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/kernel.h>
  25 #include <linux/sched.h>
  26 #include <linux/smp.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/kernel_stat.h>
  29 #include <linux/delay.h>
  30 #include <linux/init.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/errno.h>
  33 #include <linux/hardirq.h>
  34 #include <linux/cpu.h>
  35 #include <linux/compiler.h>
  36
  37 #include <asm/ptrace.h>
  38 #include <asm/atomic.h>
  39 #include <asm/code-patching.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 #include <asm/pmac_pfunc.h>
  55
  56 #define DEBUG
  57
  58 #ifdef DEBUG
  59 #define DBG(fmt...) udbg_printf(fmt)
  60 #else
  61 #define DBG(fmt...)
  62 #endif
  63
  64 extern void __secondary_start_pmac_0(void);
  65 extern int pmac_pfunc_base_install(void);
  66
  67 #ifdef CONFIG_PPC32
  68
  69 /* Sync flag for HW tb sync */
  70 static volatile int sec_tb_reset = 0;
  71
  72 /*
  73  * Powersurge (old powermac SMP) support.
  74  */
  75
  76 /* Addresses for powersurge registers */
  77 #define HAMMERHEAD_BASE         0xf8000000
  78 #define HHEAD_CONFIG            0x90
  79 #define HHEAD_SEC_INTR          0xc0
  80
  81 /* register for interrupting the primary processor on the powersurge */
  82 /* N.B. this is actually the ethernet ROM! */
  83 #define PSURGE_PRI_INTR         0xf3019000
  84
  85 /* register for storing the start address for the secondary processor */
  86 /* N.B. this is the PCI config space address register for the 1st bridge */
  87 #define PSURGE_START            0xf2800000
  88
  89 /* Daystar/XLR8 4-CPU card */
  90 #define PSURGE_QUAD_REG_ADDR    0xf8800000
  91
  92 #define PSURGE_QUAD_IRQ_SET     0
  93 #define PSURGE_QUAD_IRQ_CLR     1
  94 #define PSURGE_QUAD_IRQ_PRIMARY 2
  95 #define PSURGE_QUAD_CKSTOP_CTL  3
  96 #define PSURGE_QUAD_PRIMARY_ARB 4
  97 #define PSURGE_QUAD_BOARD_ID    6
  98 #define PSURGE_QUAD_WHICH_CPU   7
  99 #define PSURGE_QUAD_CKSTOP_RDBK 8
 100 #define PSURGE_QUAD_RESET_CTL   11
 101
 102 #define PSURGE_QUAD_OUT(r, v)   (out_8(quad_base + ((r) << 4) + 4, (v)))
 103 #define PSURGE_QUAD_IN(r)       (in_8(quad_base + ((r) << 4) + 4) & 0x0f)
 104 #define PSURGE_QUAD_BIS(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) | (v)))
 105 #define PSURGE_QUAD_BIC(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) & ~(v)))
 106
 107 /* virtual addresses for the above */
 108 static volatile u8 __iomem *hhead_base;
 109 static volatile u8 __iomem *quad_base;
 110 static volatile u32 __iomem *psurge_pri_intr;
 111 static volatile u8 __iomem *psurge_sec_intr;
 112 static volatile u32 __iomem *psurge_start;
 113
 114 /* values for psurge_type */
 115 #define PSURGE_NONE             -1
 116 #define PSURGE_DUAL             0
 117 #define PSURGE_QUAD_OKEE        1
 118 #define PSURGE_QUAD_COTTON      2
 119 #define PSURGE_QUAD_ICEGRASS    3
 120
 121 /* what sort of powersurge board we have */
 122 static int psurge_type = PSURGE_NONE;
 123
 124 /*
 125  * Set and clear IPIs for powersurge.
 126  */
 127 static inline void psurge_set_ipi(int cpu)
 128 {
 129         if (psurge_type == PSURGE_NONE)
 130                 return;
 131         if (cpu == 0)
 132                 in_be32(psurge_pri_intr);
 133         else if (psurge_type == PSURGE_DUAL)
 134                 out_8(psurge_sec_intr, 0);
 135         else
 136                 PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_SET, 1 << cpu);
 137 }
 138
 139 static inline void psurge_clr_ipi(int cpu)
 140 {
 141         if (cpu > 0) {
 142                 switch(psurge_type) {
 143                 case PSURGE_DUAL:
 144                         out_8(psurge_sec_intr, ~0);
 145                 case PSURGE_NONE:
 146                         break;
 147                 default:
 148                         PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, 1 << cpu);
 149                 }
 150         }
 151 }
 152
 153 /*
 154  * On powersurge (old SMP powermac architecture) we don't have
 155  * separate IPIs for separate messages like openpic does.  Instead
 156  * we have a bitmap for each processor, where a 1 bit means that
 157  * the corresponding message is pending for that processor.
 158  * Ideally each cpu's entry would be in a different cache line.
 159  *  -- paulus.
 160  */
 161 static unsigned long psurge_smp_message[NR_CPUS];
 162
 163 void psurge_smp_message_recv(void)
 164 {
 165         int cpu = smp_processor_id();
 166         int msg;
 167
 168         /* clear interrupt */
 169         psurge_clr_ipi(cpu);
 170
 171         if (num_online_cpus() < 2)
 172                 return;
 173
 174         /* make sure there is a message there */
 175         for (msg = 0; msg < 4; msg++)
 176                 if (test_and_clear_bit(msg, &psurge_smp_message[cpu]))
 177                         smp_message_recv(msg);
 178 }
 179
 180 irqreturn_t psurge_primary_intr(int irq, void *d)
 181 {
 182         psurge_smp_message_recv();
 183         return IRQ_HANDLED;
 184 }
 185
 186 static void smp_psurge_message_pass(int target, int msg)
 187 {
 188         int i;
 189
 190         if (num_online_cpus() < 2)
 191                 return;
 192
 193         for_each_online_cpu(i) {
 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         struct device_node *dn;
 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         dn = of_find_node_by_name(NULL, "hammerhead");
 284         if (dn == NULL)
 285                 return 1;
 286         of_node_put(dn);
 287
 288         hhead_base = ioremap(HAMMERHEAD_BASE, 0x800);
 289         quad_base = ioremap(PSURGE_QUAD_REG_ADDR, 1024);
 290         psurge_sec_intr = hhead_base + HHEAD_SEC_INTR;
 291
 292         psurge_type = psurge_quad_probe();
 293         if (psurge_type != PSURGE_DUAL) {
 294                 psurge_quad_init();
 295                 /* All released cards using this HW design have 4 CPUs */
 296                 ncpus = 4;
 297         } else {
 298                 iounmap(quad_base);
 299                 if ((in_8(hhead_base + HHEAD_CONFIG) & 0x02) == 0) {
 300                         /* not a dual-cpu card */
 301                         iounmap(hhead_base);
 302                         psurge_type = PSURGE_NONE;
 303                         return 1;
 304                 }
 305                 ncpus = 2;
 306         }
 307
 308         psurge_start = ioremap(PSURGE_START, 4);
 309         psurge_pri_intr = ioremap(PSURGE_PRI_INTR, 4);
 310
 311         /*
 312          * This is necessary because OF doesn't know about the
 313          * secondary cpu(s), and thus there aren't nodes in the
 314          * device tree for them, and smp_setup_cpu_maps hasn't
 315          * set their bits in cpu_possible_map and cpu_present_map.
 316          */
 317         if (ncpus > NR_CPUS)
 318                 ncpus = NR_CPUS;
 319         for (i = 1; i < ncpus ; ++i) {
 320                 cpu_set(i, cpu_present_map);
 321                 set_hard_smp_processor_id(i, i);
 322         }
 323
 324         if (ppc_md.progress) ppc_md.progress("smp_psurge_probe - done", 0x352);
 325
 326         return ncpus;
 327 }
 328
 329 static void __init smp_psurge_kick_cpu(int nr)
 330 {
 331         unsigned long start = __pa(__secondary_start_pmac_0) + nr * 8;
 332         unsigned long a;
 333         int i;
 334
 335         /* may need to flush here if secondary bats aren't setup */
 336         for (a = KERNELBASE; a < KERNELBASE + 0x800000; a += 32)
 337                 asm volatile("dcbf 0,%0" : : "r" (a) : "memory");
 338         asm volatile("sync");
 339
 340         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu", 0x353);
 341
 342         out_be32(psurge_start, start);
 343         mb();
 344
 345         psurge_set_ipi(nr);
 346         /*
 347          * We can't use udelay here because the timebase is now frozen.
 348          */
 349         for (i = 0; i < 2000; ++i)
 350                 barrier();
 351         psurge_clr_ipi(nr);
 352
 353         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354);
 354 }
 355
 356 /*
 357  * With the dual-cpu powersurge board, the decrementers and timebases
 358  * of both cpus are frozen after the secondary cpu is started up,
 359  * until we give the secondary cpu another interrupt.  This routine
 360  * uses this to get the timebases synchronized.
 361  *  -- paulus.
 362  */
 363 static void __init psurge_dual_sync_tb(int cpu_nr)
 364 {
 365         int t;
 366
 367         set_dec(tb_ticks_per_jiffy);
 368         /* XXX fixme */
 369         set_tb(0, 0);
 370
 371         if (cpu_nr > 0) {
 372                 mb();
 373                 sec_tb_reset = 1;
 374                 return;
 375         }
 376
 377         /* wait for the secondary to have reset its TB before proceeding */
 378         for (t = 10000000; t > 0 && !sec_tb_reset; --t)
 379                 ;
 380
 381         /* now interrupt the secondary, starting both TBs */
 382         psurge_set_ipi(1);
 383 }
 384
 385 static struct irqaction psurge_irqaction = {
 386         .handler = psurge_primary_intr,
 387         .flags = IRQF_DISABLED,
 388         .mask = CPU_MASK_NONE,
 389         .name = "primary IPI",
 390 };
 391
 392 static void __init smp_psurge_setup_cpu(int cpu_nr)
 393 {
 394
 395         if (cpu_nr == 0) {
 396                 /* If we failed to start the second CPU, we should still
 397                  * send it an IPI to start the timebase & DEC or we might
 398                  * have them stuck.
 399                  */
 400                 if (num_online_cpus() < 2) {
 401                         if (psurge_type == PSURGE_DUAL)
 402                                 psurge_set_ipi(1);
 403                         return;
 404                 }
 405                 /* reset the entry point so if we get another intr we won't
 406                  * try to startup again */
 407                 out_be32(psurge_start, 0x100);
 408                 if (setup_irq(30, &psurge_irqaction))
 409                         printk(KERN_ERR "Couldn't get primary IPI interrupt");
 410         }
 411
 412         if (psurge_type == PSURGE_DUAL)
 413                 psurge_dual_sync_tb(cpu_nr);
 414 }
 415
 416 void __init smp_psurge_take_timebase(void)
 417 {
 418         /* Dummy implementation */
 419 }
 420
 421 void __init smp_psurge_give_timebase(void)
 422 {
 423         /* Dummy implementation */
 424 }
 425
 426 /* PowerSurge-style Macs */
 427 struct smp_ops_t psurge_smp_ops = {
 428         .message_pass   = smp_psurge_message_pass,
 429         .probe          = smp_psurge_probe,
 430         .kick_cpu       = smp_psurge_kick_cpu,
 431         .setup_cpu      = smp_psurge_setup_cpu,
 432         .give_timebase  = smp_psurge_give_timebase,
 433         .take_timebase  = smp_psurge_take_timebase,
 434 };
 435 #endif /* CONFIG_PPC32 - actually powersurge support */
 436
 437 /*
 438  * Core 99 and later support
 439  */
 440
 441 static void (*pmac_tb_freeze)(int freeze);
 442 static u64 timebase;
 443 static int tb_req;
 444
 445 static void smp_core99_give_timebase(void)
 446 {
 447         unsigned long flags;
 448
 449         local_irq_save(flags);
 450
 451         while(!tb_req)
 452                 barrier();
 453         tb_req = 0;
 454         (*pmac_tb_freeze)(1);
 455         mb();
 456         timebase = get_tb();
 457         mb();
 458         while (timebase)
 459                 barrier();
 460         mb();
 461         (*pmac_tb_freeze)(0);
 462         mb();
 463
 464         local_irq_restore(flags);
 465 }
 466
 467
 468 static void __devinit smp_core99_take_timebase(void)
 469 {
 470         unsigned long flags;
 471
 472         local_irq_save(flags);
 473
 474         tb_req = 1;
 475         mb();
 476         while (!timebase)
 477                 barrier();
 478         mb();
 479         set_tb(timebase >> 32, timebase & 0xffffffff);
 480         timebase = 0;
 481         mb();
 482         set_dec(tb_ticks_per_jiffy/2);
 483
 484         local_irq_restore(flags);
 485 }
 486
 487 #ifdef CONFIG_PPC64
 488 /*
 489  * G5s enable/disable the timebase via an i2c-connected clock chip.
 490  */
 491 static struct pmac_i2c_bus *pmac_tb_clock_chip_host;
 492 static u8 pmac_tb_pulsar_addr;
 493
 494 static void smp_core99_cypress_tb_freeze(int freeze)
 495 {
 496         u8 data;
 497         int rc;
 498
 499         /* Strangely, the device-tree says address is 0xd2, but darwin
 500          * accesses 0xd0 ...
 501          */
 502         pmac_i2c_setmode(pmac_tb_clock_chip_host,
 503                          pmac_i2c_mode_combined);
 504         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
 505                            0xd0 | pmac_i2c_read,
 506                            1, 0x81, &data, 1);
 507         if (rc != 0)
 508                 goto bail;
 509
 510         data = (data & 0xf3) | (freeze ? 0x00 : 0x0c);
 511
 512         pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
 513         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
 514                            0xd0 | pmac_i2c_write,
 515                            1, 0x81, &data, 1);
 516
 517  bail:
 518         if (rc != 0) {
 519                 printk("Cypress Timebase %s rc: %d\n",
 520                        freeze ? "freeze" : "unfreeze", rc);
 521                 panic("Timebase freeze failed !\n");
 522         }
 523 }
 524
 525
 526 static void smp_core99_pulsar_tb_freeze(int freeze)
 527 {
 528         u8 data;
 529         int rc;
 530
 531         pmac_i2c_setmode(pmac_tb_clock_chip_host,
 532                          pmac_i2c_mode_combined);
 533         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
 534                            pmac_tb_pulsar_addr | pmac_i2c_read,
 535                            1, 0x2e, &data, 1);
 536         if (rc != 0)
 537                 goto bail;
 538
 539         data = (data & 0x88) | (freeze ? 0x11 : 0x22);
 540
 541         pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
 542         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
 543                            pmac_tb_pulsar_addr | pmac_i2c_write,
 544                            1, 0x2e, &data, 1);
 545  bail:
 546         if (rc != 0) {
 547                 printk(KERN_ERR "Pulsar Timebase %s rc: %d\n",
 548                        freeze ? "freeze" : "unfreeze", rc);
 549                 panic("Timebase freeze failed !\n");
 550         }
 551 }
 552
 553 static void __init smp_core99_setup_i2c_hwsync(int ncpus)
 554 {
 555         struct device_node *cc = NULL;
 556         struct device_node *p;
 557         const char *name = NULL;
 558         const u32 *reg;
 559         int ok;
 560
 561         /* Look for the clock chip */
 562         while ((cc = of_find_node_by_name(cc, "i2c-hwclock")) != NULL) {
 563                 p = of_get_parent(cc);
 564                 ok = p && of_device_is_compatible(p, "uni-n-i2c");
 565                 of_node_put(p);
 566                 if (!ok)
 567                         continue;
 568
 569                 pmac_tb_clock_chip_host = pmac_i2c_find_bus(cc);
 570                 if (pmac_tb_clock_chip_host == NULL)
 571                         continue;
 572                 reg = of_get_property(cc, "reg", NULL);
 573                 if (reg == NULL)
 574                         continue;
 575                 switch (*reg) {
 576                 case 0xd2:
 577                         if (of_device_is_compatible(cc,"pulsar-legacy-slewing")) {
 578                                 pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
 579                                 pmac_tb_pulsar_addr = 0xd2;
 580                                 name = "Pulsar";
 581                         } else if (of_device_is_compatible(cc, "cy28508")) {
 582                                 pmac_tb_freeze = smp_core99_cypress_tb_freeze;
 583                                 name = "Cypress";
 584                         }
 585                         break;
 586                 case 0xd4:
 587                         pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
 588                         pmac_tb_pulsar_addr = 0xd4;
 589                         name = "Pulsar";
 590                         break;
 591                 }
 592                 if (pmac_tb_freeze != NULL)
 593                         break;
 594         }
 595         if (pmac_tb_freeze != NULL) {
 596                 /* Open i2c bus for synchronous access */
 597                 if (pmac_i2c_open(pmac_tb_clock_chip_host, 1)) {
 598                         printk(KERN_ERR "Failed top open i2c bus for clock"
 599                                " sync, fallback to software sync !\n");
 600                         goto no_i2c_sync;
 601                 }
 602                 printk(KERN_INFO "Processor timebase sync using %s i2c clock\n",
 603                        name);
 604                 return;
 605         }
 606  no_i2c_sync:
 607         pmac_tb_freeze = NULL;
 608         pmac_tb_clock_chip_host = NULL;
 609 }
 610
 611
 612
 613 /*
 614  * Newer G5s uses a platform function
 615  */
 616
 617 static void smp_core99_pfunc_tb_freeze(int freeze)
 618 {
 619         struct device_node *cpus;
 620         struct pmf_args args;
 621
 622         cpus = of_find_node_by_path("/cpus");
 623         BUG_ON(cpus == NULL);
 624         args.count = 1;
 625         args.u[0].v = !freeze;
 626         pmf_call_function(cpus, "cpu-timebase", &args);
 627         of_node_put(cpus);
 628 }
 629
 630 #else /* CONFIG_PPC64 */
 631
 632 /*
 633  * SMP G4 use a GPIO to enable/disable the timebase.
 634  */
 635
 636 static unsigned int core99_tb_gpio;     /* Timebase freeze GPIO */
 637
 638 static void smp_core99_gpio_tb_freeze(int freeze)
 639 {
 640         if (freeze)
 641                 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4);
 642         else
 643                 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0);
 644         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
 645 }
 646
 647
 648 #endif /* !CONFIG_PPC64 */
 649
 650 /* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */
 651 volatile static long int core99_l2_cache;
 652 volatile static long int core99_l3_cache;
 653
 654 static void __devinit core99_init_caches(int cpu)
 655 {
 656 #ifndef CONFIG_PPC64
 657         if (!cpu_has_feature(CPU_FTR_L2CR))
 658                 return;
 659
 660         if (cpu == 0) {
 661                 core99_l2_cache = _get_L2CR();
 662                 printk("CPU0: L2CR is %lx\n", core99_l2_cache);
 663         } else {
 664                 printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
 665                 _set_L2CR(0);
 666                 _set_L2CR(core99_l2_cache);
 667                 printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
 668         }
 669
 670         if (!cpu_has_feature(CPU_FTR_L3CR))
 671                 return;
 672
 673         if (cpu == 0){
 674                 core99_l3_cache = _get_L3CR();
 675                 printk("CPU0: L3CR is %lx\n", core99_l3_cache);
 676         } else {
 677                 printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
 678                 _set_L3CR(0);
 679                 _set_L3CR(core99_l3_cache);
 680                 printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
 681         }
 682 #endif /* !CONFIG_PPC64 */
 683 }
 684
 685 static void __init smp_core99_setup(int ncpus)
 686 {
 687 #ifdef CONFIG_PPC64
 688
 689         /* i2c based HW sync on some G5s */
 690         if (machine_is_compatible("PowerMac7,2") ||
 691             machine_is_compatible("PowerMac7,3") ||
 692             machine_is_compatible("RackMac3,1"))
 693                 smp_core99_setup_i2c_hwsync(ncpus);
 694
 695         /* pfunc based HW sync on recent G5s */
 696         if (pmac_tb_freeze == NULL) {
 697                 struct device_node *cpus =
 698                         of_find_node_by_path("/cpus");
 699                 if (cpus &&
 700                     of_get_property(cpus, "platform-cpu-timebase", NULL)) {
 701                         pmac_tb_freeze = smp_core99_pfunc_tb_freeze;
 702                         printk(KERN_INFO "Processor timebase sync using"
 703                                " platform function\n");
 704                 }
 705         }
 706
 707 #else /* CONFIG_PPC64 */
 708
 709         /* GPIO based HW sync on ppc32 Core99 */
 710         if (pmac_tb_freeze == NULL && !machine_is_compatible("MacRISC4")) {
 711                 struct device_node *cpu;
 712                 const u32 *tbprop = NULL;
 713
 714                 core99_tb_gpio = KL_GPIO_TB_ENABLE;     /* default value */
 715                 cpu = of_find_node_by_type(NULL, "cpu");
 716                 if (cpu != NULL) {
 717                         tbprop = of_get_property(cpu, "timebase-enable", NULL);
 718                         if (tbprop)
 719                                 core99_tb_gpio = *tbprop;
 720                         of_node_put(cpu);
 721                 }
 722                 pmac_tb_freeze = smp_core99_gpio_tb_freeze;
 723                 printk(KERN_INFO "Processor timebase sync using"
 724                        " GPIO 0x%02x\n", core99_tb_gpio);
 725         }
 726
 727 #endif /* CONFIG_PPC64 */
 728
 729         /* No timebase sync, fallback to software */
 730         if (pmac_tb_freeze == NULL) {
 731                 smp_ops->give_timebase = smp_generic_give_timebase;
 732                 smp_ops->take_timebase = smp_generic_take_timebase;
 733                 printk(KERN_INFO "Processor timebase sync using software\n");
 734         }
 735
 736 #ifndef CONFIG_PPC64
 737         {
 738                 int i;
 739
 740                 /* XXX should get this from reg properties */
 741                 for (i = 1; i < ncpus; ++i)
 742                         set_hard_smp_processor_id(i, i);
 743         }
 744 #endif
 745
 746         /* 32 bits SMP can't NAP */
 747         if (!machine_is_compatible("MacRISC4"))
 748                 powersave_nap = 0;
 749 }
 750
 751 static int __init smp_core99_probe(void)
 752 {
 753         struct device_node *cpus;
 754         int ncpus = 0;
 755
 756         if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
 757
 758         /* Count CPUs in the device-tree */
 759         for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;)
 760                 ++ncpus;
 761
 762         printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus);
 763
 764         /* Nothing more to do if less than 2 of them */
 765         if (ncpus <= 1)
 766                 return 1;
 767
 768         /* We need to perform some early initialisations before we can start
 769          * setting up SMP as we are running before initcalls
 770          */
 771         pmac_pfunc_base_install();
 772         pmac_i2c_init();
 773
 774         /* Setup various bits like timebase sync method, ability to nap, ... */
 775         smp_core99_setup(ncpus);
 776
 777         /* Install IPIs */
 778         mpic_request_ipis();
 779
 780         /* Collect l2cr and l3cr values from CPU 0 */
 781         core99_init_caches(0);
 782
 783         return ncpus;
 784 }
 785
 786 static void __devinit smp_core99_kick_cpu(int nr)
 787 {
 788         unsigned int save_vector;
 789         unsigned long target, flags;
 790         unsigned int *vector = (unsigned int *)(PAGE_OFFSET+0x100);
 791
 792         if (nr < 0 || nr > 3)
 793                 return;
 794
 795         if (ppc_md.progress)
 796                 ppc_md.progress("smp_core99_kick_cpu", 0x346);
 797
 798         local_irq_save(flags);
 799
 800         /* Save reset vector */
 801         save_vector = *vector;
 802
 803         /* Setup fake reset vector that does
 804          *   b __secondary_start_pmac_0 + nr*8
 805          */
 806         target = (unsigned long) __secondary_start_pmac_0 + nr * 8;
 807         patch_branch(vector, target, BRANCH_SET_LINK);
 808
 809         /* Put some life in our friend */
 810         pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
 811
 812         /* FIXME: We wait a bit for the CPU to take the exception, I should
 813          * instead wait for the entry code to set something for me. Well,
 814          * ideally, all that crap will be done in prom.c and the CPU left
 815          * in a RAM-based wait loop like CHRP.
 816          */
 817         mdelay(1);
 818
 819         /* Restore our exception vector */
 820         *vector = save_vector;
 821         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
 822
 823         local_irq_restore(flags);
 824         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
 825 }
 826
 827 static void __devinit smp_core99_setup_cpu(int cpu_nr)
 828 {
 829         /* Setup L2/L3 */
 830         if (cpu_nr != 0)
 831                 core99_init_caches(cpu_nr);
 832
 833         /* Setup openpic */
 834         mpic_setup_this_cpu();
 835
 836         if (cpu_nr == 0) {
 837 #ifdef CONFIG_PPC64
 838                 extern void g5_phy_disable_cpu1(void);
 839
 840                 /* Close i2c bus if it was used for tb sync */
 841                 if (pmac_tb_clock_chip_host) {
 842                         pmac_i2c_close(pmac_tb_clock_chip_host);
 843                         pmac_tb_clock_chip_host = NULL;
 844                 }
 845
 846                 /* If we didn't start the second CPU, we must take
 847                  * it off the bus
 848                  */
 849                 if (machine_is_compatible("MacRISC4") &&
 850                     num_online_cpus() < 2)
 851                         g5_phy_disable_cpu1();
 852 #endif /* CONFIG_PPC64 */
 853
 854                 if (ppc_md.progress)
 855                         ppc_md.progress("core99_setup_cpu 0 done", 0x349);
 856         }
 857 }
 858
 859
 860 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
 861
 862 int smp_core99_cpu_disable(void)
 863 {
 864         cpu_clear(smp_processor_id(), cpu_online_map);
 865
 866         /* XXX reset cpu affinity here */
 867         mpic_cpu_set_priority(0xf);
 868         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 869         mb();
 870         udelay(20);
 871         asm volatile("mtdec %0" : : "r" (0x7fffffff));
 872         return 0;
 873 }
 874
 875 extern void low_cpu_die(void) __attribute__((noreturn)); /* in sleep.S */
 876 static int cpu_dead[NR_CPUS];
 877
 878 void cpu_die(void)
 879 {
 880         local_irq_disable();
 881         cpu_dead[smp_processor_id()] = 1;
 882         mb();
 883         low_cpu_die();
 884 }
 885
 886 void smp_core99_cpu_die(unsigned int cpu)
 887 {
 888         int timeout;
 889
 890         timeout = 1000;
 891         while (!cpu_dead[cpu]) {
 892                 if (--timeout == 0) {
 893                         printk("CPU %u refused to die!\n", cpu);
 894                         break;
 895                 }
 896                 msleep(1);
 897         }
 898         cpu_dead[cpu] = 0;
 899 }
 900
 901 #endif /* CONFIG_HOTPLUG_CPU && CONFIG_PP32 */
 902
 903 /* Core99 Macs (dual G4s and G5s) */
 904 struct smp_ops_t core99_smp_ops = {
 905         .message_pass   = smp_mpic_message_pass,
 906         .probe          = smp_core99_probe,
 907         .kick_cpu       = smp_core99_kick_cpu,
 908         .setup_cpu      = smp_core99_setup_cpu,
 909         .give_timebase  = smp_core99_give_timebase,
 910         .take_timebase  = smp_core99_take_timebase,
 911 #if defined(CONFIG_HOTPLUG_CPU)
 912 # if defined(CONFIG_PPC32)
 913         .cpu_disable    = smp_core99_cpu_disable,
 914         .cpu_die        = smp_core99_cpu_die,
 915 # endif
 916 # if defined(CONFIG_PPC64)
 917         .cpu_disable    = generic_cpu_disable,
 918         .cpu_die        = generic_cpu_die,
 919         /* intentionally do *NOT* assign cpu_enable,
 920          * the generic code will use kick_cpu then! */
 921 # endif
 922 #endif
 923 };