1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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
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>
37 #include <asm/addrspace.h>
38 #include <asm/alternative.h>
39 #include <asm/bootinfo.h>
41 #include <asm/cache.h>
45 #include <asm/loongson.h>
47 #include <asm/pgalloc.h>
48 #include <asm/sections.h>
49 #include <asm/setup.h>
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)
60 struct screen_info screen_info __section(".data");
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;
66 EXPORT_SYMBOL(cpu_data);
68 struct loongson_board_info b_info;
69 static const char dmi_empty_string[] = " ";
74 * These are initialized so they are in the .data section
76 char init_command_line[COMMAND_LINE_SIZE] __initdata;
78 static int num_standard_resources;
79 static struct resource *standard_resources;
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", };
85 const char *get_system_type(void)
87 return "generic-loongson-machine";
90 void __init check_bugs(void)
92 alternative_instructions();
95 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s)
97 const u8 *bp = ((u8 *) dm) + dm->length;
101 while (s > 0 && *bp) {
102 bp += strlen(bp) + 1;
107 size_t len = strlen(bp)+1;
108 size_t cmp_len = len > 8 ? 8 : len;
110 if (!memcmp(bp, dmi_empty_string, cmp_len))
111 return dmi_empty_string;
120 static void __init parse_cpu_table(const struct dmi_header *dm)
123 char *dmi_data = (char *)dm;
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;
129 loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
130 loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET);
132 pr_info("CpuClock = %llu\n", cpu_clock_freq);
135 static void __init parse_bios_table(const struct dmi_header *dm)
137 char *dmi_data = (char *)dm;
139 b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6;
142 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
145 case 0x0: /* Extern BIOS */
146 parse_bios_table(dm);
148 case 0x4: /* Calling interface */
153 static void __init smbios_parse(void)
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);
163 #ifdef CONFIG_ARCH_WRITECOMBINE
164 pgprot_t pgprot_wc = PAGE_KERNEL_WUC;
166 pgprot_t pgprot_wc = PAGE_KERNEL_SUC;
169 EXPORT_SYMBOL(pgprot_wc);
171 static int __init setup_writecombine(char *p)
173 if (!strcmp(p, "on"))
174 pgprot_wc = PAGE_KERNEL_WUC;
175 else if (!strcmp(p, "off"))
176 pgprot_wc = PAGE_KERNEL_SUC;
178 pr_warn("Unknown writecombine setting \"%s\".\n", p);
182 early_param("writecombine", setup_writecombine);
184 static int usermem __initdata;
186 static int __init early_parse_mem(char *p)
188 phys_addr_t start, size;
191 pr_err("mem parameter is empty, do nothing\n");
196 * If a user specifies memory size, we
197 * blow away any automatically generated
202 memblock_remove(memblock_start_of_DRAM(),
203 memblock_end_of_DRAM() - memblock_start_of_DRAM());
206 size = memparse(p, &p);
208 start = memparse(p + 1, &p);
210 pr_err("Invalid format!\n");
214 if (!IS_ENABLED(CONFIG_NUMA))
215 memblock_add(start, size);
217 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
221 early_param("mem", early_parse_mem);
223 static void __init arch_reserve_vmcore(void)
225 #ifdef CONFIG_PROC_VMCORE
227 phys_addr_t start, end;
229 if (!is_kdump_kernel())
232 if (!elfcorehdr_size) {
233 for_each_mem_range(i, &start, &end) {
234 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
236 * Reserve from the elf core header to the end of
237 * the memory segment, that should all be kdump
240 elfcorehdr_size = end - elfcorehdr_addr;
246 if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
247 pr_warn("elfcorehdr is overlapped\n");
251 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
253 pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n",
254 elfcorehdr_size >> 10, elfcorehdr_addr);
258 /* 2MB alignment for crash kernel regions */
259 #define CRASH_ALIGN SZ_2M
260 #define CRASH_ADDR_MAX SZ_4G
262 static void __init arch_parse_crashkernel(void)
266 unsigned long long total_mem;
267 unsigned long long crash_base, crash_size;
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)
274 if (crash_base <= 0) {
275 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, CRASH_ALIGN, CRASH_ADDR_MAX);
277 pr_warn("crashkernel reservation failed - No suitable area found.\n");
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");
285 crashk_res.start = crash_base;
286 crashk_res.end = crash_base + crash_size - 1;
290 static void __init fdt_setup(void)
292 #ifdef CONFIG_OF_EARLY_FLATTREE
295 /* ACPI-based systems do not require parsing fdt */
296 if (acpi_os_get_root_pointer())
299 /* Look for a device tree configuration table entry */
300 fdt_pointer = efi_fdt_pointer();
301 if (!fdt_pointer || fdt_check_header(fdt_pointer))
304 early_init_dt_scan(fdt_pointer);
305 early_init_fdt_reserve_self();
307 max_low_pfn = PFN_PHYS(memblock_end_of_DRAM());
311 static void __init bootcmdline_init(char **cmdline_p)
314 * If CONFIG_CMDLINE_FORCE is enabled then initializing the command line
315 * is trivial - we simply use the built-in command line unconditionally &
318 if (IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
319 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
323 #ifdef CONFIG_OF_FLATTREE
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.
330 if (initial_boot_params) {
331 if (boot_command_line[0])
332 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
334 strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);
339 *cmdline_p = boot_command_line;
342 void __init platform_init(void)
344 arch_reserve_vmcore();
345 arch_parse_crashkernel();
347 #ifdef CONFIG_ACPI_TABLE_UPGRADE
348 acpi_table_upgrade();
351 acpi_gbl_use_default_register_widths = false;
352 acpi_boot_table_init();
354 unflatten_and_copy_device_tree();
361 pr_info("The BIOS Version: %s\n", b_info.bios_version);
366 static void __init check_kernel_sections_mem(void)
368 phys_addr_t start = __pa_symbol(&_text);
369 phys_addr_t size = __pa_symbol(&_end) - start;
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);
378 * arch_mem_init - initialize memory management subsystem
380 static void __init arch_mem_init(char **cmdline_p)
383 pr_info("User-defined physical RAM map overwrite\n");
385 check_kernel_sections_mem();
387 early_init_fdt_scan_reserved_mem();
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.
395 memblock_set_bottom_up(false);
397 memblock_set_bottom_up(true);
399 swiotlb_init(true, SWIOTLB_VERBOSE);
401 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
403 /* Reserve for hibernation. */
404 register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)),
405 PFN_UP(__pa_symbol(&__nosave_end)));
409 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
412 static void __init resource_init(void)
416 struct resource *res;
417 struct memblock_region *region;
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;
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);
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;
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;
444 request_resource(&iomem_resource, res);
447 * We don't know which RAM region contains kernel data,
448 * so we try it repeatedly and let the resource manager
451 request_resource(res, &code_resource);
452 request_resource(res, &data_resource);
453 request_resource(res, &bss_resource);
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));
466 static int __init add_legacy_isa_io(struct fwnode_handle *fwnode,
467 resource_size_t hw_start, resource_size_t size)
471 struct logic_pio_hwaddr *range;
473 range = kzalloc(sizeof(*range), GFP_ATOMIC);
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;
482 ret = logic_pio_register_range(range);
488 /* Legacy ISA must placed at the start of PCI_IOBASE */
489 if (range->io_start != 0) {
490 logic_pio_unregister_range(range);
495 vaddr = (unsigned long)(PCI_IOBASE + range->io_start);
496 ioremap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL));
501 static __init int arch_reserve_pio_range(void)
503 struct device_node *np;
505 for_each_node_by_name(np, "isa") {
506 struct of_range range;
507 struct of_range_parser parser;
509 pr_info("ISA Bridge: %pOF\n", np);
511 if (of_range_parser_init(&parser, np)) {
512 pr_info("Failed to parse resources.\n");
517 for_each_of_range(&parser, &range) {
518 switch (range.flags & IORESOURCE_TYPE_BITS) {
520 pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n",
522 range.cpu_addr + range.size - 1,
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");
528 pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx\n",
530 range.cpu_addr + range.size - 1,
539 arch_initcall(arch_reserve_pio_range);
541 static int __init reserve_memblock_reserved_regions(void)
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);
549 if (!memblock_is_region_reserved(mem->start, mem_size))
552 for_each_reserved_mem_range(j, &r_start, &r_end) {
553 resource_size_t start, end;
555 start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
556 end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
558 if (start > mem->end || end < mem->start)
561 reserve_region_with_split(mem, start, end, "Reserved");
567 arch_initcall(reserve_memblock_reserved_regions);
570 static void __init prefill_possible_map(void)
574 possible = num_processors + disabled_cpus;
575 if (possible > nr_cpu_ids)
576 possible = nr_cpu_ids;
578 pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n",
579 possible, max((possible - num_processors), 0));
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);
586 set_nr_cpu_ids(possible);
590 void __init setup_arch(char **cmdline_p)
599 bootcmdline_init(cmdline_p);
601 reserve_initrd_mem();
604 arch_mem_init(cmdline_p);
609 prefill_possible_map();