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/cache.h> 18 #include <asm/sections.h> 19 #include <asm/arcregs.h> 20 #include <asm/tlb.h> 21 #include <asm/setup.h> 22 #include <asm/page.h> 23 #include <asm/irq.h> 24 #include <asm/unwind.h> 25 #include <asm/clk.h> 26 #include <asm/mach_desc.h> 27 28 #define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x)) 29 30 int running_on_hw = 1; /* vs. on ISS */ 31 32 /* Part of U-boot ABI: see head.S */ 33 int __initdata uboot_tag; 34 char __initdata *uboot_arg; 35 36 const struct machine_desc *machine_desc; 37 38 struct task_struct *_current_task[NR_CPUS]; /* For stack switching */ 39 40 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS]; 41 42 static void read_arc_build_cfg_regs(void) 43 { 44 struct bcr_perip uncached_space; 45 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 46 FIX_PTR(cpu); 47 48 READ_BCR(AUX_IDENTITY, cpu->core); 49 50 cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR); 51 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE); 52 53 READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space); 54 cpu->uncached_base = uncached_space.start << 24; 55 56 cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR); 57 cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR); 58 cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR); 59 cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR); 60 cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR); 61 READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul); 62 63 cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR); 64 cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR); 65 66 /* Note that we read the CCM BCRs independent of kernel config 67 * This is to catch the cases where user doesn't know that 68 * CCMs are present in hardware build 69 */ 70 { 71 struct bcr_iccm iccm; 72 struct bcr_dccm dccm; 73 struct bcr_dccm_base dccm_base; 74 unsigned int bcr_32bit_val; 75 76 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR); 77 if (bcr_32bit_val) { 78 iccm = *((struct bcr_iccm *)&bcr_32bit_val); 79 cpu->iccm.base_addr = iccm.base << 16; 80 cpu->iccm.sz = 0x2000 << (iccm.sz - 1); 81 } 82 83 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR); 84 if (bcr_32bit_val) { 85 dccm = *((struct bcr_dccm *)&bcr_32bit_val); 86 cpu->dccm.sz = 0x800 << (dccm.sz); 87 88 READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base); 89 cpu->dccm.base_addr = dccm_base.addr << 8; 90 } 91 } 92 93 READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem); 94 95 read_decode_mmu_bcr(); 96 read_decode_cache_bcr(); 97 98 READ_BCR(ARC_REG_FP_BCR, cpu->fp); 99 READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp); 100 } 101 102 static const struct cpuinfo_data arc_cpu_tbl[] = { 103 { {0x10, "ARCTangent A5"}, 0x1F}, 104 { {0x20, "ARC 600" }, 0x2F}, 105 { {0x30, "ARC 700" }, 0x33}, 106 { {0x34, "ARC 700 R4.10"}, 0x34}, 107 { {0x00, NULL } } 108 }; 109 110 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len) 111 { 112 int n = 0; 113 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id]; 114 struct bcr_identity *core = &cpu->core; 115 const struct cpuinfo_data *tbl; 116 int be = 0; 117 #ifdef CONFIG_CPU_BIG_ENDIAN 118 be = 1; 119 #endif 120 FIX_PTR(cpu); 121 122 n += scnprintf(buf + n, len - n, 123 "\nARC IDENTITY\t: Family [%#02x]" 124 " Cpu-id [%#02x] Chip-id [%#4x]\n", 125 core->family, core->cpu_id, 126 core->chip_id); 127 128 for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) { 129 if ((core->family >= tbl->info.id) && 130 (core->family <= tbl->up_range)) { 131 n += scnprintf(buf + n, len - n, 132 "processor\t: %s %s\n", 133 tbl->info.str, 134 be ? "[Big Endian]" : ""); 135 break; 136 } 137 } 138 139 if (tbl->info.id == 0) 140 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n"); 141 142 n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n", 143 (unsigned int)(arc_get_core_freq() / 1000000), 144 (unsigned int)(arc_get_core_freq() / 10000) % 100); 145 146 n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n", 147 (cpu->timers & 0x200) ? "TIMER1" : "", 148 (cpu->timers & 0x100) ? "TIMER0" : ""); 149 150 n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n", 151 cpu->vec_base); 152 153 n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n", 154 cpu->uncached_base); 155 156 return buf; 157 } 158 159 static const struct id_to_str mul_type_nm[] = { 160 { 0x0, "N/A"}, 161 { 0x1, "32x32 (spl Result Reg)" }, 162 { 0x2, "32x32 (ANY Result Reg)" } 163 }; 164 165 static const struct id_to_str mac_mul_nm[] = { 166 {0x0, "N/A"}, 167 {0x1, "N/A"}, 168 {0x2, "Dual 16 x 16"}, 169 {0x3, "N/A"}, 170 {0x4, "32x16"}, 171 {0x5, "N/A"}, 172 {0x6, "Dual 16x16 and 32x16"} 173 }; 174 175 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len) 176 { 177 int n = 0; 178 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id]; 179 180 FIX_PTR(cpu); 181 #define IS_AVAIL1(var, str) ((var) ? str : "") 182 #define IS_AVAIL2(var, str) ((var == 0x2) ? str : "") 183 #define IS_USED(cfg) (IS_ENABLED(cfg) ? "(in-use)" : "(not used)") 184 185 n += scnprintf(buf + n, len - n, 186 "Extn [700-Base]\t: %s %s %s %s %s %s\n", 187 IS_AVAIL2(cpu->extn.norm, "norm,"), 188 IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"), 189 IS_AVAIL1(cpu->extn.swap, "swap,"), 190 IS_AVAIL2(cpu->extn.minmax, "minmax,"), 191 IS_AVAIL1(cpu->extn.crc, "crc,"), 192 IS_AVAIL2(cpu->extn.ext_arith, "ext-arith")); 193 194 n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s", 195 mul_type_nm[cpu->extn.mul].str); 196 197 n += scnprintf(buf + n, len - n, " MAC MPY: %s\n", 198 mac_mul_nm[cpu->extn_mac_mul.type].str); 199 200 if (cpu->core.family == 0x34) { 201 n += scnprintf(buf + n, len - n, 202 "Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n", 203 IS_USED(CONFIG_ARC_HAS_LLSC), 204 IS_USED(CONFIG_ARC_HAS_SWAPE), 205 IS_USED(CONFIG_ARC_HAS_RTSC)); 206 } 207 208 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s", 209 !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : ""); 210 211 if (cpu->dccm.sz) 212 n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ", 213 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz)); 214 215 if (cpu->iccm.sz) 216 n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB", 217 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz)); 218 219 n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s", 220 !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : ""); 221 222 if (cpu->fp.ver) 223 n += scnprintf(buf + n, len - n, "SP [v%d] %s", 224 cpu->fp.ver, cpu->fp.fast ? "(fast)" : ""); 225 226 if (cpu->dpfp.ver) 227 n += scnprintf(buf + n, len - n, "DP [v%d] %s", 228 cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : ""); 229 230 n += scnprintf(buf + n, len - n, "\n"); 231 232 n += scnprintf(buf + n, len - n, 233 "OS ABI [v3]\t: no-legacy-syscalls\n"); 234 235 return buf; 236 } 237 238 static void arc_chk_ccms(void) 239 { 240 #if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM) 241 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 242 243 #ifdef CONFIG_ARC_HAS_DCCM 244 /* 245 * DCCM can be arbit placed in hardware. 246 * Make sure it's placement/sz matches what Linux is built with 247 */ 248 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr) 249 panic("Linux built with incorrect DCCM Base address\n"); 250 251 if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz) 252 panic("Linux built with incorrect DCCM Size\n"); 253 #endif 254 255 #ifdef CONFIG_ARC_HAS_ICCM 256 if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz) 257 panic("Linux built with incorrect ICCM Size\n"); 258 #endif 259 #endif 260 } 261 262 /* 263 * Ensure that FP hardware and kernel config match 264 * -If hardware contains DPFP, kernel needs to save/restore FPU state 265 * across context switches 266 * -If hardware lacks DPFP, but kernel configured to save FPU state then 267 * kernel trying to access non-existant DPFP regs will crash 268 * 269 * We only check for Dbl precision Floating Point, because only DPFP 270 * hardware has dedicated regs which need to be saved/restored on ctx-sw 271 * (Single Precision uses core regs), thus kernel is kind of oblivious to it 272 */ 273 static void arc_chk_fpu(void) 274 { 275 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 276 277 if (cpu->dpfp.ver) { 278 #ifndef CONFIG_ARC_FPU_SAVE_RESTORE 279 pr_warn("DPFP support broken in this kernel...\n"); 280 #endif 281 } else { 282 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 283 panic("H/w lacks DPFP support, apps won't work\n"); 284 #endif 285 } 286 } 287 288 /* 289 * Initialize and setup the processor core 290 * This is called by all the CPUs thus should not do special case stuff 291 * such as only for boot CPU etc 292 */ 293 294 void setup_processor(void) 295 { 296 char str[512]; 297 int cpu_id = smp_processor_id(); 298 299 read_arc_build_cfg_regs(); 300 arc_init_IRQ(); 301 302 printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str))); 303 304 arc_mmu_init(); 305 arc_cache_init(); 306 arc_chk_ccms(); 307 308 printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str))); 309 310 #ifdef CONFIG_SMP 311 printk(arc_platform_smp_cpuinfo()); 312 #endif 313 314 arc_chk_fpu(); 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(); 363 364 #ifdef CONFIG_SMP 365 smp_init_cpus(); 366 #endif 367 368 setup_arch_memory(); 369 370 /* copy flat DT out of .init and then unflatten it */ 371 unflatten_and_copy_device_tree(); 372 373 /* Can be issue if someone passes cmd line arg "ro" 374 * But that is unlikely so keeping it as it is 375 */ 376 root_mountflags &= ~MS_RDONLY; 377 378 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE) 379 conswitchp = &dummy_con; 380 #endif 381 382 arc_unwind_init(); 383 arc_unwind_setup(); 384 } 385 386 static int __init customize_machine(void) 387 { 388 /* Add platform devices */ 389 if (machine_desc->init_machine) 390 machine_desc->init_machine(); 391 392 return 0; 393 } 394 arch_initcall(customize_machine); 395 396 static int __init init_late_machine(void) 397 { 398 if (machine_desc->init_late) 399 machine_desc->init_late(); 400 401 return 0; 402 } 403 late_initcall(init_late_machine); 404 /* 405 * Get CPU information for use by the procfs. 406 */ 407 408 #define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c))) 409 #define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p)) 410 411 static int show_cpuinfo(struct seq_file *m, void *v) 412 { 413 char *str; 414 int cpu_id = ptr_to_cpu(v); 415 416 str = (char *)__get_free_page(GFP_TEMPORARY); 417 if (!str) 418 goto done; 419 420 seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE)); 421 422 seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n", 423 loops_per_jiffy / (500000 / HZ), 424 (loops_per_jiffy / (5000 / HZ)) % 100); 425 426 seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE)); 427 428 seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE)); 429 430 seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE)); 431 432 #ifdef CONFIG_SMP 433 seq_printf(m, arc_platform_smp_cpuinfo()); 434 #endif 435 436 free_page((unsigned long)str); 437 done: 438 seq_printf(m, "\n\n"); 439 440 return 0; 441 } 442 443 static void *c_start(struct seq_file *m, loff_t *pos) 444 { 445 /* 446 * Callback returns cpu-id to iterator for show routine, NULL to stop. 447 * However since NULL is also a valid cpu-id (0), we use a round-about 448 * way to pass it w/o having to kmalloc/free a 2 byte string. 449 * Encode cpu-id as 0xFFcccc, which is decoded by show routine. 450 */ 451 return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL; 452 } 453 454 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 455 { 456 ++*pos; 457 return c_start(m, pos); 458 } 459 460 static void c_stop(struct seq_file *m, void *v) 461 { 462 } 463 464 const struct seq_operations cpuinfo_op = { 465 .start = c_start, 466 .next = c_next, 467 .stop = c_stop, 468 .show = show_cpuinfo 469 }; 470 471 static DEFINE_PER_CPU(struct cpu, cpu_topology); 472 473 static int __init topology_init(void) 474 { 475 int cpu; 476 477 for_each_present_cpu(cpu) 478 register_cpu(&per_cpu(cpu_topology, cpu), cpu); 479 480 return 0; 481 } 482 483 subsys_initcall(topology_init); 484