arch/loongarch/kernel/setup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   4  *
   5  * Derived from MIPS:
   6  * Copyright (C) 1995 Linus Torvalds
   7  * Copyright (C) 1995 Waldorf Electronics
   8  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03  Ralf Baechle
   9  * Copyright (C) 1996 Stoned Elipot
  10  * Copyright (C) 1999 Silicon Graphics, Inc.
  11  * Copyright (C) 2000, 2001, 2002, 2007  Maciej W. Rozycki
  12  */
  13 #include <linux/init.h>
  14 #include <linux/acpi.h>
  15 #include <linux/cpu.h>
  16 #include <linux/dmi.h>
  17 #include <linux/efi.h>
  18 #include <linux/export.h>
  19 #include <linux/screen_info.h>
  20 #include <linux/memblock.h>
  21 #include <linux/initrd.h>
  22 #include <linux/ioport.h>
  23 #include <linux/kexec.h>
  24 #include <linux/crash_dump.h>
  25 #include <linux/root_dev.h>
  26 #include <linux/console.h>
  27 #include <linux/pfn.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/sizes.h>
  30 #include <linux/device.h>
  31 #include <linux/dma-map-ops.h>
  32 #include <linux/libfdt.h>
  33 #include <linux/of_fdt.h>
  34 #include <linux/of_address.h>
  35 #include <linux/suspend.h>
  36 #include <linux/swiotlb.h>
  37
  38 #include <asm/addrspace.h>
  39 #include <asm/alternative.h>
  40 #include <asm/bootinfo.h>
  41 #include <asm/cache.h>
  42 #include <asm/cpu.h>
  43 #include <asm/dma.h>
  44 #include <asm/efi.h>
  45 #include <asm/loongson.h>
  46 #include <asm/numa.h>
  47 #include <asm/pgalloc.h>
  48 #include <asm/sections.h>
  49 #include <asm/setup.h>
  50 #include <asm/time.h>
  51
  52 #define SMBIOS_BIOSSIZE_OFFSET          0x09
  53 #define SMBIOS_BIOSEXTERN_OFFSET        0x13
  54 #define SMBIOS_FREQLOW_OFFSET           0x16
  55 #define SMBIOS_FREQHIGH_OFFSET          0x17
  56 #define SMBIOS_FREQLOW_MASK             0xFF
  57 #define SMBIOS_CORE_PACKAGE_OFFSET      0x23
  58 #define LOONGSON_EFI_ENABLE             (1 << 3)
  59
  60 struct screen_info screen_info __section(".data");
  61
  62 unsigned long fw_arg0, fw_arg1, fw_arg2;
  63 DEFINE_PER_CPU(unsigned long, kernelsp);
  64 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;
  65
  66 EXPORT_SYMBOL(cpu_data);
  67
  68 struct loongson_board_info b_info;
  69 static const char dmi_empty_string[] = "        ";
  70
  71 /*
  72  * Setup information
  73  *
  74  * These are initialized so they are in the .data section
  75  */
  76 char init_command_line[COMMAND_LINE_SIZE] __initdata;
  77
  78 static int num_standard_resources;
  79 static struct resource *standard_resources;
  80
  81 static struct resource code_resource = { .name = "Kernel code", };
  82 static struct resource data_resource = { .name = "Kernel data", };
  83 static struct resource bss_resource  = { .name = "Kernel bss", };
  84
  85 const char *get_system_type(void)
  86 {
  87         return "generic-loongson-machine";
  88 }
  89
  90 void __init arch_cpu_finalize_init(void)
  91 {
  92         alternative_instructions();
  93 }
  94
  95 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s)
  96 {
  97         const u8 *bp = ((u8 *) dm) + dm->length;
  98
  99         if (s) {
 100                 s--;
 101                 while (s > 0 && *bp) {
 102                         bp += strlen(bp) + 1;
 103                         s--;
 104                 }
 105
 106                 if (*bp != 0) {
 107                         size_t len = strlen(bp)+1;
 108                         size_t cmp_len = len > 8 ? 8 : len;
 109
 110                         if (!memcmp(bp, dmi_empty_string, cmp_len))
 111                                 return dmi_empty_string;
 112
 113                         return bp;
 114                 }
 115         }
 116
 117         return "";
 118 }
 119
 120 static void __init parse_cpu_table(const struct dmi_header *dm)
 121 {
 122         long freq_temp = 0;
 123         char *dmi_data = (char *)dm;
 124
 125         freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) +
 126                         ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK));
 127         cpu_clock_freq = freq_temp * 1000000;
 128
 129         loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
 130         loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET);
 131
 132         pr_info("CpuClock = %llu\n", cpu_clock_freq);
 133 }
 134
 135 static void __init parse_bios_table(const struct dmi_header *dm)
 136 {
 137         char *dmi_data = (char *)dm;
 138
 139         b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6;
 140 }
 141
 142 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
 143 {
 144         switch (dm->type) {
 145         case 0x0: /* Extern BIOS */
 146                 parse_bios_table(dm);
 147                 break;
 148         case 0x4: /* Calling interface */
 149                 parse_cpu_table(dm);
 150                 break;
 151         }
 152 }
 153 static void __init smbios_parse(void)
 154 {
 155         b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR);
 156         b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION);
 157         b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE);
 158         b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR);
 159         b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME);
 160         dmi_walk(find_tokens, NULL);
 161 }
 162
 163 #ifdef CONFIG_ARCH_WRITECOMBINE
 164 pgprot_t pgprot_wc = PAGE_KERNEL_WUC;
 165 #else
 166 pgprot_t pgprot_wc = PAGE_KERNEL_SUC;
 167 #endif
 168
 169 EXPORT_SYMBOL(pgprot_wc);
 170
 171 static int __init setup_writecombine(char *p)
 172 {
 173         if (!strcmp(p, "on"))
 174                 pgprot_wc = PAGE_KERNEL_WUC;
 175         else if (!strcmp(p, "off"))
 176                 pgprot_wc = PAGE_KERNEL_SUC;
 177         else
 178                 pr_warn("Unknown writecombine setting \"%s\".\n", p);
 179
 180         return 0;
 181 }
 182 early_param("writecombine", setup_writecombine);
 183
 184 static int usermem __initdata;
 185
 186 static int __init early_parse_mem(char *p)
 187 {
 188         phys_addr_t start, size;
 189
 190         if (!p) {
 191                 pr_err("mem parameter is empty, do nothing\n");
 192                 return -EINVAL;
 193         }
 194
 195         /*
 196          * If a user specifies memory size, we
 197          * blow away any automatically generated
 198          * size.
 199          */
 200         if (usermem == 0) {
 201                 usermem = 1;
 202                 memblock_remove(memblock_start_of_DRAM(),
 203                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
 204         }
 205         start = 0;
 206         size = memparse(p, &p);
 207         if (*p == '@')
 208                 start = memparse(p + 1, &p);
 209         else {
 210                 pr_err("Invalid format!\n");
 211                 return -EINVAL;
 212         }
 213
 214         if (!IS_ENABLED(CONFIG_NUMA))
 215                 memblock_add(start, size);
 216         else
 217                 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
 218
 219         return 0;
 220 }
 221 early_param("mem", early_parse_mem);
 222
 223 static void __init arch_reserve_vmcore(void)
 224 {
 225 #ifdef CONFIG_PROC_VMCORE
 226         u64 i;
 227         phys_addr_t start, end;
 228
 229         if (!is_kdump_kernel())
 230                 return;
 231
 232         if (!elfcorehdr_size) {
 233                 for_each_mem_range(i, &start, &end) {
 234                         if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
 235                                 /*
 236                                  * Reserve from the elf core header to the end of
 237                                  * the memory segment, that should all be kdump
 238                                  * reserved memory.
 239                                  */
 240                                 elfcorehdr_size = end - elfcorehdr_addr;
 241                                 break;
 242                         }
 243                 }
 244         }
 245
 246         if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
 247                 pr_warn("elfcorehdr is overlapped\n");
 248                 return;
 249         }
 250
 251         memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
 252
 253         pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n",
 254                 elfcorehdr_size >> 10, elfcorehdr_addr);
 255 #endif
 256 }
 257
 258 /* 2MB alignment for crash kernel regions */
 259 #define CRASH_ALIGN     SZ_2M
 260 #define CRASH_ADDR_MAX  SZ_4G
 261
 262 static void __init arch_parse_crashkernel(void)
 263 {
 264 #ifdef CONFIG_KEXEC
 265         int ret;
 266         unsigned long long total_mem;
 267         unsigned long long crash_base, crash_size;
 268
 269         total_mem = memblock_phys_mem_size();
 270         ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
 271         if (ret < 0 || crash_size <= 0)
 272                 return;
 273
 274         if (crash_base <= 0) {
 275                 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, CRASH_ALIGN, CRASH_ADDR_MAX);
 276                 if (!crash_base) {
 277                         pr_warn("crashkernel reservation failed - No suitable area found.\n");
 278                         return;
 279                 }
 280         } else if (!memblock_phys_alloc_range(crash_size, CRASH_ALIGN, crash_base, crash_base + crash_size)) {
 281                 pr_warn("Invalid memory region reserved for crash kernel\n");
 282                 return;
 283         }
 284
 285         crashk_res.start = crash_base;
 286         crashk_res.end   = crash_base + crash_size - 1;
 287 #endif
 288 }
 289
 290 static void __init fdt_setup(void)
 291 {
 292 #ifdef CONFIG_OF_EARLY_FLATTREE
 293         void *fdt_pointer;
 294
 295         /* ACPI-based systems do not require parsing fdt */
 296         if (acpi_os_get_root_pointer())
 297                 return;
 298
 299         /* Look for a device tree configuration table entry */
 300         fdt_pointer = efi_fdt_pointer();
 301         if (!fdt_pointer || fdt_check_header(fdt_pointer))
 302                 return;
 303
 304         early_init_dt_scan(fdt_pointer);
 305         early_init_fdt_reserve_self();
 306
 307         max_low_pfn = PFN_PHYS(memblock_end_of_DRAM());
 308 #endif
 309 }
 310
 311 static void __init bootcmdline_init(char **cmdline_p)
 312 {
 313         /*
 314          * If CONFIG_CMDLINE_FORCE is enabled then initializing the command line
 315          * is trivial - we simply use the built-in command line unconditionally &
 316          * unmodified.
 317          */
 318         if (IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
 319                 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 320                 goto out;
 321         }
 322
 323 #ifdef CONFIG_OF_FLATTREE
 324         /*
 325          * If CONFIG_CMDLINE_BOOTLOADER is enabled and we are in FDT-based system,
 326          * the boot_command_line will be overwritten by early_init_dt_scan_chosen().
 327          * So we need to append init_command_line (the original copy of boot_command_line)
 328          * to boot_command_line.
 329          */
 330         if (initial_boot_params) {
 331                 if (boot_command_line[0])
 332                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 333
 334                 strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);
 335                 goto out;
 336         }
 337 #endif
 338
 339         /*
 340          * Append built-in command line to the bootloader command line if
 341          * CONFIG_CMDLINE_EXTEND is enabled.
 342          */
 343         if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
 344                 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 345                 strlcat(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 346         }
 347
 348         /*
 349          * Use built-in command line if the bootloader command line is empty.
 350          */
 351         if (IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && !boot_command_line[0])
 352                 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 353
 354 out:
 355         *cmdline_p = boot_command_line;
 356 }
 357
 358 void __init platform_init(void)
 359 {
 360         arch_reserve_vmcore();
 361         arch_parse_crashkernel();
 362
 363 #ifdef CONFIG_ACPI_TABLE_UPGRADE
 364         acpi_table_upgrade();
 365 #endif
 366 #ifdef CONFIG_ACPI
 367         acpi_gbl_use_default_register_widths = false;
 368         acpi_boot_table_init();
 369 #endif
 370         unflatten_and_copy_device_tree();
 371
 372 #ifdef CONFIG_NUMA
 373         init_numa_memory();
 374 #endif
 375         dmi_setup();
 376         smbios_parse();
 377         pr_info("The BIOS Version: %s\n", b_info.bios_version);
 378
 379         efi_runtime_init();
 380 }
 381
 382 static void __init check_kernel_sections_mem(void)
 383 {
 384         phys_addr_t start = __pa_symbol(&_text);
 385         phys_addr_t size = __pa_symbol(&_end) - start;
 386
 387         if (!memblock_is_region_memory(start, size)) {
 388                 pr_info("Kernel sections are not in the memory maps\n");
 389                 memblock_add(start, size);
 390         }
 391 }
 392
 393 /*
 394  * arch_mem_init - initialize memory management subsystem
 395  */
 396 static void __init arch_mem_init(char **cmdline_p)
 397 {
 398         if (usermem)
 399                 pr_info("User-defined physical RAM map overwrite\n");
 400
 401         check_kernel_sections_mem();
 402
 403         early_init_fdt_scan_reserved_mem();
 404
 405         /*
 406          * In order to reduce the possibility of kernel panic when failed to
 407          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
 408          * low memory as small as possible before swiotlb_init(), so make
 409          * sparse_init() using top-down allocation.
 410          */
 411         memblock_set_bottom_up(false);
 412         sparse_init();
 413         memblock_set_bottom_up(true);
 414
 415         swiotlb_init(true, SWIOTLB_VERBOSE);
 416
 417         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 418
 419         /* Reserve for hibernation. */
 420         register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)),
 421                                    PFN_UP(__pa_symbol(&__nosave_end)));
 422
 423         memblock_dump_all();
 424
 425         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 426 }
 427
 428 static void __init resource_init(void)
 429 {
 430         long i = 0;
 431         size_t res_size;
 432         struct resource *res;
 433         struct memblock_region *region;
 434
 435         code_resource.start = __pa_symbol(&_text);
 436         code_resource.end = __pa_symbol(&_etext) - 1;
 437         data_resource.start = __pa_symbol(&_etext);
 438         data_resource.end = __pa_symbol(&_edata) - 1;
 439         bss_resource.start = __pa_symbol(&__bss_start);
 440         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 441
 442         num_standard_resources = memblock.memory.cnt;
 443         res_size = num_standard_resources * sizeof(*standard_resources);
 444         standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
 445
 446         for_each_mem_region(region) {
 447                 res = &standard_resources[i++];
 448                 if (!memblock_is_nomap(region)) {
 449                         res->name  = "System RAM";
 450                         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 451                         res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 452                         res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 453                 } else {
 454                         res->name  = "Reserved";
 455                         res->flags = IORESOURCE_MEM;
 456                         res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
 457                         res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
 458                 }
 459
 460                 request_resource(&iomem_resource, res);
 461
 462                 /*
 463                  *  We don't know which RAM region contains kernel data,
 464                  *  so we try it repeatedly and let the resource manager
 465                  *  test it.
 466                  */
 467                 request_resource(res, &code_resource);
 468                 request_resource(res, &data_resource);
 469                 request_resource(res, &bss_resource);
 470         }
 471
 472 #ifdef CONFIG_KEXEC
 473         if (crashk_res.start < crashk_res.end) {
 474                 insert_resource(&iomem_resource, &crashk_res);
 475                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 476                         (unsigned long)((crashk_res.end - crashk_res.start + 1) >> 20),
 477                         (unsigned long)(crashk_res.start  >> 20));
 478         }
 479 #endif
 480 }
 481
 482 static int __init add_legacy_isa_io(struct fwnode_handle *fwnode,
 483                                 resource_size_t hw_start, resource_size_t size)
 484 {
 485         int ret = 0;
 486         unsigned long vaddr;
 487         struct logic_pio_hwaddr *range;
 488
 489         range = kzalloc(sizeof(*range), GFP_ATOMIC);
 490         if (!range)
 491                 return -ENOMEM;
 492
 493         range->fwnode = fwnode;
 494         range->size = size = round_up(size, PAGE_SIZE);
 495         range->hw_start = hw_start;
 496         range->flags = LOGIC_PIO_CPU_MMIO;
 497
 498         ret = logic_pio_register_range(range);
 499         if (ret) {
 500                 kfree(range);
 501                 return ret;
 502         }
 503
 504         /* Legacy ISA must placed at the start of PCI_IOBASE */
 505         if (range->io_start != 0) {
 506                 logic_pio_unregister_range(range);
 507                 kfree(range);
 508                 return -EINVAL;
 509         }
 510
 511         vaddr = (unsigned long)(PCI_IOBASE + range->io_start);
 512         ioremap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL));
 513
 514         return 0;
 515 }
 516
 517 static __init int arch_reserve_pio_range(void)
 518 {
 519         struct device_node *np;
 520
 521         for_each_node_by_name(np, "isa") {
 522                 struct of_range range;
 523                 struct of_range_parser parser;
 524
 525                 pr_info("ISA Bridge: %pOF\n", np);
 526
 527                 if (of_range_parser_init(&parser, np)) {
 528                         pr_info("Failed to parse resources.\n");
 529                         of_node_put(np);
 530                         break;
 531                 }
 532
 533                 for_each_of_range(&parser, &range) {
 534                         switch (range.flags & IORESOURCE_TYPE_BITS) {
 535                         case IORESOURCE_IO:
 536                                 pr_info(" IO 0x%016llx..0x%016llx  ->  0x%016llx\n",
 537                                         range.cpu_addr,
 538                                         range.cpu_addr + range.size - 1,
 539                                         range.bus_addr);
 540                                 if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size))
 541                                         pr_warn("Failed to reserve legacy IO in Logic PIO\n");
 542                                 break;
 543                         case IORESOURCE_MEM:
 544                                 pr_info(" MEM 0x%016llx..0x%016llx  ->  0x%016llx\n",
 545                                         range.cpu_addr,
 546                                         range.cpu_addr + range.size - 1,
 547                                         range.bus_addr);
 548                                 break;
 549                         }
 550                 }
 551         }
 552
 553         return 0;
 554 }
 555 arch_initcall(arch_reserve_pio_range);
 556
 557 static int __init reserve_memblock_reserved_regions(void)
 558 {
 559         u64 i, j;
 560
 561         for (i = 0; i < num_standard_resources; ++i) {
 562                 struct resource *mem = &standard_resources[i];
 563                 phys_addr_t r_start, r_end, mem_size = resource_size(mem);
 564
 565                 if (!memblock_is_region_reserved(mem->start, mem_size))
 566                         continue;
 567
 568                 for_each_reserved_mem_range(j, &r_start, &r_end) {
 569                         resource_size_t start, end;
 570
 571                         start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
 572                         end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
 573
 574                         if (start > mem->end || end < mem->start)
 575                                 continue;
 576
 577                         reserve_region_with_split(mem, start, end, "Reserved");
 578                 }
 579         }
 580
 581         return 0;
 582 }
 583 arch_initcall(reserve_memblock_reserved_regions);
 584
 585 #ifdef CONFIG_SMP
 586 static void __init prefill_possible_map(void)
 587 {
 588         int i, possible;
 589
 590         possible = num_processors + disabled_cpus;
 591         if (possible > nr_cpu_ids)
 592                 possible = nr_cpu_ids;
 593
 594         pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 595                         possible, max((possible - num_processors), 0));
 596
 597         for (i = 0; i < possible; i++)
 598                 set_cpu_possible(i, true);
 599         for (; i < NR_CPUS; i++)
 600                 set_cpu_possible(i, false);
 601
 602         set_nr_cpu_ids(possible);
 603 }
 604 #endif
 605
 606 void __init setup_arch(char **cmdline_p)
 607 {
 608         cpu_probe();
 609
 610         init_environ();
 611         efi_init();
 612         fdt_setup();
 613         memblock_init();
 614         pagetable_init();
 615         bootcmdline_init(cmdline_p);
 616         parse_early_param();
 617         reserve_initrd_mem();
 618
 619         platform_init();
 620         arch_mem_init(cmdline_p);
 621
 622         resource_init();
 623 #ifdef CONFIG_SMP
 624         plat_smp_setup();
 625         prefill_possible_map();
 626 #endif
 627
 628         paging_init();
 629 }