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
);