3 * Common boot and setup code.
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/config.h>
16 #include <linux/module.h>
17 #include <linux/string.h>
18 #include <linux/sched.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/reboot.h>
22 #include <linux/delay.h>
23 #include <linux/initrd.h>
24 #include <linux/ide.h>
25 #include <linux/seq_file.h>
26 #include <linux/ioport.h>
27 #include <linux/console.h>
28 #include <linux/utsname.h>
29 #include <linux/tty.h>
30 #include <linux/root_dev.h>
31 #include <linux/notifier.h>
32 #include <linux/cpu.h>
33 #include <linux/unistd.h>
34 #include <linux/serial.h>
35 #include <linux/serial_8250.h>
38 #include <asm/processor.h>
39 #include <asm/pgtable.h>
42 #include <asm/machdep.h>
45 #include <asm/cputable.h>
46 #include <asm/sections.h>
47 #include <asm/btext.h>
48 #include <asm/nvram.h>
49 #include <asm/setup.h>
50 #include <asm/system.h>
52 #include <asm/iommu.h>
53 #include <asm/serial.h>
54 #include <asm/cache.h>
58 #include <asm/iseries/it_lp_naca.h>
59 #include <asm/firmware.h>
62 #include <asm/kexec.h>
67 #define DBG(fmt...) udbg_printf(fmt)
73 * Here are some early debugging facilities. You can enable one
74 * but your kernel will not boot on anything else if you do so
77 /* This one is for use on LPAR machines that support an HVC console
80 extern void udbg_init_debug_lpar(void);
81 /* This one is for use on Apple G5 machines
83 extern void udbg_init_pmac_realmode(void);
84 /* That's RTAS panel debug */
85 extern void call_rtas_display_status_delay(unsigned char c
);
86 /* Here's maple real mode debug */
87 extern void udbg_init_maple_realmode(void);
89 #define EARLY_DEBUG_INIT() do {} while(0)
92 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
93 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
94 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
95 #define EARLY_DEBUG_INIT() \
96 do { udbg_putc = call_rtas_display_status_delay; } while(0)
101 int boot_cpuid_phys
= 0;
105 /* Pick defaults since we might want to patch instructions
106 * before we've read this from the device tree.
108 struct ppc64_caches ppc64_caches
= {
114 EXPORT_SYMBOL_GPL(ppc64_caches
);
117 * These are used in binfmt_elf.c to put aux entries on the stack
118 * for each elf executable being started.
124 /* The main machine-dep calls structure
126 struct machdep_calls ppc_md
;
127 EXPORT_SYMBOL(ppc_md
);
129 #ifdef CONFIG_MAGIC_SYSRQ
130 unsigned long SYSRQ_KEY
;
131 #endif /* CONFIG_MAGIC_SYSRQ */
134 static int ppc64_panic_event(struct notifier_block
*, unsigned long, void *);
135 static struct notifier_block ppc64_panic_block
= {
136 .notifier_call
= ppc64_panic_event
,
137 .priority
= INT_MIN
/* may not return; must be done last */
142 static int smt_enabled_cmdline
;
144 /* Look for ibm,smt-enabled OF option */
145 static void check_smt_enabled(void)
147 struct device_node
*dn
;
150 /* Allow the command line to overrule the OF option */
151 if (smt_enabled_cmdline
)
154 dn
= of_find_node_by_path("/options");
157 smt_option
= (char *)get_property(dn
, "ibm,smt-enabled", NULL
);
160 if (!strcmp(smt_option
, "on"))
161 smt_enabled_at_boot
= 1;
162 else if (!strcmp(smt_option
, "off"))
163 smt_enabled_at_boot
= 0;
168 /* Look for smt-enabled= cmdline option */
169 static int __init
early_smt_enabled(char *p
)
171 smt_enabled_cmdline
= 1;
176 if (!strcmp(p
, "on") || !strcmp(p
, "1"))
177 smt_enabled_at_boot
= 1;
178 else if (!strcmp(p
, "off") || !strcmp(p
, "0"))
179 smt_enabled_at_boot
= 0;
183 early_param("smt-enabled", early_smt_enabled
);
186 #define check_smt_enabled()
187 #endif /* CONFIG_SMP */
189 extern struct machdep_calls pSeries_md
;
190 extern struct machdep_calls pmac_md
;
191 extern struct machdep_calls maple_md
;
192 extern struct machdep_calls cell_md
;
193 extern struct machdep_calls iseries_md
;
195 /* Ultimately, stuff them in an elf section like initcalls... */
196 static struct machdep_calls __initdata
*machines
[] = {
197 #ifdef CONFIG_PPC_PSERIES
199 #endif /* CONFIG_PPC_PSERIES */
200 #ifdef CONFIG_PPC_PMAC
202 #endif /* CONFIG_PPC_PMAC */
203 #ifdef CONFIG_PPC_MAPLE
205 #endif /* CONFIG_PPC_MAPLE */
206 #ifdef CONFIG_PPC_CELL
209 #ifdef CONFIG_PPC_ISERIES
216 * Early initialization entry point. This is called by head.S
217 * with MMU translation disabled. We rely on the "feature" of
218 * the CPU that ignores the top 2 bits of the address in real
219 * mode so we can access kernel globals normally provided we
220 * only toy with things in the RMO region. From here, we do
221 * some early parsing of the device-tree to setup out LMB
222 * data structures, and allocate & initialize the hash table
223 * and segment tables so we can start running with translation
226 * It is this function which will call the probe() callback of
227 * the various platform types and copy the matching one to the
228 * global ppc_md structure. Your platform can eventually do
229 * some very early initializations from the probe() routine, but
230 * this is not recommended, be very careful as, for example, the
231 * device-tree is not accessible via normal means at this point.
234 void __init
early_setup(unsigned long dt_ptr
)
236 struct paca_struct
*lpaca
= get_paca();
237 static struct machdep_calls
**mach
;
240 * Enable early debugging if any specified (see top of
245 DBG(" -> early_setup()\n");
248 * Do early initializations using the flattened device
249 * tree, like retreiving the physical memory map or
250 * calculating/retreiving the hash table size
252 early_init_devtree(__va(dt_ptr
));
255 * Iterate all ppc_md structures until we find the proper
256 * one for the current machine type
258 DBG("Probing machine type for platform %x...\n", _machine
);
260 for (mach
= machines
; *mach
; mach
++) {
261 if ((*mach
)->probe(_machine
))
264 /* What can we do if we didn't find ? */
266 DBG("No suitable machine found !\n");
271 DBG("Found, Initializing memory management...\n");
274 * Initialize the MMU Hash table and create the linear mapping
275 * of memory. Has to be done before stab/slb initialization as
276 * this is currently where the page size encoding is obtained
281 * Initialize stab / SLB management except on iSeries
283 if (!firmware_has_feature(FW_FEATURE_ISERIES
)) {
284 if (cpu_has_feature(CPU_FTR_SLB
))
287 stab_initialize(lpaca
->stab_real
);
290 DBG(" <- early_setup()\n");
294 void early_setup_secondary(void)
296 struct paca_struct
*lpaca
= get_paca();
298 /* Mark enabled in PACA */
299 lpaca
->proc_enabled
= 0;
301 /* Initialize hash table for that CPU */
302 htab_initialize_secondary();
304 /* Initialize STAB/SLB. We use a virtual address as it works
305 * in real mode on pSeries and we want a virutal address on
308 if (cpu_has_feature(CPU_FTR_SLB
))
311 stab_initialize(lpaca
->stab_addr
);
314 #endif /* CONFIG_SMP */
316 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
317 void smp_release_cpus(void)
319 extern unsigned long __secondary_hold_spinloop
;
321 DBG(" -> smp_release_cpus()\n");
323 /* All secondary cpus are spinning on a common spinloop, release them
324 * all now so they can start to spin on their individual paca
325 * spinloops. For non SMP kernels, the secondary cpus never get out
326 * of the common spinloop.
327 * This is useless but harmless on iSeries, secondaries are already
328 * waiting on their paca spinloops. */
330 __secondary_hold_spinloop
= 1;
333 DBG(" <- smp_release_cpus()\n");
336 #define smp_release_cpus()
337 #endif /* CONFIG_SMP || CONFIG_KEXEC */
340 * Initialize some remaining members of the ppc64_caches and systemcfg
342 * (at least until we get rid of them completely). This is mostly some
343 * cache informations about the CPU that will be used by cache flush
344 * routines and/or provided to userland
346 static void __init
initialize_cache_info(void)
348 struct device_node
*np
;
349 unsigned long num_cpus
= 0;
351 DBG(" -> initialize_cache_info()\n");
353 for (np
= NULL
; (np
= of_find_node_by_type(np
, "cpu"));) {
356 /* We're assuming *all* of the CPUs have the same
357 * d-cache and i-cache sizes... -Peter
360 if ( num_cpus
== 1 ) {
365 /* Then read cache informations */
366 if (_machine
== PLATFORM_POWERMAC
) {
367 dc
= "d-cache-block-size";
368 ic
= "i-cache-block-size";
370 dc
= "d-cache-line-size";
371 ic
= "i-cache-line-size";
375 lsize
= cur_cpu_spec
->dcache_bsize
;
376 sizep
= (u32
*)get_property(np
, "d-cache-size", NULL
);
379 lsizep
= (u32
*) get_property(np
, dc
, NULL
);
382 if (sizep
== 0 || lsizep
== 0)
383 DBG("Argh, can't find dcache properties ! "
384 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
386 ppc64_caches
.dsize
= size
;
387 ppc64_caches
.dline_size
= lsize
;
388 ppc64_caches
.log_dline_size
= __ilog2(lsize
);
389 ppc64_caches
.dlines_per_page
= PAGE_SIZE
/ lsize
;
392 lsize
= cur_cpu_spec
->icache_bsize
;
393 sizep
= (u32
*)get_property(np
, "i-cache-size", NULL
);
396 lsizep
= (u32
*)get_property(np
, ic
, NULL
);
399 if (sizep
== 0 || lsizep
== 0)
400 DBG("Argh, can't find icache properties ! "
401 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
403 ppc64_caches
.isize
= size
;
404 ppc64_caches
.iline_size
= lsize
;
405 ppc64_caches
.log_iline_size
= __ilog2(lsize
);
406 ppc64_caches
.ilines_per_page
= PAGE_SIZE
/ lsize
;
410 DBG(" <- initialize_cache_info()\n");
415 * Do some initial setup of the system. The parameters are those which
416 * were passed in from the bootloader.
418 void __init
setup_system(void)
420 DBG(" -> setup_system()\n");
423 * Unflatten the device-tree passed by prom_init or kexec
425 unflatten_device_tree();
428 kexec_setup(); /* requires unflattened device tree. */
432 * Fill the ppc64_caches & systemcfg structures with informations
433 * retreived from the device-tree. Need to be called before
434 * finish_device_tree() since the later requires some of the
435 * informations filled up here to properly parse the interrupt
437 * It also sets up the cache line sizes which allows to call
438 * routines like flush_icache_range (used by the hash init
441 initialize_cache_info();
443 #ifdef CONFIG_PPC_RTAS
445 * Initialize RTAS if available
448 #endif /* CONFIG_PPC_RTAS */
451 * Check if we have an initrd provided via the device-tree
456 * Do some platform specific early initializations, that includes
457 * setting up the hash table pointers. It also sets up some interrupt-mapping
458 * related options that will be used by finish_device_tree()
463 * "Finish" the device-tree, that is do the actual parsing of
464 * some of the properties like the interrupt map
466 finish_device_tree();
468 #ifdef CONFIG_BOOTX_TEXT
475 #ifdef CONFIG_XMON_DEFAULT
479 * Register early console
481 register_early_udbg_console();
483 /* Save unparsed command line copy for /proc/cmdline */
484 strlcpy(saved_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
489 smp_setup_cpu_maps();
491 /* Release secondary cpus out of their spinloops at 0x60 now that
492 * we can map physical -> logical CPU ids
496 printk("Starting Linux PPC64 %s\n", system_utsname
.version
);
498 printk("-----------------------------------------------------\n");
499 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size
);
500 printk("ppc64_interrupt_controller = 0x%ld\n",
501 ppc64_interrupt_controller
);
502 printk("platform = 0x%x\n", _machine
);
503 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
504 printk("ppc64_caches.dcache_line_size = 0x%x\n",
505 ppc64_caches
.dline_size
);
506 printk("ppc64_caches.icache_line_size = 0x%x\n",
507 ppc64_caches
.iline_size
);
508 printk("htab_address = 0x%p\n", htab_address
);
509 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask
);
510 printk("-----------------------------------------------------\n");
514 DBG(" <- setup_system()\n");
517 static int ppc64_panic_event(struct notifier_block
*this,
518 unsigned long event
, void *ptr
)
520 ppc_md
.panic((char *)ptr
); /* May not return */
524 #ifdef CONFIG_IRQSTACKS
525 static void __init
irqstack_early_init(void)
530 * interrupt stacks must be under 256MB, we cannot afford to take
531 * SLB misses on them.
534 softirq_ctx
[i
] = (struct thread_info
*)
535 __va(lmb_alloc_base(THREAD_SIZE
,
536 THREAD_SIZE
, 0x10000000));
537 hardirq_ctx
[i
] = (struct thread_info
*)
538 __va(lmb_alloc_base(THREAD_SIZE
,
539 THREAD_SIZE
, 0x10000000));
543 #define irqstack_early_init()
547 * Stack space used when we detect a bad kernel stack pointer, and
548 * early in SMP boots before relocation is enabled.
550 static void __init
emergency_stack_init(void)
556 * Emergency stacks must be under 256MB, we cannot afford to take
557 * SLB misses on them. The ABI also requires them to be 128-byte
560 * Since we use these as temporary stacks during secondary CPU
561 * bringup, we need to get at them in real mode. This means they
562 * must also be within the RMO region.
564 limit
= min(0x10000000UL
, lmb
.rmo_size
);
567 paca
[i
].emergency_sp
=
568 __va(lmb_alloc_base(HW_PAGE_SIZE
, 128, limit
)) + HW_PAGE_SIZE
;
572 * Called into from start_kernel, after lock_kernel has been called.
573 * Initializes bootmem, which is unsed to manage page allocation until
574 * mem_init is called.
576 void __init
setup_arch(char **cmdline_p
)
578 extern void do_init_bootmem(void);
580 ppc64_boot_msg(0x12, "Setup Arch");
582 *cmdline_p
= cmd_line
;
585 * Set cache line size based on type of cpu as a default.
586 * Systems with OF can look in the properties on the cpu node(s)
587 * for a possibly more accurate value.
589 dcache_bsize
= ppc64_caches
.dline_size
;
590 icache_bsize
= ppc64_caches
.iline_size
;
592 /* reboot on panic */
596 notifier_chain_register(&panic_notifier_list
, &ppc64_panic_block
);
598 init_mm
.start_code
= PAGE_OFFSET
;
599 init_mm
.end_code
= (unsigned long) _etext
;
600 init_mm
.end_data
= (unsigned long) _edata
;
601 init_mm
.brk
= klimit
;
603 irqstack_early_init();
604 emergency_stack_init();
608 /* set up the bootmem stuff with available memory */
612 #ifdef CONFIG_DUMMY_CONSOLE
613 conswitchp
= &dummy_con
;
618 /* Use the default idle loop if the platform hasn't provided one. */
619 if (NULL
== ppc_md
.idle_loop
) {
620 ppc_md
.idle_loop
= default_idle
;
621 printk(KERN_INFO
"Using default idle loop\n");
625 ppc64_boot_msg(0x15, "Setup Done");
629 /* ToDo: do something useful if ppc_md is not yet setup. */
630 #define PPC64_LINUX_FUNCTION 0x0f000000
631 #define PPC64_IPL_MESSAGE 0xc0000000
632 #define PPC64_TERM_MESSAGE 0xb0000000
634 static void ppc64_do_msg(unsigned int src
, const char *msg
)
636 if (ppc_md
.progress
) {
639 sprintf(buf
, "%08X\n", src
);
640 ppc_md
.progress(buf
, 0);
641 snprintf(buf
, 128, "%s", msg
);
642 ppc_md
.progress(buf
, 0);
646 /* Print a boot progress message. */
647 void ppc64_boot_msg(unsigned int src
, const char *msg
)
649 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_IPL_MESSAGE
|src
, msg
);
650 printk("[boot]%04x %s\n", src
, msg
);
653 /* Print a termination message (print only -- does not stop the kernel) */
654 void ppc64_terminate_msg(unsigned int src
, const char *msg
)
656 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_TERM_MESSAGE
|src
, msg
);
657 printk("[terminate]%04x %s\n", src
, msg
);
660 #ifndef CONFIG_PPC_ISERIES
662 * This function can be used by platforms to "find" legacy serial ports.
663 * It works for "serial" nodes under an "isa" node, and will try to
664 * respect the "ibm,aix-loc" property if any. It works with up to 8
668 #define MAX_LEGACY_SERIAL_PORTS 8
669 static struct plat_serial8250_port serial_ports
[MAX_LEGACY_SERIAL_PORTS
+1];
670 static unsigned int old_serial_count
;
672 void __init
generic_find_legacy_serial_ports(u64
*physport
,
673 unsigned int *default_speed
)
675 struct device_node
*np
;
678 struct isa_reg_property
{
683 struct pci_reg_property
{
684 struct pci_address addr
;
689 DBG(" -> generic_find_legacy_serial_port()\n");
695 np
= of_find_node_by_path("/");
699 /* First fill our array */
700 for (np
= NULL
; (np
= of_find_node_by_type(np
, "serial"));) {
701 struct device_node
*isa
, *pci
;
702 struct isa_reg_property
*reg
;
703 unsigned long phys_size
, addr_size
, io_base
;
705 u32
*interrupts
, *clk
, *spd
;
707 int index
, rlen
, rentsize
;
709 /* Ok, first check if it's under an "isa" parent */
710 isa
= of_get_parent(np
);
711 if (!isa
|| strcmp(isa
->name
, "isa")) {
712 DBG("%s: no isa parent found\n", np
->full_name
);
716 /* Now look for an "ibm,aix-loc" property that gives us ordering
719 typep
= (char *)get_property(np
, "ibm,aix-loc", NULL
);
721 /* Get the ISA port number */
722 reg
= (struct isa_reg_property
*)get_property(np
, "reg", NULL
);
725 /* We assume the interrupt number isn't translated ... */
726 interrupts
= (u32
*)get_property(np
, "interrupts", NULL
);
727 /* get clock freq. if present */
728 clk
= (u32
*)get_property(np
, "clock-frequency", NULL
);
729 /* get default speed if present */
730 spd
= (u32
*)get_property(np
, "current-speed", NULL
);
731 /* Default to locate at end of array */
732 index
= old_serial_count
; /* end of the array by default */
734 /* If we have a location index, then use it */
735 if (typep
&& *typep
== 'S') {
736 index
= simple_strtol(typep
+1, NULL
, 0) - 1;
737 /* if index is out of range, use end of array instead */
738 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
739 index
= old_serial_count
;
740 /* if our index is still out of range, that mean that
741 * array is full, we could scan for a free slot but that
742 * make little sense to bother, just skip the port
744 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
746 if (index
>= old_serial_count
)
747 old_serial_count
= index
+ 1;
748 /* Check if there is a port who already claimed our slot */
749 if (serial_ports
[index
].iobase
!= 0) {
750 /* if we still have some room, move it, else override */
751 if (old_serial_count
< MAX_LEGACY_SERIAL_PORTS
) {
752 DBG("Moved legacy port %d -> %d\n", index
,
754 serial_ports
[old_serial_count
++] =
757 DBG("Replacing legacy port %d\n", index
);
761 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
763 if (index
>= old_serial_count
)
764 old_serial_count
= index
+ 1;
766 /* Now fill the entry */
767 memset(&serial_ports
[index
], 0, sizeof(struct plat_serial8250_port
));
768 serial_ports
[index
].uartclk
= clk
? *clk
: BASE_BAUD
* 16;
769 serial_ports
[index
].iobase
= reg
->address
;
770 serial_ports
[index
].irq
= interrupts
? interrupts
[0] : 0;
771 serial_ports
[index
].flags
= ASYNC_BOOT_AUTOCONF
;
773 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
775 serial_ports
[index
].iobase
,
776 serial_ports
[index
].irq
,
777 serial_ports
[index
].uartclk
);
779 /* Get phys address of IO reg for port 1 */
783 pci
= of_get_parent(isa
);
785 DBG("%s: no pci parent found\n", np
->full_name
);
789 rangesp
= (u32
*)get_property(pci
, "ranges", &rlen
);
790 if (rangesp
== NULL
) {
796 /* we need the #size-cells of the PCI bridge node itself */
798 sizeprop
= (u32
*)get_property(pci
, "#size-cells", NULL
);
799 if (sizeprop
!= NULL
)
800 phys_size
= *sizeprop
;
801 /* we need the parent #addr-cells */
802 addr_size
= prom_n_addr_cells(pci
);
803 rentsize
= 3 + addr_size
+ phys_size
;
805 for (;rlen
>= rentsize
; rlen
-= rentsize
,rangesp
+= rentsize
) {
806 if (((rangesp
[0] >> 24) & 0x3) != 1)
807 continue; /* not IO space */
808 io_base
= rangesp
[3];
810 io_base
= (io_base
<< 32) | rangesp
[4];
813 *physport
= io_base
+ reg
->address
;
814 if (default_speed
&& spd
)
815 *default_speed
= *spd
;
822 DBG(" <- generic_find_legacy_serial_port()\n");
825 static struct platform_device serial_device
= {
826 .name
= "serial8250",
827 .id
= PLAT8250_DEV_PLATFORM
,
829 .platform_data
= serial_ports
,
833 static int __init
serial_dev_init(void)
835 return platform_device_register(&serial_device
);
837 arch_initcall(serial_dev_init
);
839 #endif /* CONFIG_PPC_ISERIES */
841 int check_legacy_ioport(unsigned long base_port
)
843 if (ppc_md
.check_legacy_ioport
== NULL
)
845 return ppc_md
.check_legacy_ioport(base_port
);
847 EXPORT_SYMBOL(check_legacy_ioport
);