xref: /linux/arch/loongarch/kernel/setup.c (revision 409c38d4f156740bf3165fd6ceae4fa6425eebf4) 
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 
51 #define SMBIOS_BIOSSIZE_OFFSET		0x09
52 #define SMBIOS_BIOSEXTERN_OFFSET	0x13
53 #define SMBIOS_FREQLOW_OFFSET		0x16
54 #define SMBIOS_FREQHIGH_OFFSET		0x17
55 #define SMBIOS_FREQLOW_MASK		0xFF
56 #define SMBIOS_CORE_PACKAGE_OFFSET	0x23
57 #define LOONGSON_EFI_ENABLE		(1 << 3)
58 
59 unsigned long fw_arg0, fw_arg1, fw_arg2;
60 DEFINE_PER_CPU(unsigned long, kernelsp);
61 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;
62 
63 EXPORT_SYMBOL(cpu_data);
64 
65 struct loongson_board_info b_info;
66 static const char dmi_empty_string[] = "        ";
67 
68 /*
69  * Setup information
70  *
71  * These are initialized so they are in the .data section
72  */
73 char init_command_line[COMMAND_LINE_SIZE] __initdata;
74 
75 static int num_standard_resources;
76 static struct resource *standard_resources;
77 
78 static struct resource code_resource = { .name = "Kernel code", };
79 static struct resource data_resource = { .name = "Kernel data", };
80 static struct resource bss_resource  = { .name = "Kernel bss", };
81 
82 const char *get_system_type(void)
83 {
84 	return "generic-loongson-machine";
85 }
86 
87 void __init arch_cpu_finalize_init(void)
88 {
89 	alternative_instructions();
90 }
91 
92 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s)
93 {
94 	const u8 *bp = ((u8 *) dm) + dm->length;
95 
96 	if (s) {
97 		s--;
98 		while (s > 0 && *bp) {
99 			bp += strlen(bp) + 1;
100 			s--;
101 		}
102 
103 		if (*bp != 0) {
104 			size_t len = strlen(bp)+1;
105 			size_t cmp_len = len > 8 ? 8 : len;
106 
107 			if (!memcmp(bp, dmi_empty_string, cmp_len))
108 				return dmi_empty_string;
109 
110 			return bp;
111 		}
112 	}
113 
114 	return "";
115 }
116 
117 static void __init parse_cpu_table(const struct dmi_header *dm)
118 {
119 	long freq_temp = 0;
120 	char *dmi_data = (char *)dm;
121 
122 	freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) +
123 			((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK));
124 	cpu_clock_freq = freq_temp * 1000000;
125 
126 	loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
127 	loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET);
128 
129 	pr_info("CpuClock = %llu\n", cpu_clock_freq);
130 }
131 
132 static void __init parse_bios_table(const struct dmi_header *dm)
133 {
134 	char *dmi_data = (char *)dm;
135 
136 	b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6;
137 }
138 
139 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
140 {
141 	switch (dm->type) {
142 	case 0x0: /* Extern BIOS */
143 		parse_bios_table(dm);
144 		break;
145 	case 0x4: /* Calling interface */
146 		parse_cpu_table(dm);
147 		break;
148 	}
149 }
150 static void __init smbios_parse(void)
151 {
152 	b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR);
153 	b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION);
154 	b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE);
155 	b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR);
156 	b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME);
157 	dmi_walk(find_tokens, NULL);
158 }
159 
160 #ifdef CONFIG_ARCH_WRITECOMBINE
161 bool wc_enabled = true;
162 #else
163 bool wc_enabled = false;
164 #endif
165 
166 EXPORT_SYMBOL(wc_enabled);
167 
168 static int __init setup_writecombine(char *p)
169 {
170 	if (!strcmp(p, "on"))
171 		wc_enabled = true;
172 	else if (!strcmp(p, "off"))
173 		wc_enabled = false;
174 	else
175 		pr_warn("Unknown writecombine setting \"%s\".\n", p);
176 
177 	return 0;
178 }
179 early_param("writecombine", setup_writecombine);
180 
181 static int usermem __initdata;
182 
183 static int __init early_parse_mem(char *p)
184 {
185 	phys_addr_t start, size;
186 
187 	if (!p) {
188 		pr_err("mem parameter is empty, do nothing\n");
189 		return -EINVAL;
190 	}
191 
192 	/*
193 	 * If a user specifies memory size, we
194 	 * blow away any automatically generated
195 	 * size.
196 	 */
197 	if (usermem == 0) {
198 		usermem = 1;
199 		memblock_remove(memblock_start_of_DRAM(),
200 			memblock_end_of_DRAM() - memblock_start_of_DRAM());
201 	}
202 	start = 0;
203 	size = memparse(p, &p);
204 	if (*p == '@')
205 		start = memparse(p + 1, &p);
206 	else {
207 		pr_err("Invalid format!\n");
208 		return -EINVAL;
209 	}
210 
211 	if (!IS_ENABLED(CONFIG_NUMA))
212 		memblock_add(start, size);
213 	else
214 		memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
215 
216 	return 0;
217 }
218 early_param("mem", early_parse_mem);
219 
220 static void __init arch_reserve_vmcore(void)
221 {
222 #ifdef CONFIG_PROC_VMCORE
223 	u64 i;
224 	phys_addr_t start, end;
225 
226 	if (!is_kdump_kernel())
227 		return;
228 
229 	if (!elfcorehdr_size) {
230 		for_each_mem_range(i, &start, &end) {
231 			if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
232 				/*
233 				 * Reserve from the elf core header to the end of
234 				 * the memory segment, that should all be kdump
235 				 * reserved memory.
236 				 */
237 				elfcorehdr_size = end - elfcorehdr_addr;
238 				break;
239 			}
240 		}
241 	}
242 
243 	if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
244 		pr_warn("elfcorehdr is overlapped\n");
245 		return;
246 	}
247 
248 	memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
249 
250 	pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n",
251 		elfcorehdr_size >> 10, elfcorehdr_addr);
252 #endif
253 }
254 
255 static void __init arch_reserve_crashkernel(void)
256 {
257 	int ret;
258 	unsigned long long low_size = 0;
259 	unsigned long long crash_base, crash_size;
260 	char *cmdline = boot_command_line;
261 	bool high = false;
262 
263 	if (!IS_ENABLED(CONFIG_KEXEC_CORE))
264 		return;
265 
266 	ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),
267 				&crash_size, &crash_base, &low_size, &high);
268 	if (ret)
269 		return;
270 
271 	reserve_crashkernel_generic(cmdline, crash_size, crash_base, low_size, high);
272 }
273 
274 static void __init fdt_setup(void)
275 {
276 #ifdef CONFIG_OF_EARLY_FLATTREE
277 	void *fdt_pointer;
278 
279 	/* ACPI-based systems do not require parsing fdt */
280 	if (acpi_os_get_root_pointer())
281 		return;
282 
283 	/* Prefer to use built-in dtb, checking its legality first. */
284 	if (!fdt_check_header(__dtb_start))
285 		fdt_pointer = __dtb_start;
286 	else
287 		fdt_pointer = efi_fdt_pointer(); /* Fallback to firmware dtb */
288 
289 	if (!fdt_pointer || fdt_check_header(fdt_pointer))
290 		return;
291 
292 	early_init_dt_scan(fdt_pointer);
293 	early_init_fdt_reserve_self();
294 
295 	max_low_pfn = PFN_PHYS(memblock_end_of_DRAM());
296 #endif
297 }
298 
299 static void __init bootcmdline_init(char **cmdline_p)
300 {
301 	/*
302 	 * If CONFIG_CMDLINE_FORCE is enabled then initializing the command line
303 	 * is trivial - we simply use the built-in command line unconditionally &
304 	 * unmodified.
305 	 */
306 	if (IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
307 		strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
308 		goto out;
309 	}
310 
311 #ifdef CONFIG_OF_FLATTREE
312 	/*
313 	 * If CONFIG_CMDLINE_BOOTLOADER is enabled and we are in FDT-based system,
314 	 * the boot_command_line will be overwritten by early_init_dt_scan_chosen().
315 	 * So we need to append init_command_line (the original copy of boot_command_line)
316 	 * to boot_command_line.
317 	 */
318 	if (initial_boot_params) {
319 		if (boot_command_line[0])
320 			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
321 
322 		if (!strstr(boot_command_line, init_command_line))
323 			strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);
324 
325 		goto out;
326 	}
327 #endif
328 
329 	/*
330 	 * Append built-in command line to the bootloader command line if
331 	 * CONFIG_CMDLINE_EXTEND is enabled.
332 	 */
333 	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
334 		strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
335 		strlcat(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
336 	}
337 
338 	/*
339 	 * Use built-in command line if the bootloader command line is empty.
340 	 */
341 	if (IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && !boot_command_line[0])
342 		strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
343 
344 out:
345 	*cmdline_p = boot_command_line;
346 }
347 
348 void __init platform_init(void)
349 {
350 	arch_reserve_vmcore();
351 	arch_reserve_crashkernel();
352 
353 #ifdef CONFIG_ACPI_TABLE_UPGRADE
354 	acpi_table_upgrade();
355 #endif
356 #ifdef CONFIG_ACPI
357 	acpi_gbl_use_default_register_widths = false;
358 	acpi_boot_table_init();
359 #endif
360 	unflatten_and_copy_device_tree();
361 
362 #ifdef CONFIG_NUMA
363 	init_numa_memory();
364 #endif
365 	dmi_setup();
366 	smbios_parse();
367 	pr_info("The BIOS Version: %s\n", b_info.bios_version);
368 
369 	efi_runtime_init();
370 }
371 
372 static void __init check_kernel_sections_mem(void)
373 {
374 	phys_addr_t start = __pa_symbol(&_text);
375 	phys_addr_t size = __pa_symbol(&_end) - start;
376 
377 	if (!memblock_is_region_memory(start, size)) {
378 		pr_info("Kernel sections are not in the memory maps\n");
379 		memblock_add(start, size);
380 	}
381 }
382 
383 /*
384  * arch_mem_init - initialize memory management subsystem
385  */
386 static void __init arch_mem_init(char **cmdline_p)
387 {
388 	if (usermem)
389 		pr_info("User-defined physical RAM map overwrite\n");
390 
391 	check_kernel_sections_mem();
392 
393 	early_init_fdt_scan_reserved_mem();
394 
395 	/*
396 	 * In order to reduce the possibility of kernel panic when failed to
397 	 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
398 	 * low memory as small as possible before swiotlb_init(), so make
399 	 * sparse_init() using top-down allocation.
400 	 */
401 	memblock_set_bottom_up(false);
402 	sparse_init();
403 	memblock_set_bottom_up(true);
404 
405 	swiotlb_init(true, SWIOTLB_VERBOSE);
406 
407 	dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
408 
409 	/* Reserve for hibernation. */
410 	register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)),
411 				   PFN_UP(__pa_symbol(&__nosave_end)));
412 
413 	memblock_dump_all();
414 
415 	early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
416 }
417 
418 static void __init resource_init(void)
419 {
420 	long i = 0;
421 	size_t res_size;
422 	struct resource *res;
423 	struct memblock_region *region;
424 
425 	code_resource.start = __pa_symbol(&_text);
426 	code_resource.end = __pa_symbol(&_etext) - 1;
427 	data_resource.start = __pa_symbol(&_etext);
428 	data_resource.end = __pa_symbol(&_edata) - 1;
429 	bss_resource.start = __pa_symbol(&__bss_start);
430 	bss_resource.end = __pa_symbol(&__bss_stop) - 1;
431 
432 	num_standard_resources = memblock.memory.cnt;
433 	res_size = num_standard_resources * sizeof(*standard_resources);
434 	standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
435 
436 	for_each_mem_region(region) {
437 		res = &standard_resources[i++];
438 		if (!memblock_is_nomap(region)) {
439 			res->name  = "System RAM";
440 			res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
441 			res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
442 			res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
443 		} else {
444 			res->name  = "Reserved";
445 			res->flags = IORESOURCE_MEM;
446 			res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
447 			res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
448 		}
449 
450 		request_resource(&iomem_resource, res);
451 
452 		/*
453 		 *  We don't know which RAM region contains kernel data,
454 		 *  so we try it repeatedly and let the resource manager
455 		 *  test it.
456 		 */
457 		request_resource(res, &code_resource);
458 		request_resource(res, &data_resource);
459 		request_resource(res, &bss_resource);
460 	}
461 }
462 
463 static int __init add_legacy_isa_io(struct fwnode_handle *fwnode,
464 				resource_size_t hw_start, resource_size_t size)
465 {
466 	int ret = 0;
467 	unsigned long vaddr;
468 	struct logic_pio_hwaddr *range;
469 
470 	range = kzalloc(sizeof(*range), GFP_ATOMIC);
471 	if (!range)
472 		return -ENOMEM;
473 
474 	range->fwnode = fwnode;
475 	range->size = size = round_up(size, PAGE_SIZE);
476 	range->hw_start = hw_start;
477 	range->flags = LOGIC_PIO_CPU_MMIO;
478 
479 	ret = logic_pio_register_range(range);
480 	if (ret) {
481 		kfree(range);
482 		return ret;
483 	}
484 
485 	/* Legacy ISA must placed at the start of PCI_IOBASE */
486 	if (range->io_start != 0) {
487 		logic_pio_unregister_range(range);
488 		kfree(range);
489 		return -EINVAL;
490 	}
491 
492 	vaddr = (unsigned long)(PCI_IOBASE + range->io_start);
493 	ioremap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL));
494 
495 	return 0;
496 }
497 
498 static __init int arch_reserve_pio_range(void)
499 {
500 	struct device_node *np;
501 
502 	for_each_node_by_name(np, "isa") {
503 		struct of_range range;
504 		struct of_range_parser parser;
505 
506 		pr_info("ISA Bridge: %pOF\n", np);
507 
508 		if (of_range_parser_init(&parser, np)) {
509 			pr_info("Failed to parse resources.\n");
510 			of_node_put(np);
511 			break;
512 		}
513 
514 		for_each_of_range(&parser, &range) {
515 			switch (range.flags & IORESOURCE_TYPE_BITS) {
516 			case IORESOURCE_IO:
517 				pr_info(" IO 0x%016llx..0x%016llx  ->  0x%016llx\n",
518 					range.cpu_addr,
519 					range.cpu_addr + range.size - 1,
520 					range.bus_addr);
521 				if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size))
522 					pr_warn("Failed to reserve legacy IO in Logic PIO\n");
523 				break;
524 			case IORESOURCE_MEM:
525 				pr_info(" MEM 0x%016llx..0x%016llx  ->  0x%016llx\n",
526 					range.cpu_addr,
527 					range.cpu_addr + range.size - 1,
528 					range.bus_addr);
529 				break;
530 			}
531 		}
532 	}
533 
534 	return 0;
535 }
536 arch_initcall(arch_reserve_pio_range);
537 
538 static int __init reserve_memblock_reserved_regions(void)
539 {
540 	u64 i, j;
541 
542 	for (i = 0; i < num_standard_resources; ++i) {
543 		struct resource *mem = &standard_resources[i];
544 		phys_addr_t r_start, r_end, mem_size = resource_size(mem);
545 
546 		if (!memblock_is_region_reserved(mem->start, mem_size))
547 			continue;
548 
549 		for_each_reserved_mem_range(j, &r_start, &r_end) {
550 			resource_size_t start, end;
551 
552 			start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
553 			end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
554 
555 			if (start > mem->end || end < mem->start)
556 				continue;
557 
558 			reserve_region_with_split(mem, start, end, "Reserved");
559 		}
560 	}
561 
562 	return 0;
563 }
564 arch_initcall(reserve_memblock_reserved_regions);
565 
566 #ifdef CONFIG_SMP
567 static void __init prefill_possible_map(void)
568 {
569 	int i, possible;
570 
571 	possible = num_processors + disabled_cpus;
572 	if (possible > nr_cpu_ids)
573 		possible = nr_cpu_ids;
574 
575 	pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n",
576 			possible, max((possible - num_processors), 0));
577 
578 	for (i = 0; i < possible; i++)
579 		set_cpu_possible(i, true);
580 	for (; i < NR_CPUS; i++)
581 		set_cpu_possible(i, false);
582 
583 	set_nr_cpu_ids(possible);
584 }
585 #endif
586 
587 void __init setup_arch(char **cmdline_p)
588 {
589 	cpu_probe();
590 
591 	init_environ();
592 	efi_init();
593 	fdt_setup();
594 	memblock_init();
595 	pagetable_init();
596 	bootcmdline_init(cmdline_p);
597 	parse_early_param();
598 	reserve_initrd_mem();
599 
600 	platform_init();
601 	arch_mem_init(cmdline_p);
602 
603 	resource_init();
604 #ifdef CONFIG_SMP
605 	plat_smp_setup();
606 	prefill_possible_map();
607 #endif
608 
609 	paging_init();
610 
611 #ifdef CONFIG_KASAN
612 	kasan_init();
613 #endif
614 }
615