net: ethernet: mtk_eth_soc: switch to external PCS driver

Now that we got a PCS driver, use it and remove the now redundant
PCS code and it's header macros from the Ethernet driver.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Tested-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 0 insertions, 217 deletions

diff --git a/drivers/net/ethernet/mediatek/mtk_sgmii.c b/drivers/net/ethernet/mediatek/mtk_sgmii.c
deleted file mode 100644
index 61bd9986466a..000000000000
--- a/drivers/net/ethernet/mediatek/mtk_sgmii.c
+++ /dev/null
@@ -1,217 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (c) 2018-2019 MediaTek Inc.
-
-/* A library for MediaTek SGMII circuit
- *
- * Author: Sean Wang <sean.wang@mediatek.com>
- *
- */
-
-#include <linux/mfd/syscon.h>
-#include <linux/of.h>
-#include <linux/phylink.h>
-#include <linux/regmap.h>
-
-#include "mtk_eth_soc.h"
-
-static struct mtk_pcs *pcs_to_mtk_pcs(struct phylink_pcs *pcs)
-{
-	return container_of(pcs, struct mtk_pcs, pcs);
-}
-
-static void mtk_pcs_get_state(struct phylink_pcs *pcs,
-			      struct phylink_link_state *state)
-{
-	struct mtk_pcs *mpcs = pcs_to_mtk_pcs(pcs);
-	unsigned int bm, adv;
-
-	/* Read the BMSR and LPA */
-	regmap_read(mpcs->regmap, SGMSYS_PCS_CONTROL_1, &bm);
-	regmap_read(mpcs->regmap, SGMSYS_PCS_ADVERTISE, &adv);
-
-	phylink_mii_c22_pcs_decode_state(state, FIELD_GET(SGMII_BMSR, bm),
-					 FIELD_GET(SGMII_LPA, adv));
-}
-
-static int mtk_pcs_config(struct phylink_pcs *pcs, unsigned int mode,
-			  phy_interface_t interface,
-			  const unsigned long *advertising,
-			  bool permit_pause_to_mac)
-{
-	bool mode_changed = false, changed, use_an;
-	struct mtk_pcs *mpcs = pcs_to_mtk_pcs(pcs);
-	unsigned int rgc3, sgm_mode, bmcr;
-	int advertise, link_timer;
-
-	advertise = phylink_mii_c22_pcs_encode_advertisement(interface,
-							     advertising);
-	if (advertise < 0)
-		return advertise;
-
-	/* Clearing IF_MODE_BIT0 switches the PCS to BASE-X mode, and
-	 * we assume that fixes it's speed at bitrate = line rate (in
-	 * other words, 1000Mbps or 2500Mbps).
-	 */
-	if (interface == PHY_INTERFACE_MODE_SGMII) {
-		sgm_mode = SGMII_IF_MODE_SGMII;
-		if (phylink_autoneg_inband(mode)) {
-			sgm_mode |= SGMII_REMOTE_FAULT_DIS |
-				    SGMII_SPEED_DUPLEX_AN;
-			use_an = true;
-		} else {
-			use_an = false;
-		}
-	} else if (phylink_autoneg_inband(mode)) {
-		/* 1000base-X or 2500base-X autoneg */
-		sgm_mode = SGMII_REMOTE_FAULT_DIS;
-		use_an = linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
-					   advertising);
-	} else {
-		/* 1000base-X or 2500base-X without autoneg */
-		sgm_mode = 0;
-		use_an = false;
-	}
-
-	if (use_an) {
-		bmcr = SGMII_AN_ENABLE;
-	} else {
-		bmcr = 0;
-	}
-
-	if (mpcs->interface != interface) {
-		link_timer = phylink_get_link_timer_ns(interface);
-		if (link_timer < 0)
-			return link_timer;
-
-		/* PHYA power down */
-		regmap_update_bits(mpcs->regmap, SGMSYS_QPHY_PWR_STATE_CTRL,
-				   SGMII_PHYA_PWD, SGMII_PHYA_PWD);
-
-		/* Reset SGMII PCS state */
-		regmap_update_bits(mpcs->regmap, SGMII_RESERVED_0,
-				   SGMII_SW_RESET, SGMII_SW_RESET);
-
-		if (mpcs->flags & MTK_SGMII_FLAG_PN_SWAP)
-			regmap_update_bits(mpcs->regmap, SGMSYS_QPHY_WRAP_CTRL,
-					   SGMII_PN_SWAP_MASK,
-					   SGMII_PN_SWAP_TX_RX);
-
-		if (interface == PHY_INTERFACE_MODE_2500BASEX)
-			rgc3 = RG_PHY_SPEED_3_125G;
-		else
-			rgc3 = 0;
-
-		/* Configure the underlying interface speed */
-		regmap_update_bits(mpcs->regmap, mpcs->ana_rgc3,
-				   RG_PHY_SPEED_3_125G, rgc3);
-
-		/* Setup the link timer */
-		regmap_write(mpcs->regmap, SGMSYS_PCS_LINK_TIMER, link_timer / 2 / 8);
-
-		mpcs->interface = interface;
-		mode_changed = true;
-	}
-
-	/* Update the advertisement, noting whether it has changed */
-	regmap_update_bits_check(mpcs->regmap, SGMSYS_PCS_ADVERTISE,
-				 SGMII_ADVERTISE, advertise, &changed);
-
-	/* Update the sgmsys mode register */
-	regmap_update_bits(mpcs->regmap, SGMSYS_SGMII_MODE,
-			   SGMII_REMOTE_FAULT_DIS | SGMII_SPEED_DUPLEX_AN |
-			   SGMII_IF_MODE_SGMII, sgm_mode);
-
-	/* Update the BMCR */
-	regmap_update_bits(mpcs->regmap, SGMSYS_PCS_CONTROL_1,
-			   SGMII_AN_ENABLE, bmcr);
-
-	/* Release PHYA power down state
-	 * Only removing bit SGMII_PHYA_PWD isn't enough.
-	 * There are cases when the SGMII_PHYA_PWD register contains 0x9 which
-	 * prevents SGMII from working. The SGMII still shows link but no traffic
-	 * can flow. Writing 0x0 to the PHYA_PWD register fix the issue. 0x0 was
-	 * taken from a good working state of the SGMII interface.
-	 * Unknown how much the QPHY needs but it is racy without a sleep.
-	 * Tested on mt7622 & mt7986.
-	 */
-	usleep_range(50, 100);
-	regmap_write(mpcs->regmap, SGMSYS_QPHY_PWR_STATE_CTRL, 0);
-
-	return changed || mode_changed;
-}
-
-static void mtk_pcs_restart_an(struct phylink_pcs *pcs)
-{
-	struct mtk_pcs *mpcs = pcs_to_mtk_pcs(pcs);
-
-	regmap_update_bits(mpcs->regmap, SGMSYS_PCS_CONTROL_1,
-			   SGMII_AN_RESTART, SGMII_AN_RESTART);
-}
-
-static void mtk_pcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
-			    phy_interface_t interface, int speed, int duplex)
-{
-	struct mtk_pcs *mpcs = pcs_to_mtk_pcs(pcs);
-	unsigned int sgm_mode;
-
-	if (!phylink_autoneg_inband(mode)) {
-		/* Force the speed and duplex setting */
-		if (speed == SPEED_10)
-			sgm_mode = SGMII_SPEED_10;
-		else if (speed == SPEED_100)
-			sgm_mode = SGMII_SPEED_100;
-		else
-			sgm_mode = SGMII_SPEED_1000;
-
-		if (duplex != DUPLEX_FULL)
-			sgm_mode |= SGMII_DUPLEX_HALF;
-
-		regmap_update_bits(mpcs->regmap, SGMSYS_SGMII_MODE,
-				   SGMII_DUPLEX_HALF | SGMII_SPEED_MASK,
-				   sgm_mode);
-	}
-}
-
-static const struct phylink_pcs_ops mtk_pcs_ops = {
-	.pcs_get_state = mtk_pcs_get_state,
-	.pcs_config = mtk_pcs_config,
-	.pcs_an_restart = mtk_pcs_restart_an,
-	.pcs_link_up = mtk_pcs_link_up,
-};
-
-int mtk_sgmii_init(struct mtk_sgmii *ss, struct device_node *r, u32 ana_rgc3)
-{
-	struct device_node *np;
-	int i;
-
-	for (i = 0; i < MTK_MAX_DEVS; i++) {
-		np = of_parse_phandle(r, "mediatek,sgmiisys", i);
-		if (!np)
-			break;
-
-		ss->pcs[i].ana_rgc3 = ana_rgc3;
-		ss->pcs[i].regmap = syscon_node_to_regmap(np);
-
-		ss->pcs[i].flags = 0;
-		if (of_property_read_bool(np, "mediatek,pnswap"))
-			ss->pcs[i].flags |= MTK_SGMII_FLAG_PN_SWAP;
-
-		of_node_put(np);
-		if (IS_ERR(ss->pcs[i].regmap))
-			return PTR_ERR(ss->pcs[i].regmap);
-
-		ss->pcs[i].pcs.ops = &mtk_pcs_ops;
-		ss->pcs[i].pcs.poll = true;
-		ss->pcs[i].interface = PHY_INTERFACE_MODE_NA;
-	}
-
-	return 0;
-}
-
-struct phylink_pcs *mtk_sgmii_select_pcs(struct mtk_sgmii *ss, int id)
-{
-	if (!ss->pcs[id].regmap)
-		return NULL;
-
-	return &ss->pcs[id].pcs;
-}