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/utsname.h>
28 #include <linux/screen_info.h>
29 #include <linux/root_dev.h>
30 #include <linux/notifier.h>
31 #include <linux/cpu.h>
32 #include <linux/unistd.h>
33 #include <linux/serial.h>
34 #include <linux/serial_8250.h>
35 #include <linux/debugfs.h>
36 #include <linux/percpu.h>
37 #include <linux/lmb.h>
38 #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, pvr
);
164 static int show_cpuinfo(struct seq_file
*m
, void *v
)
166 unsigned long cpu_id
= (unsigned long)v
- 1;
171 if (cpu_id
== NR_CPUS
) {
172 struct device_node
*root
;
173 const char *model
= NULL
;
174 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
175 unsigned long bogosum
= 0;
177 for_each_online_cpu(i
)
178 bogosum
+= loops_per_jiffy
;
179 seq_printf(m
, "total bogomips\t: %lu.%02lu\n",
180 bogosum
/(500000/HZ
), bogosum
/(5000/HZ
) % 100);
181 #endif /* CONFIG_SMP && CONFIG_PPC32 */
182 seq_printf(m
, "timebase\t: %lu\n", ppc_tb_freq
);
184 seq_printf(m
, "platform\t: %s\n", ppc_md
.name
);
185 root
= of_find_node_by_path("/");
187 model
= of_get_property(root
, "model", NULL
);
189 seq_printf(m
, "model\t\t: %s\n", model
);
192 if (ppc_md
.show_cpuinfo
!= NULL
)
193 ppc_md
.show_cpuinfo(m
);
196 /* Display the amount of memory */
197 seq_printf(m
, "Memory\t\t: %d MB\n",
198 (unsigned int)(total_memory
/ (1024 * 1024)));
204 /* We only show online cpus: disable preempt (overzealous, I
205 * knew) to prevent cpu going down. */
207 if (!cpu_online(cpu_id
)) {
213 pvr
= per_cpu(pvr
, cpu_id
);
215 pvr
= mfspr(SPRN_PVR
);
217 maj
= (pvr
>> 8) & 0xFF;
220 seq_printf(m
, "processor\t: %lu\n", cpu_id
);
221 seq_printf(m
, "cpu\t\t: ");
223 if (cur_cpu_spec
->pvr_mask
)
224 seq_printf(m
, "%s", cur_cpu_spec
->cpu_name
);
226 seq_printf(m
, "unknown (%08x)", pvr
);
228 #ifdef CONFIG_ALTIVEC
229 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
230 seq_printf(m
, ", altivec supported");
231 #endif /* CONFIG_ALTIVEC */
236 if (cur_cpu_spec
->cpu_features
& CPU_FTR_TAU
) {
237 #ifdef CONFIG_TAU_AVERAGE
238 /* more straightforward, but potentially misleading */
239 seq_printf(m
, "temperature \t: %u C (uncalibrated)\n",
242 /* show the actual temp sensor range */
244 temp
= cpu_temp_both(cpu_id
);
245 seq_printf(m
, "temperature \t: %u-%u C (uncalibrated)\n",
246 temp
& 0xff, temp
>> 16);
249 #endif /* CONFIG_TAU */
252 * Assume here that all clock rates are the same in a
253 * smp system. -- Cort
256 seq_printf(m
, "clock\t\t: %lu.%06luMHz\n",
257 ppc_proc_freq
/ 1000000, ppc_proc_freq
% 1000000);
259 if (ppc_md
.show_percpuinfo
!= NULL
)
260 ppc_md
.show_percpuinfo(m
, cpu_id
);
262 /* If we are a Freescale core do a simple check so
263 * we dont have to keep adding cases in the future */
264 if (PVR_VER(pvr
) & 0x8000) {
265 switch (PVR_VER(pvr
)) {
266 case 0x8000: /* 7441/7450/7451, Voyager */
267 case 0x8001: /* 7445/7455, Apollo 6 */
268 case 0x8002: /* 7447/7457, Apollo 7 */
269 case 0x8003: /* 7447A, Apollo 7 PM */
270 case 0x8004: /* 7448, Apollo 8 */
271 case 0x800c: /* 7410, Nitro */
272 maj
= ((pvr
>> 8) & 0xF);
275 default: /* e500/book-e */
281 switch (PVR_VER(pvr
)) {
282 case 0x0020: /* 403 family */
283 maj
= PVR_MAJ(pvr
) + 1;
286 case 0x1008: /* 740P/750P ?? */
287 maj
= ((pvr
>> 8) & 0xFF) - 1;
291 maj
= (pvr
>> 8) & 0xFF;
297 seq_printf(m
, "revision\t: %hd.%hd (pvr %04x %04x)\n",
298 maj
, min
, PVR_VER(pvr
), PVR_REV(pvr
));
301 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
302 loops_per_jiffy
/ (500000/HZ
),
303 (loops_per_jiffy
/ (5000/HZ
)) % 100);
314 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
316 unsigned long i
= *pos
;
318 return i
<= NR_CPUS
? (void *)(i
+ 1) : NULL
;
321 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
324 return c_start(m
, pos
);
327 static void c_stop(struct seq_file
*m
, void *v
)
331 const struct seq_operations cpuinfo_op
= {
335 .show
= show_cpuinfo
,
338 void __init
check_for_initrd(void)
340 #ifdef CONFIG_BLK_DEV_INITRD
341 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
342 initrd_start
, initrd_end
);
344 /* If we were passed an initrd, set the ROOT_DEV properly if the values
345 * look sensible. If not, clear initrd reference.
347 if (is_kernel_addr(initrd_start
) && is_kernel_addr(initrd_end
) &&
348 initrd_end
> initrd_start
)
349 ROOT_DEV
= Root_RAM0
;
351 initrd_start
= initrd_end
= 0;
354 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
356 DBG(" <- check_for_initrd()\n");
357 #endif /* CONFIG_BLK_DEV_INITRD */
362 int threads_per_core
, threads_shift
;
363 cpumask_t threads_core_mask
;
365 static void __init
cpu_init_thread_core_maps(int tpc
)
369 threads_per_core
= tpc
;
370 threads_core_mask
= CPU_MASK_NONE
;
372 /* This implementation only supports power of 2 number of threads
373 * for simplicity and performance
375 threads_shift
= ilog2(tpc
);
376 BUG_ON(tpc
!= (1 << threads_shift
));
378 for (i
= 0; i
< tpc
; i
++)
379 cpu_set(i
, threads_core_mask
);
381 printk(KERN_INFO
"CPU maps initialized for %d thread%s per core\n",
382 tpc
, tpc
> 1 ? "s" : "");
383 printk(KERN_DEBUG
" (thread shift is %d)\n", threads_shift
);
388 * setup_cpu_maps - initialize the following cpu maps:
392 * Having the possible map set up early allows us to restrict allocations
393 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
395 * We do not initialize the online map here; cpus set their own bits in
396 * cpu_online_map as they come up.
398 * This function is valid only for Open Firmware systems. finish_device_tree
399 * must be called before using this.
401 * While we're here, we may as well set the "physical" cpu ids in the paca.
403 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
405 void __init
smp_setup_cpu_maps(void)
407 struct device_node
*dn
= NULL
;
411 DBG("smp_setup_cpu_maps()\n");
413 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< NR_CPUS
) {
417 DBG(" * %s...\n", dn
->full_name
);
419 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s",
422 nthreads
= len
/ sizeof(int);
423 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
426 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
427 intserv
= of_get_property(dn
, "reg", NULL
);
429 intserv
= &cpu
; /* assume logical == phys */
432 for (j
= 0; j
< nthreads
&& cpu
< NR_CPUS
; j
++) {
433 DBG(" thread %d -> cpu %d (hard id %d)\n",
435 set_cpu_present(cpu
, true);
436 set_hard_smp_processor_id(cpu
, intserv
[j
]);
437 set_cpu_possible(cpu
, true);
442 /* If no SMT supported, nthreads is forced to 1 */
443 if (!cpu_has_feature(CPU_FTR_SMT
)) {
444 DBG(" SMT disabled ! nthreads forced to 1\n");
450 * On pSeries LPAR, we need to know how many cpus
451 * could possibly be added to this partition.
453 if (machine_is(pseries
) && firmware_has_feature(FW_FEATURE_LPAR
) &&
454 (dn
= of_find_node_by_path("/rtas"))) {
455 int num_addr_cell
, num_size_cell
, maxcpus
;
456 const unsigned int *ireg
;
458 num_addr_cell
= of_n_addr_cells(dn
);
459 num_size_cell
= of_n_size_cells(dn
);
461 ireg
= of_get_property(dn
, "ibm,lrdr-capacity", NULL
);
466 maxcpus
= ireg
[num_addr_cell
+ num_size_cell
];
468 /* Double maxcpus for processors which have SMT capability */
469 if (cpu_has_feature(CPU_FTR_SMT
))
472 if (maxcpus
> NR_CPUS
) {
474 "Partition configured for %d cpus, "
475 "operating system maximum is %d.\n",
479 printk(KERN_INFO
"Partition configured for %d cpus.\n",
482 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
483 set_cpu_possible(cpu
, true);
487 vdso_data
->processorCount
= num_present_cpus();
488 #endif /* CONFIG_PPC64 */
490 /* Initialize CPU <=> thread mapping/
492 * WARNING: We assume that the number of threads is the same for
493 * every CPU in the system. If that is not the case, then some code
494 * here will have to be reworked
496 cpu_init_thread_core_maps(nthreads
);
498 #endif /* CONFIG_SMP */
500 #ifdef CONFIG_PCSPKR_PLATFORM
501 static __init
int add_pcspkr(void)
503 struct device_node
*np
;
504 struct platform_device
*pd
;
507 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,100");
512 pd
= platform_device_alloc("pcspkr", -1);
516 ret
= platform_device_add(pd
);
518 platform_device_put(pd
);
522 device_initcall(add_pcspkr
);
523 #endif /* CONFIG_PCSPKR_PLATFORM */
525 void probe_machine(void)
527 extern struct machdep_calls __machine_desc_start
;
528 extern struct machdep_calls __machine_desc_end
;
531 * Iterate all ppc_md structures until we find the proper
532 * one for the current machine type
534 DBG("Probing machine type ...\n");
536 for (machine_id
= &__machine_desc_start
;
537 machine_id
< &__machine_desc_end
;
539 DBG(" %s ...", machine_id
->name
);
540 memcpy(&ppc_md
, machine_id
, sizeof(struct machdep_calls
));
541 if (ppc_md
.probe()) {
547 /* What can we do if we didn't find ? */
548 if (machine_id
>= &__machine_desc_end
) {
549 DBG("No suitable machine found !\n");
553 printk(KERN_INFO
"Using %s machine description\n", ppc_md
.name
);
556 /* Match a class of boards, not a specific device configuration. */
557 int check_legacy_ioport(unsigned long base_port
)
559 struct device_node
*parent
, *np
= NULL
;
564 if (!(np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,303")))
565 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,f03");
567 parent
= of_get_parent(np
);
572 np
= of_find_node_by_type(NULL
, "8042");
573 /* Pegasos has no device_type on its 8042 node, look for the
576 np
= of_find_node_by_name(NULL
, "8042");
578 case FDC_BASE
: /* FDC1 */
579 np
= of_find_node_by_type(NULL
, "fdc");
581 #ifdef CONFIG_PPC_PREP
588 /* ipmi is supposed to fail here */
593 parent
= of_get_parent(np
);
595 if (strcmp(parent
->type
, "isa") == 0)
602 EXPORT_SYMBOL(check_legacy_ioport
);
604 static int ppc_panic_event(struct notifier_block
*this,
605 unsigned long event
, void *ptr
)
607 ppc_md
.panic(ptr
); /* May not return */
611 static struct notifier_block ppc_panic_block
= {
612 .notifier_call
= ppc_panic_event
,
613 .priority
= INT_MIN
/* may not return; must be done last */
616 void __init
setup_panic(void)
618 atomic_notifier_chain_register(&panic_notifier_list
, &ppc_panic_block
);
621 #ifdef CONFIG_CHECK_CACHE_COHERENCY
623 * For platforms that have configurable cache-coherency. This function
624 * checks that the cache coherency setting of the kernel matches the setting
625 * left by the firmware, as indicated in the device tree. Since a mismatch
626 * will eventually result in DMA failures, we print * and error and call
627 * BUG() in that case.
630 #ifdef CONFIG_NOT_COHERENT_CACHE
631 #define KERNEL_COHERENCY 0
633 #define KERNEL_COHERENCY 1
636 static int __init
check_cache_coherency(void)
638 struct device_node
*np
;
640 int devtree_coherency
;
642 np
= of_find_node_by_path("/");
643 prop
= of_get_property(np
, "coherency-off", NULL
);
646 devtree_coherency
= prop
? 0 : 1;
648 if (devtree_coherency
!= KERNEL_COHERENCY
) {
650 "kernel coherency:%s != device tree_coherency:%s\n",
651 KERNEL_COHERENCY
? "on" : "off",
652 devtree_coherency
? "on" : "off");
659 late_initcall(check_cache_coherency
);
660 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
662 #ifdef CONFIG_DEBUG_FS
663 struct dentry
*powerpc_debugfs_root
;
665 static int powerpc_debugfs_init(void)
667 powerpc_debugfs_root
= debugfs_create_dir("powerpc", NULL
);
669 return powerpc_debugfs_root
== NULL
;
671 arch_initcall(powerpc_debugfs_init
);
674 static int ppc_dflt_bus_notify(struct notifier_block
*nb
,
675 unsigned long action
, void *data
)
677 struct device
*dev
= data
;
679 /* We are only intereted in device addition */
680 if (action
!= BUS_NOTIFY_ADD_DEVICE
)
683 set_dma_ops(dev
, &dma_direct_ops
);
688 static struct notifier_block ppc_dflt_plat_bus_notifier
= {
689 .notifier_call
= ppc_dflt_bus_notify
,
693 static struct notifier_block ppc_dflt_of_bus_notifier
= {
694 .notifier_call
= ppc_dflt_bus_notify
,
698 static int __init
setup_bus_notifier(void)
700 bus_register_notifier(&platform_bus_type
, &ppc_dflt_plat_bus_notifier
);
701 bus_register_notifier(&of_platform_bus_type
, &ppc_dflt_of_bus_notifier
);
706 arch_initcall(setup_bus_notifier
);