@@ -12,3 +12,4 @@ mtk_t7xx-y:=	t7xx_pci.o \
 		t7xx_hif_cldma.o  \
 		t7xx_port_proxy.o  \
 		t7xx_port_ctrl_msg.o \
+		t7xx_port_wwan.o \

@@ -51,6 +51,30 @@
 
 static struct t7xx_port_static t7xx_md_ports[] = {
 	{
+		.tx_ch = PORT_CH_UART2_TX,
+		.rx_ch = PORT_CH_UART2_RX,
+		.txq_index = Q_IDX_AT_CMD,
+		.rxq_index = Q_IDX_AT_CMD,
+		.txq_exp_index = 0xff,
+		.rxq_exp_index = 0xff,
+		.path_id = CLDMA_ID_MD,
+		.flags = 0,
+		.ops = &wwan_sub_port_ops,
+		.name = "AT",
+		.port_type = WWAN_PORT_AT,
+	}, {
+		.tx_ch = PORT_CH_MBIM_TX,
+		.rx_ch = PORT_CH_MBIM_RX,
+		.txq_index = Q_IDX_MBIM,
+		.rxq_index = Q_IDX_MBIM,
+		.txq_exp_index = 0,
+		.rxq_exp_index = 0,
+		.path_id = CLDMA_ID_MD,
+		.flags = 0,
+		.ops = &wwan_sub_port_ops,
+		.name = "MBIM",
+		.port_type = WWAN_PORT_MBIM,
+	}, {
 		.tx_ch = PORT_CH_CONTROL_TX,
 		.rx_ch = PORT_CH_CONTROL_RX,
 		.txq_index = Q_IDX_CTRL,

@@ -80,6 +80,7 @@ struct port_msg {
 #define PORT_ENUM_VER_MISMATCH	0x00657272
 
 /* Port operations mapping */
+extern struct port_ops wwan_sub_port_ops;
 extern struct port_ops ctl_port_ops;
 
 int t7xx_port_proxy_send_skb(struct t7xx_port *port, struct sk_buff *skb);

@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ *  Amir Hanania <amir.hanania@intel.com>
+ *  Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
+ *  Haijun Liu <haijun.liu@mediatek.com>
+ *  Moises Veleta <moises.veleta@intel.com>
+ *  Ricardo Martinez<ricardo.martinez@linux.intel.com>
+ *
+ * Contributors:
+ *  Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ *  Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
+ *  Eliot Lee <eliot.lee@intel.com>
+ *  Sreehari Kancharla <sreehari.kancharla@intel.com>
+ */
+
+#include <linux/atomic.h>
+#include <linux/bitfield.h>
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/gfp.h>
+#include <linux/minmax.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/wwan.h>
+
+#include "t7xx_common.h"
+#include "t7xx_port.h"
+#include "t7xx_port_proxy.h"
+#include "t7xx_state_monitor.h"
+
+#define CCCI_HEADROOM		128
+
+static int t7xx_port_ctrl_start(struct wwan_port *port)
+{
+	struct t7xx_port *port_mtk = wwan_port_get_drvdata(port);
+
+	if (atomic_read(&port_mtk->usage_cnt))
+		return -EBUSY;
+
+	atomic_inc(&port_mtk->usage_cnt);
+	return 0;
+}
+
+static void t7xx_port_ctrl_stop(struct wwan_port *port)
+{
+	struct t7xx_port *port_mtk = wwan_port_get_drvdata(port);
+
+	atomic_dec(&port_mtk->usage_cnt);
+}
+
+static int t7xx_port_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)
+{
+	struct t7xx_port *port_private = wwan_port_get_drvdata(port);
+	size_t actual_len, alloc_size, txq_mtu = CLDMA_MTU;
+	struct t7xx_port_static *port_static;
+	unsigned int len, i, packets;
+	struct t7xx_fsm_ctl *ctl;
+	enum md_state md_state;
+
+	len = skb->len;
+	if (!len || !port_private->rx_length_th || !port_private->chan_enable)
+		return -EINVAL;
+
+	port_static = port_private->port_static;
+	ctl = port_private->t7xx_dev->md->fsm_ctl;
+	md_state = t7xx_fsm_get_md_state(ctl);
+	if (md_state == MD_STATE_WAITING_FOR_HS1 || md_state == MD_STATE_WAITING_FOR_HS2) {
+		dev_warn(port_private->dev, "Cannot write to %s port when md_state=%d\n",
+			 port_static->name, md_state);
+		return -ENODEV;
+	}
+
+	alloc_size = min_t(size_t, txq_mtu, len + CCCI_HEADROOM);
+	actual_len = alloc_size - CCCI_HEADROOM;
+	packets = DIV_ROUND_UP(len, txq_mtu - CCCI_HEADROOM);
+
+	for (i = 0; i < packets; i++) {
+		struct ccci_header *ccci_h;
+		struct sk_buff *skb_ccci;
+		int ret;
+
+		if (packets > 1 && packets == i + 1) {
+			actual_len = len % (txq_mtu - CCCI_HEADROOM);
+			alloc_size = actual_len + CCCI_HEADROOM;
+		}
+
+		skb_ccci = __dev_alloc_skb(alloc_size, GFP_KERNEL);
+		if (!skb_ccci)
+			return -ENOMEM;
+
+		ccci_h = skb_put(skb_ccci, sizeof(*ccci_h));
+		t7xx_ccci_header_init(ccci_h, 0, actual_len + sizeof(*ccci_h),
+				      port_static->tx_ch, 0);
+		skb_put_data(skb_ccci, skb->data + i * (txq_mtu - CCCI_HEADROOM), actual_len);
+		t7xx_port_proxy_set_tx_seq_num(port_private, ccci_h);
+
+		ret = t7xx_port_send_skb_to_md(port_private, skb_ccci);
+		if (ret) {
+			dev_kfree_skb_any(skb_ccci);
+			dev_err(port_private->dev, "Write error on %s port, %d\n",
+				port_static->name, ret);
+			return ret;
+		}
+
+		port_private->seq_nums[MTK_TX]++;
+	}
+
+	dev_kfree_skb(skb);
+	return 0;
+}
+
+static const struct wwan_port_ops wwan_ops = {
+	.start = t7xx_port_ctrl_start,
+	.stop = t7xx_port_ctrl_stop,
+	.tx = t7xx_port_ctrl_tx,
+};
+
+static int t7xx_port_wwan_init(struct t7xx_port *port)
+{
+	struct t7xx_port_static *port_static = port->port_static;
+
+	port->rx_length_th = RX_QUEUE_MAXLEN;
+	port->flags |= PORT_F_RX_ADJUST_HEADER;
+
+	if (port_static->rx_ch == PORT_CH_UART2_RX)
+		port->flags |= PORT_F_RX_CH_TRAFFIC;
+
+	if (!port->chan_enable)
+		port->flags |= PORT_F_RX_ALLOW_DROP;
+
+	return 0;
+}
+
+static void t7xx_port_wwan_uninit(struct t7xx_port *port)
+{
+	unsigned long flags;
+
+	if (!port->wwan_port)
+		return;
+
+	spin_lock_irqsave(&port->rx_wq.lock, flags);
+	port->rx_length_th = 0;
+	wwan_remove_port(port->wwan_port);
+	port->wwan_port = NULL;
+	spin_unlock_irqrestore(&port->rx_wq.lock, flags);
+}
+
+static int t7xx_port_wwan_recv_skb(struct t7xx_port *port, struct sk_buff *skb)
+{
+	struct t7xx_port_static *port_static = port->port_static;
+
+	if (!atomic_read(&port->usage_cnt)) {
+		dev_kfree_skb_any(skb);
+		dev_err_ratelimited(port->dev, "Port %s is not opened, drop packets\n",
+				    port_static->name);
+		return 0;
+	}
+
+	return t7xx_port_recv_skb(port, skb);
+}
+
+static int t7xx_port_wwan_enable_chl(struct t7xx_port *port)
+{
+	spin_lock(&port->port_update_lock);
+	port->chan_enable = true;
+	port->flags &= ~PORT_F_RX_ALLOW_DROP;
+	spin_unlock(&port->port_update_lock);
+
+	return 0;
+}
+
+static int t7xx_port_wwan_disable_chl(struct t7xx_port *port)
+{
+	spin_lock(&port->port_update_lock);
+	port->chan_enable = false;
+	port->flags |= PORT_F_RX_ALLOW_DROP;
+	spin_unlock(&port->port_update_lock);
+
+	return 0;
+}
+
+static void t7xx_port_wwan_md_state_notify(struct t7xx_port *port, unsigned int state)
+{
+	struct t7xx_port_static *port_static = port->port_static;
+
+	if (state != MD_STATE_READY)
+		return;
+
+	if (!port->wwan_port) {
+		port->wwan_port = wwan_create_port(port->dev, port_static->port_type,
+						   &wwan_ops, port);
+		if (IS_ERR(port->wwan_port))
+			dev_err(port->dev, "Unable to create WWWAN port %s", port_static->name);
+	}
+}
+
+struct port_ops wwan_sub_port_ops = {
+	.init = t7xx_port_wwan_init,
+	.recv_skb = t7xx_port_wwan_recv_skb,
+	.uninit = t7xx_port_wwan_uninit,
+	.enable_chl = t7xx_port_wwan_enable_chl,
+	.disable_chl = t7xx_port_wwan_disable_chl,
+	.md_state_notify = t7xx_port_wwan_md_state_notify,
+};