linux-kernel - [PATCH 16/26] net: stmmac: dwmac-qcom-ethqos: prepare the driver for more PHY modes

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Message-Id: <20230612092355.87937-17-brgl@bgdev.pl>
Date:   Mon, 12 Jun 2023 11:23:45 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Vinod Koul <vkoul@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>
Cc:     netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 16/26] net: stmmac: dwmac-qcom-ethqos: prepare the driver for more PHY modes

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

In preparation for supporting SGMII, let's make the code a bit more
generic. Add a new callback for MAC configuration so that we can assign
a different variant of it in the future.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 .../stmicro/stmmac/dwmac-qcom-ethqos.c        | 31 ++++++++++++++++---
 1 file changed, 26 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 21f329d2f7eb..2f96f2c11278 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -92,12 +92,14 @@ struct ethqos_emac_driver_data {
 struct qcom_ethqos {
 	struct platform_device *pdev;
 	void __iomem *rgmii_base;
+	int (*configure_func)(struct qcom_ethqos *ethqos);
 
 	unsigned int rgmii_clk_rate;
 	struct clk *rgmii_clk;
 	struct clk *phyaux_clk;
 	struct phy *serdes_phy;
 	unsigned int speed;
+	int phy_mode;
 
 	const struct ethqos_emac_por *por;
 	unsigned int num_por;
@@ -332,13 +334,11 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
 {
 	struct device *dev = &ethqos->pdev->dev;
 	int phase_shift;
-	int phy_mode;
 	int loopback;
 
 	/* Determine if the PHY adds a 2 ns TX delay or the MAC handles it */
-	phy_mode = device_get_phy_mode(dev);
-	if (phy_mode == PHY_INTERFACE_MODE_RGMII_ID ||
-	    phy_mode == PHY_INTERFACE_MODE_RGMII_TXID)
+	if (ethqos->phy_mode == PHY_INTERFACE_MODE_RGMII_ID ||
+	    ethqos->phy_mode == PHY_INTERFACE_MODE_RGMII_TXID)
 		phase_shift = 0;
 	else
 		phase_shift = RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN;
@@ -485,7 +485,7 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
 	return 0;
 }
 
-static int ethqos_configure(struct qcom_ethqos *ethqos)
+static int ethqos_configure_rgmii(struct qcom_ethqos *ethqos)
 {
 	struct device *dev = &ethqos->pdev->dev;
 	volatile unsigned int dll_lock;
@@ -561,6 +561,11 @@ static int ethqos_configure(struct qcom_ethqos *ethqos)
 	return 0;
 }
 
+static int ethqos_configure(struct qcom_ethqos *ethqos)
+{
+	return ethqos->configure_func(ethqos);
+}
+
 static void ethqos_fix_mac_speed(void *priv, unsigned int speed)
 {
 	struct qcom_ethqos *ethqos = priv;
@@ -660,6 +665,22 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
 		goto out_config_dt;
 	}
 
+	ethqos->phy_mode = device_get_phy_mode(dev);
+	switch (ethqos->phy_mode) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		ethqos->configure_func = ethqos_configure_rgmii;
+		break;
+	case -ENODEV:
+		ret = -ENODEV;
+		goto out_config_dt;
+	default:
+		ret = -EINVAL;
+		goto out_config_dt;
+	}
+
 	ethqos->pdev = pdev;
 	ethqos->rgmii_base = devm_platform_ioremap_resource_byname(pdev, "rgmii");
 	if (IS_ERR(ethqos->rgmii_base)) {
-- 
2.39.2