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(0x004c0000), /* POWER8NVL */
659 W(0xffff0000), W(0x004d0000), /* POWER8 */
660 W(0xffffffff), W(0x0f000004), /* all 2.07-compliant */
661 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
662 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
663 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
664 NUM_VECTORS(6), /* 6 option vectors */
666 /* option vector 1: processor architectures supported */
667 VECTOR_LENGTH(2), /* length */
668 0, /* don't ignore, don't halt */
669 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
670 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
672 /* option vector 2: Open Firmware options supported */
673 VECTOR_LENGTH(33), /* length */
676 W(0xffffffff), /* real_base */
677 W(0xffffffff), /* real_size */
678 W(0xffffffff), /* virt_base */
679 W(0xffffffff), /* virt_size */
680 W(0xffffffff), /* load_base */
681 W(256), /* 256MB min RMA */
682 W(0xffffffff), /* full client load */
683 0, /* min RMA percentage of total RAM */
684 48, /* max log_2(hash table size) */
686 /* option vector 3: processor options supported */
687 VECTOR_LENGTH(2), /* length */
688 0, /* don't ignore, don't halt */
689 OV3_FP | OV3_VMX | OV3_DFP,
691 /* option vector 4: IBM PAPR implementation */
692 VECTOR_LENGTH(2), /* length */
694 OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
696 /* option vector 5: PAPR/OF options */
697 VECTOR_LENGTH(21), /* length */
698 0, /* don't ignore, don't halt */
699 OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
700 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
701 #ifdef CONFIG_PCI_MSI
702 /* PCIe/MSI support. Without MSI full PCIe is not supported */
708 #ifdef CONFIG_PPC_SMLPAR
709 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
713 OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
717 /* WARNING: The offset of the "number of cores" field below
718 * must match by the macro below. Update the definition if
719 * the structure layout changes.
721 #define IBM_ARCH_VEC_NRCORES_OFFSET 133
722 W(NR_CPUS), /* number of cores supported */
727 OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) |
728 OV5_FEAT(OV5_PFO_HW_842), /* Byte 17 */
732 OV5_FEAT(OV5_SUB_PROCESSORS), /* Byte 21 */
734 /* option vector 6: IBM PAPR hints */
735 VECTOR_LENGTH(3), /* length */
741 /* Old method - ELF header with PT_NOTE sections only works on BE */
742 #ifdef __BIG_ENDIAN__
743 static struct fake_elf {
750 char name[8]; /* "PowerPC" */
764 char name[24]; /* "IBM,RPA-Client-Config" */
778 .e_ident = { 0x7f, 'E', 'L', 'F',
779 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
780 .e_type = ET_EXEC, /* yeah right */
782 .e_version = EV_CURRENT,
783 .e_phoff = offsetof(struct fake_elf, phdr),
784 .e_phentsize = sizeof(Elf32_Phdr),
790 .p_offset = offsetof(struct fake_elf, chrpnote),
791 .p_filesz = sizeof(struct chrpnote)
794 .p_offset = offsetof(struct fake_elf, rpanote),
795 .p_filesz = sizeof(struct rpanote)
799 .namesz = sizeof("PowerPC"),
800 .descsz = sizeof(struct chrpdesc),
804 .real_mode = ~0U, /* ~0 means "don't care" */
813 .namesz = sizeof("IBM,RPA-Client-Config"),
814 .descsz = sizeof(struct rpadesc),
816 .name = "IBM,RPA-Client-Config",
819 .min_rmo_size = 64, /* in megabytes */
820 .min_rmo_percent = 0,
821 .max_pft_size = 48, /* 2^48 bytes max PFT size */
828 #endif /* __BIG_ENDIAN__ */
830 static int __init prom_count_smt_threads(void)
836 /* Pick up th first CPU node we can find */
837 for (node = 0; prom_next_node(&node); ) {
839 prom_getprop(node, "device_type", type, sizeof(type));
841 if (strcmp(type, "cpu"))
844 * There is an entry for each smt thread, each entry being
845 * 4 bytes long. All cpus should have the same number of
846 * smt threads, so return after finding the first.
848 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
849 if (plen == PROM_ERROR)
852 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
855 if (plen < 1 || plen > 64) {
856 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
857 (unsigned long)plen);
862 prom_debug("No threads found, assuming 1 per core\n");
869 static void __init prom_send_capabilities(void)
874 unsigned char *ptcores;
876 root = call_prom("open", 1, 1, ADDR("/"));
878 /* We need to tell the FW about the number of cores we support.
880 * To do that, we count the number of threads on the first core
881 * (we assume this is the same for all cores) and use it to
885 /* The core value may start at an odd address. If such a word
886 * access is made at a cache line boundary, this leads to an
887 * exception which may not be handled at this time.
888 * Forcing a per byte access to avoid exception.
890 ptcores = &ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET];
892 cores |= ptcores[0] << 24;
893 cores |= ptcores[1] << 16;
894 cores |= ptcores[2] << 8;
896 if (cores != NR_CPUS) {
897 prom_printf("WARNING ! "
898 "ibm_architecture_vec structure inconsistent: %lu!\n",
901 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
902 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
904 ptcores[0] = (cores >> 24) & 0xff;
905 ptcores[1] = (cores >> 16) & 0xff;
906 ptcores[2] = (cores >> 8) & 0xff;
907 ptcores[3] = cores & 0xff;
910 /* try calling the ibm,client-architecture-support method */
911 prom_printf("Calling ibm,client-architecture-support...");
912 if (call_prom_ret("call-method", 3, 2, &ret,
913 ADDR("ibm,client-architecture-support"),
915 ADDR(ibm_architecture_vec)) == 0) {
916 /* the call exists... */
918 prom_printf("\nWARNING: ibm,client-architecture"
919 "-support call FAILED!\n");
920 call_prom("close", 1, 0, root);
921 prom_printf(" done\n");
924 call_prom("close", 1, 0, root);
925 prom_printf(" not implemented\n");
928 #ifdef __BIG_ENDIAN__
932 /* no ibm,client-architecture-support call, try the old way */
933 elfloader = call_prom("open", 1, 1,
934 ADDR("/packages/elf-loader"));
935 if (elfloader == 0) {
936 prom_printf("couldn't open /packages/elf-loader\n");
939 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
940 elfloader, ADDR(&fake_elf));
941 call_prom("close", 1, 0, elfloader);
943 #endif /* __BIG_ENDIAN__ */
945 #endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
948 * Memory allocation strategy... our layout is normally:
950 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
951 * rare cases, initrd might end up being before the kernel though.
952 * We assume this won't override the final kernel at 0, we have no
953 * provision to handle that in this version, but it should hopefully
956 * alloc_top is set to the top of RMO, eventually shrink down if the
959 * alloc_bottom is set to the top of kernel/initrd
961 * from there, allocations are done this way : rtas is allocated
962 * topmost, and the device-tree is allocated from the bottom. We try
963 * to grow the device-tree allocation as we progress. If we can't,
964 * then we fail, we don't currently have a facility to restart
965 * elsewhere, but that shouldn't be necessary.
967 * Note that calls to reserve_mem have to be done explicitly, memory
968 * allocated with either alloc_up or alloc_down isn't automatically
974 * Allocates memory in the RMO upward from the kernel/initrd
976 * When align is 0, this is a special case, it means to allocate in place
977 * at the current location of alloc_bottom or fail (that is basically
978 * extending the previous allocation). Used for the device-tree flattening
980 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
982 unsigned long base = alloc_bottom;
983 unsigned long addr = 0;
986 base = _ALIGN_UP(base, align);
987 prom_debug("alloc_up(%x, %x)\n", size, align);
989 prom_panic("alloc_up() called with mem not initialized\n");
992 base = _ALIGN_UP(alloc_bottom, align);
996 for(; (base + size) <= alloc_top;
997 base = _ALIGN_UP(base + 0x100000, align)) {
998 prom_debug(" trying: 0x%x\n\r", base);
999 addr = (unsigned long)prom_claim(base, size, 0);
1000 if (addr != PROM_ERROR && addr != 0)
1008 alloc_bottom = addr + size;
1010 prom_debug(" -> %x\n", addr);
1011 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1012 prom_debug(" alloc_top : %x\n", alloc_top);
1013 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1014 prom_debug(" rmo_top : %x\n", rmo_top);
1015 prom_debug(" ram_top : %x\n", ram_top);
1021 * Allocates memory downward, either from top of RMO, or if highmem
1022 * is set, from the top of RAM. Note that this one doesn't handle
1023 * failures. It does claim memory if highmem is not set.
1025 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1028 unsigned long base, addr = 0;
1030 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1031 highmem ? "(high)" : "(low)");
1033 prom_panic("alloc_down() called with mem not initialized\n");
1036 /* Carve out storage for the TCE table. */
1037 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1038 if (addr <= alloc_bottom)
1040 /* Will we bump into the RMO ? If yes, check out that we
1041 * didn't overlap existing allocations there, if we did,
1042 * we are dead, we must be the first in town !
1044 if (addr < rmo_top) {
1045 /* Good, we are first */
1046 if (alloc_top == rmo_top)
1047 alloc_top = rmo_top = addr;
1051 alloc_top_high = addr;
1055 base = _ALIGN_DOWN(alloc_top - size, align);
1056 for (; base > alloc_bottom;
1057 base = _ALIGN_DOWN(base - 0x100000, align)) {
1058 prom_debug(" trying: 0x%x\n\r", base);
1059 addr = (unsigned long)prom_claim(base, size, 0);
1060 if (addr != PROM_ERROR && addr != 0)
1069 prom_debug(" -> %x\n", addr);
1070 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1071 prom_debug(" alloc_top : %x\n", alloc_top);
1072 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1073 prom_debug(" rmo_top : %x\n", rmo_top);
1074 prom_debug(" ram_top : %x\n", ram_top);
1080 * Parse a "reg" cell
1082 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1085 unsigned long r = 0;
1087 /* Ignore more than 2 cells */
1088 while (s > sizeof(unsigned long) / 4) {
1092 r = be32_to_cpu(*p++);
1096 r |= be32_to_cpu(*(p++));
1104 * Very dumb function for adding to the memory reserve list, but
1105 * we don't need anything smarter at this point
1107 * XXX Eventually check for collisions. They should NEVER happen.
1108 * If problems seem to show up, it would be a good start to track
1111 static void __init reserve_mem(u64 base, u64 size)
1113 u64 top = base + size;
1114 unsigned long cnt = mem_reserve_cnt;
1119 /* We need to always keep one empty entry so that we
1120 * have our terminator with "size" set to 0 since we are
1121 * dumb and just copy this entire array to the boot params
1123 base = _ALIGN_DOWN(base, PAGE_SIZE);
1124 top = _ALIGN_UP(top, PAGE_SIZE);
1127 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1128 prom_panic("Memory reserve map exhausted !\n");
1129 mem_reserve_map[cnt].base = cpu_to_be64(base);
1130 mem_reserve_map[cnt].size = cpu_to_be64(size);
1131 mem_reserve_cnt = cnt + 1;
1135 * Initialize memory allocation mechanism, parse "memory" nodes and
1136 * obtain that way the top of memory and RMO to setup out local allocator
1138 static void __init prom_init_mem(void)
1141 char *path, type[64];
1148 * We iterate the memory nodes to find
1149 * 1) top of RMO (first node)
1152 val = cpu_to_be32(2);
1153 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1154 rac = be32_to_cpu(val);
1155 val = cpu_to_be32(1);
1156 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1157 rsc = be32_to_cpu(val);
1158 prom_debug("root_addr_cells: %x\n", rac);
1159 prom_debug("root_size_cells: %x\n", rsc);
1161 prom_debug("scanning memory:\n");
1162 path = prom_scratch;
1164 for (node = 0; prom_next_node(&node); ) {
1166 prom_getprop(node, "device_type", type, sizeof(type));
1170 * CHRP Longtrail machines have no device_type
1171 * on the memory node, so check the name instead...
1173 prom_getprop(node, "name", type, sizeof(type));
1175 if (strcmp(type, "memory"))
1178 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1179 if (plen > sizeof(regbuf)) {
1180 prom_printf("memory node too large for buffer !\n");
1181 plen = sizeof(regbuf);
1184 endp = p + (plen / sizeof(cell_t));
1187 memset(path, 0, PROM_SCRATCH_SIZE);
1188 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1189 prom_debug(" node %s :\n", path);
1190 #endif /* DEBUG_PROM */
1192 while ((endp - p) >= (rac + rsc)) {
1193 unsigned long base, size;
1195 base = prom_next_cell(rac, &p);
1196 size = prom_next_cell(rsc, &p);
1200 prom_debug(" %x %x\n", base, size);
1201 if (base == 0 && (of_platform & PLATFORM_LPAR))
1203 if ((base + size) > ram_top)
1204 ram_top = base + size;
1208 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1211 * If prom_memory_limit is set we reduce the upper limits *except* for
1212 * alloc_top_high. This must be the real top of RAM so we can put
1216 alloc_top_high = ram_top;
1218 if (prom_memory_limit) {
1219 if (prom_memory_limit <= alloc_bottom) {
1220 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1222 prom_memory_limit = 0;
1223 } else if (prom_memory_limit >= ram_top) {
1224 prom_printf("Ignoring mem=%x >= ram_top.\n",
1226 prom_memory_limit = 0;
1228 ram_top = prom_memory_limit;
1229 rmo_top = min(rmo_top, prom_memory_limit);
1234 * Setup our top alloc point, that is top of RMO or top of
1235 * segment 0 when running non-LPAR.
1236 * Some RS64 machines have buggy firmware where claims up at
1237 * 1GB fail. Cap at 768MB as a workaround.
1238 * Since 768MB is plenty of room, and we need to cap to something
1239 * reasonable on 32-bit, cap at 768MB on all machines.
1243 rmo_top = min(0x30000000ul, rmo_top);
1244 alloc_top = rmo_top;
1245 alloc_top_high = ram_top;
1248 * Check if we have an initrd after the kernel but still inside
1249 * the RMO. If we do move our bottom point to after it.
1251 if (prom_initrd_start &&
1252 prom_initrd_start < rmo_top &&
1253 prom_initrd_end > alloc_bottom)
1254 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1256 prom_printf("memory layout at init:\n");
1257 prom_printf(" memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1258 prom_printf(" alloc_bottom : %x\n", alloc_bottom);
1259 prom_printf(" alloc_top : %x\n", alloc_top);
1260 prom_printf(" alloc_top_hi : %x\n", alloc_top_high);
1261 prom_printf(" rmo_top : %x\n", rmo_top);
1262 prom_printf(" ram_top : %x\n", ram_top);
1265 static void __init prom_close_stdin(void)
1270 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1271 stdin = be32_to_cpu(val);
1272 call_prom("close", 1, 0, stdin);
1276 #ifdef CONFIG_PPC_POWERNV
1278 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1279 static u64 __initdata prom_opal_base;
1280 static u64 __initdata prom_opal_entry;
1284 * Allocate room for and instantiate OPAL
1286 static void __init prom_instantiate_opal(void)
1291 u64 size = 0, align = 0x10000;
1295 prom_debug("prom_instantiate_opal: start...\n");
1297 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1298 prom_debug("opal_node: %x\n", opal_node);
1299 if (!PHANDLE_VALID(opal_node))
1303 prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
1304 size = be64_to_cpu(val64);
1308 prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
1309 align = be64_to_cpu(val64);
1311 base = alloc_down(size, align, 0);
1313 prom_printf("OPAL allocation failed !\n");
1317 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1318 if (!IHANDLE_VALID(opal_inst)) {
1319 prom_printf("opening opal package failed (%x)\n", opal_inst);
1323 prom_printf("instantiating opal at 0x%x...", base);
1325 if (call_prom_ret("call-method", 4, 3, rets,
1326 ADDR("load-opal-runtime"),
1328 base >> 32, base & 0xffffffff) != 0
1329 || (rets[0] == 0 && rets[1] == 0)) {
1330 prom_printf(" failed\n");
1333 entry = (((u64)rets[0]) << 32) | rets[1];
1335 prom_printf(" done\n");
1337 reserve_mem(base, size);
1339 prom_debug("opal base = 0x%x\n", base);
1340 prom_debug("opal align = 0x%x\n", align);
1341 prom_debug("opal entry = 0x%x\n", entry);
1342 prom_debug("opal size = 0x%x\n", (long)size);
1344 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1345 &base, sizeof(base));
1346 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1347 &entry, sizeof(entry));
1349 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1350 prom_opal_base = base;
1351 prom_opal_entry = entry;
1353 prom_debug("prom_instantiate_opal: end...\n");
1356 #endif /* CONFIG_PPC_POWERNV */
1359 * Allocate room for and instantiate RTAS
1361 static void __init prom_instantiate_rtas(void)
1365 u32 base, entry = 0;
1369 prom_debug("prom_instantiate_rtas: start...\n");
1371 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1372 prom_debug("rtas_node: %x\n", rtas_node);
1373 if (!PHANDLE_VALID(rtas_node))
1377 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1378 size = be32_to_cpu(val);
1382 base = alloc_down(size, PAGE_SIZE, 0);
1384 prom_panic("Could not allocate memory for RTAS\n");
1386 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1387 if (!IHANDLE_VALID(rtas_inst)) {
1388 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1392 prom_printf("instantiating rtas at 0x%x...", base);
1394 if (call_prom_ret("call-method", 3, 2, &entry,
1395 ADDR("instantiate-rtas"),
1396 rtas_inst, base) != 0
1398 prom_printf(" failed\n");
1401 prom_printf(" done\n");
1403 reserve_mem(base, size);
1405 val = cpu_to_be32(base);
1406 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1408 val = cpu_to_be32(entry);
1409 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1412 /* Check if it supports "query-cpu-stopped-state" */
1413 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1414 &val, sizeof(val)) != PROM_ERROR)
1415 rtas_has_query_cpu_stopped = true;
1417 prom_debug("rtas base = 0x%x\n", base);
1418 prom_debug("rtas entry = 0x%x\n", entry);
1419 prom_debug("rtas size = 0x%x\n", (long)size);
1421 prom_debug("prom_instantiate_rtas: end...\n");
1426 * Allocate room for and instantiate Stored Measurement Log (SML)
1428 static void __init prom_instantiate_sml(void)
1430 phandle ibmvtpm_node;
1431 ihandle ibmvtpm_inst;
1432 u32 entry = 0, size = 0, succ = 0;
1436 prom_debug("prom_instantiate_sml: start...\n");
1438 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
1439 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1440 if (!PHANDLE_VALID(ibmvtpm_node))
1443 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
1444 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1445 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1449 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
1450 &val, sizeof(val)) != PROM_ERROR) {
1451 if (call_prom_ret("call-method", 2, 2, &succ,
1452 ADDR("reformat-sml-to-efi-alignment"),
1453 ibmvtpm_inst) != 0 || succ == 0) {
1454 prom_printf("Reformat SML to EFI alignment failed\n");
1458 if (call_prom_ret("call-method", 2, 2, &size,
1459 ADDR("sml-get-allocated-size"),
1460 ibmvtpm_inst) != 0 || size == 0) {
1461 prom_printf("SML get allocated size failed\n");
1465 if (call_prom_ret("call-method", 2, 2, &size,
1466 ADDR("sml-get-handover-size"),
1467 ibmvtpm_inst) != 0 || size == 0) {
1468 prom_printf("SML get handover size failed\n");
1473 base = alloc_down(size, PAGE_SIZE, 0);
1475 prom_panic("Could not allocate memory for sml\n");
1477 prom_printf("instantiating sml at 0x%x...", base);
1479 memset((void *)base, 0, size);
1481 if (call_prom_ret("call-method", 4, 2, &entry,
1482 ADDR("sml-handover"),
1483 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1484 prom_printf("SML handover failed\n");
1487 prom_printf(" done\n");
1489 reserve_mem(base, size);
1491 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
1492 &base, sizeof(base));
1493 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
1494 &size, sizeof(size));
1496 prom_debug("sml base = 0x%x\n", base);
1497 prom_debug("sml size = 0x%x\n", (long)size);
1499 prom_debug("prom_instantiate_sml: end...\n");
1503 * Allocate room for and initialize TCE tables
1505 #ifdef __BIG_ENDIAN__
1506 static void __init prom_initialize_tce_table(void)
1510 char compatible[64], type[64], model[64];
1511 char *path = prom_scratch;
1513 u32 minalign, minsize;
1514 u64 tce_entry, *tce_entryp;
1515 u64 local_alloc_top, local_alloc_bottom;
1521 prom_debug("starting prom_initialize_tce_table\n");
1523 /* Cache current top of allocs so we reserve a single block */
1524 local_alloc_top = alloc_top_high;
1525 local_alloc_bottom = local_alloc_top;
1527 /* Search all nodes looking for PHBs. */
1528 for (node = 0; prom_next_node(&node); ) {
1532 prom_getprop(node, "compatible",
1533 compatible, sizeof(compatible));
1534 prom_getprop(node, "device_type", type, sizeof(type));
1535 prom_getprop(node, "model", model, sizeof(model));
1537 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1540 /* Keep the old logic intact to avoid regression. */
1541 if (compatible[0] != 0) {
1542 if ((strstr(compatible, "python") == NULL) &&
1543 (strstr(compatible, "Speedwagon") == NULL) &&
1544 (strstr(compatible, "Winnipeg") == NULL))
1546 } else if (model[0] != 0) {
1547 if ((strstr(model, "ython") == NULL) &&
1548 (strstr(model, "peedwagon") == NULL) &&
1549 (strstr(model, "innipeg") == NULL))
1553 if (prom_getprop(node, "tce-table-minalign", &minalign,
1554 sizeof(minalign)) == PROM_ERROR)
1556 if (prom_getprop(node, "tce-table-minsize", &minsize,
1557 sizeof(minsize)) == PROM_ERROR)
1558 minsize = 4UL << 20;
1561 * Even though we read what OF wants, we just set the table
1562 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1563 * By doing this, we avoid the pitfalls of trying to DMA to
1564 * MMIO space and the DMA alias hole.
1566 * On POWER4, firmware sets the TCE region by assuming
1567 * each TCE table is 8MB. Using this memory for anything
1568 * else will impact performance, so we always allocate 8MB.
1571 if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
1572 minsize = 8UL << 20;
1574 minsize = 4UL << 20;
1576 /* Align to the greater of the align or size */
1577 align = max(minalign, minsize);
1578 base = alloc_down(minsize, align, 1);
1580 prom_panic("ERROR, cannot find space for TCE table.\n");
1581 if (base < local_alloc_bottom)
1582 local_alloc_bottom = base;
1584 /* It seems OF doesn't null-terminate the path :-( */
1585 memset(path, 0, PROM_SCRATCH_SIZE);
1586 /* Call OF to setup the TCE hardware */
1587 if (call_prom("package-to-path", 3, 1, node,
1588 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1589 prom_printf("package-to-path failed\n");
1592 /* Save away the TCE table attributes for later use. */
1593 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1594 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1596 prom_debug("TCE table: %s\n", path);
1597 prom_debug("\tnode = 0x%x\n", node);
1598 prom_debug("\tbase = 0x%x\n", base);
1599 prom_debug("\tsize = 0x%x\n", minsize);
1601 /* Initialize the table to have a one-to-one mapping
1602 * over the allocated size.
1604 tce_entryp = (u64 *)base;
1605 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1606 tce_entry = (i << PAGE_SHIFT);
1608 *tce_entryp = tce_entry;
1611 prom_printf("opening PHB %s", path);
1612 phb_node = call_prom("open", 1, 1, path);
1614 prom_printf("... failed\n");
1616 prom_printf("... done\n");
1618 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1619 phb_node, -1, minsize,
1620 (u32) base, (u32) (base >> 32));
1621 call_prom("close", 1, 0, phb_node);
1624 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1626 /* These are only really needed if there is a memory limit in
1627 * effect, but we don't know so export them always. */
1628 prom_tce_alloc_start = local_alloc_bottom;
1629 prom_tce_alloc_end = local_alloc_top;
1631 /* Flag the first invalid entry */
1632 prom_debug("ending prom_initialize_tce_table\n");
1634 #endif /* __BIG_ENDIAN__ */
1635 #endif /* CONFIG_PPC64 */
1638 * With CHRP SMP we need to use the OF to start the other processors.
1639 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1640 * so we have to put the processors into a holding pattern controlled
1641 * by the kernel (not OF) before we destroy the OF.
1643 * This uses a chunk of low memory, puts some holding pattern
1644 * code there and sends the other processors off to there until
1645 * smp_boot_cpus tells them to do something. The holding pattern
1646 * checks that address until its cpu # is there, when it is that
1647 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1648 * of setting those values.
1650 * We also use physical address 0x4 here to tell when a cpu
1651 * is in its holding pattern code.
1656 * We want to reference the copy of __secondary_hold_* in the
1657 * 0 - 0x100 address range
1659 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1661 static void __init prom_hold_cpus(void)
1666 unsigned long *spinloop
1667 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1668 unsigned long *acknowledge
1669 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1670 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1673 * On pseries, if RTAS supports "query-cpu-stopped-state",
1674 * we skip this stage, the CPUs will be started by the
1675 * kernel using RTAS.
1677 if ((of_platform == PLATFORM_PSERIES ||
1678 of_platform == PLATFORM_PSERIES_LPAR) &&
1679 rtas_has_query_cpu_stopped) {
1680 prom_printf("prom_hold_cpus: skipped\n");
1684 prom_debug("prom_hold_cpus: start...\n");
1685 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1686 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1687 prom_debug(" 1) acknowledge = 0x%x\n",
1688 (unsigned long)acknowledge);
1689 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1690 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1692 /* Set the common spinloop variable, so all of the secondary cpus
1693 * will block when they are awakened from their OF spinloop.
1694 * This must occur for both SMP and non SMP kernels, since OF will
1695 * be trashed when we move the kernel.
1700 for (node = 0; prom_next_node(&node); ) {
1701 unsigned int cpu_no;
1705 prom_getprop(node, "device_type", type, sizeof(type));
1706 if (strcmp(type, "cpu") != 0)
1709 /* Skip non-configured cpus. */
1710 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1711 if (strcmp(type, "okay") != 0)
1714 reg = cpu_to_be32(-1); /* make sparse happy */
1715 prom_getprop(node, "reg", ®, sizeof(reg));
1716 cpu_no = be32_to_cpu(reg);
1718 prom_debug("cpu hw idx = %lu\n", cpu_no);
1720 /* Init the acknowledge var which will be reset by
1721 * the secondary cpu when it awakens from its OF
1724 *acknowledge = (unsigned long)-1;
1726 if (cpu_no != prom.cpu) {
1727 /* Primary Thread of non-boot cpu or any thread */
1728 prom_printf("starting cpu hw idx %lu... ", cpu_no);
1729 call_prom("start-cpu", 3, 0, node,
1730 secondary_hold, cpu_no);
1732 for (i = 0; (i < 100000000) &&
1733 (*acknowledge == ((unsigned long)-1)); i++ )
1736 if (*acknowledge == cpu_no)
1737 prom_printf("done\n");
1739 prom_printf("failed: %x\n", *acknowledge);
1743 prom_printf("boot cpu hw idx %lu\n", cpu_no);
1744 #endif /* CONFIG_SMP */
1747 prom_debug("prom_hold_cpus: end...\n");
1751 static void __init prom_init_client_services(unsigned long pp)
1753 /* Get a handle to the prom entry point before anything else */
1756 /* get a handle for the stdout device */
1757 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1758 if (!PHANDLE_VALID(prom.chosen))
1759 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1761 /* get device tree root */
1762 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
1763 if (!PHANDLE_VALID(prom.root))
1764 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1771 * For really old powermacs, we need to map things we claim.
1772 * For that, we need the ihandle of the mmu.
1773 * Also, on the longtrail, we need to work around other bugs.
1775 static void __init prom_find_mmu(void)
1780 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1781 if (!PHANDLE_VALID(oprom))
1783 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1785 version[sizeof(version) - 1] = 0;
1786 /* XXX might need to add other versions here */
1787 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1788 of_workarounds = OF_WA_CLAIM;
1789 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1790 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1791 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1794 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
1795 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
1796 sizeof(prom.mmumap));
1797 prom.mmumap = be32_to_cpu(prom.mmumap);
1798 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
1799 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1802 #define prom_find_mmu()
1805 static void __init prom_init_stdout(void)
1807 char *path = of_stdout_device;
1809 phandle stdout_node;
1812 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
1813 prom_panic("cannot find stdout");
1815 prom.stdout = be32_to_cpu(val);
1817 /* Get the full OF pathname of the stdout device */
1818 memset(path, 0, 256);
1819 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
1820 prom_printf("OF stdout device is: %s\n", of_stdout_device);
1821 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
1822 path, strlen(path) + 1);
1824 /* instance-to-package fails on PA-Semi */
1825 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
1826 if (stdout_node != PROM_ERROR) {
1827 val = cpu_to_be32(stdout_node);
1828 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
1831 /* If it's a display, note it */
1832 memset(type, 0, sizeof(type));
1833 prom_getprop(stdout_node, "device_type", type, sizeof(type));
1834 if (strcmp(type, "display") == 0)
1835 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
1839 static int __init prom_find_machine_type(void)
1848 /* Look for a PowerMac or a Cell */
1849 len = prom_getprop(prom.root, "compatible",
1850 compat, sizeof(compat)-1);
1854 char *p = &compat[i];
1858 if (strstr(p, "Power Macintosh") ||
1859 strstr(p, "MacRISC"))
1860 return PLATFORM_POWERMAC;
1862 /* We must make sure we don't detect the IBM Cell
1863 * blades as pSeries due to some firmware issues,
1866 if (strstr(p, "IBM,CBEA") ||
1867 strstr(p, "IBM,CPBW-1.0"))
1868 return PLATFORM_GENERIC;
1869 #endif /* CONFIG_PPC64 */
1874 /* Try to detect OPAL */
1875 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
1876 return PLATFORM_OPAL;
1878 /* Try to figure out if it's an IBM pSeries or any other
1879 * PAPR compliant platform. We assume it is if :
1880 * - /device_type is "chrp" (please, do NOT use that for future
1884 len = prom_getprop(prom.root, "device_type",
1885 compat, sizeof(compat)-1);
1887 return PLATFORM_GENERIC;
1888 if (strcmp(compat, "chrp"))
1889 return PLATFORM_GENERIC;
1891 /* Default to pSeries. We need to know if we are running LPAR */
1892 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1893 if (!PHANDLE_VALID(rtas))
1894 return PLATFORM_GENERIC;
1895 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1896 if (x != PROM_ERROR) {
1897 prom_debug("Hypertas detected, assuming LPAR !\n");
1898 return PLATFORM_PSERIES_LPAR;
1900 return PLATFORM_PSERIES;
1902 return PLATFORM_GENERIC;
1906 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1908 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1912 * If we have a display that we don't know how to drive,
1913 * we will want to try to execute OF's open method for it
1914 * later. However, OF will probably fall over if we do that
1915 * we've taken over the MMU.
1916 * So we check whether we will need to open the display,
1917 * and if so, open it now.
1919 static void __init prom_check_displays(void)
1921 char type[16], *path;
1926 static unsigned char default_colors[] = {
1944 const unsigned char *clut;
1946 prom_debug("Looking for displays\n");
1947 for (node = 0; prom_next_node(&node); ) {
1948 memset(type, 0, sizeof(type));
1949 prom_getprop(node, "device_type", type, sizeof(type));
1950 if (strcmp(type, "display") != 0)
1953 /* It seems OF doesn't null-terminate the path :-( */
1954 path = prom_scratch;
1955 memset(path, 0, PROM_SCRATCH_SIZE);
1958 * leave some room at the end of the path for appending extra
1961 if (call_prom("package-to-path", 3, 1, node, path,
1962 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1964 prom_printf("found display : %s, opening... ", path);
1966 ih = call_prom("open", 1, 1, path);
1968 prom_printf("failed\n");
1973 prom_printf("done\n");
1974 prom_setprop(node, path, "linux,opened", NULL, 0);
1976 /* Setup a usable color table when the appropriate
1977 * method is available. Should update this to set-colors */
1978 clut = default_colors;
1979 for (i = 0; i < 16; i++, clut += 3)
1980 if (prom_set_color(ih, i, clut[0], clut[1],
1984 #ifdef CONFIG_LOGO_LINUX_CLUT224
1985 clut = PTRRELOC(logo_linux_clut224.clut);
1986 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
1987 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1990 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1992 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
1993 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
1995 u32 width, height, pitch, addr;
1997 prom_printf("Setting btext !\n");
1998 prom_getprop(node, "width", &width, 4);
1999 prom_getprop(node, "height", &height, 4);
2000 prom_getprop(node, "linebytes", &pitch, 4);
2001 prom_getprop(node, "address", &addr, 4);
2002 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2003 width, height, pitch, addr);
2004 btext_setup_display(width, height, 8, pitch, addr);
2006 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2011 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2012 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2013 unsigned long needed, unsigned long align)
2017 *mem_start = _ALIGN(*mem_start, align);
2018 while ((*mem_start + needed) > *mem_end) {
2019 unsigned long room, chunk;
2021 prom_debug("Chunk exhausted, claiming more at %x...\n",
2023 room = alloc_top - alloc_bottom;
2024 if (room > DEVTREE_CHUNK_SIZE)
2025 room = DEVTREE_CHUNK_SIZE;
2026 if (room < PAGE_SIZE)
2027 prom_panic("No memory for flatten_device_tree "
2029 chunk = alloc_up(room, 0);
2031 prom_panic("No memory for flatten_device_tree "
2032 "(claim failed)\n");
2033 *mem_end = chunk + room;
2036 ret = (void *)*mem_start;
2037 *mem_start += needed;
2042 #define dt_push_token(token, mem_start, mem_end) do { \
2043 void *room = make_room(mem_start, mem_end, 4, 4); \
2044 *(__be32 *)room = cpu_to_be32(token); \
2047 static unsigned long __init dt_find_string(char *str)
2051 s = os = (char *)dt_string_start;
2053 while (s < (char *)dt_string_end) {
2054 if (strcmp(s, str) == 0)
2062 * The Open Firmware 1275 specification states properties must be 31 bytes or
2063 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2065 #define MAX_PROPERTY_NAME 64
2067 static void __init scan_dt_build_strings(phandle node,
2068 unsigned long *mem_start,
2069 unsigned long *mem_end)
2071 char *prev_name, *namep, *sstart;
2075 sstart = (char *)dt_string_start;
2077 /* get and store all property names */
2080 /* 64 is max len of name including nul. */
2081 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2082 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2083 /* No more nodes: unwind alloc */
2084 *mem_start = (unsigned long)namep;
2089 if (strcmp(namep, "name") == 0) {
2090 *mem_start = (unsigned long)namep;
2094 /* get/create string entry */
2095 soff = dt_find_string(namep);
2097 *mem_start = (unsigned long)namep;
2098 namep = sstart + soff;
2100 /* Trim off some if we can */
2101 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2102 dt_string_end = *mem_start;
2107 /* do all our children */
2108 child = call_prom("child", 1, 1, node);
2109 while (child != 0) {
2110 scan_dt_build_strings(child, mem_start, mem_end);
2111 child = call_prom("peer", 1, 1, child);
2115 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2116 unsigned long *mem_end)
2119 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2121 unsigned char *valp;
2122 static char pname[MAX_PROPERTY_NAME];
2123 int l, room, has_phandle = 0;
2125 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2127 /* get the node's full name */
2128 namep = (char *)*mem_start;
2129 room = *mem_end - *mem_start;
2132 l = call_prom("package-to-path", 3, 1, node, namep, room);
2134 /* Didn't fit? Get more room. */
2136 if (l >= *mem_end - *mem_start)
2137 namep = make_room(mem_start, mem_end, l+1, 1);
2138 call_prom("package-to-path", 3, 1, node, namep, l);
2142 /* Fixup an Apple bug where they have bogus \0 chars in the
2143 * middle of the path in some properties, and extract
2144 * the unit name (everything after the last '/').
2146 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2153 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2156 /* get it again for debugging */
2157 path = prom_scratch;
2158 memset(path, 0, PROM_SCRATCH_SIZE);
2159 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2161 /* get and store all properties */
2163 sstart = (char *)dt_string_start;
2165 if (call_prom("nextprop", 3, 1, node, prev_name,
2170 if (strcmp(pname, "name") == 0) {
2175 /* find string offset */
2176 soff = dt_find_string(pname);
2178 prom_printf("WARNING: Can't find string index for"
2179 " <%s>, node %s\n", pname, path);
2182 prev_name = sstart + soff;
2185 l = call_prom("getproplen", 2, 1, node, pname);
2188 if (l == PROM_ERROR)
2191 /* push property head */
2192 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2193 dt_push_token(l, mem_start, mem_end);
2194 dt_push_token(soff, mem_start, mem_end);
2196 /* push property content */
2197 valp = make_room(mem_start, mem_end, l, 4);
2198 call_prom("getprop", 4, 1, node, pname, valp, l);
2199 *mem_start = _ALIGN(*mem_start, 4);
2201 if (!strcmp(pname, "phandle"))
2205 /* Add a "linux,phandle" property if no "phandle" property already
2206 * existed (can happen with OPAL)
2209 soff = dt_find_string("linux,phandle");
2211 prom_printf("WARNING: Can't find string index for"
2212 " <linux-phandle> node %s\n", path);
2214 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2215 dt_push_token(4, mem_start, mem_end);
2216 dt_push_token(soff, mem_start, mem_end);
2217 valp = make_room(mem_start, mem_end, 4, 4);
2218 *(__be32 *)valp = cpu_to_be32(node);
2222 /* do all our children */
2223 child = call_prom("child", 1, 1, node);
2224 while (child != 0) {
2225 scan_dt_build_struct(child, mem_start, mem_end);
2226 child = call_prom("peer", 1, 1, child);
2229 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2232 static void __init flatten_device_tree(void)
2235 unsigned long mem_start, mem_end, room;
2236 struct boot_param_header *hdr;
2241 * Check how much room we have between alloc top & bottom (+/- a
2242 * few pages), crop to 1MB, as this is our "chunk" size
2244 room = alloc_top - alloc_bottom - 0x4000;
2245 if (room > DEVTREE_CHUNK_SIZE)
2246 room = DEVTREE_CHUNK_SIZE;
2247 prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2249 /* Now try to claim that */
2250 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2252 prom_panic("Can't allocate initial device-tree chunk\n");
2253 mem_end = mem_start + room;
2255 /* Get root of tree */
2256 root = call_prom("peer", 1, 1, (phandle)0);
2257 if (root == (phandle)0)
2258 prom_panic ("couldn't get device tree root\n");
2260 /* Build header and make room for mem rsv map */
2261 mem_start = _ALIGN(mem_start, 4);
2262 hdr = make_room(&mem_start, &mem_end,
2263 sizeof(struct boot_param_header), 4);
2264 dt_header_start = (unsigned long)hdr;
2265 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2267 /* Start of strings */
2268 mem_start = PAGE_ALIGN(mem_start);
2269 dt_string_start = mem_start;
2270 mem_start += 4; /* hole */
2272 /* Add "linux,phandle" in there, we'll need it */
2273 namep = make_room(&mem_start, &mem_end, 16, 1);
2274 strcpy(namep, "linux,phandle");
2275 mem_start = (unsigned long)namep + strlen(namep) + 1;
2277 /* Build string array */
2278 prom_printf("Building dt strings...\n");
2279 scan_dt_build_strings(root, &mem_start, &mem_end);
2280 dt_string_end = mem_start;
2282 /* Build structure */
2283 mem_start = PAGE_ALIGN(mem_start);
2284 dt_struct_start = mem_start;
2285 prom_printf("Building dt structure...\n");
2286 scan_dt_build_struct(root, &mem_start, &mem_end);
2287 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2288 dt_struct_end = PAGE_ALIGN(mem_start);
2291 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2292 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2293 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2294 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2295 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2296 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2297 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2298 hdr->version = cpu_to_be32(OF_DT_VERSION);
2299 /* Version 16 is not backward compatible */
2300 hdr->last_comp_version = cpu_to_be32(0x10);
2302 /* Copy the reserve map in */
2303 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2308 prom_printf("reserved memory map:\n");
2309 for (i = 0; i < mem_reserve_cnt; i++)
2310 prom_printf(" %x - %x\n",
2311 be64_to_cpu(mem_reserve_map[i].base),
2312 be64_to_cpu(mem_reserve_map[i].size));
2315 /* Bump mem_reserve_cnt to cause further reservations to fail
2316 * since it's too late.
2318 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2320 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2321 dt_string_start, dt_string_end);
2322 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2323 dt_struct_start, dt_struct_end);
2326 #ifdef CONFIG_PPC_MAPLE
2327 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2328 * The values are bad, and it doesn't even have the right number of cells. */
2329 static void __init fixup_device_tree_maple(void)
2332 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2336 name = "/ht@0/isa@4";
2337 isa = call_prom("finddevice", 1, 1, ADDR(name));
2338 if (!PHANDLE_VALID(isa)) {
2339 name = "/ht@0/isa@6";
2340 isa = call_prom("finddevice", 1, 1, ADDR(name));
2341 rloc = 0x01003000; /* IO space; PCI device = 6 */
2343 if (!PHANDLE_VALID(isa))
2346 if (prom_getproplen(isa, "ranges") != 12)
2348 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2352 if (isa_ranges[0] != 0x1 ||
2353 isa_ranges[1] != 0xf4000000 ||
2354 isa_ranges[2] != 0x00010000)
2357 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2359 isa_ranges[0] = 0x1;
2360 isa_ranges[1] = 0x0;
2361 isa_ranges[2] = rloc;
2362 isa_ranges[3] = 0x0;
2363 isa_ranges[4] = 0x0;
2364 isa_ranges[5] = 0x00010000;
2365 prom_setprop(isa, name, "ranges",
2366 isa_ranges, sizeof(isa_ranges));
2369 #define CPC925_MC_START 0xf8000000
2370 #define CPC925_MC_LENGTH 0x1000000
2371 /* The values for memory-controller don't have right number of cells */
2372 static void __init fixup_device_tree_maple_memory_controller(void)
2376 char *name = "/hostbridge@f8000000";
2379 mc = call_prom("finddevice", 1, 1, ADDR(name));
2380 if (!PHANDLE_VALID(mc))
2383 if (prom_getproplen(mc, "reg") != 8)
2386 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2387 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2388 if ((ac != 2) || (sc != 2))
2391 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2394 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2397 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2400 mc_reg[1] = CPC925_MC_START;
2402 mc_reg[3] = CPC925_MC_LENGTH;
2403 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2406 #define fixup_device_tree_maple()
2407 #define fixup_device_tree_maple_memory_controller()
2410 #ifdef CONFIG_PPC_CHRP
2412 * Pegasos and BriQ lacks the "ranges" property in the isa node
2413 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2414 * Pegasos has the IDE configured in legacy mode, but advertised as native
2416 static void __init fixup_device_tree_chrp(void)
2420 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2424 name = "/pci@80000000/isa@c";
2425 ph = call_prom("finddevice", 1, 1, ADDR(name));
2426 if (!PHANDLE_VALID(ph)) {
2427 name = "/pci@ff500000/isa@6";
2428 ph = call_prom("finddevice", 1, 1, ADDR(name));
2429 rloc = 0x01003000; /* IO space; PCI device = 6 */
2431 if (PHANDLE_VALID(ph)) {
2432 rc = prom_getproplen(ph, "ranges");
2433 if (rc == 0 || rc == PROM_ERROR) {
2434 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2441 prop[5] = 0x00010000;
2442 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2446 name = "/pci@80000000/ide@C,1";
2447 ph = call_prom("finddevice", 1, 1, ADDR(name));
2448 if (PHANDLE_VALID(ph)) {
2449 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2452 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2453 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2454 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2455 if (rc == sizeof(u32)) {
2457 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2462 #define fixup_device_tree_chrp()
2465 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2466 static void __init fixup_device_tree_pmac(void)
2468 phandle u3, i2c, mpic;
2473 /* Some G5s have a missing interrupt definition, fix it up here */
2474 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2475 if (!PHANDLE_VALID(u3))
2477 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2478 if (!PHANDLE_VALID(i2c))
2480 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2481 if (!PHANDLE_VALID(mpic))
2484 /* check if proper rev of u3 */
2485 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2488 if (u3_rev < 0x35 || u3_rev > 0x39)
2490 /* does it need fixup ? */
2491 if (prom_getproplen(i2c, "interrupts") > 0)
2494 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2496 /* interrupt on this revision of u3 is number 0 and level */
2499 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2500 &interrupts, sizeof(interrupts));
2502 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2503 &parent, sizeof(parent));
2506 #define fixup_device_tree_pmac()
2509 #ifdef CONFIG_PPC_EFIKA
2511 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2512 * to talk to the phy. If the phy-handle property is missing, then this
2513 * function is called to add the appropriate nodes and link it to the
2516 static void __init fixup_device_tree_efika_add_phy(void)
2522 /* Check if /builtin/ethernet exists - bail if it doesn't */
2523 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2524 if (!PHANDLE_VALID(node))
2527 /* Check if the phy-handle property exists - bail if it does */
2528 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2533 * At this point the ethernet device doesn't have a phy described.
2534 * Now we need to add the missing phy node and linkage
2537 /* Check for an MDIO bus node - if missing then create one */
2538 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2539 if (!PHANDLE_VALID(node)) {
2540 prom_printf("Adding Ethernet MDIO node\n");
2541 call_prom("interpret", 1, 1,
2542 " s\" /builtin\" find-device"
2544 " 1 encode-int s\" #address-cells\" property"
2545 " 0 encode-int s\" #size-cells\" property"
2546 " s\" mdio\" device-name"
2547 " s\" fsl,mpc5200b-mdio\" encode-string"
2548 " s\" compatible\" property"
2549 " 0xf0003000 0x400 reg"
2551 " 0x5 encode-int encode+"
2552 " 0x3 encode-int encode+"
2553 " s\" interrupts\" property"
2557 /* Check for a PHY device node - if missing then create one and
2558 * give it's phandle to the ethernet node */
2559 node = call_prom("finddevice", 1, 1,
2560 ADDR("/builtin/mdio/ethernet-phy"));
2561 if (!PHANDLE_VALID(node)) {
2562 prom_printf("Adding Ethernet PHY node\n");
2563 call_prom("interpret", 1, 1,
2564 " s\" /builtin/mdio\" find-device"
2566 " s\" ethernet-phy\" device-name"
2567 " 0x10 encode-int s\" reg\" property"
2571 " s\" /builtin/ethernet\" find-device"
2573 " s\" phy-handle\" property"
2578 static void __init fixup_device_tree_efika(void)
2580 int sound_irq[3] = { 2, 2, 0 };
2581 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2582 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2583 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2584 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2589 /* Check if we're really running on a EFIKA */
2590 node = call_prom("finddevice", 1, 1, ADDR("/"));
2591 if (!PHANDLE_VALID(node))
2594 rv = prom_getprop(node, "model", prop, sizeof(prop));
2595 if (rv == PROM_ERROR)
2597 if (strcmp(prop, "EFIKA5K2"))
2600 prom_printf("Applying EFIKA device tree fixups\n");
2602 /* Claiming to be 'chrp' is death */
2603 node = call_prom("finddevice", 1, 1, ADDR("/"));
2604 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2605 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2606 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2608 /* CODEGEN,description is exposed in /proc/cpuinfo so
2610 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2611 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2612 prom_setprop(node, "/", "CODEGEN,description",
2613 "Efika 5200B PowerPC System",
2614 sizeof("Efika 5200B PowerPC System"));
2616 /* Fixup bestcomm interrupts property */
2617 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2618 if (PHANDLE_VALID(node)) {
2619 len = prom_getproplen(node, "interrupts");
2621 prom_printf("Fixing bestcomm interrupts property\n");
2622 prom_setprop(node, "/builtin/bestcom", "interrupts",
2623 bcomm_irq, sizeof(bcomm_irq));
2627 /* Fixup sound interrupts property */
2628 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2629 if (PHANDLE_VALID(node)) {
2630 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2631 if (rv == PROM_ERROR) {
2632 prom_printf("Adding sound interrupts property\n");
2633 prom_setprop(node, "/builtin/sound", "interrupts",
2634 sound_irq, sizeof(sound_irq));
2638 /* Make sure ethernet phy-handle property exists */
2639 fixup_device_tree_efika_add_phy();
2642 #define fixup_device_tree_efika()
2645 static void __init fixup_device_tree(void)
2647 fixup_device_tree_maple();
2648 fixup_device_tree_maple_memory_controller();
2649 fixup_device_tree_chrp();
2650 fixup_device_tree_pmac();
2651 fixup_device_tree_efika();
2654 static void __init prom_find_boot_cpu(void)
2661 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
2663 prom_cpu = be32_to_cpu(rval);
2665 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2667 if (!PHANDLE_VALID(cpu_pkg))
2670 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
2671 prom.cpu = be32_to_cpu(rval);
2673 prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
2676 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2678 #ifdef CONFIG_BLK_DEV_INITRD
2679 if (r3 && r4 && r4 != 0xdeadbeef) {
2682 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
2683 prom_initrd_end = prom_initrd_start + r4;
2685 val = cpu_to_be64(prom_initrd_start);
2686 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
2688 val = cpu_to_be64(prom_initrd_end);
2689 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
2692 reserve_mem(prom_initrd_start,
2693 prom_initrd_end - prom_initrd_start);
2695 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
2696 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
2698 #endif /* CONFIG_BLK_DEV_INITRD */
2702 #ifdef CONFIG_RELOCATABLE
2703 static void reloc_toc(void)
2707 static void unreloc_toc(void)
2711 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
2714 unsigned long *toc_entry;
2716 /* Get the start of the TOC by using r2 directly. */
2717 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
2719 for (i = 0; i < nr_entries; i++) {
2720 *toc_entry = *toc_entry + offset;
2725 static void reloc_toc(void)
2727 unsigned long offset = reloc_offset();
2728 unsigned long nr_entries =
2729 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2731 __reloc_toc(offset, nr_entries);
2736 static void unreloc_toc(void)
2738 unsigned long offset = reloc_offset();
2739 unsigned long nr_entries =
2740 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2744 __reloc_toc(-offset, nr_entries);
2750 * We enter here early on, when the Open Firmware prom is still
2751 * handling exceptions and the MMU hash table for us.
2754 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2756 unsigned long r6, unsigned long r7,
2757 unsigned long kbase)
2762 unsigned long offset = reloc_offset();
2769 * First zero the BSS
2771 memset(&__bss_start, 0, __bss_stop - __bss_start);
2774 * Init interface to Open Firmware, get some node references,
2777 prom_init_client_services(pp);
2780 * See if this OF is old enough that we need to do explicit maps
2781 * and other workarounds
2786 * Init prom stdout device
2790 prom_printf("Preparing to boot %s", linux_banner);
2793 * Get default machine type. At this point, we do not differentiate
2794 * between pSeries SMP and pSeries LPAR
2796 of_platform = prom_find_machine_type();
2797 prom_printf("Detected machine type: %x\n", of_platform);
2799 #ifndef CONFIG_NONSTATIC_KERNEL
2800 /* Bail if this is a kdump kernel. */
2801 if (PHYSICAL_START > 0)
2802 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2806 * Check for an initrd
2808 prom_check_initrd(r3, r4);
2810 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2812 * On pSeries, inform the firmware about our capabilities
2814 if (of_platform == PLATFORM_PSERIES ||
2815 of_platform == PLATFORM_PSERIES_LPAR)
2816 prom_send_capabilities();
2820 * Copy the CPU hold code
2822 if (of_platform != PLATFORM_POWERMAC)
2823 copy_and_flush(0, kbase, 0x100, 0);
2826 * Do early parsing of command line
2828 early_cmdline_parse();
2831 * Initialize memory management within prom_init
2836 * Determine which cpu is actually running right _now_
2838 prom_find_boot_cpu();
2841 * Initialize display devices
2843 prom_check_displays();
2845 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
2847 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2848 * that uses the allocator, we need to make sure we get the top of memory
2849 * available for us here...
2851 if (of_platform == PLATFORM_PSERIES)
2852 prom_initialize_tce_table();
2856 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2857 * have a usable RTAS implementation.
2859 if (of_platform != PLATFORM_POWERMAC &&
2860 of_platform != PLATFORM_OPAL)
2861 prom_instantiate_rtas();
2863 #ifdef CONFIG_PPC_POWERNV
2864 if (of_platform == PLATFORM_OPAL)
2865 prom_instantiate_opal();
2866 #endif /* CONFIG_PPC_POWERNV */
2869 /* instantiate sml */
2870 prom_instantiate_sml();
2874 * On non-powermacs, put all CPUs in spin-loops.
2876 * PowerMacs use a different mechanism to spin CPUs
2878 * (This must be done after instanciating RTAS)
2880 if (of_platform != PLATFORM_POWERMAC &&
2881 of_platform != PLATFORM_OPAL)
2885 * Fill in some infos for use by the kernel later on
2887 if (prom_memory_limit) {
2888 __be64 val = cpu_to_be64(prom_memory_limit);
2889 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
2894 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
2897 if (prom_iommu_force_on)
2898 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
2901 if (prom_tce_alloc_start) {
2902 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
2903 &prom_tce_alloc_start,
2904 sizeof(prom_tce_alloc_start));
2905 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
2906 &prom_tce_alloc_end,
2907 sizeof(prom_tce_alloc_end));
2912 * Fixup any known bugs in the device-tree
2914 fixup_device_tree();
2917 * Now finally create the flattened device-tree
2919 prom_printf("copying OF device tree...\n");
2920 flatten_device_tree();
2923 * in case stdin is USB and still active on IBM machines...
2924 * Unfortunately quiesce crashes on some powermacs if we have
2925 * closed stdin already (in particular the powerbook 101). It
2926 * appears that the OPAL version of OFW doesn't like it either.
2928 if (of_platform != PLATFORM_POWERMAC &&
2929 of_platform != PLATFORM_OPAL)
2933 * Call OF "quiesce" method to shut down pending DMA's from
2936 prom_printf("Quiescing Open Firmware ...\n");
2937 call_prom("quiesce", 0, 0);
2940 * And finally, call the kernel passing it the flattened device
2941 * tree and NULL as r5, thus triggering the new entry point which
2942 * is common to us and kexec
2944 hdr = dt_header_start;
2946 /* Don't print anything after quiesce under OPAL, it crashes OFW */
2947 if (of_platform != PLATFORM_OPAL) {
2948 prom_printf("Booting Linux via __start() ...\n");
2949 prom_debug("->dt_header_start=0x%x\n", hdr);
2953 reloc_got2(-offset);
2958 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
2959 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
2960 __start(hdr, kbase, 0, 0, 0,
2961 prom_opal_base, prom_opal_entry);
2963 __start(hdr, kbase, 0, 0, 0, 0, 0);