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/root_dev.h> 23 #include <linux/console.h> 24 #include <linux/pfn.h> 25 #include <linux/platform_device.h> 26 #include <linux/sizes.h> 27 #include <linux/device.h> 28 #include <linux/dma-map-ops.h> 29 #include <linux/swiotlb.h> 30 31 #include <asm/addrspace.h> 32 #include <asm/bootinfo.h> 33 #include <asm/cache.h> 34 #include <asm/cpu.h> 35 #include <asm/dma.h> 36 #include <asm/efi.h> 37 #include <asm/loongson.h> 38 #include <asm/numa.h> 39 #include <asm/pgalloc.h> 40 #include <asm/sections.h> 41 #include <asm/setup.h> 42 #include <asm/time.h> 43 44 #define SMBIOS_BIOSSIZE_OFFSET 0x09 45 #define SMBIOS_BIOSEXTERN_OFFSET 0x13 46 #define SMBIOS_FREQLOW_OFFSET 0x16 47 #define SMBIOS_FREQHIGH_OFFSET 0x17 48 #define SMBIOS_FREQLOW_MASK 0xFF 49 #define SMBIOS_CORE_PACKAGE_OFFSET 0x23 50 #define LOONGSON_EFI_ENABLE (1 << 3) 51 52 struct screen_info screen_info __section(".data"); 53 54 unsigned long fw_arg0, fw_arg1, fw_arg2; 55 DEFINE_PER_CPU(unsigned long, kernelsp); 56 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly; 57 58 EXPORT_SYMBOL(cpu_data); 59 60 struct loongson_board_info b_info; 61 static const char dmi_empty_string[] = " "; 62 63 /* 64 * Setup information 65 * 66 * These are initialized so they are in the .data section 67 */ 68 69 static int num_standard_resources; 70 static struct resource *standard_resources; 71 72 static struct resource code_resource = { .name = "Kernel code", }; 73 static struct resource data_resource = { .name = "Kernel data", }; 74 static struct resource bss_resource = { .name = "Kernel bss", }; 75 76 const char *get_system_type(void) 77 { 78 return "generic-loongson-machine"; 79 } 80 81 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s) 82 { 83 const u8 *bp = ((u8 *) dm) + dm->length; 84 85 if (s) { 86 s--; 87 while (s > 0 && *bp) { 88 bp += strlen(bp) + 1; 89 s--; 90 } 91 92 if (*bp != 0) { 93 size_t len = strlen(bp)+1; 94 size_t cmp_len = len > 8 ? 8 : len; 95 96 if (!memcmp(bp, dmi_empty_string, cmp_len)) 97 return dmi_empty_string; 98 99 return bp; 100 } 101 } 102 103 return ""; 104 } 105 106 static void __init parse_cpu_table(const struct dmi_header *dm) 107 { 108 long freq_temp = 0; 109 char *dmi_data = (char *)dm; 110 111 freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) + 112 ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK)); 113 cpu_clock_freq = freq_temp * 1000000; 114 115 loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]); 116 loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET); 117 118 pr_info("CpuClock = %llu\n", cpu_clock_freq); 119 } 120 121 static void __init parse_bios_table(const struct dmi_header *dm) 122 { 123 char *dmi_data = (char *)dm; 124 125 b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6; 126 } 127 128 static void __init find_tokens(const struct dmi_header *dm, void *dummy) 129 { 130 switch (dm->type) { 131 case 0x0: /* Extern BIOS */ 132 parse_bios_table(dm); 133 break; 134 case 0x4: /* Calling interface */ 135 parse_cpu_table(dm); 136 break; 137 } 138 } 139 static void __init smbios_parse(void) 140 { 141 b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR); 142 b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION); 143 b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE); 144 b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR); 145 b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME); 146 dmi_walk(find_tokens, NULL); 147 } 148 149 static int usermem __initdata; 150 151 static int __init early_parse_mem(char *p) 152 { 153 phys_addr_t start, size; 154 155 if (!p) { 156 pr_err("mem parameter is empty, do nothing\n"); 157 return -EINVAL; 158 } 159 160 /* 161 * If a user specifies memory size, we 162 * blow away any automatically generated 163 * size. 164 */ 165 if (usermem == 0) { 166 usermem = 1; 167 memblock_remove(memblock_start_of_DRAM(), 168 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 169 } 170 start = 0; 171 size = memparse(p, &p); 172 if (*p == '@') 173 start = memparse(p + 1, &p); 174 else { 175 pr_err("Invalid format!\n"); 176 return -EINVAL; 177 } 178 179 if (!IS_ENABLED(CONFIG_NUMA)) 180 memblock_add(start, size); 181 else 182 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE); 183 184 return 0; 185 } 186 early_param("mem", early_parse_mem); 187 188 void __init platform_init(void) 189 { 190 #ifdef CONFIG_ACPI_TABLE_UPGRADE 191 acpi_table_upgrade(); 192 #endif 193 #ifdef CONFIG_ACPI 194 acpi_gbl_use_default_register_widths = false; 195 acpi_boot_table_init(); 196 acpi_boot_init(); 197 #endif 198 199 #ifdef CONFIG_NUMA 200 init_numa_memory(); 201 #endif 202 dmi_setup(); 203 smbios_parse(); 204 pr_info("The BIOS Version: %s\n", b_info.bios_version); 205 206 efi_runtime_init(); 207 } 208 209 static void __init check_kernel_sections_mem(void) 210 { 211 phys_addr_t start = __pa_symbol(&_text); 212 phys_addr_t size = __pa_symbol(&_end) - start; 213 214 if (!memblock_is_region_memory(start, size)) { 215 pr_info("Kernel sections are not in the memory maps\n"); 216 memblock_add(start, size); 217 } 218 } 219 220 /* 221 * arch_mem_init - initialize memory management subsystem 222 */ 223 static void __init arch_mem_init(char **cmdline_p) 224 { 225 if (usermem) 226 pr_info("User-defined physical RAM map overwrite\n"); 227 228 check_kernel_sections_mem(); 229 230 /* 231 * In order to reduce the possibility of kernel panic when failed to 232 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 233 * low memory as small as possible before plat_swiotlb_setup(), so 234 * make sparse_init() using top-down allocation. 235 */ 236 memblock_set_bottom_up(false); 237 sparse_init(); 238 memblock_set_bottom_up(true); 239 240 plat_swiotlb_setup(); 241 242 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 243 244 memblock_dump_all(); 245 246 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 247 } 248 249 static void __init resource_init(void) 250 { 251 long i = 0; 252 size_t res_size; 253 struct resource *res; 254 struct memblock_region *region; 255 256 code_resource.start = __pa_symbol(&_text); 257 code_resource.end = __pa_symbol(&_etext) - 1; 258 data_resource.start = __pa_symbol(&_etext); 259 data_resource.end = __pa_symbol(&_edata) - 1; 260 bss_resource.start = __pa_symbol(&__bss_start); 261 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 262 263 num_standard_resources = memblock.memory.cnt; 264 res_size = num_standard_resources * sizeof(*standard_resources); 265 standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES); 266 267 for_each_mem_region(region) { 268 res = &standard_resources[i++]; 269 if (!memblock_is_nomap(region)) { 270 res->name = "System RAM"; 271 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 272 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 273 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 274 } else { 275 res->name = "Reserved"; 276 res->flags = IORESOURCE_MEM; 277 res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); 278 res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1; 279 } 280 281 request_resource(&iomem_resource, res); 282 283 /* 284 * We don't know which RAM region contains kernel data, 285 * so we try it repeatedly and let the resource manager 286 * test it. 287 */ 288 request_resource(res, &code_resource); 289 request_resource(res, &data_resource); 290 request_resource(res, &bss_resource); 291 } 292 } 293 294 static int __init reserve_memblock_reserved_regions(void) 295 { 296 u64 i, j; 297 298 for (i = 0; i < num_standard_resources; ++i) { 299 struct resource *mem = &standard_resources[i]; 300 phys_addr_t r_start, r_end, mem_size = resource_size(mem); 301 302 if (!memblock_is_region_reserved(mem->start, mem_size)) 303 continue; 304 305 for_each_reserved_mem_range(j, &r_start, &r_end) { 306 resource_size_t start, end; 307 308 start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start); 309 end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end); 310 311 if (start > mem->end || end < mem->start) 312 continue; 313 314 reserve_region_with_split(mem, start, end, "Reserved"); 315 } 316 } 317 318 return 0; 319 } 320 arch_initcall(reserve_memblock_reserved_regions); 321 322 #ifdef CONFIG_SMP 323 static void __init prefill_possible_map(void) 324 { 325 int i, possible; 326 327 possible = num_processors + disabled_cpus; 328 if (possible > nr_cpu_ids) 329 possible = nr_cpu_ids; 330 331 pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n", 332 possible, max((possible - num_processors), 0)); 333 334 for (i = 0; i < possible; i++) 335 set_cpu_possible(i, true); 336 for (; i < NR_CPUS; i++) 337 set_cpu_possible(i, false); 338 339 nr_cpu_ids = possible; 340 } 341 #endif 342 343 void __init setup_arch(char **cmdline_p) 344 { 345 cpu_probe(); 346 *cmdline_p = boot_command_line; 347 348 init_environ(); 349 efi_init(); 350 memblock_init(); 351 parse_early_param(); 352 353 platform_init(); 354 pagetable_init(); 355 arch_mem_init(cmdline_p); 356 357 resource_init(); 358 #ifdef CONFIG_SMP 359 plat_smp_setup(); 360 prefill_possible_map(); 361 #endif 362 363 paging_init(); 364 } 365