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>
40 #include <asm/iommu.h>
41 #include <asm/btext.h>
42 #include <asm/sections.h>
43 #include <asm/machdep.h>
46 #include <linux/linux_logo.h>
49 * Eventually bump that one up
51 #define DEVTREE_CHUNK_SIZE 0x100000
54 * This is the size of the local memory reserve map that gets copied
55 * into the boot params passed to the kernel. That size is totally
56 * flexible as the kernel just reads the list until it encounters an
57 * entry with size 0, so it can be changed without breaking binary
60 #define MEM_RESERVE_MAP_SIZE 8
63 * prom_init() is called very early on, before the kernel text
64 * and data have been mapped to KERNELBASE. At this point the code
65 * is running at whatever address it has been loaded at.
66 * On ppc32 we compile with -mrelocatable, which means that references
67 * to extern and static variables get relocated automatically.
68 * ppc64 objects are always relocatable, we just need to relocate the
71 * Because OF may have mapped I/O devices into the area starting at
72 * KERNELBASE, particularly on CHRP machines, we can't safely call
73 * OF once the kernel has been mapped to KERNELBASE. Therefore all
74 * OF calls must be done within prom_init().
76 * ADDR is used in calls to call_prom. The 4th and following
77 * arguments to call_prom should be 32-bit values.
78 * On ppc64, 64 bit values are truncated to 32 bits (and
79 * fortunately don't get interpreted as two arguments).
81 #define ADDR(x) (u32)(unsigned long)(x)
84 #define OF_WORKAROUNDS 0
86 #define OF_WORKAROUNDS of_workarounds
90 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
91 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
93 #define PROM_BUG() do { \
94 prom_printf("kernel BUG at %s line 0x%x!\n", \
95 __FILE__, __LINE__); \
96 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
100 #define prom_debug(x...) prom_printf(x)
102 #define prom_debug(x...)
106 typedef u32 prom_arg_t;
124 struct mem_map_entry {
129 typedef __be32 cell_t;
131 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
132 unsigned long r6, unsigned long r7, unsigned long r8,
136 extern int enter_prom(struct prom_args *args, unsigned long entry);
138 static inline int enter_prom(struct prom_args *args, unsigned long entry)
140 return ((int (*)(struct prom_args *))entry)(args);
144 extern void copy_and_flush(unsigned long dest, unsigned long src,
145 unsigned long size, unsigned long offset);
148 static struct prom_t __initdata prom;
150 static unsigned long prom_entry __initdata;
152 #define PROM_SCRATCH_SIZE 256
154 static char __initdata of_stdout_device[256];
155 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
157 static unsigned long __initdata dt_header_start;
158 static unsigned long __initdata dt_struct_start, dt_struct_end;
159 static unsigned long __initdata dt_string_start, dt_string_end;
161 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
164 static int __initdata prom_iommu_force_on;
165 static int __initdata prom_iommu_off;
166 static unsigned long __initdata prom_tce_alloc_start;
167 static unsigned long __initdata prom_tce_alloc_end;
170 /* Platforms codes are now obsolete in the kernel. Now only used within this
171 * file and ultimately gone too. Feel free to change them if you need, they
172 * are not shared with anything outside of this file anymore
174 #define PLATFORM_PSERIES 0x0100
175 #define PLATFORM_PSERIES_LPAR 0x0101
176 #define PLATFORM_LPAR 0x0001
177 #define PLATFORM_POWERMAC 0x0400
178 #define PLATFORM_GENERIC 0x0500
179 #define PLATFORM_OPAL 0x0600
181 static int __initdata of_platform;
183 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
185 static unsigned long __initdata prom_memory_limit;
187 static unsigned long __initdata alloc_top;
188 static unsigned long __initdata alloc_top_high;
189 static unsigned long __initdata alloc_bottom;
190 static unsigned long __initdata rmo_top;
191 static unsigned long __initdata ram_top;
193 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
194 static int __initdata mem_reserve_cnt;
196 static cell_t __initdata regbuf[1024];
198 static bool rtas_has_query_cpu_stopped;
202 * Error results ... some OF calls will return "-1" on error, some
203 * will return 0, some will return either. To simplify, here are
204 * macros to use with any ihandle or phandle return value to check if
208 #define PROM_ERROR (-1u)
209 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
210 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
213 /* This is the one and *ONLY* place where we actually call open
217 static int __init call_prom(const char *service, int nargs, int nret, ...)
220 struct prom_args args;
223 args.service = cpu_to_be32(ADDR(service));
224 args.nargs = cpu_to_be32(nargs);
225 args.nret = cpu_to_be32(nret);
227 va_start(list, nret);
228 for (i = 0; i < nargs; i++)
229 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
232 for (i = 0; i < nret; i++)
233 args.args[nargs+i] = 0;
235 if (enter_prom(&args, prom_entry) < 0)
238 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
241 static int __init call_prom_ret(const char *service, int nargs, int nret,
242 prom_arg_t *rets, ...)
245 struct prom_args args;
248 args.service = cpu_to_be32(ADDR(service));
249 args.nargs = cpu_to_be32(nargs);
250 args.nret = cpu_to_be32(nret);
252 va_start(list, rets);
253 for (i = 0; i < nargs; i++)
254 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
257 for (i = 0; i < nret; i++)
258 args.args[nargs+i] = 0;
260 if (enter_prom(&args, prom_entry) < 0)
264 for (i = 1; i < nret; ++i)
265 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
267 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
271 static void __init prom_print(const char *msg)
275 if (prom.stdout == 0)
278 for (p = msg; *p != 0; p = q) {
279 for (q = p; *q != 0 && *q != '\n'; ++q)
282 call_prom("write", 3, 1, prom.stdout, p, q - p);
286 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
291 static void __init prom_print_hex(unsigned long val)
293 int i, nibbles = sizeof(val)*2;
294 char buf[sizeof(val)*2+1];
296 for (i = nibbles-1; i >= 0; i--) {
297 buf[i] = (val & 0xf) + '0';
299 buf[i] += ('a'-'0'-10);
303 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
306 /* max number of decimal digits in an unsigned long */
308 static void __init prom_print_dec(unsigned long val)
311 char buf[UL_DIGITS+1];
313 for (i = UL_DIGITS-1; i >= 0; i--) {
314 buf[i] = (val % 10) + '0';
319 /* shift stuff down */
320 size = UL_DIGITS - i;
321 call_prom("write", 3, 1, prom.stdout, buf+i, size);
324 static void __init prom_printf(const char *format, ...)
326 const char *p, *q, *s;
331 va_start(args, format);
332 for (p = format; *p != 0; p = q) {
333 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
336 call_prom("write", 3, 1, prom.stdout, p, q - p);
341 call_prom("write", 3, 1, prom.stdout,
351 s = va_arg(args, const char *);
356 v = va_arg(args, unsigned long);
361 vs = va_arg(args, int);
372 else if (*q == 'x') {
374 v = va_arg(args, unsigned long);
376 } else if (*q == 'u') { /* '%lu' */
378 v = va_arg(args, unsigned long);
380 } else if (*q == 'd') { /* %ld */
382 vs = va_arg(args, long);
395 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
399 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
401 * Old OF requires we claim physical and virtual separately
402 * and then map explicitly (assuming virtual mode)
407 ret = call_prom_ret("call-method", 5, 2, &result,
408 ADDR("claim"), prom.memory,
410 if (ret != 0 || result == -1)
412 ret = call_prom_ret("call-method", 5, 2, &result,
413 ADDR("claim"), prom.mmumap,
416 call_prom("call-method", 4, 1, ADDR("release"),
417 prom.memory, size, virt);
420 /* the 0x12 is M (coherence) + PP == read/write */
421 call_prom("call-method", 6, 1,
422 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
425 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
429 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
432 /* Do not call exit because it clears the screen on pmac
433 * it also causes some sort of double-fault on early pmacs */
434 if (of_platform == PLATFORM_POWERMAC)
437 /* ToDo: should put up an SRC here on pSeries */
438 call_prom("exit", 0, 0);
440 for (;;) /* should never get here */
445 static int __init prom_next_node(phandle *nodep)
449 if ((node = *nodep) != 0
450 && (*nodep = call_prom("child", 1, 1, node)) != 0)
452 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
455 if ((node = call_prom("parent", 1, 1, node)) == 0)
457 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
462 static int inline prom_getprop(phandle node, const char *pname,
463 void *value, size_t valuelen)
465 return call_prom("getprop", 4, 1, node, ADDR(pname),
466 (u32)(unsigned long) value, (u32) valuelen);
469 static int inline prom_getproplen(phandle node, const char *pname)
471 return call_prom("getproplen", 2, 1, node, ADDR(pname));
474 static void add_string(char **str, const char *q)
484 static char *tohex(unsigned int x)
486 static char digits[] = "0123456789abcdef";
487 static char result[9];
494 result[i] = digits[x & 0xf];
496 } while (x != 0 && i > 0);
500 static int __init prom_setprop(phandle node, const char *nodename,
501 const char *pname, void *value, size_t valuelen)
505 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
506 return call_prom("setprop", 4, 1, node, ADDR(pname),
507 (u32)(unsigned long) value, (u32) valuelen);
509 /* gah... setprop doesn't work on longtrail, have to use interpret */
511 add_string(&p, "dev");
512 add_string(&p, nodename);
513 add_string(&p, tohex((u32)(unsigned long) value));
514 add_string(&p, tohex(valuelen));
515 add_string(&p, tohex(ADDR(pname)));
516 add_string(&p, tohex(strlen(pname)));
517 add_string(&p, "property");
519 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
522 /* We can't use the standard versions because of relocation headaches. */
523 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
524 || ('a' <= (c) && (c) <= 'f') \
525 || ('A' <= (c) && (c) <= 'F'))
527 #define isdigit(c) ('0' <= (c) && (c) <= '9')
528 #define islower(c) ('a' <= (c) && (c) <= 'z')
529 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
531 static unsigned long prom_strtoul(const char *cp, const char **endp)
533 unsigned long result = 0, base = 10, value;
538 if (toupper(*cp) == 'X') {
544 while (isxdigit(*cp) &&
545 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
546 result = result * base + value;
556 static unsigned long prom_memparse(const char *ptr, const char **retptr)
558 unsigned long ret = prom_strtoul(ptr, retptr);
562 * We can't use a switch here because GCC *may* generate a
563 * jump table which won't work, because we're not running at
564 * the address we're linked at.
566 if ('G' == **retptr || 'g' == **retptr)
569 if ('M' == **retptr || 'm' == **retptr)
572 if ('K' == **retptr || 'k' == **retptr)
584 * Early parsing of the command line passed to the kernel, used for
585 * "mem=x" and the options that affect the iommu
587 static void __init early_cmdline_parse(void)
594 prom_cmd_line[0] = 0;
596 if ((long)prom.chosen > 0)
597 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
598 #ifdef CONFIG_CMDLINE
599 if (l <= 0 || p[0] == '\0') /* dbl check */
600 strlcpy(prom_cmd_line,
601 CONFIG_CMDLINE, sizeof(prom_cmd_line));
602 #endif /* CONFIG_CMDLINE */
603 prom_printf("command line: %s\n", prom_cmd_line);
606 opt = strstr(prom_cmd_line, "iommu=");
608 prom_printf("iommu opt is: %s\n", opt);
610 while (*opt && *opt == ' ')
612 if (!strncmp(opt, "off", 3))
614 else if (!strncmp(opt, "force", 5))
615 prom_iommu_force_on = 1;
618 opt = strstr(prom_cmd_line, "mem=");
621 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
623 /* Align to 16 MB == size of ppc64 large page */
624 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
629 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
631 * The architecture vector has an array of PVR mask/value pairs,
632 * followed by # option vectors - 1, followed by the option vectors.
634 * See prom.h for the definition of the bits specified in the
635 * architecture vector.
637 * Because the description vector contains a mix of byte and word
638 * values, we declare it as an unsigned char array, and use this
639 * macro to put word values in.
641 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
642 ((x) >> 8) & 0xff, (x) & 0xff
644 /* Firmware expects the value to be n - 1, where n is the # of vectors */
645 #define NUM_VECTORS(n) ((n) - 1)
648 * Firmware expects 1 + n - 2, where n is the length of the option vector in
649 * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
651 #define VECTOR_LENGTH(n) (1 + (n) - 2)
653 unsigned char ibm_architecture_vec[] = {
654 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
655 W(0xffff0000), W(0x003e0000), /* POWER6 */
656 W(0xffff0000), W(0x003f0000), /* POWER7 */
657 W(0xffff0000), W(0x004b0000), /* POWER8E */
658 W(0xffff0000), W(0x004d0000), /* POWER8 */
659 W(0xffffffff), W(0x0f000004), /* all 2.07-compliant */
660 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
661 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
662 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
663 NUM_VECTORS(6), /* 6 option vectors */
665 /* option vector 1: processor architectures supported */
666 VECTOR_LENGTH(2), /* length */
667 0, /* don't ignore, don't halt */
668 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
669 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
671 /* option vector 2: Open Firmware options supported */
672 VECTOR_LENGTH(33), /* length */
675 W(0xffffffff), /* real_base */
676 W(0xffffffff), /* real_size */
677 W(0xffffffff), /* virt_base */
678 W(0xffffffff), /* virt_size */
679 W(0xffffffff), /* load_base */
680 W(256), /* 256MB min RMA */
681 W(0xffffffff), /* full client load */
682 0, /* min RMA percentage of total RAM */
683 48, /* max log_2(hash table size) */
685 /* option vector 3: processor options supported */
686 VECTOR_LENGTH(2), /* length */
687 0, /* don't ignore, don't halt */
688 OV3_FP | OV3_VMX | OV3_DFP,
690 /* option vector 4: IBM PAPR implementation */
691 VECTOR_LENGTH(2), /* length */
693 OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
695 /* option vector 5: PAPR/OF options */
696 VECTOR_LENGTH(18), /* length */
697 0, /* don't ignore, don't halt */
698 OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
699 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
700 #ifdef CONFIG_PCI_MSI
701 /* PCIe/MSI support. Without MSI full PCIe is not supported */
707 #ifdef CONFIG_PPC_SMLPAR
708 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
712 OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
716 /* WARNING: The offset of the "number of cores" field below
717 * must match by the macro below. Update the definition if
718 * the structure layout changes.
720 #define IBM_ARCH_VEC_NRCORES_OFFSET 125
721 W(NR_CPUS), /* number of cores supported */
726 OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) |
727 OV5_FEAT(OV5_PFO_HW_842),
728 OV5_FEAT(OV5_SUB_PROCESSORS),
730 /* option vector 6: IBM PAPR hints */
731 VECTOR_LENGTH(3), /* length */
737 /* Old method - ELF header with PT_NOTE sections only works on BE */
738 #ifdef __BIG_ENDIAN__
739 static struct fake_elf {
746 char name[8]; /* "PowerPC" */
760 char name[24]; /* "IBM,RPA-Client-Config" */
774 .e_ident = { 0x7f, 'E', 'L', 'F',
775 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
776 .e_type = ET_EXEC, /* yeah right */
778 .e_version = EV_CURRENT,
779 .e_phoff = offsetof(struct fake_elf, phdr),
780 .e_phentsize = sizeof(Elf32_Phdr),
786 .p_offset = offsetof(struct fake_elf, chrpnote),
787 .p_filesz = sizeof(struct chrpnote)
790 .p_offset = offsetof(struct fake_elf, rpanote),
791 .p_filesz = sizeof(struct rpanote)
795 .namesz = sizeof("PowerPC"),
796 .descsz = sizeof(struct chrpdesc),
800 .real_mode = ~0U, /* ~0 means "don't care" */
809 .namesz = sizeof("IBM,RPA-Client-Config"),
810 .descsz = sizeof(struct rpadesc),
812 .name = "IBM,RPA-Client-Config",
815 .min_rmo_size = 64, /* in megabytes */
816 .min_rmo_percent = 0,
817 .max_pft_size = 48, /* 2^48 bytes max PFT size */
824 #endif /* __BIG_ENDIAN__ */
826 static int __init prom_count_smt_threads(void)
832 /* Pick up th first CPU node we can find */
833 for (node = 0; prom_next_node(&node); ) {
835 prom_getprop(node, "device_type", type, sizeof(type));
837 if (strcmp(type, "cpu"))
840 * There is an entry for each smt thread, each entry being
841 * 4 bytes long. All cpus should have the same number of
842 * smt threads, so return after finding the first.
844 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
845 if (plen == PROM_ERROR)
848 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
851 if (plen < 1 || plen > 64) {
852 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
853 (unsigned long)plen);
858 prom_debug("No threads found, assuming 1 per core\n");
865 static void __init prom_send_capabilities(void)
870 unsigned char *ptcores;
872 root = call_prom("open", 1, 1, ADDR("/"));
874 /* We need to tell the FW about the number of cores we support.
876 * To do that, we count the number of threads on the first core
877 * (we assume this is the same for all cores) and use it to
881 /* The core value may start at an odd address. If such a word
882 * access is made at a cache line boundary, this leads to an
883 * exception which may not be handled at this time.
884 * Forcing a per byte access to avoid exception.
886 ptcores = &ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET];
888 cores |= ptcores[0] << 24;
889 cores |= ptcores[1] << 16;
890 cores |= ptcores[2] << 8;
892 if (cores != NR_CPUS) {
893 prom_printf("WARNING ! "
894 "ibm_architecture_vec structure inconsistent: %lu!\n",
897 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
898 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
900 ptcores[0] = (cores >> 24) & 0xff;
901 ptcores[1] = (cores >> 16) & 0xff;
902 ptcores[2] = (cores >> 8) & 0xff;
903 ptcores[3] = cores & 0xff;
906 /* try calling the ibm,client-architecture-support method */
907 prom_printf("Calling ibm,client-architecture-support...");
908 if (call_prom_ret("call-method", 3, 2, &ret,
909 ADDR("ibm,client-architecture-support"),
911 ADDR(ibm_architecture_vec)) == 0) {
912 /* the call exists... */
914 prom_printf("\nWARNING: ibm,client-architecture"
915 "-support call FAILED!\n");
916 call_prom("close", 1, 0, root);
917 prom_printf(" done\n");
920 call_prom("close", 1, 0, root);
921 prom_printf(" not implemented\n");
924 #ifdef __BIG_ENDIAN__
928 /* no ibm,client-architecture-support call, try the old way */
929 elfloader = call_prom("open", 1, 1,
930 ADDR("/packages/elf-loader"));
931 if (elfloader == 0) {
932 prom_printf("couldn't open /packages/elf-loader\n");
935 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
936 elfloader, ADDR(&fake_elf));
937 call_prom("close", 1, 0, elfloader);
939 #endif /* __BIG_ENDIAN__ */
941 #endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
944 * Memory allocation strategy... our layout is normally:
946 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
947 * rare cases, initrd might end up being before the kernel though.
948 * We assume this won't override the final kernel at 0, we have no
949 * provision to handle that in this version, but it should hopefully
952 * alloc_top is set to the top of RMO, eventually shrink down if the
955 * alloc_bottom is set to the top of kernel/initrd
957 * from there, allocations are done this way : rtas is allocated
958 * topmost, and the device-tree is allocated from the bottom. We try
959 * to grow the device-tree allocation as we progress. If we can't,
960 * then we fail, we don't currently have a facility to restart
961 * elsewhere, but that shouldn't be necessary.
963 * Note that calls to reserve_mem have to be done explicitly, memory
964 * allocated with either alloc_up or alloc_down isn't automatically
970 * Allocates memory in the RMO upward from the kernel/initrd
972 * When align is 0, this is a special case, it means to allocate in place
973 * at the current location of alloc_bottom or fail (that is basically
974 * extending the previous allocation). Used for the device-tree flattening
976 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
978 unsigned long base = alloc_bottom;
979 unsigned long addr = 0;
982 base = _ALIGN_UP(base, align);
983 prom_debug("alloc_up(%x, %x)\n", size, align);
985 prom_panic("alloc_up() called with mem not initialized\n");
988 base = _ALIGN_UP(alloc_bottom, align);
992 for(; (base + size) <= alloc_top;
993 base = _ALIGN_UP(base + 0x100000, align)) {
994 prom_debug(" trying: 0x%x\n\r", base);
995 addr = (unsigned long)prom_claim(base, size, 0);
996 if (addr != PROM_ERROR && addr != 0)
1004 alloc_bottom = addr + size;
1006 prom_debug(" -> %x\n", addr);
1007 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1008 prom_debug(" alloc_top : %x\n", alloc_top);
1009 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1010 prom_debug(" rmo_top : %x\n", rmo_top);
1011 prom_debug(" ram_top : %x\n", ram_top);
1017 * Allocates memory downward, either from top of RMO, or if highmem
1018 * is set, from the top of RAM. Note that this one doesn't handle
1019 * failures. It does claim memory if highmem is not set.
1021 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1024 unsigned long base, addr = 0;
1026 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1027 highmem ? "(high)" : "(low)");
1029 prom_panic("alloc_down() called with mem not initialized\n");
1032 /* Carve out storage for the TCE table. */
1033 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1034 if (addr <= alloc_bottom)
1036 /* Will we bump into the RMO ? If yes, check out that we
1037 * didn't overlap existing allocations there, if we did,
1038 * we are dead, we must be the first in town !
1040 if (addr < rmo_top) {
1041 /* Good, we are first */
1042 if (alloc_top == rmo_top)
1043 alloc_top = rmo_top = addr;
1047 alloc_top_high = addr;
1051 base = _ALIGN_DOWN(alloc_top - size, align);
1052 for (; base > alloc_bottom;
1053 base = _ALIGN_DOWN(base - 0x100000, align)) {
1054 prom_debug(" trying: 0x%x\n\r", base);
1055 addr = (unsigned long)prom_claim(base, size, 0);
1056 if (addr != PROM_ERROR && addr != 0)
1065 prom_debug(" -> %x\n", addr);
1066 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1067 prom_debug(" alloc_top : %x\n", alloc_top);
1068 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1069 prom_debug(" rmo_top : %x\n", rmo_top);
1070 prom_debug(" ram_top : %x\n", ram_top);
1076 * Parse a "reg" cell
1078 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1081 unsigned long r = 0;
1083 /* Ignore more than 2 cells */
1084 while (s > sizeof(unsigned long) / 4) {
1088 r = be32_to_cpu(*p++);
1092 r |= be32_to_cpu(*(p++));
1100 * Very dumb function for adding to the memory reserve list, but
1101 * we don't need anything smarter at this point
1103 * XXX Eventually check for collisions. They should NEVER happen.
1104 * If problems seem to show up, it would be a good start to track
1107 static void __init reserve_mem(u64 base, u64 size)
1109 u64 top = base + size;
1110 unsigned long cnt = mem_reserve_cnt;
1115 /* We need to always keep one empty entry so that we
1116 * have our terminator with "size" set to 0 since we are
1117 * dumb and just copy this entire array to the boot params
1119 base = _ALIGN_DOWN(base, PAGE_SIZE);
1120 top = _ALIGN_UP(top, PAGE_SIZE);
1123 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1124 prom_panic("Memory reserve map exhausted !\n");
1125 mem_reserve_map[cnt].base = cpu_to_be64(base);
1126 mem_reserve_map[cnt].size = cpu_to_be64(size);
1127 mem_reserve_cnt = cnt + 1;
1131 * Initialize memory allocation mechanism, parse "memory" nodes and
1132 * obtain that way the top of memory and RMO to setup out local allocator
1134 static void __init prom_init_mem(void)
1137 char *path, type[64];
1144 * We iterate the memory nodes to find
1145 * 1) top of RMO (first node)
1148 val = cpu_to_be32(2);
1149 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1150 rac = be32_to_cpu(val);
1151 val = cpu_to_be32(1);
1152 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1153 rsc = be32_to_cpu(val);
1154 prom_debug("root_addr_cells: %x\n", rac);
1155 prom_debug("root_size_cells: %x\n", rsc);
1157 prom_debug("scanning memory:\n");
1158 path = prom_scratch;
1160 for (node = 0; prom_next_node(&node); ) {
1162 prom_getprop(node, "device_type", type, sizeof(type));
1166 * CHRP Longtrail machines have no device_type
1167 * on the memory node, so check the name instead...
1169 prom_getprop(node, "name", type, sizeof(type));
1171 if (strcmp(type, "memory"))
1174 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1175 if (plen > sizeof(regbuf)) {
1176 prom_printf("memory node too large for buffer !\n");
1177 plen = sizeof(regbuf);
1180 endp = p + (plen / sizeof(cell_t));
1183 memset(path, 0, PROM_SCRATCH_SIZE);
1184 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1185 prom_debug(" node %s :\n", path);
1186 #endif /* DEBUG_PROM */
1188 while ((endp - p) >= (rac + rsc)) {
1189 unsigned long base, size;
1191 base = prom_next_cell(rac, &p);
1192 size = prom_next_cell(rsc, &p);
1196 prom_debug(" %x %x\n", base, size);
1197 if (base == 0 && (of_platform & PLATFORM_LPAR))
1199 if ((base + size) > ram_top)
1200 ram_top = base + size;
1204 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1207 * If prom_memory_limit is set we reduce the upper limits *except* for
1208 * alloc_top_high. This must be the real top of RAM so we can put
1212 alloc_top_high = ram_top;
1214 if (prom_memory_limit) {
1215 if (prom_memory_limit <= alloc_bottom) {
1216 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1218 prom_memory_limit = 0;
1219 } else if (prom_memory_limit >= ram_top) {
1220 prom_printf("Ignoring mem=%x >= ram_top.\n",
1222 prom_memory_limit = 0;
1224 ram_top = prom_memory_limit;
1225 rmo_top = min(rmo_top, prom_memory_limit);
1230 * Setup our top alloc point, that is top of RMO or top of
1231 * segment 0 when running non-LPAR.
1232 * Some RS64 machines have buggy firmware where claims up at
1233 * 1GB fail. Cap at 768MB as a workaround.
1234 * Since 768MB is plenty of room, and we need to cap to something
1235 * reasonable on 32-bit, cap at 768MB on all machines.
1239 rmo_top = min(0x30000000ul, rmo_top);
1240 alloc_top = rmo_top;
1241 alloc_top_high = ram_top;
1244 * Check if we have an initrd after the kernel but still inside
1245 * the RMO. If we do move our bottom point to after it.
1247 if (prom_initrd_start &&
1248 prom_initrd_start < rmo_top &&
1249 prom_initrd_end > alloc_bottom)
1250 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1252 prom_printf("memory layout at init:\n");
1253 prom_printf(" memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1254 prom_printf(" alloc_bottom : %x\n", alloc_bottom);
1255 prom_printf(" alloc_top : %x\n", alloc_top);
1256 prom_printf(" alloc_top_hi : %x\n", alloc_top_high);
1257 prom_printf(" rmo_top : %x\n", rmo_top);
1258 prom_printf(" ram_top : %x\n", ram_top);
1261 static void __init prom_close_stdin(void)
1266 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1267 stdin = be32_to_cpu(val);
1268 call_prom("close", 1, 0, stdin);
1272 #ifdef CONFIG_PPC_POWERNV
1274 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1275 static u64 __initdata prom_opal_base;
1276 static u64 __initdata prom_opal_entry;
1280 * Allocate room for and instantiate OPAL
1282 static void __init prom_instantiate_opal(void)
1287 u64 size = 0, align = 0x10000;
1291 prom_debug("prom_instantiate_opal: start...\n");
1293 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1294 prom_debug("opal_node: %x\n", opal_node);
1295 if (!PHANDLE_VALID(opal_node))
1299 prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
1300 size = be64_to_cpu(val64);
1304 prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
1305 align = be64_to_cpu(val64);
1307 base = alloc_down(size, align, 0);
1309 prom_printf("OPAL allocation failed !\n");
1313 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1314 if (!IHANDLE_VALID(opal_inst)) {
1315 prom_printf("opening opal package failed (%x)\n", opal_inst);
1319 prom_printf("instantiating opal at 0x%x...", base);
1321 if (call_prom_ret("call-method", 4, 3, rets,
1322 ADDR("load-opal-runtime"),
1324 base >> 32, base & 0xffffffff) != 0
1325 || (rets[0] == 0 && rets[1] == 0)) {
1326 prom_printf(" failed\n");
1329 entry = (((u64)rets[0]) << 32) | rets[1];
1331 prom_printf(" done\n");
1333 reserve_mem(base, size);
1335 prom_debug("opal base = 0x%x\n", base);
1336 prom_debug("opal align = 0x%x\n", align);
1337 prom_debug("opal entry = 0x%x\n", entry);
1338 prom_debug("opal size = 0x%x\n", (long)size);
1340 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1341 &base, sizeof(base));
1342 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1343 &entry, sizeof(entry));
1345 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1346 prom_opal_base = base;
1347 prom_opal_entry = entry;
1349 prom_debug("prom_instantiate_opal: end...\n");
1352 #endif /* CONFIG_PPC_POWERNV */
1355 * Allocate room for and instantiate RTAS
1357 static void __init prom_instantiate_rtas(void)
1361 u32 base, entry = 0;
1365 prom_debug("prom_instantiate_rtas: start...\n");
1367 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1368 prom_debug("rtas_node: %x\n", rtas_node);
1369 if (!PHANDLE_VALID(rtas_node))
1373 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1374 size = be32_to_cpu(val);
1378 base = alloc_down(size, PAGE_SIZE, 0);
1380 prom_panic("Could not allocate memory for RTAS\n");
1382 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1383 if (!IHANDLE_VALID(rtas_inst)) {
1384 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1388 prom_printf("instantiating rtas at 0x%x...", base);
1390 if (call_prom_ret("call-method", 3, 2, &entry,
1391 ADDR("instantiate-rtas"),
1392 rtas_inst, base) != 0
1394 prom_printf(" failed\n");
1397 prom_printf(" done\n");
1399 reserve_mem(base, size);
1401 val = cpu_to_be32(base);
1402 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1404 val = cpu_to_be32(entry);
1405 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1408 /* Check if it supports "query-cpu-stopped-state" */
1409 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1410 &val, sizeof(val)) != PROM_ERROR)
1411 rtas_has_query_cpu_stopped = true;
1413 prom_debug("rtas base = 0x%x\n", base);
1414 prom_debug("rtas entry = 0x%x\n", entry);
1415 prom_debug("rtas size = 0x%x\n", (long)size);
1417 prom_debug("prom_instantiate_rtas: end...\n");
1422 * Allocate room for and instantiate Stored Measurement Log (SML)
1424 static void __init prom_instantiate_sml(void)
1426 phandle ibmvtpm_node;
1427 ihandle ibmvtpm_inst;
1428 u32 entry = 0, size = 0;
1431 prom_debug("prom_instantiate_sml: start...\n");
1433 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/ibm,vtpm"));
1434 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1435 if (!PHANDLE_VALID(ibmvtpm_node))
1438 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/ibm,vtpm"));
1439 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1440 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1444 if (call_prom_ret("call-method", 2, 2, &size,
1445 ADDR("sml-get-handover-size"),
1446 ibmvtpm_inst) != 0 || size == 0) {
1447 prom_printf("SML get handover size failed\n");
1451 base = alloc_down(size, PAGE_SIZE, 0);
1453 prom_panic("Could not allocate memory for sml\n");
1455 prom_printf("instantiating sml at 0x%x...", base);
1457 if (call_prom_ret("call-method", 4, 2, &entry,
1458 ADDR("sml-handover"),
1459 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1460 prom_printf("SML handover failed\n");
1463 prom_printf(" done\n");
1465 reserve_mem(base, size);
1467 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-base",
1468 &base, sizeof(base));
1469 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-size",
1470 &size, sizeof(size));
1472 prom_debug("sml base = 0x%x\n", base);
1473 prom_debug("sml size = 0x%x\n", (long)size);
1475 prom_debug("prom_instantiate_sml: end...\n");
1479 * Allocate room for and initialize TCE tables
1481 #ifdef __BIG_ENDIAN__
1482 static void __init prom_initialize_tce_table(void)
1486 char compatible[64], type[64], model[64];
1487 char *path = prom_scratch;
1489 u32 minalign, minsize;
1490 u64 tce_entry, *tce_entryp;
1491 u64 local_alloc_top, local_alloc_bottom;
1497 prom_debug("starting prom_initialize_tce_table\n");
1499 /* Cache current top of allocs so we reserve a single block */
1500 local_alloc_top = alloc_top_high;
1501 local_alloc_bottom = local_alloc_top;
1503 /* Search all nodes looking for PHBs. */
1504 for (node = 0; prom_next_node(&node); ) {
1508 prom_getprop(node, "compatible",
1509 compatible, sizeof(compatible));
1510 prom_getprop(node, "device_type", type, sizeof(type));
1511 prom_getprop(node, "model", model, sizeof(model));
1513 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1516 /* Keep the old logic intact to avoid regression. */
1517 if (compatible[0] != 0) {
1518 if ((strstr(compatible, "python") == NULL) &&
1519 (strstr(compatible, "Speedwagon") == NULL) &&
1520 (strstr(compatible, "Winnipeg") == NULL))
1522 } else if (model[0] != 0) {
1523 if ((strstr(model, "ython") == NULL) &&
1524 (strstr(model, "peedwagon") == NULL) &&
1525 (strstr(model, "innipeg") == NULL))
1529 if (prom_getprop(node, "tce-table-minalign", &minalign,
1530 sizeof(minalign)) == PROM_ERROR)
1532 if (prom_getprop(node, "tce-table-minsize", &minsize,
1533 sizeof(minsize)) == PROM_ERROR)
1534 minsize = 4UL << 20;
1537 * Even though we read what OF wants, we just set the table
1538 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1539 * By doing this, we avoid the pitfalls of trying to DMA to
1540 * MMIO space and the DMA alias hole.
1542 * On POWER4, firmware sets the TCE region by assuming
1543 * each TCE table is 8MB. Using this memory for anything
1544 * else will impact performance, so we always allocate 8MB.
1547 if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
1548 minsize = 8UL << 20;
1550 minsize = 4UL << 20;
1552 /* Align to the greater of the align or size */
1553 align = max(minalign, minsize);
1554 base = alloc_down(minsize, align, 1);
1556 prom_panic("ERROR, cannot find space for TCE table.\n");
1557 if (base < local_alloc_bottom)
1558 local_alloc_bottom = base;
1560 /* It seems OF doesn't null-terminate the path :-( */
1561 memset(path, 0, PROM_SCRATCH_SIZE);
1562 /* Call OF to setup the TCE hardware */
1563 if (call_prom("package-to-path", 3, 1, node,
1564 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1565 prom_printf("package-to-path failed\n");
1568 /* Save away the TCE table attributes for later use. */
1569 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1570 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1572 prom_debug("TCE table: %s\n", path);
1573 prom_debug("\tnode = 0x%x\n", node);
1574 prom_debug("\tbase = 0x%x\n", base);
1575 prom_debug("\tsize = 0x%x\n", minsize);
1577 /* Initialize the table to have a one-to-one mapping
1578 * over the allocated size.
1580 tce_entryp = (u64 *)base;
1581 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1582 tce_entry = (i << PAGE_SHIFT);
1584 *tce_entryp = tce_entry;
1587 prom_printf("opening PHB %s", path);
1588 phb_node = call_prom("open", 1, 1, path);
1590 prom_printf("... failed\n");
1592 prom_printf("... done\n");
1594 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1595 phb_node, -1, minsize,
1596 (u32) base, (u32) (base >> 32));
1597 call_prom("close", 1, 0, phb_node);
1600 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1602 /* These are only really needed if there is a memory limit in
1603 * effect, but we don't know so export them always. */
1604 prom_tce_alloc_start = local_alloc_bottom;
1605 prom_tce_alloc_end = local_alloc_top;
1607 /* Flag the first invalid entry */
1608 prom_debug("ending prom_initialize_tce_table\n");
1610 #endif /* __BIG_ENDIAN__ */
1611 #endif /* CONFIG_PPC64 */
1614 * With CHRP SMP we need to use the OF to start the other processors.
1615 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1616 * so we have to put the processors into a holding pattern controlled
1617 * by the kernel (not OF) before we destroy the OF.
1619 * This uses a chunk of low memory, puts some holding pattern
1620 * code there and sends the other processors off to there until
1621 * smp_boot_cpus tells them to do something. The holding pattern
1622 * checks that address until its cpu # is there, when it is that
1623 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1624 * of setting those values.
1626 * We also use physical address 0x4 here to tell when a cpu
1627 * is in its holding pattern code.
1632 * We want to reference the copy of __secondary_hold_* in the
1633 * 0 - 0x100 address range
1635 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1637 static void __init prom_hold_cpus(void)
1642 unsigned long *spinloop
1643 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1644 unsigned long *acknowledge
1645 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1646 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1649 * On pseries, if RTAS supports "query-cpu-stopped-state",
1650 * we skip this stage, the CPUs will be started by the
1651 * kernel using RTAS.
1653 if ((of_platform == PLATFORM_PSERIES ||
1654 of_platform == PLATFORM_PSERIES_LPAR) &&
1655 rtas_has_query_cpu_stopped) {
1656 prom_printf("prom_hold_cpus: skipped\n");
1660 prom_debug("prom_hold_cpus: start...\n");
1661 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1662 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1663 prom_debug(" 1) acknowledge = 0x%x\n",
1664 (unsigned long)acknowledge);
1665 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1666 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1668 /* Set the common spinloop variable, so all of the secondary cpus
1669 * will block when they are awakened from their OF spinloop.
1670 * This must occur for both SMP and non SMP kernels, since OF will
1671 * be trashed when we move the kernel.
1676 for (node = 0; prom_next_node(&node); ) {
1677 unsigned int cpu_no;
1681 prom_getprop(node, "device_type", type, sizeof(type));
1682 if (strcmp(type, "cpu") != 0)
1685 /* Skip non-configured cpus. */
1686 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1687 if (strcmp(type, "okay") != 0)
1690 reg = cpu_to_be32(-1); /* make sparse happy */
1691 prom_getprop(node, "reg", ®, sizeof(reg));
1692 cpu_no = be32_to_cpu(reg);
1694 prom_debug("cpu hw idx = %lu\n", cpu_no);
1696 /* Init the acknowledge var which will be reset by
1697 * the secondary cpu when it awakens from its OF
1700 *acknowledge = (unsigned long)-1;
1702 if (cpu_no != prom.cpu) {
1703 /* Primary Thread of non-boot cpu or any thread */
1704 prom_printf("starting cpu hw idx %lu... ", cpu_no);
1705 call_prom("start-cpu", 3, 0, node,
1706 secondary_hold, cpu_no);
1708 for (i = 0; (i < 100000000) &&
1709 (*acknowledge == ((unsigned long)-1)); i++ )
1712 if (*acknowledge == cpu_no)
1713 prom_printf("done\n");
1715 prom_printf("failed: %x\n", *acknowledge);
1719 prom_printf("boot cpu hw idx %lu\n", cpu_no);
1720 #endif /* CONFIG_SMP */
1723 prom_debug("prom_hold_cpus: end...\n");
1727 static void __init prom_init_client_services(unsigned long pp)
1729 /* Get a handle to the prom entry point before anything else */
1732 /* get a handle for the stdout device */
1733 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1734 if (!PHANDLE_VALID(prom.chosen))
1735 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1737 /* get device tree root */
1738 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
1739 if (!PHANDLE_VALID(prom.root))
1740 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1747 * For really old powermacs, we need to map things we claim.
1748 * For that, we need the ihandle of the mmu.
1749 * Also, on the longtrail, we need to work around other bugs.
1751 static void __init prom_find_mmu(void)
1756 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1757 if (!PHANDLE_VALID(oprom))
1759 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1761 version[sizeof(version) - 1] = 0;
1762 /* XXX might need to add other versions here */
1763 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1764 of_workarounds = OF_WA_CLAIM;
1765 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1766 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1767 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1770 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
1771 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
1772 sizeof(prom.mmumap));
1773 prom.mmumap = be32_to_cpu(prom.mmumap);
1774 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
1775 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1778 #define prom_find_mmu()
1781 static void __init prom_init_stdout(void)
1783 char *path = of_stdout_device;
1785 phandle stdout_node;
1788 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
1789 prom_panic("cannot find stdout");
1791 prom.stdout = be32_to_cpu(val);
1793 /* Get the full OF pathname of the stdout device */
1794 memset(path, 0, 256);
1795 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
1796 prom_printf("OF stdout device is: %s\n", of_stdout_device);
1797 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
1798 path, strlen(path) + 1);
1800 /* instance-to-package fails on PA-Semi */
1801 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
1802 if (stdout_node != PROM_ERROR) {
1803 val = cpu_to_be32(stdout_node);
1804 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
1807 /* If it's a display, note it */
1808 memset(type, 0, sizeof(type));
1809 prom_getprop(stdout_node, "device_type", type, sizeof(type));
1810 if (strcmp(type, "display") == 0)
1811 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
1815 static int __init prom_find_machine_type(void)
1824 /* Look for a PowerMac or a Cell */
1825 len = prom_getprop(prom.root, "compatible",
1826 compat, sizeof(compat)-1);
1830 char *p = &compat[i];
1834 if (strstr(p, "Power Macintosh") ||
1835 strstr(p, "MacRISC"))
1836 return PLATFORM_POWERMAC;
1838 /* We must make sure we don't detect the IBM Cell
1839 * blades as pSeries due to some firmware issues,
1842 if (strstr(p, "IBM,CBEA") ||
1843 strstr(p, "IBM,CPBW-1.0"))
1844 return PLATFORM_GENERIC;
1845 #endif /* CONFIG_PPC64 */
1850 /* Try to detect OPAL */
1851 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
1852 return PLATFORM_OPAL;
1854 /* Try to figure out if it's an IBM pSeries or any other
1855 * PAPR compliant platform. We assume it is if :
1856 * - /device_type is "chrp" (please, do NOT use that for future
1860 len = prom_getprop(prom.root, "device_type",
1861 compat, sizeof(compat)-1);
1863 return PLATFORM_GENERIC;
1864 if (strcmp(compat, "chrp"))
1865 return PLATFORM_GENERIC;
1867 /* Default to pSeries. We need to know if we are running LPAR */
1868 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1869 if (!PHANDLE_VALID(rtas))
1870 return PLATFORM_GENERIC;
1871 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1872 if (x != PROM_ERROR) {
1873 prom_debug("Hypertas detected, assuming LPAR !\n");
1874 return PLATFORM_PSERIES_LPAR;
1876 return PLATFORM_PSERIES;
1878 return PLATFORM_GENERIC;
1882 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1884 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1888 * If we have a display that we don't know how to drive,
1889 * we will want to try to execute OF's open method for it
1890 * later. However, OF will probably fall over if we do that
1891 * we've taken over the MMU.
1892 * So we check whether we will need to open the display,
1893 * and if so, open it now.
1895 static void __init prom_check_displays(void)
1897 char type[16], *path;
1902 static unsigned char default_colors[] = {
1920 const unsigned char *clut;
1922 prom_debug("Looking for displays\n");
1923 for (node = 0; prom_next_node(&node); ) {
1924 memset(type, 0, sizeof(type));
1925 prom_getprop(node, "device_type", type, sizeof(type));
1926 if (strcmp(type, "display") != 0)
1929 /* It seems OF doesn't null-terminate the path :-( */
1930 path = prom_scratch;
1931 memset(path, 0, PROM_SCRATCH_SIZE);
1934 * leave some room at the end of the path for appending extra
1937 if (call_prom("package-to-path", 3, 1, node, path,
1938 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1940 prom_printf("found display : %s, opening... ", path);
1942 ih = call_prom("open", 1, 1, path);
1944 prom_printf("failed\n");
1949 prom_printf("done\n");
1950 prom_setprop(node, path, "linux,opened", NULL, 0);
1952 /* Setup a usable color table when the appropriate
1953 * method is available. Should update this to set-colors */
1954 clut = default_colors;
1955 for (i = 0; i < 16; i++, clut += 3)
1956 if (prom_set_color(ih, i, clut[0], clut[1],
1960 #ifdef CONFIG_LOGO_LINUX_CLUT224
1961 clut = PTRRELOC(logo_linux_clut224.clut);
1962 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
1963 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1966 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1968 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
1969 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
1971 u32 width, height, pitch, addr;
1973 prom_printf("Setting btext !\n");
1974 prom_getprop(node, "width", &width, 4);
1975 prom_getprop(node, "height", &height, 4);
1976 prom_getprop(node, "linebytes", &pitch, 4);
1977 prom_getprop(node, "address", &addr, 4);
1978 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
1979 width, height, pitch, addr);
1980 btext_setup_display(width, height, 8, pitch, addr);
1982 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
1987 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1988 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1989 unsigned long needed, unsigned long align)
1993 *mem_start = _ALIGN(*mem_start, align);
1994 while ((*mem_start + needed) > *mem_end) {
1995 unsigned long room, chunk;
1997 prom_debug("Chunk exhausted, claiming more at %x...\n",
1999 room = alloc_top - alloc_bottom;
2000 if (room > DEVTREE_CHUNK_SIZE)
2001 room = DEVTREE_CHUNK_SIZE;
2002 if (room < PAGE_SIZE)
2003 prom_panic("No memory for flatten_device_tree "
2005 chunk = alloc_up(room, 0);
2007 prom_panic("No memory for flatten_device_tree "
2008 "(claim failed)\n");
2009 *mem_end = chunk + room;
2012 ret = (void *)*mem_start;
2013 *mem_start += needed;
2018 #define dt_push_token(token, mem_start, mem_end) do { \
2019 void *room = make_room(mem_start, mem_end, 4, 4); \
2020 *(__be32 *)room = cpu_to_be32(token); \
2023 static unsigned long __init dt_find_string(char *str)
2027 s = os = (char *)dt_string_start;
2029 while (s < (char *)dt_string_end) {
2030 if (strcmp(s, str) == 0)
2038 * The Open Firmware 1275 specification states properties must be 31 bytes or
2039 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2041 #define MAX_PROPERTY_NAME 64
2043 static void __init scan_dt_build_strings(phandle node,
2044 unsigned long *mem_start,
2045 unsigned long *mem_end)
2047 char *prev_name, *namep, *sstart;
2051 sstart = (char *)dt_string_start;
2053 /* get and store all property names */
2056 /* 64 is max len of name including nul. */
2057 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2058 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2059 /* No more nodes: unwind alloc */
2060 *mem_start = (unsigned long)namep;
2065 if (strcmp(namep, "name") == 0) {
2066 *mem_start = (unsigned long)namep;
2070 /* get/create string entry */
2071 soff = dt_find_string(namep);
2073 *mem_start = (unsigned long)namep;
2074 namep = sstart + soff;
2076 /* Trim off some if we can */
2077 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2078 dt_string_end = *mem_start;
2083 /* do all our children */
2084 child = call_prom("child", 1, 1, node);
2085 while (child != 0) {
2086 scan_dt_build_strings(child, mem_start, mem_end);
2087 child = call_prom("peer", 1, 1, child);
2091 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2092 unsigned long *mem_end)
2095 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2097 unsigned char *valp;
2098 static char pname[MAX_PROPERTY_NAME];
2099 int l, room, has_phandle = 0;
2101 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2103 /* get the node's full name */
2104 namep = (char *)*mem_start;
2105 room = *mem_end - *mem_start;
2108 l = call_prom("package-to-path", 3, 1, node, namep, room);
2110 /* Didn't fit? Get more room. */
2112 if (l >= *mem_end - *mem_start)
2113 namep = make_room(mem_start, mem_end, l+1, 1);
2114 call_prom("package-to-path", 3, 1, node, namep, l);
2118 /* Fixup an Apple bug where they have bogus \0 chars in the
2119 * middle of the path in some properties, and extract
2120 * the unit name (everything after the last '/').
2122 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2129 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2132 /* get it again for debugging */
2133 path = prom_scratch;
2134 memset(path, 0, PROM_SCRATCH_SIZE);
2135 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2137 /* get and store all properties */
2139 sstart = (char *)dt_string_start;
2141 if (call_prom("nextprop", 3, 1, node, prev_name,
2146 if (strcmp(pname, "name") == 0) {
2151 /* find string offset */
2152 soff = dt_find_string(pname);
2154 prom_printf("WARNING: Can't find string index for"
2155 " <%s>, node %s\n", pname, path);
2158 prev_name = sstart + soff;
2161 l = call_prom("getproplen", 2, 1, node, pname);
2164 if (l == PROM_ERROR)
2167 /* push property head */
2168 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2169 dt_push_token(l, mem_start, mem_end);
2170 dt_push_token(soff, mem_start, mem_end);
2172 /* push property content */
2173 valp = make_room(mem_start, mem_end, l, 4);
2174 call_prom("getprop", 4, 1, node, pname, valp, l);
2175 *mem_start = _ALIGN(*mem_start, 4);
2177 if (!strcmp(pname, "phandle"))
2181 /* Add a "linux,phandle" property if no "phandle" property already
2182 * existed (can happen with OPAL)
2185 soff = dt_find_string("linux,phandle");
2187 prom_printf("WARNING: Can't find string index for"
2188 " <linux-phandle> node %s\n", path);
2190 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2191 dt_push_token(4, mem_start, mem_end);
2192 dt_push_token(soff, mem_start, mem_end);
2193 valp = make_room(mem_start, mem_end, 4, 4);
2194 *(__be32 *)valp = cpu_to_be32(node);
2198 /* do all our children */
2199 child = call_prom("child", 1, 1, node);
2200 while (child != 0) {
2201 scan_dt_build_struct(child, mem_start, mem_end);
2202 child = call_prom("peer", 1, 1, child);
2205 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2208 static void __init flatten_device_tree(void)
2211 unsigned long mem_start, mem_end, room;
2212 struct boot_param_header *hdr;
2217 * Check how much room we have between alloc top & bottom (+/- a
2218 * few pages), crop to 1MB, as this is our "chunk" size
2220 room = alloc_top - alloc_bottom - 0x4000;
2221 if (room > DEVTREE_CHUNK_SIZE)
2222 room = DEVTREE_CHUNK_SIZE;
2223 prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2225 /* Now try to claim that */
2226 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2228 prom_panic("Can't allocate initial device-tree chunk\n");
2229 mem_end = mem_start + room;
2231 /* Get root of tree */
2232 root = call_prom("peer", 1, 1, (phandle)0);
2233 if (root == (phandle)0)
2234 prom_panic ("couldn't get device tree root\n");
2236 /* Build header and make room for mem rsv map */
2237 mem_start = _ALIGN(mem_start, 4);
2238 hdr = make_room(&mem_start, &mem_end,
2239 sizeof(struct boot_param_header), 4);
2240 dt_header_start = (unsigned long)hdr;
2241 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2243 /* Start of strings */
2244 mem_start = PAGE_ALIGN(mem_start);
2245 dt_string_start = mem_start;
2246 mem_start += 4; /* hole */
2248 /* Add "linux,phandle" in there, we'll need it */
2249 namep = make_room(&mem_start, &mem_end, 16, 1);
2250 strcpy(namep, "linux,phandle");
2251 mem_start = (unsigned long)namep + strlen(namep) + 1;
2253 /* Build string array */
2254 prom_printf("Building dt strings...\n");
2255 scan_dt_build_strings(root, &mem_start, &mem_end);
2256 dt_string_end = mem_start;
2258 /* Build structure */
2259 mem_start = PAGE_ALIGN(mem_start);
2260 dt_struct_start = mem_start;
2261 prom_printf("Building dt structure...\n");
2262 scan_dt_build_struct(root, &mem_start, &mem_end);
2263 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2264 dt_struct_end = PAGE_ALIGN(mem_start);
2267 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2268 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2269 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2270 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2271 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2272 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2273 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2274 hdr->version = cpu_to_be32(OF_DT_VERSION);
2275 /* Version 16 is not backward compatible */
2276 hdr->last_comp_version = cpu_to_be32(0x10);
2278 /* Copy the reserve map in */
2279 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2284 prom_printf("reserved memory map:\n");
2285 for (i = 0; i < mem_reserve_cnt; i++)
2286 prom_printf(" %x - %x\n",
2287 be64_to_cpu(mem_reserve_map[i].base),
2288 be64_to_cpu(mem_reserve_map[i].size));
2291 /* Bump mem_reserve_cnt to cause further reservations to fail
2292 * since it's too late.
2294 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2296 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2297 dt_string_start, dt_string_end);
2298 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2299 dt_struct_start, dt_struct_end);
2302 #ifdef CONFIG_PPC_MAPLE
2303 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2304 * The values are bad, and it doesn't even have the right number of cells. */
2305 static void __init fixup_device_tree_maple(void)
2308 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2312 name = "/ht@0/isa@4";
2313 isa = call_prom("finddevice", 1, 1, ADDR(name));
2314 if (!PHANDLE_VALID(isa)) {
2315 name = "/ht@0/isa@6";
2316 isa = call_prom("finddevice", 1, 1, ADDR(name));
2317 rloc = 0x01003000; /* IO space; PCI device = 6 */
2319 if (!PHANDLE_VALID(isa))
2322 if (prom_getproplen(isa, "ranges") != 12)
2324 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2328 if (isa_ranges[0] != 0x1 ||
2329 isa_ranges[1] != 0xf4000000 ||
2330 isa_ranges[2] != 0x00010000)
2333 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2335 isa_ranges[0] = 0x1;
2336 isa_ranges[1] = 0x0;
2337 isa_ranges[2] = rloc;
2338 isa_ranges[3] = 0x0;
2339 isa_ranges[4] = 0x0;
2340 isa_ranges[5] = 0x00010000;
2341 prom_setprop(isa, name, "ranges",
2342 isa_ranges, sizeof(isa_ranges));
2345 #define CPC925_MC_START 0xf8000000
2346 #define CPC925_MC_LENGTH 0x1000000
2347 /* The values for memory-controller don't have right number of cells */
2348 static void __init fixup_device_tree_maple_memory_controller(void)
2352 char *name = "/hostbridge@f8000000";
2355 mc = call_prom("finddevice", 1, 1, ADDR(name));
2356 if (!PHANDLE_VALID(mc))
2359 if (prom_getproplen(mc, "reg") != 8)
2362 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2363 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2364 if ((ac != 2) || (sc != 2))
2367 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2370 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2373 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2376 mc_reg[1] = CPC925_MC_START;
2378 mc_reg[3] = CPC925_MC_LENGTH;
2379 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2382 #define fixup_device_tree_maple()
2383 #define fixup_device_tree_maple_memory_controller()
2386 #ifdef CONFIG_PPC_CHRP
2388 * Pegasos and BriQ lacks the "ranges" property in the isa node
2389 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2390 * Pegasos has the IDE configured in legacy mode, but advertised as native
2392 static void __init fixup_device_tree_chrp(void)
2396 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2400 name = "/pci@80000000/isa@c";
2401 ph = call_prom("finddevice", 1, 1, ADDR(name));
2402 if (!PHANDLE_VALID(ph)) {
2403 name = "/pci@ff500000/isa@6";
2404 ph = call_prom("finddevice", 1, 1, ADDR(name));
2405 rloc = 0x01003000; /* IO space; PCI device = 6 */
2407 if (PHANDLE_VALID(ph)) {
2408 rc = prom_getproplen(ph, "ranges");
2409 if (rc == 0 || rc == PROM_ERROR) {
2410 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2417 prop[5] = 0x00010000;
2418 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2422 name = "/pci@80000000/ide@C,1";
2423 ph = call_prom("finddevice", 1, 1, ADDR(name));
2424 if (PHANDLE_VALID(ph)) {
2425 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2428 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2429 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2430 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2431 if (rc == sizeof(u32)) {
2433 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2438 #define fixup_device_tree_chrp()
2441 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2442 static void __init fixup_device_tree_pmac(void)
2444 phandle u3, i2c, mpic;
2449 /* Some G5s have a missing interrupt definition, fix it up here */
2450 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2451 if (!PHANDLE_VALID(u3))
2453 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2454 if (!PHANDLE_VALID(i2c))
2456 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2457 if (!PHANDLE_VALID(mpic))
2460 /* check if proper rev of u3 */
2461 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2464 if (u3_rev < 0x35 || u3_rev > 0x39)
2466 /* does it need fixup ? */
2467 if (prom_getproplen(i2c, "interrupts") > 0)
2470 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2472 /* interrupt on this revision of u3 is number 0 and level */
2475 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2476 &interrupts, sizeof(interrupts));
2478 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2479 &parent, sizeof(parent));
2482 #define fixup_device_tree_pmac()
2485 #ifdef CONFIG_PPC_EFIKA
2487 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2488 * to talk to the phy. If the phy-handle property is missing, then this
2489 * function is called to add the appropriate nodes and link it to the
2492 static void __init fixup_device_tree_efika_add_phy(void)
2498 /* Check if /builtin/ethernet exists - bail if it doesn't */
2499 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2500 if (!PHANDLE_VALID(node))
2503 /* Check if the phy-handle property exists - bail if it does */
2504 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2509 * At this point the ethernet device doesn't have a phy described.
2510 * Now we need to add the missing phy node and linkage
2513 /* Check for an MDIO bus node - if missing then create one */
2514 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2515 if (!PHANDLE_VALID(node)) {
2516 prom_printf("Adding Ethernet MDIO node\n");
2517 call_prom("interpret", 1, 1,
2518 " s\" /builtin\" find-device"
2520 " 1 encode-int s\" #address-cells\" property"
2521 " 0 encode-int s\" #size-cells\" property"
2522 " s\" mdio\" device-name"
2523 " s\" fsl,mpc5200b-mdio\" encode-string"
2524 " s\" compatible\" property"
2525 " 0xf0003000 0x400 reg"
2527 " 0x5 encode-int encode+"
2528 " 0x3 encode-int encode+"
2529 " s\" interrupts\" property"
2533 /* Check for a PHY device node - if missing then create one and
2534 * give it's phandle to the ethernet node */
2535 node = call_prom("finddevice", 1, 1,
2536 ADDR("/builtin/mdio/ethernet-phy"));
2537 if (!PHANDLE_VALID(node)) {
2538 prom_printf("Adding Ethernet PHY node\n");
2539 call_prom("interpret", 1, 1,
2540 " s\" /builtin/mdio\" find-device"
2542 " s\" ethernet-phy\" device-name"
2543 " 0x10 encode-int s\" reg\" property"
2547 " s\" /builtin/ethernet\" find-device"
2549 " s\" phy-handle\" property"
2554 static void __init fixup_device_tree_efika(void)
2556 int sound_irq[3] = { 2, 2, 0 };
2557 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2558 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2559 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2560 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2565 /* Check if we're really running on a EFIKA */
2566 node = call_prom("finddevice", 1, 1, ADDR("/"));
2567 if (!PHANDLE_VALID(node))
2570 rv = prom_getprop(node, "model", prop, sizeof(prop));
2571 if (rv == PROM_ERROR)
2573 if (strcmp(prop, "EFIKA5K2"))
2576 prom_printf("Applying EFIKA device tree fixups\n");
2578 /* Claiming to be 'chrp' is death */
2579 node = call_prom("finddevice", 1, 1, ADDR("/"));
2580 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2581 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2582 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2584 /* CODEGEN,description is exposed in /proc/cpuinfo so
2586 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2587 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2588 prom_setprop(node, "/", "CODEGEN,description",
2589 "Efika 5200B PowerPC System",
2590 sizeof("Efika 5200B PowerPC System"));
2592 /* Fixup bestcomm interrupts property */
2593 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2594 if (PHANDLE_VALID(node)) {
2595 len = prom_getproplen(node, "interrupts");
2597 prom_printf("Fixing bestcomm interrupts property\n");
2598 prom_setprop(node, "/builtin/bestcom", "interrupts",
2599 bcomm_irq, sizeof(bcomm_irq));
2603 /* Fixup sound interrupts property */
2604 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2605 if (PHANDLE_VALID(node)) {
2606 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2607 if (rv == PROM_ERROR) {
2608 prom_printf("Adding sound interrupts property\n");
2609 prom_setprop(node, "/builtin/sound", "interrupts",
2610 sound_irq, sizeof(sound_irq));
2614 /* Make sure ethernet phy-handle property exists */
2615 fixup_device_tree_efika_add_phy();
2618 #define fixup_device_tree_efika()
2621 static void __init fixup_device_tree(void)
2623 fixup_device_tree_maple();
2624 fixup_device_tree_maple_memory_controller();
2625 fixup_device_tree_chrp();
2626 fixup_device_tree_pmac();
2627 fixup_device_tree_efika();
2630 static void __init prom_find_boot_cpu(void)
2637 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
2639 prom_cpu = be32_to_cpu(rval);
2641 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2643 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
2644 prom.cpu = be32_to_cpu(rval);
2646 prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
2649 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2651 #ifdef CONFIG_BLK_DEV_INITRD
2652 if (r3 && r4 && r4 != 0xdeadbeef) {
2655 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
2656 prom_initrd_end = prom_initrd_start + r4;
2658 val = cpu_to_be64(prom_initrd_start);
2659 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
2661 val = cpu_to_be64(prom_initrd_end);
2662 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
2665 reserve_mem(prom_initrd_start,
2666 prom_initrd_end - prom_initrd_start);
2668 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
2669 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
2671 #endif /* CONFIG_BLK_DEV_INITRD */
2675 #ifdef CONFIG_RELOCATABLE
2676 static void reloc_toc(void)
2680 static void unreloc_toc(void)
2684 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
2687 unsigned long *toc_entry;
2689 /* Get the start of the TOC by using r2 directly. */
2690 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
2692 for (i = 0; i < nr_entries; i++) {
2693 *toc_entry = *toc_entry + offset;
2698 static void reloc_toc(void)
2700 unsigned long offset = reloc_offset();
2701 unsigned long nr_entries =
2702 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2704 __reloc_toc(offset, nr_entries);
2709 static void unreloc_toc(void)
2711 unsigned long offset = reloc_offset();
2712 unsigned long nr_entries =
2713 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2717 __reloc_toc(-offset, nr_entries);
2723 * We enter here early on, when the Open Firmware prom is still
2724 * handling exceptions and the MMU hash table for us.
2727 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2729 unsigned long r6, unsigned long r7,
2730 unsigned long kbase)
2735 unsigned long offset = reloc_offset();
2742 * First zero the BSS
2744 memset(&__bss_start, 0, __bss_stop - __bss_start);
2747 * Init interface to Open Firmware, get some node references,
2750 prom_init_client_services(pp);
2753 * See if this OF is old enough that we need to do explicit maps
2754 * and other workarounds
2759 * Init prom stdout device
2763 prom_printf("Preparing to boot %s", linux_banner);
2766 * Get default machine type. At this point, we do not differentiate
2767 * between pSeries SMP and pSeries LPAR
2769 of_platform = prom_find_machine_type();
2770 prom_printf("Detected machine type: %x\n", of_platform);
2772 #ifndef CONFIG_NONSTATIC_KERNEL
2773 /* Bail if this is a kdump kernel. */
2774 if (PHYSICAL_START > 0)
2775 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2779 * Check for an initrd
2781 prom_check_initrd(r3, r4);
2783 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2785 * On pSeries, inform the firmware about our capabilities
2787 if (of_platform == PLATFORM_PSERIES ||
2788 of_platform == PLATFORM_PSERIES_LPAR)
2789 prom_send_capabilities();
2793 * Copy the CPU hold code
2795 if (of_platform != PLATFORM_POWERMAC)
2796 copy_and_flush(0, kbase, 0x100, 0);
2799 * Do early parsing of command line
2801 early_cmdline_parse();
2804 * Initialize memory management within prom_init
2809 * Determine which cpu is actually running right _now_
2811 prom_find_boot_cpu();
2814 * Initialize display devices
2816 prom_check_displays();
2818 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
2820 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2821 * that uses the allocator, we need to make sure we get the top of memory
2822 * available for us here...
2824 if (of_platform == PLATFORM_PSERIES)
2825 prom_initialize_tce_table();
2829 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2830 * have a usable RTAS implementation.
2832 if (of_platform != PLATFORM_POWERMAC &&
2833 of_platform != PLATFORM_OPAL)
2834 prom_instantiate_rtas();
2836 #ifdef CONFIG_PPC_POWERNV
2837 if (of_platform == PLATFORM_OPAL)
2838 prom_instantiate_opal();
2839 #endif /* CONFIG_PPC_POWERNV */
2842 /* instantiate sml */
2843 prom_instantiate_sml();
2847 * On non-powermacs, put all CPUs in spin-loops.
2849 * PowerMacs use a different mechanism to spin CPUs
2851 * (This must be done after instanciating RTAS)
2853 if (of_platform != PLATFORM_POWERMAC &&
2854 of_platform != PLATFORM_OPAL)
2858 * Fill in some infos for use by the kernel later on
2860 if (prom_memory_limit) {
2861 __be64 val = cpu_to_be64(prom_memory_limit);
2862 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
2867 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
2870 if (prom_iommu_force_on)
2871 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
2874 if (prom_tce_alloc_start) {
2875 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
2876 &prom_tce_alloc_start,
2877 sizeof(prom_tce_alloc_start));
2878 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
2879 &prom_tce_alloc_end,
2880 sizeof(prom_tce_alloc_end));
2885 * Fixup any known bugs in the device-tree
2887 fixup_device_tree();
2890 * Now finally create the flattened device-tree
2892 prom_printf("copying OF device tree...\n");
2893 flatten_device_tree();
2896 * in case stdin is USB and still active on IBM machines...
2897 * Unfortunately quiesce crashes on some powermacs if we have
2898 * closed stdin already (in particular the powerbook 101). It
2899 * appears that the OPAL version of OFW doesn't like it either.
2901 if (of_platform != PLATFORM_POWERMAC &&
2902 of_platform != PLATFORM_OPAL)
2906 * Call OF "quiesce" method to shut down pending DMA's from
2909 prom_printf("Quiescing Open Firmware ...\n");
2910 call_prom("quiesce", 0, 0);
2913 * And finally, call the kernel passing it the flattened device
2914 * tree and NULL as r5, thus triggering the new entry point which
2915 * is common to us and kexec
2917 hdr = dt_header_start;
2919 /* Don't print anything after quiesce under OPAL, it crashes OFW */
2920 if (of_platform != PLATFORM_OPAL) {
2921 prom_printf("Booting Linux via __start() ...\n");
2922 prom_debug("->dt_header_start=0x%x\n", hdr);
2926 reloc_got2(-offset);
2931 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
2932 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
2933 __start(hdr, kbase, 0, 0, 0,
2934 prom_opal_base, prom_opal_entry);
2936 __start(hdr, kbase, 0, 0, 0, 0, 0);