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 - 2010 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 <linux/module.h> 25#include <linux/smp.h> 26#include <linux/err.h> 27#include <linux/debugfs.h> 28#include <linux/crash_dump.h> 29#include <linux/mmzone.h> 30#include <linux/clk.h> 31#include <linux/delay.h> 32#include <linux/platform_device.h> 33#include <linux/memblock.h> 34#include <asm/uaccess.h> 35#include <asm/io.h> 36#include <asm/page.h> 37#include <asm/elf.h> 38#include <asm/sections.h> 39#include <asm/irq.h> 40#include <asm/setup.h> 41#include <asm/clock.h> 42#include <asm/smp.h> 43#include <asm/mmu_context.h> 44#include <asm/mmzone.h> 45 46/* 47 * Initialize loops_per_jiffy as 10000000 (1000MIPS). 48 * This value will be used at the very early stage of serial setup. 49 * The bigger value means no problem. 50 */ 51struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = { 52 [0] = { 53 .type = CPU_SH_NONE, 54 .family = CPU_FAMILY_UNKNOWN, 55 .loops_per_jiffy = 10000000, 56 }, 57}; 58EXPORT_SYMBOL(cpu_data); 59 60/* 61 * The machine vector. First entry in .machvec.init, or clobbered by 62 * sh_mv= on the command line, prior to .machvec.init teardown. 63 */ 64struct sh_machine_vector sh_mv = { .mv_name = "generic", }; 65EXPORT_SYMBOL(sh_mv); 66 67#ifdef CONFIG_VT 68struct screen_info screen_info; 69#endif 70 71extern int root_mountflags; 72 73#define RAMDISK_IMAGE_START_MASK 0x07FF 74#define RAMDISK_PROMPT_FLAG 0x8000 75#define RAMDISK_LOAD_FLAG 0x4000 76 77static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, }; 78 79static struct resource code_resource = { 80 .name = "Kernel code", 81 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 82}; 83 84static struct resource data_resource = { 85 .name = "Kernel data", 86 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 87}; 88 89static struct resource bss_resource = { 90 .name = "Kernel bss", 91 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 92}; 93 94unsigned long memory_start; 95EXPORT_SYMBOL(memory_start); 96unsigned long memory_end = 0; 97EXPORT_SYMBOL(memory_end); 98unsigned long memory_limit = 0; 99 100static struct resource mem_resources[MAX_NUMNODES]; 101 102int l1i_cache_shape, l1d_cache_shape, l2_cache_shape; 103 104static int __init early_parse_mem(char *p) 105{ 106 if (!p) 107 return 1; 108 109 memory_limit = PAGE_ALIGN(memparse(p, &p)); 110 111 pr_notice("Memory limited to %ldMB\n", memory_limit >> 20); 112 113 return 0; 114} 115early_param("mem", early_parse_mem); 116 117void __init check_for_initrd(void) 118{ 119#ifdef CONFIG_BLK_DEV_INITRD 120 unsigned long start, end; 121 122 /* 123 * Check for the rare cases where boot loaders adhere to the boot 124 * ABI. 125 */ 126 if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE) 127 goto disable; 128 129 start = INITRD_START + __MEMORY_START; 130 end = start + INITRD_SIZE; 131 132 if (unlikely(end <= start)) 133 goto disable; 134 if (unlikely(start & ~PAGE_MASK)) { 135 pr_err("initrd must be page aligned\n"); 136 goto disable; 137 } 138 139 if (unlikely(start < PAGE_OFFSET)) { 140 pr_err("initrd start < PAGE_OFFSET\n"); 141 goto disable; 142 } 143 144 if (unlikely(end > memblock_end_of_DRAM())) { 145 pr_err("initrd extends beyond end of memory " 146 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 147 end, (unsigned long)memblock_end_of_DRAM()); 148 goto disable; 149 } 150 151 /* 152 * If we got this far inspite of the boot loader's best efforts 153 * to the contrary, assume we actually have a valid initrd and 154 * fix up the root dev. 155 */ 156 ROOT_DEV = Root_RAM0; 157 158 /* 159 * Address sanitization 160 */ 161 initrd_start = (unsigned long)__va(__pa(start)); 162 initrd_end = initrd_start + INITRD_SIZE; 163 164 memblock_reserve(__pa(initrd_start), INITRD_SIZE); 165 166 return; 167 168disable: 169 pr_info("initrd disabled\n"); 170 initrd_start = initrd_end = 0; 171#endif 172} 173 174void __cpuinit calibrate_delay(void) 175{ 176 struct clk *clk = clk_get(NULL, "cpu_clk"); 177 178 if (IS_ERR(clk)) 179 panic("Need a sane CPU clock definition!"); 180 181 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; 182 183 printk(KERN_INFO "Calibrating delay loop (skipped)... " 184 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", 185 loops_per_jiffy/(500000/HZ), 186 (loops_per_jiffy/(5000/HZ)) % 100, 187 loops_per_jiffy); 188} 189 190void __init __add_active_range(unsigned int nid, unsigned long start_pfn, 191 unsigned long end_pfn) 192{ 193 struct resource *res = &mem_resources[nid]; 194 unsigned long start, end; 195 196 WARN_ON(res->name); /* max one active range per node for now */ 197 198 start = start_pfn << PAGE_SHIFT; 199 end = end_pfn << PAGE_SHIFT; 200 201 res->name = "System RAM"; 202 res->start = start; 203 res->end = end - 1; 204 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 205 206 if (request_resource(&iomem_resource, res)) { 207 pr_err("unable to request memory_resource 0x%lx 0x%lx\n", 208 start_pfn, end_pfn); 209 return; 210 } 211 212 /* 213 * We don't know which RAM region contains kernel data, 214 * so we try it repeatedly and let the resource manager 215 * test it. 216 */ 217 request_resource(res, &code_resource); 218 request_resource(res, &data_resource); 219 request_resource(res, &bss_resource); 220 221 /* 222 * Also make sure that there is a PMB mapping that covers this 223 * range before we attempt to activate it, to avoid reset by MMU. 224 * We can hit this path with NUMA or memory hot-add. 225 */ 226 pmb_bolt_mapping((unsigned long)__va(start), start, end - start, 227 PAGE_KERNEL); 228 229 add_active_range(nid, start_pfn, end_pfn); 230} 231 232void __init __weak plat_early_device_setup(void) 233{ 234} 235 236void __init setup_arch(char **cmdline_p) 237{ 238 enable_mmu(); 239 240 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV); 241 242 printk(KERN_NOTICE "Boot params:\n" 243 "... MOUNT_ROOT_RDONLY - %08lx\n" 244 "... RAMDISK_FLAGS - %08lx\n" 245 "... ORIG_ROOT_DEV - %08lx\n" 246 "... LOADER_TYPE - %08lx\n" 247 "... INITRD_START - %08lx\n" 248 "... INITRD_SIZE - %08lx\n", 249 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS, 250 ORIG_ROOT_DEV, LOADER_TYPE, 251 INITRD_START, INITRD_SIZE); 252 253#ifdef CONFIG_BLK_DEV_RAM 254 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK; 255 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0); 256 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0); 257#endif 258 259 if (!MOUNT_ROOT_RDONLY) 260 root_mountflags &= ~MS_RDONLY; 261 init_mm.start_code = (unsigned long) _text; 262 init_mm.end_code = (unsigned long) _etext; 263 init_mm.end_data = (unsigned long) _edata; 264 init_mm.brk = (unsigned long) _end; 265 266 code_resource.start = virt_to_phys(_text); 267 code_resource.end = virt_to_phys(_etext)-1; 268 data_resource.start = virt_to_phys(_etext); 269 data_resource.end = virt_to_phys(_edata)-1; 270 bss_resource.start = virt_to_phys(__bss_start); 271 bss_resource.end = virt_to_phys(_ebss)-1; 272 273#ifdef CONFIG_CMDLINE_OVERWRITE 274 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line)); 275#else 276 strlcpy(command_line, COMMAND_LINE, sizeof(command_line)); 277#ifdef CONFIG_CMDLINE_EXTEND 278 strlcat(command_line, " ", sizeof(command_line)); 279 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line)); 280#endif 281#endif 282 283 /* Save unparsed command line copy for /proc/cmdline */ 284 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 285 *cmdline_p = command_line; 286 287 parse_early_param(); 288 289 plat_early_device_setup(); 290 291 sh_mv_setup(); 292 293 /* Let earlyprintk output early console messages */ 294 early_platform_driver_probe("earlyprintk", 1, 1); 295 296 paging_init(); 297 298#ifdef CONFIG_DUMMY_CONSOLE 299 conswitchp = &dummy_con; 300#endif 301 302 /* Perform the machine specific initialisation */ 303 if (likely(sh_mv.mv_setup)) 304 sh_mv.mv_setup(cmdline_p); 305 306 plat_smp_setup(); 307} 308 309/* processor boot mode configuration */ 310int generic_mode_pins(void) 311{ 312 pr_warning("generic_mode_pins(): missing mode pin configuration\n"); 313 return 0; 314} 315 316int test_mode_pin(int pin) 317{ 318 return sh_mv.mv_mode_pins() & pin; 319} 320 321static const char *cpu_name[] = { 322 [CPU_SH7201] = "SH7201", 323 [CPU_SH7203] = "SH7203", [CPU_SH7263] = "SH7263", 324 [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619", 325 [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706", 326 [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708", 327 [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710", 328 [CPU_SH7712] = "SH7712", [CPU_SH7720] = "SH7720", 329 [CPU_SH7721] = "SH7721", [CPU_SH7729] = "SH7729", 330 [CPU_SH7750] = "SH7750", [CPU_SH7750S] = "SH7750S", 331 [CPU_SH7750R] = "SH7750R", [CPU_SH7751] = "SH7751", 332 [CPU_SH7751R] = "SH7751R", [CPU_SH7760] = "SH7760", 333 [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501", 334 [CPU_SH7763] = "SH7763", [CPU_SH7770] = "SH7770", 335 [CPU_SH7780] = "SH7780", [CPU_SH7781] = "SH7781", 336 [CPU_SH7343] = "SH7343", [CPU_SH7785] = "SH7785", 337 [CPU_SH7786] = "SH7786", [CPU_SH7757] = "SH7757", 338 [CPU_SH7722] = "SH7722", [CPU_SHX3] = "SH-X3", 339 [CPU_SH5_101] = "SH5-101", [CPU_SH5_103] = "SH5-103", 340 [CPU_MXG] = "MX-G", [CPU_SH7723] = "SH7723", 341 [CPU_SH7366] = "SH7366", [CPU_SH7724] = "SH7724", 342 [CPU_SH_NONE] = "Unknown" 343}; 344 345const char *get_cpu_subtype(struct sh_cpuinfo *c) 346{ 347 return cpu_name[c->type]; 348} 349EXPORT_SYMBOL(get_cpu_subtype); 350 351#ifdef CONFIG_PROC_FS 352/* Symbolic CPU flags, keep in sync with asm/cpu-features.h */ 353static const char *cpu_flags[] = { 354 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr", 355 "ptea", "llsc", "l2", "op32", "pteaex", NULL 356}; 357 358static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c) 359{ 360 unsigned long i; 361 362 seq_printf(m, "cpu flags\t:"); 363 364 if (!c->flags) { 365 seq_printf(m, " %s\n", cpu_flags[0]); 366 return; 367 } 368 369 for (i = 0; cpu_flags[i]; i++) 370 if ((c->flags & (1 << i))) 371 seq_printf(m, " %s", cpu_flags[i+1]); 372 373 seq_printf(m, "\n"); 374} 375 376static void show_cacheinfo(struct seq_file *m, const char *type, 377 struct cache_info info) 378{ 379 unsigned int cache_size; 380 381 cache_size = info.ways * info.sets * info.linesz; 382 383 seq_printf(m, "%s size\t: %2dKiB (%d-way)\n", 384 type, cache_size >> 10, info.ways); 385} 386 387/* 388 * Get CPU information for use by the procfs. 389 */ 390static int show_cpuinfo(struct seq_file *m, void *v) 391{ 392 struct sh_cpuinfo *c = v; 393 unsigned int cpu = c - cpu_data; 394 395 if (!cpu_online(cpu)) 396 return 0; 397 398 if (cpu == 0) 399 seq_printf(m, "machine\t\t: %s\n", get_system_type()); 400 else 401 seq_printf(m, "\n"); 402 403 seq_printf(m, "processor\t: %d\n", cpu); 404 seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine); 405 seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c)); 406 if (c->cut_major == -1) 407 seq_printf(m, "cut\t\t: unknown\n"); 408 else if (c->cut_minor == -1) 409 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major); 410 else 411 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor); 412 413 show_cpuflags(m, c); 414 415 seq_printf(m, "cache type\t: "); 416 417 /* 418 * Check for what type of cache we have, we support both the 419 * unified cache on the SH-2 and SH-3, as well as the harvard 420 * style cache on the SH-4. 421 */ 422 if (c->icache.flags & SH_CACHE_COMBINED) { 423 seq_printf(m, "unified\n"); 424 show_cacheinfo(m, "cache", c->icache); 425 } else { 426 seq_printf(m, "split (harvard)\n"); 427 show_cacheinfo(m, "icache", c->icache); 428 show_cacheinfo(m, "dcache", c->dcache); 429 } 430 431 /* Optional secondary cache */ 432 if (c->flags & CPU_HAS_L2_CACHE) 433 show_cacheinfo(m, "scache", c->scache); 434 435 seq_printf(m, "bogomips\t: %lu.%02lu\n", 436 c->loops_per_jiffy/(500000/HZ), 437 (c->loops_per_jiffy/(5000/HZ)) % 100); 438 439 return 0; 440} 441 442static void *c_start(struct seq_file *m, loff_t *pos) 443{ 444 return *pos < NR_CPUS ? cpu_data + *pos : NULL; 445} 446static void *c_next(struct seq_file *m, void *v, loff_t *pos) 447{ 448 ++*pos; 449 return c_start(m, pos); 450} 451static void c_stop(struct seq_file *m, void *v) 452{ 453} 454const struct seq_operations cpuinfo_op = { 455 .start = c_start, 456 .next = c_next, 457 .stop = c_stop, 458 .show = show_cpuinfo, 459}; 460#endif /* CONFIG_PROC_FS */ 461 462struct dentry *sh_debugfs_root; 463 464static int __init sh_debugfs_init(void) 465{ 466 sh_debugfs_root = debugfs_create_dir("sh", NULL); 467 if (!sh_debugfs_root) 468 return -ENOMEM; 469 if (IS_ERR(sh_debugfs_root)) 470 return PTR_ERR(sh_debugfs_root); 471 472 return 0; 473} 474arch_initcall(sh_debugfs_init); 475