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 cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
  47         FIX_PTR(cpu);
  48
  49         READ_BCR(AUX_IDENTITY, cpu->core);
  50
  51         cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR);
  52         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
  53
  54         READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
  55         cpu->uncached_base = uncached_space.start << 24;
  56
  57         cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR);
  58         cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR);
  59         cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR);
  60         cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR);
  61         cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR);
  62         READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul);
  63
  64         cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR);
  65         cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR);
  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         READ_BCR(ARC_REG_FP_BCR, cpu->fp);
 100         READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp);
 101 }
 102
 103 static const struct cpuinfo_data arc_cpu_tbl[] = {
 104         { {0x10, "ARCTangent A5"}, 0x1F},
 105         { {0x20, "ARC 600"      }, 0x2F},
 106         { {0x30, "ARC 700"      }, 0x33},
 107         { {0x34, "ARC 700 R4.10"}, 0x34},
 108         { {0x00, NULL           } }
 109 };
 110
 111 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 112 {
 113         int n = 0;
 114         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 115         struct bcr_identity *core = &cpu->core;
 116         const struct cpuinfo_data *tbl;
 117         int be = 0;
 118 #ifdef CONFIG_CPU_BIG_ENDIAN
 119         be = 1;
 120 #endif
 121         FIX_PTR(cpu);
 122
 123         n += scnprintf(buf + n, len - n,
 124                        "\nARC IDENTITY\t: Family [%#02x]"
 125                        " Cpu-id [%#02x] Chip-id [%#4x]\n",
 126                        core->family, core->cpu_id,
 127                        core->chip_id);
 128
 129         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
 130                 if ((core->family >= tbl->info.id) &&
 131                     (core->family <= tbl->up_range)) {
 132                         n += scnprintf(buf + n, len - n,
 133                                        "processor\t: %s %s\n",
 134                                        tbl->info.str,
 135                                        be ? "[Big Endian]" : "");
 136                         break;
 137                 }
 138         }
 139
 140         if (tbl->info.id == 0)
 141                 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
 142
 143         n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
 144                        (unsigned int)(arc_get_core_freq() / 1000000),
 145                        (unsigned int)(arc_get_core_freq() / 10000) % 100);
 146
 147         n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n",
 148                        (cpu->timers & 0x200) ? "TIMER1" : "",
 149                        (cpu->timers & 0x100) ? "TIMER0" : "");
 150
 151         n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n",
 152                        cpu->vec_base);
 153
 154         n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n",
 155                        cpu->uncached_base);
 156
 157         return buf;
 158 }
 159
 160 static const struct id_to_str mul_type_nm[] = {
 161         { 0x0, "N/A"},
 162         { 0x1, "32x32 (spl Result Reg)" },
 163         { 0x2, "32x32 (ANY Result Reg)" }
 164 };
 165
 166 static const struct id_to_str mac_mul_nm[] = {
 167         {0x0, "N/A"},
 168         {0x1, "N/A"},
 169         {0x2, "Dual 16 x 16"},
 170         {0x3, "N/A"},
 171         {0x4, "32x16"},
 172         {0x5, "N/A"},
 173         {0x6, "Dual 16x16 and 32x16"}
 174 };
 175
 176 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 177 {
 178         int n = 0;
 179         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 180
 181         FIX_PTR(cpu);
 182 #define IS_AVAIL1(var, str)     ((var) ? str : "")
 183 #define IS_AVAIL2(var, str)     ((var == 0x2) ? str : "")
 184 #define IS_USED(cfg)            (IS_ENABLED(cfg) ? "(in-use)" : "(not used)")
 185
 186         n += scnprintf(buf + n, len - n,
 187                        "Extn [700-Base]\t: %s %s %s %s %s %s\n",
 188                        IS_AVAIL2(cpu->extn.norm, "norm,"),
 189                        IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"),
 190                        IS_AVAIL1(cpu->extn.swap, "swap,"),
 191                        IS_AVAIL2(cpu->extn.minmax, "minmax,"),
 192                        IS_AVAIL1(cpu->extn.crc, "crc,"),
 193                        IS_AVAIL2(cpu->extn.ext_arith, "ext-arith"));
 194
 195         n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s",
 196                        mul_type_nm[cpu->extn.mul].str);
 197
 198         n += scnprintf(buf + n, len - n, "   MAC MPY: %s\n",
 199                        mac_mul_nm[cpu->extn_mac_mul.type].str);
 200
 201         if (cpu->core.family == 0x34) {
 202                 n += scnprintf(buf + n, len - n,
 203                 "Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n",
 204                                IS_USED(CONFIG_ARC_HAS_LLSC),
 205                                IS_USED(CONFIG_ARC_HAS_SWAPE),
 206                                IS_USED(CONFIG_ARC_HAS_RTSC));
 207         }
 208
 209         n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s",
 210                        !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : "");
 211
 212         if (cpu->dccm.sz)
 213                 n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ",
 214                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz));
 215
 216         if (cpu->iccm.sz)
 217                 n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB",
 218                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
 219
 220         n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s",
 221                        !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : "");
 222
 223         if (cpu->fp.ver)
 224                 n += scnprintf(buf + n, len - n, "SP [v%d] %s",
 225                                cpu->fp.ver, cpu->fp.fast ? "(fast)" : "");
 226
 227         if (cpu->dpfp.ver)
 228                 n += scnprintf(buf + n, len - n, "DP [v%d] %s",
 229                                cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : "");
 230
 231         n += scnprintf(buf + n, len - n, "\n");
 232
 233         n += scnprintf(buf + n, len - n,
 234                        "OS ABI [v3]\t: no-legacy-syscalls\n");
 235
 236         return buf;
 237 }
 238
 239 static void arc_chk_core_config(void)
 240 {
 241         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 242         int fpu_enabled;
 243
 244 #ifdef CONFIG_ARC_HAS_DCCM
 245         /*
 246          * DCCM can be arbit placed in hardware.
 247          * Make sure it's placement/sz matches what Linux is built with
 248          */
 249         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
 250                 panic("Linux built with incorrect DCCM Base address\n");
 251
 252         if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
 253                 panic("Linux built with incorrect DCCM Size\n");
 254 #endif
 255
 256 #ifdef CONFIG_ARC_HAS_ICCM
 257         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
 258                 panic("Linux built with incorrect ICCM Size\n");
 259 #endif
 260
 261         /*
 262          * FP hardware/software config sanity
 263          * -If hardware contains DPFP, kernel needs to save/restore FPU state
 264          * -If not, it will crash trying to save/restore the non-existant regs
 265          *
 266          * (only DPDP checked since SP has no arch visible regs)
 267          */
 268         fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
 269
 270         if (cpu->dpfp.ver && !fpu_enabled)
 271                 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
 272         else if (!cpu->dpfp.ver && fpu_enabled)
 273                 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
 274 }
 275
 276 /*
 277  * Initialize and setup the processor core
 278  * This is called by all the CPUs thus should not do special case stuff
 279  *    such as only for boot CPU etc
 280  */
 281
 282 void setup_processor(void)
 283 {
 284         char str[512];
 285         int cpu_id = smp_processor_id();
 286
 287         read_arc_build_cfg_regs();
 288         arc_init_IRQ();
 289
 290         printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
 291
 292         arc_mmu_init();
 293         arc_cache_init();
 294
 295         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
 296         printk(arc_platform_smp_cpuinfo());
 297
 298         arc_chk_core_config();
 299 }
 300
 301 static inline int is_kernel(unsigned long addr)
 302 {
 303         if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
 304                 return 1;
 305         return 0;
 306 }
 307
 308 void __init setup_arch(char **cmdline_p)
 309 {
 310         /* make sure that uboot passed pointer to cmdline/dtb is valid */
 311         if (uboot_tag && is_kernel((unsigned long)uboot_arg))
 312                 panic("Invalid uboot arg\n");
 313
 314         /* See if u-boot passed an external Device Tree blob */
 315         machine_desc = setup_machine_fdt(uboot_arg);    /* uboot_tag == 2 */
 316         if (!machine_desc) {
 317                 /* No, so try the embedded one */
 318                 machine_desc = setup_machine_fdt(__dtb_start);
 319                 if (!machine_desc)
 320                         panic("Embedded DT invalid\n");
 321
 322                 /*
 323                  * If we are here, it is established that @uboot_arg didn't
 324                  * point to DT blob. Instead if u-boot says it is cmdline,
 325                  * Appent to embedded DT cmdline.
 326                  * setup_machine_fdt() would have populated @boot_command_line
 327                  */
 328                 if (uboot_tag == 1) {
 329                         /* Ensure a whitespace between the 2 cmdlines */
 330                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 331                         strlcat(boot_command_line, uboot_arg,
 332                                 COMMAND_LINE_SIZE);
 333                 }
 334         }
 335
 336         /* Save unparsed command line copy for /proc/cmdline */
 337         *cmdline_p = boot_command_line;
 338
 339         /* To force early parsing of things like mem=xxx */
 340         parse_early_param();
 341
 342         /* Platform/board specific: e.g. early console registration */
 343         if (machine_desc->init_early)
 344                 machine_desc->init_early();
 345
 346         setup_processor();
 347         smp_init_cpus();
 348         setup_arch_memory();
 349
 350         /* copy flat DT out of .init and then unflatten it */
 351         unflatten_and_copy_device_tree();
 352
 353         /* Can be issue if someone passes cmd line arg "ro"
 354          * But that is unlikely so keeping it as it is
 355          */
 356         root_mountflags &= ~MS_RDONLY;
 357
 358 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
 359         conswitchp = &dummy_con;
 360 #endif
 361
 362         arc_unwind_init();
 363         arc_unwind_setup();
 364 }
 365
 366 static int __init customize_machine(void)
 367 {
 368         of_clk_init(NULL);
 369         /*
 370          * Traverses flattened DeviceTree - registering platform devices
 371          * (if any) complete with their resources
 372          */
 373         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 374
 375         if (machine_desc->init_machine)
 376                 machine_desc->init_machine();
 377
 378         return 0;
 379 }
 380 arch_initcall(customize_machine);
 381
 382 static int __init init_late_machine(void)
 383 {
 384         if (machine_desc->init_late)
 385                 machine_desc->init_late();
 386
 387         return 0;
 388 }
 389 late_initcall(init_late_machine);
 390 /*
 391  *  Get CPU information for use by the procfs.
 392  */
 393
 394 #define cpu_to_ptr(c)   ((void *)(0xFFFF0000 | (unsigned int)(c)))
 395 #define ptr_to_cpu(p)   (~0xFFFF0000UL & (unsigned int)(p))
 396
 397 static int show_cpuinfo(struct seq_file *m, void *v)
 398 {
 399         char *str;
 400         int cpu_id = ptr_to_cpu(v);
 401
 402         str = (char *)__get_free_page(GFP_TEMPORARY);
 403         if (!str)
 404                 goto done;
 405
 406         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 407
 408         seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
 409                    loops_per_jiffy / (500000 / HZ),
 410                    (loops_per_jiffy / (5000 / HZ)) % 100);
 411
 412         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 413         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
 414         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
 415         seq_printf(m, arc_platform_smp_cpuinfo());
 416
 417         free_page((unsigned long)str);
 418 done:
 419         seq_printf(m, "\n\n");
 420
 421         return 0;
 422 }
 423
 424 static void *c_start(struct seq_file *m, loff_t *pos)
 425 {
 426         /*
 427          * Callback returns cpu-id to iterator for show routine, NULL to stop.
 428          * However since NULL is also a valid cpu-id (0), we use a round-about
 429          * way to pass it w/o having to kmalloc/free a 2 byte string.
 430          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
 431          */
 432         return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
 433 }
 434
 435 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 436 {
 437         ++*pos;
 438         return c_start(m, pos);
 439 }
 440
 441 static void c_stop(struct seq_file *m, void *v)
 442 {
 443 }
 444
 445 const struct seq_operations cpuinfo_op = {
 446         .start  = c_start,
 447         .next   = c_next,
 448         .stop   = c_stop,
 449         .show   = show_cpuinfo
 450 };
 451
 452 static DEFINE_PER_CPU(struct cpu, cpu_topology);
 453
 454 static int __init topology_init(void)
 455 {
 456         int cpu;
 457
 458         for_each_present_cpu(cpu)
 459             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
 460
 461         return 0;
 462 }
 463
 464 subsys_initcall(topology_init);