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From deb8af5243504e379878ae3f9a091b21422d65b2 Mon Sep 17 00:00:00 2001
From: Alexander Couzens <lynxis@fe80.eu>
Date: Tue, 9 Apr 2024 09:30:11 +0200
Subject: [PATCH] net: phy: realtek: configure SerDes mode for rtl822xb PHYs
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The rtl8221b and rtl8226b series support switching SerDes mode between
2500base-x and sgmii based on the negotiated copper speed.
Configure this switching mode according to SerDes modes supported by
host.
There is an additional datasheet for RTL8226B/RTL8221B called
"SERDES MODE SETTING FLOW APPLICATION NOTE" where a sequence is
described to setup interface and rate adapter mode.
However, there is no documentation about the meaning of registers
and bits, it's literally just magic numbers and pseudo-code.
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
[ refactored, dropped HiSGMII mode and changed commit message ]
Signed-off-by: Marek Behún <kabel@kernel.org>
[ changed rtl822x_update_interface() to use vendor register ]
[ always fill in possible interfaces ]
[ only apply to rtl8221b and rtl8226b phy's ]
[ set phydev->rate_matching in .config_init() ]
Signed-off-by: Eric Woudstra <ericwouds@gmail.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: should come before them, without any blank lines. As the
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/phy/realtek.c | 114 ++++++++++++++++++++++++++++++++++++--
1 file changed, 110 insertions(+), 4 deletions(-)
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -54,6 +54,16 @@
RTL8201F_ISR_LINK)
#define RTL8201F_IER 0x13
+#define RTL822X_VND1_SERDES_OPTION 0x697a
+#define RTL822X_VND1_SERDES_OPTION_MODE_MASK GENMASK(5, 0)
+#define RTL822X_VND1_SERDES_OPTION_MODE_2500BASEX_SGMII 0
+#define RTL822X_VND1_SERDES_OPTION_MODE_2500BASEX 2
+
+#define RTL822X_VND1_SERDES_CTRL3 0x7580
+#define RTL822X_VND1_SERDES_CTRL3_MODE_MASK GENMASK(5, 0)
+#define RTL822X_VND1_SERDES_CTRL3_MODE_SGMII 0x02
+#define RTL822X_VND1_SERDES_CTRL3_MODE_2500BASEX 0x16
+
#define RTL8366RB_POWER_SAVE 0x15
#define RTL8366RB_POWER_SAVE_ON BIT(12)
@@ -659,6 +669,63 @@ static int rtl822x_write_mmd(struct phy_
return ret;
}
+static int rtl822xb_config_init(struct phy_device *phydev)
+{
+ bool has_2500, has_sgmii;
+ u16 mode;
+ int ret;
+
+ has_2500 = test_bit(PHY_INTERFACE_MODE_2500BASEX,
+ phydev->host_interfaces) ||
+ phydev->interface == PHY_INTERFACE_MODE_2500BASEX;
+
+ has_sgmii = test_bit(PHY_INTERFACE_MODE_SGMII,
+ phydev->host_interfaces) ||
+ phydev->interface == PHY_INTERFACE_MODE_SGMII;
+
+ /* fill in possible interfaces */
+ __assign_bit(PHY_INTERFACE_MODE_2500BASEX, phydev->possible_interfaces,
+ has_2500);
+ __assign_bit(PHY_INTERFACE_MODE_SGMII, phydev->possible_interfaces,
+ has_sgmii);
+
+ if (!has_2500 && !has_sgmii)
+ return 0;
+
+ /* determine SerDes option mode */
+ if (has_2500 && !has_sgmii) {
+ mode = RTL822X_VND1_SERDES_OPTION_MODE_2500BASEX;
+ phydev->rate_matching = RATE_MATCH_PAUSE;
+ } else {
+ mode = RTL822X_VND1_SERDES_OPTION_MODE_2500BASEX_SGMII;
+ phydev->rate_matching = RATE_MATCH_NONE;
+ }
+
+ /* the following sequence with magic numbers sets up the SerDes
+ * option mode
+ */
+ ret = phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x75f3, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = phy_modify_mmd_changed(phydev, MDIO_MMD_VEND1,
+ RTL822X_VND1_SERDES_OPTION,
+ RTL822X_VND1_SERDES_OPTION_MODE_MASK,
+ mode);
+ if (ret < 0)
+ return ret;
+
+ ret = phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x6a04, 0x0503);
+ if (ret < 0)
+ return ret;
+
+ ret = phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x6f10, 0xd455);
+ if (ret < 0)
+ return ret;
+
+ return phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x6f11, 0x8020);
+}
+
static int rtl822x_get_features(struct phy_device *phydev)
{
int val;
@@ -695,6 +762,28 @@ static int rtl822x_config_aneg(struct ph
return __genphy_config_aneg(phydev, ret);
}
+static void rtl822xb_update_interface(struct phy_device *phydev)
+{
+ int val;
+
+ if (!phydev->link)
+ return;
+
+ /* Change interface according to serdes mode */
+ val = phy_read_mmd(phydev, MDIO_MMD_VEND1, RTL822X_VND1_SERDES_CTRL3);
+ if (val < 0)
+ return;
+
+ switch (val & RTL822X_VND1_SERDES_CTRL3_MODE_MASK) {
+ case RTL822X_VND1_SERDES_CTRL3_MODE_2500BASEX:
+ phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
+ break;
+ case RTL822X_VND1_SERDES_CTRL3_MODE_SGMII:
+ phydev->interface = PHY_INTERFACE_MODE_SGMII;
+ break;
+ }
+}
+
static int rtl822x_read_status(struct phy_device *phydev)
{
int ret;
@@ -716,6 +805,19 @@ static int rtl822x_read_status(struct ph
return rtlgen_get_speed(phydev);
}
+static int rtl822xb_read_status(struct phy_device *phydev)
+{
+ int ret;
+
+ ret = rtl822x_read_status(phydev);
+ if (ret < 0)
+ return ret;
+
+ rtl822xb_update_interface(phydev);
+
+ return 0;
+}
+
static bool rtlgen_supports_2_5gbps(struct phy_device *phydev)
{
int val;
@@ -988,7 +1090,8 @@ static struct phy_driver realtek_drvs[]
.name = "RTL8226B_RTL8221B 2.5Gbps PHY",
.get_features = rtl822x_get_features,
.config_aneg = rtl822x_config_aneg,
- .read_status = rtl822x_read_status,
+ .config_init = rtl822xb_config_init,
+ .read_status = rtl822xb_read_status,
.suspend = genphy_suspend,
.resume = rtlgen_resume,
.read_page = rtl821x_read_page,
@@ -1010,7 +1113,8 @@ static struct phy_driver realtek_drvs[]
.name = "RTL8226B-CG_RTL8221B-CG 2.5Gbps PHY",
.get_features = rtl822x_get_features,
.config_aneg = rtl822x_config_aneg,
- .read_status = rtl822x_read_status,
+ .config_init = rtl822xb_config_init,
+ .read_status = rtl822xb_read_status,
.suspend = genphy_suspend,
.resume = rtlgen_resume,
.read_page = rtl821x_read_page,
@@ -1020,7 +1124,8 @@ static struct phy_driver realtek_drvs[]
.name = "RTL8221B-VB-CG 2.5Gbps PHY",
.get_features = rtl822x_get_features,
.config_aneg = rtl822x_config_aneg,
- .read_status = rtl822x_read_status,
+ .config_init = rtl822xb_config_init,
+ .read_status = rtl822xb_read_status,
.suspend = genphy_suspend,
.resume = rtlgen_resume,
.read_page = rtl821x_read_page,
@@ -1030,7 +1135,8 @@ static struct phy_driver realtek_drvs[]
.name = "RTL8221B-VM-CG 2.5Gbps PHY",
.get_features = rtl822x_get_features,
.config_aneg = rtl822x_config_aneg,
- .read_status = rtl822x_read_status,
+ .config_init = rtl822xb_config_init,
+ .read_status = rtl822xb_read_status,
.suspend = genphy_suspend,
.resume = rtlgen_resume,
.read_page = rtl821x_read_page,
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