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>
64 #define DBG(fmt...) udbg_printf(fmt)
70 * Here are some early debugging facilities. You can enable one
71 * but your kernel will not boot on anything else if you do so
74 /* This one is for use on LPAR machines that support an HVC console
77 extern void udbg_init_debug_lpar(void);
78 /* This one is for use on Apple G5 machines
80 extern void udbg_init_pmac_realmode(void);
81 /* That's RTAS panel debug */
82 extern void call_rtas_display_status_delay(unsigned char c);
83 /* Here's maple real mode debug */
84 extern void udbg_init_maple_realmode(void);
86 #define EARLY_DEBUG_INIT() do {} while(0)
89 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
90 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
91 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
92 #define EARLY_DEBUG_INIT() \
93 do { udbg_putc = call_rtas_display_status_delay; } while(0)
96 /* extern void *stab; */
97 extern unsigned long klimit;
99 extern void mm_init_ppc64(void);
100 extern void stab_initialize(unsigned long stab);
101 extern void htab_initialize(void);
102 extern void early_init_devtree(void *flat_dt);
103 extern void unflatten_device_tree(void);
105 extern void smp_release_cpus(void);
109 int boot_cpuid_phys = 0;
113 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 * setup_cpu_maps - initialize the following cpu maps:
191 * Having the possible map set up early allows us to restrict allocations
192 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
194 * We do not initialize the online map here; cpus set their own bits in
195 * cpu_online_map as they come up.
197 * This function is valid only for Open Firmware systems. finish_device_tree
198 * must be called before using this.
200 * While we're here, we may as well set the "physical" cpu ids in the paca.
202 static void __init setup_cpu_maps(void)
204 struct device_node *dn = NULL;
210 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
212 int j, len = sizeof(u32), nthreads;
214 intserv = (u32 *)get_property(dn, "ibm,ppc-interrupt-server#s",
217 intserv = (u32 *)get_property(dn, "reg", NULL);
219 nthreads = len / sizeof(u32);
221 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
222 cpu_set(cpu, cpu_present_map);
223 set_hard_smp_processor_id(cpu, intserv[j]);
225 if (intserv[j] == boot_cpuid_phys)
227 cpu_set(cpu, cpu_possible_map);
232 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
233 * boot cpu is logical 0.
235 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
237 tmp = get_hard_smp_processor_id(0);
238 set_hard_smp_processor_id(0, boot_cpuid_phys);
239 set_hard_smp_processor_id(swap_cpuid, tmp);
243 * On pSeries LPAR, we need to know how many cpus
244 * could possibly be added to this partition.
246 if (systemcfg->platform == PLATFORM_PSERIES_LPAR &&
247 (dn = of_find_node_by_path("/rtas"))) {
248 int num_addr_cell, num_size_cell, maxcpus;
251 num_addr_cell = prom_n_addr_cells(dn);
252 num_size_cell = prom_n_size_cells(dn);
254 ireg = (unsigned int *)
255 get_property(dn, "ibm,lrdr-capacity", NULL);
260 maxcpus = ireg[num_addr_cell + num_size_cell];
262 /* Double maxcpus for processors which have SMT capability */
263 if (cpu_has_feature(CPU_FTR_SMT))
266 if (maxcpus > NR_CPUS) {
268 "Partition configured for %d cpus, "
269 "operating system maximum is %d.\n",
273 printk(KERN_INFO "Partition configured for %d cpus.\n",
276 for (cpu = 0; cpu < maxcpus; cpu++)
277 cpu_set(cpu, cpu_possible_map);
283 * Do the sibling map; assume only two threads per processor.
286 cpu_set(cpu, cpu_sibling_map[cpu]);
287 if (cpu_has_feature(CPU_FTR_SMT))
288 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
291 systemcfg->processorCount = num_present_cpus();
293 #endif /* CONFIG_SMP */
295 extern struct machdep_calls pSeries_md;
296 extern struct machdep_calls pmac_md;
297 extern struct machdep_calls maple_md;
298 extern struct machdep_calls bpa_md;
299 extern struct machdep_calls iseries_md;
301 /* Ultimately, stuff them in an elf section like initcalls... */
302 static struct machdep_calls __initdata *machines[] = {
303 #ifdef CONFIG_PPC_PSERIES
305 #endif /* CONFIG_PPC_PSERIES */
306 #ifdef CONFIG_PPC_PMAC
308 #endif /* CONFIG_PPC_PMAC */
309 #ifdef CONFIG_PPC_MAPLE
311 #endif /* CONFIG_PPC_MAPLE */
312 #ifdef CONFIG_PPC_BPA
315 #ifdef CONFIG_PPC_ISERIES
322 * Early initialization entry point. This is called by head.S
323 * with MMU translation disabled. We rely on the "feature" of
324 * the CPU that ignores the top 2 bits of the address in real
325 * mode so we can access kernel globals normally provided we
326 * only toy with things in the RMO region. From here, we do
327 * some early parsing of the device-tree to setup out LMB
328 * data structures, and allocate & initialize the hash table
329 * and segment tables so we can start running with translation
332 * It is this function which will call the probe() callback of
333 * the various platform types and copy the matching one to the
334 * global ppc_md structure. Your platform can eventually do
335 * some very early initializations from the probe() routine, but
336 * this is not recommended, be very careful as, for example, the
337 * device-tree is not accessible via normal means at this point.
340 void __init early_setup(unsigned long dt_ptr)
342 struct paca_struct *lpaca = get_paca();
343 static struct machdep_calls **mach;
346 * Enable early debugging if any specified (see top of
351 DBG(" -> early_setup()\n");
354 * Fill the default DBG level (do we want to keep
355 * that old mecanism around forever ?)
360 * Do early initializations using the flattened device
361 * tree, like retreiving the physical memory map or
362 * calculating/retreiving the hash table size
364 early_init_devtree(__va(dt_ptr));
367 * Iterate all ppc_md structures until we find the proper
368 * one for the current machine type
370 DBG("Probing machine type for platform %x...\n",
371 systemcfg->platform);
373 for (mach = machines; *mach; mach++) {
374 if ((*mach)->probe(systemcfg->platform))
377 /* What can we do if we didn't find ? */
379 DBG("No suitable machine found !\n");
384 DBG("Found, Initializing memory management...\n");
387 * Initialize stab / SLB management
389 if (!firmware_has_feature(FW_FEATURE_ISERIES))
390 stab_initialize(lpaca->stab_real);
393 * Initialize the MMU Hash table and create the linear mapping
398 DBG(" <- early_setup()\n");
403 * Initialize some remaining members of the ppc64_caches and systemcfg structures
404 * (at least until we get rid of them completely). This is mostly some
405 * cache informations about the CPU that will be used by cache flush
406 * routines and/or provided to userland
408 static void __init initialize_cache_info(void)
410 struct device_node *np;
411 unsigned long num_cpus = 0;
413 DBG(" -> initialize_cache_info()\n");
415 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
418 /* We're assuming *all* of the CPUs have the same
419 * d-cache and i-cache sizes... -Peter
422 if ( num_cpus == 1 ) {
427 /* Then read cache informations */
428 if (systemcfg->platform == PLATFORM_POWERMAC) {
429 dc = "d-cache-block-size";
430 ic = "i-cache-block-size";
432 dc = "d-cache-line-size";
433 ic = "i-cache-line-size";
437 lsize = cur_cpu_spec->dcache_bsize;
438 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
441 lsizep = (u32 *) get_property(np, dc, NULL);
444 if (sizep == 0 || lsizep == 0)
445 DBG("Argh, can't find dcache properties ! "
446 "sizep: %p, lsizep: %p\n", sizep, lsizep);
448 systemcfg->dcache_size = ppc64_caches.dsize = size;
449 systemcfg->dcache_line_size =
450 ppc64_caches.dline_size = lsize;
451 ppc64_caches.log_dline_size = __ilog2(lsize);
452 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
455 lsize = cur_cpu_spec->icache_bsize;
456 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
459 lsizep = (u32 *)get_property(np, ic, NULL);
462 if (sizep == 0 || lsizep == 0)
463 DBG("Argh, can't find icache properties ! "
464 "sizep: %p, lsizep: %p\n", sizep, lsizep);
466 systemcfg->icache_size = ppc64_caches.isize = size;
467 systemcfg->icache_line_size =
468 ppc64_caches.iline_size = lsize;
469 ppc64_caches.log_iline_size = __ilog2(lsize);
470 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
474 /* Add an eye catcher and the systemcfg layout version number */
475 strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
476 systemcfg->version.major = SYSTEMCFG_MAJOR;
477 systemcfg->version.minor = SYSTEMCFG_MINOR;
478 systemcfg->processor = mfspr(SPRN_PVR);
480 DBG(" <- initialize_cache_info()\n");
483 static void __init check_for_initrd(void)
485 #ifdef CONFIG_BLK_DEV_INITRD
488 DBG(" -> check_for_initrd()\n");
491 prop = (u64 *)get_property(of_chosen,
492 "linux,initrd-start", NULL);
494 initrd_start = (unsigned long)__va(*prop);
495 prop = (u64 *)get_property(of_chosen,
496 "linux,initrd-end", NULL);
498 initrd_end = (unsigned long)__va(*prop);
499 initrd_below_start_ok = 1;
505 /* If we were passed an initrd, set the ROOT_DEV properly if the values
506 * look sensible. If not, clear initrd reference.
508 if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
509 initrd_end > initrd_start)
510 ROOT_DEV = Root_RAM0;
512 initrd_start = initrd_end = 0;
515 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
517 DBG(" <- check_for_initrd()\n");
518 #endif /* CONFIG_BLK_DEV_INITRD */
522 * Do some initial setup of the system. The parameters are those which
523 * were passed in from the bootloader.
525 void __init setup_system(void)
527 DBG(" -> setup_system()\n");
530 * Unflatten the device-tree passed by prom_init or kexec
532 unflatten_device_tree();
535 * Fill the ppc64_caches & systemcfg structures with informations
536 * retreived from the device-tree. Need to be called before
537 * finish_device_tree() since the later requires some of the
538 * informations filled up here to properly parse the interrupt
540 * It also sets up the cache line sizes which allows to call
541 * routines like flush_icache_range (used by the hash init
544 initialize_cache_info();
546 #ifdef CONFIG_PPC_RTAS
548 * Initialize RTAS if available
551 #endif /* CONFIG_PPC_RTAS */
554 * Check if we have an initrd provided via the device-tree
559 * Do some platform specific early initializations, that includes
560 * setting up the hash table pointers. It also sets up some interrupt-mapping
561 * related options that will be used by finish_device_tree()
566 * "Finish" the device-tree, that is do the actual parsing of
567 * some of the properties like the interrupt map
569 finish_device_tree();
571 #ifdef CONFIG_BOOTX_TEXT
578 #ifdef CONFIG_XMON_DEFAULT
582 * Register early console
584 register_early_udbg_console();
586 /* Save unparsed command line copy for /proc/cmdline */
587 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
593 * iSeries has already initialized the cpu maps at this point.
597 /* Release secondary cpus out of their spinloops at 0x60 now that
598 * we can map physical -> logical CPU ids
603 printk("Starting Linux PPC64 %s\n", system_utsname.version);
605 printk("-----------------------------------------------------\n");
606 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
607 printk("ppc64_debug_switch = 0x%lx\n", ppc64_debug_switch);
608 printk("ppc64_interrupt_controller = 0x%ld\n", ppc64_interrupt_controller);
609 printk("systemcfg = 0x%p\n", systemcfg);
610 printk("systemcfg->platform = 0x%x\n", systemcfg->platform);
611 printk("systemcfg->processorCount = 0x%lx\n", systemcfg->processorCount);
612 printk("systemcfg->physicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
613 printk("ppc64_caches.dcache_line_size = 0x%x\n",
614 ppc64_caches.dline_size);
615 printk("ppc64_caches.icache_line_size = 0x%x\n",
616 ppc64_caches.iline_size);
617 printk("htab_address = 0x%p\n", htab_address);
618 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
619 printk("-----------------------------------------------------\n");
623 DBG(" <- setup_system()\n");
626 static int ppc64_panic_event(struct notifier_block *this,
627 unsigned long event, void *ptr)
629 ppc_md.panic((char *)ptr); /* May not return */
634 * These three variables are used to save values passed to us by prom_init()
635 * via the device tree. The TCE variables are needed because with a memory_limit
636 * in force we may need to explicitly map the TCE are at the top of RAM.
638 unsigned long memory_limit;
639 unsigned long tce_alloc_start;
640 unsigned long tce_alloc_end;
642 #ifdef CONFIG_PPC_ISERIES
644 * On iSeries we just parse the mem=X option from the command line.
645 * On pSeries it's a bit more complicated, see prom_init_mem()
647 static int __init early_parsemem(char *p)
652 memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
656 early_param("mem", early_parsemem);
657 #endif /* CONFIG_PPC_ISERIES */
659 #ifdef CONFIG_IRQSTACKS
660 static void __init irqstack_early_init(void)
665 * interrupt stacks must be under 256MB, we cannot afford to take
666 * SLB misses on them.
669 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
670 THREAD_SIZE, 0x10000000));
671 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
672 THREAD_SIZE, 0x10000000));
676 #define irqstack_early_init()
680 * Stack space used when we detect a bad kernel stack pointer, and
681 * early in SMP boots before relocation is enabled.
683 static void __init emergency_stack_init(void)
689 * Emergency stacks must be under 256MB, we cannot afford to take
690 * SLB misses on them. The ABI also requires them to be 128-byte
693 * Since we use these as temporary stacks during secondary CPU
694 * bringup, we need to get at them in real mode. This means they
695 * must also be within the RMO region.
697 limit = min(0x10000000UL, lmb.rmo_size);
700 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
704 extern unsigned long *sys_call_table;
705 extern unsigned long sys_ni_syscall;
706 #ifdef CONFIG_PPC_MERGE
707 #define SYS_CALL_ENTRY64(i) sys_call_table[(i) * 2]
708 #define SYS_CALL_ENTRY32(i) sys_call_table[(i) * 2 + 1]
710 extern unsigned long *sys_call_table32;
711 #define SYS_CALL_ENTRY64(i) sys_call_table[(i)]
712 #define SYS_CALL_ENTRY32(i) sys_call_table32[(i)]
716 * Called from setup_arch to initialize the bitmap of available
717 * syscalls in the systemcfg page
719 void __init setup_syscall_map(void)
721 unsigned int i, count64 = 0, count32 = 0;
723 for (i = 0; i < __NR_syscalls; i++) {
724 if (SYS_CALL_ENTRY64(i) != sys_ni_syscall) {
726 systemcfg->syscall_map_64[i >> 5] |=
727 0x80000000UL >> (i & 0x1f);
729 if (SYS_CALL_ENTRY32(i) != sys_ni_syscall) {
731 systemcfg->syscall_map_32[i >> 5] |=
732 0x80000000UL >> (i & 0x1f);
735 printk(KERN_INFO "Syscall map setup, %d 32-bit and %d 64-bit syscalls\n",
740 * Called into from start_kernel, after lock_kernel has been called.
741 * Initializes bootmem, which is unsed to manage page allocation until
742 * mem_init is called.
744 void __init setup_arch(char **cmdline_p)
746 extern void do_init_bootmem(void);
748 ppc64_boot_msg(0x12, "Setup Arch");
750 *cmdline_p = cmd_line;
753 * Set cache line size based on type of cpu as a default.
754 * Systems with OF can look in the properties on the cpu node(s)
755 * for a possibly more accurate value.
757 dcache_bsize = ppc64_caches.dline_size;
758 icache_bsize = ppc64_caches.iline_size;
760 /* reboot on panic */
764 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
766 init_mm.start_code = PAGE_OFFSET;
767 init_mm.end_code = (unsigned long) _etext;
768 init_mm.end_data = (unsigned long) _edata;
769 init_mm.brk = klimit;
771 irqstack_early_init();
772 emergency_stack_init();
776 /* set up the bootmem stuff with available memory */
780 /* initialize the syscall map in systemcfg */
783 #ifdef CONFIG_DUMMY_CONSOLE
784 conswitchp = &dummy_con;
789 /* Use the default idle loop if the platform hasn't provided one. */
790 if (NULL == ppc_md.idle_loop) {
791 ppc_md.idle_loop = default_idle;
792 printk(KERN_INFO "Using default idle loop\n");
796 ppc64_boot_msg(0x15, "Setup Done");
800 /* ToDo: do something useful if ppc_md is not yet setup. */
801 #define PPC64_LINUX_FUNCTION 0x0f000000
802 #define PPC64_IPL_MESSAGE 0xc0000000
803 #define PPC64_TERM_MESSAGE 0xb0000000
805 static void ppc64_do_msg(unsigned int src, const char *msg)
807 if (ppc_md.progress) {
810 sprintf(buf, "%08X\n", src);
811 ppc_md.progress(buf, 0);
812 snprintf(buf, 128, "%s", msg);
813 ppc_md.progress(buf, 0);
817 /* Print a boot progress message. */
818 void ppc64_boot_msg(unsigned int src, const char *msg)
820 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
821 printk("[boot]%04x %s\n", src, msg);
824 /* Print a termination message (print only -- does not stop the kernel) */
825 void ppc64_terminate_msg(unsigned int src, const char *msg)
827 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
828 printk("[terminate]%04x %s\n", src, msg);
831 #ifndef CONFIG_PPC_ISERIES
833 * This function can be used by platforms to "find" legacy serial ports.
834 * It works for "serial" nodes under an "isa" node, and will try to
835 * respect the "ibm,aix-loc" property if any. It works with up to 8
839 #define MAX_LEGACY_SERIAL_PORTS 8
840 static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
841 static unsigned int old_serial_count;
843 void __init generic_find_legacy_serial_ports(u64 *physport,
844 unsigned int *default_speed)
846 struct device_node *np;
849 struct isa_reg_property {
854 struct pci_reg_property {
855 struct pci_address addr;
860 DBG(" -> generic_find_legacy_serial_port()\n");
866 np = of_find_node_by_path("/");
870 /* First fill our array */
871 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
872 struct device_node *isa, *pci;
873 struct isa_reg_property *reg;
874 unsigned long phys_size, addr_size, io_base;
876 u32 *interrupts, *clk, *spd;
878 int index, rlen, rentsize;
880 /* Ok, first check if it's under an "isa" parent */
881 isa = of_get_parent(np);
882 if (!isa || strcmp(isa->name, "isa")) {
883 DBG("%s: no isa parent found\n", np->full_name);
887 /* Now look for an "ibm,aix-loc" property that gives us ordering
890 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
892 /* Get the ISA port number */
893 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
896 /* We assume the interrupt number isn't translated ... */
897 interrupts = (u32 *)get_property(np, "interrupts", NULL);
898 /* get clock freq. if present */
899 clk = (u32 *)get_property(np, "clock-frequency", NULL);
900 /* get default speed if present */
901 spd = (u32 *)get_property(np, "current-speed", NULL);
902 /* Default to locate at end of array */
903 index = old_serial_count; /* end of the array by default */
905 /* If we have a location index, then use it */
906 if (typep && *typep == 'S') {
907 index = simple_strtol(typep+1, NULL, 0) - 1;
908 /* if index is out of range, use end of array instead */
909 if (index >= MAX_LEGACY_SERIAL_PORTS)
910 index = old_serial_count;
911 /* if our index is still out of range, that mean that
912 * array is full, we could scan for a free slot but that
913 * make little sense to bother, just skip the port
915 if (index >= MAX_LEGACY_SERIAL_PORTS)
917 if (index >= old_serial_count)
918 old_serial_count = index + 1;
919 /* Check if there is a port who already claimed our slot */
920 if (serial_ports[index].iobase != 0) {
921 /* if we still have some room, move it, else override */
922 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
923 DBG("Moved legacy port %d -> %d\n", index,
925 serial_ports[old_serial_count++] =
928 DBG("Replacing legacy port %d\n", index);
932 if (index >= MAX_LEGACY_SERIAL_PORTS)
934 if (index >= old_serial_count)
935 old_serial_count = index + 1;
937 /* Now fill the entry */
938 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
939 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
940 serial_ports[index].iobase = reg->address;
941 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
942 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
944 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
946 serial_ports[index].iobase,
947 serial_ports[index].irq,
948 serial_ports[index].uartclk);
950 /* Get phys address of IO reg for port 1 */
954 pci = of_get_parent(isa);
956 DBG("%s: no pci parent found\n", np->full_name);
960 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
961 if (rangesp == NULL) {
967 /* we need the #size-cells of the PCI bridge node itself */
969 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
970 if (sizeprop != NULL)
971 phys_size = *sizeprop;
972 /* we need the parent #addr-cells */
973 addr_size = prom_n_addr_cells(pci);
974 rentsize = 3 + addr_size + phys_size;
976 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
977 if (((rangesp[0] >> 24) & 0x3) != 1)
978 continue; /* not IO space */
979 io_base = rangesp[3];
981 io_base = (io_base << 32) | rangesp[4];
984 *physport = io_base + reg->address;
985 if (default_speed && spd)
986 *default_speed = *spd;
993 DBG(" <- generic_find_legacy_serial_port()\n");
996 static struct platform_device serial_device = {
997 .name = "serial8250",
998 .id = PLAT8250_DEV_PLATFORM,
1000 .platform_data = serial_ports,
1004 static int __init serial_dev_init(void)
1006 return platform_device_register(&serial_device);
1008 arch_initcall(serial_dev_init);
1010 #endif /* CONFIG_PPC_ISERIES */
1012 int check_legacy_ioport(unsigned long base_port)
1014 if (ppc_md.check_legacy_ioport == NULL)
1016 return ppc_md.check_legacy_ioport(base_port);
1018 EXPORT_SYMBOL(check_legacy_ioport);
1021 static int __init early_xmon(char *p)
1023 /* ensure xmon is enabled */
1025 if (strncmp(p, "on", 2) == 0)
1027 if (strncmp(p, "off", 3) == 0)
1029 if (strncmp(p, "early", 5) != 0)
1037 early_param("xmon", early_xmon);