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/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 unsigned int intr_to_DE_cnt;
  34
  35 /* Part of U-boot ABI: see head.S */
  36 int __initdata uboot_tag;
  37 char __initdata *uboot_arg;
  38
  39 const struct machine_desc *machine_desc;
  40
  41 struct task_struct *_current_task[NR_CPUS];     /* For stack switching */
  42
  43 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
  44
  45 static void read_arc_build_cfg_regs(void)
  46 {
  47         struct bcr_perip uncached_space;
  48         struct bcr_generic bcr;
  49         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
  50         unsigned long perip_space;
  51         FIX_PTR(cpu);
  52
  53         READ_BCR(AUX_IDENTITY, cpu->core);
  54         READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
  55
  56         READ_BCR(ARC_REG_TIMERS_BCR, cpu->timers);
  57         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
  58
  59         READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
  60         if (uncached_space.ver < 3)
  61                 perip_space = uncached_space.start << 24;
  62         else
  63                 perip_space = read_aux_reg(AUX_NON_VOL) & 0xF0000000;
  64
  65         BUG_ON(perip_space != ARC_UNCACHED_ADDR_SPACE);
  66
  67         READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
  68
  69         cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
  70         cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
  71         cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0;        /* 1,3 */
  72         cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
  73         cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
  74
  75         /* Note that we read the CCM BCRs independent of kernel config
  76          * This is to catch the cases where user doesn't know that
  77          * CCMs are present in hardware build
  78          */
  79         {
  80                 struct bcr_iccm iccm;
  81                 struct bcr_dccm dccm;
  82                 struct bcr_dccm_base dccm_base;
  83                 unsigned int bcr_32bit_val;
  84
  85                 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
  86                 if (bcr_32bit_val) {
  87                         iccm = *((struct bcr_iccm *)&bcr_32bit_val);
  88                         cpu->iccm.base_addr = iccm.base << 16;
  89                         cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
  90                 }
  91
  92                 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
  93                 if (bcr_32bit_val) {
  94                         dccm = *((struct bcr_dccm *)&bcr_32bit_val);
  95                         cpu->dccm.sz = 0x800 << (dccm.sz);
  96
  97                         READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
  98                         cpu->dccm.base_addr = dccm_base.addr << 8;
  99                 }
 100         }
 101
 102         READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
 103
 104         read_decode_mmu_bcr();
 105         read_decode_cache_bcr();
 106
 107         if (is_isa_arcompact()) {
 108                 struct bcr_fp_arcompact sp, dp;
 109                 struct bcr_bpu_arcompact bpu;
 110
 111                 READ_BCR(ARC_REG_FP_BCR, sp);
 112                 READ_BCR(ARC_REG_DPFP_BCR, dp);
 113                 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
 114                 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
 115
 116                 READ_BCR(ARC_REG_BPU_BCR, bpu);
 117                 cpu->bpu.ver = bpu.ver;
 118                 cpu->bpu.full = bpu.fam ? 1 : 0;
 119                 if (bpu.ent) {
 120                         cpu->bpu.num_cache = 256 << (bpu.ent - 1);
 121                         cpu->bpu.num_pred = 256 << (bpu.ent - 1);
 122                 }
 123         } else {
 124                 struct bcr_fp_arcv2 spdp;
 125                 struct bcr_bpu_arcv2 bpu;
 126
 127                 READ_BCR(ARC_REG_FP_V2_BCR, spdp);
 128                 cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
 129                 cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
 130
 131                 READ_BCR(ARC_REG_BPU_BCR, bpu);
 132                 cpu->bpu.ver = bpu.ver;
 133                 cpu->bpu.full = bpu.ft;
 134                 cpu->bpu.num_cache = 256 << bpu.bce;
 135                 cpu->bpu.num_pred = 2048 << bpu.pte;
 136         }
 137
 138         READ_BCR(ARC_REG_AP_BCR, bcr);
 139         cpu->extn.ap = bcr.ver ? 1 : 0;
 140
 141         READ_BCR(ARC_REG_SMART_BCR, bcr);
 142         cpu->extn.smart = bcr.ver ? 1 : 0;
 143
 144         READ_BCR(ARC_REG_RTT_BCR, bcr);
 145         cpu->extn.rtt = bcr.ver ? 1 : 0;
 146
 147         cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
 148 }
 149
 150 static const struct cpuinfo_data arc_cpu_tbl[] = {
 151 #ifdef CONFIG_ISA_ARCOMPACT
 152         { {0x20, "ARC 600"      }, 0x2F},
 153         { {0x30, "ARC 700"      }, 0x33},
 154         { {0x34, "ARC 700 R4.10"}, 0x34},
 155         { {0x35, "ARC 700 R4.11"}, 0x35},
 156 #else
 157         { {0x50, "ARC HS38 R2.0"}, 0x51},
 158         { {0x52, "ARC HS38 R2.1"}, 0x52},
 159 #endif
 160         { {0x00, NULL           } }
 161 };
 162
 163
 164 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 165 {
 166         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 167         struct bcr_identity *core = &cpu->core;
 168         const struct cpuinfo_data *tbl;
 169         char *isa_nm;
 170         int i, be, atomic;
 171         int n = 0;
 172
 173         FIX_PTR(cpu);
 174
 175         if (is_isa_arcompact()) {
 176                 isa_nm = "ARCompact";
 177                 be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
 178
 179                 atomic = cpu->isa.atomic1;
 180                 if (!cpu->isa.ver)      /* ISA BCR absent, use Kconfig info */
 181                         atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
 182         } else {
 183                 isa_nm = "ARCv2";
 184                 be = cpu->isa.be;
 185                 atomic = cpu->isa.atomic;
 186         }
 187
 188         n += scnprintf(buf + n, len - n,
 189                        "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
 190                        core->family, core->cpu_id, core->chip_id);
 191
 192         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
 193                 if ((core->family >= tbl->info.id) &&
 194                     (core->family <= tbl->up_range)) {
 195                         n += scnprintf(buf + n, len - n,
 196                                        "processor [%d]\t: %s (%s ISA) %s\n",
 197                                        cpu_id, tbl->info.str, isa_nm,
 198                                        IS_AVAIL1(be, "[Big-Endian]"));
 199                         break;
 200                 }
 201         }
 202
 203         if (tbl->info.id == 0)
 204                 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
 205
 206         n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
 207                        (unsigned int)(arc_get_core_freq() / 1000000),
 208                        (unsigned int)(arc_get_core_freq() / 10000) % 100);
 209
 210         n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
 211                        IS_AVAIL1(cpu->timers.t0, "Timer0 "),
 212                        IS_AVAIL1(cpu->timers.t1, "Timer1 "),
 213                        IS_AVAIL2(cpu->timers.rtc, "64-bit RTC ",
 214                                  CONFIG_ARC_HAS_RTC));
 215
 216         n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
 217                            IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
 218                            IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
 219                            IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));
 220
 221         if (i)
 222                 n += scnprintf(buf + n, len - n, "\n\t\t: ");
 223
 224         if (cpu->extn_mpy.ver) {
 225                 if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */
 226                         n += scnprintf(buf + n, len - n, "mpy ");
 227                 } else {
 228                         int opt = 2;    /* stock MPY/MPYH */
 229
 230                         if (cpu->extn_mpy.dsp)  /* OPT 7-9 */
 231                                 opt = cpu->extn_mpy.dsp + 6;
 232
 233                         n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
 234                 }
 235                 n += scnprintf(buf + n, len - n, "%s",
 236                                IS_USED_CFG(CONFIG_ARC_HAS_HW_MPY));
 237         }
 238
 239         n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
 240                        IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
 241                        IS_AVAIL1(cpu->extn.norm, "norm "),
 242                        IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
 243                        IS_AVAIL1(cpu->extn.swap, "swap "),
 244                        IS_AVAIL1(cpu->extn.minmax, "minmax "),
 245                        IS_AVAIL1(cpu->extn.crc, "crc "),
 246                        IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
 247
 248         if (cpu->bpu.ver)
 249                 n += scnprintf(buf + n, len - n,
 250                               "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
 251                               IS_AVAIL1(cpu->bpu.full, "full"),
 252                               IS_AVAIL1(!cpu->bpu.full, "partial"),
 253                               cpu->bpu.num_cache, cpu->bpu.num_pred);
 254
 255         return buf;
 256 }
 257
 258 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 259 {
 260         int n = 0;
 261         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 262
 263         FIX_PTR(cpu);
 264
 265         n += scnprintf(buf + n, len - n,
 266                        "Vector Table\t: %#x\nUncached Base\t: %#x\n",
 267                        cpu->vec_base, ARC_UNCACHED_ADDR_SPACE);
 268
 269         if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
 270                 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
 271                                IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
 272                                IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
 273
 274         if (cpu->extn.debug)
 275                 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
 276                                IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
 277                                IS_AVAIL1(cpu->extn.smart, "smaRT "),
 278                                IS_AVAIL1(cpu->extn.rtt, "RTT "));
 279
 280         if (cpu->dccm.sz || cpu->iccm.sz)
 281                 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
 282                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
 283                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
 284
 285         n += scnprintf(buf + n, len - n,
 286                        "OS ABI [v3]\t: no-legacy-syscalls\n");
 287
 288         return buf;
 289 }
 290
 291 static void arc_chk_core_config(void)
 292 {
 293         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 294         int fpu_enabled;
 295
 296         if (!cpu->timers.t0)
 297                 panic("Timer0 is not present!\n");
 298
 299         if (!cpu->timers.t1)
 300                 panic("Timer1 is not present!\n");
 301
 302         if (IS_ENABLED(CONFIG_ARC_HAS_RTC) && !cpu->timers.rtc)
 303                 panic("RTC is not present\n");
 304
 305 #ifdef CONFIG_ARC_HAS_DCCM
 306         /*
 307          * DCCM can be arbit placed in hardware.
 308          * Make sure it's placement/sz matches what Linux is built with
 309          */
 310         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
 311                 panic("Linux built with incorrect DCCM Base address\n");
 312
 313         if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
 314                 panic("Linux built with incorrect DCCM Size\n");
 315 #endif
 316
 317 #ifdef CONFIG_ARC_HAS_ICCM
 318         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
 319                 panic("Linux built with incorrect ICCM Size\n");
 320 #endif
 321
 322         /*
 323          * FP hardware/software config sanity
 324          * -If hardware contains DPFP, kernel needs to save/restore FPU state
 325          * -If not, it will crash trying to save/restore the non-existant regs
 326          *
 327          * (only DPDP checked since SP has no arch visible regs)
 328          */
 329         fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
 330
 331         if (cpu->extn.fpu_dp && !fpu_enabled)
 332                 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
 333         else if (!cpu->extn.fpu_dp && fpu_enabled)
 334                 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
 335
 336         if (is_isa_arcv2() && IS_ENABLED(CONFIG_SMP) && cpu->isa.atomic &&
 337             !IS_ENABLED(CONFIG_ARC_STAR_9000923308))
 338                 panic("llock/scond livelock workaround missing\n");
 339 }
 340
 341 /*
 342  * Initialize and setup the processor core
 343  * This is called by all the CPUs thus should not do special case stuff
 344  *    such as only for boot CPU etc
 345  */
 346
 347 void setup_processor(void)
 348 {
 349         char str[512];
 350         int cpu_id = smp_processor_id();
 351
 352         read_arc_build_cfg_regs();
 353         arc_init_IRQ();
 354
 355         printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
 356
 357         arc_mmu_init();
 358         arc_cache_init();
 359
 360         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
 361         printk(arc_platform_smp_cpuinfo());
 362
 363         arc_chk_core_config();
 364 }
 365
 366 static inline int is_kernel(unsigned long addr)
 367 {
 368         if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
 369                 return 1;
 370         return 0;
 371 }
 372
 373 void __init setup_arch(char **cmdline_p)
 374 {
 375 #ifdef CONFIG_ARC_UBOOT_SUPPORT
 376         /* make sure that uboot passed pointer to cmdline/dtb is valid */
 377         if (uboot_tag && is_kernel((unsigned long)uboot_arg))
 378                 panic("Invalid uboot arg\n");
 379
 380         /* See if u-boot passed an external Device Tree blob */
 381         machine_desc = setup_machine_fdt(uboot_arg);    /* uboot_tag == 2 */
 382         if (!machine_desc)
 383 #endif
 384         {
 385                 /* No, so try the embedded one */
 386                 machine_desc = setup_machine_fdt(__dtb_start);
 387                 if (!machine_desc)
 388                         panic("Embedded DT invalid\n");
 389
 390                 /*
 391                  * If we are here, it is established that @uboot_arg didn't
 392                  * point to DT blob. Instead if u-boot says it is cmdline,
 393                  * Appent to embedded DT cmdline.
 394                  * setup_machine_fdt() would have populated @boot_command_line
 395                  */
 396                 if (uboot_tag == 1) {
 397                         /* Ensure a whitespace between the 2 cmdlines */
 398                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 399                         strlcat(boot_command_line, uboot_arg,
 400                                 COMMAND_LINE_SIZE);
 401                 }
 402         }
 403
 404         /* Save unparsed command line copy for /proc/cmdline */
 405         *cmdline_p = boot_command_line;
 406
 407         /* To force early parsing of things like mem=xxx */
 408         parse_early_param();
 409
 410         /* Platform/board specific: e.g. early console registration */
 411         if (machine_desc->init_early)
 412                 machine_desc->init_early();
 413
 414         smp_init_cpus();
 415
 416         setup_processor();
 417         setup_arch_memory();
 418
 419         /* copy flat DT out of .init and then unflatten it */
 420         unflatten_and_copy_device_tree();
 421
 422         /* Can be issue if someone passes cmd line arg "ro"
 423          * But that is unlikely so keeping it as it is
 424          */
 425         root_mountflags &= ~MS_RDONLY;
 426
 427 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
 428         conswitchp = &dummy_con;
 429 #endif
 430
 431         arc_unwind_init();
 432         arc_unwind_setup();
 433 }
 434
 435 static int __init customize_machine(void)
 436 {
 437         of_clk_init(NULL);
 438         /*
 439          * Traverses flattened DeviceTree - registering platform devices
 440          * (if any) complete with their resources
 441          */
 442         of_platform_populate(NULL, of_default_bus_match_table, 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
 471         if (!cpu_online(cpu_id)) {
 472                 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
 473                 goto done;
 474         }
 475
 476         str = (char *)__get_free_page(GFP_TEMPORARY);
 477         if (!str)
 478                 goto done;
 479
 480         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 481
 482         seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
 483                    loops_per_jiffy / (500000 / HZ),
 484                    (loops_per_jiffy / (5000 / HZ)) % 100);
 485
 486         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 487         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
 488         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
 489         seq_printf(m, arc_platform_smp_cpuinfo());
 490
 491         free_page((unsigned long)str);
 492 done:
 493         seq_printf(m, "\n");
 494
 495         return 0;
 496 }
 497
 498 static void *c_start(struct seq_file *m, loff_t *pos)
 499 {
 500         /*
 501          * Callback returns cpu-id to iterator for show routine, NULL to stop.
 502          * However since NULL is also a valid cpu-id (0), we use a round-about
 503          * way to pass it w/o having to kmalloc/free a 2 byte string.
 504          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
 505          */
 506         return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
 507 }
 508
 509 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 510 {
 511         ++*pos;
 512         return c_start(m, pos);
 513 }
 514
 515 static void c_stop(struct seq_file *m, void *v)
 516 {
 517 }
 518
 519 const struct seq_operations cpuinfo_op = {
 520         .start  = c_start,
 521         .next   = c_next,
 522         .stop   = c_stop,
 523         .show   = show_cpuinfo
 524 };
 525
 526 static DEFINE_PER_CPU(struct cpu, cpu_topology);
 527
 528 static int __init topology_init(void)
 529 {
 530         int cpu;
 531
 532         for_each_present_cpu(cpu)
 533             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
 534
 535         return 0;
 536 }
 537
 538 subsys_initcall(topology_init);