linux-kernel - [PATCH 1/3] net: ti: icssg-prueth: Enable PTP timestamping support for SR1.0 devices

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Date: Wed, 29 May 2024 17:05:10 +0100
From: Diogo Ivo <diogo.ivo@...mens.com>
To: MD Danish Anwar <danishanwar@...com>, Roger Quadros <rogerq@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Richard Cochran <richardcochran@...il.com>, Nishanth Menon <nm@...com>, 
 Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Jan Kiszka <jan.kiszka@...mens.com>
Cc: linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 Diogo Ivo <diogo.ivo@...mens.com>
Subject: [PATCH 1/3] net: ti: icssg-prueth: Enable PTP timestamping support
 for SR1.0 devices

Enable PTP support for AM65x SR1.0 devices by registering with the IEP
infrastructure in order to expose a PTP clock to userspace.

Signed-off-by: Diogo Ivo <diogo.ivo@...mens.com>
---
 drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c | 49 +++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
index 7b3304bbd7fc..01cad01965dc 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
@@ -1011,16 +1011,42 @@ static int prueth_probe(struct platform_device *pdev)
 	dev_dbg(dev, "sram: pa %llx va %p size %zx\n", prueth->msmcram.pa,
 		prueth->msmcram.va, prueth->msmcram.size);
 
+	prueth->iep0 = icss_iep_get_idx(np, 0);
+	if (IS_ERR(prueth->iep0)) {
+		ret = dev_err_probe(dev, PTR_ERR(prueth->iep0), "iep0 get failed\n");
+		goto free_pool;
+	}
+
+	prueth->iep1 = icss_iep_get_idx(np, 1);
+	if (IS_ERR(prueth->iep1)) {
+		ret = dev_err_probe(dev, PTR_ERR(prueth->iep1), "iep1 get failed\n");
+		goto put_iep0;
+	}
+
+	ret = icss_iep_init(prueth->iep0, NULL, NULL, 0);
+	if (ret) {
+		dev_err_probe(dev, ret, "failed to init iep0\n");
+		goto put_iep;
+	}
+
+	ret = icss_iep_init(prueth->iep1, NULL, NULL, 0);
+	if (ret) {
+		dev_err_probe(dev, ret, "failed to init iep1\n");
+		goto exit_iep0;
+	}
+
 	if (eth0_node) {
 		ret = prueth_netdev_init(prueth, eth0_node);
 		if (ret) {
 			dev_err_probe(dev, ret, "netdev init %s failed\n",
 				      eth0_node->name);
-			goto free_pool;
+			goto exit_iep;
 		}
 
 		if (of_find_property(eth0_node, "ti,half-duplex-capable", NULL))
 			prueth->emac[PRUETH_MAC0]->half_duplex = 1;
+
+		prueth->emac[PRUETH_MAC0]->iep = prueth->iep0;
 	}
 
 	if (eth1_node) {
@@ -1033,6 +1059,8 @@ static int prueth_probe(struct platform_device *pdev)
 
 		if (of_find_property(eth1_node, "ti,half-duplex-capable", NULL))
 			prueth->emac[PRUETH_MAC1]->half_duplex = 1;
+
+		prueth->emac[PRUETH_MAC1]->iep = prueth->iep1;
 	}
 
 	/* register the network devices */
@@ -1091,6 +1119,19 @@ static int prueth_probe(struct platform_device *pdev)
 		prueth_netdev_exit(prueth, eth_node);
 	}
 
+exit_iep:
+	icss_iep_exit(prueth->iep1);
+exit_iep0:
+	icss_iep_exit(prueth->iep0);
+
+put_iep:
+	icss_iep_put(prueth->iep1);
+
+put_iep0:
+	icss_iep_put(prueth->iep0);
+	prueth->iep0 = NULL;
+	prueth->iep1 = NULL;
+
 free_pool:
 	gen_pool_free(prueth->sram_pool,
 		      (unsigned long)prueth->msmcram.va, msmc_ram_size);
@@ -1138,6 +1179,12 @@ static void prueth_remove(struct platform_device *pdev)
 		prueth_netdev_exit(prueth, eth_node);
 	}
 
+	icss_iep_exit(prueth->iep1);
+	icss_iep_exit(prueth->iep0);
+
+	icss_iep_put(prueth->iep1);
+	icss_iep_put(prueth->iep0);
+
 	gen_pool_free(prueth->sram_pool,
 		      (unsigned long)prueth->msmcram.va,
 		      MSMC_RAM_SIZE_SR1);

-- 
2.45.1