netdev - [PATCH v1 net-next] microchip_t1: Add driver for Microchip LAN87XX T1 PHYs

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Date:   Fri, 27 Apr 2018 20:40:28 +0530
From:   Nisar Sayed <Nisar.Sayed@...rochip.com>
To:     <davem@...emloft.net>
CC:     <UNGLinuxDriver@...rochip.com>, <netdev@...r.kernel.org>
Subject: [PATCH v1 net-next] microchip_t1: Add driver for Microchip LAN87XX T1 PHYs

Add driver for Microchip LAN87XX T1 PHYs

This patch support driver for Microchp T1 PHYs.
There will be followup patches to this driver to support T1 PHY
features such as cable diagnostics, signal quality indicator(SQI),
sleep and wakeup (TC10) support.

Signed-off-by: Nisar Sayed <Nisar.Sayed@...rochip.com>
---
v0 - v1:
        * Rename microchipT1phy.c file to microchip_t1.c
        * Remove microchipT1phy.h include file
        * Add SPDX license identifier
        * Remove remove probe and remove functions
        * Update LAN87XX_INTERRUPT_MASK write as suggested
---
 drivers/net/phy/Kconfig        |  5 +++
 drivers/net/phy/Makefile       |  1 +
 drivers/net/phy/microchip_t1.c | 88 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 drivers/net/phy/microchip_t1.c

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index bdfbabb..7b0b351 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -354,6 +354,11 @@ config MICROCHIP_PHY
 	help
 	  Supports the LAN88XX PHYs.
 
+config MICROCHIP_T1_PHY
+	tristate "Microchip T1 PHYs"
+	---help---
+	  Supports the LAN87XX PHYs.
+
 config MICROSEMI_PHY
 	tristate "Microsemi PHYs"
 	---help---
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 01acbcb..3d0550b 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_MESON_GXL_PHY)	+= meson-gxl.o
 obj-$(CONFIG_MICREL_KS8995MA)	+= spi_ks8995.o
 obj-$(CONFIG_MICREL_PHY)	+= micrel.o
 obj-$(CONFIG_MICROCHIP_PHY)	+= microchip.o
+obj-$(CONFIG_MICROCHIP_T1_PHY)	+= microchip_t1.o
 obj-$(CONFIG_MICROSEMI_PHY)	+= mscc.o
 obj-$(CONFIG_NATIONAL_PHY)	+= national.o
 obj-$(CONFIG_QSEMI_PHY)		+= qsemi.o
diff --git a/drivers/net/phy/microchip_t1.c b/drivers/net/phy/microchip_t1.c
new file mode 100644
index 0000000..1f6f299
--- /dev/null
+++ b/drivers/net/phy/microchip_t1.c
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 Microchip Technology
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+
+/* Interrupt Source Register */
+#define LAN87XX_INTERRUPT_SOURCE                (0x18)
+
+/* Interrupt Mask Register */
+#define LAN87XX_INTERRUPT_MASK                  (0x19)
+#define LAN87XX_MASK_LINK_UP                    (0x0004)
+#define LAN87XX_MASK_LINK_DOWN                  (0x0002)
+
+#define DRIVER_AUTHOR	"Nisar Sayed <nisar.sayed@...rochip.com>"
+#define DRIVER_DESC	"Microchip LAN87XX T1 PHY driver"
+
+static int lan87xx_phy_config_intr(struct phy_device *phydev)
+{
+	int rc, val = 0;
+
+	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
+		/* unmask all source and clear them before enable */
+		rc = phy_write(phydev, LAN87XX_INTERRUPT_MASK, 0x7FFF);
+		rc = phy_read(phydev, LAN87XX_INTERRUPT_SOURCE);
+		val = (LAN87XX_MASK_LINK_UP | LAN87XX_MASK_LINK_DOWN);
+	}
+
+	rc = phy_write(phydev, LAN87XX_INTERRUPT_MASK, val);
+
+	return rc < 0 ? rc : 0;
+}
+
+static int lan87xx_phy_ack_interrupt(struct phy_device *phydev)
+{
+	int rc = phy_read(phydev, LAN87XX_INTERRUPT_SOURCE);
+
+	return rc < 0 ? rc : 0;
+}
+
+static struct phy_driver microchip_t1_phy_driver[] = {
+	{
+		.phy_id         = 0x0007c150,
+		.phy_id_mask    = 0xfffffff0,
+		.name           = "Microchip LAN87xx",
+
+		.features       = SUPPORTED_100baseT_Full,
+		.flags          = PHY_HAS_INTERRUPT,
+
+		.config_init    = genphy_config_init,
+		.config_aneg    = genphy_config_aneg,
+
+		.ack_interrupt  = lan87xx_phy_ack_interrupt,
+		.config_intr    = lan87xx_phy_config_intr,
+
+		.suspend        = genphy_suspend,
+		.resume         = genphy_resume,
+	}
+};
+
+module_phy_driver(microchip_t1_phy_driver);
+
+static struct mdio_device_id __maybe_unused microchip_t1_tbl[] = {
+	{ 0x0007c150, 0xfffffff0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(mdio, microchip_t1_tbl);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
-- 
2.14.1