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From 924453aa9d2324e5611f8e2b71df746d8f0c79f1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20van=20Dorst?= <opensource@vdorst.com>
Date: Fri, 13 Nov 2020 16:11:32 +0100
Subject: [PATCH] net: phy: at803x: add support for SFP module in
RGMII-to-x-base mode
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: René van Dorst <opensource@vdorst.com>
---
drivers/net/phy/at803x.c | 91 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 91 insertions(+)
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -20,6 +20,8 @@
#include <linux/regulator/driver.h>
#include <linux/regulator/consumer.h>
#include <dt-bindings/net/qca-ar803x.h>
+#include <linux/sfp.h>
+#include <linux/phylink.h>
#define AT803X_SPECIFIC_FUNCTION_CONTROL 0x10
#define AT803X_SFC_ASSERT_CRS BIT(11)
@@ -83,9 +85,18 @@
#define AT803X_MODE_CFG_MASK 0x0F
#define AT803X_MODE_CFG_SGMII 0x01
+#define AT803X_MODE_CFG_BX1000_RGMII_50 0x02
+#define AT803X_MODE_CFG_BX1000_RGMII_75 0x03
+#define AT803X_MODE_FIBER 0x01
+#define AT803X_MODE_COPPER 0x00
#define AT803X_PSSR 0x11 /*PHY-Specific Status Register*/
#define AT803X_PSSR_MR_AN_COMPLETE 0x0200
+#define PSSR_LINK BIT(10)
+#define PSSR_SYNC_STATUS BIT(8)
+#define PSSR_DUPLEX BIT(13)
+#define PSSR_SPEED_1000 BIT(15)
+#define PSSR_SPEED_100 BIT(14)
#define AT803X_DEBUG_REG_0 0x00
#define AT803X_DEBUG_RX_CLK_DLY_EN BIT(15)
@@ -505,10 +516,72 @@ static int at803x_parse_dt(struct phy_de
return 0;
}
+static int at803x_mode(struct phy_device *phydev)
+{
+ int mode;
+
+ mode = phy_read(phydev, AT803X_REG_CHIP_CONFIG) & AT803X_MODE_CFG_MASK;
+
+ if (mode == AT803X_MODE_CFG_BX1000_RGMII_50 ||
+ mode == AT803X_MODE_CFG_BX1000_RGMII_75)
+ return AT803X_MODE_FIBER;
+ return AT803X_MODE_COPPER;
+}
+
+static int at803x_sfp_insert(void *upstream, const struct sfp_eeprom_id *id)
+{
+ __ETHTOOL_DECLARE_LINK_MODE_MASK(at803x_support) = { 0, };
+ __ETHTOOL_DECLARE_LINK_MODE_MASK(support) = { 0, };
+ struct phy_device *phydev = upstream;
+ phy_interface_t iface;
+
+ phylink_set(at803x_support, 1000baseX_Full);
+ /* AT803x only support 1000baseX but SGMII works fine when module runs
+ * at 1Gbit.
+ */
+ phylink_set(at803x_support, 1000baseT_Full);
+
+ sfp_parse_support(phydev->sfp_bus, id, support);
+
+ // Limit to interfaces that both sides support
+ linkmode_and(support, support, at803x_support);
+
+ if (linkmode_empty(support))
+ goto unsupported_mode;
+
+ iface = sfp_select_interface(phydev->sfp_bus, support);
+
+ if (iface != PHY_INTERFACE_MODE_SGMII &&
+ iface != PHY_INTERFACE_MODE_1000BASEX)
+ goto unsupported_mode;
+
+ dev_info(&phydev->mdio.dev, "SFP interface %s", phy_modes(iface));
+
+ return 0;
+
+unsupported_mode:
+ dev_info(&phydev->mdio.dev, "incompatible SFP module inserted;"
+ "Only SGMII at 1Gbit/1000BASEX are supported!\n");
+ return -EINVAL;
+}
+
+static const struct sfp_upstream_ops at803x_sfp_ops = {
+ .attach = phy_sfp_attach,
+ .detach = phy_sfp_detach,
+ .module_insert = at803x_sfp_insert,
+};
+
static int at803x_probe(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
struct at803x_priv *priv;
+ int ret;
+
+ if (at803x_mode(phydev) == AT803X_MODE_FIBER) {
+ ret = phy_sfp_probe(phydev, &at803x_sfp_ops);
+ if (ret < 0)
+ return ret;
+ }
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -709,6 +782,10 @@ static int at803x_read_status(struct phy
{
int ss, err, old_link = phydev->link;
+ /* Handle (Fiber) SGMII to RGMII mode */
+ if (at803x_mode(phydev) == AT803X_MODE_FIBER)
+ return genphy_c37_read_status(phydev);
+
/* Update the link, but return if there was an error */
err = genphy_update_link(phydev);
if (err)
@@ -809,6 +886,12 @@ static int at803x_config_aneg(struct phy
{
int ret;
+ /* Handle (Fiber) SerDes to RGMII mode */
+ if (at803x_mode(phydev) == AT803X_MODE_FIBER) {
+ pr_warn("%s: fiber\n", __func__);
+ return genphy_c37_config_aneg(phydev);
+ }
+
ret = at803x_config_mdix(phydev, phydev->mdix_ctrl);
if (ret < 0)
return ret;
@@ -1110,6 +1193,7 @@ static struct phy_driver at803x_driver[]
/* Qualcomm Atheros AR8031/AR8033 */
PHY_ID_MATCH_EXACT(ATH8031_PHY_ID),
.name = "Qualcomm Atheros AR8031/AR8033",
+ .config_aneg = at803x_config_aneg,
.flags = PHY_POLL_CABLE_TEST,
.probe = at803x_probe,
.remove = at803x_remove,
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