3 * Common boot and setup code.
5 * Copyright (C) 2001 PPC64 Team, IBM Corp
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
15 #include <linux/config.h>
16 #include <linux/module.h>
17 #include <linux/string.h>
18 #include <linux/sched.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/reboot.h>
22 #include <linux/delay.h>
23 #include <linux/initrd.h>
24 #include <linux/ide.h>
25 #include <linux/seq_file.h>
26 #include <linux/ioport.h>
27 #include <linux/console.h>
28 #include <linux/utsname.h>
29 #include <linux/tty.h>
30 #include <linux/root_dev.h>
31 #include <linux/notifier.h>
32 #include <linux/cpu.h>
33 #include <linux/unistd.h>
34 #include <linux/serial.h>
35 #include <linux/serial_8250.h>
38 #include <asm/processor.h>
39 #include <asm/pgtable.h>
42 #include <asm/machdep.h>
45 #include <asm/cputable.h>
46 #include <asm/sections.h>
47 #include <asm/btext.h>
48 #include <asm/nvram.h>
49 #include <asm/setup.h>
50 #include <asm/system.h>
52 #include <asm/iommu.h>
53 #include <asm/serial.h>
54 #include <asm/cache.h>
58 #include <asm/iseries/it_lp_naca.h>
59 #include <asm/firmware.h>
62 #include <asm/kexec.h>
67 #define DBG(fmt...) udbg_printf(fmt)
73 * Here are some early debugging facilities. You can enable one
74 * but your kernel will not boot on anything else if you do so
77 /* This one is for use on LPAR machines that support an HVC console
80 extern void udbg_init_debug_lpar(void);
81 /* This one is for use on Apple G5 machines
83 extern void udbg_init_pmac_realmode(void);
84 /* That's RTAS panel debug */
85 extern void call_rtas_display_status_delay(unsigned char c);
86 /* Here's maple real mode debug */
87 extern void udbg_init_maple_realmode(void);
89 #define EARLY_DEBUG_INIT() do {} while(0)
92 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar()
93 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode()
94 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode()
95 #define EARLY_DEBUG_INIT() \
96 do { udbg_putc = call_rtas_display_status_delay; } while(0)
101 int boot_cpuid_phys = 0;
105 struct ppc64_caches ppc64_caches;
106 EXPORT_SYMBOL_GPL(ppc64_caches);
109 * These are used in binfmt_elf.c to put aux entries on the stack
110 * for each elf executable being started.
116 /* The main machine-dep calls structure
118 struct machdep_calls ppc_md;
119 EXPORT_SYMBOL(ppc_md);
121 #ifdef CONFIG_MAGIC_SYSRQ
122 unsigned long SYSRQ_KEY;
123 #endif /* CONFIG_MAGIC_SYSRQ */
126 static int ppc64_panic_event(struct notifier_block *, unsigned long, void *);
127 static struct notifier_block ppc64_panic_block = {
128 .notifier_call = ppc64_panic_event,
129 .priority = INT_MIN /* may not return; must be done last */
134 static int smt_enabled_cmdline;
136 /* Look for ibm,smt-enabled OF option */
137 static void check_smt_enabled(void)
139 struct device_node *dn;
142 /* Allow the command line to overrule the OF option */
143 if (smt_enabled_cmdline)
146 dn = of_find_node_by_path("/options");
149 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL);
152 if (!strcmp(smt_option, "on"))
153 smt_enabled_at_boot = 1;
154 else if (!strcmp(smt_option, "off"))
155 smt_enabled_at_boot = 0;
160 /* Look for smt-enabled= cmdline option */
161 static int __init early_smt_enabled(char *p)
163 smt_enabled_cmdline = 1;
168 if (!strcmp(p, "on") || !strcmp(p, "1"))
169 smt_enabled_at_boot = 1;
170 else if (!strcmp(p, "off") || !strcmp(p, "0"))
171 smt_enabled_at_boot = 0;
175 early_param("smt-enabled", early_smt_enabled);
178 #define check_smt_enabled()
179 #endif /* CONFIG_SMP */
181 extern struct machdep_calls pSeries_md;
182 extern struct machdep_calls pmac_md;
183 extern struct machdep_calls maple_md;
184 extern struct machdep_calls cell_md;
185 extern struct machdep_calls iseries_md;
187 /* Ultimately, stuff them in an elf section like initcalls... */
188 static struct machdep_calls __initdata *machines[] = {
189 #ifdef CONFIG_PPC_PSERIES
191 #endif /* CONFIG_PPC_PSERIES */
192 #ifdef CONFIG_PPC_PMAC
194 #endif /* CONFIG_PPC_PMAC */
195 #ifdef CONFIG_PPC_MAPLE
197 #endif /* CONFIG_PPC_MAPLE */
198 #ifdef CONFIG_PPC_CELL
201 #ifdef CONFIG_PPC_ISERIES
208 * Early initialization entry point. This is called by head.S
209 * with MMU translation disabled. We rely on the "feature" of
210 * the CPU that ignores the top 2 bits of the address in real
211 * mode so we can access kernel globals normally provided we
212 * only toy with things in the RMO region. From here, we do
213 * some early parsing of the device-tree to setup out LMB
214 * data structures, and allocate & initialize the hash table
215 * and segment tables so we can start running with translation
218 * It is this function which will call the probe() callback of
219 * the various platform types and copy the matching one to the
220 * global ppc_md structure. Your platform can eventually do
221 * some very early initializations from the probe() routine, but
222 * this is not recommended, be very careful as, for example, the
223 * device-tree is not accessible via normal means at this point.
226 void __init early_setup(unsigned long dt_ptr)
228 struct paca_struct *lpaca = get_paca();
229 static struct machdep_calls **mach;
232 * Enable early debugging if any specified (see top of
237 DBG(" -> early_setup()\n");
240 * Do early initializations using the flattened device
241 * tree, like retreiving the physical memory map or
242 * calculating/retreiving the hash table size
244 early_init_devtree(__va(dt_ptr));
247 * Iterate all ppc_md structures until we find the proper
248 * one for the current machine type
250 DBG("Probing machine type for platform %x...\n", _machine);
252 for (mach = machines; *mach; mach++) {
253 if ((*mach)->probe(_machine))
256 /* What can we do if we didn't find ? */
258 DBG("No suitable machine found !\n");
263 DBG("Found, Initializing memory management...\n");
266 * Initialize the MMU Hash table and create the linear mapping
267 * of memory. Has to be done before stab/slb initialization as
268 * this is currently where the page size encoding is obtained
273 * Initialize stab / SLB management except on iSeries
275 if (!firmware_has_feature(FW_FEATURE_ISERIES)) {
276 if (cpu_has_feature(CPU_FTR_SLB))
279 stab_initialize(lpaca->stab_real);
282 DBG(" <- early_setup()\n");
286 void early_setup_secondary(void)
288 struct paca_struct *lpaca = get_paca();
290 /* Mark enabled in PACA */
291 lpaca->proc_enabled = 0;
293 /* Initialize hash table for that CPU */
294 htab_initialize_secondary();
296 /* Initialize STAB/SLB. We use a virtual address as it works
297 * in real mode on pSeries and we want a virutal address on
300 if (cpu_has_feature(CPU_FTR_SLB))
303 stab_initialize(lpaca->stab_addr);
306 #endif /* CONFIG_SMP */
308 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
309 void smp_release_cpus(void)
311 extern unsigned long __secondary_hold_spinloop;
313 DBG(" -> smp_release_cpus()\n");
315 /* All secondary cpus are spinning on a common spinloop, release them
316 * all now so they can start to spin on their individual paca
317 * spinloops. For non SMP kernels, the secondary cpus never get out
318 * of the common spinloop.
319 * This is useless but harmless on iSeries, secondaries are already
320 * waiting on their paca spinloops. */
322 __secondary_hold_spinloop = 1;
325 DBG(" <- smp_release_cpus()\n");
328 #define smp_release_cpus()
329 #endif /* CONFIG_SMP || CONFIG_KEXEC */
332 * Initialize some remaining members of the ppc64_caches and systemcfg
334 * (at least until we get rid of them completely). This is mostly some
335 * cache informations about the CPU that will be used by cache flush
336 * routines and/or provided to userland
338 static void __init initialize_cache_info(void)
340 struct device_node *np;
341 unsigned long num_cpus = 0;
343 DBG(" -> initialize_cache_info()\n");
345 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
348 /* We're assuming *all* of the CPUs have the same
349 * d-cache and i-cache sizes... -Peter
352 if ( num_cpus == 1 ) {
357 /* Then read cache informations */
358 if (_machine == PLATFORM_POWERMAC) {
359 dc = "d-cache-block-size";
360 ic = "i-cache-block-size";
362 dc = "d-cache-line-size";
363 ic = "i-cache-line-size";
367 lsize = cur_cpu_spec->dcache_bsize;
368 sizep = (u32 *)get_property(np, "d-cache-size", NULL);
371 lsizep = (u32 *) get_property(np, dc, NULL);
374 if (sizep == 0 || lsizep == 0)
375 DBG("Argh, can't find dcache properties ! "
376 "sizep: %p, lsizep: %p\n", sizep, lsizep);
378 ppc64_caches.dsize = size;
379 ppc64_caches.dline_size = lsize;
380 ppc64_caches.log_dline_size = __ilog2(lsize);
381 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
384 lsize = cur_cpu_spec->icache_bsize;
385 sizep = (u32 *)get_property(np, "i-cache-size", NULL);
388 lsizep = (u32 *)get_property(np, ic, NULL);
391 if (sizep == 0 || lsizep == 0)
392 DBG("Argh, can't find icache properties ! "
393 "sizep: %p, lsizep: %p\n", sizep, lsizep);
395 ppc64_caches.isize = size;
396 ppc64_caches.iline_size = lsize;
397 ppc64_caches.log_iline_size = __ilog2(lsize);
398 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
402 DBG(" <- initialize_cache_info()\n");
407 * Do some initial setup of the system. The parameters are those which
408 * were passed in from the bootloader.
410 void __init setup_system(void)
412 DBG(" -> setup_system()\n");
415 * Unflatten the device-tree passed by prom_init or kexec
417 unflatten_device_tree();
420 kexec_setup(); /* requires unflattened device tree. */
424 * Fill the ppc64_caches & systemcfg structures with informations
425 * retreived from the device-tree. Need to be called before
426 * finish_device_tree() since the later requires some of the
427 * informations filled up here to properly parse the interrupt
429 * It also sets up the cache line sizes which allows to call
430 * routines like flush_icache_range (used by the hash init
433 initialize_cache_info();
435 #ifdef CONFIG_PPC_RTAS
437 * Initialize RTAS if available
440 #endif /* CONFIG_PPC_RTAS */
443 * Check if we have an initrd provided via the device-tree
448 * Do some platform specific early initializations, that includes
449 * setting up the hash table pointers. It also sets up some interrupt-mapping
450 * related options that will be used by finish_device_tree()
455 * "Finish" the device-tree, that is do the actual parsing of
456 * some of the properties like the interrupt map
458 finish_device_tree();
460 #ifdef CONFIG_BOOTX_TEXT
467 #ifdef CONFIG_XMON_DEFAULT
471 * Register early console
473 register_early_udbg_console();
475 /* Save unparsed command line copy for /proc/cmdline */
476 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
481 smp_setup_cpu_maps();
483 /* Release secondary cpus out of their spinloops at 0x60 now that
484 * we can map physical -> logical CPU ids
488 printk("Starting Linux PPC64 %s\n", system_utsname.version);
490 printk("-----------------------------------------------------\n");
491 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size);
492 printk("ppc64_interrupt_controller = 0x%ld\n",
493 ppc64_interrupt_controller);
494 printk("platform = 0x%x\n", _machine);
495 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size());
496 printk("ppc64_caches.dcache_line_size = 0x%x\n",
497 ppc64_caches.dline_size);
498 printk("ppc64_caches.icache_line_size = 0x%x\n",
499 ppc64_caches.iline_size);
500 printk("htab_address = 0x%p\n", htab_address);
501 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
502 printk("-----------------------------------------------------\n");
506 DBG(" <- setup_system()\n");
509 static int ppc64_panic_event(struct notifier_block *this,
510 unsigned long event, void *ptr)
512 ppc_md.panic((char *)ptr); /* May not return */
516 #ifdef CONFIG_IRQSTACKS
517 static void __init irqstack_early_init(void)
522 * interrupt stacks must be under 256MB, we cannot afford to take
523 * SLB misses on them.
526 softirq_ctx[i] = (struct thread_info *)
527 __va(lmb_alloc_base(THREAD_SIZE,
528 THREAD_SIZE, 0x10000000));
529 hardirq_ctx[i] = (struct thread_info *)
530 __va(lmb_alloc_base(THREAD_SIZE,
531 THREAD_SIZE, 0x10000000));
535 #define irqstack_early_init()
539 * Stack space used when we detect a bad kernel stack pointer, and
540 * early in SMP boots before relocation is enabled.
542 static void __init emergency_stack_init(void)
548 * Emergency stacks must be under 256MB, we cannot afford to take
549 * SLB misses on them. The ABI also requires them to be 128-byte
552 * Since we use these as temporary stacks during secondary CPU
553 * bringup, we need to get at them in real mode. This means they
554 * must also be within the RMO region.
556 limit = min(0x10000000UL, lmb.rmo_size);
559 paca[i].emergency_sp =
560 __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
564 * Called into from start_kernel, after lock_kernel has been called.
565 * Initializes bootmem, which is unsed to manage page allocation until
566 * mem_init is called.
568 void __init setup_arch(char **cmdline_p)
570 extern void do_init_bootmem(void);
572 ppc64_boot_msg(0x12, "Setup Arch");
574 *cmdline_p = cmd_line;
577 * Set cache line size based on type of cpu as a default.
578 * Systems with OF can look in the properties on the cpu node(s)
579 * for a possibly more accurate value.
581 dcache_bsize = ppc64_caches.dline_size;
582 icache_bsize = ppc64_caches.iline_size;
584 /* reboot on panic */
588 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);
590 init_mm.start_code = PAGE_OFFSET;
591 init_mm.end_code = (unsigned long) _etext;
592 init_mm.end_data = (unsigned long) _edata;
593 init_mm.brk = klimit;
595 irqstack_early_init();
596 emergency_stack_init();
600 /* set up the bootmem stuff with available memory */
604 #ifdef CONFIG_DUMMY_CONSOLE
605 conswitchp = &dummy_con;
610 /* Use the default idle loop if the platform hasn't provided one. */
611 if (NULL == ppc_md.idle_loop) {
612 ppc_md.idle_loop = default_idle;
613 printk(KERN_INFO "Using default idle loop\n");
617 ppc64_boot_msg(0x15, "Setup Done");
621 /* ToDo: do something useful if ppc_md is not yet setup. */
622 #define PPC64_LINUX_FUNCTION 0x0f000000
623 #define PPC64_IPL_MESSAGE 0xc0000000
624 #define PPC64_TERM_MESSAGE 0xb0000000
626 static void ppc64_do_msg(unsigned int src, const char *msg)
628 if (ppc_md.progress) {
631 sprintf(buf, "%08X\n", src);
632 ppc_md.progress(buf, 0);
633 snprintf(buf, 128, "%s", msg);
634 ppc_md.progress(buf, 0);
638 /* Print a boot progress message. */
639 void ppc64_boot_msg(unsigned int src, const char *msg)
641 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
642 printk("[boot]%04x %s\n", src, msg);
645 /* Print a termination message (print only -- does not stop the kernel) */
646 void ppc64_terminate_msg(unsigned int src, const char *msg)
648 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
649 printk("[terminate]%04x %s\n", src, msg);
652 #ifndef CONFIG_PPC_ISERIES
654 * This function can be used by platforms to "find" legacy serial ports.
655 * It works for "serial" nodes under an "isa" node, and will try to
656 * respect the "ibm,aix-loc" property if any. It works with up to 8
660 #define MAX_LEGACY_SERIAL_PORTS 8
661 static struct plat_serial8250_port serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
662 static unsigned int old_serial_count;
664 void __init generic_find_legacy_serial_ports(u64 *physport,
665 unsigned int *default_speed)
667 struct device_node *np;
670 struct isa_reg_property {
675 struct pci_reg_property {
676 struct pci_address addr;
681 DBG(" -> generic_find_legacy_serial_port()\n");
687 np = of_find_node_by_path("/");
691 /* First fill our array */
692 for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
693 struct device_node *isa, *pci;
694 struct isa_reg_property *reg;
695 unsigned long phys_size, addr_size, io_base;
697 u32 *interrupts, *clk, *spd;
699 int index, rlen, rentsize;
701 /* Ok, first check if it's under an "isa" parent */
702 isa = of_get_parent(np);
703 if (!isa || strcmp(isa->name, "isa")) {
704 DBG("%s: no isa parent found\n", np->full_name);
708 /* Now look for an "ibm,aix-loc" property that gives us ordering
711 typep = (char *)get_property(np, "ibm,aix-loc", NULL);
713 /* Get the ISA port number */
714 reg = (struct isa_reg_property *)get_property(np, "reg", NULL);
717 /* We assume the interrupt number isn't translated ... */
718 interrupts = (u32 *)get_property(np, "interrupts", NULL);
719 /* get clock freq. if present */
720 clk = (u32 *)get_property(np, "clock-frequency", NULL);
721 /* get default speed if present */
722 spd = (u32 *)get_property(np, "current-speed", NULL);
723 /* Default to locate at end of array */
724 index = old_serial_count; /* end of the array by default */
726 /* If we have a location index, then use it */
727 if (typep && *typep == 'S') {
728 index = simple_strtol(typep+1, NULL, 0) - 1;
729 /* if index is out of range, use end of array instead */
730 if (index >= MAX_LEGACY_SERIAL_PORTS)
731 index = old_serial_count;
732 /* if our index is still out of range, that mean that
733 * array is full, we could scan for a free slot but that
734 * make little sense to bother, just skip the port
736 if (index >= MAX_LEGACY_SERIAL_PORTS)
738 if (index >= old_serial_count)
739 old_serial_count = index + 1;
740 /* Check if there is a port who already claimed our slot */
741 if (serial_ports[index].iobase != 0) {
742 /* if we still have some room, move it, else override */
743 if (old_serial_count < MAX_LEGACY_SERIAL_PORTS) {
744 DBG("Moved legacy port %d -> %d\n", index,
746 serial_ports[old_serial_count++] =
749 DBG("Replacing legacy port %d\n", index);
753 if (index >= MAX_LEGACY_SERIAL_PORTS)
755 if (index >= old_serial_count)
756 old_serial_count = index + 1;
758 /* Now fill the entry */
759 memset(&serial_ports[index], 0, sizeof(struct plat_serial8250_port));
760 serial_ports[index].uartclk = clk ? *clk : BASE_BAUD * 16;
761 serial_ports[index].iobase = reg->address;
762 serial_ports[index].irq = interrupts ? interrupts[0] : 0;
763 serial_ports[index].flags = ASYNC_BOOT_AUTOCONF;
765 DBG("Added legacy port, index: %d, port: %x, irq: %d, clk: %d\n",
767 serial_ports[index].iobase,
768 serial_ports[index].irq,
769 serial_ports[index].uartclk);
771 /* Get phys address of IO reg for port 1 */
775 pci = of_get_parent(isa);
777 DBG("%s: no pci parent found\n", np->full_name);
781 rangesp = (u32 *)get_property(pci, "ranges", &rlen);
782 if (rangesp == NULL) {
788 /* we need the #size-cells of the PCI bridge node itself */
790 sizeprop = (u32 *)get_property(pci, "#size-cells", NULL);
791 if (sizeprop != NULL)
792 phys_size = *sizeprop;
793 /* we need the parent #addr-cells */
794 addr_size = prom_n_addr_cells(pci);
795 rentsize = 3 + addr_size + phys_size;
797 for (;rlen >= rentsize; rlen -= rentsize,rangesp += rentsize) {
798 if (((rangesp[0] >> 24) & 0x3) != 1)
799 continue; /* not IO space */
800 io_base = rangesp[3];
802 io_base = (io_base << 32) | rangesp[4];
805 *physport = io_base + reg->address;
806 if (default_speed && spd)
807 *default_speed = *spd;
814 DBG(" <- generic_find_legacy_serial_port()\n");
817 static struct platform_device serial_device = {
818 .name = "serial8250",
819 .id = PLAT8250_DEV_PLATFORM,
821 .platform_data = serial_ports,
825 static int __init serial_dev_init(void)
827 return platform_device_register(&serial_device);
829 arch_initcall(serial_dev_init);
831 #endif /* CONFIG_PPC_ISERIES */
833 int check_legacy_ioport(unsigned long base_port)
835 if (ppc_md.check_legacy_ioport == NULL)
837 return ppc_md.check_legacy_ioport(base_port);
839 EXPORT_SYMBOL(check_legacy_ioport);