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/dmi.h> 16 #include <linux/efi.h> 17 #include <linux/export.h> 18 #include <linux/screen_info.h> 19 #include <linux/memblock.h> 20 #include <linux/initrd.h> 21 #include <linux/ioport.h> 22 #include <linux/kexec.h> 23 #include <linux/crash_dump.h> 24 #include <linux/root_dev.h> 25 #include <linux/console.h> 26 #include <linux/pfn.h> 27 #include <linux/platform_device.h> 28 #include <linux/sizes.h> 29 #include <linux/device.h> 30 #include <linux/dma-map-ops.h> 31 #include <linux/libfdt.h> 32 #include <linux/of_fdt.h> 33 #include <linux/of_address.h> 34 #include <linux/suspend.h> 35 #include <linux/swiotlb.h> 36 37 #include <asm/addrspace.h> 38 #include <asm/alternative.h> 39 #include <asm/bootinfo.h> 40 #include <asm/bugs.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 check_bugs(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 } 336 #endif 337 338 out: 339 *cmdline_p = boot_command_line; 340 } 341 342 void __init platform_init(void) 343 { 344 arch_reserve_vmcore(); 345 arch_parse_crashkernel(); 346 347 #ifdef CONFIG_ACPI_TABLE_UPGRADE 348 acpi_table_upgrade(); 349 #endif 350 #ifdef CONFIG_ACPI 351 acpi_gbl_use_default_register_widths = false; 352 acpi_boot_table_init(); 353 #endif 354 unflatten_and_copy_device_tree(); 355 356 #ifdef CONFIG_NUMA 357 init_numa_memory(); 358 #endif 359 dmi_setup(); 360 smbios_parse(); 361 pr_info("The BIOS Version: %s\n", b_info.bios_version); 362 363 efi_runtime_init(); 364 } 365 366 static void __init check_kernel_sections_mem(void) 367 { 368 phys_addr_t start = __pa_symbol(&_text); 369 phys_addr_t size = __pa_symbol(&_end) - start; 370 371 if (!memblock_is_region_memory(start, size)) { 372 pr_info("Kernel sections are not in the memory maps\n"); 373 memblock_add(start, size); 374 } 375 } 376 377 /* 378 * arch_mem_init - initialize memory management subsystem 379 */ 380 static void __init arch_mem_init(char **cmdline_p) 381 { 382 if (usermem) 383 pr_info("User-defined physical RAM map overwrite\n"); 384 385 check_kernel_sections_mem(); 386 387 early_init_fdt_scan_reserved_mem(); 388 389 /* 390 * In order to reduce the possibility of kernel panic when failed to 391 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 392 * low memory as small as possible before swiotlb_init(), so make 393 * sparse_init() using top-down allocation. 394 */ 395 memblock_set_bottom_up(false); 396 sparse_init(); 397 memblock_set_bottom_up(true); 398 399 swiotlb_init(true, SWIOTLB_VERBOSE); 400 401 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 402 403 /* Reserve for hibernation. */ 404 register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)), 405 PFN_UP(__pa_symbol(&__nosave_end))); 406 407 memblock_dump_all(); 408 409 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 410 } 411 412 static void __init resource_init(void) 413 { 414 long i = 0; 415 size_t res_size; 416 struct resource *res; 417 struct memblock_region *region; 418 419 code_resource.start = __pa_symbol(&_text); 420 code_resource.end = __pa_symbol(&_etext) - 1; 421 data_resource.start = __pa_symbol(&_etext); 422 data_resource.end = __pa_symbol(&_edata) - 1; 423 bss_resource.start = __pa_symbol(&__bss_start); 424 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 425 426 num_standard_resources = memblock.memory.cnt; 427 res_size = num_standard_resources * sizeof(*standard_resources); 428 standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES); 429 430 for_each_mem_region(region) { 431 res = &standard_resources[i++]; 432 if (!memblock_is_nomap(region)) { 433 res->name = "System RAM"; 434 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 435 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 436 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 437 } else { 438 res->name = "Reserved"; 439 res->flags = IORESOURCE_MEM; 440 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); 441 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1; 442 } 443 444 request_resource(&iomem_resource, res); 445 446 /* 447 * We don't know which RAM region contains kernel data, 448 * so we try it repeatedly and let the resource manager 449 * test it. 450 */ 451 request_resource(res, &code_resource); 452 request_resource(res, &data_resource); 453 request_resource(res, &bss_resource); 454 } 455 456 #ifdef CONFIG_KEXEC 457 if (crashk_res.start < crashk_res.end) { 458 insert_resource(&iomem_resource, &crashk_res); 459 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 460 (unsigned long)((crashk_res.end - crashk_res.start + 1) >> 20), 461 (unsigned long)(crashk_res.start >> 20)); 462 } 463 #endif 464 } 465 466 static int __init add_legacy_isa_io(struct fwnode_handle *fwnode, 467 resource_size_t hw_start, resource_size_t size) 468 { 469 int ret = 0; 470 unsigned long vaddr; 471 struct logic_pio_hwaddr *range; 472 473 range = kzalloc(sizeof(*range), GFP_ATOMIC); 474 if (!range) 475 return -ENOMEM; 476 477 range->fwnode = fwnode; 478 range->size = size = round_up(size, PAGE_SIZE); 479 range->hw_start = hw_start; 480 range->flags = LOGIC_PIO_CPU_MMIO; 481 482 ret = logic_pio_register_range(range); 483 if (ret) { 484 kfree(range); 485 return ret; 486 } 487 488 /* Legacy ISA must placed at the start of PCI_IOBASE */ 489 if (range->io_start != 0) { 490 logic_pio_unregister_range(range); 491 kfree(range); 492 return -EINVAL; 493 } 494 495 vaddr = (unsigned long)(PCI_IOBASE + range->io_start); 496 ioremap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL)); 497 498 return 0; 499 } 500 501 static __init int arch_reserve_pio_range(void) 502 { 503 struct device_node *np; 504 505 for_each_node_by_name(np, "isa") { 506 struct of_range range; 507 struct of_range_parser parser; 508 509 pr_info("ISA Bridge: %pOF\n", np); 510 511 if (of_range_parser_init(&parser, np)) { 512 pr_info("Failed to parse resources.\n"); 513 of_node_put(np); 514 break; 515 } 516 517 for_each_of_range(&parser, &range) { 518 switch (range.flags & IORESOURCE_TYPE_BITS) { 519 case IORESOURCE_IO: 520 pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n", 521 range.cpu_addr, 522 range.cpu_addr + range.size - 1, 523 range.bus_addr); 524 if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size)) 525 pr_warn("Failed to reserve legacy IO in Logic PIO\n"); 526 break; 527 case IORESOURCE_MEM: 528 pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx\n", 529 range.cpu_addr, 530 range.cpu_addr + range.size - 1, 531 range.bus_addr); 532 break; 533 } 534 } 535 } 536 537 return 0; 538 } 539 arch_initcall(arch_reserve_pio_range); 540 541 static int __init reserve_memblock_reserved_regions(void) 542 { 543 u64 i, j; 544 545 for (i = 0; i < num_standard_resources; ++i) { 546 struct resource *mem = &standard_resources[i]; 547 phys_addr_t r_start, r_end, mem_size = resource_size(mem); 548 549 if (!memblock_is_region_reserved(mem->start, mem_size)) 550 continue; 551 552 for_each_reserved_mem_range(j, &r_start, &r_end) { 553 resource_size_t start, end; 554 555 start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start); 556 end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end); 557 558 if (start > mem->end || end < mem->start) 559 continue; 560 561 reserve_region_with_split(mem, start, end, "Reserved"); 562 } 563 } 564 565 return 0; 566 } 567 arch_initcall(reserve_memblock_reserved_regions); 568 569 #ifdef CONFIG_SMP 570 static void __init prefill_possible_map(void) 571 { 572 int i, possible; 573 574 possible = num_processors + disabled_cpus; 575 if (possible > nr_cpu_ids) 576 possible = nr_cpu_ids; 577 578 pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n", 579 possible, max((possible - num_processors), 0)); 580 581 for (i = 0; i < possible; i++) 582 set_cpu_possible(i, true); 583 for (; i < NR_CPUS; i++) 584 set_cpu_possible(i, false); 585 586 set_nr_cpu_ids(possible); 587 } 588 #endif 589 590 void __init setup_arch(char **cmdline_p) 591 { 592 cpu_probe(); 593 594 init_environ(); 595 efi_init(); 596 fdt_setup(); 597 memblock_init(); 598 pagetable_init(); 599 bootcmdline_init(cmdline_p); 600 parse_early_param(); 601 reserve_initrd_mem(); 602 603 platform_init(); 604 arch_mem_init(cmdline_p); 605 606 resource_init(); 607 #ifdef CONFIG_SMP 608 plat_smp_setup(); 609 prefill_possible_map(); 610 #endif 611 612 paging_init(); 613 } 614