Commit 0a205f0f authored by MD Danish Anwar's avatar MD Danish Anwar Committed by David S. Miller
Browse files

net: ti: icssg-prueth: Add support for half duplex operation 



This patch adds support for half duplex operation at 10M and 100M link
speeds for AM654x/AM64x devices.
- Driver configures rand_seed, a random number, in DMEM HD_RAND_SEED_OFFSET
field, which will be used by firmware for Back off time calculation.
- Driver informs FW about half duplex link operation in DMEM
PORT_LINK_SPEED_OFFSET field by setting bit 7 for 10/100M HD.

Hence, the half duplex operation depends on board design the
"ti,half-duplex-capable" property has to be enabled for ICSS-G ports if HW
is capable to perform half duplex.

Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Reviewed-by: default avatarRoger Quadros <rogerq@kernel.org>
Signed-off-by: default avatarMD Danish Anwar <danishanwar@ti.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 927c568d

drivers/net/ethernet/ti/icssg/icssg_config.c

+14 −0
Original line number Diff line number Diff line
@@ -433,6 +433,17 @@ int emac_set_port_state(struct prueth_emac *emac, 
	return ret;

}



void icssg_config_half_duplex(struct prueth_emac *emac)

{

	u32 val;



	if (!emac->half_duplex)

		return;



	val = get_random_u32();

	writel(val, emac->dram.va + HD_RAND_SEED_OFFSET);

}



void icssg_config_set_speed(struct prueth_emac *emac)

{

	u8 fw_speed;
@@ -453,5 +464,8 @@ void icssg_config_set_speed(struct prueth_emac *emac) 
		return;

	}



	if (emac->duplex == DUPLEX_HALF)

		fw_speed |= FW_LINK_SPEED_HD;



	writeb(fw_speed, emac->dram.va + PORT_LINK_SPEED_OFFSET);

}

drivers/net/ethernet/ti/icssg/icssg_prueth.c

+15 −2
Original line number Diff line number Diff line
@@ -1029,6 +1029,8 @@ static void emac_adjust_link(struct net_device *ndev) 
		 * values

		 */

		if (emac->link) {

			if (emac->duplex == DUPLEX_HALF)

				icssg_config_half_duplex(emac);

			/* Set the RGMII cfg for gig en and full duplex */

			icssg_update_rgmii_cfg(prueth->miig_rt, emac);
@@ -1147,9 +1149,13 @@ static int emac_phy_connect(struct prueth_emac *emac) 
		return -ENODEV;

	}



	/* remove unsupported modes */

	if (!emac->half_duplex) {

		dev_dbg(prueth->dev, "half duplex mode is not supported\n");

		phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT);

		phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT);

	}



	/* remove unsupported modes */

	phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);

	phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_Pause_BIT);

	phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_Asym_Pause_BIT);
@@ -2113,6 +2119,10 @@ static int prueth_probe(struct platform_device *pdev) 
				      eth0_node->name);

			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;

	}
@@ -2124,6 +2134,9 @@ static int prueth_probe(struct platform_device *pdev) 
			goto netdev_exit;

		}



		if (of_find_property(eth1_node, "ti,half-duplex-capable", NULL))

			prueth->emac[PRUETH_MAC1]->half_duplex = 1;



		prueth->emac[PRUETH_MAC1]->iep = prueth->iep0;

	}

drivers/net/ethernet/ti/icssg/icssg_prueth.h

+2 −0
Original line number Diff line number Diff line
@@ -145,6 +145,7 @@ struct prueth_emac { 
	struct icss_iep *iep;

	unsigned int rx_ts_enabled : 1;

	unsigned int tx_ts_enabled : 1;

	unsigned int half_duplex : 1;



	/* DMA related */

	struct prueth_tx_chn tx_chns[PRUETH_MAX_TX_QUEUES];
@@ -271,6 +272,7 @@ int icssg_config(struct prueth *prueth, struct prueth_emac *emac, 
int emac_set_port_state(struct prueth_emac *emac,

			enum icssg_port_state_cmd state);

void icssg_config_set_speed(struct prueth_emac *emac);

void icssg_config_half_duplex(struct prueth_emac *emac);



/* Buffer queue helpers */

int icssg_queue_pop(struct prueth *prueth, u8 queue);