Simon Glass | 7ae6976 | 2023-05-04 16:54:58 -0600 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Utility functions for ACPI |
| 4 | * |
| 5 | * Copyright 2023 Google LLC |
| 6 | */ |
| 7 | |
Simon Glass | 7ae6976 | 2023-05-04 16:54:58 -0600 | [diff] [blame] | 8 | #include <mapmem.h> |
Heinrich Schuchardt | 6c2e55a | 2025-03-22 00:21:16 +0100 | [diff] [blame] | 9 | #include <tables_csum.h> |
Simon Glass | 7ae6976 | 2023-05-04 16:54:58 -0600 | [diff] [blame] | 10 | #include <acpi/acpi_table.h> |
| 11 | #include <asm/global_data.h> |
| 12 | |
| 13 | DECLARE_GLOBAL_DATA_PTR; |
| 14 | |
Heinrich Schuchardt | 6c2e55a | 2025-03-22 00:21:16 +0100 | [diff] [blame] | 15 | void acpi_update_checksum(struct acpi_table_header *header) |
| 16 | { |
| 17 | header->checksum = 0; |
| 18 | header->checksum = table_compute_checksum(header, header->length); |
| 19 | } |
| 20 | |
Simon Glass | 7ae6976 | 2023-05-04 16:54:58 -0600 | [diff] [blame] | 21 | struct acpi_table_header *acpi_find_table(const char *sig) |
| 22 | { |
| 23 | struct acpi_rsdp *rsdp; |
| 24 | struct acpi_rsdt *rsdt; |
Heinrich Schuchardt | 23c14e1 | 2023-11-18 22:57:26 +0100 | [diff] [blame] | 25 | struct acpi_xsdt *xsdt; |
Simon Glass | 7ae6976 | 2023-05-04 16:54:58 -0600 | [diff] [blame] | 26 | int len, i, count; |
| 27 | |
| 28 | rsdp = map_sysmem(gd_acpi_start(), 0); |
| 29 | if (!rsdp) |
| 30 | return NULL; |
Heinrich Schuchardt | 23c14e1 | 2023-11-18 22:57:26 +0100 | [diff] [blame] | 31 | if (rsdp->xsdt_address) { |
Simon Glass | 919f835 | 2023-12-31 08:25:54 -0700 | [diff] [blame] | 32 | xsdt = nomap_sysmem(rsdp->xsdt_address, 0); |
Heinrich Schuchardt | 23c14e1 | 2023-11-18 22:57:26 +0100 | [diff] [blame] | 33 | len = xsdt->header.length - sizeof(xsdt->header); |
| 34 | count = len / sizeof(u64); |
| 35 | } else { |
| 36 | if (!rsdp->rsdt_address) |
| 37 | return NULL; |
Simon Glass | 919f835 | 2023-12-31 08:25:54 -0700 | [diff] [blame] | 38 | rsdt = nomap_sysmem(rsdp->rsdt_address, 0); |
Heinrich Schuchardt | 23c14e1 | 2023-11-18 22:57:26 +0100 | [diff] [blame] | 39 | len = rsdt->header.length - sizeof(rsdt->header); |
| 40 | count = len / sizeof(u32); |
| 41 | } |
Simon Glass | 7ae6976 | 2023-05-04 16:54:58 -0600 | [diff] [blame] | 42 | for (i = 0; i < count; i++) { |
| 43 | struct acpi_table_header *hdr; |
| 44 | |
Heinrich Schuchardt | 23c14e1 | 2023-11-18 22:57:26 +0100 | [diff] [blame] | 45 | if (rsdp->xsdt_address) |
Simon Glass | 919f835 | 2023-12-31 08:25:54 -0700 | [diff] [blame] | 46 | hdr = nomap_sysmem(xsdt->entry[i], 0); |
Heinrich Schuchardt | 23c14e1 | 2023-11-18 22:57:26 +0100 | [diff] [blame] | 47 | else |
Simon Glass | 919f835 | 2023-12-31 08:25:54 -0700 | [diff] [blame] | 48 | hdr = nomap_sysmem(rsdt->entry[i], 0); |
Simon Glass | 7ae6976 | 2023-05-04 16:54:58 -0600 | [diff] [blame] | 49 | if (!memcmp(hdr->signature, sig, ACPI_NAME_LEN)) |
| 50 | return hdr; |
| 51 | if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN)) { |
| 52 | struct acpi_fadt *fadt = (struct acpi_fadt *)hdr; |
| 53 | |
Heinrich Schuchardt | fc7a0ee | 2023-12-16 09:12:00 +0100 | [diff] [blame] | 54 | if (!memcmp(sig, "DSDT", ACPI_NAME_LEN)) { |
| 55 | void *dsdt; |
| 56 | |
| 57 | if (fadt->header.revision >= 3 && fadt->x_dsdt) |
| 58 | dsdt = nomap_sysmem(fadt->x_dsdt, 0); |
| 59 | else if (fadt->dsdt) |
| 60 | dsdt = nomap_sysmem(fadt->dsdt, 0); |
| 61 | else |
| 62 | dsdt = NULL; |
| 63 | return dsdt; |
| 64 | } |
| 65 | |
| 66 | if (!memcmp(sig, "FACS", ACPI_NAME_LEN)) { |
| 67 | void *facs; |
| 68 | |
| 69 | if (fadt->header.revision >= 3 && |
| 70 | fadt->x_firmware_ctrl) |
| 71 | facs = nomap_sysmem(fadt->x_firmware_ctrl, 0); |
| 72 | else if (fadt->firmware_ctrl) |
| 73 | facs = nomap_sysmem(fadt->firmware_ctrl, 0); |
| 74 | else |
| 75 | facs = NULL; |
| 76 | return facs; |
| 77 | } |
Simon Glass | 7ae6976 | 2023-05-04 16:54:58 -0600 | [diff] [blame] | 78 | } |
| 79 | } |
| 80 | |
| 81 | return NULL; |
| 82 | } |