1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.
4  * Copyright (C) 2018-2020 Linaro Ltd.
12 #include <linux/remoteproc/qcom_rproc.h>
34 /** struct ipa_priv - IPA network device private data */
39 /** ipa_open() - Opens the modem network interface */
43 	struct ipa *ipa = priv->ipa;  in ipa_open()
46 	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);  in ipa_open()
49 	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);  in ipa_open()
58 	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);  in ipa_open()
63 /** ipa_stop() - Stops the modem network interface. */
67 	struct ipa *ipa = priv->ipa;  in ipa_stop()
71 	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);  in ipa_stop()
72 	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);  in ipa_stop()
77 /** ipa_start_xmit() - Transmits an skb.
87 	struct net_device_stats *stats = &netdev->stats;  in ipa_start_xmit()
90 	struct ipa *ipa = priv->ipa;  in ipa_start_xmit()
91 	u32 skb_len = skb->len;  in ipa_start_xmit()
97 	endpoint = ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX];  in ipa_start_xmit()
98 	if (endpoint->data->qmap && skb->protocol != htons(ETH_P_MAP))  in ipa_start_xmit()
103 		if (ret != -E2BIG)  in ipa_start_xmit()
108 	stats->tx_packets++;  in ipa_start_xmit()
109 	stats->tx_bytes += skb_len;  in ipa_start_xmit()
115 	stats->tx_dropped++;  in ipa_start_xmit()
122 	struct net_device_stats *stats = &netdev->stats;  in ipa_modem_skb_rx()
125 		skb->dev = netdev;  in ipa_modem_skb_rx()
126 		skb->protocol = htons(ETH_P_MAP);  in ipa_modem_skb_rx()
127 		stats->rx_packets++;  in ipa_modem_skb_rx()
128 		stats->rx_bytes += skb->len;  in ipa_modem_skb_rx()
132 		stats->rx_dropped++;  in ipa_modem_skb_rx()
142 /** ipa_modem_netdev_setup() - netdev setup function for the modem */
145 	netdev->netdev_ops = &ipa_modem_ops;  in ipa_modem_netdev_setup()
148 	netdev->header_ops = NULL;  in ipa_modem_netdev_setup()
149 	netdev->type = ARPHRD_RAWIP;  in ipa_modem_netdev_setup()
150 	netdev->hard_header_len = 0;  in ipa_modem_netdev_setup()
151 	netdev->max_mtu = IPA_MTU;  in ipa_modem_netdev_setup()
152 	netdev->mtu = netdev->max_mtu;  in ipa_modem_netdev_setup()
153 	netdev->addr_len = 0;  in ipa_modem_netdev_setup()
154 	netdev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);  in ipa_modem_netdev_setup()
156 	netdev->needed_headroom = sizeof(struct rmnet_map_header);  in ipa_modem_netdev_setup()
157 	netdev->needed_tailroom = IPA_NETDEV_TAILROOM;  in ipa_modem_netdev_setup()
158 	netdev->watchdog_timeo = IPA_NETDEV_TIMEOUT * HZ;  in ipa_modem_netdev_setup()
159 	netdev->hw_features = NETIF_F_SG;  in ipa_modem_netdev_setup()
162 /** ipa_modem_suspend() - suspend callback
165  * Suspend the modem's endpoints.
170 	struct ipa *ipa = priv->ipa;  in ipa_modem_suspend()
174 	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);  in ipa_modem_suspend()
175 	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);  in ipa_modem_suspend()
178 /** ipa_modem_resume() - resume callback for runtime_pm
181  * Resume the modem's endpoints.
186 	struct ipa *ipa = priv->ipa;  in ipa_modem_resume()
188 	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);  in ipa_modem_resume()
189 	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);  in ipa_modem_resume()
201 	/* Only attempt to start the modem if it's stopped */  in ipa_modem_start()
202 	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_STOPPED,  in ipa_modem_start()
212 		ret = -ENOMEM;  in ipa_modem_start()
216 	ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = netdev;  in ipa_modem_start()
217 	ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = netdev;  in ipa_modem_start()
220 	priv->ipa = ipa;  in ipa_modem_start()
226 		ipa->modem_netdev = netdev;  in ipa_modem_start()
230 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);  in ipa_modem_start()
232 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_RUNNING);  in ipa_modem_start()
240 	struct net_device *netdev = ipa->modem_netdev;  in ipa_modem_stop()
244 	/* Only attempt to stop the modem if it's running */  in ipa_modem_stop()
245 	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_RUNNING,  in ipa_modem_stop()
254 		return -EBUSY;  in ipa_modem_stop()
256 	/* Prevent the modem from triggering a call to ipa_setup() */  in ipa_modem_stop()
265 		ipa->modem_netdev = NULL;  in ipa_modem_stop()
274 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_RUNNING);  in ipa_modem_stop()
276 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);  in ipa_modem_stop()
282 /* Treat a "clean" modem stop the same as a crash */
285 	struct device *dev = &ipa->pdev->dev;  in ipa_modem_crashed()
306 		dev_err(dev, "error %d stopping modem\n", ret);  in ipa_modem_crashed()
308 	/* Now prepare for the next modem boot */  in ipa_modem_crashed()
311 		dev_err(dev, "error %d zeroing modem memory regions\n", ret);  in ipa_modem_crashed()
319 	struct device *dev = &ipa->pdev->dev;  in ipa_modem_notify()
323 		dev_info(dev, "received modem starting event\n");  in ipa_modem_notify()
328 		dev_info(dev, "received modem running event\n");  in ipa_modem_notify()
332 		dev_info(dev, "received modem %s event\n",  in ipa_modem_notify()
333 			 notify_data->crashed ? "crashed" : "stopping");  in ipa_modem_notify()
334 		if (ipa->setup_complete)  in ipa_modem_notify()
339 		dev_info(dev, "received modem offline event\n");  in ipa_modem_notify()
364 	ipa->nb.notifier_call = ipa_modem_notify;  in ipa_modem_config()
366 	notifier = qcom_register_ssr_notifier("mpss", &ipa->nb);  in ipa_modem_config()
370 	ipa->notifier = notifier;  in ipa_modem_config()
377 	struct device *dev = &ipa->pdev->dev;  in ipa_modem_deconfig()
380 	ret = qcom_unregister_ssr_notifier(ipa->notifier, &ipa->nb);  in ipa_modem_deconfig()
384 	ipa->notifier = NULL;  in ipa_modem_deconfig()
385 	memset(&ipa->nb, 0, sizeof(ipa->nb));  in ipa_modem_deconfig()