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>
40 #include <asm/processor.h>
41 #include <asm/vdso_datapage.h>
42 #include <asm/pgtable.h>
45 #include <asm/machdep.h>
47 #include <asm/cputable.h>
48 #include <asm/sections.h>
49 #include <asm/firmware.h>
50 #include <asm/btext.h>
51 #include <asm/nvram.h>
52 #include <asm/setup.h>
53 #include <asm/system.h>
55 #include <asm/iommu.h>
56 #include <asm/serial.h>
57 #include <asm/cache.h>
61 #include <asm/cputhreads.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
);
79 unsigned long klimit
= (unsigned long) _end
;
81 char cmd_line
[COMMAND_LINE_SIZE
];
84 * This still seems to be needed... -- paulus
86 struct screen_info screen_info
= {
89 .orig_video_cols
= 80,
90 .orig_video_lines
= 25,
91 .orig_video_isVGA
= 1,
92 .orig_video_points
= 16
96 /* XXX should go elsewhere eventually */
97 int ppc_do_canonicalize_irqs
;
98 EXPORT_SYMBOL(ppc_do_canonicalize_irqs
);
101 /* also used by kexec */
102 void machine_shutdown(void)
104 if (ppc_md
.machine_shutdown
)
105 ppc_md
.machine_shutdown();
108 void machine_restart(char *cmd
)
116 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
121 void machine_power_off(void)
124 if (ppc_md
.power_off
)
129 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
133 /* Used by the G5 thermal driver */
134 EXPORT_SYMBOL_GPL(machine_power_off
);
136 void (*pm_power_off
)(void) = machine_power_off
;
137 EXPORT_SYMBOL_GPL(pm_power_off
);
139 void machine_halt(void)
147 printk(KERN_EMERG
"System Halted, OK to turn off power\n");
154 extern u32
cpu_temp(unsigned long cpu
);
155 extern u32
cpu_temp_both(unsigned long cpu
);
156 #endif /* CONFIG_TAU */
159 DEFINE_PER_CPU(unsigned int, pvr
);
162 static int show_cpuinfo(struct seq_file
*m
, void *v
)
164 unsigned long cpu_id
= (unsigned long)v
- 1;
169 if (cpu_id
== NR_CPUS
) {
170 struct device_node
*root
;
171 const char *model
= NULL
;
172 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
173 unsigned long bogosum
= 0;
175 for_each_online_cpu(i
)
176 bogosum
+= loops_per_jiffy
;
177 seq_printf(m
, "total bogomips\t: %lu.%02lu\n",
178 bogosum
/(500000/HZ
), bogosum
/(5000/HZ
) % 100);
179 #endif /* CONFIG_SMP && CONFIG_PPC32 */
180 seq_printf(m
, "timebase\t: %lu\n", ppc_tb_freq
);
182 seq_printf(m
, "platform\t: %s\n", ppc_md
.name
);
183 root
= of_find_node_by_path("/");
185 model
= of_get_property(root
, "model", NULL
);
187 seq_printf(m
, "model\t\t: %s\n", model
);
190 if (ppc_md
.show_cpuinfo
!= NULL
)
191 ppc_md
.show_cpuinfo(m
);
196 /* We only show online cpus: disable preempt (overzealous, I
197 * knew) to prevent cpu going down. */
199 if (!cpu_online(cpu_id
)) {
205 pvr
= per_cpu(pvr
, cpu_id
);
207 pvr
= mfspr(SPRN_PVR
);
209 maj
= (pvr
>> 8) & 0xFF;
212 seq_printf(m
, "processor\t: %lu\n", cpu_id
);
213 seq_printf(m
, "cpu\t\t: ");
215 if (cur_cpu_spec
->pvr_mask
)
216 seq_printf(m
, "%s", cur_cpu_spec
->cpu_name
);
218 seq_printf(m
, "unknown (%08x)", pvr
);
220 #ifdef CONFIG_ALTIVEC
221 if (cpu_has_feature(CPU_FTR_ALTIVEC
))
222 seq_printf(m
, ", altivec supported");
223 #endif /* CONFIG_ALTIVEC */
228 if (cur_cpu_spec
->cpu_features
& CPU_FTR_TAU
) {
229 #ifdef CONFIG_TAU_AVERAGE
230 /* more straightforward, but potentially misleading */
231 seq_printf(m
, "temperature \t: %u C (uncalibrated)\n",
234 /* show the actual temp sensor range */
236 temp
= cpu_temp_both(cpu_id
);
237 seq_printf(m
, "temperature \t: %u-%u C (uncalibrated)\n",
238 temp
& 0xff, temp
>> 16);
241 #endif /* CONFIG_TAU */
244 * Assume here that all clock rates are the same in a
245 * smp system. -- Cort
248 seq_printf(m
, "clock\t\t: %lu.%06luMHz\n",
249 ppc_proc_freq
/ 1000000, ppc_proc_freq
% 1000000);
251 if (ppc_md
.show_percpuinfo
!= NULL
)
252 ppc_md
.show_percpuinfo(m
, cpu_id
);
254 /* If we are a Freescale core do a simple check so
255 * we dont have to keep adding cases in the future */
256 if (PVR_VER(pvr
) & 0x8000) {
260 switch (PVR_VER(pvr
)) {
261 case 0x0020: /* 403 family */
262 maj
= PVR_MAJ(pvr
) + 1;
265 case 0x1008: /* 740P/750P ?? */
266 maj
= ((pvr
>> 8) & 0xFF) - 1;
270 maj
= (pvr
>> 8) & 0xFF;
276 seq_printf(m
, "revision\t: %hd.%hd (pvr %04x %04x)\n",
277 maj
, min
, PVR_VER(pvr
), PVR_REV(pvr
));
280 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
281 loops_per_jiffy
/ (500000/HZ
),
282 (loops_per_jiffy
/ (5000/HZ
)) % 100);
293 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
295 unsigned long i
= *pos
;
297 return i
<= NR_CPUS
? (void *)(i
+ 1) : NULL
;
300 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
303 return c_start(m
, pos
);
306 static void c_stop(struct seq_file
*m
, void *v
)
310 struct seq_operations cpuinfo_op
= {
314 .show
= show_cpuinfo
,
317 void __init
check_for_initrd(void)
319 #ifdef CONFIG_BLK_DEV_INITRD
320 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
321 initrd_start
, initrd_end
);
323 /* If we were passed an initrd, set the ROOT_DEV properly if the values
324 * look sensible. If not, clear initrd reference.
326 if (is_kernel_addr(initrd_start
) && is_kernel_addr(initrd_end
) &&
327 initrd_end
> initrd_start
)
328 ROOT_DEV
= Root_RAM0
;
330 initrd_start
= initrd_end
= 0;
333 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
335 DBG(" <- check_for_initrd()\n");
336 #endif /* CONFIG_BLK_DEV_INITRD */
341 int threads_per_core
, threads_shift
;
342 cpumask_t threads_core_mask
;
344 static void __init
cpu_init_thread_core_maps(int tpc
)
348 threads_per_core
= tpc
;
349 threads_core_mask
= CPU_MASK_NONE
;
351 /* This implementation only supports power of 2 number of threads
352 * for simplicity and performance
354 threads_shift
= ilog2(tpc
);
355 BUG_ON(tpc
!= (1 << threads_shift
));
357 for (i
= 0; i
< tpc
; i
++)
358 cpu_set(i
, threads_core_mask
);
360 printk(KERN_INFO
"CPU maps initialized for %d thread%s per core\n",
361 tpc
, tpc
> 1 ? "s" : "");
362 printk(KERN_DEBUG
" (thread shift is %d)\n", threads_shift
);
367 * setup_cpu_maps - initialize the following cpu maps:
372 * Having the possible map set up early allows us to restrict allocations
373 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
375 * We do not initialize the online map here; cpus set their own bits in
376 * cpu_online_map as they come up.
378 * This function is valid only for Open Firmware systems. finish_device_tree
379 * must be called before using this.
381 * While we're here, we may as well set the "physical" cpu ids in the paca.
383 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
385 void __init
smp_setup_cpu_maps(void)
387 struct device_node
*dn
= NULL
;
391 DBG("smp_setup_cpu_maps()\n");
393 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< NR_CPUS
) {
397 DBG(" * %s...\n", dn
->full_name
);
399 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s",
402 nthreads
= len
/ sizeof(int);
403 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
406 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
407 intserv
= of_get_property(dn
, "reg", NULL
);
409 intserv
= &cpu
; /* assume logical == phys */
412 for (j
= 0; j
< nthreads
&& cpu
< NR_CPUS
; j
++) {
413 DBG(" thread %d -> cpu %d (hard id %d)\n",
415 cpu_set(cpu
, cpu_present_map
);
416 set_hard_smp_processor_id(cpu
, intserv
[j
]);
417 cpu_set(cpu
, cpu_possible_map
);
422 /* If no SMT supported, nthreads is forced to 1 */
423 if (!cpu_has_feature(CPU_FTR_SMT
)) {
424 DBG(" SMT disabled ! nthreads forced to 1\n");
430 * On pSeries LPAR, we need to know how many cpus
431 * could possibly be added to this partition.
433 if (machine_is(pseries
) && firmware_has_feature(FW_FEATURE_LPAR
) &&
434 (dn
= of_find_node_by_path("/rtas"))) {
435 int num_addr_cell
, num_size_cell
, maxcpus
;
436 const unsigned int *ireg
;
438 num_addr_cell
= of_n_addr_cells(dn
);
439 num_size_cell
= of_n_size_cells(dn
);
441 ireg
= of_get_property(dn
, "ibm,lrdr-capacity", NULL
);
446 maxcpus
= ireg
[num_addr_cell
+ num_size_cell
];
448 /* Double maxcpus for processors which have SMT capability */
449 if (cpu_has_feature(CPU_FTR_SMT
))
452 if (maxcpus
> NR_CPUS
) {
454 "Partition configured for %d cpus, "
455 "operating system maximum is %d.\n",
459 printk(KERN_INFO
"Partition configured for %d cpus.\n",
462 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
463 cpu_set(cpu
, cpu_possible_map
);
467 vdso_data
->processorCount
= num_present_cpus();
468 #endif /* CONFIG_PPC64 */
470 /* Initialize CPU <=> thread mapping/
472 * WARNING: We assume that the number of threads is the same for
473 * every CPU in the system. If that is not the case, then some code
474 * here will have to be reworked
476 cpu_init_thread_core_maps(nthreads
);
480 * Being that cpu_sibling_map is now a per_cpu array, then it cannot
481 * be initialized until the per_cpu areas have been created. This
482 * function is now called from setup_per_cpu_areas().
484 void __init
smp_setup_cpu_sibling_map(void)
489 for_each_possible_cpu(cpu
) {
490 DBG("Sibling map for CPU %d:", cpu
);
491 base
= cpu_first_thread_in_core(cpu
);
492 for (i
= 0; i
< threads_per_core
; i
++) {
493 cpu_set(base
+ i
, per_cpu(cpu_sibling_map
, cpu
));
494 DBG(" %d", base
+ i
);
499 #endif /* CONFIG_PPC64 */
501 #endif /* CONFIG_SMP */
503 #ifdef CONFIG_PCSPKR_PLATFORM
504 static __init
int add_pcspkr(void)
506 struct device_node
*np
;
507 struct platform_device
*pd
;
510 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,100");
515 pd
= platform_device_alloc("pcspkr", -1);
519 ret
= platform_device_add(pd
);
521 platform_device_put(pd
);
525 device_initcall(add_pcspkr
);
526 #endif /* CONFIG_PCSPKR_PLATFORM */
528 void probe_machine(void)
530 extern struct machdep_calls __machine_desc_start
;
531 extern struct machdep_calls __machine_desc_end
;
534 * Iterate all ppc_md structures until we find the proper
535 * one for the current machine type
537 DBG("Probing machine type ...\n");
539 for (machine_id
= &__machine_desc_start
;
540 machine_id
< &__machine_desc_end
;
542 DBG(" %s ...", machine_id
->name
);
543 memcpy(&ppc_md
, machine_id
, sizeof(struct machdep_calls
));
544 if (ppc_md
.probe()) {
550 /* What can we do if we didn't find ? */
551 if (machine_id
>= &__machine_desc_end
) {
552 DBG("No suitable machine found !\n");
556 printk(KERN_INFO
"Using %s machine description\n", ppc_md
.name
);
559 /* Match a class of boards, not a specific device configuration. */
560 int check_legacy_ioport(unsigned long base_port
)
562 struct device_node
*parent
, *np
= NULL
;
567 if (!(np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,303")))
568 np
= of_find_compatible_node(NULL
, NULL
, "pnpPNP,f03");
570 parent
= of_get_parent(np
);
575 np
= of_find_node_by_type(NULL
, "8042");
576 /* Pegasos has no device_type on its 8042 node, look for the
579 np
= of_find_node_by_name(NULL
, "8042");
581 case FDC_BASE
: /* FDC1 */
582 np
= of_find_node_by_type(NULL
, "fdc");
584 #ifdef CONFIG_PPC_PREP
591 /* ipmi is supposed to fail here */
596 parent
= of_get_parent(np
);
598 if (strcmp(parent
->type
, "isa") == 0)
605 EXPORT_SYMBOL(check_legacy_ioport
);
607 static int ppc_panic_event(struct notifier_block
*this,
608 unsigned long event
, void *ptr
)
610 ppc_md
.panic(ptr
); /* May not return */
614 static struct notifier_block ppc_panic_block
= {
615 .notifier_call
= ppc_panic_event
,
616 .priority
= INT_MIN
/* may not return; must be done last */
619 void __init
setup_panic(void)
621 atomic_notifier_chain_register(&panic_notifier_list
, &ppc_panic_block
);
624 #ifdef CONFIG_CHECK_CACHE_COHERENCY
626 * For platforms that have configurable cache-coherency. This function
627 * checks that the cache coherency setting of the kernel matches the setting
628 * left by the firmware, as indicated in the device tree. Since a mismatch
629 * will eventually result in DMA failures, we print * and error and call
630 * BUG() in that case.
633 #ifdef CONFIG_NOT_COHERENT_CACHE
634 #define KERNEL_COHERENCY 0
636 #define KERNEL_COHERENCY 1
639 static int __init
check_cache_coherency(void)
641 struct device_node
*np
;
643 int devtree_coherency
;
645 np
= of_find_node_by_path("/");
646 prop
= of_get_property(np
, "coherency-off", NULL
);
649 devtree_coherency
= prop
? 0 : 1;
651 if (devtree_coherency
!= KERNEL_COHERENCY
) {
653 "kernel coherency:%s != device tree_coherency:%s\n",
654 KERNEL_COHERENCY
? "on" : "off",
655 devtree_coherency
? "on" : "off");
662 late_initcall(check_cache_coherency
);
663 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
665 #ifdef CONFIG_DEBUG_FS
666 struct dentry
*powerpc_debugfs_root
;
668 static int powerpc_debugfs_init(void)
670 powerpc_debugfs_root
= debugfs_create_dir("powerpc", NULL
);
672 return powerpc_debugfs_root
== NULL
;
674 arch_initcall(powerpc_debugfs_init
);