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 LOONGSON_EFI_ENABLE (1 << 3)
60
61 unsigned long fw_arg0, fw_arg1, fw_arg2;
62 DEFINE_PER_CPU(unsigned long, kernelsp);
63 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;
64
65 EXPORT_SYMBOL(cpu_data);
66
67 struct loongson_board_info b_info;
68 static const char dmi_empty_string[] = " ";
69
70 /*
71 * Setup information
72 *
73 * These are initialized so they are in the .data section
74 */
75 char init_command_line[COMMAND_LINE_SIZE] __initdata;
76
77 static int num_standard_resources;
78 static struct resource *standard_resources;
79
80 static struct resource code_resource = { .name = "Kernel code", };
81 static struct resource data_resource = { .name = "Kernel data", };
82 static struct resource bss_resource = { .name = "Kernel bss", };
83
get_system_type(void)84 const char *get_system_type(void)
85 {
86 return "generic-loongson-machine";
87 }
88
arch_cpu_finalize_init(void)89 void __init arch_cpu_finalize_init(void)
90 {
91 alternative_instructions();
92 }
93
dmi_string_parse(const struct dmi_header * dm,u8 s)94 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s)
95 {
96 const u8 *bp = ((u8 *) dm) + dm->length;
97
98 if (s) {
99 s--;
100 while (s > 0 && *bp) {
101 bp += strlen(bp) + 1;
102 s--;
103 }
104
105 if (*bp != 0) {
106 size_t len = strlen(bp)+1;
107 size_t cmp_len = len > 8 ? 8 : len;
108
109 if (!memcmp(bp, dmi_empty_string, cmp_len))
110 return dmi_empty_string;
111
112 return bp;
113 }
114 }
115
116 return "";
117 }
118
parse_cpu_table(const struct dmi_header * dm)119 static void __init parse_cpu_table(const struct dmi_header *dm)
120 {
121 long freq_temp = 0;
122 char *dmi_data = (char *)dm;
123
124 freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) +
125 ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK));
126 cpu_clock_freq = freq_temp * 1000000;
127
128 loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
129 loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_THREAD_PACKAGE_OFFSET);
130
131 pr_info("CpuClock = %llu\n", cpu_clock_freq);
132 }
133
parse_bios_table(const struct dmi_header * dm)134 static void __init parse_bios_table(const struct dmi_header *dm)
135 {
136 char *dmi_data = (char *)dm;
137
138 b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6;
139 }
140
find_tokens(const struct dmi_header * dm,void * dummy)141 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
142 {
143 switch (dm->type) {
144 case 0x0: /* Extern BIOS */
145 parse_bios_table(dm);
146 break;
147 case 0x4: /* Calling interface */
148 parse_cpu_table(dm);
149 break;
150 }
151 }
smbios_parse(void)152 static void __init smbios_parse(void)
153 {
154 b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR);
155 b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION);
156 b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE);
157 b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR);
158 b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME);
159 dmi_walk(find_tokens, NULL);
160 }
161
162 #ifdef CONFIG_ARCH_WRITECOMBINE
163 bool wc_enabled = true;
164 #else
165 bool wc_enabled = false;
166 #endif
167
168 EXPORT_SYMBOL(wc_enabled);
169
setup_writecombine(char * p)170 static int __init setup_writecombine(char *p)
171 {
172 if (!strcmp(p, "on"))
173 wc_enabled = true;
174 else if (!strcmp(p, "off"))
175 wc_enabled = false;
176 else
177 pr_warn("Unknown writecombine setting \"%s\".\n", p);
178
179 return 0;
180 }
181 early_param("writecombine", setup_writecombine);
182
183 static int usermem __initdata;
184
early_parse_mem(char * p)185 static int __init early_parse_mem(char *p)
186 {
187 phys_addr_t start, size;
188
189 if (!p) {
190 pr_err("mem parameter is empty, do nothing\n");
191 return -EINVAL;
192 }
193
194 /*
195 * If a user specifies memory size, we
196 * blow away any automatically generated
197 * size.
198 */
199 if (usermem == 0) {
200 usermem = 1;
201 memblock_remove(memblock_start_of_DRAM(),
202 memblock_end_of_DRAM() - memblock_start_of_DRAM());
203 }
204 start = 0;
205 size = memparse(p, &p);
206 if (*p == '@')
207 start = memparse(p + 1, &p);
208 else {
209 pr_err("Invalid format!\n");
210 return -EINVAL;
211 }
212
213 if (!IS_ENABLED(CONFIG_NUMA))
214 memblock_add(start, size);
215 else
216 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
217
218 return 0;
219 }
220 early_param("mem", early_parse_mem);
221
arch_reserve_vmcore(void)222 static void __init arch_reserve_vmcore(void)
223 {
224 #ifdef CONFIG_PROC_VMCORE
225 u64 i;
226 phys_addr_t start, end;
227
228 if (!is_kdump_kernel())
229 return;
230
231 if (!elfcorehdr_size) {
232 for_each_mem_range(i, &start, &end) {
233 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
234 /*
235 * Reserve from the elf core header to the end of
236 * the memory segment, that should all be kdump
237 * reserved memory.
238 */
239 elfcorehdr_size = end - elfcorehdr_addr;
240 break;
241 }
242 }
243 }
244
245 if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
246 pr_warn("elfcorehdr is overlapped\n");
247 return;
248 }
249
250 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
251
252 pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n",
253 elfcorehdr_size >> 10, elfcorehdr_addr);
254 #endif
255 }
256
arch_reserve_crashkernel(void)257 static void __init arch_reserve_crashkernel(void)
258 {
259 int ret;
260 unsigned long long low_size = 0;
261 unsigned long long crash_base, crash_size;
262 char *cmdline = boot_command_line;
263 bool high = false;
264
265 if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
266 return;
267
268 ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),
269 &crash_size, &crash_base, &low_size, &high);
270 if (ret)
271 return;
272
273 reserve_crashkernel_generic(cmdline, crash_size, crash_base, low_size, high);
274 }
275
fdt_setup(void)276 static void __init fdt_setup(void)
277 {
278 #ifdef CONFIG_OF_EARLY_FLATTREE
279 void *fdt_pointer;
280
281 /* ACPI-based systems do not require parsing fdt */
282 if (acpi_os_get_root_pointer())
283 return;
284
285 /* Prefer to use built-in dtb, checking its legality first. */
286 if (IS_ENABLED(CONFIG_BUILTIN_DTB) && !fdt_check_header(__dtb_start))
287 fdt_pointer = __dtb_start;
288 else
289 fdt_pointer = efi_fdt_pointer(); /* Fallback to firmware dtb */
290
291 if (!fdt_pointer || fdt_check_header(fdt_pointer))
292 return;
293
294 early_init_dt_scan(fdt_pointer);
295 early_init_fdt_reserve_self();
296
297 max_low_pfn = PFN_PHYS(memblock_end_of_DRAM());
298 #endif
299 }
300
bootcmdline_init(char ** cmdline_p)301 static void __init bootcmdline_init(char **cmdline_p)
302 {
303 /*
304 * If CONFIG_CMDLINE_FORCE is enabled then initializing the command line
305 * is trivial - we simply use the built-in command line unconditionally &
306 * unmodified.
307 */
308 if (IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
309 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
310 goto out;
311 }
312
313 #ifdef CONFIG_OF_FLATTREE
314 /*
315 * If CONFIG_CMDLINE_BOOTLOADER is enabled and we are in FDT-based system,
316 * the boot_command_line will be overwritten by early_init_dt_scan_chosen().
317 * So we need to append init_command_line (the original copy of boot_command_line)
318 * to boot_command_line.
319 */
320 if (initial_boot_params) {
321 if (boot_command_line[0])
322 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
323
324 if (!strstr(boot_command_line, init_command_line))
325 strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);
326
327 goto out;
328 }
329 #endif
330
331 /*
332 * Append built-in command line to the bootloader command line if
333 * CONFIG_CMDLINE_EXTEND is enabled.
334 */
335 if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
336 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
337 strlcat(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
338 }
339
340 /*
341 * Use built-in command line if the bootloader command line is empty.
342 */
343 if (IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && !boot_command_line[0])
344 strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
345
346 out:
347 *cmdline_p = boot_command_line;
348 }
349
platform_init(void)350 void __init platform_init(void)
351 {
352 arch_reserve_vmcore();
353 arch_reserve_crashkernel();
354
355 #ifdef CONFIG_ACPI
356 acpi_table_upgrade();
357 acpi_gbl_use_default_register_widths = false;
358 acpi_boot_table_init();
359 #endif
360
361 early_init_fdt_scan_reserved_mem();
362 unflatten_and_copy_device_tree();
363
364 #ifdef CONFIG_NUMA
365 init_numa_memory();
366 #endif
367 dmi_setup();
368 smbios_parse();
369 pr_info("The BIOS Version: %s\n", b_info.bios_version);
370
371 efi_runtime_init();
372 }
373
check_kernel_sections_mem(void)374 static void __init check_kernel_sections_mem(void)
375 {
376 phys_addr_t start = __pa_symbol(&_text);
377 phys_addr_t size = __pa_symbol(&_end) - start;
378
379 if (!memblock_is_region_memory(start, size)) {
380 pr_info("Kernel sections are not in the memory maps\n");
381 memblock_add(start, size);
382 }
383 }
384
385 /*
386 * arch_mem_init - initialize memory management subsystem
387 */
arch_mem_init(char ** cmdline_p)388 static void __init arch_mem_init(char **cmdline_p)
389 {
390 if (usermem)
391 pr_info("User-defined physical RAM map overwrite\n");
392
393 check_kernel_sections_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
resource_init(void)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
add_legacy_isa_io(struct fwnode_handle * fwnode,resource_size_t hw_start,resource_size_t size)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 vmap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL));
494
495 return 0;
496 }
497
arch_reserve_pio_range(void)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
reserve_memblock_reserved_regions(void)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
prefill_possible_map(void)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_present(i, false);
582 set_cpu_possible(i, false);
583 }
584
585 set_nr_cpu_ids(possible);
586 }
587 #endif
588
setup_arch(char ** cmdline_p)589 void __init setup_arch(char **cmdline_p)
590 {
591 cpu_probe();
592 unwind_init();
593
594 init_environ();
595 efi_init();
596 fdt_setup();
597 memblock_init();
598 pagetable_init();
599 bootcmdline_init(cmdline_p);
600 parse_early_param();
601 reserve_initrd_mem();
602
603 platform_init();
604 arch_mem_init(cmdline_p);
605
606 resource_init();
607 jump_label_init(); /* Initialise the static keys for paravirtualization */
608
609 #ifdef CONFIG_SMP
610 plat_smp_setup();
611 prefill_possible_map();
612 #endif
613
614 paging_init();
615
616 #ifdef CONFIG_KASAN
617 kasan_init();
618 #endif
619 }
620