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/io_generic.h> 26 #include <asm/sections.h> 27 #include <asm/irq.h> 28 #include <asm/setup.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, 0, 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 #if defined(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_GENERIC 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 #ifdef CONFIG_SH_UNKNOWN 210 sh_mv = mv_unknown; 211 #endif 212 213 /* 214 * Manually walk the vec, fill in anything that the board hasn't yet 215 * by hand, wrapping to the generic implementation. 216 */ 217 #define mv_set(elem) do { \ 218 if (!sh_mv.mv_##elem) \ 219 sh_mv.mv_##elem = generic_##elem; \ 220 } while (0) 221 222 mv_set(inb); mv_set(inw); mv_set(inl); 223 mv_set(outb); mv_set(outw); mv_set(outl); 224 225 mv_set(inb_p); mv_set(inw_p); mv_set(inl_p); 226 mv_set(outb_p); mv_set(outw_p); mv_set(outl_p); 227 228 mv_set(insb); mv_set(insw); mv_set(insl); 229 mv_set(outsb); mv_set(outsw); mv_set(outsl); 230 231 mv_set(readb); mv_set(readw); mv_set(readl); 232 mv_set(writeb); mv_set(writew); mv_set(writel); 233 234 mv_set(ioremap); 235 mv_set(iounmap); 236 237 mv_set(isa_port2addr); 238 mv_set(irq_demux); 239 240 #ifdef CONFIG_SH_UNKNOWN 241 __set_io_port_base(mv_io_base); 242 #endif 243 244 return 0; 245 } 246 247 void __init setup_arch(char **cmdline_p) 248 { 249 unsigned long bootmap_size; 250 unsigned long start_pfn, max_pfn, max_low_pfn; 251 252 #ifdef CONFIG_EARLY_PRINTK 253 extern void enable_early_printk(void); 254 255 enable_early_printk(); 256 #endif 257 #ifdef CONFIG_CMDLINE_BOOL 258 strcpy(COMMAND_LINE, CONFIG_CMDLINE); 259 #endif 260 261 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 262 263 #ifdef CONFIG_BLK_DEV_RAM 264 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 265 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 266 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 267 #endif 268 269 if (!MOUNT_ROOT_RDONLY) 270 root_mountflags &= ~MS_RDONLY; 271 init_mm.start_code = (unsigned long) _text; 272 init_mm.end_code = (unsigned long) _etext; 273 init_mm.end_data = (unsigned long) _edata; 274 init_mm.brk = (unsigned long) _end; 275 276 code_resource.start = virt_to_bus(_text); 277 code_resource.end = virt_to_bus(_etext)-1; 278 data_resource.start = virt_to_bus(_etext); 279 data_resource.end = virt_to_bus(_edata)-1; 280 281 sh_mv_setup(cmdline_p); 282 283 #define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) 284 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) 285 #define PFN_PHYS(x) ((x) << PAGE_SHIFT) 286 287 #ifdef CONFIG_DISCONTIGMEM 288 NODE_DATA(0)->bdata = &discontig_node_bdata[0]; 289 NODE_DATA(1)->bdata = &discontig_node_bdata[1]; 290 291 bootmap_size = init_bootmem_node(NODE_DATA(1), 292 PFN_UP(__MEMORY_START_2ND), 293 PFN_UP(__MEMORY_START_2ND), 294 PFN_DOWN(__MEMORY_START_2ND+__MEMORY_SIZE_2ND)); 295 free_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, __MEMORY_SIZE_2ND); 296 reserve_bootmem_node(NODE_DATA(1), __MEMORY_START_2ND, bootmap_size); 297 #endif 298 299 /* 300 * Find the highest page frame number we have available 301 */ 302 max_pfn = PFN_DOWN(__pa(memory_end)); 303 304 /* 305 * Determine low and high memory ranges: 306 */ 307 max_low_pfn = max_pfn; 308 309 /* 310 * Partially used pages are not usable - thus 311 * we are rounding upwards: 312 */ 313 start_pfn = PFN_UP(__pa(_end)); 314 315 /* 316 * Find a proper area for the bootmem bitmap. After this 317 * bootstrap step all allocations (until the page allocator 318 * is intact) must be done via bootmem_alloc(). 319 */ 320 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn, 321 __MEMORY_START>>PAGE_SHIFT, 322 max_low_pfn); 323 /* 324 * Register fully available low RAM pages with the bootmem allocator. 325 */ 326 { 327 unsigned long curr_pfn, last_pfn, pages; 328 329 /* 330 * We are rounding up the start address of usable memory: 331 */ 332 curr_pfn = PFN_UP(__MEMORY_START); 333 /* 334 * ... and at the end of the usable range downwards: 335 */ 336 last_pfn = PFN_DOWN(__pa(memory_end)); 337 338 if (last_pfn > max_low_pfn) 339 last_pfn = max_low_pfn; 340 341 pages = last_pfn - curr_pfn; 342 free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn), 343 PFN_PHYS(pages)); 344 } 345 346 /* 347 * Reserve the kernel text and 348 * Reserve the bootmem bitmap. We do this in two steps (first step 349 * was init_bootmem()), because this catches the (definitely buggy) 350 * case of us accidentally initializing the bootmem allocator with 351 * an invalid RAM area. 352 */ 353 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE, 354 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START); 355 356 /* 357 * reserve physical page 0 - it's a special BIOS page on many boxes, 358 * enabling clean reboots, SMP operation, laptop functions. 359 */ 360 reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE); 361 362 #ifdef CONFIG_BLK_DEV_INITRD 363 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); 364 if (&__rd_start != &__rd_end) { 365 LOADER_TYPE = 1; 366 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START; 367 INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start; 368 } 369 370 if (LOADER_TYPE && INITRD_START) { 371 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { 372 reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE); 373 initrd_start = 374 INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0; 375 initrd_end = initrd_start + INITRD_SIZE; 376 } else { 377 printk("initrd extends beyond end of memory " 378 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 379 INITRD_START + INITRD_SIZE, 380 max_low_pfn << PAGE_SHIFT); 381 initrd_start = 0; 382 } 383 } 384 #endif 385 386 #ifdef CONFIG_DUMMY_CONSOLE 387 conswitchp = &dummy_con; 388 #endif 389 390 /* Perform the machine specific initialisation */ 391 platform_setup(); 392 393 paging_init(); 394 } 395 396 struct sh_machine_vector* __init get_mv_byname(const char* name) 397 { 398 extern int strcasecmp(const char *, const char *); 399 extern long __machvec_start, __machvec_end; 400 struct sh_machine_vector *all_vecs = 401 (struct sh_machine_vector *)&__machvec_start; 402 403 int i, n = ((unsigned long)&__machvec_end 404 - (unsigned long)&__machvec_start)/ 405 sizeof(struct sh_machine_vector); 406 407 for (i = 0; i < n; ++i) { 408 struct sh_machine_vector *mv = &all_vecs[i]; 409 if (mv == NULL) 410 continue; 411 if (strcasecmp(name, get_system_type()) == 0) { 412 return mv; 413 } 414 } 415 return NULL; 416 } 417 418 static struct cpu cpu[NR_CPUS]; 419 420 static int __init topology_init(void) 421 { 422 int cpu_id; 423 424 for (cpu_id = 0; cpu_id < NR_CPUS; cpu_id++) 425 if (cpu_possible(cpu_id)) 426 register_cpu(&cpu[cpu_id], cpu_id, NULL); 427 428 return 0; 429 } 430 431 subsys_initcall(topology_init); 432 433 static const char *cpu_name[] = { 434 [CPU_SH7604] = "SH7604", 435 [CPU_SH7705] = "SH7705", 436 [CPU_SH7708] = "SH7708", 437 [CPU_SH7729] = "SH7729", 438 [CPU_SH7300] = "SH7300", 439 [CPU_SH7750] = "SH7750", 440 [CPU_SH7750S] = "SH7750S", 441 [CPU_SH7750R] = "SH7750R", 442 [CPU_SH7751] = "SH7751", 443 [CPU_SH7751R] = "SH7751R", 444 [CPU_SH7760] = "SH7760", 445 [CPU_SH73180] = "SH73180", 446 [CPU_ST40RA] = "ST40RA", 447 [CPU_ST40GX1] = "ST40GX1", 448 [CPU_SH4_202] = "SH4-202", 449 [CPU_SH4_501] = "SH4-501", 450 [CPU_SH_NONE] = "Unknown" 451 }; 452 453 const char *get_cpu_subtype(void) 454 { 455 return cpu_name[boot_cpu_data.type]; 456 } 457 458 #ifdef CONFIG_PROC_FS 459 static const char *cpu_flags[] = { 460 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", 461 }; 462 463 static void show_cpuflags(struct seq_file *m) 464 { 465 unsigned long i; 466 467 seq_printf(m, "cpu flags\t:"); 468 469 if (!cpu_data->flags) { 470 seq_printf(m, " %s\n", cpu_flags[0]); 471 return; 472 } 473 474 for (i = 0; i < cpu_data->flags; i++) 475 if ((cpu_data->flags & (1 << i))) 476 seq_printf(m, " %s", cpu_flags[i+1]); 477 478 seq_printf(m, "\n"); 479 } 480 481 static void show_cacheinfo(struct seq_file *m, const char *type, struct cache_info info) 482 { 483 unsigned int cache_size; 484 485 cache_size = info.ways * info.sets * info.linesz; 486 487 seq_printf(m, "%s size\t: %dKiB\n", type, cache_size >> 10); 488 } 489 490 /* 491 * Get CPU information for use by the procfs. 492 */ 493 static int show_cpuinfo(struct seq_file *m, void *v) 494 { 495 unsigned int cpu = smp_processor_id(); 496 497 if (!cpu && cpu_online(cpu)) 498 seq_printf(m, "machine\t\t: %s\n", get_system_type()); 499 500 seq_printf(m, "processor\t: %d\n", cpu); 501 seq_printf(m, "cpu family\t: %s\n", system_utsname.machine); 502 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype()); 503 504 show_cpuflags(m); 505 506 seq_printf(m, "cache type\t: "); 507 508 /* 509 * Check for what type of cache we have, we support both the 510 * unified cache on the SH-2 and SH-3, as well as the harvard 511 * style cache on the SH-4. 512 */ 513 if (test_bit(SH_CACHE_COMBINED, &(boot_cpu_data.icache.flags))) { 514 seq_printf(m, "unified\n"); 515 show_cacheinfo(m, "cache", boot_cpu_data.icache); 516 } else { 517 seq_printf(m, "split (harvard)\n"); 518 show_cacheinfo(m, "icache", boot_cpu_data.icache); 519 show_cacheinfo(m, "dcache", boot_cpu_data.dcache); 520 } 521 522 seq_printf(m, "bogomips\t: %lu.%02lu\n", 523 boot_cpu_data.loops_per_jiffy/(500000/HZ), 524 (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100); 525 526 #define PRINT_CLOCK(name, value) \ 527 seq_printf(m, name " clock\t: %d.%02dMHz\n", \ 528 ((value) / 1000000), ((value) % 1000000)/10000) 529 530 PRINT_CLOCK("cpu", boot_cpu_data.cpu_clock); 531 PRINT_CLOCK("bus", boot_cpu_data.bus_clock); 532 #ifdef CONFIG_CPU_SUBTYPE_ST40STB1 533 PRINT_CLOCK("memory", boot_cpu_data.memory_clock); 534 #endif 535 PRINT_CLOCK("module", boot_cpu_data.module_clock); 536 537 return 0; 538 } 539 540 541 static void *c_start(struct seq_file *m, loff_t *pos) 542 { 543 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 544 } 545 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 546 { 547 ++*pos; 548 return c_start(m, pos); 549 } 550 static void c_stop(struct seq_file *m, void *v) 551 { 552 } 553 struct seq_operations cpuinfo_op = { 554 .start = c_start, 555 .next = c_next, 556 .stop = c_stop, 557 .show = show_cpuinfo, 558 }; 559 #endif /* CONFIG_PROC_FS */ 560 561 #ifdef CONFIG_SH_KGDB 562 /* 563 * Parse command-line kgdb options. By default KGDB is enabled, 564 * entered on error (or other action) using default serial info. 565 * The command-line option can include a serial port specification 566 * and an action to override default or configured behavior. 567 */ 568 struct kgdb_sermap kgdb_sci_sermap = 569 { "ttySC", 5, kgdb_sci_setup, NULL }; 570 571 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap; 572 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap; 573 574 void kgdb_register_sermap(struct kgdb_sermap *map) 575 { 576 struct kgdb_sermap *last; 577 578 for (last = kgdb_serlist; last->next; last = last->next) 579 ; 580 last->next = map; 581 if (!map->namelen) { 582 map->namelen = strlen(map->name); 583 } 584 } 585 586 static int __init kgdb_parse_options(char *options) 587 { 588 char c; 589 int baud; 590 591 /* Check for port spec (or use default) */ 592 593 /* Determine port type and instance */ 594 if (!memcmp(options, "tty", 3)) { 595 struct kgdb_sermap *map = kgdb_serlist; 596 597 while (map && memcmp(options, map->name, map->namelen)) 598 map = map->next; 599 600 if (!map) { 601 KGDB_PRINTK("unknown port spec in %s\n", options); 602 return -1; 603 } 604 605 kgdb_porttype = map; 606 kgdb_serial_setup = map->setup_fn; 607 kgdb_portnum = options[map->namelen] - '0'; 608 options += map->namelen + 1; 609 610 options = (*options == ',') ? options+1 : options; 611 612 /* Read optional parameters (baud/parity/bits) */ 613 baud = simple_strtoul(options, &options, 10); 614 if (baud != 0) { 615 kgdb_baud = baud; 616 617 c = toupper(*options); 618 if (c == 'E' || c == 'O' || c == 'N') { 619 kgdb_parity = c; 620 options++; 621 } 622 623 c = *options; 624 if (c == '7' || c == '8') { 625 kgdb_bits = c; 626 options++; 627 } 628 options = (*options == ',') ? options+1 : options; 629 } 630 } 631 632 /* Check for action specification */ 633 if (!memcmp(options, "halt", 4)) { 634 kgdb_halt = 1; 635 options += 4; 636 } else if (!memcmp(options, "disabled", 8)) { 637 kgdb_enabled = 0; 638 options += 8; 639 } 640 641 if (*options) { 642 KGDB_PRINTK("ignored unknown options: %s\n", options); 643 return 0; 644 } 645 return 1; 646 } 647 __setup("kgdb=", kgdb_parse_options); 648 #endif /* CONFIG_SH_KGDB */ 649 650