drivers/net/ipa/ipa_modem.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0

 /* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.
  * Copyright (C) 2018-2020 Linaro Ltd.
  */

 #include <linux/errno.h>
 #include <linux/if_arp.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <linux/if_rmnet.h>
 #include <linux/remoteproc/qcom_rproc.h>

 #include "ipa.h"
 #include "ipa_data.h"
 #include "ipa_endpoint.h"
 #include "ipa_table.h"
 #include "ipa_mem.h"
 #include "ipa_modem.h"
 #include "ipa_smp2p.h"
 #include "ipa_qmi.h"

 #define IPA_NETDEV_NAME		"rmnet_ipa%d"
 #define IPA_NETDEV_TAILROOM	0	/* for padding by mux layer */
 #define IPA_NETDEV_TIMEOUT	10	/* seconds */

 enum ipa_modem_state {
 	IPA_MODEM_STATE_STOPPED	= 0,
 	IPA_MODEM_STATE_STARTING,
 	IPA_MODEM_STATE_RUNNING,
 	IPA_MODEM_STATE_STOPPING,
 };

 /** struct ipa_priv - IPA network device private data */
 struct ipa_priv {
 	struct ipa *ipa;
 };

 /** ipa_open() - Opens the modem network interface */
 static int ipa_open(struct net_device *netdev)
 {
 	struct ipa_priv *priv = netdev_priv(netdev);
 	struct ipa *ipa = priv->ipa;
 	int ret;

 	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
 	if (ret)
 		return ret;
 	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
 	if (ret)
 		goto err_disable_tx;

 	netif_start_queue(netdev);

 	return 0;

 err_disable_tx:
 	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);

 	return ret;
 }

 /** ipa_stop() - Stops the modem network interface. */
 static int ipa_stop(struct net_device *netdev)
 {
 	struct ipa_priv *priv = netdev_priv(netdev);
 	struct ipa *ipa = priv->ipa;

 	netif_stop_queue(netdev);

 	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
 	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);

 	return 0;
 }

 /** ipa_start_xmit() - Transmits an skb.
  * @skb: skb to be transmitted
  * @dev: network device
  *
  * Return codes:
  * NETDEV_TX_OK: Success
  * NETDEV_TX_BUSY: Error while transmitting the skb. Try again later
  */
 static int ipa_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
 	struct net_device_stats *stats = &netdev->stats;
 	struct ipa_priv *priv = netdev_priv(netdev);
 	struct ipa_endpoint *endpoint;
 	struct ipa *ipa = priv->ipa;
 	u32 skb_len = skb->len;
 	int ret;

 	if (!skb_len)
 		goto err_drop_skb;

 	endpoint = ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX];
 	if (endpoint->data->qmap && skb->protocol != htons(ETH_P_MAP))
 		goto err_drop_skb;

 	ret = ipa_endpoint_skb_tx(endpoint, skb);
 	if (ret) {
 		if (ret != -E2BIG)
 			return NETDEV_TX_BUSY;
 		goto err_drop_skb;
 	}

 	stats->tx_packets++;
 	stats->tx_bytes += skb_len;

 	return NETDEV_TX_OK;

 err_drop_skb:
 	dev_kfree_skb_any(skb);
 	stats->tx_dropped++;

 	return NETDEV_TX_OK;
 }

 void ipa_modem_skb_rx(struct net_device *netdev, struct sk_buff *skb)
 {
 	struct net_device_stats *stats = &netdev->stats;

 	if (skb) {
 		skb->dev = netdev;
 		skb->protocol = htons(ETH_P_MAP);
 		stats->rx_packets++;
 		stats->rx_bytes += skb->len;

 		(void)netif_receive_skb(skb);
 	} else {
 		stats->rx_dropped++;
 	}
 }

 static const struct net_device_ops ipa_modem_ops = {
 	.ndo_open	= ipa_open,
 	.ndo_stop	= ipa_stop,
 	.ndo_start_xmit	= ipa_start_xmit,
 };

 /** ipa_modem_netdev_setup() - netdev setup function for the modem */
 static void ipa_modem_netdev_setup(struct net_device *netdev)
 {
 	netdev->netdev_ops = &ipa_modem_ops;
 	ether_setup(netdev);
 	/* No header ops (override value set by ether_setup()) */
 	netdev->header_ops = NULL;
 	netdev->type = ARPHRD_RAWIP;
 	netdev->hard_header_len = 0;
 	netdev->max_mtu = IPA_MTU;
 	netdev->mtu = netdev->max_mtu;
 	netdev->addr_len = 0;
 	netdev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
 	/* The endpoint is configured for QMAP */
 	netdev->needed_headroom = sizeof(struct rmnet_map_header);
 	netdev->needed_tailroom = IPA_NETDEV_TAILROOM;
 	netdev->watchdog_timeo = IPA_NETDEV_TIMEOUT * HZ;
 	netdev->hw_features = NETIF_F_SG;
 }

 /** ipa_modem_suspend() - suspend callback
  * @netdev:	Network device
  *
  * Suspend the modem's endpoints.
  */
 void ipa_modem_suspend(struct net_device *netdev)
 {
 	struct ipa_priv *priv = netdev_priv(netdev);
 	struct ipa *ipa = priv->ipa;

 	netif_stop_queue(netdev);

 	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
 	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
 }

 /** ipa_modem_resume() - resume callback for runtime_pm
  * @dev: pointer to device
  *
  * Resume the modem's endpoints.
  */
 void ipa_modem_resume(struct net_device *netdev)
 {
 	struct ipa_priv *priv = netdev_priv(netdev);
 	struct ipa *ipa = priv->ipa;

 	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
 	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);

 	netif_wake_queue(netdev);
 }

 int ipa_modem_start(struct ipa *ipa)
 {
 	enum ipa_modem_state state;
 	struct net_device *netdev;
 	struct ipa_priv *priv;
 	int ret;

 	/* Only attempt to start the modem if it's stopped */
 	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_STOPPED,
 			       IPA_MODEM_STATE_STARTING);

 	/* Silently ignore attempts when running, or when changing state */
 	if (state != IPA_MODEM_STATE_STOPPED)
 		return 0;

 	netdev = alloc_netdev(sizeof(struct ipa_priv), IPA_NETDEV_NAME,
 			      NET_NAME_UNKNOWN, ipa_modem_netdev_setup);
 	if (!netdev) {
 		ret = -ENOMEM;
 		goto out_set_state;
 	}

 	ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = netdev;
 	ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = netdev;

 	priv = netdev_priv(netdev);
 	priv->ipa = ipa;

 	ret = register_netdev(netdev);
 	if (ret)
 		free_netdev(netdev);
 	else
 		ipa->modem_netdev = netdev;

 out_set_state:
 	if (ret)
 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);
 	else
 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_RUNNING);
 	smp_mb__after_atomic();

 	return ret;
 }

 int ipa_modem_stop(struct ipa *ipa)
 {
 	struct net_device *netdev = ipa->modem_netdev;
 	enum ipa_modem_state state;
 	int ret;

 	/* Only attempt to stop the modem if it's running */
 	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_RUNNING,
 			       IPA_MODEM_STATE_STOPPING);

 	/* Silently ignore attempts when already stopped */
 	if (state == IPA_MODEM_STATE_STOPPED)
 		return 0;

 	/* If we're somewhere between stopped and starting, we're busy */
 	if (state != IPA_MODEM_STATE_RUNNING)
 		return -EBUSY;

 	/* Prevent the modem from triggering a call to ipa_setup() */
 	ipa_smp2p_disable(ipa);

 	if (netdev) {
 		/* Stop the queue and disable the endpoints if it's open */
 		ret = ipa_stop(netdev);
 		if (ret)
 			goto out_set_state;

 		ipa->modem_netdev = NULL;
 		unregister_netdev(netdev);
 		free_netdev(netdev);
 	} else {
 		ret = 0;
 	}

 out_set_state:
 	if (ret)
 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_RUNNING);
 	else
 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);
 	smp_mb__after_atomic();

 	return ret;
 }

 /* Treat a "clean" modem stop the same as a crash */
 static void ipa_modem_crashed(struct ipa *ipa)
 {
 	struct device *dev = &ipa->pdev->dev;
 	int ret;

 	ipa_endpoint_modem_pause_all(ipa, true);

 	ipa_endpoint_modem_hol_block_clear_all(ipa);

 	ipa_table_reset(ipa, true);

 	ret = ipa_table_hash_flush(ipa);
 	if (ret)
 		dev_err(dev, "error %d flushing hash caches\n", ret);

 	ret = ipa_endpoint_modem_exception_reset_all(ipa);
 	if (ret)
 		dev_err(dev, "error %d resetting exception endpoint\n", ret);

 	ipa_endpoint_modem_pause_all(ipa, false);

 	ret = ipa_modem_stop(ipa);
 	if (ret)
 		dev_err(dev, "error %d stopping modem\n", ret);

 	/* Now prepare for the next modem boot */
 	ret = ipa_mem_zero_modem(ipa);
 	if (ret)
 		dev_err(dev, "error %d zeroing modem memory regions\n", ret);
 }

 static int ipa_modem_notify(struct notifier_block *nb, unsigned long action,
 			    void *data)
 {
 	struct ipa *ipa = container_of(nb, struct ipa, nb);
 	struct qcom_ssr_notify_data *notify_data = data;
 	struct device *dev = &ipa->pdev->dev;

 	switch (action) {
 	case QCOM_SSR_BEFORE_POWERUP:
 		dev_info(dev, "received modem starting event\n");
 		ipa_smp2p_notify_reset(ipa);
 		break;

 	case QCOM_SSR_AFTER_POWERUP:
 		dev_info(dev, "received modem running event\n");
 		break;

 	case QCOM_SSR_BEFORE_SHUTDOWN:
 		dev_info(dev, "received modem %s event\n",
 			 notify_data->crashed ? "crashed" : "stopping");
 		if (ipa->setup_complete)
 			ipa_modem_crashed(ipa);
 		break;

 	case QCOM_SSR_AFTER_SHUTDOWN:
 		dev_info(dev, "received modem offline event\n");
 		break;

 	default:
 		dev_err(dev, "received unrecognized event %lu\n", action);
 		break;
 	}

 	return NOTIFY_OK;
 }

 int ipa_modem_init(struct ipa *ipa, bool modem_init)
 {
 	return ipa_smp2p_init(ipa, modem_init);
 }

 void ipa_modem_exit(struct ipa *ipa)
 {
 	ipa_smp2p_exit(ipa);
 }

 int ipa_modem_config(struct ipa *ipa)
 {
 	void *notifier;

 	ipa->nb.notifier_call = ipa_modem_notify;

 	notifier = qcom_register_ssr_notifier("mpss", &ipa->nb);
 	if (IS_ERR(notifier))
 		return PTR_ERR(notifier);

 	ipa->notifier = notifier;

 	return 0;
 }

 void ipa_modem_deconfig(struct ipa *ipa)
 {
 	struct device *dev = &ipa->pdev->dev;
 	int ret;

 	ret = qcom_unregister_ssr_notifier(ipa->notifier, &ipa->nb);
 	if (ret)
 		dev_err(dev, "error %d unregistering notifier", ret);

 	ipa->notifier = NULL;
 	memset(&ipa->nb, 0, sizeof(ipa->nb));
 }

 int ipa_modem_setup(struct ipa *ipa)
 {
 	return ipa_qmi_setup(ipa);
 }

 void ipa_modem_teardown(struct ipa *ipa)
 {
 	ipa_qmi_teardown(ipa);
 }
	// SPDX-License-Identifier: GPL-2.0

	/* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.
	* Copyright (C) 2018-2020 Linaro Ltd.
	*/

	#include <linux/errno.h>
	#include <linux/if_arp.h>
	#include <linux/netdevice.h>
	#include <linux/skbuff.h>
	#include <linux/if_rmnet.h>
	#include <linux/remoteproc/qcom_rproc.h>

	#include "ipa.h"
	#include "ipa_data.h"
	#include "ipa_endpoint.h"
	#include "ipa_table.h"
	#include "ipa_mem.h"
	#include "ipa_modem.h"
	#include "ipa_smp2p.h"
	#include "ipa_qmi.h"

	#define IPA_NETDEV_NAME "rmnet_ipa%d"
	#define IPA_NETDEV_TAILROOM 0 /* for padding by mux layer */
	#define IPA_NETDEV_TIMEOUT 10 /* seconds */

	enum ipa_modem_state {
	IPA_MODEM_STATE_STOPPED = 0,
	IPA_MODEM_STATE_STARTING,
	IPA_MODEM_STATE_RUNNING,
	IPA_MODEM_STATE_STOPPING,
	};

	/** struct ipa_priv - IPA network device private data */
	struct ipa_priv {
	struct ipa *ipa;
	};

	/** ipa_open() - Opens the modem network interface */
	static int ipa_open(struct net_device *netdev)
	{
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa *ipa = priv->ipa;
	int ret;

	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
	if (ret)
	return ret;
	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
	if (ret)
	goto err_disable_tx;

	netif_start_queue(netdev);

	return 0;

	err_disable_tx:
	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);

	return ret;
	}

	/** ipa_stop() - Stops the modem network interface. */
	static int ipa_stop(struct net_device *netdev)
	{
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa *ipa = priv->ipa;

	netif_stop_queue(netdev);

	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);

	return 0;
	}

	/** ipa_start_xmit() - Transmits an skb.
	* @skb: skb to be transmitted
	* @dev: network device
	*
	* Return codes:
	* NETDEV_TX_OK: Success
	* NETDEV_TX_BUSY: Error while transmitting the skb. Try again later
	*/
	static int ipa_start_xmit(struct sk_buff skb, struct net_device netdev)
	{
	struct net_device_stats *stats = &netdev->stats;
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa_endpoint *endpoint;
	struct ipa *ipa = priv->ipa;
	u32 skb_len = skb->len;
	int ret;

	if (!skb_len)
	goto err_drop_skb;

	endpoint = ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX];
	if (endpoint->data->qmap && skb->protocol != htons(ETH_P_MAP))
	goto err_drop_skb;

	ret = ipa_endpoint_skb_tx(endpoint, skb);
	if (ret) {
	if (ret != -E2BIG)
	return NETDEV_TX_BUSY;
	goto err_drop_skb;
	}

	stats->tx_packets++;
	stats->tx_bytes += skb_len;

	return NETDEV_TX_OK;

	err_drop_skb:
	dev_kfree_skb_any(skb);
	stats->tx_dropped++;

	return NETDEV_TX_OK;
	}

	void ipa_modem_skb_rx(struct net_device netdev, struct sk_buff skb)
	{
	struct net_device_stats *stats = &netdev->stats;

	if (skb) {
	skb->dev = netdev;
	skb->protocol = htons(ETH_P_MAP);
	stats->rx_packets++;
	stats->rx_bytes += skb->len;

	(void)netif_receive_skb(skb);
	} else {
	stats->rx_dropped++;
	}
	}

	static const struct net_device_ops ipa_modem_ops = {
	.ndo_open = ipa_open,
	.ndo_stop = ipa_stop,
	.ndo_start_xmit = ipa_start_xmit,
	};

	/** ipa_modem_netdev_setup() - netdev setup function for the modem */
	static void ipa_modem_netdev_setup(struct net_device *netdev)
	{
	netdev->netdev_ops = &ipa_modem_ops;
	ether_setup(netdev);
	/* No header ops (override value set by ether_setup()) */
	netdev->header_ops = NULL;
	netdev->type = ARPHRD_RAWIP;
	netdev->hard_header_len = 0;
	netdev->max_mtu = IPA_MTU;
	netdev->mtu = netdev->max_mtu;
	netdev->addr_len = 0;
	netdev->flags &= ~(IFF_BROADCAST \| IFF_MULTICAST);
	/* The endpoint is configured for QMAP */
	netdev->needed_headroom = sizeof(struct rmnet_map_header);
	netdev->needed_tailroom = IPA_NETDEV_TAILROOM;
	netdev->watchdog_timeo = IPA_NETDEV_TIMEOUT * HZ;
	netdev->hw_features = NETIF_F_SG;
	}

	/** ipa_modem_suspend() - suspend callback
	* @netdev: Network device
	*
	* Suspend the modem's endpoints.
	*/
	void ipa_modem_suspend(struct net_device *netdev)
	{
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa *ipa = priv->ipa;

	netif_stop_queue(netdev);

	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
	}

	/** ipa_modem_resume() - resume callback for runtime_pm
	* @dev: pointer to device
	*
	* Resume the modem's endpoints.
	*/
	void ipa_modem_resume(struct net_device *netdev)
	{
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa *ipa = priv->ipa;

	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);

	netif_wake_queue(netdev);
	}

	int ipa_modem_start(struct ipa *ipa)
	{
	enum ipa_modem_state state;
	struct net_device *netdev;
	struct ipa_priv *priv;
	int ret;

	/* Only attempt to start the modem if it's stopped */
	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_STOPPED,
	IPA_MODEM_STATE_STARTING);

	/* Silently ignore attempts when running, or when changing state */
	if (state != IPA_MODEM_STATE_STOPPED)
	return 0;

	netdev = alloc_netdev(sizeof(struct ipa_priv), IPA_NETDEV_NAME,
	NET_NAME_UNKNOWN, ipa_modem_netdev_setup);
	if (!netdev) {
	ret = -ENOMEM;
	goto out_set_state;
	}

	ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = netdev;
	ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = netdev;

	priv = netdev_priv(netdev);
	priv->ipa = ipa;

	ret = register_netdev(netdev);
	if (ret)
	free_netdev(netdev);
	else
	ipa->modem_netdev = netdev;

	out_set_state:
	if (ret)
	atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);
	else
	atomic_set(&ipa->modem_state, IPA_MODEM_STATE_RUNNING);
	smp_mb__after_atomic();

	return ret;
	}

	int ipa_modem_stop(struct ipa *ipa)
	{
	struct net_device *netdev = ipa->modem_netdev;
	enum ipa_modem_state state;
	int ret;

	/* Only attempt to stop the modem if it's running */
	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_RUNNING,
	IPA_MODEM_STATE_STOPPING);

	/* Silently ignore attempts when already stopped */
	if (state == IPA_MODEM_STATE_STOPPED)
	return 0;

	/* If we're somewhere between stopped and starting, we're busy */
	if (state != IPA_MODEM_STATE_RUNNING)
	return -EBUSY;

	/* Prevent the modem from triggering a call to ipa_setup() */
	ipa_smp2p_disable(ipa);

	if (netdev) {
	/* Stop the queue and disable the endpoints if it's open */
	ret = ipa_stop(netdev);
	if (ret)
	goto out_set_state;

	ipa->modem_netdev = NULL;
	unregister_netdev(netdev);
	free_netdev(netdev);
	} else {
	ret = 0;
	}

	out_set_state:
	if (ret)
	atomic_set(&ipa->modem_state, IPA_MODEM_STATE_RUNNING);
	else
	atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);
	smp_mb__after_atomic();

	return ret;
	}

	/* Treat a "clean" modem stop the same as a crash */
	static void ipa_modem_crashed(struct ipa *ipa)
	{
	struct device *dev = &ipa->pdev->dev;
	int ret;

	ipa_endpoint_modem_pause_all(ipa, true);

	ipa_endpoint_modem_hol_block_clear_all(ipa);

	ipa_table_reset(ipa, true);

	ret = ipa_table_hash_flush(ipa);
	if (ret)
	dev_err(dev, "error %d flushing hash caches\n", ret);

	ret = ipa_endpoint_modem_exception_reset_all(ipa);
	if (ret)
	dev_err(dev, "error %d resetting exception endpoint\n", ret);

	ipa_endpoint_modem_pause_all(ipa, false);

	ret = ipa_modem_stop(ipa);
	if (ret)
	dev_err(dev, "error %d stopping modem\n", ret);

	/* Now prepare for the next modem boot */
	ret = ipa_mem_zero_modem(ipa);
	if (ret)
	dev_err(dev, "error %d zeroing modem memory regions\n", ret);
	}

	static int ipa_modem_notify(struct notifier_block *nb, unsigned long action,
	void *data)
	{
	struct ipa *ipa = container_of(nb, struct ipa, nb);
	struct qcom_ssr_notify_data *notify_data = data;
	struct device *dev = &ipa->pdev->dev;

	switch (action) {
	case QCOM_SSR_BEFORE_POWERUP:
	dev_info(dev, "received modem starting event\n");
	ipa_smp2p_notify_reset(ipa);
	break;

	case QCOM_SSR_AFTER_POWERUP:
	dev_info(dev, "received modem running event\n");
	break;

	case QCOM_SSR_BEFORE_SHUTDOWN:
	dev_info(dev, "received modem %s event\n",
	notify_data->crashed ? "crashed" : "stopping");
	if (ipa->setup_complete)
	ipa_modem_crashed(ipa);
	break;

	case QCOM_SSR_AFTER_SHUTDOWN:
	dev_info(dev, "received modem offline event\n");
	break;

	default:
	dev_err(dev, "received unrecognized event %lu\n", action);
	break;
	}

	return NOTIFY_OK;
	}

	int ipa_modem_init(struct ipa *ipa, bool modem_init)
	{
	return ipa_smp2p_init(ipa, modem_init);
	}

	void ipa_modem_exit(struct ipa *ipa)
	{
	ipa_smp2p_exit(ipa);
	}

	int ipa_modem_config(struct ipa *ipa)
	{
	void *notifier;

	ipa->nb.notifier_call = ipa_modem_notify;

	notifier = qcom_register_ssr_notifier("mpss", &ipa->nb);
	if (IS_ERR(notifier))
	return PTR_ERR(notifier);

	ipa->notifier = notifier;

	return 0;
	}

	void ipa_modem_deconfig(struct ipa *ipa)
	{
	struct device *dev = &ipa->pdev->dev;
	int ret;

	ret = qcom_unregister_ssr_notifier(ipa->notifier, &ipa->nb);
	if (ret)
	dev_err(dev, "error %d unregistering notifier", ret);

	ipa->notifier = NULL;
	memset(&ipa->nb, 0, sizeof(ipa->nb));
	}

	int ipa_modem_setup(struct ipa *ipa)
	{
	return ipa_qmi_setup(ipa);
	}

	void ipa_modem_teardown(struct ipa *ipa)
	{
	ipa_qmi_teardown(ipa);
	}