linux-kernel - [PATCH net-next v3 2/5] net: stmmac: introduce pcs_init/pcs

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Message-Id: <20240415-rzn1-gmac1-v3-2-ab12f2c4401d@bootlin.com>
Date: Mon, 15 Apr 2024 11:18:42 +0200
From: Romain Gantois <romain.gantois@...tlin.com>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Magnus Damm <magnus.damm@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Jose Abreu <joabreu@...opsys.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 Clément Léger <clement.leger@...tlin.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-renesas-soc@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
 linux-arm-kernel@...ts.infradead.org, 
 "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, 
 Maxime Chevallier <maxime.chevallier@...tlin.com>, 
 Romain Gantois <romain.gantois@...tlin.com>
Subject: [PATCH net-next v3 2/5] net: stmmac: introduce pcs_init/pcs_exit
 stmmac operations

From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>

Introduce a mechanism whereby platforms can create their PCS instances
prior to the network device being published to userspace, but after
some of the core stmmac initialisation has been completed. This means
that the data structures that platforms need will be available.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Reviewed-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 14 ++++++++++++++
 include/linux/stmmac.h                            |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index fe3498e86de9d..25fa33ae7017b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7208,6 +7208,12 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
 	if (ret)
 		return ret;

+	if (priv->plat->pcs_init) {
+		ret = priv->plat->pcs_init(priv, priv->hw);
+		if (ret)
+			return ret;
+	}
+
 	/* Get the HW capability (new GMAC newer than 3.50a) */
 	priv->hw_cap_support = stmmac_get_hw_features(priv);
 	if (priv->hw_cap_support) {
@@ -7290,6 +7296,12 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
 	return 0;
 }

+static void stmmac_hw_exit(struct stmmac_priv *priv)
+{
+	if (priv->plat->pcs_exit)
+		priv->plat->pcs_exit(priv, priv->hw);
+}
+
 static void stmmac_napi_add(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
@@ -7804,6 +7816,7 @@ int stmmac_dvr_probe(struct device *device,
 	    priv->hw->pcs != STMMAC_PCS_RTBI)
 		stmmac_mdio_unregister(ndev);
 error_mdio_register:
+	stmmac_hw_exit(priv);
 	stmmac_napi_del(ndev);
 error_hw_init:
 	destroy_workqueue(priv->wq);
@@ -7844,6 +7857,7 @@ void stmmac_dvr_remove(struct device *dev)
 	if (priv->hw->pcs != STMMAC_PCS_TBI &&
 	    priv->hw->pcs != STMMAC_PCS_RTBI)
 		stmmac_mdio_unregister(ndev);
+	stmmac_hw_exit(priv);
 	destroy_workqueue(priv->wq);
 	mutex_destroy(&priv->lock);
 	bitmap_free(priv->af_xdp_zc_qps);
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index dfa1828cd756a..941fde506e514 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -285,6 +285,8 @@ struct plat_stmmacenet_data {
 	int (*crosststamp)(ktime_t *device, struct system_counterval_t *system,
 			   void *ctx);
 	void (*dump_debug_regs)(void *priv);
+	int (*pcs_init)(struct stmmac_priv *priv, struct mac_device_info *hw);
+	void (*pcs_exit)(struct stmmac_priv *priv, struct mac_device_info *hw);
 	void *bsp_priv;
 	struct clk *stmmac_clk;
 	struct clk *pclk;

-- 
2.44.0