efivars: Refactor sanity checking code into separate function
[linux/fpc-iii.git] / arch / powerpc / kernel / setup-common.c
blob79b7612ac6fa34f7e1d77c1db95f399f7be3bcc1
1 /*
2 * Common boot and setup code for both 32-bit and 64-bit.
3 * Extracted from arch/powerpc/kernel/setup_64.c.
5 * Copyright (C) 2001 PPC64 Team, IBM Corp
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.
13 #undef DEBUG
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>
65 #ifdef DEBUG
66 #include <asm/udbg.h>
67 #define DBG(fmt...) udbg_printf(fmt)
68 #else
69 #define DBG(fmt...)
70 #endif
72 /* The main machine-dep calls structure
74 struct machdep_calls ppc_md;
75 EXPORT_SYMBOL(ppc_md);
76 struct machdep_calls *machine_id;
77 EXPORT_SYMBOL(machine_id);
79 int boot_cpuid = -1;
80 EXPORT_SYMBOL_GPL(boot_cpuid);
82 unsigned long klimit = (unsigned long) _end;
84 char cmd_line[COMMAND_LINE_SIZE];
87 * This still seems to be needed... -- paulus
88 */
89 struct screen_info screen_info = {
90 .orig_x = 0,
91 .orig_y = 25,
92 .orig_video_cols = 80,
93 .orig_video_lines = 25,
94 .orig_video_isVGA = 1,
95 .orig_video_points = 16
98 /* Variables required to store legacy IO irq routing */
99 int of_i8042_kbd_irq;
100 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
101 int of_i8042_aux_irq;
102 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
104 #ifdef __DO_IRQ_CANON
105 /* XXX should go elsewhere eventually */
106 int ppc_do_canonicalize_irqs;
107 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
108 #endif
110 /* also used by kexec */
111 void machine_shutdown(void)
113 #ifdef CONFIG_FA_DUMP
115 * if fadump is active, cleanup the fadump registration before we
116 * shutdown.
118 fadump_cleanup();
119 #endif
121 if (ppc_md.machine_shutdown)
122 ppc_md.machine_shutdown();
125 void machine_restart(char *cmd)
127 machine_shutdown();
128 if (ppc_md.restart)
129 ppc_md.restart(cmd);
130 #ifdef CONFIG_SMP
131 smp_send_stop();
132 #endif
133 printk(KERN_EMERG "System Halted, OK to turn off power\n");
134 local_irq_disable();
135 while (1) ;
138 void machine_power_off(void)
140 machine_shutdown();
141 if (ppc_md.power_off)
142 ppc_md.power_off();
143 #ifdef CONFIG_SMP
144 smp_send_stop();
145 #endif
146 printk(KERN_EMERG "System Halted, OK to turn off power\n");
147 local_irq_disable();
148 while (1) ;
150 /* Used by the G5 thermal driver */
151 EXPORT_SYMBOL_GPL(machine_power_off);
153 void (*pm_power_off)(void) = machine_power_off;
154 EXPORT_SYMBOL_GPL(pm_power_off);
156 void machine_halt(void)
158 machine_shutdown();
159 if (ppc_md.halt)
160 ppc_md.halt();
161 #ifdef CONFIG_SMP
162 smp_send_stop();
163 #endif
164 printk(KERN_EMERG "System Halted, OK to turn off power\n");
165 local_irq_disable();
166 while (1) ;
170 #ifdef CONFIG_TAU
171 extern u32 cpu_temp(unsigned long cpu);
172 extern u32 cpu_temp_both(unsigned long cpu);
173 #endif /* CONFIG_TAU */
175 #ifdef CONFIG_SMP
176 DEFINE_PER_CPU(unsigned int, cpu_pvr);
177 #endif
179 static void show_cpuinfo_summary(struct seq_file *m)
181 struct device_node *root;
182 const char *model = NULL;
183 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
184 unsigned long bogosum = 0;
185 int i;
186 for_each_online_cpu(i)
187 bogosum += loops_per_jiffy;
188 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
189 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
190 #endif /* CONFIG_SMP && CONFIG_PPC32 */
191 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
192 if (ppc_md.name)
193 seq_printf(m, "platform\t: %s\n", ppc_md.name);
194 root = of_find_node_by_path("/");
195 if (root)
196 model = of_get_property(root, "model", NULL);
197 if (model)
198 seq_printf(m, "model\t\t: %s\n", model);
199 of_node_put(root);
201 if (ppc_md.show_cpuinfo != NULL)
202 ppc_md.show_cpuinfo(m);
204 #ifdef CONFIG_PPC32
205 /* Display the amount of memory */
206 seq_printf(m, "Memory\t\t: %d MB\n",
207 (unsigned int)(total_memory / (1024 * 1024)));
208 #endif
211 static int show_cpuinfo(struct seq_file *m, void *v)
213 unsigned long cpu_id = (unsigned long)v - 1;
214 unsigned int pvr;
215 unsigned short maj;
216 unsigned short min;
218 /* We only show online cpus: disable preempt (overzealous, I
219 * knew) to prevent cpu going down. */
220 preempt_disable();
221 if (!cpu_online(cpu_id)) {
222 preempt_enable();
223 return 0;
226 #ifdef CONFIG_SMP
227 pvr = per_cpu(cpu_pvr, cpu_id);
228 #else
229 pvr = mfspr(SPRN_PVR);
230 #endif
231 maj = (pvr >> 8) & 0xFF;
232 min = pvr & 0xFF;
234 seq_printf(m, "processor\t: %lu\n", cpu_id);
235 seq_printf(m, "cpu\t\t: ");
237 if (cur_cpu_spec->pvr_mask)
238 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
239 else
240 seq_printf(m, "unknown (%08x)", pvr);
242 #ifdef CONFIG_ALTIVEC
243 if (cpu_has_feature(CPU_FTR_ALTIVEC))
244 seq_printf(m, ", altivec supported");
245 #endif /* CONFIG_ALTIVEC */
247 seq_printf(m, "\n");
249 #ifdef CONFIG_TAU
250 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
251 #ifdef CONFIG_TAU_AVERAGE
252 /* more straightforward, but potentially misleading */
253 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
254 cpu_temp(cpu_id));
255 #else
256 /* show the actual temp sensor range */
257 u32 temp;
258 temp = cpu_temp_both(cpu_id);
259 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
260 temp & 0xff, temp >> 16);
261 #endif
263 #endif /* CONFIG_TAU */
266 * Assume here that all clock rates are the same in a
267 * smp system. -- Cort
269 if (ppc_proc_freq)
270 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
271 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
273 if (ppc_md.show_percpuinfo != NULL)
274 ppc_md.show_percpuinfo(m, cpu_id);
276 /* If we are a Freescale core do a simple check so
277 * we dont have to keep adding cases in the future */
278 if (PVR_VER(pvr) & 0x8000) {
279 switch (PVR_VER(pvr)) {
280 case 0x8000: /* 7441/7450/7451, Voyager */
281 case 0x8001: /* 7445/7455, Apollo 6 */
282 case 0x8002: /* 7447/7457, Apollo 7 */
283 case 0x8003: /* 7447A, Apollo 7 PM */
284 case 0x8004: /* 7448, Apollo 8 */
285 case 0x800c: /* 7410, Nitro */
286 maj = ((pvr >> 8) & 0xF);
287 min = PVR_MIN(pvr);
288 break;
289 default: /* e500/book-e */
290 maj = PVR_MAJ(pvr);
291 min = PVR_MIN(pvr);
292 break;
294 } else {
295 switch (PVR_VER(pvr)) {
296 case 0x0020: /* 403 family */
297 maj = PVR_MAJ(pvr) + 1;
298 min = PVR_MIN(pvr);
299 break;
300 case 0x1008: /* 740P/750P ?? */
301 maj = ((pvr >> 8) & 0xFF) - 1;
302 min = pvr & 0xFF;
303 break;
304 default:
305 maj = (pvr >> 8) & 0xFF;
306 min = pvr & 0xFF;
307 break;
311 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
312 maj, min, PVR_VER(pvr), PVR_REV(pvr));
314 #ifdef CONFIG_PPC32
315 seq_printf(m, "bogomips\t: %lu.%02lu\n",
316 loops_per_jiffy / (500000/HZ),
317 (loops_per_jiffy / (5000/HZ)) % 100);
318 #endif
320 #ifdef CONFIG_SMP
321 seq_printf(m, "\n");
322 #endif
324 preempt_enable();
326 /* If this is the last cpu, print the summary */
327 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
328 show_cpuinfo_summary(m);
330 return 0;
333 static void *c_start(struct seq_file *m, loff_t *pos)
335 if (*pos == 0) /* just in case, cpu 0 is not the first */
336 *pos = cpumask_first(cpu_online_mask);
337 else
338 *pos = cpumask_next(*pos - 1, cpu_online_mask);
339 if ((*pos) < nr_cpu_ids)
340 return (void *)(unsigned long)(*pos + 1);
341 return NULL;
344 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
346 (*pos)++;
347 return c_start(m, pos);
350 static void c_stop(struct seq_file *m, void *v)
354 const struct seq_operations cpuinfo_op = {
355 .start =c_start,
356 .next = c_next,
357 .stop = c_stop,
358 .show = show_cpuinfo,
361 void __init check_for_initrd(void)
363 #ifdef CONFIG_BLK_DEV_INITRD
364 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
365 initrd_start, initrd_end);
367 /* If we were passed an initrd, set the ROOT_DEV properly if the values
368 * look sensible. If not, clear initrd reference.
370 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
371 initrd_end > initrd_start)
372 ROOT_DEV = Root_RAM0;
373 else
374 initrd_start = initrd_end = 0;
376 if (initrd_start)
377 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
379 DBG(" <- check_for_initrd()\n");
380 #endif /* CONFIG_BLK_DEV_INITRD */
383 #ifdef CONFIG_SMP
385 int threads_per_core, threads_shift;
386 cpumask_t threads_core_mask;
387 EXPORT_SYMBOL_GPL(threads_per_core);
388 EXPORT_SYMBOL_GPL(threads_shift);
389 EXPORT_SYMBOL_GPL(threads_core_mask);
391 static void __init cpu_init_thread_core_maps(int tpc)
393 int i;
395 threads_per_core = tpc;
396 cpumask_clear(&threads_core_mask);
398 /* This implementation only supports power of 2 number of threads
399 * for simplicity and performance
401 threads_shift = ilog2(tpc);
402 BUG_ON(tpc != (1 << threads_shift));
404 for (i = 0; i < tpc; i++)
405 cpumask_set_cpu(i, &threads_core_mask);
407 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
408 tpc, tpc > 1 ? "s" : "");
409 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
414 * setup_cpu_maps - initialize the following cpu maps:
415 * cpu_possible_mask
416 * cpu_present_mask
418 * Having the possible map set up early allows us to restrict allocations
419 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
421 * We do not initialize the online map here; cpus set their own bits in
422 * cpu_online_mask as they come up.
424 * This function is valid only for Open Firmware systems. finish_device_tree
425 * must be called before using this.
427 * While we're here, we may as well set the "physical" cpu ids in the paca.
429 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
431 void __init smp_setup_cpu_maps(void)
433 struct device_node *dn = NULL;
434 int cpu = 0;
435 int nthreads = 1;
437 DBG("smp_setup_cpu_maps()\n");
439 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
440 const __be32 *intserv;
441 __be32 cpu_be;
442 int j, len;
444 DBG(" * %s...\n", dn->full_name);
446 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
447 &len);
448 if (intserv) {
449 nthreads = len / sizeof(int);
450 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
451 nthreads);
452 } else {
453 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
454 intserv = of_get_property(dn, "reg", NULL);
455 if (!intserv) {
456 cpu_be = cpu_to_be32(cpu);
457 intserv = &cpu_be; /* assume logical == phys */
461 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
462 DBG(" thread %d -> cpu %d (hard id %d)\n",
463 j, cpu, be32_to_cpu(intserv[j]));
464 set_cpu_present(cpu, true);
465 set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
466 set_cpu_possible(cpu, true);
467 cpu++;
471 /* If no SMT supported, nthreads is forced to 1 */
472 if (!cpu_has_feature(CPU_FTR_SMT)) {
473 DBG(" SMT disabled ! nthreads forced to 1\n");
474 nthreads = 1;
477 #ifdef CONFIG_PPC64
479 * On pSeries LPAR, we need to know how many cpus
480 * could possibly be added to this partition.
482 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
483 (dn = of_find_node_by_path("/rtas"))) {
484 int num_addr_cell, num_size_cell, maxcpus;
485 const __be32 *ireg;
487 num_addr_cell = of_n_addr_cells(dn);
488 num_size_cell = of_n_size_cells(dn);
490 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
492 if (!ireg)
493 goto out;
495 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
497 /* Double maxcpus for processors which have SMT capability */
498 if (cpu_has_feature(CPU_FTR_SMT))
499 maxcpus *= nthreads;
501 if (maxcpus > nr_cpu_ids) {
502 printk(KERN_WARNING
503 "Partition configured for %d cpus, "
504 "operating system maximum is %d.\n",
505 maxcpus, nr_cpu_ids);
506 maxcpus = nr_cpu_ids;
507 } else
508 printk(KERN_INFO "Partition configured for %d cpus.\n",
509 maxcpus);
511 for (cpu = 0; cpu < maxcpus; cpu++)
512 set_cpu_possible(cpu, true);
513 out:
514 of_node_put(dn);
516 vdso_data->processorCount = num_present_cpus();
517 #endif /* CONFIG_PPC64 */
519 /* Initialize CPU <=> thread mapping/
521 * WARNING: We assume that the number of threads is the same for
522 * every CPU in the system. If that is not the case, then some code
523 * here will have to be reworked
525 cpu_init_thread_core_maps(nthreads);
527 /* Now that possible cpus are set, set nr_cpu_ids for later use */
528 setup_nr_cpu_ids();
530 free_unused_pacas();
532 #endif /* CONFIG_SMP */
534 #ifdef CONFIG_PCSPKR_PLATFORM
535 static __init int add_pcspkr(void)
537 struct device_node *np;
538 struct platform_device *pd;
539 int ret;
541 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
542 of_node_put(np);
543 if (!np)
544 return -ENODEV;
546 pd = platform_device_alloc("pcspkr", -1);
547 if (!pd)
548 return -ENOMEM;
550 ret = platform_device_add(pd);
551 if (ret)
552 platform_device_put(pd);
554 return ret;
556 device_initcall(add_pcspkr);
557 #endif /* CONFIG_PCSPKR_PLATFORM */
559 void probe_machine(void)
561 extern struct machdep_calls __machine_desc_start;
562 extern struct machdep_calls __machine_desc_end;
565 * Iterate all ppc_md structures until we find the proper
566 * one for the current machine type
568 DBG("Probing machine type ...\n");
570 for (machine_id = &__machine_desc_start;
571 machine_id < &__machine_desc_end;
572 machine_id++) {
573 DBG(" %s ...", machine_id->name);
574 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
575 if (ppc_md.probe()) {
576 DBG(" match !\n");
577 break;
579 DBG("\n");
581 /* What can we do if we didn't find ? */
582 if (machine_id >= &__machine_desc_end) {
583 DBG("No suitable machine found !\n");
584 for (;;);
587 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
590 /* Match a class of boards, not a specific device configuration. */
591 int check_legacy_ioport(unsigned long base_port)
593 struct device_node *parent, *np = NULL;
594 int ret = -ENODEV;
596 switch(base_port) {
597 case I8042_DATA_REG:
598 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
599 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
600 if (np) {
601 parent = of_get_parent(np);
603 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
604 if (!of_i8042_kbd_irq)
605 of_i8042_kbd_irq = 1;
607 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
608 if (!of_i8042_aux_irq)
609 of_i8042_aux_irq = 12;
611 of_node_put(np);
612 np = parent;
613 break;
615 np = of_find_node_by_type(NULL, "8042");
616 /* Pegasos has no device_type on its 8042 node, look for the
617 * name instead */
618 if (!np)
619 np = of_find_node_by_name(NULL, "8042");
620 if (np) {
621 of_i8042_kbd_irq = 1;
622 of_i8042_aux_irq = 12;
624 break;
625 case FDC_BASE: /* FDC1 */
626 np = of_find_node_by_type(NULL, "fdc");
627 break;
628 default:
629 /* ipmi is supposed to fail here */
630 break;
632 if (!np)
633 return ret;
634 parent = of_get_parent(np);
635 if (parent) {
636 if (strcmp(parent->type, "isa") == 0)
637 ret = 0;
638 of_node_put(parent);
640 of_node_put(np);
641 return ret;
643 EXPORT_SYMBOL(check_legacy_ioport);
645 static int ppc_panic_event(struct notifier_block *this,
646 unsigned long event, void *ptr)
649 * If firmware-assisted dump has been registered then trigger
650 * firmware-assisted dump and let firmware handle everything else.
652 crash_fadump(NULL, ptr);
653 ppc_md.panic(ptr); /* May not return */
654 return NOTIFY_DONE;
657 static struct notifier_block ppc_panic_block = {
658 .notifier_call = ppc_panic_event,
659 .priority = INT_MIN /* may not return; must be done last */
662 void __init setup_panic(void)
664 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
667 #ifdef CONFIG_CHECK_CACHE_COHERENCY
669 * For platforms that have configurable cache-coherency. This function
670 * checks that the cache coherency setting of the kernel matches the setting
671 * left by the firmware, as indicated in the device tree. Since a mismatch
672 * will eventually result in DMA failures, we print * and error and call
673 * BUG() in that case.
676 #ifdef CONFIG_NOT_COHERENT_CACHE
677 #define KERNEL_COHERENCY 0
678 #else
679 #define KERNEL_COHERENCY 1
680 #endif
682 static int __init check_cache_coherency(void)
684 struct device_node *np;
685 const void *prop;
686 int devtree_coherency;
688 np = of_find_node_by_path("/");
689 prop = of_get_property(np, "coherency-off", NULL);
690 of_node_put(np);
692 devtree_coherency = prop ? 0 : 1;
694 if (devtree_coherency != KERNEL_COHERENCY) {
695 printk(KERN_ERR
696 "kernel coherency:%s != device tree_coherency:%s\n",
697 KERNEL_COHERENCY ? "on" : "off",
698 devtree_coherency ? "on" : "off");
699 BUG();
702 return 0;
705 late_initcall(check_cache_coherency);
706 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
708 #ifdef CONFIG_DEBUG_FS
709 struct dentry *powerpc_debugfs_root;
710 EXPORT_SYMBOL(powerpc_debugfs_root);
712 static int powerpc_debugfs_init(void)
714 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
716 return powerpc_debugfs_root == NULL;
718 arch_initcall(powerpc_debugfs_init);
719 #endif
721 #ifdef CONFIG_BOOKE_WDT
722 extern u32 booke_wdt_enabled;
723 extern u32 booke_wdt_period;
725 /* Checks wdt=x and wdt_period=xx command-line option */
726 notrace int __init early_parse_wdt(char *p)
728 if (p && strncmp(p, "0", 1) != 0)
729 booke_wdt_enabled = 1;
731 return 0;
733 early_param("wdt", early_parse_wdt);
735 int __init early_parse_wdt_period(char *p)
737 unsigned long ret;
738 if (p) {
739 if (!kstrtol(p, 0, &ret))
740 booke_wdt_period = ret;
743 return 0;
745 early_param("wdt_period", early_parse_wdt_period);
746 #endif /* CONFIG_BOOKE_WDT */
748 void ppc_printk_progress(char *s, unsigned short hex)
750 pr_info("%s\n", s);
753 void arch_setup_pdev_archdata(struct platform_device *pdev)
755 pdev->archdata.dma_mask = DMA_BIT_MASK(32);
756 pdev->dev.dma_mask = &pdev->archdata.dma_mask;
757 set_dma_ops(&pdev->dev, &dma_direct_ops);