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
98 /* XXX should go elsewhere eventually */
99 int ppc_do_canonicalize_irqs
;
100 EXPORT_SYMBOL(ppc_do_canonicalize_irqs
);
103 /* also used by kexec */
104 void machine_shutdown(void)
106 if (ppc_md
.machine_shutdown
)
107 ppc_md
.machine_shutdown();
110 void machine_restart(char *cmd
)
118 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
123 void machine_power_off(void)
126 if (ppc_md
.power_off
)
131 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
135 /* Used by the G5 thermal driver */
136 EXPORT_SYMBOL_GPL(machine_power_off
);
138 void (*pm_power_off
)(void) = machine_power_off
;
139 EXPORT_SYMBOL_GPL(pm_power_off
);
141 void machine_halt(void)
149 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
156 extern u32
cpu_temp(unsigned long cpu
);
157 extern u32
cpu_temp_both(unsigned long cpu
);
158 #endif /* CONFIG_TAU */
161 DEFINE_PER_CPU(unsigned int, cpu_pvr
);
164 static void show_cpuinfo_summary(struct seq_file
*m
)
166 struct device_node
*root
;
167 const char *model
= NULL
;
168 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
169 unsigned long bogosum
= 0;
171 for_each_online_cpu(i
)
172 bogosum
+= loops_per_jiffy
;
173 seq_printf(m
, "total bogomips\t: %lu.%02lu\n",
174 bogosum
/(500000/HZ
), bogosum
/(5000/HZ
) % 100);
175 #endif /* CONFIG_SMP && CONFIG_PPC32 */
176 seq_printf(m
, "timebase\t: %lu\n", ppc_tb_freq
);
178 seq_printf(m
, "platform\t: %s\n", ppc_md
.name
);
179 root
= of_find_node_by_path("/");
181 model
= of_get_property(root
, "model", NULL
);
183 seq_printf(m
, "model\t\t: %s\n", model
);
186 if (ppc_md
.show_cpuinfo
!= NULL
)
187 ppc_md
.show_cpuinfo(m
);
190 /* Display the amount of memory */
191 seq_printf(m
, "Memory\t\t: %d MB\n",
192 (unsigned int)(total_memory
/ (1024 * 1024)));
196 static int show_cpuinfo(struct seq_file
*m
, void *v
)
198 unsigned long cpu_id
= (unsigned long)v
- 1;
203 /* We only show online cpus: disable preempt (overzealous, I
204 * knew) to prevent cpu going down. */
206 if (!cpu_online(cpu_id
)) {
212 pvr
= per_cpu(cpu_pvr
, cpu_id
);
214 pvr
= mfspr(SPRN_PVR
);
216 maj
= (pvr
>> 8) & 0xFF;
219 seq_printf(m
, "processor\t: %lu\n", cpu_id
);
220 seq_printf(m
, "cpu\t\t: ");
222 if (cur_cpu_spec
->pvr_mask
)
223 seq_printf(m
, "%s", cur_cpu_spec
->cpu_name
);
225 seq_printf(m
, "unknown (%08x)", pvr
);
227 #ifdef CONFIG_ALTIVEC
228 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
229 seq_printf(m
, ", altivec supported");
230 #endif /* CONFIG_ALTIVEC */
235 if (cur_cpu_spec
->cpu_features
& CPU_FTR_TAU
) {
236 #ifdef CONFIG_TAU_AVERAGE
237 /* more straightforward, but potentially misleading */
238 seq_printf(m
, "temperature \t: %u C (uncalibrated)\n",
241 /* show the actual temp sensor range */
243 temp
= cpu_temp_both(cpu_id
);
244 seq_printf(m
, "temperature \t: %u-%u C (uncalibrated)\n",
245 temp
& 0xff, temp
>> 16);
248 #endif /* CONFIG_TAU */
251 * Assume here that all clock rates are the same in a
252 * smp system. -- Cort
255 seq_printf(m
, "clock\t\t: %lu.%06luMHz\n",
256 ppc_proc_freq
/ 1000000, ppc_proc_freq
% 1000000);
258 if (ppc_md
.show_percpuinfo
!= NULL
)
259 ppc_md
.show_percpuinfo(m
, cpu_id
);
261 /* If we are a Freescale core do a simple check so
262 * we dont have to keep adding cases in the future */
263 if (PVR_VER(pvr
) & 0x8000) {
264 switch (PVR_VER(pvr
)) {
265 case 0x8000: /* 7441/7450/7451, Voyager */
266 case 0x8001: /* 7445/7455, Apollo 6 */
267 case 0x8002: /* 7447/7457, Apollo 7 */
268 case 0x8003: /* 7447A, Apollo 7 PM */
269 case 0x8004: /* 7448, Apollo 8 */
270 case 0x800c: /* 7410, Nitro */
271 maj
= ((pvr
>> 8) & 0xF);
274 default: /* e500/book-e */
280 switch (PVR_VER(pvr
)) {
281 case 0x0020: /* 403 family */
282 maj
= PVR_MAJ(pvr
) + 1;
285 case 0x1008: /* 740P/750P ?? */
286 maj
= ((pvr
>> 8) & 0xFF) - 1;
290 maj
= (pvr
>> 8) & 0xFF;
296 seq_printf(m
, "revision\t: %hd.%hd (pvr %04x %04x)\n",
297 maj
, min
, PVR_VER(pvr
), PVR_REV(pvr
));
300 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
301 loops_per_jiffy
/ (500000/HZ
),
302 (loops_per_jiffy
/ (5000/HZ
)) % 100);
311 /* If this is the last cpu, print the summary */
312 if (cpumask_next(cpu_id
, cpu_online_mask
) >= nr_cpu_ids
)
313 show_cpuinfo_summary(m
);
318 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
320 if (*pos
== 0) /* just in case, cpu 0 is not the first */
321 *pos
= cpumask_first(cpu_online_mask
);
323 *pos
= cpumask_next(*pos
- 1, cpu_online_mask
);
324 if ((*pos
) < nr_cpu_ids
)
325 return (void *)(unsigned long)(*pos
+ 1);
329 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
332 return c_start(m
, pos
);
335 static void c_stop(struct seq_file
*m
, void *v
)
339 const struct seq_operations cpuinfo_op
= {
343 .show
= show_cpuinfo
,
346 void __init
check_for_initrd(void)
348 #ifdef CONFIG_BLK_DEV_INITRD
349 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
350 initrd_start
, initrd_end
);
352 /* If we were passed an initrd, set the ROOT_DEV properly if the values
353 * look sensible. If not, clear initrd reference.
355 if (is_kernel_addr(initrd_start
) && is_kernel_addr(initrd_end
) &&
356 initrd_end
> initrd_start
)
357 ROOT_DEV
= Root_RAM0
;
359 initrd_start
= initrd_end
= 0;
362 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
364 DBG(" <- check_for_initrd()\n");
365 #endif /* CONFIG_BLK_DEV_INITRD */
370 int threads_per_core
, threads_shift
;
371 cpumask_t threads_core_mask
;
373 static void __init
cpu_init_thread_core_maps(int tpc
)
377 threads_per_core
= tpc
;
378 threads_core_mask
= CPU_MASK_NONE
;
380 /* This implementation only supports power of 2 number of threads
381 * for simplicity and performance
383 threads_shift
= ilog2(tpc
);
384 BUG_ON(tpc
!= (1 << threads_shift
));
386 for (i
= 0; i
< tpc
; i
++)
387 cpu_set(i
, threads_core_mask
);
389 printk(KERN_INFO
"CPU maps initialized for %d thread%s per core\n",
390 tpc
, tpc
> 1 ? "s" : "");
391 printk(KERN_DEBUG
" (thread shift is %d)\n", threads_shift
);
396 * setup_cpu_maps - initialize the following cpu maps:
400 * Having the possible map set up early allows us to restrict allocations
401 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
403 * We do not initialize the online map here; cpus set their own bits in
404 * cpu_online_mask as they come up.
406 * This function is valid only for Open Firmware systems. finish_device_tree
407 * must be called before using this.
409 * While we're here, we may as well set the "physical" cpu ids in the paca.
411 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
413 void __init
smp_setup_cpu_maps(void)
415 struct device_node
*dn
= NULL
;
419 DBG("smp_setup_cpu_maps()\n");
421 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< NR_CPUS
) {
425 DBG(" * %s...\n", dn
->full_name
);
427 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s",
430 nthreads
= len
/ sizeof(int);
431 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
434 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
435 intserv
= of_get_property(dn
, "reg", NULL
);
437 intserv
= &cpu
; /* assume logical == phys */
440 for (j
= 0; j
< nthreads
&& cpu
< NR_CPUS
; j
++) {
441 DBG(" thread %d -> cpu %d (hard id %d)\n",
443 set_cpu_present(cpu
, true);
444 set_hard_smp_processor_id(cpu
, intserv
[j
]);
445 set_cpu_possible(cpu
, true);
450 /* If no SMT supported, nthreads is forced to 1 */
451 if (!cpu_has_feature(CPU_FTR_SMT
)) {
452 DBG(" SMT disabled ! nthreads forced to 1\n");
458 * On pSeries LPAR, we need to know how many cpus
459 * could possibly be added to this partition.
461 if (machine_is(pseries
) && firmware_has_feature(FW_FEATURE_LPAR
) &&
462 (dn
= of_find_node_by_path("/rtas"))) {
463 int num_addr_cell
, num_size_cell
, maxcpus
;
464 const unsigned int *ireg
;
466 num_addr_cell
= of_n_addr_cells(dn
);
467 num_size_cell
= of_n_size_cells(dn
);
469 ireg
= of_get_property(dn
, "ibm,lrdr-capacity", NULL
);
474 maxcpus
= ireg
[num_addr_cell
+ num_size_cell
];
476 /* Double maxcpus for processors which have SMT capability */
477 if (cpu_has_feature(CPU_FTR_SMT
))
480 if (maxcpus
> NR_CPUS
) {
482 "Partition configured for %d cpus, "
483 "operating system maximum is %d.\n",
487 printk(KERN_INFO
"Partition configured for %d cpus.\n",
490 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
491 set_cpu_possible(cpu
, true);
495 vdso_data
->processorCount
= num_present_cpus();
496 #endif /* CONFIG_PPC64 */
498 /* Initialize CPU <=> thread mapping/
500 * WARNING: We assume that the number of threads is the same for
501 * every CPU in the system. If that is not the case, then some code
502 * here will have to be reworked
504 cpu_init_thread_core_maps(nthreads
);
508 #endif /* CONFIG_SMP */
510 #ifdef CONFIG_PCSPKR_PLATFORM
511 static __init
int add_pcspkr(void)
513 struct device_node
*np
;
514 struct platform_device
*pd
;
517 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,100");
522 pd
= platform_device_alloc("pcspkr", -1);
526 ret
= platform_device_add(pd
);
528 platform_device_put(pd
);
532 device_initcall(add_pcspkr
);
533 #endif /* CONFIG_PCSPKR_PLATFORM */
535 void probe_machine(void)
537 extern struct machdep_calls __machine_desc_start
;
538 extern struct machdep_calls __machine_desc_end
;
541 * Iterate all ppc_md structures until we find the proper
542 * one for the current machine type
544 DBG("Probing machine type ...\n");
546 for (machine_id
= &__machine_desc_start
;
547 machine_id
< &__machine_desc_end
;
549 DBG(" %s ...", machine_id
->name
);
550 memcpy(&ppc_md
, machine_id
, sizeof(struct machdep_calls
));
551 if (ppc_md
.probe()) {
557 /* What can we do if we didn't find ? */
558 if (machine_id
>= &__machine_desc_end
) {
559 DBG("No suitable machine found !\n");
563 printk(KERN_INFO
"Using %s machine description\n", ppc_md
.name
);
566 /* Match a class of boards, not a specific device configuration. */
567 int check_legacy_ioport(unsigned long base_port
)
569 struct device_node
*parent
, *np
= NULL
;
574 if (!(np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,303")))
575 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,f03");
577 parent
= of_get_parent(np
);
582 np
= of_find_node_by_type(NULL
, "8042");
583 /* Pegasos has no device_type on its 8042 node, look for the
586 np
= of_find_node_by_name(NULL
, "8042");
588 case FDC_BASE
: /* FDC1 */
589 np
= of_find_node_by_type(NULL
, "fdc");
591 #ifdef CONFIG_PPC_PREP
598 /* ipmi is supposed to fail here */
603 parent
= of_get_parent(np
);
605 if (strcmp(parent
->type
, "isa") == 0)
612 EXPORT_SYMBOL(check_legacy_ioport
);
614 static int ppc_panic_event(struct notifier_block
*this,
615 unsigned long event
, void *ptr
)
617 ppc_md
.panic(ptr
); /* May not return */
621 static struct notifier_block ppc_panic_block
= {
622 .notifier_call
= ppc_panic_event
,
623 .priority
= INT_MIN
/* may not return; must be done last */
626 void __init
setup_panic(void)
628 atomic_notifier_chain_register(&panic_notifier_list
, &ppc_panic_block
);
631 #ifdef CONFIG_CHECK_CACHE_COHERENCY
633 * For platforms that have configurable cache-coherency. This function
634 * checks that the cache coherency setting of the kernel matches the setting
635 * left by the firmware, as indicated in the device tree. Since a mismatch
636 * will eventually result in DMA failures, we print * and error and call
637 * BUG() in that case.
640 #ifdef CONFIG_NOT_COHERENT_CACHE
641 #define KERNEL_COHERENCY 0
643 #define KERNEL_COHERENCY 1
646 static int __init
check_cache_coherency(void)
648 struct device_node
*np
;
650 int devtree_coherency
;
652 np
= of_find_node_by_path("/");
653 prop
= of_get_property(np
, "coherency-off", NULL
);
656 devtree_coherency
= prop
? 0 : 1;
658 if (devtree_coherency
!= KERNEL_COHERENCY
) {
660 "kernel coherency:%s != device tree_coherency:%s\n",
661 KERNEL_COHERENCY
? "on" : "off",
662 devtree_coherency
? "on" : "off");
669 late_initcall(check_cache_coherency
);
670 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
672 #ifdef CONFIG_DEBUG_FS
673 struct dentry
*powerpc_debugfs_root
;
674 EXPORT_SYMBOL(powerpc_debugfs_root
);
676 static int powerpc_debugfs_init(void)
678 powerpc_debugfs_root
= debugfs_create_dir("powerpc", NULL
);
680 return powerpc_debugfs_root
== NULL
;
682 arch_initcall(powerpc_debugfs_init
);
685 static int ppc_dflt_bus_notify(struct notifier_block
*nb
,
686 unsigned long action
, void *data
)
688 struct device
*dev
= data
;
690 /* We are only intereted in device addition */
691 if (action
!= BUS_NOTIFY_ADD_DEVICE
)
694 set_dma_ops(dev
, &dma_direct_ops
);
699 static struct notifier_block ppc_dflt_plat_bus_notifier
= {
700 .notifier_call
= ppc_dflt_bus_notify
,
704 static struct notifier_block ppc_dflt_of_bus_notifier
= {
705 .notifier_call
= ppc_dflt_bus_notify
,
709 static int __init
setup_bus_notifier(void)
711 bus_register_notifier(&platform_bus_type
, &ppc_dflt_plat_bus_notifier
);
712 bus_register_notifier(&of_platform_bus_type
, &ppc_dflt_of_bus_notifier
);
717 arch_initcall(setup_bus_notifier
);