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 bpa_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_BPA
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_PPC_ISERIES
636 * On iSeries we just parse the mem=X option from the command line.
637 * On pSeries it's a bit more complicated, see prom_init_mem()
639 static int __init early_parsemem(char *p)
644 memory_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
648 early_param("mem", early_parsemem);
649 #endif /* CONFIG_PPC_ISERIES */
651 #ifdef CONFIG_IRQSTACKS
652 static void __init irqstack_early_init(void)
657 * interrupt stacks must be under 256MB, we cannot afford to take
658 * SLB misses on them.
661 softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
662 THREAD_SIZE, 0x10000000));
663 hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
664 THREAD_SIZE, 0x10000000));
668 #define irqstack_early_init()
672 * Stack space used when we detect a bad kernel stack pointer, and
673 * early in SMP boots before relocation is enabled.
675 static void __init emergency_stack_init(void)
681 * Emergency stacks must be under 256MB, we cannot afford to take
682 * SLB misses on them. The ABI also requires them to be 128-byte
685 * Since we use these as temporary stacks during secondary CPU
686 * bringup, we need to get at them in real mode. This means they
687 * must also be within the RMO region.
689 limit = min(0x10000000UL, lmb.rmo_size);
692 paca[i].emergency_sp = __va(lmb_alloc_base(PAGE_SIZE, 128,
697 * Called from setup_arch to initialize the bitmap of available
698 * syscalls in the systemcfg page
700 void __init setup_syscall_map(void)
702 unsigned int i, count64 = 0, count32 = 0;
703 extern unsigned long *sys_call_table;
704 extern unsigned long sys_ni_syscall;
707 for (i = 0; i < __NR_syscalls; i++) {
708 if (sys_call_table[i*2] != sys_ni_syscall) {
710 systemcfg->syscall_map_64[i >> 5] |=
711 0x80000000UL >> (i & 0x1f);
713 if (sys_call_table[i*2+1] != sys_ni_syscall) {
715 systemcfg->syscall_map_32[i >> 5] |=
716 0x80000000UL >> (i & 0x1f);
719 printk(KERN_INFO "Syscall map setup, %d 32-bit and %d 64-bit syscalls\n",
724 * Called into from start_kernel, after lock_kernel has been called.
725 * Initializes bootmem, which is unsed to manage page allocation until
726 * mem_init is called.
728 void __init setup_arch(char **cmdline_p)
730 extern void do_init_bootmem(void);
732 ppc64_boot_msg(0x12, "Setup Arch");
734 *cmdline_p = cmd_line;
737 * Set cache line size based on type of cpu as a default.
738 * Systems with OF can look in the properties on the cpu node(s)
739 * for a possibly more accurate value.
741 dcache_bsize = ppc64_caches.dline_size;
742 icache_bsize = ppc64_caches.iline_size;
744 /* reboot on panic */
748 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
750 init_mm.start_code = PAGE_OFFSET;
751 init_mm.end_code = (unsigned long) _etext;
752 init_mm.end_data = (unsigned long) _edata;
753 init_mm.brk = klimit;
755 irqstack_early_init();
756 emergency_stack_init();
760 /* set up the bootmem stuff with available memory */
764 /* initialize the syscall map in systemcfg */
767 #ifdef CONFIG_DUMMY_CONSOLE
768 conswitchp = &dummy_con;
773 /* Use the default idle loop if the platform hasn't provided one. */
774 if (NULL == ppc_md.idle_loop) {
775 ppc_md.idle_loop = default_idle;
776 printk(KERN_INFO "Using default idle loop\n");
780 ppc64_boot_msg(0x15, "Setup Done");
784 /* ToDo: do something useful if ppc_md is not yet setup. */
785 #define PPC64_LINUX_FUNCTION 0x0f000000
786 #define PPC64_IPL_MESSAGE 0xc0000000
787 #define PPC64_TERM_MESSAGE 0xb0000000
789 static void ppc64_do_msg(unsigned int src, const char *msg)
791 if (ppc_md.progress) {
794 sprintf(buf, "%08X\n", src);
795 ppc_md.progress(buf, 0);
796 snprintf(buf, 128, "%s", msg);
797 ppc_md.progress(buf, 0);
801 /* Print a boot progress message. */
802 void ppc64_boot_msg(unsigned int src, const char *msg)
804 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
805 printk("[boot]%04x %s\n", src, msg);
808 /* Print a termination message (print only -- does not stop the kernel) */
809 void ppc64_terminate_msg(unsigned int src, const char *msg)
811 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
812 printk("[terminate]%04x %s\n", src, msg);
815 #ifndef CONFIG_PPC_ISERIES
817 * This function can be used by platforms to "find" legacy serial ports.
818 * It works for "serial" nodes under an "isa" node, and will try to
819 * respect the "ibm,aix-loc" property if any. It works with up to 8
823 #define MAX_LEGACY_SERIAL_PORTS 8
824 static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
825 static unsigned int old_serial_count;
827 void __init generic_find_legacy_serial_ports(u64 *physport,
828 unsigned int *default_speed)
830 struct device_node *np;
833 struct isa_reg_property {
838 struct pci_reg_property {
839 struct pci_address addr;
844 DBG(" -> generic_find_legacy_serial_port()\n");
850 np = of_find_node_by_path("/");
854 /* First fill our array */
855 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
856 struct device_node *isa, *pci;
857 struct isa_reg_property *reg;
858 unsigned long phys_size, addr_size, io_base;
860 u32 *interrupts, *clk, *spd;
862 int index, rlen, rentsize;
864 /* Ok, first check if it's under an "isa" parent */
865 isa = of_get_parent(np);
866 if (!isa || strcmp(isa->name, "isa")) {
867 DBG("%s: no isa parent found\n", np->full_name);
871 /* Now look for an "ibm,aix-loc" property that gives us ordering
874 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
876 /* Get the ISA port number */
877 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
880 /* We assume the interrupt number isn't translated ... */
881 interrupts = (u32 *)get_property(np, "interrupts", NULL);
882 /* get clock freq. if present */
883 clk = (u32 *)get_property(np, "clock-frequency", NULL);
884 /* get default speed if present */
885 spd = (u32 *)get_property(np, "current-speed", NULL);
886 /* Default to locate at end of array */
887 index = old_serial_count; /* end of the array by default */
889 /* If we have a location index, then use it */
890 if (typep && *typep == 'S') {
891 index = simple_strtol(typep+1, NULL, 0) - 1;
892 /* if index is out of range, use end of array instead */
893 if (index >= MAX_LEGACY_SERIAL_PORTS)
894 index = old_serial_count;
895 /* if our index is still out of range, that mean that
896 * array is full, we could scan for a free slot but that
897 * make little sense to bother, just skip the port
899 if (index >= MAX_LEGACY_SERIAL_PORTS)
901 if (index >= old_serial_count)
902 old_serial_count = index + 1;
903 /* Check if there is a port who already claimed our slot */
904 if (serial_ports[index].iobase != 0) {
905 /* if we still have some room, move it, else override */
906 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
907 DBG("Moved legacy port %d -> %d\n", index,
909 serial_ports[old_serial_count++] =
912 DBG("Replacing legacy port %d\n", index);
916 if (index >= MAX_LEGACY_SERIAL_PORTS)
918 if (index >= old_serial_count)
919 old_serial_count = index + 1;
921 /* Now fill the entry */
922 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
923 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
924 serial_ports[index].iobase = reg->address;
925 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
926 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
928 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
930 serial_ports[index].iobase,
931 serial_ports[index].irq,
932 serial_ports[index].uartclk);
934 /* Get phys address of IO reg for port 1 */
938 pci = of_get_parent(isa);
940 DBG("%s: no pci parent found\n", np->full_name);
944 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
945 if (rangesp == NULL) {
951 /* we need the #size-cells of the PCI bridge node itself */
953 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
954 if (sizeprop != NULL)
955 phys_size = *sizeprop;
956 /* we need the parent #addr-cells */
957 addr_size = prom_n_addr_cells(pci);
958 rentsize = 3 + addr_size + phys_size;
960 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
961 if (((rangesp[0] >> 24) & 0x3) != 1)
962 continue; /* not IO space */
963 io_base = rangesp[3];
965 io_base = (io_base << 32) | rangesp[4];
968 *physport = io_base + reg->address;
969 if (default_speed && spd)
970 *default_speed = *spd;
977 DBG(" <- generic_find_legacy_serial_port()\n");
980 static struct platform_device serial_device = {
981 .name = "serial8250",
982 .id = PLAT8250_DEV_PLATFORM,
984 .platform_data = serial_ports,
988 static int __init serial_dev_init(void)
990 return platform_device_register(&serial_device);
992 arch_initcall(serial_dev_init);
994 #endif /* CONFIG_PPC_ISERIES */
996 int check_legacy_ioport(unsigned long base_port)
998 if (ppc_md.check_legacy_ioport == NULL)
1000 return ppc_md.check_legacy_ioport(base_port);
1002 EXPORT_SYMBOL(check_legacy_ioport);
1005 static int __init early_xmon(char *p)
1007 /* ensure xmon is enabled */
1009 if (strncmp(p, "on", 2) == 0)
1011 if (strncmp(p, "off", 3) == 0)
1013 if (strncmp(p, "early", 5) != 0)
1021 early_param("xmon", early_xmon);