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/config.h>
  12 #include <linux/kernel.h>
  13 #include <linux/stddef.h>
  14 #include <linux/ioport.h>
  15 #include <linux/delay.h>
  16 #include <linux/utsname.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/console.h>
  19 #include <linux/bootmem.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/tty.h>
  22 #include <linux/init.h>
  23 #include <linux/root_dev.h>
  24
  25 #include <asm/elf.h>
  26 #include <asm/hardware.h>
  27 #include <asm/io.h>
  28 #include <asm/procinfo.h>
  29 #include <asm/setup.h>
  30 #include <asm/mach-types.h>
  31 #include <asm/tlbflush.h>
  32
  33 #include <asm/irqchip.h>
  34
  35 #ifndef MEM_SIZE
  36 #define MEM_SIZE        (16*1024*1024)
  37 #endif
  38
  39 #ifdef CONFIG_PREEMPT
  40 DEFINE_SPINLOCK(kernel_flag);
  41 #endif
  42
  43 #if defined(CONFIG_FPE_NWFPE)
  44 char fpe_type[8];
  45
  46 static int __init fpe_setup(char *line)
  47 {
  48         memcpy(fpe_type, line, 8);
  49         return 1;
  50 }
  51
  52 __setup("fpe=", fpe_setup);
  53 #endif
  54
  55 extern void paging_init(struct meminfo *);
  56 extern void convert_to_tag_list(struct tag *tags);
  57 extern void squash_mem_tags(struct tag *tag);
  58 extern void bootmem_init(struct meminfo *);
  59 extern int root_mountflags;
  60 extern int _stext, _text, _etext, _edata, _end;
  61 #ifdef CONFIG_XIP_KERNEL
  62 extern int _endtext, _sdata;
  63 #endif
  64
  65
  66 unsigned int processor_id;
  67 unsigned int __machine_arch_type;
  68 unsigned int system_rev;
  69 unsigned int system_serial_low;
  70 unsigned int system_serial_high;
  71 unsigned int elf_hwcap;
  72 unsigned int memc_ctrl_reg;
  73 unsigned int number_mfm_drives;
  74
  75 struct processor processor;
  76
  77 char elf_platform[ELF_PLATFORM_SIZE];
  78
  79 unsigned long phys_initrd_start __initdata = 0;
  80 unsigned long phys_initrd_size __initdata = 0;
  81 static struct meminfo meminfo __initdata = { 0, };
  82 static struct proc_info_item proc_info;
  83 static const char *machine_name;
  84 static char command_line[COMMAND_LINE_SIZE];
  85
  86 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  87
  88 /*
  89  * Standard memory resources
  90  */
  91 static struct resource mem_res[] = {
  92         { "Video RAM",   0,     0,     IORESOURCE_MEM                   },
  93         { "Kernel code", 0,     0,     IORESOURCE_MEM                   },
  94         { "Kernel data", 0,     0,     IORESOURCE_MEM                   }
  95 };
  96
  97 #define video_ram   mem_res[0]
  98 #define kernel_code mem_res[1]
  99 #define kernel_data mem_res[2]
 100
 101 static struct resource io_res[] = {
 102         { "reserved",    0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
 103         { "reserved",    0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
 104         { "reserved",    0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
 105 };
 106
 107 #define lp0 io_res[0]
 108 #define lp1 io_res[1]
 109 #define lp2 io_res[2]
 110
 111 #define dump_cpu_info() do { } while (0)
 112
 113 static void __init setup_processor(void)
 114 {
 115         extern struct proc_info_list __proc_info_begin, __proc_info_end;
 116         struct proc_info_list *list;
 117
 118         /*
 119          * locate processor in the list of supported processor
 120          * types.  The linker builds this table for us from the
 121          * entries in arch/arm26/mm/proc-*.S
 122          */
 123         for (list = &__proc_info_begin; list < &__proc_info_end ; list++)
 124                 if ((processor_id & list->cpu_mask) == list->cpu_val)
 125                         break;
 126
 127         /*
 128          * If processor type is unrecognised, then we
 129          * can do nothing...
 130          */
 131         if (list >= &__proc_info_end) {
 132                 printk("CPU configuration botched (ID %08x), unable "
 133                        "to continue.\n", processor_id);
 134                 while (1);
 135         }
 136
 137         proc_info = *list->info;
 138         processor = *list->proc;
 139
 140
 141         printk("CPU: %s %s revision %d\n",
 142                proc_info.manufacturer, proc_info.cpu_name,
 143                (int)processor_id & 15);
 144
 145         dump_cpu_info();
 146
 147         sprintf(system_utsname.machine, "%s", list->arch_name);
 148         sprintf(elf_platform, "%s", list->elf_name);
 149         elf_hwcap = list->elf_hwcap;
 150
 151         cpu_proc_init();
 152 }
 153
 154 /*
 155  * Initial parsing of the command line.  We need to pick out the
 156  * memory size.  We look for mem=size@start, where start and size
 157  * are "size[KkMm]"
 158  */
 159 static void __init
 160 parse_cmdline(struct meminfo *mi, char **cmdline_p, char *from)
 161 {
 162         char c = ' ', *to = command_line;
 163         int usermem = 0, len = 0;
 164
 165         for (;;) {
 166                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 167                         unsigned long size, start;
 168
 169                         if (to != command_line)
 170                                 to -= 1;
 171
 172                         /*
 173                          * If the user specifies memory size, we
 174                          * blow away any automatically generated
 175                          * size.
 176                          */
 177                         if (usermem == 0) {
 178                                 usermem = 1;
 179                                 mi->nr_banks = 0;
 180                         }
 181
 182                         start = PHYS_OFFSET;
 183                         size  = memparse(from + 4, &from);
 184                         if (*from == '@')
 185                                 start = memparse(from + 1, &from);
 186
 187                         mi->bank[mi->nr_banks].start = start;
 188                         mi->bank[mi->nr_banks].size  = size;
 189                         mi->bank[mi->nr_banks].node  = PHYS_TO_NID(start);
 190                         mi->nr_banks += 1;
 191                 }
 192                 c = *from++;
 193                 if (!c)
 194                         break;
 195                 if (COMMAND_LINE_SIZE <= ++len)
 196                         break;
 197                 *to++ = c;
 198         }
 199         *to = '\0';
 200         *cmdline_p = command_line;
 201 }
 202
 203 static void __init
 204 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 205 {
 206 #ifdef CONFIG_BLK_DEV_RAM
 207         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 208
 209         rd_image_start = image_start;
 210         rd_prompt = prompt;
 211         rd_doload = doload;
 212
 213         if (rd_sz)
 214                 rd_size = rd_sz;
 215 #endif
 216 }
 217
 218 static void __init
 219 request_standard_resources(struct meminfo *mi)
 220 {
 221         struct resource *res;
 222         int i;
 223
 224         kernel_code.start  = init_mm.start_code;
 225         kernel_code.end    = init_mm.end_code - 1;
 226 #ifdef CONFIG_XIP_KERNEL
 227         kernel_data.start  = init_mm.start_data;
 228 #else
 229         kernel_data.start  = init_mm.end_code;
 230 #endif
 231         kernel_data.end    = init_mm.brk - 1;
 232
 233         for (i = 0; i < mi->nr_banks; i++) {
 234                 unsigned long virt_start, virt_end;
 235
 236                 if (mi->bank[i].size == 0)
 237                         continue;
 238
 239                 virt_start = mi->bank[i].start;
 240                 virt_end   = virt_start + mi->bank[i].size - 1;
 241
 242                 res = alloc_bootmem_low(sizeof(*res));
 243                 res->name  = "System RAM";
 244                 res->start = virt_start;
 245                 res->end   = virt_end;
 246                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 247
 248                 request_resource(&iomem_resource, res);
 249
 250                 if (kernel_code.start >= res->start &&
 251                     kernel_code.end <= res->end)
 252                         request_resource(res, &kernel_code);
 253                 if (kernel_data.start >= res->start &&
 254                     kernel_data.end <= res->end)
 255                         request_resource(res, &kernel_data);
 256         }
 257
 258 /*      FIXME - needed? if (mdesc->video_start) {
 259                 video_ram.start = mdesc->video_start;
 260                 video_ram.end   = mdesc->video_end;
 261                 request_resource(&iomem_resource, &video_ram);
 262         }*/
 263
 264         /*
 265          * Some machines don't have the possibility of ever
 266          * possessing lp1 or lp2
 267          */
 268         if (0)  /* FIXME - need to do this for A5k at least */
 269                 request_resource(&ioport_resource, &lp0);
 270 }
 271
 272 /*
 273  *  Tag parsing.
 274  *
 275  * This is the new way of passing data to the kernel at boot time.  Rather
 276  * than passing a fixed inflexible structure to the kernel, we pass a list
 277  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 278  * tag for the list to be recognised (to distinguish the tagged list from
 279  * a param_struct).  The list is terminated with a zero-length tag (this tag
 280  * is not parsed in any way).
 281  */
 282 static int __init parse_tag_core(const struct tag *tag)
 283 {
 284         if (tag->hdr.size > 2) {
 285                 if ((tag->u.core.flags & 1) == 0)
 286                         root_mountflags &= ~MS_RDONLY;
 287                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 288         }
 289         return 0;
 290 }
 291
 292 __tagtable(ATAG_CORE, parse_tag_core);
 293
 294 static int __init parse_tag_mem32(const struct tag *tag)
 295 {
 296         if (meminfo.nr_banks >= NR_BANKS) {
 297                 printk(KERN_WARNING
 298                        "Ignoring memory bank 0x%08x size %dKB\n",
 299                         tag->u.mem.start, tag->u.mem.size / 1024);
 300                 return -EINVAL;
 301         }
 302         meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
 303         meminfo.bank[meminfo.nr_banks].size  = tag->u.mem.size;
 304         meminfo.bank[meminfo.nr_banks].node  = PHYS_TO_NID(tag->u.mem.start);
 305         meminfo.nr_banks += 1;
 306
 307         return 0;
 308 }
 309
 310 __tagtable(ATAG_MEM, parse_tag_mem32);
 311
 312 #if defined(CONFIG_DUMMY_CONSOLE)
 313 struct screen_info screen_info = {
 314  .orig_video_lines      = 30,
 315  .orig_video_cols       = 80,
 316  .orig_video_mode       = 0,
 317  .orig_video_ega_bx     = 0,
 318  .orig_video_isVGA      = 1,
 319  .orig_video_points     = 8
 320 };
 321
 322 static int __init parse_tag_videotext(const struct tag *tag)
 323 {
 324         screen_info.orig_x            = tag->u.videotext.x;
 325         screen_info.orig_y            = tag->u.videotext.y;
 326         screen_info.orig_video_page   = tag->u.videotext.video_page;
 327         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 328         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 329         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 330         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 331         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 332         screen_info.orig_video_points = tag->u.videotext.video_points;
 333         return 0;
 334 }
 335
 336 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 337 #endif
 338
 339 static int __init parse_tag_acorn(const struct tag *tag)
 340 {
 341         memc_ctrl_reg = tag->u.acorn.memc_control_reg;
 342         number_mfm_drives = tag->u.acorn.adfsdrives;
 343         return 0;
 344 }
 345
 346 __tagtable(ATAG_ACORN, parse_tag_acorn);
 347
 348 static int __init parse_tag_ramdisk(const struct tag *tag)
 349 {
 350         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 351                       (tag->u.ramdisk.flags & 2) == 0,
 352                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 353         return 0;
 354 }
 355
 356 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 357
 358 static int __init parse_tag_initrd(const struct tag *tag)
 359 {
 360         printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
 361         phys_initrd_start = (unsigned long)tag->u.initrd.start;
 362         phys_initrd_size = (unsigned long)tag->u.initrd.size;
 363         return 0;
 364 }
 365
 366 __tagtable(ATAG_INITRD, parse_tag_initrd);
 367
 368 static int __init parse_tag_initrd2(const struct tag *tag)
 369 {
 370         printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
 371         phys_initrd_start = (unsigned long)tag->u.initrd.start;
 372         phys_initrd_size = (unsigned long)tag->u.initrd.size;
 373         return 0;
 374 }
 375
 376 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 377
 378 static int __init parse_tag_serialnr(const struct tag *tag)
 379 {
 380         system_serial_low = tag->u.serialnr.low;
 381         system_serial_high = tag->u.serialnr.high;
 382         return 0;
 383 }
 384
 385 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 386
 387 static int __init parse_tag_revision(const struct tag *tag)
 388 {
 389         system_rev = tag->u.revision.rev;
 390         return 0;
 391 }
 392
 393 __tagtable(ATAG_REVISION, parse_tag_revision);
 394
 395 static int __init parse_tag_cmdline(const struct tag *tag)
 396 {
 397         strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 398         default_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 399         return 0;
 400 }
 401
 402 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 403
 404 /*
 405  * Scan the tag table for this tag, and call its parse function.
 406  * The tag table is built by the linker from all the __tagtable
 407  * declarations.
 408  */
 409 static int __init parse_tag(const struct tag *tag)
 410 {
 411         extern struct tagtable __tagtable_begin, __tagtable_end;
 412         struct tagtable *t;
 413
 414         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 415                 if (tag->hdr.tag == t->tag) {
 416                         t->parse(tag);
 417                         break;
 418                 }
 419
 420         return t < &__tagtable_end;
 421 }
 422
 423 /*
 424  * Parse all tags in the list, checking both the global and architecture
 425  * specific tag tables.
 426  */
 427 static void __init parse_tags(const struct tag *t)
 428 {
 429         for (; t->hdr.size; t = tag_next(t))
 430                 if (!parse_tag(t))
 431                         printk(KERN_WARNING
 432                                 "Ignoring unrecognised tag 0x%08x\n",
 433                                 t->hdr.tag);
 434 }
 435
 436 /*
 437  * This holds our defaults.
 438  */
 439 static struct init_tags {
 440         struct tag_header hdr1;
 441         struct tag_core   core;
 442         struct tag_header hdr2;
 443         struct tag_mem32  mem;
 444         struct tag_header hdr3;
 445 } init_tags __initdata = {
 446         { tag_size(tag_core), ATAG_CORE },
 447         { 1, PAGE_SIZE, 0xff },
 448         { tag_size(tag_mem32), ATAG_MEM },
 449         { MEM_SIZE, PHYS_OFFSET },
 450         { 0, ATAG_NONE }
 451 };
 452
 453 void __init setup_arch(char **cmdline_p)
 454 {
 455         struct tag *tags = (struct tag *)&init_tags;
 456         char *from = default_command_line;
 457
 458         setup_processor();
 459         if(machine_arch_type == MACH_TYPE_A5K)
 460                 machine_name = "A5000";
 461         else if(machine_arch_type == MACH_TYPE_ARCHIMEDES)
 462                 machine_name = "Archimedes";
 463         else
 464                 machine_name = "UNKNOWN";
 465
 466         //FIXME - the tag struct is always copied here but this is a block
 467         // of RAM that is accidentally reserved along with video RAM. perhaps
 468         // it would be a good idea to explicitly reserve this?
 469
 470         tags = (struct tag *)0x0207c000;
 471
 472         /*
 473          * If we have the old style parameters, convert them to
 474          * a tag list.
 475          */
 476         if (tags->hdr.tag != ATAG_CORE)
 477                 convert_to_tag_list(tags);
 478         if (tags->hdr.tag != ATAG_CORE)
 479                 tags = (struct tag *)&init_tags;
 480         if (tags->hdr.tag == ATAG_CORE) {
 481                 if (meminfo.nr_banks != 0)
 482                         squash_mem_tags(tags);
 483                 parse_tags(tags);
 484         }
 485
 486         init_mm.start_code = (unsigned long) &_text;
 487 #ifndef CONFIG_XIP_KERNEL
 488         init_mm.end_code   = (unsigned long) &_etext;
 489 #else
 490         init_mm.end_code   = (unsigned long) &_endtext;
 491         init_mm.start_data   = (unsigned long) &_sdata;
 492 #endif
 493         init_mm.end_data   = (unsigned long) &_edata;
 494         init_mm.brk        = (unsigned long) &_end;
 495
 496         memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
 497         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 498         parse_cmdline(&meminfo, cmdline_p, from);
 499         bootmem_init(&meminfo);
 500         paging_init(&meminfo);
 501         request_standard_resources(&meminfo);
 502
 503 #ifdef CONFIG_VT
 504 #if defined(CONFIG_DUMMY_CONSOLE)
 505         conswitchp = &dummy_con;
 506 #endif
 507 #endif
 508 }
 509
 510 static const char *hwcap_str[] = {
 511         "swp",
 512         "half",
 513         "thumb",
 514         "26bit",
 515         "fastmult",
 516         "fpa",
 517         "vfp",
 518         "edsp",
 519         NULL
 520 };
 521
 522 static int c_show(struct seq_file *m, void *v)
 523 {
 524         int i;
 525
 526         seq_printf(m, "Processor\t: %s %s rev %d (%s)\n",
 527                    proc_info.manufacturer, proc_info.cpu_name,
 528                    (int)processor_id & 15, elf_platform);
 529
 530         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 531                    loops_per_jiffy / (500000/HZ),
 532                    (loops_per_jiffy / (5000/HZ)) % 100);
 533
 534         /* dump out the processor features */
 535         seq_puts(m, "Features\t: ");
 536
 537         for (i = 0; hwcap_str[i]; i++)
 538                 if (elf_hwcap & (1 << i))
 539                         seq_printf(m, "%s ", hwcap_str[i]);
 540
 541         seq_puts(m, "\n");
 542
 543         seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
 544         seq_printf(m, "CPU revision\t: %d\n\n", processor_id & 15);
 545         seq_printf(m, "Hardware\t: %s\n", machine_name);
 546         seq_printf(m, "Revision\t: %04x\n", system_rev);
 547         seq_printf(m, "Serial\t\t: %08x%08x\n",
 548                    system_serial_high, system_serial_low);
 549
 550         return 0;
 551 }
 552
 553 static void *c_start(struct seq_file *m, loff_t *pos)
 554 {
 555         return *pos < 1 ? (void *)1 : NULL;
 556 }
 557
 558 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 559 {
 560         ++*pos;
 561         return NULL;
 562 }
 563
 564 static void c_stop(struct seq_file *m, void *v)
 565 {
 566 }
 567
 568 struct seq_operations cpuinfo_op = {
 569         .start  = c_start,
 570         .next   = c_next,
 571         .stop   = c_stop,
 572         .show   = c_show
 573 };