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 <linux/cache.h>
  18 #include <asm/sections.h>
  19 #include <asm/arcregs.h>
  20 #include <asm/tlb.h>
  21 #include <asm/setup.h>
  22 #include <asm/page.h>
  23 #include <asm/irq.h>
  24 #include <asm/prom.h>
  25 #include <asm/unwind.h>
  26 #include <asm/clk.h>
  27 #include <asm/mach_desc.h>
  28
  29 #define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))
  30
  31 int running_on_hw = 1;  /* vs. on ISS */
  32
  33 char __initdata command_line[COMMAND_LINE_SIZE];
  34 struct machine_desc *machine_desc;
  35
  36 struct task_struct *_current_task[NR_CPUS];     /* For stack switching */
  37
  38 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
  39
  40
  41 void read_arc_build_cfg_regs(void)
  42 {
  43         struct bcr_perip uncached_space;
  44         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
  45         FIX_PTR(cpu);
  46
  47         READ_BCR(AUX_IDENTITY, cpu->core);
  48
  49         cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR);
  50         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
  51
  52         READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
  53         cpu->uncached_base = uncached_space.start << 24;
  54
  55         cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR);
  56         cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR);
  57         cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR);
  58         cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR);
  59         cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR);
  60         READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul);
  61
  62         cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR);
  63         cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR);
  64
  65         /* Note that we read the CCM BCRs independent of kernel config
  66          * This is to catch the cases where user doesn't know that
  67          * CCMs are present in hardware build
  68          */
  69         {
  70                 struct bcr_iccm iccm;
  71                 struct bcr_dccm dccm;
  72                 struct bcr_dccm_base dccm_base;
  73                 unsigned int bcr_32bit_val;
  74
  75                 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
  76                 if (bcr_32bit_val) {
  77                         iccm = *((struct bcr_iccm *)&bcr_32bit_val);
  78                         cpu->iccm.base_addr = iccm.base << 16;
  79                         cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
  80                 }
  81
  82                 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
  83                 if (bcr_32bit_val) {
  84                         dccm = *((struct bcr_dccm *)&bcr_32bit_val);
  85                         cpu->dccm.sz = 0x800 << (dccm.sz);
  86
  87                         READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
  88                         cpu->dccm.base_addr = dccm_base.addr << 8;
  89                 }
  90         }
  91
  92         READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
  93
  94         read_decode_mmu_bcr();
  95         read_decode_cache_bcr();
  96
  97         READ_BCR(ARC_REG_FP_BCR, cpu->fp);
  98         READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp);
  99 }
 100
 101 static const struct cpuinfo_data arc_cpu_tbl[] = {
 102         { {0x10, "ARCTangent A5"}, 0x1F},
 103         { {0x20, "ARC 600"      }, 0x2F},
 104         { {0x30, "ARC 700"      }, 0x33},
 105         { {0x34, "ARC 700 R4.10"}, 0x34},
 106         { {0x00, NULL           } }
 107 };
 108
 109 char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 110 {
 111         int n = 0;
 112         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 113         struct bcr_identity *core = &cpu->core;
 114         const struct cpuinfo_data *tbl;
 115         int be = 0;
 116 #ifdef CONFIG_CPU_BIG_ENDIAN
 117         be = 1;
 118 #endif
 119         FIX_PTR(cpu);
 120
 121         n += scnprintf(buf + n, len - n,
 122                        "\nARC IDENTITY\t: Family [%#02x]"
 123                        " Cpu-id [%#02x] Chip-id [%#4x]\n",
 124                        core->family, core->cpu_id,
 125                        core->chip_id);
 126
 127         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
 128                 if ((core->family >= tbl->info.id) &&
 129                     (core->family <= tbl->up_range)) {
 130                         n += scnprintf(buf + n, len - n,
 131                                        "processor\t: %s %s\n",
 132                                        tbl->info.str,
 133                                        be ? "[Big Endian]" : "");
 134                         break;
 135                 }
 136         }
 137
 138         if (tbl->info.id == 0)
 139                 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
 140
 141         n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
 142                        (unsigned int)(arc_get_core_freq() / 1000000),
 143                        (unsigned int)(arc_get_core_freq() / 10000) % 100);
 144
 145         n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n",
 146                        (cpu->timers & 0x200) ? "TIMER1" : "",
 147                        (cpu->timers & 0x100) ? "TIMER0" : "");
 148
 149         n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n",
 150                        cpu->vec_base);
 151
 152         n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n",
 153                        cpu->uncached_base);
 154
 155         return buf;
 156 }
 157
 158 static const struct id_to_str mul_type_nm[] = {
 159         { 0x0, "N/A"},
 160         { 0x1, "32x32 (spl Result Reg)" },
 161         { 0x2, "32x32 (ANY Result Reg)" }
 162 };
 163
 164 static const struct id_to_str mac_mul_nm[] = {
 165         {0x0, "N/A"},
 166         {0x1, "N/A"},
 167         {0x2, "Dual 16 x 16"},
 168         {0x3, "N/A"},
 169         {0x4, "32x16"},
 170         {0x5, "N/A"},
 171         {0x6, "Dual 16x16 and 32x16"}
 172 };
 173
 174 char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 175 {
 176         int n = 0;
 177         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 178
 179         FIX_PTR(cpu);
 180 #define IS_AVAIL1(var, str)     ((var) ? str : "")
 181 #define IS_AVAIL2(var, str)     ((var == 0x2) ? str : "")
 182 #define IS_USED(cfg)            (IS_ENABLED(cfg) ? "(in-use)" : "(not used)")
 183
 184         n += scnprintf(buf + n, len - n,
 185                        "Extn [700-Base]\t: %s %s %s %s %s %s\n",
 186                        IS_AVAIL2(cpu->extn.norm, "norm,"),
 187                        IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"),
 188                        IS_AVAIL1(cpu->extn.swap, "swap,"),
 189                        IS_AVAIL2(cpu->extn.minmax, "minmax,"),
 190                        IS_AVAIL1(cpu->extn.crc, "crc,"),
 191                        IS_AVAIL2(cpu->extn.ext_arith, "ext-arith"));
 192
 193         n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s",
 194                        mul_type_nm[cpu->extn.mul].str);
 195
 196         n += scnprintf(buf + n, len - n, "   MAC MPY: %s\n",
 197                        mac_mul_nm[cpu->extn_mac_mul.type].str);
 198
 199         if (cpu->core.family == 0x34) {
 200                 n += scnprintf(buf + n, len - n,
 201                 "Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n",
 202                                IS_USED(CONFIG_ARC_HAS_LLSC),
 203                                IS_USED(CONFIG_ARC_HAS_SWAPE),
 204                                IS_USED(CONFIG_ARC_HAS_RTSC));
 205         }
 206
 207         n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s",
 208                        !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : "");
 209
 210         if (cpu->dccm.sz)
 211                 n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ",
 212                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz));
 213
 214         if (cpu->iccm.sz)
 215                 n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB",
 216                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
 217
 218         n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s",
 219                        !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : "");
 220
 221         if (cpu->fp.ver)
 222                 n += scnprintf(buf + n, len - n, "SP [v%d] %s",
 223                                cpu->fp.ver, cpu->fp.fast ? "(fast)" : "");
 224
 225         if (cpu->dpfp.ver)
 226                 n += scnprintf(buf + n, len - n, "DP [v%d] %s",
 227                                cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : "");
 228
 229         n += scnprintf(buf + n, len - n, "\n");
 230
 231         n += scnprintf(buf + n, len - n,
 232                        "OS ABI [v3]\t: no-legacy-syscalls\n");
 233
 234         return buf;
 235 }
 236
 237 void arc_chk_ccms(void)
 238 {
 239 #if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM)
 240         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 241
 242 #ifdef CONFIG_ARC_HAS_DCCM
 243         /*
 244          * DCCM can be arbit placed in hardware.
 245          * Make sure it's placement/sz matches what Linux is built with
 246          */
 247         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
 248                 panic("Linux built with incorrect DCCM Base address\n");
 249
 250         if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
 251                 panic("Linux built with incorrect DCCM Size\n");
 252 #endif
 253
 254 #ifdef CONFIG_ARC_HAS_ICCM
 255         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
 256                 panic("Linux built with incorrect ICCM Size\n");
 257 #endif
 258 #endif
 259 }
 260
 261 /*
 262  * Ensure that FP hardware and kernel config match
 263  * -If hardware contains DPFP, kernel needs to save/restore FPU state
 264  *  across context switches
 265  * -If hardware lacks DPFP, but kernel configured to save FPU state then
 266  *  kernel trying to access non-existant DPFP regs will crash
 267  *
 268  * We only check for Dbl precision Floating Point, because only DPFP
 269  * hardware has dedicated regs which need to be saved/restored on ctx-sw
 270  * (Single Precision uses core regs), thus kernel is kind of oblivious to it
 271  */
 272 void arc_chk_fpu(void)
 273 {
 274         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 275
 276         if (cpu->dpfp.ver) {
 277 #ifndef CONFIG_ARC_FPU_SAVE_RESTORE
 278                 pr_warn("DPFP support broken in this kernel...\n");
 279 #endif
 280         } else {
 281 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE
 282                 panic("H/w lacks DPFP support, apps won't work\n");
 283 #endif
 284         }
 285 }
 286
 287 /*
 288  * Initialize and setup the processor core
 289  * This is called by all the CPUs thus should not do special case stuff
 290  *    such as only for boot CPU etc
 291  */
 292
 293 void setup_processor(void)
 294 {
 295         char str[512];
 296         int cpu_id = smp_processor_id();
 297
 298         read_arc_build_cfg_regs();
 299         arc_init_IRQ();
 300
 301         printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
 302
 303         arc_mmu_init();
 304         arc_cache_init();
 305         arc_chk_ccms();
 306
 307         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
 308
 309 #ifdef CONFIG_SMP
 310         printk(arc_platform_smp_cpuinfo());
 311 #endif
 312
 313         arc_chk_fpu();
 314 }
 315
 316 void __init setup_arch(char **cmdline_p)
 317 {
 318         /* This also populates @boot_command_line from /bootargs */
 319         machine_desc = setup_machine_fdt(__dtb_start);
 320         if (!machine_desc)
 321                 panic("Embedded DT invalid\n");
 322
 323         /* Append any u-boot provided cmdline */
 324 #ifdef CONFIG_CMDLINE_UBOOT
 325         /* Add a whitespace seperator between the 2 cmdlines */
 326         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 327         strlcat(boot_command_line, command_line, COMMAND_LINE_SIZE);
 328 #endif
 329
 330         /* Save unparsed command line copy for /proc/cmdline */
 331         *cmdline_p = boot_command_line;
 332
 333         /* To force early parsing of things like mem=xxx */
 334         parse_early_param();
 335
 336         /* Platform/board specific: e.g. early console registration */
 337         if (machine_desc->init_early)
 338                 machine_desc->init_early();
 339
 340         setup_processor();
 341
 342 #ifdef CONFIG_SMP
 343         smp_init_cpus();
 344 #endif
 345
 346         setup_arch_memory();
 347
 348         /* copy flat DT out of .init and then unflatten it */
 349         copy_devtree();
 350         unflatten_device_tree();
 351
 352         /* Can be issue if someone passes cmd line arg "ro"
 353          * But that is unlikely so keeping it as it is
 354          */
 355         root_mountflags &= ~MS_RDONLY;
 356
 357 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
 358         conswitchp = &dummy_con;
 359 #endif
 360
 361         arc_unwind_init();
 362         arc_unwind_setup();
 363 }
 364
 365 static int __init customize_machine(void)
 366 {
 367         /* Add platform devices */
 368         if (machine_desc->init_machine)
 369                 machine_desc->init_machine();
 370
 371         return 0;
 372 }
 373 arch_initcall(customize_machine);
 374
 375 static int __init init_late_machine(void)
 376 {
 377         if (machine_desc->init_late)
 378                 machine_desc->init_late();
 379
 380         return 0;
 381 }
 382 late_initcall(init_late_machine);
 383 /*
 384  *  Get CPU information for use by the procfs.
 385  */
 386
 387 #define cpu_to_ptr(c)   ((void *)(0xFFFF0000 | (unsigned int)(c)))
 388 #define ptr_to_cpu(p)   (~0xFFFF0000UL & (unsigned int)(p))
 389
 390 static int show_cpuinfo(struct seq_file *m, void *v)
 391 {
 392         char *str;
 393         int cpu_id = ptr_to_cpu(v);
 394
 395         str = (char *)__get_free_page(GFP_TEMPORARY);
 396         if (!str)
 397                 goto done;
 398
 399         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 400
 401         seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
 402                    loops_per_jiffy / (500000 / HZ),
 403                    (loops_per_jiffy / (5000 / HZ)) % 100);
 404
 405         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 406
 407         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
 408
 409         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
 410
 411 #ifdef CONFIG_SMP
 412         seq_printf(m, arc_platform_smp_cpuinfo());
 413 #endif
 414
 415         free_page((unsigned long)str);
 416 done:
 417         seq_printf(m, "\n\n");
 418
 419         return 0;
 420 }
 421
 422 static void *c_start(struct seq_file *m, loff_t *pos)
 423 {
 424         /*
 425          * Callback returns cpu-id to iterator for show routine, NULL to stop.
 426          * However since NULL is also a valid cpu-id (0), we use a round-about
 427          * way to pass it w/o having to kmalloc/free a 2 byte string.
 428          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
 429          */
 430         return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
 431 }
 432
 433 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 434 {
 435         ++*pos;
 436         return c_start(m, pos);
 437 }
 438
 439 static void c_stop(struct seq_file *m, void *v)
 440 {
 441 }
 442
 443 const struct seq_operations cpuinfo_op = {
 444         .start  = c_start,
 445         .next   = c_next,
 446         .stop   = c_stop,
 447         .show   = show_cpuinfo
 448 };
 449
 450 static DEFINE_PER_CPU(struct cpu, cpu_topology);
 451
 452 static int __init topology_init(void)
 453 {
 454         int cpu;
 455
 456         for_each_present_cpu(cpu)
 457             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
 458
 459         return 0;
 460 }
 461
 462 subsys_initcall(topology_init);