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TOMOYO Linux Cross Reference
Linux/arch/powerpc/kernel/setup-common.c

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  1 /*
  2  * Common boot and setup code for both 32-bit and 64-bit.
  3  * Extracted from arch/powerpc/kernel/setup_64.c.
  4  *
  5  * Copyright (C) 2001 PPC64 Team, IBM Corp
  6  *
  7  *      This program is free software; you can redistribute it and/or
  8  *      modify it under the terms of the GNU General Public License
  9  *      as published by the Free Software Foundation; either version
 10  *      2 of the License, or (at your option) any later version.
 11  */
 12 
 13 #undef DEBUG
 14 
 15 #include <linux/export.h>
 16 #include <linux/string.h>
 17 #include <linux/sched.h>
 18 #include <linux/init.h>
 19 #include <linux/kernel.h>
 20 #include <linux/reboot.h>
 21 #include <linux/delay.h>
 22 #include <linux/initrd.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/seq_file.h>
 25 #include <linux/ioport.h>
 26 #include <linux/console.h>
 27 #include <linux/screen_info.h>
 28 #include <linux/root_dev.h>
 29 #include <linux/notifier.h>
 30 #include <linux/cpu.h>
 31 #include <linux/unistd.h>
 32 #include <linux/serial.h>
 33 #include <linux/serial_8250.h>
 34 #include <linux/debugfs.h>
 35 #include <linux/percpu.h>
 36 #include <linux/memblock.h>
 37 #include <linux/of_platform.h>
 38 #include <asm/io.h>
 39 #include <asm/paca.h>
 40 #include <asm/prom.h>
 41 #include <asm/processor.h>
 42 #include <asm/vdso_datapage.h>
 43 #include <asm/pgtable.h>
 44 #include <asm/smp.h>
 45 #include <asm/elf.h>
 46 #include <asm/machdep.h>
 47 #include <asm/time.h>
 48 #include <asm/cputable.h>
 49 #include <asm/sections.h>
 50 #include <asm/firmware.h>
 51 #include <asm/btext.h>
 52 #include <asm/nvram.h>
 53 #include <asm/setup.h>
 54 #include <asm/rtas.h>
 55 #include <asm/iommu.h>
 56 #include <asm/serial.h>
 57 #include <asm/cache.h>
 58 #include <asm/page.h>
 59 #include <asm/mmu.h>
 60 #include <asm/xmon.h>
 61 #include <asm/cputhreads.h>
 62 #include <mm/mmu_decl.h>
 63 #include <asm/fadump.h>
 64 
 65 #include "setup.h"
 66 
 67 #ifdef DEBUG
 68 #include <asm/udbg.h>
 69 #define DBG(fmt...) udbg_printf(fmt)
 70 #else
 71 #define DBG(fmt...)
 72 #endif
 73 
 74 /* The main machine-dep calls structure
 75  */
 76 struct machdep_calls ppc_md;
 77 EXPORT_SYMBOL(ppc_md);
 78 struct machdep_calls *machine_id;
 79 EXPORT_SYMBOL(machine_id);
 80 
 81 unsigned long klimit = (unsigned long) _end;
 82 
 83 char cmd_line[COMMAND_LINE_SIZE];
 84 
 85 /*
 86  * This still seems to be needed... -- paulus
 87  */ 
 88 struct screen_info screen_info = {
 89         .orig_x = 0,
 90         .orig_y = 25,
 91         .orig_video_cols = 80,
 92         .orig_video_lines = 25,
 93         .orig_video_isVGA = 1,
 94         .orig_video_points = 16
 95 };
 96 
 97 /* Variables required to store legacy IO irq routing */
 98 int of_i8042_kbd_irq;
 99 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
100 int of_i8042_aux_irq;
101 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
102 
103 #ifdef __DO_IRQ_CANON
104 /* XXX should go elsewhere eventually */
105 int ppc_do_canonicalize_irqs;
106 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
107 #endif
108 
109 /* also used by kexec */
110 void machine_shutdown(void)
111 {
112 #ifdef CONFIG_FA_DUMP
113         /*
114          * if fadump is active, cleanup the fadump registration before we
115          * shutdown.
116          */
117         fadump_cleanup();
118 #endif
119 
120         if (ppc_md.machine_shutdown)
121                 ppc_md.machine_shutdown();
122 }
123 
124 void machine_restart(char *cmd)
125 {
126         machine_shutdown();
127         if (ppc_md.restart)
128                 ppc_md.restart(cmd);
129 #ifdef CONFIG_SMP
130         smp_send_stop();
131 #endif
132         printk(KERN_EMERG "System Halted, OK to turn off power\n");
133         local_irq_disable();
134         while (1) ;
135 }
136 
137 void machine_power_off(void)
138 {
139         machine_shutdown();
140         if (ppc_md.power_off)
141                 ppc_md.power_off();
142 #ifdef CONFIG_SMP
143         smp_send_stop();
144 #endif
145         printk(KERN_EMERG "System Halted, OK to turn off power\n");
146         local_irq_disable();
147         while (1) ;
148 }
149 /* Used by the G5 thermal driver */
150 EXPORT_SYMBOL_GPL(machine_power_off);
151 
152 void (*pm_power_off)(void) = machine_power_off;
153 EXPORT_SYMBOL_GPL(pm_power_off);
154 
155 void machine_halt(void)
156 {
157         machine_shutdown();
158         if (ppc_md.halt)
159                 ppc_md.halt();
160 #ifdef CONFIG_SMP
161         smp_send_stop();
162 #endif
163         printk(KERN_EMERG "System Halted, OK to turn off power\n");
164         local_irq_disable();
165         while (1) ;
166 }
167 
168 
169 #ifdef CONFIG_TAU
170 extern u32 cpu_temp(unsigned long cpu);
171 extern u32 cpu_temp_both(unsigned long cpu);
172 #endif /* CONFIG_TAU */
173 
174 #ifdef CONFIG_SMP
175 DEFINE_PER_CPU(unsigned int, cpu_pvr);
176 #endif
177 
178 static void show_cpuinfo_summary(struct seq_file *m)
179 {
180         struct device_node *root;
181         const char *model = NULL;
182 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
183         unsigned long bogosum = 0;
184         int i;
185         for_each_online_cpu(i)
186                 bogosum += loops_per_jiffy;
187         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
188                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
189 #endif /* CONFIG_SMP && CONFIG_PPC32 */
190         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
191         if (ppc_md.name)
192                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
193         root = of_find_node_by_path("/");
194         if (root)
195                 model = of_get_property(root, "model", NULL);
196         if (model)
197                 seq_printf(m, "model\t\t: %s\n", model);
198         of_node_put(root);
199 
200         if (ppc_md.show_cpuinfo != NULL)
201                 ppc_md.show_cpuinfo(m);
202 
203 #ifdef CONFIG_PPC32
204         /* Display the amount of memory */
205         seq_printf(m, "Memory\t\t: %d MB\n",
206                    (unsigned int)(total_memory / (1024 * 1024)));
207 #endif
208 }
209 
210 static int show_cpuinfo(struct seq_file *m, void *v)
211 {
212         unsigned long cpu_id = (unsigned long)v - 1;
213         unsigned int pvr;
214         unsigned short maj;
215         unsigned short min;
216 
217         /* We only show online cpus: disable preempt (overzealous, I
218          * knew) to prevent cpu going down. */
219         preempt_disable();
220         if (!cpu_online(cpu_id)) {
221                 preempt_enable();
222                 return 0;
223         }
224 
225 #ifdef CONFIG_SMP
226         pvr = per_cpu(cpu_pvr, cpu_id);
227 #else
228         pvr = mfspr(SPRN_PVR);
229 #endif
230         maj = (pvr >> 8) & 0xFF;
231         min = pvr & 0xFF;
232 
233         seq_printf(m, "processor\t: %lu\n", cpu_id);
234         seq_printf(m, "cpu\t\t: ");
235 
236         if (cur_cpu_spec->pvr_mask)
237                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
238         else
239                 seq_printf(m, "unknown (%08x)", pvr);
240 
241 #ifdef CONFIG_ALTIVEC
242         if (cpu_has_feature(CPU_FTR_ALTIVEC))
243                 seq_printf(m, ", altivec supported");
244 #endif /* CONFIG_ALTIVEC */
245 
246         seq_printf(m, "\n");
247 
248 #ifdef CONFIG_TAU
249         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
250 #ifdef CONFIG_TAU_AVERAGE
251                 /* more straightforward, but potentially misleading */
252                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
253                            cpu_temp(cpu_id));
254 #else
255                 /* show the actual temp sensor range */
256                 u32 temp;
257                 temp = cpu_temp_both(cpu_id);
258                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
259                            temp & 0xff, temp >> 16);
260 #endif
261         }
262 #endif /* CONFIG_TAU */
263 
264         /*
265          * Assume here that all clock rates are the same in a
266          * smp system.  -- Cort
267          */
268         if (ppc_proc_freq)
269                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
270                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
271 
272         if (ppc_md.show_percpuinfo != NULL)
273                 ppc_md.show_percpuinfo(m, cpu_id);
274 
275         /* If we are a Freescale core do a simple check so
276          * we dont have to keep adding cases in the future */
277         if (PVR_VER(pvr) & 0x8000) {
278                 switch (PVR_VER(pvr)) {
279                 case 0x8000:    /* 7441/7450/7451, Voyager */
280                 case 0x8001:    /* 7445/7455, Apollo 6 */
281                 case 0x8002:    /* 7447/7457, Apollo 7 */
282                 case 0x8003:    /* 7447A, Apollo 7 PM */
283                 case 0x8004:    /* 7448, Apollo 8 */
284                 case 0x800c:    /* 7410, Nitro */
285                         maj = ((pvr >> 8) & 0xF);
286                         min = PVR_MIN(pvr);
287                         break;
288                 default:        /* e500/book-e */
289                         maj = PVR_MAJ(pvr);
290                         min = PVR_MIN(pvr);
291                         break;
292                 }
293         } else {
294                 switch (PVR_VER(pvr)) {
295                         case 0x0020:    /* 403 family */
296                                 maj = PVR_MAJ(pvr) + 1;
297                                 min = PVR_MIN(pvr);
298                                 break;
299                         case 0x1008:    /* 740P/750P ?? */
300                                 maj = ((pvr >> 8) & 0xFF) - 1;
301                                 min = pvr & 0xFF;
302                                 break;
303                         default:
304                                 maj = (pvr >> 8) & 0xFF;
305                                 min = pvr & 0xFF;
306                                 break;
307                 }
308         }
309 
310         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
311                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
312 
313 #ifdef CONFIG_PPC32
314         seq_printf(m, "bogomips\t: %lu.%02lu\n",
315                    loops_per_jiffy / (500000/HZ),
316                    (loops_per_jiffy / (5000/HZ)) % 100);
317 #endif
318 
319 #ifdef CONFIG_SMP
320         seq_printf(m, "\n");
321 #endif
322 
323         preempt_enable();
324 
325         /* If this is the last cpu, print the summary */
326         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
327                 show_cpuinfo_summary(m);
328 
329         return 0;
330 }
331 
332 static void *c_start(struct seq_file *m, loff_t *pos)
333 {
334         if (*pos == 0)  /* just in case, cpu 0 is not the first */
335                 *pos = cpumask_first(cpu_online_mask);
336         else
337                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
338         if ((*pos) < nr_cpu_ids)
339                 return (void *)(unsigned long)(*pos + 1);
340         return NULL;
341 }
342 
343 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
344 {
345         (*pos)++;
346         return c_start(m, pos);
347 }
348 
349 static void c_stop(struct seq_file *m, void *v)
350 {
351 }
352 
353 const struct seq_operations cpuinfo_op = {
354         .start =c_start,
355         .next = c_next,
356         .stop = c_stop,
357         .show = show_cpuinfo,
358 };
359 
360 void __init check_for_initrd(void)
361 {
362 #ifdef CONFIG_BLK_DEV_INITRD
363         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
364             initrd_start, initrd_end);
365 
366         /* If we were passed an initrd, set the ROOT_DEV properly if the values
367          * look sensible. If not, clear initrd reference.
368          */
369         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
370             initrd_end > initrd_start)
371                 ROOT_DEV = Root_RAM0;
372         else
373                 initrd_start = initrd_end = 0;
374 
375         if (initrd_start)
376                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
377 
378         DBG(" <- check_for_initrd()\n");
379 #endif /* CONFIG_BLK_DEV_INITRD */
380 }
381 
382 #ifdef CONFIG_SMP
383 
384 int threads_per_core, threads_shift;
385 cpumask_t threads_core_mask;
386 EXPORT_SYMBOL_GPL(threads_per_core);
387 EXPORT_SYMBOL_GPL(threads_shift);
388 EXPORT_SYMBOL_GPL(threads_core_mask);
389 
390 static void __init cpu_init_thread_core_maps(int tpc)
391 {
392         int i;
393 
394         threads_per_core = tpc;
395         cpumask_clear(&threads_core_mask);
396 
397         /* This implementation only supports power of 2 number of threads
398          * for simplicity and performance
399          */
400         threads_shift = ilog2(tpc);
401         BUG_ON(tpc != (1 << threads_shift));
402 
403         for (i = 0; i < tpc; i++)
404                 cpumask_set_cpu(i, &threads_core_mask);
405 
406         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
407                tpc, tpc > 1 ? "s" : "");
408         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
409 }
410 
411 
412 /**
413  * setup_cpu_maps - initialize the following cpu maps:
414  *                  cpu_possible_mask
415  *                  cpu_present_mask
416  *
417  * Having the possible map set up early allows us to restrict allocations
418  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
419  *
420  * We do not initialize the online map here; cpus set their own bits in
421  * cpu_online_mask as they come up.
422  *
423  * This function is valid only for Open Firmware systems.  finish_device_tree
424  * must be called before using this.
425  *
426  * While we're here, we may as well set the "physical" cpu ids in the paca.
427  *
428  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
429  */
430 void __init smp_setup_cpu_maps(void)
431 {
432         struct device_node *dn = NULL;
433         int cpu = 0;
434         int nthreads = 1;
435 
436         DBG("smp_setup_cpu_maps()\n");
437 
438         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
439                 const int *intserv;
440                 int j, len;
441 
442                 DBG("  * %s...\n", dn->full_name);
443 
444                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
445                                 &len);
446                 if (intserv) {
447                         nthreads = len / sizeof(int);
448                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
449                             nthreads);
450                 } else {
451                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
452                         intserv = of_get_property(dn, "reg", NULL);
453                         if (!intserv)
454                                 intserv = &cpu; /* assume logical == phys */
455                 }
456 
457                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
458                         DBG("    thread %d -> cpu %d (hard id %d)\n",
459                             j, cpu, intserv[j]);
460                         set_cpu_present(cpu, true);
461                         set_hard_smp_processor_id(cpu, intserv[j]);
462                         set_cpu_possible(cpu, true);
463                         cpu++;
464                 }
465         }
466 
467         /* If no SMT supported, nthreads is forced to 1 */
468         if (!cpu_has_feature(CPU_FTR_SMT)) {
469                 DBG("  SMT disabled ! nthreads forced to 1\n");
470                 nthreads = 1;
471         }
472 
473 #ifdef CONFIG_PPC64
474         /*
475          * On pSeries LPAR, we need to know how many cpus
476          * could possibly be added to this partition.
477          */
478         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
479             (dn = of_find_node_by_path("/rtas"))) {
480                 int num_addr_cell, num_size_cell, maxcpus;
481                 const unsigned int *ireg;
482 
483                 num_addr_cell = of_n_addr_cells(dn);
484                 num_size_cell = of_n_size_cells(dn);
485 
486                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
487 
488                 if (!ireg)
489                         goto out;
490 
491                 maxcpus = ireg[num_addr_cell + num_size_cell];
492 
493                 /* Double maxcpus for processors which have SMT capability */
494                 if (cpu_has_feature(CPU_FTR_SMT))
495                         maxcpus *= nthreads;
496 
497                 if (maxcpus > nr_cpu_ids) {
498                         printk(KERN_WARNING
499                                "Partition configured for %d cpus, "
500                                "operating system maximum is %d.\n",
501                                maxcpus, nr_cpu_ids);
502                         maxcpus = nr_cpu_ids;
503                 } else
504                         printk(KERN_INFO "Partition configured for %d cpus.\n",
505                                maxcpus);
506 
507                 for (cpu = 0; cpu < maxcpus; cpu++)
508                         set_cpu_possible(cpu, true);
509         out:
510                 of_node_put(dn);
511         }
512         vdso_data->processorCount = num_present_cpus();
513 #endif /* CONFIG_PPC64 */
514 
515         /* Initialize CPU <=> thread mapping/
516          *
517          * WARNING: We assume that the number of threads is the same for
518          * every CPU in the system. If that is not the case, then some code
519          * here will have to be reworked
520          */
521         cpu_init_thread_core_maps(nthreads);
522 
523         /* Now that possible cpus are set, set nr_cpu_ids for later use */
524         setup_nr_cpu_ids();
525 
526         free_unused_pacas();
527 }
528 #endif /* CONFIG_SMP */
529 
530 #ifdef CONFIG_PCSPKR_PLATFORM
531 static __init int add_pcspkr(void)
532 {
533         struct device_node *np;
534         struct platform_device *pd;
535         int ret;
536 
537         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
538         of_node_put(np);
539         if (!np)
540                 return -ENODEV;
541 
542         pd = platform_device_alloc("pcspkr", -1);
543         if (!pd)
544                 return -ENOMEM;
545 
546         ret = platform_device_add(pd);
547         if (ret)
548                 platform_device_put(pd);
549 
550         return ret;
551 }
552 device_initcall(add_pcspkr);
553 #endif  /* CONFIG_PCSPKR_PLATFORM */
554 
555 void probe_machine(void)
556 {
557         extern struct machdep_calls __machine_desc_start;
558         extern struct machdep_calls __machine_desc_end;
559 
560         /*
561          * Iterate all ppc_md structures until we find the proper
562          * one for the current machine type
563          */
564         DBG("Probing machine type ...\n");
565 
566         for (machine_id = &__machine_desc_start;
567              machine_id < &__machine_desc_end;
568              machine_id++) {
569                 DBG("  %s ...", machine_id->name);
570                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
571                 if (ppc_md.probe()) {
572                         DBG(" match !\n");
573                         break;
574                 }
575                 DBG("\n");
576         }
577         /* What can we do if we didn't find ? */
578         if (machine_id >= &__machine_desc_end) {
579                 DBG("No suitable machine found !\n");
580                 for (;;);
581         }
582 
583         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
584 }
585 
586 /* Match a class of boards, not a specific device configuration. */
587 int check_legacy_ioport(unsigned long base_port)
588 {
589         struct device_node *parent, *np = NULL;
590         int ret = -ENODEV;
591 
592         switch(base_port) {
593         case I8042_DATA_REG:
594                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
595                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
596                 if (np) {
597                         parent = of_get_parent(np);
598 
599                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
600                         if (!of_i8042_kbd_irq)
601                                 of_i8042_kbd_irq = 1;
602 
603                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
604                         if (!of_i8042_aux_irq)
605                                 of_i8042_aux_irq = 12;
606 
607                         of_node_put(np);
608                         np = parent;
609                         break;
610                 }
611                 np = of_find_node_by_type(NULL, "8042");
612                 /* Pegasos has no device_type on its 8042 node, look for the
613                  * name instead */
614                 if (!np)
615                         np = of_find_node_by_name(NULL, "8042");
616                 if (np) {
617                         of_i8042_kbd_irq = 1;
618                         of_i8042_aux_irq = 12;
619                 }
620                 break;
621         case FDC_BASE: /* FDC1 */
622                 np = of_find_node_by_type(NULL, "fdc");
623                 break;
624         default:
625                 /* ipmi is supposed to fail here */
626                 break;
627         }
628         if (!np)
629                 return ret;
630         parent = of_get_parent(np);
631         if (parent) {
632                 if (strcmp(parent->type, "isa") == 0)
633                         ret = 0;
634                 of_node_put(parent);
635         }
636         of_node_put(np);
637         return ret;
638 }
639 EXPORT_SYMBOL(check_legacy_ioport);
640 
641 static int ppc_panic_event(struct notifier_block *this,
642                              unsigned long event, void *ptr)
643 {
644         /*
645          * If firmware-assisted dump has been registered then trigger
646          * firmware-assisted dump and let firmware handle everything else.
647          */
648         crash_fadump(NULL, ptr);
649         ppc_md.panic(ptr);  /* May not return */
650         return NOTIFY_DONE;
651 }
652 
653 static struct notifier_block ppc_panic_block = {
654         .notifier_call = ppc_panic_event,
655         .priority = INT_MIN /* may not return; must be done last */
656 };
657 
658 void __init setup_panic(void)
659 {
660         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
661 }
662 
663 #ifdef CONFIG_CHECK_CACHE_COHERENCY
664 /*
665  * For platforms that have configurable cache-coherency.  This function
666  * checks that the cache coherency setting of the kernel matches the setting
667  * left by the firmware, as indicated in the device tree.  Since a mismatch
668  * will eventually result in DMA failures, we print * and error and call
669  * BUG() in that case.
670  */
671 
672 #ifdef CONFIG_NOT_COHERENT_CACHE
673 #define KERNEL_COHERENCY        0
674 #else
675 #define KERNEL_COHERENCY        1
676 #endif
677 
678 static int __init check_cache_coherency(void)
679 {
680         struct device_node *np;
681         const void *prop;
682         int devtree_coherency;
683 
684         np = of_find_node_by_path("/");
685         prop = of_get_property(np, "coherency-off", NULL);
686         of_node_put(np);
687 
688         devtree_coherency = prop ? 0 : 1;
689 
690         if (devtree_coherency != KERNEL_COHERENCY) {
691                 printk(KERN_ERR
692                         "kernel coherency:%s != device tree_coherency:%s\n",
693                         KERNEL_COHERENCY ? "on" : "off",
694                         devtree_coherency ? "on" : "off");
695                 BUG();
696         }
697 
698         return 0;
699 }
700 
701 late_initcall(check_cache_coherency);
702 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
703 
704 #ifdef CONFIG_DEBUG_FS
705 struct dentry *powerpc_debugfs_root;
706 EXPORT_SYMBOL(powerpc_debugfs_root);
707 
708 static int powerpc_debugfs_init(void)
709 {
710         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
711 
712         return powerpc_debugfs_root == NULL;
713 }
714 arch_initcall(powerpc_debugfs_init);
715 #endif
716 
717 #ifdef CONFIG_BOOKE_WDT
718 extern u32 booke_wdt_enabled;
719 extern u32 booke_wdt_period;
720 
721 /* Checks wdt=x and wdt_period=xx command-line option */
722 notrace int __init early_parse_wdt(char *p)
723 {
724         if (p && strncmp(p, "", 1) != 0)
725                 booke_wdt_enabled = 1;
726 
727         return 0;
728 }
729 early_param("wdt", early_parse_wdt);
730 
731 int __init early_parse_wdt_period(char *p)
732 {
733         unsigned long ret;
734         if (p) {
735                 if (!kstrtol(p, 0, &ret))
736                         booke_wdt_period = ret;
737         }
738 
739         return 0;
740 }
741 early_param("wdt_period", early_parse_wdt_period);
742 #endif  /* CONFIG_BOOKE_WDT */
743 
744 void ppc_printk_progress(char *s, unsigned short hex)
745 {
746         pr_info("%s\n", s);
747 }
748 
749 void arch_setup_pdev_archdata(struct platform_device *pdev)
750 {
751         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
752         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
753         set_dma_ops(&pdev->dev, &dma_direct_ops);
754 }
755 

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