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>
44 #include <asm/ppcdebug.h>
46 #include <asm/cputable.h>
47 #include <asm/sections.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>
59 #include <asm/iSeries/ItLpNaca.h>
60 #include <asm/firmware.h>
61 #include <asm/systemcfg.h>
65 #define DBG(fmt...) udbg_printf(fmt)
71 * Here are some early debugging facilities. You can enable one
72 * but your kernel will not boot on anything else if you do so
75 /* This one is for use on LPAR machines that support an HVC console
78 extern void udbg_init_debug_lpar(void);
79 /* This one is for use on Apple G5 machines
81 extern void udbg_init_pmac_realmode(void);
82 /* That's RTAS panel debug */
83 extern void call_rtas_display_status_delay(unsigned char c
);
84 /* Here's maple real mode debug */
85 extern void udbg_init_maple_realmode(void);
87 #define EARLY_DEBUG_INIT() do {} while(0)
90 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
91 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
92 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
93 #define EARLY_DEBUG_INIT() \
94 do { udbg_putc = call_rtas_display_status_delay; } while(0)
97 /* extern void *stab; */
98 extern unsigned long klimit
;
100 extern void mm_init_ppc64(void);
101 extern void stab_initialize(unsigned long stab
);
102 extern void htab_initialize(void);
103 extern void early_init_devtree(void *flat_dt
);
104 extern void unflatten_device_tree(void);
106 extern void smp_release_cpus(void);
110 int boot_cpuid_phys
= 0;
114 struct ppc64_caches ppc64_caches
;
115 EXPORT_SYMBOL_GPL(ppc64_caches
);
118 * These are used in binfmt_elf.c to put aux entries on the stack
119 * for each elf executable being started.
125 /* The main machine-dep calls structure
127 struct machdep_calls ppc_md
;
128 EXPORT_SYMBOL(ppc_md
);
130 #ifdef CONFIG_MAGIC_SYSRQ
131 unsigned long SYSRQ_KEY
;
132 #endif /* CONFIG_MAGIC_SYSRQ */
135 static int ppc64_panic_event(struct notifier_block
*, unsigned long, void *);
136 static struct notifier_block ppc64_panic_block
= {
137 .notifier_call
= ppc64_panic_event
,
138 .priority
= INT_MIN
/* may not return; must be done last */
143 static int smt_enabled_cmdline
;
145 /* Look for ibm,smt-enabled OF option */
146 static void check_smt_enabled(void)
148 struct device_node
*dn
;
151 /* Allow the command line to overrule the OF option */
152 if (smt_enabled_cmdline
)
155 dn
= of_find_node_by_path("/options");
158 smt_option
= (char *)get_property(dn
, "ibm,smt-enabled", NULL
);
161 if (!strcmp(smt_option
, "on"))
162 smt_enabled_at_boot
= 1;
163 else if (!strcmp(smt_option
, "off"))
164 smt_enabled_at_boot
= 0;
169 /* Look for smt-enabled= cmdline option */
170 static int __init
early_smt_enabled(char *p
)
172 smt_enabled_cmdline
= 1;
177 if (!strcmp(p
, "on") || !strcmp(p
, "1"))
178 smt_enabled_at_boot
= 1;
179 else if (!strcmp(p
, "off") || !strcmp(p
, "0"))
180 smt_enabled_at_boot
= 0;
184 early_param("smt-enabled", early_smt_enabled
);
187 * setup_cpu_maps - initialize the following cpu maps:
192 * Having the possible map set up early allows us to restrict allocations
193 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
195 * We do not initialize the online map here; cpus set their own bits in
196 * cpu_online_map as they come up.
198 * This function is valid only for Open Firmware systems. finish_device_tree
199 * must be called before using this.
201 * While we're here, we may as well set the "physical" cpu ids in the paca.
203 static void __init
setup_cpu_maps(void)
205 struct device_node
*dn
= NULL
;
211 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< NR_CPUS
) {
213 int j
, len
= sizeof(u32
), nthreads
;
215 intserv
= (u32
*)get_property(dn
, "ibm,ppc-interrupt-server#s",
218 intserv
= (u32
*)get_property(dn
, "reg", NULL
);
220 nthreads
= len
/ sizeof(u32
);
222 for (j
= 0; j
< nthreads
&& cpu
< NR_CPUS
; j
++) {
223 cpu_set(cpu
, cpu_present_map
);
224 set_hard_smp_processor_id(cpu
, intserv
[j
]);
226 if (intserv
[j
] == boot_cpuid_phys
)
228 cpu_set(cpu
, cpu_possible_map
);
233 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
234 * boot cpu is logical 0.
236 if (boot_cpuid_phys
!= get_hard_smp_processor_id(0)) {
238 tmp
= get_hard_smp_processor_id(0);
239 set_hard_smp_processor_id(0, boot_cpuid_phys
);
240 set_hard_smp_processor_id(swap_cpuid
, tmp
);
244 * On pSeries LPAR, we need to know how many cpus
245 * could possibly be added to this partition.
247 if (systemcfg
->platform
== PLATFORM_PSERIES_LPAR
&&
248 (dn
= of_find_node_by_path("/rtas"))) {
249 int num_addr_cell
, num_size_cell
, maxcpus
;
252 num_addr_cell
= prom_n_addr_cells(dn
);
253 num_size_cell
= prom_n_size_cells(dn
);
255 ireg
= (unsigned int *)
256 get_property(dn
, "ibm,lrdr-capacity", NULL
);
261 maxcpus
= ireg
[num_addr_cell
+ num_size_cell
];
263 /* Double maxcpus for processors which have SMT capability */
264 if (cpu_has_feature(CPU_FTR_SMT
))
267 if (maxcpus
> NR_CPUS
) {
269 "Partition configured for %d cpus, "
270 "operating system maximum is %d.\n",
274 printk(KERN_INFO
"Partition configured for %d cpus.\n",
277 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
278 cpu_set(cpu
, cpu_possible_map
);
284 * Do the sibling map; assume only two threads per processor.
287 cpu_set(cpu
, cpu_sibling_map
[cpu
]);
288 if (cpu_has_feature(CPU_FTR_SMT
))
289 cpu_set(cpu
^ 0x1, cpu_sibling_map
[cpu
]);
292 systemcfg
->processorCount
= num_present_cpus();
294 #endif /* CONFIG_SMP */
296 extern struct machdep_calls pSeries_md
;
297 extern struct machdep_calls pmac_md
;
298 extern struct machdep_calls maple_md
;
299 extern struct machdep_calls cell_md
;
300 extern struct machdep_calls iseries_md
;
302 /* Ultimately, stuff them in an elf section like initcalls... */
303 static struct machdep_calls __initdata
*machines
[] = {
304 #ifdef CONFIG_PPC_PSERIES
306 #endif /* CONFIG_PPC_PSERIES */
307 #ifdef CONFIG_PPC_PMAC
309 #endif /* CONFIG_PPC_PMAC */
310 #ifdef CONFIG_PPC_MAPLE
312 #endif /* CONFIG_PPC_MAPLE */
313 #ifdef CONFIG_PPC_CELL
316 #ifdef CONFIG_PPC_ISERIES
323 * Early initialization entry point. This is called by head.S
324 * with MMU translation disabled. We rely on the "feature" of
325 * the CPU that ignores the top 2 bits of the address in real
326 * mode so we can access kernel globals normally provided we
327 * only toy with things in the RMO region. From here, we do
328 * some early parsing of the device-tree to setup out LMB
329 * data structures, and allocate & initialize the hash table
330 * and segment tables so we can start running with translation
333 * It is this function which will call the probe() callback of
334 * the various platform types and copy the matching one to the
335 * global ppc_md structure. Your platform can eventually do
336 * some very early initializations from the probe() routine, but
337 * this is not recommended, be very careful as, for example, the
338 * device-tree is not accessible via normal means at this point.
341 void __init
early_setup(unsigned long dt_ptr
)
343 struct paca_struct
*lpaca
= get_paca();
344 static struct machdep_calls
**mach
;
347 * Enable early debugging if any specified (see top of
352 DBG(" -> early_setup()\n");
355 * Fill the default DBG level (do we want to keep
356 * that old mecanism around forever ?)
361 * Do early initializations using the flattened device
362 * tree, like retreiving the physical memory map or
363 * calculating/retreiving the hash table size
365 early_init_devtree(__va(dt_ptr
));
368 * Iterate all ppc_md structures until we find the proper
369 * one for the current machine type
371 DBG("Probing machine type for platform %x...\n",
372 systemcfg
->platform
);
374 for (mach
= machines
; *mach
; mach
++) {
375 if ((*mach
)->probe(systemcfg
->platform
))
378 /* What can we do if we didn't find ? */
380 DBG("No suitable machine found !\n");
385 DBG("Found, Initializing memory management...\n");
388 * Initialize stab / SLB management
390 if (!firmware_has_feature(FW_FEATURE_ISERIES
))
391 stab_initialize(lpaca
->stab_real
);
394 * Initialize the MMU Hash table and create the linear mapping
399 DBG(" <- early_setup()\n");
404 * Initialize some remaining members of the ppc64_caches and systemcfg structures
405 * (at least until we get rid of them completely). This is mostly some
406 * cache informations about the CPU that will be used by cache flush
407 * routines and/or provided to userland
409 static void __init
initialize_cache_info(void)
411 struct device_node
*np
;
412 unsigned long num_cpus
= 0;
414 DBG(" -> initialize_cache_info()\n");
416 for (np
= NULL
; (np
= of_find_node_by_type(np
, "cpu"));) {
419 /* We're assuming *all* of the CPUs have the same
420 * d-cache and i-cache sizes... -Peter
423 if ( num_cpus
== 1 ) {
428 /* Then read cache informations */
429 if (systemcfg
->platform
== PLATFORM_POWERMAC
) {
430 dc
= "d-cache-block-size";
431 ic
= "i-cache-block-size";
433 dc
= "d-cache-line-size";
434 ic
= "i-cache-line-size";
438 lsize
= cur_cpu_spec
->dcache_bsize
;
439 sizep
= (u32
*)get_property(np
, "d-cache-size", NULL
);
442 lsizep
= (u32
*) get_property(np
, dc
, NULL
);
445 if (sizep
== 0 || lsizep
== 0)
446 DBG("Argh, can't find dcache properties ! "
447 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
449 systemcfg
->dcache_size
= ppc64_caches
.dsize
= size
;
450 systemcfg
->dcache_line_size
=
451 ppc64_caches
.dline_size
= lsize
;
452 ppc64_caches
.log_dline_size
= __ilog2(lsize
);
453 ppc64_caches
.dlines_per_page
= PAGE_SIZE
/ lsize
;
456 lsize
= cur_cpu_spec
->icache_bsize
;
457 sizep
= (u32
*)get_property(np
, "i-cache-size", NULL
);
460 lsizep
= (u32
*)get_property(np
, ic
, NULL
);
463 if (sizep
== 0 || lsizep
== 0)
464 DBG("Argh, can't find icache properties ! "
465 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
467 systemcfg
->icache_size
= ppc64_caches
.isize
= size
;
468 systemcfg
->icache_line_size
=
469 ppc64_caches
.iline_size
= lsize
;
470 ppc64_caches
.log_iline_size
= __ilog2(lsize
);
471 ppc64_caches
.ilines_per_page
= PAGE_SIZE
/ lsize
;
475 /* Add an eye catcher and the systemcfg layout version number */
476 strcpy(systemcfg
->eye_catcher
, "SYSTEMCFG:PPC64");
477 systemcfg
->version
.major
= SYSTEMCFG_MAJOR
;
478 systemcfg
->version
.minor
= SYSTEMCFG_MINOR
;
479 systemcfg
->processor
= mfspr(SPRN_PVR
);
481 DBG(" <- initialize_cache_info()\n");
484 static void __init
check_for_initrd(void)
486 #ifdef CONFIG_BLK_DEV_INITRD
489 DBG(" -> check_for_initrd()\n");
492 prop
= (u64
*)get_property(of_chosen
,
493 "linux,initrd-start", NULL
);
495 initrd_start
= (unsigned long)__va(*prop
);
496 prop
= (u64
*)get_property(of_chosen
,
497 "linux,initrd-end", NULL
);
499 initrd_end
= (unsigned long)__va(*prop
);
500 initrd_below_start_ok
= 1;
506 /* If we were passed an initrd, set the ROOT_DEV properly if the values
507 * look sensible. If not, clear initrd reference.
509 if (initrd_start
>= KERNELBASE
&& initrd_end
>= KERNELBASE
&&
510 initrd_end
> initrd_start
)
511 ROOT_DEV
= Root_RAM0
;
513 initrd_start
= initrd_end
= 0;
516 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
518 DBG(" <- check_for_initrd()\n");
519 #endif /* CONFIG_BLK_DEV_INITRD */
523 * Do some initial setup of the system. The parameters are those which
524 * were passed in from the bootloader.
526 void __init
setup_system(void)
528 DBG(" -> setup_system()\n");
531 * Unflatten the device-tree passed by prom_init or kexec
533 unflatten_device_tree();
536 * Fill the ppc64_caches & systemcfg structures with informations
537 * retreived from the device-tree. Need to be called before
538 * finish_device_tree() since the later requires some of the
539 * informations filled up here to properly parse the interrupt
541 * It also sets up the cache line sizes which allows to call
542 * routines like flush_icache_range (used by the hash init
545 initialize_cache_info();
547 #ifdef CONFIG_PPC_RTAS
549 * Initialize RTAS if available
552 #endif /* CONFIG_PPC_RTAS */
555 * Check if we have an initrd provided via the device-tree
560 * Do some platform specific early initializations, that includes
561 * setting up the hash table pointers. It also sets up some interrupt-mapping
562 * related options that will be used by finish_device_tree()
567 * "Finish" the device-tree, that is do the actual parsing of
568 * some of the properties like the interrupt map
570 finish_device_tree();
572 #ifdef CONFIG_BOOTX_TEXT
579 #ifdef CONFIG_XMON_DEFAULT
583 * Register early console
585 register_early_udbg_console();
587 /* Save unparsed command line copy for /proc/cmdline */
588 strlcpy(saved_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
594 * iSeries has already initialized the cpu maps at this point.
598 /* Release secondary cpus out of their spinloops at 0x60 now that
599 * we can map physical -> logical CPU ids
604 printk("Starting Linux PPC64 %s\n", system_utsname
.version
);
606 printk("-----------------------------------------------------\n");
607 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size
);
608 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch
);
609 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller
);
610 printk("systemcfg = 0x%p\n", systemcfg
);
611 printk("systemcfg->platform = 0x%x\n", systemcfg
->platform
);
612 printk("systemcfg->processorCount = 0x%lx\n", systemcfg
->processorCount
);
613 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg
->physicalMemorySize
);
614 printk("ppc64_caches.dcache_line_size = 0x%x\n",
615 ppc64_caches
.dline_size
);
616 printk("ppc64_caches.icache_line_size = 0x%x\n",
617 ppc64_caches
.iline_size
);
618 printk("htab_address = 0x%p\n", htab_address
);
619 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask
);
620 printk("-----------------------------------------------------\n");
624 DBG(" <- setup_system()\n");
627 static int ppc64_panic_event(struct notifier_block
*this,
628 unsigned long event
, void *ptr
)
630 ppc_md
.panic((char *)ptr
); /* May not return */
634 #ifdef CONFIG_IRQSTACKS
635 static void __init
irqstack_early_init(void)
640 * interrupt stacks must be under 256MB, we cannot afford to take
641 * SLB misses on them.
644 softirq_ctx
[i
] = (struct thread_info
*)__va(lmb_alloc_base(THREAD_SIZE
,
645 THREAD_SIZE
, 0x10000000));
646 hardirq_ctx
[i
] = (struct thread_info
*)__va(lmb_alloc_base(THREAD_SIZE
,
647 THREAD_SIZE
, 0x10000000));
651 #define irqstack_early_init()
655 * Stack space used when we detect a bad kernel stack pointer, and
656 * early in SMP boots before relocation is enabled.
658 static void __init
emergency_stack_init(void)
664 * Emergency stacks must be under 256MB, we cannot afford to take
665 * SLB misses on them. The ABI also requires them to be 128-byte
668 * Since we use these as temporary stacks during secondary CPU
669 * bringup, we need to get at them in real mode. This means they
670 * must also be within the RMO region.
672 limit
= min(0x10000000UL
, lmb
.rmo_size
);
675 paca
[i
].emergency_sp
= __va(lmb_alloc_base(PAGE_SIZE
, 128,
680 * Called from setup_arch to initialize the bitmap of available
681 * syscalls in the systemcfg page
683 void __init
setup_syscall_map(void)
685 unsigned int i
, count64
= 0, count32
= 0;
686 extern unsigned long *sys_call_table
;
687 extern unsigned long sys_ni_syscall
;
690 for (i
= 0; i
< __NR_syscalls
; i
++) {
691 if (sys_call_table
[i
*2] != sys_ni_syscall
) {
693 systemcfg
->syscall_map_64
[i
>> 5] |=
694 0x80000000UL
>> (i
& 0x1f);
696 if (sys_call_table
[i
*2+1] != sys_ni_syscall
) {
698 systemcfg
->syscall_map_32
[i
>> 5] |=
699 0x80000000UL
>> (i
& 0x1f);
702 printk(KERN_INFO
"Syscall map setup, %d 32-bit and %d 64-bit syscalls\n",
707 * Called into from start_kernel, after lock_kernel has been called.
708 * Initializes bootmem, which is unsed to manage page allocation until
709 * mem_init is called.
711 void __init
setup_arch(char **cmdline_p
)
713 extern void do_init_bootmem(void);
715 ppc64_boot_msg(0x12, "Setup Arch");
717 *cmdline_p
= cmd_line
;
720 * Set cache line size based on type of cpu as a default.
721 * Systems with OF can look in the properties on the cpu node(s)
722 * for a possibly more accurate value.
724 dcache_bsize
= ppc64_caches
.dline_size
;
725 icache_bsize
= ppc64_caches
.iline_size
;
727 /* reboot on panic */
731 notifier_chain_register(&panic_notifier_list
, &ppc64_panic_block
);
733 init_mm
.start_code
= PAGE_OFFSET
;
734 init_mm
.end_code
= (unsigned long) _etext
;
735 init_mm
.end_data
= (unsigned long) _edata
;
736 init_mm
.brk
= klimit
;
738 irqstack_early_init();
739 emergency_stack_init();
743 /* set up the bootmem stuff with available memory */
747 /* initialize the syscall map in systemcfg */
750 #ifdef CONFIG_DUMMY_CONSOLE
751 conswitchp
= &dummy_con
;
756 /* Use the default idle loop if the platform hasn't provided one. */
757 if (NULL
== ppc_md
.idle_loop
) {
758 ppc_md
.idle_loop
= default_idle
;
759 printk(KERN_INFO
"Using default idle loop\n");
763 ppc64_boot_msg(0x15, "Setup Done");
767 /* ToDo: do something useful if ppc_md is not yet setup. */
768 #define PPC64_LINUX_FUNCTION 0x0f000000
769 #define PPC64_IPL_MESSAGE 0xc0000000
770 #define PPC64_TERM_MESSAGE 0xb0000000
772 static void ppc64_do_msg(unsigned int src
, const char *msg
)
774 if (ppc_md
.progress
) {
777 sprintf(buf
, "%08X\n", src
);
778 ppc_md
.progress(buf
, 0);
779 snprintf(buf
, 128, "%s", msg
);
780 ppc_md
.progress(buf
, 0);
784 /* Print a boot progress message. */
785 void ppc64_boot_msg(unsigned int src
, const char *msg
)
787 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_IPL_MESSAGE
|src
, msg
);
788 printk("[boot]%04x %s\n", src
, msg
);
791 /* Print a termination message (print only -- does not stop the kernel) */
792 void ppc64_terminate_msg(unsigned int src
, const char *msg
)
794 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_TERM_MESSAGE
|src
, msg
);
795 printk("[terminate]%04x %s\n", src
, msg
);
798 #ifndef CONFIG_PPC_ISERIES
800 * This function can be used by platforms to "find" legacy serial ports.
801 * It works for "serial" nodes under an "isa" node, and will try to
802 * respect the "ibm,aix-loc" property if any. It works with up to 8
806 #define MAX_LEGACY_SERIAL_PORTS 8
807 static struct plat_serial8250_port serial_ports
[MAX_LEGACY_SERIAL_PORTS
+1];
808 static unsigned int old_serial_count
;
810 void __init
generic_find_legacy_serial_ports(u64
*physport
,
811 unsigned int *default_speed
)
813 struct device_node
*np
;
816 struct isa_reg_property
{
821 struct pci_reg_property
{
822 struct pci_address addr
;
827 DBG(" -> generic_find_legacy_serial_port()\n");
833 np
= of_find_node_by_path("/");
837 /* First fill our array */
838 for (np
= NULL
; (np
= of_find_node_by_type(np
, "serial"));) {
839 struct device_node
*isa
, *pci
;
840 struct isa_reg_property
*reg
;
841 unsigned long phys_size
, addr_size
, io_base
;
843 u32
*interrupts
, *clk
, *spd
;
845 int index
, rlen
, rentsize
;
847 /* Ok, first check if it's under an "isa" parent */
848 isa
= of_get_parent(np
);
849 if (!isa
|| strcmp(isa
->name
, "isa")) {
850 DBG("%s: no isa parent found\n", np
->full_name
);
854 /* Now look for an "ibm,aix-loc" property that gives us ordering
857 typep
= (char *)get_property(np
, "ibm,aix-loc", NULL
);
859 /* Get the ISA port number */
860 reg
= (struct isa_reg_property
*)get_property(np
, "reg", NULL
);
863 /* We assume the interrupt number isn't translated ... */
864 interrupts
= (u32
*)get_property(np
, "interrupts", NULL
);
865 /* get clock freq. if present */
866 clk
= (u32
*)get_property(np
, "clock-frequency", NULL
);
867 /* get default speed if present */
868 spd
= (u32
*)get_property(np
, "current-speed", NULL
);
869 /* Default to locate at end of array */
870 index
= old_serial_count
; /* end of the array by default */
872 /* If we have a location index, then use it */
873 if (typep
&& *typep
== 'S') {
874 index
= simple_strtol(typep
+1, NULL
, 0) - 1;
875 /* if index is out of range, use end of array instead */
876 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
877 index
= old_serial_count
;
878 /* if our index is still out of range, that mean that
879 * array is full, we could scan for a free slot but that
880 * make little sense to bother, just skip the port
882 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
884 if (index
>= old_serial_count
)
885 old_serial_count
= index
+ 1;
886 /* Check if there is a port who already claimed our slot */
887 if (serial_ports
[index
].iobase
!= 0) {
888 /* if we still have some room, move it, else override */
889 if (old_serial_count
< MAX_LEGACY_SERIAL_PORTS
) {
890 DBG("Moved legacy port %d -> %d\n", index
,
892 serial_ports
[old_serial_count
++] =
895 DBG("Replacing legacy port %d\n", index
);
899 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
901 if (index
>= old_serial_count
)
902 old_serial_count
= index
+ 1;
904 /* Now fill the entry */
905 memset(&serial_ports
[index
], 0, sizeof(struct plat_serial8250_port
));
906 serial_ports
[index
].uartclk
= clk
? *clk
: BASE_BAUD
* 16;
907 serial_ports
[index
].iobase
= reg
->address
;
908 serial_ports
[index
].irq
= interrupts
? interrupts
[0] : 0;
909 serial_ports
[index
].flags
= ASYNC_BOOT_AUTOCONF
;
911 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
913 serial_ports
[index
].iobase
,
914 serial_ports
[index
].irq
,
915 serial_ports
[index
].uartclk
);
917 /* Get phys address of IO reg for port 1 */
921 pci
= of_get_parent(isa
);
923 DBG("%s: no pci parent found\n", np
->full_name
);
927 rangesp
= (u32
*)get_property(pci
, "ranges", &rlen
);
928 if (rangesp
== NULL
) {
934 /* we need the #size-cells of the PCI bridge node itself */
936 sizeprop
= (u32
*)get_property(pci
, "#size-cells", NULL
);
937 if (sizeprop
!= NULL
)
938 phys_size
= *sizeprop
;
939 /* we need the parent #addr-cells */
940 addr_size
= prom_n_addr_cells(pci
);
941 rentsize
= 3 + addr_size
+ phys_size
;
943 for (;rlen
>= rentsize
; rlen
-= rentsize
,rangesp
+= rentsize
) {
944 if (((rangesp
[0] >> 24) & 0x3) != 1)
945 continue; /* not IO space */
946 io_base
= rangesp
[3];
948 io_base
= (io_base
<< 32) | rangesp
[4];
951 *physport
= io_base
+ reg
->address
;
952 if (default_speed
&& spd
)
953 *default_speed
= *spd
;
960 DBG(" <- generic_find_legacy_serial_port()\n");
963 static struct platform_device serial_device
= {
964 .name
= "serial8250",
965 .id
= PLAT8250_DEV_PLATFORM
,
967 .platform_data
= serial_ports
,
971 static int __init
serial_dev_init(void)
973 return platform_device_register(&serial_device
);
975 arch_initcall(serial_dev_init
);
977 #endif /* CONFIG_PPC_ISERIES */
979 int check_legacy_ioport(unsigned long base_port
)
981 if (ppc_md
.check_legacy_ioport
== NULL
)
983 return ppc_md
.check_legacy_ioport(base_port
);
985 EXPORT_SYMBOL(check_legacy_ioport
);
988 static int __init
early_xmon(char *p
)
990 /* ensure xmon is enabled */
992 if (strncmp(p
, "on", 2) == 0)
994 if (strncmp(p
, "off", 3) == 0)
996 if (strncmp(p
, "early", 5) != 0)
1004 early_param("xmon", early_xmon
);