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
;
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 #ifdef CONFIG_FA_DUMP
115 * if fadump is active, cleanup the fadump registration before we
121 if (ppc_md
.machine_shutdown
)
122 ppc_md
.machine_shutdown();
125 void machine_restart(char *cmd
)
133 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
138 void machine_power_off(void)
141 if (ppc_md
.power_off
)
146 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
150 /* Used by the G5 thermal driver */
151 EXPORT_SYMBOL_GPL(machine_power_off
);
153 void (*pm_power_off
)(void) = machine_power_off
;
154 EXPORT_SYMBOL_GPL(pm_power_off
);
156 void machine_halt(void)
164 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
171 extern u32
cpu_temp(unsigned long cpu
);
172 extern u32
cpu_temp_both(unsigned long cpu
);
173 #endif /* CONFIG_TAU */
176 DEFINE_PER_CPU(unsigned int, cpu_pvr
);
179 static void show_cpuinfo_summary(struct seq_file
*m
)
181 struct device_node
*root
;
182 const char *model
= NULL
;
183 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
184 unsigned long bogosum
= 0;
186 for_each_online_cpu(i
)
187 bogosum
+= loops_per_jiffy
;
188 seq_printf(m
, "total bogomips\t: %lu.%02lu\n",
189 bogosum
/(500000/HZ
), bogosum
/(5000/HZ
) % 100);
190 #endif /* CONFIG_SMP && CONFIG_PPC32 */
191 seq_printf(m
, "timebase\t: %lu\n", ppc_tb_freq
);
193 seq_printf(m
, "platform\t: %s\n", ppc_md
.name
);
194 root
= of_find_node_by_path("/");
196 model
= of_get_property(root
, "model", NULL
);
198 seq_printf(m
, "model\t\t: %s\n", model
);
201 if (ppc_md
.show_cpuinfo
!= NULL
)
202 ppc_md
.show_cpuinfo(m
);
205 /* Display the amount of memory */
206 seq_printf(m
, "Memory\t\t: %d MB\n",
207 (unsigned int)(total_memory
/ (1024 * 1024)));
211 static int show_cpuinfo(struct seq_file
*m
, void *v
)
213 unsigned long cpu_id
= (unsigned long)v
- 1;
218 /* We only show online cpus: disable preempt (overzealous, I
219 * knew) to prevent cpu going down. */
221 if (!cpu_online(cpu_id
)) {
227 pvr
= per_cpu(cpu_pvr
, cpu_id
);
229 pvr
= mfspr(SPRN_PVR
);
231 maj
= (pvr
>> 8) & 0xFF;
234 seq_printf(m
, "processor\t: %lu\n", cpu_id
);
235 seq_printf(m
, "cpu\t\t: ");
237 if (cur_cpu_spec
->pvr_mask
)
238 seq_printf(m
, "%s", cur_cpu_spec
->cpu_name
);
240 seq_printf(m
, "unknown (%08x)", pvr
);
242 #ifdef CONFIG_ALTIVEC
243 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
244 seq_printf(m
, ", altivec supported");
245 #endif /* CONFIG_ALTIVEC */
250 if (cur_cpu_spec
->cpu_features
& CPU_FTR_TAU
) {
251 #ifdef CONFIG_TAU_AVERAGE
252 /* more straightforward, but potentially misleading */
253 seq_printf(m
, "temperature \t: %u C (uncalibrated)\n",
256 /* show the actual temp sensor range */
258 temp
= cpu_temp_both(cpu_id
);
259 seq_printf(m
, "temperature \t: %u-%u C (uncalibrated)\n",
260 temp
& 0xff, temp
>> 16);
263 #endif /* CONFIG_TAU */
266 * Assume here that all clock rates are the same in a
267 * smp system. -- Cort
270 seq_printf(m
, "clock\t\t: %lu.%06luMHz\n",
271 ppc_proc_freq
/ 1000000, ppc_proc_freq
% 1000000);
273 if (ppc_md
.show_percpuinfo
!= NULL
)
274 ppc_md
.show_percpuinfo(m
, cpu_id
);
276 /* If we are a Freescale core do a simple check so
277 * we dont have to keep adding cases in the future */
278 if (PVR_VER(pvr
) & 0x8000) {
279 switch (PVR_VER(pvr
)) {
280 case 0x8000: /* 7441/7450/7451, Voyager */
281 case 0x8001: /* 7445/7455, Apollo 6 */
282 case 0x8002: /* 7447/7457, Apollo 7 */
283 case 0x8003: /* 7447A, Apollo 7 PM */
284 case 0x8004: /* 7448, Apollo 8 */
285 case 0x800c: /* 7410, Nitro */
286 maj
= ((pvr
>> 8) & 0xF);
289 default: /* e500/book-e */
295 switch (PVR_VER(pvr
)) {
296 case 0x0020: /* 403 family */
297 maj
= PVR_MAJ(pvr
) + 1;
300 case 0x1008: /* 740P/750P ?? */
301 maj
= ((pvr
>> 8) & 0xFF) - 1;
305 maj
= (pvr
>> 8) & 0xFF;
311 seq_printf(m
, "revision\t: %hd.%hd (pvr %04x %04x)\n",
312 maj
, min
, PVR_VER(pvr
), PVR_REV(pvr
));
315 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
316 loops_per_jiffy
/ (500000/HZ
),
317 (loops_per_jiffy
/ (5000/HZ
)) % 100);
326 /* If this is the last cpu, print the summary */
327 if (cpumask_next(cpu_id
, cpu_online_mask
) >= nr_cpu_ids
)
328 show_cpuinfo_summary(m
);
333 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
335 if (*pos
== 0) /* just in case, cpu 0 is not the first */
336 *pos
= cpumask_first(cpu_online_mask
);
338 *pos
= cpumask_next(*pos
- 1, cpu_online_mask
);
339 if ((*pos
) < nr_cpu_ids
)
340 return (void *)(unsigned long)(*pos
+ 1);
344 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
347 return c_start(m
, pos
);
350 static void c_stop(struct seq_file
*m
, void *v
)
354 const struct seq_operations cpuinfo_op
= {
358 .show
= show_cpuinfo
,
361 void __init
check_for_initrd(void)
363 #ifdef CONFIG_BLK_DEV_INITRD
364 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
365 initrd_start
, initrd_end
);
367 /* If we were passed an initrd, set the ROOT_DEV properly if the values
368 * look sensible. If not, clear initrd reference.
370 if (is_kernel_addr(initrd_start
) && is_kernel_addr(initrd_end
) &&
371 initrd_end
> initrd_start
)
372 ROOT_DEV
= Root_RAM0
;
374 initrd_start
= initrd_end
= 0;
377 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
379 DBG(" <- check_for_initrd()\n");
380 #endif /* CONFIG_BLK_DEV_INITRD */
385 int threads_per_core
, threads_shift
;
386 cpumask_t threads_core_mask
;
387 EXPORT_SYMBOL_GPL(threads_per_core
);
388 EXPORT_SYMBOL_GPL(threads_shift
);
389 EXPORT_SYMBOL_GPL(threads_core_mask
);
391 static void __init
cpu_init_thread_core_maps(int tpc
)
395 threads_per_core
= tpc
;
396 cpumask_clear(&threads_core_mask
);
398 /* This implementation only supports power of 2 number of threads
399 * for simplicity and performance
401 threads_shift
= ilog2(tpc
);
402 BUG_ON(tpc
!= (1 << threads_shift
));
404 for (i
= 0; i
< tpc
; i
++)
405 cpumask_set_cpu(i
, &threads_core_mask
);
407 printk(KERN_INFO
"CPU maps initialized for %d thread%s per core\n",
408 tpc
, tpc
> 1 ? "s" : "");
409 printk(KERN_DEBUG
" (thread shift is %d)\n", threads_shift
);
414 * setup_cpu_maps - initialize the following cpu maps:
418 * Having the possible map set up early allows us to restrict allocations
419 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
421 * We do not initialize the online map here; cpus set their own bits in
422 * cpu_online_mask as they come up.
424 * This function is valid only for Open Firmware systems. finish_device_tree
425 * must be called before using this.
427 * While we're here, we may as well set the "physical" cpu ids in the paca.
429 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
431 void __init
smp_setup_cpu_maps(void)
433 struct device_node
*dn
= NULL
;
437 DBG("smp_setup_cpu_maps()\n");
439 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< nr_cpu_ids
) {
440 const __be32
*intserv
;
444 DBG(" * %s...\n", dn
->full_name
);
446 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s",
449 nthreads
= len
/ sizeof(int);
450 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
453 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
454 intserv
= of_get_property(dn
, "reg", NULL
);
456 cpu_be
= cpu_to_be32(cpu
);
457 intserv
= &cpu_be
; /* assume logical == phys */
461 for (j
= 0; j
< nthreads
&& cpu
< nr_cpu_ids
; j
++) {
462 DBG(" thread %d -> cpu %d (hard id %d)\n",
463 j
, cpu
, be32_to_cpu(intserv
[j
]));
464 set_cpu_present(cpu
, true);
465 set_hard_smp_processor_id(cpu
, be32_to_cpu(intserv
[j
]));
466 set_cpu_possible(cpu
, true);
471 /* If no SMT supported, nthreads is forced to 1 */
472 if (!cpu_has_feature(CPU_FTR_SMT
)) {
473 DBG(" SMT disabled ! nthreads forced to 1\n");
479 * On pSeries LPAR, we need to know how many cpus
480 * could possibly be added to this partition.
482 if (machine_is(pseries
) && firmware_has_feature(FW_FEATURE_LPAR
) &&
483 (dn
= of_find_node_by_path("/rtas"))) {
484 int num_addr_cell
, num_size_cell
, maxcpus
;
487 num_addr_cell
= of_n_addr_cells(dn
);
488 num_size_cell
= of_n_size_cells(dn
);
490 ireg
= of_get_property(dn
, "ibm,lrdr-capacity", NULL
);
495 maxcpus
= be32_to_cpup(ireg
+ num_addr_cell
+ num_size_cell
);
497 /* Double maxcpus for processors which have SMT capability */
498 if (cpu_has_feature(CPU_FTR_SMT
))
501 if (maxcpus
> nr_cpu_ids
) {
503 "Partition configured for %d cpus, "
504 "operating system maximum is %d.\n",
505 maxcpus
, nr_cpu_ids
);
506 maxcpus
= nr_cpu_ids
;
508 printk(KERN_INFO
"Partition configured for %d cpus.\n",
511 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
512 set_cpu_possible(cpu
, true);
516 vdso_data
->processorCount
= num_present_cpus();
517 #endif /* CONFIG_PPC64 */
519 /* Initialize CPU <=> thread mapping/
521 * WARNING: We assume that the number of threads is the same for
522 * every CPU in the system. If that is not the case, then some code
523 * here will have to be reworked
525 cpu_init_thread_core_maps(nthreads
);
527 /* Now that possible cpus are set, set nr_cpu_ids for later use */
532 #endif /* CONFIG_SMP */
534 #ifdef CONFIG_PCSPKR_PLATFORM
535 static __init
int add_pcspkr(void)
537 struct device_node
*np
;
538 struct platform_device
*pd
;
541 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,100");
546 pd
= platform_device_alloc("pcspkr", -1);
550 ret
= platform_device_add(pd
);
552 platform_device_put(pd
);
556 device_initcall(add_pcspkr
);
557 #endif /* CONFIG_PCSPKR_PLATFORM */
559 void probe_machine(void)
561 extern struct machdep_calls __machine_desc_start
;
562 extern struct machdep_calls __machine_desc_end
;
565 * Iterate all ppc_md structures until we find the proper
566 * one for the current machine type
568 DBG("Probing machine type ...\n");
570 for (machine_id
= &__machine_desc_start
;
571 machine_id
< &__machine_desc_end
;
573 DBG(" %s ...", machine_id
->name
);
574 memcpy(&ppc_md
, machine_id
, sizeof(struct machdep_calls
));
575 if (ppc_md
.probe()) {
581 /* What can we do if we didn't find ? */
582 if (machine_id
>= &__machine_desc_end
) {
583 DBG("No suitable machine found !\n");
587 printk(KERN_INFO
"Using %s machine description\n", ppc_md
.name
);
590 /* Match a class of boards, not a specific device configuration. */
591 int check_legacy_ioport(unsigned long base_port
)
593 struct device_node
*parent
, *np
= NULL
;
598 if (!(np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,303")))
599 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,f03");
601 parent
= of_get_parent(np
);
603 of_i8042_kbd_irq
= irq_of_parse_and_map(parent
, 0);
604 if (!of_i8042_kbd_irq
)
605 of_i8042_kbd_irq
= 1;
607 of_i8042_aux_irq
= irq_of_parse_and_map(parent
, 1);
608 if (!of_i8042_aux_irq
)
609 of_i8042_aux_irq
= 12;
615 np
= of_find_node_by_type(NULL
, "8042");
616 /* Pegasos has no device_type on its 8042 node, look for the
619 np
= of_find_node_by_name(NULL
, "8042");
621 of_i8042_kbd_irq
= 1;
622 of_i8042_aux_irq
= 12;
625 case FDC_BASE
: /* FDC1 */
626 np
= of_find_node_by_type(NULL
, "fdc");
629 /* ipmi is supposed to fail here */
634 parent
= of_get_parent(np
);
636 if (strcmp(parent
->type
, "isa") == 0)
643 EXPORT_SYMBOL(check_legacy_ioport
);
645 static int ppc_panic_event(struct notifier_block
*this,
646 unsigned long event
, void *ptr
)
649 * If firmware-assisted dump has been registered then trigger
650 * firmware-assisted dump and let firmware handle everything else.
652 crash_fadump(NULL
, ptr
);
653 ppc_md
.panic(ptr
); /* May not return */
657 static struct notifier_block ppc_panic_block
= {
658 .notifier_call
= ppc_panic_event
,
659 .priority
= INT_MIN
/* may not return; must be done last */
662 void __init
setup_panic(void)
664 atomic_notifier_chain_register(&panic_notifier_list
, &ppc_panic_block
);
667 #ifdef CONFIG_CHECK_CACHE_COHERENCY
669 * For platforms that have configurable cache-coherency. This function
670 * checks that the cache coherency setting of the kernel matches the setting
671 * left by the firmware, as indicated in the device tree. Since a mismatch
672 * will eventually result in DMA failures, we print * and error and call
673 * BUG() in that case.
676 #ifdef CONFIG_NOT_COHERENT_CACHE
677 #define KERNEL_COHERENCY 0
679 #define KERNEL_COHERENCY 1
682 static int __init
check_cache_coherency(void)
684 struct device_node
*np
;
686 int devtree_coherency
;
688 np
= of_find_node_by_path("/");
689 prop
= of_get_property(np
, "coherency-off", NULL
);
692 devtree_coherency
= prop
? 0 : 1;
694 if (devtree_coherency
!= KERNEL_COHERENCY
) {
696 "kernel coherency:%s != device tree_coherency:%s\n",
697 KERNEL_COHERENCY
? "on" : "off",
698 devtree_coherency
? "on" : "off");
705 late_initcall(check_cache_coherency
);
706 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
708 #ifdef CONFIG_DEBUG_FS
709 struct dentry
*powerpc_debugfs_root
;
710 EXPORT_SYMBOL(powerpc_debugfs_root
);
712 static int powerpc_debugfs_init(void)
714 powerpc_debugfs_root
= debugfs_create_dir("powerpc", NULL
);
716 return powerpc_debugfs_root
== NULL
;
718 arch_initcall(powerpc_debugfs_init
);
721 #ifdef CONFIG_BOOKE_WDT
722 extern u32 booke_wdt_enabled
;
723 extern u32 booke_wdt_period
;
725 /* Checks wdt=x and wdt_period=xx command-line option */
726 notrace
int __init
early_parse_wdt(char *p
)
728 if (p
&& strncmp(p
, "0", 1) != 0)
729 booke_wdt_enabled
= 1;
733 early_param("wdt", early_parse_wdt
);
735 int __init
early_parse_wdt_period(char *p
)
739 if (!kstrtol(p
, 0, &ret
))
740 booke_wdt_period
= ret
;
745 early_param("wdt_period", early_parse_wdt_period
);
746 #endif /* CONFIG_BOOKE_WDT */
748 void ppc_printk_progress(char *s
, unsigned short hex
)
753 void arch_setup_pdev_archdata(struct platform_device
*pdev
)
755 pdev
->archdata
.dma_mask
= DMA_BIT_MASK(32);
756 pdev
->dev
.dma_mask
= &pdev
->archdata
.dma_mask
;
757 set_dma_ops(&pdev
->dev
, &dma_direct_ops
);