arch/arc/kernel/setup.c

   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_platform.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 void read_decode_ccm_bcr(struct cpuinfo_arc *cpu)
  44 {
  45         if (is_isa_arcompact()) {
  46                 struct bcr_iccm_arcompact iccm;
  47                 struct bcr_dccm_arcompact dccm;
  48
  49                 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
  50                 if (iccm.ver) {
  51                         cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */
  52                         cpu->iccm.base_addr = iccm.base << 16;
  53                 }
  54
  55                 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
  56                 if (dccm.ver) {
  57                         unsigned long base;
  58                         cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */
  59
  60                         base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD);
  61                         cpu->dccm.base_addr = base & ~0xF;
  62                 }
  63         } else {
  64                 struct bcr_iccm_arcv2 iccm;
  65                 struct bcr_dccm_arcv2 dccm;
  66                 unsigned long region;
  67
  68                 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
  69                 if (iccm.ver) {
  70                         cpu->iccm.sz = 256 << iccm.sz00;        /* 512B to 16M */
  71                         if (iccm.sz00 == 0xF && iccm.sz01 > 0)
  72                                 cpu->iccm.sz <<= iccm.sz01;
  73
  74                         region = read_aux_reg(ARC_REG_AUX_ICCM);
  75                         cpu->iccm.base_addr = region & 0xF0000000;
  76                 }
  77
  78                 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
  79                 if (dccm.ver) {
  80                         cpu->dccm.sz = 256 << dccm.sz0;
  81                         if (dccm.sz0 == 0xF && dccm.sz1 > 0)
  82                                 cpu->dccm.sz <<= dccm.sz1;
  83
  84                         region = read_aux_reg(ARC_REG_AUX_DCCM);
  85                         cpu->dccm.base_addr = region & 0xF0000000;
  86                 }
  87         }
  88 }
  89
  90 static void read_arc_build_cfg_regs(void)
  91 {
  92         struct bcr_timer timer;
  93         struct bcr_generic bcr;
  94         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
  95         FIX_PTR(cpu);
  96
  97         READ_BCR(AUX_IDENTITY, cpu->core);
  98         READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
  99
 100         READ_BCR(ARC_REG_TIMERS_BCR, timer);
 101         cpu->extn.timer0 = timer.t0;
 102         cpu->extn.timer1 = timer.t1;
 103         cpu->extn.rtc = timer.rtc;
 104
 105         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
 106
 107         READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
 108
 109         cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
 110         cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
 111         cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0;        /* 1,3 */
 112         cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
 113         cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
 114         READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
 115
 116         /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */
 117         read_decode_ccm_bcr(cpu);
 118
 119         read_decode_mmu_bcr();
 120         read_decode_cache_bcr();
 121
 122         if (is_isa_arcompact()) {
 123                 struct bcr_fp_arcompact sp, dp;
 124                 struct bcr_bpu_arcompact bpu;
 125
 126                 READ_BCR(ARC_REG_FP_BCR, sp);
 127                 READ_BCR(ARC_REG_DPFP_BCR, dp);
 128                 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
 129                 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
 130
 131                 READ_BCR(ARC_REG_BPU_BCR, bpu);
 132                 cpu->bpu.ver = bpu.ver;
 133                 cpu->bpu.full = bpu.fam ? 1 : 0;
 134                 if (bpu.ent) {
 135                         cpu->bpu.num_cache = 256 << (bpu.ent - 1);
 136                         cpu->bpu.num_pred = 256 << (bpu.ent - 1);
 137                 }
 138         } else {
 139                 struct bcr_fp_arcv2 spdp;
 140                 struct bcr_bpu_arcv2 bpu;
 141
 142                 READ_BCR(ARC_REG_FP_V2_BCR, spdp);
 143                 cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
 144                 cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
 145
 146                 READ_BCR(ARC_REG_BPU_BCR, bpu);
 147                 cpu->bpu.ver = bpu.ver;
 148                 cpu->bpu.full = bpu.ft;
 149                 cpu->bpu.num_cache = 256 << bpu.bce;
 150                 cpu->bpu.num_pred = 2048 << bpu.pte;
 151         }
 152
 153         READ_BCR(ARC_REG_AP_BCR, bcr);
 154         cpu->extn.ap = bcr.ver ? 1 : 0;
 155
 156         READ_BCR(ARC_REG_SMART_BCR, bcr);
 157         cpu->extn.smart = bcr.ver ? 1 : 0;
 158
 159         READ_BCR(ARC_REG_RTT_BCR, bcr);
 160         cpu->extn.rtt = bcr.ver ? 1 : 0;
 161
 162         cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
 163 }
 164
 165 static const struct cpuinfo_data arc_cpu_tbl[] = {
 166 #ifdef CONFIG_ISA_ARCOMPACT
 167         { {0x20, "ARC 600"      }, 0x2F},
 168         { {0x30, "ARC 700"      }, 0x33},
 169         { {0x34, "ARC 700 R4.10"}, 0x34},
 170         { {0x35, "ARC 700 R4.11"}, 0x35},
 171 #else
 172         { {0x50, "ARC HS38 R2.0"}, 0x51},
 173         { {0x52, "ARC HS38 R2.1"}, 0x52},
 174 #endif
 175         { {0x00, NULL           } }
 176 };
 177
 178
 179 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 180 {
 181         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 182         struct bcr_identity *core = &cpu->core;
 183         const struct cpuinfo_data *tbl;
 184         char *isa_nm;
 185         int i, be, atomic;
 186         int n = 0;
 187
 188         FIX_PTR(cpu);
 189
 190         if (is_isa_arcompact()) {
 191                 isa_nm = "ARCompact";
 192                 be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
 193
 194                 atomic = cpu->isa.atomic1;
 195                 if (!cpu->isa.ver)      /* ISA BCR absent, use Kconfig info */
 196                         atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
 197         } else {
 198                 isa_nm = "ARCv2";
 199                 be = cpu->isa.be;
 200                 atomic = cpu->isa.atomic;
 201         }
 202
 203         n += scnprintf(buf + n, len - n,
 204                        "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
 205                        core->family, core->cpu_id, core->chip_id);
 206
 207         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
 208                 if ((core->family >= tbl->info.id) &&
 209                     (core->family <= tbl->up_range)) {
 210                         n += scnprintf(buf + n, len - n,
 211                                        "processor [%d]\t: %s (%s ISA) %s\n",
 212                                        cpu_id, tbl->info.str, isa_nm,
 213                                        IS_AVAIL1(be, "[Big-Endian]"));
 214                         break;
 215                 }
 216         }
 217
 218         if (tbl->info.id == 0)
 219                 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
 220
 221         n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
 222                        IS_AVAIL1(cpu->extn.timer0, "Timer0 "),
 223                        IS_AVAIL1(cpu->extn.timer1, "Timer1 "),
 224                        IS_AVAIL2(cpu->extn.rtc, "Local-64-bit-Ctr ",
 225                                  CONFIG_ARC_HAS_RTC));
 226
 227         n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
 228                            IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
 229                            IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
 230                            IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));
 231
 232         if (i)
 233                 n += scnprintf(buf + n, len - n, "\n\t\t: ");
 234
 235         if (cpu->extn_mpy.ver) {
 236                 if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */
 237                         n += scnprintf(buf + n, len - n, "mpy ");
 238                 } else {
 239                         int opt = 2;    /* stock MPY/MPYH */
 240
 241                         if (cpu->extn_mpy.dsp)  /* OPT 7-9 */
 242                                 opt = cpu->extn_mpy.dsp + 6;
 243
 244                         n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
 245                 }
 246         }
 247
 248         n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
 249                        IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
 250                        IS_AVAIL1(cpu->extn.norm, "norm "),
 251                        IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
 252                        IS_AVAIL1(cpu->extn.swap, "swap "),
 253                        IS_AVAIL1(cpu->extn.minmax, "minmax "),
 254                        IS_AVAIL1(cpu->extn.crc, "crc "),
 255                        IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
 256
 257         if (cpu->bpu.ver)
 258                 n += scnprintf(buf + n, len - n,
 259                               "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
 260                               IS_AVAIL1(cpu->bpu.full, "full"),
 261                               IS_AVAIL1(!cpu->bpu.full, "partial"),
 262                               cpu->bpu.num_cache, cpu->bpu.num_pred);
 263
 264         return buf;
 265 }
 266
 267 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 268 {
 269         int n = 0;
 270         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 271
 272         FIX_PTR(cpu);
 273
 274         n += scnprintf(buf + n, len - n,
 275                        "Vector Table\t: %#x\nUncached Base\t: %#lx\n",
 276                        cpu->vec_base, perip_base);
 277
 278         if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
 279                 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
 280                                IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
 281                                IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
 282
 283         if (cpu->extn.debug)
 284                 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
 285                                IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
 286                                IS_AVAIL1(cpu->extn.smart, "smaRT "),
 287                                IS_AVAIL1(cpu->extn.rtt, "RTT "));
 288
 289         if (cpu->dccm.sz || cpu->iccm.sz)
 290                 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
 291                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
 292                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
 293
 294         n += scnprintf(buf + n, len - n,
 295                        "OS ABI [v3]\t: no-legacy-syscalls\n");
 296
 297         return buf;
 298 }
 299
 300 static void arc_chk_core_config(void)
 301 {
 302         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 303         int fpu_enabled;
 304
 305         if (!cpu->extn.timer0)
 306                 panic("Timer0 is not present!\n");
 307
 308         if (!cpu->extn.timer1)
 309                 panic("Timer1 is not present!\n");
 310
 311 #ifdef CONFIG_ARC_HAS_DCCM
 312         /*
 313          * DCCM can be arbit placed in hardware.
 314          * Make sure it's placement/sz matches what Linux is built with
 315          */
 316         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
 317                 panic("Linux built with incorrect DCCM Base address\n");
 318
 319         if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
 320                 panic("Linux built with incorrect DCCM Size\n");
 321 #endif
 322
 323 #ifdef CONFIG_ARC_HAS_ICCM
 324         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
 325                 panic("Linux built with incorrect ICCM Size\n");
 326 #endif
 327
 328         /*
 329          * FP hardware/software config sanity
 330          * -If hardware contains DPFP, kernel needs to save/restore FPU state
 331          * -If not, it will crash trying to save/restore the non-existant regs
 332          *
 333          * (only DPDP checked since SP has no arch visible regs)
 334          */
 335         fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
 336
 337         if (cpu->extn.fpu_dp && !fpu_enabled)
 338                 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
 339         else if (!cpu->extn.fpu_dp && fpu_enabled)
 340                 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
 341 }
 342
 343 /*
 344  * Initialize and setup the processor core
 345  * This is called by all the CPUs thus should not do special case stuff
 346  *    such as only for boot CPU etc
 347  */
 348
 349 void setup_processor(void)
 350 {
 351         char str[512];
 352         int cpu_id = smp_processor_id();
 353
 354         read_arc_build_cfg_regs();
 355         arc_init_IRQ();
 356
 357         printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
 358
 359         arc_mmu_init();
 360         arc_cache_init();
 361
 362         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
 363         printk(arc_platform_smp_cpuinfo());
 364
 365         arc_chk_core_config();
 366 }
 367
 368 static inline int is_kernel(unsigned long addr)
 369 {
 370         if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
 371                 return 1;
 372         return 0;
 373 }
 374
 375 void __init setup_arch(char **cmdline_p)
 376 {
 377 #ifdef CONFIG_ARC_UBOOT_SUPPORT
 378         /* make sure that uboot passed pointer to cmdline/dtb is valid */
 379         if (uboot_tag && is_kernel((unsigned long)uboot_arg))
 380                 panic("Invalid uboot arg\n");
 381
 382         /* See if u-boot passed an external Device Tree blob */
 383         machine_desc = setup_machine_fdt(uboot_arg);    /* uboot_tag == 2 */
 384         if (!machine_desc)
 385 #endif
 386         {
 387                 /* No, so try the embedded one */
 388                 machine_desc = setup_machine_fdt(__dtb_start);
 389                 if (!machine_desc)
 390                         panic("Embedded DT invalid\n");
 391
 392                 /*
 393                  * If we are here, it is established that @uboot_arg didn't
 394                  * point to DT blob. Instead if u-boot says it is cmdline,
 395                  * append to embedded DT cmdline.
 396                  * setup_machine_fdt() would have populated @boot_command_line
 397                  */
 398                 if (uboot_tag == 1) {
 399                         /* Ensure a whitespace between the 2 cmdlines */
 400                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 401                         strlcat(boot_command_line, uboot_arg,
 402                                 COMMAND_LINE_SIZE);
 403                 }
 404         }
 405
 406         /* Save unparsed command line copy for /proc/cmdline */
 407         *cmdline_p = boot_command_line;
 408
 409         /* To force early parsing of things like mem=xxx */
 410         parse_early_param();
 411
 412         /* Platform/board specific: e.g. early console registration */
 413         if (machine_desc->init_early)
 414                 machine_desc->init_early();
 415
 416         smp_init_cpus();
 417
 418         setup_processor();
 419         setup_arch_memory();
 420
 421         /* copy flat DT out of .init and then unflatten it */
 422         unflatten_and_copy_device_tree();
 423
 424         /* Can be issue if someone passes cmd line arg "ro"
 425          * But that is unlikely so keeping it as it is
 426          */
 427         root_mountflags &= ~MS_RDONLY;
 428
 429 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
 430         conswitchp = &dummy_con;
 431 #endif
 432
 433         arc_unwind_init();
 434 }
 435
 436 static int __init customize_machine(void)
 437 {
 438         /*
 439          * Traverses flattened DeviceTree - registering platform devices
 440          * (if any) complete with their resources
 441          */
 442         of_platform_default_populate(NULL, NULL, NULL);
 443
 444         if (machine_desc->init_machine)
 445                 machine_desc->init_machine();
 446
 447         return 0;
 448 }
 449 arch_initcall(customize_machine);
 450
 451 static int __init init_late_machine(void)
 452 {
 453         if (machine_desc->init_late)
 454                 machine_desc->init_late();
 455
 456         return 0;
 457 }
 458 late_initcall(init_late_machine);
 459 /*
 460  *  Get CPU information for use by the procfs.
 461  */
 462
 463 #define cpu_to_ptr(c)   ((void *)(0xFFFF0000 | (unsigned int)(c)))
 464 #define ptr_to_cpu(p)   (~0xFFFF0000UL & (unsigned int)(p))
 465
 466 static int show_cpuinfo(struct seq_file *m, void *v)
 467 {
 468         char *str;
 469         int cpu_id = ptr_to_cpu(v);
 470         struct device_node *core_clk = of_find_node_by_name(NULL, "core_clk");
 471         u32 freq = 0;
 472
 473         if (!cpu_online(cpu_id)) {
 474                 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
 475                 goto done;
 476         }
 477
 478         str = (char *)__get_free_page(GFP_TEMPORARY);
 479         if (!str)
 480                 goto done;
 481
 482         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 483
 484         of_property_read_u32(core_clk, "clock-frequency", &freq);
 485         if (freq)
 486                 seq_printf(m, "CPU speed\t: %u.%02u Mhz\n",
 487                            freq / 1000000, (freq / 10000) % 100);
 488
 489         seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
 490                    loops_per_jiffy / (500000 / HZ),
 491                    (loops_per_jiffy / (5000 / HZ)) % 100);
 492
 493         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 494         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
 495         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
 496         seq_printf(m, arc_platform_smp_cpuinfo());
 497
 498         free_page((unsigned long)str);
 499 done:
 500         seq_printf(m, "\n");
 501
 502         return 0;
 503 }
 504
 505 static void *c_start(struct seq_file *m, loff_t *pos)
 506 {
 507         /*
 508          * Callback returns cpu-id to iterator for show routine, NULL to stop.
 509          * However since NULL is also a valid cpu-id (0), we use a round-about
 510          * way to pass it w/o having to kmalloc/free a 2 byte string.
 511          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
 512          */
 513         return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
 514 }
 515
 516 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 517 {
 518         ++*pos;
 519         return c_start(m, pos);
 520 }
 521
 522 static void c_stop(struct seq_file *m, void *v)
 523 {
 524 }
 525
 526 const struct seq_operations cpuinfo_op = {
 527         .start  = c_start,
 528         .next   = c_next,
 529         .stop   = c_stop,
 530         .show   = show_cpuinfo
 531 };
 532
 533 static DEFINE_PER_CPU(struct cpu, cpu_topology);
 534
 535 static int __init topology_init(void)
 536 {
 537         int cpu;
 538
 539         for_each_present_cpu(cpu)
 540             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
 541
 542         return 0;
 543 }
 544
 545 subsys_initcall(topology_init);