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/it_lp_naca.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);
108 int boot_cpuid_phys
= 0;
112 struct ppc64_caches ppc64_caches
;
113 EXPORT_SYMBOL_GPL(ppc64_caches
);
116 * These are used in binfmt_elf.c to put aux entries on the stack
117 * for each elf executable being started.
123 /* The main machine-dep calls structure
125 struct machdep_calls ppc_md
;
126 EXPORT_SYMBOL(ppc_md
);
128 #ifdef CONFIG_MAGIC_SYSRQ
129 unsigned long SYSRQ_KEY
;
130 #endif /* CONFIG_MAGIC_SYSRQ */
133 static int ppc64_panic_event(struct notifier_block
*, unsigned long, void *);
134 static struct notifier_block ppc64_panic_block
= {
135 .notifier_call
= ppc64_panic_event
,
136 .priority
= INT_MIN
/* may not return; must be done last */
141 static int smt_enabled_cmdline
;
143 /* Look for ibm,smt-enabled OF option */
144 static void check_smt_enabled(void)
146 struct device_node
*dn
;
149 /* Allow the command line to overrule the OF option */
150 if (smt_enabled_cmdline
)
153 dn
= of_find_node_by_path("/options");
156 smt_option
= (char *)get_property(dn
, "ibm,smt-enabled", NULL
);
159 if (!strcmp(smt_option
, "on"))
160 smt_enabled_at_boot
= 1;
161 else if (!strcmp(smt_option
, "off"))
162 smt_enabled_at_boot
= 0;
167 /* Look for smt-enabled= cmdline option */
168 static int __init
early_smt_enabled(char *p
)
170 smt_enabled_cmdline
= 1;
175 if (!strcmp(p
, "on") || !strcmp(p
, "1"))
176 smt_enabled_at_boot
= 1;
177 else if (!strcmp(p
, "off") || !strcmp(p
, "0"))
178 smt_enabled_at_boot
= 0;
182 early_param("smt-enabled", early_smt_enabled
);
185 * setup_cpu_maps - initialize the following cpu maps:
190 * Having the possible map set up early allows us to restrict allocations
191 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
193 * We do not initialize the online map here; cpus set their own bits in
194 * cpu_online_map as they come up.
196 * This function is valid only for Open Firmware systems. finish_device_tree
197 * must be called before using this.
199 * While we're here, we may as well set the "physical" cpu ids in the paca.
201 static void __init
setup_cpu_maps(void)
203 struct device_node
*dn
= NULL
;
209 while ((dn
= of_find_node_by_type(dn
, "cpu")) && cpu
< NR_CPUS
) {
211 int j
, len
= sizeof(u32
), nthreads
;
213 intserv
= (u32
*)get_property(dn
, "ibm,ppc-interrupt-server#s",
216 intserv
= (u32
*)get_property(dn
, "reg", NULL
);
218 nthreads
= len
/ sizeof(u32
);
220 for (j
= 0; j
< nthreads
&& cpu
< NR_CPUS
; j
++) {
221 cpu_set(cpu
, cpu_present_map
);
222 set_hard_smp_processor_id(cpu
, intserv
[j
]);
224 if (intserv
[j
] == boot_cpuid_phys
)
226 cpu_set(cpu
, cpu_possible_map
);
231 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
232 * boot cpu is logical 0.
234 if (boot_cpuid_phys
!= get_hard_smp_processor_id(0)) {
236 tmp
= get_hard_smp_processor_id(0);
237 set_hard_smp_processor_id(0, boot_cpuid_phys
);
238 set_hard_smp_processor_id(swap_cpuid
, tmp
);
242 * On pSeries LPAR, we need to know how many cpus
243 * could possibly be added to this partition.
245 if (systemcfg
->platform
== PLATFORM_PSERIES_LPAR
&&
246 (dn
= of_find_node_by_path("/rtas"))) {
247 int num_addr_cell
, num_size_cell
, maxcpus
;
250 num_addr_cell
= prom_n_addr_cells(dn
);
251 num_size_cell
= prom_n_size_cells(dn
);
253 ireg
= (unsigned int *)
254 get_property(dn
, "ibm,lrdr-capacity", NULL
);
259 maxcpus
= ireg
[num_addr_cell
+ num_size_cell
];
261 /* Double maxcpus for processors which have SMT capability */
262 if (cpu_has_feature(CPU_FTR_SMT
))
265 if (maxcpus
> NR_CPUS
) {
267 "Partition configured for %d cpus, "
268 "operating system maximum is %d.\n",
272 printk(KERN_INFO
"Partition configured for %d cpus.\n",
275 for (cpu
= 0; cpu
< maxcpus
; cpu
++)
276 cpu_set(cpu
, cpu_possible_map
);
282 * Do the sibling map; assume only two threads per processor.
285 cpu_set(cpu
, cpu_sibling_map
[cpu
]);
286 if (cpu_has_feature(CPU_FTR_SMT
))
287 cpu_set(cpu
^ 0x1, cpu_sibling_map
[cpu
]);
290 systemcfg
->processorCount
= num_present_cpus();
292 #endif /* CONFIG_SMP */
294 extern struct machdep_calls pSeries_md
;
295 extern struct machdep_calls pmac_md
;
296 extern struct machdep_calls maple_md
;
297 extern struct machdep_calls cell_md
;
298 extern struct machdep_calls iseries_md
;
300 /* Ultimately, stuff them in an elf section like initcalls... */
301 static struct machdep_calls __initdata
*machines
[] = {
302 #ifdef CONFIG_PPC_PSERIES
304 #endif /* CONFIG_PPC_PSERIES */
305 #ifdef CONFIG_PPC_PMAC
307 #endif /* CONFIG_PPC_PMAC */
308 #ifdef CONFIG_PPC_MAPLE
310 #endif /* CONFIG_PPC_MAPLE */
311 #ifdef CONFIG_PPC_CELL
314 #ifdef CONFIG_PPC_ISERIES
321 * Early initialization entry point. This is called by head.S
322 * with MMU translation disabled. We rely on the "feature" of
323 * the CPU that ignores the top 2 bits of the address in real
324 * mode so we can access kernel globals normally provided we
325 * only toy with things in the RMO region. From here, we do
326 * some early parsing of the device-tree to setup out LMB
327 * data structures, and allocate & initialize the hash table
328 * and segment tables so we can start running with translation
331 * It is this function which will call the probe() callback of
332 * the various platform types and copy the matching one to the
333 * global ppc_md structure. Your platform can eventually do
334 * some very early initializations from the probe() routine, but
335 * this is not recommended, be very careful as, for example, the
336 * device-tree is not accessible via normal means at this point.
339 void __init
early_setup(unsigned long dt_ptr
)
341 struct paca_struct
*lpaca
= get_paca();
342 static struct machdep_calls
**mach
;
345 * Enable early debugging if any specified (see top of
350 DBG(" -> early_setup()\n");
353 * Fill the default DBG level (do we want to keep
354 * that old mecanism around forever ?)
359 * Do early initializations using the flattened device
360 * tree, like retreiving the physical memory map or
361 * calculating/retreiving the hash table size
363 early_init_devtree(__va(dt_ptr
));
366 * Iterate all ppc_md structures until we find the proper
367 * one for the current machine type
369 DBG("Probing machine type for platform %x...\n",
370 systemcfg
->platform
);
372 for (mach
= machines
; *mach
; mach
++) {
373 if ((*mach
)->probe(systemcfg
->platform
))
376 /* What can we do if we didn't find ? */
378 DBG("No suitable machine found !\n");
383 DBG("Found, Initializing memory management...\n");
386 * Initialize stab / SLB management
388 if (!firmware_has_feature(FW_FEATURE_ISERIES
))
389 stab_initialize(lpaca
->stab_real
);
392 * Initialize the MMU Hash table and create the linear mapping
397 DBG(" <- early_setup()\n");
401 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
402 void smp_release_cpus(void)
404 extern unsigned long __secondary_hold_spinloop
;
406 DBG(" -> smp_release_cpus()\n");
408 /* All secondary cpus are spinning on a common spinloop, release them
409 * all now so they can start to spin on their individual paca
410 * spinloops. For non SMP kernels, the secondary cpus never get out
411 * of the common spinloop.
412 * This is useless but harmless on iSeries, secondaries are already
413 * waiting on their paca spinloops. */
415 __secondary_hold_spinloop
= 1;
418 DBG(" <- smp_release_cpus()\n");
420 #endif /* CONFIG_SMP || CONFIG_KEXEC */
423 * Initialize some remaining members of the ppc64_caches and systemcfg structures
424 * (at least until we get rid of them completely). This is mostly some
425 * cache informations about the CPU that will be used by cache flush
426 * routines and/or provided to userland
428 static void __init
initialize_cache_info(void)
430 struct device_node
*np
;
431 unsigned long num_cpus
= 0;
433 DBG(" -> initialize_cache_info()\n");
435 for (np
= NULL
; (np
= of_find_node_by_type(np
, "cpu"));) {
438 /* We're assuming *all* of the CPUs have the same
439 * d-cache and i-cache sizes... -Peter
442 if ( num_cpus
== 1 ) {
447 /* Then read cache informations */
448 if (systemcfg
->platform
== PLATFORM_POWERMAC
) {
449 dc
= "d-cache-block-size";
450 ic
= "i-cache-block-size";
452 dc
= "d-cache-line-size";
453 ic
= "i-cache-line-size";
457 lsize
= cur_cpu_spec
->dcache_bsize
;
458 sizep
= (u32
*)get_property(np
, "d-cache-size", NULL
);
461 lsizep
= (u32
*) get_property(np
, dc
, NULL
);
464 if (sizep
== 0 || lsizep
== 0)
465 DBG("Argh, can't find dcache properties ! "
466 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
468 systemcfg
->dcache_size
= ppc64_caches
.dsize
= size
;
469 systemcfg
->dcache_line_size
=
470 ppc64_caches
.dline_size
= lsize
;
471 ppc64_caches
.log_dline_size
= __ilog2(lsize
);
472 ppc64_caches
.dlines_per_page
= PAGE_SIZE
/ lsize
;
475 lsize
= cur_cpu_spec
->icache_bsize
;
476 sizep
= (u32
*)get_property(np
, "i-cache-size", NULL
);
479 lsizep
= (u32
*)get_property(np
, ic
, NULL
);
482 if (sizep
== 0 || lsizep
== 0)
483 DBG("Argh, can't find icache properties ! "
484 "sizep: %p, lsizep: %p\n", sizep
, lsizep
);
486 systemcfg
->icache_size
= ppc64_caches
.isize
= size
;
487 systemcfg
->icache_line_size
=
488 ppc64_caches
.iline_size
= lsize
;
489 ppc64_caches
.log_iline_size
= __ilog2(lsize
);
490 ppc64_caches
.ilines_per_page
= PAGE_SIZE
/ lsize
;
494 /* Add an eye catcher and the systemcfg layout version number */
495 strcpy(systemcfg
->eye_catcher
, "SYSTEMCFG:PPC64");
496 systemcfg
->version
.major
= SYSTEMCFG_MAJOR
;
497 systemcfg
->version
.minor
= SYSTEMCFG_MINOR
;
498 systemcfg
->processor
= mfspr(SPRN_PVR
);
500 DBG(" <- initialize_cache_info()\n");
503 static void __init
check_for_initrd(void)
505 #ifdef CONFIG_BLK_DEV_INITRD
508 DBG(" -> check_for_initrd()\n");
511 prop
= (u64
*)get_property(of_chosen
,
512 "linux,initrd-start", NULL
);
514 initrd_start
= (unsigned long)__va(*prop
);
515 prop
= (u64
*)get_property(of_chosen
,
516 "linux,initrd-end", NULL
);
518 initrd_end
= (unsigned long)__va(*prop
);
519 initrd_below_start_ok
= 1;
525 /* If we were passed an initrd, set the ROOT_DEV properly if the values
526 * look sensible. If not, clear initrd reference.
528 if (initrd_start
>= KERNELBASE
&& initrd_end
>= KERNELBASE
&&
529 initrd_end
> initrd_start
)
530 ROOT_DEV
= Root_RAM0
;
532 initrd_start
= initrd_end
= 0;
535 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start
, initrd_end
);
537 DBG(" <- check_for_initrd()\n");
538 #endif /* CONFIG_BLK_DEV_INITRD */
542 * Do some initial setup of the system. The parameters are those which
543 * were passed in from the bootloader.
545 void __init
setup_system(void)
547 DBG(" -> setup_system()\n");
550 * Unflatten the device-tree passed by prom_init or kexec
552 unflatten_device_tree();
555 * Fill the ppc64_caches & systemcfg structures with informations
556 * retreived from the device-tree. Need to be called before
557 * finish_device_tree() since the later requires some of the
558 * informations filled up here to properly parse the interrupt
560 * It also sets up the cache line sizes which allows to call
561 * routines like flush_icache_range (used by the hash init
564 initialize_cache_info();
566 #ifdef CONFIG_PPC_RTAS
568 * Initialize RTAS if available
571 #endif /* CONFIG_PPC_RTAS */
574 * Check if we have an initrd provided via the device-tree
579 * Do some platform specific early initializations, that includes
580 * setting up the hash table pointers. It also sets up some interrupt-mapping
581 * related options that will be used by finish_device_tree()
586 * "Finish" the device-tree, that is do the actual parsing of
587 * some of the properties like the interrupt map
589 finish_device_tree();
591 #ifdef CONFIG_BOOTX_TEXT
598 #ifdef CONFIG_XMON_DEFAULT
602 * Register early console
604 register_early_udbg_console();
606 /* Save unparsed command line copy for /proc/cmdline */
607 strlcpy(saved_command_line
, cmd_line
, COMMAND_LINE_SIZE
);
613 * iSeries has already initialized the cpu maps at this point.
617 /* Release secondary cpus out of their spinloops at 0x60 now that
618 * we can map physical -> logical CPU ids
623 printk("Starting Linux PPC64 %s\n", system_utsname
.version
);
625 printk("-----------------------------------------------------\n");
626 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size
);
627 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch
);
628 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller
);
629 printk("systemcfg = 0x%p\n", systemcfg
);
630 printk("systemcfg->platform = 0x%x\n", systemcfg
->platform
);
631 printk("systemcfg->processorCount = 0x%lx\n", systemcfg
->processorCount
);
632 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg
->physicalMemorySize
);
633 printk("ppc64_caches.dcache_line_size = 0x%x\n",
634 ppc64_caches
.dline_size
);
635 printk("ppc64_caches.icache_line_size = 0x%x\n",
636 ppc64_caches
.iline_size
);
637 printk("htab_address = 0x%p\n", htab_address
);
638 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask
);
639 printk("-----------------------------------------------------\n");
643 DBG(" <- setup_system()\n");
646 static int ppc64_panic_event(struct notifier_block
*this,
647 unsigned long event
, void *ptr
)
649 ppc_md
.panic((char *)ptr
); /* May not return */
653 #ifdef CONFIG_IRQSTACKS
654 static void __init
irqstack_early_init(void)
659 * interrupt stacks must be under 256MB, we cannot afford to take
660 * SLB misses on them.
663 softirq_ctx
[i
] = (struct thread_info
*)__va(lmb_alloc_base(THREAD_SIZE
,
664 THREAD_SIZE
, 0x10000000));
665 hardirq_ctx
[i
] = (struct thread_info
*)__va(lmb_alloc_base(THREAD_SIZE
,
666 THREAD_SIZE
, 0x10000000));
670 #define irqstack_early_init()
674 * Stack space used when we detect a bad kernel stack pointer, and
675 * early in SMP boots before relocation is enabled.
677 static void __init
emergency_stack_init(void)
683 * Emergency stacks must be under 256MB, we cannot afford to take
684 * SLB misses on them. The ABI also requires them to be 128-byte
687 * Since we use these as temporary stacks during secondary CPU
688 * bringup, we need to get at them in real mode. This means they
689 * must also be within the RMO region.
691 limit
= min(0x10000000UL
, lmb
.rmo_size
);
694 paca
[i
].emergency_sp
= __va(lmb_alloc_base(PAGE_SIZE
, 128,
699 * Called from setup_arch to initialize the bitmap of available
700 * syscalls in the systemcfg page
702 void __init
setup_syscall_map(void)
704 unsigned int i
, count64
= 0, count32
= 0;
705 extern unsigned long *sys_call_table
;
706 extern unsigned long sys_ni_syscall
;
709 for (i
= 0; i
< __NR_syscalls
; i
++) {
710 if (sys_call_table
[i
*2] != sys_ni_syscall
) {
712 systemcfg
->syscall_map_64
[i
>> 5] |=
713 0x80000000UL
>> (i
& 0x1f);
715 if (sys_call_table
[i
*2+1] != sys_ni_syscall
) {
717 systemcfg
->syscall_map_32
[i
>> 5] |=
718 0x80000000UL
>> (i
& 0x1f);
721 printk(KERN_INFO
"Syscall map setup, %d 32-bit and %d 64-bit syscalls\n",
726 * Called into from start_kernel, after lock_kernel has been called.
727 * Initializes bootmem, which is unsed to manage page allocation until
728 * mem_init is called.
730 void __init
setup_arch(char **cmdline_p
)
732 extern void do_init_bootmem(void);
734 ppc64_boot_msg(0x12, "Setup Arch");
736 *cmdline_p
= cmd_line
;
739 * Set cache line size based on type of cpu as a default.
740 * Systems with OF can look in the properties on the cpu node(s)
741 * for a possibly more accurate value.
743 dcache_bsize
= ppc64_caches
.dline_size
;
744 icache_bsize
= ppc64_caches
.iline_size
;
746 /* reboot on panic */
750 notifier_chain_register(&panic_notifier_list
, &ppc64_panic_block
);
752 init_mm
.start_code
= PAGE_OFFSET
;
753 init_mm
.end_code
= (unsigned long) _etext
;
754 init_mm
.end_data
= (unsigned long) _edata
;
755 init_mm
.brk
= klimit
;
757 irqstack_early_init();
758 emergency_stack_init();
762 /* set up the bootmem stuff with available memory */
766 /* initialize the syscall map in systemcfg */
769 #ifdef CONFIG_DUMMY_CONSOLE
770 conswitchp
= &dummy_con
;
775 /* Use the default idle loop if the platform hasn't provided one. */
776 if (NULL
== ppc_md
.idle_loop
) {
777 ppc_md
.idle_loop
= default_idle
;
778 printk(KERN_INFO
"Using default idle loop\n");
782 ppc64_boot_msg(0x15, "Setup Done");
786 /* ToDo: do something useful if ppc_md is not yet setup. */
787 #define PPC64_LINUX_FUNCTION 0x0f000000
788 #define PPC64_IPL_MESSAGE 0xc0000000
789 #define PPC64_TERM_MESSAGE 0xb0000000
791 static void ppc64_do_msg(unsigned int src
, const char *msg
)
793 if (ppc_md
.progress
) {
796 sprintf(buf
, "%08X\n", src
);
797 ppc_md
.progress(buf
, 0);
798 snprintf(buf
, 128, "%s", msg
);
799 ppc_md
.progress(buf
, 0);
803 /* Print a boot progress message. */
804 void ppc64_boot_msg(unsigned int src
, const char *msg
)
806 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_IPL_MESSAGE
|src
, msg
);
807 printk("[boot]%04x %s\n", src
, msg
);
810 /* Print a termination message (print only -- does not stop the kernel) */
811 void ppc64_terminate_msg(unsigned int src
, const char *msg
)
813 ppc64_do_msg(PPC64_LINUX_FUNCTION
|PPC64_TERM_MESSAGE
|src
, msg
);
814 printk("[terminate]%04x %s\n", src
, msg
);
817 #ifndef CONFIG_PPC_ISERIES
819 * This function can be used by platforms to "find" legacy serial ports.
820 * It works for "serial" nodes under an "isa" node, and will try to
821 * respect the "ibm,aix-loc" property if any. It works with up to 8
825 #define MAX_LEGACY_SERIAL_PORTS 8
826 static struct plat_serial8250_port serial_ports
[MAX_LEGACY_SERIAL_PORTS
+1];
827 static unsigned int old_serial_count
;
829 void __init
generic_find_legacy_serial_ports(u64
*physport
,
830 unsigned int *default_speed
)
832 struct device_node
*np
;
835 struct isa_reg_property
{
840 struct pci_reg_property
{
841 struct pci_address addr
;
846 DBG(" -> generic_find_legacy_serial_port()\n");
852 np
= of_find_node_by_path("/");
856 /* First fill our array */
857 for (np
= NULL
; (np
= of_find_node_by_type(np
, "serial"));) {
858 struct device_node
*isa
, *pci
;
859 struct isa_reg_property
*reg
;
860 unsigned long phys_size
, addr_size
, io_base
;
862 u32
*interrupts
, *clk
, *spd
;
864 int index
, rlen
, rentsize
;
866 /* Ok, first check if it's under an "isa" parent */
867 isa
= of_get_parent(np
);
868 if (!isa
|| strcmp(isa
->name
, "isa")) {
869 DBG("%s: no isa parent found\n", np
->full_name
);
873 /* Now look for an "ibm,aix-loc" property that gives us ordering
876 typep
= (char *)get_property(np
, "ibm,aix-loc", NULL
);
878 /* Get the ISA port number */
879 reg
= (struct isa_reg_property
*)get_property(np
, "reg", NULL
);
882 /* We assume the interrupt number isn't translated ... */
883 interrupts
= (u32
*)get_property(np
, "interrupts", NULL
);
884 /* get clock freq. if present */
885 clk
= (u32
*)get_property(np
, "clock-frequency", NULL
);
886 /* get default speed if present */
887 spd
= (u32
*)get_property(np
, "current-speed", NULL
);
888 /* Default to locate at end of array */
889 index
= old_serial_count
; /* end of the array by default */
891 /* If we have a location index, then use it */
892 if (typep
&& *typep
== 'S') {
893 index
= simple_strtol(typep
+1, NULL
, 0) - 1;
894 /* if index is out of range, use end of array instead */
895 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
896 index
= old_serial_count
;
897 /* if our index is still out of range, that mean that
898 * array is full, we could scan for a free slot but that
899 * make little sense to bother, just skip the port
901 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
903 if (index
>= old_serial_count
)
904 old_serial_count
= index
+ 1;
905 /* Check if there is a port who already claimed our slot */
906 if (serial_ports
[index
].iobase
!= 0) {
907 /* if we still have some room, move it, else override */
908 if (old_serial_count
< MAX_LEGACY_SERIAL_PORTS
) {
909 DBG("Moved legacy port %d -> %d\n", index
,
911 serial_ports
[old_serial_count
++] =
914 DBG("Replacing legacy port %d\n", index
);
918 if (index
>= MAX_LEGACY_SERIAL_PORTS
)
920 if (index
>= old_serial_count
)
921 old_serial_count
= index
+ 1;
923 /* Now fill the entry */
924 memset(&serial_ports
[index
], 0, sizeof(struct plat_serial8250_port
));
925 serial_ports
[index
].uartclk
= clk
? *clk
: BASE_BAUD
* 16;
926 serial_ports
[index
].iobase
= reg
->address
;
927 serial_ports
[index
].irq
= interrupts
? interrupts
[0] : 0;
928 serial_ports
[index
].flags
= ASYNC_BOOT_AUTOCONF
;
930 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
932 serial_ports
[index
].iobase
,
933 serial_ports
[index
].irq
,
934 serial_ports
[index
].uartclk
);
936 /* Get phys address of IO reg for port 1 */
940 pci
= of_get_parent(isa
);
942 DBG("%s: no pci parent found\n", np
->full_name
);
946 rangesp
= (u32
*)get_property(pci
, "ranges", &rlen
);
947 if (rangesp
== NULL
) {
953 /* we need the #size-cells of the PCI bridge node itself */
955 sizeprop
= (u32
*)get_property(pci
, "#size-cells", NULL
);
956 if (sizeprop
!= NULL
)
957 phys_size
= *sizeprop
;
958 /* we need the parent #addr-cells */
959 addr_size
= prom_n_addr_cells(pci
);
960 rentsize
= 3 + addr_size
+ phys_size
;
962 for (;rlen
>= rentsize
; rlen
-= rentsize
,rangesp
+= rentsize
) {
963 if (((rangesp
[0] >> 24) & 0x3) != 1)
964 continue; /* not IO space */
965 io_base
= rangesp
[3];
967 io_base
= (io_base
<< 32) | rangesp
[4];
970 *physport
= io_base
+ reg
->address
;
971 if (default_speed
&& spd
)
972 *default_speed
= *spd
;
979 DBG(" <- generic_find_legacy_serial_port()\n");
982 static struct platform_device serial_device
= {
983 .name
= "serial8250",
984 .id
= PLAT8250_DEV_PLATFORM
,
986 .platform_data
= serial_ports
,
990 static int __init
serial_dev_init(void)
992 return platform_device_register(&serial_device
);
994 arch_initcall(serial_dev_init
);
996 #endif /* CONFIG_PPC_ISERIES */
998 int check_legacy_ioport(unsigned long base_port
)
1000 if (ppc_md
.check_legacy_ioport
== NULL
)
1002 return ppc_md
.check_legacy_ioport(base_port
);
1004 EXPORT_SYMBOL(check_legacy_ioport
);
1007 static int __init
early_xmon(char *p
)
1009 /* ensure xmon is enabled */
1011 if (strncmp(p
, "on", 2) == 0)
1013 if (strncmp(p
, "off", 3) == 0)
1015 if (strncmp(p
, "early", 5) != 0)
1023 early_param("xmon", early_xmon
);