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>
54 #include <asm/system.h>
56 #include <asm/iommu.h>
57 #include <asm/serial.h>
58 #include <asm/cache.h>
62 #include <asm/cputhreads.h>
63 #include <mm/mmu_decl.h>
64 #include <asm/fadump.h>
70 #define DBG(fmt...) udbg_printf(fmt)
75 /* The main machine-dep calls structure
77 struct machdep_calls ppc_md;
78 EXPORT_SYMBOL(ppc_md);
79 struct machdep_calls *machine_id;
80 EXPORT_SYMBOL(machine_id);
82 unsigned long klimit = (unsigned long) _end;
84 char cmd_line[COMMAND_LINE_SIZE];
87 * This still seems to be needed... -- paulus
89 struct screen_info screen_info = {
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 */
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);
110 /* also used by kexec */
111 void machine_shutdown(void)
113 if (ppc_md.machine_shutdown)
114 ppc_md.machine_shutdown();
117 void machine_restart(char *cmd)
125 printk(KERN_EMERG "System Halted, OK to turn off power\n");
130 void machine_power_off(void)
133 if (ppc_md.power_off)
138 printk(KERN_EMERG "System Halted, OK to turn off power\n");
142 /* Used by the G5 thermal driver */
143 EXPORT_SYMBOL_GPL(machine_power_off);
145 void (*pm_power_off)(void) = machine_power_off;
146 EXPORT_SYMBOL_GPL(pm_power_off);
148 void machine_halt(void)
156 printk(KERN_EMERG "System Halted, OK to turn off power\n");
163 extern u32 cpu_temp(unsigned long cpu);
164 extern u32 cpu_temp_both(unsigned long cpu);
165 #endif /* CONFIG_TAU */
168 DEFINE_PER_CPU(unsigned int, cpu_pvr);
171 static void show_cpuinfo_summary(struct seq_file *m)
173 struct device_node *root;
174 const char *model = NULL;
175 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
176 unsigned long bogosum = 0;
178 for_each_online_cpu(i)
179 bogosum += loops_per_jiffy;
180 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
181 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
182 #endif /* CONFIG_SMP && CONFIG_PPC32 */
183 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
185 seq_printf(m, "platform\t: %s\n", ppc_md.name);
186 root = of_find_node_by_path("/");
188 model = of_get_property(root, "model", NULL);
190 seq_printf(m, "model\t\t: %s\n", model);
193 if (ppc_md.show_cpuinfo != NULL)
194 ppc_md.show_cpuinfo(m);
197 /* Display the amount of memory */
198 seq_printf(m, "Memory\t\t: %d MB\n",
199 (unsigned int)(total_memory / (1024 * 1024)));
203 static int show_cpuinfo(struct seq_file *m, void *v)
205 unsigned long cpu_id = (unsigned long)v - 1;
210 /* We only show online cpus: disable preempt (overzealous, I
211 * knew) to prevent cpu going down. */
213 if (!cpu_online(cpu_id)) {
219 pvr = per_cpu(cpu_pvr, cpu_id);
221 pvr = mfspr(SPRN_PVR);
223 maj = (pvr >> 8) & 0xFF;
226 seq_printf(m, "processor\t: %lu\n", cpu_id);
227 seq_printf(m, "cpu\t\t: ");
229 if (cur_cpu_spec->pvr_mask)
230 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
232 seq_printf(m, "unknown (%08x)", pvr);
234 #ifdef CONFIG_ALTIVEC
235 if (cpu_has_feature(CPU_FTR_ALTIVEC))
236 seq_printf(m, ", altivec supported");
237 #endif /* CONFIG_ALTIVEC */
242 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
243 #ifdef CONFIG_TAU_AVERAGE
244 /* more straightforward, but potentially misleading */
245 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
248 /* show the actual temp sensor range */
250 temp = cpu_temp_both(cpu_id);
251 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
252 temp & 0xff, temp >> 16);
255 #endif /* CONFIG_TAU */
258 * Assume here that all clock rates are the same in a
259 * smp system. -- Cort
262 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
263 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
265 if (ppc_md.show_percpuinfo != NULL)
266 ppc_md.show_percpuinfo(m, cpu_id);
268 /* If we are a Freescale core do a simple check so
269 * we dont have to keep adding cases in the future */
270 if (PVR_VER(pvr) & 0x8000) {
271 switch (PVR_VER(pvr)) {
272 case 0x8000: /* 7441/7450/7451, Voyager */
273 case 0x8001: /* 7445/7455, Apollo 6 */
274 case 0x8002: /* 7447/7457, Apollo 7 */
275 case 0x8003: /* 7447A, Apollo 7 PM */
276 case 0x8004: /* 7448, Apollo 8 */
277 case 0x800c: /* 7410, Nitro */
278 maj = ((pvr >> 8) & 0xF);
281 default: /* e500/book-e */
287 switch (PVR_VER(pvr)) {
288 case 0x0020: /* 403 family */
289 maj = PVR_MAJ(pvr) + 1;
292 case 0x1008: /* 740P/750P ?? */
293 maj = ((pvr >> 8) & 0xFF) - 1;
297 maj = (pvr >> 8) & 0xFF;
303 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
304 maj, min, PVR_VER(pvr), PVR_REV(pvr));
307 seq_printf(m, "bogomips\t: %lu.%02lu\n",
308 loops_per_jiffy / (500000/HZ),
309 (loops_per_jiffy / (5000/HZ)) % 100);
318 /* If this is the last cpu, print the summary */
319 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
320 show_cpuinfo_summary(m);
325 static void *c_start(struct seq_file *m, loff_t *pos)
327 if (*pos == 0) /* just in case, cpu 0 is not the first */
328 *pos = cpumask_first(cpu_online_mask);
330 *pos = cpumask_next(*pos - 1, cpu_online_mask);
331 if ((*pos) < nr_cpu_ids)
332 return (void *)(unsigned long)(*pos + 1);
336 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
339 return c_start(m, pos);
342 static void c_stop(struct seq_file *m, void *v)
346 const struct seq_operations cpuinfo_op = {
350 .show = show_cpuinfo,
353 void __init check_for_initrd(void)
355 #ifdef CONFIG_BLK_DEV_INITRD
356 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
357 initrd_start, initrd_end);
359 /* If we were passed an initrd, set the ROOT_DEV properly if the values
360 * look sensible. If not, clear initrd reference.
362 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
363 initrd_end > initrd_start)
364 ROOT_DEV = Root_RAM0;
366 initrd_start = initrd_end = 0;
369 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
371 DBG(" <- check_for_initrd()\n");
372 #endif /* CONFIG_BLK_DEV_INITRD */
377 int threads_per_core, threads_shift;
378 cpumask_t threads_core_mask;
379 EXPORT_SYMBOL_GPL(threads_per_core);
380 EXPORT_SYMBOL_GPL(threads_shift);
381 EXPORT_SYMBOL_GPL(threads_core_mask);
383 static void __init cpu_init_thread_core_maps(int tpc)
387 threads_per_core = tpc;
388 cpumask_clear(&threads_core_mask);
390 /* This implementation only supports power of 2 number of threads
391 * for simplicity and performance
393 threads_shift = ilog2(tpc);
394 BUG_ON(tpc != (1 << threads_shift));
396 for (i = 0; i < tpc; i++)
397 cpumask_set_cpu(i, &threads_core_mask);
399 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
400 tpc, tpc > 1 ? "s" : "");
401 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
406 * setup_cpu_maps - initialize the following cpu maps:
410 * Having the possible map set up early allows us to restrict allocations
411 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
413 * We do not initialize the online map here; cpus set their own bits in
414 * cpu_online_mask as they come up.
416 * This function is valid only for Open Firmware systems. finish_device_tree
417 * must be called before using this.
419 * While we're here, we may as well set the "physical" cpu ids in the paca.
421 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
423 void __init smp_setup_cpu_maps(void)
425 struct device_node *dn = NULL;
429 DBG("smp_setup_cpu_maps()\n");
431 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
435 DBG(" * %s...\n", dn->full_name);
437 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
440 nthreads = len / sizeof(int);
441 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
444 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
445 intserv = of_get_property(dn, "reg", NULL);
447 intserv = &cpu; /* assume logical == phys */
450 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
451 DBG(" thread %d -> cpu %d (hard id %d)\n",
453 set_cpu_present(cpu, true);
454 set_hard_smp_processor_id(cpu, intserv[j]);
455 set_cpu_possible(cpu, true);
460 /* If no SMT supported, nthreads is forced to 1 */
461 if (!cpu_has_feature(CPU_FTR_SMT)) {
462 DBG(" SMT disabled ! nthreads forced to 1\n");
468 * On pSeries LPAR, we need to know how many cpus
469 * could possibly be added to this partition.
471 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
472 (dn = of_find_node_by_path("/rtas"))) {
473 int num_addr_cell, num_size_cell, maxcpus;
474 const unsigned int *ireg;
476 num_addr_cell = of_n_addr_cells(dn);
477 num_size_cell = of_n_size_cells(dn);
479 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
484 maxcpus = ireg[num_addr_cell + num_size_cell];
486 /* Double maxcpus for processors which have SMT capability */
487 if (cpu_has_feature(CPU_FTR_SMT))
490 if (maxcpus > nr_cpu_ids) {
492 "Partition configured for %d cpus, "
493 "operating system maximum is %d.\n",
494 maxcpus, nr_cpu_ids);
495 maxcpus = nr_cpu_ids;
497 printk(KERN_INFO "Partition configured for %d cpus.\n",
500 for (cpu = 0; cpu < maxcpus; cpu++)
501 set_cpu_possible(cpu, true);
505 vdso_data->processorCount = num_present_cpus();
506 #endif /* CONFIG_PPC64 */
508 /* Initialize CPU <=> thread mapping/
510 * WARNING: We assume that the number of threads is the same for
511 * every CPU in the system. If that is not the case, then some code
512 * here will have to be reworked
514 cpu_init_thread_core_maps(nthreads);
516 /* Now that possible cpus are set, set nr_cpu_ids for later use */
521 #endif /* CONFIG_SMP */
523 #ifdef CONFIG_PCSPKR_PLATFORM
524 static __init int add_pcspkr(void)
526 struct device_node *np;
527 struct platform_device *pd;
530 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
535 pd = platform_device_alloc("pcspkr", -1);
539 ret = platform_device_add(pd);
541 platform_device_put(pd);
545 device_initcall(add_pcspkr);
546 #endif /* CONFIG_PCSPKR_PLATFORM */
548 void probe_machine(void)
550 extern struct machdep_calls __machine_desc_start;
551 extern struct machdep_calls __machine_desc_end;
554 * Iterate all ppc_md structures until we find the proper
555 * one for the current machine type
557 DBG("Probing machine type ...\n");
559 for (machine_id = &__machine_desc_start;
560 machine_id < &__machine_desc_end;
562 DBG(" %s ...", machine_id->name);
563 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
564 if (ppc_md.probe()) {
570 /* What can we do if we didn't find ? */
571 if (machine_id >= &__machine_desc_end) {
572 DBG("No suitable machine found !\n");
576 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
579 /* Match a class of boards, not a specific device configuration. */
580 int check_legacy_ioport(unsigned long base_port)
582 struct device_node *parent, *np = NULL;
587 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
588 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
590 parent = of_get_parent(np);
592 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
593 if (!of_i8042_kbd_irq)
594 of_i8042_kbd_irq = 1;
596 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
597 if (!of_i8042_aux_irq)
598 of_i8042_aux_irq = 12;
604 np = of_find_node_by_type(NULL, "8042");
605 /* Pegasos has no device_type on its 8042 node, look for the
608 np = of_find_node_by_name(NULL, "8042");
610 of_i8042_kbd_irq = 1;
611 of_i8042_aux_irq = 12;
614 case FDC_BASE: /* FDC1 */
615 np = of_find_node_by_type(NULL, "fdc");
617 #ifdef CONFIG_PPC_PREP
624 /* ipmi is supposed to fail here */
629 parent = of_get_parent(np);
631 if (strcmp(parent->type, "isa") == 0)
638 EXPORT_SYMBOL(check_legacy_ioport);
640 static int ppc_panic_event(struct notifier_block *this,
641 unsigned long event, void *ptr)
644 * If firmware-assisted dump has been registered then trigger
645 * firmware-assisted dump and let firmware handle everything else.
647 crash_fadump(NULL, ptr);
648 ppc_md.panic(ptr); /* May not return */
652 static struct notifier_block ppc_panic_block = {
653 .notifier_call = ppc_panic_event,
654 .priority = INT_MIN /* may not return; must be done last */
657 void __init setup_panic(void)
659 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
662 #ifdef CONFIG_CHECK_CACHE_COHERENCY
664 * For platforms that have configurable cache-coherency. This function
665 * checks that the cache coherency setting of the kernel matches the setting
666 * left by the firmware, as indicated in the device tree. Since a mismatch
667 * will eventually result in DMA failures, we print * and error and call
668 * BUG() in that case.
671 #ifdef CONFIG_NOT_COHERENT_CACHE
672 #define KERNEL_COHERENCY 0
674 #define KERNEL_COHERENCY 1
677 static int __init check_cache_coherency(void)
679 struct device_node *np;
681 int devtree_coherency;
683 np = of_find_node_by_path("/");
684 prop = of_get_property(np, "coherency-off", NULL);
687 devtree_coherency = prop ? 0 : 1;
689 if (devtree_coherency != KERNEL_COHERENCY) {
691 "kernel coherency:%s != device tree_coherency:%s\n",
692 KERNEL_COHERENCY ? "on" : "off",
693 devtree_coherency ? "on" : "off");
700 late_initcall(check_cache_coherency);
701 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
703 #ifdef CONFIG_DEBUG_FS
704 struct dentry *powerpc_debugfs_root;
705 EXPORT_SYMBOL(powerpc_debugfs_root);
707 static int powerpc_debugfs_init(void)
709 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
711 return powerpc_debugfs_root == NULL;
713 arch_initcall(powerpc_debugfs_init);
716 void ppc_printk_progress(char *s, unsigned short hex)
721 void arch_setup_pdev_archdata(struct platform_device *pdev)
723 pdev->archdata.dma_mask = DMA_BIT_MASK(32);
724 pdev->dev.dma_mask = &pdev->archdata.dma_mask;
725 set_dma_ops(&pdev->dev, &dma_direct_ops);