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