Merge rsync://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / 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/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(struct pt_regs *regs)
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, regs);
178 }
179
180 irqreturn_t psurge_primary_intr(int irq, void *d, struct pt_regs *regs)
181 {
182         psurge_smp_message_recv(regs);
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
332         /* may need to flush here if secondary bats aren't setup */
333         for (a = KERNELBASE; a < KERNELBASE + 0x800000; a += 32)
334                 asm volatile("dcbf 0,%0" : : "r" (a) : "memory");
335         asm volatile("sync");
336
337         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu", 0x353);
338
339         out_be32(psurge_start, start);
340         mb();
341
342         psurge_set_ipi(nr);
343         udelay(10);
344         psurge_clr_ipi(nr);
345
346         if (ppc_md.progress) ppc_md.progress("smp_psurge_kick_cpu - done", 0x354);
347 }
348
349 /*
350  * With the dual-cpu powersurge board, the decrementers and timebases
351  * of both cpus are frozen after the secondary cpu is started up,
352  * until we give the secondary cpu another interrupt.  This routine
353  * uses this to get the timebases synchronized.
354  *  -- paulus.
355  */
356 static void __init psurge_dual_sync_tb(int cpu_nr)
357 {
358         int t;
359
360         set_dec(tb_ticks_per_jiffy);
361         /* XXX fixme */
362         set_tb(0, 0);
363
364         if (cpu_nr > 0) {
365                 mb();
366                 sec_tb_reset = 1;
367                 return;
368         }
369
370         /* wait for the secondary to have reset its TB before proceeding */
371         for (t = 10000000; t > 0 && !sec_tb_reset; --t)
372                 ;
373
374         /* now interrupt the secondary, starting both TBs */
375         psurge_set_ipi(1);
376 }
377
378 static struct irqaction psurge_irqaction = {
379         .handler = psurge_primary_intr,
380         .flags = IRQF_DISABLED,
381         .mask = CPU_MASK_NONE,
382         .name = "primary IPI",
383 };
384
385 static void __init smp_psurge_setup_cpu(int cpu_nr)
386 {
387
388         if (cpu_nr == 0) {
389                 /* If we failed to start the second CPU, we should still
390                  * send it an IPI to start the timebase & DEC or we might
391                  * have them stuck.
392                  */
393                 if (num_online_cpus() < 2) {
394                         if (psurge_type == PSURGE_DUAL)
395                                 psurge_set_ipi(1);
396                         return;
397                 }
398                 /* reset the entry point so if we get another intr we won't
399                  * try to startup again */
400                 out_be32(psurge_start, 0x100);
401                 if (setup_irq(30, &psurge_irqaction))
402                         printk(KERN_ERR "Couldn't get primary IPI interrupt");
403         }
404
405         if (psurge_type == PSURGE_DUAL)
406                 psurge_dual_sync_tb(cpu_nr);
407 }
408
409 void __init smp_psurge_take_timebase(void)
410 {
411         /* Dummy implementation */
412 }
413
414 void __init smp_psurge_give_timebase(void)
415 {
416         /* Dummy implementation */
417 }
418
419 /* PowerSurge-style Macs */
420 struct smp_ops_t psurge_smp_ops = {
421         .message_pass   = smp_psurge_message_pass,
422         .probe          = smp_psurge_probe,
423         .kick_cpu       = smp_psurge_kick_cpu,
424         .setup_cpu      = smp_psurge_setup_cpu,
425         .give_timebase  = smp_psurge_give_timebase,
426         .take_timebase  = smp_psurge_take_timebase,
427 };
428 #endif /* CONFIG_PPC32 - actually powersurge support */
429
430 /*
431  * Core 99 and later support
432  */
433
434 static void (*pmac_tb_freeze)(int freeze);
435 static u64 timebase;
436 static int tb_req;
437
438 static void smp_core99_give_timebase(void)
439 {
440         unsigned long flags;
441
442         local_irq_save(flags);
443
444         while(!tb_req)
445                 barrier();
446         tb_req = 0;
447         (*pmac_tb_freeze)(1);
448         mb();
449         timebase = get_tb();
450         mb();
451         while (timebase)
452                 barrier();
453         mb();
454         (*pmac_tb_freeze)(0);
455         mb();
456
457         local_irq_restore(flags);
458 }
459
460
461 static void __devinit smp_core99_take_timebase(void)
462 {
463         unsigned long flags;
464
465         local_irq_save(flags);
466
467         tb_req = 1;
468         mb();
469         while (!timebase)
470                 barrier();
471         mb();
472         set_tb(timebase >> 32, timebase & 0xffffffff);
473         timebase = 0;
474         mb();
475         set_dec(tb_ticks_per_jiffy/2);
476
477         local_irq_restore(flags);
478 }
479
480 #ifdef CONFIG_PPC64
481 /*
482  * G5s enable/disable the timebase via an i2c-connected clock chip.
483  */
484 static struct pmac_i2c_bus *pmac_tb_clock_chip_host;
485 static u8 pmac_tb_pulsar_addr;
486
487 static void smp_core99_cypress_tb_freeze(int freeze)
488 {
489         u8 data;
490         int rc;
491
492         /* Strangely, the device-tree says address is 0xd2, but darwin
493          * accesses 0xd0 ...
494          */
495         pmac_i2c_setmode(pmac_tb_clock_chip_host,
496                          pmac_i2c_mode_combined);
497         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
498                            0xd0 | pmac_i2c_read,
499                            1, 0x81, &data, 1);
500         if (rc != 0)
501                 goto bail;
502
503         data = (data & 0xf3) | (freeze ? 0x00 : 0x0c);
504
505         pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
506         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
507                            0xd0 | pmac_i2c_write,
508                            1, 0x81, &data, 1);
509
510  bail:
511         if (rc != 0) {
512                 printk("Cypress Timebase %s rc: %d\n",
513                        freeze ? "freeze" : "unfreeze", rc);
514                 panic("Timebase freeze failed !\n");
515         }
516 }
517
518
519 static void smp_core99_pulsar_tb_freeze(int freeze)
520 {
521         u8 data;
522         int rc;
523
524         pmac_i2c_setmode(pmac_tb_clock_chip_host,
525                          pmac_i2c_mode_combined);
526         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
527                            pmac_tb_pulsar_addr | pmac_i2c_read,
528                            1, 0x2e, &data, 1);
529         if (rc != 0)
530                 goto bail;
531
532         data = (data & 0x88) | (freeze ? 0x11 : 0x22);
533
534         pmac_i2c_setmode(pmac_tb_clock_chip_host, pmac_i2c_mode_stdsub);
535         rc = pmac_i2c_xfer(pmac_tb_clock_chip_host,
536                            pmac_tb_pulsar_addr | pmac_i2c_write,
537                            1, 0x2e, &data, 1);
538  bail:
539         if (rc != 0) {
540                 printk(KERN_ERR "Pulsar Timebase %s rc: %d\n",
541                        freeze ? "freeze" : "unfreeze", rc);
542                 panic("Timebase freeze failed !\n");
543         }
544 }
545
546 static void __init smp_core99_setup_i2c_hwsync(int ncpus)
547 {
548         struct device_node *cc = NULL;  
549         struct device_node *p;
550         const char *name = NULL;
551         u32 *reg;
552         int ok;
553
554         /* Look for the clock chip */
555         while ((cc = of_find_node_by_name(cc, "i2c-hwclock")) != NULL) {
556                 p = of_get_parent(cc);
557                 ok = p && device_is_compatible(p, "uni-n-i2c");
558                 of_node_put(p);
559                 if (!ok)
560                         continue;
561
562                 pmac_tb_clock_chip_host = pmac_i2c_find_bus(cc);
563                 if (pmac_tb_clock_chip_host == NULL)
564                         continue;
565                 reg = (u32 *)get_property(cc, "reg", NULL);
566                 if (reg == NULL)
567                         continue;
568                 switch (*reg) {
569                 case 0xd2:
570                         if (device_is_compatible(cc,"pulsar-legacy-slewing")) {
571                                 pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
572                                 pmac_tb_pulsar_addr = 0xd2;
573                                 name = "Pulsar";
574                         } else if (device_is_compatible(cc, "cy28508")) {
575                                 pmac_tb_freeze = smp_core99_cypress_tb_freeze;
576                                 name = "Cypress";
577                         }
578                         break;
579                 case 0xd4:
580                         pmac_tb_freeze = smp_core99_pulsar_tb_freeze;
581                         pmac_tb_pulsar_addr = 0xd4;
582                         name = "Pulsar";
583                         break;
584                 }
585                 if (pmac_tb_freeze != NULL)
586                         break;
587         }
588         if (pmac_tb_freeze != NULL) {
589                 /* Open i2c bus for synchronous access */
590                 if (pmac_i2c_open(pmac_tb_clock_chip_host, 1)) {
591                         printk(KERN_ERR "Failed top open i2c bus for clock"
592                                " sync, fallback to software sync !\n");
593                         goto no_i2c_sync;
594                 }
595                 printk(KERN_INFO "Processor timebase sync using %s i2c clock\n",
596                        name);
597                 return;
598         }
599  no_i2c_sync:
600         pmac_tb_freeze = NULL;
601         pmac_tb_clock_chip_host = NULL;
602 }
603
604
605
606 /*
607  * Newer G5s uses a platform function
608  */
609
610 static void smp_core99_pfunc_tb_freeze(int freeze)
611 {
612         struct device_node *cpus;
613         struct pmf_args args;
614
615         cpus = of_find_node_by_path("/cpus");
616         BUG_ON(cpus == NULL);
617         args.count = 1;
618         args.u[0].v = !freeze;
619         pmf_call_function(cpus, "cpu-timebase", &args);
620         of_node_put(cpus);
621 }
622
623 #else /* CONFIG_PPC64 */
624
625 /*
626  * SMP G4 use a GPIO to enable/disable the timebase.
627  */
628
629 static unsigned int core99_tb_gpio;     /* Timebase freeze GPIO */
630
631 static void smp_core99_gpio_tb_freeze(int freeze)
632 {
633         if (freeze)
634                 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 4);
635         else
636                 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, core99_tb_gpio, 0);
637         pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, core99_tb_gpio, 0);
638 }
639
640
641 #endif /* !CONFIG_PPC64 */
642
643 /* L2 and L3 cache settings to pass from CPU0 to CPU1 on G4 cpus */
644 volatile static long int core99_l2_cache;
645 volatile static long int core99_l3_cache;
646
647 static void __devinit core99_init_caches(int cpu)
648 {
649 #ifndef CONFIG_PPC64
650         if (!cpu_has_feature(CPU_FTR_L2CR))
651                 return;
652
653         if (cpu == 0) {
654                 core99_l2_cache = _get_L2CR();
655                 printk("CPU0: L2CR is %lx\n", core99_l2_cache);
656         } else {
657                 printk("CPU%d: L2CR was %lx\n", cpu, _get_L2CR());
658                 _set_L2CR(0);
659                 _set_L2CR(core99_l2_cache);
660                 printk("CPU%d: L2CR set to %lx\n", cpu, core99_l2_cache);
661         }
662
663         if (!cpu_has_feature(CPU_FTR_L3CR))
664                 return;
665
666         if (cpu == 0){
667                 core99_l3_cache = _get_L3CR();
668                 printk("CPU0: L3CR is %lx\n", core99_l3_cache);
669         } else {
670                 printk("CPU%d: L3CR was %lx\n", cpu, _get_L3CR());
671                 _set_L3CR(0);
672                 _set_L3CR(core99_l3_cache);
673                 printk("CPU%d: L3CR set to %lx\n", cpu, core99_l3_cache);
674         }
675 #endif /* !CONFIG_PPC64 */
676 }
677
678 static void __init smp_core99_setup(int ncpus)
679 {
680 #ifdef CONFIG_PPC64
681
682         /* i2c based HW sync on some G5s */
683         if (machine_is_compatible("PowerMac7,2") ||
684             machine_is_compatible("PowerMac7,3") ||
685             machine_is_compatible("RackMac3,1"))
686                 smp_core99_setup_i2c_hwsync(ncpus);
687
688         /* pfunc based HW sync on recent G5s */
689         if (pmac_tb_freeze == NULL) {
690                 struct device_node *cpus =
691                         of_find_node_by_path("/cpus");
692                 if (cpus &&
693                     get_property(cpus, "platform-cpu-timebase", NULL)) {
694                         pmac_tb_freeze = smp_core99_pfunc_tb_freeze;
695                         printk(KERN_INFO "Processor timebase sync using"
696                                " platform function\n");
697                 }
698         }
699
700 #else /* CONFIG_PPC64 */
701
702         /* GPIO based HW sync on ppc32 Core99 */
703         if (pmac_tb_freeze == NULL && !machine_is_compatible("MacRISC4")) {
704                 struct device_node *cpu;
705                 u32 *tbprop = NULL;
706
707                 core99_tb_gpio = KL_GPIO_TB_ENABLE;     /* default value */
708                 cpu = of_find_node_by_type(NULL, "cpu");
709                 if (cpu != NULL) {
710                         tbprop = (u32 *)get_property(cpu, "timebase-enable",
711                                                      NULL);
712                         if (tbprop)
713                                 core99_tb_gpio = *tbprop;
714                         of_node_put(cpu);
715                 }
716                 pmac_tb_freeze = smp_core99_gpio_tb_freeze;
717                 printk(KERN_INFO "Processor timebase sync using"
718                        " GPIO 0x%02x\n", core99_tb_gpio);
719         }
720
721 #endif /* CONFIG_PPC64 */
722
723         /* No timebase sync, fallback to software */
724         if (pmac_tb_freeze == NULL) {
725                 smp_ops->give_timebase = smp_generic_give_timebase;
726                 smp_ops->take_timebase = smp_generic_take_timebase;
727                 printk(KERN_INFO "Processor timebase sync using software\n");
728         }
729
730 #ifndef CONFIG_PPC64
731         {
732                 int i;
733
734                 /* XXX should get this from reg properties */
735                 for (i = 1; i < ncpus; ++i)
736                         smp_hw_index[i] = i;
737         }
738 #endif
739
740         /* 32 bits SMP can't NAP */
741         if (!machine_is_compatible("MacRISC4"))
742                 powersave_nap = 0;
743 }
744
745 static int __init smp_core99_probe(void)
746 {
747         struct device_node *cpus;
748         int ncpus = 0;
749
750         if (ppc_md.progress) ppc_md.progress("smp_core99_probe", 0x345);
751
752         /* Count CPUs in the device-tree */
753         for (cpus = NULL; (cpus = of_find_node_by_type(cpus, "cpu")) != NULL;)
754                 ++ncpus;
755
756         printk(KERN_INFO "PowerMac SMP probe found %d cpus\n", ncpus);
757
758         /* Nothing more to do if less than 2 of them */
759         if (ncpus <= 1)
760                 return 1;
761
762         /* We need to perform some early initialisations before we can start
763          * setting up SMP as we are running before initcalls
764          */
765         pmac_pfunc_base_install();
766         pmac_i2c_init();
767
768         /* Setup various bits like timebase sync method, ability to nap, ... */
769         smp_core99_setup(ncpus);
770
771         /* Install IPIs */
772         mpic_request_ipis();
773
774         /* Collect l2cr and l3cr values from CPU 0 */
775         core99_init_caches(0);
776
777         return ncpus;
778 }
779
780 static void __devinit smp_core99_kick_cpu(int nr)
781 {
782         unsigned int save_vector;
783         unsigned long target, flags;
784         volatile unsigned int *vector
785                  = ((volatile unsigned int *)(KERNELBASE+0x100));
786
787         if (nr < 0 || nr > 3)
788                 return;
789
790         if (ppc_md.progress)
791                 ppc_md.progress("smp_core99_kick_cpu", 0x346);
792
793         local_irq_save(flags);
794         local_irq_disable();
795
796         /* Save reset vector */
797         save_vector = *vector;
798
799         /* Setup fake reset vector that does
800          *   b __secondary_start_pmac_0 + nr*8 - KERNELBASE
801          */
802         target = (unsigned long) __secondary_start_pmac_0 + nr * 8;
803         create_branch((unsigned long)vector, target, BRANCH_SET_LINK);
804
805         /* Put some life in our friend */
806         pmac_call_feature(PMAC_FTR_RESET_CPU, NULL, nr, 0);
807
808         /* FIXME: We wait a bit for the CPU to take the exception, I should
809          * instead wait for the entry code to set something for me. Well,
810          * ideally, all that crap will be done in prom.c and the CPU left
811          * in a RAM-based wait loop like CHRP.
812          */
813         mdelay(1);
814
815         /* Restore our exception vector */
816         *vector = save_vector;
817         flush_icache_range((unsigned long) vector, (unsigned long) vector + 4);
818
819         local_irq_restore(flags);
820         if (ppc_md.progress) ppc_md.progress("smp_core99_kick_cpu done", 0x347);
821 }
822
823 static void __devinit smp_core99_setup_cpu(int cpu_nr)
824 {
825         /* Setup L2/L3 */
826         if (cpu_nr != 0)
827                 core99_init_caches(cpu_nr);
828
829         /* Setup openpic */
830         mpic_setup_this_cpu();
831
832         if (cpu_nr == 0) {
833 #ifdef CONFIG_PPC64
834                 extern void g5_phy_disable_cpu1(void);
835
836                 /* Close i2c bus if it was used for tb sync */
837                 if (pmac_tb_clock_chip_host) {
838                         pmac_i2c_close(pmac_tb_clock_chip_host);
839                         pmac_tb_clock_chip_host = NULL;
840                 }
841
842                 /* If we didn't start the second CPU, we must take
843                  * it off the bus
844                  */
845                 if (machine_is_compatible("MacRISC4") &&
846                     num_online_cpus() < 2)              
847                         g5_phy_disable_cpu1();
848 #endif /* CONFIG_PPC64 */
849
850                 if (ppc_md.progress)
851                         ppc_md.progress("core99_setup_cpu 0 done", 0x349);
852         }
853 }
854
855
856 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
857
858 int smp_core99_cpu_disable(void)
859 {
860         cpu_clear(smp_processor_id(), cpu_online_map);
861
862         /* XXX reset cpu affinity here */
863         mpic_cpu_set_priority(0xf);
864         asm volatile("mtdec %0" : : "r" (0x7fffffff));
865         mb();
866         udelay(20);
867         asm volatile("mtdec %0" : : "r" (0x7fffffff));
868         return 0;
869 }
870
871 extern void low_cpu_die(void) __attribute__((noreturn)); /* in sleep.S */
872 static int cpu_dead[NR_CPUS];
873
874 void cpu_die(void)
875 {
876         local_irq_disable();
877         cpu_dead[smp_processor_id()] = 1;
878         mb();
879         low_cpu_die();
880 }
881
882 void smp_core99_cpu_die(unsigned int cpu)
883 {
884         int timeout;
885
886         timeout = 1000;
887         while (!cpu_dead[cpu]) {
888                 if (--timeout == 0) {
889                         printk("CPU %u refused to die!\n", cpu);
890                         break;
891                 }
892                 msleep(1);
893         }
894         cpu_dead[cpu] = 0;
895 }
896
897 #endif
898
899 /* Core99 Macs (dual G4s and G5s) */
900 struct smp_ops_t core99_smp_ops = {
901         .message_pass   = smp_mpic_message_pass,
902         .probe          = smp_core99_probe,
903         .kick_cpu       = smp_core99_kick_cpu,
904         .setup_cpu      = smp_core99_setup_cpu,
905         .give_timebase  = smp_core99_give_timebase,
906         .take_timebase  = smp_core99_take_timebase,
907 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
908         .cpu_disable    = smp_core99_cpu_disable,
909         .cpu_die        = smp_core99_cpu_die,
910 #endif
911 };