octeontx2-af: Add support for CGX link management

CGX LMAC initialization, link status polling etc is done
by low level secure firmware. For link management this patch
adds a interface or communication mechanism between firmware
and this kernel CGX driver.

- Firmware interface specification is defined in cgx_fw_if.h.
- Support to send/receive commands/events to/form firmware.
- events/commands implemented
  * link up
  * link down
  * reading firmware version

Signed-off-by: Linu Cherian <lcherian@marvell.com>
Signed-off-by: Nithya Mani <nmani@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 668 insertions, 4 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
index 6ecae80d50ac..f290b1da6acf 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
@@ -24,16 +24,43 @@
 #define DRV_NAME	"octeontx2-cgx"
 #define DRV_STRING      "Marvell OcteonTX2 CGX/MAC Driver"
 
+/**
+ * struct lmac
+ * @wq_cmd_cmplt:	waitq to keep the process blocked until cmd completion
+ * @cmd_lock:		Lock to serialize the command interface
+ * @resp:		command response
+ * @event_cb:		callback for linkchange events
+ * @cmd_pend:		flag set before new command is started
+ *			flag cleared after command response is received
+ * @cgx:		parent cgx port
+ * @lmac_id:		lmac port id
+ * @name:		lmac port name
+ */
+struct lmac {
+	wait_queue_head_t wq_cmd_cmplt;
+	struct mutex cmd_lock;
+	u64 resp;
+	struct cgx_event_cb event_cb;
+	bool cmd_pend;
+	struct cgx *cgx;
+	u8 lmac_id;
+	char *name;
+};
+
 struct cgx {
 	void __iomem		*reg_base;
 	struct pci_dev		*pdev;
 	u8			cgx_id;
 	u8			lmac_count;
+	struct lmac		*lmac_idmap[MAX_LMAC_PER_CGX];
 	struct list_head	cgx_list;
 };
 
 static LIST_HEAD(cgx_list);
 
+/* CGX PHY management internal APIs */
+static int cgx_fwi_link_change(struct cgx *cgx, int lmac_id, bool en);
+
 /* Supported devices */
 static const struct pci_device_id cgx_id_table[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_OCTEONTX2_CGX) },
@@ -42,11 +69,24 @@ static const struct pci_device_id cgx_id_table[] = {
 
 MODULE_DEVICE_TABLE(pci, cgx_id_table);
 
+static void cgx_write(struct cgx *cgx, u64 lmac, u64 offset, u64 val)
+{
+	writeq(val, cgx->reg_base + (lmac << 18) + offset);
+}
+
 static u64 cgx_read(struct cgx *cgx, u64 lmac, u64 offset)
 {
 	return readq(cgx->reg_base + (lmac << 18) + offset);
 }
 
+static inline struct lmac *lmac_pdata(u8 lmac_id, struct cgx *cgx)
+{
+	if (!cgx || lmac_id >= MAX_LMAC_PER_CGX)
+		return NULL;
+
+	return cgx->lmac_idmap[lmac_id];
+}
+
 int cgx_get_cgx_cnt(void)
 {
 	struct cgx *cgx_dev;
@@ -82,18 +122,312 @@ void *cgx_get_pdata(int cgx_id)
 }
 EXPORT_SYMBOL(cgx_get_pdata);
 
-static void cgx_lmac_init(struct cgx *cgx)
+/* CGX Firmware interface low level support */
+static int cgx_fwi_cmd_send(u64 req, u64 *resp, struct lmac *lmac)
+{
+	struct cgx *cgx = lmac->cgx;
+	struct device *dev;
+	int err = 0;
+	u64 cmd;
+
+	/* Ensure no other command is in progress */
+	err = mutex_lock_interruptible(&lmac->cmd_lock);
+	if (err)
+		return err;
+
+	/* Ensure command register is free */
+	cmd = cgx_read(cgx, lmac->lmac_id,  CGX_COMMAND_REG);
+	if (FIELD_GET(CMDREG_OWN, cmd) != CGX_CMD_OWN_NS) {
+		err = -EBUSY;
+		goto unlock;
+	}
+
+	/* Update ownership in command request */
+	req = FIELD_SET(CMDREG_OWN, CGX_CMD_OWN_FIRMWARE, req);
+
+	/* Mark this lmac as pending, before we start */
+	lmac->cmd_pend = true;
+
+	/* Start command in hardware */
+	cgx_write(cgx, lmac->lmac_id, CGX_COMMAND_REG, req);
+
+	/* Ensure command is completed without errors */
+	if (!wait_event_timeout(lmac->wq_cmd_cmplt, !lmac->cmd_pend,
+				msecs_to_jiffies(CGX_CMD_TIMEOUT))) {
+		dev = &cgx->pdev->dev;
+		dev_err(dev, "cgx port %d:%d cmd timeout\n",
+			cgx->cgx_id, lmac->lmac_id);
+		err = -EIO;
+		goto unlock;
+	}
+
+	/* we have a valid command response */
+	smp_rmb(); /* Ensure the latest updates are visible */
+	*resp = lmac->resp;
+
+unlock:
+	mutex_unlock(&lmac->cmd_lock);
+
+	return err;
+}
+
+static inline int cgx_fwi_cmd_generic(u64 req, u64 *resp,
+				      struct cgx *cgx, int lmac_id)
+{
+	struct lmac *lmac;
+	int err;
+
+	lmac = lmac_pdata(lmac_id, cgx);
+	if (!lmac)
+		return -ENODEV;
+
+	err = cgx_fwi_cmd_send(req, resp, lmac);
+
+	/* Check for valid response */
+	if (!err) {
+		if (FIELD_GET(EVTREG_STAT, *resp) == CGX_STAT_FAIL)
+			return -EIO;
+		else
+			return 0;
+	}
+
+	return err;
+}
+
+/* Hardware event handlers */
+static inline void cgx_link_change_handler(u64 lstat,
+					   struct lmac *lmac)
+{
+	struct cgx *cgx = lmac->cgx;
+	struct cgx_link_event event;
+	struct device *dev;
+
+	dev = &cgx->pdev->dev;
+
+	event.lstat.link_up = FIELD_GET(RESP_LINKSTAT_UP, lstat);
+	event.lstat.full_duplex = FIELD_GET(RESP_LINKSTAT_FDUPLEX, lstat);
+	event.lstat.speed = FIELD_GET(RESP_LINKSTAT_SPEED, lstat);
+	event.lstat.err_type = FIELD_GET(RESP_LINKSTAT_ERRTYPE, lstat);
+
+	event.cgx_id = cgx->cgx_id;
+	event.lmac_id = lmac->lmac_id;
+
+	if (!lmac->event_cb.notify_link_chg) {
+		dev_dbg(dev, "cgx port %d:%d Link change handler null",
+			cgx->cgx_id, lmac->lmac_id);
+		if (event.lstat.err_type != CGX_ERR_NONE) {
+			dev_err(dev, "cgx port %d:%d Link error %d\n",
+				cgx->cgx_id, lmac->lmac_id,
+				event.lstat.err_type);
+		}
+		dev_info(dev, "cgx port %d:%d Link status %s, speed %x\n",
+			 cgx->cgx_id, lmac->lmac_id,
+			event.lstat.link_up ? "UP" : "DOWN",
+			event.lstat.speed);
+		return;
+	}
+
+	if (lmac->event_cb.notify_link_chg(&event, lmac->event_cb.data))
+		dev_err(dev, "event notification failure\n");
+}
+
+static inline bool cgx_cmdresp_is_linkevent(u64 event)
+{
+	u8 id;
+
+	id = FIELD_GET(EVTREG_ID, event);
+	if (id == CGX_CMD_LINK_BRING_UP ||
+	    id == CGX_CMD_LINK_BRING_DOWN)
+		return true;
+	else
+		return false;
+}
+
+static inline bool cgx_event_is_linkevent(u64 event)
+{
+	if (FIELD_GET(EVTREG_ID, event) == CGX_EVT_LINK_CHANGE)
+		return true;
+	else
+		return false;
+}
+
+static irqreturn_t cgx_fwi_event_handler(int irq, void *data)
+{
+	struct lmac *lmac = data;
+	struct device *dev;
+	struct cgx *cgx;
+	u64 event;
+
+	cgx = lmac->cgx;
+
+	event = cgx_read(cgx, lmac->lmac_id, CGX_EVENT_REG);
+
+	if (!FIELD_GET(EVTREG_ACK, event))
+		return IRQ_NONE;
+
+	dev = &cgx->pdev->dev;
+
+	switch (FIELD_GET(EVTREG_EVT_TYPE, event)) {
+	case CGX_EVT_CMD_RESP:
+		/* Copy the response. Since only one command is active at a
+		 * time, there is no way a response can get overwritten
+		 */
+		lmac->resp = event;
+		/* Ensure response is updated before thread context starts */
+		smp_wmb();
+
+		/* There wont be separate events for link change initiated from
+		 * software; Hence report the command responses as events
+		 */
+		if (cgx_cmdresp_is_linkevent(event))
+			cgx_link_change_handler(event, lmac);
+
+		/* Release thread waiting for completion  */
+		lmac->cmd_pend = false;
+		wake_up_interruptible(&lmac->wq_cmd_cmplt);
+		break;
+	case CGX_EVT_ASYNC:
+		if (cgx_event_is_linkevent(event))
+			cgx_link_change_handler(event, lmac);
+		break;
+	}
+
+	/* Any new event or command response will be posted by firmware
+	 * only after the current status is acked.
+	 * Ack the interrupt register as well.
+	 */
+	cgx_write(lmac->cgx, lmac->lmac_id, CGX_EVENT_REG, 0);
+	cgx_write(lmac->cgx, lmac->lmac_id, CGXX_CMRX_INT, FW_CGX_INT);
+
+	return IRQ_HANDLED;
+}
+
+/* APIs for PHY management using CGX firmware interface */
+
+/* callback registration for hardware events like link change */
+int cgx_lmac_evh_register(struct cgx_event_cb *cb, void *cgxd, int lmac_id)
+{
+	struct cgx *cgx = cgxd;
+	struct lmac *lmac;
+
+	lmac = lmac_pdata(lmac_id, cgx);
+	if (!lmac)
+		return -ENODEV;
+
+	lmac->event_cb = *cb;
+
+	return 0;
+}
+EXPORT_SYMBOL(cgx_lmac_evh_register);
+
+static int cgx_fwi_link_change(struct cgx *cgx, int lmac_id, bool enable)
+{
+	u64 req = 0;
+	u64 resp;
+
+	if (enable)
+		req = FIELD_SET(CMDREG_ID, CGX_CMD_LINK_BRING_UP, req);
+	else
+		req = FIELD_SET(CMDREG_ID, CGX_CMD_LINK_BRING_DOWN, req);
+
+	return cgx_fwi_cmd_generic(req, &resp, cgx, lmac_id);
+}
+EXPORT_SYMBOL(cgx_fwi_link_change);
+
+static inline int cgx_fwi_read_version(u64 *resp, struct cgx *cgx)
+{
+	u64 req = 0;
+
+	req = FIELD_SET(CMDREG_ID, CGX_CMD_GET_FW_VER, req);
+	return cgx_fwi_cmd_generic(req, resp, cgx, 0);
+}
+
+static int cgx_lmac_verify_fwi_version(struct cgx *cgx)
 {
+	struct device *dev = &cgx->pdev->dev;
+	int major_ver, minor_ver;
+	u64 resp;
+	int err;
+
+	if (!cgx->lmac_count)
+		return 0;
+
+	err = cgx_fwi_read_version(&resp, cgx);
+	if (err)
+		return err;
+
+	major_ver = FIELD_GET(RESP_MAJOR_VER, resp);
+	minor_ver = FIELD_GET(RESP_MINOR_VER, resp);
+	dev_dbg(dev, "Firmware command interface version = %d.%d\n",
+		major_ver, minor_ver);
+	if (major_ver != CGX_FIRMWARE_MAJOR_VER ||
+	    minor_ver != CGX_FIRMWARE_MINOR_VER)
+		return -EIO;
+	else
+		return 0;
+}
+
+static int cgx_lmac_init(struct cgx *cgx)
+{
+	struct lmac *lmac;
+	int i, err;
+
 	cgx->lmac_count = cgx_read(cgx, 0, CGXX_CMRX_RX_LMACS) & 0x7;
 	if (cgx->lmac_count > MAX_LMAC_PER_CGX)
 		cgx->lmac_count = MAX_LMAC_PER_CGX;
+
+	for (i = 0; i < cgx->lmac_count; i++) {
+		lmac = kcalloc(1, sizeof(struct lmac), GFP_KERNEL);
+		if (!lmac)
+			return -ENOMEM;
+		lmac->name = kcalloc(1, sizeof("cgx_fwi_xxx_yyy"), GFP_KERNEL);
+		if (!lmac->name)
+			return -ENOMEM;
+		sprintf(lmac->name, "cgx_fwi_%d_%d", cgx->cgx_id, i);
+		lmac->lmac_id = i;
+		lmac->cgx = cgx;
+		init_waitqueue_head(&lmac->wq_cmd_cmplt);
+		mutex_init(&lmac->cmd_lock);
+		err = request_irq(pci_irq_vector(cgx->pdev,
+						 CGX_LMAC_FWI + i * 9),
+				   cgx_fwi_event_handler, 0, lmac->name, lmac);
+		if (err)
+			return err;
+
+		/* Enable interrupt */
+		cgx_write(cgx, lmac->lmac_id, CGXX_CMRX_INT_ENA_W1S,
+			  FW_CGX_INT);
+
+		/* Add reference */
+		cgx->lmac_idmap[i] = lmac;
+	}
+
+	return cgx_lmac_verify_fwi_version(cgx);
+}
+
+static int cgx_lmac_exit(struct cgx *cgx)
+{
+	struct lmac *lmac;
+	int i;
+
+	/* Free all lmac related resources */
+	for (i = 0; i < cgx->lmac_count; i++) {
+		lmac = cgx->lmac_idmap[i];
+		if (!lmac)
+			continue;
+		free_irq(pci_irq_vector(cgx->pdev, CGX_LMAC_FWI + i * 9), lmac);
+		kfree(lmac->name);
+		kfree(lmac);
+	}
+
+	return 0;
 }
 
 static int cgx_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct device *dev = &pdev->dev;
 	struct cgx *cgx;
-	int err;
+	int err, nvec;
 
 	cgx = devm_kzalloc(dev, sizeof(*cgx), GFP_KERNEL);
 	if (!cgx)
@@ -123,14 +457,27 @@ static int cgx_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto err_release_regions;
 	}
 
+	nvec = CGX_NVEC;
+	err = pci_alloc_irq_vectors(pdev, nvec, nvec, PCI_IRQ_MSIX);
+	if (err < 0 || err != nvec) {
+		dev_err(dev, "Request for %d msix vectors failed, err %d\n",
+			nvec, err);
+		goto err_release_regions;
+	}
+
 	list_add(&cgx->cgx_list, &cgx_list);
 	cgx->cgx_id = cgx_get_cgx_cnt() - 1;
-	cgx_lmac_init(cgx);
+
+	err = cgx_lmac_init(cgx);
+	if (err)
+		goto err_release_lmac;
 
 	return 0;
 
-err_release_regions:
+err_release_lmac:
+	cgx_lmac_exit(cgx);
 	list_del(&cgx->cgx_list);
+err_release_regions:
 	pci_release_regions(pdev);
 err_disable_device:
 	pci_disable_device(pdev);
@@ -142,7 +489,9 @@ static void cgx_remove(struct pci_dev *pdev)
 {
 	struct cgx *cgx = pci_get_drvdata(pdev);
 
+	cgx_lmac_exit(cgx);
 	list_del(&cgx->cgx_list);
+	pci_free_irq_vectors(pdev);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 	pci_set_drvdata(pdev, NULL);
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx.h b/drivers/net/ethernet/marvell/octeontx2/af/cgx.h
index acdc16e89cb4..a2a7a6d72d32 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/cgx.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx.h
@@ -11,6 +11,8 @@
 #ifndef CGX_H
 #define CGX_H
 
+#include "cgx_fw_if.h"
+
  /* PCI device IDs */
 #define	PCI_DEVID_OCTEONTX2_CGX		0xA059
 
@@ -22,12 +24,42 @@
 #define CGX_OFFSET(x)			((x) * MAX_LMAC_PER_CGX)
 
 /* Registers */
+#define CGXX_CMRX_INT			0x040
+#define  FW_CGX_INT				BIT_ULL(1)
+#define CGXX_CMRX_INT_ENA_W1S		0x058
 #define CGXX_CMRX_RX_ID_MAP		0x060
 #define CGXX_CMRX_RX_LMACS		0x128
+#define CGXX_SCRATCH0_REG		0x1050
+#define CGXX_SCRATCH1_REG		0x1058
+#define CGX_CONST			0x2000
+
+#define CGX_COMMAND_REG			CGXX_SCRATCH1_REG
+#define CGX_EVENT_REG			CGXX_SCRATCH0_REG
+#define CGX_CMD_TIMEOUT			2200 /* msecs */
+
+#define CGX_NVEC			37
+#define CGX_LMAC_FWI			0
+
+struct cgx_link_event {
+	struct cgx_lnk_sts lstat;
+	u8 cgx_id;
+	u8 lmac_id;
+};
+
+/**
+ * struct cgx_event_cb
+ * @notify_link_chg:	callback for link change notification
+ * @data:	data passed to callback function
+ */
+struct cgx_event_cb {
+	int (*notify_link_chg)(struct cgx_link_event *event, void *data);
+	void *data;
+};
 
 extern struct pci_driver cgx_driver;
 
 int cgx_get_cgx_cnt(void);
 int cgx_get_lmac_cnt(void *cgxd);
 void *cgx_get_pdata(int cgx_id);
+int cgx_lmac_evh_register(struct cgx_event_cb *cb, void *cgxd, int lmac_id);
 #endif /* CGX_H */
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx_fw_if.h b/drivers/net/ethernet/marvell/octeontx2/af/cgx_fw_if.h
new file mode 100644
index 000000000000..fa17af3f4ba7
--- /dev/null
+++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx_fw_if.h
@@ -0,0 +1,186 @@
+/* SPDX-License-Identifier: GPL-2.0
+ * Marvell OcteonTx2 CGX driver
+ *
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __CGX_FW_INTF_H__
+#define __CGX_FW_INTF_H__
+
+#include <linux/bitops.h>
+#include <linux/bitfield.h>
+
+#define CGX_FIRMWARE_MAJOR_VER		1
+#define CGX_FIRMWARE_MINOR_VER		0
+
+#define CGX_EVENT_ACK                   1UL
+
+/* CGX error types. set for cmd response status as CGX_STAT_FAIL */
+enum cgx_error_type {
+	CGX_ERR_NONE,
+	CGX_ERR_LMAC_NOT_ENABLED,
+	CGX_ERR_LMAC_MODE_INVALID,
+	CGX_ERR_REQUEST_ID_INVALID,
+	CGX_ERR_PREV_ACK_NOT_CLEAR,
+	CGX_ERR_PHY_LINK_DOWN,
+	CGX_ERR_PCS_RESET_FAIL,
+	CGX_ERR_AN_CPT_FAIL,
+	CGX_ERR_TX_NOT_IDLE,
+	CGX_ERR_RX_NOT_IDLE,
+	CGX_ERR_SPUX_BR_BLKLOCK_FAIL,
+	CGX_ERR_SPUX_RX_ALIGN_FAIL,
+	CGX_ERR_SPUX_TX_FAULT,
+	CGX_ERR_SPUX_RX_FAULT,
+	CGX_ERR_SPUX_RESET_FAIL,
+	CGX_ERR_SPUX_AN_RESET_FAIL,
+	CGX_ERR_SPUX_USX_AN_RESET_FAIL,
+	CGX_ERR_SMUX_RX_LINK_NOT_OK,
+	CGX_ERR_PCS_RECV_LINK_FAIL,
+	CGX_ERR_TRAINING_FAIL,
+	CGX_ERR_RX_EQU_FAIL,
+	CGX_ERR_SPUX_BER_FAIL,
+	CGX_ERR_SPUX_RSFEC_ALGN_FAIL,   /* = 22 */
+};
+
+/* LINK speed types */
+enum cgx_link_speed {
+	CGX_LINK_NONE,
+	CGX_LINK_10M,
+	CGX_LINK_100M,
+	CGX_LINK_1G,
+	CGX_LINK_2HG,
+	CGX_LINK_5G,
+	CGX_LINK_10G,
+	CGX_LINK_20G,
+	CGX_LINK_25G,
+	CGX_LINK_40G,
+	CGX_LINK_50G,
+	CGX_LINK_100G,
+	CGX_LINK_SPEED_MAX,
+};
+
+/* REQUEST ID types. Input to firmware */
+enum cgx_cmd_id {
+	CGX_CMD_NONE,
+	CGX_CMD_GET_FW_VER,
+	CGX_CMD_GET_MAC_ADDR,
+	CGX_CMD_SET_MTU,
+	CGX_CMD_GET_LINK_STS,		/* optional to user */
+	CGX_CMD_LINK_BRING_UP,
+	CGX_CMD_LINK_BRING_DOWN,
+	CGX_CMD_INTERNAL_LBK,
+	CGX_CMD_EXTERNAL_LBK,
+	CGX_CMD_HIGIG,
+	CGX_CMD_LINK_STATE_CHANGE,
+	CGX_CMD_MODE_CHANGE,		/* hot plug support */
+	CGX_CMD_INTF_SHUTDOWN,
+	CGX_CMD_IRQ_ENABLE,
+	CGX_CMD_IRQ_DISABLE,
+};
+
+/* async event ids */
+enum cgx_evt_id {
+	CGX_EVT_NONE,
+	CGX_EVT_LINK_CHANGE,
+};
+
+/* event types - cause of interrupt */
+enum cgx_evt_type {
+	CGX_EVT_ASYNC,
+	CGX_EVT_CMD_RESP
+};
+
+enum cgx_stat {
+	CGX_STAT_SUCCESS,
+	CGX_STAT_FAIL
+};
+
+enum cgx_cmd_own {
+	CGX_CMD_OWN_NS,
+	CGX_CMD_OWN_FIRMWARE,
+};
+
+/* m - bit mask
+ * y - value to be written in the bitrange
+ * x - input value whose bitrange to be modified
+ */
+#define FIELD_SET(m, y, x)		\
+	(((x) & ~(m)) |			\
+	FIELD_PREP((m), (y)))
+
+/* scratchx(0) CSR used for ATF->non-secure SW communication.
+ * This acts as the status register
+ * Provides details on command ack/status, command response, error details
+ */
+#define EVTREG_ACK		BIT_ULL(0)
+#define EVTREG_EVT_TYPE		BIT_ULL(1)
+#define EVTREG_STAT		BIT_ULL(2)
+#define EVTREG_ID		GENMASK_ULL(8, 3)
+
+/* Response to command IDs with command status as CGX_STAT_FAIL
+ *
+ * Not applicable for commands :
+ * CGX_CMD_LINK_BRING_UP/DOWN/CGX_EVT_LINK_CHANGE
+ */
+#define EVTREG_ERRTYPE		GENMASK_ULL(18, 9)
+
+/* Response to cmd ID as CGX_CMD_GET_FW_VER with cmd status as
+ * CGX_STAT_SUCCESS
+ */
+#define RESP_MAJOR_VER		GENMASK_ULL(12, 9)
+#define RESP_MINOR_VER		GENMASK_ULL(16, 13)
+
+/* Response to cmd ID as CGX_CMD_GET_MAC_ADDR with cmd status as
+ * CGX_STAT_SUCCESS
+ */
+#define RESP_MAC_ADDR		GENMASK_ULL(56, 9)
+
+/* Response to cmd ID - CGX_CMD_LINK_BRING_UP/DOWN, event ID CGX_EVT_LINK_CHANGE
+ * status can be either CGX_STAT_FAIL or CGX_STAT_SUCCESS
+ *
+ * In case of CGX_STAT_FAIL, it indicates CGX configuration failed
+ * when processing link up/down/change command.
+ * Both err_type and current link status will be updated
+ *
+ * In case of CGX_STAT_SUCCESS, err_type will be CGX_ERR_NONE and current
+ * link status will be updated
+ */
+struct cgx_lnk_sts {
+	uint64_t reserved1:9;
+	uint64_t link_up:1;
+	uint64_t full_duplex:1;
+	uint64_t speed:4;		/* cgx_link_speed */
+	uint64_t err_type:10;
+	uint64_t reserved2:39;
+};
+
+#define RESP_LINKSTAT_UP		GENMASK_ULL(9, 9)
+#define RESP_LINKSTAT_FDUPLEX		GENMASK_ULL(10, 10)
+#define RESP_LINKSTAT_SPEED		GENMASK_ULL(14, 11)
+#define RESP_LINKSTAT_ERRTYPE		GENMASK_ULL(24, 15)
+
+/* scratchx(1) CSR used for non-secure SW->ATF communication
+ * This CSR acts as a command register
+ */
+#define CMDREG_OWN	BIT_ULL(0)
+#define CMDREG_ID	GENMASK_ULL(7, 2)
+
+/* Any command using enable/disable as an argument need
+ * to set this bitfield.
+ * Ex: Loopback, HiGig...
+ */
+#define CMDREG_ENABLE	BIT_ULL(8)
+
+/* command argument to be passed for cmd ID - CGX_CMD_SET_MTU */
+#define CMDMTU_SIZE	GENMASK_ULL(23, 8)
+
+/* command argument to be passed for cmd ID - CGX_CMD_LINK_CHANGE */
+#define CMDLINKCHANGE_LINKUP	BIT_ULL(8)
+#define CMDLINKCHANGE_FULLDPLX	BIT_ULL(9)
+#define CMDLINKCHANGE_SPEED	GENMASK_ULL(13, 10)
+
+#endif /* __CGX_FW_INTF_H__ */
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
new file mode 100644
index 000000000000..bf8150727e24
--- /dev/null
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Marvell OcteonTx2 RVU Admin Function driver
+ *
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include "rvu.h"
+#include "cgx.h"
+
+static inline u8 cgxlmac_id_to_bmap(u8 cgx_id, u8 lmac_id)
+{
+	return ((cgx_id & 0xF) << 4) | (lmac_id & 0xF);
+}
+
+static void *rvu_cgx_pdata(u8 cgx_id, struct rvu *rvu)
+{
+	if (cgx_id >= rvu->cgx_cnt)
+		return NULL;
+
+	return rvu->cgx_idmap[cgx_id];
+}
+
+static int rvu_map_cgx_lmac_pf(struct rvu *rvu)
+{
+	int cgx_cnt = rvu->cgx_cnt;
+	int cgx, lmac_cnt, lmac;
+	int pf = PF_CGXMAP_BASE;
+	int size;
+
+	if (!cgx_cnt)
+		return 0;
+
+	if (cgx_cnt > 0xF || MAX_LMAC_PER_CGX > 0xF)
+		return -EINVAL;
+
+	/* Alloc map table
+	 * An additional entry is required since PF id starts from 1 and
+	 * hence entry at offset 0 is invalid.
+	 */
+	size = (cgx_cnt * MAX_LMAC_PER_CGX + 1) * sizeof(u8);
+	rvu->pf2cgxlmac_map = devm_kzalloc(rvu->dev, size, GFP_KERNEL);
+	if (!rvu->pf2cgxlmac_map)
+		return -ENOMEM;
+
+	/* Initialize offset 0 with an invalid cgx and lmac id */
+	rvu->pf2cgxlmac_map[0] = 0xFF;
+
+	/* Reverse map table */
+	rvu->cgxlmac2pf_map = devm_kzalloc(rvu->dev,
+				  cgx_cnt * MAX_LMAC_PER_CGX * sizeof(u16),
+				  GFP_KERNEL);
+	if (!rvu->cgxlmac2pf_map)
+		return -ENOMEM;
+
+	rvu->cgx_mapped_pfs = 0;
+	for (cgx = 0; cgx < cgx_cnt; cgx++) {
+		lmac_cnt = cgx_get_lmac_cnt(rvu_cgx_pdata(cgx, rvu));
+		for (lmac = 0; lmac < lmac_cnt; lmac++, pf++) {
+			rvu->pf2cgxlmac_map[pf] = cgxlmac_id_to_bmap(cgx, lmac);
+			rvu->cgxlmac2pf_map[CGX_OFFSET(cgx) + lmac] = 1 << pf;
+			rvu->cgx_mapped_pfs++;
+		}
+	}
+	return 0;
+}
+
+int rvu_cgx_probe(struct rvu *rvu)
+{
+	int i;
+
+	/* find available cgx ports */
+	rvu->cgx_cnt = cgx_get_cgx_cnt();
+	if (!rvu->cgx_cnt) {
+		dev_info(rvu->dev, "No CGX devices found!\n");
+		return -ENODEV;
+	}
+
+	rvu->cgx_idmap = devm_kzalloc(rvu->dev, rvu->cgx_cnt * sizeof(void *),
+				      GFP_KERNEL);
+	if (!rvu->cgx_idmap)
+		return -ENOMEM;
+
+	/* Initialize the cgxdata table */
+	for (i = 0; i < rvu->cgx_cnt; i++)
+		rvu->cgx_idmap[i] = cgx_get_pdata(i);
+
+	/* Map CGX LMAC interfaces to RVU PFs */
+	return rvu_map_cgx_lmac_pf(rvu);
+}