/****************************************************************************
* 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>
#include "up_arch.h"
#include "chip.h"
#include "lm3s_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
#ifdef CONFIG_ARCH_CHIP_LM3S6918
# define LM3S_NINTERFACES 1
#else
# error "No Ethernet support for this LM3S chip"
#endif
/* 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 *)priv->ld_dev.d_buf)
/****************************************************************************
* Private Types
****************************************************************************/
/* The lm3s_driver_s encapsulates all state information for a single hardware
* interface
*/
struct lm3s_driver_s
{
/* The following fields would only be necessary on chips that support
* multiple Ethernet controllers.
*/
#if LM3S_NINTERFACES > 1
uint32 ld_base; /* Ethernet controller base address */
int ld-irq; /* Ethernet controller IRQ */
#endif
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[LM3S_NINTERFACES];
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Miscellaneous low level helpers */
#if LM3S_NINTERFACES > 1
static uint32 lm3s_ethin(struct lm3s_driver_s *priv, int offset);
static void lm3s_ethout(struct lm3s_driver_s *priv, int offset, uint32 value);
#else
static inline uint32 lm3s_ethin(struct lm3s_driver_s *priv, int offset);
static inline void lm3s_ethout(struct lm3s_driver_s *priv, int offset, uint32 value);
#endif
static void lm3s_ethreset(struct lm3s_driver_s *priv);
static void lm3s_phywrite(struct lm3s_driver_s *priv, int regaddr, uint16 value);
static uint16 lm3s_phyread(struct lm3s_driver_s *priv, int regaddr);
/* Common TX logic */
static int lm3s_transmit(struct lm3s_driver_s *priv);
static int lm3s_uiptxpoll(struct uip_driver_s *dev);
/* Interrupt handling */
static void lm3s_receive(struct lm3s_driver_s *priv);
static void lm3s_txdone(struct lm3s_driver_s *priv);
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_ethin
*
* Description:
* Read a register from the Ethernet module
*
* Parameters:
* priv - Reference to the driver state structure
* offset - Byte offset of the register from the ethernet base address
*
* Returned Value:
* Register value
*
****************************************************************************/
#if LM3S_NINTERFACES > 1
static uint32 lm3s_ethin(struct lm3s_driver_s *priv, int offset)
{
return getreg32(priv->ld_base + offset);
}
#else
static inline uint32 lm3s_ethin(struct lm3s_driver_s *priv, int offset)
{
return getreg32(LM3S_ETHCON_BASE + offset);
}
#endif
/****************************************************************************
* Function: lm3s_ethout
*
* Description:
* Write a register to the Ethernet module
*
* Parameters:
* priv - Reference to the driver state structure
* offset - Byte offset of the register from the ethernet base address
* value - The value to write the the Ethernet register
*
* Returned Value:
* None
*
****************************************************************************/
#if LM3S_NINTERFACES > 1
static void lm3s_ethout(struct lm3s_driver_s *priv, int offset, uint32 value)
{
putreg32(value, priv->ld_base + offset);
}
#else
static inline void lm3s_ethout(struct lm3s_driver_s *priv, int offset, uint32 value)
{
putreg32(value, LM3S_ETHCON_BASE + offset);
}
#endif
/****************************************************************************
* Function: lm3s_ethreset
*
* Description:
* Configure and reset the Ethernet module, leaving it in a disabled state.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
*
****************************************************************************/
static void lm3s_ethreset(struct lm3s_driver_s *priv)
{
irqstate_t flags;
uint32 regval;
volatile uint32 delay;
uint32 div;
#if LM3S_NINTERFACES > 1
# error "If multiple interfaces are supported, this function would have to be redesigned"
#endif
/* Make sure that clocking is enabled for the Ethernet (and PHY) peripherals */
flags = irqsave();
regval = getreg32(LM3S_SYSCON_RCGC2);
regval |= (SYSCON_RCGC2_EMAC0|SYSCON_RCGC2_EPHY0);
putreg32(regval, LM3S_SYSCON_RCGC2);
nvdbg("RCGC2: %08x\n", regval);
/* Put the Ethernet controller into the reset state */
regval = getreg32(LM3S_SYSCON_SRCR2);
regval |= (SYSCON_SRCR2_EMAC0|SYSCON_SRCR2_EPHY0);
putreg32(regval, LM3S_SYSCON_SRCR2);
/* Wait just a bit */
for (delay = 0; delay < 16; delay++);
/* Then take the Ethernet controller out of the reset state */
regval &= ~(SYSCON_SRCR2_EMAC0|SYSCON_SRCR2_EPHY0);
putreg32(regval, LM3S_SYSCON_SRCR2);
nvdbg("SRCR2: %08x\n", regval);
/* Enable Port F for Ethernet LEDs: LED0=Bit 3; LED1=Bit 2 */
#ifdef CONFIG_LM3S_ETHLEDS
/* Configure the pins for the peripheral function */
lm3s_configgpio(GPIO_ETHPHY_LED0 | GPIO_STRENGTH_2MA | GPIO_PADTYPE_STD);
lm3s_configgpio(GPIO_ETHPHY_LED1 | GPIO_STRENGTH_2MA | GPIO_PADTYPE_STD);
#endif
/* Disable all Ethernet controller interrupts */
regval = lm3s_ethin(priv, LM3S_MAC_IM_OFFSET);
regval &= ~MAC_IM_ALLINTS;
lm3s_ethout(priv, LM3S_MAC_IM_OFFSET, regval);
/* Clear any pending interrupts (shouldn't be any) */
regval = lm3s_ethin(priv, LM3S_MAC_RIS_OFFSET);
lm3s_ethout(priv, LM3S_MAC_IACK_OFFSET, regval);
/* Set the management clock divider register for access to the PHY
* register set. The MDC clock is divided down from the system clock per:
*
* MCLK_FREQUENCY = SYSCLK_FREQUENCY / (2 * (div + 1))
* div = (SYSCLK_FREQUENCY / 2 / MCLK_FREQUENCY) - 1
*
* Where MCLK_FREQUENCY is 2,500,000. We will add 1 to assure the max
* MCLK_FREQUENCY is not exceeded.
*/
div = SYSCLK_FREQUENCY / 2 / 2500000;
lm3s_ethout(priv, LM3S_MAC_MDV_OFFSET, div);
nvdbg("MDV: %08x\n", div);
irqrestore(flags);
}
/****************************************************************************
* Function: lm3s_phywrite
*
* Description:
* Write a 16-bit word to a PHY register
*
* Parameters:
* priv - Reference to the driver state structure
* regaddr - Address of the PHY register to write
* value - The value to write to the register
*
* Returned Value:
* None
*
****************************************************************************/
static void lm3s_phywrite(struct lm3s_driver_s *priv, int regaddr, uint16 value)
{
# warning "Missing Logic"
}
/****************************************************************************
* Function: lm3s_phywrite
*
* Description:
* Write a 16-bit word to a PHY register
*
* Parameters:
* priv - Reference to the driver state structure
* regaddr - Address of the PHY register to write
* value - The value to write to the register
*
* Returned Value:
* None
*
****************************************************************************/
static uint16 lm3s_phyread(struct lm3s_driver_s *priv, int regaddr)
{
# warning "Missing Logic"
return 0;
}
/****************************************************************************
* Function: lm3s_transmit
*
* Description:
* Start hardware transmission. Called either from the txdone interrupt
* handling or from watchdog based polling.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
****************************************************************************/
static int lm3s_transmit(struct lm3s_driver_s *priv)
{
/* Verify that the hardware is ready to send another packet */
#warning "Missing logic"
/* Increment statistics */
/* Disable Ethernet interrupts */
/* Send the packet: address=priv->ld_dev.d_buf, length=priv->ld_dev.d_len */
/* Restore Ethernet interrupts */
/* Setup the TX timeout watchdog (perhaps restarting the timer) */
(void)wd_start(priv->ld_txtimeout, LM3S_TXTIMEOUT, lm3s_txtimeout, 1, (uint32)priv);
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 *priv = (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 (priv->ld_dev.d_len > 0)
{
uip_arp_out(&priv->ld_dev);
lm3s_transmit(priv);
/* 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:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void lm3s_receive(struct lm3s_driver_s *priv)
{
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 priv->ld_dev.d_buf. Set
* amount of data in priv->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(&priv->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 (priv->ld_dev.d_len > 0)
{
uip_arp_out(&priv->ld_dev);
lm3s_transmit(priv);
}
}
else if (BUF->type == htons(UIP_ETHTYPE_ARP))
{
uip_arp_arpin(&priv->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 (priv->ld_dev.d_len > 0)
{
lm3s_transmit(priv);
}
}
}
while ( /* FIX ME */ TRUE /* FIX ME */); /* 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:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void lm3s_txdone(struct lm3s_driver_s *priv)
{
/* Check for errors and update statistics */
#warning "Missing logic"
/* If no further xmits are pending, then cancel the TX timeout */
wd_cancel(priv->ld_txtimeout);
/* Then poll uIP for new XMIT data */
(void)uip_poll(&priv->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 *priv;
#if LM3S_NINTERFACES > 1
# error "A mechanism to associate and interface with an IRQ is needed"
#else
priv = &g_lm3sdev[0];
#endif
/* 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(priv);
/* Check is a packet transmission just completed. If so, call lm3s_txdone */
lm3s_txdone(priv);
/* 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 *priv = (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(&priv->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 *priv = (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(&priv->ld_dev, lm3s_uiptxpoll, LM3S_POLLHSEC);
/* Setup the watchdog poll timer again */
(void)wd_start(priv->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 *priv = (struct lm3s_driver_s *)dev->d_private;
irqstate_t flags;
uint32 regval;
uint16 phyreg;
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 );
/* Enable and reset the Ethernet controller */
flags = irqsave();
lm3s_ethreset(priv);
/* Then configure the Ethernet Controller for normal operation
*
* Setup the transmit control register (Full duplex, TX CRC Auto Generation,
* TX Padding Enabled).
*/
# warning "These should be configurable items"
regval = lm3s_ethin(priv, LM3S_MAC_TCTL_OFFSET);
regval |= (MAC_TCTL_DUPLEX|MAC_TCTL_CRC|MAC_TCTL_PADEN);
lm3s_ethout(priv, LM3S_MAC_TCTL_OFFSET, regval);
nvdbg("TCTL: %08x\n", regval);
/* Setup the receive control register (Disable multicast frames, disable
* promiscuous mode, disable bad CRC rejection). >>> These should be configurable items <<<
*/
# warning "These should be configurable items"
regval = lm3s_ethin(priv, LM3S_MAC_RCTL_OFFSET);
regval &= ~(MAC_RCTL_BADCRC | MAC_RCTL_PRMS | MAC_RCTL_AMUL);
lm3s_ethout(priv, LM3S_MAC_RCTL_OFFSET, regval);
nvdbg("RCTL: %08x\n", regval);
/* Setup the time stamp configuration register */
#ifndef CONFIG_ARCH_CHIP_LM3S6918
regval = lm3s_ethin(priv, LM3S_MAC_TS_OFFSET);
#ifdef CONFIG_LM3S_TIMESTAMP
regval |= MAC_TS_EN;
#else
regval &= ~(MAC_TS_EN);
#endif
lm3s_ethout(priv, LM3S_MAC_TS_OFFSET, regval);
nvdbg("TS: %08x\n", regval);
#endif
/* Wait for the link to come up */
# warning "This should use a semaphore and an interrupt"
ndbg("Waiting for link\n");
do
{
phyreg = lm3s_phyread(priv, MII_MSR);
}
while ((phyreg & MII_MSR_LINKSTATUS) == 0);
ndbg("Link established\n");
/* Reset the receive FIFO */
regval = lm3s_ethin(priv, LM3S_MAC_RCTL_OFFSET);
regval |= MAC_RCTL_RSTFIFO;
lm3s_ethout(priv, LM3S_MAC_RCTL_OFFSET, regval);
/* Enable the Ethernet receiver */
regval = lm3s_ethin(priv, LM3S_MAC_RCTL_OFFSET);
regval |= MAC_RCTL_RXEN;
lm3s_ethout(priv, LM3S_MAC_RCTL_OFFSET, regval);
/* Enable the Ethernet transmitter */
regval = lm3s_ethin(priv, LM3S_MAC_RCTL_OFFSET);
regval |= MAC_TCTL_TXEN;
lm3s_ethout(priv, LM3S_MAC_TCTL_OFFSET, regval);
/* Reset the receive FIFO (again) */
regval = lm3s_ethin(priv, LM3S_MAC_RCTL_OFFSET);
regval |= MAC_RCTL_RSTFIFO;
lm3s_ethout(priv, LM3S_MAC_RCTL_OFFSET, regval);
/* Enable the Ethernet interrupt */
#if LM3S_NINTERFACES > 1
up_enable_irq(priv->irq);
#else
up_enable_irq(LM3S_IRQ_ETHCON);
#endif
/* Enable the Ethernet RX packet receipt interrupt */
regval = lm3s_ethin(priv, LM3S_MAC_IM_OFFSET);
regval |= MAC_IM_RXINTM;
lm3s_ethout(priv, LM3S_MAC_IM_OFFSET, regval);
/* Program the hardware with it's MAC address (for filtering) */
regval = (uint32)priv->ld_dev.d_mac.ether_addr_octet[3] << 24 |
(uint32)priv->ld_dev.d_mac.ether_addr_octet[2] << 16 |
(uint32)priv->ld_dev.d_mac.ether_addr_octet[1] << 8 |
(uint32)priv->ld_dev.d_mac.ether_addr_octet[0];
lm3s_ethout(priv, LM3S_MAC_IA0_OFFSET, regval);
regval = (uint32)priv->ld_dev.d_mac.ether_addr_octet[5] << 8 |
(uint32)priv->ld_dev.d_mac.ether_addr_octet[4];
lm3s_ethout(priv, LM3S_MAC_IA1_OFFSET, regval);
/* Set and activate a timer process */
(void)wd_start(priv->ld_txpoll, LM3S_WDDELAY, lm3s_polltimer, 1, (uint32)priv);
priv->ld_bifup = TRUE;
irqrestore(flags);
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 *priv = (struct lm3s_driver_s *)dev->d_private;
irqstate_t flags;
/* Disable the Ethernet interrupt */
flags = irqsave();
#if LM3S_NINTERFACES > 1
up_disable_irq(priv->irq);
#else
up_disable_irq(LM3S_IRQ_ETHCON);
#endif
/* Cancel the TX poll timer and TX timeout timers */
wd_cancel(priv->ld_txpoll);
wd_cancel(priv->ld_txtimeout);
/* Reset the device */
priv->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 *priv = (struct lm3s_driver_s *)dev->d_private;
irqstate_t flags;
flags = irqsave();
/* Ignore the notification if the interface is not yet up */
if (priv->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(&priv->ld_dev, lm3s_uiptxpoll);
}
irqrestore(flags);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: lm3s_initialize
*
* Description:
* Initialize the Ethernet driver for one interface
*
* Parameters:
* None
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
/* Initialize the Ethernet controller and driver */
#if LM3S_NINTERFACES > 1
int lm3s_initialize(int intf)
#else
static inline int lm3s_initialize(int intf)
#endif
{
struct lm3s_driver_s *priv = &g_lm3sdev[intf];
int ret;
/* Check if the Ethernet module is present */
#if LM3S_NINTERFACES > 1
# error "This debug check only works with one interface"
#else
DEBUGASSERT((getreg32(LM3S_SYSCON_DC4) & (SYSCON_DC4_EMAC0|SYSCON_DC4_EPHY0)) == (SYSCON_DC4_EMAC0|SYSCON_DC4_EPHY0));
#endif
DEBUGASSERT((unsigned)intf < LM3S_NINTERFACES);
/* Initialize the driver structure */
memset(priv, 0, sizeof(struct lm3s_driver_s));
priv->ld_dev.d_ifup = lm3s_ifup; /* I/F down callback */
priv->ld_dev.d_ifdown = lm3s_ifdown; /* I/F up (new IP address) callback */
priv->ld_dev.d_txavail = lm3s_txavail; /* New TX data callback */
priv->ld_dev.d_private = (void*)&g_lm3sdev[0]; /* Used to recover private state from dev */
/* Create a watchdog for timing polling for and timing of transmisstions */
#if LM3S_NINTERFACES > 1
# error "A mechanism to associate base address an IRQ with an interface is needed"
priv->ld_base = ??; /* Ethernet controller base address */
priv->ld_irq = ??; /* Ethernet controller IRQ number */
#endif
priv->ld_txpoll = wd_create(); /* Create periodic poll timer */
priv->ld_txtimeout = wd_create(); /* Create TX timeout timer */
/* If the board can provide us with a MAC address, get the address
* from the board now. The MAC will not be applied until lm3s_ifup()
* is caleld (and the MAC can be overwritten with a netdev ioctl call).
*/
#ifdef CONFIG_LM3S_BOARDMAC
lm3s_ethernetmac(&priv->ld_dev.d_mac);
#endif
/* Perform minimal, one-time initialization -- just reset the controller and
* leave it disabled. The Ethernet controller will be reset and properly
* re-initialized each time lm3s_ifup() is called.
*/
lm3s_ethreset(priv);
/* Attach the IRQ to the driver */
#if LM3S_NINTERFACES > 1
ret = irq_attach(priv->irq, lm3s_interrupt);
#else
ret = irq_attach(LM3S_IRQ_ETHCON, lm3s_interrupt);
#endif
if (ret != 0)
{
/* We could not attach the ISR to the IRQ */
return -EAGAIN;
}
/* Register the device with the OS so that socket IOCTLs can be performed */
(void)netdev_register(&priv->ld_dev);
return OK;
}
/************************************************************************************
* Name: up_netinitialize
*
* Description:
* Initialize the first network interface
*
************************************************************************************/
void up_netinitialize(void)
{
(void)lm3s_initialize(0);
}
#endif /* CONFIG_NET && CONFIG_LM3S_ETHERNET */
