1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Generic code used to generate ACPI tables 4 * 5 * Copyright 2019 Google LLC 6 */ 7 8#include <dm.h> 9#include <cpu.h> 10#include <log.h> 11#include <mapmem.h> 12#include <tables_csum.h> 13#include <version_string.h> 14#include <acpi/acpi_table.h> 15#include <asm/global_data.h> 16#include <dm/acpi.h> 17 18/* 19 * OEM_REVISION is 32-bit unsigned number. It should be increased only when 20 * changing software version. Therefore it should not depend on build time. 21 * U-Boot calculates it from U-Boot version and represent it in hexadecimal 22 * notation. As U-Boot version is in form year.month set low 8 bits to 0x01 23 * to have valid date. So for U-Boot version 2021.04 OEM_REVISION is set to 24 * value 0x20210401. 25 */ 26#define OEM_REVISION ((((version_num / 1000) % 10) << 28) | \ 27 (((version_num / 100) % 10) << 24) | \ 28 (((version_num / 10) % 10) << 20) | \ 29 ((version_num % 10) << 16) | \ 30 (((version_num_patch / 10) % 10) << 12) | \ 31 ((version_num_patch % 10) << 8) | \ 32 0x01) 33 34int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags) 35{ 36 struct acpi_table_header *header = &dmar->header; 37 struct cpu_info info; 38 struct udevice *cpu; 39 int ret; 40 41 ret = uclass_first_device_err(UCLASS_CPU, &cpu); 42 if (ret) 43 return log_msg_ret("cpu", ret); 44 ret = cpu_get_info(cpu, &info); 45 if (ret) 46 return log_msg_ret("info", ret); 47 memset((void *)dmar, 0, sizeof(struct acpi_dmar)); 48 49 /* Fill out header fields. */ 50 acpi_fill_header(&dmar->header, "DMAR"); 51 header->length = sizeof(struct acpi_dmar); 52 header->revision = acpi_get_table_revision(ACPITAB_DMAR); 53 54 dmar->host_address_width = info.address_width - 1; 55 dmar->flags = flags; 56 57 return 0; 58} 59 60int acpi_get_table_revision(enum acpi_tables table) 61{ 62 switch (table) { 63 case ACPITAB_FADT: 64 return ACPI_FADT_REV_ACPI_3_0; 65 case ACPITAB_MADT: 66 return ACPI_MADT_REV_ACPI_3_0; 67 case ACPITAB_MCFG: 68 return ACPI_MCFG_REV_ACPI_3_0; 69 case ACPITAB_TCPA: 70 /* This version and the rest are open-coded */ 71 return 2; 72 case ACPITAB_TPM2: 73 return 4; 74 case ACPITAB_SSDT: /* ACPI 3.0 upto 6.3: 2 */ 75 return 2; 76 case ACPITAB_SRAT: /* ACPI 2.0: 1, ACPI 3.0: 2, ACPI 4.0 to 6.3: 3 */ 77 return 1; /* TODO Should probably be upgraded to 2 */ 78 case ACPITAB_DMAR: 79 return 1; 80 case ACPITAB_SLIT: /* ACPI 2.0 upto 6.3: 1 */ 81 return 1; 82 case ACPITAB_SPMI: /* IMPI 2.0 */ 83 return 5; 84 case ACPITAB_HPET: /* Currently 1. Table added in ACPI 2.0 */ 85 return 1; 86 case ACPITAB_VFCT: /* ACPI 2.0/3.0/4.0: 1 */ 87 return 1; 88 case ACPITAB_IVRS: 89 return IVRS_FORMAT_FIXED; 90 case ACPITAB_DBG2: 91 return 0; 92 case ACPITAB_FACS: /* ACPI 2.0/3.0: 1, ACPI 4.0 to 6.3: 2 */ 93 return 1; 94 case ACPITAB_RSDT: /* ACPI 1.0 upto 6.3: 1 */ 95 return 1; 96 case ACPITAB_XSDT: /* ACPI 2.0 upto 6.3: 1 */ 97 return 1; 98 case ACPITAB_RSDP: /* ACPI 2.0 upto 6.3: 2 */ 99 return 2; 100 case ACPITAB_HEST: 101 return 1; 102 case ACPITAB_NHLT: 103 return 5; 104 case ACPITAB_BERT: 105 return 1; 106 case ACPITAB_SPCR: 107 return 2; 108 default: 109 return -EINVAL; 110 } 111} 112 113void acpi_fill_header(struct acpi_table_header *header, char *signature) 114{ 115 memcpy(header->signature, signature, 4); 116 memcpy(header->oem_id, OEM_ID, 6); 117 memcpy(header->oem_table_id, OEM_TABLE_ID, 8); 118 header->oem_revision = OEM_REVISION; 119 memcpy(header->creator_id, ASLC_ID, 4); 120} 121 122void acpi_align(struct acpi_ctx *ctx) 123{ 124 ctx->current = (void *)ALIGN((ulong)ctx->current, 16); 125} 126 127void acpi_align64(struct acpi_ctx *ctx) 128{ 129 ctx->current = (void *)ALIGN((ulong)ctx->current, 64); 130} 131 132void acpi_inc(struct acpi_ctx *ctx, uint amount) 133{ 134 ctx->current += amount; 135} 136 137void acpi_inc_align(struct acpi_ctx *ctx, uint amount) 138{ 139 ctx->current += amount; 140 acpi_align(ctx); 141} 142 143/** 144 * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length 145 * and checksum. 146 */ 147int acpi_add_table(struct acpi_ctx *ctx, void *table) 148{ 149 int i, entries_num; 150 struct acpi_rsdt *rsdt; 151 struct acpi_xsdt *xsdt; 152 153 /* The RSDT is mandatory while the XSDT is not */ 154 rsdt = ctx->rsdt; 155 156 /* This should always be MAX_ACPI_TABLES */ 157 entries_num = ARRAY_SIZE(rsdt->entry); 158 159 for (i = 0; i < entries_num; i++) { 160 if (rsdt->entry[i] == 0) 161 break; 162 } 163 164 if (i >= entries_num) { 165 log_err("ACPI: Error: too many tables\n"); 166 return -E2BIG; 167 } 168 169 /* Add table to the RSDT */ 170 rsdt->entry[i] = nomap_to_sysmem(table); 171 172 /* Fix RSDT length or the kernel will assume invalid entries */ 173 rsdt->header.length = sizeof(struct acpi_table_header) + 174 (sizeof(u32) * (i + 1)); 175 176 /* Re-calculate checksum */ 177 rsdt->header.checksum = 0; 178 rsdt->header.checksum = table_compute_checksum((u8 *)rsdt, 179 rsdt->header.length); 180 181 /* 182 * And now the same thing for the XSDT. We use the same index as for 183 * now we want the XSDT and RSDT to always be in sync in U-Boot 184 */ 185 xsdt = ctx->xsdt; 186 187 /* Add table to the XSDT */ 188 xsdt->entry[i] = nomap_to_sysmem(table); 189 190 /* Fix XSDT length */ 191 xsdt->header.length = sizeof(struct acpi_table_header) + 192 (sizeof(u64) * (i + 1)); 193 194 /* Re-calculate checksum */ 195 xsdt->header.checksum = 0; 196 xsdt->header.checksum = table_compute_checksum((u8 *)xsdt, 197 xsdt->header.length); 198 199 return 0; 200} 201 202void acpi_create_dbg2(struct acpi_dbg2_header *dbg2, 203 int port_type, int port_subtype, 204 struct acpi_gen_regaddr *address, u32 address_size, 205 const char *device_path) 206{ 207 uintptr_t current; 208 struct acpi_dbg2_device *device; 209 u32 *dbg2_addr_size; 210 struct acpi_table_header *header; 211 size_t path_len; 212 const char *path; 213 char *namespace; 214 215 /* Fill out header fields. */ 216 current = (uintptr_t)dbg2; 217 memset(dbg2, '\0', sizeof(struct acpi_dbg2_header)); 218 header = &dbg2->header; 219 220 header->revision = acpi_get_table_revision(ACPITAB_DBG2); 221 acpi_fill_header(header, "DBG2"); 222 header->creator_revision = ASL_REVISION; 223 224 /* One debug device defined */ 225 dbg2->devices_offset = sizeof(struct acpi_dbg2_header); 226 dbg2->devices_count = 1; 227 current += sizeof(struct acpi_dbg2_header); 228 229 /* Device comes after the header */ 230 device = (struct acpi_dbg2_device *)current; 231 memset(device, 0, sizeof(struct acpi_dbg2_device)); 232 current += sizeof(struct acpi_dbg2_device); 233 234 device->revision = 0; 235 device->address_count = 1; 236 device->port_type = port_type; 237 device->port_subtype = port_subtype; 238 239 /* Base Address comes after device structure */ 240 memcpy((void *)current, address, sizeof(struct acpi_gen_regaddr)); 241 device->base_address_offset = current - (uintptr_t)device; 242 current += sizeof(struct acpi_gen_regaddr); 243 244 /* Address Size comes after address structure */ 245 dbg2_addr_size = (uint32_t *)current; 246 device->address_size_offset = current - (uintptr_t)device; 247 *dbg2_addr_size = address_size; 248 current += sizeof(uint32_t); 249 250 /* Namespace string comes last, use '.' if not provided */ 251 path = device_path ? : "."; 252 /* Namespace string length includes NULL terminator */ 253 path_len = strlen(path) + 1; 254 namespace = (char *)current; 255 device->namespace_string_length = path_len; 256 device->namespace_string_offset = current - (uintptr_t)device; 257 strncpy(namespace, path, path_len); 258 current += path_len; 259 260 /* Update structure lengths and checksum */ 261 device->length = current - (uintptr_t)device; 262 header->length = current - (uintptr_t)dbg2; 263 header->checksum = table_compute_checksum(dbg2, header->length); 264} 265