Add basic support for Cortina PHY drivers. Support only CS4340 for now.
The phys are not compatible with IEEE 802.3 clause 45 registers. Implement
proper read_status support, so that phy polling does not cause bus
register access errors.
The driver should be described using the "ethernet-phy-id" device tree
compatible.
Signed-off-by: Bogdan Purcareata <bogdan.purcare...@nxp.com>
---
v1 -> v2:
- Rename "mdio-cortina.c" to "cortina.c" since it's a phy driver.
- Test probing based on the "ethernet-phy-id" compatible. In the previous
version, getting the phy_id via get_phy_c45_ids() involved an additional
hack. Drop that approach and document probing in the commit message.
drivers/net/phy/Kconfig | 5 +++
drivers/net/phy/Makefile | 1 +
drivers/net/phy/cortina.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 96 insertions(+)
create mode 100644 drivers/net/phy/cortina.c
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 22dea7f..ad09e2d 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -240,6 +240,11 @@ config CICADA_PHY
---help---
Currently supports the cis8204
+config CORTINA_PHY
+ tristate "Cortina quad-10G Ethernet PHY"
+ ---help---
+ Currently supports the CS4340 phy.
+
config DAVICOM_PHY
tristate "Davicom PHYs"
---help---
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 79365be..0de3e20 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_BCM_CYGNUS_PHY) += bcm-cygnus.o
obj-$(CONFIG_BCM_NET_PHYLIB) += bcm-phy-lib.o
obj-$(CONFIG_BROADCOM_PHY) += broadcom.o
obj-$(CONFIG_CICADA_PHY) += cicada.o
+obj-$(CONFIG_CORTINA_PHY) += cortina.o
obj-$(CONFIG_DAVICOM_PHY) += davicom.o
obj-$(CONFIG_DP83640_PHY) += dp83640.o
obj-$(CONFIG_DP83848_PHY) += dp83848.o
diff --git a/drivers/net/phy/cortina.c b/drivers/net/phy/cortina.c
new file mode 100644
index 0000000..6f054ed
--- /dev/null
+++ b/drivers/net/phy/cortina.c
@@ -0,0 +1,90 @@
+/*
+ * Based on code from Cortina Systems, Inc.
+ *
+ * Copyright 2011 Cortina Systems, Inc.
+ * Copyright 2017 NXP
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/module.h>
+#include <linux/phy.h>
+
+#define PHY_ID_CS4340 0x13e51002
+
+#define CORTINA_GPIO_GPIO_INTS 0x16D
+
+static int cortina_read_x(struct phy_device *phydev, int off, u16 regnum)
+{
+ return mdiobus_read(phydev->mdio.bus, phydev->mdio.addr + off,
+ MII_ADDR_C45 | regnum);
+}
+
+static int cortina_read(struct phy_device *phydev, u16 regnum)
+{
+ return cortina_read_x(phydev, 0, regnum);
+}
+
+static int cortina_config_aneg(struct phy_device *phydev)
+{
+ phydev->supported = SUPPORTED_10000baseT_Full;
+ phydev->advertising = SUPPORTED_10000baseT_Full;
+
+ return 0;
+}
+
+static int cortina_read_status(struct phy_device *phydev)
+{
+ int gpio_int_status;
+ int ret = 0;
+
+ gpio_int_status = cortina_read(phydev, CORTINA_GPIO_GPIO_INTS);
+ if (gpio_int_status < 0) {
+ ret = gpio_int_status;
+ goto err;
+ }
+
+ if (gpio_int_status & 0x8) {
+ phydev->speed = SPEED_10000;
+ phydev->duplex = DUPLEX_FULL;
+ phydev->link = 1;
+ } else {
+ phydev->link = 0;
+ }
+
+err:
+ return ret;
+}
+
+static int cortina_soft_reset(struct phy_device *phydev)
+{
+ return 0;
+}
+
+static struct phy_driver cortina_driver[] = {
+{
+ .phy_id = PHY_ID_CS4340,
+ .phy_id_mask = 0xffffffff,
+ .name = "Cortina CS4340",
+ .config_aneg = cortina_config_aneg,
+ .read_status = cortina_read_status,
+ .soft_reset = cortina_soft_reset,
+},
+};
+
+module_phy_driver(cortina_driver);
+
+static struct mdio_device_id __maybe_unused cortina_tbl[] = {
+ { PHY_ID_CS4340, 0xffffffff},
+ {},
+};
+
+MODULE_DEVICE_TABLE(mdio, cortina_tbl);
--
1.9.1
