df01bb8feb16d81ea756404bfb49a6dffff0a545
[linux-2.6.git] / 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
56 #undef 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
66 #ifdef CONFIG_PPC32
67
68 /* Sync flag for HW tb sync */
69 static volatile int sec_tb_reset = 0;
70
71 /*
72  * Powersurge (old powermac SMP) support.
73  */
74
75 /* Addresses for powersurge registers */
76 #define HAMMERHEAD_BASE         0xf8000000
77 #define HHEAD_CONFIG            0x90
78 #define HHEAD_SEC_INTR          0xc0
79
80 /* register for interrupting the primary processor on the powersurge */
81 /* N.B. this is actually the ethernet ROM! */
82 #define PSURGE_PRI_INTR         0xf3019000
83
84 /* register for storing the start address for the secondary processor */
85 /* N.B. this is the PCI config space address register for the 1st bridge */
86 #define PSURGE_START            0xf2800000
87
88 /* Daystar/XLR8 4-CPU card */
89 #define PSURGE_QUAD_REG_ADDR    0xf8800000
90
91 #define PSURGE_QUAD_IRQ_SET     0
92 #define PSURGE_QUAD_IRQ_CLR     1
93 #define PSURGE_QUAD_IRQ_PRIMARY 2
94 #define PSURGE_QUAD_CKSTOP_CTL  3
95 #define PSURGE_QUAD_PRIMARY_ARB 4
96 #define PSURGE_QUAD_BOARD_ID    6
97 #define PSURGE_QUAD_WHICH_CPU   7
98 #define PSURGE_QUAD_CKSTOP_RDBK 8
99 #define PSURGE_QUAD_RESET_CTL   11
100
101 #define PSURGE_QUAD_OUT(r, v)   (out_8(quad_base + ((r) << 4) + 4, (v)))
102 #define PSURGE_QUAD_IN(r)       (in_8(quad_base + ((r) << 4) + 4) & 0x0f)
103 #define PSURGE_QUAD_BIS(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) | (v)))
104 #define PSURGE_QUAD_BIC(r, v)   (PSURGE_QUAD_OUT((r), PSURGE_QUAD_IN(r) & ~(v)))
105
106 /* virtual addresses for the above */
107 static volatile u8 __iomem *hhead_base;
108 static volatile u8 __iomem *quad_base;
109 static volatile u32 __iomem *psurge_pri_intr;
110 static volatile u8 __iomem *psurge_sec_intr;
111 static volatile u32 __iomem *psurge_start;
112
113 /* values for psurge_type */
114 #define PSURGE_NONE             -1
115 #define PSURGE_DUAL             0
116 #define PSURGE_QUAD_OKEE        1
117 #define PSURGE_QUAD_COTTON      2
118 #define PSURGE_QUAD_ICEGRASS    3
119
120 /* what sort of powersurge board we have */
121 static int psurge_type = PSURGE_NONE;
122
123 /*
124  * Set and clear IPIs for powersurge.
125  */
126 static inline void psurge_set_ipi(int cpu)
127 {
128         if (psurge_type == PSURGE_NONE)
129                 return;
130         if (cpu == 0)
131                 in_be32(psurge_pri_intr);
132         else if (psurge_type == PSURGE_DUAL)
133                 out_8(psurge_sec_intr, 0);
134         else
135                 PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_SET, 1 << cpu);
136 }
137
138 static inline void psurge_clr_ipi(int cpu)
139 {
140         if (cpu > 0) {
141                 switch(psurge_type) {
142                 case PSURGE_DUAL:
143                         out_8(psurge_sec_intr, ~0);
144                 case PSURGE_NONE:
145                         break;
146                 default:
147                         PSURGE_QUAD_OUT(PSURGE_QUAD_IRQ_CLR, 1 << cpu);
148                 }
149         }
150 }
151
152 /*
153  * On powersurge (old SMP powermac architecture) we don't have
154  * separate IPIs for separate messages like openpic does.  Instead
155  * we have a bitmap for each processor, where a 1 bit means that
156  * the corresponding message is pending for that processor.
157  * Ideally each cpu's entry would be in a different cache line.
158  *  -- paulus.
159  */
160 static unsigned long psurge_smp_message[NR_CPUS];
161
162 void psurge_smp_message_recv(struct pt_regs *regs)
163 {
164         int cpu = smp_processor_id();
165         int msg;
166
167         /* clear interrupt */
168         psurge_clr_ipi(cpu);
169
170         if (num_online_cpus() < 2)
171                 return;
172
173         /* make sure there is a message there */
174         for (msg = 0; msg < 4; msg++)
175                 if (test_and_clear_bit(msg, &psurge_smp_message[cpu]))
176                         smp_message_recv(msg, regs);
177 }
178
179 irqreturn_t psurge_primary_intr(int irq, void *d, struct pt_regs *regs)
180 {
181         psurge_smp_message_recv(regs);
182         return IRQ_HANDLED;
183 }
184
185 static void smp_psurge_message_pass(int target, int msg)
186 {
187         int i;
188
189         if (num_online_cpus() < 2)
190                 return;
191
192         for (i = 0; i < NR_CPUS; i++) {
193                 if (!cpu_online(i))
194                         continue;
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 unsigned long 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 device_node *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_low_i2c_setmode(pmac_tb_clock_chip_host,
497                              pmac_low_i2c_mode_combined);
498         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
499                                0xd0 | pmac_low_i2c_read,
500                                0x81, &data, 1);
501         if (rc != 0)
502                 goto bail;
503
504         data = (data & 0xf3) | (freeze ? 0x00 : 0x0c);
505
506         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_stdsub);
507         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
508                                0xd0 | pmac_low_i2c_write,
509                                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_low_i2c_setmode(pmac_tb_clock_chip_host,
526                              pmac_low_i2c_mode_combined);
527         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
528                                pmac_tb_pulsar_addr | pmac_low_i2c_read,
529                                0x2e, &data, 1);
530         if (rc != 0)
531                 goto bail;
532
533         data = (data & 0x88) | (freeze ? 0x11 : 0x22);
534
535         pmac_low_i2c_setmode(pmac_tb_clock_chip_host, pmac_low_i2c_mode_stdsub);
536         rc = pmac_low_i2c_xfer(pmac_tb_clock_chip_host,
537                                pmac_tb_pulsar_addr | pmac_low_i2c_write,
538                                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                 reg = (u32 *)get_property(cc, "reg", NULL);
564                 if (reg == NULL)
565                         continue;
566
567                 switch (*reg) {
568                 case 0xd2:
569                         if (device_is_compatible(cc, "pulsar-legacy-slewing")) {
570                                 pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
571                                 pmac_tb_pulsar_addr = 0xd2;
572                                 name = "Pulsar";
573                         } else if (device_is_compatible(cc, "cy28508")) {
574                                 pmac_tb_freeze = smp_core99_cypress_tb_freeze;
575                                 name = "Cypress";
576                         }
577                         break;
578                 case 0xd4:
579                         pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
580                         pmac_tb_pulsar_addr = 0xd4;
581                         name = "Pulsar";
582                         break;
583                 }
584                 if (pmac_tb_freeze != NULL)
585                         break;
586         }
587         if (pmac_tb_freeze != NULL) {
588                 struct device_node *p = of_get_parent(cc);
589                 of_node_put(cc);
590                 while(p && strcmp(p->type, "i2c")) {
591                         cc = of_get_parent(p);
592                         of_node_put(p);
593                         p = cc;
594                 }
595                 if (p == NULL)
596                         goto no_i2c_sync;
597                 /* Open i2c bus for synchronous access */
598                 if (pmac_low_i2c_open(p, 0)) {
599                         printk(KERN_ERR "Failed top open i2c bus %s for clock"
600                                " sync, fallback to software sync !\n",
601                                p->full_name);
602                         of_node_put(p);
603                         goto no_i2c_sync;
604                 }
605                 pmac_tb_clock_chip_host = p;
606                 printk(KERN_INFO "Processor timebase sync using %s i2c clock\n",
607                        name);
608                 return;
609         }
610  no_i2c_sync:
611         pmac_tb_freeze = NULL;
612 }
613
614 #endif /* CONFIG_PPC64 */
615
616
617 /*
618  * SMP G4 and newer G5 use a GPIO to enable/disable the timebase.
619  */
620
621 static unsigned int core99_tb_gpio;     /* Timebase freeze GPIO */
622
623 static void smp_core99_gpio_tb_freeze(int freeze)
624 {
625         if (freeze)
626                 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4);
627         else
628                 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0);
629         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
630 }
631
632 /* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */
633 volatile static long int core99_l2_cache;
634 volatile static long int core99_l3_cache;
635
636 static void __devinit core99_init_caches(int cpu)
637 {
638 #ifndef CONFIG_PPC64
639         if (!cpu_has_feature(CPU_FTR_L2CR))
640                 return;
641
642         if (cpu == 0) {
643                 core99_l2_cache = _get_L2CR();
644                 printk("CPU0: L2CR is %lx\n", core99_l2_cache);
645         } else {
646                 printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
647                 _set_L2CR(0);
648                 _set_L2CR(core99_l2_cache);
649                 printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
650         }
651
652         if (!cpu_has_feature(CPU_FTR_L3CR))
653                 return;
654
655         if (cpu == 0){
656                 core99_l3_cache = _get_L3CR();
657                 printk("CPU0: L3CR is %lx\n", core99_l3_cache);
658         } else {
659                 printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
660                 _set_L3CR(0);
661                 _set_L3CR(core99_l3_cache);
662                 printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
663         }
664 #endif /* !CONFIG_PPC64 */
665 }
666
667 static void __init smp_core99_setup(int ncpus)
668 {
669 #ifdef CONFIG_PPC64
670
671         /* i2c based HW sync on some G5s */
672         if (machine_is_compatible("PowerMac7,2") ||
673             machine_is_compatible("PowerMac7,3") ||
674             machine_is_compatible("RackMac3,1"))
675                 smp_core99_setup_i2c_hwsync(ncpus);
676
677         /* GPIO based HW sync on recent G5s */
678         if (pmac_tb_freeze == NULL) {
679                 struct device_node *np =
680                         of_find_node_by_name(NULL, "timebase-enable");
681                 u32 *reg = (u32 *)get_property(np, "reg", NULL);
682
683                 if (np && reg && !strcmp(np->type, "gpio")) {
684                         core99_tb_gpio = *reg;
685                         if (core99_tb_gpio < 0x50)
686                                 core99_tb_gpio += 0x50;
687                         pmac_tb_freeze = smp_core99_gpio_tb_freeze;
688                         printk(KERN_INFO "Processor timebase sync using"
689                                " GPIO 0x%02x\n", core99_tb_gpio);
690                 }
691         }
692
693 #else /* CONFIG_PPC64 */
694
695         /* GPIO based HW sync on ppc32 Core99 */
696         if (pmac_tb_freeze == NULL && !machine_is_compatible("MacRISC4")) {
697                 struct device_node *cpu;
698                 u32 *tbprop = NULL;
699
700                 core99_tb_gpio = KL_GPIO_TB_ENABLE;     /* default value */
701                 cpu = of_find_node_by_type(NULL, "cpu");
702                 if (cpu != NULL) {
703                         tbprop = (u32 *)get_property(cpu, "timebase-enable",
704                                                      NULL);
705                         if (tbprop)
706                                 core99_tb_gpio = *tbprop;
707                         of_node_put(cpu);
708                 }
709                 pmac_tb_freeze = smp_core99_gpio_tb_freeze;
710                 printk(KERN_INFO "Processor timebase sync using"
711                        " GPIO 0x%02x\n", core99_tb_gpio);
712         }
713
714 #endif /* CONFIG_PPC64 */
715
716         /* No timebase sync, fallback to software */
717         if (pmac_tb_freeze == NULL) {
718                 smp_ops->give_timebase = smp_generic_give_timebase;
719                 smp_ops->take_timebase = smp_generic_take_timebase;
720                 printk(KERN_INFO "Processor timebase sync using software\n");
721         }
722
723 #ifndef CONFIG_PPC64
724         {
725                 int i;
726
727                 /* XXX should get this from reg properties */
728                 for (i = 1; i < ncpus; ++i)
729                         smp_hw_index[i] = i;
730         }
731 #endif
732
733         /* 32 bits SMP can't NAP */
734         if (!machine_is_compatible("MacRISC4"))
735                 powersave_nap = 0;
736 }
737
738 static int __init smp_core99_probe(void)
739 {
740         struct device_node *cpus;
741         int ncpus = 0;
742
743         if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
744
745         /* Count CPUs in the device-tree */
746         for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;)
747                 ++ncpus;
748
749         printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus);
750
751         /* Nothing more to do if less than 2 of them */
752         if (ncpus <= 1)
753                 return 1;
754
755         smp_core99_setup(ncpus);
756         mpic_request_ipis();
757         core99_init_caches(0);
758
759         return ncpus;
760 }
761
762 static void __devinit smp_core99_kick_cpu(int nr)
763 {
764         unsigned int save_vector;
765         unsigned long target, flags;
766         volatile unsigned int *vector
767                  = ((volatile unsigned int *)(KERNELBASE+0x100));
768
769         if (nr < 0 || nr > 3)
770                 return;
771
772         if (ppc_md.progress)
773                 ppc_md.progress("smp_core99_kick_cpu", 0x346);
774
775         local_irq_save(flags);
776         local_irq_disable();
777
778         /* Save reset vector */
779         save_vector = *vector;
780
781         /* Setup fake reset vector that does
782          *   b __secondary_start_pmac_0 + nr*8 - KERNELBASE
783          */
784         target = (unsigned long) __secondary_start_pmac_0 + nr * 8;
785         create_branch((unsigned long)vector, target, BRANCH_SET_LINK);
786
787         /* Put some life in our friend */
788         pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
789
790         /* FIXME: We wait a bit for the CPU to take the exception, I should
791          * instead wait for the entry code to set something for me. Well,
792          * ideally, all that crap will be done in prom.c and the CPU left
793          * in a RAM-based wait loop like CHRP.
794          */
795         mdelay(1);
796
797         /* Restore our exception vector */
798         *vector = save_vector;
799         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
800
801         local_irq_restore(flags);
802         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
803 }
804
805 static void __devinit smp_core99_setup_cpu(int cpu_nr)
806 {
807         /* Setup L2/L3 */
808         if (cpu_nr != 0)
809                 core99_init_caches(cpu_nr);
810
811         /* Setup openpic */
812         mpic_setup_this_cpu();
813
814         if (cpu_nr == 0) {
815 #ifdef CONFIG_PPC64
816                 extern void g5_phy_disable_cpu1(void);
817
818                 /* Close i2c bus if it was used for tb sync */
819                 if (pmac_tb_clock_chip_host) {
820                         pmac_low_i2c_close(pmac_tb_clock_chip_host);
821                         pmac_tb_clock_chip_host = NULL;
822                 }
823
824                 /* If we didn't start the second CPU, we must take
825                  * it off the bus
826                  */
827                 if (machine_is_compatible("MacRISC4") &&
828                     num_online_cpus() < 2)              
829                         g5_phy_disable_cpu1();
830 #endif /* CONFIG_PPC64 */
831
832                 if (ppc_md.progress)
833                         ppc_md.progress("core99_setup_cpu 0 done", 0x349);
834         }
835 }
836
837
838 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
839
840 int smp_core99_cpu_disable(void)
841 {
842         cpu_clear(smp_processor_id(), cpu_online_map);
843
844         /* XXX reset cpu affinity here */
845         mpic_cpu_set_priority(0xf);
846         asm volatile("mtdec %0" : : "r" (0x7fffffff));
847         mb();
848         udelay(20);
849         asm volatile("mtdec %0" : : "r" (0x7fffffff));
850         return 0;
851 }
852
853 extern void low_cpu_die(void) __attribute__((noreturn)); /* in sleep.S */
854 static int cpu_dead[NR_CPUS];
855
856 void cpu_die(void)
857 {
858         local_irq_disable();
859         cpu_dead[smp_processor_id()] = 1;
860         mb();
861         low_cpu_die();
862 }
863
864 void smp_core99_cpu_die(unsigned int cpu)
865 {
866         int timeout;
867
868         timeout = 1000;
869         while (!cpu_dead[cpu]) {
870                 if (--timeout == 0) {
871                         printk("CPU %u refused to die!\n", cpu);
872                         break;
873                 }
874                 msleep(1);
875         }
876         cpu_dead[cpu] = 0;
877 }
878
879 #endif
880
881 /* Core99 Macs (dual G4s and G5s) */
882 struct smp_ops_t core99_smp_ops = {
883         .message_pass   = smp_mpic_message_pass,
884         .probe          = smp_core99_probe,
885         .kick_cpu       = smp_core99_kick_cpu,
886         .setup_cpu      = smp_core99_setup_cpu,
887         .give_timebase  = smp_core99_give_timebase,
888         .take_timebase  = smp_core99_take_timebase,
889 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
890         .cpu_disable    = smp_core99_cpu_disable,
891         .cpu_die        = smp_core99_cpu_die,
892 #endif
893 };