net: wwan: t7xx: Add WWAN network interface

Creates the Cross Core Modem Network Interface (CCMNI) which implements
the wwan_ops for registration with the WWAN framework, CCMNI also
implements the net_device_ops functions used by the network device.
Network device operations include open, close, start transmission, TX
timeout and change MTU.
Signed-off-by: Haijun Liu <haijun.liu@mediatek.com>
Co-developed-by: Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
Co-developed-by: Ricardo Martinez <ricardo.martinez@linux.intel.com>
Signed-off-by: Ricardo Martinez <ricardo.martinez@linux.intel.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wwan/t7xx/Makefile

@@ -17,3 +17,4 @@ mtk_t7xx-y:=	t7xx_pci.o \
 		t7xx_hif_dpmaif_tx.o \
 		t7xx_hif_dpmaif_rx.o  \
 		t7xx_dpmaif.o \
+		t7xx_netdev.o

drivers/net/wwan/t7xx/t7xx_modem_ops.c

@@ -35,6 +35,7 @@
 #include "t7xx_hif_cldma.h"
 #include "t7xx_mhccif.h"
 #include "t7xx_modem_ops.h"
+#include "t7xx_netdev.h"
 #include "t7xx_pci.h"
 #include "t7xx_pcie_mac.h"
 #include "t7xx_port.h"
@@ -670,10 +671,14 @@ int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev)
 	if (ret)
 		goto err_destroy_hswq;
 
-	ret = t7xx_cldma_init(md->md_ctrl[CLDMA_ID_MD]);
+	ret = t7xx_ccmni_init(t7xx_dev);
 	if (ret)
 		goto err_uninit_fsm;
 
+	ret = t7xx_cldma_init(md->md_ctrl[CLDMA_ID_MD]);
+	if (ret)
+		goto err_uninit_ccmni;
+
 	ret = t7xx_port_proxy_init(md);
 	if (ret)
 		goto err_uninit_md_cldma;
@@ -692,6 +697,9 @@ int t7xx_md_init(struct t7xx_pci_dev *t7xx_dev)
 err_uninit_md_cldma:
 	t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_MD]);
 
+err_uninit_ccmni:
+	t7xx_ccmni_exit(t7xx_dev);
+
 err_uninit_fsm:
 	t7xx_fsm_uninit(md);
 
@@ -713,6 +721,7 @@ void t7xx_md_exit(struct t7xx_pci_dev *t7xx_dev)
 	t7xx_fsm_append_cmd(md->fsm_ctl, FSM_CMD_PRE_STOP, FSM_CMD_FLAG_WAIT_FOR_COMPLETION);
 	t7xx_port_proxy_uninit(md->port_prox);
 	t7xx_cldma_exit(md->md_ctrl[CLDMA_ID_MD]);
+	t7xx_ccmni_exit(t7xx_dev);
 	t7xx_fsm_uninit(md);
 	destroy_workqueue(md->handshake_wq);
 }

drivers/net/wwan/t7xx/t7xx_netdev.h

+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2021, MediaTek Inc.
+ * Copyright (c) 2021-2022, Intel Corporation.
+ *
+ * Authors:
+ *  Haijun Liu <haijun.liu@mediatek.com>
+ *  Moises Veleta <moises.veleta@intel.com>
+ *
+ * Contributors:
+ *  Amir Hanania <amir.hanania@intel.com>
+ *  Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
+ *  Ricardo Martinez <ricardo.martinez@linux.intel.com>
+ */
+
+#ifndef __T7XX_NETDEV_H__
+#define __T7XX_NETDEV_H__
+
+#include <linux/bits.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+
+#include "t7xx_hif_dpmaif.h"
+#include "t7xx_pci.h"
+#include "t7xx_state_monitor.h"
+
+#define RXQ_NUM				DPMAIF_RXQ_NUM
+#define NIC_DEV_MAX			21
+#define NIC_DEV_DEFAULT			2
+
+#define CCMNI_NETDEV_WDT_TO		(1 * HZ)
+#define CCMNI_MTU_MAX			3000
+
+struct t7xx_ccmni {
+	u8				index;
+	atomic_t			usage;
+	struct net_device		*dev;
+	struct t7xx_ccmni_ctrl		*ctlb;
+};
+
+struct t7xx_ccmni_ctrl {
+	struct t7xx_pci_dev		*t7xx_dev;
+	struct dpmaif_ctrl		*hif_ctrl;
+	struct t7xx_ccmni		*ccmni_inst[NIC_DEV_MAX];
+	struct dpmaif_callbacks		callbacks;
+	unsigned int			nic_dev_num;
+	unsigned int			md_sta;
+	struct t7xx_fsm_notifier	md_status_notify;
+	bool				wwan_is_registered;
+};
+
+int t7xx_ccmni_init(struct t7xx_pci_dev *t7xx_dev);
+void t7xx_ccmni_exit(struct t7xx_pci_dev *t7xx_dev);
+
+#endif /* __T7XX_NETDEV_H__ */