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Date: Wed, 20 May 2020 07:18:35 -0500
From: Dan Murphy <dmurphy@...com>
To: <andrew@...n.ch>, <f.fainelli@...il.com>, <hkallweit1@...il.com>,
<davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>, Dan Murphy <dmurphy@...com>
Subject: [PATCH net-next v2 4/4] net: dp83869: Add RGMII internal delay configuration
Add RGMII internal delay configuration for Rx and Tx.
Signed-off-by: Dan Murphy <dmurphy@...com>
---
drivers/net/phy/dp83869.c | 84 +++++++++++++++++++++++++++++++++++++++
1 file changed, 84 insertions(+)
diff --git a/drivers/net/phy/dp83869.c b/drivers/net/phy/dp83869.c
index cfb22a21a2e6..f08008050177 100644
--- a/drivers/net/phy/dp83869.c
+++ b/drivers/net/phy/dp83869.c
@@ -99,6 +99,14 @@
#define DP83869_OP_MODE_MII BIT(5)
#define DP83869_SGMII_RGMII_BRIDGE BIT(6)
+/* RGMIIDCTL bits */
+#define DP83869_RGMII_TX_CLK_DELAY_MAX 0xf
+#define DP83869_RGMII_TX_CLK_DELAY_SHIFT 4
+#define DP83869_RGMII_TX_CLK_DELAY_INV (DP83869_RGMII_TX_CLK_DELAY_MAX + 1)
+#define DP83869_RGMII_RX_CLK_DELAY_MAX 0xf
+#define DP83869_RGMII_RX_CLK_DELAY_SHIFT 0
+#define DP83869_RGMII_RX_CLK_DELAY_INV (DP83869_RGMII_RX_CLK_DELAY_MAX + 1)
+
enum {
DP83869_PORT_MIRRORING_KEEP,
DP83869_PORT_MIRRORING_EN,
@@ -108,6 +116,8 @@ enum {
struct dp83869_private {
int tx_fifo_depth;
int rx_fifo_depth;
+ u32 rx_id_delay;
+ u32 tx_id_delay;
int io_impedance;
int port_mirroring;
bool rxctrl_strap_quirk;
@@ -232,6 +242,26 @@ static int dp83869_of_init(struct phy_device *phydev)
&dp83869->tx_fifo_depth))
dp83869->tx_fifo_depth = DP83869_PHYCR_FIFO_DEPTH_4_B_NIB;
+ dp83869->rx_id_delay = DP83869_RGMII_RX_CLK_DELAY_INV;
+ ret = of_property_read_u32(of_node, "ti,rx-internal-delay",
+ &dp83869->rx_id_delay);
+ if (!ret && dp83869->rx_id_delay > DP83869_RGMII_RX_CLK_DELAY_MAX) {
+ phydev_err(phydev,
+ "ti,rx-internal-delay value of %u out of range\n",
+ dp83869->rx_id_delay);
+ return -EINVAL;
+ }
+
+ dp83869->tx_id_delay = DP83869_RGMII_TX_CLK_DELAY_INV;
+ ret = of_property_read_u32(of_node, "ti,tx-internal-delay",
+ &dp83869->tx_id_delay);
+ if (!ret && dp83869->tx_id_delay > DP83869_RGMII_TX_CLK_DELAY_MAX) {
+ phydev_err(phydev,
+ "ti,tx-internal-delay value of %u out of range\n",
+ dp83869->tx_id_delay);
+ return -EINVAL;
+ }
+
return ret;
}
#else
@@ -270,6 +300,29 @@ static int dp83869_configure_rgmii(struct phy_device *phydev,
return ret;
}
+static int dp83869_verify_rgmii_cfg(struct phy_device *phydev)
+{
+ struct dp83869_private *dp83869 = phydev->priv;
+
+ /* RX delay *must* be specified if internal delay of RX is used. */
+ if ((phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+ phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) &&
+ dp83869->rx_id_delay == DP83869_RGMII_RX_CLK_DELAY_INV) {
+ phydev_err(phydev, "ti,rx-internal-delay must be specified\n");
+ return -EINVAL;
+ }
+
+ /* TX delay *must* be specified if internal delay of TX is used. */
+ if ((phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+ phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) &&
+ dp83869->tx_id_delay == DP83869_RGMII_TX_CLK_DELAY_INV) {
+ phydev_err(phydev, "ti,tx-internal-delay must be specified\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int dp83869_configure_mode(struct phy_device *phydev,
struct dp83869_private *dp83869)
{
@@ -371,6 +424,11 @@ static int dp83869_config_init(struct phy_device *phydev)
{
struct dp83869_private *dp83869 = phydev->priv;
int ret, val;
+ u16 delay;
+
+ ret = dp83869_verify_rgmii_cfg(phydev);
+ if (ret)
+ return ret;
ret = dp83869_configure_mode(phydev, dp83869);
if (ret)
@@ -394,6 +452,32 @@ static int dp83869_config_init(struct phy_device *phydev)
dp83869->clk_output_sel <<
DP83869_IO_MUX_CFG_CLK_O_SEL_SHIFT);
+ if (phy_interface_is_rgmii(phydev)) {
+ val = phy_read_mmd(phydev, DP83869_DEVADDR, DP83869_RGMIICTL);
+
+ val &= ~(DP83869_RGMII_TX_CLK_DELAY_EN | DP83869_RGMII_RX_CLK_DELAY_EN);
+ if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
+ val |= (DP83869_RGMII_TX_CLK_DELAY_EN | DP83869_RGMII_RX_CLK_DELAY_EN);
+
+ if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
+ val |= DP83869_RGMII_TX_CLK_DELAY_EN;
+
+ if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
+ val |= DP83869_RGMII_RX_CLK_DELAY_EN;
+
+ phy_write_mmd(phydev, DP83869_DEVADDR, DP83869_RGMIICTL, val);
+
+ delay = 0;
+ if (dp83869->rx_id_delay != DP83869_RGMII_RX_CLK_DELAY_INV)
+ delay |= dp83869->rx_id_delay;
+ if (dp83869->tx_id_delay != DP83869_RGMII_TX_CLK_DELAY_INV)
+ delay |= dp83869->tx_id_delay <<
+ DP83869_RGMII_TX_CLK_DELAY_SHIFT;
+
+ phy_write_mmd(phydev, DP83869_DEVADDR, DP83869_RGMIIDCTL,
+ delay);
+ }
+
return ret;
}
--
2.26.2
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