Merge tag 'fs_for_v5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack...
[linux-2.6-microblaze.git] / arch / loongarch / kernel / setup.c
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 #ifdef CONFIG_VT
53 struct screen_info screen_info;
54 #endif
55
56 unsigned long fw_arg0, fw_arg1;
57 DEFINE_PER_CPU(unsigned long, kernelsp);
58 struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;
59
60 EXPORT_SYMBOL(cpu_data);
61
62 struct loongson_board_info b_info;
63 static const char dmi_empty_string[] = "        ";
64
65 /*
66  * Setup information
67  *
68  * These are initialized so they are in the .data section
69  */
70
71 static int num_standard_resources;
72 static struct resource *standard_resources;
73
74 static struct resource code_resource = { .name = "Kernel code", };
75 static struct resource data_resource = { .name = "Kernel data", };
76 static struct resource bss_resource  = { .name = "Kernel bss", };
77
78 const char *get_system_type(void)
79 {
80         return "generic-loongson-machine";
81 }
82
83 static const char *dmi_string_parse(const struct dmi_header *dm, u8 s)
84 {
85         const u8 *bp = ((u8 *) dm) + dm->length;
86
87         if (s) {
88                 s--;
89                 while (s > 0 && *bp) {
90                         bp += strlen(bp) + 1;
91                         s--;
92                 }
93
94                 if (*bp != 0) {
95                         size_t len = strlen(bp)+1;
96                         size_t cmp_len = len > 8 ? 8 : len;
97
98                         if (!memcmp(bp, dmi_empty_string, cmp_len))
99                                 return dmi_empty_string;
100
101                         return bp;
102                 }
103         }
104
105         return "";
106 }
107
108 static void __init parse_cpu_table(const struct dmi_header *dm)
109 {
110         long freq_temp = 0;
111         char *dmi_data = (char *)dm;
112
113         freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) +
114                         ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK));
115         cpu_clock_freq = freq_temp * 1000000;
116
117         loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
118         loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET);
119
120         pr_info("CpuClock = %llu\n", cpu_clock_freq);
121 }
122
123 static void __init parse_bios_table(const struct dmi_header *dm)
124 {
125         int bios_extern;
126         char *dmi_data = (char *)dm;
127
128         bios_extern = *(dmi_data + SMBIOS_BIOSEXTERN_OFFSET);
129         b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6;
130
131         if (bios_extern & LOONGSON_EFI_ENABLE)
132                 set_bit(EFI_BOOT, &efi.flags);
133         else
134                 clear_bit(EFI_BOOT, &efi.flags);
135 }
136
137 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
138 {
139         switch (dm->type) {
140         case 0x0: /* Extern BIOS */
141                 parse_bios_table(dm);
142                 break;
143         case 0x4: /* Calling interface */
144                 parse_cpu_table(dm);
145                 break;
146         }
147 }
148 static void __init smbios_parse(void)
149 {
150         b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR);
151         b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION);
152         b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE);
153         b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR);
154         b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME);
155         dmi_walk(find_tokens, NULL);
156 }
157
158 static int usermem __initdata;
159
160 static int __init early_parse_mem(char *p)
161 {
162         phys_addr_t start, size;
163
164         if (!p) {
165                 pr_err("mem parameter is empty, do nothing\n");
166                 return -EINVAL;
167         }
168
169         /*
170          * If a user specifies memory size, we
171          * blow away any automatically generated
172          * size.
173          */
174         if (usermem == 0) {
175                 usermem = 1;
176                 memblock_remove(memblock_start_of_DRAM(),
177                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
178         }
179         start = 0;
180         size = memparse(p, &p);
181         if (*p == '@')
182                 start = memparse(p + 1, &p);
183         else {
184                 pr_err("Invalid format!\n");
185                 return -EINVAL;
186         }
187
188         if (!IS_ENABLED(CONFIG_NUMA))
189                 memblock_add(start, size);
190         else
191                 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
192
193         return 0;
194 }
195 early_param("mem", early_parse_mem);
196
197 void __init platform_init(void)
198 {
199         efi_init();
200 #ifdef CONFIG_ACPI_TABLE_UPGRADE
201         acpi_table_upgrade();
202 #endif
203 #ifdef CONFIG_ACPI
204         acpi_gbl_use_default_register_widths = false;
205         acpi_boot_table_init();
206         acpi_boot_init();
207 #endif
208
209 #ifdef CONFIG_NUMA
210         init_numa_memory();
211 #endif
212         dmi_setup();
213         smbios_parse();
214         pr_info("The BIOS Version: %s\n", b_info.bios_version);
215
216         efi_runtime_init();
217 }
218
219 static void __init check_kernel_sections_mem(void)
220 {
221         phys_addr_t start = __pa_symbol(&_text);
222         phys_addr_t size = __pa_symbol(&_end) - start;
223
224         if (!memblock_is_region_memory(start, size)) {
225                 pr_info("Kernel sections are not in the memory maps\n");
226                 memblock_add(start, size);
227         }
228 }
229
230 /*
231  * arch_mem_init - initialize memory management subsystem
232  */
233 static void __init arch_mem_init(char **cmdline_p)
234 {
235         if (usermem)
236                 pr_info("User-defined physical RAM map overwrite\n");
237
238         check_kernel_sections_mem();
239
240         /*
241          * In order to reduce the possibility of kernel panic when failed to
242          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
243          * low memory as small as possible before plat_swiotlb_setup(), so
244          * make sparse_init() using top-down allocation.
245          */
246         memblock_set_bottom_up(false);
247         sparse_init();
248         memblock_set_bottom_up(true);
249
250         plat_swiotlb_setup();
251
252         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
253
254         memblock_dump_all();
255
256         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
257 }
258
259 static void __init resource_init(void)
260 {
261         long i = 0;
262         size_t res_size;
263         struct resource *res;
264         struct memblock_region *region;
265
266         code_resource.start = __pa_symbol(&_text);
267         code_resource.end = __pa_symbol(&_etext) - 1;
268         data_resource.start = __pa_symbol(&_etext);
269         data_resource.end = __pa_symbol(&_edata) - 1;
270         bss_resource.start = __pa_symbol(&__bss_start);
271         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
272
273         num_standard_resources = memblock.memory.cnt;
274         res_size = num_standard_resources * sizeof(*standard_resources);
275         standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
276
277         for_each_mem_region(region) {
278                 res = &standard_resources[i++];
279                 if (!memblock_is_nomap(region)) {
280                         res->name  = "System RAM";
281                         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
282                         res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
283                         res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
284                 } else {
285                         res->name  = "Reserved";
286                         res->flags = IORESOURCE_MEM;
287                         res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
288                         res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
289                 }
290
291                 request_resource(&iomem_resource, res);
292
293                 /*
294                  *  We don't know which RAM region contains kernel data,
295                  *  so we try it repeatedly and let the resource manager
296                  *  test it.
297                  */
298                 request_resource(res, &code_resource);
299                 request_resource(res, &data_resource);
300                 request_resource(res, &bss_resource);
301         }
302 }
303
304 static int __init reserve_memblock_reserved_regions(void)
305 {
306         u64 i, j;
307
308         for (i = 0; i < num_standard_resources; ++i) {
309                 struct resource *mem = &standard_resources[i];
310                 phys_addr_t r_start, r_end, mem_size = resource_size(mem);
311
312                 if (!memblock_is_region_reserved(mem->start, mem_size))
313                         continue;
314
315                 for_each_reserved_mem_range(j, &r_start, &r_end) {
316                         resource_size_t start, end;
317
318                         start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
319                         end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
320
321                         if (start > mem->end || end < mem->start)
322                                 continue;
323
324                         reserve_region_with_split(mem, start, end, "Reserved");
325                 }
326         }
327
328         return 0;
329 }
330 arch_initcall(reserve_memblock_reserved_regions);
331
332 #ifdef CONFIG_SMP
333 static void __init prefill_possible_map(void)
334 {
335         int i, possible;
336
337         possible = num_processors + disabled_cpus;
338         if (possible > nr_cpu_ids)
339                 possible = nr_cpu_ids;
340
341         pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n",
342                         possible, max((possible - num_processors), 0));
343
344         for (i = 0; i < possible; i++)
345                 set_cpu_possible(i, true);
346         for (; i < NR_CPUS; i++)
347                 set_cpu_possible(i, false);
348
349         nr_cpu_ids = possible;
350 }
351 #endif
352
353 void __init setup_arch(char **cmdline_p)
354 {
355         cpu_probe();
356         *cmdline_p = boot_command_line;
357
358         init_environ();
359         memblock_init();
360         parse_early_param();
361
362         platform_init();
363         pagetable_init();
364         arch_mem_init(cmdline_p);
365
366         resource_init();
367 #ifdef CONFIG_SMP
368         plat_smp_setup();
369         prefill_possible_map();
370 #endif
371
372         paging_init();
373 }