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         FIX_PTR(cpu);
  51
  52         READ_BCR(AUX_IDENTITY, cpu->core);
  53         READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
  54
  55         READ_BCR(ARC_REG_TIMERS_BCR, cpu->timers);
  56         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
  57
  58         READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
  59         BUG_ON((uncached_space.start << 24) != ARC_UNCACHED_ADDR_SPACE);
  60
  61         READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
  62
  63         cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
  64         cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
  65         cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0;        /* 1,3 */
  66         cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
  67         cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
  68
  69         /* Note that we read the CCM BCRs independent of kernel config
  70          * This is to catch the cases where user doesn't know that
  71          * CCMs are present in hardware build
  72          */
  73         {
  74                 struct bcr_iccm iccm;
  75                 struct bcr_dccm dccm;
  76                 struct bcr_dccm_base dccm_base;
  77                 unsigned int bcr_32bit_val;
  78
  79                 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
  80                 if (bcr_32bit_val) {
  81                         iccm = *((struct bcr_iccm *)&bcr_32bit_val);
  82                         cpu->iccm.base_addr = iccm.base << 16;
  83                         cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
  84                 }
  85
  86                 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
  87                 if (bcr_32bit_val) {
  88                         dccm = *((struct bcr_dccm *)&bcr_32bit_val);
  89                         cpu->dccm.sz = 0x800 << (dccm.sz);
  90
  91                         READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
  92                         cpu->dccm.base_addr = dccm_base.addr << 8;
  93                 }
  94         }
  95
  96         READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
  97
  98         read_decode_mmu_bcr();
  99         read_decode_cache_bcr();
 100
 101         if (is_isa_arcompact()) {
 102                 struct bcr_fp_arcompact sp, dp;
 103                 struct bcr_bpu_arcompact bpu;
 104
 105                 READ_BCR(ARC_REG_FP_BCR, sp);
 106                 READ_BCR(ARC_REG_DPFP_BCR, dp);
 107                 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
 108                 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
 109
 110                 READ_BCR(ARC_REG_BPU_BCR, bpu);
 111                 cpu->bpu.ver = bpu.ver;
 112                 cpu->bpu.full = bpu.fam ? 1 : 0;
 113                 if (bpu.ent) {
 114                         cpu->bpu.num_cache = 256 << (bpu.ent - 1);
 115                         cpu->bpu.num_pred = 256 << (bpu.ent - 1);
 116                 }
 117         } else {
 118                 struct bcr_fp_arcv2 spdp;
 119                 struct bcr_bpu_arcv2 bpu;
 120
 121                 READ_BCR(ARC_REG_FP_V2_BCR, spdp);
 122                 cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
 123                 cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
 124
 125                 READ_BCR(ARC_REG_BPU_BCR, bpu);
 126                 cpu->bpu.ver = bpu.ver;
 127                 cpu->bpu.full = bpu.ft;
 128                 cpu->bpu.num_cache = 256 << bpu.bce;
 129                 cpu->bpu.num_pred = 2048 << bpu.pte;
 130         }
 131
 132         READ_BCR(ARC_REG_AP_BCR, bcr);
 133         cpu->extn.ap = bcr.ver ? 1 : 0;
 134
 135         READ_BCR(ARC_REG_SMART_BCR, bcr);
 136         cpu->extn.smart = bcr.ver ? 1 : 0;
 137
 138         READ_BCR(ARC_REG_RTT_BCR, bcr);
 139         cpu->extn.rtt = bcr.ver ? 1 : 0;
 140
 141         cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
 142 }
 143
 144 static const struct cpuinfo_data arc_cpu_tbl[] = {
 145         { {0x20, "ARC 600"      }, 0x2F},
 146         { {0x30, "ARC 700"      }, 0x33},
 147         { {0x34, "ARC 700 R4.10"}, 0x34},
 148         { {0x35, "ARC 700 R4.11"}, 0x35},
 149         { {0x50, "ARC HS38"     }, 0x51},
 150         { {0x00, NULL           } }
 151 };
 152
 153 #define IS_AVAIL1(v, str)       ((v) ? str : "")
 154 #define IS_USED(cfg)            (IS_ENABLED(cfg) ? "" : "(not used) ")
 155 #define IS_AVAIL2(v, str, cfg)  IS_AVAIL1(v, str), IS_AVAIL1(v, IS_USED(cfg))
 156
 157 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 158 {
 159         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 160         struct bcr_identity *core = &cpu->core;
 161         const struct cpuinfo_data *tbl;
 162         char *isa_nm;
 163         int i, be, atomic;
 164         int n = 0;
 165
 166         FIX_PTR(cpu);
 167
 168         if (is_isa_arcompact()) {
 169                 isa_nm = "ARCompact";
 170                 be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
 171
 172                 atomic = cpu->isa.atomic1;
 173                 if (!cpu->isa.ver)      /* ISA BCR absent, use Kconfig info */
 174                         atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
 175         } else {
 176                 isa_nm = "ARCv2";
 177                 be = cpu->isa.be;
 178                 atomic = cpu->isa.atomic;
 179         }
 180
 181         n += scnprintf(buf + n, len - n,
 182                        "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
 183                        core->family, core->cpu_id, core->chip_id);
 184
 185         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
 186                 if ((core->family >= tbl->info.id) &&
 187                     (core->family <= tbl->up_range)) {
 188                         n += scnprintf(buf + n, len - n,
 189                                        "processor [%d]\t: %s (%s ISA) %s\n",
 190                                        cpu_id, tbl->info.str, isa_nm,
 191                                        IS_AVAIL1(be, "[Big-Endian]"));
 192                         break;
 193                 }
 194         }
 195
 196         if (tbl->info.id == 0)
 197                 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
 198
 199         n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
 200                        (unsigned int)(arc_get_core_freq() / 1000000),
 201                        (unsigned int)(arc_get_core_freq() / 10000) % 100);
 202
 203         n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
 204                        IS_AVAIL1(cpu->timers.t0, "Timer0 "),
 205                        IS_AVAIL1(cpu->timers.t1, "Timer1 "),
 206                        IS_AVAIL2(cpu->timers.rtc, "64-bit RTC ",
 207                                  CONFIG_ARC_HAS_RTC));
 208
 209         n += i = scnprintf(buf + n, len - n, "%s%s%s%s%s",
 210                            IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
 211                            IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
 212                            IS_AVAIL1(cpu->isa.unalign, "unalign (not used)"));
 213
 214         if (i)
 215                 n += scnprintf(buf + n, len - n, "\n\t\t: ");
 216
 217         if (cpu->extn_mpy.ver) {
 218                 if (cpu->extn_mpy.ver <= 0x2) { /* ARCompact */
 219                         n += scnprintf(buf + n, len - n, "mpy ");
 220                 } else {
 221                         int opt = 2;    /* stock MPY/MPYH */
 222
 223                         if (cpu->extn_mpy.dsp)  /* OPT 7-9 */
 224                                 opt = cpu->extn_mpy.dsp + 6;
 225
 226                         n += scnprintf(buf + n, len - n, "mpy[opt %d] ", opt);
 227                 }
 228                 n += scnprintf(buf + n, len - n, "%s",
 229                                IS_USED(CONFIG_ARC_HAS_HW_MPY));
 230         }
 231
 232         n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
 233                        IS_AVAIL1(cpu->isa.div_rem, "div_rem "),
 234                        IS_AVAIL1(cpu->extn.norm, "norm "),
 235                        IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
 236                        IS_AVAIL1(cpu->extn.swap, "swap "),
 237                        IS_AVAIL1(cpu->extn.minmax, "minmax "),
 238                        IS_AVAIL1(cpu->extn.crc, "crc "),
 239                        IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
 240
 241         if (cpu->bpu.ver)
 242                 n += scnprintf(buf + n, len - n,
 243                               "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
 244                               IS_AVAIL1(cpu->bpu.full, "full"),
 245                               IS_AVAIL1(!cpu->bpu.full, "partial"),
 246                               cpu->bpu.num_cache, cpu->bpu.num_pred);
 247
 248         return buf;
 249 }
 250
 251 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 252 {
 253         int n = 0;
 254         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 255
 256         FIX_PTR(cpu);
 257
 258         n += scnprintf(buf + n, len - n,
 259                        "Vector Table\t: %#x\nUncached Base\t: %#x\n",
 260                        cpu->vec_base, ARC_UNCACHED_ADDR_SPACE);
 261
 262         if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
 263                 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
 264                                IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
 265                                IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
 266
 267         if (cpu->extn.debug)
 268                 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
 269                                IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
 270                                IS_AVAIL1(cpu->extn.smart, "smaRT "),
 271                                IS_AVAIL1(cpu->extn.rtt, "RTT "));
 272
 273         if (cpu->dccm.sz || cpu->iccm.sz)
 274                 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
 275                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
 276                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
 277
 278         n += scnprintf(buf + n, len - n,
 279                        "OS ABI [v3]\t: no-legacy-syscalls\n");
 280
 281         return buf;
 282 }
 283
 284 static void arc_chk_core_config(void)
 285 {
 286         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 287         int fpu_enabled;
 288
 289         if (!cpu->timers.t0)
 290                 panic("Timer0 is not present!\n");
 291
 292         if (!cpu->timers.t1)
 293                 panic("Timer1 is not present!\n");
 294
 295         if (IS_ENABLED(CONFIG_ARC_HAS_RTC) && !cpu->timers.rtc)
 296                 panic("RTC is not present\n");
 297
 298 #ifdef CONFIG_ARC_HAS_DCCM
 299         /*
 300          * DCCM can be arbit placed in hardware.
 301          * Make sure it's placement/sz matches what Linux is built with
 302          */
 303         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
 304                 panic("Linux built with incorrect DCCM Base address\n");
 305
 306         if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
 307                 panic("Linux built with incorrect DCCM Size\n");
 308 #endif
 309
 310 #ifdef CONFIG_ARC_HAS_ICCM
 311         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
 312                 panic("Linux built with incorrect ICCM Size\n");
 313 #endif
 314
 315         /*
 316          * FP hardware/software config sanity
 317          * -If hardware contains DPFP, kernel needs to save/restore FPU state
 318          * -If not, it will crash trying to save/restore the non-existant regs
 319          *
 320          * (only DPDP checked since SP has no arch visible regs)
 321          */
 322         fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
 323
 324         if (cpu->extn.fpu_dp && !fpu_enabled)
 325                 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
 326         else if (!cpu->extn.fpu_dp && fpu_enabled)
 327                 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
 328 }
 329
 330 /*
 331  * Initialize and setup the processor core
 332  * This is called by all the CPUs thus should not do special case stuff
 333  *    such as only for boot CPU etc
 334  */
 335
 336 void setup_processor(void)
 337 {
 338         char str[512];
 339         int cpu_id = smp_processor_id();
 340
 341         read_arc_build_cfg_regs();
 342         arc_init_IRQ();
 343
 344         printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
 345
 346         arc_mmu_init();
 347         arc_cache_init();
 348
 349         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
 350         printk(arc_platform_smp_cpuinfo());
 351
 352         arc_chk_core_config();
 353 }
 354
 355 static inline int is_kernel(unsigned long addr)
 356 {
 357         if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
 358                 return 1;
 359         return 0;
 360 }
 361
 362 void __init setup_arch(char **cmdline_p)
 363 {
 364 #ifdef CONFIG_ARC_UBOOT_SUPPORT
 365         /* make sure that uboot passed pointer to cmdline/dtb is valid */
 366         if (uboot_tag && is_kernel((unsigned long)uboot_arg))
 367                 panic("Invalid uboot arg\n");
 368
 369         /* See if u-boot passed an external Device Tree blob */
 370         machine_desc = setup_machine_fdt(uboot_arg);    /* uboot_tag == 2 */
 371         if (!machine_desc)
 372 #endif
 373         {
 374                 /* No, so try the embedded one */
 375                 machine_desc = setup_machine_fdt(__dtb_start);
 376                 if (!machine_desc)
 377                         panic("Embedded DT invalid\n");
 378
 379                 /*
 380                  * If we are here, it is established that @uboot_arg didn't
 381                  * point to DT blob. Instead if u-boot says it is cmdline,
 382                  * Appent to embedded DT cmdline.
 383                  * setup_machine_fdt() would have populated @boot_command_line
 384                  */
 385                 if (uboot_tag == 1) {
 386                         /* Ensure a whitespace between the 2 cmdlines */
 387                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 388                         strlcat(boot_command_line, uboot_arg,
 389                                 COMMAND_LINE_SIZE);
 390                 }
 391         }
 392
 393         /* Save unparsed command line copy for /proc/cmdline */
 394         *cmdline_p = boot_command_line;
 395
 396         /* To force early parsing of things like mem=xxx */
 397         parse_early_param();
 398
 399         /* Platform/board specific: e.g. early console registration */
 400         if (machine_desc->init_early)
 401                 machine_desc->init_early();
 402
 403         setup_processor();
 404         smp_init_cpus();
 405         setup_arch_memory();
 406
 407         /* copy flat DT out of .init and then unflatten it */
 408         unflatten_and_copy_device_tree();
 409
 410         /* Can be issue if someone passes cmd line arg "ro"
 411          * But that is unlikely so keeping it as it is
 412          */
 413         root_mountflags &= ~MS_RDONLY;
 414
 415 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
 416         conswitchp = &dummy_con;
 417 #endif
 418
 419         arc_unwind_init();
 420         arc_unwind_setup();
 421 }
 422
 423 static int __init customize_machine(void)
 424 {
 425         of_clk_init(NULL);
 426         /*
 427          * Traverses flattened DeviceTree - registering platform devices
 428          * (if any) complete with their resources
 429          */
 430         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 431
 432         if (machine_desc->init_machine)
 433                 machine_desc->init_machine();
 434
 435         return 0;
 436 }
 437 arch_initcall(customize_machine);
 438
 439 static int __init init_late_machine(void)
 440 {
 441         if (machine_desc->init_late)
 442                 machine_desc->init_late();
 443
 444         return 0;
 445 }
 446 late_initcall(init_late_machine);
 447 /*
 448  *  Get CPU information for use by the procfs.
 449  */
 450
 451 #define cpu_to_ptr(c)   ((void *)(0xFFFF0000 | (unsigned int)(c)))
 452 #define ptr_to_cpu(p)   (~0xFFFF0000UL & (unsigned int)(p))
 453
 454 static int show_cpuinfo(struct seq_file *m, void *v)
 455 {
 456         char *str;
 457         int cpu_id = ptr_to_cpu(v);
 458
 459         if (!cpu_online(cpu_id)) {
 460                 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
 461                 goto done;
 462         }
 463
 464         str = (char *)__get_free_page(GFP_TEMPORARY);
 465         if (!str)
 466                 goto done;
 467
 468         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 469
 470         seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
 471                    loops_per_jiffy / (500000 / HZ),
 472                    (loops_per_jiffy / (5000 / HZ)) % 100);
 473
 474         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 475         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
 476         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
 477         seq_printf(m, arc_platform_smp_cpuinfo());
 478
 479         free_page((unsigned long)str);
 480 done:
 481         seq_printf(m, "\n");
 482
 483         return 0;
 484 }
 485
 486 static void *c_start(struct seq_file *m, loff_t *pos)
 487 {
 488         /*
 489          * Callback returns cpu-id to iterator for show routine, NULL to stop.
 490          * However since NULL is also a valid cpu-id (0), we use a round-about
 491          * way to pass it w/o having to kmalloc/free a 2 byte string.
 492          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
 493          */
 494         return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
 495 }
 496
 497 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 498 {
 499         ++*pos;
 500         return c_start(m, pos);
 501 }
 502
 503 static void c_stop(struct seq_file *m, void *v)
 504 {
 505 }
 506
 507 const struct seq_operations cpuinfo_op = {
 508         .start  = c_start,
 509         .next   = c_next,
 510         .stop   = c_stop,
 511         .show   = show_cpuinfo
 512 };
 513
 514 static DEFINE_PER_CPU(struct cpu, cpu_topology);
 515
 516 static int __init topology_init(void)
 517 {
 518         int cpu;
 519
 520         for_each_present_cpu(cpu)
 521             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
 522
 523         return 0;
 524 }
 525
 526 subsys_initcall(topology_init);