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Message-ID: <20210720115647.15285-1-ms@dev.tdt.de>
Date: Tue, 20 Jul 2021 13:56:47 +0200
From: Martin Schiller <ms@....tdt.de>
To: hauke@...ke-m.de, martin.blumenstingl@...glemail.com,
f.fainelli@...il.com, andrew@...n.ch, hkallweit1@...il.com,
linux@...linux.org.uk, davem@...emloft.net, kuba@...nel.org
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
Martin Schiller <ms@....tdt.de>
Subject: [PATCH net-next v7] net: phy: intel-xway: Add RGMII internal delay configuration
This adds the possibility to configure the RGMII RX/TX clock skew via
devicetree.
Simply set phy mode to "rgmii-id", "rgmii-rxid" or "rgmii-txid" and add
the "rx-internal-delay-ps" or "tx-internal-delay-ps" property to the
devicetree.
Furthermore, a warning is now issued if the phy mode is configured to
"rgmii" and an internal delay is set in the phy (e.g. by pin-strapping),
as in the dp83867 driver.
Signed-off-by: Martin Schiller <ms@....tdt.de>
---
Changes to v6:
o remove warnings if [rx|tx]-internal-delay-ps property is missing
Changes to v5:
o remove #if IS_ENABLED(CONFIG_OF_MDIO) check
o rename new function to xway_gphy_rgmii_init()
Changes to v4:
o Fix Alignment to match open parenthesis
Changes to v3:
o Fix typo in commit message
o use FIELD_PREP() and FIELD_GET() macros
o further code cleanups
o always mask rxskew AND txskew value in the register value
Changes to v2:
o Fix missing whitespace in warning.
Changes to v1:
o code cleanup and use phy_modify().
o use default of 2.0ns if delay property is absent instead of returning
an error.
---
drivers/net/phy/intel-xway.c | 76 ++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
diff --git a/drivers/net/phy/intel-xway.c b/drivers/net/phy/intel-xway.c
index d453ec016168..3c032868ef04 100644
--- a/drivers/net/phy/intel-xway.c
+++ b/drivers/net/phy/intel-xway.c
@@ -8,11 +8,16 @@
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/of.h>
+#include <linux/bitfield.h>
+#define XWAY_MDIO_MIICTRL 0x17 /* mii control */
#define XWAY_MDIO_IMASK 0x19 /* interrupt mask */
#define XWAY_MDIO_ISTAT 0x1A /* interrupt status */
#define XWAY_MDIO_LED 0x1B /* led control */
+#define XWAY_MDIO_MIICTRL_RXSKEW_MASK GENMASK(14, 12)
+#define XWAY_MDIO_MIICTRL_TXSKEW_MASK GENMASK(10, 8)
+
/* bit 15:12 are reserved */
#define XWAY_MDIO_LED_LED3_EN BIT(11) /* Enable the integrated function of LED3 */
#define XWAY_MDIO_LED_LED2_EN BIT(10) /* Enable the integrated function of LED2 */
@@ -157,6 +162,73 @@
#define PHY_ID_PHY11G_VR9_1_2 0xD565A409
#define PHY_ID_PHY22F_VR9_1_2 0xD565A419
+static const int xway_internal_delay[] = {0, 500, 1000, 1500, 2000, 2500,
+ 3000, 3500};
+
+static int xway_gphy_rgmii_init(struct phy_device *phydev)
+{
+ struct device *dev = &phydev->mdio.dev;
+ unsigned int delay_size = ARRAY_SIZE(xway_internal_delay);
+ s32 int_delay;
+ int val = 0;
+
+ if (!phy_interface_is_rgmii(phydev))
+ return 0;
+
+ /* Existing behavior was to use default pin strapping delay in rgmii
+ * mode, but rgmii should have meant no delay. Warn existing users,
+ * but do not change anything at the moment.
+ */
+ if (phydev->interface == PHY_INTERFACE_MODE_RGMII) {
+ u16 txskew, rxskew;
+
+ val = phy_read(phydev, XWAY_MDIO_MIICTRL);
+ if (val < 0)
+ return val;
+
+ txskew = FIELD_GET(XWAY_MDIO_MIICTRL_TXSKEW_MASK, val);
+ rxskew = FIELD_GET(XWAY_MDIO_MIICTRL_RXSKEW_MASK, val);
+
+ if (txskew > 0 || rxskew > 0)
+ phydev_warn(phydev,
+ "PHY has delays (e.g. via pin strapping), but phy-mode = 'rgmii'\n"
+ "Should be 'rgmii-id' to use internal delays txskew:%d ps rxskew:%d ps\n",
+ xway_internal_delay[txskew],
+ xway_internal_delay[rxskew]);
+ return 0;
+ }
+
+ if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+ phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
+ int_delay = phy_get_internal_delay(phydev, dev,
+ xway_internal_delay,
+ delay_size, true);
+
+ /* if rx-internal-delay-ps is missing, use default of 2.0 ns */
+ if (int_delay < 0)
+ int_delay = 4; /* 2000 ps */
+
+ val |= FIELD_PREP(XWAY_MDIO_MIICTRL_RXSKEW_MASK, int_delay);
+ }
+
+ if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+ phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
+ int_delay = phy_get_internal_delay(phydev, dev,
+ xway_internal_delay,
+ delay_size, false);
+
+ /* if tx-internal-delay-ps is missing, use default of 2.0 ns */
+ if (int_delay < 0)
+ int_delay = 4; /* 2000 ps */
+
+ val |= FIELD_PREP(XWAY_MDIO_MIICTRL_TXSKEW_MASK, int_delay);
+ }
+
+ return phy_modify(phydev, XWAY_MDIO_MIICTRL,
+ XWAY_MDIO_MIICTRL_RXSKEW_MASK |
+ XWAY_MDIO_MIICTRL_TXSKEW_MASK, val);
+}
+
static int xway_gphy_config_init(struct phy_device *phydev)
{
int err;
@@ -204,6 +276,10 @@ static int xway_gphy_config_init(struct phy_device *phydev)
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LED2H, ledxh);
phy_write_mmd(phydev, MDIO_MMD_VEND2, XWAY_MMD_LED2L, ledxl);
+ err = xway_gphy_rgmii_init(phydev);
+ if (err)
+ return err;
+
return 0;
}
--
2.20.1
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