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 <asm/uaccess.h> 24 #include <asm/io.h> 25 #include <asm/sections.h> 26 #include <asm/irq.h> 27 #include <asm/setup.h> 28 #include <asm/clock.h> 29 30 #ifdef CONFIG_SH_KGDB 31 #include <asm/kgdb.h> 32 static int kgdb_parse_options(char *options); 33 #endif 34 extern void * __rd_start, * __rd_end; 35 /* 36 * Machine setup.. 37 */ 38 39 /* 40 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 41 * This value will be used at the very early stage of serial setup. 42 * The bigger value means no problem. 43 */ 44 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, }; 45 struct screen_info screen_info; 46 47 #if defined(CONFIG_SH_UNKNOWN) 48 struct sh_machine_vector sh_mv; 49 #endif 50 51 /* We need this to satisfy some external references. */ 52 struct screen_info screen_info = { 53 0, 25, /* orig-x, orig-y */ 54 0, /* unused */ 55 0, /* orig-video-page */ 56 0, /* orig-video-mode */ 57 80, /* orig-video-cols */ 58 0,0,0, /* ega_ax, ega_bx, ega_cx */ 59 25, /* orig-video-lines */ 60 0, /* orig-video-isVGA */ 61 16 /* orig-video-points */ 62 }; 63 64 extern void platform_setup(void); 65 extern char *get_system_type(void); 66 extern int root_mountflags; 67 68 #define MV_NAME_SIZE 32 69 70 static struct sh_machine_vector* __init get_mv_byname(const char* name); 71 72 /* 73 * This is set up by the setup-routine at boot-time 74 */ 75 #define PARAM ((unsigned char *)empty_zero_page) 76 77 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000)) 78 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004)) 79 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008)) 80 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c)) 81 #define INITRD_START (*(unsigned long *) (PARAM+0x010)) 82 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014)) 83 /* ... */ 84 #define COMMAND_LINE ((char *) (PARAM+0x100)) 85 86 #define RAMDISK_IMAGE_START_MASK 0x07FF 87 #define RAMDISK_PROMPT_FLAG 0x8000 88 #define RAMDISK_LOAD_FLAG 0x4000 89 90 static char command_line[COMMAND_LINE_SIZE] = { 0, }; 91 92 struct resource standard_io_resources[] = { 93 { "dma1", 0x00, 0x1f }, 94 { "pic1", 0x20, 0x3f }, 95 { "timer", 0x40, 0x5f }, 96 { "keyboard", 0x60, 0x6f }, 97 { "dma page reg", 0x80, 0x8f }, 98 { "pic2", 0xa0, 0xbf }, 99 { "dma2", 0xc0, 0xdf }, 100 { "fpu", 0xf0, 0xff } 101 }; 102 103 #define STANDARD_IO_RESOURCES (sizeof(standard_io_resources)/sizeof(struct resource)) 104 105 /* System RAM - interrupted by the 640kB-1M hole */ 106 #define code_resource (ram_resources[3]) 107 #define data_resource (ram_resources[4]) 108 static struct resource ram_resources[] = { 109 { "System RAM", 0x000000, 0x09ffff, IORESOURCE_BUSY }, 110 { "System RAM", 0x100000, 0x100000, IORESOURCE_BUSY }, 111 { "Video RAM area", 0x0a0000, 0x0bffff }, 112 { "Kernel code", 0x100000, 0 }, 113 { "Kernel data", 0, 0 } 114 }; 115 116 unsigned long memory_start, memory_end; 117 118 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE], 119 struct sh_machine_vector** mvp, 120 unsigned long *mv_io_base, 121 int *mv_mmio_enable) 122 { 123 char c = ' ', *to = command_line, *from = COMMAND_LINE; 124 int len = 0; 125 126 /* Save unparsed command line copy for /proc/cmdline */ 127 memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 128 saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; 129 130 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START; 131 memory_end = memory_start + __MEMORY_SIZE; 132 133 for (;;) { 134 /* 135 * "mem=XXX[kKmM]" defines a size of memory. 136 */ 137 if (c == ' ' && !memcmp(from, "mem=", 4)) { 138 if (to != command_line) 139 to--; 140 { 141 unsigned long mem_size; 142 143 mem_size = memparse(from+4, &from); 144 memory_end = memory_start + mem_size; 145 } 146 } 147 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) { 148 char* mv_end; 149 char* mv_comma; 150 int mv_len; 151 if (to != command_line) 152 to--; 153 from += 6; 154 mv_end = strchr(from, ' '); 155 if (mv_end == NULL) 156 mv_end = from + strlen(from); 157 158 mv_comma = strchr(from, ','); 159 if ((mv_comma != NULL) && (mv_comma < mv_end)) { 160 int ints[3]; 161 get_options(mv_comma+1, ARRAY_SIZE(ints), ints); 162 *mv_io_base = ints[1]; 163 *mv_mmio_enable = ints[2]; 164 mv_len = mv_comma - from; 165 } else { 166 mv_len = mv_end - from; 167 } 168 if (mv_len > (MV_NAME_SIZE-1)) 169 mv_len = MV_NAME_SIZE-1; 170 memcpy(mv_name, from, mv_len); 171 mv_name[mv_len] = '\0'; 172 from = mv_end; 173 174 *mvp = get_mv_byname(mv_name); 175 } 176 c = *(from++); 177 if (!c) 178 break; 179 if (COMMAND_LINE_SIZE <= ++len) 180 break; 181 *(to++) = c; 182 } 183 *to = '\0'; 184 *cmdline_p = command_line; 185 } 186 187 static int __init sh_mv_setup(char **cmdline_p) 188 { 189 #ifdef CONFIG_SH_UNKNOWN 190 extern struct sh_machine_vector mv_unknown; 191 #endif 192 struct sh_machine_vector *mv = NULL; 193 char mv_name[MV_NAME_SIZE] = ""; 194 unsigned long mv_io_base = 0; 195 int mv_mmio_enable = 0; 196 197 parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable); 198 199 #ifdef CONFIG_SH_UNKNOWN 200 if (mv == NULL) { 201 mv = &mv_unknown; 202 if (*mv_name != '\0') { 203 printk("Warning: Unsupported machine %s, using unknown\n", 204 mv_name); 205 } 206 } 207 sh_mv = *mv; 208 #endif 209 210 /* 211 * Manually walk the vec, fill in anything that the board hasn't yet 212 * by hand, wrapping to the generic implementation. 213 */ 214 #define mv_set(elem) do { \ 215 if (!sh_mv.mv_##elem) \ 216 sh_mv.mv_##elem = generic_##elem; \ 217 } while (0) 218 219 mv_set(inb); mv_set(inw); mv_set(inl); 220 mv_set(outb); mv_set(outw); mv_set(outl); 221 222 mv_set(inb_p); mv_set(inw_p); mv_set(inl_p); 223 mv_set(outb_p); mv_set(outw_p); mv_set(outl_p); 224 225 mv_set(insb); mv_set(insw); mv_set(insl); 226 mv_set(outsb); mv_set(outsw); mv_set(outsl); 227 228 mv_set(readb); mv_set(readw); mv_set(readl); 229 mv_set(writeb); mv_set(writew); mv_set(writel); 230 231 mv_set(ioport_map); 232 mv_set(ioport_unmap); 233 mv_set(irq_demux); 234 235 #ifdef CONFIG_SH_UNKNOWN 236 __set_io_port_base(mv_io_base); 237 #endif 238 239 return 0; 240 } 241 242 void __init setup_arch(char **cmdline_p) 243 { 244 unsigned long bootmap_size; 245 unsigned long start_pfn, max_pfn, max_low_pfn; 246 247 #ifdef CONFIG_EARLY_PRINTK 248 extern void enable_early_printk(void); 249 250 enable_early_printk(); 251 #endif 252 #ifdef CONFIG_CMDLINE_BOOL 253 strcpy(COMMAND_LINE, CONFIG_CMDLINE); 254 #endif 255 256 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 257 258 #ifdef CONFIG_BLK_DEV_RAM 259 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 260 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 261 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 262 #endif 263 264 if (!MOUNT_ROOT_RDONLY) 265 root_mountflags &= ~MS_RDONLY; 266 init_mm.start_code = (unsigned long) _text; 267 init_mm.end_code = (unsigned long) _etext; 268 init_mm.end_data = (unsigned long) _edata; 269 init_mm.brk = (unsigned long) _end; 270 271 code_resource.start = (unsigned long)virt_to_phys(_text); 272 code_resource.end = (unsigned long)virt_to_phys(_etext)-1; 273 data_resource.start = (unsigned long)virt_to_phys(_etext); 274 data_resource.end = (unsigned long)virt_to_phys(_edata)-1; 275 276 sh_mv_setup(cmdline_p); 277 278 #define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) 279 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) 280 #define PFN_PHYS(x) ((x) << PAGE_SHIFT) 281 282 /* 283 * Find the highest page frame number we have available 284 */ 285 max_pfn = PFN_DOWN(__pa(memory_end)); 286 287 /* 288 * Determine low and high memory ranges: 289 */ 290 max_low_pfn = max_pfn; 291 292 /* 293 * Partially used pages are not usable - thus 294 * we are rounding upwards: 295 */ 296 start_pfn = PFN_UP(__pa(_end)); 297 298 /* 299 * Find a proper area for the bootmem bitmap. After this 300 * bootstrap step all allocations (until the page allocator 301 * is intact) must be done via bootmem_alloc(). 302 */ 303 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn, 304 __MEMORY_START>>PAGE_SHIFT, 305 max_low_pfn); 306 /* 307 * Register fully available low RAM pages with the bootmem allocator. 308 */ 309 { 310 unsigned long curr_pfn, last_pfn, pages; 311 312 /* 313 * We are rounding up the start address of usable memory: 314 */ 315 curr_pfn = PFN_UP(__MEMORY_START); 316 /* 317 * ... and at the end of the usable range downwards: 318 */ 319 last_pfn = PFN_DOWN(__pa(memory_end)); 320 321 if (last_pfn > max_low_pfn) 322 last_pfn = max_low_pfn; 323 324 pages = last_pfn - curr_pfn; 325 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn), 326 PFN_PHYS(pages)); 327 } 328 329 /* 330 * Reserve the kernel text and 331 * Reserve the bootmem bitmap. We do this in two steps (first step 332 * was init_bootmem()), because this catches the (definitely buggy) 333 * case of us accidentally initializing the bootmem allocator with 334 * an invalid RAM area. 335 */ 336 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE, 337 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START); 338 339 /* 340 * reserve physical page 0 - it's a special BIOS page on many boxes, 341 * enabling clean reboots, SMP operation, laptop functions. 342 */ 343 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE); 344 345 #ifdef CONFIG_BLK_DEV_INITRD 346 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); 347 if (&__rd_start != &__rd_end) { 348 LOADER_TYPE = 1; 349 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START; 350 INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start; 351 } 352 353 if (LOADER_TYPE && INITRD_START) { 354 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { 355 reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE); 356 initrd_start = 357 INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0; 358 initrd_end = initrd_start + INITRD_SIZE; 359 } else { 360 printk("initrd extends beyond end of memory " 361 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 362 INITRD_START + INITRD_SIZE, 363 max_low_pfn << PAGE_SHIFT); 364 initrd_start = 0; 365 } 366 } 367 #endif 368 369 #ifdef CONFIG_DUMMY_CONSOLE 370 conswitchp = &dummy_con; 371 #endif 372 373 /* Perform the machine specific initialisation */ 374 platform_setup(); 375 376 paging_init(); 377 } 378 379 struct sh_machine_vector* __init get_mv_byname(const char* name) 380 { 381 extern int strcasecmp(const char *, const char *); 382 extern long __machvec_start, __machvec_end; 383 struct sh_machine_vector *all_vecs = 384 (struct sh_machine_vector *)&__machvec_start; 385 386 int i, n = ((unsigned long)&__machvec_end 387 - (unsigned long)&__machvec_start)/ 388 sizeof(struct sh_machine_vector); 389 390 for (i = 0; i < n; ++i) { 391 struct sh_machine_vector *mv = &all_vecs[i]; 392 if (mv == NULL) 393 continue; 394 if (strcasecmp(name, get_system_type()) == 0) { 395 return mv; 396 } 397 } 398 return NULL; 399 } 400 401 static struct cpu cpu[NR_CPUS]; 402 403 static int __init topology_init(void) 404 { 405 int cpu_id; 406 407 for (cpu_id = 0; cpu_id < NR_CPUS; cpu_id++) 408 if (cpu_possible(cpu_id)) 409 register_cpu(&cpu[cpu_id], cpu_id, NULL); 410 411 return 0; 412 } 413 414 subsys_initcall(topology_init); 415 416 static const char *cpu_name[] = { 417 [CPU_SH7604] = "SH7604", 418 [CPU_SH7705] = "SH7705", 419 [CPU_SH7708] = "SH7708", 420 [CPU_SH7729] = "SH7729", 421 [CPU_SH7300] = "SH7300", 422 [CPU_SH7750] = "SH7750", 423 [CPU_SH7750S] = "SH7750S", 424 [CPU_SH7750R] = "SH7750R", 425 [CPU_SH7751] = "SH7751", 426 [CPU_SH7751R] = "SH7751R", 427 [CPU_SH7760] = "SH7760", 428 [CPU_SH73180] = "SH73180", 429 [CPU_ST40RA] = "ST40RA", 430 [CPU_ST40GX1] = "ST40GX1", 431 [CPU_SH4_202] = "SH4-202", 432 [CPU_SH4_501] = "SH4-501", 433 [CPU_SH7770] = "SH7770", 434 [CPU_SH7780] = "SH7780", 435 [CPU_SH7781] = "SH7781", 436 [CPU_SH_NONE] = "Unknown" 437 }; 438 439 const char *get_cpu_subtype(void) 440 { 441 return cpu_name[boot_cpu_data.type]; 442 } 443 444 #ifdef CONFIG_PROC_FS 445 static const char *cpu_flags[] = { 446 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", "ptea", NULL 447 }; 448 449 static void show_cpuflags(struct seq_file *m) 450 { 451 unsigned long i; 452 453 seq_printf(m, "cpu flags\t:"); 454 455 if (!cpu_data->flags) { 456 seq_printf(m, " %s\n", cpu_flags[0]); 457 return; 458 } 459 460 for (i = 0; cpu_flags[i]; i++) 461 if ((cpu_data->flags & (1 << i))) 462 seq_printf(m, " %s", cpu_flags[i+1]); 463 464 seq_printf(m, "\n"); 465 } 466 467 static void show_cacheinfo(struct seq_file *m, const char *type, struct cache_info info) 468 { 469 unsigned int cache_size; 470 471 cache_size = info.ways * info.sets * info.linesz; 472 473 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n", 474 type, cache_size >> 10, info.ways); 475 } 476 477 /* 478 * Get CPU information for use by the procfs. 479 */ 480 static int show_cpuinfo(struct seq_file *m, void *v) 481 { 482 unsigned int cpu = smp_processor_id(); 483 484 if (!cpu && cpu_online(cpu)) 485 seq_printf(m, "machine\t\t: %s\n", get_system_type()); 486 487 seq_printf(m, "processor\t: %d\n", cpu); 488 seq_printf(m, "cpu family\t: %s\n", system_utsname.machine); 489 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype()); 490 491 show_cpuflags(m); 492 493 seq_printf(m, "cache type\t: "); 494 495 /* 496 * Check for what type of cache we have, we support both the 497 * unified cache on the SH-2 and SH-3, as well as the harvard 498 * style cache on the SH-4. 499 */ 500 if (test_bit(SH_CACHE_COMBINED, &(boot_cpu_data.icache.flags))) { 501 seq_printf(m, "unified\n"); 502 show_cacheinfo(m, "cache", boot_cpu_data.icache); 503 } else { 504 seq_printf(m, "split (harvard)\n"); 505 show_cacheinfo(m, "icache", boot_cpu_data.icache); 506 show_cacheinfo(m, "dcache", boot_cpu_data.dcache); 507 } 508 509 seq_printf(m, "bogomips\t: %lu.%02lu\n", 510 boot_cpu_data.loops_per_jiffy/(500000/HZ), 511 (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100); 512 513 return show_clocks(m); 514 } 515 516 static void *c_start(struct seq_file *m, loff_t *pos) 517 { 518 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 519 } 520 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 521 { 522 ++*pos; 523 return c_start(m, pos); 524 } 525 static void c_stop(struct seq_file *m, void *v) 526 { 527 } 528 struct seq_operations cpuinfo_op = { 529 .start = c_start, 530 .next = c_next, 531 .stop = c_stop, 532 .show = show_cpuinfo, 533 }; 534 #endif /* CONFIG_PROC_FS */ 535 536 #ifdef CONFIG_SH_KGDB 537 /* 538 * Parse command-line kgdb options. By default KGDB is enabled, 539 * entered on error (or other action) using default serial info. 540 * The command-line option can include a serial port specification 541 * and an action to override default or configured behavior. 542 */ 543 struct kgdb_sermap kgdb_sci_sermap = 544 { "ttySC", 5, kgdb_sci_setup, NULL }; 545 546 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap; 547 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap; 548 549 void kgdb_register_sermap(struct kgdb_sermap *map) 550 { 551 struct kgdb_sermap *last; 552 553 for (last = kgdb_serlist; last->next; last = last->next) 554 ; 555 last->next = map; 556 if (!map->namelen) { 557 map->namelen = strlen(map->name); 558 } 559 } 560 561 static int __init kgdb_parse_options(char *options) 562 { 563 char c; 564 int baud; 565 566 /* Check for port spec (or use default) */ 567 568 /* Determine port type and instance */ 569 if (!memcmp(options, "tty", 3)) { 570 struct kgdb_sermap *map = kgdb_serlist; 571 572 while (map && memcmp(options, map->name, map->namelen)) 573 map = map->next; 574 575 if (!map) { 576 KGDB_PRINTK("unknown port spec in %s\n", options); 577 return -1; 578 } 579 580 kgdb_porttype = map; 581 kgdb_serial_setup = map->setup_fn; 582 kgdb_portnum = options[map->namelen] - '0'; 583 options += map->namelen + 1; 584 585 options = (*options == ',') ? options+1 : options; 586 587 /* Read optional parameters (baud/parity/bits) */ 588 baud = simple_strtoul(options, &options, 10); 589 if (baud != 0) { 590 kgdb_baud = baud; 591 592 c = toupper(*options); 593 if (c == 'E' || c == 'O' || c == 'N') { 594 kgdb_parity = c; 595 options++; 596 } 597 598 c = *options; 599 if (c == '7' || c == '8') { 600 kgdb_bits = c; 601 options++; 602 } 603 options = (*options == ',') ? options+1 : options; 604 } 605 } 606 607 /* Check for action specification */ 608 if (!memcmp(options, "halt", 4)) { 609 kgdb_halt = 1; 610 options += 4; 611 } else if (!memcmp(options, "disabled", 8)) { 612 kgdb_enabled = 0; 613 options += 8; 614 } 615 616 if (*options) { 617 KGDB_PRINTK("ignored unknown options: %s\n", options); 618 return 0; 619 } 620 return 1; 621 } 622 __setup("kgdb=", kgdb_parse_options); 623 #endif /* CONFIG_SH_KGDB */ 624 625