1 /* 2 * arch/xtensa/kernel/setup.c 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 1995 Linus Torvalds 9 * Copyright (C) 2001 - 2005 Tensilica Inc. 10 * 11 * Chris Zankel <chris@zankel.net> 12 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> 13 * Kevin Chea 14 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca> 15 */ 16 17 #include <linux/errno.h> 18 #include <linux/init.h> 19 #include <linux/proc_fs.h> 20 #include <linux/screen_info.h> 21 #include <linux/bootmem.h> 22 #include <linux/kernel.h> 23 24 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) 25 # include <linux/console.h> 26 #endif 27 28 #ifdef CONFIG_RTC 29 # include <linux/timex.h> 30 #endif 31 32 #ifdef CONFIG_PROC_FS 33 # include <linux/seq_file.h> 34 #endif 35 36 #include <asm/system.h> 37 #include <asm/bootparam.h> 38 #include <asm/pgtable.h> 39 #include <asm/processor.h> 40 #include <asm/timex.h> 41 #include <asm/platform.h> 42 #include <asm/page.h> 43 #include <asm/setup.h> 44 #include <asm/param.h> 45 46 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) 47 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16}; 48 #endif 49 50 #ifdef CONFIG_BLK_DEV_FD 51 extern struct fd_ops no_fd_ops; 52 struct fd_ops *fd_ops; 53 #endif 54 55 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) 56 extern struct ide_ops no_ide_ops; 57 struct ide_ops *ide_ops; 58 #endif 59 60 extern struct rtc_ops no_rtc_ops; 61 struct rtc_ops *rtc_ops; 62 63 #ifdef CONFIG_PC_KEYB 64 extern struct kbd_ops no_kbd_ops; 65 struct kbd_ops *kbd_ops; 66 #endif 67 68 #ifdef CONFIG_BLK_DEV_INITRD 69 extern void *initrd_start; 70 extern void *initrd_end; 71 extern void *__initrd_start; 72 extern void *__initrd_end; 73 int initrd_is_mapped = 0; 74 extern int initrd_below_start_ok; 75 #endif 76 77 unsigned char aux_device_present; 78 extern unsigned long loops_per_jiffy; 79 80 /* Command line specified as configuration option. */ 81 82 static char __initdata command_line[COMMAND_LINE_SIZE]; 83 84 #ifdef CONFIG_CMDLINE_BOOL 85 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; 86 #endif 87 88 sysmem_info_t __initdata sysmem; 89 90 #ifdef CONFIG_BLK_DEV_INITRD 91 int initrd_is_mapped; 92 #endif 93 94 extern void init_mmu(void); 95 96 /* 97 * Boot parameter parsing. 98 * 99 * The Xtensa port uses a list of variable-sized tags to pass data to 100 * the kernel. The first tag must be a BP_TAG_FIRST tag for the list 101 * to be recognised. The list is terminated with a zero-sized 102 * BP_TAG_LAST tag. 103 */ 104 105 typedef struct tagtable { 106 u32 tag; 107 int (*parse)(const bp_tag_t*); 108 } tagtable_t; 109 110 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \ 111 __attribute__((unused, __section__(".taglist"))) = { tag, fn } 112 113 /* parse current tag */ 114 115 static int __init parse_tag_mem(const bp_tag_t *tag) 116 { 117 meminfo_t *mi = (meminfo_t*)(tag->data); 118 119 if (mi->type != MEMORY_TYPE_CONVENTIONAL) 120 return -1; 121 122 if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) { 123 printk(KERN_WARNING 124 "Ignoring memory bank 0x%08lx size %ldKB\n", 125 (unsigned long)mi->start, 126 (unsigned long)mi->end - (unsigned long)mi->start); 127 return -EINVAL; 128 } 129 sysmem.bank[sysmem.nr_banks].type = mi->type; 130 sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start); 131 sysmem.bank[sysmem.nr_banks].end = mi->end & PAGE_SIZE; 132 sysmem.nr_banks++; 133 134 return 0; 135 } 136 137 __tagtable(BP_TAG_MEMORY, parse_tag_mem); 138 139 #ifdef CONFIG_BLK_DEV_INITRD 140 141 static int __init parse_tag_initrd(const bp_tag_t* tag) 142 { 143 meminfo_t* mi; 144 mi = (meminfo_t*)(tag->data); 145 initrd_start = (void*)(mi->start); 146 initrd_end = (void*)(mi->end); 147 148 return 0; 149 } 150 151 __tagtable(BP_TAG_INITRD, parse_tag_initrd); 152 153 #endif /* CONFIG_BLK_DEV_INITRD */ 154 155 static int __init parse_tag_cmdline(const bp_tag_t* tag) 156 { 157 strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE); 158 command_line[COMMAND_LINE_SIZE - 1] = '\0'; 159 return 0; 160 } 161 162 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline); 163 164 static int __init parse_bootparam(const bp_tag_t* tag) 165 { 166 extern tagtable_t __tagtable_begin, __tagtable_end; 167 tagtable_t *t; 168 169 /* Boot parameters must start with a BP_TAG_FIRST tag. */ 170 171 if (tag->id != BP_TAG_FIRST) { 172 printk(KERN_WARNING "Invalid boot parameters!\n"); 173 return 0; 174 } 175 176 tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size); 177 178 /* Parse all tags. */ 179 180 while (tag != NULL && tag->id != BP_TAG_LAST) { 181 for (t = &__tagtable_begin; t < &__tagtable_end; t++) { 182 if (tag->id == t->tag) { 183 t->parse(tag); 184 break; 185 } 186 } 187 if (t == &__tagtable_end) 188 printk(KERN_WARNING "Ignoring tag " 189 "0x%08x\n", tag->id); 190 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size); 191 } 192 193 return 0; 194 } 195 196 /* 197 * Initialize architecture. (Early stage) 198 */ 199 200 void __init init_arch(bp_tag_t *bp_start) 201 { 202 203 #ifdef CONFIG_BLK_DEV_INITRD 204 initrd_start = &__initrd_start; 205 initrd_end = &__initrd_end; 206 #endif 207 208 sysmem.nr_banks = 0; 209 210 #ifdef CONFIG_CMDLINE_BOOL 211 strcpy(command_line, default_command_line); 212 #endif 213 214 /* Parse boot parameters */ 215 216 if (bp_start) 217 parse_bootparam(bp_start); 218 219 if (sysmem.nr_banks == 0) { 220 sysmem.nr_banks = 1; 221 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START; 222 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START 223 + PLATFORM_DEFAULT_MEM_SIZE; 224 } 225 226 /* Early hook for platforms */ 227 228 platform_init(bp_start); 229 230 /* Initialize MMU. */ 231 232 init_mmu(); 233 } 234 235 /* 236 * Initialize system. Setup memory and reserve regions. 237 */ 238 239 extern char _end; 240 extern char _stext; 241 extern char _WindowVectors_text_start; 242 extern char _WindowVectors_text_end; 243 extern char _DebugInterruptVector_literal_start; 244 extern char _DebugInterruptVector_text_end; 245 extern char _KernelExceptionVector_literal_start; 246 extern char _KernelExceptionVector_text_end; 247 extern char _UserExceptionVector_literal_start; 248 extern char _UserExceptionVector_text_end; 249 extern char _DoubleExceptionVector_literal_start; 250 extern char _DoubleExceptionVector_text_end; 251 252 void __init setup_arch(char **cmdline_p) 253 { 254 extern int mem_reserve(unsigned long, unsigned long, int); 255 extern void bootmem_init(void); 256 257 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 258 boot_command_line[COMMAND_LINE_SIZE-1] = '\0'; 259 *cmdline_p = command_line; 260 261 /* Reserve some memory regions */ 262 263 #ifdef CONFIG_BLK_DEV_INITRD 264 if (initrd_start < initrd_end) { 265 initrd_is_mapped = mem_reserve(__pa(initrd_start), 266 __pa(initrd_end), 0); 267 initrd_below_start_ok = 1; 268 } else { 269 initrd_start = 0; 270 } 271 #endif 272 273 mem_reserve(__pa(&_stext),__pa(&_end), 1); 274 275 mem_reserve(__pa(&_WindowVectors_text_start), 276 __pa(&_WindowVectors_text_end), 0); 277 278 mem_reserve(__pa(&_DebugInterruptVector_literal_start), 279 __pa(&_DebugInterruptVector_text_end), 0); 280 281 mem_reserve(__pa(&_KernelExceptionVector_literal_start), 282 __pa(&_KernelExceptionVector_text_end), 0); 283 284 mem_reserve(__pa(&_UserExceptionVector_literal_start), 285 __pa(&_UserExceptionVector_text_end), 0); 286 287 mem_reserve(__pa(&_DoubleExceptionVector_literal_start), 288 __pa(&_DoubleExceptionVector_text_end), 0); 289 290 bootmem_init(); 291 292 platform_setup(cmdline_p); 293 294 295 paging_init(); 296 297 #ifdef CONFIG_VT 298 # if defined(CONFIG_VGA_CONSOLE) 299 conswitchp = &vga_con; 300 # elif defined(CONFIG_DUMMY_CONSOLE) 301 conswitchp = &dummy_con; 302 # endif 303 #endif 304 305 #ifdef CONFIG_PCI 306 platform_pcibios_init(); 307 #endif 308 } 309 310 void machine_restart(char * cmd) 311 { 312 platform_restart(); 313 } 314 315 void machine_halt(void) 316 { 317 platform_halt(); 318 while (1); 319 } 320 321 void machine_power_off(void) 322 { 323 platform_power_off(); 324 while (1); 325 } 326 #ifdef CONFIG_PROC_FS 327 328 /* 329 * Display some core information through /proc/cpuinfo. 330 */ 331 332 static int 333 c_show(struct seq_file *f, void *slot) 334 { 335 /* high-level stuff */ 336 seq_printf(f,"processor\t: 0\n" 337 "vendor_id\t: Tensilica\n" 338 "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n" 339 "core ID\t\t: " XCHAL_CORE_ID "\n" 340 "build ID\t: 0x%x\n" 341 "byte order\t: %s\n" 342 "cpu MHz\t\t: %lu.%02lu\n" 343 "bogomips\t: %lu.%02lu\n", 344 XCHAL_BUILD_UNIQUE_ID, 345 XCHAL_HAVE_BE ? "big" : "little", 346 CCOUNT_PER_JIFFY/(1000000/HZ), 347 (CCOUNT_PER_JIFFY/(10000/HZ)) % 100, 348 loops_per_jiffy/(500000/HZ), 349 (loops_per_jiffy/(5000/HZ)) % 100); 350 351 seq_printf(f,"flags\t\t: " 352 #if XCHAL_HAVE_NMI 353 "nmi " 354 #endif 355 #if XCHAL_HAVE_DEBUG 356 "debug " 357 # if XCHAL_HAVE_OCD 358 "ocd " 359 # endif 360 #endif 361 #if XCHAL_HAVE_DENSITY 362 "density " 363 #endif 364 #if XCHAL_HAVE_BOOLEANS 365 "boolean " 366 #endif 367 #if XCHAL_HAVE_LOOPS 368 "loop " 369 #endif 370 #if XCHAL_HAVE_NSA 371 "nsa " 372 #endif 373 #if XCHAL_HAVE_MINMAX 374 "minmax " 375 #endif 376 #if XCHAL_HAVE_SEXT 377 "sext " 378 #endif 379 #if XCHAL_HAVE_CLAMPS 380 "clamps " 381 #endif 382 #if XCHAL_HAVE_MAC16 383 "mac16 " 384 #endif 385 #if XCHAL_HAVE_MUL16 386 "mul16 " 387 #endif 388 #if XCHAL_HAVE_MUL32 389 "mul32 " 390 #endif 391 #if XCHAL_HAVE_MUL32_HIGH 392 "mul32h " 393 #endif 394 #if XCHAL_HAVE_FP 395 "fpu " 396 #endif 397 "\n"); 398 399 /* Registers. */ 400 seq_printf(f,"physical aregs\t: %d\n" 401 "misc regs\t: %d\n" 402 "ibreak\t\t: %d\n" 403 "dbreak\t\t: %d\n", 404 XCHAL_NUM_AREGS, 405 XCHAL_NUM_MISC_REGS, 406 XCHAL_NUM_IBREAK, 407 XCHAL_NUM_DBREAK); 408 409 410 /* Interrupt. */ 411 seq_printf(f,"num ints\t: %d\n" 412 "ext ints\t: %d\n" 413 "int levels\t: %d\n" 414 "timers\t\t: %d\n" 415 "debug level\t: %d\n", 416 XCHAL_NUM_INTERRUPTS, 417 XCHAL_NUM_EXTINTERRUPTS, 418 XCHAL_NUM_INTLEVELS, 419 XCHAL_NUM_TIMERS, 420 XCHAL_DEBUGLEVEL); 421 422 /* Cache */ 423 seq_printf(f,"icache line size: %d\n" 424 "icache ways\t: %d\n" 425 "icache size\t: %d\n" 426 "icache flags\t: " 427 #if XCHAL_ICACHE_LINE_LOCKABLE 428 "lock" 429 #endif 430 "\n" 431 "dcache line size: %d\n" 432 "dcache ways\t: %d\n" 433 "dcache size\t: %d\n" 434 "dcache flags\t: " 435 #if XCHAL_DCACHE_IS_WRITEBACK 436 "writeback" 437 #endif 438 #if XCHAL_DCACHE_LINE_LOCKABLE 439 "lock" 440 #endif 441 "\n", 442 XCHAL_ICACHE_LINESIZE, 443 XCHAL_ICACHE_WAYS, 444 XCHAL_ICACHE_SIZE, 445 XCHAL_DCACHE_LINESIZE, 446 XCHAL_DCACHE_WAYS, 447 XCHAL_DCACHE_SIZE); 448 449 return 0; 450 } 451 452 /* 453 * We show only CPU #0 info. 454 */ 455 static void * 456 c_start(struct seq_file *f, loff_t *pos) 457 { 458 return (void *) ((*pos == 0) ? (void *)1 : NULL); 459 } 460 461 static void * 462 c_next(struct seq_file *f, void *v, loff_t *pos) 463 { 464 return NULL; 465 } 466 467 static void 468 c_stop(struct seq_file *f, void *v) 469 { 470 } 471 472 struct seq_operations cpuinfo_op = 473 { 474 start: c_start, 475 next: c_next, 476 stop: c_stop, 477 show: c_show 478 }; 479 480 #endif /* CONFIG_PROC_FS */ 481 482