git.oblomov.eu Git - linux-2.6/blob - 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 #include <linux/compiler.h>
  38
  39 #include <asm/ptrace.h>
  40 #include <asm/atomic.h>
  41 #include <asm/irq.h>
  42 #include <asm/page.h>
  43 #include <asm/pgtable.h>
  44 #include <asm/sections.h>
  45 #include <asm/io.h>
  46 #include <asm/prom.h>
  47 #include <asm/smp.h>
  48 #include <asm/machdep.h>
  49 #include <asm/pmac_feature.h>
  50 #include <asm/time.h>
  51 #include <asm/mpic.h>
  52 #include <asm/cacheflush.h>
  53 #include <asm/keylargo.h>
  54 #include <asm/pmac_low_i2c.h>
  55 #include <asm/pmac_pfunc.h>
  56
  57 #define DEBUG
  58
  59 #ifdef DEBUG
  60 #define DBG(fmt...) udbg_printf(fmt)
  61 #else
  62 #define DBG(fmt...)
  63 #endif
  64
  65 extern void __secondary_start_pmac_0(void);
  66 extern int pmac_pfunc_base_install(void);
  67
  68 #ifdef CONFIG_PPC32
  69
  70 /* Sync flag for HW tb sync */
  71 static volatile int sec_tb_reset = 0;
  72
  73 /*
  74  * Powersurge (old powermac SMP) support.
  75  */
  76
  77 /* Addresses for powersurge registers */
  78 #define HAMMERHEAD_BASE         0xf8000000
  79 #define HHEAD_CONFIG            0x90
  80 #define HHEAD_SEC_INTR          0xc0
  81
  82 /* register for interrupting the primary processor on the powersurge */
  83 /* N.B. this is actually the ethernet ROM! */
  84 #define PSURGE_PRI_INTR         0xf3019000
  85
  86 /* register for storing the start address for the secondary processor */
  87 /* N.B. this is the PCI config space address register for the 1st bridge */
  88 #define PSURGE_START            0xf2800000
  89
  90 /* Daystar/XLR8 4-CPU card */
  91 #define PSURGE_QUAD_REG_ADDR    0xf8800000
  92
  93 #define PSURGE_QUAD_IRQ_SET     0
  94 #define PSURGE_QUAD_IRQ_CLR     1
  95 #define PSURGE_QUAD_IRQ_PRIMARY 2
  96 #define PSURGE_QUAD_CKSTOP_CTL  3
  97 #define PSURGE_QUAD_PRIMARY_ARB 4
  98 #define PSURGE_QUAD_BOARD_ID    6
  99 #define PSURGE_QUAD_WHICH_CPU   7
 100 #define PSURGE_QUAD_CKSTOP_RDBK 8
 101 #define PSURGE_QUAD_RESET_CTL   11
 102
 103 #define PSURGE_QUAD_OUT(r, v)   (out_8(quad_base + ((r) << 4) + 4, (v)))
 104 #define PSURGE_QUAD_IN(r)       (in_8(quad_base + ((r) << 4) + 4) & 0x0f)
 105 #define PSURGE_QUAD_BIS(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) | (v)))
 106 #define PSURGE_QUAD_BIC(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) & ~(v)))
 107
 108 /* virtual addresses for the above */
 109 static volatile u8 __iomem *hhead_base;
 110 static volatile u8 __iomem *quad_base;
 111 static volatile u32 __iomem *psurge_pri_intr;
 112 static volatile u8 __iomem *psurge_sec_intr;
 113 static volatile u32 __iomem *psurge_start;
 114
 115 /* values for psurge_type */
 116 #define PSURGE_NONE             -1
 117 #define PSURGE_DUAL             0
 118 #define PSURGE_QUAD_OKEE        1
 119 #define PSURGE_QUAD_COTTON      2
 120 #define PSURGE_QUAD_ICEGRASS    3
 121
 122 /* what sort of powersurge board we have */
 123 static int psurge_type = PSURGE_NONE;
 124
 125 /*
 126  * Set and clear IPIs for powersurge.
 127  */
 128 static inline void psurge_set_ipi(int cpu)
 129 {
 130         if (psurge_type == PSURGE_NONE)
 131                 return;
 132         if (cpu == 0)
 133                 in_be32(psurge_pri_intr);
 134         else if (psurge_type == PSURGE_DUAL)
 135                 out_8(psurge_sec_intr, 0);
 136         else
 137                 PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_SET, 1 << cpu);
 138 }
 139
 140 static inline void psurge_clr_ipi(int cpu)
 141 {
 142         if (cpu > 0) {
 143                 switch(psurge_type) {
 144                 case PSURGE_DUAL:
 145                         out_8(psurge_sec_intr, ~0);
 146                 case PSURGE_NONE:
 147                         break;
 148                 default:
 149                         PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, 1 << cpu);
 150                 }
 151         }
 152 }
 153
 154 /*
 155  * On powersurge (old SMP powermac architecture) we don't have
 156  * separate IPIs for separate messages like openpic does.  Instead
 157  * we have a bitmap for each processor, where a 1 bit means that
 158  * the corresponding message is pending for that processor.
 159  * Ideally each cpu's entry would be in a different cache line.
 160  *  -- paulus.
 161  */
 162 static unsigned long psurge_smp_message[NR_CPUS];
 163
 164 void psurge_smp_message_recv(struct pt_regs *regs)
 165 {
 166         int cpu = smp_processor_id();
 167         int msg;
 168
 169         /* clear interrupt */
 170         psurge_clr_ipi(cpu);
 171
 172         if (num_online_cpus() < 2)
 173                 return;
 174
 175         /* make sure there is a message there */
 176         for (msg = 0; msg < 4; msg++)
 177                 if (test_and_clear_bit(msg, &psurge_smp_message[cpu]))
 178                         smp_message_recv(msg, regs);
 179 }
 180
 181 irqreturn_t psurge_primary_intr(int irq, void *d, struct pt_regs *regs)
 182 {
 183         psurge_smp_message_recv(regs);
 184         return IRQ_HANDLED;
 185 }
 186
 187 static void smp_psurge_message_pass(int target, int msg)
 188 {
 189         int i;
 190
 191         if (num_online_cpus() < 2)
 192                 return;
 193
 194         for_each_online_cpu(i) {
 195                 if (target == MSG_ALL
 196                     || (target == MSG_ALL_BUT_SELF && i != smp_processor_id())
 197                     || target == i) {
 198                         set_bit(msg, &psurge_smp_message[i]);
 199                         psurge_set_ipi(i);
 200                 }
 201         }
 202 }
 203
 204 /*
 205  * Determine a quad card presence. We read the board ID register, we
 206  * force the data bus to change to something else, and we read it again.
 207  * It it's stable, then the register probably exist (ugh !)
 208  */
 209 static int __init psurge_quad_probe(void)
 210 {
 211         int type;
 212         unsigned int i;
 213
 214         type = PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID);
 215         if (type < PSURGE_QUAD_OKEE || type > PSURGE_QUAD_ICEGRASS
 216             || type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID))
 217                 return PSURGE_DUAL;
 218
 219         /* looks OK, try a slightly more rigorous test */
 220         /* bogus is not necessarily cacheline-aligned,
 221            though I don't suppose that really matters.  -- paulus */
 222         for (i = 0; i < 100; i++) {
 223                 volatile u32 bogus[8];
 224                 bogus[(0+i)%8] = 0x00000000;
 225                 bogus[(1+i)%8] = 0x55555555;
 226                 bogus[(2+i)%8] = 0xFFFFFFFF;
 227                 bogus[(3+i)%8] = 0xAAAAAAAA;
 228                 bogus[(4+i)%8] = 0x33333333;
 229                 bogus[(5+i)%8] = 0xCCCCCCCC;
 230                 bogus[(6+i)%8] = 0xCCCCCCCC;
 231                 bogus[(7+i)%8] = 0x33333333;
 232                 wmb();
 233                 asm volatile("dcbf 0,%0" : : "r" (bogus) : "memory");
 234                 mb();
 235                 if (type != PSURGE_QUAD_IN(PSURGE_QUAD_BOARD_ID))
 236                         return PSURGE_DUAL;
 237         }
 238         return type;
 239 }
 240
 241 static void __init psurge_quad_init(void)
 242 {
 243         int procbits;
 244
 245         if (ppc_md.progress) ppc_md.progress("psurge_quad_init", 0x351);
 246         procbits = ~PSURGE_QUAD_IN(PSURGE_QUAD_WHICH_CPU);
 247         if (psurge_type == PSURGE_QUAD_ICEGRASS)
 248                 PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits);
 249         else
 250                 PSURGE_QUAD_BIC(PSURGE_QUAD_CKSTOP_CTL, procbits);
 251         mdelay(33);
 252         out_8(psurge_sec_intr, ~0);
 253         PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, procbits);
 254         PSURGE_QUAD_BIS(PSURGE_QUAD_RESET_CTL, procbits);
 255         if (psurge_type != PSURGE_QUAD_ICEGRASS)
 256                 PSURGE_QUAD_BIS(PSURGE_QUAD_CKSTOP_CTL, procbits);
 257         PSURGE_QUAD_BIC(PSURGE_QUAD_PRIMARY_ARB, procbits);
 258         mdelay(33);
 259         PSURGE_QUAD_BIC(PSURGE_QUAD_RESET_CTL, procbits);
 260         mdelay(33);
 261         PSURGE_QUAD_BIS(PSURGE_QUAD_PRIMARY_ARB, procbits);
 262         mdelay(33);
 263 }
 264
 265 static int __init smp_psurge_probe(void)
 266 {
 267         int i, ncpus;
 268
 269         /* We don't do SMP on the PPC601 -- paulus */
 270         if (PVR_VER(mfspr(SPRN_PVR)) == 1)
 271                 return 1;
 272
 273         /*
 274          * The powersurge cpu board can be used in the generation
 275          * of powermacs that have a socket for an upgradeable cpu card,
 276          * including the 7500, 8500, 9500, 9600.
 277          * The device tree doesn't tell you if you have 2 cpus because
 278          * OF doesn't know anything about the 2nd processor.
 279          * Instead we look for magic bits in magic registers,
 280          * in the hammerhead memory controller in the case of the
 281          * dual-cpu powersurge board.  -- paulus.
 282          */
 283         if (find_devices("hammerhead") == NULL)
 284                 return 1;
 285
 286         hhead_base = ioremap(HAMMERHEAD_BASE, 0x800);
 287         quad_base = ioremap(PSURGE_QUAD_REG_ADDR, 1024);
 288         psurge_sec_intr = hhead_base + HHEAD_SEC_INTR;
 289
 290         psurge_type = psurge_quad_probe();
 291         if (psurge_type != PSURGE_DUAL) {
 292                 psurge_quad_init();
 293                 /* All released cards using this HW design have 4 CPUs */
 294                 ncpus = 4;
 295         } else {
 296                 iounmap(quad_base);
 297                 if ((in_8(hhead_base + HHEAD_CONFIG) & 0x02) == 0) {
 298                         /* not a dual-cpu card */
 299                         iounmap(hhead_base);
 300                         psurge_type = PSURGE_NONE;
 301                         return 1;
 302                 }
 303                 ncpus = 2;
 304         }
 305
 306         psurge_start = ioremap(PSURGE_START, 4);
 307         psurge_pri_intr = ioremap(PSURGE_PRI_INTR, 4);
 308
 309         /*
 310          * This is necessary because OF doesn't know about the
 311          * secondary cpu(s), and thus there aren't nodes in the
 312          * device tree for them, and smp_setup_cpu_maps hasn't
 313          * set their bits in cpu_possible_map and cpu_present_map.
 314          */
 315         if (ncpus > NR_CPUS)
 316                 ncpus = NR_CPUS;
 317         for (i = 1; i < ncpus ; ++i) {
 318                 cpu_set(i, cpu_present_map);
 319                 cpu_set(i, cpu_possible_map);
 320                 set_hard_smp_processor_id(i, i);
 321         }
 322
 323         if (ppc_md.progress) ppc_md.progress("smp_psurge_probe - done", 0x352);
 324
 325         return ncpus;
 326 }
 327
 328 static void __init smp_psurge_kick_cpu(int nr)
 329 {
 330         unsigned long start = __pa(__secondary_start_pmac_0) + nr * 8;
 331         unsigned long a;
 332
 333         /* may need to flush here if secondary bats aren't setup */
 334         for (a = KERNELBASE; a < KERNELBASE + 0x800000; a += 32)
 335                 asm volatile("dcbf 0,%0" : : "r" (a) : "memory");
 336         asm volatile("sync");
 337
 338         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu", 0x353);
 339
 340         out_be32(psurge_start, start);
 341         mb();
 342
 343         psurge_set_ipi(nr);
 344         udelay(10);
 345         psurge_clr_ipi(nr);
 346
 347         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354);
 348 }
 349
 350 /*
 351  * With the dual-cpu powersurge board, the decrementers and timebases
 352  * of both cpus are frozen after the secondary cpu is started up,
 353  * until we give the secondary cpu another interrupt.  This routine
 354  * uses this to get the timebases synchronized.
 355  *  -- paulus.
 356  */
 357 static void __init psurge_dual_sync_tb(int cpu_nr)
 358 {
 359         int t;
 360
 361         set_dec(tb_ticks_per_jiffy);
 362         /* XXX fixme */
 363         set_tb(0, 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 /*
 432  * Core 99 and later support
 433  */
 434
 435 static void (*pmac_tb_freeze)(int freeze);
 436 static u64 timebase;
 437 static int tb_req;
 438
 439 static void smp_core99_give_timebase(void)
 440 {
 441         unsigned long flags;
 442
 443         local_irq_save(flags);
 444
 445         while(!tb_req)
 446                 barrier();
 447         tb_req = 0;
 448         (*pmac_tb_freeze)(1);
 449         mb();
 450         timebase = get_tb();
 451         mb();
 452         while (timebase)
 453                 barrier();
 454         mb();
 455         (*pmac_tb_freeze)(0);
 456         mb();
 457
 458         local_irq_restore(flags);
 459 }
 460
 461
 462 static void __devinit smp_core99_take_timebase(void)
 463 {
 464         unsigned long flags;
 465
 466         local_irq_save(flags);
 467
 468         tb_req = 1;
 469         mb();
 470         while (!timebase)
 471                 barrier();
 472         mb();
 473         set_tb(timebase >> 32, timebase & 0xffffffff);
 474         timebase = 0;
 475         mb();
 476         set_dec(tb_ticks_per_jiffy/2);
 477
 478         local_irq_restore(flags);
 479 }
 480
 481 #ifdef CONFIG_PPC64
 482 /*
 483  * G5s enable/disable the timebase via an i2c-connected clock chip.
 484  */
 485 static struct pmac_i2c_bus *pmac_tb_clock_chip_host;
 486 static u8 pmac_tb_pulsar_addr;
 487
 488 static void smp_core99_cypress_tb_freeze(int freeze)
 489 {
 490         u8 data;
 491         int rc;
 492
 493         /* Strangely, the device-tree says address is 0xd2, but darwin
 494          * accesses 0xd0 ...
 495          */
 496         pmac_i2c_setmode(pmac_tb_clock_chip_host,
 497                          pmac_i2c_mode_combined);
 498         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
 499                            0xd0 | pmac_i2c_read,
 500                            1, 0x81, &data, 1);
 501         if (rc != 0)
 502                 goto bail;
 503
 504         data = (data & 0xf3) | (freeze ? 0x00 : 0x0c);
 505
 506         pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
 507         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
 508                            0xd0 | pmac_i2c_write,
 509                            1, 0x81, &data, 1);
 510
 511  bail:
 512         if (rc != 0) {
 513                 printk("Cypress Timebase %s rc: %d\n",
 514                        freeze ? "freeze" : "unfreeze", rc);
 515                 panic("Timebase freeze failed !\n");
 516         }
 517 }
 518
 519
 520 static void smp_core99_pulsar_tb_freeze(int freeze)
 521 {
 522         u8 data;
 523         int rc;
 524
 525         pmac_i2c_setmode(pmac_tb_clock_chip_host,
 526                          pmac_i2c_mode_combined);
 527         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
 528                            pmac_tb_pulsar_addr | pmac_i2c_read,
 529                            1, 0x2e, &data, 1);
 530         if (rc != 0)
 531                 goto bail;
 532
 533         data = (data & 0x88) | (freeze ? 0x11 : 0x22);
 534
 535         pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
 536         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
 537                            pmac_tb_pulsar_addr | pmac_i2c_write,
 538                            1, 0x2e, &data, 1);
 539  bail:
 540         if (rc != 0) {
 541                 printk(KERN_ERR "Pulsar Timebase %s rc: %d\n",
 542                        freeze ? "freeze" : "unfreeze", rc);
 543                 panic("Timebase freeze failed !\n");
 544         }
 545 }
 546
 547 static void __init smp_core99_setup_i2c_hwsync(int ncpus)
 548 {
 549         struct device_node *cc = NULL;
 550         struct device_node *p;
 551         const char *name = NULL;
 552         u32 *reg;
 553         int ok;
 554
 555         /* Look for the clock chip */
 556         while ((cc = of_find_node_by_name(cc, "i2c-hwclock")) != NULL) {
 557                 p = of_get_parent(cc);
 558                 ok = p && device_is_compatible(p, "uni-n-i2c");
 559                 of_node_put(p);
 560                 if (!ok)
 561                         continue;
 562
 563                 pmac_tb_clock_chip_host = pmac_i2c_find_bus(cc);
 564                 if (pmac_tb_clock_chip_host == NULL)
 565                         continue;
 566                 reg = (u32 *)get_property(cc, "reg", NULL);
 567                 if (reg == NULL)
 568                         continue;
 569                 switch (*reg) {
 570                 case 0xd2:
 571                         if (device_is_compatible(cc,"pulsar-legacy-slewing")) {
 572                                 pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
 573                                 pmac_tb_pulsar_addr = 0xd2;
 574                                 name = "Pulsar";
 575                         } else if (device_is_compatible(cc, "cy28508")) {
 576                                 pmac_tb_freeze = smp_core99_cypress_tb_freeze;
 577                                 name = "Cypress";
 578                         }
 579                         break;
 580                 case 0xd4:
 581                         pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
 582                         pmac_tb_pulsar_addr = 0xd4;
 583                         name = "Pulsar";
 584                         break;
 585                 }
 586                 if (pmac_tb_freeze != NULL)
 587                         break;
 588         }
 589         if (pmac_tb_freeze != NULL) {
 590                 /* Open i2c bus for synchronous access */
 591                 if (pmac_i2c_open(pmac_tb_clock_chip_host, 1)) {
 592                         printk(KERN_ERR "Failed top open i2c bus for clock"
 593                                " sync, fallback to software sync !\n");
 594                         goto no_i2c_sync;
 595                 }
 596                 printk(KERN_INFO "Processor timebase sync using %s i2c clock\n",
 597                        name);
 598                 return;
 599         }
 600  no_i2c_sync:
 601         pmac_tb_freeze = NULL;
 602         pmac_tb_clock_chip_host = NULL;
 603 }
 604
 605
 606
 607 /*
 608  * Newer G5s uses a platform function
 609  */
 610
 611 static void smp_core99_pfunc_tb_freeze(int freeze)
 612 {
 613         struct device_node *cpus;
 614         struct pmf_args args;
 615
 616         cpus = of_find_node_by_path("/cpus");
 617         BUG_ON(cpus == NULL);
 618         args.count = 1;
 619         args.u[0].v = !freeze;
 620         pmf_call_function(cpus, "cpu-timebase", &args);
 621         of_node_put(cpus);
 622 }
 623
 624 #else /* CONFIG_PPC64 */
 625
 626 /*
 627  * SMP G4 use a GPIO to enable/disable the timebase.
 628  */
 629
 630 static unsigned int core99_tb_gpio;     /* Timebase freeze GPIO */
 631
 632 static void smp_core99_gpio_tb_freeze(int freeze)
 633 {
 634         if (freeze)
 635                 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4);
 636         else
 637                 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0);
 638         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
 639 }
 640
 641
 642 #endif /* !CONFIG_PPC64 */
 643
 644 /* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */
 645 volatile static long int core99_l2_cache;
 646 volatile static long int core99_l3_cache;
 647
 648 static void __devinit core99_init_caches(int cpu)
 649 {
 650 #ifndef CONFIG_PPC64
 651         if (!cpu_has_feature(CPU_FTR_L2CR))
 652                 return;
 653
 654         if (cpu == 0) {
 655                 core99_l2_cache = _get_L2CR();
 656                 printk("CPU0: L2CR is %lx\n", core99_l2_cache);
 657         } else {
 658                 printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
 659                 _set_L2CR(0);
 660                 _set_L2CR(core99_l2_cache);
 661                 printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
 662         }
 663
 664         if (!cpu_has_feature(CPU_FTR_L3CR))
 665                 return;
 666
 667         if (cpu == 0){
 668                 core99_l3_cache = _get_L3CR();
 669                 printk("CPU0: L3CR is %lx\n", core99_l3_cache);
 670         } else {
 671                 printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
 672                 _set_L3CR(0);
 673                 _set_L3CR(core99_l3_cache);
 674                 printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
 675         }
 676 #endif /* !CONFIG_PPC64 */
 677 }
 678
 679 static void __init smp_core99_setup(int ncpus)
 680 {
 681 #ifdef CONFIG_PPC64
 682
 683         /* i2c based HW sync on some G5s */
 684         if (machine_is_compatible("PowerMac7,2") ||
 685             machine_is_compatible("PowerMac7,3") ||
 686             machine_is_compatible("RackMac3,1"))
 687                 smp_core99_setup_i2c_hwsync(ncpus);
 688
 689         /* pfunc based HW sync on recent G5s */
 690         if (pmac_tb_freeze == NULL) {
 691                 struct device_node *cpus =
 692                         of_find_node_by_path("/cpus");
 693                 if (cpus &&
 694                     get_property(cpus, "platform-cpu-timebase", NULL)) {
 695                         pmac_tb_freeze = smp_core99_pfunc_tb_freeze;
 696                         printk(KERN_INFO "Processor timebase sync using"
 697                                " platform function\n");
 698                 }
 699         }
 700
 701 #else /* CONFIG_PPC64 */
 702
 703         /* GPIO based HW sync on ppc32 Core99 */
 704         if (pmac_tb_freeze == NULL && !machine_is_compatible("MacRISC4")) {
 705                 struct device_node *cpu;
 706                 u32 *tbprop = NULL;
 707
 708                 core99_tb_gpio = KL_GPIO_TB_ENABLE;     /* default value */
 709                 cpu = of_find_node_by_type(NULL, "cpu");
 710                 if (cpu != NULL) {
 711                         tbprop = (u32 *)get_property(cpu, "timebase-enable",
 712                                                      NULL);
 713                         if (tbprop)
 714                                 core99_tb_gpio = *tbprop;
 715                         of_node_put(cpu);
 716                 }
 717                 pmac_tb_freeze = smp_core99_gpio_tb_freeze;
 718                 printk(KERN_INFO "Processor timebase sync using"
 719                        " GPIO 0x%02x\n", core99_tb_gpio);
 720         }
 721
 722 #endif /* CONFIG_PPC64 */
 723
 724         /* No timebase sync, fallback to software */
 725         if (pmac_tb_freeze == NULL) {
 726                 smp_ops->give_timebase = smp_generic_give_timebase;
 727                 smp_ops->take_timebase = smp_generic_take_timebase;
 728                 printk(KERN_INFO "Processor timebase sync using software\n");
 729         }
 730
 731 #ifndef CONFIG_PPC64
 732         {
 733                 int i;
 734
 735                 /* XXX should get this from reg properties */
 736                 for (i = 1; i < ncpus; ++i)
 737                         smp_hw_index[i] = i;
 738         }
 739 #endif
 740
 741         /* 32 bits SMP can't NAP */
 742         if (!machine_is_compatible("MacRISC4"))
 743                 powersave_nap = 0;
 744 }
 745
 746 static int __init smp_core99_probe(void)
 747 {
 748         struct device_node *cpus;
 749         int ncpus = 0;
 750
 751         if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
 752
 753         /* Count CPUs in the device-tree */
 754         for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;)
 755                 ++ncpus;
 756
 757         printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus);
 758
 759         /* Nothing more to do if less than 2 of them */
 760         if (ncpus <= 1)
 761                 return 1;
 762
 763         /* We need to perform some early initialisations before we can start
 764          * setting up SMP as we are running before initcalls
 765          */
 766         pmac_pfunc_base_install();
 767         pmac_i2c_init();
 768
 769         /* Setup various bits like timebase sync method, ability to nap, ... */
 770         smp_core99_setup(ncpus);
 771
 772         /* Install IPIs */
 773         mpic_request_ipis();
 774
 775         /* Collect l2cr and l3cr values from CPU 0 */
 776         core99_init_caches(0);
 777
 778         return ncpus;
 779 }
 780
 781 static void __devinit smp_core99_kick_cpu(int nr)
 782 {
 783         unsigned int save_vector;
 784         unsigned long target, flags;
 785         volatile unsigned int *vector
 786                  = ((volatile unsigned int *)(KERNELBASE+0x100));
 787
 788         if (nr < 0 || nr > 3)
 789                 return;
 790
 791         if (ppc_md.progress)
 792                 ppc_md.progress("smp_core99_kick_cpu", 0x346);
 793
 794         local_irq_save(flags);
 795         local_irq_disable();
 796
 797         /* Save reset vector */
 798         save_vector = *vector;
 799
 800         /* Setup fake reset vector that does
 801          *   b __secondary_start_pmac_0 + nr*8 - KERNELBASE
 802          */
 803         target = (unsigned long) __secondary_start_pmac_0 + nr * 8;
 804         create_branch((unsigned long)vector, target, BRANCH_SET_LINK);
 805
 806         /* Put some life in our friend */
 807         pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
 808
 809         /* FIXME: We wait a bit for the CPU to take the exception, I should
 810          * instead wait for the entry code to set something for me. Well,
 811          * ideally, all that crap will be done in prom.c and the CPU left
 812          * in a RAM-based wait loop like CHRP.
 813          */
 814         mdelay(1);
 815
 816         /* Restore our exception vector */
 817         *vector = save_vector;
 818         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
 819
 820         local_irq_restore(flags);
 821         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
 822 }
 823
 824 static void __devinit smp_core99_setup_cpu(int cpu_nr)
 825 {
 826         /* Setup L2/L3 */
 827         if (cpu_nr != 0)
 828                 core99_init_caches(cpu_nr);
 829
 830         /* Setup openpic */
 831         mpic_setup_this_cpu();
 832
 833         if (cpu_nr == 0) {
 834 #ifdef CONFIG_PPC64
 835                 extern void g5_phy_disable_cpu1(void);
 836
 837                 /* Close i2c bus if it was used for tb sync */
 838                 if (pmac_tb_clock_chip_host) {
 839                         pmac_i2c_close(pmac_tb_clock_chip_host);
 840                         pmac_tb_clock_chip_host = NULL;
 841                 }
 842
 843                 /* If we didn't start the second CPU, we must take
 844                  * it off the bus
 845                  */
 846                 if (machine_is_compatible("MacRISC4") &&
 847                     num_online_cpus() < 2)
 848                         g5_phy_disable_cpu1();
 849 #endif /* CONFIG_PPC64 */
 850
 851                 if (ppc_md.progress)
 852                         ppc_md.progress("core99_setup_cpu 0 done", 0x349);
 853         }
 854 }
 855
 856
 857 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
 858
 859 int smp_core99_cpu_disable(void)
 860 {
 861         cpu_clear(smp_processor_id(), cpu_online_map);
 862
 863         /* XXX reset cpu affinity here */
 864         mpic_cpu_set_priority(0xf);
 865         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 866         mb();
 867         udelay(20);
 868         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 869         return 0;
 870 }
 871
 872 extern void low_cpu_die(void) __attribute__((noreturn)); /* in sleep.S */
 873 static int cpu_dead[NR_CPUS];
 874
 875 void cpu_die(void)
 876 {
 877         local_irq_disable();
 878         cpu_dead[smp_processor_id()] = 1;
 879         mb();
 880         low_cpu_die();
 881 }
 882
 883 void smp_core99_cpu_die(unsigned int cpu)
 884 {
 885         int timeout;
 886
 887         timeout = 1000;
 888         while (!cpu_dead[cpu]) {
 889                 if (--timeout == 0) {
 890                         printk("CPU %u refused to die!\n", cpu);
 891                         break;
 892                 }
 893                 msleep(1);
 894         }
 895         cpu_dead[cpu] = 0;
 896 }
 897
 898 #endif
 899
 900 /* Core99 Macs (dual G4s and G5s) */
 901 struct smp_ops_t core99_smp_ops = {
 902         .message_pass   = smp_mpic_message_pass,
 903         .probe          = smp_core99_probe,
 904         .kick_cpu       = smp_core99_kick_cpu,
 905         .setup_cpu      = smp_core99_setup_cpu,
 906         .give_timebase  = smp_core99_give_timebase,
 907         .take_timebase  = smp_core99_take_timebase,
 908 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
 909         .cpu_disable    = smp_core99_cpu_disable,
 910         .cpu_die        = smp_core99_cpu_die,
 911 #endif
 912 };