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;
215 unsigned long proc_freq
;
219 /* We only show online cpus: disable preempt (overzealous, I
220 * knew) to prevent cpu going down. */
222 if (!cpu_online(cpu_id
)) {
228 pvr
= per_cpu(cpu_pvr
, cpu_id
);
230 pvr
= mfspr(SPRN_PVR
);
232 maj
= (pvr
>> 8) & 0xFF;
235 seq_printf(m
, "processor\t: %lu\n", cpu_id
);
236 seq_printf(m
, "cpu\t\t: ");
238 if (cur_cpu_spec
->pvr_mask
)
239 seq_printf(m
, "%s", cur_cpu_spec
->cpu_name
);
241 seq_printf(m
, "unknown (%08x)", pvr
);
243 #ifdef CONFIG_ALTIVEC
244 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
245 seq_printf(m
, ", altivec supported");
246 #endif /* CONFIG_ALTIVEC */
251 if (cur_cpu_spec
->cpu_features
& CPU_FTR_TAU
) {
252 #ifdef CONFIG_TAU_AVERAGE
253 /* more straightforward, but potentially misleading */
254 seq_printf(m
, "temperature \t: %u C (uncalibrated)\n",
257 /* show the actual temp sensor range */
259 temp
= cpu_temp_both(cpu_id
);
260 seq_printf(m
, "temperature \t: %u-%u C (uncalibrated)\n",
261 temp
& 0xff, temp
>> 16);
264 #endif /* CONFIG_TAU */
267 * Platforms that have variable clock rates, should implement
268 * the method ppc_md.get_proc_freq() that reports the clock
269 * rate of a given cpu. The rest can use ppc_proc_freq to
270 * report the clock rate that is same across all cpus.
272 if (ppc_md
.get_proc_freq
)
273 proc_freq
= ppc_md
.get_proc_freq(cpu_id
);
275 proc_freq
= ppc_proc_freq
;
278 seq_printf(m
, "clock\t\t: %lu.%06luMHz\n",
279 proc_freq
/ 1000000, proc_freq
% 1000000);
281 if (ppc_md
.show_percpuinfo
!= NULL
)
282 ppc_md
.show_percpuinfo(m
, cpu_id
);
284 /* If we are a Freescale core do a simple check so
285 * we dont have to keep adding cases in the future */
286 if (PVR_VER(pvr
) & 0x8000) {
287 switch (PVR_VER(pvr
)) {
288 case 0x8000: /* 7441/7450/7451, Voyager */
289 case 0x8001: /* 7445/7455, Apollo 6 */
290 case 0x8002: /* 7447/7457, Apollo 7 */
291 case 0x8003: /* 7447A, Apollo 7 PM */
292 case 0x8004: /* 7448, Apollo 8 */
293 case 0x800c: /* 7410, Nitro */
294 maj
= ((pvr
>> 8) & 0xF);
297 default: /* e500/book-e */
303 switch (PVR_VER(pvr
)) {
304 case 0x0020: /* 403 family */
305 maj
= PVR_MAJ(pvr
) + 1;
308 case 0x1008: /* 740P/750P ?? */
309 maj
= ((pvr
>> 8) & 0xFF) - 1;
313 maj
= (pvr
>> 8) & 0xFF;
319 seq_printf(m
, "revision\t: %hd.%hd (pvr %04x %04x)\n",
320 maj
, min
, PVR_VER(pvr
), PVR_REV(pvr
));
323 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
324 loops_per_jiffy
/ (500000/HZ
),
325 (loops_per_jiffy
/ (5000/HZ
)) % 100);
334 /* If this is the last cpu, print the summary */
335 if (cpumask_next(cpu_id
, cpu_online_mask
) >= nr_cpu_ids
)
336 show_cpuinfo_summary(m
);
341 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
343 if (*pos
== 0) /* just in case, cpu 0 is not the first */
344 *pos
= cpumask_first(cpu_online_mask
);
346 *pos
= cpumask_next(*pos
- 1, cpu_online_mask
);
347 if ((*pos
) < nr_cpu_ids
)
348 return (void *)(unsigned long)(*pos
+ 1);
352 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
355 return c_start(m
, pos
);
358 static void c_stop(struct seq_file
*m
, void *v
)
362 const struct seq_operations cpuinfo_op
= {
366 .show
= show_cpuinfo
,
369 void __init
check_for_initrd(void)
371 #ifdef CONFIG_BLK_DEV_INITRD
372 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
373 initrd_start
, initrd_end
);
375 /* If we were passed an initrd, set the ROOT_DEV properly if the values
376 * look sensible. If not, clear initrd reference.
378 if (is_kernel_addr(initrd_start
) && is_kernel_addr(initrd_end
) &&
379 initrd_end
> initrd_start
)
380 ROOT_DEV
= Root_RAM0
;
382 initrd_start
= initrd_end
= 0;
385 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
387 DBG(" <- check_for_initrd()\n");
388 #endif /* CONFIG_BLK_DEV_INITRD */
393 int threads_per_core
, threads_per_subcore
, threads_shift
;
394 cpumask_t threads_core_mask
;
395 EXPORT_SYMBOL_GPL(threads_per_core
);
396 EXPORT_SYMBOL_GPL(threads_per_subcore
);
397 EXPORT_SYMBOL_GPL(threads_shift
);
398 EXPORT_SYMBOL_GPL(threads_core_mask
);
400 static void __init
cpu_init_thread_core_maps(int tpc
)
404 threads_per_core
= tpc
;
405 threads_per_subcore
= tpc
;
406 cpumask_clear(&threads_core_mask
);
408 /* This implementation only supports power of 2 number of threads
409 * for simplicity and performance
411 threads_shift
= ilog2(tpc
);
412 BUG_ON(tpc
!= (1 << threads_shift
));
414 for (i
= 0; i
< tpc
; i
++)
415 cpumask_set_cpu(i
, &threads_core_mask
);
417 printk(KERN_INFO
"CPU maps initialized for %d thread%s per core\n",
418 tpc
, tpc
> 1 ? "s" : "");
419 printk(KERN_DEBUG
" (thread shift is %d)\n", threads_shift
);
424 * setup_cpu_maps - initialize the following cpu maps:
428 * Having the possible map set up early allows us to restrict allocations
429 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
431 * We do not initialize the online map here; cpus set their own bits in
432 * cpu_online_mask as they come up.
434 * This function is valid only for Open Firmware systems. finish_device_tree
435 * must be called before using this.
437 * While we're here, we may as well set the "physical" cpu ids in the paca.
439 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
441 void __init
smp_setup_cpu_maps(void)
443 struct device_node
*dn
= NULL
;
447 DBG("smp_setup_cpu_maps()\n");
449 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< nr_cpu_ids
) {
450 const __be32
*intserv
;
454 DBG(" * %s...\n", dn
->full_name
);
456 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s",
459 nthreads
= len
/ sizeof(int);
460 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
463 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
464 intserv
= of_get_property(dn
, "reg", NULL
);
466 cpu_be
= cpu_to_be32(cpu
);
467 intserv
= &cpu_be
; /* assume logical == phys */
471 for (j
= 0; j
< nthreads
&& cpu
< nr_cpu_ids
; j
++) {
472 DBG(" thread %d -> cpu %d (hard id %d)\n",
473 j
, cpu
, be32_to_cpu(intserv
[j
]));
474 set_cpu_present(cpu
, true);
475 set_hard_smp_processor_id(cpu
, be32_to_cpu(intserv
[j
]));
476 set_cpu_possible(cpu
, true);
481 /* If no SMT supported, nthreads is forced to 1 */
482 if (!cpu_has_feature(CPU_FTR_SMT
)) {
483 DBG(" SMT disabled ! nthreads forced to 1\n");
489 * On pSeries LPAR, we need to know how many cpus
490 * could possibly be added to this partition.
492 if (machine_is(pseries
) && firmware_has_feature(FW_FEATURE_LPAR
) &&
493 (dn
= of_find_node_by_path("/rtas"))) {
494 int num_addr_cell
, num_size_cell
, maxcpus
;
497 num_addr_cell
= of_n_addr_cells(dn
);
498 num_size_cell
= of_n_size_cells(dn
);
500 ireg
= of_get_property(dn
, "ibm,lrdr-capacity", NULL
);
505 maxcpus
= be32_to_cpup(ireg
+ num_addr_cell
+ num_size_cell
);
507 /* Double maxcpus for processors which have SMT capability */
508 if (cpu_has_feature(CPU_FTR_SMT
))
511 if (maxcpus
> nr_cpu_ids
) {
513 "Partition configured for %d cpus, "
514 "operating system maximum is %d.\n",
515 maxcpus
, nr_cpu_ids
);
516 maxcpus
= nr_cpu_ids
;
518 printk(KERN_INFO
"Partition configured for %d cpus.\n",
521 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
522 set_cpu_possible(cpu
, true);
526 vdso_data
->processorCount
= num_present_cpus();
527 #endif /* CONFIG_PPC64 */
529 /* Initialize CPU <=> thread mapping/
531 * WARNING: We assume that the number of threads is the same for
532 * every CPU in the system. If that is not the case, then some code
533 * here will have to be reworked
535 cpu_init_thread_core_maps(nthreads
);
537 /* Now that possible cpus are set, set nr_cpu_ids for later use */
542 #endif /* CONFIG_SMP */
544 #ifdef CONFIG_PCSPKR_PLATFORM
545 static __init
int add_pcspkr(void)
547 struct device_node
*np
;
548 struct platform_device
*pd
;
551 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,100");
556 pd
= platform_device_alloc("pcspkr", -1);
560 ret
= platform_device_add(pd
);
562 platform_device_put(pd
);
566 device_initcall(add_pcspkr
);
567 #endif /* CONFIG_PCSPKR_PLATFORM */
569 void probe_machine(void)
571 extern struct machdep_calls __machine_desc_start
;
572 extern struct machdep_calls __machine_desc_end
;
575 * Iterate all ppc_md structures until we find the proper
576 * one for the current machine type
578 DBG("Probing machine type ...\n");
580 for (machine_id
= &__machine_desc_start
;
581 machine_id
< &__machine_desc_end
;
583 DBG(" %s ...", machine_id
->name
);
584 memcpy(&ppc_md
, machine_id
, sizeof(struct machdep_calls
));
585 if (ppc_md
.probe()) {
591 /* What can we do if we didn't find ? */
592 if (machine_id
>= &__machine_desc_end
) {
593 DBG("No suitable machine found !\n");
597 printk(KERN_INFO
"Using %s machine description\n", ppc_md
.name
);
600 /* Match a class of boards, not a specific device configuration. */
601 int check_legacy_ioport(unsigned long base_port
)
603 struct device_node
*parent
, *np
= NULL
;
608 if (!(np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,303")))
609 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,f03");
611 parent
= of_get_parent(np
);
613 of_i8042_kbd_irq
= irq_of_parse_and_map(parent
, 0);
614 if (!of_i8042_kbd_irq
)
615 of_i8042_kbd_irq
= 1;
617 of_i8042_aux_irq
= irq_of_parse_and_map(parent
, 1);
618 if (!of_i8042_aux_irq
)
619 of_i8042_aux_irq
= 12;
625 np
= of_find_node_by_type(NULL
, "8042");
626 /* Pegasos has no device_type on its 8042 node, look for the
629 np
= of_find_node_by_name(NULL
, "8042");
631 of_i8042_kbd_irq
= 1;
632 of_i8042_aux_irq
= 12;
635 case FDC_BASE
: /* FDC1 */
636 np
= of_find_node_by_type(NULL
, "fdc");
639 /* ipmi is supposed to fail here */
644 parent
= of_get_parent(np
);
646 if (strcmp(parent
->type
, "isa") == 0)
653 EXPORT_SYMBOL(check_legacy_ioport
);
655 static int ppc_panic_event(struct notifier_block
*this,
656 unsigned long event
, void *ptr
)
659 * If firmware-assisted dump has been registered then trigger
660 * firmware-assisted dump and let firmware handle everything else.
662 crash_fadump(NULL
, ptr
);
663 ppc_md
.panic(ptr
); /* May not return */
667 static struct notifier_block ppc_panic_block
= {
668 .notifier_call
= ppc_panic_event
,
669 .priority
= INT_MIN
/* may not return; must be done last */
672 void __init
setup_panic(void)
674 atomic_notifier_chain_register(&panic_notifier_list
, &ppc_panic_block
);
677 #ifdef CONFIG_CHECK_CACHE_COHERENCY
679 * For platforms that have configurable cache-coherency. This function
680 * checks that the cache coherency setting of the kernel matches the setting
681 * left by the firmware, as indicated in the device tree. Since a mismatch
682 * will eventually result in DMA failures, we print * and error and call
683 * BUG() in that case.
686 #ifdef CONFIG_NOT_COHERENT_CACHE
687 #define KERNEL_COHERENCY 0
689 #define KERNEL_COHERENCY 1
692 static int __init
check_cache_coherency(void)
694 struct device_node
*np
;
696 int devtree_coherency
;
698 np
= of_find_node_by_path("/");
699 prop
= of_get_property(np
, "coherency-off", NULL
);
702 devtree_coherency
= prop
? 0 : 1;
704 if (devtree_coherency
!= KERNEL_COHERENCY
) {
706 "kernel coherency:%s != device tree_coherency:%s\n",
707 KERNEL_COHERENCY
? "on" : "off",
708 devtree_coherency
? "on" : "off");
715 late_initcall(check_cache_coherency
);
716 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
718 #ifdef CONFIG_DEBUG_FS
719 struct dentry
*powerpc_debugfs_root
;
720 EXPORT_SYMBOL(powerpc_debugfs_root
);
722 static int powerpc_debugfs_init(void)
724 powerpc_debugfs_root
= debugfs_create_dir("powerpc", NULL
);
726 return powerpc_debugfs_root
== NULL
;
728 arch_initcall(powerpc_debugfs_init
);
731 #ifdef CONFIG_BOOKE_WDT
732 extern u32 booke_wdt_enabled
;
733 extern u32 booke_wdt_period
;
735 /* Checks wdt=x and wdt_period=xx command-line option */
736 notrace
int __init
early_parse_wdt(char *p
)
738 if (p
&& strncmp(p
, "0", 1) != 0)
739 booke_wdt_enabled
= 1;
743 early_param("wdt", early_parse_wdt
);
745 int __init
early_parse_wdt_period(char *p
)
749 if (!kstrtol(p
, 0, &ret
))
750 booke_wdt_period
= ret
;
755 early_param("wdt_period", early_parse_wdt_period
);
756 #endif /* CONFIG_BOOKE_WDT */
758 void ppc_printk_progress(char *s
, unsigned short hex
)
763 void arch_setup_pdev_archdata(struct platform_device
*pdev
)
765 pdev
->archdata
.dma_mask
= DMA_BIT_MASK(32);
766 pdev
->dev
.dma_mask
= &pdev
->archdata
.dma_mask
;
767 set_dma_ops(&pdev
->dev
, &dma_direct_ops
);