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.
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>
41 #include <asm/processor.h>
42 #include <asm/vdso_datapage.h>
43 #include <asm/pgtable.h>
46 #include <asm/machdep.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>
55 #include <asm/iommu.h>
56 #include <asm/serial.h>
57 #include <asm/cache.h>
61 #include <asm/cputhreads.h>
62 #include <mm/mmu_decl.h>
63 #include <asm/fadump.h>
67 #define DBG(fmt...) udbg_printf(fmt)
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);
80 EXPORT_SYMBOL_GPL(boot_cpuid);
82 unsigned long klimit = (unsigned long) _end;
85 * This still seems to be needed... -- paulus
87 struct screen_info screen_info = {
90 .orig_video_cols = 80,
91 .orig_video_lines = 25,
92 .orig_video_isVGA = 1,
93 .orig_video_points = 16
95 #if defined(CONFIG_FB_VGA16_MODULE)
96 EXPORT_SYMBOL(screen_info);
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);
105 #ifdef __DO_IRQ_CANON
106 /* XXX should go elsewhere eventually */
107 int ppc_do_canonicalize_irqs;
108 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
111 /* also used by kexec */
112 void machine_shutdown(void)
114 #ifdef CONFIG_FA_DUMP
116 * if fadump is active, cleanup the fadump registration before we
122 if (ppc_md.machine_shutdown)
123 ppc_md.machine_shutdown();
126 void machine_restart(char *cmd)
132 printk(KERN_EMERG "System Halted, OK to turn off power\n");
137 void machine_power_off(void)
143 printk(KERN_EMERG "System Halted, OK to turn off power\n");
147 /* Used by the G5 thermal driver */
148 EXPORT_SYMBOL_GPL(machine_power_off);
150 void (*pm_power_off)(void);
151 EXPORT_SYMBOL_GPL(pm_power_off);
153 void machine_halt(void)
159 printk(KERN_EMERG "System Halted, OK to turn off power\n");
166 extern u32 cpu_temp(unsigned long cpu);
167 extern u32 cpu_temp_both(unsigned long cpu);
168 #endif /* CONFIG_TAU */
171 DEFINE_PER_CPU(unsigned int, cpu_pvr);
174 static void show_cpuinfo_summary(struct seq_file *m)
176 struct device_node *root;
177 const char *model = NULL;
178 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
179 unsigned long bogosum = 0;
181 for_each_online_cpu(i)
182 bogosum += loops_per_jiffy;
183 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
184 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
185 #endif /* CONFIG_SMP && CONFIG_PPC32 */
186 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
188 seq_printf(m, "platform\t: %s\n", ppc_md.name);
189 root = of_find_node_by_path("/");
191 model = of_get_property(root, "model", NULL);
193 seq_printf(m, "model\t\t: %s\n", model);
196 if (ppc_md.show_cpuinfo != NULL)
197 ppc_md.show_cpuinfo(m);
200 /* Display the amount of memory */
201 seq_printf(m, "Memory\t\t: %d MB\n",
202 (unsigned int)(total_memory / (1024 * 1024)));
206 static int show_cpuinfo(struct seq_file *m, void *v)
208 unsigned long cpu_id = (unsigned long)v - 1;
210 unsigned long proc_freq;
214 /* We only show online cpus: disable preempt (overzealous, I
215 * knew) to prevent cpu going down. */
217 if (!cpu_online(cpu_id)) {
223 pvr = per_cpu(cpu_pvr, cpu_id);
225 pvr = mfspr(SPRN_PVR);
227 maj = (pvr >> 8) & 0xFF;
230 seq_printf(m, "processor\t: %lu\n", cpu_id);
231 seq_printf(m, "cpu\t\t: ");
233 if (cur_cpu_spec->pvr_mask)
234 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
236 seq_printf(m, "unknown (%08x)", pvr);
238 #ifdef CONFIG_ALTIVEC
239 if (cpu_has_feature(CPU_FTR_ALTIVEC))
240 seq_printf(m, ", altivec supported");
241 #endif /* CONFIG_ALTIVEC */
246 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
247 #ifdef CONFIG_TAU_AVERAGE
248 /* more straightforward, but potentially misleading */
249 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
252 /* show the actual temp sensor range */
254 temp = cpu_temp_both(cpu_id);
255 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
256 temp & 0xff, temp >> 16);
259 #endif /* CONFIG_TAU */
262 * Platforms that have variable clock rates, should implement
263 * the method ppc_md.get_proc_freq() that reports the clock
264 * rate of a given cpu. The rest can use ppc_proc_freq to
265 * report the clock rate that is same across all cpus.
267 if (ppc_md.get_proc_freq)
268 proc_freq = ppc_md.get_proc_freq(cpu_id);
270 proc_freq = ppc_proc_freq;
273 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
274 proc_freq / 1000000, proc_freq % 1000000);
276 if (ppc_md.show_percpuinfo != NULL)
277 ppc_md.show_percpuinfo(m, cpu_id);
279 /* If we are a Freescale core do a simple check so
280 * we dont have to keep adding cases in the future */
281 if (PVR_VER(pvr) & 0x8000) {
282 switch (PVR_VER(pvr)) {
283 case 0x8000: /* 7441/7450/7451, Voyager */
284 case 0x8001: /* 7445/7455, Apollo 6 */
285 case 0x8002: /* 7447/7457, Apollo 7 */
286 case 0x8003: /* 7447A, Apollo 7 PM */
287 case 0x8004: /* 7448, Apollo 8 */
288 case 0x800c: /* 7410, Nitro */
289 maj = ((pvr >> 8) & 0xF);
292 default: /* e500/book-e */
298 switch (PVR_VER(pvr)) {
299 case 0x0020: /* 403 family */
300 maj = PVR_MAJ(pvr) + 1;
303 case 0x1008: /* 740P/750P ?? */
304 maj = ((pvr >> 8) & 0xFF) - 1;
308 maj = (pvr >> 8) & 0xFF;
314 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
315 maj, min, PVR_VER(pvr), PVR_REV(pvr));
318 seq_printf(m, "bogomips\t: %lu.%02lu\n",
319 loops_per_jiffy / (500000/HZ),
320 (loops_per_jiffy / (5000/HZ)) % 100);
329 /* If this is the last cpu, print the summary */
330 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
331 show_cpuinfo_summary(m);
336 static void *c_start(struct seq_file *m, loff_t *pos)
338 if (*pos == 0) /* just in case, cpu 0 is not the first */
339 *pos = cpumask_first(cpu_online_mask);
341 *pos = cpumask_next(*pos - 1, cpu_online_mask);
342 if ((*pos) < nr_cpu_ids)
343 return (void *)(unsigned long)(*pos + 1);
347 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
350 return c_start(m, pos);
353 static void c_stop(struct seq_file *m, void *v)
357 const struct seq_operations cpuinfo_op = {
361 .show = show_cpuinfo,
364 void __init check_for_initrd(void)
366 #ifdef CONFIG_BLK_DEV_INITRD
367 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
368 initrd_start, initrd_end);
370 /* If we were passed an initrd, set the ROOT_DEV properly if the values
371 * look sensible. If not, clear initrd reference.
373 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
374 initrd_end > initrd_start)
375 ROOT_DEV = Root_RAM0;
377 initrd_start = initrd_end = 0;
380 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
382 DBG(" <- check_for_initrd()\n");
383 #endif /* CONFIG_BLK_DEV_INITRD */
388 int threads_per_core, threads_per_subcore, threads_shift;
389 cpumask_t threads_core_mask;
390 EXPORT_SYMBOL_GPL(threads_per_core);
391 EXPORT_SYMBOL_GPL(threads_per_subcore);
392 EXPORT_SYMBOL_GPL(threads_shift);
393 EXPORT_SYMBOL_GPL(threads_core_mask);
395 static void __init cpu_init_thread_core_maps(int tpc)
399 threads_per_core = tpc;
400 threads_per_subcore = tpc;
401 cpumask_clear(&threads_core_mask);
403 /* This implementation only supports power of 2 number of threads
404 * for simplicity and performance
406 threads_shift = ilog2(tpc);
407 BUG_ON(tpc != (1 << threads_shift));
409 for (i = 0; i < tpc; i++)
410 cpumask_set_cpu(i, &threads_core_mask);
412 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
413 tpc, tpc > 1 ? "s" : "");
414 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
419 * setup_cpu_maps - initialize the following cpu maps:
423 * Having the possible map set up early allows us to restrict allocations
424 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
426 * We do not initialize the online map here; cpus set their own bits in
427 * cpu_online_mask as they come up.
429 * This function is valid only for Open Firmware systems. finish_device_tree
430 * must be called before using this.
432 * While we're here, we may as well set the "physical" cpu ids in the paca.
434 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
436 void __init smp_setup_cpu_maps(void)
438 struct device_node *dn = NULL;
442 DBG("smp_setup_cpu_maps()\n");
444 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
445 const __be32 *intserv;
449 DBG(" * %s...\n", dn->full_name);
451 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
454 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
457 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
458 intserv = of_get_property(dn, "reg", &len);
460 cpu_be = cpu_to_be32(cpu);
461 intserv = &cpu_be; /* assume logical == phys */
466 nthreads = len / sizeof(int);
468 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
471 DBG(" thread %d -> cpu %d (hard id %d)\n",
472 j, cpu, be32_to_cpu(intserv[j]));
474 avail = of_device_is_available(dn);
476 avail = !of_property_match_string(dn,
477 "enable-method", "spin-table");
479 set_cpu_present(cpu, avail);
480 set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j]));
481 set_cpu_possible(cpu, true);
486 /* If no SMT supported, nthreads is forced to 1 */
487 if (!cpu_has_feature(CPU_FTR_SMT)) {
488 DBG(" SMT disabled ! nthreads forced to 1\n");
494 * On pSeries LPAR, we need to know how many cpus
495 * could possibly be added to this partition.
497 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
498 (dn = of_find_node_by_path("/rtas"))) {
499 int num_addr_cell, num_size_cell, maxcpus;
502 num_addr_cell = of_n_addr_cells(dn);
503 num_size_cell = of_n_size_cells(dn);
505 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
510 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
512 /* Double maxcpus for processors which have SMT capability */
513 if (cpu_has_feature(CPU_FTR_SMT))
516 if (maxcpus > nr_cpu_ids) {
518 "Partition configured for %d cpus, "
519 "operating system maximum is %d.\n",
520 maxcpus, nr_cpu_ids);
521 maxcpus = nr_cpu_ids;
523 printk(KERN_INFO "Partition configured for %d cpus.\n",
526 for (cpu = 0; cpu < maxcpus; cpu++)
527 set_cpu_possible(cpu, true);
531 vdso_data->processorCount = num_present_cpus();
532 #endif /* CONFIG_PPC64 */
534 /* Initialize CPU <=> thread mapping/
536 * WARNING: We assume that the number of threads is the same for
537 * every CPU in the system. If that is not the case, then some code
538 * here will have to be reworked
540 cpu_init_thread_core_maps(nthreads);
542 /* Now that possible cpus are set, set nr_cpu_ids for later use */
547 #endif /* CONFIG_SMP */
549 #ifdef CONFIG_PCSPKR_PLATFORM
550 static __init int add_pcspkr(void)
552 struct device_node *np;
553 struct platform_device *pd;
556 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
561 pd = platform_device_alloc("pcspkr", -1);
565 ret = platform_device_add(pd);
567 platform_device_put(pd);
571 device_initcall(add_pcspkr);
572 #endif /* CONFIG_PCSPKR_PLATFORM */
574 void probe_machine(void)
576 extern struct machdep_calls __machine_desc_start;
577 extern struct machdep_calls __machine_desc_end;
580 * Iterate all ppc_md structures until we find the proper
581 * one for the current machine type
583 DBG("Probing machine type ...\n");
585 for (machine_id = &__machine_desc_start;
586 machine_id < &__machine_desc_end;
588 DBG(" %s ...", machine_id->name);
589 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
590 if (ppc_md.probe()) {
596 /* What can we do if we didn't find ? */
597 if (machine_id >= &__machine_desc_end) {
598 DBG("No suitable machine found !\n");
602 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
605 /* Match a class of boards, not a specific device configuration. */
606 int check_legacy_ioport(unsigned long base_port)
608 struct device_node *parent, *np = NULL;
613 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
614 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
616 parent = of_get_parent(np);
618 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
619 if (!of_i8042_kbd_irq)
620 of_i8042_kbd_irq = 1;
622 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
623 if (!of_i8042_aux_irq)
624 of_i8042_aux_irq = 12;
630 np = of_find_node_by_type(NULL, "8042");
631 /* Pegasos has no device_type on its 8042 node, look for the
634 np = of_find_node_by_name(NULL, "8042");
636 of_i8042_kbd_irq = 1;
637 of_i8042_aux_irq = 12;
640 case FDC_BASE: /* FDC1 */
641 np = of_find_node_by_type(NULL, "fdc");
644 /* ipmi is supposed to fail here */
649 parent = of_get_parent(np);
651 if (strcmp(parent->type, "isa") == 0)
658 EXPORT_SYMBOL(check_legacy_ioport);
660 static int ppc_panic_event(struct notifier_block *this,
661 unsigned long event, void *ptr)
664 * If firmware-assisted dump has been registered then trigger
665 * firmware-assisted dump and let firmware handle everything else.
667 crash_fadump(NULL, ptr);
668 ppc_md.panic(ptr); /* May not return */
672 static struct notifier_block ppc_panic_block = {
673 .notifier_call = ppc_panic_event,
674 .priority = INT_MIN /* may not return; must be done last */
677 void __init setup_panic(void)
679 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
682 #ifdef CONFIG_CHECK_CACHE_COHERENCY
684 * For platforms that have configurable cache-coherency. This function
685 * checks that the cache coherency setting of the kernel matches the setting
686 * left by the firmware, as indicated in the device tree. Since a mismatch
687 * will eventually result in DMA failures, we print * and error and call
688 * BUG() in that case.
691 #ifdef CONFIG_NOT_COHERENT_CACHE
692 #define KERNEL_COHERENCY 0
694 #define KERNEL_COHERENCY 1
697 static int __init check_cache_coherency(void)
699 struct device_node *np;
701 int devtree_coherency;
703 np = of_find_node_by_path("/");
704 prop = of_get_property(np, "coherency-off", NULL);
707 devtree_coherency = prop ? 0 : 1;
709 if (devtree_coherency != KERNEL_COHERENCY) {
711 "kernel coherency:%s != device tree_coherency:%s\n",
712 KERNEL_COHERENCY ? "on" : "off",
713 devtree_coherency ? "on" : "off");
720 late_initcall(check_cache_coherency);
721 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
723 #ifdef CONFIG_DEBUG_FS
724 struct dentry *powerpc_debugfs_root;
725 EXPORT_SYMBOL(powerpc_debugfs_root);
727 static int powerpc_debugfs_init(void)
729 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
731 return powerpc_debugfs_root == NULL;
733 arch_initcall(powerpc_debugfs_init);
736 void ppc_printk_progress(char *s, unsigned short hex)
741 void arch_setup_pdev_archdata(struct platform_device *pdev)
743 pdev->archdata.dma_mask = DMA_BIT_MASK(32);
744 pdev->dev.dma_mask = &pdev->archdata.dma_mask;
745 set_dma_ops(&pdev->dev, &dma_direct_ops);