| Simon Glass | 4c69a5f | 2020-09-22 12:45:04 -0600 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Generic WiFi ACPI info |
| 4 | * |
| 5 | * Copyright 2019 Google LLC |
| 6 | * Modified from coreboot src/drivers/wifi/generic.c |
| 7 | */ |
| 8 | |
| 9 | #include <common.h> |
| 10 | #include <log.h> |
| 11 | #include <acpi/acpigen.h> |
| 12 | #include <acpi/acpi_device.h> |
| 13 | #include <dm.h> |
| 14 | #include <dm/acpi.h> |
| 15 | |
| 16 | /* WRDS Spec Revision */ |
| 17 | #define WRDS_REVISION 0x0 |
| 18 | |
| 19 | /* EWRD Spec Revision */ |
| 20 | #define EWRD_REVISION 0x0 |
| 21 | |
| 22 | /* WRDS Domain type */ |
| 23 | #define WRDS_DOMAIN_TYPE_WIFI 0x7 |
| 24 | |
| 25 | /* EWRD Domain type */ |
| 26 | #define EWRD_DOMAIN_TYPE_WIFI 0x7 |
| 27 | |
| 28 | /* WGDS Domain type */ |
| 29 | #define WGDS_DOMAIN_TYPE_WIFI 0x7 |
| 30 | |
| 31 | /* |
| 32 | * WIFI ACPI NAME = "WF" + hex value of last 8 bits of dev_path_encode + '\0' |
| 33 | * The above representation returns unique and consistent name every time |
| 34 | * generate_wifi_acpi_name is invoked. The last 8 bits of dev_path_encode is |
| 35 | * chosen since it contains the bus address of the device. |
| 36 | */ |
| 37 | #define WIFI_ACPI_NAME_MAX_LEN 5 |
| 38 | |
| 39 | /** |
| 40 | * struct generic_wifi_config - Data structure to contain common wifi config |
| 41 | * @wake: Wake pin for ACPI _PRW |
| 42 | * @maxsleep: Maximum sleep state to wake from |
| 43 | */ |
| 44 | struct generic_wifi_config { |
| 45 | unsigned int wake; |
| 46 | unsigned int maxsleep; |
| 47 | }; |
| 48 | |
| 49 | static int generic_wifi_fill_ssdt(struct acpi_ctx *ctx, |
| 50 | const struct udevice *dev, |
| 51 | const struct generic_wifi_config *config) |
| 52 | { |
| 53 | char name[ACPI_NAME_MAX]; |
| 54 | char path[ACPI_PATH_MAX]; |
| 55 | pci_dev_t bdf; |
| 56 | u32 address; |
| 57 | int ret; |
| 58 | |
| 59 | ret = acpi_device_path(dev_get_parent(dev), path, sizeof(path)); |
| 60 | if (ret) |
| 61 | return log_msg_ret("path", ret); |
| 62 | ret = acpi_get_name(dev, name); |
| 63 | if (ret) |
| 64 | return log_msg_ret("name", ret); |
| 65 | |
| 66 | /* Device */ |
| 67 | acpigen_write_scope(ctx, path); |
| 68 | acpigen_write_device(ctx, name); |
| 69 | acpigen_write_name_integer(ctx, "_UID", 0); |
| 70 | acpigen_write_name_string(ctx, "_DDN", |
| 71 | dev_read_string(dev, "acpi,ddn")); |
| 72 | |
| 73 | /* Address */ |
| 74 | bdf = dm_pci_get_bdf(dev); |
| 75 | address = (PCI_DEV(bdf) << 16) | PCI_FUNC(bdf); |
| 76 | acpigen_write_name_dword(ctx, "_ADR", address); |
| 77 | |
| 78 | /* Wake capabilities */ |
| 79 | if (config) |
| 80 | acpigen_write_prw(ctx, config->wake, config->maxsleep); |
| 81 | |
| 82 | acpigen_pop_len(ctx); /* Device */ |
| 83 | acpigen_pop_len(ctx); /* Scope */ |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static int intel_wifi_acpi_fill_ssdt(const struct udevice *dev, |
| 89 | struct acpi_ctx *ctx) |
| 90 | { |
| 91 | struct generic_wifi_config config; |
| 92 | bool have_config; |
| 93 | int ret; |
| 94 | |
| 95 | ret = dev_read_u32(dev, "acpi,wake", &config.wake); |
| 96 | have_config = !ret; |
| 97 | /* By default, all intel wifi chips wake from S3 */ |
| 98 | config.maxsleep = 3; |
| 99 | ret = generic_wifi_fill_ssdt(ctx, dev, have_config ? &config : NULL); |
| 100 | if (ret) |
| 101 | return log_msg_ret("wifi", ret); |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | struct acpi_ops wifi_acpi_ops = { |
| 107 | .fill_ssdt = intel_wifi_acpi_fill_ssdt, |
| 108 | }; |
| 109 | |
| 110 | static const struct udevice_id intel_wifi_ids[] = { |
| 111 | { .compatible = "intel,generic-wifi" }, |
| 112 | { } |
| 113 | }; |
| 114 | |
| 115 | U_BOOT_DRIVER(intel_wifi) = { |
| 116 | .name = "intel_wifi", |
| 117 | .id = UCLASS_MISC, |
| 118 | .of_match = intel_wifi_ids, |
| 119 | ACPI_OPS_PTR(&wifi_acpi_ops) |
| 120 | }; |