1 /* 2 * arch/sh/kernel/setup.c 3 * 4 * This file handles the architecture-dependent parts of initialization 5 * 6 * Copyright (C) 1999 Niibe Yutaka 7 * Copyright (C) 2002 - 2006 Paul Mundt 8 */ 9 #include <linux/screen_info.h> 10 #include <linux/ioport.h> 11 #include <linux/init.h> 12 #include <linux/initrd.h> 13 #include <linux/bootmem.h> 14 #include <linux/console.h> 15 #include <linux/seq_file.h> 16 #include <linux/root_dev.h> 17 #include <linux/utsname.h> 18 #include <linux/cpu.h> 19 #include <linux/pfn.h> 20 #include <linux/fs.h> 21 #include <asm/uaccess.h> 22 #include <asm/io.h> 23 #include <asm/sections.h> 24 #include <asm/irq.h> 25 #include <asm/setup.h> 26 #include <asm/clock.h> 27 28 #ifdef CONFIG_SH_KGDB 29 #include <asm/kgdb.h> 30 static int kgdb_parse_options(char *options); 31 #endif 32 extern void * __rd_start, * __rd_end; 33 /* 34 * Machine setup.. 35 */ 36 37 /* 38 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 39 * This value will be used at the very early stage of serial setup. 40 * The bigger value means no problem. 41 */ 42 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, }; 43 #ifdef CONFIG_VT 44 struct screen_info screen_info; 45 #endif 46 47 #if defined(CONFIG_SH_UNKNOWN) 48 struct sh_machine_vector sh_mv; 49 #endif 50 51 extern int root_mountflags; 52 53 #define MV_NAME_SIZE 32 54 55 static struct sh_machine_vector* __init get_mv_byname(const char* name); 56 57 /* 58 * This is set up by the setup-routine at boot-time 59 */ 60 #define PARAM ((unsigned char *)empty_zero_page) 61 62 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000)) 63 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004)) 64 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008)) 65 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c)) 66 #define INITRD_START (*(unsigned long *) (PARAM+0x010)) 67 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014)) 68 /* ... */ 69 #define COMMAND_LINE ((char *) (PARAM+0x100)) 70 71 #define RAMDISK_IMAGE_START_MASK 0x07FF 72 #define RAMDISK_PROMPT_FLAG 0x8000 73 #define RAMDISK_LOAD_FLAG 0x4000 74 75 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; 76 77 static struct resource code_resource = { .name = "Kernel code", }; 78 static struct resource data_resource = { .name = "Kernel data", }; 79 80 unsigned long memory_start, memory_end; 81 82 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE], 83 struct sh_machine_vector** mvp, 84 unsigned long *mv_io_base) 85 { 86 char c = ' ', *to = command_line, *from = COMMAND_LINE; 87 int len = 0; 88 89 /* Save unparsed command line copy for /proc/cmdline */ 90 memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 91 boot_command_line[COMMAND_LINE_SIZE-1] = '\0'; 92 93 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START; 94 memory_end = memory_start + __MEMORY_SIZE; 95 96 for (;;) { 97 /* 98 * "mem=XXX[kKmM]" defines a size of memory. 99 */ 100 if (c == ' ' && !memcmp(from, "mem=", 4)) { 101 if (to != command_line) 102 to--; 103 { 104 unsigned long mem_size; 105 106 mem_size = memparse(from+4, &from); 107 memory_end = memory_start + mem_size; 108 } 109 } 110 111 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) { 112 char* mv_end; 113 char* mv_comma; 114 int mv_len; 115 if (to != command_line) 116 to--; 117 from += 6; 118 mv_end = strchr(from, ' '); 119 if (mv_end == NULL) 120 mv_end = from + strlen(from); 121 122 mv_comma = strchr(from, ','); 123 if ((mv_comma != NULL) && (mv_comma < mv_end)) { 124 int ints[3]; 125 get_options(mv_comma+1, ARRAY_SIZE(ints), ints); 126 *mv_io_base = ints[1]; 127 mv_len = mv_comma - from; 128 } else { 129 mv_len = mv_end - from; 130 } 131 if (mv_len > (MV_NAME_SIZE-1)) 132 mv_len = MV_NAME_SIZE-1; 133 memcpy(mv_name, from, mv_len); 134 mv_name[mv_len] = '\0'; 135 from = mv_end; 136 137 *mvp = get_mv_byname(mv_name); 138 } 139 140 c = *(from++); 141 if (!c) 142 break; 143 if (COMMAND_LINE_SIZE <= ++len) 144 break; 145 *(to++) = c; 146 } 147 *to = '\0'; 148 *cmdline_p = command_line; 149 } 150 151 static int __init sh_mv_setup(char **cmdline_p) 152 { 153 #ifdef CONFIG_SH_UNKNOWN 154 extern struct sh_machine_vector mv_unknown; 155 #endif 156 struct sh_machine_vector *mv = NULL; 157 char mv_name[MV_NAME_SIZE] = ""; 158 unsigned long mv_io_base = 0; 159 160 parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base); 161 162 #ifdef CONFIG_SH_UNKNOWN 163 if (mv == NULL) { 164 mv = &mv_unknown; 165 if (*mv_name != '\0') { 166 printk("Warning: Unsupported machine %s, using unknown\n", 167 mv_name); 168 } 169 } 170 sh_mv = *mv; 171 #endif 172 173 /* 174 * Manually walk the vec, fill in anything that the board hasn't yet 175 * by hand, wrapping to the generic implementation. 176 */ 177 #define mv_set(elem) do { \ 178 if (!sh_mv.mv_##elem) \ 179 sh_mv.mv_##elem = generic_##elem; \ 180 } while (0) 181 182 mv_set(inb); mv_set(inw); mv_set(inl); 183 mv_set(outb); mv_set(outw); mv_set(outl); 184 185 mv_set(inb_p); mv_set(inw_p); mv_set(inl_p); 186 mv_set(outb_p); mv_set(outw_p); mv_set(outl_p); 187 188 mv_set(insb); mv_set(insw); mv_set(insl); 189 mv_set(outsb); mv_set(outsw); mv_set(outsl); 190 191 mv_set(readb); mv_set(readw); mv_set(readl); 192 mv_set(writeb); mv_set(writew); mv_set(writel); 193 194 mv_set(ioport_map); 195 mv_set(ioport_unmap); 196 mv_set(irq_demux); 197 198 #ifdef CONFIG_SH_UNKNOWN 199 __set_io_port_base(mv_io_base); 200 #endif 201 202 if (!sh_mv.mv_nr_irqs) 203 sh_mv.mv_nr_irqs = NR_IRQS; 204 205 return 0; 206 } 207 208 void __init setup_arch(char **cmdline_p) 209 { 210 unsigned long bootmap_size; 211 unsigned long start_pfn, max_pfn, max_low_pfn; 212 213 #ifdef CONFIG_CMDLINE_BOOL 214 strcpy(COMMAND_LINE, CONFIG_CMDLINE); 215 #endif 216 217 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 218 219 #ifdef CONFIG_BLK_DEV_RAM 220 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 221 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 222 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 223 #endif 224 225 if (!MOUNT_ROOT_RDONLY) 226 root_mountflags &= ~MS_RDONLY; 227 init_mm.start_code = (unsigned long) _text; 228 init_mm.end_code = (unsigned long) _etext; 229 init_mm.end_data = (unsigned long) _edata; 230 init_mm.brk = (unsigned long) _end; 231 232 code_resource.start = (unsigned long)virt_to_phys(_text); 233 code_resource.end = (unsigned long)virt_to_phys(_etext)-1; 234 data_resource.start = (unsigned long)virt_to_phys(_etext); 235 data_resource.end = (unsigned long)virt_to_phys(_edata)-1; 236 237 sh_mv_setup(cmdline_p); 238 239 240 /* 241 * Find the highest page frame number we have available 242 */ 243 max_pfn = PFN_DOWN(__pa(memory_end)); 244 245 /* 246 * Determine low and high memory ranges: 247 */ 248 max_low_pfn = max_pfn; 249 250 /* 251 * Partially used pages are not usable - thus 252 * we are rounding upwards: 253 */ 254 start_pfn = PFN_UP(__pa(_end)); 255 256 /* 257 * Find a proper area for the bootmem bitmap. After this 258 * bootstrap step all allocations (until the page allocator 259 * is intact) must be done via bootmem_alloc(). 260 */ 261 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn, 262 __MEMORY_START>>PAGE_SHIFT, 263 max_low_pfn); 264 /* 265 * Register fully available low RAM pages with the bootmem allocator. 266 */ 267 { 268 unsigned long curr_pfn, last_pfn, pages; 269 270 /* 271 * We are rounding up the start address of usable memory: 272 */ 273 curr_pfn = PFN_UP(__MEMORY_START); 274 /* 275 * ... and at the end of the usable range downwards: 276 */ 277 last_pfn = PFN_DOWN(__pa(memory_end)); 278 279 if (last_pfn > max_low_pfn) 280 last_pfn = max_low_pfn; 281 282 pages = last_pfn - curr_pfn; 283 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn), 284 PFN_PHYS(pages)); 285 } 286 287 288 /* 289 * Reserve the kernel text and 290 * Reserve the bootmem bitmap. We do this in two steps (first step 291 * was init_bootmem()), because this catches the (definitely buggy) 292 * case of us accidentally initializing the bootmem allocator with 293 * an invalid RAM area. 294 */ 295 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE, 296 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START); 297 298 /* 299 * reserve physical page 0 - it's a special BIOS page on many boxes, 300 * enabling clean reboots, SMP operation, laptop functions. 301 */ 302 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE); 303 304 #ifdef CONFIG_BLK_DEV_INITRD 305 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); 306 if (&__rd_start != &__rd_end) { 307 LOADER_TYPE = 1; 308 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - 309 __MEMORY_START; 310 INITRD_SIZE = (unsigned long)&__rd_end - 311 (unsigned long)&__rd_start; 312 } 313 314 if (LOADER_TYPE && INITRD_START) { 315 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { 316 reserve_bootmem_node(NODE_DATA(0), INITRD_START + 317 __MEMORY_START, INITRD_SIZE); 318 initrd_start = INITRD_START + PAGE_OFFSET + 319 __MEMORY_START; 320 initrd_end = initrd_start + INITRD_SIZE; 321 } else { 322 printk("initrd extends beyond end of memory " 323 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 324 INITRD_START + INITRD_SIZE, 325 max_low_pfn << PAGE_SHIFT); 326 initrd_start = 0; 327 } 328 } 329 #endif 330 331 #ifdef CONFIG_DUMMY_CONSOLE 332 conswitchp = &dummy_con; 333 #endif 334 335 /* Perform the machine specific initialisation */ 336 if (likely(sh_mv.mv_setup)) 337 sh_mv.mv_setup(cmdline_p); 338 339 paging_init(); 340 } 341 342 struct sh_machine_vector* __init get_mv_byname(const char* name) 343 { 344 extern long __machvec_start, __machvec_end; 345 struct sh_machine_vector *all_vecs = 346 (struct sh_machine_vector *)&__machvec_start; 347 348 int i, n = ((unsigned long)&__machvec_end 349 - (unsigned long)&__machvec_start)/ 350 sizeof(struct sh_machine_vector); 351 352 for (i = 0; i < n; ++i) { 353 struct sh_machine_vector *mv = &all_vecs[i]; 354 if (mv == NULL) 355 continue; 356 if (strcasecmp(name, get_system_type()) == 0) { 357 return mv; 358 } 359 } 360 return NULL; 361 } 362 363 static struct cpu cpu[NR_CPUS]; 364 365 static int __init topology_init(void) 366 { 367 int cpu_id; 368 369 for_each_possible_cpu(cpu_id) 370 register_cpu(&cpu[cpu_id], cpu_id); 371 372 return 0; 373 } 374 375 subsys_initcall(topology_init); 376 377 static const char *cpu_name[] = { 378 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619", 379 [CPU_SH7604] = "SH7604", [CPU_SH7300] = "SH7300", 380 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706", 381 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708", 382 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710", 383 [CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750", 384 [CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R", 385 [CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R", 386 [CPU_SH7760] = "SH7760", [CPU_SH73180] = "SH73180", 387 [CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1", 388 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501", 389 [CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780", 390 [CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343", 391 [CPU_SH7785] = "SH7785", [CPU_SH7722] = "SH7722", 392 [CPU_SH_NONE] = "Unknown" 393 }; 394 395 const char *get_cpu_subtype(struct sh_cpuinfo *c) 396 { 397 return cpu_name[c->type]; 398 } 399 400 #ifdef CONFIG_PROC_FS 401 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */ 402 static const char *cpu_flags[] = { 403 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", 404 "ptea", "llsc", "l2", NULL 405 }; 406 407 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c) 408 { 409 unsigned long i; 410 411 seq_printf(m, "cpu flags\t:"); 412 413 if (!c->flags) { 414 seq_printf(m, " %s\n", cpu_flags[0]); 415 return; 416 } 417 418 for (i = 0; cpu_flags[i]; i++) 419 if ((c->flags & (1 << i))) 420 seq_printf(m, " %s", cpu_flags[i+1]); 421 422 seq_printf(m, "\n"); 423 } 424 425 static void show_cacheinfo(struct seq_file *m, const char *type, 426 struct cache_info info) 427 { 428 unsigned int cache_size; 429 430 cache_size = info.ways * info.sets * info.linesz; 431 432 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n", 433 type, cache_size >> 10, info.ways); 434 } 435 436 /* 437 * Get CPU information for use by the procfs. 438 */ 439 static int show_cpuinfo(struct seq_file *m, void *v) 440 { 441 struct sh_cpuinfo *c = v; 442 unsigned int cpu = c - cpu_data; 443 444 if (!cpu_online(cpu)) 445 return 0; 446 447 if (cpu == 0) 448 seq_printf(m, "machine\t\t: %s\n", get_system_type()); 449 450 seq_printf(m, "processor\t: %d\n", cpu); 451 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine); 452 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c)); 453 454 show_cpuflags(m, c); 455 456 seq_printf(m, "cache type\t: "); 457 458 /* 459 * Check for what type of cache we have, we support both the 460 * unified cache on the SH-2 and SH-3, as well as the harvard 461 * style cache on the SH-4. 462 */ 463 if (c->icache.flags & SH_CACHE_COMBINED) { 464 seq_printf(m, "unified\n"); 465 show_cacheinfo(m, "cache", c->icache); 466 } else { 467 seq_printf(m, "split (harvard)\n"); 468 show_cacheinfo(m, "icache", c->icache); 469 show_cacheinfo(m, "dcache", c->dcache); 470 } 471 472 /* Optional secondary cache */ 473 if (c->flags & CPU_HAS_L2_CACHE) 474 show_cacheinfo(m, "scache", c->scache); 475 476 seq_printf(m, "bogomips\t: %lu.%02lu\n", 477 c->loops_per_jiffy/(500000/HZ), 478 (c->loops_per_jiffy/(5000/HZ)) % 100); 479 480 return show_clocks(m); 481 } 482 483 static void *c_start(struct seq_file *m, loff_t *pos) 484 { 485 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 486 } 487 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 488 { 489 ++*pos; 490 return c_start(m, pos); 491 } 492 static void c_stop(struct seq_file *m, void *v) 493 { 494 } 495 struct seq_operations cpuinfo_op = { 496 .start = c_start, 497 .next = c_next, 498 .stop = c_stop, 499 .show = show_cpuinfo, 500 }; 501 #endif /* CONFIG_PROC_FS */ 502 503 #ifdef CONFIG_SH_KGDB 504 /* 505 * Parse command-line kgdb options. By default KGDB is enabled, 506 * entered on error (or other action) using default serial info. 507 * The command-line option can include a serial port specification 508 * and an action to override default or configured behavior. 509 */ 510 struct kgdb_sermap kgdb_sci_sermap = 511 { "ttySC", 5, kgdb_sci_setup, NULL }; 512 513 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap; 514 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap; 515 516 void kgdb_register_sermap(struct kgdb_sermap *map) 517 { 518 struct kgdb_sermap *last; 519 520 for (last = kgdb_serlist; last->next; last = last->next) 521 ; 522 last->next = map; 523 if (!map->namelen) { 524 map->namelen = strlen(map->name); 525 } 526 } 527 528 static int __init kgdb_parse_options(char *options) 529 { 530 char c; 531 int baud; 532 533 /* Check for port spec (or use default) */ 534 535 /* Determine port type and instance */ 536 if (!memcmp(options, "tty", 3)) { 537 struct kgdb_sermap *map = kgdb_serlist; 538 539 while (map && memcmp(options, map->name, map->namelen)) 540 map = map->next; 541 542 if (!map) { 543 KGDB_PRINTK("unknown port spec in %s\n", options); 544 return -1; 545 } 546 547 kgdb_porttype = map; 548 kgdb_serial_setup = map->setup_fn; 549 kgdb_portnum = options[map->namelen] - '0'; 550 options += map->namelen + 1; 551 552 options = (*options == ',') ? options+1 : options; 553 554 /* Read optional parameters (baud/parity/bits) */ 555 baud = simple_strtoul(options, &options, 10); 556 if (baud != 0) { 557 kgdb_baud = baud; 558 559 c = toupper(*options); 560 if (c == 'E' || c == 'O' || c == 'N') { 561 kgdb_parity = c; 562 options++; 563 } 564 565 c = *options; 566 if (c == '7' || c == '8') { 567 kgdb_bits = c; 568 options++; 569 } 570 options = (*options == ',') ? options+1 : options; 571 } 572 } 573 574 /* Check for action specification */ 575 if (!memcmp(options, "halt", 4)) { 576 kgdb_halt = 1; 577 options += 4; 578 } else if (!memcmp(options, "disabled", 8)) { 579 kgdb_enabled = 0; 580 options += 8; 581 } 582 583 if (*options) { 584 KGDB_PRINTK("ignored unknown options: %s\n", options); 585 return 0; 586 } 587 return 1; 588 } 589 __setup("kgdb=", kgdb_parse_options); 590 #endif /* CONFIG_SH_KGDB */ 591