/**************************************************************************** * drivers/net/skeleton.c * * Copyright (C) 2010 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #if defined(CONFIG_NET) && defined(CONFIG_NET_skeleton) #include #include #include #include #include #include #include #include #include #include #include #include /**************************************************************************** * Definitions ****************************************************************************/ /* CONFIG_skeleton_NINTERFACES determines the number of physical interfaces * that will be supported. */ #ifndef CONFIG_skeleton_NINTERFACES # define CONFIG_skeleton_NINTERFACES 1 #endif /* TX poll deley = 1 seconds. CLK_TCK is the number of clock ticks per second */ #define skeleton_WDDELAY (1*CLK_TCK) #define skeleton_POLLHSEC (1*2) /* TX timeout = 1 minute */ #define skeleton_TXTIMEOUT (60*CLK_TCK) /* This is a helper pointer for accessing the contents of the Ethernet header */ #define BUF ((struct uip_eth_hdr *)skel->sk_dev.d_buf) /**************************************************************************** * Private Types ****************************************************************************/ /* The skel_driver_s encapsulates all state information for a single hardware * interface */ struct skel_driver_s { bool sk_bifup; /* true:ifup false:ifdown */ WDOG_ID sk_txpoll; /* TX poll timer */ WDOG_ID sk_txtimeout; /* TX timeout timer */ /* This holds the information visible to uIP/NuttX */ struct uip_driver_s sk_dev; /* Interface understood by uIP */ }; /**************************************************************************** * Private Data ****************************************************************************/ static struct skel_driver_s g_skel[CONFIG_skeleton_NINTERFACES]; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* Common TX logic */ static int skel_transmit(FAR struct skel_driver_s *skel); static int skel_uiptxpoll(struct uip_driver_s *dev); /* Interrupt handling */ static void skel_receive(FAR struct skel_driver_s *skel); static void skel_txdone(FAR struct skel_driver_s *skel); static int skel_interrupt(int irq, FAR void *context); /* Watchdog timer expirations */ static void skel_polltimer(int argc, uint32_t arg, ...); static void skel_txtimeout(int argc, uint32_t arg, ...); /* NuttX callback functions */ static int skel_ifup(struct uip_driver_s *dev); static int skel_ifdown(struct uip_driver_s *dev); static int skel_txavail(struct uip_driver_s *dev); /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Function: skel_transmit * * Description: * Start hardware transmission. Called either from the txdone interrupt * handling or from watchdog based polling. * * Parameters: * skel - Reference to the driver state structure * * Returned Value: * OK on success; a negated errno on failure * * Assumptions: * ****************************************************************************/ static int skel_transmit(FAR struct skel_driver_s *skel) { /* Verify that the hardware is ready to send another packet. If we get * here, then we are committed to sending a packet; Higher level logic * must have assured that there is not transmission in progress. */ /* Increment statistics */ /* Disable Ethernet interrupts */ /* Send the packet: address=skel->sk_dev.d_buf, length=skel->sk_dev.d_len */ /* Restore Ethernet interrupts */ /* Setup the TX timeout watchdog (perhaps restarting the timer) */ (void)wd_start(skel->sk_txtimeout, skeleton_TXTIMEOUT, skel_txtimeout, 1, (uint32_t)skel); return OK; } /**************************************************************************** * Function: skel_uiptxpoll * * Description: * The transmitter is available, check if uIP has any outgoing packets ready * to send. This is a callback from uip_poll(). uip_poll() may be called: * * 1. When the preceding TX packet send is complete, * 2. When the preceding TX packet send timesout and the interface is reset * 3. During normal TX polling * * Parameters: * dev - Reference to the NuttX driver state structure * * Returned Value: * OK on success; a negated errno on failure * * Assumptions: * ****************************************************************************/ static int skel_uiptxpoll(struct uip_driver_s *dev) { FAR struct skel_driver_s *skel = (FAR struct skel_driver_s *)dev->d_private; /* If the polling resulted in data that should be sent out on the network, * the field d_len is set to a value > 0. */ if (skel->sk_dev.d_len > 0) { uip_arp_out(&skel->sk_dev); skel_transmit(skel); /* Check if there is room in the device to hold another packet. If not, * return a non-zero value to terminate the poll. */ } /* If zero is returned, the polling will continue until all connections have * been examined. */ return 0; } /**************************************************************************** * Function: skel_receive * * Description: * An interrupt was received indicating the availability of a new RX packet * * Parameters: * skel - Reference to the driver state structure * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static void skel_receive(FAR struct skel_driver_s *skel) { do { /* Check for errors and update statistics */ /* Check if the packet is a valid size for the uIP buffer configuration */ /* Copy the data data from the hardware to skel->sk_dev.d_buf. Set * amount of data in skel->sk_dev.d_len */ /* We only accept IP packets of the configured type and ARP packets */ #ifdef CONFIG_NET_IPv6 if (BUF->type == HTONS(UIP_ETHTYPE_IP6)) #else if (BUF->type == HTONS(UIP_ETHTYPE_IP)) #endif { uip_arp_ipin(); uip_input(&skel->sk_dev); /* If the above function invocation resulted in data that should be * sent out on the network, the field d_len will set to a value > 0. */ if (skel->sk_dev.d_len > 0) { uip_arp_out(&skel->sk_dev); skel_transmit(skel); } } else if (BUF->type == htons(UIP_ETHTYPE_ARP)) { uip_arp_arpin(&skel->sk_dev); /* If the above function invocation resulted in data that should be * sent out on the network, the field d_len will set to a value > 0. */ if (skel->sk_dev.d_len > 0) { skel_transmit(skel); } } } while (); /* While there are more packets to be processed */ } /**************************************************************************** * Function: skel_txdone * * Description: * An interrupt was received indicating that the last TX packet(s) is done * * Parameters: * skel - Reference to the driver state structure * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static void skel_txdone(FAR struct skel_driver_s *skel) { /* Check for errors and update statistics */ /* If no further xmits are pending, then cancel the TX timeout */ wd_cancel(skel->sk_txtimeout); /* Then poll uIP for new XMIT data */ (void)uip_poll(&skel->sk_dev, skel_uiptxpoll); } /**************************************************************************** * Function: skel_interrupt * * Description: * Hardware interrupt handler * * Parameters: * irq - Number of the IRQ that generated the interrupt * context - Interrupt register state save info (architecture-specific) * * Returned Value: * OK on success * * Assumptions: * ****************************************************************************/ static int skel_interrupt(int irq, FAR void *context) { register FAR struct skel_driver_s *skel = &g_skel[0]; /* Disable Ethernet interrupts */ /* Get and clear interrupt status bits */ /* Handle interrupts according to status bit settings */ /* Check if we received an incoming packet, if so, call skel_receive() */ skel_receive(skel); /* Check is a packet transmission just completed. If so, call skel_txdone */ skel_txdone(skel); /* Enable Ethernet interrupts (perhaps excluding the TX done interrupt if * there are no pending transmissions. */ return OK; } /**************************************************************************** * Function: skel_txtimeout * * Description: * Our TX watchdog timed out. Called from the timer interrupt handler. * The last TX never completed. Reset the hardware and start again. * * Parameters: * argc - The number of available arguments * arg - The first argument * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static void skel_txtimeout(int argc, uint32_t arg, ...) { FAR struct skel_driver_s *skel = (FAR struct skel_driver_s *)arg; /* Increment statistics and dump debug info */ /* Then reset the hardware */ /* Then poll uIP for new XMIT data */ (void)uip_poll(&skel->sk_dev, skel_uiptxpoll); } /**************************************************************************** * Function: skel_polltimer * * Description: * Periodic timer handler. Called from the timer interrupt handler. * * Parameters: * argc - The number of available arguments * arg - The first argument * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static void skel_polltimer(int argc, uint32_t arg, ...) { FAR struct skel_driver_s *skel = (FAR struct skel_driver_s *)arg; /* Check if there is room in the send another TX packet. We cannot perform * the TX poll if he are unable to accept another packet for transmission. */ /* If so, update TCP timing states and poll uIP for new XMIT data. Hmmm.. * might be bug here. Does this mean if there is a transmit in progress, * we will missing TCP time state updates? */ (void)uip_timer(&skel->sk_dev, skel_uiptxpoll, skeleton_POLLHSEC); /* Setup the watchdog poll timer again */ (void)wd_start(skel->sk_txpoll, skeleton_WDDELAY, skel_polltimer, 1, arg); } /**************************************************************************** * Function: skel_ifup * * Description: * NuttX Callback: Bring up the Ethernet interface when an IP address is * provided * * Parameters: * dev - Reference to the NuttX driver state structure * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static int skel_ifup(struct uip_driver_s *dev) { FAR struct skel_driver_s *skel = (FAR struct skel_driver_s *)dev->d_private; ndbg("Bringing up: %d.%d.%d.%d\n", dev->d_ipaddr & 0xff, (dev->d_ipaddr >> 8) & 0xff, (dev->d_ipaddr >> 16) & 0xff, dev->d_ipaddr >> 24 ); /* Initilize Ethernet interface */ /* Set and activate a timer process */ (void)wd_start(skel->sk_txpoll, skeleton_WDDELAY, skel_polltimer, 1, (uint32_t)skel); /* Enable the Ethernet interrupt */ skel->sk_bifup = true; up_enable_irq(CONFIG_skeleton_IRQ); return OK; } /**************************************************************************** * Function: skel_ifdown * * Description: * NuttX Callback: Stop the interface. * * Parameters: * dev - Reference to the NuttX driver state structure * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static int skel_ifdown(struct uip_driver_s *dev) { FAR struct skel_driver_s *skel = (FAR struct skel_driver_s *)dev->d_private; irqstate_t flags; /* Disable the Ethernet interrupt */ flags = irqsave(); up_disable_irq(CONFIG_skeleton_IRQ); /* Cancel the TX poll timer and TX timeout timers */ wd_cancel(skel->sk_txpoll); wd_cancel(skel->sk_txtimeout); /* Reset the device */ skel->sk_bifup = false; irqrestore(flags); return OK; } /**************************************************************************** * Function: skel_txavail * * Description: * Driver callback invoked when new TX data is available. This is a * stimulus perform an out-of-cycle poll and, thereby, reduce the TX * latency. * * Parameters: * dev - Reference to the NuttX driver state structure * * Returned Value: * None * * Assumptions: * Called in normal user mode * ****************************************************************************/ static int skel_txavail(struct uip_driver_s *dev) { FAR struct skel_driver_s *skel = (FAR struct skel_driver_s *)dev->d_private; irqstate_t flags; flags = irqsave(); /* Ignore the notification if the interface is not yet up */ if (skel->sk_bifup) { /* Check if there is room in the hardware to hold another outgoing packet. */ /* If so, then poll uIP for new XMIT data */ (void)uip_poll(&skel->sk_dev, skel_uiptxpoll); } irqrestore(flags); return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Function: skel_initialize * * Description: * Initialize the Ethernet driver * * Parameters: * None * * Returned Value: * OK on success; Negated errno on failure. * * Assumptions: * ****************************************************************************/ /* Initialize the Ethernet controller and driver */ int skel_initialize(void) { /* Check if a Ethernet chip is recognized at its I/O base */ /* Attach the IRQ to the driver */ if (irq_attach(CONFIG_skeleton_IRQ, skel_interrupt)) { /* We could not attach the ISR to the the interrupt */ return -EAGAIN; } /* Initialize the driver structure */ memset(g_skel, 0, CONFIG_skeleton_NINTERFACES*sizeof(struct skel_driver_s)); g_skel[0].sk_dev.d_ifup = skel_ifup; /* I/F down callback */ g_skel[0].sk_dev.d_ifdown = skel_ifdown; /* I/F up (new IP address) callback */ g_skel[0].sk_dev.d_txavail = skel_txavail; /* New TX data callback */ g_skel[0].sk_dev.d_private = (void*)g_skel; /* Used to recover private state from dev */ /* Create a watchdog for timing polling for and timing of transmisstions */ g_skel[0].sk_txpoll = wd_create(); /* Create periodic poll timer */ g_skel[0].sk_txtimeout = wd_create(); /* Create TX timeout timer */ /* Read the MAC address from the hardware into g_skel[0].sk_dev.d_mac.ether_addr_octet */ /* Register the device with the OS so that socket IOCTLs can be performed */ (void)netdev_register(&g_skel[0].sk_dev); return OK; } #endif /* CONFIG_NET && CONFIG_NET_skeleton */