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>
45 #include <asm/asm-prototypes.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);
397 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
401 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
403 * Old OF requires we claim physical and virtual separately
404 * and then map explicitly (assuming virtual mode)
409 ret = call_prom_ret("call-method", 5, 2, &result,
410 ADDR("claim"), prom.memory,
412 if (ret != 0 || result == -1)
414 ret = call_prom_ret("call-method", 5, 2, &result,
415 ADDR("claim"), prom.mmumap,
418 call_prom("call-method", 4, 1, ADDR("release"),
419 prom.memory, size, virt);
422 /* the 0x12 is M (coherence) + PP == read/write */
423 call_prom("call-method", 6, 1,
424 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
427 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
431 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
434 /* Do not call exit because it clears the screen on pmac
435 * it also causes some sort of double-fault on early pmacs */
436 if (of_platform == PLATFORM_POWERMAC)
439 /* ToDo: should put up an SRC here on pSeries */
440 call_prom("exit", 0, 0);
442 for (;;) /* should never get here */
447 static int __init prom_next_node(phandle *nodep)
451 if ((node = *nodep) != 0
452 && (*nodep = call_prom("child", 1, 1, node)) != 0)
454 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
457 if ((node = call_prom("parent", 1, 1, node)) == 0)
459 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
464 static int inline prom_getprop(phandle node, const char *pname,
465 void *value, size_t valuelen)
467 return call_prom("getprop", 4, 1, node, ADDR(pname),
468 (u32)(unsigned long) value, (u32) valuelen);
471 static int inline prom_getproplen(phandle node, const char *pname)
473 return call_prom("getproplen", 2, 1, node, ADDR(pname));
476 static void add_string(char **str, const char *q)
486 static char *tohex(unsigned int x)
488 static char digits[] = "0123456789abcdef";
489 static char result[9];
496 result[i] = digits[x & 0xf];
498 } while (x != 0 && i > 0);
502 static int __init prom_setprop(phandle node, const char *nodename,
503 const char *pname, void *value, size_t valuelen)
507 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
508 return call_prom("setprop", 4, 1, node, ADDR(pname),
509 (u32)(unsigned long) value, (u32) valuelen);
511 /* gah... setprop doesn't work on longtrail, have to use interpret */
513 add_string(&p, "dev");
514 add_string(&p, nodename);
515 add_string(&p, tohex((u32)(unsigned long) value));
516 add_string(&p, tohex(valuelen));
517 add_string(&p, tohex(ADDR(pname)));
518 add_string(&p, tohex(strlen(pname)));
519 add_string(&p, "property");
521 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
524 /* We can't use the standard versions because of relocation headaches. */
525 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
526 || ('a' <= (c) && (c) <= 'f') \
527 || ('A' <= (c) && (c) <= 'F'))
529 #define isdigit(c) ('0' <= (c) && (c) <= '9')
530 #define islower(c) ('a' <= (c) && (c) <= 'z')
531 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
533 static unsigned long prom_strtoul(const char *cp, const char **endp)
535 unsigned long result = 0, base = 10, value;
540 if (toupper(*cp) == 'X') {
546 while (isxdigit(*cp) &&
547 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
548 result = result * base + value;
558 static unsigned long prom_memparse(const char *ptr, const char **retptr)
560 unsigned long ret = prom_strtoul(ptr, retptr);
564 * We can't use a switch here because GCC *may* generate a
565 * jump table which won't work, because we're not running at
566 * the address we're linked at.
568 if ('G' == **retptr || 'g' == **retptr)
571 if ('M' == **retptr || 'm' == **retptr)
574 if ('K' == **retptr || 'k' == **retptr)
586 * Early parsing of the command line passed to the kernel, used for
587 * "mem=x" and the options that affect the iommu
589 static void __init early_cmdline_parse(void)
596 prom_cmd_line[0] = 0;
598 if ((long)prom.chosen > 0)
599 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
600 #ifdef CONFIG_CMDLINE
601 if (l <= 0 || p[0] == '\0') /* dbl check */
602 strlcpy(prom_cmd_line,
603 CONFIG_CMDLINE, sizeof(prom_cmd_line));
604 #endif /* CONFIG_CMDLINE */
605 prom_printf("command line: %s\n", prom_cmd_line);
608 opt = strstr(prom_cmd_line, "iommu=");
610 prom_printf("iommu opt is: %s\n", opt);
612 while (*opt && *opt == ' ')
614 if (!strncmp(opt, "off", 3))
616 else if (!strncmp(opt, "force", 5))
617 prom_iommu_force_on = 1;
620 opt = strstr(prom_cmd_line, "mem=");
623 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
625 /* Align to 16 MB == size of ppc64 large page */
626 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
631 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
633 * The architecture vector has an array of PVR mask/value pairs,
634 * followed by # option vectors - 1, followed by the option vectors.
636 * See prom.h for the definition of the bits specified in the
637 * architecture vector.
639 * Because the description vector contains a mix of byte and word
640 * values, we declare it as an unsigned char array, and use this
641 * macro to put word values in.
643 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
644 ((x) >> 8) & 0xff, (x) & 0xff
646 /* Firmware expects the value to be n - 1, where n is the # of vectors */
647 #define NUM_VECTORS(n) ((n) - 1)
650 * Firmware expects 1 + n - 2, where n is the length of the option vector in
651 * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
653 #define VECTOR_LENGTH(n) (1 + (n) - 2)
655 unsigned char ibm_architecture_vec[] = {
656 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
657 W(0xffff0000), W(0x003e0000), /* POWER6 */
658 W(0xffff0000), W(0x003f0000), /* POWER7 */
659 W(0xffff0000), W(0x004b0000), /* POWER8E */
660 W(0xffff0000), W(0x004c0000), /* POWER8NVL */
661 W(0xffff0000), W(0x004d0000), /* POWER8 */
662 W(0xffffffff), W(0x0f000004), /* all 2.07-compliant */
663 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
664 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
665 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
666 NUM_VECTORS(6), /* 6 option vectors */
668 /* option vector 1: processor architectures supported */
669 VECTOR_LENGTH(2), /* length */
670 0, /* don't ignore, don't halt */
671 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
672 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
674 /* option vector 2: Open Firmware options supported */
675 VECTOR_LENGTH(33), /* length */
678 W(0xffffffff), /* real_base */
679 W(0xffffffff), /* real_size */
680 W(0xffffffff), /* virt_base */
681 W(0xffffffff), /* virt_size */
682 W(0xffffffff), /* load_base */
683 W(256), /* 256MB min RMA */
684 W(0xffffffff), /* full client load */
685 0, /* min RMA percentage of total RAM */
686 48, /* max log_2(hash table size) */
688 /* option vector 3: processor options supported */
689 VECTOR_LENGTH(2), /* length */
690 0, /* don't ignore, don't halt */
691 OV3_FP | OV3_VMX | OV3_DFP,
693 /* option vector 4: IBM PAPR implementation */
694 VECTOR_LENGTH(2), /* length */
696 OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
698 /* option vector 5: PAPR/OF options */
699 VECTOR_LENGTH(21), /* length */
700 0, /* don't ignore, don't halt */
701 OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
702 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
703 #ifdef CONFIG_PCI_MSI
704 /* PCIe/MSI support. Without MSI full PCIe is not supported */
710 #ifdef CONFIG_PPC_SMLPAR
711 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
715 OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
719 /* WARNING: The offset of the "number of cores" field below
720 * must match by the macro below. Update the definition if
721 * the structure layout changes.
723 #define IBM_ARCH_VEC_NRCORES_OFFSET 133
724 W(NR_CPUS), /* number of cores supported */
729 OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) |
730 OV5_FEAT(OV5_PFO_HW_842), /* Byte 17 */
734 OV5_FEAT(OV5_SUB_PROCESSORS), /* Byte 21 */
736 /* option vector 6: IBM PAPR hints */
737 VECTOR_LENGTH(3), /* length */
743 /* Old method - ELF header with PT_NOTE sections only works on BE */
744 #ifdef __BIG_ENDIAN__
745 static struct fake_elf {
752 char name[8]; /* "PowerPC" */
766 char name[24]; /* "IBM,RPA-Client-Config" */
780 .e_ident = { 0x7f, 'E', 'L', 'F',
781 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
782 .e_type = ET_EXEC, /* yeah right */
784 .e_version = EV_CURRENT,
785 .e_phoff = offsetof(struct fake_elf, phdr),
786 .e_phentsize = sizeof(Elf32_Phdr),
792 .p_offset = offsetof(struct fake_elf, chrpnote),
793 .p_filesz = sizeof(struct chrpnote)
796 .p_offset = offsetof(struct fake_elf, rpanote),
797 .p_filesz = sizeof(struct rpanote)
801 .namesz = sizeof("PowerPC"),
802 .descsz = sizeof(struct chrpdesc),
806 .real_mode = ~0U, /* ~0 means "don't care" */
815 .namesz = sizeof("IBM,RPA-Client-Config"),
816 .descsz = sizeof(struct rpadesc),
818 .name = "IBM,RPA-Client-Config",
821 .min_rmo_size = 64, /* in megabytes */
822 .min_rmo_percent = 0,
823 .max_pft_size = 48, /* 2^48 bytes max PFT size */
830 #endif /* __BIG_ENDIAN__ */
832 static int __init prom_count_smt_threads(void)
838 /* Pick up th first CPU node we can find */
839 for (node = 0; prom_next_node(&node); ) {
841 prom_getprop(node, "device_type", type, sizeof(type));
843 if (strcmp(type, "cpu"))
846 * There is an entry for each smt thread, each entry being
847 * 4 bytes long. All cpus should have the same number of
848 * smt threads, so return after finding the first.
850 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
851 if (plen == PROM_ERROR)
854 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
857 if (plen < 1 || plen > 64) {
858 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
859 (unsigned long)plen);
864 prom_debug("No threads found, assuming 1 per core\n");
871 static void __init prom_send_capabilities(void)
876 unsigned char *ptcores;
878 root = call_prom("open", 1, 1, ADDR("/"));
880 /* We need to tell the FW about the number of cores we support.
882 * To do that, we count the number of threads on the first core
883 * (we assume this is the same for all cores) and use it to
887 /* The core value may start at an odd address. If such a word
888 * access is made at a cache line boundary, this leads to an
889 * exception which may not be handled at this time.
890 * Forcing a per byte access to avoid exception.
892 ptcores = &ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET];
894 cores |= ptcores[0] << 24;
895 cores |= ptcores[1] << 16;
896 cores |= ptcores[2] << 8;
898 if (cores != NR_CPUS) {
899 prom_printf("WARNING ! "
900 "ibm_architecture_vec structure inconsistent: %lu!\n",
903 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
904 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
906 ptcores[0] = (cores >> 24) & 0xff;
907 ptcores[1] = (cores >> 16) & 0xff;
908 ptcores[2] = (cores >> 8) & 0xff;
909 ptcores[3] = cores & 0xff;
912 /* try calling the ibm,client-architecture-support method */
913 prom_printf("Calling ibm,client-architecture-support...");
914 if (call_prom_ret("call-method", 3, 2, &ret,
915 ADDR("ibm,client-architecture-support"),
917 ADDR(ibm_architecture_vec)) == 0) {
918 /* the call exists... */
920 prom_printf("\nWARNING: ibm,client-architecture"
921 "-support call FAILED!\n");
922 call_prom("close", 1, 0, root);
923 prom_printf(" done\n");
926 call_prom("close", 1, 0, root);
927 prom_printf(" not implemented\n");
930 #ifdef __BIG_ENDIAN__
934 /* no ibm,client-architecture-support call, try the old way */
935 elfloader = call_prom("open", 1, 1,
936 ADDR("/packages/elf-loader"));
937 if (elfloader == 0) {
938 prom_printf("couldn't open /packages/elf-loader\n");
941 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
942 elfloader, ADDR(&fake_elf));
943 call_prom("close", 1, 0, elfloader);
945 #endif /* __BIG_ENDIAN__ */
947 #endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
950 * Memory allocation strategy... our layout is normally:
952 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
953 * rare cases, initrd might end up being before the kernel though.
954 * We assume this won't override the final kernel at 0, we have no
955 * provision to handle that in this version, but it should hopefully
958 * alloc_top is set to the top of RMO, eventually shrink down if the
961 * alloc_bottom is set to the top of kernel/initrd
963 * from there, allocations are done this way : rtas is allocated
964 * topmost, and the device-tree is allocated from the bottom. We try
965 * to grow the device-tree allocation as we progress. If we can't,
966 * then we fail, we don't currently have a facility to restart
967 * elsewhere, but that shouldn't be necessary.
969 * Note that calls to reserve_mem have to be done explicitly, memory
970 * allocated with either alloc_up or alloc_down isn't automatically
976 * Allocates memory in the RMO upward from the kernel/initrd
978 * When align is 0, this is a special case, it means to allocate in place
979 * at the current location of alloc_bottom or fail (that is basically
980 * extending the previous allocation). Used for the device-tree flattening
982 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
984 unsigned long base = alloc_bottom;
985 unsigned long addr = 0;
988 base = _ALIGN_UP(base, align);
989 prom_debug("alloc_up(%x, %x)\n", size, align);
991 prom_panic("alloc_up() called with mem not initialized\n");
994 base = _ALIGN_UP(alloc_bottom, align);
998 for(; (base + size) <= alloc_top;
999 base = _ALIGN_UP(base + 0x100000, align)) {
1000 prom_debug(" trying: 0x%x\n\r", base);
1001 addr = (unsigned long)prom_claim(base, size, 0);
1002 if (addr != PROM_ERROR && addr != 0)
1010 alloc_bottom = addr + size;
1012 prom_debug(" -> %x\n", addr);
1013 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1014 prom_debug(" alloc_top : %x\n", alloc_top);
1015 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1016 prom_debug(" rmo_top : %x\n", rmo_top);
1017 prom_debug(" ram_top : %x\n", ram_top);
1023 * Allocates memory downward, either from top of RMO, or if highmem
1024 * is set, from the top of RAM. Note that this one doesn't handle
1025 * failures. It does claim memory if highmem is not set.
1027 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1030 unsigned long base, addr = 0;
1032 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1033 highmem ? "(high)" : "(low)");
1035 prom_panic("alloc_down() called with mem not initialized\n");
1038 /* Carve out storage for the TCE table. */
1039 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1040 if (addr <= alloc_bottom)
1042 /* Will we bump into the RMO ? If yes, check out that we
1043 * didn't overlap existing allocations there, if we did,
1044 * we are dead, we must be the first in town !
1046 if (addr < rmo_top) {
1047 /* Good, we are first */
1048 if (alloc_top == rmo_top)
1049 alloc_top = rmo_top = addr;
1053 alloc_top_high = addr;
1057 base = _ALIGN_DOWN(alloc_top - size, align);
1058 for (; base > alloc_bottom;
1059 base = _ALIGN_DOWN(base - 0x100000, align)) {
1060 prom_debug(" trying: 0x%x\n\r", base);
1061 addr = (unsigned long)prom_claim(base, size, 0);
1062 if (addr != PROM_ERROR && addr != 0)
1071 prom_debug(" -> %x\n", addr);
1072 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1073 prom_debug(" alloc_top : %x\n", alloc_top);
1074 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1075 prom_debug(" rmo_top : %x\n", rmo_top);
1076 prom_debug(" ram_top : %x\n", ram_top);
1082 * Parse a "reg" cell
1084 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1087 unsigned long r = 0;
1089 /* Ignore more than 2 cells */
1090 while (s > sizeof(unsigned long) / 4) {
1094 r = be32_to_cpu(*p++);
1098 r |= be32_to_cpu(*(p++));
1106 * Very dumb function for adding to the memory reserve list, but
1107 * we don't need anything smarter at this point
1109 * XXX Eventually check for collisions. They should NEVER happen.
1110 * If problems seem to show up, it would be a good start to track
1113 static void __init reserve_mem(u64 base, u64 size)
1115 u64 top = base + size;
1116 unsigned long cnt = mem_reserve_cnt;
1121 /* We need to always keep one empty entry so that we
1122 * have our terminator with "size" set to 0 since we are
1123 * dumb and just copy this entire array to the boot params
1125 base = _ALIGN_DOWN(base, PAGE_SIZE);
1126 top = _ALIGN_UP(top, PAGE_SIZE);
1129 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1130 prom_panic("Memory reserve map exhausted !\n");
1131 mem_reserve_map[cnt].base = cpu_to_be64(base);
1132 mem_reserve_map[cnt].size = cpu_to_be64(size);
1133 mem_reserve_cnt = cnt + 1;
1137 * Initialize memory allocation mechanism, parse "memory" nodes and
1138 * obtain that way the top of memory and RMO to setup out local allocator
1140 static void __init prom_init_mem(void)
1143 char *path, type[64];
1150 * We iterate the memory nodes to find
1151 * 1) top of RMO (first node)
1154 val = cpu_to_be32(2);
1155 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1156 rac = be32_to_cpu(val);
1157 val = cpu_to_be32(1);
1158 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1159 rsc = be32_to_cpu(val);
1160 prom_debug("root_addr_cells: %x\n", rac);
1161 prom_debug("root_size_cells: %x\n", rsc);
1163 prom_debug("scanning memory:\n");
1164 path = prom_scratch;
1166 for (node = 0; prom_next_node(&node); ) {
1168 prom_getprop(node, "device_type", type, sizeof(type));
1172 * CHRP Longtrail machines have no device_type
1173 * on the memory node, so check the name instead...
1175 prom_getprop(node, "name", type, sizeof(type));
1177 if (strcmp(type, "memory"))
1180 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1181 if (plen > sizeof(regbuf)) {
1182 prom_printf("memory node too large for buffer !\n");
1183 plen = sizeof(regbuf);
1186 endp = p + (plen / sizeof(cell_t));
1189 memset(path, 0, PROM_SCRATCH_SIZE);
1190 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1191 prom_debug(" node %s :\n", path);
1192 #endif /* DEBUG_PROM */
1194 while ((endp - p) >= (rac + rsc)) {
1195 unsigned long base, size;
1197 base = prom_next_cell(rac, &p);
1198 size = prom_next_cell(rsc, &p);
1202 prom_debug(" %x %x\n", base, size);
1203 if (base == 0 && (of_platform & PLATFORM_LPAR))
1205 if ((base + size) > ram_top)
1206 ram_top = base + size;
1210 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1213 * If prom_memory_limit is set we reduce the upper limits *except* for
1214 * alloc_top_high. This must be the real top of RAM so we can put
1218 alloc_top_high = ram_top;
1220 if (prom_memory_limit) {
1221 if (prom_memory_limit <= alloc_bottom) {
1222 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1224 prom_memory_limit = 0;
1225 } else if (prom_memory_limit >= ram_top) {
1226 prom_printf("Ignoring mem=%x >= ram_top.\n",
1228 prom_memory_limit = 0;
1230 ram_top = prom_memory_limit;
1231 rmo_top = min(rmo_top, prom_memory_limit);
1236 * Setup our top alloc point, that is top of RMO or top of
1237 * segment 0 when running non-LPAR.
1238 * Some RS64 machines have buggy firmware where claims up at
1239 * 1GB fail. Cap at 768MB as a workaround.
1240 * Since 768MB is plenty of room, and we need to cap to something
1241 * reasonable on 32-bit, cap at 768MB on all machines.
1245 rmo_top = min(0x30000000ul, rmo_top);
1246 alloc_top = rmo_top;
1247 alloc_top_high = ram_top;
1250 * Check if we have an initrd after the kernel but still inside
1251 * the RMO. If we do move our bottom point to after it.
1253 if (prom_initrd_start &&
1254 prom_initrd_start < rmo_top &&
1255 prom_initrd_end > alloc_bottom)
1256 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1258 prom_printf("memory layout at init:\n");
1259 prom_printf(" memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1260 prom_printf(" alloc_bottom : %x\n", alloc_bottom);
1261 prom_printf(" alloc_top : %x\n", alloc_top);
1262 prom_printf(" alloc_top_hi : %x\n", alloc_top_high);
1263 prom_printf(" rmo_top : %x\n", rmo_top);
1264 prom_printf(" ram_top : %x\n", ram_top);
1267 static void __init prom_close_stdin(void)
1272 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1273 stdin = be32_to_cpu(val);
1274 call_prom("close", 1, 0, stdin);
1278 #ifdef CONFIG_PPC_POWERNV
1280 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1281 static u64 __initdata prom_opal_base;
1282 static u64 __initdata prom_opal_entry;
1286 * Allocate room for and instantiate OPAL
1288 static void __init prom_instantiate_opal(void)
1293 u64 size = 0, align = 0x10000;
1297 prom_debug("prom_instantiate_opal: start...\n");
1299 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1300 prom_debug("opal_node: %x\n", opal_node);
1301 if (!PHANDLE_VALID(opal_node))
1305 prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
1306 size = be64_to_cpu(val64);
1310 prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
1311 align = be64_to_cpu(val64);
1313 base = alloc_down(size, align, 0);
1315 prom_printf("OPAL allocation failed !\n");
1319 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1320 if (!IHANDLE_VALID(opal_inst)) {
1321 prom_printf("opening opal package failed (%x)\n", opal_inst);
1325 prom_printf("instantiating opal at 0x%x...", base);
1327 if (call_prom_ret("call-method", 4, 3, rets,
1328 ADDR("load-opal-runtime"),
1330 base >> 32, base & 0xffffffff) != 0
1331 || (rets[0] == 0 && rets[1] == 0)) {
1332 prom_printf(" failed\n");
1335 entry = (((u64)rets[0]) << 32) | rets[1];
1337 prom_printf(" done\n");
1339 reserve_mem(base, size);
1341 prom_debug("opal base = 0x%x\n", base);
1342 prom_debug("opal align = 0x%x\n", align);
1343 prom_debug("opal entry = 0x%x\n", entry);
1344 prom_debug("opal size = 0x%x\n", (long)size);
1346 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1347 &base, sizeof(base));
1348 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1349 &entry, sizeof(entry));
1351 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1352 prom_opal_base = base;
1353 prom_opal_entry = entry;
1355 prom_debug("prom_instantiate_opal: end...\n");
1358 #endif /* CONFIG_PPC_POWERNV */
1361 * Allocate room for and instantiate RTAS
1363 static void __init prom_instantiate_rtas(void)
1367 u32 base, entry = 0;
1371 prom_debug("prom_instantiate_rtas: start...\n");
1373 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1374 prom_debug("rtas_node: %x\n", rtas_node);
1375 if (!PHANDLE_VALID(rtas_node))
1379 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1380 size = be32_to_cpu(val);
1384 base = alloc_down(size, PAGE_SIZE, 0);
1386 prom_panic("Could not allocate memory for RTAS\n");
1388 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1389 if (!IHANDLE_VALID(rtas_inst)) {
1390 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1394 prom_printf("instantiating rtas at 0x%x...", base);
1396 if (call_prom_ret("call-method", 3, 2, &entry,
1397 ADDR("instantiate-rtas"),
1398 rtas_inst, base) != 0
1400 prom_printf(" failed\n");
1403 prom_printf(" done\n");
1405 reserve_mem(base, size);
1407 val = cpu_to_be32(base);
1408 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1410 val = cpu_to_be32(entry);
1411 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1414 /* Check if it supports "query-cpu-stopped-state" */
1415 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1416 &val, sizeof(val)) != PROM_ERROR)
1417 rtas_has_query_cpu_stopped = true;
1419 prom_debug("rtas base = 0x%x\n", base);
1420 prom_debug("rtas entry = 0x%x\n", entry);
1421 prom_debug("rtas size = 0x%x\n", (long)size);
1423 prom_debug("prom_instantiate_rtas: end...\n");
1428 * Allocate room for and instantiate Stored Measurement Log (SML)
1430 static void __init prom_instantiate_sml(void)
1432 phandle ibmvtpm_node;
1433 ihandle ibmvtpm_inst;
1434 u32 entry = 0, size = 0, succ = 0;
1438 prom_debug("prom_instantiate_sml: start...\n");
1440 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
1441 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1442 if (!PHANDLE_VALID(ibmvtpm_node))
1445 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
1446 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1447 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1451 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
1452 &val, sizeof(val)) != PROM_ERROR) {
1453 if (call_prom_ret("call-method", 2, 2, &succ,
1454 ADDR("reformat-sml-to-efi-alignment"),
1455 ibmvtpm_inst) != 0 || succ == 0) {
1456 prom_printf("Reformat SML to EFI alignment failed\n");
1460 if (call_prom_ret("call-method", 2, 2, &size,
1461 ADDR("sml-get-allocated-size"),
1462 ibmvtpm_inst) != 0 || size == 0) {
1463 prom_printf("SML get allocated size failed\n");
1467 if (call_prom_ret("call-method", 2, 2, &size,
1468 ADDR("sml-get-handover-size"),
1469 ibmvtpm_inst) != 0 || size == 0) {
1470 prom_printf("SML get handover size failed\n");
1475 base = alloc_down(size, PAGE_SIZE, 0);
1477 prom_panic("Could not allocate memory for sml\n");
1479 prom_printf("instantiating sml at 0x%x...", base);
1481 memset((void *)base, 0, size);
1483 if (call_prom_ret("call-method", 4, 2, &entry,
1484 ADDR("sml-handover"),
1485 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1486 prom_printf("SML handover failed\n");
1489 prom_printf(" done\n");
1491 reserve_mem(base, size);
1493 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
1494 &base, sizeof(base));
1495 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
1496 &size, sizeof(size));
1498 prom_debug("sml base = 0x%x\n", base);
1499 prom_debug("sml size = 0x%x\n", (long)size);
1501 prom_debug("prom_instantiate_sml: end...\n");
1505 * Allocate room for and initialize TCE tables
1507 #ifdef __BIG_ENDIAN__
1508 static void __init prom_initialize_tce_table(void)
1512 char compatible[64], type[64], model[64];
1513 char *path = prom_scratch;
1515 u32 minalign, minsize;
1516 u64 tce_entry, *tce_entryp;
1517 u64 local_alloc_top, local_alloc_bottom;
1523 prom_debug("starting prom_initialize_tce_table\n");
1525 /* Cache current top of allocs so we reserve a single block */
1526 local_alloc_top = alloc_top_high;
1527 local_alloc_bottom = local_alloc_top;
1529 /* Search all nodes looking for PHBs. */
1530 for (node = 0; prom_next_node(&node); ) {
1534 prom_getprop(node, "compatible",
1535 compatible, sizeof(compatible));
1536 prom_getprop(node, "device_type", type, sizeof(type));
1537 prom_getprop(node, "model", model, sizeof(model));
1539 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1542 /* Keep the old logic intact to avoid regression. */
1543 if (compatible[0] != 0) {
1544 if ((strstr(compatible, "python") == NULL) &&
1545 (strstr(compatible, "Speedwagon") == NULL) &&
1546 (strstr(compatible, "Winnipeg") == NULL))
1548 } else if (model[0] != 0) {
1549 if ((strstr(model, "ython") == NULL) &&
1550 (strstr(model, "peedwagon") == NULL) &&
1551 (strstr(model, "innipeg") == NULL))
1555 if (prom_getprop(node, "tce-table-minalign", &minalign,
1556 sizeof(minalign)) == PROM_ERROR)
1558 if (prom_getprop(node, "tce-table-minsize", &minsize,
1559 sizeof(minsize)) == PROM_ERROR)
1560 minsize = 4UL << 20;
1563 * Even though we read what OF wants, we just set the table
1564 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1565 * By doing this, we avoid the pitfalls of trying to DMA to
1566 * MMIO space and the DMA alias hole.
1568 * On POWER4, firmware sets the TCE region by assuming
1569 * each TCE table is 8MB. Using this memory for anything
1570 * else will impact performance, so we always allocate 8MB.
1573 if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
1574 minsize = 8UL << 20;
1576 minsize = 4UL << 20;
1578 /* Align to the greater of the align or size */
1579 align = max(minalign, minsize);
1580 base = alloc_down(minsize, align, 1);
1582 prom_panic("ERROR, cannot find space for TCE table.\n");
1583 if (base < local_alloc_bottom)
1584 local_alloc_bottom = base;
1586 /* It seems OF doesn't null-terminate the path :-( */
1587 memset(path, 0, PROM_SCRATCH_SIZE);
1588 /* Call OF to setup the TCE hardware */
1589 if (call_prom("package-to-path", 3, 1, node,
1590 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1591 prom_printf("package-to-path failed\n");
1594 /* Save away the TCE table attributes for later use. */
1595 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1596 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1598 prom_debug("TCE table: %s\n", path);
1599 prom_debug("\tnode = 0x%x\n", node);
1600 prom_debug("\tbase = 0x%x\n", base);
1601 prom_debug("\tsize = 0x%x\n", minsize);
1603 /* Initialize the table to have a one-to-one mapping
1604 * over the allocated size.
1606 tce_entryp = (u64 *)base;
1607 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1608 tce_entry = (i << PAGE_SHIFT);
1610 *tce_entryp = tce_entry;
1613 prom_printf("opening PHB %s", path);
1614 phb_node = call_prom("open", 1, 1, path);
1616 prom_printf("... failed\n");
1618 prom_printf("... done\n");
1620 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1621 phb_node, -1, minsize,
1622 (u32) base, (u32) (base >> 32));
1623 call_prom("close", 1, 0, phb_node);
1626 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1628 /* These are only really needed if there is a memory limit in
1629 * effect, but we don't know so export them always. */
1630 prom_tce_alloc_start = local_alloc_bottom;
1631 prom_tce_alloc_end = local_alloc_top;
1633 /* Flag the first invalid entry */
1634 prom_debug("ending prom_initialize_tce_table\n");
1636 #endif /* __BIG_ENDIAN__ */
1637 #endif /* CONFIG_PPC64 */
1640 * With CHRP SMP we need to use the OF to start the other processors.
1641 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1642 * so we have to put the processors into a holding pattern controlled
1643 * by the kernel (not OF) before we destroy the OF.
1645 * This uses a chunk of low memory, puts some holding pattern
1646 * code there and sends the other processors off to there until
1647 * smp_boot_cpus tells them to do something. The holding pattern
1648 * checks that address until its cpu # is there, when it is that
1649 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1650 * of setting those values.
1652 * We also use physical address 0x4 here to tell when a cpu
1653 * is in its holding pattern code.
1658 * We want to reference the copy of __secondary_hold_* in the
1659 * 0 - 0x100 address range
1661 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1663 static void __init prom_hold_cpus(void)
1668 unsigned long *spinloop
1669 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1670 unsigned long *acknowledge
1671 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1672 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1675 * On pseries, if RTAS supports "query-cpu-stopped-state",
1676 * we skip this stage, the CPUs will be started by the
1677 * kernel using RTAS.
1679 if ((of_platform == PLATFORM_PSERIES ||
1680 of_platform == PLATFORM_PSERIES_LPAR) &&
1681 rtas_has_query_cpu_stopped) {
1682 prom_printf("prom_hold_cpus: skipped\n");
1686 prom_debug("prom_hold_cpus: start...\n");
1687 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1688 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1689 prom_debug(" 1) acknowledge = 0x%x\n",
1690 (unsigned long)acknowledge);
1691 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1692 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1694 /* Set the common spinloop variable, so all of the secondary cpus
1695 * will block when they are awakened from their OF spinloop.
1696 * This must occur for both SMP and non SMP kernels, since OF will
1697 * be trashed when we move the kernel.
1702 for (node = 0; prom_next_node(&node); ) {
1703 unsigned int cpu_no;
1707 prom_getprop(node, "device_type", type, sizeof(type));
1708 if (strcmp(type, "cpu") != 0)
1711 /* Skip non-configured cpus. */
1712 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1713 if (strcmp(type, "okay") != 0)
1716 reg = cpu_to_be32(-1); /* make sparse happy */
1717 prom_getprop(node, "reg", ®, sizeof(reg));
1718 cpu_no = be32_to_cpu(reg);
1720 prom_debug("cpu hw idx = %lu\n", cpu_no);
1722 /* Init the acknowledge var which will be reset by
1723 * the secondary cpu when it awakens from its OF
1726 *acknowledge = (unsigned long)-1;
1728 if (cpu_no != prom.cpu) {
1729 /* Primary Thread of non-boot cpu or any thread */
1730 prom_printf("starting cpu hw idx %lu... ", cpu_no);
1731 call_prom("start-cpu", 3, 0, node,
1732 secondary_hold, cpu_no);
1734 for (i = 0; (i < 100000000) &&
1735 (*acknowledge == ((unsigned long)-1)); i++ )
1738 if (*acknowledge == cpu_no)
1739 prom_printf("done\n");
1741 prom_printf("failed: %x\n", *acknowledge);
1745 prom_printf("boot cpu hw idx %lu\n", cpu_no);
1746 #endif /* CONFIG_SMP */
1749 prom_debug("prom_hold_cpus: end...\n");
1753 static void __init prom_init_client_services(unsigned long pp)
1755 /* Get a handle to the prom entry point before anything else */
1758 /* get a handle for the stdout device */
1759 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1760 if (!PHANDLE_VALID(prom.chosen))
1761 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1763 /* get device tree root */
1764 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
1765 if (!PHANDLE_VALID(prom.root))
1766 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1773 * For really old powermacs, we need to map things we claim.
1774 * For that, we need the ihandle of the mmu.
1775 * Also, on the longtrail, we need to work around other bugs.
1777 static void __init prom_find_mmu(void)
1782 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1783 if (!PHANDLE_VALID(oprom))
1785 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1787 version[sizeof(version) - 1] = 0;
1788 /* XXX might need to add other versions here */
1789 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1790 of_workarounds = OF_WA_CLAIM;
1791 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1792 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1793 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1796 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
1797 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
1798 sizeof(prom.mmumap));
1799 prom.mmumap = be32_to_cpu(prom.mmumap);
1800 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
1801 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1804 #define prom_find_mmu()
1807 static void __init prom_init_stdout(void)
1809 char *path = of_stdout_device;
1811 phandle stdout_node;
1814 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
1815 prom_panic("cannot find stdout");
1817 prom.stdout = be32_to_cpu(val);
1819 /* Get the full OF pathname of the stdout device */
1820 memset(path, 0, 256);
1821 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
1822 prom_printf("OF stdout device is: %s\n", of_stdout_device);
1823 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
1824 path, strlen(path) + 1);
1826 /* instance-to-package fails on PA-Semi */
1827 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
1828 if (stdout_node != PROM_ERROR) {
1829 val = cpu_to_be32(stdout_node);
1830 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
1833 /* If it's a display, note it */
1834 memset(type, 0, sizeof(type));
1835 prom_getprop(stdout_node, "device_type", type, sizeof(type));
1836 if (strcmp(type, "display") == 0)
1837 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
1841 static int __init prom_find_machine_type(void)
1850 /* Look for a PowerMac or a Cell */
1851 len = prom_getprop(prom.root, "compatible",
1852 compat, sizeof(compat)-1);
1856 char *p = &compat[i];
1860 if (strstr(p, "Power Macintosh") ||
1861 strstr(p, "MacRISC"))
1862 return PLATFORM_POWERMAC;
1864 /* We must make sure we don't detect the IBM Cell
1865 * blades as pSeries due to some firmware issues,
1868 if (strstr(p, "IBM,CBEA") ||
1869 strstr(p, "IBM,CPBW-1.0"))
1870 return PLATFORM_GENERIC;
1871 #endif /* CONFIG_PPC64 */
1876 /* Try to detect OPAL */
1877 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
1878 return PLATFORM_OPAL;
1880 /* Try to figure out if it's an IBM pSeries or any other
1881 * PAPR compliant platform. We assume it is if :
1882 * - /device_type is "chrp" (please, do NOT use that for future
1886 len = prom_getprop(prom.root, "device_type",
1887 compat, sizeof(compat)-1);
1889 return PLATFORM_GENERIC;
1890 if (strcmp(compat, "chrp"))
1891 return PLATFORM_GENERIC;
1893 /* Default to pSeries. We need to know if we are running LPAR */
1894 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1895 if (!PHANDLE_VALID(rtas))
1896 return PLATFORM_GENERIC;
1897 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1898 if (x != PROM_ERROR) {
1899 prom_debug("Hypertas detected, assuming LPAR !\n");
1900 return PLATFORM_PSERIES_LPAR;
1902 return PLATFORM_PSERIES;
1904 return PLATFORM_GENERIC;
1908 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1910 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1914 * If we have a display that we don't know how to drive,
1915 * we will want to try to execute OF's open method for it
1916 * later. However, OF will probably fall over if we do that
1917 * we've taken over the MMU.
1918 * So we check whether we will need to open the display,
1919 * and if so, open it now.
1921 static void __init prom_check_displays(void)
1923 char type[16], *path;
1928 static unsigned char default_colors[] = {
1946 const unsigned char *clut;
1948 prom_debug("Looking for displays\n");
1949 for (node = 0; prom_next_node(&node); ) {
1950 memset(type, 0, sizeof(type));
1951 prom_getprop(node, "device_type", type, sizeof(type));
1952 if (strcmp(type, "display") != 0)
1955 /* It seems OF doesn't null-terminate the path :-( */
1956 path = prom_scratch;
1957 memset(path, 0, PROM_SCRATCH_SIZE);
1960 * leave some room at the end of the path for appending extra
1963 if (call_prom("package-to-path", 3, 1, node, path,
1964 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1966 prom_printf("found display : %s, opening... ", path);
1968 ih = call_prom("open", 1, 1, path);
1970 prom_printf("failed\n");
1975 prom_printf("done\n");
1976 prom_setprop(node, path, "linux,opened", NULL, 0);
1978 /* Setup a usable color table when the appropriate
1979 * method is available. Should update this to set-colors */
1980 clut = default_colors;
1981 for (i = 0; i < 16; i++, clut += 3)
1982 if (prom_set_color(ih, i, clut[0], clut[1],
1986 #ifdef CONFIG_LOGO_LINUX_CLUT224
1987 clut = PTRRELOC(logo_linux_clut224.clut);
1988 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
1989 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1992 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1994 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
1995 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
1997 u32 width, height, pitch, addr;
1999 prom_printf("Setting btext !\n");
2000 prom_getprop(node, "width", &width, 4);
2001 prom_getprop(node, "height", &height, 4);
2002 prom_getprop(node, "linebytes", &pitch, 4);
2003 prom_getprop(node, "address", &addr, 4);
2004 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2005 width, height, pitch, addr);
2006 btext_setup_display(width, height, 8, pitch, addr);
2008 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2013 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2014 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2015 unsigned long needed, unsigned long align)
2019 *mem_start = _ALIGN(*mem_start, align);
2020 while ((*mem_start + needed) > *mem_end) {
2021 unsigned long room, chunk;
2023 prom_debug("Chunk exhausted, claiming more at %x...\n",
2025 room = alloc_top - alloc_bottom;
2026 if (room > DEVTREE_CHUNK_SIZE)
2027 room = DEVTREE_CHUNK_SIZE;
2028 if (room < PAGE_SIZE)
2029 prom_panic("No memory for flatten_device_tree "
2031 chunk = alloc_up(room, 0);
2033 prom_panic("No memory for flatten_device_tree "
2034 "(claim failed)\n");
2035 *mem_end = chunk + room;
2038 ret = (void *)*mem_start;
2039 *mem_start += needed;
2044 #define dt_push_token(token, mem_start, mem_end) do { \
2045 void *room = make_room(mem_start, mem_end, 4, 4); \
2046 *(__be32 *)room = cpu_to_be32(token); \
2049 static unsigned long __init dt_find_string(char *str)
2053 s = os = (char *)dt_string_start;
2055 while (s < (char *)dt_string_end) {
2056 if (strcmp(s, str) == 0)
2064 * The Open Firmware 1275 specification states properties must be 31 bytes or
2065 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2067 #define MAX_PROPERTY_NAME 64
2069 static void __init scan_dt_build_strings(phandle node,
2070 unsigned long *mem_start,
2071 unsigned long *mem_end)
2073 char *prev_name, *namep, *sstart;
2077 sstart = (char *)dt_string_start;
2079 /* get and store all property names */
2082 /* 64 is max len of name including nul. */
2083 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2084 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2085 /* No more nodes: unwind alloc */
2086 *mem_start = (unsigned long)namep;
2091 if (strcmp(namep, "name") == 0) {
2092 *mem_start = (unsigned long)namep;
2096 /* get/create string entry */
2097 soff = dt_find_string(namep);
2099 *mem_start = (unsigned long)namep;
2100 namep = sstart + soff;
2102 /* Trim off some if we can */
2103 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2104 dt_string_end = *mem_start;
2109 /* do all our children */
2110 child = call_prom("child", 1, 1, node);
2111 while (child != 0) {
2112 scan_dt_build_strings(child, mem_start, mem_end);
2113 child = call_prom("peer", 1, 1, child);
2117 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2118 unsigned long *mem_end)
2121 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2123 unsigned char *valp;
2124 static char pname[MAX_PROPERTY_NAME];
2125 int l, room, has_phandle = 0;
2127 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2129 /* get the node's full name */
2130 namep = (char *)*mem_start;
2131 room = *mem_end - *mem_start;
2134 l = call_prom("package-to-path", 3, 1, node, namep, room);
2136 /* Didn't fit? Get more room. */
2138 if (l >= *mem_end - *mem_start)
2139 namep = make_room(mem_start, mem_end, l+1, 1);
2140 call_prom("package-to-path", 3, 1, node, namep, l);
2144 /* Fixup an Apple bug where they have bogus \0 chars in the
2145 * middle of the path in some properties, and extract
2146 * the unit name (everything after the last '/').
2148 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2155 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2158 /* get it again for debugging */
2159 path = prom_scratch;
2160 memset(path, 0, PROM_SCRATCH_SIZE);
2161 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2163 /* get and store all properties */
2165 sstart = (char *)dt_string_start;
2167 if (call_prom("nextprop", 3, 1, node, prev_name,
2172 if (strcmp(pname, "name") == 0) {
2177 /* find string offset */
2178 soff = dt_find_string(pname);
2180 prom_printf("WARNING: Can't find string index for"
2181 " <%s>, node %s\n", pname, path);
2184 prev_name = sstart + soff;
2187 l = call_prom("getproplen", 2, 1, node, pname);
2190 if (l == PROM_ERROR)
2193 /* push property head */
2194 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2195 dt_push_token(l, mem_start, mem_end);
2196 dt_push_token(soff, mem_start, mem_end);
2198 /* push property content */
2199 valp = make_room(mem_start, mem_end, l, 4);
2200 call_prom("getprop", 4, 1, node, pname, valp, l);
2201 *mem_start = _ALIGN(*mem_start, 4);
2203 if (!strcmp(pname, "phandle"))
2207 /* Add a "linux,phandle" property if no "phandle" property already
2208 * existed (can happen with OPAL)
2211 soff = dt_find_string("linux,phandle");
2213 prom_printf("WARNING: Can't find string index for"
2214 " <linux-phandle> node %s\n", path);
2216 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2217 dt_push_token(4, mem_start, mem_end);
2218 dt_push_token(soff, mem_start, mem_end);
2219 valp = make_room(mem_start, mem_end, 4, 4);
2220 *(__be32 *)valp = cpu_to_be32(node);
2224 /* do all our children */
2225 child = call_prom("child", 1, 1, node);
2226 while (child != 0) {
2227 scan_dt_build_struct(child, mem_start, mem_end);
2228 child = call_prom("peer", 1, 1, child);
2231 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2234 static void __init flatten_device_tree(void)
2237 unsigned long mem_start, mem_end, room;
2238 struct boot_param_header *hdr;
2243 * Check how much room we have between alloc top & bottom (+/- a
2244 * few pages), crop to 1MB, as this is our "chunk" size
2246 room = alloc_top - alloc_bottom - 0x4000;
2247 if (room > DEVTREE_CHUNK_SIZE)
2248 room = DEVTREE_CHUNK_SIZE;
2249 prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2251 /* Now try to claim that */
2252 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2254 prom_panic("Can't allocate initial device-tree chunk\n");
2255 mem_end = mem_start + room;
2257 /* Get root of tree */
2258 root = call_prom("peer", 1, 1, (phandle)0);
2259 if (root == (phandle)0)
2260 prom_panic ("couldn't get device tree root\n");
2262 /* Build header and make room for mem rsv map */
2263 mem_start = _ALIGN(mem_start, 4);
2264 hdr = make_room(&mem_start, &mem_end,
2265 sizeof(struct boot_param_header), 4);
2266 dt_header_start = (unsigned long)hdr;
2267 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2269 /* Start of strings */
2270 mem_start = PAGE_ALIGN(mem_start);
2271 dt_string_start = mem_start;
2272 mem_start += 4; /* hole */
2274 /* Add "linux,phandle" in there, we'll need it */
2275 namep = make_room(&mem_start, &mem_end, 16, 1);
2276 strcpy(namep, "linux,phandle");
2277 mem_start = (unsigned long)namep + strlen(namep) + 1;
2279 /* Build string array */
2280 prom_printf("Building dt strings...\n");
2281 scan_dt_build_strings(root, &mem_start, &mem_end);
2282 dt_string_end = mem_start;
2284 /* Build structure */
2285 mem_start = PAGE_ALIGN(mem_start);
2286 dt_struct_start = mem_start;
2287 prom_printf("Building dt structure...\n");
2288 scan_dt_build_struct(root, &mem_start, &mem_end);
2289 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2290 dt_struct_end = PAGE_ALIGN(mem_start);
2293 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2294 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2295 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2296 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2297 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2298 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2299 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2300 hdr->version = cpu_to_be32(OF_DT_VERSION);
2301 /* Version 16 is not backward compatible */
2302 hdr->last_comp_version = cpu_to_be32(0x10);
2304 /* Copy the reserve map in */
2305 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2310 prom_printf("reserved memory map:\n");
2311 for (i = 0; i < mem_reserve_cnt; i++)
2312 prom_printf(" %x - %x\n",
2313 be64_to_cpu(mem_reserve_map[i].base),
2314 be64_to_cpu(mem_reserve_map[i].size));
2317 /* Bump mem_reserve_cnt to cause further reservations to fail
2318 * since it's too late.
2320 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2322 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2323 dt_string_start, dt_string_end);
2324 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2325 dt_struct_start, dt_struct_end);
2328 #ifdef CONFIG_PPC_MAPLE
2329 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2330 * The values are bad, and it doesn't even have the right number of cells. */
2331 static void __init fixup_device_tree_maple(void)
2334 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2338 name = "/ht@0/isa@4";
2339 isa = call_prom("finddevice", 1, 1, ADDR(name));
2340 if (!PHANDLE_VALID(isa)) {
2341 name = "/ht@0/isa@6";
2342 isa = call_prom("finddevice", 1, 1, ADDR(name));
2343 rloc = 0x01003000; /* IO space; PCI device = 6 */
2345 if (!PHANDLE_VALID(isa))
2348 if (prom_getproplen(isa, "ranges") != 12)
2350 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2354 if (isa_ranges[0] != 0x1 ||
2355 isa_ranges[1] != 0xf4000000 ||
2356 isa_ranges[2] != 0x00010000)
2359 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2361 isa_ranges[0] = 0x1;
2362 isa_ranges[1] = 0x0;
2363 isa_ranges[2] = rloc;
2364 isa_ranges[3] = 0x0;
2365 isa_ranges[4] = 0x0;
2366 isa_ranges[5] = 0x00010000;
2367 prom_setprop(isa, name, "ranges",
2368 isa_ranges, sizeof(isa_ranges));
2371 #define CPC925_MC_START 0xf8000000
2372 #define CPC925_MC_LENGTH 0x1000000
2373 /* The values for memory-controller don't have right number of cells */
2374 static void __init fixup_device_tree_maple_memory_controller(void)
2378 char *name = "/hostbridge@f8000000";
2381 mc = call_prom("finddevice", 1, 1, ADDR(name));
2382 if (!PHANDLE_VALID(mc))
2385 if (prom_getproplen(mc, "reg") != 8)
2388 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2389 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2390 if ((ac != 2) || (sc != 2))
2393 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2396 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2399 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2402 mc_reg[1] = CPC925_MC_START;
2404 mc_reg[3] = CPC925_MC_LENGTH;
2405 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2408 #define fixup_device_tree_maple()
2409 #define fixup_device_tree_maple_memory_controller()
2412 #ifdef CONFIG_PPC_CHRP
2414 * Pegasos and BriQ lacks the "ranges" property in the isa node
2415 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2416 * Pegasos has the IDE configured in legacy mode, but advertised as native
2418 static void __init fixup_device_tree_chrp(void)
2422 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2426 name = "/pci@80000000/isa@c";
2427 ph = call_prom("finddevice", 1, 1, ADDR(name));
2428 if (!PHANDLE_VALID(ph)) {
2429 name = "/pci@ff500000/isa@6";
2430 ph = call_prom("finddevice", 1, 1, ADDR(name));
2431 rloc = 0x01003000; /* IO space; PCI device = 6 */
2433 if (PHANDLE_VALID(ph)) {
2434 rc = prom_getproplen(ph, "ranges");
2435 if (rc == 0 || rc == PROM_ERROR) {
2436 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2443 prop[5] = 0x00010000;
2444 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2448 name = "/pci@80000000/ide@C,1";
2449 ph = call_prom("finddevice", 1, 1, ADDR(name));
2450 if (PHANDLE_VALID(ph)) {
2451 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2454 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2455 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2456 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2457 if (rc == sizeof(u32)) {
2459 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2464 #define fixup_device_tree_chrp()
2467 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2468 static void __init fixup_device_tree_pmac(void)
2470 phandle u3, i2c, mpic;
2475 /* Some G5s have a missing interrupt definition, fix it up here */
2476 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2477 if (!PHANDLE_VALID(u3))
2479 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2480 if (!PHANDLE_VALID(i2c))
2482 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2483 if (!PHANDLE_VALID(mpic))
2486 /* check if proper rev of u3 */
2487 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2490 if (u3_rev < 0x35 || u3_rev > 0x39)
2492 /* does it need fixup ? */
2493 if (prom_getproplen(i2c, "interrupts") > 0)
2496 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2498 /* interrupt on this revision of u3 is number 0 and level */
2501 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2502 &interrupts, sizeof(interrupts));
2504 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2505 &parent, sizeof(parent));
2508 #define fixup_device_tree_pmac()
2511 #ifdef CONFIG_PPC_EFIKA
2513 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2514 * to talk to the phy. If the phy-handle property is missing, then this
2515 * function is called to add the appropriate nodes and link it to the
2518 static void __init fixup_device_tree_efika_add_phy(void)
2524 /* Check if /builtin/ethernet exists - bail if it doesn't */
2525 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2526 if (!PHANDLE_VALID(node))
2529 /* Check if the phy-handle property exists - bail if it does */
2530 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2535 * At this point the ethernet device doesn't have a phy described.
2536 * Now we need to add the missing phy node and linkage
2539 /* Check for an MDIO bus node - if missing then create one */
2540 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2541 if (!PHANDLE_VALID(node)) {
2542 prom_printf("Adding Ethernet MDIO node\n");
2543 call_prom("interpret", 1, 1,
2544 " s\" /builtin\" find-device"
2546 " 1 encode-int s\" #address-cells\" property"
2547 " 0 encode-int s\" #size-cells\" property"
2548 " s\" mdio\" device-name"
2549 " s\" fsl,mpc5200b-mdio\" encode-string"
2550 " s\" compatible\" property"
2551 " 0xf0003000 0x400 reg"
2553 " 0x5 encode-int encode+"
2554 " 0x3 encode-int encode+"
2555 " s\" interrupts\" property"
2559 /* Check for a PHY device node - if missing then create one and
2560 * give it's phandle to the ethernet node */
2561 node = call_prom("finddevice", 1, 1,
2562 ADDR("/builtin/mdio/ethernet-phy"));
2563 if (!PHANDLE_VALID(node)) {
2564 prom_printf("Adding Ethernet PHY node\n");
2565 call_prom("interpret", 1, 1,
2566 " s\" /builtin/mdio\" find-device"
2568 " s\" ethernet-phy\" device-name"
2569 " 0x10 encode-int s\" reg\" property"
2573 " s\" /builtin/ethernet\" find-device"
2575 " s\" phy-handle\" property"
2580 static void __init fixup_device_tree_efika(void)
2582 int sound_irq[3] = { 2, 2, 0 };
2583 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2584 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2585 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2586 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2591 /* Check if we're really running on a EFIKA */
2592 node = call_prom("finddevice", 1, 1, ADDR("/"));
2593 if (!PHANDLE_VALID(node))
2596 rv = prom_getprop(node, "model", prop, sizeof(prop));
2597 if (rv == PROM_ERROR)
2599 if (strcmp(prop, "EFIKA5K2"))
2602 prom_printf("Applying EFIKA device tree fixups\n");
2604 /* Claiming to be 'chrp' is death */
2605 node = call_prom("finddevice", 1, 1, ADDR("/"));
2606 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2607 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2608 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2610 /* CODEGEN,description is exposed in /proc/cpuinfo so
2612 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2613 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2614 prom_setprop(node, "/", "CODEGEN,description",
2615 "Efika 5200B PowerPC System",
2616 sizeof("Efika 5200B PowerPC System"));
2618 /* Fixup bestcomm interrupts property */
2619 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2620 if (PHANDLE_VALID(node)) {
2621 len = prom_getproplen(node, "interrupts");
2623 prom_printf("Fixing bestcomm interrupts property\n");
2624 prom_setprop(node, "/builtin/bestcom", "interrupts",
2625 bcomm_irq, sizeof(bcomm_irq));
2629 /* Fixup sound interrupts property */
2630 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2631 if (PHANDLE_VALID(node)) {
2632 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2633 if (rv == PROM_ERROR) {
2634 prom_printf("Adding sound interrupts property\n");
2635 prom_setprop(node, "/builtin/sound", "interrupts",
2636 sound_irq, sizeof(sound_irq));
2640 /* Make sure ethernet phy-handle property exists */
2641 fixup_device_tree_efika_add_phy();
2644 #define fixup_device_tree_efika()
2647 #ifdef CONFIG_PPC_PASEMI_NEMO
2649 * CFE supplied on Nemo is broken in several ways, biggest
2650 * problem is that it reassigns ISA interrupts to unused mpic ints.
2651 * Add an interrupt-controller property for the io-bridge to use
2652 * and correct the ints so we can attach them to an irq_domain
2654 static void __init fixup_device_tree_pasemi(void)
2656 u32 interrupts[2], parent, rval, val = 0;
2657 char *name, *pci_name;
2660 /* Find the root pci node */
2661 name = "/pxp@0,e0000000";
2662 iob = call_prom("finddevice", 1, 1, ADDR(name));
2663 if (!PHANDLE_VALID(iob))
2666 /* check if interrupt-controller node set yet */
2667 if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
2670 prom_printf("adding interrupt-controller property for SB600...\n");
2672 prom_setprop(iob, name, "interrupt-controller", &val, 0);
2674 pci_name = "/pxp@0,e0000000/pci@11";
2675 node = call_prom("finddevice", 1, 1, ADDR(pci_name));
2678 for( ; prom_next_node(&node); ) {
2679 /* scan each node for one with an interrupt */
2680 if (!PHANDLE_VALID(node))
2683 rval = prom_getproplen(node, "interrupts");
2684 if (rval == 0 || rval == PROM_ERROR)
2687 prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts));
2688 if ((interrupts[0] < 212) || (interrupts[0] > 222))
2691 /* found a node, update both interrupts and interrupt-parent */
2692 if ((interrupts[0] >= 212) && (interrupts[0] <= 215))
2693 interrupts[0] -= 203;
2694 if ((interrupts[0] >= 216) && (interrupts[0] <= 220))
2695 interrupts[0] -= 213;
2696 if (interrupts[0] == 221)
2698 if (interrupts[0] == 222)
2701 prom_setprop(node, pci_name, "interrupts", interrupts,
2702 sizeof(interrupts));
2703 prom_setprop(node, pci_name, "interrupt-parent", &parent,
2708 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'
2709 * so that generic isa-bridge code can add the SB600 and its on-board
2712 name = "/pxp@0,e0000000/io-bridge@0";
2713 iob = call_prom("finddevice", 1, 1, ADDR(name));
2714 if (!PHANDLE_VALID(iob))
2717 /* device_type is already set, just change it. */
2719 prom_printf("Changing device_type of SB600 node...\n");
2721 prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
2723 #else /* !CONFIG_PPC_PASEMI_NEMO */
2724 static inline void fixup_device_tree_pasemi(void) { }
2727 static void __init fixup_device_tree(void)
2729 fixup_device_tree_maple();
2730 fixup_device_tree_maple_memory_controller();
2731 fixup_device_tree_chrp();
2732 fixup_device_tree_pmac();
2733 fixup_device_tree_efika();
2734 fixup_device_tree_pasemi();
2737 static void __init prom_find_boot_cpu(void)
2744 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
2746 prom_cpu = be32_to_cpu(rval);
2748 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2750 if (!PHANDLE_VALID(cpu_pkg))
2753 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
2754 prom.cpu = be32_to_cpu(rval);
2756 prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
2759 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2761 #ifdef CONFIG_BLK_DEV_INITRD
2762 if (r3 && r4 && r4 != 0xdeadbeef) {
2765 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
2766 prom_initrd_end = prom_initrd_start + r4;
2768 val = cpu_to_be64(prom_initrd_start);
2769 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
2771 val = cpu_to_be64(prom_initrd_end);
2772 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
2775 reserve_mem(prom_initrd_start,
2776 prom_initrd_end - prom_initrd_start);
2778 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
2779 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
2781 #endif /* CONFIG_BLK_DEV_INITRD */
2785 #ifdef CONFIG_RELOCATABLE
2786 static void reloc_toc(void)
2790 static void unreloc_toc(void)
2794 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
2797 unsigned long *toc_entry;
2799 /* Get the start of the TOC by using r2 directly. */
2800 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
2802 for (i = 0; i < nr_entries; i++) {
2803 *toc_entry = *toc_entry + offset;
2808 static void reloc_toc(void)
2810 unsigned long offset = reloc_offset();
2811 unsigned long nr_entries =
2812 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2814 __reloc_toc(offset, nr_entries);
2819 static void unreloc_toc(void)
2821 unsigned long offset = reloc_offset();
2822 unsigned long nr_entries =
2823 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2827 __reloc_toc(-offset, nr_entries);
2833 * We enter here early on, when the Open Firmware prom is still
2834 * handling exceptions and the MMU hash table for us.
2837 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2839 unsigned long r6, unsigned long r7,
2840 unsigned long kbase)
2845 unsigned long offset = reloc_offset();
2852 * First zero the BSS
2854 memset(&__bss_start, 0, __bss_stop - __bss_start);
2857 * Init interface to Open Firmware, get some node references,
2860 prom_init_client_services(pp);
2863 * See if this OF is old enough that we need to do explicit maps
2864 * and other workarounds
2869 * Init prom stdout device
2873 prom_printf("Preparing to boot %s", linux_banner);
2876 * Get default machine type. At this point, we do not differentiate
2877 * between pSeries SMP and pSeries LPAR
2879 of_platform = prom_find_machine_type();
2880 prom_printf("Detected machine type: %x\n", of_platform);
2882 #ifndef CONFIG_NONSTATIC_KERNEL
2883 /* Bail if this is a kdump kernel. */
2884 if (PHYSICAL_START > 0)
2885 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2889 * Check for an initrd
2891 prom_check_initrd(r3, r4);
2893 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2895 * On pSeries, inform the firmware about our capabilities
2897 if (of_platform == PLATFORM_PSERIES ||
2898 of_platform == PLATFORM_PSERIES_LPAR)
2899 prom_send_capabilities();
2903 * Copy the CPU hold code
2905 if (of_platform != PLATFORM_POWERMAC)
2906 copy_and_flush(0, kbase, 0x100, 0);
2909 * Do early parsing of command line
2911 early_cmdline_parse();
2914 * Initialize memory management within prom_init
2919 * Determine which cpu is actually running right _now_
2921 prom_find_boot_cpu();
2924 * Initialize display devices
2926 prom_check_displays();
2928 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
2930 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2931 * that uses the allocator, we need to make sure we get the top of memory
2932 * available for us here...
2934 if (of_platform == PLATFORM_PSERIES)
2935 prom_initialize_tce_table();
2939 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2940 * have a usable RTAS implementation.
2942 if (of_platform != PLATFORM_POWERMAC &&
2943 of_platform != PLATFORM_OPAL)
2944 prom_instantiate_rtas();
2946 #ifdef CONFIG_PPC_POWERNV
2947 if (of_platform == PLATFORM_OPAL)
2948 prom_instantiate_opal();
2949 #endif /* CONFIG_PPC_POWERNV */
2952 /* instantiate sml */
2953 prom_instantiate_sml();
2957 * On non-powermacs, put all CPUs in spin-loops.
2959 * PowerMacs use a different mechanism to spin CPUs
2961 * (This must be done after instanciating RTAS)
2963 if (of_platform != PLATFORM_POWERMAC &&
2964 of_platform != PLATFORM_OPAL)
2968 * Fill in some infos for use by the kernel later on
2970 if (prom_memory_limit) {
2971 __be64 val = cpu_to_be64(prom_memory_limit);
2972 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
2977 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
2980 if (prom_iommu_force_on)
2981 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
2984 if (prom_tce_alloc_start) {
2985 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
2986 &prom_tce_alloc_start,
2987 sizeof(prom_tce_alloc_start));
2988 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
2989 &prom_tce_alloc_end,
2990 sizeof(prom_tce_alloc_end));
2995 * Fixup any known bugs in the device-tree
2997 fixup_device_tree();
3000 * Now finally create the flattened device-tree
3002 prom_printf("copying OF device tree...\n");
3003 flatten_device_tree();
3006 * in case stdin is USB and still active on IBM machines...
3007 * Unfortunately quiesce crashes on some powermacs if we have
3008 * closed stdin already (in particular the powerbook 101). It
3009 * appears that the OPAL version of OFW doesn't like it either.
3011 if (of_platform != PLATFORM_POWERMAC &&
3012 of_platform != PLATFORM_OPAL)
3016 * Call OF "quiesce" method to shut down pending DMA's from
3019 prom_printf("Quiescing Open Firmware ...\n");
3020 call_prom("quiesce", 0, 0);
3023 * And finally, call the kernel passing it the flattened device
3024 * tree and NULL as r5, thus triggering the new entry point which
3025 * is common to us and kexec
3027 hdr = dt_header_start;
3029 /* Don't print anything after quiesce under OPAL, it crashes OFW */
3030 if (of_platform != PLATFORM_OPAL) {
3031 prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
3032 prom_debug("->dt_header_start=0x%x\n", hdr);
3036 reloc_got2(-offset);
3041 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
3042 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
3043 __start(hdr, kbase, 0, 0, 0,
3044 prom_opal_base, prom_opal_entry);
3046 __start(hdr, kbase, 0, 0, 0, 0, 0);