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px4-firmware/nuttx/drivers/net/skeleton.c

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/****************************************************************************
* drivers/net/skeleton.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_skeleton)
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#include <string.h>
#include <debug.h>
#include <wdog.h>
#include <errno.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/net/uip/uip.h>
#include <nuttx/net/uip/uip-arp.h>
#include <nuttx/net/uip/uip-arch.h>
/****************************************************************************
* 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 delay = 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);
#ifdef CONFIG_NET_IGMP
static int skel_addmac(struct uip_driver_s *dev, FAR const uint8_t *mac);
static int skel_rmmac(struct uip_driver_s *dev, FAR const uint8_t *mac);
#endif
/****************************************************************************
* 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:
* May or may not be called from an interrupt handler. In either case,
* global interrupts are disabled, either explicitly or indirectly through
* interrupt handling logic.
*
****************************************************************************/
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 no transmission in progress.
*/
/* Increment statistics */
/* Send the packet: address=skel->sk_dev.d_buf, length=skel->sk_dev.d_len */
/* Enable Tx 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:
* May or may not be called from an interrupt handler. In either case,
* global interrupts are disabled, either explicitly or indirectly through
* interrupt handling logic.
*
****************************************************************************/
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:
* Global interrupts are disabled by interrupt handling logic.
*
****************************************************************************/
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(&skel->sk_dev);
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:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
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 and
* disable further Tx interrupts.
*/
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];
/* 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 if a packet transmission just completed. If so, call skel_txdone.
* This may disable further Tx interrupts if there are no pending
* tansmissions.
*/
skel_txdone(skel);
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:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
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:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
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 );
/* Initialize PHYs, the Ethernet interface, and setup up Ethernet interrupts */
/* 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);
/* Put the EMAC in its reset, non-operational state. This should be
* a known configuration that will guarantee the skel_ifup() always
* successfully brings the interface back up.
*/
/* Mark the device "down" */
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;
/* Disable interrupts because this function may be called from interrupt
* level processing.
*/
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;
}
/****************************************************************************
* Function: skel_addmac
*
* Description:
* NuttX Callback: Add the specified MAC address to the hardware multicast
* address filtering
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be added
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_IGMP
static int skel_addmac(struct uip_driver_s *dev, FAR const uint8_t *mac)
{
FAR struct skel_driver_s *skel = (FAR struct skel_driver_s *)dev->d_private;
/* Add the MAC address to the hardware multicast routing table */
return OK;
}
#endif
/****************************************************************************
* Function: skel_rmmac
*
* Description:
* NuttX Callback: Remove the specified MAC address from the hardware multicast
* address filtering
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be removed
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_IGMP
static int skel_rmmac(struct uip_driver_s *dev, FAR const uint8_t *mac)
{
FAR struct skel_driver_s *skel = (FAR struct skel_driver_s *)dev->d_private;
/* Add the MAC address to the hardware multicast routing table */
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: skel_initialize
*
* Description:
* Initialize the Ethernet controller and driver
*
* Parameters:
* intf - In the case where there are multiple EMACs, this value
* identifies which EMAC is to be initialized.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
int skel_initialize(int intf)
{
struct skel_driver_s *priv;
/* Get the interface structure associated with this interface number. */
DEBUGASSERT(inf < CONFIG_skeleton_NINTERFACES);
priv = &g_skel[intf];
/* 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 interrupt */
return -EAGAIN;
}
/* Initialize the driver structure */
memset(priv, 0, sizeof(struct skel_driver_s));
priv->sk_dev.d_ifup = skel_ifup; /* I/F up (new IP address) callback */
priv->sk_dev.d_ifdown = skel_ifdown; /* I/F down callback */
priv->sk_dev.d_txavail = skel_txavail; /* New TX data callback */
#ifdef CONFIG_NET_IGMP
priv->sk_dev.d_addmac = skel_addmac; /* Add multicast MAC address */
priv->sk_dev.d_rmmac = skel_rmmac; /* Remove multicast MAC address */
#endif
priv->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 */
priv->sk_txpoll = wd_create(); /* Create periodic poll timer */
priv->sk_txtimeout = wd_create(); /* Create TX timeout timer */
/* Put the interface in the down state. This usually amounts to resetting
* the device and/or calling skel_ifdown().
*/
/* Read the MAC address from the hardware into priv->sk_dev.d_mac.ether_addr_octet */
/* Register the device with the OS so that socket IOCTLs can be performed */
(void)netdev_register(&priv->sk_dev);
return OK;
}
#endif /* CONFIG_NET && CONFIG_NET_skeleton */
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