linux-kernel - [PATCH net-next 1/2] net: stmmac: introduce pcs_init/pcs

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Date: Tue, 02 Apr 2024 16:51:43 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Romain Gantois <romain.gantois@...tlin.com>
Cc: "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>,
	 Clément Léger <clement.leger@...tlin.com>,
	 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
Subject: [PATCH net-next 1/2] net: stmmac: introduce pcs_init/pcs_exit stmmac
 operations

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>
---
 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 fe3498e86de9..25fa33ae7017 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 dfa1828cd756..941fde506e51 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;
-- 
2.30.2