Raul E Rangel | 9bf32b9 | 2021-05-12 17:03:40 -0600 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | #include <acpi/acpigen.h> |
| 4 | #include <assert.h> |
| 5 | #include <commonlib/bsd/helpers.h> |
| 6 | #include <console/console.h> |
| 7 | #include <device/device.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <string.h> |
| 10 | |
| 11 | #include "chip.h" |
| 12 | |
| 13 | #define TZ_DEVICE_PATH "\\_TZ" |
| 14 | /* These defaults should be good enough for most systems */ |
| 15 | #define DEFAULT_TC1 2 |
| 16 | #define DEFAULT_TC2 5 |
| 17 | #define DEFAULT_TSP 10 |
| 18 | |
| 19 | #define CELSIUS_TO_DECI_KELVIN(temp_c) ((temp_c) * 10 + 2731) |
| 20 | #define SECONDS_TO_DECI_SECONDS(s) ((s) * 10) |
| 21 | |
| 22 | static const char *thermal_zone_acpi_name(const struct device *dev) |
| 23 | { |
| 24 | char *name; |
| 25 | |
| 26 | if (dev->path.type != DEVICE_PATH_GENERIC) |
| 27 | return NULL; |
| 28 | |
| 29 | name = malloc(ACPI_NAME_BUFFER_SIZE); |
| 30 | snprintf(name, ACPI_NAME_BUFFER_SIZE, "TM%02X", dev->path.generic.id); |
| 31 | |
| 32 | return name; |
| 33 | } |
| 34 | |
| 35 | static void thermal_zone_fill_ssdt(const struct device *dev) |
| 36 | { |
| 37 | struct drivers_acpi_thermal_zone_config *config = config_of(dev); |
| 38 | const char *scope; |
| 39 | const char *name; |
| 40 | |
| 41 | assert(dev->path.type == DEVICE_PATH_GENERIC); |
| 42 | |
| 43 | if (config->use_acpi1_thermal_zone_scope) |
| 44 | scope = TZ_DEVICE_PATH; |
| 45 | else |
| 46 | scope = acpi_device_scope(dev); |
| 47 | |
| 48 | name = acpi_device_name(dev); |
| 49 | |
| 50 | assert(name); |
| 51 | assert(scope); |
| 52 | |
| 53 | if (!config->temperature_controller) { |
| 54 | printk(BIOS_ERR, "%s: missing temperature_controller\n", dev_path(dev)); |
| 55 | return; |
| 56 | } |
| 57 | |
| 58 | printk(BIOS_INFO, "%s.%s: %s at %s\n", scope, name, dev->chip_ops->name, dev_path(dev)); |
| 59 | |
| 60 | acpigen_write_scope(scope); |
| 61 | acpigen_write_thermal_zone(name); |
| 62 | |
| 63 | if (config->description) |
| 64 | acpigen_write_name_string("_STR", config->description); |
| 65 | |
| 66 | if (config->polling_period) |
| 67 | acpigen_write_name_integer( |
| 68 | "_TZP", SECONDS_TO_DECI_SECONDS(config->polling_period)); |
| 69 | |
| 70 | if (config->critical_temperature) |
| 71 | acpigen_write_name_integer( |
| 72 | "_CRT", CELSIUS_TO_DECI_KELVIN(config->critical_temperature)); |
| 73 | |
| 74 | if (config->hibernate_temperature) |
| 75 | acpigen_write_name_integer( |
| 76 | "_HOT", CELSIUS_TO_DECI_KELVIN(config->hibernate_temperature)); |
| 77 | |
| 78 | if (config->passive_config.temperature) { |
| 79 | acpigen_write_name_integer( |
| 80 | "_PSV", CELSIUS_TO_DECI_KELVIN(config->passive_config.temperature)); |
| 81 | |
| 82 | /* |
| 83 | * The linux kernel currently has an artificial limit of 10 on the number of |
| 84 | * references that can be returned in a list. If we don't respect this limit, |
| 85 | * then the passive threshold won't work. |
| 86 | * |
| 87 | * See https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/third_party/kernel/v5.10/include/acpi/acpi_bus.h;l=19 |
| 88 | */ |
| 89 | acpigen_write_processor_package("_PSL", 0, MIN(10, dev_count_cpu())); |
| 90 | |
| 91 | acpigen_write_name_integer("_TC1", config->passive_config.time_constant_1 |
| 92 | ?: DEFAULT_TC1); |
| 93 | acpigen_write_name_integer("_TC2", config->passive_config.time_constant_2 |
| 94 | ?: DEFAULT_TC2); |
| 95 | acpigen_write_name_integer( |
| 96 | "_TSP", |
| 97 | SECONDS_TO_DECI_SECONDS(config->passive_config.time_sampling_period |
| 98 | ?: DEFAULT_TSP)); |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * Method (_TMP) { |
| 103 | * Return (<path>.TMP(<sensor_id>)) |
| 104 | * } |
| 105 | */ |
| 106 | acpigen_write_method_serialized("_TMP", 0); |
| 107 | acpigen_emit_byte(RETURN_OP); |
| 108 | acpigen_emit_namestring(acpi_device_path_join(config->temperature_controller, "TMP")); |
| 109 | acpigen_write_integer(config->sensor_id); |
| 110 | acpigen_write_method_end(); |
| 111 | |
| 112 | acpigen_write_thermal_zone_end(); |
| 113 | acpigen_write_scope_end(); |
| 114 | } |
| 115 | |
| 116 | static struct device_operations thermal_zone_ops = { |
| 117 | .read_resources = noop_read_resources, |
| 118 | .set_resources = noop_set_resources, |
| 119 | .acpi_name = thermal_zone_acpi_name, |
| 120 | .acpi_fill_ssdt = thermal_zone_fill_ssdt, |
| 121 | }; |
| 122 | |
| 123 | static void thermal_zone_enable_dev(struct device *dev) |
| 124 | { |
| 125 | dev->ops = &thermal_zone_ops; |
| 126 | } |
| 127 | |
| 128 | struct chip_operations drivers_acpi_thermal_zone_ops = { |
| 129 | CHIP_NAME("ACPI Thermal Zone") |
| 130 | .enable_dev = thermal_zone_enable_dev, |
| 131 | }; |