xref: /linux/arch/loongarch/kernel/setup.c (revision 23b0f90ba871f096474e1c27c3d14f455189d2d9) 
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/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/cache.h>
41 #include <asm/cpu.h>
42 #include <asm/dma.h>
43 #include <asm/efi.h>
44 #include <asm/loongson.h>
45 #include <asm/numa.h>
46 #include <asm/pgalloc.h>
47 #include <asm/sections.h>
48 #include <asm/setup.h>
49 #include <asm/time.h>
50 #include <asm/unwind.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 SMBIOS_THREAD_PACKAGE_OFFSET	0x25
59 #define SMBIOS_THREAD_PACKAGE_2_OFFSET	0x2E
60 #define LOONGSON_EFI_ENABLE		(1 << 3)
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 arch_cpu_finalize_init(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 = *(u8 *)(dmi_data + SMBIOS_THREAD_PACKAGE_OFFSET);
131 	if (dm->length >= 0x30 && loongson_sysconf.cores_per_package == 0xff) {
132 		/* SMBIOS 3.0+ has ThreadCount2 for more than 255 threads */
133 		loongson_sysconf.cores_per_package =
134 					  *(u16 *)(dmi_data + SMBIOS_THREAD_PACKAGE_2_OFFSET);
135 	}
136 
137 	pr_info("CpuClock = %llu\n", cpu_clock_freq);
138 }
139 
140 static void __init parse_bios_table(const struct dmi_header *dm)
141 {
142 	char *dmi_data = (char *)dm;
143 
144 	b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6;
145 }
146 
147 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
148 {
149 	switch (dm->type) {
150 	case 0x0: /* Extern BIOS */
151 		parse_bios_table(dm);
152 		break;
153 	case 0x4: /* Calling interface */
154 		parse_cpu_table(dm);
155 		break;
156 	}
157 }
158 static void __init smbios_parse(void)
159 {
160 	b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR);
161 	b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION);
162 	b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE);
163 	b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR);
164 	b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME);
165 	dmi_walk(find_tokens, NULL);
166 }
167 
168 #ifdef CONFIG_ARCH_WRITECOMBINE
169 bool wc_enabled = true;
170 #else
171 bool wc_enabled = false;
172 #endif
173 
174 EXPORT_SYMBOL(wc_enabled);
175 
176 static int __init setup_writecombine(char *p)
177 {
178 	if (!strcmp(p, "on"))
179 		wc_enabled = true;
180 	else if (!strcmp(p, "off"))
181 		wc_enabled = false;
182 	else
183 		pr_warn("Unknown writecombine setting \"%s\".\n", p);
184 
185 	return 0;
186 }
187 early_param("writecombine", setup_writecombine);
188 
189 static int usermem __initdata;
190 
191 static int __init early_parse_mem(char *p)
192 {
193 	phys_addr_t start, size;
194 
195 	if (!p) {
196 		pr_err("mem parameter is empty, do nothing\n");
197 		return -EINVAL;
198 	}
199 
200 	start = 0;
201 	size = memparse(p, &p);
202 	if (*p == '@')	/* Every mem=... should contain '@' */
203 		start = memparse(p + 1, &p);
204 	else {		/* Only one mem=... is allowed if no '@' */
205 		usermem = 1;
206 		memblock_enforce_memory_limit(size);
207 		return 0;
208 	}
209 
210 	/*
211 	 * If a user specifies memory size, we
212 	 * blow away any automatically generated
213 	 * size.
214 	 */
215 	if (usermem == 0) {
216 		usermem = 1;
217 		memblock_remove(memblock_start_of_DRAM(),
218 			memblock_end_of_DRAM() - memblock_start_of_DRAM());
219 	}
220 
221 	if (!IS_ENABLED(CONFIG_NUMA))
222 		memblock_add(start, size);
223 	else
224 		memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
225 
226 	return 0;
227 }
228 early_param("mem", early_parse_mem);
229 
230 static void __init arch_reserve_vmcore(void)
231 {
232 #ifdef CONFIG_PROC_VMCORE
233 	u64 i;
234 	phys_addr_t start, end;
235 
236 	if (!is_kdump_kernel())
237 		return;
238 
239 	if (!elfcorehdr_size) {
240 		for_each_mem_range(i, &start, &end) {
241 			if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
242 				/*
243 				 * Reserve from the elf core header to the end of
244 				 * the memory segment, that should all be kdump
245 				 * reserved memory.
246 				 */
247 				elfcorehdr_size = end - elfcorehdr_addr;
248 				break;
249 			}
250 		}
251 	}
252 
253 	if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
254 		pr_warn("elfcorehdr is overlapped\n");
255 		return;
256 	}
257 
258 	memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
259 
260 	pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n",
261 		elfcorehdr_size >> 10, elfcorehdr_addr);
262 #endif
263 }
264 
265 static void __init arch_reserve_crashkernel(void)
266 {
267 	int ret;
268 	unsigned long long low_size = 0;
269 	unsigned long long crash_base, crash_size;
270 	bool high = false;
271 
272 	if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
273 		return;
274 
275 	ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
276 				&crash_size, &crash_base, &low_size, NULL, &high);
277 	if (ret)
278 		return;
279 
280 	reserve_crashkernel_generic(crash_size, crash_base, low_size, high);
281 }
282 
283 static void __init fdt_setup(void)
284 {
285 #ifdef CONFIG_OF_EARLY_FLATTREE
286 	void *fdt_pointer;
287 
288 	/* ACPI-based systems do not require parsing fdt */
289 	if (acpi_os_get_root_pointer())
290 		return;
291 
292 	/* Prefer to use built-in dtb, checking its legality first. */
293 	if (IS_ENABLED(CONFIG_BUILTIN_DTB) && !fdt_check_header(__dtb_start))
294 		fdt_pointer = __dtb_start;
295 	else
296 		fdt_pointer = efi_fdt_pointer(); /* Fallback to firmware dtb */
297 
298 	if (!fdt_pointer || fdt_check_header(fdt_pointer))
299 		return;
300 
301 	early_init_dt_scan(fdt_pointer, __pa(fdt_pointer));
302 	early_init_fdt_reserve_self();
303 #endif
304 }
305 
306 static void __init bootcmdline_init(char **cmdline_p)
307 {
308 	/*
309 	 * If CONFIG_CMDLINE_FORCE is enabled then initializing the command line
310 	 * is trivial - we simply use the built-in command line unconditionally &
311 	 * unmodified.
312 	 */
313 	if (IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
314 		strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
315 		goto out;
316 	}
317 
318 #ifdef CONFIG_OF_FLATTREE
319 	/*
320 	 * If CONFIG_CMDLINE_BOOTLOADER is enabled and we are in FDT-based system,
321 	 * the boot_command_line will be overwritten by early_init_dt_scan_chosen().
322 	 * So we need to append init_command_line (the original copy of boot_command_line)
323 	 * to boot_command_line.
324 	 */
325 	if (initial_boot_params) {
326 		if (boot_command_line[0])
327 			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
328 
329 		if (!strstr(boot_command_line, init_command_line))
330 			strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);
331 
332 		goto out;
333 	}
334 #endif
335 
336 	/*
337 	 * Append built-in command line to the bootloader command line if
338 	 * CONFIG_CMDLINE_EXTEND is enabled.
339 	 */
340 	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
341 		strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
342 		strlcat(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
343 	}
344 
345 	/*
346 	 * Use built-in command line if the bootloader command line is empty.
347 	 */
348 	if (IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && !boot_command_line[0])
349 		strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
350 
351 out:
352 	*cmdline_p = boot_command_line;
353 }
354 
355 void __init platform_init(void)
356 {
357 	arch_reserve_vmcore();
358 	arch_reserve_crashkernel();
359 
360 #ifdef CONFIG_ACPI
361 	acpi_table_upgrade();
362 	acpi_gbl_use_global_lock = false;
363 	acpi_gbl_use_default_register_widths = false;
364 	acpi_boot_table_init();
365 #endif
366 
367 	early_init_fdt_scan_reserved_mem();
368 	unflatten_and_copy_device_tree();
369 
370 #ifdef CONFIG_NUMA
371 	init_numa_memory();
372 #endif
373 	dmi_setup();
374 	smbios_parse();
375 	pr_info("The BIOS Version: %s\n", b_info.bios_version);
376 
377 	efi_runtime_init();
378 }
379 
380 static void __init check_kernel_sections_mem(void)
381 {
382 	phys_addr_t start = __pa_symbol(&_text);
383 	phys_addr_t size = __pa_symbol(&_end) - start;
384 
385 	if (!memblock_is_region_memory(start, size)) {
386 		pr_info("Kernel sections are not in the memory maps\n");
387 		memblock_add(start, size);
388 	}
389 }
390 
391 /*
392  * arch_mem_init - initialize memory management subsystem
393  */
394 static void __init arch_mem_init(char **cmdline_p)
395 {
396 	/* Recalculate max_low_pfn for "mem=xxx" */
397 	max_pfn = PFN_DOWN(memblock_end_of_DRAM());
398 	max_low_pfn = min(PFN_DOWN(HIGHMEM_START), max_pfn);
399 
400 	if (usermem)
401 		pr_info("User-defined physical RAM map overwrite\n");
402 
403 	check_kernel_sections_mem();
404 
405 	memblock_set_bottom_up(true);
406 
407 	swiotlb_init(true, SWIOTLB_VERBOSE);
408 
409 	dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
410 
411 	/* Reserve for hibernation. */
412 	register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)),
413 				   PFN_UP(__pa_symbol(&__nosave_end)));
414 
415 	memblock_dump_all();
416 	memblock_set_bottom_up(false);
417 
418 	early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
419 }
420 
421 static void __init resource_init(void)
422 {
423 	long i = 0;
424 	size_t res_size;
425 	struct resource *res;
426 	struct memblock_region *region;
427 
428 	code_resource.start = __pa_symbol(&_text);
429 	code_resource.end = __pa_symbol(&_etext) - 1;
430 	data_resource.start = __pa_symbol(&_etext);
431 	data_resource.end = __pa_symbol(&_edata) - 1;
432 	bss_resource.start = __pa_symbol(&__bss_start);
433 	bss_resource.end = __pa_symbol(&__bss_stop) - 1;
434 
435 	num_standard_resources = memblock.memory.cnt;
436 	res_size = num_standard_resources * sizeof(*standard_resources);
437 	standard_resources = memblock_alloc_or_panic(res_size, SMP_CACHE_BYTES);
438 
439 	for_each_mem_region(region) {
440 		res = &standard_resources[i++];
441 		if (!memblock_is_nomap(region)) {
442 			res->name  = "System RAM";
443 			res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
444 			res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
445 			res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
446 		} else {
447 			res->name  = "Reserved";
448 			res->flags = IORESOURCE_MEM;
449 			res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
450 			res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
451 		}
452 
453 		request_resource(&iomem_resource, res);
454 
455 		/*
456 		 *  We don't know which RAM region contains kernel data,
457 		 *  so we try it repeatedly and let the resource manager
458 		 *  test it.
459 		 */
460 		request_resource(res, &code_resource);
461 		request_resource(res, &data_resource);
462 		request_resource(res, &bss_resource);
463 	}
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 	vmap_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_present(i, false);
585 		set_cpu_possible(i, false);
586 	}
587 
588 	set_nr_cpu_ids(possible);
589 }
590 #endif
591 
592 void __init setup_arch(char **cmdline_p)
593 {
594 	cpu_probe();
595 	unwind_init();
596 
597 	init_environ();
598 	efi_init();
599 	fdt_setup();
600 	memblock_init();
601 	pagetable_init();
602 	bootcmdline_init(cmdline_p);
603 	parse_early_param();
604 	reserve_initrd_mem();
605 
606 	platform_init();
607 	arch_mem_init(cmdline_p);
608 
609 	resource_init();
610 	jump_label_init(); /* Initialise the static keys for paravirtualization */
611 
612 #ifdef CONFIG_SMP
613 	plat_smp_setup();
614 	prefill_possible_map();
615 #endif
616 
617 #ifdef CONFIG_KASAN
618 	kasan_init();
619 #endif
620 }
621