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>
69 #define DBG(fmt...) udbg_printf(fmt)
74 /* The main machine-dep calls structure
76 struct machdep_calls ppc_md;
77 EXPORT_SYMBOL(ppc_md);
78 struct machdep_calls *machine_id;
79 EXPORT_SYMBOL(machine_id);
81 unsigned long klimit = (unsigned long) _end;
83 char cmd_line[COMMAND_LINE_SIZE];
86 * This still seems to be needed... -- paulus
88 struct screen_info screen_info = {
91 .orig_video_cols = 80,
92 .orig_video_lines = 25,
93 .orig_video_isVGA = 1,
94 .orig_video_points = 16
97 /* Variables required to store legacy IO irq routing */
99 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
100 int of_i8042_aux_irq;
101 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
103 #ifdef __DO_IRQ_CANON
104 /* XXX should go elsewhere eventually */
105 int ppc_do_canonicalize_irqs;
106 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
109 /* also used by kexec */
110 void machine_shutdown(void)
112 if (ppc_md.machine_shutdown)
113 ppc_md.machine_shutdown();
116 void machine_restart(char *cmd)
124 printk(KERN_EMERG "System Halted, OK to turn off power\n");
129 void machine_power_off(void)
132 if (ppc_md.power_off)
137 printk(KERN_EMERG "System Halted, OK to turn off power\n");
141 /* Used by the G5 thermal driver */
142 EXPORT_SYMBOL_GPL(machine_power_off);
144 void (*pm_power_off)(void) = machine_power_off;
145 EXPORT_SYMBOL_GPL(pm_power_off);
147 void machine_halt(void)
155 printk(KERN_EMERG "System Halted, OK to turn off power\n");
162 extern u32 cpu_temp(unsigned long cpu);
163 extern u32 cpu_temp_both(unsigned long cpu);
164 #endif /* CONFIG_TAU */
167 DEFINE_PER_CPU(unsigned int, cpu_pvr);
170 static void show_cpuinfo_summary(struct seq_file *m)
172 struct device_node *root;
173 const char *model = NULL;
174 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
175 unsigned long bogosum = 0;
177 for_each_online_cpu(i)
178 bogosum += loops_per_jiffy;
179 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
180 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
181 #endif /* CONFIG_SMP && CONFIG_PPC32 */
182 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
184 seq_printf(m, "platform\t: %s\n", ppc_md.name);
185 root = of_find_node_by_path("/");
187 model = of_get_property(root, "model", NULL);
189 seq_printf(m, "model\t\t: %s\n", model);
192 if (ppc_md.show_cpuinfo != NULL)
193 ppc_md.show_cpuinfo(m);
196 /* Display the amount of memory */
197 seq_printf(m, "Memory\t\t: %d MB\n",
198 (unsigned int)(total_memory / (1024 * 1024)));
202 static int show_cpuinfo(struct seq_file *m, void *v)
204 unsigned long cpu_id = (unsigned long)v - 1;
209 /* We only show online cpus: disable preempt (overzealous, I
210 * knew) to prevent cpu going down. */
212 if (!cpu_online(cpu_id)) {
218 pvr = per_cpu(cpu_pvr, cpu_id);
220 pvr = mfspr(SPRN_PVR);
222 maj = (pvr >> 8) & 0xFF;
225 seq_printf(m, "processor\t: %lu\n", cpu_id);
226 seq_printf(m, "cpu\t\t: ");
228 if (cur_cpu_spec->pvr_mask)
229 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
231 seq_printf(m, "unknown (%08x)", pvr);
233 #ifdef CONFIG_ALTIVEC
234 if (cpu_has_feature(CPU_FTR_ALTIVEC))
235 seq_printf(m, ", altivec supported");
236 #endif /* CONFIG_ALTIVEC */
241 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
242 #ifdef CONFIG_TAU_AVERAGE
243 /* more straightforward, but potentially misleading */
244 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
247 /* show the actual temp sensor range */
249 temp = cpu_temp_both(cpu_id);
250 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
251 temp & 0xff, temp >> 16);
254 #endif /* CONFIG_TAU */
257 * Assume here that all clock rates are the same in a
258 * smp system. -- Cort
261 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
262 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
264 if (ppc_md.show_percpuinfo != NULL)
265 ppc_md.show_percpuinfo(m, cpu_id);
267 /* If we are a Freescale core do a simple check so
268 * we dont have to keep adding cases in the future */
269 if (PVR_VER(pvr) & 0x8000) {
270 switch (PVR_VER(pvr)) {
271 case 0x8000: /* 7441/7450/7451, Voyager */
272 case 0x8001: /* 7445/7455, Apollo 6 */
273 case 0x8002: /* 7447/7457, Apollo 7 */
274 case 0x8003: /* 7447A, Apollo 7 PM */
275 case 0x8004: /* 7448, Apollo 8 */
276 case 0x800c: /* 7410, Nitro */
277 maj = ((pvr >> 8) & 0xF);
280 default: /* e500/book-e */
286 switch (PVR_VER(pvr)) {
287 case 0x0020: /* 403 family */
288 maj = PVR_MAJ(pvr) + 1;
291 case 0x1008: /* 740P/750P ?? */
292 maj = ((pvr >> 8) & 0xFF) - 1;
296 maj = (pvr >> 8) & 0xFF;
302 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
303 maj, min, PVR_VER(pvr), PVR_REV(pvr));
306 seq_printf(m, "bogomips\t: %lu.%02lu\n",
307 loops_per_jiffy / (500000/HZ),
308 (loops_per_jiffy / (5000/HZ)) % 100);
317 /* If this is the last cpu, print the summary */
318 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
319 show_cpuinfo_summary(m);
324 static void *c_start(struct seq_file *m, loff_t *pos)
326 if (*pos == 0) /* just in case, cpu 0 is not the first */
327 *pos = cpumask_first(cpu_online_mask);
329 *pos = cpumask_next(*pos - 1, cpu_online_mask);
330 if ((*pos) < nr_cpu_ids)
331 return (void *)(unsigned long)(*pos + 1);
335 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
338 return c_start(m, pos);
341 static void c_stop(struct seq_file *m, void *v)
345 const struct seq_operations cpuinfo_op = {
349 .show = show_cpuinfo,
352 void __init check_for_initrd(void)
354 #ifdef CONFIG_BLK_DEV_INITRD
355 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
356 initrd_start, initrd_end);
358 /* If we were passed an initrd, set the ROOT_DEV properly if the values
359 * look sensible. If not, clear initrd reference.
361 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
362 initrd_end > initrd_start)
363 ROOT_DEV = Root_RAM0;
365 initrd_start = initrd_end = 0;
368 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
370 DBG(" <- check_for_initrd()\n");
371 #endif /* CONFIG_BLK_DEV_INITRD */
376 int threads_per_core, threads_shift;
377 cpumask_t threads_core_mask;
378 EXPORT_SYMBOL_GPL(threads_per_core);
379 EXPORT_SYMBOL_GPL(threads_shift);
380 EXPORT_SYMBOL_GPL(threads_core_mask);
382 static void __init cpu_init_thread_core_maps(int tpc)
386 threads_per_core = tpc;
387 cpumask_clear(&threads_core_mask);
389 /* This implementation only supports power of 2 number of threads
390 * for simplicity and performance
392 threads_shift = ilog2(tpc);
393 BUG_ON(tpc != (1 << threads_shift));
395 for (i = 0; i < tpc; i++)
396 cpumask_set_cpu(i, &threads_core_mask);
398 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
399 tpc, tpc > 1 ? "s" : "");
400 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
405 * setup_cpu_maps - initialize the following cpu maps:
409 * Having the possible map set up early allows us to restrict allocations
410 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
412 * We do not initialize the online map here; cpus set their own bits in
413 * cpu_online_mask as they come up.
415 * This function is valid only for Open Firmware systems. finish_device_tree
416 * must be called before using this.
418 * While we're here, we may as well set the "physical" cpu ids in the paca.
420 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
422 void __init smp_setup_cpu_maps(void)
424 struct device_node *dn = NULL;
428 DBG("smp_setup_cpu_maps()\n");
430 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
434 DBG(" * %s...\n", dn->full_name);
436 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
439 nthreads = len / sizeof(int);
440 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
443 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
444 intserv = of_get_property(dn, "reg", NULL);
446 intserv = &cpu; /* assume logical == phys */
449 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
450 DBG(" thread %d -> cpu %d (hard id %d)\n",
452 set_cpu_present(cpu, true);
453 set_hard_smp_processor_id(cpu, intserv[j]);
454 set_cpu_possible(cpu, true);
459 /* If no SMT supported, nthreads is forced to 1 */
460 if (!cpu_has_feature(CPU_FTR_SMT)) {
461 DBG(" SMT disabled ! nthreads forced to 1\n");
467 * On pSeries LPAR, we need to know how many cpus
468 * could possibly be added to this partition.
470 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
471 (dn = of_find_node_by_path("/rtas"))) {
472 int num_addr_cell, num_size_cell, maxcpus;
473 const unsigned int *ireg;
475 num_addr_cell = of_n_addr_cells(dn);
476 num_size_cell = of_n_size_cells(dn);
478 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
483 maxcpus = ireg[num_addr_cell + num_size_cell];
485 /* Double maxcpus for processors which have SMT capability */
486 if (cpu_has_feature(CPU_FTR_SMT))
489 if (maxcpus > nr_cpu_ids) {
491 "Partition configured for %d cpus, "
492 "operating system maximum is %d.\n",
493 maxcpus, nr_cpu_ids);
494 maxcpus = nr_cpu_ids;
496 printk(KERN_INFO "Partition configured for %d cpus.\n",
499 for (cpu = 0; cpu < maxcpus; cpu++)
500 set_cpu_possible(cpu, true);
504 vdso_data->processorCount = num_present_cpus();
505 #endif /* CONFIG_PPC64 */
507 /* Initialize CPU <=> thread mapping/
509 * WARNING: We assume that the number of threads is the same for
510 * every CPU in the system. If that is not the case, then some code
511 * here will have to be reworked
513 cpu_init_thread_core_maps(nthreads);
515 /* Now that possible cpus are set, set nr_cpu_ids for later use */
520 #endif /* CONFIG_SMP */
522 #ifdef CONFIG_PCSPKR_PLATFORM
523 static __init int add_pcspkr(void)
525 struct device_node *np;
526 struct platform_device *pd;
529 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
534 pd = platform_device_alloc("pcspkr", -1);
538 ret = platform_device_add(pd);
540 platform_device_put(pd);
544 device_initcall(add_pcspkr);
545 #endif /* CONFIG_PCSPKR_PLATFORM */
547 void probe_machine(void)
549 extern struct machdep_calls __machine_desc_start;
550 extern struct machdep_calls __machine_desc_end;
553 * Iterate all ppc_md structures until we find the proper
554 * one for the current machine type
556 DBG("Probing machine type ...\n");
558 for (machine_id = &__machine_desc_start;
559 machine_id < &__machine_desc_end;
561 DBG(" %s ...", machine_id->name);
562 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
563 if (ppc_md.probe()) {
569 /* What can we do if we didn't find ? */
570 if (machine_id >= &__machine_desc_end) {
571 DBG("No suitable machine found !\n");
575 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
578 /* Match a class of boards, not a specific device configuration. */
579 int check_legacy_ioport(unsigned long base_port)
581 struct device_node *parent, *np = NULL;
586 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
587 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
589 parent = of_get_parent(np);
591 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
592 if (!of_i8042_kbd_irq)
593 of_i8042_kbd_irq = 1;
595 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
596 if (!of_i8042_aux_irq)
597 of_i8042_aux_irq = 12;
603 np = of_find_node_by_type(NULL, "8042");
604 /* Pegasos has no device_type on its 8042 node, look for the
607 np = of_find_node_by_name(NULL, "8042");
609 of_i8042_kbd_irq = 1;
610 of_i8042_aux_irq = 12;
613 case FDC_BASE: /* FDC1 */
614 np = of_find_node_by_type(NULL, "fdc");
616 #ifdef CONFIG_PPC_PREP
623 /* ipmi is supposed to fail here */
628 parent = of_get_parent(np);
630 if (strcmp(parent->type, "isa") == 0)
637 EXPORT_SYMBOL(check_legacy_ioport);
639 static int ppc_panic_event(struct notifier_block *this,
640 unsigned long event, void *ptr)
642 ppc_md.panic(ptr); /* May not return */
646 static struct notifier_block ppc_panic_block = {
647 .notifier_call = ppc_panic_event,
648 .priority = INT_MIN /* may not return; must be done last */
651 void __init setup_panic(void)
653 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
656 #ifdef CONFIG_CHECK_CACHE_COHERENCY
658 * For platforms that have configurable cache-coherency. This function
659 * checks that the cache coherency setting of the kernel matches the setting
660 * left by the firmware, as indicated in the device tree. Since a mismatch
661 * will eventually result in DMA failures, we print * and error and call
662 * BUG() in that case.
665 #ifdef CONFIG_NOT_COHERENT_CACHE
666 #define KERNEL_COHERENCY 0
668 #define KERNEL_COHERENCY 1
671 static int __init check_cache_coherency(void)
673 struct device_node *np;
675 int devtree_coherency;
677 np = of_find_node_by_path("/");
678 prop = of_get_property(np, "coherency-off", NULL);
681 devtree_coherency = prop ? 0 : 1;
683 if (devtree_coherency != KERNEL_COHERENCY) {
685 "kernel coherency:%s != device tree_coherency:%s\n",
686 KERNEL_COHERENCY ? "on" : "off",
687 devtree_coherency ? "on" : "off");
694 late_initcall(check_cache_coherency);
695 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
697 #ifdef CONFIG_DEBUG_FS
698 struct dentry *powerpc_debugfs_root;
699 EXPORT_SYMBOL(powerpc_debugfs_root);
701 static int powerpc_debugfs_init(void)
703 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
705 return powerpc_debugfs_root == NULL;
707 arch_initcall(powerpc_debugfs_init);
710 void ppc_printk_progress(char *s, unsigned short hex)
715 void arch_setup_pdev_archdata(struct platform_device *pdev)
717 pdev->archdata.dma_mask = DMA_BIT_MASK(32);
718 pdev->dev.dma_mask = &pdev->archdata.dma_mask;
719 set_dma_ops(&pdev->dev, &dma_direct_ops);