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/module.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/utsname.h>
28 #include <linux/screen_info.h>
29 #include <linux/root_dev.h>
30 #include <linux/notifier.h>
31 #include <linux/cpu.h>
32 #include <linux/unistd.h>
33 #include <linux/serial.h>
34 #include <linux/serial_8250.h>
35 #include <linux/debugfs.h>
36 #include <linux/percpu.h>
37 #include <linux/lmb.h>
40 #include <asm/processor.h>
41 #include <asm/vdso_datapage.h>
42 #include <asm/pgtable.h>
45 #include <asm/machdep.h>
47 #include <asm/cputable.h>
48 #include <asm/sections.h>
49 #include <asm/firmware.h>
50 #include <asm/btext.h>
51 #include <asm/nvram.h>
52 #include <asm/setup.h>
53 #include <asm/system.h>
55 #include <asm/iommu.h>
56 #include <asm/serial.h>
57 #include <asm/cache.h>
61 #include <asm/cputhreads.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);
79 unsigned long klimit = (unsigned long) _end;
81 char cmd_line[COMMAND_LINE_SIZE];
84 * This still seems to be needed... -- paulus
86 struct screen_info screen_info = {
89 .orig_video_cols = 80,
90 .orig_video_lines = 25,
91 .orig_video_isVGA = 1,
92 .orig_video_points = 16
96 /* XXX should go elsewhere eventually */
97 int ppc_do_canonicalize_irqs;
98 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
101 /* also used by kexec */
102 void machine_shutdown(void)
104 if (ppc_md.machine_shutdown)
105 ppc_md.machine_shutdown();
108 void machine_restart(char *cmd)
116 printk(KERN_EMERG "System Halted, OK to turn off power\n");
121 void machine_power_off(void)
124 if (ppc_md.power_off)
129 printk(KERN_EMERG "System Halted, OK to turn off power\n");
133 /* Used by the G5 thermal driver */
134 EXPORT_SYMBOL_GPL(machine_power_off);
136 void (*pm_power_off)(void) = machine_power_off;
137 EXPORT_SYMBOL_GPL(pm_power_off);
139 void machine_halt(void)
147 printk(KERN_EMERG "System Halted, OK to turn off power\n");
154 extern u32 cpu_temp(unsigned long cpu);
155 extern u32 cpu_temp_both(unsigned long cpu);
156 #endif /* CONFIG_TAU */
159 DEFINE_PER_CPU(unsigned int, pvr);
162 static int show_cpuinfo(struct seq_file *m, void *v)
164 unsigned long cpu_id = (unsigned long)v - 1;
169 if (cpu_id == NR_CPUS) {
170 struct device_node *root;
171 const char *model = NULL;
172 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
173 unsigned long bogosum = 0;
175 for_each_online_cpu(i)
176 bogosum += loops_per_jiffy;
177 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
178 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
179 #endif /* CONFIG_SMP && CONFIG_PPC32 */
180 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
182 seq_printf(m, "platform\t: %s\n", ppc_md.name);
183 root = of_find_node_by_path("/");
185 model = of_get_property(root, "model", NULL);
187 seq_printf(m, "model\t\t: %s\n", model);
190 if (ppc_md.show_cpuinfo != NULL)
191 ppc_md.show_cpuinfo(m);
196 /* We only show online cpus: disable preempt (overzealous, I
197 * knew) to prevent cpu going down. */
199 if (!cpu_online(cpu_id)) {
205 pvr = per_cpu(pvr, cpu_id);
207 pvr = mfspr(SPRN_PVR);
209 maj = (pvr >> 8) & 0xFF;
212 seq_printf(m, "processor\t: %lu\n", cpu_id);
213 seq_printf(m, "cpu\t\t: ");
215 if (cur_cpu_spec->pvr_mask)
216 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
218 seq_printf(m, "unknown (%08x)", pvr);
220 #ifdef CONFIG_ALTIVEC
221 if (cpu_has_feature(CPU_FTR_ALTIVEC))
222 seq_printf(m, ", altivec supported");
223 #endif /* CONFIG_ALTIVEC */
228 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
229 #ifdef CONFIG_TAU_AVERAGE
230 /* more straightforward, but potentially misleading */
231 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
234 /* show the actual temp sensor range */
236 temp = cpu_temp_both(cpu_id);
237 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
238 temp & 0xff, temp >> 16);
241 #endif /* CONFIG_TAU */
244 * Assume here that all clock rates are the same in a
245 * smp system. -- Cort
248 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
249 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
251 if (ppc_md.show_percpuinfo != NULL)
252 ppc_md.show_percpuinfo(m, cpu_id);
254 /* If we are a Freescale core do a simple check so
255 * we dont have to keep adding cases in the future */
256 if (PVR_VER(pvr) & 0x8000) {
260 switch (PVR_VER(pvr)) {
261 case 0x0020: /* 403 family */
262 maj = PVR_MAJ(pvr) + 1;
265 case 0x1008: /* 740P/750P ?? */
266 maj = ((pvr >> 8) & 0xFF) - 1;
270 maj = (pvr >> 8) & 0xFF;
276 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
277 maj, min, PVR_VER(pvr), PVR_REV(pvr));
280 seq_printf(m, "bogomips\t: %lu.%02lu\n",
281 loops_per_jiffy / (500000/HZ),
282 (loops_per_jiffy / (5000/HZ)) % 100);
293 static void *c_start(struct seq_file *m, loff_t *pos)
295 unsigned long i = *pos;
297 return i <= NR_CPUS ? (void *)(i + 1) : NULL;
300 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
303 return c_start(m, pos);
306 static void c_stop(struct seq_file *m, void *v)
310 struct seq_operations cpuinfo_op = {
314 .show = show_cpuinfo,
317 void __init check_for_initrd(void)
319 #ifdef CONFIG_BLK_DEV_INITRD
320 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
321 initrd_start, initrd_end);
323 /* If we were passed an initrd, set the ROOT_DEV properly if the values
324 * look sensible. If not, clear initrd reference.
326 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
327 initrd_end > initrd_start)
328 ROOT_DEV = Root_RAM0;
330 initrd_start = initrd_end = 0;
333 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
335 DBG(" <- check_for_initrd()\n");
336 #endif /* CONFIG_BLK_DEV_INITRD */
341 int threads_per_core, threads_shift;
342 cpumask_t threads_core_mask;
344 static void __init cpu_init_thread_core_maps(int tpc)
348 threads_per_core = tpc;
349 threads_core_mask = CPU_MASK_NONE;
351 /* This implementation only supports power of 2 number of threads
352 * for simplicity and performance
354 threads_shift = ilog2(tpc);
355 BUG_ON(tpc != (1 << threads_shift));
357 for (i = 0; i < tpc; i++)
358 cpu_set(i, threads_core_mask);
360 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
361 tpc, tpc > 1 ? "s" : "");
362 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
367 * setup_cpu_maps - initialize the following cpu maps:
371 * Having the possible map set up early allows us to restrict allocations
372 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
374 * We do not initialize the online map here; cpus set their own bits in
375 * cpu_online_map as they come up.
377 * This function is valid only for Open Firmware systems. finish_device_tree
378 * must be called before using this.
380 * While we're here, we may as well set the "physical" cpu ids in the paca.
382 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
384 void __init smp_setup_cpu_maps(void)
386 struct device_node *dn = NULL;
390 DBG("smp_setup_cpu_maps()\n");
392 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
396 DBG(" * %s...\n", dn->full_name);
398 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
401 nthreads = len / sizeof(int);
402 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
405 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
406 intserv = of_get_property(dn, "reg", NULL);
408 intserv = &cpu; /* assume logical == phys */
411 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
412 DBG(" thread %d -> cpu %d (hard id %d)\n",
414 cpu_set(cpu, cpu_present_map);
415 set_hard_smp_processor_id(cpu, intserv[j]);
416 cpu_set(cpu, cpu_possible_map);
421 /* If no SMT supported, nthreads is forced to 1 */
422 if (!cpu_has_feature(CPU_FTR_SMT)) {
423 DBG(" SMT disabled ! nthreads forced to 1\n");
429 * On pSeries LPAR, we need to know how many cpus
430 * could possibly be added to this partition.
432 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
433 (dn = of_find_node_by_path("/rtas"))) {
434 int num_addr_cell, num_size_cell, maxcpus;
435 const unsigned int *ireg;
437 num_addr_cell = of_n_addr_cells(dn);
438 num_size_cell = of_n_size_cells(dn);
440 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
445 maxcpus = ireg[num_addr_cell + num_size_cell];
447 /* Double maxcpus for processors which have SMT capability */
448 if (cpu_has_feature(CPU_FTR_SMT))
451 if (maxcpus > NR_CPUS) {
453 "Partition configured for %d cpus, "
454 "operating system maximum is %d.\n",
458 printk(KERN_INFO "Partition configured for %d cpus.\n",
461 for (cpu = 0; cpu < maxcpus; cpu++)
462 cpu_set(cpu, cpu_possible_map);
466 vdso_data->processorCount = num_present_cpus();
467 #endif /* CONFIG_PPC64 */
469 /* Initialize CPU <=> thread mapping/
471 * WARNING: We assume that the number of threads is the same for
472 * every CPU in the system. If that is not the case, then some code
473 * here will have to be reworked
475 cpu_init_thread_core_maps(nthreads);
477 #endif /* CONFIG_SMP */
479 #ifdef CONFIG_PCSPKR_PLATFORM
480 static __init int add_pcspkr(void)
482 struct device_node *np;
483 struct platform_device *pd;
486 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
491 pd = platform_device_alloc("pcspkr", -1);
495 ret = platform_device_add(pd);
497 platform_device_put(pd);
501 device_initcall(add_pcspkr);
502 #endif /* CONFIG_PCSPKR_PLATFORM */
504 void probe_machine(void)
506 extern struct machdep_calls __machine_desc_start;
507 extern struct machdep_calls __machine_desc_end;
510 * Iterate all ppc_md structures until we find the proper
511 * one for the current machine type
513 DBG("Probing machine type ...\n");
515 for (machine_id = &__machine_desc_start;
516 machine_id < &__machine_desc_end;
518 DBG(" %s ...", machine_id->name);
519 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
520 if (ppc_md.probe()) {
526 /* What can we do if we didn't find ? */
527 if (machine_id >= &__machine_desc_end) {
528 DBG("No suitable machine found !\n");
532 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
535 /* Match a class of boards, not a specific device configuration. */
536 int check_legacy_ioport(unsigned long base_port)
538 struct device_node *parent, *np = NULL;
543 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
544 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
546 parent = of_get_parent(np);
551 np = of_find_node_by_type(NULL, "8042");
552 /* Pegasos has no device_type on its 8042 node, look for the
555 np = of_find_node_by_name(NULL, "8042");
557 case FDC_BASE: /* FDC1 */
558 np = of_find_node_by_type(NULL, "fdc");
560 #ifdef CONFIG_PPC_PREP
567 /* ipmi is supposed to fail here */
572 parent = of_get_parent(np);
574 if (strcmp(parent->type, "isa") == 0)
581 EXPORT_SYMBOL(check_legacy_ioport);
583 static int ppc_panic_event(struct notifier_block *this,
584 unsigned long event, void *ptr)
586 ppc_md.panic(ptr); /* May not return */
590 static struct notifier_block ppc_panic_block = {
591 .notifier_call = ppc_panic_event,
592 .priority = INT_MIN /* may not return; must be done last */
595 void __init setup_panic(void)
597 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
600 #ifdef CONFIG_CHECK_CACHE_COHERENCY
602 * For platforms that have configurable cache-coherency. This function
603 * checks that the cache coherency setting of the kernel matches the setting
604 * left by the firmware, as indicated in the device tree. Since a mismatch
605 * will eventually result in DMA failures, we print * and error and call
606 * BUG() in that case.
609 #ifdef CONFIG_NOT_COHERENT_CACHE
610 #define KERNEL_COHERENCY 0
612 #define KERNEL_COHERENCY 1
615 static int __init check_cache_coherency(void)
617 struct device_node *np;
619 int devtree_coherency;
621 np = of_find_node_by_path("/");
622 prop = of_get_property(np, "coherency-off", NULL);
625 devtree_coherency = prop ? 0 : 1;
627 if (devtree_coherency != KERNEL_COHERENCY) {
629 "kernel coherency:%s != device tree_coherency:%s\n",
630 KERNEL_COHERENCY ? "on" : "off",
631 devtree_coherency ? "on" : "off");
638 late_initcall(check_cache_coherency);
639 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
641 #ifdef CONFIG_DEBUG_FS
642 struct dentry *powerpc_debugfs_root;
644 static int powerpc_debugfs_init(void)
646 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
648 return powerpc_debugfs_root == NULL;
650 arch_initcall(powerpc_debugfs_init);