EMAC: Add LWIP adaptation layer

features/net/FEATURE_IPV4/lwip-interface/emac_lwip.c

@@ -0,0 +1,111 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "platform.h"
+
+#if DEVICE_EMAC
+
+#include "emac_api.h"
+#include "emac_stack_mem.h"
+#include "lwip/tcpip.h"
+#include "lwip/tcp.h"
+#include "lwip/ip.h"
+#include "netif/etharp.h"
+#include "netif/ppp_oe.h"
+
+static err_t emac_lwip_low_level_output(struct netif *netif, struct pbuf *p)
+{
+    emac_interface_t *mac = (emac_interface_t *)netif->state;
+    bool ret = mac->ops.link_out(mac, (emac_stack_mem_t *)p);
+
+    return ret ? ERR_OK : ERR_IF;
+}
+
+static err_t emac_lwip_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
+{
+    /* Only send packets if the link is up */
+    if (netif->flags & NETIF_FLAG_UP) {
+        return etharp_output(netif, q, ipaddr);
+    }
+
+    return ERR_CONN;
+}
+
+static void emac_lwip_input(void *data, emac_stack_t *buf)
+{
+    struct eth_hdr *ethhdr;
+    struct pbuf *p = (struct pbuf *)buf;
+    struct netif *netif = (struct netif *)data;
+
+    /* pass all packets to ethernet_input, which decides what packets it supports */
+    if (netif->input(p, netif) != ERR_OK) {
+        LWIP_DEBUGF(NETIF_DEBUG, ("Emac LWIP: IP input error\n"));
+
+        pbuf_free(p);
+    }
+}
+
+static void emac_lwip_state_change(void *data, bool up)
+{
+    struct netif *netif = (struct netif *)data;
+
+    if (up) {
+        tcpip_callback_with_block((tcpip_callback_fn)netif_set_link_up, netif, 1);
+    } else {
+        tcpip_callback_with_block((tcpip_callback_fn)netif_set_link_down, netif, 1);
+    }
+}
+
+err_t emac_lwip_if_init(struct netif *netif)
+{
+    int err = ERR_OK;
+    emac_interface_t *mac = (emac_interface_t *)netif->state;
+
+    mac->ops.set_link_input_cb(mac, emac_lwip_input, netif);
+    mac->ops.set_link_state_cb(mac, emac_lwip_state_change, netif);
+
+    netif->hwaddr_len = mac->ops.get_hwaddr_size(mac);
+    mac->ops.get_hwaddr(mac, netif->hwaddr);
+
+    netif->mtu = mac->ops.get_mtu_size(mac);
+
+    /* Interface capabilities */
+    netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET | NETIF_FLAG_IGMP;
+
+    mac->ops.get_ifname(mac, netif->name, 2);
+
+    netif->output = emac_lwip_output;
+    netif->linkoutput = emac_lwip_low_level_output;
+
+    if (!mac->ops.power_up(mac)) {
+        err = ERR_IF;
+    }
+
+    return err;
+}
+
+/* That's a compatibility layer for lwip_stack.c, it's already done by emac_interface in power_up and power_down */
+void eth_arch_enable_interrupts(void)
+{
+
+}
+
+void eth_arch_disable_interrupts(void)
+{
+
+}
+
+#endif /* DEVICE_EMAC */

features/net/FEATURE_IPV4/lwip-interface/eth_arch.h

@@ -31,7 +31,12 @@ extern "C" {
 
 void eth_arch_enable_interrupts(void);
 void eth_arch_disable_interrupts(void);
+
+#if DEVICE_EMAC
+err_t emac_lwip_if_init(struct netif *netif);
+#else /* DEVICE_EMAC */
 err_t eth_arch_enetif_init(struct netif *netif);
+#endif /* DEVICE_MAC */
 
 #ifdef __cplusplus
 }

features/net/FEATURE_IPV4/lwip-interface/lwip_stack.c

@@ -157,7 +157,11 @@ int lwip_bringup(void)
         sys_arch_sem_wait(&lwip_tcpip_inited, 0);
 
         memset(&lwip_netif, 0, sizeof lwip_netif);
+#if DEVICE_EMAC
+        netif_add(&lwip_netif, 0, 0, 0, &emac_if, emac_lwip_if_init, tcpip_input);
+#else /* DEVICE_EMAC */
         netif_add(&lwip_netif, 0, 0, 0, NULL, eth_arch_enetif_init, tcpip_input);
+#endif /* DEVICE_EMAC */
         netif_set_default(&lwip_netif);
 
         netif_set_link_callback  (&lwip_netif, lwip_netif_link_irq);