linux-kernel - [PATCH 2/2] drivers: phy: Add Cortina CS4340 driver

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Date:   Tue, 23 May 2017 15:53:19 +0000
From:   Bogdan Purcareata <bogdan.purcareata@....com>
To:     <andrew@...n.ch>, <f.fainelli@...il.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] drivers: phy: Add Cortina CS4340 driver

Add basic support for Cortina PHY drivers. Support only CS4340 for now.
The phys are not fully compatible with IEEE 802.3 clause 45 registers.
Implement proper read_status support, so that phy polling does not cause
bus register access errors.

Signed-off-by: Bogdan Purcareata <bogdan.purcareata@....com>
---
 drivers/net/phy/Kconfig        |  5 +++
 drivers/net/phy/Makefile       |  1 +
 drivers/net/phy/mdio-cortina.c | 90 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+)
 create mode 100644 drivers/net/phy/mdio-cortina.c

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 60ffc9d..1d2aeb4 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -82,6 +82,11 @@ config MDIO_BUS_MUX_MMIOREG
 config MDIO_CAVIUM
 	tristate
 
+config MDIO_CORTINA
+	tristate "Driver for Cortina quad-10G Ethernet PHY"
+	---help---
+	  Currently only supports the Cortina CS4340 PHY.
+
 config MDIO_GPIO
 	tristate "GPIO lib-based bitbanged MDIO buses"
 	depends on MDIO_BITBANG && GPIOLIB
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index e36db9a..c82754f 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_MDIO_BUS_MUX_BCM_IPROC)	+= mdio-mux-bcm-iproc.o
 obj-$(CONFIG_MDIO_BUS_MUX_GPIO)	+= mdio-mux-gpio.o
 obj-$(CONFIG_MDIO_BUS_MUX_MMIOREG) += mdio-mux-mmioreg.o
 obj-$(CONFIG_MDIO_CAVIUM)	+= mdio-cavium.o
+obj-$(CONFIG_MDIO_CORTINA)	+= mdio-cortina.o
 obj-$(CONFIG_MDIO_GPIO)		+= mdio-gpio.o
 obj-$(CONFIG_MDIO_HISI_FEMAC)	+= mdio-hisi-femac.o
 obj-$(CONFIG_MDIO_MOXART)	+= mdio-moxart.o
diff --git a/drivers/net/phy/mdio-cortina.c b/drivers/net/phy/mdio-cortina.c
new file mode 100644
index 0000000..2a5c234
--- /dev/null
+++ b/drivers/net/phy/mdio-cortina.c
@@ -0,0 +1,90 @@
+/*
+ *    Based on code from Cortina Systems, Inc.
+ *
+ *    Copyright (C) 2011 Cortina Systems, Inc.
+ *    Copyright (C) 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