e1eca1d91c
The Linux kernel can use the ACPI _PLD group information to determine peer ports. Currently to define the group information the devicetree must provide a complete _PLD structure. This change pulls the group information into a separate structure that can be defined in devicetree. This makes it easier to set for USB devices in devicetree that do not need a full custom PLD. This was tested on a sarien board with the USB devices defined by verifying that the USB 2/3 ports are correctly identified with their peer in sysfs. Change-Id: Ifd4cadf0f6c901eb3832ad4e1395904f99c2f5a0 Signed-off-by: Duncan Laurie <dlaurie@google.com> Reviewed-on: https://review.coreboot.org/c/29998 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2018 Google LLC
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <arch/acpi_device.h>
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#include <arch/acpi_pld.h>
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#include <arch/acpigen.h>
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#include <console/console.h>
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#include <device/device.h>
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#include <device/path.h>
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#include <stdint.h>
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#include <string.h>
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#include "chip.h"
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static bool usb_acpi_add_gpios_to_crs(struct drivers_usb_acpi_config *cfg)
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{
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/*
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* Return false if reset GPIO is not provided.
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*/
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if (cfg->reset_gpio.pin_count == 0)
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return false;
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return true;
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}
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static void usb_acpi_fill_ssdt_generator(struct device *dev)
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{
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struct drivers_usb_acpi_config *config = dev->chip_info;
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const char *path = acpi_device_path(dev);
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if (!dev->enabled || !path || !config)
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return;
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/* Don't generate output for hubs, only ports */
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if (config->type == UPC_TYPE_HUB)
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return;
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acpigen_write_scope(path);
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if (config->desc)
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acpigen_write_name_string("_DDN", config->desc);
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acpigen_write_upc(config->type);
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if (config->use_custom_pld) {
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/* Use board defined PLD */
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acpigen_write_pld(&config->custom_pld);
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} else {
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/* Fill PLD strucutre based on port type */
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struct acpi_pld pld;
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acpi_pld_fill_usb(&pld, config->type, &config->group);
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acpigen_write_pld(&pld);
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}
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/* Resources */
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if (usb_acpi_add_gpios_to_crs(config) == true) {
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struct acpi_dp *dsd;
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acpigen_write_name("_CRS");
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acpigen_write_resourcetemplate_header();
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acpi_device_write_gpio(&config->reset_gpio);
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acpigen_write_resourcetemplate_footer();
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dsd = acpi_dp_new_table("_DSD");
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acpi_dp_add_gpio(dsd, "reset-gpio", path, 0, 0,
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config->reset_gpio.polarity);
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acpi_dp_write(dsd);
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}
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acpigen_pop_len();
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printk(BIOS_INFO, "%s: %s at %s\n", path,
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config->desc ? : dev->chip_ops->name, dev_path(dev));
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}
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static struct device_operations usb_acpi_ops = {
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.read_resources = DEVICE_NOOP,
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.set_resources = DEVICE_NOOP,
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.enable_resources = DEVICE_NOOP,
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.scan_bus = &scan_usb_bus,
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.acpi_fill_ssdt_generator = &usb_acpi_fill_ssdt_generator,
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};
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static void usb_acpi_enable(struct device *dev)
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{
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dev->ops = &usb_acpi_ops;
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}
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struct chip_operations drivers_usb_acpi_ops = {
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CHIP_NAME("USB ACPI Device")
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.enable_dev = &usb_acpi_enable
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};
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