cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

acpi_mdio.c (1741B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * ACPI helpers for the MDIO (Ethernet PHY) API
      4 *
      5 * This file provides helper functions for extracting PHY device information
      6 * out of the ACPI ASL and using it to populate an mii_bus.
      7 */
      8
      9#include <linux/acpi.h>
     10#include <linux/acpi_mdio.h>
     11#include <linux/bits.h>
     12#include <linux/dev_printk.h>
     13#include <linux/fwnode_mdio.h>
     14#include <linux/module.h>
     15#include <linux/types.h>
     16
     17MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
     18MODULE_LICENSE("GPL");
     19
     20/**
     21 * acpi_mdiobus_register - Register mii_bus and create PHYs from the ACPI ASL.
     22 * @mdio: pointer to mii_bus structure
     23 * @fwnode: pointer to fwnode of MDIO bus. This fwnode is expected to represent
     24 * an ACPI device object corresponding to the MDIO bus and its children are
     25 * expected to correspond to the PHY devices on that bus.
     26 *
     27 * This function registers the mii_bus structure and registers a phy_device
     28 * for each child node of @fwnode.
     29 */
     30int acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
     31{
     32	struct fwnode_handle *child;
     33	u32 addr;
     34	int ret;
     35
     36	/* Mask out all PHYs from auto probing. */
     37	mdio->phy_mask = GENMASK(31, 0);
     38	ret = mdiobus_register(mdio);
     39	if (ret)
     40		return ret;
     41
     42	ACPI_COMPANION_SET(&mdio->dev, to_acpi_device_node(fwnode));
     43
     44	/* Loop over the child nodes and register a phy_device for each PHY */
     45	fwnode_for_each_child_node(fwnode, child) {
     46		ret = acpi_get_local_address(ACPI_HANDLE_FWNODE(child), &addr);
     47		if (ret || addr >= PHY_MAX_ADDR)
     48			continue;
     49
     50		ret = fwnode_mdiobus_register_phy(mdio, child, addr);
     51		if (ret == -ENODEV)
     52			dev_err(&mdio->dev,
     53				"MDIO device at address %d is missing.\n",
     54				addr);
     55	}
     56	return 0;
     57}
     58EXPORT_SYMBOL(acpi_mdiobus_register);