mirror of
https://github.com/AsahiLinux/u-boot
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121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Generic WiFi ACPI info
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*
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* Copyright 2019 Google LLC
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* Modified from coreboot src/drivers/wifi/generic.c
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*/
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#include <common.h>
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#include <log.h>
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#include <acpi/acpigen.h>
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#include <acpi/acpi_device.h>
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#include <dm.h>
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#include <dm/acpi.h>
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/* WRDS Spec Revision */
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#define WRDS_REVISION 0x0
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/* EWRD Spec Revision */
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#define EWRD_REVISION 0x0
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/* WRDS Domain type */
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#define WRDS_DOMAIN_TYPE_WIFI 0x7
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/* EWRD Domain type */
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#define EWRD_DOMAIN_TYPE_WIFI 0x7
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/* WGDS Domain type */
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#define WGDS_DOMAIN_TYPE_WIFI 0x7
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/*
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* WIFI ACPI NAME = "WF" + hex value of last 8 bits of dev_path_encode + '\0'
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* The above representation returns unique and consistent name every time
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* generate_wifi_acpi_name is invoked. The last 8 bits of dev_path_encode is
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* chosen since it contains the bus address of the device.
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*/
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#define WIFI_ACPI_NAME_MAX_LEN 5
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/**
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* struct generic_wifi_config - Data structure to contain common wifi config
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* @wake: Wake pin for ACPI _PRW
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* @maxsleep: Maximum sleep state to wake from
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*/
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struct generic_wifi_config {
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unsigned int wake;
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unsigned int maxsleep;
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};
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static int generic_wifi_fill_ssdt(struct acpi_ctx *ctx,
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const struct udevice *dev,
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const struct generic_wifi_config *config)
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{
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char name[ACPI_NAME_MAX];
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char path[ACPI_PATH_MAX];
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pci_dev_t bdf;
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u32 address;
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int ret;
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ret = acpi_device_path(dev_get_parent(dev), path, sizeof(path));
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if (ret)
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return log_msg_ret("path", ret);
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ret = acpi_get_name(dev, name);
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if (ret)
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return log_msg_ret("name", ret);
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/* Device */
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acpigen_write_scope(ctx, path);
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acpigen_write_device(ctx, name);
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acpigen_write_name_integer(ctx, "_UID", 0);
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acpigen_write_name_string(ctx, "_DDN",
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dev_read_string(dev, "acpi,ddn"));
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/* Address */
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bdf = dm_pci_get_bdf(dev);
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address = (PCI_DEV(bdf) << 16) | PCI_FUNC(bdf);
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acpigen_write_name_dword(ctx, "_ADR", address);
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/* Wake capabilities */
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if (config)
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acpigen_write_prw(ctx, config->wake, config->maxsleep);
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acpigen_pop_len(ctx); /* Device */
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acpigen_pop_len(ctx); /* Scope */
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return 0;
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}
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static int intel_wifi_acpi_fill_ssdt(const struct udevice *dev,
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struct acpi_ctx *ctx)
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{
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struct generic_wifi_config config;
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bool have_config;
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int ret;
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ret = dev_read_u32(dev, "acpi,wake", &config.wake);
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have_config = !ret;
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/* By default, all intel wifi chips wake from S3 */
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config.maxsleep = 3;
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ret = generic_wifi_fill_ssdt(ctx, dev, have_config ? &config : NULL);
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if (ret)
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return log_msg_ret("wifi", ret);
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return 0;
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}
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struct acpi_ops wifi_acpi_ops = {
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.fill_ssdt = intel_wifi_acpi_fill_ssdt,
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};
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static const struct udevice_id intel_wifi_ids[] = {
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{ .compatible = "intel,generic-wifi" },
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{ }
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};
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U_BOOT_DRIVER(intel_wifi) = {
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.name = "intel_wifi",
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.id = UCLASS_MISC,
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.of_match = intel_wifi_ids,
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ACPI_OPS_PTR(&wifi_acpi_ops)
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};
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