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/smp_lock.h> 28 #include <linux/interrupt.h> 29 #include <linux/kernel_stat.h> 30 #include <linux/delay.h> 31 #include <linux/init.h> 32 #include <linux/spinlock.h> 33 #include <linux/errno.h> 34 #include <linux/hardirq.h> 35 #include <linux/cpu.h> 36 #include <linux/compiler.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 #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; 267 268 /* 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 int i; 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 /* 345 * We can't use udelay here because the timebase is now frozen. 346 */ 347 for (i = 0; i < 2000; ++i) 348 barrier(); 349 psurge_clr_ipi(nr); 350 351 if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354); 352 } 353 354 /* 355 * With the dual-cpu powersurge board, the decrementers and timebases 356 * of both cpus are frozen after the secondary cpu is started up, 357 * until we give the secondary cpu another interrupt. This routine 358 * uses this to get the timebases synchronized. 359 * -- paulus. 360 */ 361 static void __init psurge_dual_sync_tb(int cpu_nr) 362 { 363 int t; 364 365 set_dec(tb_ticks_per_jiffy); 366 /* XXX fixme */ 367 set_tb(0, 0); 368 369 if (cpu_nr > 0) { 370 mb(); 371 sec_tb_reset = 1; 372 return; 373 } 374 375 /* wait for the secondary to have reset its TB before proceeding */ 376 for (t = 10000000; t > 0 && !sec_tb_reset; --t) 377 ; 378 379 /* now interrupt the secondary, starting both TBs */ 380 psurge_set_ipi(1); 381 } 382 383 static struct irqaction psurge_irqaction = { 384 .handler = psurge_primary_intr, 385 .flags = IRQF_DISABLED, 386 .mask = CPU_MASK_NONE, 387 .name = "primary IPI", 388 }; 389 390 static void __init smp_psurge_setup_cpu(int cpu_nr) 391 { 392 393 if (cpu_nr == 0) { 394 /* If we failed to start the second CPU, we should still 395 * send it an IPI to start the timebase & DEC or we might 396 * have them stuck. 397 */ 398 if (num_online_cpus() < 2) { 399 if (psurge_type == PSURGE_DUAL) 400 psurge_set_ipi(1); 401 return; 402 } 403 /* reset the entry point so if we get another intr we won't 404 * try to startup again */ 405 out_be32(psurge_start, 0x100); 406 if (setup_irq(30, &psurge_irqaction)) 407 printk(KERN_ERR "Couldn't get primary IPI interrupt"); 408 } 409 410 if (psurge_type == PSURGE_DUAL) 411 psurge_dual_sync_tb(cpu_nr); 412 } 413 414 void __init smp_psurge_take_timebase(void) 415 { 416 /* Dummy implementation */ 417 } 418 419 void __init smp_psurge_give_timebase(void) 420 { 421 /* Dummy implementation */ 422 } 423 424 /* PowerSurge-style Macs */ 425 struct smp_ops_t psurge_smp_ops = { 426 .message_pass = smp_psurge_message_pass, 427 .probe = smp_psurge_probe, 428 .kick_cpu = smp_psurge_kick_cpu, 429 .setup_cpu = smp_psurge_setup_cpu, 430 .give_timebase = smp_psurge_give_timebase, 431 .take_timebase = smp_psurge_take_timebase, 432 }; 433 #endif /* CONFIG_PPC32 - actually powersurge support */ 434 435 /* 436 * Core 99 and later support 437 */ 438 439 static void (*pmac_tb_freeze)(int freeze); 440 static u64 timebase; 441 static int tb_req; 442 443 static void smp_core99_give_timebase(void) 444 { 445 unsigned long flags; 446 447 local_irq_save(flags); 448 449 while(!tb_req) 450 barrier(); 451 tb_req = 0; 452 (*pmac_tb_freeze)(1); 453 mb(); 454 timebase = get_tb(); 455 mb(); 456 while (timebase) 457 barrier(); 458 mb(); 459 (*pmac_tb_freeze)(0); 460 mb(); 461 462 local_irq_restore(flags); 463 } 464 465 466 static void __devinit smp_core99_take_timebase(void) 467 { 468 unsigned long flags; 469 470 local_irq_save(flags); 471 472 tb_req = 1; 473 mb(); 474 while (!timebase) 475 barrier(); 476 mb(); 477 set_tb(timebase >> 32, timebase & 0xffffffff); 478 timebase = 0; 479 mb(); 480 set_dec(tb_ticks_per_jiffy/2); 481 482 local_irq_restore(flags); 483 } 484 485 #ifdef CONFIG_PPC64 486 /* 487 * G5s enable/disable the timebase via an i2c-connected clock chip. 488 */ 489 static struct pmac_i2c_bus *pmac_tb_clock_chip_host; 490 static u8 pmac_tb_pulsar_addr; 491 492 static void smp_core99_cypress_tb_freeze(int freeze) 493 { 494 u8 data; 495 int rc; 496 497 /* Strangely, the device-tree says address is 0xd2, but darwin 498 * accesses 0xd0 ... 499 */ 500 pmac_i2c_setmode(pmac_tb_clock_chip_host, 501 pmac_i2c_mode_combined); 502 rc = pmac_i2c_xfer(pmac_tb_clock_chip_host, 503 0xd0 | pmac_i2c_read, 504 1, 0x81, &data, 1); 505 if (rc != 0) 506 goto bail; 507 508 data = (data & 0xf3) | (freeze ? 0x00 : 0x0c); 509 510 pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub); 511 rc = pmac_i2c_xfer(pmac_tb_clock_chip_host, 512 0xd0 | pmac_i2c_write, 513 1, 0x81, &data, 1); 514 515 bail: 516 if (rc != 0) { 517 printk("Cypress Timebase %s rc: %d\n", 518 freeze ? "freeze" : "unfreeze", rc); 519 panic("Timebase freeze failed !\n"); 520 } 521 } 522 523 524 static void smp_core99_pulsar_tb_freeze(int freeze) 525 { 526 u8 data; 527 int rc; 528 529 pmac_i2c_setmode(pmac_tb_clock_chip_host, 530 pmac_i2c_mode_combined); 531 rc = pmac_i2c_xfer(pmac_tb_clock_chip_host, 532 pmac_tb_pulsar_addr | pmac_i2c_read, 533 1, 0x2e, &data, 1); 534 if (rc != 0) 535 goto bail; 536 537 data = (data & 0x88) | (freeze ? 0x11 : 0x22); 538 539 pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub); 540 rc = pmac_i2c_xfer(pmac_tb_clock_chip_host, 541 pmac_tb_pulsar_addr | pmac_i2c_write, 542 1, 0x2e, &data, 1); 543 bail: 544 if (rc != 0) { 545 printk(KERN_ERR "Pulsar Timebase %s rc: %d\n", 546 freeze ? "freeze" : "unfreeze", rc); 547 panic("Timebase freeze failed !\n"); 548 } 549 } 550 551 static void __init smp_core99_setup_i2c_hwsync(int ncpus) 552 { 553 struct device_node *cc = NULL; 554 struct device_node *p; 555 const char *name = NULL; 556 const u32 *reg; 557 int ok; 558 559 /* Look for the clock chip */ 560 while ((cc = of_find_node_by_name(cc, "i2c-hwclock")) != NULL) { 561 p = of_get_parent(cc); 562 ok = p && device_is_compatible(p, "uni-n-i2c"); 563 of_node_put(p); 564 if (!ok) 565 continue; 566 567 pmac_tb_clock_chip_host = pmac_i2c_find_bus(cc); 568 if (pmac_tb_clock_chip_host == NULL) 569 continue; 570 reg = get_property(cc, "reg", NULL); 571 if (reg == NULL) 572 continue; 573 switch (*reg) { 574 case 0xd2: 575 if (device_is_compatible(cc,"pulsar-legacy-slewing")) { 576 pmac_tb_freeze = smp_core99_pulsar_tb_freeze; 577 pmac_tb_pulsar_addr = 0xd2; 578 name = "Pulsar"; 579 } else if (device_is_compatible(cc, "cy28508")) { 580 pmac_tb_freeze = smp_core99_cypress_tb_freeze; 581 name = "Cypress"; 582 } 583 break; 584 case 0xd4: 585 pmac_tb_freeze = smp_core99_pulsar_tb_freeze; 586 pmac_tb_pulsar_addr = 0xd4; 587 name = "Pulsar"; 588 break; 589 } 590 if (pmac_tb_freeze != NULL) 591 break; 592 } 593 if (pmac_tb_freeze != NULL) { 594 /* Open i2c bus for synchronous access */ 595 if (pmac_i2c_open(pmac_tb_clock_chip_host, 1)) { 596 printk(KERN_ERR "Failed top open i2c bus for clock" 597 " sync, fallback to software sync !\n"); 598 goto no_i2c_sync; 599 } 600 printk(KERN_INFO "Processor timebase sync using %s i2c clock\n", 601 name); 602 return; 603 } 604 no_i2c_sync: 605 pmac_tb_freeze = NULL; 606 pmac_tb_clock_chip_host = NULL; 607 } 608 609 610 611 /* 612 * Newer G5s uses a platform function 613 */ 614 615 static void smp_core99_pfunc_tb_freeze(int freeze) 616 { 617 struct device_node *cpus; 618 struct pmf_args args; 619 620 cpus = of_find_node_by_path("/cpus"); 621 BUG_ON(cpus == NULL); 622 args.count = 1; 623 args.u[0].v = !freeze; 624 pmf_call_function(cpus, "cpu-timebase", &args); 625 of_node_put(cpus); 626 } 627 628 #else /* CONFIG_PPC64 */ 629 630 /* 631 * SMP G4 use a GPIO to enable/disable the timebase. 632 */ 633 634 static unsigned int core99_tb_gpio; /* Timebase freeze GPIO */ 635 636 static void smp_core99_gpio_tb_freeze(int freeze) 637 { 638 if (freeze) 639 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4); 640 else 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 } 644 645 646 #endif /* !CONFIG_PPC64 */ 647 648 /* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */ 649 volatile static long int core99_l2_cache; 650 volatile static long int core99_l3_cache; 651 652 static void __devinit core99_init_caches(int cpu) 653 { 654 #ifndef CONFIG_PPC64 655 if (!cpu_has_feature(CPU_FTR_L2CR)) 656 return; 657 658 if (cpu == 0) { 659 core99_l2_cache = _get_L2CR(); 660 printk("CPU0: L2CR is %lx\n", core99_l2_cache); 661 } else { 662 printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR()); 663 _set_L2CR(0); 664 _set_L2CR(core99_l2_cache); 665 printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache); 666 } 667 668 if (!cpu_has_feature(CPU_FTR_L3CR)) 669 return; 670 671 if (cpu == 0){ 672 core99_l3_cache = _get_L3CR(); 673 printk("CPU0: L3CR is %lx\n", core99_l3_cache); 674 } else { 675 printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR()); 676 _set_L3CR(0); 677 _set_L3CR(core99_l3_cache); 678 printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache); 679 } 680 #endif /* !CONFIG_PPC64 */ 681 } 682 683 static void __init smp_core99_setup(int ncpus) 684 { 685 #ifdef CONFIG_PPC64 686 687 /* i2c based HW sync on some G5s */ 688 if (machine_is_compatible("PowerMac7,2") || 689 machine_is_compatible("PowerMac7,3") || 690 machine_is_compatible("RackMac3,1")) 691 smp_core99_setup_i2c_hwsync(ncpus); 692 693 /* pfunc based HW sync on recent G5s */ 694 if (pmac_tb_freeze == NULL) { 695 struct device_node *cpus = 696 of_find_node_by_path("/cpus"); 697 if (cpus && 698 get_property(cpus, "platform-cpu-timebase", NULL)) { 699 pmac_tb_freeze = smp_core99_pfunc_tb_freeze; 700 printk(KERN_INFO "Processor timebase sync using" 701 " platform function\n"); 702 } 703 } 704 705 #else /* CONFIG_PPC64 */ 706 707 /* GPIO based HW sync on ppc32 Core99 */ 708 if (pmac_tb_freeze == NULL && !machine_is_compatible("MacRISC4")) { 709 struct device_node *cpu; 710 const u32 *tbprop = NULL; 711 712 core99_tb_gpio = KL_GPIO_TB_ENABLE; /* default value */ 713 cpu = of_find_node_by_type(NULL, "cpu"); 714 if (cpu != NULL) { 715 tbprop = get_property(cpu, "timebase-enable", NULL); 716 if (tbprop) 717 core99_tb_gpio = *tbprop; 718 of_node_put(cpu); 719 } 720 pmac_tb_freeze = smp_core99_gpio_tb_freeze; 721 printk(KERN_INFO "Processor timebase sync using" 722 " GPIO 0x%02x\n", core99_tb_gpio); 723 } 724 725 #endif /* CONFIG_PPC64 */ 726 727 /* No timebase sync, fallback to software */ 728 if (pmac_tb_freeze == NULL) { 729 smp_ops->give_timebase = smp_generic_give_timebase; 730 smp_ops->take_timebase = smp_generic_take_timebase; 731 printk(KERN_INFO "Processor timebase sync using software\n"); 732 } 733 734 #ifndef CONFIG_PPC64 735 { 736 int i; 737 738 /* XXX should get this from reg properties */ 739 for (i = 1; i < ncpus; ++i) 740 smp_hw_index[i] = i; 741 } 742 #endif 743 744 /* 32 bits SMP can't NAP */ 745 if (!machine_is_compatible("MacRISC4")) 746 powersave_nap = 0; 747 } 748 749 static int __init smp_core99_probe(void) 750 { 751 struct device_node *cpus; 752 int ncpus = 0; 753 754 if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345); 755 756 /* Count CPUs in the device-tree */ 757 for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;) 758 ++ncpus; 759 760 printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus); 761 762 /* Nothing more to do if less than 2 of them */ 763 if (ncpus <= 1) 764 return 1; 765 766 /* We need to perform some early initialisations before we can start 767 * setting up SMP as we are running before initcalls 768 */ 769 pmac_pfunc_base_install(); 770 pmac_i2c_init(); 771 772 /* Setup various bits like timebase sync method, ability to nap, ... */ 773 smp_core99_setup(ncpus); 774 775 /* Install IPIs */ 776 mpic_request_ipis(); 777 778 /* Collect l2cr and l3cr values from CPU 0 */ 779 core99_init_caches(0); 780 781 return ncpus; 782 } 783 784 static void __devinit smp_core99_kick_cpu(int nr) 785 { 786 unsigned int save_vector; 787 unsigned long target, flags; 788 volatile unsigned int *vector 789 = ((volatile unsigned int *)(KERNELBASE+0x100)); 790 791 if (nr < 0 || nr > 3) 792 return; 793 794 if (ppc_md.progress) 795 ppc_md.progress("smp_core99_kick_cpu", 0x346); 796 797 local_irq_save(flags); 798 799 /* Save reset vector */ 800 save_vector = *vector; 801 802 /* Setup fake reset vector that does 803 * b __secondary_start_pmac_0 + nr*8 - KERNELBASE 804 */ 805 target = (unsigned long) __secondary_start_pmac_0 + nr * 8; 806 create_branch((unsigned long)vector, target, BRANCH_SET_LINK); 807 808 /* Put some life in our friend */ 809 pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0); 810 811 /* FIXME: We wait a bit for the CPU to take the exception, I should 812 * instead wait for the entry code to set something for me. Well, 813 * ideally, all that crap will be done in prom.c and the CPU left 814 * in a RAM-based wait loop like CHRP. 815 */ 816 mdelay(1); 817 818 /* Restore our exception vector */ 819 *vector = save_vector; 820 flush_icache_range((unsigned long) vector, (unsigned long) vector + 4); 821 822 local_irq_restore(flags); 823 if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347); 824 } 825 826 static void __devinit smp_core99_setup_cpu(int cpu_nr) 827 { 828 /* Setup L2/L3 */ 829 if (cpu_nr != 0) 830 core99_init_caches(cpu_nr); 831 832 /* Setup openpic */ 833 mpic_setup_this_cpu(); 834 835 if (cpu_nr == 0) { 836 #ifdef CONFIG_PPC64 837 extern void g5_phy_disable_cpu1(void); 838 839 /* Close i2c bus if it was used for tb sync */ 840 if (pmac_tb_clock_chip_host) { 841 pmac_i2c_close(pmac_tb_clock_chip_host); 842 pmac_tb_clock_chip_host = NULL; 843 } 844 845 /* If we didn't start the second CPU, we must take 846 * it off the bus 847 */ 848 if (machine_is_compatible("MacRISC4") && 849 num_online_cpus() < 2) 850 g5_phy_disable_cpu1(); 851 #endif /* CONFIG_PPC64 */ 852 853 if (ppc_md.progress) 854 ppc_md.progress("core99_setup_cpu 0 done", 0x349); 855 } 856 } 857 858 859 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32) 860 861 int smp_core99_cpu_disable(void) 862 { 863 cpu_clear(smp_processor_id(), cpu_online_map); 864 865 /* XXX reset cpu affinity here */ 866 mpic_cpu_set_priority(0xf); 867 asm volatile("mtdec %0" : : "r" (0x7fffffff)); 868 mb(); 869 udelay(20); 870 asm volatile("mtdec %0" : : "r" (0x7fffffff)); 871 return 0; 872 } 873 874 extern void low_cpu_die(void) __attribute__((noreturn)); /* in sleep.S */ 875 static int cpu_dead[NR_CPUS]; 876 877 void cpu_die(void) 878 { 879 local_irq_disable(); 880 cpu_dead[smp_processor_id()] = 1; 881 mb(); 882 low_cpu_die(); 883 } 884 885 void smp_core99_cpu_die(unsigned int cpu) 886 { 887 int timeout; 888 889 timeout = 1000; 890 while (!cpu_dead[cpu]) { 891 if (--timeout == 0) { 892 printk("CPU %u refused to die!\n", cpu); 893 break; 894 } 895 msleep(1); 896 } 897 cpu_dead[cpu] = 0; 898 } 899 900 #endif 901 902 /* Core99 Macs (dual G4s and G5s) */ 903 struct smp_ops_t core99_smp_ops = { 904 .message_pass = smp_mpic_message_pass, 905 .probe = smp_core99_probe, 906 .kick_cpu = smp_core99_kick_cpu, 907 .setup_cpu = smp_core99_setup_cpu, 908 .give_timebase = smp_core99_give_timebase, 909 .take_timebase = smp_core99_take_timebase, 910 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32) 911 .cpu_disable = smp_core99_cpu_disable, 912 .cpu_die = smp_core99_cpu_die, 913 #endif 914 }; 915