2 * Procedures for interfacing to Open Firmware.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/proc_fs.h>
27 #include <linux/stringify.h>
28 #include <linux/delay.h>
29 #include <linux/initrd.h>
30 #include <linux/bitops.h>
34 #include <asm/processor.h>
39 #include <asm/pgtable.h>
41 #include <asm/iommu.h>
42 #include <asm/btext.h>
43 #include <asm/sections.h>
44 #include <asm/machdep.h>
47 #include <linux/linux_logo.h>
50 * Eventually bump that one up
52 #define DEVTREE_CHUNK_SIZE 0x100000
55 * This is the size of the local memory reserve map that gets copied
56 * into the boot params passed to the kernel. That size is totally
57 * flexible as the kernel just reads the list until it encounters an
58 * entry with size 0, so it can be changed without breaking binary
61 #define MEM_RESERVE_MAP_SIZE 8
64 * prom_init() is called very early on, before the kernel text
65 * and data have been mapped to KERNELBASE. At this point the code
66 * is running at whatever address it has been loaded at.
67 * On ppc32 we compile with -mrelocatable, which means that references
68 * to extern and static variables get relocated automatically.
69 * ppc64 objects are always relocatable, we just need to relocate the
72 * Because OF may have mapped I/O devices into the area starting at
73 * KERNELBASE, particularly on CHRP machines, we can't safely call
74 * OF once the kernel has been mapped to KERNELBASE. Therefore all
75 * OF calls must be done within prom_init().
77 * ADDR is used in calls to call_prom. The 4th and following
78 * arguments to call_prom should be 32-bit values.
79 * On ppc64, 64 bit values are truncated to 32 bits (and
80 * fortunately don't get interpreted as two arguments).
82 #define ADDR(x) (u32)(unsigned long)(x)
85 #define OF_WORKAROUNDS 0
87 #define OF_WORKAROUNDS of_workarounds
91 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
92 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
94 #define PROM_BUG() do { \
95 prom_printf("kernel BUG at %s line 0x%x!\n", \
96 __FILE__, __LINE__); \
97 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
101 #define prom_debug(x...) prom_printf(x)
103 #define prom_debug(x...)
107 typedef u32 prom_arg_t;
125 struct mem_map_entry {
130 typedef __be32 cell_t;
132 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
133 unsigned long r6, unsigned long r7, unsigned long r8,
137 extern int enter_prom(struct prom_args *args, unsigned long entry);
139 static inline int enter_prom(struct prom_args *args, unsigned long entry)
141 return ((int (*)(struct prom_args *))entry)(args);
145 extern void copy_and_flush(unsigned long dest, unsigned long src,
146 unsigned long size, unsigned long offset);
149 static struct prom_t __initdata prom;
151 static unsigned long prom_entry __initdata;
153 #define PROM_SCRATCH_SIZE 256
155 static char __initdata of_stdout_device[256];
156 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
158 static unsigned long __initdata dt_header_start;
159 static unsigned long __initdata dt_struct_start, dt_struct_end;
160 static unsigned long __initdata dt_string_start, dt_string_end;
162 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
165 static int __initdata prom_iommu_force_on;
166 static int __initdata prom_iommu_off;
167 static unsigned long __initdata prom_tce_alloc_start;
168 static unsigned long __initdata prom_tce_alloc_end;
171 /* Platforms codes are now obsolete in the kernel. Now only used within this
172 * file and ultimately gone too. Feel free to change them if you need, they
173 * are not shared with anything outside of this file anymore
175 #define PLATFORM_PSERIES 0x0100
176 #define PLATFORM_PSERIES_LPAR 0x0101
177 #define PLATFORM_LPAR 0x0001
178 #define PLATFORM_POWERMAC 0x0400
179 #define PLATFORM_GENERIC 0x0500
180 #define PLATFORM_OPAL 0x0600
182 static int __initdata of_platform;
184 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
186 static unsigned long __initdata prom_memory_limit;
188 static unsigned long __initdata alloc_top;
189 static unsigned long __initdata alloc_top_high;
190 static unsigned long __initdata alloc_bottom;
191 static unsigned long __initdata rmo_top;
192 static unsigned long __initdata ram_top;
194 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
195 static int __initdata mem_reserve_cnt;
197 static cell_t __initdata regbuf[1024];
199 static bool rtas_has_query_cpu_stopped;
203 * Error results ... some OF calls will return "-1" on error, some
204 * will return 0, some will return either. To simplify, here are
205 * macros to use with any ihandle or phandle return value to check if
209 #define PROM_ERROR (-1u)
210 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
211 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
214 /* This is the one and *ONLY* place where we actually call open
218 static int __init call_prom(const char *service, int nargs, int nret, ...)
221 struct prom_args args;
224 args.service = cpu_to_be32(ADDR(service));
225 args.nargs = cpu_to_be32(nargs);
226 args.nret = cpu_to_be32(nret);
228 va_start(list, nret);
229 for (i = 0; i < nargs; i++)
230 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
233 for (i = 0; i < nret; i++)
234 args.args[nargs+i] = 0;
236 if (enter_prom(&args, prom_entry) < 0)
239 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
242 static int __init call_prom_ret(const char *service, int nargs, int nret,
243 prom_arg_t *rets, ...)
246 struct prom_args args;
249 args.service = cpu_to_be32(ADDR(service));
250 args.nargs = cpu_to_be32(nargs);
251 args.nret = cpu_to_be32(nret);
253 va_start(list, rets);
254 for (i = 0; i < nargs; i++)
255 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
258 for (i = 0; i < nret; i++)
259 args.args[nargs+i] = 0;
261 if (enter_prom(&args, prom_entry) < 0)
265 for (i = 1; i < nret; ++i)
266 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
268 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
272 static void __init prom_print(const char *msg)
276 if (prom.stdout == 0)
279 for (p = msg; *p != 0; p = q) {
280 for (q = p; *q != 0 && *q != '\n'; ++q)
283 call_prom("write", 3, 1, prom.stdout, p, q - p);
287 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
292 static void __init prom_print_hex(unsigned long val)
294 int i, nibbles = sizeof(val)*2;
295 char buf[sizeof(val)*2+1];
297 for (i = nibbles-1; i >= 0; i--) {
298 buf[i] = (val & 0xf) + '0';
300 buf[i] += ('a'-'0'-10);
304 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
307 /* max number of decimal digits in an unsigned long */
309 static void __init prom_print_dec(unsigned long val)
312 char buf[UL_DIGITS+1];
314 for (i = UL_DIGITS-1; i >= 0; i--) {
315 buf[i] = (val % 10) + '0';
320 /* shift stuff down */
321 size = UL_DIGITS - i;
322 call_prom("write", 3, 1, prom.stdout, buf+i, size);
325 static void __init prom_printf(const char *format, ...)
327 const char *p, *q, *s;
332 va_start(args, format);
333 for (p = format; *p != 0; p = q) {
334 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
337 call_prom("write", 3, 1, prom.stdout, p, q - p);
342 call_prom("write", 3, 1, prom.stdout,
352 s = va_arg(args, const char *);
357 v = va_arg(args, unsigned long);
362 vs = va_arg(args, int);
373 else if (*q == 'x') {
375 v = va_arg(args, unsigned long);
377 } else if (*q == 'u') { /* '%lu' */
379 v = va_arg(args, unsigned long);
381 } else if (*q == 'd') { /* %ld */
383 vs = va_arg(args, long);
396 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
400 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
402 * Old OF requires we claim physical and virtual separately
403 * and then map explicitly (assuming virtual mode)
408 ret = call_prom_ret("call-method", 5, 2, &result,
409 ADDR("claim"), prom.memory,
411 if (ret != 0 || result == -1)
413 ret = call_prom_ret("call-method", 5, 2, &result,
414 ADDR("claim"), prom.mmumap,
417 call_prom("call-method", 4, 1, ADDR("release"),
418 prom.memory, size, virt);
421 /* the 0x12 is M (coherence) + PP == read/write */
422 call_prom("call-method", 6, 1,
423 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
426 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
430 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
433 /* Do not call exit because it clears the screen on pmac
434 * it also causes some sort of double-fault on early pmacs */
435 if (of_platform == PLATFORM_POWERMAC)
438 /* ToDo: should put up an SRC here on pSeries */
439 call_prom("exit", 0, 0);
441 for (;;) /* should never get here */
446 static int __init prom_next_node(phandle *nodep)
450 if ((node = *nodep) != 0
451 && (*nodep = call_prom("child", 1, 1, node)) != 0)
453 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
456 if ((node = call_prom("parent", 1, 1, node)) == 0)
458 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
463 static int inline prom_getprop(phandle node, const char *pname,
464 void *value, size_t valuelen)
466 return call_prom("getprop", 4, 1, node, ADDR(pname),
467 (u32)(unsigned long) value, (u32) valuelen);
470 static int inline prom_getproplen(phandle node, const char *pname)
472 return call_prom("getproplen", 2, 1, node, ADDR(pname));
475 static void add_string(char **str, const char *q)
485 static char *tohex(unsigned int x)
487 static char digits[] = "0123456789abcdef";
488 static char result[9];
495 result[i] = digits[x & 0xf];
497 } while (x != 0 && i > 0);
501 static int __init prom_setprop(phandle node, const char *nodename,
502 const char *pname, void *value, size_t valuelen)
506 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
507 return call_prom("setprop", 4, 1, node, ADDR(pname),
508 (u32)(unsigned long) value, (u32) valuelen);
510 /* gah... setprop doesn't work on longtrail, have to use interpret */
512 add_string(&p, "dev");
513 add_string(&p, nodename);
514 add_string(&p, tohex((u32)(unsigned long) value));
515 add_string(&p, tohex(valuelen));
516 add_string(&p, tohex(ADDR(pname)));
517 add_string(&p, tohex(strlen(pname)));
518 add_string(&p, "property");
520 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
523 /* We can't use the standard versions because of relocation headaches. */
524 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
525 || ('a' <= (c) && (c) <= 'f') \
526 || ('A' <= (c) && (c) <= 'F'))
528 #define isdigit(c) ('0' <= (c) && (c) <= '9')
529 #define islower(c) ('a' <= (c) && (c) <= 'z')
530 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
532 static unsigned long prom_strtoul(const char *cp, const char **endp)
534 unsigned long result = 0, base = 10, value;
539 if (toupper(*cp) == 'X') {
545 while (isxdigit(*cp) &&
546 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
547 result = result * base + value;
557 static unsigned long prom_memparse(const char *ptr, const char **retptr)
559 unsigned long ret = prom_strtoul(ptr, retptr);
563 * We can't use a switch here because GCC *may* generate a
564 * jump table which won't work, because we're not running at
565 * the address we're linked at.
567 if ('G' == **retptr || 'g' == **retptr)
570 if ('M' == **retptr || 'm' == **retptr)
573 if ('K' == **retptr || 'k' == **retptr)
585 * Early parsing of the command line passed to the kernel, used for
586 * "mem=x" and the options that affect the iommu
588 static void __init early_cmdline_parse(void)
595 prom_cmd_line[0] = 0;
597 if ((long)prom.chosen > 0)
598 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
599 #ifdef CONFIG_CMDLINE
600 if (l <= 0 || p[0] == '\0') /* dbl check */
601 strlcpy(prom_cmd_line,
602 CONFIG_CMDLINE, sizeof(prom_cmd_line));
603 #endif /* CONFIG_CMDLINE */
604 prom_printf("command line: %s\n", prom_cmd_line);
607 opt = strstr(prom_cmd_line, "iommu=");
609 prom_printf("iommu opt is: %s\n", opt);
611 while (*opt && *opt == ' ')
613 if (!strncmp(opt, "off", 3))
615 else if (!strncmp(opt, "force", 5))
616 prom_iommu_force_on = 1;
619 opt = strstr(prom_cmd_line, "mem=");
622 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
624 /* Align to 16 MB == size of ppc64 large page */
625 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
630 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
632 * The architecture vector has an array of PVR mask/value pairs,
633 * followed by # option vectors - 1, followed by the option vectors.
635 * See prom.h for the definition of the bits specified in the
636 * architecture vector.
638 * Because the description vector contains a mix of byte and word
639 * values, we declare it as an unsigned char array, and use this
640 * macro to put word values in.
642 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
643 ((x) >> 8) & 0xff, (x) & 0xff
645 unsigned char ibm_architecture_vec[] = {
646 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
647 W(0xffff0000), W(0x003e0000), /* POWER6 */
648 W(0xffff0000), W(0x003f0000), /* POWER7 */
649 W(0xffff0000), W(0x004b0000), /* POWER8E */
650 W(0xffff0000), W(0x004d0000), /* POWER8 */
651 W(0xffffffff), W(0x0f000004), /* all 2.07-compliant */
652 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
653 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
654 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
655 6 - 1, /* 6 option vectors */
657 /* option vector 1: processor architectures supported */
659 0, /* don't ignore, don't halt */
660 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
661 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
663 /* option vector 2: Open Firmware options supported */
667 W(0xffffffff), /* real_base */
668 W(0xffffffff), /* real_size */
669 W(0xffffffff), /* virt_base */
670 W(0xffffffff), /* virt_size */
671 W(0xffffffff), /* load_base */
672 W(256), /* 256MB min RMA */
673 W(0xffffffff), /* full client load */
674 0, /* min RMA percentage of total RAM */
675 48, /* max log_2(hash table size) */
677 /* option vector 3: processor options supported */
679 0, /* don't ignore, don't halt */
680 OV3_FP | OV3_VMX | OV3_DFP,
682 /* option vector 4: IBM PAPR implementation */
685 OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
687 /* option vector 5: PAPR/OF options */
689 0, /* don't ignore, don't halt */
690 OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
691 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
692 #ifdef CONFIG_PCI_MSI
693 /* PCIe/MSI support. Without MSI full PCIe is not supported */
699 #ifdef CONFIG_PPC_SMLPAR
700 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
704 OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
708 /* WARNING: The offset of the "number of cores" field below
709 * must match by the macro below. Update the definition if
710 * the structure layout changes.
712 #define IBM_ARCH_VEC_NRCORES_OFFSET 125
713 W(NR_CPUS), /* number of cores supported */
718 OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) |
719 OV5_FEAT(OV5_PFO_HW_842),
720 OV5_FEAT(OV5_SUB_PROCESSORS),
721 /* option vector 6: IBM PAPR hints */
729 /* Old method - ELF header with PT_NOTE sections only works on BE */
730 #ifdef __BIG_ENDIAN__
731 static struct fake_elf {
738 char name[8]; /* "PowerPC" */
752 char name[24]; /* "IBM,RPA-Client-Config" */
766 .e_ident = { 0x7f, 'E', 'L', 'F',
767 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
768 .e_type = ET_EXEC, /* yeah right */
770 .e_version = EV_CURRENT,
771 .e_phoff = offsetof(struct fake_elf, phdr),
772 .e_phentsize = sizeof(Elf32_Phdr),
778 .p_offset = offsetof(struct fake_elf, chrpnote),
779 .p_filesz = sizeof(struct chrpnote)
782 .p_offset = offsetof(struct fake_elf, rpanote),
783 .p_filesz = sizeof(struct rpanote)
787 .namesz = sizeof("PowerPC"),
788 .descsz = sizeof(struct chrpdesc),
792 .real_mode = ~0U, /* ~0 means "don't care" */
801 .namesz = sizeof("IBM,RPA-Client-Config"),
802 .descsz = sizeof(struct rpadesc),
804 .name = "IBM,RPA-Client-Config",
807 .min_rmo_size = 64, /* in megabytes */
808 .min_rmo_percent = 0,
809 .max_pft_size = 48, /* 2^48 bytes max PFT size */
816 #endif /* __BIG_ENDIAN__ */
818 static int __init prom_count_smt_threads(void)
824 /* Pick up th first CPU node we can find */
825 for (node = 0; prom_next_node(&node); ) {
827 prom_getprop(node, "device_type", type, sizeof(type));
829 if (strcmp(type, "cpu"))
832 * There is an entry for each smt thread, each entry being
833 * 4 bytes long. All cpus should have the same number of
834 * smt threads, so return after finding the first.
836 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
837 if (plen == PROM_ERROR)
840 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
843 if (plen < 1 || plen > 64) {
844 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
845 (unsigned long)plen);
850 prom_debug("No threads found, assuming 1 per core\n");
857 static void __init prom_send_capabilities(void)
862 unsigned char *ptcores;
864 root = call_prom("open", 1, 1, ADDR("/"));
866 /* We need to tell the FW about the number of cores we support.
868 * To do that, we count the number of threads on the first core
869 * (we assume this is the same for all cores) and use it to
873 /* The core value may start at an odd address. If such a word
874 * access is made at a cache line boundary, this leads to an
875 * exception which may not be handled at this time.
876 * Forcing a per byte access to avoid exception.
878 ptcores = &ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET];
880 cores |= ptcores[0] << 24;
881 cores |= ptcores[1] << 16;
882 cores |= ptcores[2] << 8;
884 if (cores != NR_CPUS) {
885 prom_printf("WARNING ! "
886 "ibm_architecture_vec structure inconsistent: %lu!\n",
889 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
890 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
892 ptcores[0] = (cores >> 24) & 0xff;
893 ptcores[1] = (cores >> 16) & 0xff;
894 ptcores[2] = (cores >> 8) & 0xff;
895 ptcores[3] = cores & 0xff;
898 /* try calling the ibm,client-architecture-support method */
899 prom_printf("Calling ibm,client-architecture-support...");
900 if (call_prom_ret("call-method", 3, 2, &ret,
901 ADDR("ibm,client-architecture-support"),
903 ADDR(ibm_architecture_vec)) == 0) {
904 /* the call exists... */
906 prom_printf("\nWARNING: ibm,client-architecture"
907 "-support call FAILED!\n");
908 call_prom("close", 1, 0, root);
909 prom_printf(" done\n");
912 call_prom("close", 1, 0, root);
913 prom_printf(" not implemented\n");
916 #ifdef __BIG_ENDIAN__
920 /* no ibm,client-architecture-support call, try the old way */
921 elfloader = call_prom("open", 1, 1,
922 ADDR("/packages/elf-loader"));
923 if (elfloader == 0) {
924 prom_printf("couldn't open /packages/elf-loader\n");
927 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
928 elfloader, ADDR(&fake_elf));
929 call_prom("close", 1, 0, elfloader);
931 #endif /* __BIG_ENDIAN__ */
933 #endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
936 * Memory allocation strategy... our layout is normally:
938 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
939 * rare cases, initrd might end up being before the kernel though.
940 * We assume this won't override the final kernel at 0, we have no
941 * provision to handle that in this version, but it should hopefully
944 * alloc_top is set to the top of RMO, eventually shrink down if the
947 * alloc_bottom is set to the top of kernel/initrd
949 * from there, allocations are done this way : rtas is allocated
950 * topmost, and the device-tree is allocated from the bottom. We try
951 * to grow the device-tree allocation as we progress. If we can't,
952 * then we fail, we don't currently have a facility to restart
953 * elsewhere, but that shouldn't be necessary.
955 * Note that calls to reserve_mem have to be done explicitly, memory
956 * allocated with either alloc_up or alloc_down isn't automatically
962 * Allocates memory in the RMO upward from the kernel/initrd
964 * When align is 0, this is a special case, it means to allocate in place
965 * at the current location of alloc_bottom or fail (that is basically
966 * extending the previous allocation). Used for the device-tree flattening
968 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
970 unsigned long base = alloc_bottom;
971 unsigned long addr = 0;
974 base = _ALIGN_UP(base, align);
975 prom_debug("alloc_up(%x, %x)\n", size, align);
977 prom_panic("alloc_up() called with mem not initialized\n");
980 base = _ALIGN_UP(alloc_bottom, align);
984 for(; (base + size) <= alloc_top;
985 base = _ALIGN_UP(base + 0x100000, align)) {
986 prom_debug(" trying: 0x%x\n\r", base);
987 addr = (unsigned long)prom_claim(base, size, 0);
988 if (addr != PROM_ERROR && addr != 0)
996 alloc_bottom = addr + size;
998 prom_debug(" -> %x\n", addr);
999 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1000 prom_debug(" alloc_top : %x\n", alloc_top);
1001 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1002 prom_debug(" rmo_top : %x\n", rmo_top);
1003 prom_debug(" ram_top : %x\n", ram_top);
1009 * Allocates memory downward, either from top of RMO, or if highmem
1010 * is set, from the top of RAM. Note that this one doesn't handle
1011 * failures. It does claim memory if highmem is not set.
1013 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1016 unsigned long base, addr = 0;
1018 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1019 highmem ? "(high)" : "(low)");
1021 prom_panic("alloc_down() called with mem not initialized\n");
1024 /* Carve out storage for the TCE table. */
1025 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1026 if (addr <= alloc_bottom)
1028 /* Will we bump into the RMO ? If yes, check out that we
1029 * didn't overlap existing allocations there, if we did,
1030 * we are dead, we must be the first in town !
1032 if (addr < rmo_top) {
1033 /* Good, we are first */
1034 if (alloc_top == rmo_top)
1035 alloc_top = rmo_top = addr;
1039 alloc_top_high = addr;
1043 base = _ALIGN_DOWN(alloc_top - size, align);
1044 for (; base > alloc_bottom;
1045 base = _ALIGN_DOWN(base - 0x100000, align)) {
1046 prom_debug(" trying: 0x%x\n\r", base);
1047 addr = (unsigned long)prom_claim(base, size, 0);
1048 if (addr != PROM_ERROR && addr != 0)
1057 prom_debug(" -> %x\n", addr);
1058 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1059 prom_debug(" alloc_top : %x\n", alloc_top);
1060 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1061 prom_debug(" rmo_top : %x\n", rmo_top);
1062 prom_debug(" ram_top : %x\n", ram_top);
1068 * Parse a "reg" cell
1070 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1073 unsigned long r = 0;
1075 /* Ignore more than 2 cells */
1076 while (s > sizeof(unsigned long) / 4) {
1080 r = be32_to_cpu(*p++);
1084 r |= be32_to_cpu(*(p++));
1092 * Very dumb function for adding to the memory reserve list, but
1093 * we don't need anything smarter at this point
1095 * XXX Eventually check for collisions. They should NEVER happen.
1096 * If problems seem to show up, it would be a good start to track
1099 static void __init reserve_mem(u64 base, u64 size)
1101 u64 top = base + size;
1102 unsigned long cnt = mem_reserve_cnt;
1107 /* We need to always keep one empty entry so that we
1108 * have our terminator with "size" set to 0 since we are
1109 * dumb and just copy this entire array to the boot params
1111 base = _ALIGN_DOWN(base, PAGE_SIZE);
1112 top = _ALIGN_UP(top, PAGE_SIZE);
1115 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1116 prom_panic("Memory reserve map exhausted !\n");
1117 mem_reserve_map[cnt].base = cpu_to_be64(base);
1118 mem_reserve_map[cnt].size = cpu_to_be64(size);
1119 mem_reserve_cnt = cnt + 1;
1123 * Initialize memory allocation mechanism, parse "memory" nodes and
1124 * obtain that way the top of memory and RMO to setup out local allocator
1126 static void __init prom_init_mem(void)
1129 char *path, type[64];
1136 * We iterate the memory nodes to find
1137 * 1) top of RMO (first node)
1140 val = cpu_to_be32(2);
1141 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1142 rac = be32_to_cpu(val);
1143 val = cpu_to_be32(1);
1144 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1145 rsc = be32_to_cpu(val);
1146 prom_debug("root_addr_cells: %x\n", rac);
1147 prom_debug("root_size_cells: %x\n", rsc);
1149 prom_debug("scanning memory:\n");
1150 path = prom_scratch;
1152 for (node = 0; prom_next_node(&node); ) {
1154 prom_getprop(node, "device_type", type, sizeof(type));
1158 * CHRP Longtrail machines have no device_type
1159 * on the memory node, so check the name instead...
1161 prom_getprop(node, "name", type, sizeof(type));
1163 if (strcmp(type, "memory"))
1166 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1167 if (plen > sizeof(regbuf)) {
1168 prom_printf("memory node too large for buffer !\n");
1169 plen = sizeof(regbuf);
1172 endp = p + (plen / sizeof(cell_t));
1175 memset(path, 0, PROM_SCRATCH_SIZE);
1176 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1177 prom_debug(" node %s :\n", path);
1178 #endif /* DEBUG_PROM */
1180 while ((endp - p) >= (rac + rsc)) {
1181 unsigned long base, size;
1183 base = prom_next_cell(rac, &p);
1184 size = prom_next_cell(rsc, &p);
1188 prom_debug(" %x %x\n", base, size);
1189 if (base == 0 && (of_platform & PLATFORM_LPAR))
1191 if ((base + size) > ram_top)
1192 ram_top = base + size;
1196 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1199 * If prom_memory_limit is set we reduce the upper limits *except* for
1200 * alloc_top_high. This must be the real top of RAM so we can put
1204 alloc_top_high = ram_top;
1206 if (prom_memory_limit) {
1207 if (prom_memory_limit <= alloc_bottom) {
1208 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1210 prom_memory_limit = 0;
1211 } else if (prom_memory_limit >= ram_top) {
1212 prom_printf("Ignoring mem=%x >= ram_top.\n",
1214 prom_memory_limit = 0;
1216 ram_top = prom_memory_limit;
1217 rmo_top = min(rmo_top, prom_memory_limit);
1222 * Setup our top alloc point, that is top of RMO or top of
1223 * segment 0 when running non-LPAR.
1224 * Some RS64 machines have buggy firmware where claims up at
1225 * 1GB fail. Cap at 768MB as a workaround.
1226 * Since 768MB is plenty of room, and we need to cap to something
1227 * reasonable on 32-bit, cap at 768MB on all machines.
1231 rmo_top = min(0x30000000ul, rmo_top);
1232 alloc_top = rmo_top;
1233 alloc_top_high = ram_top;
1236 * Check if we have an initrd after the kernel but still inside
1237 * the RMO. If we do move our bottom point to after it.
1239 if (prom_initrd_start &&
1240 prom_initrd_start < rmo_top &&
1241 prom_initrd_end > alloc_bottom)
1242 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1244 prom_printf("memory layout at init:\n");
1245 prom_printf(" memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1246 prom_printf(" alloc_bottom : %x\n", alloc_bottom);
1247 prom_printf(" alloc_top : %x\n", alloc_top);
1248 prom_printf(" alloc_top_hi : %x\n", alloc_top_high);
1249 prom_printf(" rmo_top : %x\n", rmo_top);
1250 prom_printf(" ram_top : %x\n", ram_top);
1253 static void __init prom_close_stdin(void)
1258 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1259 stdin = be32_to_cpu(val);
1260 call_prom("close", 1, 0, stdin);
1264 #ifdef CONFIG_PPC_POWERNV
1266 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1267 static u64 __initdata prom_opal_base;
1268 static u64 __initdata prom_opal_entry;
1272 * Allocate room for and instantiate OPAL
1274 static void __init prom_instantiate_opal(void)
1279 u64 size = 0, align = 0x10000;
1283 prom_debug("prom_instantiate_opal: start...\n");
1285 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1286 prom_debug("opal_node: %x\n", opal_node);
1287 if (!PHANDLE_VALID(opal_node))
1291 prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
1292 size = be64_to_cpu(val64);
1296 prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
1297 align = be64_to_cpu(val64);
1299 base = alloc_down(size, align, 0);
1301 prom_printf("OPAL allocation failed !\n");
1305 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1306 if (!IHANDLE_VALID(opal_inst)) {
1307 prom_printf("opening opal package failed (%x)\n", opal_inst);
1311 prom_printf("instantiating opal at 0x%x...", base);
1313 if (call_prom_ret("call-method", 4, 3, rets,
1314 ADDR("load-opal-runtime"),
1316 base >> 32, base & 0xffffffff) != 0
1317 || (rets[0] == 0 && rets[1] == 0)) {
1318 prom_printf(" failed\n");
1321 entry = (((u64)rets[0]) << 32) | rets[1];
1323 prom_printf(" done\n");
1325 reserve_mem(base, size);
1327 prom_debug("opal base = 0x%x\n", base);
1328 prom_debug("opal align = 0x%x\n", align);
1329 prom_debug("opal entry = 0x%x\n", entry);
1330 prom_debug("opal size = 0x%x\n", (long)size);
1332 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1333 &base, sizeof(base));
1334 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1335 &entry, sizeof(entry));
1337 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1338 prom_opal_base = base;
1339 prom_opal_entry = entry;
1341 prom_debug("prom_instantiate_opal: end...\n");
1344 #endif /* CONFIG_PPC_POWERNV */
1347 * Allocate room for and instantiate RTAS
1349 static void __init prom_instantiate_rtas(void)
1353 u32 base, entry = 0;
1357 prom_debug("prom_instantiate_rtas: start...\n");
1359 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1360 prom_debug("rtas_node: %x\n", rtas_node);
1361 if (!PHANDLE_VALID(rtas_node))
1365 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1366 size = be32_to_cpu(val);
1370 base = alloc_down(size, PAGE_SIZE, 0);
1372 prom_panic("Could not allocate memory for RTAS\n");
1374 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1375 if (!IHANDLE_VALID(rtas_inst)) {
1376 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1380 prom_printf("instantiating rtas at 0x%x...", base);
1382 if (call_prom_ret("call-method", 3, 2, &entry,
1383 ADDR("instantiate-rtas"),
1384 rtas_inst, base) != 0
1386 prom_printf(" failed\n");
1389 prom_printf(" done\n");
1391 reserve_mem(base, size);
1393 val = cpu_to_be32(base);
1394 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1396 val = cpu_to_be32(entry);
1397 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1400 /* Check if it supports "query-cpu-stopped-state" */
1401 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1402 &val, sizeof(val)) != PROM_ERROR)
1403 rtas_has_query_cpu_stopped = true;
1405 prom_debug("rtas base = 0x%x\n", base);
1406 prom_debug("rtas entry = 0x%x\n", entry);
1407 prom_debug("rtas size = 0x%x\n", (long)size);
1409 prom_debug("prom_instantiate_rtas: end...\n");
1414 * Allocate room for and instantiate Stored Measurement Log (SML)
1416 static void __init prom_instantiate_sml(void)
1418 phandle ibmvtpm_node;
1419 ihandle ibmvtpm_inst;
1420 u32 entry = 0, size = 0;
1423 prom_debug("prom_instantiate_sml: start...\n");
1425 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/ibm,vtpm"));
1426 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1427 if (!PHANDLE_VALID(ibmvtpm_node))
1430 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/ibm,vtpm"));
1431 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1432 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1436 if (call_prom_ret("call-method", 2, 2, &size,
1437 ADDR("sml-get-handover-size"),
1438 ibmvtpm_inst) != 0 || size == 0) {
1439 prom_printf("SML get handover size failed\n");
1443 base = alloc_down(size, PAGE_SIZE, 0);
1445 prom_panic("Could not allocate memory for sml\n");
1447 prom_printf("instantiating sml at 0x%x...", base);
1449 if (call_prom_ret("call-method", 4, 2, &entry,
1450 ADDR("sml-handover"),
1451 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1452 prom_printf("SML handover failed\n");
1455 prom_printf(" done\n");
1457 reserve_mem(base, size);
1459 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-base",
1460 &base, sizeof(base));
1461 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-size",
1462 &size, sizeof(size));
1464 prom_debug("sml base = 0x%x\n", base);
1465 prom_debug("sml size = 0x%x\n", (long)size);
1467 prom_debug("prom_instantiate_sml: end...\n");
1471 * Allocate room for and initialize TCE tables
1473 #ifdef __BIG_ENDIAN__
1474 static void __init prom_initialize_tce_table(void)
1478 char compatible[64], type[64], model[64];
1479 char *path = prom_scratch;
1481 u32 minalign, minsize;
1482 u64 tce_entry, *tce_entryp;
1483 u64 local_alloc_top, local_alloc_bottom;
1489 prom_debug("starting prom_initialize_tce_table\n");
1491 /* Cache current top of allocs so we reserve a single block */
1492 local_alloc_top = alloc_top_high;
1493 local_alloc_bottom = local_alloc_top;
1495 /* Search all nodes looking for PHBs. */
1496 for (node = 0; prom_next_node(&node); ) {
1500 prom_getprop(node, "compatible",
1501 compatible, sizeof(compatible));
1502 prom_getprop(node, "device_type", type, sizeof(type));
1503 prom_getprop(node, "model", model, sizeof(model));
1505 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1508 /* Keep the old logic intact to avoid regression. */
1509 if (compatible[0] != 0) {
1510 if ((strstr(compatible, "python") == NULL) &&
1511 (strstr(compatible, "Speedwagon") == NULL) &&
1512 (strstr(compatible, "Winnipeg") == NULL))
1514 } else if (model[0] != 0) {
1515 if ((strstr(model, "ython") == NULL) &&
1516 (strstr(model, "peedwagon") == NULL) &&
1517 (strstr(model, "innipeg") == NULL))
1521 if (prom_getprop(node, "tce-table-minalign", &minalign,
1522 sizeof(minalign)) == PROM_ERROR)
1524 if (prom_getprop(node, "tce-table-minsize", &minsize,
1525 sizeof(minsize)) == PROM_ERROR)
1526 minsize = 4UL << 20;
1529 * Even though we read what OF wants, we just set the table
1530 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1531 * By doing this, we avoid the pitfalls of trying to DMA to
1532 * MMIO space and the DMA alias hole.
1534 * On POWER4, firmware sets the TCE region by assuming
1535 * each TCE table is 8MB. Using this memory for anything
1536 * else will impact performance, so we always allocate 8MB.
1539 if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
1540 minsize = 8UL << 20;
1542 minsize = 4UL << 20;
1544 /* Align to the greater of the align or size */
1545 align = max(minalign, minsize);
1546 base = alloc_down(minsize, align, 1);
1548 prom_panic("ERROR, cannot find space for TCE table.\n");
1549 if (base < local_alloc_bottom)
1550 local_alloc_bottom = base;
1552 /* It seems OF doesn't null-terminate the path :-( */
1553 memset(path, 0, PROM_SCRATCH_SIZE);
1554 /* Call OF to setup the TCE hardware */
1555 if (call_prom("package-to-path", 3, 1, node,
1556 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1557 prom_printf("package-to-path failed\n");
1560 /* Save away the TCE table attributes for later use. */
1561 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1562 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1564 prom_debug("TCE table: %s\n", path);
1565 prom_debug("\tnode = 0x%x\n", node);
1566 prom_debug("\tbase = 0x%x\n", base);
1567 prom_debug("\tsize = 0x%x\n", minsize);
1569 /* Initialize the table to have a one-to-one mapping
1570 * over the allocated size.
1572 tce_entryp = (u64 *)base;
1573 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1574 tce_entry = (i << PAGE_SHIFT);
1576 *tce_entryp = tce_entry;
1579 prom_printf("opening PHB %s", path);
1580 phb_node = call_prom("open", 1, 1, path);
1582 prom_printf("... failed\n");
1584 prom_printf("... done\n");
1586 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1587 phb_node, -1, minsize,
1588 (u32) base, (u32) (base >> 32));
1589 call_prom("close", 1, 0, phb_node);
1592 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1594 /* These are only really needed if there is a memory limit in
1595 * effect, but we don't know so export them always. */
1596 prom_tce_alloc_start = local_alloc_bottom;
1597 prom_tce_alloc_end = local_alloc_top;
1599 /* Flag the first invalid entry */
1600 prom_debug("ending prom_initialize_tce_table\n");
1602 #endif /* __BIG_ENDIAN__ */
1603 #endif /* CONFIG_PPC64 */
1606 * With CHRP SMP we need to use the OF to start the other processors.
1607 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1608 * so we have to put the processors into a holding pattern controlled
1609 * by the kernel (not OF) before we destroy the OF.
1611 * This uses a chunk of low memory, puts some holding pattern
1612 * code there and sends the other processors off to there until
1613 * smp_boot_cpus tells them to do something. The holding pattern
1614 * checks that address until its cpu # is there, when it is that
1615 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1616 * of setting those values.
1618 * We also use physical address 0x4 here to tell when a cpu
1619 * is in its holding pattern code.
1624 * We want to reference the copy of __secondary_hold_* in the
1625 * 0 - 0x100 address range
1627 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1629 static void __init prom_hold_cpus(void)
1634 unsigned long *spinloop
1635 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1636 unsigned long *acknowledge
1637 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1638 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1641 * On pseries, if RTAS supports "query-cpu-stopped-state",
1642 * we skip this stage, the CPUs will be started by the
1643 * kernel using RTAS.
1645 if ((of_platform == PLATFORM_PSERIES ||
1646 of_platform == PLATFORM_PSERIES_LPAR) &&
1647 rtas_has_query_cpu_stopped) {
1648 prom_printf("prom_hold_cpus: skipped\n");
1652 prom_debug("prom_hold_cpus: start...\n");
1653 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1654 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1655 prom_debug(" 1) acknowledge = 0x%x\n",
1656 (unsigned long)acknowledge);
1657 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1658 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1660 /* Set the common spinloop variable, so all of the secondary cpus
1661 * will block when they are awakened from their OF spinloop.
1662 * This must occur for both SMP and non SMP kernels, since OF will
1663 * be trashed when we move the kernel.
1668 for (node = 0; prom_next_node(&node); ) {
1669 unsigned int cpu_no;
1673 prom_getprop(node, "device_type", type, sizeof(type));
1674 if (strcmp(type, "cpu") != 0)
1677 /* Skip non-configured cpus. */
1678 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1679 if (strcmp(type, "okay") != 0)
1682 reg = cpu_to_be32(-1); /* make sparse happy */
1683 prom_getprop(node, "reg", ®, sizeof(reg));
1684 cpu_no = be32_to_cpu(reg);
1686 prom_debug("cpu hw idx = %lu\n", cpu_no);
1688 /* Init the acknowledge var which will be reset by
1689 * the secondary cpu when it awakens from its OF
1692 *acknowledge = (unsigned long)-1;
1694 if (cpu_no != prom.cpu) {
1695 /* Primary Thread of non-boot cpu or any thread */
1696 prom_printf("starting cpu hw idx %lu... ", cpu_no);
1697 call_prom("start-cpu", 3, 0, node,
1698 secondary_hold, cpu_no);
1700 for (i = 0; (i < 100000000) &&
1701 (*acknowledge == ((unsigned long)-1)); i++ )
1704 if (*acknowledge == cpu_no)
1705 prom_printf("done\n");
1707 prom_printf("failed: %x\n", *acknowledge);
1711 prom_printf("boot cpu hw idx %lu\n", cpu_no);
1712 #endif /* CONFIG_SMP */
1715 prom_debug("prom_hold_cpus: end...\n");
1719 static void __init prom_init_client_services(unsigned long pp)
1721 /* Get a handle to the prom entry point before anything else */
1724 /* get a handle for the stdout device */
1725 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1726 if (!PHANDLE_VALID(prom.chosen))
1727 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1729 /* get device tree root */
1730 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
1731 if (!PHANDLE_VALID(prom.root))
1732 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1739 * For really old powermacs, we need to map things we claim.
1740 * For that, we need the ihandle of the mmu.
1741 * Also, on the longtrail, we need to work around other bugs.
1743 static void __init prom_find_mmu(void)
1748 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1749 if (!PHANDLE_VALID(oprom))
1751 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1753 version[sizeof(version) - 1] = 0;
1754 /* XXX might need to add other versions here */
1755 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1756 of_workarounds = OF_WA_CLAIM;
1757 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1758 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1759 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1762 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
1763 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
1764 sizeof(prom.mmumap));
1765 prom.mmumap = be32_to_cpu(prom.mmumap);
1766 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
1767 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1770 #define prom_find_mmu()
1773 static void __init prom_init_stdout(void)
1775 char *path = of_stdout_device;
1777 phandle stdout_node;
1780 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
1781 prom_panic("cannot find stdout");
1783 prom.stdout = be32_to_cpu(val);
1785 /* Get the full OF pathname of the stdout device */
1786 memset(path, 0, 256);
1787 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
1788 prom_printf("OF stdout device is: %s\n", of_stdout_device);
1789 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
1790 path, strlen(path) + 1);
1792 /* instance-to-package fails on PA-Semi */
1793 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
1794 if (stdout_node != PROM_ERROR) {
1795 val = cpu_to_be32(stdout_node);
1796 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
1799 /* If it's a display, note it */
1800 memset(type, 0, sizeof(type));
1801 prom_getprop(stdout_node, "device_type", type, sizeof(type));
1802 if (strcmp(type, "display") == 0)
1803 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
1807 static int __init prom_find_machine_type(void)
1816 /* Look for a PowerMac or a Cell */
1817 len = prom_getprop(prom.root, "compatible",
1818 compat, sizeof(compat)-1);
1822 char *p = &compat[i];
1826 if (strstr(p, "Power Macintosh") ||
1827 strstr(p, "MacRISC"))
1828 return PLATFORM_POWERMAC;
1830 /* We must make sure we don't detect the IBM Cell
1831 * blades as pSeries due to some firmware issues,
1834 if (strstr(p, "IBM,CBEA") ||
1835 strstr(p, "IBM,CPBW-1.0"))
1836 return PLATFORM_GENERIC;
1837 #endif /* CONFIG_PPC64 */
1842 /* Try to detect OPAL */
1843 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
1844 return PLATFORM_OPAL;
1846 /* Try to figure out if it's an IBM pSeries or any other
1847 * PAPR compliant platform. We assume it is if :
1848 * - /device_type is "chrp" (please, do NOT use that for future
1852 len = prom_getprop(prom.root, "device_type",
1853 compat, sizeof(compat)-1);
1855 return PLATFORM_GENERIC;
1856 if (strcmp(compat, "chrp"))
1857 return PLATFORM_GENERIC;
1859 /* Default to pSeries. We need to know if we are running LPAR */
1860 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1861 if (!PHANDLE_VALID(rtas))
1862 return PLATFORM_GENERIC;
1863 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1864 if (x != PROM_ERROR) {
1865 prom_debug("Hypertas detected, assuming LPAR !\n");
1866 return PLATFORM_PSERIES_LPAR;
1868 return PLATFORM_PSERIES;
1870 return PLATFORM_GENERIC;
1874 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1876 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1880 * If we have a display that we don't know how to drive,
1881 * we will want to try to execute OF's open method for it
1882 * later. However, OF will probably fall over if we do that
1883 * we've taken over the MMU.
1884 * So we check whether we will need to open the display,
1885 * and if so, open it now.
1887 static void __init prom_check_displays(void)
1889 char type[16], *path;
1894 static unsigned char default_colors[] = {
1912 const unsigned char *clut;
1914 prom_debug("Looking for displays\n");
1915 for (node = 0; prom_next_node(&node); ) {
1916 memset(type, 0, sizeof(type));
1917 prom_getprop(node, "device_type", type, sizeof(type));
1918 if (strcmp(type, "display") != 0)
1921 /* It seems OF doesn't null-terminate the path :-( */
1922 path = prom_scratch;
1923 memset(path, 0, PROM_SCRATCH_SIZE);
1926 * leave some room at the end of the path for appending extra
1929 if (call_prom("package-to-path", 3, 1, node, path,
1930 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1932 prom_printf("found display : %s, opening... ", path);
1934 ih = call_prom("open", 1, 1, path);
1936 prom_printf("failed\n");
1941 prom_printf("done\n");
1942 prom_setprop(node, path, "linux,opened", NULL, 0);
1944 /* Setup a usable color table when the appropriate
1945 * method is available. Should update this to set-colors */
1946 clut = default_colors;
1947 for (i = 0; i < 16; i++, clut += 3)
1948 if (prom_set_color(ih, i, clut[0], clut[1],
1952 #ifdef CONFIG_LOGO_LINUX_CLUT224
1953 clut = PTRRELOC(logo_linux_clut224.clut);
1954 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
1955 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1958 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1960 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
1961 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
1963 u32 width, height, pitch, addr;
1965 prom_printf("Setting btext !\n");
1966 prom_getprop(node, "width", &width, 4);
1967 prom_getprop(node, "height", &height, 4);
1968 prom_getprop(node, "linebytes", &pitch, 4);
1969 prom_getprop(node, "address", &addr, 4);
1970 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
1971 width, height, pitch, addr);
1972 btext_setup_display(width, height, 8, pitch, addr);
1974 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
1979 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1980 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1981 unsigned long needed, unsigned long align)
1985 *mem_start = _ALIGN(*mem_start, align);
1986 while ((*mem_start + needed) > *mem_end) {
1987 unsigned long room, chunk;
1989 prom_debug("Chunk exhausted, claiming more at %x...\n",
1991 room = alloc_top - alloc_bottom;
1992 if (room > DEVTREE_CHUNK_SIZE)
1993 room = DEVTREE_CHUNK_SIZE;
1994 if (room < PAGE_SIZE)
1995 prom_panic("No memory for flatten_device_tree "
1997 chunk = alloc_up(room, 0);
1999 prom_panic("No memory for flatten_device_tree "
2000 "(claim failed)\n");
2001 *mem_end = chunk + room;
2004 ret = (void *)*mem_start;
2005 *mem_start += needed;
2010 #define dt_push_token(token, mem_start, mem_end) do { \
2011 void *room = make_room(mem_start, mem_end, 4, 4); \
2012 *(__be32 *)room = cpu_to_be32(token); \
2015 static unsigned long __init dt_find_string(char *str)
2019 s = os = (char *)dt_string_start;
2021 while (s < (char *)dt_string_end) {
2022 if (strcmp(s, str) == 0)
2030 * The Open Firmware 1275 specification states properties must be 31 bytes or
2031 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2033 #define MAX_PROPERTY_NAME 64
2035 static void __init scan_dt_build_strings(phandle node,
2036 unsigned long *mem_start,
2037 unsigned long *mem_end)
2039 char *prev_name, *namep, *sstart;
2043 sstart = (char *)dt_string_start;
2045 /* get and store all property names */
2048 /* 64 is max len of name including nul. */
2049 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2050 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2051 /* No more nodes: unwind alloc */
2052 *mem_start = (unsigned long)namep;
2057 if (strcmp(namep, "name") == 0) {
2058 *mem_start = (unsigned long)namep;
2062 /* get/create string entry */
2063 soff = dt_find_string(namep);
2065 *mem_start = (unsigned long)namep;
2066 namep = sstart + soff;
2068 /* Trim off some if we can */
2069 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2070 dt_string_end = *mem_start;
2075 /* do all our children */
2076 child = call_prom("child", 1, 1, node);
2077 while (child != 0) {
2078 scan_dt_build_strings(child, mem_start, mem_end);
2079 child = call_prom("peer", 1, 1, child);
2083 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2084 unsigned long *mem_end)
2087 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2089 unsigned char *valp;
2090 static char pname[MAX_PROPERTY_NAME];
2091 int l, room, has_phandle = 0;
2093 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2095 /* get the node's full name */
2096 namep = (char *)*mem_start;
2097 room = *mem_end - *mem_start;
2100 l = call_prom("package-to-path", 3, 1, node, namep, room);
2102 /* Didn't fit? Get more room. */
2104 if (l >= *mem_end - *mem_start)
2105 namep = make_room(mem_start, mem_end, l+1, 1);
2106 call_prom("package-to-path", 3, 1, node, namep, l);
2110 /* Fixup an Apple bug where they have bogus \0 chars in the
2111 * middle of the path in some properties, and extract
2112 * the unit name (everything after the last '/').
2114 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2121 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2124 /* get it again for debugging */
2125 path = prom_scratch;
2126 memset(path, 0, PROM_SCRATCH_SIZE);
2127 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2129 /* get and store all properties */
2131 sstart = (char *)dt_string_start;
2133 if (call_prom("nextprop", 3, 1, node, prev_name,
2138 if (strcmp(pname, "name") == 0) {
2143 /* find string offset */
2144 soff = dt_find_string(pname);
2146 prom_printf("WARNING: Can't find string index for"
2147 " <%s>, node %s\n", pname, path);
2150 prev_name = sstart + soff;
2153 l = call_prom("getproplen", 2, 1, node, pname);
2156 if (l == PROM_ERROR)
2159 /* push property head */
2160 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2161 dt_push_token(l, mem_start, mem_end);
2162 dt_push_token(soff, mem_start, mem_end);
2164 /* push property content */
2165 valp = make_room(mem_start, mem_end, l, 4);
2166 call_prom("getprop", 4, 1, node, pname, valp, l);
2167 *mem_start = _ALIGN(*mem_start, 4);
2169 if (!strcmp(pname, "phandle"))
2173 /* Add a "linux,phandle" property if no "phandle" property already
2174 * existed (can happen with OPAL)
2177 soff = dt_find_string("linux,phandle");
2179 prom_printf("WARNING: Can't find string index for"
2180 " <linux-phandle> node %s\n", path);
2182 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2183 dt_push_token(4, mem_start, mem_end);
2184 dt_push_token(soff, mem_start, mem_end);
2185 valp = make_room(mem_start, mem_end, 4, 4);
2186 *(__be32 *)valp = cpu_to_be32(node);
2190 /* do all our children */
2191 child = call_prom("child", 1, 1, node);
2192 while (child != 0) {
2193 scan_dt_build_struct(child, mem_start, mem_end);
2194 child = call_prom("peer", 1, 1, child);
2197 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2200 static void __init flatten_device_tree(void)
2203 unsigned long mem_start, mem_end, room;
2204 struct boot_param_header *hdr;
2209 * Check how much room we have between alloc top & bottom (+/- a
2210 * few pages), crop to 1MB, as this is our "chunk" size
2212 room = alloc_top - alloc_bottom - 0x4000;
2213 if (room > DEVTREE_CHUNK_SIZE)
2214 room = DEVTREE_CHUNK_SIZE;
2215 prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2217 /* Now try to claim that */
2218 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2220 prom_panic("Can't allocate initial device-tree chunk\n");
2221 mem_end = mem_start + room;
2223 /* Get root of tree */
2224 root = call_prom("peer", 1, 1, (phandle)0);
2225 if (root == (phandle)0)
2226 prom_panic ("couldn't get device tree root\n");
2228 /* Build header and make room for mem rsv map */
2229 mem_start = _ALIGN(mem_start, 4);
2230 hdr = make_room(&mem_start, &mem_end,
2231 sizeof(struct boot_param_header), 4);
2232 dt_header_start = (unsigned long)hdr;
2233 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2235 /* Start of strings */
2236 mem_start = PAGE_ALIGN(mem_start);
2237 dt_string_start = mem_start;
2238 mem_start += 4; /* hole */
2240 /* Add "linux,phandle" in there, we'll need it */
2241 namep = make_room(&mem_start, &mem_end, 16, 1);
2242 strcpy(namep, "linux,phandle");
2243 mem_start = (unsigned long)namep + strlen(namep) + 1;
2245 /* Build string array */
2246 prom_printf("Building dt strings...\n");
2247 scan_dt_build_strings(root, &mem_start, &mem_end);
2248 dt_string_end = mem_start;
2250 /* Build structure */
2251 mem_start = PAGE_ALIGN(mem_start);
2252 dt_struct_start = mem_start;
2253 prom_printf("Building dt structure...\n");
2254 scan_dt_build_struct(root, &mem_start, &mem_end);
2255 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2256 dt_struct_end = PAGE_ALIGN(mem_start);
2259 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2260 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2261 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2262 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2263 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2264 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2265 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2266 hdr->version = cpu_to_be32(OF_DT_VERSION);
2267 /* Version 16 is not backward compatible */
2268 hdr->last_comp_version = cpu_to_be32(0x10);
2270 /* Copy the reserve map in */
2271 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2276 prom_printf("reserved memory map:\n");
2277 for (i = 0; i < mem_reserve_cnt; i++)
2278 prom_printf(" %x - %x\n",
2279 be64_to_cpu(mem_reserve_map[i].base),
2280 be64_to_cpu(mem_reserve_map[i].size));
2283 /* Bump mem_reserve_cnt to cause further reservations to fail
2284 * since it's too late.
2286 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2288 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2289 dt_string_start, dt_string_end);
2290 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2291 dt_struct_start, dt_struct_end);
2294 #ifdef CONFIG_PPC_MAPLE
2295 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2296 * The values are bad, and it doesn't even have the right number of cells. */
2297 static void __init fixup_device_tree_maple(void)
2300 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2304 name = "/ht@0/isa@4";
2305 isa = call_prom("finddevice", 1, 1, ADDR(name));
2306 if (!PHANDLE_VALID(isa)) {
2307 name = "/ht@0/isa@6";
2308 isa = call_prom("finddevice", 1, 1, ADDR(name));
2309 rloc = 0x01003000; /* IO space; PCI device = 6 */
2311 if (!PHANDLE_VALID(isa))
2314 if (prom_getproplen(isa, "ranges") != 12)
2316 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2320 if (isa_ranges[0] != 0x1 ||
2321 isa_ranges[1] != 0xf4000000 ||
2322 isa_ranges[2] != 0x00010000)
2325 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2327 isa_ranges[0] = 0x1;
2328 isa_ranges[1] = 0x0;
2329 isa_ranges[2] = rloc;
2330 isa_ranges[3] = 0x0;
2331 isa_ranges[4] = 0x0;
2332 isa_ranges[5] = 0x00010000;
2333 prom_setprop(isa, name, "ranges",
2334 isa_ranges, sizeof(isa_ranges));
2337 #define CPC925_MC_START 0xf8000000
2338 #define CPC925_MC_LENGTH 0x1000000
2339 /* The values for memory-controller don't have right number of cells */
2340 static void __init fixup_device_tree_maple_memory_controller(void)
2344 char *name = "/hostbridge@f8000000";
2347 mc = call_prom("finddevice", 1, 1, ADDR(name));
2348 if (!PHANDLE_VALID(mc))
2351 if (prom_getproplen(mc, "reg") != 8)
2354 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2355 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2356 if ((ac != 2) || (sc != 2))
2359 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2362 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2365 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2368 mc_reg[1] = CPC925_MC_START;
2370 mc_reg[3] = CPC925_MC_LENGTH;
2371 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2374 #define fixup_device_tree_maple()
2375 #define fixup_device_tree_maple_memory_controller()
2378 #ifdef CONFIG_PPC_CHRP
2380 * Pegasos and BriQ lacks the "ranges" property in the isa node
2381 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2382 * Pegasos has the IDE configured in legacy mode, but advertised as native
2384 static void __init fixup_device_tree_chrp(void)
2388 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2392 name = "/pci@80000000/isa@c";
2393 ph = call_prom("finddevice", 1, 1, ADDR(name));
2394 if (!PHANDLE_VALID(ph)) {
2395 name = "/pci@ff500000/isa@6";
2396 ph = call_prom("finddevice", 1, 1, ADDR(name));
2397 rloc = 0x01003000; /* IO space; PCI device = 6 */
2399 if (PHANDLE_VALID(ph)) {
2400 rc = prom_getproplen(ph, "ranges");
2401 if (rc == 0 || rc == PROM_ERROR) {
2402 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2409 prop[5] = 0x00010000;
2410 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2414 name = "/pci@80000000/ide@C,1";
2415 ph = call_prom("finddevice", 1, 1, ADDR(name));
2416 if (PHANDLE_VALID(ph)) {
2417 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2420 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2421 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2422 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2423 if (rc == sizeof(u32)) {
2425 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2430 #define fixup_device_tree_chrp()
2433 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2434 static void __init fixup_device_tree_pmac(void)
2436 phandle u3, i2c, mpic;
2441 /* Some G5s have a missing interrupt definition, fix it up here */
2442 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2443 if (!PHANDLE_VALID(u3))
2445 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2446 if (!PHANDLE_VALID(i2c))
2448 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2449 if (!PHANDLE_VALID(mpic))
2452 /* check if proper rev of u3 */
2453 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2456 if (u3_rev < 0x35 || u3_rev > 0x39)
2458 /* does it need fixup ? */
2459 if (prom_getproplen(i2c, "interrupts") > 0)
2462 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2464 /* interrupt on this revision of u3 is number 0 and level */
2467 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2468 &interrupts, sizeof(interrupts));
2470 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2471 &parent, sizeof(parent));
2474 #define fixup_device_tree_pmac()
2477 #ifdef CONFIG_PPC_EFIKA
2479 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2480 * to talk to the phy. If the phy-handle property is missing, then this
2481 * function is called to add the appropriate nodes and link it to the
2484 static void __init fixup_device_tree_efika_add_phy(void)
2490 /* Check if /builtin/ethernet exists - bail if it doesn't */
2491 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2492 if (!PHANDLE_VALID(node))
2495 /* Check if the phy-handle property exists - bail if it does */
2496 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2501 * At this point the ethernet device doesn't have a phy described.
2502 * Now we need to add the missing phy node and linkage
2505 /* Check for an MDIO bus node - if missing then create one */
2506 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2507 if (!PHANDLE_VALID(node)) {
2508 prom_printf("Adding Ethernet MDIO node\n");
2509 call_prom("interpret", 1, 1,
2510 " s\" /builtin\" find-device"
2512 " 1 encode-int s\" #address-cells\" property"
2513 " 0 encode-int s\" #size-cells\" property"
2514 " s\" mdio\" device-name"
2515 " s\" fsl,mpc5200b-mdio\" encode-string"
2516 " s\" compatible\" property"
2517 " 0xf0003000 0x400 reg"
2519 " 0x5 encode-int encode+"
2520 " 0x3 encode-int encode+"
2521 " s\" interrupts\" property"
2525 /* Check for a PHY device node - if missing then create one and
2526 * give it's phandle to the ethernet node */
2527 node = call_prom("finddevice", 1, 1,
2528 ADDR("/builtin/mdio/ethernet-phy"));
2529 if (!PHANDLE_VALID(node)) {
2530 prom_printf("Adding Ethernet PHY node\n");
2531 call_prom("interpret", 1, 1,
2532 " s\" /builtin/mdio\" find-device"
2534 " s\" ethernet-phy\" device-name"
2535 " 0x10 encode-int s\" reg\" property"
2539 " s\" /builtin/ethernet\" find-device"
2541 " s\" phy-handle\" property"
2546 static void __init fixup_device_tree_efika(void)
2548 int sound_irq[3] = { 2, 2, 0 };
2549 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2550 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2551 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2552 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2557 /* Check if we're really running on a EFIKA */
2558 node = call_prom("finddevice", 1, 1, ADDR("/"));
2559 if (!PHANDLE_VALID(node))
2562 rv = prom_getprop(node, "model", prop, sizeof(prop));
2563 if (rv == PROM_ERROR)
2565 if (strcmp(prop, "EFIKA5K2"))
2568 prom_printf("Applying EFIKA device tree fixups\n");
2570 /* Claiming to be 'chrp' is death */
2571 node = call_prom("finddevice", 1, 1, ADDR("/"));
2572 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2573 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2574 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2576 /* CODEGEN,description is exposed in /proc/cpuinfo so
2578 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2579 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2580 prom_setprop(node, "/", "CODEGEN,description",
2581 "Efika 5200B PowerPC System",
2582 sizeof("Efika 5200B PowerPC System"));
2584 /* Fixup bestcomm interrupts property */
2585 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2586 if (PHANDLE_VALID(node)) {
2587 len = prom_getproplen(node, "interrupts");
2589 prom_printf("Fixing bestcomm interrupts property\n");
2590 prom_setprop(node, "/builtin/bestcom", "interrupts",
2591 bcomm_irq, sizeof(bcomm_irq));
2595 /* Fixup sound interrupts property */
2596 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2597 if (PHANDLE_VALID(node)) {
2598 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2599 if (rv == PROM_ERROR) {
2600 prom_printf("Adding sound interrupts property\n");
2601 prom_setprop(node, "/builtin/sound", "interrupts",
2602 sound_irq, sizeof(sound_irq));
2606 /* Make sure ethernet phy-handle property exists */
2607 fixup_device_tree_efika_add_phy();
2610 #define fixup_device_tree_efika()
2613 static void __init fixup_device_tree(void)
2615 fixup_device_tree_maple();
2616 fixup_device_tree_maple_memory_controller();
2617 fixup_device_tree_chrp();
2618 fixup_device_tree_pmac();
2619 fixup_device_tree_efika();
2622 static void __init prom_find_boot_cpu(void)
2629 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
2631 prom_cpu = be32_to_cpu(rval);
2633 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2635 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
2636 prom.cpu = be32_to_cpu(rval);
2638 prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
2641 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2643 #ifdef CONFIG_BLK_DEV_INITRD
2644 if (r3 && r4 && r4 != 0xdeadbeef) {
2647 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
2648 prom_initrd_end = prom_initrd_start + r4;
2650 val = cpu_to_be64(prom_initrd_start);
2651 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
2653 val = cpu_to_be64(prom_initrd_end);
2654 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
2657 reserve_mem(prom_initrd_start,
2658 prom_initrd_end - prom_initrd_start);
2660 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
2661 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
2663 #endif /* CONFIG_BLK_DEV_INITRD */
2667 #ifdef CONFIG_RELOCATABLE
2668 static void reloc_toc(void)
2672 static void unreloc_toc(void)
2676 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
2679 unsigned long *toc_entry;
2681 /* Get the start of the TOC by using r2 directly. */
2682 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
2684 for (i = 0; i < nr_entries; i++) {
2685 *toc_entry = *toc_entry + offset;
2690 static void reloc_toc(void)
2692 unsigned long offset = reloc_offset();
2693 unsigned long nr_entries =
2694 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2696 __reloc_toc(offset, nr_entries);
2701 static void unreloc_toc(void)
2703 unsigned long offset = reloc_offset();
2704 unsigned long nr_entries =
2705 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2709 __reloc_toc(-offset, nr_entries);
2715 * We enter here early on, when the Open Firmware prom is still
2716 * handling exceptions and the MMU hash table for us.
2719 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2721 unsigned long r6, unsigned long r7,
2722 unsigned long kbase)
2727 unsigned long offset = reloc_offset();
2734 * First zero the BSS
2736 memset(&__bss_start, 0, __bss_stop - __bss_start);
2739 * Init interface to Open Firmware, get some node references,
2742 prom_init_client_services(pp);
2745 * See if this OF is old enough that we need to do explicit maps
2746 * and other workarounds
2751 * Init prom stdout device
2755 prom_printf("Preparing to boot %s", linux_banner);
2758 * Get default machine type. At this point, we do not differentiate
2759 * between pSeries SMP and pSeries LPAR
2761 of_platform = prom_find_machine_type();
2762 prom_printf("Detected machine type: %x\n", of_platform);
2764 #ifndef CONFIG_NONSTATIC_KERNEL
2765 /* Bail if this is a kdump kernel. */
2766 if (PHYSICAL_START > 0)
2767 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2771 * Check for an initrd
2773 prom_check_initrd(r3, r4);
2775 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2777 * On pSeries, inform the firmware about our capabilities
2779 if (of_platform == PLATFORM_PSERIES ||
2780 of_platform == PLATFORM_PSERIES_LPAR)
2781 prom_send_capabilities();
2785 * Copy the CPU hold code
2787 if (of_platform != PLATFORM_POWERMAC)
2788 copy_and_flush(0, kbase, 0x100, 0);
2791 * Do early parsing of command line
2793 early_cmdline_parse();
2796 * Initialize memory management within prom_init
2801 * Determine which cpu is actually running right _now_
2803 prom_find_boot_cpu();
2806 * Initialize display devices
2808 prom_check_displays();
2810 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
2812 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2813 * that uses the allocator, we need to make sure we get the top of memory
2814 * available for us here...
2816 if (of_platform == PLATFORM_PSERIES)
2817 prom_initialize_tce_table();
2821 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2822 * have a usable RTAS implementation.
2824 if (of_platform != PLATFORM_POWERMAC &&
2825 of_platform != PLATFORM_OPAL)
2826 prom_instantiate_rtas();
2828 #ifdef CONFIG_PPC_POWERNV
2829 if (of_platform == PLATFORM_OPAL)
2830 prom_instantiate_opal();
2831 #endif /* CONFIG_PPC_POWERNV */
2834 /* instantiate sml */
2835 prom_instantiate_sml();
2839 * On non-powermacs, put all CPUs in spin-loops.
2841 * PowerMacs use a different mechanism to spin CPUs
2843 * (This must be done after instanciating RTAS)
2845 if (of_platform != PLATFORM_POWERMAC &&
2846 of_platform != PLATFORM_OPAL)
2850 * Fill in some infos for use by the kernel later on
2852 if (prom_memory_limit) {
2853 __be64 val = cpu_to_be64(prom_memory_limit);
2854 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
2859 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
2862 if (prom_iommu_force_on)
2863 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
2866 if (prom_tce_alloc_start) {
2867 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
2868 &prom_tce_alloc_start,
2869 sizeof(prom_tce_alloc_start));
2870 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
2871 &prom_tce_alloc_end,
2872 sizeof(prom_tce_alloc_end));
2877 * Fixup any known bugs in the device-tree
2879 fixup_device_tree();
2882 * Now finally create the flattened device-tree
2884 prom_printf("copying OF device tree...\n");
2885 flatten_device_tree();
2888 * in case stdin is USB and still active on IBM machines...
2889 * Unfortunately quiesce crashes on some powermacs if we have
2890 * closed stdin already (in particular the powerbook 101). It
2891 * appears that the OPAL version of OFW doesn't like it either.
2893 if (of_platform != PLATFORM_POWERMAC &&
2894 of_platform != PLATFORM_OPAL)
2898 * Call OF "quiesce" method to shut down pending DMA's from
2901 prom_printf("Calling quiesce...\n");
2902 call_prom("quiesce", 0, 0);
2905 * And finally, call the kernel passing it the flattened device
2906 * tree and NULL as r5, thus triggering the new entry point which
2907 * is common to us and kexec
2909 hdr = dt_header_start;
2911 /* Don't print anything after quiesce under OPAL, it crashes OFW */
2912 if (of_platform != PLATFORM_OPAL) {
2913 prom_printf("returning from prom_init\n");
2914 prom_debug("->dt_header_start=0x%x\n", hdr);
2918 reloc_got2(-offset);
2923 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
2924 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
2925 __start(hdr, kbase, 0, 0, 0,
2926 prom_opal_base, prom_opal_entry);
2928 __start(hdr, kbase, 0, 0, 0, 0, 0);