linux-kernel - [PATCH net-next v4 2/5] net: stmmac: introduce pcs_init/pcs

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Message-Id: <20240424-rzn1-gmac1-v4-2-852a5f2ce0c0@bootlin.com>
Date: Wed, 24 Apr 2024 11:06:20 +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>, 
 Serge Semin <fancer.lancer@...il.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 v4 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>
[rgantois: removed second parameters of new callbacks]
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 59bf83904b62d..bee9c9ab31a88 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7200,6 +7200,12 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
 	if (ret)
 		return ret;

+	if (priv->plat->pcs_init) {
+		ret = priv->plat->pcs_init(priv);
+		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) {
@@ -7282,6 +7288,12 @@ 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);
+}
+
 static void stmmac_napi_add(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
@@ -7795,6 +7807,7 @@ 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);
@@ -7835,6 +7848,7 @@ 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..4a24a246c617d 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);
+	void (*pcs_exit)(struct stmmac_priv *priv);
 	void *bsp_priv;
 	struct clk *stmmac_clk;
 	struct clk *pclk;

-- 
2.44.0