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/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 */
101 #ifdef __DO_IRQ_CANON
102 /* XXX should go elsewhere eventually */
103 int ppc_do_canonicalize_irqs;
104 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
107 /* also used by kexec */
108 void machine_shutdown(void)
110 if (ppc_md.machine_shutdown)
111 ppc_md.machine_shutdown();
114 void machine_restart(char *cmd)
122 printk(KERN_EMERG "System Halted, OK to turn off power\n");
127 void machine_power_off(void)
130 if (ppc_md.power_off)
135 printk(KERN_EMERG "System Halted, OK to turn off power\n");
139 /* Used by the G5 thermal driver */
140 EXPORT_SYMBOL_GPL(machine_power_off);
142 void (*pm_power_off)(void) = machine_power_off;
143 EXPORT_SYMBOL_GPL(pm_power_off);
145 void machine_halt(void)
153 printk(KERN_EMERG "System Halted, OK to turn off power\n");
160 extern u32 cpu_temp(unsigned long cpu);
161 extern u32 cpu_temp_both(unsigned long cpu);
162 #endif /* CONFIG_TAU */
165 DEFINE_PER_CPU(unsigned int, cpu_pvr);
168 static void show_cpuinfo_summary(struct seq_file *m)
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);
194 /* Display the amount of memory */
195 seq_printf(m, "Memory\t\t: %d MB\n",
196 (unsigned int)(total_memory / (1024 * 1024)));
200 static int show_cpuinfo(struct seq_file *m, void *v)
202 unsigned long cpu_id = (unsigned long)v - 1;
207 /* We only show online cpus: disable preempt (overzealous, I
208 * knew) to prevent cpu going down. */
210 if (!cpu_online(cpu_id)) {
216 pvr = per_cpu(cpu_pvr, cpu_id);
218 pvr = mfspr(SPRN_PVR);
220 maj = (pvr >> 8) & 0xFF;
223 seq_printf(m, "processor\t: %lu\n", cpu_id);
224 seq_printf(m, "cpu\t\t: ");
226 if (cur_cpu_spec->pvr_mask)
227 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
229 seq_printf(m, "unknown (%08x)", pvr);
231 #ifdef CONFIG_ALTIVEC
232 if (cpu_has_feature(CPU_FTR_ALTIVEC))
233 seq_printf(m, ", altivec supported");
234 #endif /* CONFIG_ALTIVEC */
239 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
240 #ifdef CONFIG_TAU_AVERAGE
241 /* more straightforward, but potentially misleading */
242 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
245 /* show the actual temp sensor range */
247 temp = cpu_temp_both(cpu_id);
248 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
249 temp & 0xff, temp >> 16);
252 #endif /* CONFIG_TAU */
255 * Assume here that all clock rates are the same in a
256 * smp system. -- Cort
259 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
260 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
262 if (ppc_md.show_percpuinfo != NULL)
263 ppc_md.show_percpuinfo(m, cpu_id);
265 /* If we are a Freescale core do a simple check so
266 * we dont have to keep adding cases in the future */
267 if (PVR_VER(pvr) & 0x8000) {
268 switch (PVR_VER(pvr)) {
269 case 0x8000: /* 7441/7450/7451, Voyager */
270 case 0x8001: /* 7445/7455, Apollo 6 */
271 case 0x8002: /* 7447/7457, Apollo 7 */
272 case 0x8003: /* 7447A, Apollo 7 PM */
273 case 0x8004: /* 7448, Apollo 8 */
274 case 0x800c: /* 7410, Nitro */
275 maj = ((pvr >> 8) & 0xF);
278 default: /* e500/book-e */
284 switch (PVR_VER(pvr)) {
285 case 0x0020: /* 403 family */
286 maj = PVR_MAJ(pvr) + 1;
289 case 0x1008: /* 740P/750P ?? */
290 maj = ((pvr >> 8) & 0xFF) - 1;
294 maj = (pvr >> 8) & 0xFF;
300 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
301 maj, min, PVR_VER(pvr), PVR_REV(pvr));
304 seq_printf(m, "bogomips\t: %lu.%02lu\n",
305 loops_per_jiffy / (500000/HZ),
306 (loops_per_jiffy / (5000/HZ)) % 100);
315 /* If this is the last cpu, print the summary */
316 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
317 show_cpuinfo_summary(m);
322 static void *c_start(struct seq_file *m, loff_t *pos)
324 if (*pos == 0) /* just in case, cpu 0 is not the first */
325 *pos = cpumask_first(cpu_online_mask);
327 *pos = cpumask_next(*pos - 1, cpu_online_mask);
328 if ((*pos) < nr_cpu_ids)
329 return (void *)(unsigned long)(*pos + 1);
333 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
336 return c_start(m, pos);
339 static void c_stop(struct seq_file *m, void *v)
343 const struct seq_operations cpuinfo_op = {
347 .show = show_cpuinfo,
350 void __init check_for_initrd(void)
352 #ifdef CONFIG_BLK_DEV_INITRD
353 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
354 initrd_start, initrd_end);
356 /* If we were passed an initrd, set the ROOT_DEV properly if the values
357 * look sensible. If not, clear initrd reference.
359 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
360 initrd_end > initrd_start)
361 ROOT_DEV = Root_RAM0;
363 initrd_start = initrd_end = 0;
366 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
368 DBG(" <- check_for_initrd()\n");
369 #endif /* CONFIG_BLK_DEV_INITRD */
374 int threads_per_core, threads_shift;
375 cpumask_t threads_core_mask;
377 static void __init cpu_init_thread_core_maps(int tpc)
381 threads_per_core = tpc;
382 threads_core_mask = CPU_MASK_NONE;
384 /* This implementation only supports power of 2 number of threads
385 * for simplicity and performance
387 threads_shift = ilog2(tpc);
388 BUG_ON(tpc != (1 << threads_shift));
390 for (i = 0; i < tpc; i++)
391 cpu_set(i, threads_core_mask);
393 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
394 tpc, tpc > 1 ? "s" : "");
395 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
400 * setup_cpu_maps - initialize the following cpu maps:
404 * Having the possible map set up early allows us to restrict allocations
405 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
407 * We do not initialize the online map here; cpus set their own bits in
408 * cpu_online_mask as they come up.
410 * This function is valid only for Open Firmware systems. finish_device_tree
411 * must be called before using this.
413 * While we're here, we may as well set the "physical" cpu ids in the paca.
415 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
417 void __init smp_setup_cpu_maps(void)
419 struct device_node *dn = NULL;
423 DBG("smp_setup_cpu_maps()\n");
425 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
429 DBG(" * %s...\n", dn->full_name);
431 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
434 nthreads = len / sizeof(int);
435 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
438 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
439 intserv = of_get_property(dn, "reg", NULL);
441 intserv = &cpu; /* assume logical == phys */
444 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
445 DBG(" thread %d -> cpu %d (hard id %d)\n",
447 set_cpu_present(cpu, true);
448 set_hard_smp_processor_id(cpu, intserv[j]);
449 set_cpu_possible(cpu, true);
454 /* If no SMT supported, nthreads is forced to 1 */
455 if (!cpu_has_feature(CPU_FTR_SMT)) {
456 DBG(" SMT disabled ! nthreads forced to 1\n");
462 * On pSeries LPAR, we need to know how many cpus
463 * could possibly be added to this partition.
465 if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
466 (dn = of_find_node_by_path("/rtas"))) {
467 int num_addr_cell, num_size_cell, maxcpus;
468 const unsigned int *ireg;
470 num_addr_cell = of_n_addr_cells(dn);
471 num_size_cell = of_n_size_cells(dn);
473 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
478 maxcpus = ireg[num_addr_cell + num_size_cell];
480 /* Double maxcpus for processors which have SMT capability */
481 if (cpu_has_feature(CPU_FTR_SMT))
484 if (maxcpus > NR_CPUS) {
486 "Partition configured for %d cpus, "
487 "operating system maximum is %d.\n",
491 printk(KERN_INFO "Partition configured for %d cpus.\n",
494 for (cpu = 0; cpu < maxcpus; cpu++)
495 set_cpu_possible(cpu, true);
499 vdso_data->processorCount = num_present_cpus();
500 #endif /* CONFIG_PPC64 */
502 /* Initialize CPU <=> thread mapping/
504 * WARNING: We assume that the number of threads is the same for
505 * every CPU in the system. If that is not the case, then some code
506 * here will have to be reworked
508 cpu_init_thread_core_maps(nthreads);
512 #endif /* CONFIG_SMP */
514 #ifdef CONFIG_PCSPKR_PLATFORM
515 static __init int add_pcspkr(void)
517 struct device_node *np;
518 struct platform_device *pd;
521 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
526 pd = platform_device_alloc("pcspkr", -1);
530 ret = platform_device_add(pd);
532 platform_device_put(pd);
536 device_initcall(add_pcspkr);
537 #endif /* CONFIG_PCSPKR_PLATFORM */
539 void probe_machine(void)
541 extern struct machdep_calls __machine_desc_start;
542 extern struct machdep_calls __machine_desc_end;
545 * Iterate all ppc_md structures until we find the proper
546 * one for the current machine type
548 DBG("Probing machine type ...\n");
550 for (machine_id = &__machine_desc_start;
551 machine_id < &__machine_desc_end;
553 DBG(" %s ...", machine_id->name);
554 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
555 if (ppc_md.probe()) {
561 /* What can we do if we didn't find ? */
562 if (machine_id >= &__machine_desc_end) {
563 DBG("No suitable machine found !\n");
567 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
570 /* Match a class of boards, not a specific device configuration. */
571 int check_legacy_ioport(unsigned long base_port)
573 struct device_node *parent, *np = NULL;
578 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
579 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
581 parent = of_get_parent(np);
583 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
584 if (!of_i8042_kbd_irq)
585 of_i8042_kbd_irq = 1;
587 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
588 if (!of_i8042_aux_irq)
589 of_i8042_aux_irq = 12;
595 np = of_find_node_by_type(NULL, "8042");
596 /* Pegasos has no device_type on its 8042 node, look for the
599 np = of_find_node_by_name(NULL, "8042");
601 case FDC_BASE: /* FDC1 */
602 np = of_find_node_by_type(NULL, "fdc");
604 #ifdef CONFIG_PPC_PREP
611 /* ipmi is supposed to fail here */
616 parent = of_get_parent(np);
618 if (strcmp(parent->type, "isa") == 0)
625 EXPORT_SYMBOL(check_legacy_ioport);
627 static int ppc_panic_event(struct notifier_block *this,
628 unsigned long event, void *ptr)
630 ppc_md.panic(ptr); /* May not return */
634 static struct notifier_block ppc_panic_block = {
635 .notifier_call = ppc_panic_event,
636 .priority = INT_MIN /* may not return; must be done last */
639 void __init setup_panic(void)
641 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
644 #ifdef CONFIG_CHECK_CACHE_COHERENCY
646 * For platforms that have configurable cache-coherency. This function
647 * checks that the cache coherency setting of the kernel matches the setting
648 * left by the firmware, as indicated in the device tree. Since a mismatch
649 * will eventually result in DMA failures, we print * and error and call
650 * BUG() in that case.
653 #ifdef CONFIG_NOT_COHERENT_CACHE
654 #define KERNEL_COHERENCY 0
656 #define KERNEL_COHERENCY 1
659 static int __init check_cache_coherency(void)
661 struct device_node *np;
663 int devtree_coherency;
665 np = of_find_node_by_path("/");
666 prop = of_get_property(np, "coherency-off", NULL);
669 devtree_coherency = prop ? 0 : 1;
671 if (devtree_coherency != KERNEL_COHERENCY) {
673 "kernel coherency:%s != device tree_coherency:%s\n",
674 KERNEL_COHERENCY ? "on" : "off",
675 devtree_coherency ? "on" : "off");
682 late_initcall(check_cache_coherency);
683 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
685 #ifdef CONFIG_DEBUG_FS
686 struct dentry *powerpc_debugfs_root;
687 EXPORT_SYMBOL(powerpc_debugfs_root);
689 static int powerpc_debugfs_init(void)
691 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
693 return powerpc_debugfs_root == NULL;
695 arch_initcall(powerpc_debugfs_init);
698 static int ppc_dflt_bus_notify(struct notifier_block *nb,
699 unsigned long action, void *data)
701 struct device *dev = data;
703 /* We are only intereted in device addition */
704 if (action != BUS_NOTIFY_ADD_DEVICE)
707 set_dma_ops(dev, &dma_direct_ops);
712 static struct notifier_block ppc_dflt_plat_bus_notifier = {
713 .notifier_call = ppc_dflt_bus_notify,
717 static int __init setup_bus_notifier(void)
719 bus_register_notifier(&platform_bus_type, &ppc_dflt_plat_bus_notifier);
723 arch_initcall(setup_bus_notifier);