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 /* 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_arc_build_cfg_regs(void)
  44 {
  45         struct bcr_perip uncached_space;
  46         struct bcr_generic bcr;
  47         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
  48         FIX_PTR(cpu);
  49
  50         READ_BCR(AUX_IDENTITY, cpu->core);
  51         READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
  52
  53         READ_BCR(ARC_REG_TIMERS_BCR, cpu->timers);
  54         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
  55
  56         READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
  57         cpu->uncached_base = uncached_space.start << 24;
  58
  59         READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
  60
  61         cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
  62         cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
  63         cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0;        /* 1,3 */
  64         cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
  65         cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
  66
  67         /* Note that we read the CCM BCRs independent of kernel config
  68          * This is to catch the cases where user doesn't know that
  69          * CCMs are present in hardware build
  70          */
  71         {
  72                 struct bcr_iccm iccm;
  73                 struct bcr_dccm dccm;
  74                 struct bcr_dccm_base dccm_base;
  75                 unsigned int bcr_32bit_val;
  76
  77                 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
  78                 if (bcr_32bit_val) {
  79                         iccm = *((struct bcr_iccm *)&bcr_32bit_val);
  80                         cpu->iccm.base_addr = iccm.base << 16;
  81                         cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
  82                 }
  83
  84                 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
  85                 if (bcr_32bit_val) {
  86                         dccm = *((struct bcr_dccm *)&bcr_32bit_val);
  87                         cpu->dccm.sz = 0x800 << (dccm.sz);
  88
  89                         READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
  90                         cpu->dccm.base_addr = dccm_base.addr << 8;
  91                 }
  92         }
  93
  94         READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
  95
  96         read_decode_mmu_bcr();
  97         read_decode_cache_bcr();
  98
  99         {
 100                 struct bcr_fp_arcompact sp, dp;
 101                 struct bcr_bpu_arcompact bpu;
 102
 103                 READ_BCR(ARC_REG_FP_BCR, sp);
 104                 READ_BCR(ARC_REG_DPFP_BCR, dp);
 105                 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
 106                 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
 107
 108                 READ_BCR(ARC_REG_BPU_BCR, bpu);
 109                 cpu->bpu.ver = bpu.ver;
 110                 cpu->bpu.full = bpu.fam ? 1 : 0;
 111                 if (bpu.ent) {
 112                         cpu->bpu.num_cache = 256 << (bpu.ent - 1);
 113                         cpu->bpu.num_pred = 256 << (bpu.ent - 1);
 114                 }
 115         }
 116
 117         READ_BCR(ARC_REG_AP_BCR, bcr);
 118         cpu->extn.ap = bcr.ver ? 1 : 0;
 119
 120         READ_BCR(ARC_REG_SMART_BCR, bcr);
 121         cpu->extn.smart = bcr.ver ? 1 : 0;
 122
 123         READ_BCR(ARC_REG_RTT_BCR, bcr);
 124         cpu->extn.rtt = bcr.ver ? 1 : 0;
 125
 126         cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
 127 }
 128
 129 static const struct cpuinfo_data arc_cpu_tbl[] = {
 130         { {0x20, "ARC 600"      }, 0x2F},
 131         { {0x30, "ARC 700"      }, 0x33},
 132         { {0x34, "ARC 700 R4.10"}, 0x34},
 133         { {0x35, "ARC 700 R4.11"}, 0x35},
 134         { {0x00, NULL           } }
 135 };
 136
 137 #define IS_AVAIL1(v, str)       ((v) ? str : "")
 138 #define IS_USED(cfg)            (IS_ENABLED(cfg) ? "" : "(not used) ")
 139 #define IS_AVAIL2(v, str, cfg)  IS_AVAIL1(v, str), IS_AVAIL1(v, IS_USED(cfg))
 140
 141 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 142 {
 143         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 144         struct bcr_identity *core = &cpu->core;
 145         const struct cpuinfo_data *tbl;
 146         char *isa_nm;
 147         int i, be, atomic;
 148         int n = 0;
 149
 150         FIX_PTR(cpu);
 151
 152         {
 153                 isa_nm = "ARCompact";
 154                 be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
 155
 156                 atomic = cpu->isa.atomic1;
 157                 if (!cpu->isa.ver)      /* ISA BCR absent, use Kconfig info */
 158                         atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
 159         }
 160
 161         n += scnprintf(buf + n, len - n,
 162                        "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
 163                        core->family, core->cpu_id, core->chip_id);
 164
 165         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
 166                 if ((core->family >= tbl->info.id) &&
 167                     (core->family <= tbl->up_range)) {
 168                         n += scnprintf(buf + n, len - n,
 169                                        "processor [%d]\t: %s (%s ISA) %s\n",
 170                                        cpu_id, tbl->info.str, isa_nm,
 171                                        IS_AVAIL1(be, "[Big-Endian]"));
 172                         break;
 173                 }
 174         }
 175
 176         if (tbl->info.id == 0)
 177                 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
 178
 179         n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
 180                        (unsigned int)(arc_get_core_freq() / 1000000),
 181                        (unsigned int)(arc_get_core_freq() / 10000) % 100);
 182
 183         n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s\nISA Extn\t: ",
 184                        IS_AVAIL1(cpu->timers.t0, "Timer0 "),
 185                        IS_AVAIL1(cpu->timers.t1, "Timer1 "));
 186
 187         n += i = scnprintf(buf + n, len - n, "%s%s",
 188                            IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC));
 189
 190         if (i)
 191                 n += scnprintf(buf + n, len - n, "\n\t\t: ");
 192
 193         n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
 194                        IS_AVAIL1(cpu->extn_mpy.ver, "mpy "),
 195                        IS_AVAIL1(cpu->extn.norm, "norm "),
 196                        IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
 197                        IS_AVAIL1(cpu->extn.swap, "swap "),
 198                        IS_AVAIL1(cpu->extn.minmax, "minmax "),
 199                        IS_AVAIL1(cpu->extn.crc, "crc "),
 200                        IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
 201
 202         if (cpu->bpu.ver)
 203                 n += scnprintf(buf + n, len - n,
 204                               "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
 205                               IS_AVAIL1(cpu->bpu.full, "full"),
 206                               IS_AVAIL1(!cpu->bpu.full, "partial"),
 207                               cpu->bpu.num_cache, cpu->bpu.num_pred);
 208
 209         return buf;
 210 }
 211
 212 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 213 {
 214         int n = 0;
 215         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 216
 217         FIX_PTR(cpu);
 218
 219         n += scnprintf(buf + n, len - n,
 220                        "Vector Table\t: %#x\nUncached Base\t: %#x\n",
 221                        cpu->vec_base, cpu->uncached_base);
 222
 223         if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
 224                 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
 225                                IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
 226                                IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
 227
 228         if (cpu->extn.debug)
 229                 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
 230                                IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
 231                                IS_AVAIL1(cpu->extn.smart, "smaRT "),
 232                                IS_AVAIL1(cpu->extn.rtt, "RTT "));
 233
 234         if (cpu->dccm.sz || cpu->iccm.sz)
 235                 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
 236                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
 237                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
 238
 239         n += scnprintf(buf + n, len - n,
 240                        "OS ABI [v3]\t: no-legacy-syscalls\n");
 241
 242         return buf;
 243 }
 244
 245 static void arc_chk_core_config(void)
 246 {
 247         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 248         int fpu_enabled;
 249
 250         if (!cpu->timers.t0)
 251                 panic("Timer0 is not present!\n");
 252
 253         if (!cpu->timers.t1)
 254                 panic("Timer1 is not present!\n");
 255
 256 #ifdef CONFIG_ARC_HAS_DCCM
 257         /*
 258          * DCCM can be arbit placed in hardware.
 259          * Make sure it's placement/sz matches what Linux is built with
 260          */
 261         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
 262                 panic("Linux built with incorrect DCCM Base address\n");
 263
 264         if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
 265                 panic("Linux built with incorrect DCCM Size\n");
 266 #endif
 267
 268 #ifdef CONFIG_ARC_HAS_ICCM
 269         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
 270                 panic("Linux built with incorrect ICCM Size\n");
 271 #endif
 272
 273         /*
 274          * FP hardware/software config sanity
 275          * -If hardware contains DPFP, kernel needs to save/restore FPU state
 276          * -If not, it will crash trying to save/restore the non-existant regs
 277          *
 278          * (only DPDP checked since SP has no arch visible regs)
 279          */
 280         fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
 281
 282         if (cpu->extn.fpu_dp && !fpu_enabled)
 283                 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
 284         else if (!cpu->extn.fpu_dp && fpu_enabled)
 285                 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
 286 }
 287
 288 /*
 289  * Initialize and setup the processor core
 290  * This is called by all the CPUs thus should not do special case stuff
 291  *    such as only for boot CPU etc
 292  */
 293
 294 void setup_processor(void)
 295 {
 296         char str[512];
 297         int cpu_id = smp_processor_id();
 298
 299         read_arc_build_cfg_regs();
 300         arc_init_IRQ();
 301
 302         printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
 303
 304         arc_mmu_init();
 305         arc_cache_init();
 306
 307         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
 308         printk(arc_platform_smp_cpuinfo());
 309
 310         arc_chk_core_config();
 311 }
 312
 313 static inline int is_kernel(unsigned long addr)
 314 {
 315         if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
 316                 return 1;
 317         return 0;
 318 }
 319
 320 void __init setup_arch(char **cmdline_p)
 321 {
 322 #ifdef CONFIG_ARC_UBOOT_SUPPORT
 323         /* make sure that uboot passed pointer to cmdline/dtb is valid */
 324         if (uboot_tag && is_kernel((unsigned long)uboot_arg))
 325                 panic("Invalid uboot arg\n");
 326
 327         /* See if u-boot passed an external Device Tree blob */
 328         machine_desc = setup_machine_fdt(uboot_arg);    /* uboot_tag == 2 */
 329         if (!machine_desc)
 330 #endif
 331         {
 332                 /* No, so try the embedded one */
 333                 machine_desc = setup_machine_fdt(__dtb_start);
 334                 if (!machine_desc)
 335                         panic("Embedded DT invalid\n");
 336
 337                 /*
 338                  * If we are here, it is established that @uboot_arg didn't
 339                  * point to DT blob. Instead if u-boot says it is cmdline,
 340                  * Appent to embedded DT cmdline.
 341                  * setup_machine_fdt() would have populated @boot_command_line
 342                  */
 343                 if (uboot_tag == 1) {
 344                         /* Ensure a whitespace between the 2 cmdlines */
 345                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 346                         strlcat(boot_command_line, uboot_arg,
 347                                 COMMAND_LINE_SIZE);
 348                 }
 349         }
 350
 351         /* Save unparsed command line copy for /proc/cmdline */
 352         *cmdline_p = boot_command_line;
 353
 354         /* To force early parsing of things like mem=xxx */
 355         parse_early_param();
 356
 357         /* Platform/board specific: e.g. early console registration */
 358         if (machine_desc->init_early)
 359                 machine_desc->init_early();
 360
 361         setup_processor();
 362         smp_init_cpus();
 363         setup_arch_memory();
 364
 365         /* copy flat DT out of .init and then unflatten it */
 366         unflatten_and_copy_device_tree();
 367
 368         /* Can be issue if someone passes cmd line arg "ro"
 369          * But that is unlikely so keeping it as it is
 370          */
 371         root_mountflags &= ~MS_RDONLY;
 372
 373 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
 374         conswitchp = &dummy_con;
 375 #endif
 376
 377         arc_unwind_init();
 378         arc_unwind_setup();
 379 }
 380
 381 static int __init customize_machine(void)
 382 {
 383         of_clk_init(NULL);
 384         /*
 385          * Traverses flattened DeviceTree - registering platform devices
 386          * (if any) complete with their resources
 387          */
 388         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 389
 390         if (machine_desc->init_machine)
 391                 machine_desc->init_machine();
 392
 393         return 0;
 394 }
 395 arch_initcall(customize_machine);
 396
 397 static int __init init_late_machine(void)
 398 {
 399         if (machine_desc->init_late)
 400                 machine_desc->init_late();
 401
 402         return 0;
 403 }
 404 late_initcall(init_late_machine);
 405 /*
 406  *  Get CPU information for use by the procfs.
 407  */
 408
 409 #define cpu_to_ptr(c)   ((void *)(0xFFFF0000 | (unsigned int)(c)))
 410 #define ptr_to_cpu(p)   (~0xFFFF0000UL & (unsigned int)(p))
 411
 412 static int show_cpuinfo(struct seq_file *m, void *v)
 413 {
 414         char *str;
 415         int cpu_id = ptr_to_cpu(v);
 416
 417         if (!cpu_online(cpu_id)) {
 418                 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
 419                 goto done;
 420         }
 421
 422         str = (char *)__get_free_page(GFP_TEMPORARY);
 423         if (!str)
 424                 goto done;
 425
 426         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 427
 428         seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
 429                    loops_per_jiffy / (500000 / HZ),
 430                    (loops_per_jiffy / (5000 / HZ)) % 100);
 431
 432         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 433         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
 434         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
 435         seq_printf(m, arc_platform_smp_cpuinfo());
 436
 437         free_page((unsigned long)str);
 438 done:
 439         seq_printf(m, "\n");
 440
 441         return 0;
 442 }
 443
 444 static void *c_start(struct seq_file *m, loff_t *pos)
 445 {
 446         /*
 447          * Callback returns cpu-id to iterator for show routine, NULL to stop.
 448          * However since NULL is also a valid cpu-id (0), we use a round-about
 449          * way to pass it w/o having to kmalloc/free a 2 byte string.
 450          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
 451          */
 452         return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
 453 }
 454
 455 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 456 {
 457         ++*pos;
 458         return c_start(m, pos);
 459 }
 460
 461 static void c_stop(struct seq_file *m, void *v)
 462 {
 463 }
 464
 465 const struct seq_operations cpuinfo_op = {
 466         .start  = c_start,
 467         .next   = c_next,
 468         .stop   = c_stop,
 469         .show   = show_cpuinfo
 470 };
 471
 472 static DEFINE_PER_CPU(struct cpu, cpu_topology);
 473
 474 static int __init topology_init(void)
 475 {
 476         int cpu;
 477
 478         for_each_present_cpu(cpu)
 479             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
 480
 481         return 0;
 482 }
 483
 484 subsys_initcall(topology_init);