1 /* $Id: setup.c,v 1.30 2003/10/13 07:21:19 lethal Exp $ 2 * 3 * linux/arch/sh/kernel/setup.c 4 * 5 * Copyright (C) 1999 Niibe Yutaka 6 * Copyright (C) 2002, 2003 Paul Mundt 7 */ 8 9 /* 10 * This file handles the architecture-dependent parts of initialization 11 */ 12 13 #include <linux/tty.h> 14 #include <linux/ioport.h> 15 #include <linux/init.h> 16 #include <linux/initrd.h> 17 #include <linux/bootmem.h> 18 #include <linux/console.h> 19 #include <linux/seq_file.h> 20 #include <linux/root_dev.h> 21 #include <linux/utsname.h> 22 #include <linux/cpu.h> 23 #include <linux/pfn.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 struct screen_info screen_info; 47 48 #if defined(CONFIG_SH_UNKNOWN) 49 struct sh_machine_vector sh_mv; 50 #endif 51 52 /* We need this to satisfy some external references. */ 53 struct screen_info screen_info = { 54 0, 25, /* orig-x, orig-y */ 55 0, /* unused */ 56 0, /* orig-video-page */ 57 0, /* orig-video-mode */ 58 80, /* orig-video-cols */ 59 0,0,0, /* ega_ax, ega_bx, ega_cx */ 60 25, /* orig-video-lines */ 61 0, /* orig-video-isVGA */ 62 16 /* orig-video-points */ 63 }; 64 65 extern void platform_setup(void); 66 extern char *get_system_type(void); 67 extern int root_mountflags; 68 69 #define MV_NAME_SIZE 32 70 71 static struct sh_machine_vector* __init get_mv_byname(const char* name); 72 73 /* 74 * This is set up by the setup-routine at boot-time 75 */ 76 #define PARAM ((unsigned char *)empty_zero_page) 77 78 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000)) 79 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004)) 80 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008)) 81 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c)) 82 #define INITRD_START (*(unsigned long *) (PARAM+0x010)) 83 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014)) 84 /* ... */ 85 #define COMMAND_LINE ((char *) (PARAM+0x100)) 86 87 #define RAMDISK_IMAGE_START_MASK 0x07FF 88 #define RAMDISK_PROMPT_FLAG 0x8000 89 #define RAMDISK_LOAD_FLAG 0x4000 90 91 static char command_line[COMMAND_LINE_SIZE] = { 0, }; 92 93 struct resource standard_io_resources[] = { 94 { "dma1", 0x00, 0x1f }, 95 { "pic1", 0x20, 0x3f }, 96 { "timer", 0x40, 0x5f }, 97 { "keyboard", 0x60, 0x6f }, 98 { "dma page reg", 0x80, 0x8f }, 99 { "pic2", 0xa0, 0xbf }, 100 { "dma2", 0xc0, 0xdf }, 101 { "fpu", 0xf0, 0xff } 102 }; 103 104 #define STANDARD_IO_RESOURCES (sizeof(standard_io_resources)/sizeof(struct resource)) 105 106 /* System RAM - interrupted by the 640kB-1M hole */ 107 #define code_resource (ram_resources[3]) 108 #define data_resource (ram_resources[4]) 109 static struct resource ram_resources[] = { 110 { "System RAM", 0x000000, 0x09ffff, IORESOURCE_BUSY }, 111 { "System RAM", 0x100000, 0x100000, IORESOURCE_BUSY }, 112 { "Video RAM area", 0x0a0000, 0x0bffff }, 113 { "Kernel code", 0x100000, 0 }, 114 { "Kernel data", 0, 0 } 115 }; 116 117 unsigned long memory_start, memory_end; 118 119 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE], 120 struct sh_machine_vector** mvp, 121 unsigned long *mv_io_base, 122 int *mv_mmio_enable) 123 { 124 char c = ' ', *to = command_line, *from = COMMAND_LINE; 125 int len = 0; 126 127 /* Save unparsed command line copy for /proc/cmdline */ 128 memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 129 saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; 130 131 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START; 132 memory_end = memory_start + __MEMORY_SIZE; 133 134 for (;;) { 135 /* 136 * "mem=XXX[kKmM]" defines a size of memory. 137 */ 138 if (c == ' ' && !memcmp(from, "mem=", 4)) { 139 if (to != command_line) 140 to--; 141 { 142 unsigned long mem_size; 143 144 mem_size = memparse(from+4, &from); 145 memory_end = memory_start + mem_size; 146 } 147 } 148 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) { 149 char* mv_end; 150 char* mv_comma; 151 int mv_len; 152 if (to != command_line) 153 to--; 154 from += 6; 155 mv_end = strchr(from, ' '); 156 if (mv_end == NULL) 157 mv_end = from + strlen(from); 158 159 mv_comma = strchr(from, ','); 160 if ((mv_comma != NULL) && (mv_comma < mv_end)) { 161 int ints[3]; 162 get_options(mv_comma+1, ARRAY_SIZE(ints), ints); 163 *mv_io_base = ints[1]; 164 *mv_mmio_enable = ints[2]; 165 mv_len = mv_comma - from; 166 } else { 167 mv_len = mv_end - from; 168 } 169 if (mv_len > (MV_NAME_SIZE-1)) 170 mv_len = MV_NAME_SIZE-1; 171 memcpy(mv_name, from, mv_len); 172 mv_name[mv_len] = '\0'; 173 from = mv_end; 174 175 *mvp = get_mv_byname(mv_name); 176 } 177 c = *(from++); 178 if (!c) 179 break; 180 if (COMMAND_LINE_SIZE <= ++len) 181 break; 182 *(to++) = c; 183 } 184 *to = '\0'; 185 *cmdline_p = command_line; 186 } 187 188 static int __init sh_mv_setup(char **cmdline_p) 189 { 190 #ifdef CONFIG_SH_UNKNOWN 191 extern struct sh_machine_vector mv_unknown; 192 #endif 193 struct sh_machine_vector *mv = NULL; 194 char mv_name[MV_NAME_SIZE] = ""; 195 unsigned long mv_io_base = 0; 196 int mv_mmio_enable = 0; 197 198 parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable); 199 200 #ifdef CONFIG_SH_UNKNOWN 201 if (mv == NULL) { 202 mv = &mv_unknown; 203 if (*mv_name != '\0') { 204 printk("Warning: Unsupported machine %s, using unknown\n", 205 mv_name); 206 } 207 } 208 sh_mv = *mv; 209 #endif 210 211 /* 212 * Manually walk the vec, fill in anything that the board hasn't yet 213 * by hand, wrapping to the generic implementation. 214 */ 215 #define mv_set(elem) do { \ 216 if (!sh_mv.mv_##elem) \ 217 sh_mv.mv_##elem = generic_##elem; \ 218 } while (0) 219 220 mv_set(inb); mv_set(inw); mv_set(inl); 221 mv_set(outb); mv_set(outw); mv_set(outl); 222 223 mv_set(inb_p); mv_set(inw_p); mv_set(inl_p); 224 mv_set(outb_p); mv_set(outw_p); mv_set(outl_p); 225 226 mv_set(insb); mv_set(insw); mv_set(insl); 227 mv_set(outsb); mv_set(outsw); mv_set(outsl); 228 229 mv_set(readb); mv_set(readw); mv_set(readl); 230 mv_set(writeb); mv_set(writew); mv_set(writel); 231 232 mv_set(ioport_map); 233 mv_set(ioport_unmap); 234 mv_set(irq_demux); 235 236 #ifdef CONFIG_SH_UNKNOWN 237 __set_io_port_base(mv_io_base); 238 #endif 239 240 return 0; 241 } 242 243 void __init setup_arch(char **cmdline_p) 244 { 245 unsigned long bootmap_size; 246 unsigned long start_pfn, max_pfn, max_low_pfn; 247 248 #ifdef CONFIG_EARLY_PRINTK 249 extern void enable_early_printk(void); 250 251 enable_early_printk(); 252 #endif 253 #ifdef CONFIG_CMDLINE_BOOL 254 strcpy(COMMAND_LINE, CONFIG_CMDLINE); 255 #endif 256 257 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 258 259 #ifdef CONFIG_BLK_DEV_RAM 260 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 261 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 262 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 263 #endif 264 265 if (!MOUNT_ROOT_RDONLY) 266 root_mountflags &= ~MS_RDONLY; 267 init_mm.start_code = (unsigned long) _text; 268 init_mm.end_code = (unsigned long) _etext; 269 init_mm.end_data = (unsigned long) _edata; 270 init_mm.brk = (unsigned long) _end; 271 272 code_resource.start = (unsigned long)virt_to_phys(_text); 273 code_resource.end = (unsigned long)virt_to_phys(_etext)-1; 274 data_resource.start = (unsigned long)virt_to_phys(_etext); 275 data_resource.end = (unsigned long)virt_to_phys(_edata)-1; 276 277 sh_mv_setup(cmdline_p); 278 279 /* 280 * Find the highest page frame number we have available 281 */ 282 max_pfn = PFN_DOWN(__pa(memory_end)); 283 284 /* 285 * Determine low and high memory ranges: 286 */ 287 max_low_pfn = max_pfn; 288 289 /* 290 * Partially used pages are not usable - thus 291 * we are rounding upwards: 292 */ 293 start_pfn = PFN_UP(__pa(_end)); 294 295 /* 296 * Find a proper area for the bootmem bitmap. After this 297 * bootstrap step all allocations (until the page allocator 298 * is intact) must be done via bootmem_alloc(). 299 */ 300 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn, 301 __MEMORY_START>>PAGE_SHIFT, 302 max_low_pfn); 303 /* 304 * Register fully available low RAM pages with the bootmem allocator. 305 */ 306 { 307 unsigned long curr_pfn, last_pfn, pages; 308 309 /* 310 * We are rounding up the start address of usable memory: 311 */ 312 curr_pfn = PFN_UP(__MEMORY_START); 313 /* 314 * ... and at the end of the usable range downwards: 315 */ 316 last_pfn = PFN_DOWN(__pa(memory_end)); 317 318 if (last_pfn > max_low_pfn) 319 last_pfn = max_low_pfn; 320 321 pages = last_pfn - curr_pfn; 322 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn), 323 PFN_PHYS(pages)); 324 } 325 326 /* 327 * Reserve the kernel text and 328 * Reserve the bootmem bitmap. We do this in two steps (first step 329 * was init_bootmem()), because this catches the (definitely buggy) 330 * case of us accidentally initializing the bootmem allocator with 331 * an invalid RAM area. 332 */ 333 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE, 334 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START); 335 336 /* 337 * reserve physical page 0 - it's a special BIOS page on many boxes, 338 * enabling clean reboots, SMP operation, laptop functions. 339 */ 340 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE); 341 342 #ifdef CONFIG_BLK_DEV_INITRD 343 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); 344 if (&__rd_start != &__rd_end) { 345 LOADER_TYPE = 1; 346 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START; 347 INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start; 348 } 349 350 if (LOADER_TYPE && INITRD_START) { 351 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { 352 reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE); 353 initrd_start = 354 INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0; 355 initrd_end = initrd_start + INITRD_SIZE; 356 } else { 357 printk("initrd extends beyond end of memory " 358 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 359 INITRD_START + INITRD_SIZE, 360 max_low_pfn << PAGE_SHIFT); 361 initrd_start = 0; 362 } 363 } 364 #endif 365 366 #ifdef CONFIG_DUMMY_CONSOLE 367 conswitchp = &dummy_con; 368 #endif 369 370 /* Perform the machine specific initialisation */ 371 platform_setup(); 372 373 paging_init(); 374 } 375 376 struct sh_machine_vector* __init get_mv_byname(const char* name) 377 { 378 extern int strcasecmp(const char *, const char *); 379 extern long __machvec_start, __machvec_end; 380 struct sh_machine_vector *all_vecs = 381 (struct sh_machine_vector *)&__machvec_start; 382 383 int i, n = ((unsigned long)&__machvec_end 384 - (unsigned long)&__machvec_start)/ 385 sizeof(struct sh_machine_vector); 386 387 for (i = 0; i < n; ++i) { 388 struct sh_machine_vector *mv = &all_vecs[i]; 389 if (mv == NULL) 390 continue; 391 if (strcasecmp(name, get_system_type()) == 0) { 392 return mv; 393 } 394 } 395 return NULL; 396 } 397 398 static struct cpu cpu[NR_CPUS]; 399 400 static int __init topology_init(void) 401 { 402 int cpu_id; 403 404 for_each_possible_cpu(cpu_id) 405 register_cpu(&cpu[cpu_id], cpu_id, NULL); 406 407 return 0; 408 } 409 410 subsys_initcall(topology_init); 411 412 static const char *cpu_name[] = { 413 [CPU_SH7604] = "SH7604", 414 [CPU_SH7705] = "SH7705", 415 [CPU_SH7708] = "SH7708", 416 [CPU_SH7729] = "SH7729", 417 [CPU_SH7300] = "SH7300", 418 [CPU_SH7750] = "SH7750", 419 [CPU_SH7750S] = "SH7750S", 420 [CPU_SH7750R] = "SH7750R", 421 [CPU_SH7751] = "SH7751", 422 [CPU_SH7751R] = "SH7751R", 423 [CPU_SH7760] = "SH7760", 424 [CPU_SH73180] = "SH73180", 425 [CPU_ST40RA] = "ST40RA", 426 [CPU_ST40GX1] = "ST40GX1", 427 [CPU_SH4_202] = "SH4-202", 428 [CPU_SH4_501] = "SH4-501", 429 [CPU_SH7770] = "SH7770", 430 [CPU_SH7780] = "SH7780", 431 [CPU_SH7781] = "SH7781", 432 [CPU_SH_NONE] = "Unknown" 433 }; 434 435 const char *get_cpu_subtype(void) 436 { 437 return cpu_name[boot_cpu_data.type]; 438 } 439 440 #ifdef CONFIG_PROC_FS 441 static const char *cpu_flags[] = { 442 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", "ptea", NULL 443 }; 444 445 static void show_cpuflags(struct seq_file *m) 446 { 447 unsigned long i; 448 449 seq_printf(m, "cpu flags\t:"); 450 451 if (!cpu_data->flags) { 452 seq_printf(m, " %s\n", cpu_flags[0]); 453 return; 454 } 455 456 for (i = 0; cpu_flags[i]; i++) 457 if ((cpu_data->flags & (1 << i))) 458 seq_printf(m, " %s", cpu_flags[i+1]); 459 460 seq_printf(m, "\n"); 461 } 462 463 static void show_cacheinfo(struct seq_file *m, const char *type, struct cache_info info) 464 { 465 unsigned int cache_size; 466 467 cache_size = info.ways * info.sets * info.linesz; 468 469 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n", 470 type, cache_size >> 10, info.ways); 471 } 472 473 /* 474 * Get CPU information for use by the procfs. 475 */ 476 static int show_cpuinfo(struct seq_file *m, void *v) 477 { 478 unsigned int cpu = smp_processor_id(); 479 480 if (!cpu && cpu_online(cpu)) 481 seq_printf(m, "machine\t\t: %s\n", get_system_type()); 482 483 seq_printf(m, "processor\t: %d\n", cpu); 484 seq_printf(m, "cpu family\t: %s\n", system_utsname.machine); 485 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype()); 486 487 show_cpuflags(m); 488 489 seq_printf(m, "cache type\t: "); 490 491 /* 492 * Check for what type of cache we have, we support both the 493 * unified cache on the SH-2 and SH-3, as well as the harvard 494 * style cache on the SH-4. 495 */ 496 if (test_bit(SH_CACHE_COMBINED, &(boot_cpu_data.icache.flags))) { 497 seq_printf(m, "unified\n"); 498 show_cacheinfo(m, "cache", boot_cpu_data.icache); 499 } else { 500 seq_printf(m, "split (harvard)\n"); 501 show_cacheinfo(m, "icache", boot_cpu_data.icache); 502 show_cacheinfo(m, "dcache", boot_cpu_data.dcache); 503 } 504 505 seq_printf(m, "bogomips\t: %lu.%02lu\n", 506 boot_cpu_data.loops_per_jiffy/(500000/HZ), 507 (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100); 508 509 return show_clocks(m); 510 } 511 512 static void *c_start(struct seq_file *m, loff_t *pos) 513 { 514 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 515 } 516 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 517 { 518 ++*pos; 519 return c_start(m, pos); 520 } 521 static void c_stop(struct seq_file *m, void *v) 522 { 523 } 524 struct seq_operations cpuinfo_op = { 525 .start = c_start, 526 .next = c_next, 527 .stop = c_stop, 528 .show = show_cpuinfo, 529 }; 530 #endif /* CONFIG_PROC_FS */ 531 532 #ifdef CONFIG_SH_KGDB 533 /* 534 * Parse command-line kgdb options. By default KGDB is enabled, 535 * entered on error (or other action) using default serial info. 536 * The command-line option can include a serial port specification 537 * and an action to override default or configured behavior. 538 */ 539 struct kgdb_sermap kgdb_sci_sermap = 540 { "ttySC", 5, kgdb_sci_setup, NULL }; 541 542 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap; 543 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap; 544 545 void kgdb_register_sermap(struct kgdb_sermap *map) 546 { 547 struct kgdb_sermap *last; 548 549 for (last = kgdb_serlist; last->next; last = last->next) 550 ; 551 last->next = map; 552 if (!map->namelen) { 553 map->namelen = strlen(map->name); 554 } 555 } 556 557 static int __init kgdb_parse_options(char *options) 558 { 559 char c; 560 int baud; 561 562 /* Check for port spec (or use default) */ 563 564 /* Determine port type and instance */ 565 if (!memcmp(options, "tty", 3)) { 566 struct kgdb_sermap *map = kgdb_serlist; 567 568 while (map && memcmp(options, map->name, map->namelen)) 569 map = map->next; 570 571 if (!map) { 572 KGDB_PRINTK("unknown port spec in %s\n", options); 573 return -1; 574 } 575 576 kgdb_porttype = map; 577 kgdb_serial_setup = map->setup_fn; 578 kgdb_portnum = options[map->namelen] - '0'; 579 options += map->namelen + 1; 580 581 options = (*options == ',') ? options+1 : options; 582 583 /* Read optional parameters (baud/parity/bits) */ 584 baud = simple_strtoul(options, &options, 10); 585 if (baud != 0) { 586 kgdb_baud = baud; 587 588 c = toupper(*options); 589 if (c == 'E' || c == 'O' || c == 'N') { 590 kgdb_parity = c; 591 options++; 592 } 593 594 c = *options; 595 if (c == '7' || c == '8') { 596 kgdb_bits = c; 597 options++; 598 } 599 options = (*options == ',') ? options+1 : options; 600 } 601 } 602 603 /* Check for action specification */ 604 if (!memcmp(options, "halt", 4)) { 605 kgdb_halt = 1; 606 options += 4; 607 } else if (!memcmp(options, "disabled", 8)) { 608 kgdb_enabled = 0; 609 options += 8; 610 } 611 612 if (*options) { 613 KGDB_PRINTK("ignored unknown options: %s\n", options); 614 return 0; 615 } 616 return 1; 617 } 618 __setup("kgdb=", kgdb_parse_options); 619 #endif /* CONFIG_SH_KGDB */ 620 621