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 <asm/sections.h>
  18 #include <asm/arcregs.h>
  19 #include <asm/tlb.h>
  20 #include <asm/cache.h>
  21 #include <asm/setup.h>
  22 #include <asm/page.h>
  23 #include <asm/irq.h>
  24 #include <asm/arcregs.h>
  25 #include <asm/prom.h>
  26 #include <asm/unwind.h>
  27 #include <asm/clk.h>
  28 #include <asm/mach_desc.h>
  29
  30 #define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))
  31
  32 int running_on_hw = 1;  /* vs. on ISS */
  33
  34 char __initdata command_line[COMMAND_LINE_SIZE];
  35 struct machine_desc *machine_desc __initdata;
  36
  37 struct task_struct *_current_task[NR_CPUS];     /* For stack switching */
  38
  39 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
  40
  41
  42 void __init read_arc_build_cfg_regs(void)
  43 {
  44         struct bcr_perip uncached_space;
  45         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
  46         FIX_PTR(cpu);
  47
  48         READ_BCR(AUX_IDENTITY, cpu->core);
  49
  50         cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR);
  51
  52         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
  53         if (cpu->vec_base == 0)
  54                 cpu->vec_base = (unsigned int)_int_vec_base_lds;
  55
  56         READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
  57         cpu->uncached_base = uncached_space.start << 24;
  58
  59         cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR);
  60         cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR);
  61         cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR);
  62         cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR);
  63         cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR);
  64         READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul);
  65
  66         cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR);
  67         cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR);
  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         READ_BCR(ARC_REG_FP_BCR, cpu->fp);
 102         READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp);
 103 }
 104
 105 static const struct cpuinfo_data arc_cpu_tbl[] = {
 106         { {0x10, "ARCTangent A5"}, 0x1F},
 107         { {0x20, "ARC 600"      }, 0x2F},
 108         { {0x30, "ARC 700"      }, 0x33},
 109         { {0x34, "ARC 700 R4.10"}, 0x34},
 110         { {0x00, NULL           } }
 111 };
 112
 113 char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 114 {
 115         int n = 0;
 116         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 117         struct bcr_identity *core = &cpu->core;
 118         const struct cpuinfo_data *tbl;
 119         int be = 0;
 120 #ifdef CONFIG_CPU_BIG_ENDIAN
 121         be = 1;
 122 #endif
 123         FIX_PTR(cpu);
 124
 125         n += scnprintf(buf + n, len - n,
 126                        "\nARC IDENTITY\t: Family [%#02x]"
 127                        " Cpu-id [%#02x] Chip-id [%#4x]\n",
 128                        core->family, core->cpu_id,
 129                        core->chip_id);
 130
 131         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
 132                 if ((core->family >= tbl->info.id) &&
 133                     (core->family <= tbl->up_range)) {
 134                         n += scnprintf(buf + n, len - n,
 135                                        "processor\t: %s %s\n",
 136                                        tbl->info.str,
 137                                        be ? "[Big Endian]" : "");
 138                         break;
 139                 }
 140         }
 141
 142         if (tbl->info.id == 0)
 143                 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
 144
 145         n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
 146                        (unsigned int)(arc_get_core_freq() / 1000000),
 147                        (unsigned int)(arc_get_core_freq() / 10000) % 100);
 148
 149         n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n",
 150                        (cpu->timers & 0x200) ? "TIMER1" : "",
 151                        (cpu->timers & 0x100) ? "TIMER0" : "");
 152
 153         n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n",
 154                        cpu->vec_base);
 155
 156         n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n",
 157                        cpu->uncached_base);
 158
 159         return buf;
 160 }
 161
 162 static const struct id_to_str mul_type_nm[] = {
 163         { 0x0, "N/A"},
 164         { 0x1, "32x32 (spl Result Reg)" },
 165         { 0x2, "32x32 (ANY Result Reg)" }
 166 };
 167
 168 static const struct id_to_str mac_mul_nm[] = {
 169         {0x0, "N/A"},
 170         {0x1, "N/A"},
 171         {0x2, "Dual 16 x 16"},
 172         {0x3, "N/A"},
 173         {0x4, "32x16"},
 174         {0x5, "N/A"},
 175         {0x6, "Dual 16x16 and 32x16"}
 176 };
 177
 178 char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 179 {
 180         int n = 0;
 181         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 182
 183         FIX_PTR(cpu);
 184 #define IS_AVAIL1(var, str)     ((var) ? str : "")
 185 #define IS_AVAIL2(var, str)     ((var == 0x2) ? str : "")
 186 #define IS_USED(var)            ((var) ? "(in-use)" : "(not used)")
 187
 188         n += scnprintf(buf + n, len - n,
 189                        "Extn [700-Base]\t: %s %s %s %s %s %s\n",
 190                        IS_AVAIL2(cpu->extn.norm, "norm,"),
 191                        IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"),
 192                        IS_AVAIL1(cpu->extn.swap, "swap,"),
 193                        IS_AVAIL2(cpu->extn.minmax, "minmax,"),
 194                        IS_AVAIL1(cpu->extn.crc, "crc,"),
 195                        IS_AVAIL2(cpu->extn.ext_arith, "ext-arith"));
 196
 197         n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s",
 198                        mul_type_nm[cpu->extn.mul].str);
 199
 200         n += scnprintf(buf + n, len - n, "   MAC MPY: %s\n",
 201                        mac_mul_nm[cpu->extn_mac_mul.type].str);
 202
 203         if (cpu->core.family == 0x34) {
 204                 n += scnprintf(buf + n, len - n,
 205                 "Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n",
 206                                IS_USED(__CONFIG_ARC_HAS_LLSC_VAL),
 207                                IS_USED(__CONFIG_ARC_HAS_SWAPE_VAL),
 208                                IS_USED(__CONFIG_ARC_HAS_RTSC_VAL));
 209         }
 210
 211         n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s",
 212                        !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : "");
 213
 214         if (cpu->dccm.sz)
 215                 n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ",
 216                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz));
 217
 218         if (cpu->iccm.sz)
 219                 n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB",
 220                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
 221
 222         n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s",
 223                        !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : "");
 224
 225         if (cpu->fp.ver)
 226                 n += scnprintf(buf + n, len - n, "SP [v%d] %s",
 227                                cpu->fp.ver, cpu->fp.fast ? "(fast)" : "");
 228
 229         if (cpu->dpfp.ver)
 230                 n += scnprintf(buf + n, len - n, "DP [v%d] %s",
 231                                cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : "");
 232
 233         n += scnprintf(buf + n, len - n, "\n");
 234
 235         n += scnprintf(buf + n, len - n,
 236                        "OS ABI [v3]\t: no-legacy-syscalls\n");
 237
 238         return buf;
 239 }
 240
 241 void __init arc_chk_ccms(void)
 242 {
 243 #if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM)
 244         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 245
 246 #ifdef CONFIG_ARC_HAS_DCCM
 247         /*
 248          * DCCM can be arbit placed in hardware.
 249          * Make sure it's placement/sz matches what Linux is built with
 250          */
 251         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
 252                 panic("Linux built with incorrect DCCM Base address\n");
 253
 254         if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
 255                 panic("Linux built with incorrect DCCM Size\n");
 256 #endif
 257
 258 #ifdef CONFIG_ARC_HAS_ICCM
 259         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
 260                 panic("Linux built with incorrect ICCM Size\n");
 261 #endif
 262 #endif
 263 }
 264
 265 /*
 266  * Ensure that FP hardware and kernel config match
 267  * -If hardware contains DPFP, kernel needs to save/restore FPU state
 268  *  across context switches
 269  * -If hardware lacks DPFP, but kernel configured to save FPU state then
 270  *  kernel trying to access non-existant DPFP regs will crash
 271  *
 272  * We only check for Dbl precision Floating Point, because only DPFP
 273  * hardware has dedicated regs which need to be saved/restored on ctx-sw
 274  * (Single Precision uses core regs), thus kernel is kind of oblivious to it
 275  */
 276 void __init arc_chk_fpu(void)
 277 {
 278         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 279
 280         if (cpu->dpfp.ver) {
 281 #ifndef CONFIG_ARC_FPU_SAVE_RESTORE
 282                 pr_warn("DPFP support broken in this kernel...\n");
 283 #endif
 284         } else {
 285 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE
 286                 panic("H/w lacks DPFP support, apps won't work\n");
 287 #endif
 288         }
 289 }
 290
 291 /*
 292  * Initialize and setup the processor core
 293  * This is called by all the CPUs thus should not do special case stuff
 294  *    such as only for boot CPU etc
 295  */
 296
 297 void __init setup_processor(void)
 298 {
 299         char str[512];
 300         int cpu_id = smp_processor_id();
 301
 302         read_arc_build_cfg_regs();
 303         arc_init_IRQ();
 304
 305         printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
 306
 307         arc_mmu_init();
 308         arc_cache_init();
 309         arc_chk_ccms();
 310
 311         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
 312
 313 #ifdef CONFIG_SMP
 314         printk(arc_platform_smp_cpuinfo());
 315 #endif
 316
 317         arc_chk_fpu();
 318 }
 319
 320 void __init setup_arch(char **cmdline_p)
 321 {
 322 #ifdef CONFIG_CMDLINE_UBOOT
 323         /* Make sure that a whitespace is inserted before */
 324         strlcat(command_line, " ", sizeof(command_line));
 325 #endif
 326         /*
 327          * Append .config cmdline to base command line, which might already
 328          * contain u-boot "bootargs" (handled by head.S, if so configured)
 329          */
 330         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 331
 332         /* Save unparsed command line copy for /proc/cmdline */
 333         strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 334         *cmdline_p = command_line;
 335
 336         machine_desc = setup_machine_fdt(__dtb_start);
 337         if (!machine_desc)
 338                 panic("Embedded DT invalid\n");
 339
 340         /* To force early parsing of things like mem=xxx */
 341         parse_early_param();
 342
 343         /* Platform/board specific: e.g. early console registration */
 344         if (machine_desc->init_early)
 345                 machine_desc->init_early();
 346
 347         setup_processor();
 348
 349 #ifdef CONFIG_SMP
 350         smp_init_cpus();
 351 #endif
 352
 353         setup_arch_memory();
 354
 355         /* copy flat DT out of .init and then unflatten it */
 356         copy_devtree();
 357         unflatten_device_tree();
 358
 359         /* Can be issue if someone passes cmd line arg "ro"
 360          * But that is unlikely so keeping it as it is
 361          */
 362         root_mountflags &= ~MS_RDONLY;
 363
 364         console_verbose();
 365
 366 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
 367         conswitchp = &dummy_con;
 368 #endif
 369
 370         arc_unwind_init();
 371         arc_unwind_setup();
 372 }
 373
 374 static int __init customize_machine(void)
 375 {
 376         /* Add platform devices */
 377         if (machine_desc->init_machine)
 378                 machine_desc->init_machine();
 379
 380         return 0;
 381 }
 382 arch_initcall(customize_machine);
 383
 384 static int __init init_late_machine(void)
 385 {
 386         if (machine_desc->init_late)
 387                 machine_desc->init_late();
 388
 389         return 0;
 390 }
 391 late_initcall(init_late_machine);
 392 /*
 393  *  Get CPU information for use by the procfs.
 394  */
 395
 396 #define cpu_to_ptr(c)   ((void *)(0xFFFF0000 | (unsigned int)(c)))
 397 #define ptr_to_cpu(p)   (~0xFFFF0000UL & (unsigned int)(p))
 398
 399 static int show_cpuinfo(struct seq_file *m, void *v)
 400 {
 401         char *str;
 402         int cpu_id = ptr_to_cpu(v);
 403
 404         str = (char *)__get_free_page(GFP_TEMPORARY);
 405         if (!str)
 406                 goto done;
 407
 408         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 409
 410         seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
 411                    loops_per_jiffy / (500000 / HZ),
 412                    (loops_per_jiffy / (5000 / HZ)) % 100);
 413
 414         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 415
 416         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
 417
 418         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
 419
 420 #ifdef CONFIG_SMP
 421         seq_printf(m, arc_platform_smp_cpuinfo());
 422 #endif
 423
 424         free_page((unsigned long)str);
 425 done:
 426         seq_printf(m, "\n\n");
 427
 428         return 0;
 429 }
 430
 431 static void *c_start(struct seq_file *m, loff_t *pos)
 432 {
 433         /*
 434          * Callback returns cpu-id to iterator for show routine, NULL to stop.
 435          * However since NULL is also a valid cpu-id (0), we use a round-about
 436          * way to pass it w/o having to kmalloc/free a 2 byte string.
 437          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
 438          */
 439         return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
 440 }
 441
 442 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 443 {
 444         ++*pos;
 445         return c_start(m, pos);
 446 }
 447
 448 static void c_stop(struct seq_file *m, void *v)
 449 {
 450 }
 451
 452 const struct seq_operations cpuinfo_op = {
 453         .start  = c_start,
 454         .next   = c_next,
 455         .stop   = c_stop,
 456         .show   = show_cpuinfo
 457 };
 458
 459 static DEFINE_PER_CPU(struct cpu, cpu_topology);
 460
 461 static int __init topology_init(void)
 462 {
 463         int cpu;
 464
 465         for_each_present_cpu(cpu)
 466             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
 467
 468         return 0;
 469 }
 470
 471 subsys_initcall(topology_init);