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/prom.h> 25 #include <asm/unwind.h> 26 #include <asm/clk.h> 27 #include <asm/mach_desc.h> 28 29 #define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x)) 30 31 int running_on_hw = 1; /* vs. on ISS */ 32 33 char __initdata command_line[COMMAND_LINE_SIZE]; 34 struct machine_desc *machine_desc; 35 36 struct task_struct *_current_task[NR_CPUS]; /* For stack switching */ 37 38 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS]; 39 40 41 void read_arc_build_cfg_regs(void) 42 { 43 struct bcr_perip uncached_space; 44 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 45 FIX_PTR(cpu); 46 47 READ_BCR(AUX_IDENTITY, cpu->core); 48 49 cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR); 50 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE); 51 52 READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space); 53 cpu->uncached_base = uncached_space.start << 24; 54 55 cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR); 56 cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR); 57 cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR); 58 cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR); 59 cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR); 60 READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul); 61 62 cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR); 63 cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR); 64 65 /* Note that we read the CCM BCRs independent of kernel config 66 * This is to catch the cases where user doesn't know that 67 * CCMs are present in hardware build 68 */ 69 { 70 struct bcr_iccm iccm; 71 struct bcr_dccm dccm; 72 struct bcr_dccm_base dccm_base; 73 unsigned int bcr_32bit_val; 74 75 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR); 76 if (bcr_32bit_val) { 77 iccm = *((struct bcr_iccm *)&bcr_32bit_val); 78 cpu->iccm.base_addr = iccm.base << 16; 79 cpu->iccm.sz = 0x2000 << (iccm.sz - 1); 80 } 81 82 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR); 83 if (bcr_32bit_val) { 84 dccm = *((struct bcr_dccm *)&bcr_32bit_val); 85 cpu->dccm.sz = 0x800 << (dccm.sz); 86 87 READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base); 88 cpu->dccm.base_addr = dccm_base.addr << 8; 89 } 90 } 91 92 READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem); 93 94 read_decode_mmu_bcr(); 95 read_decode_cache_bcr(); 96 97 READ_BCR(ARC_REG_FP_BCR, cpu->fp); 98 READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp); 99 } 100 101 static const struct cpuinfo_data arc_cpu_tbl[] = { 102 { {0x10, "ARCTangent A5"}, 0x1F}, 103 { {0x20, "ARC 600" }, 0x2F}, 104 { {0x30, "ARC 700" }, 0x33}, 105 { {0x34, "ARC 700 R4.10"}, 0x34}, 106 { {0x00, NULL } } 107 }; 108 109 char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len) 110 { 111 int n = 0; 112 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id]; 113 struct bcr_identity *core = &cpu->core; 114 const struct cpuinfo_data *tbl; 115 int be = 0; 116 #ifdef CONFIG_CPU_BIG_ENDIAN 117 be = 1; 118 #endif 119 FIX_PTR(cpu); 120 121 n += scnprintf(buf + n, len - n, 122 "\nARC IDENTITY\t: Family [%#02x]" 123 " Cpu-id [%#02x] Chip-id [%#4x]\n", 124 core->family, core->cpu_id, 125 core->chip_id); 126 127 for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) { 128 if ((core->family >= tbl->info.id) && 129 (core->family <= tbl->up_range)) { 130 n += scnprintf(buf + n, len - n, 131 "processor\t: %s %s\n", 132 tbl->info.str, 133 be ? "[Big Endian]" : ""); 134 break; 135 } 136 } 137 138 if (tbl->info.id == 0) 139 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n"); 140 141 n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n", 142 (unsigned int)(arc_get_core_freq() / 1000000), 143 (unsigned int)(arc_get_core_freq() / 10000) % 100); 144 145 n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n", 146 (cpu->timers & 0x200) ? "TIMER1" : "", 147 (cpu->timers & 0x100) ? "TIMER0" : ""); 148 149 n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n", 150 cpu->vec_base); 151 152 n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n", 153 cpu->uncached_base); 154 155 return buf; 156 } 157 158 static const struct id_to_str mul_type_nm[] = { 159 { 0x0, "N/A"}, 160 { 0x1, "32x32 (spl Result Reg)" }, 161 { 0x2, "32x32 (ANY Result Reg)" } 162 }; 163 164 static const struct id_to_str mac_mul_nm[] = { 165 {0x0, "N/A"}, 166 {0x1, "N/A"}, 167 {0x2, "Dual 16 x 16"}, 168 {0x3, "N/A"}, 169 {0x4, "32x16"}, 170 {0x5, "N/A"}, 171 {0x6, "Dual 16x16 and 32x16"} 172 }; 173 174 char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len) 175 { 176 int n = 0; 177 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id]; 178 179 FIX_PTR(cpu); 180 #define IS_AVAIL1(var, str) ((var) ? str : "") 181 #define IS_AVAIL2(var, str) ((var == 0x2) ? str : "") 182 #define IS_USED(cfg) (IS_ENABLED(cfg) ? "(in-use)" : "(not used)") 183 184 n += scnprintf(buf + n, len - n, 185 "Extn [700-Base]\t: %s %s %s %s %s %s\n", 186 IS_AVAIL2(cpu->extn.norm, "norm,"), 187 IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"), 188 IS_AVAIL1(cpu->extn.swap, "swap,"), 189 IS_AVAIL2(cpu->extn.minmax, "minmax,"), 190 IS_AVAIL1(cpu->extn.crc, "crc,"), 191 IS_AVAIL2(cpu->extn.ext_arith, "ext-arith")); 192 193 n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s", 194 mul_type_nm[cpu->extn.mul].str); 195 196 n += scnprintf(buf + n, len - n, " MAC MPY: %s\n", 197 mac_mul_nm[cpu->extn_mac_mul.type].str); 198 199 if (cpu->core.family == 0x34) { 200 n += scnprintf(buf + n, len - n, 201 "Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n", 202 IS_USED(CONFIG_ARC_HAS_LLSC), 203 IS_USED(CONFIG_ARC_HAS_SWAPE), 204 IS_USED(CONFIG_ARC_HAS_RTSC)); 205 } 206 207 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s", 208 !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : ""); 209 210 if (cpu->dccm.sz) 211 n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ", 212 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz)); 213 214 if (cpu->iccm.sz) 215 n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB", 216 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz)); 217 218 n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s", 219 !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : ""); 220 221 if (cpu->fp.ver) 222 n += scnprintf(buf + n, len - n, "SP [v%d] %s", 223 cpu->fp.ver, cpu->fp.fast ? "(fast)" : ""); 224 225 if (cpu->dpfp.ver) 226 n += scnprintf(buf + n, len - n, "DP [v%d] %s", 227 cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : ""); 228 229 n += scnprintf(buf + n, len - n, "\n"); 230 231 n += scnprintf(buf + n, len - n, 232 "OS ABI [v3]\t: no-legacy-syscalls\n"); 233 234 return buf; 235 } 236 237 void arc_chk_ccms(void) 238 { 239 #if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM) 240 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 241 242 #ifdef CONFIG_ARC_HAS_DCCM 243 /* 244 * DCCM can be arbit placed in hardware. 245 * Make sure it's placement/sz matches what Linux is built with 246 */ 247 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr) 248 panic("Linux built with incorrect DCCM Base address\n"); 249 250 if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz) 251 panic("Linux built with incorrect DCCM Size\n"); 252 #endif 253 254 #ifdef CONFIG_ARC_HAS_ICCM 255 if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz) 256 panic("Linux built with incorrect ICCM Size\n"); 257 #endif 258 #endif 259 } 260 261 /* 262 * Ensure that FP hardware and kernel config match 263 * -If hardware contains DPFP, kernel needs to save/restore FPU state 264 * across context switches 265 * -If hardware lacks DPFP, but kernel configured to save FPU state then 266 * kernel trying to access non-existant DPFP regs will crash 267 * 268 * We only check for Dbl precision Floating Point, because only DPFP 269 * hardware has dedicated regs which need to be saved/restored on ctx-sw 270 * (Single Precision uses core regs), thus kernel is kind of oblivious to it 271 */ 272 void arc_chk_fpu(void) 273 { 274 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; 275 276 if (cpu->dpfp.ver) { 277 #ifndef CONFIG_ARC_FPU_SAVE_RESTORE 278 pr_warn("DPFP support broken in this kernel...\n"); 279 #endif 280 } else { 281 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE 282 panic("H/w lacks DPFP support, apps won't work\n"); 283 #endif 284 } 285 } 286 287 /* 288 * Initialize and setup the processor core 289 * This is called by all the CPUs thus should not do special case stuff 290 * such as only for boot CPU etc 291 */ 292 293 void setup_processor(void) 294 { 295 char str[512]; 296 int cpu_id = smp_processor_id(); 297 298 read_arc_build_cfg_regs(); 299 arc_init_IRQ(); 300 301 printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str))); 302 303 arc_mmu_init(); 304 arc_cache_init(); 305 arc_chk_ccms(); 306 307 printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str))); 308 309 #ifdef CONFIG_SMP 310 printk(arc_platform_smp_cpuinfo()); 311 #endif 312 313 arc_chk_fpu(); 314 } 315 316 void __init setup_arch(char **cmdline_p) 317 { 318 /* This also populates @boot_command_line from /bootargs */ 319 machine_desc = setup_machine_fdt(__dtb_start); 320 if (!machine_desc) 321 panic("Embedded DT invalid\n"); 322 323 /* Append any u-boot provided cmdline */ 324 #ifdef CONFIG_CMDLINE_UBOOT 325 /* Add a whitespace seperator between the 2 cmdlines */ 326 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 327 strlcat(boot_command_line, command_line, COMMAND_LINE_SIZE); 328 #endif 329 330 /* Save unparsed command line copy for /proc/cmdline */ 331 *cmdline_p = boot_command_line; 332 333 /* To force early parsing of things like mem=xxx */ 334 parse_early_param(); 335 336 /* Platform/board specific: e.g. early console registration */ 337 if (machine_desc->init_early) 338 machine_desc->init_early(); 339 340 setup_processor(); 341 342 #ifdef CONFIG_SMP 343 smp_init_cpus(); 344 #endif 345 346 setup_arch_memory(); 347 348 /* copy flat DT out of .init and then unflatten it */ 349 copy_devtree(); 350 unflatten_device_tree(); 351 352 /* Can be issue if someone passes cmd line arg "ro" 353 * But that is unlikely so keeping it as it is 354 */ 355 root_mountflags &= ~MS_RDONLY; 356 357 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE) 358 conswitchp = &dummy_con; 359 #endif 360 361 arc_unwind_init(); 362 arc_unwind_setup(); 363 } 364 365 static int __init customize_machine(void) 366 { 367 /* Add platform devices */ 368 if (machine_desc->init_machine) 369 machine_desc->init_machine(); 370 371 return 0; 372 } 373 arch_initcall(customize_machine); 374 375 static int __init init_late_machine(void) 376 { 377 if (machine_desc->init_late) 378 machine_desc->init_late(); 379 380 return 0; 381 } 382 late_initcall(init_late_machine); 383 /* 384 * Get CPU information for use by the procfs. 385 */ 386 387 #define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c))) 388 #define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p)) 389 390 static int show_cpuinfo(struct seq_file *m, void *v) 391 { 392 char *str; 393 int cpu_id = ptr_to_cpu(v); 394 395 str = (char *)__get_free_page(GFP_TEMPORARY); 396 if (!str) 397 goto done; 398 399 seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE)); 400 401 seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n", 402 loops_per_jiffy / (500000 / HZ), 403 (loops_per_jiffy / (5000 / HZ)) % 100); 404 405 seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE)); 406 407 seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE)); 408 409 seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE)); 410 411 #ifdef CONFIG_SMP 412 seq_printf(m, arc_platform_smp_cpuinfo()); 413 #endif 414 415 free_page((unsigned long)str); 416 done: 417 seq_printf(m, "\n\n"); 418 419 return 0; 420 } 421 422 static void *c_start(struct seq_file *m, loff_t *pos) 423 { 424 /* 425 * Callback returns cpu-id to iterator for show routine, NULL to stop. 426 * However since NULL is also a valid cpu-id (0), we use a round-about 427 * way to pass it w/o having to kmalloc/free a 2 byte string. 428 * Encode cpu-id as 0xFFcccc, which is decoded by show routine. 429 */ 430 return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL; 431 } 432 433 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 434 { 435 ++*pos; 436 return c_start(m, pos); 437 } 438 439 static void c_stop(struct seq_file *m, void *v) 440 { 441 } 442 443 const struct seq_operations cpuinfo_op = { 444 .start = c_start, 445 .next = c_next, 446 .stop = c_stop, 447 .show = show_cpuinfo 448 }; 449 450 static DEFINE_PER_CPU(struct cpu, cpu_topology); 451 452 static int __init topology_init(void) 453 { 454 int cpu; 455 456 for_each_present_cpu(cpu) 457 register_cpu(&per_cpu(cpu_topology, cpu), cpu); 458 459 return 0; 460 } 461 462 subsys_initcall(topology_init); 463