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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 #ifdef DEBUG
 66 #include <asm/udbg.h>
 67 #define DBG(fmt...) udbg_printf(fmt)
 68 #else
 69 #define DBG(fmt...)
 70 #endif
 71 
 72 /* The main machine-dep calls structure
 73  */
 74 struct machdep_calls ppc_md;
 75 EXPORT_SYMBOL(ppc_md);
 76 struct machdep_calls *machine_id;
 77 EXPORT_SYMBOL(machine_id);
 78 
 79 int boot_cpuid = -1;
 80 EXPORT_SYMBOL_GPL(boot_cpuid);
 81 
 82 unsigned long klimit = (unsigned long) _end;
 83 
 84 /*
 85  * This still seems to be needed... -- paulus
 86  */ 
 87 struct screen_info screen_info = {
 88         .orig_x = 0,
 89         .orig_y = 25,
 90         .orig_video_cols = 80,
 91         .orig_video_lines = 25,
 92         .orig_video_isVGA = 1,
 93         .orig_video_points = 16
 94 };
 95 #if defined(CONFIG_FB_VGA16_MODULE)
 96 EXPORT_SYMBOL(screen_info);
 97 #endif
 98 
 99 /* Variables required to store legacy IO irq routing */
100 int of_i8042_kbd_irq;
101 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
102 int of_i8042_aux_irq;
103 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
104 
105 #ifdef __DO_IRQ_CANON
106 /* XXX should go elsewhere eventually */
107 int ppc_do_canonicalize_irqs;
108 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
109 #endif
110 
111 /* also used by kexec */
112 void machine_shutdown(void)
113 {
114 #ifdef CONFIG_FA_DUMP
115         /*
116          * if fadump is active, cleanup the fadump registration before we
117          * shutdown.
118          */
119         fadump_cleanup();
120 #endif
121 
122         if (ppc_md.machine_shutdown)
123                 ppc_md.machine_shutdown();
124 }
125 
126 void machine_restart(char *cmd)
127 {
128         machine_shutdown();
129         if (ppc_md.restart)
130                 ppc_md.restart(cmd);
131 #ifdef CONFIG_SMP
132         smp_send_stop();
133 #endif
134         printk(KERN_EMERG "System Halted, OK to turn off power\n");
135         local_irq_disable();
136         while (1) ;
137 }
138 
139 void machine_power_off(void)
140 {
141         machine_shutdown();
142         if (pm_power_off)
143                 pm_power_off();
144 #ifdef CONFIG_SMP
145         smp_send_stop();
146 #endif
147         printk(KERN_EMERG "System Halted, OK to turn off power\n");
148         local_irq_disable();
149         while (1) ;
150 }
151 /* Used by the G5 thermal driver */
152 EXPORT_SYMBOL_GPL(machine_power_off);
153 
154 void (*pm_power_off)(void);
155 EXPORT_SYMBOL_GPL(pm_power_off);
156 
157 void machine_halt(void)
158 {
159         machine_shutdown();
160         if (ppc_md.halt)
161                 ppc_md.halt();
162 #ifdef CONFIG_SMP
163         smp_send_stop();
164 #endif
165         printk(KERN_EMERG "System Halted, OK to turn off power\n");
166         local_irq_disable();
167         while (1) ;
168 }
169 
170 
171 #ifdef CONFIG_TAU
172 extern u32 cpu_temp(unsigned long cpu);
173 extern u32 cpu_temp_both(unsigned long cpu);
174 #endif /* CONFIG_TAU */
175 
176 #ifdef CONFIG_SMP
177 DEFINE_PER_CPU(unsigned int, cpu_pvr);
178 #endif
179 
180 static void show_cpuinfo_summary(struct seq_file *m)
181 {
182         struct device_node *root;
183         const char *model = NULL;
184 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
185         unsigned long bogosum = 0;
186         int i;
187         for_each_online_cpu(i)
188                 bogosum += loops_per_jiffy;
189         seq_printf(m, "total bogomips\t: %lu.%02lu\n",
190                    bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
191 #endif /* CONFIG_SMP && CONFIG_PPC32 */
192         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
193         if (ppc_md.name)
194                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
195         root = of_find_node_by_path("/");
196         if (root)
197                 model = of_get_property(root, "model", NULL);
198         if (model)
199                 seq_printf(m, "model\t\t: %s\n", model);
200         of_node_put(root);
201 
202         if (ppc_md.show_cpuinfo != NULL)
203                 ppc_md.show_cpuinfo(m);
204 
205 #ifdef CONFIG_PPC32
206         /* Display the amount of memory */
207         seq_printf(m, "Memory\t\t: %d MB\n",
208                    (unsigned int)(total_memory / (1024 * 1024)));
209 #endif
210 }
211 
212 static int show_cpuinfo(struct seq_file *m, void *v)
213 {
214         unsigned long cpu_id = (unsigned long)v - 1;
215         unsigned int pvr;
216         unsigned long proc_freq;
217         unsigned short maj;
218         unsigned short min;
219 
220         /* We only show online cpus: disable preempt (overzealous, I
221          * knew) to prevent cpu going down. */
222         preempt_disable();
223         if (!cpu_online(cpu_id)) {
224                 preempt_enable();
225                 return 0;
226         }
227 
228 #ifdef CONFIG_SMP
229         pvr = per_cpu(cpu_pvr, cpu_id);
230 #else
231         pvr = mfspr(SPRN_PVR);
232 #endif
233         maj = (pvr >> 8) & 0xFF;
234         min = pvr & 0xFF;
235 
236         seq_printf(m, "processor\t: %lu\n", cpu_id);
237         seq_printf(m, "cpu\t\t: ");
238 
239         if (cur_cpu_spec->pvr_mask)
240                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
241         else
242                 seq_printf(m, "unknown (%08x)", pvr);
243 
244 #ifdef CONFIG_ALTIVEC
245         if (cpu_has_feature(CPU_FTR_ALTIVEC))
246                 seq_printf(m, ", altivec supported");
247 #endif /* CONFIG_ALTIVEC */
248 
249         seq_printf(m, "\n");
250 
251 #ifdef CONFIG_TAU
252         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
253 #ifdef CONFIG_TAU_AVERAGE
254                 /* more straightforward, but potentially misleading */
255                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
256                            cpu_temp(cpu_id));
257 #else
258                 /* show the actual temp sensor range */
259                 u32 temp;
260                 temp = cpu_temp_both(cpu_id);
261                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
262                            temp & 0xff, temp >> 16);
263 #endif
264         }
265 #endif /* CONFIG_TAU */
266 
267         /*
268          * Platforms that have variable clock rates, should implement
269          * the method ppc_md.get_proc_freq() that reports the clock
270          * rate of a given cpu. The rest can use ppc_proc_freq to
271          * report the clock rate that is same across all cpus.
272          */
273         if (ppc_md.get_proc_freq)
274                 proc_freq = ppc_md.get_proc_freq(cpu_id);
275         else
276                 proc_freq = ppc_proc_freq;
277 
278         if (proc_freq)
279                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
280                            proc_freq / 1000000, proc_freq % 1000000);
281 
282         if (ppc_md.show_percpuinfo != NULL)
283                 ppc_md.show_percpuinfo(m, cpu_id);
284 
285         /* If we are a Freescale core do a simple check so
286          * we dont have to keep adding cases in the future */
287         if (PVR_VER(pvr) & 0x8000) {
288                 switch (PVR_VER(pvr)) {
289                 case 0x8000:    /* 7441/7450/7451, Voyager */
290                 case 0x8001:    /* 7445/7455, Apollo 6 */
291                 case 0x8002:    /* 7447/7457, Apollo 7 */
292                 case 0x8003:    /* 7447A, Apollo 7 PM */
293                 case 0x8004:    /* 7448, Apollo 8 */
294                 case 0x800c:    /* 7410, Nitro */
295                         maj = ((pvr >> 8) & 0xF);
296                         min = PVR_MIN(pvr);
297                         break;
298                 default:        /* e500/book-e */
299                         maj = PVR_MAJ(pvr);
300                         min = PVR_MIN(pvr);
301                         break;
302                 }
303         } else {
304                 switch (PVR_VER(pvr)) {
305                         case 0x0020:    /* 403 family */
306                                 maj = PVR_MAJ(pvr) + 1;
307                                 min = PVR_MIN(pvr);
308                                 break;
309                         case 0x1008:    /* 740P/750P ?? */
310                                 maj = ((pvr >> 8) & 0xFF) - 1;
311                                 min = pvr & 0xFF;
312                                 break;
313                         default:
314                                 maj = (pvr >> 8) & 0xFF;
315                                 min = pvr & 0xFF;
316                                 break;
317                 }
318         }
319 
320         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
321                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
322 
323 #ifdef CONFIG_PPC32
324         seq_printf(m, "bogomips\t: %lu.%02lu\n",
325                    loops_per_jiffy / (500000/HZ),
326                    (loops_per_jiffy / (5000/HZ)) % 100);
327 #endif
328 
329 #ifdef CONFIG_SMP
330         seq_printf(m, "\n");
331 #endif
332 
333         preempt_enable();
334 
335         /* If this is the last cpu, print the summary */
336         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
337                 show_cpuinfo_summary(m);
338 
339         return 0;
340 }
341 
342 static void *c_start(struct seq_file *m, loff_t *pos)
343 {
344         if (*pos == 0)  /* just in case, cpu 0 is not the first */
345                 *pos = cpumask_first(cpu_online_mask);
346         else
347                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
348         if ((*pos) < nr_cpu_ids)
349                 return (void *)(unsigned long)(*pos + 1);
350         return NULL;
351 }
352 
353 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
354 {
355         (*pos)++;
356         return c_start(m, pos);
357 }
358 
359 static void c_stop(struct seq_file *m, void *v)
360 {
361 }
362 
363 const struct seq_operations cpuinfo_op = {
364         .start =c_start,
365         .next = c_next,
366         .stop = c_stop,
367         .show = show_cpuinfo,
368 };
369 
370 void __init check_for_initrd(void)
371 {
372 #ifdef CONFIG_BLK_DEV_INITRD
373         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
374             initrd_start, initrd_end);
375 
376         /* If we were passed an initrd, set the ROOT_DEV properly if the values
377          * look sensible. If not, clear initrd reference.
378          */
379         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
380             initrd_end > initrd_start)
381                 ROOT_DEV = Root_RAM0;
382         else
383                 initrd_start = initrd_end = 0;
384 
385         if (initrd_start)
386                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
387 
388         DBG(" <- check_for_initrd()\n");
389 #endif /* CONFIG_BLK_DEV_INITRD */
390 }
391 
392 #ifdef CONFIG_SMP
393 
394 int threads_per_core, threads_per_subcore, threads_shift;
395 cpumask_t threads_core_mask;
396 EXPORT_SYMBOL_GPL(threads_per_core);
397 EXPORT_SYMBOL_GPL(threads_per_subcore);
398 EXPORT_SYMBOL_GPL(threads_shift);
399 EXPORT_SYMBOL_GPL(threads_core_mask);
400 
401 static void __init cpu_init_thread_core_maps(int tpc)
402 {
403         int i;
404 
405         threads_per_core = tpc;
406         threads_per_subcore = tpc;
407         cpumask_clear(&threads_core_mask);
408 
409         /* This implementation only supports power of 2 number of threads
410          * for simplicity and performance
411          */
412         threads_shift = ilog2(tpc);
413         BUG_ON(tpc != (1 << threads_shift));
414 
415         for (i = 0; i < tpc; i++)
416                 cpumask_set_cpu(i, &threads_core_mask);
417 
418         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
419                tpc, tpc > 1 ? "s" : "");
420         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
421 }
422 
423 
424 /**
425  * setup_cpu_maps - initialize the following cpu maps:
426  *                  cpu_possible_mask
427  *                  cpu_present_mask
428  *
429  * Having the possible map set up early allows us to restrict allocations
430  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
431  *
432  * We do not initialize the online map here; cpus set their own bits in
433  * cpu_online_mask as they come up.
434  *
435  * This function is valid only for Open Firmware systems.  finish_device_tree
436  * must be called before using this.
437  *
438  * While we're here, we may as well set the "physical" cpu ids in the paca.
439  *
440  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
441  */
442 void __init smp_setup_cpu_maps(void)
443 {
444         struct device_node *dn = NULL;
445         int cpu = 0;
446         int nthreads = 1;
447 
448         DBG("smp_setup_cpu_maps()\n");
449 
450         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
451                 const __be32 *intserv;
452                 __be32 cpu_be;
453                 int j, len;
454 
455                 DBG("  * %s...\n", dn->full_name);
456 
457                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
458                                 &len);
459                 if (intserv) {
460                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
461                             nthreads);
462                 } else {
463                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
464                         intserv = of_get_property(dn, "reg", &len);
465                         if (!intserv) {
466                                 cpu_be = cpu_to_be32(cpu);
467                                 intserv = &cpu_be;      /* assume logical == phys */
468                                 len = 4;
469                         }
470                 }
471 
472                 nthreads = len / sizeof(int);
473 
474                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
475                         bool avail;
476 
477                         DBG("    thread %d -> cpu %d (hard id %d)\n",
478                             j, cpu, be32_to_cpu(intserv[j]));
479 
480                         avail = of_device_is_available(dn);
481                         if (!avail)
482                                 avail = !of_property_match_string(dn,
483                                                 "enable-method", "spin-table");
484 
485                         set_cpu_present(cpu, avail);
486                         set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
487                         set_cpu_possible(cpu, true);
488                         cpu++;
489                 }
490         }
491 
492         /* If no SMT supported, nthreads is forced to 1 */
493         if (!cpu_has_feature(CPU_FTR_SMT)) {
494                 DBG("  SMT disabled ! nthreads forced to 1\n");
495                 nthreads = 1;
496         }
497 
498 #ifdef CONFIG_PPC64
499         /*
500          * On pSeries LPAR, we need to know how many cpus
501          * could possibly be added to this partition.
502          */
503         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
504             (dn = of_find_node_by_path("/rtas"))) {
505                 int num_addr_cell, num_size_cell, maxcpus;
506                 const __be32 *ireg;
507 
508                 num_addr_cell = of_n_addr_cells(dn);
509                 num_size_cell = of_n_size_cells(dn);
510 
511                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
512 
513                 if (!ireg)
514                         goto out;
515 
516                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
517 
518                 /* Double maxcpus for processors which have SMT capability */
519                 if (cpu_has_feature(CPU_FTR_SMT))
520                         maxcpus *= nthreads;
521 
522                 if (maxcpus > nr_cpu_ids) {
523                         printk(KERN_WARNING
524                                "Partition configured for %d cpus, "
525                                "operating system maximum is %d.\n",
526                                maxcpus, nr_cpu_ids);
527                         maxcpus = nr_cpu_ids;
528                 } else
529                         printk(KERN_INFO "Partition configured for %d cpus.\n",
530                                maxcpus);
531 
532                 for (cpu = 0; cpu < maxcpus; cpu++)
533                         set_cpu_possible(cpu, true);
534         out:
535                 of_node_put(dn);
536         }
537         vdso_data->processorCount = num_present_cpus();
538 #endif /* CONFIG_PPC64 */
539 
540         /* Initialize CPU <=> thread mapping/
541          *
542          * WARNING: We assume that the number of threads is the same for
543          * every CPU in the system. If that is not the case, then some code
544          * here will have to be reworked
545          */
546         cpu_init_thread_core_maps(nthreads);
547 
548         /* Now that possible cpus are set, set nr_cpu_ids for later use */
549         setup_nr_cpu_ids();
550 
551         free_unused_pacas();
552 }
553 #endif /* CONFIG_SMP */
554 
555 #ifdef CONFIG_PCSPKR_PLATFORM
556 static __init int add_pcspkr(void)
557 {
558         struct device_node *np;
559         struct platform_device *pd;
560         int ret;
561 
562         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
563         of_node_put(np);
564         if (!np)
565                 return -ENODEV;
566 
567         pd = platform_device_alloc("pcspkr", -1);
568         if (!pd)
569                 return -ENOMEM;
570 
571         ret = platform_device_add(pd);
572         if (ret)
573                 platform_device_put(pd);
574 
575         return ret;
576 }
577 device_initcall(add_pcspkr);
578 #endif  /* CONFIG_PCSPKR_PLATFORM */
579 
580 void probe_machine(void)
581 {
582         extern struct machdep_calls __machine_desc_start;
583         extern struct machdep_calls __machine_desc_end;
584 
585         /*
586          * Iterate all ppc_md structures until we find the proper
587          * one for the current machine type
588          */
589         DBG("Probing machine type ...\n");
590 
591         for (machine_id = &__machine_desc_start;
592              machine_id < &__machine_desc_end;
593              machine_id++) {
594                 DBG("  %s ...", machine_id->name);
595                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
596                 if (ppc_md.probe()) {
597                         DBG(" match !\n");
598                         break;
599                 }
600                 DBG("\n");
601         }
602         /* What can we do if we didn't find ? */
603         if (machine_id >= &__machine_desc_end) {
604                 DBG("No suitable machine found !\n");
605                 for (;;);
606         }
607 
608         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
609 }
610 
611 /* Match a class of boards, not a specific device configuration. */
612 int check_legacy_ioport(unsigned long base_port)
613 {
614         struct device_node *parent, *np = NULL;
615         int ret = -ENODEV;
616 
617         switch(base_port) {
618         case I8042_DATA_REG:
619                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
620                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
621                 if (np) {
622                         parent = of_get_parent(np);
623 
624                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
625                         if (!of_i8042_kbd_irq)
626                                 of_i8042_kbd_irq = 1;
627 
628                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
629                         if (!of_i8042_aux_irq)
630                                 of_i8042_aux_irq = 12;
631 
632                         of_node_put(np);
633                         np = parent;
634                         break;
635                 }
636                 np = of_find_node_by_type(NULL, "8042");
637                 /* Pegasos has no device_type on its 8042 node, look for the
638                  * name instead */
639                 if (!np)
640                         np = of_find_node_by_name(NULL, "8042");
641                 if (np) {
642                         of_i8042_kbd_irq = 1;
643                         of_i8042_aux_irq = 12;
644                 }
645                 break;
646         case FDC_BASE: /* FDC1 */
647                 np = of_find_node_by_type(NULL, "fdc");
648                 break;
649         default:
650                 /* ipmi is supposed to fail here */
651                 break;
652         }
653         if (!np)
654                 return ret;
655         parent = of_get_parent(np);
656         if (parent) {
657                 if (strcmp(parent->type, "isa") == 0)
658                         ret = 0;
659                 of_node_put(parent);
660         }
661         of_node_put(np);
662         return ret;
663 }
664 EXPORT_SYMBOL(check_legacy_ioport);
665 
666 static int ppc_panic_event(struct notifier_block *this,
667                              unsigned long event, void *ptr)
668 {
669         /*
670          * If firmware-assisted dump has been registered then trigger
671          * firmware-assisted dump and let firmware handle everything else.
672          */
673         crash_fadump(NULL, ptr);
674         ppc_md.panic(ptr);  /* May not return */
675         return NOTIFY_DONE;
676 }
677 
678 static struct notifier_block ppc_panic_block = {
679         .notifier_call = ppc_panic_event,
680         .priority = INT_MIN /* may not return; must be done last */
681 };
682 
683 void __init setup_panic(void)
684 {
685         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
686 }
687 
688 #ifdef CONFIG_CHECK_CACHE_COHERENCY
689 /*
690  * For platforms that have configurable cache-coherency.  This function
691  * checks that the cache coherency setting of the kernel matches the setting
692  * left by the firmware, as indicated in the device tree.  Since a mismatch
693  * will eventually result in DMA failures, we print * and error and call
694  * BUG() in that case.
695  */
696 
697 #ifdef CONFIG_NOT_COHERENT_CACHE
698 #define KERNEL_COHERENCY        0
699 #else
700 #define KERNEL_COHERENCY        1
701 #endif
702 
703 static int __init check_cache_coherency(void)
704 {
705         struct device_node *np;
706         const void *prop;
707         int devtree_coherency;
708 
709         np = of_find_node_by_path("/");
710         prop = of_get_property(np, "coherency-off", NULL);
711         of_node_put(np);
712 
713         devtree_coherency = prop ? 0 : 1;
714 
715         if (devtree_coherency != KERNEL_COHERENCY) {
716                 printk(KERN_ERR
717                         "kernel coherency:%s != device tree_coherency:%s\n",
718                         KERNEL_COHERENCY ? "on" : "off",
719                         devtree_coherency ? "on" : "off");
720                 BUG();
721         }
722 
723         return 0;
724 }
725 
726 late_initcall(check_cache_coherency);
727 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
728 
729 #ifdef CONFIG_DEBUG_FS
730 struct dentry *powerpc_debugfs_root;
731 EXPORT_SYMBOL(powerpc_debugfs_root);
732 
733 static int powerpc_debugfs_init(void)
734 {
735         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
736 
737         return powerpc_debugfs_root == NULL;
738 }
739 arch_initcall(powerpc_debugfs_init);
740 #endif
741 
742 void ppc_printk_progress(char *s, unsigned short hex)
743 {
744         pr_info("%s\n", s);
745 }
746 
747 void arch_setup_pdev_archdata(struct platform_device *pdev)
748 {
749         pdev->archdata.dma_mask = DMA_BIT_MASK(32);
750         pdev->dev.dma_mask = &pdev->archdata.dma_mask;
751         set_dma_ops(&pdev->dev, &dma_direct_ops);
752 }
753 

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