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 { 89 char c = ' ', *to = command_line, *from = COMMAND_LINE; 90 int len = 0; 91 92 /* Save unparsed command line copy for /proc/cmdline */ 93 memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 94 saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; 95 96 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START; 97 memory_end = memory_start + __MEMORY_SIZE; 98 99 for (;;) { 100 /* 101 * "mem=XXX[kKmM]" defines a size of memory. 102 */ 103 if (c == ' ' && !memcmp(from, "mem=", 4)) { 104 if (to != command_line) 105 to--; 106 { 107 unsigned long mem_size; 108 109 mem_size = memparse(from+4, &from); 110 memory_end = memory_start + mem_size; 111 } 112 } 113 114 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) { 115 char* mv_end; 116 char* mv_comma; 117 int mv_len; 118 if (to != command_line) 119 to--; 120 from += 6; 121 mv_end = strchr(from, ' '); 122 if (mv_end == NULL) 123 mv_end = from + strlen(from); 124 125 mv_comma = strchr(from, ','); 126 if ((mv_comma != NULL) && (mv_comma < mv_end)) { 127 int ints[3]; 128 get_options(mv_comma+1, ARRAY_SIZE(ints), ints); 129 *mv_io_base = ints[1]; 130 mv_len = mv_comma - from; 131 } else { 132 mv_len = mv_end - from; 133 } 134 if (mv_len > (MV_NAME_SIZE-1)) 135 mv_len = MV_NAME_SIZE-1; 136 memcpy(mv_name, from, mv_len); 137 mv_name[mv_len] = '\0'; 138 from = mv_end; 139 140 *mvp = get_mv_byname(mv_name); 141 } 142 143 c = *(from++); 144 if (!c) 145 break; 146 if (COMMAND_LINE_SIZE <= ++len) 147 break; 148 *(to++) = c; 149 } 150 *to = '\0'; 151 *cmdline_p = command_line; 152 } 153 154 static int __init sh_mv_setup(char **cmdline_p) 155 { 156 #ifdef CONFIG_SH_UNKNOWN 157 extern struct sh_machine_vector mv_unknown; 158 #endif 159 struct sh_machine_vector *mv = NULL; 160 char mv_name[MV_NAME_SIZE] = ""; 161 unsigned long mv_io_base = 0; 162 163 parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base); 164 165 #ifdef CONFIG_SH_UNKNOWN 166 if (mv == NULL) { 167 mv = &mv_unknown; 168 if (*mv_name != '\0') { 169 printk("Warning: Unsupported machine %s, using unknown\n", 170 mv_name); 171 } 172 } 173 sh_mv = *mv; 174 #endif 175 176 /* 177 * Manually walk the vec, fill in anything that the board hasn't yet 178 * by hand, wrapping to the generic implementation. 179 */ 180 #define mv_set(elem) do { \ 181 if (!sh_mv.mv_##elem) \ 182 sh_mv.mv_##elem = generic_##elem; \ 183 } while (0) 184 185 mv_set(inb); mv_set(inw); mv_set(inl); 186 mv_set(outb); mv_set(outw); mv_set(outl); 187 188 mv_set(inb_p); mv_set(inw_p); mv_set(inl_p); 189 mv_set(outb_p); mv_set(outw_p); mv_set(outl_p); 190 191 mv_set(insb); mv_set(insw); mv_set(insl); 192 mv_set(outsb); mv_set(outsw); mv_set(outsl); 193 194 mv_set(readb); mv_set(readw); mv_set(readl); 195 mv_set(writeb); mv_set(writew); mv_set(writel); 196 197 mv_set(ioport_map); 198 mv_set(ioport_unmap); 199 mv_set(irq_demux); 200 201 #ifdef CONFIG_SH_UNKNOWN 202 __set_io_port_base(mv_io_base); 203 #endif 204 205 if (!sh_mv.mv_nr_irqs) 206 sh_mv.mv_nr_irqs = NR_IRQS; 207 208 return 0; 209 } 210 211 void __init setup_arch(char **cmdline_p) 212 { 213 unsigned long bootmap_size; 214 unsigned long start_pfn, max_pfn, max_low_pfn; 215 216 #ifdef CONFIG_CMDLINE_BOOL 217 strcpy(COMMAND_LINE, CONFIG_CMDLINE); 218 #endif 219 220 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 221 222 #ifdef CONFIG_BLK_DEV_RAM 223 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 224 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 225 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 226 #endif 227 228 if (!MOUNT_ROOT_RDONLY) 229 root_mountflags &= ~MS_RDONLY; 230 init_mm.start_code = (unsigned long) _text; 231 init_mm.end_code = (unsigned long) _etext; 232 init_mm.end_data = (unsigned long) _edata; 233 init_mm.brk = (unsigned long) _end; 234 235 code_resource.start = (unsigned long)virt_to_phys(_text); 236 code_resource.end = (unsigned long)virt_to_phys(_etext)-1; 237 data_resource.start = (unsigned long)virt_to_phys(_etext); 238 data_resource.end = (unsigned long)virt_to_phys(_edata)-1; 239 240 sh_mv_setup(cmdline_p); 241 242 243 /* 244 * Find the highest page frame number we have available 245 */ 246 max_pfn = PFN_DOWN(__pa(memory_end)); 247 248 /* 249 * Determine low and high memory ranges: 250 */ 251 max_low_pfn = max_pfn; 252 253 /* 254 * Partially used pages are not usable - thus 255 * we are rounding upwards: 256 */ 257 start_pfn = PFN_UP(__pa(_end)); 258 259 /* 260 * Find a proper area for the bootmem bitmap. After this 261 * bootstrap step all allocations (until the page allocator 262 * is intact) must be done via bootmem_alloc(). 263 */ 264 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn, 265 __MEMORY_START>>PAGE_SHIFT, 266 max_low_pfn); 267 /* 268 * Register fully available low RAM pages with the bootmem allocator. 269 */ 270 { 271 unsigned long curr_pfn, last_pfn, pages; 272 273 /* 274 * We are rounding up the start address of usable memory: 275 */ 276 curr_pfn = PFN_UP(__MEMORY_START); 277 /* 278 * ... and at the end of the usable range downwards: 279 */ 280 last_pfn = PFN_DOWN(__pa(memory_end)); 281 282 if (last_pfn > max_low_pfn) 283 last_pfn = max_low_pfn; 284 285 pages = last_pfn - curr_pfn; 286 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn), 287 PFN_PHYS(pages)); 288 } 289 290 291 /* 292 * Reserve the kernel text and 293 * Reserve the bootmem bitmap. We do this in two steps (first step 294 * was init_bootmem()), because this catches the (definitely buggy) 295 * case of us accidentally initializing the bootmem allocator with 296 * an invalid RAM area. 297 */ 298 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE, 299 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START); 300 301 /* 302 * reserve physical page 0 - it's a special BIOS page on many boxes, 303 * enabling clean reboots, SMP operation, laptop functions. 304 */ 305 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE); 306 307 #ifdef CONFIG_BLK_DEV_INITRD 308 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); 309 if (&__rd_start != &__rd_end) { 310 LOADER_TYPE = 1; 311 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - 312 __MEMORY_START; 313 INITRD_SIZE = (unsigned long)&__rd_end - 314 (unsigned long)&__rd_start; 315 } 316 317 if (LOADER_TYPE && INITRD_START) { 318 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { 319 reserve_bootmem_node(NODE_DATA(0), INITRD_START + 320 __MEMORY_START, INITRD_SIZE); 321 initrd_start = INITRD_START + PAGE_OFFSET + 322 __MEMORY_START; 323 initrd_end = initrd_start + INITRD_SIZE; 324 } else { 325 printk("initrd extends beyond end of memory " 326 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 327 INITRD_START + INITRD_SIZE, 328 max_low_pfn << PAGE_SHIFT); 329 initrd_start = 0; 330 } 331 } 332 #endif 333 334 #ifdef CONFIG_DUMMY_CONSOLE 335 conswitchp = &dummy_con; 336 #endif 337 338 /* Perform the machine specific initialisation */ 339 if (likely(sh_mv.mv_setup)) 340 sh_mv.mv_setup(cmdline_p); 341 342 paging_init(); 343 } 344 345 struct sh_machine_vector* __init get_mv_byname(const char* name) 346 { 347 extern long __machvec_start, __machvec_end; 348 struct sh_machine_vector *all_vecs = 349 (struct sh_machine_vector *)&__machvec_start; 350 351 int i, n = ((unsigned long)&__machvec_end 352 - (unsigned long)&__machvec_start)/ 353 sizeof(struct sh_machine_vector); 354 355 for (i = 0; i < n; ++i) { 356 struct sh_machine_vector *mv = &all_vecs[i]; 357 if (mv == NULL) 358 continue; 359 if (strcasecmp(name, get_system_type()) == 0) { 360 return mv; 361 } 362 } 363 return NULL; 364 } 365 366 static struct cpu cpu[NR_CPUS]; 367 368 static int __init topology_init(void) 369 { 370 int cpu_id; 371 372 for_each_possible_cpu(cpu_id) 373 register_cpu(&cpu[cpu_id], cpu_id); 374 375 return 0; 376 } 377 378 subsys_initcall(topology_init); 379 380 static const char *cpu_name[] = { 381 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619", 382 [CPU_SH7604] = "SH7604", [CPU_SH7300] = "SH7300", 383 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706", 384 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708", 385 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710", 386 [CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750", 387 [CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R", 388 [CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R", 389 [CPU_SH7760] = "SH7760", [CPU_SH73180] = "SH73180", 390 [CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1", 391 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501", 392 [CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780", 393 [CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343", 394 [CPU_SH7785] = "SH7785", [CPU_SH7722] = "SH7722", 395 [CPU_SH_NONE] = "Unknown" 396 }; 397 398 const char *get_cpu_subtype(void) 399 { 400 return cpu_name[boot_cpu_data.type]; 401 } 402 403 #ifdef CONFIG_PROC_FS 404 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */ 405 static const char *cpu_flags[] = { 406 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", 407 "ptea", "llsc", "l2", NULL 408 }; 409 410 static void show_cpuflags(struct seq_file *m) 411 { 412 unsigned long i; 413 414 seq_printf(m, "cpu flags\t:"); 415 416 if (!cpu_data->flags) { 417 seq_printf(m, " %s\n", cpu_flags[0]); 418 return; 419 } 420 421 for (i = 0; cpu_flags[i]; i++) 422 if ((cpu_data->flags & (1 << i))) 423 seq_printf(m, " %s", cpu_flags[i+1]); 424 425 seq_printf(m, "\n"); 426 } 427 428 static void show_cacheinfo(struct seq_file *m, const char *type, 429 struct cache_info info) 430 { 431 unsigned int cache_size; 432 433 cache_size = info.ways * info.sets * info.linesz; 434 435 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n", 436 type, cache_size >> 10, info.ways); 437 } 438 439 /* 440 * Get CPU information for use by the procfs. 441 */ 442 static int show_cpuinfo(struct seq_file *m, void *v) 443 { 444 unsigned int cpu = smp_processor_id(); 445 446 if (!cpu && cpu_online(cpu)) 447 seq_printf(m, "machine\t\t: %s\n", get_system_type()); 448 449 seq_printf(m, "processor\t: %d\n", cpu); 450 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine); 451 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype()); 452 453 show_cpuflags(m); 454 455 seq_printf(m, "cache type\t: "); 456 457 /* 458 * Check for what type of cache we have, we support both the 459 * unified cache on the SH-2 and SH-3, as well as the harvard 460 * style cache on the SH-4. 461 */ 462 if (boot_cpu_data.icache.flags & SH_CACHE_COMBINED) { 463 seq_printf(m, "unified\n"); 464 show_cacheinfo(m, "cache", boot_cpu_data.icache); 465 } else { 466 seq_printf(m, "split (harvard)\n"); 467 show_cacheinfo(m, "icache", boot_cpu_data.icache); 468 show_cacheinfo(m, "dcache", boot_cpu_data.dcache); 469 } 470 471 /* Optional secondary cache */ 472 if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) 473 show_cacheinfo(m, "scache", boot_cpu_data.scache); 474 475 seq_printf(m, "bogomips\t: %lu.%02lu\n", 476 boot_cpu_data.loops_per_jiffy/(500000/HZ), 477 (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100); 478 479 return show_clocks(m); 480 } 481 482 static void *c_start(struct seq_file *m, loff_t *pos) 483 { 484 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 485 } 486 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 487 { 488 ++*pos; 489 return c_start(m, pos); 490 } 491 static void c_stop(struct seq_file *m, void *v) 492 { 493 } 494 struct seq_operations cpuinfo_op = { 495 .start = c_start, 496 .next = c_next, 497 .stop = c_stop, 498 .show = show_cpuinfo, 499 }; 500 #endif /* CONFIG_PROC_FS */ 501 502 #ifdef CONFIG_SH_KGDB 503 /* 504 * Parse command-line kgdb options. By default KGDB is enabled, 505 * entered on error (or other action) using default serial info. 506 * The command-line option can include a serial port specification 507 * and an action to override default or configured behavior. 508 */ 509 struct kgdb_sermap kgdb_sci_sermap = 510 { "ttySC", 5, kgdb_sci_setup, NULL }; 511 512 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap; 513 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap; 514 515 void kgdb_register_sermap(struct kgdb_sermap *map) 516 { 517 struct kgdb_sermap *last; 518 519 for (last = kgdb_serlist; last->next; last = last->next) 520 ; 521 last->next = map; 522 if (!map->namelen) { 523 map->namelen = strlen(map->name); 524 } 525 } 526 527 static int __init kgdb_parse_options(char *options) 528 { 529 char c; 530 int baud; 531 532 /* Check for port spec (or use default) */ 533 534 /* Determine port type and instance */ 535 if (!memcmp(options, "tty", 3)) { 536 struct kgdb_sermap *map = kgdb_serlist; 537 538 while (map && memcmp(options, map->name, map->namelen)) 539 map = map->next; 540 541 if (!map) { 542 KGDB_PRINTK("unknown port spec in %s\n", options); 543 return -1; 544 } 545 546 kgdb_porttype = map; 547 kgdb_serial_setup = map->setup_fn; 548 kgdb_portnum = options[map->namelen] - '0'; 549 options += map->namelen + 1; 550 551 options = (*options == ',') ? options+1 : options; 552 553 /* Read optional parameters (baud/parity/bits) */ 554 baud = simple_strtoul(options, &options, 10); 555 if (baud != 0) { 556 kgdb_baud = baud; 557 558 c = toupper(*options); 559 if (c == 'E' || c == 'O' || c == 'N') { 560 kgdb_parity = c; 561 options++; 562 } 563 564 c = *options; 565 if (c == '7' || c == '8') { 566 kgdb_bits = c; 567 options++; 568 } 569 options = (*options == ',') ? options+1 : options; 570 } 571 } 572 573 /* Check for action specification */ 574 if (!memcmp(options, "halt", 4)) { 575 kgdb_halt = 1; 576 options += 4; 577 } else if (!memcmp(options, "disabled", 8)) { 578 kgdb_enabled = 0; 579 options += 8; 580 } 581 582 if (*options) { 583 KGDB_PRINTK("ignored unknown options: %s\n", options); 584 return 0; 585 } 586 return 1; 587 } 588 __setup("kgdb=", kgdb_parse_options); 589 #endif /* CONFIG_SH_KGDB */ 590