1 /* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #include <linux/seq_file.h> 10 #include <linux/fs.h> 11 #include <linux/delay.h> 12 #include <linux/root_dev.h> 13 #include <linux/console.h> 14 #include <linux/module.h> 15 #include <linux/cpu.h> 16 #include <linux/of_fdt.h> 17 #include <linux/of.h> 18 #include <linux/cache.h> 19 #include <asm/sections.h> 20 #include <asm/arcregs.h> 21 #include <asm/tlb.h> 22 #include <asm/setup.h> 23 #include <asm/page.h> 24 #include <asm/irq.h> 25 #include <asm/unwind.h> 26 #include <asm/mach_desc.h> 27 #include <asm/smp.h> 28 29 #define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x)) 30 31 unsigned int intr_to_DE_cnt; 32 33 /* Part of U-boot ABI: see head.S */ 34 int __initdata uboot_tag; 35 char __initdata *uboot_arg; 36 37 const struct machine_desc *machine_desc; 38 39 struct task_struct *_current_task[NR_CPUS]; /* For stack switching */ 40 41 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS]; 42 43 static const struct id_to_str arc_cpu_rel[] = { 44 #ifdef CONFIG_ISA_ARCOMPACT 45 { 0x34, "R4.10"}, 46 { 0x35, "R4.11"}, 47 #else 48 { 0x51, "R2.0" }, 49 { 0x52, "R2.1" }, 50 { 0x53, "R3.0" }, 51 #endif 52 { 0x00, NULL } 53 }; 54 55 static const struct id_to_str arc_cpu_nm[] = { 56 #ifdef CONFIG_ISA_ARCOMPACT 57 { 0x20, "ARC 600" }, 58 { 0x30, "ARC 770" }, /* 750 identified seperately */ 59 #else 60 { 0x40, "ARC EM" }, 61 { 0x50, "ARC HS38" }, 62 #endif 63 { 0x00, "Unknown" } 64 }; 65 read_decode_ccm_bcr(struct cpuinfo_arc * cpu)66 static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu) 67 { 68 if (is_isa_arcompact()) { 69 struct bcr_iccm_arcompact iccm; 70 struct bcr_dccm_arcompact dccm; 71 72 READ_BCR(ARC_REG_ICCM_BUILD, iccm); 73 if (iccm.ver) { 74 cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */ 75 cpu->iccm.base_addr = iccm.base << 16; 76 } 77 78 READ_BCR(ARC_REG_DCCM_BUILD, dccm); 79 if (dccm.ver) { 80 unsigned long base; 81 cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */ 82 83 base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD); 84 cpu->dccm.base_addr = base & ~0xF; 85 } 86 } else { 87 struct bcr_iccm_arcv2 iccm; 88 struct bcr_dccm_arcv2 dccm; 89 unsigned long region; 90 91 READ_BCR(ARC_REG_ICCM_BUILD, iccm); 92 if (iccm.ver) { 93 cpu->iccm.sz = 256 << iccm.sz00; /* 512B to 16M */ 94 if (iccm.sz00 == 0xF && iccm.sz01 > 0) 95 cpu->iccm.sz <<= iccm.sz01; 96 97 region = read_aux_reg(ARC_REG_AUX_ICCM); 98 cpu->iccm.base_addr = region & 0xF0000000; 99 } 100 101 READ_BCR(ARC_REG_DCCM_BUILD, dccm); 102 if (dccm.ver) { 103 cpu->dccm.sz = 256 << dccm.sz0; 104 if (dccm.sz0 == 0xF && dccm.sz1 > 0) 105 cpu->dccm.sz <<= dccm.sz1; 106 107 region = read_aux_reg(ARC_REG_AUX_DCCM); 108 cpu->dccm.base_addr = region & 0xF0000000; 109 } 110 } 111 } 112 read_arc_build_cfg_regs(void)113 static void read_arc_build_cfg_regs(void) 114 { 115 struct bcr_timer timer; 116 struct bcr_generic bcr; 117 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 118 const struct id_to_str *tbl; 119 120 FIX_PTR(cpu); 121 122 READ_BCR(AUX_IDENTITY, cpu->core); 123 READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa); 124 125 for (tbl = &arc_cpu_rel[0]; tbl->id != 0; tbl++) { 126 if (cpu->core.family == tbl->id) { 127 cpu->details = tbl->str; 128 break; 129 } 130 } 131 132 for (tbl = &arc_cpu_nm[0]; tbl->id != 0; tbl++) { 133 if ((cpu->core.family & 0xF0) == tbl->id) 134 break; 135 } 136 cpu->name = tbl->str; 137 138 READ_BCR(ARC_REG_TIMERS_BCR, timer); 139 cpu->extn.timer0 = timer.t0; 140 cpu->extn.timer1 = timer.t1; 141 cpu->extn.rtc = timer.rtc; 142 143 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE); 144 145 READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy); 146 147 cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */ 148 cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */ 149 cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0; /* 1,3 */ 150 cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0; 151 cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */ 152 cpu->extn.swape = (cpu->core.family >= 0x34) ? 1 : 153 IS_ENABLED(CONFIG_ARC_HAS_SWAPE); 154 155 READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem); 156 157 /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */ 158 read_decode_ccm_bcr(cpu); 159 160 read_decode_mmu_bcr(); 161 read_decode_cache_bcr(); 162 163 if (is_isa_arcompact()) { 164 struct bcr_fp_arcompact sp, dp; 165 struct bcr_bpu_arcompact bpu; 166 167 READ_BCR(ARC_REG_FP_BCR, sp); 168 READ_BCR(ARC_REG_DPFP_BCR, dp); 169 cpu->extn.fpu_sp = sp.ver ? 1 : 0; 170 cpu->extn.fpu_dp = dp.ver ? 1 : 0; 171 172 READ_BCR(ARC_REG_BPU_BCR, bpu); 173 cpu->bpu.ver = bpu.ver; 174 cpu->bpu.full = bpu.fam ? 1 : 0; 175 if (bpu.ent) { 176 cpu->bpu.num_cache = 256 << (bpu.ent - 1); 177 cpu->bpu.num_pred = 256 << (bpu.ent - 1); 178 } 179 } else { 180 struct bcr_fp_arcv2 spdp; 181 struct bcr_bpu_arcv2 bpu; 182 183 READ_BCR(ARC_REG_FP_V2_BCR, spdp); 184 cpu->extn.fpu_sp = spdp.sp ? 1 : 0; 185 cpu->extn.fpu_dp = spdp.dp ? 1 : 0; 186 187 READ_BCR(ARC_REG_BPU_BCR, bpu); 188 cpu->bpu.ver = bpu.ver; 189 cpu->bpu.full = bpu.ft; 190 cpu->bpu.num_cache = 256 << bpu.bce; 191 cpu->bpu.num_pred = 2048 << bpu.pte; 192 } 193 194 READ_BCR(ARC_REG_AP_BCR, bcr); 195 cpu->extn.ap = bcr.ver ? 1 : 0; 196 197 READ_BCR(ARC_REG_SMART_BCR, bcr); 198 cpu->extn.smart = bcr.ver ? 1 : 0; 199 200 READ_BCR(ARC_REG_RTT_BCR, bcr); 201 cpu->extn.rtt = bcr.ver ? 1 : 0; 202 203 cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt; 204 205 /* some hacks for lack of feature BCR info in old ARC700 cores */ 206 if (is_isa_arcompact()) { 207 if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */ 208 cpu->isa.atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC); 209 else 210 cpu->isa.atomic = cpu->isa.atomic1; 211 212 cpu->isa.be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN); 213 214 /* there's no direct way to distinguish 750 vs. 770 */ 215 if (unlikely(cpu->core.family < 0x34 || cpu->mmu.ver < 3)) 216 cpu->name = "ARC750"; 217 } 218 } 219 arc_cpu_mumbojumbo(int cpu_id,char * buf,int len)220 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len) 221 { 222 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id]; 223 struct bcr_identity *core = &cpu->core; 224 int i, n = 0; 225 226 FIX_PTR(cpu); 227 228 n += scnprintf(buf + n, len - n, 229 "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n", 230 core->family, core->cpu_id, core->chip_id); 231 232 n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s\n", 233 cpu_id, cpu->name, cpu->details, 234 is_isa_arcompact() ? "ARCompact" : "ARCv2", 235 IS_AVAIL1(cpu->isa.be, "[Big-Endian]")); 236 237 n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ", 238 IS_AVAIL1(cpu->extn.timer0, "Timer0 "), 239 IS_AVAIL1(cpu->extn.timer1, "Timer1 "), 240 IS_AVAIL2(cpu->extn.rtc, "Local-64-bit-Ctr ", 241 CONFIG_ARC_HAS_RTC)); 242 243 n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s", 244 IS_AVAIL2(cpu->isa.atomic, "atomic ", CONFIG_ARC_HAS_LLSC), 245 IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64), 246 IS_AVAIL1(cpu->isa.unalign, "unalign (not used)")); 247 248 if (i) 249 n += scnprintf(buf + n, len - n, "\n\t\t: "); 250 251 if (cpu->extn_mpy.ver) { 252 if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */ 253 n += scnprintf(buf + n, len - n, "mpy "); 254 } else { 255 int opt = 2; /* stock MPY/MPYH */ 256 257 if (cpu->extn_mpy.dsp) /* OPT 7-9 */ 258 opt = cpu->extn_mpy.dsp + 6; 259 260 n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt); 261 } 262 } 263 264 n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n", 265 IS_AVAIL1(cpu->isa.div_rem, "div_rem "), 266 IS_AVAIL1(cpu->extn.norm, "norm "), 267 IS_AVAIL1(cpu->extn.barrel, "barrel-shift "), 268 IS_AVAIL1(cpu->extn.swap, "swap "), 269 IS_AVAIL1(cpu->extn.minmax, "minmax "), 270 IS_AVAIL1(cpu->extn.crc, "crc "), 271 IS_AVAIL2(cpu->extn.swape, "swape", CONFIG_ARC_HAS_SWAPE)); 272 273 if (cpu->bpu.ver) 274 n += scnprintf(buf + n, len - n, 275 "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n", 276 IS_AVAIL1(cpu->bpu.full, "full"), 277 IS_AVAIL1(!cpu->bpu.full, "partial"), 278 cpu->bpu.num_cache, cpu->bpu.num_pred); 279 280 return buf; 281 } 282 arc_extn_mumbojumbo(int cpu_id,char * buf,int len)283 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len) 284 { 285 int n = 0; 286 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id]; 287 288 FIX_PTR(cpu); 289 290 n += scnprintf(buf + n, len - n, "Vector Table\t: %#x\n", cpu->vec_base); 291 292 if (cpu->extn.fpu_sp || cpu->extn.fpu_dp) 293 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n", 294 IS_AVAIL1(cpu->extn.fpu_sp, "SP "), 295 IS_AVAIL1(cpu->extn.fpu_dp, "DP ")); 296 297 if (cpu->extn.debug) 298 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n", 299 IS_AVAIL1(cpu->extn.ap, "ActionPoint "), 300 IS_AVAIL1(cpu->extn.smart, "smaRT "), 301 IS_AVAIL1(cpu->extn.rtt, "RTT ")); 302 303 if (cpu->dccm.sz || cpu->iccm.sz) 304 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n", 305 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz), 306 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz)); 307 308 n += scnprintf(buf + n, len - n, "OS ABI [v%d]\t: %s\n", 309 EF_ARC_OSABI_CURRENT >> 8, 310 EF_ARC_OSABI_CURRENT == EF_ARC_OSABI_V3 ? 311 "no-legacy-syscalls" : "64-bit data any register aligned"); 312 313 return buf; 314 } 315 arc_chk_core_config(void)316 static void arc_chk_core_config(void) 317 { 318 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 319 int fpu_enabled; 320 321 if (!cpu->extn.timer0) 322 panic("Timer0 is not present!\n"); 323 324 if (!cpu->extn.timer1) 325 panic("Timer1 is not present!\n"); 326 327 #ifdef CONFIG_ARC_HAS_DCCM 328 /* 329 * DCCM can be arbit placed in hardware. 330 * Make sure it's placement/sz matches what Linux is built with 331 */ 332 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr) 333 panic("Linux built with incorrect DCCM Base address\n"); 334 335 if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz) 336 panic("Linux built with incorrect DCCM Size\n"); 337 #endif 338 339 #ifdef CONFIG_ARC_HAS_ICCM 340 if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz) 341 panic("Linux built with incorrect ICCM Size\n"); 342 #endif 343 344 /* 345 * FP hardware/software config sanity 346 * -If hardware contains DPFP, kernel needs to save/restore FPU state 347 * -If not, it will crash trying to save/restore the non-existant regs 348 * 349 * (only DPDP checked since SP has no arch visible regs) 350 */ 351 fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE); 352 353 if (cpu->extn.fpu_dp && !fpu_enabled) 354 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n"); 355 else if (!cpu->extn.fpu_dp && fpu_enabled) 356 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n"); 357 } 358 359 /* 360 * Initialize and setup the processor core 361 * This is called by all the CPUs thus should not do special case stuff 362 * such as only for boot CPU etc 363 */ 364 setup_processor(void)365 void setup_processor(void) 366 { 367 char str[512]; 368 int cpu_id = smp_processor_id(); 369 370 read_arc_build_cfg_regs(); 371 arc_init_IRQ(); 372 373 printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str))); 374 375 arc_mmu_init(); 376 arc_cache_init(); 377 378 printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str))); 379 printk(arc_platform_smp_cpuinfo()); 380 381 arc_chk_core_config(); 382 } 383 is_kernel(unsigned long addr)384 static inline int is_kernel(unsigned long addr) 385 { 386 if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end) 387 return 1; 388 return 0; 389 } 390 setup_arch(char ** cmdline_p)391 void __init setup_arch(char **cmdline_p) 392 { 393 #ifdef CONFIG_ARC_UBOOT_SUPPORT 394 /* make sure that uboot passed pointer to cmdline/dtb is valid */ 395 if (uboot_tag && is_kernel((unsigned long)uboot_arg)) 396 panic("Invalid uboot arg\n"); 397 398 /* See if u-boot passed an external Device Tree blob */ 399 machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */ 400 if (!machine_desc) 401 #endif 402 { 403 /* No, so try the embedded one */ 404 machine_desc = setup_machine_fdt(__dtb_start); 405 if (!machine_desc) 406 panic("Embedded DT invalid\n"); 407 408 /* 409 * If we are here, it is established that @uboot_arg didn't 410 * point to DT blob. Instead if u-boot says it is cmdline, 411 * append to embedded DT cmdline. 412 * setup_machine_fdt() would have populated @boot_command_line 413 */ 414 if (uboot_tag == 1) { 415 /* Ensure a whitespace between the 2 cmdlines */ 416 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 417 strlcat(boot_command_line, uboot_arg, 418 COMMAND_LINE_SIZE); 419 } 420 } 421 422 /* Save unparsed command line copy for /proc/cmdline */ 423 *cmdline_p = boot_command_line; 424 425 /* To force early parsing of things like mem=xxx */ 426 parse_early_param(); 427 428 /* Platform/board specific: e.g. early console registration */ 429 if (machine_desc->init_early) 430 machine_desc->init_early(); 431 432 smp_init_cpus(); 433 434 setup_processor(); 435 setup_arch_memory(); 436 437 /* copy flat DT out of .init and then unflatten it */ 438 unflatten_and_copy_device_tree(); 439 440 /* Can be issue if someone passes cmd line arg "ro" 441 * But that is unlikely so keeping it as it is 442 */ 443 root_mountflags &= ~MS_RDONLY; 444 445 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE) 446 conswitchp = &dummy_con; 447 #endif 448 449 arc_unwind_init(); 450 } 451 customize_machine(void)452 static int __init customize_machine(void) 453 { 454 if (machine_desc->init_machine) 455 machine_desc->init_machine(); 456 457 return 0; 458 } 459 arch_initcall(customize_machine); 460 init_late_machine(void)461 static int __init init_late_machine(void) 462 { 463 if (machine_desc->init_late) 464 machine_desc->init_late(); 465 466 return 0; 467 } 468 late_initcall(init_late_machine); 469 /* 470 * Get CPU information for use by the procfs. 471 */ 472 473 #define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c))) 474 #define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p)) 475 show_cpuinfo(struct seq_file * m,void * v)476 static int show_cpuinfo(struct seq_file *m, void *v) 477 { 478 char *str; 479 int cpu_id = ptr_to_cpu(v); 480 struct device_node *core_clk = of_find_node_by_name(NULL, "core_clk"); 481 u32 freq = 0; 482 483 if (!cpu_online(cpu_id)) { 484 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id); 485 goto done; 486 } 487 488 str = (char *)__get_free_page(GFP_TEMPORARY); 489 if (!str) 490 goto done; 491 492 seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE)); 493 494 of_property_read_u32(core_clk, "clock-frequency", &freq); 495 if (freq) 496 seq_printf(m, "CPU speed\t: %u.%02u Mhz\n", 497 freq / 1000000, (freq / 10000) % 100); 498 499 seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n", 500 loops_per_jiffy / (500000 / HZ), 501 (loops_per_jiffy / (5000 / HZ)) % 100); 502 503 seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE)); 504 seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE)); 505 seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE)); 506 seq_printf(m, arc_platform_smp_cpuinfo()); 507 508 free_page((unsigned long)str); 509 done: 510 seq_printf(m, "\n"); 511 512 return 0; 513 } 514 c_start(struct seq_file * m,loff_t * pos)515 static void *c_start(struct seq_file *m, loff_t *pos) 516 { 517 /* 518 * Callback returns cpu-id to iterator for show routine, NULL to stop. 519 * However since NULL is also a valid cpu-id (0), we use a round-about 520 * way to pass it w/o having to kmalloc/free a 2 byte string. 521 * Encode cpu-id as 0xFFcccc, which is decoded by show routine. 522 */ 523 return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL; 524 } 525 c_next(struct seq_file * m,void * v,loff_t * pos)526 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 527 { 528 ++*pos; 529 return c_start(m, pos); 530 } 531 c_stop(struct seq_file * m,void * v)532 static void c_stop(struct seq_file *m, void *v) 533 { 534 } 535 536 const struct seq_operations cpuinfo_op = { 537 .start = c_start, 538 .next = c_next, 539 .stop = c_stop, 540 .show = show_cpuinfo 541 }; 542 543 static DEFINE_PER_CPU(struct cpu, cpu_topology); 544 topology_init(void)545 static int __init topology_init(void) 546 { 547 int cpu; 548 549 for_each_present_cpu(cpu) 550 register_cpu(&per_cpu(cpu_topology, cpu), cpu); 551 552 return 0; 553 } 554 555 subsys_initcall(topology_init); 556