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 static int usermem __initdata; 164 165 static int __init early_parse_mem(char *p) 166 { 167 phys_addr_t start, size; 168 169 if (!p) { 170 pr_err("mem parameter is empty, do nothing\n"); 171 return -EINVAL; 172 } 173 174 /* 175 * If a user specifies memory size, we 176 * blow away any automatically generated 177 * size. 178 */ 179 if (usermem == 0) { 180 usermem = 1; 181 memblock_remove(memblock_start_of_DRAM(), 182 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 183 } 184 start = 0; 185 size = memparse(p, &p); 186 if (*p == '@') 187 start = memparse(p + 1, &p); 188 else { 189 pr_err("Invalid format!\n"); 190 return -EINVAL; 191 } 192 193 if (!IS_ENABLED(CONFIG_NUMA)) 194 memblock_add(start, size); 195 else 196 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE); 197 198 return 0; 199 } 200 early_param("mem", early_parse_mem); 201 202 static void __init arch_reserve_vmcore(void) 203 { 204 #ifdef CONFIG_PROC_VMCORE 205 u64 i; 206 phys_addr_t start, end; 207 208 if (!is_kdump_kernel()) 209 return; 210 211 if (!elfcorehdr_size) { 212 for_each_mem_range(i, &start, &end) { 213 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) { 214 /* 215 * Reserve from the elf core header to the end of 216 * the memory segment, that should all be kdump 217 * reserved memory. 218 */ 219 elfcorehdr_size = end - elfcorehdr_addr; 220 break; 221 } 222 } 223 } 224 225 if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) { 226 pr_warn("elfcorehdr is overlapped\n"); 227 return; 228 } 229 230 memblock_reserve(elfcorehdr_addr, elfcorehdr_size); 231 232 pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n", 233 elfcorehdr_size >> 10, elfcorehdr_addr); 234 #endif 235 } 236 237 static void __init arch_parse_crashkernel(void) 238 { 239 #ifdef CONFIG_KEXEC 240 int ret; 241 unsigned long long start; 242 unsigned long long total_mem; 243 unsigned long long crash_base, crash_size; 244 245 total_mem = memblock_phys_mem_size(); 246 ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base); 247 if (ret < 0 || crash_size <= 0) 248 return; 249 250 start = memblock_phys_alloc_range(crash_size, 1, crash_base, crash_base + crash_size); 251 if (start != crash_base) { 252 pr_warn("Invalid memory region reserved for crash kernel\n"); 253 return; 254 } 255 256 crashk_res.start = crash_base; 257 crashk_res.end = crash_base + crash_size - 1; 258 #endif 259 } 260 261 static void __init fdt_setup(void) 262 { 263 #ifdef CONFIG_OF_EARLY_FLATTREE 264 void *fdt_pointer; 265 266 /* ACPI-based systems do not require parsing fdt */ 267 if (acpi_os_get_root_pointer()) 268 return; 269 270 /* Look for a device tree configuration table entry */ 271 fdt_pointer = efi_fdt_pointer(); 272 if (!fdt_pointer || fdt_check_header(fdt_pointer)) 273 return; 274 275 early_init_dt_scan(fdt_pointer); 276 early_init_fdt_reserve_self(); 277 278 max_low_pfn = PFN_PHYS(memblock_end_of_DRAM()); 279 #endif 280 } 281 282 static void __init bootcmdline_init(char **cmdline_p) 283 { 284 /* 285 * If CONFIG_CMDLINE_FORCE is enabled then initializing the command line 286 * is trivial - we simply use the built-in command line unconditionally & 287 * unmodified. 288 */ 289 if (IS_ENABLED(CONFIG_CMDLINE_FORCE)) { 290 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); 291 goto out; 292 } 293 294 #ifdef CONFIG_OF_FLATTREE 295 /* 296 * If CONFIG_CMDLINE_BOOTLOADER is enabled and we are in FDT-based system, 297 * the boot_command_line will be overwritten by early_init_dt_scan_chosen(). 298 * So we need to append init_command_line (the original copy of boot_command_line) 299 * to boot_command_line. 300 */ 301 if (initial_boot_params) { 302 if (boot_command_line[0]) 303 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 304 305 strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE); 306 } 307 #endif 308 309 out: 310 *cmdline_p = boot_command_line; 311 } 312 313 void __init platform_init(void) 314 { 315 arch_reserve_vmcore(); 316 arch_parse_crashkernel(); 317 318 #ifdef CONFIG_ACPI_TABLE_UPGRADE 319 acpi_table_upgrade(); 320 #endif 321 #ifdef CONFIG_ACPI 322 acpi_gbl_use_default_register_widths = false; 323 acpi_boot_table_init(); 324 #endif 325 unflatten_and_copy_device_tree(); 326 327 #ifdef CONFIG_NUMA 328 init_numa_memory(); 329 #endif 330 dmi_setup(); 331 smbios_parse(); 332 pr_info("The BIOS Version: %s\n", b_info.bios_version); 333 334 efi_runtime_init(); 335 } 336 337 static void __init check_kernel_sections_mem(void) 338 { 339 phys_addr_t start = __pa_symbol(&_text); 340 phys_addr_t size = __pa_symbol(&_end) - start; 341 342 if (!memblock_is_region_memory(start, size)) { 343 pr_info("Kernel sections are not in the memory maps\n"); 344 memblock_add(start, size); 345 } 346 } 347 348 /* 349 * arch_mem_init - initialize memory management subsystem 350 */ 351 static void __init arch_mem_init(char **cmdline_p) 352 { 353 if (usermem) 354 pr_info("User-defined physical RAM map overwrite\n"); 355 356 check_kernel_sections_mem(); 357 358 early_init_fdt_scan_reserved_mem(); 359 360 /* 361 * In order to reduce the possibility of kernel panic when failed to 362 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 363 * low memory as small as possible before plat_swiotlb_setup(), so 364 * make sparse_init() using top-down allocation. 365 */ 366 memblock_set_bottom_up(false); 367 sparse_init(); 368 memblock_set_bottom_up(true); 369 370 swiotlb_init(true, SWIOTLB_VERBOSE); 371 372 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 373 374 /* Reserve for hibernation. */ 375 register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)), 376 PFN_UP(__pa_symbol(&__nosave_end))); 377 378 memblock_dump_all(); 379 380 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 381 } 382 383 static void __init resource_init(void) 384 { 385 long i = 0; 386 size_t res_size; 387 struct resource *res; 388 struct memblock_region *region; 389 390 code_resource.start = __pa_symbol(&_text); 391 code_resource.end = __pa_symbol(&_etext) - 1; 392 data_resource.start = __pa_symbol(&_etext); 393 data_resource.end = __pa_symbol(&_edata) - 1; 394 bss_resource.start = __pa_symbol(&__bss_start); 395 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 396 397 num_standard_resources = memblock.memory.cnt; 398 res_size = num_standard_resources * sizeof(*standard_resources); 399 standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES); 400 401 for_each_mem_region(region) { 402 res = &standard_resources[i++]; 403 if (!memblock_is_nomap(region)) { 404 res->name = "System RAM"; 405 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 406 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 407 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 408 } else { 409 res->name = "Reserved"; 410 res->flags = IORESOURCE_MEM; 411 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); 412 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1; 413 } 414 415 request_resource(&iomem_resource, res); 416 417 /* 418 * We don't know which RAM region contains kernel data, 419 * so we try it repeatedly and let the resource manager 420 * test it. 421 */ 422 request_resource(res, &code_resource); 423 request_resource(res, &data_resource); 424 request_resource(res, &bss_resource); 425 } 426 427 #ifdef CONFIG_KEXEC 428 if (crashk_res.start < crashk_res.end) { 429 insert_resource(&iomem_resource, &crashk_res); 430 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 431 (unsigned long)((crashk_res.end - crashk_res.start + 1) >> 20), 432 (unsigned long)(crashk_res.start >> 20)); 433 } 434 #endif 435 } 436 437 static int __init add_legacy_isa_io(struct fwnode_handle *fwnode, 438 resource_size_t hw_start, resource_size_t size) 439 { 440 int ret = 0; 441 unsigned long vaddr; 442 struct logic_pio_hwaddr *range; 443 444 range = kzalloc(sizeof(*range), GFP_ATOMIC); 445 if (!range) 446 return -ENOMEM; 447 448 range->fwnode = fwnode; 449 range->size = size = round_up(size, PAGE_SIZE); 450 range->hw_start = hw_start; 451 range->flags = LOGIC_PIO_CPU_MMIO; 452 453 ret = logic_pio_register_range(range); 454 if (ret) { 455 kfree(range); 456 return ret; 457 } 458 459 /* Legacy ISA must placed at the start of PCI_IOBASE */ 460 if (range->io_start != 0) { 461 logic_pio_unregister_range(range); 462 kfree(range); 463 return -EINVAL; 464 } 465 466 vaddr = (unsigned long)(PCI_IOBASE + range->io_start); 467 ioremap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL)); 468 469 return 0; 470 } 471 472 static __init int arch_reserve_pio_range(void) 473 { 474 struct device_node *np; 475 476 for_each_node_by_name(np, "isa") { 477 struct of_range range; 478 struct of_range_parser parser; 479 480 pr_info("ISA Bridge: %pOF\n", np); 481 482 if (of_range_parser_init(&parser, np)) { 483 pr_info("Failed to parse resources.\n"); 484 of_node_put(np); 485 break; 486 } 487 488 for_each_of_range(&parser, &range) { 489 switch (range.flags & IORESOURCE_TYPE_BITS) { 490 case IORESOURCE_IO: 491 pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n", 492 range.cpu_addr, 493 range.cpu_addr + range.size - 1, 494 range.bus_addr); 495 if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size)) 496 pr_warn("Failed to reserve legacy IO in Logic PIO\n"); 497 break; 498 case IORESOURCE_MEM: 499 pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx\n", 500 range.cpu_addr, 501 range.cpu_addr + range.size - 1, 502 range.bus_addr); 503 break; 504 } 505 } 506 } 507 508 return 0; 509 } 510 arch_initcall(arch_reserve_pio_range); 511 512 static int __init reserve_memblock_reserved_regions(void) 513 { 514 u64 i, j; 515 516 for (i = 0; i < num_standard_resources; ++i) { 517 struct resource *mem = &standard_resources[i]; 518 phys_addr_t r_start, r_end, mem_size = resource_size(mem); 519 520 if (!memblock_is_region_reserved(mem->start, mem_size)) 521 continue; 522 523 for_each_reserved_mem_range(j, &r_start, &r_end) { 524 resource_size_t start, end; 525 526 start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start); 527 end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end); 528 529 if (start > mem->end || end < mem->start) 530 continue; 531 532 reserve_region_with_split(mem, start, end, "Reserved"); 533 } 534 } 535 536 return 0; 537 } 538 arch_initcall(reserve_memblock_reserved_regions); 539 540 #ifdef CONFIG_SMP 541 static void __init prefill_possible_map(void) 542 { 543 int i, possible; 544 545 possible = num_processors + disabled_cpus; 546 if (possible > nr_cpu_ids) 547 possible = nr_cpu_ids; 548 549 pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n", 550 possible, max((possible - num_processors), 0)); 551 552 for (i = 0; i < possible; i++) 553 set_cpu_possible(i, true); 554 for (; i < NR_CPUS; i++) 555 set_cpu_possible(i, false); 556 557 set_nr_cpu_ids(possible); 558 } 559 #endif 560 561 void __init setup_arch(char **cmdline_p) 562 { 563 cpu_probe(); 564 565 init_environ(); 566 efi_init(); 567 fdt_setup(); 568 memblock_init(); 569 pagetable_init(); 570 bootcmdline_init(cmdline_p); 571 parse_early_param(); 572 reserve_initrd_mem(); 573 574 platform_init(); 575 arch_mem_init(cmdline_p); 576 577 resource_init(); 578 #ifdef CONFIG_SMP 579 plat_smp_setup(); 580 prefill_possible_map(); 581 #endif 582 583 paging_init(); 584 } 585