
 590 }
 591
 592 #else /* CONFIG_PPC64 */
 593
 594 /*
 595  * SMP G4 powermacs use a GPIO to enable/disable the timebase.
 596  */
 597
 598 static unsigned int core99_tb_gpio;     /* Timebase freeze GPIO */
 599
 600 static unsigned int pri_tb_hi, pri_tb_lo;
 601 static unsigned int pri_tb_stamp;
 602
 603 /* not __init, called in sleep/wakeup code */
 604 void smp_core99_give_timebase(void)
 605 {
 606         unsigned long flags;
 607         unsigned int t;
 608
 609         /* wait for the secondary to be in take_timebase */
 610         for (t = 100000; t > 0 && !sec_tb_reset; --t)
 611                 udelay(10);
 612         if (!sec_tb_reset) {
 613                 printk(KERN_WARNING "Timeout waiting sync on second CPU\n");
 614                 return;
 615         }
 616
 617         /* freeze the timebase and read it */
 618         /* disable interrupts so the timebase is disabled for the
 619            shortest possible time */
 620         local_irq_save(flags);
 621         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4);
 622         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
 623         mb();
 624         pri_tb_hi = get_tbu();
 625         pri_tb_lo = get_tbl();
 626         pri_tb_stamp = last_jiffy_stamp(smp_processor_id());
 627         mb();
 628
 629         /* tell the secondary we're ready */
 630         sec_tb_reset = 2;
 631         mb();
 632
 633         /* wait for the secondary to have taken it */
 634         for (t = 100000; t > 0 && sec_tb_reset; --t)
 635                 udelay(10);
 636         if (sec_tb_reset)
 637                 /* XXX BUG_ON here? */
 638                 printk(KERN_WARNING "Timeout waiting sync(2) on second CPU\n");
 639
 640         /* Now, restart the timebase by leaving the GPIO to an open collector */
 641         pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0);
 642         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
 643         local_irq_restore(flags);
 644 }
 645
 646 /* not __init, called in sleep/wakeup code */
 647 void smp_core99_take_timebase(void)
 648 {
 649         unsigned long flags;
 650
 651         /* tell the primary we're here */
 652         sec_tb_reset = 1;
 653         mb();
 654
 655         /* wait for the primary to set pri_tb_hi/lo */
 656         while (sec_tb_reset < 2)
 657                 mb();
 658
 659         /* set our stuff the same as the primary */
 660         local_irq_save(flags);
 661         set_dec(1);
 662         set_tb(pri_tb_hi, pri_tb_lo);
 663         last_jiffy_stamp(smp_processor_id()) = pri_tb_stamp;
 664         mb();
 665
 666         /* tell the primary we're done */
 667         sec_tb_reset = 0;
 668         mb();
 669         local_irq_restore(flags);
 670 }
 671
 672 /* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */
 673 volatile static long int core99_l2_cache;
 674 volatile static long int core99_l3_cache;
 675
 676 static void __devinit core99_init_caches(int cpu)
 677 {
 678         if (!cpu_has_feature(CPU_FTR_L2CR))
 679                 return;
 680
 681         if (cpu == 0) {
 682                 core99_l2_cache = _get_L2CR();
 683                 printk("CPU0: L2CR is %lx\n", core99_l2_cache);
 684         } else {
 685                 printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
 686                 _set_L2CR(0);
 687                 _set_L2CR(core99_l2_cache);
 688                 printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
 689         }
 690
 691         if (!cpu_has_feature(CPU_FTR_L3CR))
 692                 return;
 693
 694         if (cpu == 0){
 695                 core99_l3_cache = _get_L3CR();
 696                 printk("CPU0: L3CR is %lx\n", core99_l3_cache);
 697         } else {
 698                 printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
 699                 _set_L3CR(0);
 700                 _set_L3CR(core99_l3_cache);
 701                 printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
 702         }
 703 }
 704
 705 static void __init smp_core99_setup(int ncpus)
 706 {
 707         struct device_node *cpu;
 708         u32 *tbprop = NULL;
 709         int i;
 710
 711         core99_tb_gpio = KL_GPIO_TB_ENABLE;     /* default value */
 712         cpu = of_find_node_by_type(NULL, "cpu");
 713         if (cpu != NULL) {
 714                 tbprop = (u32 *)get_property(cpu, "timebase-enable", NULL);
 715                 if (tbprop)
 716                         core99_tb_gpio = *tbprop;
 717                 of_node_put(cpu);
 718         }
 719
 720         /* XXX should get this from reg properties */
 721         for (i = 1; i < ncpus; ++i)
 722                 smp_hw_index[i] = i;
 723         powersave_nap = 0;
 724 }
 725 #endif
 726
 727 static int __init smp_core99_probe(void)
 728 {
 729         struct device_node *cpus;
 730         int ncpus = 0;
 731
 732         if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
 733
 734         /* Count CPUs in the device-tree */
 735         for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;)
 736                 ++ncpus;
 737
 738         printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus);
 739
 740         /* Nothing more to do if less than 2 of them */
 741         if (ncpus <= 1)
 742                 return 1;
 743
 744         smp_core99_setup(ncpus);
 745         mpic_request_ipis();
 746         core99_init_caches(0);
 747
 748         return ncpus;
 749 }
 750
 751 static void __devinit smp_core99_kick_cpu(int nr)
 752 {
 753         unsigned int save_vector;
 754         unsigned long new_vector;
 755         unsigned long flags;
 756         volatile unsigned int *vector
 757                  = ((volatile unsigned int *)(KERNELBASE+0x100));
 758
 759         if (nr < 0 || nr > 3)
 760                 return;
 761         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu", 0x346);
 762
 763         local_irq_save(flags);
 764         local_irq_disable();
 765
 766         /* Save reset vector */
 767         save_vector = *vector;
 768
 769         /* Setup fake reset vector that does
 770          *   b __secondary_start_pmac_0 + nr*8 - KERNELBASE
 771          */
 772         new_vector = (unsigned long) __secondary_start_pmac_0 + nr * 8;
 773         *vector = 0x48000002 + new_vector - KERNELBASE;
 774
 775         /* flush data cache and inval instruction cache */
 776         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
 777
 778         /* Put some life in our friend */
 779         pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
 780
 781         /* FIXME: We wait a bit for the CPU to take the exception, I should
 782          * instead wait for the entry code to set something for me. Well,
 783          * ideally, all that crap will be done in prom.c and the CPU left
 784          * in a RAM-based wait loop like CHRP.
 785          */
 786         mdelay(1);
 787
 788         /* Restore our exception vector */
 789         *vector = save_vector;
 790         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
 791
 792         local_irq_restore(flags);
 793         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
 794 }
 795
 796 static void __devinit smp_core99_setup_cpu(int cpu_nr)
 797 {
 798         /* Setup L2/L3 */
 799         if (cpu_nr != 0)
 800                 core99_init_caches(cpu_nr);
 801
 802         /* Setup openpic */
 803         mpic_setup_this_cpu();
 804
 805         if (cpu_nr == 0) {
 806 #ifdef CONFIG_POWER4
 807                 extern void g5_phy_disable_cpu1(void);
 808
 809                 /* If we didn't start the second CPU, we must take
 810                  * it off the bus
 811                  */
 812                 if (machine_is_compatible("MacRISC4") &&
 813                     num_online_cpus() < 2)
 814                         g5_phy_disable_cpu1();
 815 #endif /* CONFIG_POWER4 */
 816                 if (ppc_md.progress) ppc_md.progress("core99_setup_cpu 0 done", 0x349);
 817         }
 818 }
 819
 820
 821 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
 822
 823 int smp_core99_cpu_disable(void)
 824 {
 825         cpu_clear(smp_processor_id(), cpu_online_map);
 826
 827         /* XXX reset cpu affinity here */
 828         mpic_cpu_set_priority(0xf);
 829         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 830         mb();
 831         udelay(20);
 832         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 833         return 0;
 834 }
 835
 836 extern void low_cpu_die(void) __attribute__((noreturn)); /* in sleep.S */
 837 static int cpu_dead[NR_CPUS];
 838
 839 void cpu_die(void)
 840 {
 841         local_irq_disable();
 842         cpu_dead[smp_processor_id()] = 1;
 843         mb();
 844         low_cpu_die();
 845 }
 846
 847 void smp_core99_cpu_die(unsigned int cpu)
 848 {
 849         int timeout;
 850
 851         timeout = 1000;
 852         while (!cpu_dead[cpu]) {
 853                 if (--timeout == 0) {
 854                         printk("CPU %u refused to die!\n", cpu);
 855                         break;
 856                 }
 857                 msleep(1);
 858         }
 859         cpu_dead[cpu] = 0;
 860 }
 861
 862 #endif
 863
 864 /* Core99 Macs (dual G4s and G5s) */
 865 struct smp_ops_t core99_smp_ops = {
 866         .message_pass   = smp_mpic_message_pass,
 867         .probe          = smp_core99_probe,
 868         .kick_cpu       = smp_core99_kick_cpu,
 869         .setup_cpu      = smp_core99_setup_cpu,
 870         .give_timebase  = smp_core99_give_timebase,
 871         .take_timebase  = smp_core99_take_timebase,
 872 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
 873         .cpu_disable    = smp_core99_cpu_disable,
 874         .cpu_die        = smp_core99_cpu_die,
 875 #endif
 876 };