arch/arm26/kernel/setup.c

   1 /*
   2  *  linux/arch/arm26/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995-2001 Russell King
   5  *  Copyright (C) 2003 Ian Molton
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/stddef.h>
  13 #include <linux/ioport.h>
  14 #include <linux/delay.h>
  15 #include <linux/utsname.h>
  16 #include <linux/blkdev.h>
  17 #include <linux/console.h>
  18 #include <linux/bootmem.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/screen_info.h>
  21 #include <linux/init.h>
  22 #include <linux/root_dev.h>
  23
  24 #include <asm/elf.h>
  25 #include <asm/hardware.h>
  26 #include <asm/io.h>
  27 #include <asm/procinfo.h>
  28 #include <asm/setup.h>
  29 #include <asm/mach-types.h>
  30 #include <asm/tlbflush.h>
  31
  32 #include <asm/irqchip.h>
  33
  34 #ifndef MEM_SIZE
  35 #define MEM_SIZE        (16*1024*1024)
  36 #endif
  37
  38 #ifdef CONFIG_PREEMPT
  39 DEFINE_SPINLOCK(kernel_flag);
  40 #endif
  41
  42 #if defined(CONFIG_FPE_NWFPE)
  43 char fpe_type[8];
  44
  45 static int __init fpe_setup(char *line)
  46 {
  47         memcpy(fpe_type, line, 8);
  48         return 1;
  49 }
  50
  51 __setup("fpe=", fpe_setup);
  52 #endif
  53
  54 extern void paging_init(struct meminfo *);
  55 extern void convert_to_tag_list(struct tag *tags);
  56 extern void squash_mem_tags(struct tag *tag);
  57 extern void bootmem_init(struct meminfo *);
  58 extern int root_mountflags;
  59 extern int _stext, _text, _etext, _edata, _end;
  60 #ifdef CONFIG_XIP_KERNEL
  61 extern int _endtext, _sdata;
  62 #endif
  63
  64
  65 unsigned int processor_id;
  66 unsigned int __machine_arch_type;
  67 unsigned int system_rev;
  68 unsigned int system_serial_low;
  69 unsigned int system_serial_high;
  70 unsigned int elf_hwcap;
  71 unsigned int memc_ctrl_reg;
  72 unsigned int number_mfm_drives;
  73
  74 struct processor processor;
  75
  76 char elf_platform[ELF_PLATFORM_SIZE];
  77
  78 unsigned long phys_initrd_start __initdata = 0;
  79 unsigned long phys_initrd_size __initdata = 0;
  80 static struct meminfo meminfo __initdata = { 0, };
  81 static struct proc_info_item proc_info;
  82 static const char *machine_name;
  83 static char __initdata command_line[COMMAND_LINE_SIZE];
  84
  85 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  86
  87 /*
  88  * Standard memory resources
  89  */
  90 static struct resource mem_res[] = {
  91         { "Video RAM",   0,     0,     IORESOURCE_MEM                   },
  92         { "Kernel code", 0,     0,     IORESOURCE_MEM                   },
  93         { "Kernel data", 0,     0,     IORESOURCE_MEM                   }
  94 };
  95
  96 #define video_ram   mem_res[0]
  97 #define kernel_code mem_res[1]
  98 #define kernel_data mem_res[2]
  99
 100 static struct resource io_res[] = {
 101         { "reserved",    0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
 102         { "reserved",    0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
 103         { "reserved",    0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
 104 };
 105
 106 #define lp0 io_res[0]
 107 #define lp1 io_res[1]
 108 #define lp2 io_res[2]
 109
 110 #define dump_cpu_info() do { } while (0)
 111
 112 static void __init setup_processor(void)
 113 {
 114         extern struct proc_info_list __proc_info_begin, __proc_info_end;
 115         struct proc_info_list *list;
 116
 117         /*
 118          * locate processor in the list of supported processor
 119          * types.  The linker builds this table for us from the
 120          * entries in arch/arm26/mm/proc-*.S
 121          */
 122         for (list = &__proc_info_begin; list < &__proc_info_end ; list++)
 123                 if ((processor_id & list->cpu_mask) == list->cpu_val)
 124                         break;
 125
 126         /*
 127          * If processor type is unrecognised, then we
 128          * can do nothing...
 129          */
 130         if (list >= &__proc_info_end) {
 131                 printk("CPU configuration botched (ID %08x), unable "
 132                        "to continue.\n", processor_id);
 133                 while (1);
 134         }
 135
 136         proc_info = *list->info;
 137         processor = *list->proc;
 138
 139
 140         printk("CPU: %s %s revision %d\n",
 141                proc_info.manufacturer, proc_info.cpu_name,
 142                (int)processor_id & 15);
 143
 144         dump_cpu_info();
 145
 146         sprintf(init_utsname()->machine, "%s", list->arch_name);
 147         sprintf(elf_platform, "%s", list->elf_name);
 148         elf_hwcap = list->elf_hwcap;
 149
 150         cpu_proc_init();
 151 }
 152
 153 /*
 154  * Initial parsing of the command line.  We need to pick out the
 155  * memory size.  We look for mem=size@start, where start and size
 156  * are "size[KkMm]"
 157  */
 158 static void __init
 159 parse_cmdline(struct meminfo *mi, char **cmdline_p, char *from)
 160 {
 161         char c = ' ', *to = command_line;
 162         int usermem = 0, len = 0;
 163
 164         for (;;) {
 165                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 166                         unsigned long size, start;
 167
 168                         if (to != command_line)
 169                                 to -= 1;
 170
 171                         /*
 172                          * If the user specifies memory size, we
 173                          * blow away any automatically generated
 174                          * size.
 175                          */
 176                         if (usermem == 0) {
 177                                 usermem = 1;
 178                                 mi->nr_banks = 0;
 179                         }
 180
 181                         start = PHYS_OFFSET;
 182                         size  = memparse(from + 4, &from);
 183                         if (*from == '@')
 184                                 start = memparse(from + 1, &from);
 185
 186                         mi->bank[mi->nr_banks].start = start;
 187                         mi->bank[mi->nr_banks].size  = size;
 188                         mi->bank[mi->nr_banks].node  = PHYS_TO_NID(start);
 189                         mi->nr_banks += 1;
 190                 }
 191                 c = *from++;
 192                 if (!c)
 193                         break;
 194                 if (COMMAND_LINE_SIZE <= ++len)
 195                         break;
 196                 *to++ = c;
 197         }
 198         *to = '\0';
 199         *cmdline_p = command_line;
 200 }
 201
 202 static void __init
 203 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 204 {
 205 #ifdef CONFIG_BLK_DEV_RAM
 206         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 207
 208         rd_image_start = image_start;
 209         rd_prompt = prompt;
 210         rd_doload = doload;
 211
 212         if (rd_sz)
 213                 rd_size = rd_sz;
 214 #endif
 215 }
 216
 217 static void __init
 218 request_standard_resources(struct meminfo *mi)
 219 {
 220         struct resource *res;
 221         int i;
 222
 223         kernel_code.start  = init_mm.start_code;
 224         kernel_code.end    = init_mm.end_code - 1;
 225 #ifdef CONFIG_XIP_KERNEL
 226         kernel_data.start  = init_mm.start_data;
 227 #else
 228         kernel_data.start  = init_mm.end_code;
 229 #endif
 230         kernel_data.end    = init_mm.brk - 1;
 231
 232         for (i = 0; i < mi->nr_banks; i++) {
 233                 unsigned long virt_start, virt_end;
 234
 235                 if (mi->bank[i].size == 0)
 236                         continue;
 237
 238                 virt_start = mi->bank[i].start;
 239                 virt_end   = virt_start + mi->bank[i].size - 1;
 240
 241                 res = alloc_bootmem_low(sizeof(*res));
 242                 res->name  = "System RAM";
 243                 res->start = virt_start;
 244                 res->end   = virt_end;
 245                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 246
 247                 request_resource(&iomem_resource, res);
 248
 249                 if (kernel_code.start >= res->start &&
 250                     kernel_code.end <= res->end)
 251                         request_resource(res, &kernel_code);
 252                 if (kernel_data.start >= res->start &&
 253                     kernel_data.end <= res->end)
 254                         request_resource(res, &kernel_data);
 255         }
 256
 257 /*      FIXME - needed? if (mdesc->video_start) {
 258                 video_ram.start = mdesc->video_start;
 259                 video_ram.end   = mdesc->video_end;
 260                 request_resource(&iomem_resource, &video_ram);
 261         }*/
 262
 263         /*
 264          * Some machines don't have the possibility of ever
 265          * possessing lp1 or lp2
 266          */
 267         if (0)  /* FIXME - need to do this for A5k at least */
 268                 request_resource(&ioport_resource, &lp0);
 269 }
 270
 271 /*
 272  *  Tag parsing.
 273  *
 274  * This is the new way of passing data to the kernel at boot time.  Rather
 275  * than passing a fixed inflexible structure to the kernel, we pass a list
 276  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 277  * tag for the list to be recognised (to distinguish the tagged list from
 278  * a param_struct).  The list is terminated with a zero-length tag (this tag
 279  * is not parsed in any way).
 280  */
 281 static int __init parse_tag_core(const struct tag *tag)
 282 {
 283         if (tag->hdr.size > 2) {
 284                 if ((tag->u.core.flags & 1) == 0)
 285                         root_mountflags &= ~MS_RDONLY;
 286                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 287         }
 288         return 0;
 289 }
 290
 291 __tagtable(ATAG_CORE, parse_tag_core);
 292
 293 static int __init parse_tag_mem32(const struct tag *tag)
 294 {
 295         if (meminfo.nr_banks >= NR_BANKS) {
 296                 printk(KERN_WARNING
 297                        "Ignoring memory bank 0x%08x size %dKB\n",
 298                         tag->u.mem.start, tag->u.mem.size / 1024);
 299                 return -EINVAL;
 300         }
 301         meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
 302         meminfo.bank[meminfo.nr_banks].size  = tag->u.mem.size;
 303         meminfo.bank[meminfo.nr_banks].node  = PHYS_TO_NID(tag->u.mem.start);
 304         meminfo.nr_banks += 1;
 305
 306         return 0;
 307 }
 308
 309 __tagtable(ATAG_MEM, parse_tag_mem32);
 310
 311 #if defined(CONFIG_DUMMY_CONSOLE)
 312 struct screen_info screen_info = {
 313  .orig_video_lines      = 30,
 314  .orig_video_cols       = 80,
 315  .orig_video_mode       = 0,
 316  .orig_video_ega_bx     = 0,
 317  .orig_video_isVGA      = 1,
 318  .orig_video_points     = 8
 319 };
 320
 321 static int __init parse_tag_videotext(const struct tag *tag)
 322 {
 323         screen_info.orig_x            = tag->u.videotext.x;
 324         screen_info.orig_y            = tag->u.videotext.y;
 325         screen_info.orig_video_page   = tag->u.videotext.video_page;
 326         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 327         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 328         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 329         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 330         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 331         screen_info.orig_video_points = tag->u.videotext.video_points;
 332         return 0;
 333 }
 334
 335 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 336 #endif
 337
 338 static int __init parse_tag_acorn(const struct tag *tag)
 339 {
 340         memc_ctrl_reg = tag->u.acorn.memc_control_reg;
 341         number_mfm_drives = tag->u.acorn.adfsdrives;
 342         return 0;
 343 }
 344
 345 __tagtable(ATAG_ACORN, parse_tag_acorn);
 346
 347 static int __init parse_tag_ramdisk(const struct tag *tag)
 348 {
 349         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 350                       (tag->u.ramdisk.flags & 2) == 0,
 351                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 352         return 0;
 353 }
 354
 355 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 356
 357 static int __init parse_tag_initrd(const struct tag *tag)
 358 {
 359         printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
 360         phys_initrd_start = (unsigned long)tag->u.initrd.start;
 361         phys_initrd_size = (unsigned long)tag->u.initrd.size;
 362         return 0;
 363 }
 364
 365 __tagtable(ATAG_INITRD, parse_tag_initrd);
 366
 367 static int __init parse_tag_initrd2(const struct tag *tag)
 368 {
 369         printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
 370         phys_initrd_start = (unsigned long)tag->u.initrd.start;
 371         phys_initrd_size = (unsigned long)tag->u.initrd.size;
 372         return 0;
 373 }
 374
 375 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 376
 377 static int __init parse_tag_serialnr(const struct tag *tag)
 378 {
 379         system_serial_low = tag->u.serialnr.low;
 380         system_serial_high = tag->u.serialnr.high;
 381         return 0;
 382 }
 383
 384 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 385
 386 static int __init parse_tag_revision(const struct tag *tag)
 387 {
 388         system_rev = tag->u.revision.rev;
 389         return 0;
 390 }
 391
 392 __tagtable(ATAG_REVISION, parse_tag_revision);
 393
 394 static int __init parse_tag_cmdline(const struct tag *tag)
 395 {
 396         strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 397         default_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 398         return 0;
 399 }
 400
 401 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 402
 403 /*
 404  * Scan the tag table for this tag, and call its parse function.
 405  * The tag table is built by the linker from all the __tagtable
 406  * declarations.
 407  */
 408 static int __init parse_tag(const struct tag *tag)
 409 {
 410         extern struct tagtable __tagtable_begin, __tagtable_end;
 411         struct tagtable *t;
 412
 413         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 414                 if (tag->hdr.tag == t->tag) {
 415                         t->parse(tag);
 416                         break;
 417                 }
 418
 419         return t < &__tagtable_end;
 420 }
 421
 422 /*
 423  * Parse all tags in the list, checking both the global and architecture
 424  * specific tag tables.
 425  */
 426 static void __init parse_tags(const struct tag *t)
 427 {
 428         for (; t->hdr.size; t = tag_next(t))
 429                 if (!parse_tag(t))
 430                         printk(KERN_WARNING
 431                                 "Ignoring unrecognised tag 0x%08x\n",
 432                                 t->hdr.tag);
 433 }
 434
 435 /*
 436  * This holds our defaults.
 437  */
 438 static struct init_tags {
 439         struct tag_header hdr1;
 440         struct tag_core   core;
 441         struct tag_header hdr2;
 442         struct tag_mem32  mem;
 443         struct tag_header hdr3;
 444 } init_tags __initdata = {
 445         { tag_size(tag_core), ATAG_CORE },
 446         { 1, PAGE_SIZE, 0xff },
 447         { tag_size(tag_mem32), ATAG_MEM },
 448         { MEM_SIZE, PHYS_OFFSET },
 449         { 0, ATAG_NONE }
 450 };
 451
 452 void __init setup_arch(char **cmdline_p)
 453 {
 454         struct tag *tags = (struct tag *)&init_tags;
 455         char *from = default_command_line;
 456
 457         setup_processor();
 458         if(machine_arch_type == MACH_TYPE_A5K)
 459                 machine_name = "A5000";
 460         else if(machine_arch_type == MACH_TYPE_ARCHIMEDES)
 461                 machine_name = "Archimedes";
 462         else
 463                 machine_name = "UNKNOWN";
 464
 465         //FIXME - the tag struct is always copied here but this is a block
 466         // of RAM that is accidentally reserved along with video RAM. perhaps
 467         // it would be a good idea to explicitly reserve this?
 468
 469         tags = (struct tag *)0x0207c000;
 470
 471         /*
 472          * If we have the old style parameters, convert them to
 473          * a tag list.
 474          */
 475         if (tags->hdr.tag != ATAG_CORE)
 476                 convert_to_tag_list(tags);
 477         if (tags->hdr.tag != ATAG_CORE)
 478                 tags = (struct tag *)&init_tags;
 479         if (tags->hdr.tag == ATAG_CORE) {
 480                 if (meminfo.nr_banks != 0)
 481                         squash_mem_tags(tags);
 482                 parse_tags(tags);
 483         }
 484
 485         init_mm.start_code = (unsigned long) &_text;
 486 #ifndef CONFIG_XIP_KERNEL
 487         init_mm.end_code   = (unsigned long) &_etext;
 488 #else
 489         init_mm.end_code   = (unsigned long) &_endtext;
 490         init_mm.start_data   = (unsigned long) &_sdata;
 491 #endif
 492         init_mm.end_data   = (unsigned long) &_edata;
 493         init_mm.brk        = (unsigned long) &_end;
 494
 495         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 496         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 497         parse_cmdline(&meminfo, cmdline_p, from);
 498         bootmem_init(&meminfo);
 499         paging_init(&meminfo);
 500         request_standard_resources(&meminfo);
 501
 502 #ifdef CONFIG_VT
 503 #if defined(CONFIG_DUMMY_CONSOLE)
 504         conswitchp = &dummy_con;
 505 #endif
 506 #endif
 507 }
 508
 509 static const char *hwcap_str[] = {
 510         "swp",
 511         "half",
 512         "thumb",
 513         "26bit",
 514         "fastmult",
 515         "fpa",
 516         "vfp",
 517         "edsp",
 518         NULL
 519 };
 520
 521 static int c_show(struct seq_file *m, void *v)
 522 {
 523         int i;
 524
 525         seq_printf(m, "Processor\t: %s %s rev %d (%s)\n",
 526                    proc_info.manufacturer, proc_info.cpu_name,
 527                    (int)processor_id & 15, elf_platform);
 528
 529         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 530                    loops_per_jiffy / (500000/HZ),
 531                    (loops_per_jiffy / (5000/HZ)) % 100);
 532
 533         /* dump out the processor features */
 534         seq_puts(m, "Features\t: ");
 535
 536         for (i = 0; hwcap_str[i]; i++)
 537                 if (elf_hwcap & (1 << i))
 538                         seq_printf(m, "%s ", hwcap_str[i]);
 539
 540         seq_puts(m, "\n");
 541
 542         seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
 543         seq_printf(m, "CPU revision\t: %d\n\n", processor_id & 15);
 544         seq_printf(m, "Hardware\t: %s\n", machine_name);
 545         seq_printf(m, "Revision\t: %04x\n", system_rev);
 546         seq_printf(m, "Serial\t\t: %08x%08x\n",
 547                    system_serial_high, system_serial_low);
 548
 549         return 0;
 550 }
 551
 552 static void *c_start(struct seq_file *m, loff_t *pos)
 553 {
 554         return *pos < 1 ? (void *)1 : NULL;
 555 }
 556
 557 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 558 {
 559         ++*pos;
 560         return NULL;
 561 }
 562
 563 static void c_stop(struct seq_file *m, void *v)
 564 {
 565 }
 566
 567 struct seq_operations cpuinfo_op = {
 568         .start  = c_start,
 569         .next   = c_next,
 570         .stop   = c_stop,
 571         .show   = c_show
 572 };