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