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 SMBIOS_THREAD_PACKAGE_OFFSET 0x25 59 #define LOONGSON_EFI_ENABLE (1 << 3) 60 61 #ifdef CONFIG_EFI 62 struct screen_info screen_info __section(".data"); 63 #endif 64 65 unsigned long fw_arg0, fw_arg1, fw_arg2; 66 DEFINE_PER_CPU(unsigned long, kernelsp); 67 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly; 68 69 EXPORT_SYMBOL(cpu_data); 70 71 struct loongson_board_info b_info; 72 static const char dmi_empty_string[] = " "; 73 74 /* 75 * Setup information 76 * 77 * These are initialized so they are in the .data section 78 */ 79 char init_command_line[COMMAND_LINE_SIZE] __initdata; 80 81 static int num_standard_resources; 82 static struct resource *standard_resources; 83 84 static struct resource code_resource = { .name = "Kernel code", }; 85 static struct resource data_resource = { .name = "Kernel data", }; 86 static struct resource bss_resource = { .name = "Kernel bss", }; 87 88 const char *get_system_type(void) 89 { 90 return "generic-loongson-machine"; 91 } 92 93 void __init arch_cpu_finalize_init(void) 94 { 95 alternative_instructions(); 96 } 97 98 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s) 99 { 100 const u8 *bp = ((u8 *) dm) + dm->length; 101 102 if (s) { 103 s--; 104 while (s > 0 && *bp) { 105 bp += strlen(bp) + 1; 106 s--; 107 } 108 109 if (*bp != 0) { 110 size_t len = strlen(bp)+1; 111 size_t cmp_len = len > 8 ? 8 : len; 112 113 if (!memcmp(bp, dmi_empty_string, cmp_len)) 114 return dmi_empty_string; 115 116 return bp; 117 } 118 } 119 120 return ""; 121 } 122 123 static void __init parse_cpu_table(const struct dmi_header *dm) 124 { 125 long freq_temp = 0; 126 char *dmi_data = (char *)dm; 127 128 freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) + 129 ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK)); 130 cpu_clock_freq = freq_temp * 1000000; 131 132 loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]); 133 loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_THREAD_PACKAGE_OFFSET); 134 135 pr_info("CpuClock = %llu\n", cpu_clock_freq); 136 } 137 138 static void __init parse_bios_table(const struct dmi_header *dm) 139 { 140 char *dmi_data = (char *)dm; 141 142 b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6; 143 } 144 145 static void __init find_tokens(const struct dmi_header *dm, void *dummy) 146 { 147 switch (dm->type) { 148 case 0x0: /* Extern BIOS */ 149 parse_bios_table(dm); 150 break; 151 case 0x4: /* Calling interface */ 152 parse_cpu_table(dm); 153 break; 154 } 155 } 156 static void __init smbios_parse(void) 157 { 158 b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR); 159 b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION); 160 b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE); 161 b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR); 162 b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME); 163 dmi_walk(find_tokens, NULL); 164 } 165 166 #ifdef CONFIG_ARCH_WRITECOMBINE 167 bool wc_enabled = true; 168 #else 169 bool wc_enabled = false; 170 #endif 171 172 EXPORT_SYMBOL(wc_enabled); 173 174 static int __init setup_writecombine(char *p) 175 { 176 if (!strcmp(p, "on")) 177 wc_enabled = true; 178 else if (!strcmp(p, "off")) 179 wc_enabled = false; 180 else 181 pr_warn("Unknown writecombine setting \"%s\".\n", p); 182 183 return 0; 184 } 185 early_param("writecombine", setup_writecombine); 186 187 static int usermem __initdata; 188 189 static int __init early_parse_mem(char *p) 190 { 191 phys_addr_t start, size; 192 193 if (!p) { 194 pr_err("mem parameter is empty, do nothing\n"); 195 return -EINVAL; 196 } 197 198 /* 199 * If a user specifies memory size, we 200 * blow away any automatically generated 201 * size. 202 */ 203 if (usermem == 0) { 204 usermem = 1; 205 memblock_remove(memblock_start_of_DRAM(), 206 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 207 } 208 start = 0; 209 size = memparse(p, &p); 210 if (*p == '@') 211 start = memparse(p + 1, &p); 212 else { 213 pr_err("Invalid format!\n"); 214 return -EINVAL; 215 } 216 217 if (!IS_ENABLED(CONFIG_NUMA)) 218 memblock_add(start, size); 219 else 220 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE); 221 222 return 0; 223 } 224 early_param("mem", early_parse_mem); 225 226 static void __init arch_reserve_vmcore(void) 227 { 228 #ifdef CONFIG_PROC_VMCORE 229 u64 i; 230 phys_addr_t start, end; 231 232 if (!is_kdump_kernel()) 233 return; 234 235 if (!elfcorehdr_size) { 236 for_each_mem_range(i, &start, &end) { 237 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) { 238 /* 239 * Reserve from the elf core header to the end of 240 * the memory segment, that should all be kdump 241 * reserved memory. 242 */ 243 elfcorehdr_size = end - elfcorehdr_addr; 244 break; 245 } 246 } 247 } 248 249 if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) { 250 pr_warn("elfcorehdr is overlapped\n"); 251 return; 252 } 253 254 memblock_reserve(elfcorehdr_addr, elfcorehdr_size); 255 256 pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n", 257 elfcorehdr_size >> 10, elfcorehdr_addr); 258 #endif 259 } 260 261 /* 2MB alignment for crash kernel regions */ 262 #define CRASH_ALIGN SZ_2M 263 #define CRASH_ADDR_MAX SZ_4G 264 265 static void __init arch_parse_crashkernel(void) 266 { 267 #ifdef CONFIG_KEXEC 268 int ret; 269 unsigned long long total_mem; 270 unsigned long long crash_base, crash_size; 271 272 total_mem = memblock_phys_mem_size(); 273 ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base); 274 if (ret < 0 || crash_size <= 0) 275 return; 276 277 if (crash_base <= 0) { 278 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, CRASH_ALIGN, CRASH_ADDR_MAX); 279 if (!crash_base) { 280 pr_warn("crashkernel reservation failed - No suitable area found.\n"); 281 return; 282 } 283 } else if (!memblock_phys_alloc_range(crash_size, CRASH_ALIGN, crash_base, crash_base + crash_size)) { 284 pr_warn("Invalid memory region reserved for crash kernel\n"); 285 return; 286 } 287 288 crashk_res.start = crash_base; 289 crashk_res.end = crash_base + crash_size - 1; 290 #endif 291 } 292 293 static void __init fdt_setup(void) 294 { 295 #ifdef CONFIG_OF_EARLY_FLATTREE 296 void *fdt_pointer; 297 298 /* ACPI-based systems do not require parsing fdt */ 299 if (acpi_os_get_root_pointer()) 300 return; 301 302 /* Look for a device tree configuration table entry */ 303 fdt_pointer = efi_fdt_pointer(); 304 if (!fdt_pointer || fdt_check_header(fdt_pointer)) 305 return; 306 307 early_init_dt_scan(fdt_pointer, __pa(fdt_pointer)); 308 early_init_fdt_reserve_self(); 309 310 max_low_pfn = PFN_PHYS(memblock_end_of_DRAM()); 311 #endif 312 } 313 314 static void __init bootcmdline_init(char **cmdline_p) 315 { 316 /* 317 * If CONFIG_CMDLINE_FORCE is enabled then initializing the command line 318 * is trivial - we simply use the built-in command line unconditionally & 319 * unmodified. 320 */ 321 if (IS_ENABLED(CONFIG_CMDLINE_FORCE)) { 322 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); 323 goto out; 324 } 325 326 #ifdef CONFIG_OF_FLATTREE 327 /* 328 * If CONFIG_CMDLINE_BOOTLOADER is enabled and we are in FDT-based system, 329 * the boot_command_line will be overwritten by early_init_dt_scan_chosen(). 330 * So we need to append init_command_line (the original copy of boot_command_line) 331 * to boot_command_line. 332 */ 333 if (initial_boot_params) { 334 if (boot_command_line[0]) 335 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 336 337 strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE); 338 goto out; 339 } 340 #endif 341 342 /* 343 * Append built-in command line to the bootloader command line if 344 * CONFIG_CMDLINE_EXTEND is enabled. 345 */ 346 if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) { 347 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 348 strlcat(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); 349 } 350 351 /* 352 * Use built-in command line if the bootloader command line is empty. 353 */ 354 if (IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && !boot_command_line[0]) 355 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); 356 357 out: 358 *cmdline_p = boot_command_line; 359 } 360 361 void __init platform_init(void) 362 { 363 arch_reserve_vmcore(); 364 arch_parse_crashkernel(); 365 366 #ifdef CONFIG_ACPI_TABLE_UPGRADE 367 acpi_table_upgrade(); 368 #endif 369 #ifdef CONFIG_ACPI 370 acpi_gbl_use_default_register_widths = false; 371 acpi_boot_table_init(); 372 #endif 373 374 early_init_fdt_scan_reserved_mem(); 375 unflatten_and_copy_device_tree(); 376 377 #ifdef CONFIG_NUMA 378 init_numa_memory(); 379 #endif 380 dmi_setup(); 381 smbios_parse(); 382 pr_info("The BIOS Version: %s\n", b_info.bios_version); 383 384 efi_runtime_init(); 385 } 386 387 static void __init check_kernel_sections_mem(void) 388 { 389 phys_addr_t start = __pa_symbol(&_text); 390 phys_addr_t size = __pa_symbol(&_end) - start; 391 392 if (!memblock_is_region_memory(start, size)) { 393 pr_info("Kernel sections are not in the memory maps\n"); 394 memblock_add(start, size); 395 } 396 } 397 398 /* 399 * arch_mem_init - initialize memory management subsystem 400 */ 401 static void __init arch_mem_init(char **cmdline_p) 402 { 403 /* Recalculate max_low_pfn for "mem=xxx" */ 404 max_pfn = max_low_pfn = PHYS_PFN(memblock_end_of_DRAM()); 405 406 if (usermem) 407 pr_info("User-defined physical RAM map overwrite\n"); 408 409 check_kernel_sections_mem(); 410 411 /* 412 * In order to reduce the possibility of kernel panic when failed to 413 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 414 * low memory as small as possible before swiotlb_init(), so make 415 * sparse_init() using top-down allocation. 416 */ 417 memblock_set_bottom_up(false); 418 sparse_init(); 419 memblock_set_bottom_up(true); 420 421 swiotlb_init(true, SWIOTLB_VERBOSE); 422 423 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 424 425 /* Reserve for hibernation. */ 426 register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)), 427 PFN_UP(__pa_symbol(&__nosave_end))); 428 429 memblock_dump_all(); 430 431 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 432 } 433 434 static void __init resource_init(void) 435 { 436 long i = 0; 437 size_t res_size; 438 struct resource *res; 439 struct memblock_region *region; 440 441 code_resource.start = __pa_symbol(&_text); 442 code_resource.end = __pa_symbol(&_etext) - 1; 443 data_resource.start = __pa_symbol(&_etext); 444 data_resource.end = __pa_symbol(&_edata) - 1; 445 bss_resource.start = __pa_symbol(&__bss_start); 446 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 447 448 num_standard_resources = memblock.memory.cnt; 449 res_size = num_standard_resources * sizeof(*standard_resources); 450 standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES); 451 452 for_each_mem_region(region) { 453 res = &standard_resources[i++]; 454 if (!memblock_is_nomap(region)) { 455 res->name = "System RAM"; 456 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 457 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 458 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 459 } else { 460 res->name = "Reserved"; 461 res->flags = IORESOURCE_MEM; 462 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); 463 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1; 464 } 465 466 request_resource(&iomem_resource, res); 467 468 /* 469 * We don't know which RAM region contains kernel data, 470 * so we try it repeatedly and let the resource manager 471 * test it. 472 */ 473 request_resource(res, &code_resource); 474 request_resource(res, &data_resource); 475 request_resource(res, &bss_resource); 476 } 477 478 #ifdef CONFIG_KEXEC 479 if (crashk_res.start < crashk_res.end) { 480 insert_resource(&iomem_resource, &crashk_res); 481 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 482 (unsigned long)((crashk_res.end - crashk_res.start + 1) >> 20), 483 (unsigned long)(crashk_res.start >> 20)); 484 } 485 #endif 486 } 487 488 static int __init add_legacy_isa_io(struct fwnode_handle *fwnode, 489 resource_size_t hw_start, resource_size_t size) 490 { 491 int ret = 0; 492 unsigned long vaddr; 493 struct logic_pio_hwaddr *range; 494 495 range = kzalloc(sizeof(*range), GFP_ATOMIC); 496 if (!range) 497 return -ENOMEM; 498 499 range->fwnode = fwnode; 500 range->size = size = round_up(size, PAGE_SIZE); 501 range->hw_start = hw_start; 502 range->flags = LOGIC_PIO_CPU_MMIO; 503 504 ret = logic_pio_register_range(range); 505 if (ret) { 506 kfree(range); 507 return ret; 508 } 509 510 /* Legacy ISA must placed at the start of PCI_IOBASE */ 511 if (range->io_start != 0) { 512 logic_pio_unregister_range(range); 513 kfree(range); 514 return -EINVAL; 515 } 516 517 vaddr = (unsigned long)(PCI_IOBASE + range->io_start); 518 ioremap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL)); 519 520 return 0; 521 } 522 523 static __init int arch_reserve_pio_range(void) 524 { 525 struct device_node *np; 526 527 for_each_node_by_name(np, "isa") { 528 struct of_range range; 529 struct of_range_parser parser; 530 531 pr_info("ISA Bridge: %pOF\n", np); 532 533 if (of_range_parser_init(&parser, np)) { 534 pr_info("Failed to parse resources.\n"); 535 of_node_put(np); 536 break; 537 } 538 539 for_each_of_range(&parser, &range) { 540 switch (range.flags & IORESOURCE_TYPE_BITS) { 541 case IORESOURCE_IO: 542 pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n", 543 range.cpu_addr, 544 range.cpu_addr + range.size - 1, 545 range.bus_addr); 546 if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size)) 547 pr_warn("Failed to reserve legacy IO in Logic PIO\n"); 548 break; 549 case IORESOURCE_MEM: 550 pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx\n", 551 range.cpu_addr, 552 range.cpu_addr + range.size - 1, 553 range.bus_addr); 554 break; 555 } 556 } 557 } 558 559 return 0; 560 } 561 arch_initcall(arch_reserve_pio_range); 562 563 static int __init reserve_memblock_reserved_regions(void) 564 { 565 u64 i, j; 566 567 for (i = 0; i < num_standard_resources; ++i) { 568 struct resource *mem = &standard_resources[i]; 569 phys_addr_t r_start, r_end, mem_size = resource_size(mem); 570 571 if (!memblock_is_region_reserved(mem->start, mem_size)) 572 continue; 573 574 for_each_reserved_mem_range(j, &r_start, &r_end) { 575 resource_size_t start, end; 576 577 start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start); 578 end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end); 579 580 if (start > mem->end || end < mem->start) 581 continue; 582 583 reserve_region_with_split(mem, start, end, "Reserved"); 584 } 585 } 586 587 return 0; 588 } 589 arch_initcall(reserve_memblock_reserved_regions); 590 591 #ifdef CONFIG_SMP 592 static void __init prefill_possible_map(void) 593 { 594 int i, possible; 595 596 possible = num_processors + disabled_cpus; 597 if (possible > nr_cpu_ids) 598 possible = nr_cpu_ids; 599 600 pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n", 601 possible, max((possible - num_processors), 0)); 602 603 for (i = 0; i < possible; i++) 604 set_cpu_possible(i, true); 605 for (; i < NR_CPUS; i++) 606 set_cpu_possible(i, false); 607 608 set_nr_cpu_ids(possible); 609 } 610 #endif 611 612 void __init setup_arch(char **cmdline_p) 613 { 614 cpu_probe(); 615 616 init_environ(); 617 efi_init(); 618 fdt_setup(); 619 memblock_init(); 620 pagetable_init(); 621 bootcmdline_init(cmdline_p); 622 parse_early_param(); 623 reserve_initrd_mem(); 624 625 platform_init(); 626 arch_mem_init(cmdline_p); 627 628 resource_init(); 629 #ifdef CONFIG_SMP 630 plat_smp_setup(); 631 prefill_possible_map(); 632 #endif 633 634 paging_init(); 635 636 #ifdef CONFIG_KASAN 637 kasan_init(); 638 #endif 639 } 640