[PATCH v4 net-next 1/2] net: phy: mchp: Add interrupt support for Link up and Link down to LAN8814 phy

[Divya Koppera <Divya.Koppera@microchip.com>]

This patch add supports for Link up and Link down interrupts
to LAN8814 phy.

Signed-off-by: Divya Koppera<divya.koppera@microchip.com>
---
v1 -> v2
* Fixed warnings
  Reported-by: kernel test robot <lkp@intel.com>

v2 -> v3
* Splitting 1588 support patch to Link up/down patch
  and 1588 support patch.

v3 -> v4
* Changed MAC API call to phy_trigger_machine.
---
 drivers/net/phy/micrel.c | 65 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 54e0d75203da..3a9d87f5d7c5 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -27,6 +27,14 @@
 #include <linux/of.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/ptp_clock_kernel.h>
+#include <linux/ptp_clock.h>
+#include <linux/ptp_classify.h>
+#include <linux/net_tstamp.h>
+#include <linux/netdevice.h>
+#include <linux/if_vlan.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
 
 /* Operation Mode Strap Override */
 #define MII_KSZPHY_OMSO				0x16
@@ -53,6 +61,31 @@
 #define	KSZPHY_INTCS_STATUS			(KSZPHY_INTCS_LINK_DOWN_STATUS |\
 						 KSZPHY_INTCS_LINK_UP_STATUS)
 
+/* Lan8814 general Interrupt control/status reg in GPHY specific block. */
+#define LAN8814_INTC				0x18
+#define LAN8814_INTC_JABBER			BIT(7)
+#define LAN8814_INTC_RECEIVE_ERR		BIT(6)
+#define LAN8814_INTC_PAGE_RECEIVE		BIT(5)
+#define LAN8814_INTC_PARELLEL			BIT(4)
+#define LAN8814_INTC_LINK_PARTNER_ACK		BIT(3)
+#define LAN8814_INTC_LINK_DOWN			BIT(2)
+#define LAN8814_INTC_REMOTE_FAULT		BIT(1)
+#define LAN8814_INTC_LINK_UP			BIT(0)
+#define LAN8814_INTC_ALL			(LAN8814_INTC_LINK_UP |\
+						 LAN8814_INTC_LINK_DOWN)
+
+#define LAN8814_INTS				0x1B
+#define LAN8814_INTS_JABBER			BIT(7)
+#define LAN8814_INTS_RECEIVE_ERR		BIT(6)
+#define LAN8814_INTS_PAGE_RECEIVE		BIT(5)
+#define LAN8814_INTS_PARELLEL			BIT(4)
+#define LAN8814_INTS_LINK_PARTNER_ACK		BIT(3)
+#define LAN8814_INTS_LINK_DOWN			BIT(2)
+#define LAN8814_INTS_REMOTE_FAULT		BIT(1)
+#define LAN8814_INTS_LINK_UP			BIT(0)
+#define LAN8814_INTS_ALL			(LAN8814_INTS_LINK_UP |\
+						 LAN8814_INTS_LINK_DOWN)
+
 /* PHY Control 1 */
 #define	MII_KSZPHY_CTRL_1			0x1e
 
@@ -76,6 +109,9 @@
 #define MII_KSZPHY_TX_DATA_PAD_SKEW             0x106
 
 #define PS_TO_REG				200
+#define KSZ_EXT_PAGE_ACCESS_CONTROL		0x16
+#define KSZ_EXT_PAGE_ACCESS_ADDRESS_DATA	0x17
+#define OFF_PTP_CONTROL				32 /* PTPv1 only */
 
 struct kszphy_hw_stat {
 	const char *string;
@@ -149,6 +185,33 @@ static int kszphy_extended_read(struct phy_device *phydev,
 	return phy_read(phydev, MII_KSZPHY_EXTREG_READ);
 }
 
+static irqreturn_t lan8814_handle_interrupt(struct phy_device *phydev)
+{
+	int irq_status;
+
+	irq_status = phy_read(phydev, LAN8814_INTS);
+	if (irq_status < 0)
+		return IRQ_NONE;
+
+	if (irq_status & LAN8814_INTS_ALL)
+		phy_trigger_machine(phydev);
+
+	return IRQ_HANDLED;
+}
+
+static int lan8814_config_intr(struct phy_device *phydev)
+{
+	int temp;
+
+	/* enable / disable interrupts */
+	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
+		temp = LAN8814_INTC_ALL;
+	else
+		temp = 0;
+
+	return phy_write(phydev, LAN8814_INTC, temp);
+}
+
 static int kszphy_ack_interrupt(struct phy_device *phydev)
 {
 	/* bit[7..0] int status, which is a read and clear register. */
@@ -1360,6 +1423,8 @@ static struct phy_driver ksphy_driver[] = {
 	.get_stats	= kszphy_get_stats,
 	.suspend	= genphy_suspend,
 	.resume		= kszphy_resume,
+	.config_intr	= lan8814_config_intr,
+	.handle_interrupt = lan8814_handle_interrupt,
 }, {
 	.phy_id		= PHY_ID_KSZ9131,
 	.phy_id_mask	= MICREL_PHY_ID_MASK,
-- 
2.17.1