1 /* 2 * linux/arch/sh/kernel/setup.c 3 * 4 * Copyright (C) 1999 Niibe Yutaka 5 * Copyright (C) 2002, 2003 Paul Mundt 6 */ 7 8 /* 9 * This file handles the architecture-dependent parts of initialization 10 */ 11 12 #include <linux/screen_info.h> 13 #include <linux/ioport.h> 14 #include <linux/init.h> 15 #include <linux/initrd.h> 16 #include <linux/bootmem.h> 17 #include <linux/console.h> 18 #include <linux/seq_file.h> 19 #include <linux/root_dev.h> 20 #include <linux/utsname.h> 21 #include <linux/cpu.h> 22 #include <linux/pfn.h> 23 #include <linux/fs.h> 24 #include <asm/uaccess.h> 25 #include <asm/io.h> 26 #include <asm/sections.h> 27 #include <asm/irq.h> 28 #include <asm/setup.h> 29 #include <asm/clock.h> 30 31 #ifdef CONFIG_SH_KGDB 32 #include <asm/kgdb.h> 33 static int kgdb_parse_options(char *options); 34 #endif 35 extern void * __rd_start, * __rd_end; 36 /* 37 * Machine setup.. 38 */ 39 40 /* 41 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 42 * This value will be used at the very early stage of serial setup. 43 * The bigger value means no problem. 44 */ 45 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, }; 46 #ifdef CONFIG_VT 47 struct screen_info screen_info; 48 #endif 49 50 #if defined(CONFIG_SH_UNKNOWN) 51 struct sh_machine_vector sh_mv; 52 #endif 53 54 extern int root_mountflags; 55 56 #define MV_NAME_SIZE 32 57 58 static struct sh_machine_vector* __init get_mv_byname(const char* name); 59 60 /* 61 * This is set up by the setup-routine at boot-time 62 */ 63 #define PARAM ((unsigned char *)empty_zero_page) 64 65 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000)) 66 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004)) 67 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008)) 68 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c)) 69 #define INITRD_START (*(unsigned long *) (PARAM+0x010)) 70 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014)) 71 /* ... */ 72 #define COMMAND_LINE ((char *) (PARAM+0x100)) 73 74 #define RAMDISK_IMAGE_START_MASK 0x07FF 75 #define RAMDISK_PROMPT_FLAG 0x8000 76 #define RAMDISK_LOAD_FLAG 0x4000 77 78 static char command_line[COMMAND_LINE_SIZE] = { 0, }; 79 80 static struct resource code_resource = { .name = "Kernel code", }; 81 static struct resource data_resource = { .name = "Kernel data", }; 82 83 unsigned long memory_start, memory_end; 84 85 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE], 86 struct sh_machine_vector** mvp, 87 unsigned long *mv_io_base, 88 int *mv_mmio_enable) 89 { 90 char c = ' ', *to = command_line, *from = COMMAND_LINE; 91 int len = 0; 92 93 /* Save unparsed command line copy for /proc/cmdline */ 94 memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 95 saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; 96 97 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START; 98 memory_end = memory_start + __MEMORY_SIZE; 99 100 for (;;) { 101 /* 102 * "mem=XXX[kKmM]" defines a size of memory. 103 */ 104 if (c == ' ' && !memcmp(from, "mem=", 4)) { 105 if (to != command_line) 106 to--; 107 { 108 unsigned long mem_size; 109 110 mem_size = memparse(from+4, &from); 111 memory_end = memory_start + mem_size; 112 } 113 } 114 115 #ifdef CONFIG_EARLY_PRINTK 116 if (c == ' ' && !memcmp(from, "earlyprintk=", 12)) { 117 char *ep_end; 118 119 if (to != command_line) 120 to--; 121 122 from += 12; 123 ep_end = strchr(from, ' '); 124 125 setup_early_printk(from); 126 printk("early console enabled\n"); 127 128 from = ep_end; 129 } 130 #endif 131 132 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) { 133 char* mv_end; 134 char* mv_comma; 135 int mv_len; 136 if (to != command_line) 137 to--; 138 from += 6; 139 mv_end = strchr(from, ' '); 140 if (mv_end == NULL) 141 mv_end = from + strlen(from); 142 143 mv_comma = strchr(from, ','); 144 if ((mv_comma != NULL) && (mv_comma < mv_end)) { 145 int ints[3]; 146 get_options(mv_comma+1, ARRAY_SIZE(ints), ints); 147 *mv_io_base = ints[1]; 148 *mv_mmio_enable = ints[2]; 149 mv_len = mv_comma - from; 150 } else { 151 mv_len = mv_end - from; 152 } 153 if (mv_len > (MV_NAME_SIZE-1)) 154 mv_len = MV_NAME_SIZE-1; 155 memcpy(mv_name, from, mv_len); 156 mv_name[mv_len] = '\0'; 157 from = mv_end; 158 159 *mvp = get_mv_byname(mv_name); 160 } 161 c = *(from++); 162 if (!c) 163 break; 164 if (COMMAND_LINE_SIZE <= ++len) 165 break; 166 *(to++) = c; 167 } 168 *to = '\0'; 169 *cmdline_p = command_line; 170 } 171 172 static int __init sh_mv_setup(char **cmdline_p) 173 { 174 #ifdef CONFIG_SH_UNKNOWN 175 extern struct sh_machine_vector mv_unknown; 176 #endif 177 struct sh_machine_vector *mv = NULL; 178 char mv_name[MV_NAME_SIZE] = ""; 179 unsigned long mv_io_base = 0; 180 int mv_mmio_enable = 0; 181 182 parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable); 183 184 #ifdef CONFIG_SH_UNKNOWN 185 if (mv == NULL) { 186 mv = &mv_unknown; 187 if (*mv_name != '\0') { 188 printk("Warning: Unsupported machine %s, using unknown\n", 189 mv_name); 190 } 191 } 192 sh_mv = *mv; 193 #endif 194 195 /* 196 * Manually walk the vec, fill in anything that the board hasn't yet 197 * by hand, wrapping to the generic implementation. 198 */ 199 #define mv_set(elem) do { \ 200 if (!sh_mv.mv_##elem) \ 201 sh_mv.mv_##elem = generic_##elem; \ 202 } while (0) 203 204 mv_set(inb); mv_set(inw); mv_set(inl); 205 mv_set(outb); mv_set(outw); mv_set(outl); 206 207 mv_set(inb_p); mv_set(inw_p); mv_set(inl_p); 208 mv_set(outb_p); mv_set(outw_p); mv_set(outl_p); 209 210 mv_set(insb); mv_set(insw); mv_set(insl); 211 mv_set(outsb); mv_set(outsw); mv_set(outsl); 212 213 mv_set(readb); mv_set(readw); mv_set(readl); 214 mv_set(writeb); mv_set(writew); mv_set(writel); 215 216 mv_set(ioport_map); 217 mv_set(ioport_unmap); 218 mv_set(irq_demux); 219 220 #ifdef CONFIG_SH_UNKNOWN 221 __set_io_port_base(mv_io_base); 222 #endif 223 224 if (!sh_mv.mv_nr_irqs) 225 sh_mv.mv_nr_irqs = NR_IRQS; 226 227 return 0; 228 } 229 230 void __init setup_arch(char **cmdline_p) 231 { 232 unsigned long bootmap_size; 233 unsigned long start_pfn, max_pfn, max_low_pfn; 234 235 #ifdef CONFIG_CMDLINE_BOOL 236 strcpy(COMMAND_LINE, CONFIG_CMDLINE); 237 #endif 238 239 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 240 241 #ifdef CONFIG_BLK_DEV_RAM 242 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 243 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 244 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 245 #endif 246 247 if (!MOUNT_ROOT_RDONLY) 248 root_mountflags &= ~MS_RDONLY; 249 init_mm.start_code = (unsigned long) _text; 250 init_mm.end_code = (unsigned long) _etext; 251 init_mm.end_data = (unsigned long) _edata; 252 init_mm.brk = (unsigned long) _end; 253 254 code_resource.start = (unsigned long)virt_to_phys(_text); 255 code_resource.end = (unsigned long)virt_to_phys(_etext)-1; 256 data_resource.start = (unsigned long)virt_to_phys(_etext); 257 data_resource.end = (unsigned long)virt_to_phys(_edata)-1; 258 259 sh_mv_setup(cmdline_p); 260 261 /* 262 * Find the highest page frame number we have available 263 */ 264 max_pfn = PFN_DOWN(__pa(memory_end)); 265 266 /* 267 * Determine low and high memory ranges: 268 */ 269 max_low_pfn = max_pfn; 270 271 /* 272 * Partially used pages are not usable - thus 273 * we are rounding upwards: 274 */ 275 start_pfn = PFN_UP(__pa(_end)); 276 277 /* 278 * Find a proper area for the bootmem bitmap. After this 279 * bootstrap step all allocations (until the page allocator 280 * is intact) must be done via bootmem_alloc(). 281 */ 282 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn, 283 __MEMORY_START>>PAGE_SHIFT, 284 max_low_pfn); 285 /* 286 * Register fully available low RAM pages with the bootmem allocator. 287 */ 288 { 289 unsigned long curr_pfn, last_pfn, pages; 290 291 /* 292 * We are rounding up the start address of usable memory: 293 */ 294 curr_pfn = PFN_UP(__MEMORY_START); 295 /* 296 * ... and at the end of the usable range downwards: 297 */ 298 last_pfn = PFN_DOWN(__pa(memory_end)); 299 300 if (last_pfn > max_low_pfn) 301 last_pfn = max_low_pfn; 302 303 pages = last_pfn - curr_pfn; 304 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn), 305 PFN_PHYS(pages)); 306 } 307 308 /* 309 * Reserve the kernel text and 310 * Reserve the bootmem bitmap. We do this in two steps (first step 311 * was init_bootmem()), because this catches the (definitely buggy) 312 * case of us accidentally initializing the bootmem allocator with 313 * an invalid RAM area. 314 */ 315 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE, 316 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START); 317 318 /* 319 * reserve physical page 0 - it's a special BIOS page on many boxes, 320 * enabling clean reboots, SMP operation, laptop functions. 321 */ 322 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE); 323 324 #ifdef CONFIG_BLK_DEV_INITRD 325 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); 326 if (&__rd_start != &__rd_end) { 327 LOADER_TYPE = 1; 328 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START; 329 INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start; 330 } 331 332 if (LOADER_TYPE && INITRD_START) { 333 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { 334 reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE); 335 initrd_start = 336 INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0; 337 initrd_end = initrd_start + INITRD_SIZE; 338 } else { 339 printk("initrd extends beyond end of memory " 340 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 341 INITRD_START + INITRD_SIZE, 342 max_low_pfn << PAGE_SHIFT); 343 initrd_start = 0; 344 } 345 } 346 #endif 347 348 #ifdef CONFIG_DUMMY_CONSOLE 349 conswitchp = &dummy_con; 350 #endif 351 352 /* Perform the machine specific initialisation */ 353 if (likely(sh_mv.mv_setup)) 354 sh_mv.mv_setup(cmdline_p); 355 356 paging_init(); 357 } 358 359 struct sh_machine_vector* __init get_mv_byname(const char* name) 360 { 361 extern long __machvec_start, __machvec_end; 362 struct sh_machine_vector *all_vecs = 363 (struct sh_machine_vector *)&__machvec_start; 364 365 int i, n = ((unsigned long)&__machvec_end 366 - (unsigned long)&__machvec_start)/ 367 sizeof(struct sh_machine_vector); 368 369 for (i = 0; i < n; ++i) { 370 struct sh_machine_vector *mv = &all_vecs[i]; 371 if (mv == NULL) 372 continue; 373 if (strcasecmp(name, get_system_type()) == 0) { 374 return mv; 375 } 376 } 377 return NULL; 378 } 379 380 static struct cpu cpu[NR_CPUS]; 381 382 static int __init topology_init(void) 383 { 384 int cpu_id; 385 386 for_each_possible_cpu(cpu_id) 387 register_cpu(&cpu[cpu_id], cpu_id); 388 389 return 0; 390 } 391 392 subsys_initcall(topology_init); 393 394 static const char *cpu_name[] = { 395 [CPU_SH7604] = "SH7604", [CPU_SH7300] = "SH7300", 396 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706", 397 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708", 398 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710", 399 [CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750", 400 [CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R", 401 [CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R", 402 [CPU_SH7760] = "SH7760", [CPU_SH73180] = "SH73180", 403 [CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1", 404 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501", 405 [CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780", 406 [CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343", 407 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619", 408 [CPU_SH_NONE] = "Unknown" 409 }; 410 411 const char *get_cpu_subtype(void) 412 { 413 return cpu_name[boot_cpu_data.type]; 414 } 415 416 #ifdef CONFIG_PROC_FS 417 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */ 418 static const char *cpu_flags[] = { 419 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", 420 "ptea", "llsc", "l2", NULL 421 }; 422 423 static void show_cpuflags(struct seq_file *m) 424 { 425 unsigned long i; 426 427 seq_printf(m, "cpu flags\t:"); 428 429 if (!cpu_data->flags) { 430 seq_printf(m, " %s\n", cpu_flags[0]); 431 return; 432 } 433 434 for (i = 0; cpu_flags[i]; i++) 435 if ((cpu_data->flags & (1 << i))) 436 seq_printf(m, " %s", cpu_flags[i+1]); 437 438 seq_printf(m, "\n"); 439 } 440 441 static void show_cacheinfo(struct seq_file *m, const char *type, 442 struct cache_info info) 443 { 444 unsigned int cache_size; 445 446 cache_size = info.ways * info.sets * info.linesz; 447 448 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n", 449 type, cache_size >> 10, info.ways); 450 } 451 452 /* 453 * Get CPU information for use by the procfs. 454 */ 455 static int show_cpuinfo(struct seq_file *m, void *v) 456 { 457 unsigned int cpu = smp_processor_id(); 458 459 if (!cpu && cpu_online(cpu)) 460 seq_printf(m, "machine\t\t: %s\n", get_system_type()); 461 462 seq_printf(m, "processor\t: %d\n", cpu); 463 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine); 464 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype()); 465 466 show_cpuflags(m); 467 468 seq_printf(m, "cache type\t: "); 469 470 /* 471 * Check for what type of cache we have, we support both the 472 * unified cache on the SH-2 and SH-3, as well as the harvard 473 * style cache on the SH-4. 474 */ 475 if (boot_cpu_data.icache.flags & SH_CACHE_COMBINED) { 476 seq_printf(m, "unified\n"); 477 show_cacheinfo(m, "cache", boot_cpu_data.icache); 478 } else { 479 seq_printf(m, "split (harvard)\n"); 480 show_cacheinfo(m, "icache", boot_cpu_data.icache); 481 show_cacheinfo(m, "dcache", boot_cpu_data.dcache); 482 } 483 484 /* Optional secondary cache */ 485 if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) 486 show_cacheinfo(m, "scache", boot_cpu_data.scache); 487 488 seq_printf(m, "bogomips\t: %lu.%02lu\n", 489 boot_cpu_data.loops_per_jiffy/(500000/HZ), 490 (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100); 491 492 return show_clocks(m); 493 } 494 495 static void *c_start(struct seq_file *m, loff_t *pos) 496 { 497 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 498 } 499 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 500 { 501 ++*pos; 502 return c_start(m, pos); 503 } 504 static void c_stop(struct seq_file *m, void *v) 505 { 506 } 507 struct seq_operations cpuinfo_op = { 508 .start = c_start, 509 .next = c_next, 510 .stop = c_stop, 511 .show = show_cpuinfo, 512 }; 513 #endif /* CONFIG_PROC_FS */ 514 515 #ifdef CONFIG_SH_KGDB 516 /* 517 * Parse command-line kgdb options. By default KGDB is enabled, 518 * entered on error (or other action) using default serial info. 519 * The command-line option can include a serial port specification 520 * and an action to override default or configured behavior. 521 */ 522 struct kgdb_sermap kgdb_sci_sermap = 523 { "ttySC", 5, kgdb_sci_setup, NULL }; 524 525 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap; 526 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap; 527 528 void kgdb_register_sermap(struct kgdb_sermap *map) 529 { 530 struct kgdb_sermap *last; 531 532 for (last = kgdb_serlist; last->next; last = last->next) 533 ; 534 last->next = map; 535 if (!map->namelen) { 536 map->namelen = strlen(map->name); 537 } 538 } 539 540 static int __init kgdb_parse_options(char *options) 541 { 542 char c; 543 int baud; 544 545 /* Check for port spec (or use default) */ 546 547 /* Determine port type and instance */ 548 if (!memcmp(options, "tty", 3)) { 549 struct kgdb_sermap *map = kgdb_serlist; 550 551 while (map && memcmp(options, map->name, map->namelen)) 552 map = map->next; 553 554 if (!map) { 555 KGDB_PRINTK("unknown port spec in %s\n", options); 556 return -1; 557 } 558 559 kgdb_porttype = map; 560 kgdb_serial_setup = map->setup_fn; 561 kgdb_portnum = options[map->namelen] - '0'; 562 options += map->namelen + 1; 563 564 options = (*options == ',') ? options+1 : options; 565 566 /* Read optional parameters (baud/parity/bits) */ 567 baud = simple_strtoul(options, &options, 10); 568 if (baud != 0) { 569 kgdb_baud = baud; 570 571 c = toupper(*options); 572 if (c == 'E' || c == 'O' || c == 'N') { 573 kgdb_parity = c; 574 options++; 575 } 576 577 c = *options; 578 if (c == '7' || c == '8') { 579 kgdb_bits = c; 580 options++; 581 } 582 options = (*options == ',') ? options+1 : options; 583 } 584 } 585 586 /* Check for action specification */ 587 if (!memcmp(options, "halt", 4)) { 588 kgdb_halt = 1; 589 options += 4; 590 } else if (!memcmp(options, "disabled", 8)) { 591 kgdb_enabled = 0; 592 options += 8; 593 } 594 595 if (*options) { 596 KGDB_PRINTK("ignored unknown options: %s\n", options); 597 return 0; 598 } 599 return 1; 600 } 601 __setup("kgdb=", kgdb_parse_options); 602 #endif /* CONFIG_SH_KGDB */ 603