cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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uPD60620.c (2484B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Driver for the Renesas PHY uPD60620.
      4 *
      5 * Copyright (C) 2015 Softing Industrial Automation GmbH
      6 */
      7
      8#include <linux/kernel.h>
      9#include <linux/module.h>
     10#include <linux/phy.h>
     11
     12#define UPD60620_PHY_ID    0xb8242824
     13
     14/* Extended Registers and values */
     15/* PHY Special Control/Status    */
     16#define PHY_PHYSCR         0x1F      /* PHY.31 */
     17#define PHY_PHYSCR_10MB    0x0004    /* PHY speed = 10mb */
     18#define PHY_PHYSCR_100MB   0x0008    /* PHY speed = 100mb */
     19#define PHY_PHYSCR_DUPLEX  0x0010    /* PHY Duplex */
     20
     21/* PHY Special Modes */
     22#define PHY_SPM            0x12      /* PHY.18 */
     23
     24/* Init PHY */
     25
     26static int upd60620_config_init(struct phy_device *phydev)
     27{
     28	/* Enable support for passive HUBs (could be a strap option) */
     29	/* PHYMODE: All speeds, HD in parallel detect */
     30	return phy_write(phydev, PHY_SPM, 0x0180 | phydev->mdio.addr);
     31}
     32
     33/* Get PHY status from common registers */
     34
     35static int upd60620_read_status(struct phy_device *phydev)
     36{
     37	int phy_state;
     38
     39	/* Read negotiated state */
     40	phy_state = phy_read(phydev, MII_BMSR);
     41	if (phy_state < 0)
     42		return phy_state;
     43
     44	phydev->link = 0;
     45	linkmode_zero(phydev->lp_advertising);
     46	phydev->pause = 0;
     47	phydev->asym_pause = 0;
     48
     49	if (phy_state & (BMSR_ANEGCOMPLETE | BMSR_LSTATUS)) {
     50		phy_state = phy_read(phydev, PHY_PHYSCR);
     51		if (phy_state < 0)
     52			return phy_state;
     53
     54		if (phy_state & (PHY_PHYSCR_10MB | PHY_PHYSCR_100MB)) {
     55			phydev->link = 1;
     56			phydev->speed = SPEED_10;
     57			phydev->duplex = DUPLEX_HALF;
     58
     59			if (phy_state & PHY_PHYSCR_100MB)
     60				phydev->speed = SPEED_100;
     61			if (phy_state & PHY_PHYSCR_DUPLEX)
     62				phydev->duplex = DUPLEX_FULL;
     63
     64			phy_state = phy_read(phydev, MII_LPA);
     65			if (phy_state < 0)
     66				return phy_state;
     67
     68			mii_lpa_to_linkmode_lpa_t(phydev->lp_advertising,
     69						  phy_state);
     70
     71			phy_resolve_aneg_pause(phydev);
     72		}
     73	}
     74	return 0;
     75}
     76
     77MODULE_DESCRIPTION("Renesas uPD60620 PHY driver");
     78MODULE_AUTHOR("Bernd Edlinger <bernd.edlinger@hotmail.de>");
     79MODULE_LICENSE("GPL");
     80
     81static struct phy_driver upd60620_driver[1] = { {
     82	.phy_id         = UPD60620_PHY_ID,
     83	.phy_id_mask    = 0xfffffffe,
     84	.name           = "Renesas uPD60620",
     85	/* PHY_BASIC_FEATURES */
     86	.flags          = 0,
     87	.config_init    = upd60620_config_init,
     88	.read_status    = upd60620_read_status,
     89} };
     90
     91module_phy_driver(upd60620_driver);
     92
     93static struct mdio_device_id __maybe_unused upd60620_tbl[] = {
     94	{ UPD60620_PHY_ID, 0xfffffffe },
     95	{ }
     96};
     97
     98MODULE_DEVICE_TABLE(mdio, upd60620_tbl);