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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-05-08 21:12:33 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-05-08 21:12:33 +0000 |
commit | 77c4a4d3e9f5a8f9c8d6c921e05dfae965512117 (patch) | |
tree | 1fbdded94bf80f8b3710c7590573fff28c250a86 /nuttx/arch/arm/src/lm3s/lm3s_ethernet.c | |
parent | 637a7d82473a76f00af93d16c38624b4960e8575 (diff) | |
download | px4-nuttx-77c4a4d3e9f5a8f9c8d6c921e05dfae965512117.tar.gz px4-nuttx-77c4a4d3e9f5a8f9c8d6c921e05dfae965512117.tar.bz2 px4-nuttx-77c4a4d3e9f5a8f9c8d6c921e05dfae965512117.zip |
lm3s6918 update
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1764 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm/src/lm3s/lm3s_ethernet.c')
-rw-r--r-- | nuttx/arch/arm/src/lm3s/lm3s_ethernet.c | 609 |
1 files changed, 609 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_ethernet.c b/nuttx/arch/arm/src/lm3s/lm3s_ethernet.c new file mode 100644 index 000000000..eccf6b83e --- /dev/null +++ b/nuttx/arch/arm/src/lm3s/lm3s_ethernet.c @@ -0,0 +1,609 @@ +/**************************************************************************** + * arch/arm/src/lm3s/lm3s_ethernet.c + * + * Copyright (C) 2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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_LM3S_ETHERNET) + +#include <time.h> +#include <string.h> +#include <debug.h> +#include <wdog.h> +#include <errno.h> + +#include <nuttx/irq.h> +#include <nuttx/arch.h> + +#include <net/uip/uip.h> +#include <net/uip/uip-arp.h> +#include <net/uip/uip-arch.h> + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/* TX poll deley = 1 seconds. CLK_TCK is the number of clock ticks per second */ + +#define LM3S_WDDELAY (1*CLK_TCK) +#define LM3S_POLLHSEC (1*2) + +/* TX timeout = 1 minute */ + +#define LM3S_TXTIMEOUT (60*CLK_TCK) + +/* This is a helper pointer for accessing the contents of the Ethernet header */ + +#define BUF ((struct uip_eth_hdr *)skel->ld_dev.d_buf) + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/* The lm3s_driver_s encapsulates all state information for a single hardware + * interface + */ + +struct lm3s_driver_s +{ + boolean ld_bifup; /* TRUE:ifup FALSE:ifdown */ + WDOG_ID ld_txpoll; /* TX poll timer */ + WDOG_ID ld_txtimeout; /* TX timeout timer */ + + /* This holds the information visible to uIP/NuttX */ + + struct uip_driver_s ld_dev; /* Interface understood by uIP */ +}; + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static struct lm3s_driver_s g_lm3sdev; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/* Common TX logic */ + +static int lm3s_transmit(struct lm3s_driver_s *skel); +static int lm3s_uiptxpoll(struct uip_driver_s *dev); + +/* Interrupt handling */ + +static void lm3s_receive(struct lm3s_driver_s *skel); +static void lm3s_txdone(struct lm3s_driver_s *skel); +static int lm3s_interrupt(int irq, FAR void *context); + +/* Watchdog timer expirations */ + +static void lm3s_polltimer(int argc, uint32 arg, ...); +static void lm3s_txtimeout(int argc, uint32 arg, ...); + +/* NuttX callback functions */ + +static int lm3s_ifup(struct uip_driver_s *dev); +static int lm3s_ifdown(struct uip_driver_s *dev); +static int lm3s_txavail(struct uip_driver_s *dev); + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Function: lm3s_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 lm3s_transmit(struct lm3s_driver_s *skel) +{ + /* Verify that the hardware is ready to send another packet */ +#warning "Missing logic" + /* Increment statistics */ + + /* Disable Ethernet interrupts */ + + /* Send the packet: address=skel->ld_dev.d_buf, length=skel->ld_dev.d_len */ + + /* Restore Ethernet interrupts */ + + /* Setup the TX timeout watchdog (perhaps restarting the timer) */ + + (void)wd_start(skel->ld_txtimeout, LM3S_TXTIMEOUT, lm3s_txtimeout, 1, (uint32)skel); + return OK; +} + +/**************************************************************************** + * Function: lm3s_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 lm3s_uiptxpoll(struct uip_driver_s *dev) +{ + struct lm3s_driver_s *skel = (struct lm3s_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->ld_dev.d_len > 0) + { + uip_arp_out(&skel->ld_dev); + lm3s_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. + */ +#warning "Missing logic" + } + + /* If zero is returned, the polling will continue until all connections have + * been examined. + */ + + return 0; +} + +/**************************************************************************** + * Function: lm3s_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 lm3s_receive(struct lm3s_driver_s *skel) +{ + do + { + /* Check for errors and update statistics */ +#warning "Missing logic" + + /* Check if the packet is a valid size for the uIP buffer configuration */ + + /* Copy the data data from the hardware to skel->ld_dev.d_buf. Set + * amount of data in skel->ld_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->ld_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->ld_dev.d_len > 0) + { + uip_arp_out(&skel->ld_dev); + lm3s_transmit(skel); + } + } + else if (BUF->type == htons(UIP_ETHTYPE_ARP)) + { + uip_arp_arpin(&skel->ld_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->ld_dev.d_len > 0) + { + lm3s_transmit(skel); + } + } + } + } + while (); /* While there are more packets to be processed */ +} + +/**************************************************************************** + * Function: lm3s_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 lm3s_txdone(struct lm3s_driver_s *skel) +{ + /* Check for errors and update statistics */ +#warning "Missing logic" + + /* If no further xmits are pending, then cancel the TX timeout */ + + wd_cancel(skel->ld_txtimeout); + + /* Then poll uIP for new XMIT data */ + + (void)uip_poll(&skel->ld_dev, lm3s_uiptxpoll); +} + +/**************************************************************************** + * Function: lm3s_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 lm3s_interrupt(int irq, FAR void *context) +{ + register struct lm3s_driver_s *skel = &g_lm3sdev; + + /* Disable Ethernet interrupts */ +#warning "Missing logic" + + /* Get and clear interrupt status bits */ + + /* Handle interrupts according to status bit settings */ + + /* Check if we received an incoming packet, if so, call lm3s_receive() */ + + lm3s_receive(skel); + + /* Check is a packet transmission just completed. If so, call lm3s_txdone */ + + lm3s_txdone(skel); + + /* Enable Ethernet interrupts (perhaps excluding the TX done interrupt if + * there are no pending transmissions. + */ + + return OK; +} + +/**************************************************************************** + * Function: lm3s_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 lm3s_txtimeout(int argc, uint32 arg, ...) +{ + struct lm3s_driver_s *skel = (struct lm3s_driver_s *)arg; + + /* Increment statistics and dump debug info */ +#warning "Missing logic" + + /* Then reset the hardware */ + + /* Then poll uIP for new XMIT data */ + + (void)uip_poll(&skel->ld_dev, lm3s_uiptxpoll); +} + +/**************************************************************************** + * Function: lm3s_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 lm3s_polltimer(int argc, uint32 arg, ...) +{ + struct lm3s_driver_s *skel = (struct lm3s_driver_s *)arg; + + /* Check if there is room in the send another Tx packet. */ +#warning "Missing logic" + + /* If so, update TCP timing states and poll uIP for new XMIT data */ + + (void)uip_timer(&skel->ld_dev, lm3s_uiptxpoll, LM3S_POLLHSEC); + + /* Setup the watchdog poll timer again */ + + (void)wd_start(skel->ld_txpoll, LM3S_WDDELAY, lm3s_polltimer, 1, arg); +} + +/**************************************************************************** + * Function: lm3s_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 lm3s_ifup(struct uip_driver_s *dev) +{ + struct lm3s_driver_s *skel = (struct lm3s_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 */ +#warning "Missing logic" + + /* Set and activate a timer process */ + + (void)wd_start(skel->ld_txpoll, LM3S_WDDELAY, lm3s_polltimer, 1, (uint32)skel); + + /* Enable the Ethernet interrupt */ + + skel->ld_bifup = TRUE; + up_enable_irq(CONFIG_LM3S_IRQ); + return OK; +} + +/**************************************************************************** + * Function: lm3s_ifdown + * + * Description: + * NuttX Callback: Stop the interface. + * + * Parameters: + * dev - Reference to the NuttX driver state structure + * + * Returned Value: + * None + * + * Assumptions: + * + ****************************************************************************/ + +static int lm3s_ifdown(struct uip_driver_s *dev) +{ + struct lm3s_driver_s *skel = (struct lm3s_driver_s *)dev->d_private; + irqstate_t flags; + + /* Disable the Ethernet interrupt */ + + flags = irqsave(); + up_disable_irq(CONFIG_LM3S_IRQ); + + /* Cancel the TX poll timer and TX timeout timers */ + + wd_cancel(skel->ld_txpoll); + wd_cancel(skel->ld_txtimeout); + + /* Reset the device */ + + skel->ld_bifup = FALSE; + irqrestore(flags); + return OK; +} + +/**************************************************************************** + * Function: lm3s_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 lm3s_txavail(struct uip_driver_s *dev) +{ + struct lm3s_driver_s *skel = (struct lm3s_driver_s *)dev->d_private; + irqstate_t flags; + + flags = irqsave(); + + /* Ignore the notification if the interface is not yet up */ + + if (skel->ld_bifup) + { + /* Check if there is room in the hardware to hold another outgoing packet. */ +#warning "Missing logic" + + /* If so, then poll uIP for new XMIT data */ + + (void)uip_poll(&skel->ld_dev, lm3s_uiptxpoll); + } + + irqrestore(flags); + return OK; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Function: lm3s_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 lm3s_initialize(void) +{ + /* Check if the Ethernet module is present */ + + DEBUGASSERT((getreg32(LM3S_SYSCON_DC4) & (SYSCON_DC4_EMAC0|SYSCON_DC4_EPHY0)) == (SYSCON_DC4_EMAC0|SYSCON_DC4_EPHY0)); + + /* Enable Port F for Ethernet LEDs: LED0=Bit 3; LED1=Bit 2 */ + +#ifdef CONFIG_LM3S_ETHLEDS + /* Make sure that the GPIOF peripheral is enabled */ + + modifyreg32(LM3S_SYSCON_RCGC2_OFFSET, 0, SYSCON_RCGC2_GPIOF); + + /* Configure the pins for the peripheral function */ + + lm3s_configgpio(GPIO_FUNC_PERIPHERAL | GPIO_STRENGTH_2MA | GPIO_PADTYPE_STD | GPIO_PORTF | 2); + lm3s_configgpio(GPIO_FUNC_PERIPHERAL | GPIO_STRENGTH_2MA | GPIO_PADTYPE_STD | GPIO_PORTF | 3); +#endif + +#warning "Missing logic" + + /* Attach the IRQ to the driver */ + + if (irq_attach(CONFIG_LM3S_IRQ, lm3s_interrupt)) + { + /* We could not attach the ISR to the ISR */ + + return -EAGAIN; + } + + /* Initialize the driver structure */ + + memset(g_lm3sdev, 0, sizeof(struct lm3s_driver_s)); + g_lm3sdev.ld_dev.d_ifup = lm3s_ifup; /* I/F down callback */ + g_lm3sdev.ld_dev.d_ifdown = lm3s_ifdown; /* I/F up (new IP address) callback */ + g_lm3sdev.ld_dev.d_txavail = lm3s_txavail; /* New TX data callback */ + g_lm3sdev.ld_dev.d_private = (void*)g_lm3sdev; /* Used to recover private state from dev */ + + /* Create a watchdog for timing polling for and timing of transmisstions */ + + g_lm3sdev.ld_txpoll = wd_create(); /* Create periodic poll timer */ + g_lm3sdev.ld_txtimeout = wd_create(); /* Create TX timeout timer */ + + /* Read the MAC address from the hardware into g_lm3sdev.ld_dev.d_mac.ether_addr_octet */ + + /* Register the device with the OS so that socket IOCTLs can be performed */ + + (void)netdev_register(&g_lm3sdev.ld_dev); + return OK; +} + +#endif /* CONFIG_NET && CONFIG_LM3S_ETHERNET */ + |