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/clk-provider.h> 17 #include <linux/of_fdt.h> 18 #include <linux/of_platform.h> 19 #include <linux/cache.h> 20 #include <asm/sections.h> 21 #include <asm/arcregs.h> 22 #include <asm/tlb.h> 23 #include <asm/setup.h> 24 #include <asm/page.h> 25 #include <asm/irq.h> 26 #include <asm/unwind.h> 27 #include <asm/clk.h> 28 #include <asm/mach_desc.h> 29 #include <asm/smp.h> 30 31 #define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x)) 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 void read_arc_build_cfg_regs(void) 44 { 45 struct bcr_perip uncached_space; 46 struct bcr_generic bcr; 47 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 48 FIX_PTR(cpu); 49 50 READ_BCR(AUX_IDENTITY, cpu->core); 51 READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa); 52 53 READ_BCR(ARC_REG_TIMERS_BCR, cpu->timers); 54 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE); 55 56 READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space); 57 cpu->uncached_base = uncached_space.start << 24; 58 59 READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy); 60 61 cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */ 62 cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */ 63 cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0; /* 1,3 */ 64 cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0; 65 cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */ 66 67 /* Note that we read the CCM BCRs independent of kernel config 68 * This is to catch the cases where user doesn't know that 69 * CCMs are present in hardware build 70 */ 71 { 72 struct bcr_iccm iccm; 73 struct bcr_dccm dccm; 74 struct bcr_dccm_base dccm_base; 75 unsigned int bcr_32bit_val; 76 77 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR); 78 if (bcr_32bit_val) { 79 iccm = *((struct bcr_iccm *)&bcr_32bit_val); 80 cpu->iccm.base_addr = iccm.base << 16; 81 cpu->iccm.sz = 0x2000 << (iccm.sz - 1); 82 } 83 84 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR); 85 if (bcr_32bit_val) { 86 dccm = *((struct bcr_dccm *)&bcr_32bit_val); 87 cpu->dccm.sz = 0x800 << (dccm.sz); 88 89 READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base); 90 cpu->dccm.base_addr = dccm_base.addr << 8; 91 } 92 } 93 94 READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem); 95 96 read_decode_mmu_bcr(); 97 read_decode_cache_bcr(); 98 99 { 100 struct bcr_fp_arcompact sp, dp; 101 struct bcr_bpu_arcompact bpu; 102 103 READ_BCR(ARC_REG_FP_BCR, sp); 104 READ_BCR(ARC_REG_DPFP_BCR, dp); 105 cpu->extn.fpu_sp = sp.ver ? 1 : 0; 106 cpu->extn.fpu_dp = dp.ver ? 1 : 0; 107 108 READ_BCR(ARC_REG_BPU_BCR, bpu); 109 cpu->bpu.ver = bpu.ver; 110 cpu->bpu.full = bpu.fam ? 1 : 0; 111 if (bpu.ent) { 112 cpu->bpu.num_cache = 256 << (bpu.ent - 1); 113 cpu->bpu.num_pred = 256 << (bpu.ent - 1); 114 } 115 } 116 117 READ_BCR(ARC_REG_AP_BCR, bcr); 118 cpu->extn.ap = bcr.ver ? 1 : 0; 119 120 READ_BCR(ARC_REG_SMART_BCR, bcr); 121 cpu->extn.smart = bcr.ver ? 1 : 0; 122 123 READ_BCR(ARC_REG_RTT_BCR, bcr); 124 cpu->extn.rtt = bcr.ver ? 1 : 0; 125 126 cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt; 127 } 128 129 static const struct cpuinfo_data arc_cpu_tbl[] = { 130 { {0x20, "ARC 600" }, 0x2F}, 131 { {0x30, "ARC 700" }, 0x33}, 132 { {0x34, "ARC 700 R4.10"}, 0x34}, 133 { {0x35, "ARC 700 R4.11"}, 0x35}, 134 { {0x00, NULL } } 135 }; 136 137 #define IS_AVAIL1(v, str) ((v) ? str : "") 138 #define IS_USED(cfg) (IS_ENABLED(cfg) ? "" : "(not used) ") 139 #define IS_AVAIL2(v, str, cfg) IS_AVAIL1(v, str), IS_AVAIL1(v, IS_USED(cfg)) 140 141 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len) 142 { 143 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id]; 144 struct bcr_identity *core = &cpu->core; 145 const struct cpuinfo_data *tbl; 146 char *isa_nm; 147 int i, be, atomic; 148 int n = 0; 149 150 FIX_PTR(cpu); 151 152 { 153 isa_nm = "ARCompact"; 154 be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN); 155 156 atomic = cpu->isa.atomic1; 157 if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */ 158 atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC); 159 } 160 161 n += scnprintf(buf + n, len - n, 162 "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n", 163 core->family, core->cpu_id, core->chip_id); 164 165 for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) { 166 if ((core->family >= tbl->info.id) && 167 (core->family <= tbl->up_range)) { 168 n += scnprintf(buf + n, len - n, 169 "processor [%d]\t: %s (%s ISA) %s\n", 170 cpu_id, tbl->info.str, isa_nm, 171 IS_AVAIL1(be, "[Big-Endian]")); 172 break; 173 } 174 } 175 176 if (tbl->info.id == 0) 177 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n"); 178 179 n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n", 180 (unsigned int)(arc_get_core_freq() / 1000000), 181 (unsigned int)(arc_get_core_freq() / 10000) % 100); 182 183 n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ", 184 IS_AVAIL1(cpu->timers.t0, "Timer0 "), 185 IS_AVAIL1(cpu->timers.t1, "Timer1 "), 186 IS_AVAIL2(cpu->timers.rtsc, "64-bit RTSC ", CONFIG_ARC_HAS_RTSC)); 187 188 n += i = scnprintf(buf + n, len - n, "%s%s", 189 IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC)); 190 191 if (i) 192 n += scnprintf(buf + n, len - n, "\n\t\t: "); 193 194 n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n", 195 IS_AVAIL1(cpu->extn_mpy.ver, "mpy "), 196 IS_AVAIL1(cpu->extn.norm, "norm "), 197 IS_AVAIL1(cpu->extn.barrel, "barrel-shift "), 198 IS_AVAIL1(cpu->extn.swap, "swap "), 199 IS_AVAIL1(cpu->extn.minmax, "minmax "), 200 IS_AVAIL1(cpu->extn.crc, "crc "), 201 IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE)); 202 203 if (cpu->bpu.ver) 204 n += scnprintf(buf + n, len - n, 205 "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n", 206 IS_AVAIL1(cpu->bpu.full, "full"), 207 IS_AVAIL1(!cpu->bpu.full, "partial"), 208 cpu->bpu.num_cache, cpu->bpu.num_pred); 209 210 return buf; 211 } 212 213 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len) 214 { 215 int n = 0; 216 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id]; 217 218 FIX_PTR(cpu); 219 220 n += scnprintf(buf + n, len - n, 221 "Vector Table\t: %#x\nUncached Base\t: %#x\n", 222 cpu->vec_base, cpu->uncached_base); 223 224 if (cpu->extn.fpu_sp || cpu->extn.fpu_dp) 225 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n", 226 IS_AVAIL1(cpu->extn.fpu_sp, "SP "), 227 IS_AVAIL1(cpu->extn.fpu_dp, "DP ")); 228 229 if (cpu->extn.debug) 230 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n", 231 IS_AVAIL1(cpu->extn.ap, "ActionPoint "), 232 IS_AVAIL1(cpu->extn.smart, "smaRT "), 233 IS_AVAIL1(cpu->extn.rtt, "RTT ")); 234 235 if (cpu->dccm.sz || cpu->iccm.sz) 236 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n", 237 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz), 238 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz)); 239 240 n += scnprintf(buf + n, len - n, 241 "OS ABI [v3]\t: no-legacy-syscalls\n"); 242 243 return buf; 244 } 245 246 static void arc_chk_core_config(void) 247 { 248 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 249 int fpu_enabled; 250 251 if (!cpu->timers.t0) 252 panic("Timer0 is not present!\n"); 253 254 if (!cpu->timers.t1) 255 panic("Timer1 is not present!\n"); 256 257 if (IS_ENABLED(CONFIG_ARC_HAS_RTSC) && !cpu->timers.rtsc) 258 panic("RTSC is not present\n"); 259 260 #ifdef CONFIG_ARC_HAS_DCCM 261 /* 262 * DCCM can be arbit placed in hardware. 263 * Make sure it's placement/sz matches what Linux is built with 264 */ 265 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr) 266 panic("Linux built with incorrect DCCM Base address\n"); 267 268 if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz) 269 panic("Linux built with incorrect DCCM Size\n"); 270 #endif 271 272 #ifdef CONFIG_ARC_HAS_ICCM 273 if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz) 274 panic("Linux built with incorrect ICCM Size\n"); 275 #endif 276 277 /* 278 * FP hardware/software config sanity 279 * -If hardware contains DPFP, kernel needs to save/restore FPU state 280 * -If not, it will crash trying to save/restore the non-existant regs 281 * 282 * (only DPDP checked since SP has no arch visible regs) 283 */ 284 fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE); 285 286 if (cpu->extn.fpu_dp && !fpu_enabled) 287 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n"); 288 else if (!cpu->extn.fpu_dp && fpu_enabled) 289 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n"); 290 } 291 292 /* 293 * Initialize and setup the processor core 294 * This is called by all the CPUs thus should not do special case stuff 295 * such as only for boot CPU etc 296 */ 297 298 void setup_processor(void) 299 { 300 char str[512]; 301 int cpu_id = smp_processor_id(); 302 303 read_arc_build_cfg_regs(); 304 arc_init_IRQ(); 305 306 printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str))); 307 308 arc_mmu_init(); 309 arc_cache_init(); 310 311 printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str))); 312 printk(arc_platform_smp_cpuinfo()); 313 314 arc_chk_core_config(); 315 } 316 317 static inline int is_kernel(unsigned long addr) 318 { 319 if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end) 320 return 1; 321 return 0; 322 } 323 324 void __init setup_arch(char **cmdline_p) 325 { 326 /* make sure that uboot passed pointer to cmdline/dtb is valid */ 327 if (uboot_tag && is_kernel((unsigned long)uboot_arg)) 328 panic("Invalid uboot arg\n"); 329 330 /* See if u-boot passed an external Device Tree blob */ 331 machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */ 332 if (!machine_desc) { 333 /* No, so try the embedded one */ 334 machine_desc = setup_machine_fdt(__dtb_start); 335 if (!machine_desc) 336 panic("Embedded DT invalid\n"); 337 338 /* 339 * If we are here, it is established that @uboot_arg didn't 340 * point to DT blob. Instead if u-boot says it is cmdline, 341 * Appent to embedded DT cmdline. 342 * setup_machine_fdt() would have populated @boot_command_line 343 */ 344 if (uboot_tag == 1) { 345 /* Ensure a whitespace between the 2 cmdlines */ 346 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 347 strlcat(boot_command_line, uboot_arg, 348 COMMAND_LINE_SIZE); 349 } 350 } 351 352 /* Save unparsed command line copy for /proc/cmdline */ 353 *cmdline_p = boot_command_line; 354 355 /* To force early parsing of things like mem=xxx */ 356 parse_early_param(); 357 358 /* Platform/board specific: e.g. early console registration */ 359 if (machine_desc->init_early) 360 machine_desc->init_early(); 361 362 setup_processor(); 363 smp_init_cpus(); 364 setup_arch_memory(); 365 366 /* copy flat DT out of .init and then unflatten it */ 367 unflatten_and_copy_device_tree(); 368 369 /* Can be issue if someone passes cmd line arg "ro" 370 * But that is unlikely so keeping it as it is 371 */ 372 root_mountflags &= ~MS_RDONLY; 373 374 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE) 375 conswitchp = &dummy_con; 376 #endif 377 378 arc_unwind_init(); 379 arc_unwind_setup(); 380 } 381 382 static int __init customize_machine(void) 383 { 384 of_clk_init(NULL); 385 /* 386 * Traverses flattened DeviceTree - registering platform devices 387 * (if any) complete with their resources 388 */ 389 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 390 391 if (machine_desc->init_machine) 392 machine_desc->init_machine(); 393 394 return 0; 395 } 396 arch_initcall(customize_machine); 397 398 static int __init init_late_machine(void) 399 { 400 if (machine_desc->init_late) 401 machine_desc->init_late(); 402 403 return 0; 404 } 405 late_initcall(init_late_machine); 406 /* 407 * Get CPU information for use by the procfs. 408 */ 409 410 #define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c))) 411 #define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p)) 412 413 static int show_cpuinfo(struct seq_file *m, void *v) 414 { 415 char *str; 416 int cpu_id = ptr_to_cpu(v); 417 418 if (!cpu_online(cpu_id)) { 419 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id); 420 goto done; 421 } 422 423 str = (char *)__get_free_page(GFP_TEMPORARY); 424 if (!str) 425 goto done; 426 427 seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE)); 428 429 seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n", 430 loops_per_jiffy / (500000 / HZ), 431 (loops_per_jiffy / (5000 / HZ)) % 100); 432 433 seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE)); 434 seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE)); 435 seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE)); 436 seq_printf(m, arc_platform_smp_cpuinfo()); 437 438 free_page((unsigned long)str); 439 done: 440 seq_printf(m, "\n"); 441 442 return 0; 443 } 444 445 static void *c_start(struct seq_file *m, loff_t *pos) 446 { 447 /* 448 * Callback returns cpu-id to iterator for show routine, NULL to stop. 449 * However since NULL is also a valid cpu-id (0), we use a round-about 450 * way to pass it w/o having to kmalloc/free a 2 byte string. 451 * Encode cpu-id as 0xFFcccc, which is decoded by show routine. 452 */ 453 return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL; 454 } 455 456 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 457 { 458 ++*pos; 459 return c_start(m, pos); 460 } 461 462 static void c_stop(struct seq_file *m, void *v) 463 { 464 } 465 466 const struct seq_operations cpuinfo_op = { 467 .start = c_start, 468 .next = c_next, 469 .stop = c_stop, 470 .show = show_cpuinfo 471 }; 472 473 static DEFINE_PER_CPU(struct cpu, cpu_topology); 474 475 static int __init topology_init(void) 476 { 477 int cpu; 478 479 for_each_present_cpu(cpu) 480 register_cpu(&per_cpu(cpu_topology, cpu), cpu); 481 482 return 0; 483 } 484 485 subsys_initcall(topology_init); 486