linux-kernel - [PATCH net-next v4 07/12] net: ethernet: oa_tc6: enable open alliance tc6 data communication

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Message-ID: <20240418125648.372526-8-Parthiban.Veerasooran@microchip.com>
Date: Thu, 18 Apr 2024 18:26:43 +0530
From: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
To: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <horms@...nel.org>, <saeedm@...dia.com>,
	<anthony.l.nguyen@...el.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <andrew@...n.ch>, <corbet@....net>,
	<linux-doc@...r.kernel.org>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<devicetree@...r.kernel.org>, <horatiu.vultur@...rochip.com>,
	<ruanjinjie@...wei.com>, <steen.hegelund@...rochip.com>,
	<vladimir.oltean@....com>
CC: <UNGLinuxDriver@...rochip.com>, <Thorsten.Kummermehr@...rochip.com>,
	<Pier.Beruto@...emi.com>, <Selvamani.Rajagopal@...emi.com>,
	<Nicolas.Ferre@...rochip.com>, <benjamin.bigler@...nformulastudent.ch>,
	Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
Subject: [PATCH net-next v4 07/12] net: ethernet: oa_tc6: enable open alliance tc6 data communication

Enabling Configuration Synchronization bit (SYNC) in the Configuration
Register #0 enables data communication in the MAC-PHY. The state of this
bit is reflected in the data footer SYNC bit.

Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
---
 drivers/net/ethernet/oa_tc6.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/net/ethernet/oa_tc6.c b/drivers/net/ethernet/oa_tc6.c
index f04c4c13e8d3..ef7069618319 100644
--- a/drivers/net/ethernet/oa_tc6.c
+++ b/drivers/net/ethernet/oa_tc6.c
@@ -20,6 +20,10 @@
 #define OA_TC6_REG_RESET			0x0003
 #define RESET_SWRESET				BIT(0)	/* Software Reset */
 
+/* Configuration Register #0 */
+#define OA_TC6_REG_CONFIG0			0x0004
+#define CONFIG0_SYNC				BIT(15)
+
 /* Status Register #0 */
 #define OA_TC6_REG_STATUS0			0x0008
 #define STATUS0_RESETC				BIT(6)	/* Reset Complete */
@@ -556,6 +560,21 @@ static int oa_tc6_unmask_macphy_error_interrupts(struct oa_tc6 *tc6)
 	return oa_tc6_write_register(tc6, OA_TC6_REG_INT_MASK0, regval);
 }
 
+static int oa_tc6_enable_data_transfer(struct oa_tc6 *tc6)
+{
+	u32 value;
+	int ret;
+
+	ret = oa_tc6_read_register(tc6, OA_TC6_REG_CONFIG0, &value);
+	if (ret)
+		return ret;
+
+	/* Enable configuration synchronization for data transfer */
+	value |= CONFIG0_SYNC;
+
+	return oa_tc6_write_register(tc6, OA_TC6_REG_CONFIG0, value);
+}
+
 /**
  * oa_tc6_init - allocates and initializes oa_tc6 structure.
  * @spi: device with which data will be exchanged.
@@ -613,7 +632,18 @@ struct oa_tc6 *oa_tc6_init(struct spi_device *spi, struct net_device *netdev)
 		return NULL;
 	}
 
+	ret = oa_tc6_enable_data_transfer(tc6);
+	if (ret) {
+		dev_err(&tc6->spi->dev, "Failed to enable data transfer: %d\n",
+			ret);
+		goto phy_exit;
+	}
+
 	return tc6;
+
+phy_exit:
+	oa_tc6_phy_exit(tc6);
+	return NULL;
 }
 EXPORT_SYMBOL_GPL(oa_tc6_init);
 
-- 
2.34.1