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.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
  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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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);