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 - 2007 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/nodemask.h> 19#include <linux/cpu.h> 20#include <linux/pfn.h> 21#include <linux/fs.h> 22#include <linux/mm.h> 23#include <linux/kexec.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#include <asm/mmu_context.h> 31 32extern void * __rd_start, * __rd_end; 33 34/* 35 * Machine setup.. 36 */ 37 38/* 39 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 40 * This value will be used at the very early stage of serial setup. 41 * The bigger value means no problem. 42 */ 43struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, }; 44#ifdef CONFIG_VT 45struct screen_info screen_info; 46#endif 47 48#if defined(CONFIG_SH_UNKNOWN) 49struct sh_machine_vector sh_mv; 50#endif 51 52extern int root_mountflags; 53 54#define MV_NAME_SIZE 32 55 56static struct sh_machine_vector* __init get_mv_byname(const char* name); 57 58/* 59 * This is set up by the setup-routine at boot-time 60 */ 61#define PARAM ((unsigned char *)empty_zero_page) 62 63#define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000)) 64#define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004)) 65#define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008)) 66#define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c)) 67#define INITRD_START (*(unsigned long *) (PARAM+0x010)) 68#define INITRD_SIZE (*(unsigned long *) (PARAM+0x014)) 69/* ... */ 70#define COMMAND_LINE ((char *) (PARAM+0x100)) 71 72#define RAMDISK_IMAGE_START_MASK 0x07FF 73#define RAMDISK_PROMPT_FLAG 0x8000 74#define RAMDISK_LOAD_FLAG 0x4000 75 76static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; 77 78static struct resource code_resource = { .name = "Kernel code", }; 79static struct resource data_resource = { .name = "Kernel data", }; 80 81unsigned long memory_start, memory_end; 82 83static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE], 84 struct sh_machine_vector** mvp, 85 unsigned long *mv_io_base) 86{ 87 char c = ' ', *to = command_line, *from = COMMAND_LINE; 88 int len = 0; 89 90 /* Save unparsed command line copy for /proc/cmdline */ 91 memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 92 boot_command_line[COMMAND_LINE_SIZE-1] = '\0'; 93 94 memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START; 95 memory_end = memory_start + __MEMORY_SIZE; 96 97 for (;;) { 98 if (c == ' ' && !memcmp(from, "mem=", 4)) { 99 if (to != command_line) 100 to--; 101 { 102 unsigned long mem_size; 103 104 mem_size = memparse(from+4, &from); 105 memory_end = memory_start + mem_size; 106 } 107 } 108 109 if (c == ' ' && !memcmp(from, "sh_mv=", 6)) { 110 char* mv_end; 111 char* mv_comma; 112 int mv_len; 113 if (to != command_line) 114 to--; 115 from += 6; 116 mv_end = strchr(from, ' '); 117 if (mv_end == NULL) 118 mv_end = from + strlen(from); 119 120 mv_comma = strchr(from, ','); 121 if ((mv_comma != NULL) && (mv_comma < mv_end)) { 122 int ints[3]; 123 get_options(mv_comma+1, ARRAY_SIZE(ints), ints); 124 *mv_io_base = ints[1]; 125 mv_len = mv_comma - from; 126 } else { 127 mv_len = mv_end - from; 128 } 129 if (mv_len > (MV_NAME_SIZE-1)) 130 mv_len = MV_NAME_SIZE-1; 131 memcpy(mv_name, from, mv_len); 132 mv_name[mv_len] = '\0'; 133 from = mv_end; 134 135 *mvp = get_mv_byname(mv_name); 136 } 137 138 c = *(from++); 139 if (!c) 140 break; 141 if (COMMAND_LINE_SIZE <= ++len) 142 break; 143 *(to++) = c; 144 } 145 *to = '\0'; 146 *cmdline_p = command_line; 147} 148 149static int __init sh_mv_setup(char **cmdline_p) 150{ 151#ifdef CONFIG_SH_UNKNOWN 152 extern struct sh_machine_vector mv_unknown; 153#endif 154 struct sh_machine_vector *mv = NULL; 155 char mv_name[MV_NAME_SIZE] = ""; 156 unsigned long mv_io_base = 0; 157 158 parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base); 159 160#ifdef CONFIG_SH_UNKNOWN 161 if (mv == NULL) { 162 mv = &mv_unknown; 163 if (*mv_name != '\0') { 164 printk("Warning: Unsupported machine %s, using unknown\n", 165 mv_name); 166 } 167 } 168 sh_mv = *mv; 169#endif 170 171 /* 172 * Manually walk the vec, fill in anything that the board hasn't yet 173 * by hand, wrapping to the generic implementation. 174 */ 175#define mv_set(elem) do { \ 176 if (!sh_mv.mv_##elem) \ 177 sh_mv.mv_##elem = generic_##elem; \ 178} while (0) 179 180 mv_set(inb); mv_set(inw); mv_set(inl); 181 mv_set(outb); mv_set(outw); mv_set(outl); 182 183 mv_set(inb_p); mv_set(inw_p); mv_set(inl_p); 184 mv_set(outb_p); mv_set(outw_p); mv_set(outl_p); 185 186 mv_set(insb); mv_set(insw); mv_set(insl); 187 mv_set(outsb); mv_set(outsw); mv_set(outsl); 188 189 mv_set(readb); mv_set(readw); mv_set(readl); 190 mv_set(writeb); mv_set(writew); mv_set(writel); 191 192 mv_set(ioport_map); 193 mv_set(ioport_unmap); 194 mv_set(irq_demux); 195 196#ifdef CONFIG_SH_UNKNOWN 197 __set_io_port_base(mv_io_base); 198#endif 199 200 if (!sh_mv.mv_nr_irqs) 201 sh_mv.mv_nr_irqs = NR_IRQS; 202 203 return 0; 204} 205 206/* 207 * Register fully available low RAM pages with the bootmem allocator. 208 */ 209static void __init register_bootmem_low_pages(void) 210{ 211 unsigned long curr_pfn, last_pfn, pages; 212 213 /* 214 * We are rounding up the start address of usable memory: 215 */ 216 curr_pfn = PFN_UP(__MEMORY_START); 217 218 /* 219 * ... and at the end of the usable range downwards: 220 */ 221 last_pfn = PFN_DOWN(__pa(memory_end)); 222 223 if (last_pfn > max_low_pfn) 224 last_pfn = max_low_pfn; 225 226 pages = last_pfn - curr_pfn; 227 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages)); 228} 229 230void __init setup_bootmem_allocator(unsigned long start_pfn) 231{ 232 unsigned long bootmap_size; 233 234 /* 235 * Find a proper area for the bootmem bitmap. After this 236 * bootstrap step all allocations (until the page allocator 237 * is intact) must be done via bootmem_alloc(). 238 */ 239 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn, 240 min_low_pfn, max_low_pfn); 241 242 register_bootmem_low_pages(); 243 244 node_set_online(0); 245 246 /* 247 * Reserve the kernel text and 248 * Reserve the bootmem bitmap. We do this in two steps (first step 249 * was init_bootmem()), because this catches the (definitely buggy) 250 * case of us accidentally initializing the bootmem allocator with 251 * an invalid RAM area. 252 */ 253 reserve_bootmem(__MEMORY_START+PAGE_SIZE, 254 (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START); 255 256 /* 257 * reserve physical page 0 - it's a special BIOS page on many boxes, 258 * enabling clean reboots, SMP operation, laptop functions. 259 */ 260 reserve_bootmem(__MEMORY_START, PAGE_SIZE); 261 262#ifdef CONFIG_BLK_DEV_INITRD 263 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); 264 if (&__rd_start != &__rd_end) { 265 LOADER_TYPE = 1; 266 INITRD_START = PHYSADDR((unsigned long)&__rd_start) - 267 __MEMORY_START; 268 INITRD_SIZE = (unsigned long)&__rd_end - 269 (unsigned long)&__rd_start; 270 } 271 272 if (LOADER_TYPE && INITRD_START) { 273 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) { 274 reserve_bootmem(INITRD_START + __MEMORY_START, 275 INITRD_SIZE); 276 initrd_start = INITRD_START + PAGE_OFFSET + 277 __MEMORY_START; 278 initrd_end = initrd_start + INITRD_SIZE; 279 } else { 280 printk("initrd extends beyond end of memory " 281 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 282 INITRD_START + INITRD_SIZE, 283 max_low_pfn << PAGE_SHIFT); 284 initrd_start = 0; 285 } 286 } 287#endif 288#ifdef CONFIG_KEXEC 289 if (crashk_res.start != crashk_res.end) 290 reserve_bootmem(crashk_res.start, 291 crashk_res.end - crashk_res.start + 1); 292#endif 293} 294 295#ifndef CONFIG_NEED_MULTIPLE_NODES 296static void __init setup_memory(void) 297{ 298 unsigned long start_pfn; 299 300 /* 301 * Partially used pages are not usable - thus 302 * we are rounding upwards: 303 */ 304 start_pfn = PFN_UP(__pa(_end)); 305 setup_bootmem_allocator(start_pfn); 306} 307#else 308extern void __init setup_memory(void); 309#endif 310 311void __init setup_arch(char **cmdline_p) 312{ 313 enable_mmu(); 314 315#ifdef CONFIG_CMDLINE_BOOL 316 strcpy(COMMAND_LINE, CONFIG_CMDLINE); 317#endif 318 319 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 320 321#ifdef CONFIG_BLK_DEV_RAM 322 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 323 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 324 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 325#endif 326 327 if (!MOUNT_ROOT_RDONLY) 328 root_mountflags &= ~MS_RDONLY; 329 init_mm.start_code = (unsigned long) _text; 330 init_mm.end_code = (unsigned long) _etext; 331 init_mm.end_data = (unsigned long) _edata; 332 init_mm.brk = (unsigned long) _end; 333 334 code_resource.start = virt_to_phys(_text); 335 code_resource.end = virt_to_phys(_etext)-1; 336 data_resource.start = virt_to_phys(_etext); 337 data_resource.end = virt_to_phys(_edata)-1; 338 339 parse_early_param(); 340 341 sh_mv_setup(cmdline_p); 342 343 /* 344 * Find the highest page frame number we have available 345 */ 346 max_pfn = PFN_DOWN(__pa(memory_end)); 347 348 /* 349 * Determine low and high memory ranges: 350 */ 351 max_low_pfn = max_pfn; 352 min_low_pfn = __MEMORY_START >> PAGE_SHIFT; 353 354 nodes_clear(node_online_map); 355 setup_memory(); 356 paging_init(); 357 sparse_init(); 358 359#ifdef CONFIG_DUMMY_CONSOLE 360 conswitchp = &dummy_con; 361#endif 362 363 /* Perform the machine specific initialisation */ 364 if (likely(sh_mv.mv_setup)) 365 sh_mv.mv_setup(cmdline_p); 366} 367 368struct sh_machine_vector* __init get_mv_byname(const char* name) 369{ 370 extern long __machvec_start, __machvec_end; 371 struct sh_machine_vector *all_vecs = 372 (struct sh_machine_vector *)&__machvec_start; 373 374 int i, n = ((unsigned long)&__machvec_end 375 - (unsigned long)&__machvec_start)/ 376 sizeof(struct sh_machine_vector); 377 378 for (i = 0; i < n; ++i) { 379 struct sh_machine_vector *mv = &all_vecs[i]; 380 if (mv == NULL) 381 continue; 382 if (strcasecmp(name, get_system_type()) == 0) { 383 return mv; 384 } 385 } 386 return NULL; 387} 388 389static struct cpu cpu[NR_CPUS]; 390 391static int __init topology_init(void) 392{ 393 int cpu_id; 394 395 for_each_possible_cpu(cpu_id) 396 register_cpu(&cpu[cpu_id], cpu_id); 397 398 return 0; 399} 400 401subsys_initcall(topology_init); 402 403static const char *cpu_name[] = { 404 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619", 405 [CPU_SH7604] = "SH7604", [CPU_SH7300] = "SH7300", 406 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706", 407 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708", 408 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710", 409 [CPU_SH7712] = "SH7712", 410 [CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750", 411 [CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R", 412 [CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R", 413 [CPU_SH7760] = "SH7760", [CPU_SH73180] = "SH73180", 414 [CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1", 415 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501", 416 [CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780", 417 [CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343", 418 [CPU_SH7785] = "SH7785", [CPU_SH7722] = "SH7722", 419 [CPU_SH_NONE] = "Unknown" 420}; 421 422const char *get_cpu_subtype(struct sh_cpuinfo *c) 423{ 424 return cpu_name[c->type]; 425} 426 427#ifdef CONFIG_PROC_FS 428/* Symbolic CPU flags, keep in sync with asm/cpu-features.h */ 429static const char *cpu_flags[] = { 430 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", 431 "ptea", "llsc", "l2", "op32", NULL 432}; 433 434static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c) 435{ 436 unsigned long i; 437 438 seq_printf(m, "cpu flags\t:"); 439 440 if (!c->flags) { 441 seq_printf(m, " %s\n", cpu_flags[0]); 442 return; 443 } 444 445 for (i = 0; cpu_flags[i]; i++) 446 if ((c->flags & (1 << i))) 447 seq_printf(m, " %s", cpu_flags[i+1]); 448 449 seq_printf(m, "\n"); 450} 451 452static void show_cacheinfo(struct seq_file *m, const char *type, 453 struct cache_info info) 454{ 455 unsigned int cache_size; 456 457 cache_size = info.ways * info.sets * info.linesz; 458 459 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n", 460 type, cache_size >> 10, info.ways); 461} 462 463/* 464 * Get CPU information for use by the procfs. 465 */ 466static int show_cpuinfo(struct seq_file *m, void *v) 467{ 468 struct sh_cpuinfo *c = v; 469 unsigned int cpu = c - cpu_data; 470 471 if (!cpu_online(cpu)) 472 return 0; 473 474 if (cpu == 0) 475 seq_printf(m, "machine\t\t: %s\n", get_system_type()); 476 477 seq_printf(m, "processor\t: %d\n", cpu); 478 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine); 479 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c)); 480 481 show_cpuflags(m, c); 482 483 seq_printf(m, "cache type\t: "); 484 485 /* 486 * Check for what type of cache we have, we support both the 487 * unified cache on the SH-2 and SH-3, as well as the harvard 488 * style cache on the SH-4. 489 */ 490 if (c->icache.flags & SH_CACHE_COMBINED) { 491 seq_printf(m, "unified\n"); 492 show_cacheinfo(m, "cache", c->icache); 493 } else { 494 seq_printf(m, "split (harvard)\n"); 495 show_cacheinfo(m, "icache", c->icache); 496 show_cacheinfo(m, "dcache", c->dcache); 497 } 498 499 /* Optional secondary cache */ 500 if (c->flags & CPU_HAS_L2_CACHE) 501 show_cacheinfo(m, "scache", c->scache); 502 503 seq_printf(m, "bogomips\t: %lu.%02lu\n", 504 c->loops_per_jiffy/(500000/HZ), 505 (c->loops_per_jiffy/(5000/HZ)) % 100); 506 507 return 0; 508} 509 510static void *c_start(struct seq_file *m, loff_t *pos) 511{ 512 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 513} 514static void *c_next(struct seq_file *m, void *v, loff_t *pos) 515{ 516 ++*pos; 517 return c_start(m, pos); 518} 519static void c_stop(struct seq_file *m, void *v) 520{ 521} 522struct seq_operations cpuinfo_op = { 523 .start = c_start, 524 .next = c_next, 525 .stop = c_stop, 526 .show = show_cpuinfo, 527}; 528#endif /* CONFIG_PROC_FS */ 529