/arch/powerpc/platforms/powermac/smp.c
C | 960 lines | 655 code | 151 blank | 154 comment | 141 complexity | 3108118daf0d6512f7e2b7a057cac110 MD5 | raw file
Possible License(s): CC-BY-SA-3.0, GPL-2.0, LGPL-2.0, AGPL-1.0
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#undef DEBUG
57
58#ifdef DEBUG
59#define DBG(fmt...) udbg_printf(fmt)
60#else
61#define DBG(fmt...)
62#endif
63
64extern void __secondary_start_pmac_0(void);
65extern int pmac_pfunc_base_install(void);
66
67static void (*pmac_tb_freeze)(int freeze);
68static u64 timebase;
69static int tb_req;
70
71#ifdef CONFIG_PPC32
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 */
109static volatile u8 __iomem *hhead_base;
110static volatile u8 __iomem *quad_base;
111static volatile u32 __iomem *psurge_pri_intr;
112static volatile u8 __iomem *psurge_sec_intr;
113static 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 */
123static int psurge_type = PSURGE_NONE;
124
125/*
126 * Set and clear IPIs for powersurge.
127 */
128static 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
140static 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 */
162static unsigned long psurge_smp_message[NR_CPUS];
163
164void psurge_smp_message_recv(void)
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);
179}
180
181irqreturn_t psurge_primary_intr(int irq, void *d)
182{
183 psurge_smp_message_recv();
184 return IRQ_HANDLED;
185}
186
187static 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 */
209static 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
241static 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
265static int __init smp_psurge_probe(void)
266{
267 int i, ncpus;
268 struct device_node *dn;
269
270 /* We don't do SMP on the PPC601 -- paulus */
271 if (PVR_VER(mfspr(SPRN_PVR)) == 1)
272 return 1;
273
274 /*
275 * The powersurge cpu board can be used in the generation
276 * of powermacs that have a socket for an upgradeable cpu card,
277 * including the 7500, 8500, 9500, 9600.
278 * The device tree doesn't tell you if you have 2 cpus because
279 * OF doesn't know anything about the 2nd processor.
280 * Instead we look for magic bits in magic registers,
281 * in the hammerhead memory controller in the case of the
282 * dual-cpu powersurge board. -- paulus.
283 */
284 dn = of_find_node_by_name(NULL, "hammerhead");
285 if (dn == NULL)
286 return 1;
287 of_node_put(dn);
288
289 hhead_base = ioremap(HAMMERHEAD_BASE, 0x800);
290 quad_base = ioremap(PSURGE_QUAD_REG_ADDR, 1024);
291 psurge_sec_intr = hhead_base + HHEAD_SEC_INTR;
292
293 psurge_type = psurge_quad_probe();
294 if (psurge_type != PSURGE_DUAL) {
295 psurge_quad_init();
296 /* All released cards using this HW design have 4 CPUs */
297 ncpus = 4;
298 /* No sure how timebase sync works on those, let's use SW */
299 smp_ops->give_timebase = smp_generic_give_timebase;
300 smp_ops->take_timebase = smp_generic_take_timebase;
301 } else {
302 iounmap(quad_base);
303 if ((in_8(hhead_base + HHEAD_CONFIG) & 0x02) == 0) {
304 /* not a dual-cpu card */
305 iounmap(hhead_base);
306 psurge_type = PSURGE_NONE;
307 return 1;
308 }
309 ncpus = 2;
310 }
311
312 psurge_start = ioremap(PSURGE_START, 4);
313 psurge_pri_intr = ioremap(PSURGE_PRI_INTR, 4);
314
315 /* This is necessary because OF doesn't know about the
316 * secondary cpu(s), and thus there aren't nodes in the
317 * device tree for them, and smp_setup_cpu_maps hasn't
318 * set their bits in cpu_present_map.
319 */
320 if (ncpus > NR_CPUS)
321 ncpus = NR_CPUS;
322 for (i = 1; i < ncpus ; ++i)
323 set_cpu_present(i, true);
324
325 if (ppc_md.progress) ppc_md.progress("smp_psurge_probe - done", 0x352);
326
327 return ncpus;
328}
329
330static void __init smp_psurge_kick_cpu(int nr)
331{
332 unsigned long start = __pa(__secondary_start_pmac_0) + nr * 8;
333 unsigned long a, flags;
334 int i, j;
335
336 /* Defining this here is evil ... but I prefer hiding that
337 * crap to avoid giving people ideas that they can do the
338 * same.
339 */
340 extern volatile unsigned int cpu_callin_map[NR_CPUS];
341
342 /* may need to flush here if secondary bats aren't setup */
343 for (a = KERNELBASE; a < KERNELBASE + 0x800000; a += 32)
344 asm volatile("dcbf 0,%0" : : "r" (a) : "memory");
345 asm volatile("sync");
346
347 if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu", 0x353);
348
349 /* This is going to freeze the timeebase, we disable interrupts */
350 local_irq_save(flags);
351
352 out_be32(psurge_start, start);
353 mb();
354
355 psurge_set_ipi(nr);
356
357 /*
358 * We can't use udelay here because the timebase is now frozen.
359 */
360 for (i = 0; i < 2000; ++i)
361 asm volatile("nop" : : : "memory");
362 psurge_clr_ipi(nr);
363
364 /*
365 * Also, because the timebase is frozen, we must not return to the
366 * caller which will try to do udelay's etc... Instead, we wait -here-
367 * for the CPU to callin.
368 */
369 for (i = 0; i < 100000 && !cpu_callin_map[nr]; ++i) {
370 for (j = 1; j < 10000; j++)
371 asm volatile("nop" : : : "memory");
372 asm volatile("sync" : : : "memory");
373 }
374 if (!cpu_callin_map[nr])
375 goto stuck;
376
377 /* And we do the TB sync here too for standard dual CPU cards */
378 if (psurge_type == PSURGE_DUAL) {
379 while(!tb_req)
380 barrier();
381 tb_req = 0;
382 mb();
383 timebase = get_tb();
384 mb();
385 while (timebase)
386 barrier();
387 mb();
388 }
389 stuck:
390 /* now interrupt the secondary, restarting both TBs */
391 if (psurge_type == PSURGE_DUAL)
392 psurge_set_ipi(1);
393
394 if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354);
395}
396
397static struct irqaction psurge_irqaction = {
398 .handler = psurge_primary_intr,
399 .flags = IRQF_DISABLED,
400 .name = "primary IPI",
401};
402
403static void __init smp_psurge_setup_cpu(int cpu_nr)
404{
405 if (cpu_nr != 0)
406 return;
407
408 /* reset the entry point so if we get another intr we won't
409 * try to startup again */
410 out_be32(psurge_start, 0x100);
411 if (setup_irq(irq_create_mapping(NULL, 30), &psurge_irqaction))
412 printk(KERN_ERR "Couldn't get primary IPI interrupt");
413}
414
415void __init smp_psurge_take_timebase(void)
416{
417 if (psurge_type != PSURGE_DUAL)
418 return;
419
420 tb_req = 1;
421 mb();
422 while (!timebase)
423 barrier();
424 mb();
425 set_tb(timebase >> 32, timebase & 0xffffffff);
426 timebase = 0;
427 mb();
428 set_dec(tb_ticks_per_jiffy/2);
429}
430
431void __init smp_psurge_give_timebase(void)
432{
433 /* Nothing to do here */
434}
435
436/* PowerSurge-style Macs */
437struct smp_ops_t psurge_smp_ops = {
438 .message_pass = smp_psurge_message_pass,
439 .probe = smp_psurge_probe,
440 .kick_cpu = smp_psurge_kick_cpu,
441 .setup_cpu = smp_psurge_setup_cpu,
442 .give_timebase = smp_psurge_give_timebase,
443 .take_timebase = smp_psurge_take_timebase,
444};
445#endif /* CONFIG_PPC32 - actually powersurge support */
446
447/*
448 * Core 99 and later support
449 */
450
451
452static void smp_core99_give_timebase(void)
453{
454 unsigned long flags;
455
456 local_irq_save(flags);
457
458 while(!tb_req)
459 barrier();
460 tb_req = 0;
461 (*pmac_tb_freeze)(1);
462 mb();
463 timebase = get_tb();
464 mb();
465 while (timebase)
466 barrier();
467 mb();
468 (*pmac_tb_freeze)(0);
469 mb();
470
471 local_irq_restore(flags);
472}
473
474
475static void __devinit smp_core99_take_timebase(void)
476{
477 unsigned long flags;
478
479 local_irq_save(flags);
480
481 tb_req = 1;
482 mb();
483 while (!timebase)
484 barrier();
485 mb();
486 set_tb(timebase >> 32, timebase & 0xffffffff);
487 timebase = 0;
488 mb();
489
490 local_irq_restore(flags);
491}
492
493#ifdef CONFIG_PPC64
494/*
495 * G5s enable/disable the timebase via an i2c-connected clock chip.
496 */
497static struct pmac_i2c_bus *pmac_tb_clock_chip_host;
498static u8 pmac_tb_pulsar_addr;
499
500static void smp_core99_cypress_tb_freeze(int freeze)
501{
502 u8 data;
503 int rc;
504
505 /* Strangely, the device-tree says address is 0xd2, but darwin
506 * accesses 0xd0 ...
507 */
508 pmac_i2c_setmode(pmac_tb_clock_chip_host,
509 pmac_i2c_mode_combined);
510 rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
511 0xd0 | pmac_i2c_read,
512 1, 0x81, &data, 1);
513 if (rc != 0)
514 goto bail;
515
516 data = (data & 0xf3) | (freeze ? 0x00 : 0x0c);
517
518 pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
519 rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
520 0xd0 | pmac_i2c_write,
521 1, 0x81, &data, 1);
522
523 bail:
524 if (rc != 0) {
525 printk("Cypress Timebase %s rc: %d\n",
526 freeze ? "freeze" : "unfreeze", rc);
527 panic("Timebase freeze failed !\n");
528 }
529}
530
531
532static void smp_core99_pulsar_tb_freeze(int freeze)
533{
534 u8 data;
535 int rc;
536
537 pmac_i2c_setmode(pmac_tb_clock_chip_host,
538 pmac_i2c_mode_combined);
539 rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
540 pmac_tb_pulsar_addr | pmac_i2c_read,
541 1, 0x2e, &data, 1);
542 if (rc != 0)
543 goto bail;
544
545 data = (data & 0x88) | (freeze ? 0x11 : 0x22);
546
547 pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
548 rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
549 pmac_tb_pulsar_addr | pmac_i2c_write,
550 1, 0x2e, &data, 1);
551 bail:
552 if (rc != 0) {
553 printk(KERN_ERR "Pulsar Timebase %s rc: %d\n",
554 freeze ? "freeze" : "unfreeze", rc);
555 panic("Timebase freeze failed !\n");
556 }
557}
558
559static void __init smp_core99_setup_i2c_hwsync(int ncpus)
560{
561 struct device_node *cc = NULL;
562 struct device_node *p;
563 const char *name = NULL;
564 const u32 *reg;
565 int ok;
566
567 /* Look for the clock chip */
568 while ((cc = of_find_node_by_name(cc, "i2c-hwclock")) != NULL) {
569 p = of_get_parent(cc);
570 ok = p && of_device_is_compatible(p, "uni-n-i2c");
571 of_node_put(p);
572 if (!ok)
573 continue;
574
575 pmac_tb_clock_chip_host = pmac_i2c_find_bus(cc);
576 if (pmac_tb_clock_chip_host == NULL)
577 continue;
578 reg = of_get_property(cc, "reg", NULL);
579 if (reg == NULL)
580 continue;
581 switch (*reg) {
582 case 0xd2:
583 if (of_device_is_compatible(cc,"pulsar-legacy-slewing")) {
584 pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
585 pmac_tb_pulsar_addr = 0xd2;
586 name = "Pulsar";
587 } else if (of_device_is_compatible(cc, "cy28508")) {
588 pmac_tb_freeze = smp_core99_cypress_tb_freeze;
589 name = "Cypress";
590 }
591 break;
592 case 0xd4:
593 pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
594 pmac_tb_pulsar_addr = 0xd4;
595 name = "Pulsar";
596 break;
597 }
598 if (pmac_tb_freeze != NULL)
599 break;
600 }
601 if (pmac_tb_freeze != NULL) {
602 /* Open i2c bus for synchronous access */
603 if (pmac_i2c_open(pmac_tb_clock_chip_host, 1)) {
604 printk(KERN_ERR "Failed top open i2c bus for clock"
605 " sync, fallback to software sync !\n");
606 goto no_i2c_sync;
607 }
608 printk(KERN_INFO "Processor timebase sync using %s i2c clock\n",
609 name);
610 return;
611 }
612 no_i2c_sync:
613 pmac_tb_freeze = NULL;
614 pmac_tb_clock_chip_host = NULL;
615}
616
617
618
619/*
620 * Newer G5s uses a platform function
621 */
622
623static void smp_core99_pfunc_tb_freeze(int freeze)
624{
625 struct device_node *cpus;
626 struct pmf_args args;
627
628 cpus = of_find_node_by_path("/cpus");
629 BUG_ON(cpus == NULL);
630 args.count = 1;
631 args.u[0].v = !freeze;
632 pmf_call_function(cpus, "cpu-timebase", &args);
633 of_node_put(cpus);
634}
635
636#else /* CONFIG_PPC64 */
637
638/*
639 * SMP G4 use a GPIO to enable/disable the timebase.
640 */
641
642static unsigned int core99_tb_gpio; /* Timebase freeze GPIO */
643
644static void smp_core99_gpio_tb_freeze(int freeze)
645{
646 if (freeze)
647 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4);
648 else
649 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0);
650 pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
651}
652
653
654#endif /* !CONFIG_PPC64 */
655
656/* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */
657volatile static long int core99_l2_cache;
658volatile static long int core99_l3_cache;
659
660static void __devinit core99_init_caches(int cpu)
661{
662#ifndef CONFIG_PPC64
663 if (!cpu_has_feature(CPU_FTR_L2CR))
664 return;
665
666 if (cpu == 0) {
667 core99_l2_cache = _get_L2CR();
668 printk("CPU0: L2CR is %lx\n", core99_l2_cache);
669 } else {
670 printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
671 _set_L2CR(0);
672 _set_L2CR(core99_l2_cache);
673 printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
674 }
675
676 if (!cpu_has_feature(CPU_FTR_L3CR))
677 return;
678
679 if (cpu == 0){
680 core99_l3_cache = _get_L3CR();
681 printk("CPU0: L3CR is %lx\n", core99_l3_cache);
682 } else {
683 printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
684 _set_L3CR(0);
685 _set_L3CR(core99_l3_cache);
686 printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
687 }
688#endif /* !CONFIG_PPC64 */
689}
690
691static void __init smp_core99_setup(int ncpus)
692{
693#ifdef CONFIG_PPC64
694
695 /* i2c based HW sync on some G5s */
696 if (of_machine_is_compatible("PowerMac7,2") ||
697 of_machine_is_compatible("PowerMac7,3") ||
698 of_machine_is_compatible("RackMac3,1"))
699 smp_core99_setup_i2c_hwsync(ncpus);
700
701 /* pfunc based HW sync on recent G5s */
702 if (pmac_tb_freeze == NULL) {
703 struct device_node *cpus =
704 of_find_node_by_path("/cpus");
705 if (cpus &&
706 of_get_property(cpus, "platform-cpu-timebase", NULL)) {
707 pmac_tb_freeze = smp_core99_pfunc_tb_freeze;
708 printk(KERN_INFO "Processor timebase sync using"
709 " platform function\n");
710 }
711 }
712
713#else /* CONFIG_PPC64 */
714
715 /* GPIO based HW sync on ppc32 Core99 */
716 if (pmac_tb_freeze == NULL && !of_machine_is_compatible("MacRISC4")) {
717 struct device_node *cpu;
718 const u32 *tbprop = NULL;
719
720 core99_tb_gpio = KL_GPIO_TB_ENABLE; /* default value */
721 cpu = of_find_node_by_type(NULL, "cpu");
722 if (cpu != NULL) {
723 tbprop = of_get_property(cpu, "timebase-enable", NULL);
724 if (tbprop)
725 core99_tb_gpio = *tbprop;
726 of_node_put(cpu);
727 }
728 pmac_tb_freeze = smp_core99_gpio_tb_freeze;
729 printk(KERN_INFO "Processor timebase sync using"
730 " GPIO 0x%02x\n", core99_tb_gpio);
731 }
732
733#endif /* CONFIG_PPC64 */
734
735 /* No timebase sync, fallback to software */
736 if (pmac_tb_freeze == NULL) {
737 smp_ops->give_timebase = smp_generic_give_timebase;
738 smp_ops->take_timebase = smp_generic_take_timebase;
739 printk(KERN_INFO "Processor timebase sync using software\n");
740 }
741
742#ifndef CONFIG_PPC64
743 {
744 int i;
745
746 /* XXX should get this from reg properties */
747 for (i = 1; i < ncpus; ++i)
748 set_hard_smp_processor_id(i, i);
749 }
750#endif
751
752 /* 32 bits SMP can't NAP */
753 if (!of_machine_is_compatible("MacRISC4"))
754 powersave_nap = 0;
755}
756
757static int __init smp_core99_probe(void)
758{
759 struct device_node *cpus;
760 int ncpus = 0;
761
762 if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
763
764 /* Count CPUs in the device-tree */
765 for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;)
766 ++ncpus;
767
768 printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus);
769
770 /* Nothing more to do if less than 2 of them */
771 if (ncpus <= 1)
772 return 1;
773
774 /* We need to perform some early initialisations before we can start
775 * setting up SMP as we are running before initcalls
776 */
777 pmac_pfunc_base_install();
778 pmac_i2c_init();
779
780 /* Setup various bits like timebase sync method, ability to nap, ... */
781 smp_core99_setup(ncpus);
782
783 /* Install IPIs */
784 mpic_request_ipis();
785
786 /* Collect l2cr and l3cr values from CPU 0 */
787 core99_init_caches(0);
788
789 return ncpus;
790}
791
792static void __devinit smp_core99_kick_cpu(int nr)
793{
794 unsigned int save_vector;
795 unsigned long target, flags;
796 unsigned int *vector = (unsigned int *)(PAGE_OFFSET+0x100);
797
798 if (nr < 0 || nr > 3)
799 return;
800
801 if (ppc_md.progress)
802 ppc_md.progress("smp_core99_kick_cpu", 0x346);
803
804 local_irq_save(flags);
805
806 /* Save reset vector */
807 save_vector = *vector;
808
809 /* Setup fake reset vector that does
810 * b __secondary_start_pmac_0 + nr*8
811 */
812 target = (unsigned long) __secondary_start_pmac_0 + nr * 8;
813 patch_branch(vector, target, BRANCH_SET_LINK);
814
815 /* Put some life in our friend */
816 pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
817
818 /* FIXME: We wait a bit for the CPU to take the exception, I should
819 * instead wait for the entry code to set something for me. Well,
820 * ideally, all that crap will be done in prom.c and the CPU left
821 * in a RAM-based wait loop like CHRP.
822 */
823 mdelay(1);
824
825 /* Restore our exception vector */
826 *vector = save_vector;
827 flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
828
829 local_irq_restore(flags);
830 if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
831}
832
833static void __devinit smp_core99_setup_cpu(int cpu_nr)
834{
835 /* Setup L2/L3 */
836 if (cpu_nr != 0)
837 core99_init_caches(cpu_nr);
838
839 /* Setup openpic */
840 mpic_setup_this_cpu();
841
842 if (cpu_nr == 0) {
843#ifdef CONFIG_PPC64
844 extern void g5_phy_disable_cpu1(void);
845
846 /* Close i2c bus if it was used for tb sync */
847 if (pmac_tb_clock_chip_host) {
848 pmac_i2c_close(pmac_tb_clock_chip_host);
849 pmac_tb_clock_chip_host = NULL;
850 }
851
852 /* If we didn't start the second CPU, we must take
853 * it off the bus
854 */
855 if (of_machine_is_compatible("MacRISC4") &&
856 num_online_cpus() < 2)
857 g5_phy_disable_cpu1();
858#endif /* CONFIG_PPC64 */
859
860 if (ppc_md.progress)
861 ppc_md.progress("core99_setup_cpu 0 done", 0x349);
862 }
863}
864
865
866#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
867
868int smp_core99_cpu_disable(void)
869{
870 set_cpu_online(smp_processor_id(), false);
871
872 /* XXX reset cpu affinity here */
873 mpic_cpu_set_priority(0xf);
874 asm volatile("mtdec %0" : : "r" (0x7fffffff));
875 mb();
876 udelay(20);
877 asm volatile("mtdec %0" : : "r" (0x7fffffff));
878 return 0;
879}
880
881extern void low_cpu_die(void) __attribute__((noreturn)); /* in sleep.S */
882static int cpu_dead[NR_CPUS];
883
884void cpu_die(void)
885{
886 local_irq_disable();
887 cpu_dead[smp_processor_id()] = 1;
888 mb();
889 low_cpu_die();
890}
891
892void smp_core99_cpu_die(unsigned int cpu)
893{
894 int timeout;
895
896 timeout = 1000;
897 while (!cpu_dead[cpu]) {
898 if (--timeout == 0) {
899 printk("CPU %u refused to die!\n", cpu);
900 break;
901 }
902 msleep(1);
903 }
904 cpu_dead[cpu] = 0;
905}
906
907#endif /* CONFIG_HOTPLUG_CPU && CONFIG_PP32 */
908
909/* Core99 Macs (dual G4s and G5s) */
910struct smp_ops_t core99_smp_ops = {
911 .message_pass = smp_mpic_message_pass,
912 .probe = smp_core99_probe,
913 .kick_cpu = smp_core99_kick_cpu,
914 .setup_cpu = smp_core99_setup_cpu,
915 .give_timebase = smp_core99_give_timebase,
916 .take_timebase = smp_core99_take_timebase,
917#if defined(CONFIG_HOTPLUG_CPU)
918# if defined(CONFIG_PPC32)
919 .cpu_disable = smp_core99_cpu_disable,
920 .cpu_die = smp_core99_cpu_die,
921# endif
922# if defined(CONFIG_PPC64)
923 .cpu_disable = generic_cpu_disable,
924 .cpu_die = generic_cpu_die,
925 /* intentionally do *NOT* assign cpu_enable,
926 * the generic code will use kick_cpu then! */
927# endif
928#endif
929};
930
931void __init pmac_setup_smp(void)
932{
933 struct device_node *np;
934
935 /* Check for Core99 */
936 np = of_find_node_by_name(NULL, "uni-n");
937 if (!np)
938 np = of_find_node_by_name(NULL, "u3");
939 if (!np)
940 np = of_find_node_by_name(NULL, "u4");
941 if (np) {
942 of_node_put(np);
943 smp_ops = &core99_smp_ops;
944 }
945#ifdef CONFIG_PPC32
946 else {
947 /* We have to set bits in cpu_possible_map here since the
948 * secondary CPU(s) aren't in the device tree. Various
949 * things won't be initialized for CPUs not in the possible
950 * map, so we really need to fix it up here.
951 */
952 int cpu;
953
954 for (cpu = 1; cpu < 4 && cpu < NR_CPUS; ++cpu)
955 set_cpu_possible(cpu, true);
956 smp_ops = &psurge_smp_ops;
957 }
958#endif /* CONFIG_PPC32 */
959}
960