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>
38 #include <asm/processor.h>
39 #include <asm/vdso_datapage.h>
40 #include <asm/pgtable.h>
43 #include <asm/machdep.h>
45 #include <asm/cputable.h>
46 #include <asm/sections.h>
47 #include <asm/firmware.h>
48 #include <asm/btext.h>
49 #include <asm/nvram.h>
50 #include <asm/setup.h>
51 #include <asm/system.h>
53 #include <asm/iommu.h>
54 #include <asm/serial.h>
55 #include <asm/cache.h>
65 #define DBG(fmt...) udbg_printf(fmt)
70 /* The main machine-dep calls structure
72 struct machdep_calls ppc_md
;
73 EXPORT_SYMBOL(ppc_md
);
74 struct machdep_calls
*machine_id
;
75 EXPORT_SYMBOL(machine_id
);
77 unsigned long klimit
= (unsigned long) _end
;
80 * This still seems to be needed... -- paulus
82 struct screen_info screen_info
= {
85 .orig_video_cols
= 80,
86 .orig_video_lines
= 25,
87 .orig_video_isVGA
= 1,
88 .orig_video_points
= 16
92 /* XXX should go elsewhere eventually */
93 int ppc_do_canonicalize_irqs
;
94 EXPORT_SYMBOL(ppc_do_canonicalize_irqs
);
97 /* also used by kexec */
98 void machine_shutdown(void)
100 if (ppc_md
.machine_shutdown
)
101 ppc_md
.machine_shutdown();
104 void machine_restart(char *cmd
)
112 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
117 void machine_power_off(void)
120 if (ppc_md
.power_off
)
125 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
129 /* Used by the G5 thermal driver */
130 EXPORT_SYMBOL_GPL(machine_power_off
);
132 void (*pm_power_off
)(void) = machine_power_off
;
133 EXPORT_SYMBOL_GPL(pm_power_off
);
135 void machine_halt(void)
143 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
150 extern u32
cpu_temp(unsigned long cpu
);
151 extern u32
cpu_temp_both(unsigned long cpu
);
152 #endif /* CONFIG_TAU */
155 DEFINE_PER_CPU(unsigned int, pvr
);
158 static int show_cpuinfo(struct seq_file
*m
, void *v
)
160 unsigned long cpu_id
= (unsigned long)v
- 1;
165 if (cpu_id
== NR_CPUS
) {
166 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
167 unsigned long bogosum
= 0;
169 for_each_online_cpu(i
)
170 bogosum
+= loops_per_jiffy
;
171 seq_printf(m
, "total bogomips\t: %lu.%02lu\n",
172 bogosum
/(500000/HZ
), bogosum
/(5000/HZ
) % 100);
173 #endif /* CONFIG_SMP && CONFIG_PPC32 */
174 seq_printf(m
, "timebase\t: %lu\n", ppc_tb_freq
);
176 seq_printf(m
, "platform\t: %s\n", ppc_md
.name
);
177 if (ppc_md
.show_cpuinfo
!= NULL
)
178 ppc_md
.show_cpuinfo(m
);
183 /* We only show online cpus: disable preempt (overzealous, I
184 * knew) to prevent cpu going down. */
186 if (!cpu_online(cpu_id
)) {
192 pvr
= per_cpu(pvr
, cpu_id
);
194 pvr
= mfspr(SPRN_PVR
);
196 maj
= (pvr
>> 8) & 0xFF;
199 seq_printf(m
, "processor\t: %lu\n", cpu_id
);
200 seq_printf(m
, "cpu\t\t: ");
202 if (cur_cpu_spec
->pvr_mask
)
203 seq_printf(m
, "%s", cur_cpu_spec
->cpu_name
);
205 seq_printf(m
, "unknown (%08x)", pvr
);
207 #ifdef CONFIG_ALTIVEC
208 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
209 seq_printf(m
, ", altivec supported");
210 #endif /* CONFIG_ALTIVEC */
215 if (cur_cpu_spec
->cpu_features
& CPU_FTR_TAU
) {
216 #ifdef CONFIG_TAU_AVERAGE
217 /* more straightforward, but potentially misleading */
218 seq_printf(m
, "temperature \t: %u C (uncalibrated)\n",
221 /* show the actual temp sensor range */
223 temp
= cpu_temp_both(cpu_id
);
224 seq_printf(m
, "temperature \t: %u-%u C (uncalibrated)\n",
225 temp
& 0xff, temp
>> 16);
228 #endif /* CONFIG_TAU */
231 * Assume here that all clock rates are the same in a
232 * smp system. -- Cort
235 seq_printf(m
, "clock\t\t: %lu.%06luMHz\n",
236 ppc_proc_freq
/ 1000000, ppc_proc_freq
% 1000000);
238 if (ppc_md
.show_percpuinfo
!= NULL
)
239 ppc_md
.show_percpuinfo(m
, cpu_id
);
241 /* If we are a Freescale core do a simple check so
242 * we dont have to keep adding cases in the future */
243 if (PVR_VER(pvr
) & 0x8000) {
247 switch (PVR_VER(pvr
)) {
248 case 0x0020: /* 403 family */
249 maj
= PVR_MAJ(pvr
) + 1;
252 case 0x1008: /* 740P/750P ?? */
253 maj
= ((pvr
>> 8) & 0xFF) - 1;
257 maj
= (pvr
>> 8) & 0xFF;
263 seq_printf(m
, "revision\t: %hd.%hd (pvr %04x %04x)\n",
264 maj
, min
, PVR_VER(pvr
), PVR_REV(pvr
));
267 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
268 loops_per_jiffy
/ (500000/HZ
),
269 (loops_per_jiffy
/ (5000/HZ
)) % 100);
280 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
282 unsigned long i
= *pos
;
284 return i
<= NR_CPUS
? (void *)(i
+ 1) : NULL
;
287 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
290 return c_start(m
, pos
);
293 static void c_stop(struct seq_file
*m
, void *v
)
297 struct seq_operations cpuinfo_op
= {
301 .show
= show_cpuinfo
,
304 void __init
check_for_initrd(void)
306 #ifdef CONFIG_BLK_DEV_INITRD
307 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
308 initrd_start
, initrd_end
);
310 /* If we were passed an initrd, set the ROOT_DEV properly if the values
311 * look sensible. If not, clear initrd reference.
313 if (is_kernel_addr(initrd_start
) && is_kernel_addr(initrd_end
) &&
314 initrd_end
> initrd_start
)
315 ROOT_DEV
= Root_RAM0
;
317 initrd_start
= initrd_end
= 0;
320 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
322 DBG(" <- check_for_initrd()\n");
323 #endif /* CONFIG_BLK_DEV_INITRD */
329 * setup_cpu_maps - initialize the following cpu maps:
334 * Having the possible map set up early allows us to restrict allocations
335 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
337 * We do not initialize the online map here; cpus set their own bits in
338 * cpu_online_map as they come up.
340 * This function is valid only for Open Firmware systems. finish_device_tree
341 * must be called before using this.
343 * While we're here, we may as well set the "physical" cpu ids in the paca.
345 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
347 void __init
smp_setup_cpu_maps(void)
349 struct device_node
*dn
= NULL
;
352 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< NR_CPUS
) {
354 int j
, len
= sizeof(u32
), nthreads
= 1;
356 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s",
359 nthreads
= len
/ sizeof(int);
361 intserv
= of_get_property(dn
, "reg", NULL
);
363 intserv
= &cpu
; /* assume logical == phys */
366 for (j
= 0; j
< nthreads
&& cpu
< NR_CPUS
; j
++) {
367 cpu_set(cpu
, cpu_present_map
);
368 set_hard_smp_processor_id(cpu
, intserv
[j
]);
369 cpu_set(cpu
, cpu_possible_map
);
376 * On pSeries LPAR, we need to know how many cpus
377 * could possibly be added to this partition.
379 if (machine_is(pseries
) && firmware_has_feature(FW_FEATURE_LPAR
) &&
380 (dn
= of_find_node_by_path("/rtas"))) {
381 int num_addr_cell
, num_size_cell
, maxcpus
;
382 const unsigned int *ireg
;
384 num_addr_cell
= of_n_addr_cells(dn
);
385 num_size_cell
= of_n_size_cells(dn
);
387 ireg
= of_get_property(dn
, "ibm,lrdr-capacity", NULL
);
392 maxcpus
= ireg
[num_addr_cell
+ num_size_cell
];
394 /* Double maxcpus for processors which have SMT capability */
395 if (cpu_has_feature(CPU_FTR_SMT
))
398 if (maxcpus
> NR_CPUS
) {
400 "Partition configured for %d cpus, "
401 "operating system maximum is %d.\n",
405 printk(KERN_INFO
"Partition configured for %d cpus.\n",
408 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
409 cpu_set(cpu
, cpu_possible_map
);
415 * Do the sibling map; assume only two threads per processor.
417 for_each_possible_cpu(cpu
) {
418 cpu_set(cpu
, cpu_sibling_map
[cpu
]);
419 if (cpu_has_feature(CPU_FTR_SMT
))
420 cpu_set(cpu
^ 0x1, cpu_sibling_map
[cpu
]);
423 vdso_data
->processorCount
= num_present_cpus();
424 #endif /* CONFIG_PPC64 */
426 #endif /* CONFIG_SMP */
428 static __init
int add_pcspkr(void)
430 struct device_node
*np
;
431 struct platform_device
*pd
;
434 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,100");
439 pd
= platform_device_alloc("pcspkr", -1);
443 ret
= platform_device_add(pd
);
445 platform_device_put(pd
);
449 device_initcall(add_pcspkr
);
451 void probe_machine(void)
453 extern struct machdep_calls __machine_desc_start
;
454 extern struct machdep_calls __machine_desc_end
;
457 * Iterate all ppc_md structures until we find the proper
458 * one for the current machine type
460 DBG("Probing machine type ...\n");
462 for (machine_id
= &__machine_desc_start
;
463 machine_id
< &__machine_desc_end
;
465 DBG(" %s ...", machine_id
->name
);
466 memcpy(&ppc_md
, machine_id
, sizeof(struct machdep_calls
));
467 if (ppc_md
.probe()) {
473 /* What can we do if we didn't find ? */
474 if (machine_id
>= &__machine_desc_end
) {
475 DBG("No suitable machine found !\n");
479 printk(KERN_INFO
"Using %s machine description\n", ppc_md
.name
);
482 /* Match a class of boards, not a specific device configuration. */
483 int check_legacy_ioport(unsigned long base_port
)
485 struct device_node
*parent
, *np
= NULL
;
490 if (!(np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,303")))
491 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,f03");
493 parent
= of_get_parent(np
);
498 np
= of_find_node_by_type(NULL
, "8042");
499 /* Pegasos has no device_type on its 8042 node, look for the
502 np
= of_find_node_by_name(NULL
, "8042");
504 case FDC_BASE
: /* FDC1 */
505 np
= of_find_node_by_type(NULL
, "fdc");
507 #ifdef CONFIG_PPC_PREP
514 /* ipmi is supposed to fail here */
519 parent
= of_get_parent(np
);
521 if (strcmp(parent
->type
, "isa") == 0)
528 EXPORT_SYMBOL(check_legacy_ioport
);
530 static int ppc_panic_event(struct notifier_block
*this,
531 unsigned long event
, void *ptr
)
533 ppc_md
.panic(ptr
); /* May not return */
537 static struct notifier_block ppc_panic_block
= {
538 .notifier_call
= ppc_panic_event
,
539 .priority
= INT_MIN
/* may not return; must be done last */
542 void __init
setup_panic(void)
544 atomic_notifier_chain_register(&panic_notifier_list
, &ppc_panic_block
);
547 #ifdef CONFIG_CHECK_CACHE_COHERENCY
549 * For platforms that have configurable cache-coherency. This function
550 * checks that the cache coherency setting of the kernel matches the setting
551 * left by the firmware, as indicated in the device tree. Since a mismatch
552 * will eventually result in DMA failures, we print * and error and call
553 * BUG() in that case.
556 #ifdef CONFIG_NOT_COHERENT_CACHE
557 #define KERNEL_COHERENCY 0
559 #define KERNEL_COHERENCY 1
562 static int __init
check_cache_coherency(void)
564 struct device_node
*np
;
566 int devtree_coherency
;
568 np
= of_find_node_by_path("/");
569 prop
= of_get_property(np
, "coherency-off", NULL
);
572 devtree_coherency
= prop
? 0 : 1;
574 if (devtree_coherency
!= KERNEL_COHERENCY
) {
576 "kernel coherency:%s != device tree_coherency:%s\n",
577 KERNEL_COHERENCY
? "on" : "off",
578 devtree_coherency
? "on" : "off");
585 late_initcall(check_cache_coherency
);
586 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
588 #ifdef CONFIG_DEBUG_FS
589 struct dentry
*powerpc_debugfs_root
;
591 static int powerpc_debugfs_init(void)
593 powerpc_debugfs_root
= debugfs_create_dir("powerpc", NULL
);
595 return powerpc_debugfs_root
== NULL
;
597 arch_initcall(powerpc_debugfs_init
);