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nuttx/arch/arm/src/tiva/lm3s_ethernet.c

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/****************************************************************************
* arch/arm/src/tiva/lm3s_ethernet.c
*
* Copyright (C) 2009-2010, 2014 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_TIVA_ETHERNET)
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#include <string.h>
#include <debug.h>
#include <errno.h>
#include <arpa/inet.h>
#include <nuttx/arch.h>
#include <nuttx/wdog.h>
#include <nuttx/irq.h>
#include <arch/board/board.h>
#include <nuttx/net/arp.h>
#include <nuttx/net/netdev.h>
#ifdef CONFIG_NET_PKT
# include <nuttx/net/pkt.h>
#endif
#include "chip.h"
#include "up_arch.h"
#include "tiva_gpio.h"
#include "tiva_ethernet.h"
#include "chip/tiva_pinmap.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifdef CONFIG_NET_MULTIBUFFER
# error CONFIG_NET_MULTIBUFFER should not be selected
#endif
/* Half duplex can be forced if CONFIG_TIVA_ETHHDUPLEX is defined. */
#ifdef CONFIG_TIVA_ETHHDUPLEX
# define TIVA_DUPLEX_SETBITS 0
# define TIVA_DUPLEX_CLRBITS MAC_TCTL_DUPLEX
#else
# define TIVA_DUPLEX_SETBITS MAC_TCTL_DUPLEX
# define TIVA_DUPLEX_CLRBITS 0
#endif
/* Auto CRC generation can be suppressed if CONFIG_TIVA_ETHNOAUTOCRC is definde */
#ifdef CONFIG_TIVA_ETHNOAUTOCRC
# define TIVA_CRC_SETBITS 0
# define TIVA_CRC_CLRBITS MAC_TCTL_CRC
#else
# define TIVA_CRC_SETBITS MAC_TCTL_CRC
# define TIVA_CRC_CLRBITS 0
#endif
/* Tx padding can be suppressed if CONFIG_TIVA_ETHNOPAD is defined */
#ifdef CONFIG_TIVA_ETHNOPAD
# define TIVA_PADEN_SETBITS 0
# define TIVA_PADEN_CLRBITS MAC_TCTL_PADEN
#else
# define TIVA_PADEN_SETBITS MAC_TCTL_PADEN
# define TIVA_PADEN_CLRBITS 0
#endif
#define TIVA_TCTCL_SETBITS (TIVA_DUPLEX_SETBITS|TIVA_CRC_SETBITS|TIVA_PADEN_SETBITS)
#define TIVA_TCTCL_CLRBITS (TIVA_DUPLEX_CLRBITS|TIVA_CRC_CLRBITS|TIVA_PADEN_CLRBITS)
/* Multicast frames can be enabled by defining CONFIG_TIVA_MULTICAST */
#ifdef CONFIG_TIVA_MULTICAST
# define TIVA_AMUL_SETBITS MAC_RCTL_AMUL
# define TIVA_AMUL_CLRBITS 0
#else
# define TIVA_AMUL_SETBITS 0
# define TIVA_AMUL_CLRBITS MAC_RCTL_AMUL
#endif
/* Promiscuous mode can be enabled by defining CONFIG_TIVA_PROMISCUOUS */
#ifdef CONFIG_TIVA_PROMISCUOUS
# define TIVA_PRMS_SETBITS MAC_RCTL_PRMS
# define TIVA_PRMS_CLRBITS 0
#else
# define TIVA_PRMS_SETBITS 0
# define TIVA_PRMS_CLRBITS MAC_RCTL_PRMS
#endif
/* Bad CRC rejection can be enabled by define CONFIG_TIVA_BADCRC */
#ifdef CONFIG_TIVA_BADCRC
# define TIVA_BADCRC_SETBITS MAC_RCTL_BADCRC
# define TIVA_BADCRC_CLRBITS 0
#else
# define TIVA_BADCRC_SETBITS 0
# define TIVA_BADCRC_CLRBITS MAC_RCTL_BADCRC
#endif
#define TIVA_RCTCL_SETBITS (TIVA_AMUL_SETBITS|TIVA_PRMS_SETBITS|TIVA_BADCRC_SETBITS)
#define TIVA_RCTCL_CLRBITS (TIVA_AMUL_CLRBITS|TIVA_PRMS_CLRBITS|TIVA_BADCRC_CLRBITS)
/* CONFIG_TIVA_DUMPPACKET will dump the contents of each packet to the console. */
#ifdef CONFIG_TIVA_DUMPPACKET
# define tiva_dumppacket(m,a,n) lib_dumpbuffer(m,a,n)
#else
# define tiva_dumppacket(m,a,n)
#endif
/* TX poll deley = 1 seconds. CLK_TCK is the number of clock ticks per second */
#define TIVA_WDDELAY (1*CLK_TCK)
#define TIVA_POLLHSEC (1*2)
/* TX timeout = 1 minute */
#define TIVA_TXTIMEOUT (60*CLK_TCK)
/* This is a helper pointer for accessing the contents of the Ethernet header */
#define ETHBUF ((struct eth_hdr_s *)priv->ld_dev.d_buf)
#define TIVA_MAX_MDCCLK 2500000
/****************************************************************************
* Private Types
****************************************************************************/
/* EMAC statistics (debug only) */
#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_NET)
struct tiva_statistics_s
{
uint32_t rx_int; /* Number of Rx interrupts received */
uint32_t rx_packets; /* Number of packets received (sum of the following): */
#ifdef CONFIG_NET_IPv4
uint32_t rx_ip; /* Number of Rx IPv4 packets received */
#endif
#ifdef CONFIG_NET_IPv6
uint32_t rx_ipv6; /* Number of Rx IPv6 packets received */
#endif
uint32_t rx_arp; /* Number of Rx ARP packets received */
uint32_t rx_dropped; /* Number of dropped, unsupported Rx packets */
uint32_t rx_pktsize; /* Number of dropped, too small or too big */
uint32_t rx_errors; /* Number of Rx errors (reception error) */
uint32_t rx_ovrerrors; /* Number of Rx FIFO overrun errors */
uint32_t tx_int; /* Number of Tx interrupts received */
uint32_t tx_packets; /* Number of Tx packets queued */
uint32_t tx_errors; /* Number of Tx errors (transmission error)*/
uint32_t tx_timeouts; /* Number of Tx timeout errors */
};
# define EMAC_STAT(priv,name) priv->ld_stat.name++
#else
# define EMAC_STAT(priv,name)
#endif
/* The tiva_driver_s encapsulates all state information for a single hardware
* interface
*/
struct tiva_driver_s
{
/* The following fields would only be necessary on chips that support
* multiple Ethernet controllers.
*/
#if TIVA_NETHCONTROLLERS > 1
uint32_t ld_base; /* Ethernet controller base address */
int ld_irq; /* Ethernet controller IRQ */
#endif
bool ld_bifup; /* true:ifup false:ifdown */
WDOG_ID ld_txpoll; /* TX poll timer */
WDOG_ID ld_txtimeout; /* TX timeout timer */
#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_NET)
struct tiva_statistics_s ld_stat;
#endif
/* This holds the information visible to uIP/NuttX */
struct net_driver_s ld_dev; /* Interface understood by uIP */
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct tiva_driver_s g_lm3sdev[TIVA_NETHCONTROLLERS];
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Miscellaneous low level helpers */
#if TIVA_NETHCONTROLLERS > 1
static uint32_t tiva_ethin(struct tiva_driver_s *priv, int offset);
static void tiva_ethout(struct tiva_driver_s *priv, int offset, uint32_t value);
#else
static inline uint32_t tiva_ethin(struct tiva_driver_s *priv, int offset);
static inline void tiva_ethout(struct tiva_driver_s *priv, int offset, uint32_t value);
#endif
static void tiva_ethreset(struct tiva_driver_s *priv);
#if 0 /* Not used */
static void tiva_phywrite(struct tiva_driver_s *priv, int regaddr, uint16_t value);
#endif
static uint16_t tiva_phyread(struct tiva_driver_s *priv, int regaddr);
/* Common TX logic */
static int tiva_transmit(struct tiva_driver_s *priv);
static int tiva_txpoll(struct net_driver_s *dev);
/* Interrupt handling */
static void tiva_receive(struct tiva_driver_s *priv);
static void tiva_txdone(struct tiva_driver_s *priv);
static int tiva_interrupt(int irq, FAR void *context);
/* Watchdog timer expirations */
static void tiva_polltimer(int argc, uint32_t arg, ...);
static void tiva_txtimeout(int argc, uint32_t arg, ...);
/* NuttX callback functions */
static int tiva_ifup(struct net_driver_s *dev);
static int tiva_ifdown(struct net_driver_s *dev);
static int tiva_txavail(struct net_driver_s *dev);
#ifdef CONFIG_NET_IGMP
static int tiva_addmac(struct net_driver_s *dev, FAR const uint8_t *mac);
static int tiva_rmmac(struct net_driver_s *dev, FAR const uint8_t *mac);
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: tiva_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 TIVA_NETHCONTROLLERS > 1
static uint32_t tiva_ethin(struct tiva_driver_s *priv, int offset)
{
return getreg32(priv->ld_base + offset);
}
#else
static inline uint32_t tiva_ethin(struct tiva_driver_s *priv, int offset)
{
return getreg32(TIVA_ETHCON_BASE + offset);
}
#endif
/****************************************************************************
* Function: tiva_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 Ethernet register
*
* Returned Value:
* None
*
****************************************************************************/
#if TIVA_NETHCONTROLLERS > 1
static void tiva_ethout(struct tiva_driver_s *priv, int offset, uint32_t value)
{
putreg32(value, priv->ld_base + offset);
}
#else
static inline void tiva_ethout(struct tiva_driver_s *priv, int offset, uint32_t value)
{
putreg32(value, TIVA_ETHCON_BASE + offset);
}
#endif
/****************************************************************************
* Function: tiva_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 tiva_ethreset(struct tiva_driver_s *priv)
{
irqstate_t flags;
uint32_t regval;
#if TIVA_NETHCONTROLLERS > 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(TIVA_SYSCON_RCGC2);
regval |= (SYSCON_RCGC2_EMAC0|SYSCON_RCGC2_EPHY0);
putreg32(regval, TIVA_SYSCON_RCGC2);
nllvdbg("RCGC2: %08x\n", regval);
/* Put the Ethernet controller into the reset state */
regval = getreg32(TIVA_SYSCON_SRCR2);
regval |= (SYSCON_SRCR2_EMAC0|SYSCON_SRCR2_EPHY0);
putreg32(regval, TIVA_SYSCON_SRCR2);
/* Wait just a bit. This is a much longer delay than necessary */
up_mdelay(2);
/* Then take the Ethernet controller out of the reset state */
regval &= ~(SYSCON_SRCR2_EMAC0|SYSCON_SRCR2_EPHY0);
putreg32(regval, TIVA_SYSCON_SRCR2);
nllvdbg("SRCR2: %08x\n", regval);
/* Wait just a bit, again. If we touch the ethernet too soon, we may busfault. */
up_mdelay(2);
/* Enable Port F for Ethernet LEDs: LED0=Bit 3; LED1=Bit 2 */
#ifdef CONFIG_TIVA_ETHLEDS
/* Configure the pins for the peripheral function */
tiva_configgpio(GPIO_ETHPHY_LED0 | GPIO_STRENGTH_2MA | GPIO_PADTYPE_STD);
tiva_configgpio(GPIO_ETHPHY_LED1 | GPIO_STRENGTH_2MA | GPIO_PADTYPE_STD);
#endif
/* Disable all Ethernet controller interrupts */
regval = tiva_ethin(priv, TIVA_MAC_IM_OFFSET);
regval &= ~MAC_IM_ALLINTS;
tiva_ethout(priv, TIVA_MAC_IM_OFFSET, regval);
/* Clear any pending interrupts (shouldn't be any) */
regval = tiva_ethin(priv, TIVA_MAC_RIS_OFFSET);
tiva_ethout(priv, TIVA_MAC_IACK_OFFSET, regval);
irqrestore(flags);
}
/****************************************************************************
* Function: tiva_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
*
****************************************************************************/
#if 0 /* Not used */
static void tiva_phywrite(struct tiva_driver_s *priv, int regaddr, uint16_t value)
{
/* Wait for any MII transactions in progress to complete */
while ((tiva_ethin(priv, TIVA_MAC_MCTL_OFFSET) & MAC_MCTL_START) != 0);
/* Set up the data to be written */
DEBUGASSERT(value < MAC_MTXD_MASK);
tiva_ethout(priv, TIVA_MAC_MTXD_OFFSET, value);
/* Set up the PHY register address and start the write operation */
regaddr <<= MAC_MCTL_REGADR_SHIFT;
DEBUGASSERT((regaddr & MAC_MTXD_MASK) == regaddr);
tiva_ethout(priv, TIVA_MAC_MCTL_OFFSET, regaddr | MAC_MCTL_WRITE | MAC_MCTL_START);
/* Wait for the write transaction to complete */
while ((tiva_ethin(priv, TIVA_MAC_MCTL_OFFSET) & MAC_MCTL_START) != 0);
}
#endif
/****************************************************************************
* Function: tiva_phyread
*
* 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_t tiva_phyread(struct tiva_driver_s *priv, int regaddr)
{
/* Wait for any MII transactions in progress to complete */
while ((tiva_ethin(priv, TIVA_MAC_MCTL_OFFSET) & MAC_MCTL_START) != 0);
/* Set up the PHY register address and start the read operation */
regaddr <<= MAC_MCTL_REGADR_SHIFT;
DEBUGASSERT((regaddr & MAC_MTXD_MASK) == regaddr);
tiva_ethout(priv, TIVA_MAC_MCTL_OFFSET, regaddr | MAC_MCTL_START);
/* Wait for the write transaction to complete */
while ((tiva_ethin(priv, TIVA_MAC_MCTL_OFFSET) & MAC_MCTL_START) != 0);
/* Read and return the PHY data */
return (uint16_t)(tiva_ethin(priv, TIVA_MAC_MRXD_OFFSET) & MAC_MTRD_MASK);
}
/****************************************************************************
* Function: tiva_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 tiva_transmit(struct tiva_driver_s *priv)
{
irqstate_t flags;
uint32_t regval;
uint8_t *dbuf;
int pktlen;
int bytesleft;
int ret = -EBUSY;
/* Verify that the hardware is ready to send another packet */
flags = irqsave();
if ((tiva_ethin(priv, TIVA_MAC_TR_OFFSET) & MAC_TR_NEWTX) == 0)
{
/* Increment statistics */
EMAC_STAT(priv, tx_packets);
tiva_dumppacket("Transmit packet", priv->ld_dev.d_buf, priv->ld_dev.d_len);
/* Transfer the packet into the Tx FIFO. The LS 16-bits of the first
* 32-bit word written to the Tx FIFO contains the Ethernet payload
* data length. That is the full length of the message (d_len) minus
* the size of the Ethernet header (14).
*/
pktlen = priv->ld_dev.d_len;
nllvdbg("Sending packet, pktlen: %d\n", pktlen);
DEBUGASSERT(pktlen > ETH_HDRLEN);
dbuf = priv->ld_dev.d_buf;
regval = (uint32_t)(pktlen - 14);
regval |= ((uint32_t)(*dbuf++) << 16);
regval |= ((uint32_t)(*dbuf++) << 24);
tiva_ethout(priv, TIVA_MAC_DATA_OFFSET, regval);
/* Write all of the whole, 32-bit values in the middle of the packet */
for (bytesleft = pktlen - 2; bytesleft > 3; bytesleft -= 4, dbuf += 4)
{
/* Transfer a whole word from the user buffer. Note, the user
* buffer may be un-aligned.
*/
tiva_ethout(priv, TIVA_MAC_DATA_OFFSET, *(uint32_t*)dbuf);
}
/* Write the last, partial word in the FIFO */
if (bytesleft > 0)
{
/* Write the last word */
regval = 0;
switch (bytesleft)
{
case 0:
default:
break;
case 3:
regval |= ((uint32_t)dbuf[2] << 16);
case 2:
regval |= ((uint32_t)dbuf[1] << 8);
case 1:
regval |= (uint32_t)dbuf[0];
break;
}
tiva_ethout(priv, TIVA_MAC_DATA_OFFSET, regval);
}
/* Activate the transmitter */
tiva_ethout(priv, TIVA_MAC_TR_OFFSET, MAC_TR_NEWTX);
/* Setup the TX timeout watchdog (perhaps restarting the timer) */
(void)wd_start(priv->ld_txtimeout, TIVA_TXTIMEOUT, tiva_txtimeout, 1, (uint32_t)priv);
ret = OK;
}
irqrestore(flags);
return ret;
}
/****************************************************************************
* Function: tiva_txpoll
*
* Description:
* The transmitter is available, check if uIP has any outgoing packets ready
* to send. This is a callback from devif_poll(). devif_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 tiva_txpoll(struct net_driver_s *dev)
{
struct tiva_driver_s *priv = (struct tiva_driver_s *)dev->d_private;
int ret = OK;
/* If the polling resulted in data that should be sent out on the network,
* the field d_len is set to a value > 0.
*/
nllvdbg("Poll result: d_len=%d\n", priv->ld_dev.d_len);
if (priv->ld_dev.d_len > 0)
{
DEBUGASSERT((tiva_ethin(priv, TIVA_MAC_TR_OFFSET) & MAC_TR_NEWTX) == 0)
/* Look up the destination MAC address and add it to the Ethernet
* header.
*/
#ifdef CONFIG_NET_IPv4
#ifdef CONFIG_NET_IPv6
if (IFF_IS_IPv4(priv->ld_dev.d_flags))
#endif
{
arp_out(&priv->ld_dev);
}
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
#ifdef CONFIG_NET_IPv4
else
#endif
{
neighbor_out(&priv->ld_dev);
}
#endif /* CONFIG_NET_IPv6 */
/* Send the packet. tiva_transmit() will return zero if the
* packet was successfully handled.
*/
ret = tiva_transmit(priv);
}
/* If zero is returned, the polling will continue until all connections have
* been examined.
*/
return ret;
}
/****************************************************************************
* Function: tiva_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 tiva_receive(struct tiva_driver_s *priv)
{
uint32_t regval;
uint8_t *dbuf;
int pktlen;
int bytesleft;
/* Loop while there are incoming packets to be processed */
while ((tiva_ethin(priv, TIVA_MAC_NP_OFFSET) & MAC_NP_MASK) != 0)
{
/* Update statistics */
EMAC_STAT(priv, rx_packets);
/* Copy the data data from the hardware to priv->ld_dev.d_buf. Set
* amount of data in priv->ld_dev.d_len
*/
dbuf = priv->ld_dev.d_buf;
/* The packet frame length begins in the LS 16-bits of the first
* word from the FIFO followed by the Ethernet header beginning
* in the MS 16-bits of the first word.
*
* Pick off the packet length from the first word. This packet length
* includes the len/type field (size 2) and the FCS (size 4).
*/
regval = tiva_ethin(priv, TIVA_MAC_DATA_OFFSET);
pktlen = (int)(regval & 0x0000ffff);
nllvdbg("Receiving packet, pktlen: %d\n", pktlen);
/* Check if the pktlen is valid. It should be large enough to hold
* an Ethernet header and small enough to fit entirely in the I/O
* buffer. Six is subtracted to acount for the 2-byte length/type
* and 4 byte FCS that are not copied into the uIP packet.
*/
if (pktlen > (CONFIG_NET_ETH_MTU + 6) || pktlen <= (ETH_HDRLEN + 6))
{
int wordlen;
/* We will have to drop this packet */
nlldbg("Bad packet size dropped (%d)\n", pktlen);
EMAC_STAT(priv, rx_pktsize);
/* The number of bytes and words left to read is pktlen - 4 (including,
* the final, possibly partial word) because we've already read 4 bytes.
*/
wordlen = (pktlen - 1) >> 2;
/* Read and discard the remaining words in the FIFO */
while (wordlen--)
{
(void)tiva_ethin(priv, TIVA_MAC_DATA_OFFSET);
}
/* Check for another packet */
continue;
}
/* Save the first two bytes from the first word */
*dbuf++ = (uint8_t)((regval >> 16) & 0xff);
*dbuf++ = (uint8_t)((regval >> 24) & 0xff);
/* Read all of the whole, 32-bit values in the middle of the packet.
* We've already read the length (2 bytes) plus the first two bytes
* of data.
*/
for (bytesleft = pktlen - 4; bytesleft > 7; bytesleft -= 4, dbuf += 4)
{
/* Transfer a whole word to the user buffer. Note, the user
* buffer may be un-aligned.
*/
*(uint32_t*)dbuf = tiva_ethin(priv, TIVA_MAC_DATA_OFFSET);
}
/* Handle the last, partial word in the FIFO (0-3 bytes) and discard
* the 4-byte FCS.
*/
for (; bytesleft > 0; bytesleft -= 4)
{
/* Read the last word. And transfer all but the last four
* bytes of the FCS into the user buffer.
*/
regval = tiva_ethin(priv, TIVA_MAC_DATA_OFFSET);
switch (bytesleft)
{
default:
break;
case 7:
dbuf[2] = (regval >> 16) & 0xff;
case 6:
dbuf[1] = (regval >> 8) & 0xff;
case 5:
dbuf[0] = regval & 0xff;
break;
}
}
/* Pass the packet length to uIP MINUS 2 bytes for the length and
* 4 bytes for the FCS.
*/
priv->ld_dev.d_len = pktlen - 6;
tiva_dumppacket("Received packet", priv->ld_dev.d_buf, priv->ld_dev.d_len);
#ifdef CONFIG_NET_PKT
/* When packet sockets are enabled, feed the frame into the packet tap */
pkt_input(&priv->ld_dev);
#endif
/* We only accept IP packets of the configured type and ARP packets */
#ifdef CONFIG_NET_IPv4
if (ETHBUF->type == HTONS(ETHTYPE_IP))
{
nllvdbg("IPv4 frame\n");
/* Handle ARP on input then give the IPv4 packet to the network
* layer
*/
EMAC_STAT(priv, rx_ip);
arp_ipin(&priv->ld_dev);
ipv4_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)
{
/* Update the Ethernet header with the correct MAC address */
#ifdef CONFIG_NET_IPv6
if (IFF_IS_IPv4(priv->ld_dev.d_flags))
#endif
{
arp_out(&priv->ld_dev);
}
#ifdef CONFIG_NET_IPv6
else
{
neighbor_out(&priv->ld_dev);
}
#endif
/* And send the packet */
tiva_transmit(priv);
}
}
else
#endif
#ifdef CONFIG_NET_IPv6
if (ETHBUF->type == HTONS(ETHTYPE_IP6))
{
nllvdbg("Iv6 frame\n");
/* Give the IPv6 packet to the network layer */
EMAC_STAT(priv, rx_ipv6);
arp_ipin(&priv->ld_dev);
ipv6_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->dev.d_len > 0)
{
/* Update the Ethernet header with the correct MAC address */
#ifdef CONFIG_NET_IPv4
if (IFF_IS_IPv4(priv->ld_dev.d_flags))
{
arp_out(&priv->ld_dev);
}
else
#endif
#ifdef CONFIG_NET_IPv6
{
neighbor_out(&priv->ld_dev);
}
#endif
/* And send the packet */
tiva_transmit(priv);
}
}
else
#endif
#ifdef CONFIG_NET_ARP
if (ETHBUF->type == htons(ETHTYPE_ARP))
{
nllvdbg("ARP packet received (%02x)\n", ETHBUF->type);
EMAC_STAT(priv, rx_arp);
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)
{
tiva_transmit(priv);
}
}
else
#endif
{
nlldbg("Unsupported packet type dropped (%02x)\n", htons(ETHBUF->type));
EMAC_STAT(priv, rx_dropped);
}
}
}
/****************************************************************************
* Function: tiva_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 tiva_txdone(struct tiva_driver_s *priv)
{
/* Cancel the TX timeout */
wd_cancel(priv->ld_txtimeout);
/* Verify that the Tx FIFO is not in use. The NEWTX bit initiates an
* Ethernet transmission once the packet has been placed in the TX FIFO.
* This bit is cleared once the transmission has been completed. Since
* we get here because of of TXEMP which indicates that the packet was
* transmitted and that the TX FIFO is empty, NEWTX should always be zero
* at this point.
*/
DEBUGASSERT((tiva_ethin(priv, TIVA_MAC_TR_OFFSET) & MAC_TR_NEWTX) == 0)
/* Then poll uIP for new XMIT data */
(void)devif_poll(&priv->ld_dev, tiva_txpoll);
}
/****************************************************************************
* Function: tiva_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 tiva_interrupt(int irq, FAR void *context)
{
register struct tiva_driver_s *priv;
uint32_t ris;
#if TIVA_NETHCONTROLLERS > 1
# error "A mechanism to associate and interface with an IRQ is needed"
#else
priv = &g_lm3sdev[0];
#endif
/* Read the raw interrupt status register */
ris = tiva_ethin(priv, TIVA_MAC_RIS_OFFSET);
/* Clear all pending interrupts */
tiva_ethout(priv, TIVA_MAC_IACK_OFFSET, ris);
/* Check for errors */
#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_NET)
if ((ris & MAC_RIS_TXER) != 0)
{
EMAC_STAT(priv, tx_errors); /* Number of Tx errors */
}
if ((ris & MAC_RIS_FOV) != 0)
{
EMAC_STAT(priv, rx_ovrerrors); /* Number of Rx FIFO overrun errors */
}
if ((ris & MAC_RIS_RXER) != 0)
{
EMAC_STAT(priv, rx_errors); /* Number of Rx errors */
}
#endif
/* Handle (unmasked) interrupts according to status bit settings */
ris &= tiva_ethin(priv, TIVA_MAC_IM_OFFSET);
/* Is this an Rx interrupt (meaning that a packet has been received)? */
if ((ris & MAC_RIS_RXINT) != 0)
{
/* Handle the incoming packet */
EMAC_STAT(priv, rx_int);
tiva_receive(priv);
}
/* Is this an Tx interrupt (meaning that the Tx FIFO is empty)? */
if ((ris & MAC_RIS_TXEMP) != 0)
{
/* Handle the complete of the transmission */
EMAC_STAT(priv, tx_int);
tiva_txdone(priv);
}
/* Enable Ethernet interrupts (perhaps excluding the TX done interrupt if
* there are no pending transmissions).
*/
return OK;
}
/****************************************************************************
* Function: tiva_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 tiva_txtimeout(int argc, uint32_t arg, ...)
{
struct tiva_driver_s *priv = (struct tiva_driver_s *)arg;
/* Increment statistics */
nlldbg("Tx timeout\n");
EMAC_STAT(priv, tx_timeouts);
/* Then reset the hardware */
DEBUGASSERT(priv->ld_bifup);
tiva_ifdown(&priv->ld_dev);
tiva_ifup(&priv->ld_dev);
/* Then poll uIP for new XMIT data */
(void)devif_poll(&priv->ld_dev, tiva_txpoll);
}
/****************************************************************************
* Function: tiva_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 tiva_polltimer(int argc, uint32_t arg, ...)
{
struct tiva_driver_s *priv = (struct tiva_driver_s *)arg;
/* Check if we can send another Tx packet now. The NEWTX bit initiates an
* Ethernet transmission once the packet has been placed in the TX FIFO.
* This bit is cleared once the transmission has been completed.
*
* NOTE: This can cause missing poll cycles and, hence, some timing
* inaccuracies.
*/
if ((tiva_ethin(priv, TIVA_MAC_TR_OFFSET) & MAC_TR_NEWTX) == 0)
{
/* If so, update TCP timing states and poll uIP for new XMIT data */
(void)devif_timer(&priv->ld_dev, tiva_txpoll, TIVA_POLLHSEC);
/* Setup the watchdog poll timer again */
(void)wd_start(priv->ld_txpoll, TIVA_WDDELAY, tiva_polltimer, 1, arg);
}
}
/****************************************************************************
* Function: tiva_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 tiva_ifup(struct net_driver_s *dev)
{
struct tiva_driver_s *priv = (struct tiva_driver_s *)dev->d_private;
irqstate_t flags;
uint32_t regval;
uint32_t div;
uint16_t phyreg;
nlldbg("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();
tiva_ethreset(priv);
/* Set the management clock divider register for access to the PHY
* register set. The MDC clock is divided down from the system clock per:
*
* MDCCLK_FREQUENCY = SYSCLK_FREQUENCY / (2 * (div + 1))
* div = (SYSCLK_FREQUENCY / 2 / MDCCLK_FREQUENCY) - 1
*
* Where the maximum value for MDCCLK_FREQUENCY is 2,500,000. We will
* add 1 to assure the max TIVA_MAX_MDCCLK is not exceeded.
*/
div = SYSCLK_FREQUENCY / 2 / TIVA_MAX_MDCCLK;
tiva_ethout(priv, TIVA_MAC_MDV_OFFSET, div);
nllvdbg("MDV: %08x\n", div);
/* Then configure the Ethernet Controller for normal operation
*
* Setup the transmit control register (Full duplex, TX CRC Auto Generation,
* TX Padding Enabled).
*/
regval = tiva_ethin(priv, TIVA_MAC_TCTL_OFFSET);
regval &= ~TIVA_TCTCL_CLRBITS;
regval |= TIVA_TCTCL_SETBITS;
tiva_ethout(priv, TIVA_MAC_TCTL_OFFSET, regval);
nllvdbg("TCTL: %08x\n", regval);
/* Setup the receive control register (Disable multicast frames, disable
* promiscuous mode, disable bad CRC rejection).
*/
regval = tiva_ethin(priv, TIVA_MAC_RCTL_OFFSET);
regval &= ~TIVA_RCTCL_CLRBITS;
regval |= TIVA_RCTCL_SETBITS;
tiva_ethout(priv, TIVA_MAC_RCTL_OFFSET, regval);
nllvdbg("RCTL: %08x\n", regval);
/* Setup the time stamp configuration register */
#ifdef TIVA_ETHTS
regval = tiva_ethin(priv, TIVA_MAC_TS_OFFSET);
#ifdef CONFIG_TIVA_TIMESTAMP
regval |= MAC_TS_EN;
#else
regval &= ~(MAC_TS_EN);
#endif
tiva_ethout(priv, TIVA_MAC_TS_OFFSET, regval);
nllvdbg("TS: %08x\n", regval);
#endif
/* Wait for the link to come up. This following is not very conservative
* of system resources -- it really should wait gracefully on a semaphore
* and the interrupt handler should post the semaphore when LINKSTATUS is
* set
*/
nlldbg("Waiting for link\n");
do
{
phyreg = tiva_phyread(priv, MII_MSR);
}
while ((phyreg & MII_MSR_LINKSTATUS) == 0);
nlldbg("Link established\n");
/* Reset the receive FIFO */
regval = tiva_ethin(priv, TIVA_MAC_RCTL_OFFSET);
regval |= MAC_RCTL_RSTFIFO;
tiva_ethout(priv, TIVA_MAC_RCTL_OFFSET, regval);
/* Enable the Ethernet receiver */
regval = tiva_ethin(priv, TIVA_MAC_RCTL_OFFSET);
regval |= MAC_RCTL_RXEN;
tiva_ethout(priv, TIVA_MAC_RCTL_OFFSET, regval);
/* Enable the Ethernet transmitter */
regval = tiva_ethin(priv, TIVA_MAC_TCTL_OFFSET);
regval |= MAC_TCTL_TXEN;
tiva_ethout(priv, TIVA_MAC_TCTL_OFFSET, regval);
/* Reset the receive FIFO (again) */
regval = tiva_ethin(priv, TIVA_MAC_RCTL_OFFSET);
regval |= MAC_RCTL_RSTFIFO;
tiva_ethout(priv, TIVA_MAC_RCTL_OFFSET, regval);
/* Enable the Ethernet interrupt */
#if TIVA_NETHCONTROLLERS > 1
up_enable_irq(priv->irq);
#else
up_enable_irq(TIVA_IRQ_ETHCON);
#endif
/* Enable the Ethernet RX packet receipt interrupt */
regval = tiva_ethin(priv, TIVA_MAC_IM_OFFSET);
regval |= MAC_IM_RXINTM;
tiva_ethout(priv, TIVA_MAC_IM_OFFSET, regval);
/* Program the hardware with it's MAC address (for filtering) */
regval = (uint32_t)priv->ld_dev.d_mac.ether_addr_octet[3] << 24 |
(uint32_t)priv->ld_dev.d_mac.ether_addr_octet[2] << 16 |
(uint32_t)priv->ld_dev.d_mac.ether_addr_octet[1] << 8 |
(uint32_t)priv->ld_dev.d_mac.ether_addr_octet[0];
tiva_ethout(priv, TIVA_MAC_IA0_OFFSET, regval);
regval = (uint32_t)priv->ld_dev.d_mac.ether_addr_octet[5] << 8 |
(uint32_t)priv->ld_dev.d_mac.ether_addr_octet[4];
tiva_ethout(priv, TIVA_MAC_IA1_OFFSET, regval);
/* Set and activate a timer process */
(void)wd_start(priv->ld_txpoll, TIVA_WDDELAY, tiva_polltimer, 1, (uint32_t)priv);
priv->ld_bifup = true;
irqrestore(flags);
return OK;
}
/****************************************************************************
* Function: tiva_ifdown
*
* Description:
* NuttX Callback: Stop the interface. The only way to restore normal
* behavior is to call tiva_ifup().
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int tiva_ifdown(struct net_driver_s *dev)
{
struct tiva_driver_s *priv = (struct tiva_driver_s *)dev->d_private;
irqstate_t flags;
uint32_t regval;
nlldbg("Taking down: %d.%d.%d.%d\n",
dev->d_ipaddr & 0xff, (dev->d_ipaddr >> 8) & 0xff,
(dev->d_ipaddr >> 16) & 0xff, dev->d_ipaddr >> 24 );
/* Cancel the TX poll timer and TX timeout timers */
flags = irqsave();
wd_cancel(priv->ld_txpoll);
wd_cancel(priv->ld_txtimeout);
/* Disable the Ethernet interrupt */
#if TIVA_NETHCONTROLLERS > 1
up_disable_irq(priv->irq);
#else
up_disable_irq(TIVA_IRQ_ETHCON);
#endif
/* Disable all Ethernet controller interrupt sources */
regval = tiva_ethin(priv, TIVA_MAC_IM_OFFSET);
regval &= ~MAC_IM_ALLINTS;
tiva_ethout(priv, TIVA_MAC_IM_OFFSET, regval);
/* Reset the receive FIFO */
regval = tiva_ethin(priv, TIVA_MAC_RCTL_OFFSET);
regval |= MAC_RCTL_RSTFIFO;
tiva_ethout(priv, TIVA_MAC_RCTL_OFFSET, regval);
/* Disable the Ethernet receiver */
regval = tiva_ethin(priv, TIVA_MAC_RCTL_OFFSET);
regval &= ~MAC_RCTL_RXEN;
tiva_ethout(priv, TIVA_MAC_RCTL_OFFSET, regval);
/* Disable the Ethernet transmitter */
regval = tiva_ethin(priv, TIVA_MAC_RCTL_OFFSET);
regval &= ~MAC_TCTL_TXEN;
tiva_ethout(priv, TIVA_MAC_TCTL_OFFSET, regval);
/* Reset the receive FIFO (again) */
regval = tiva_ethin(priv, TIVA_MAC_RCTL_OFFSET);
regval |= MAC_RCTL_RSTFIFO;
tiva_ethout(priv, TIVA_MAC_RCTL_OFFSET, regval);
/* Clear any pending interrupts */
regval = tiva_ethin(priv, TIVA_MAC_RIS_OFFSET);
tiva_ethout(priv, TIVA_MAC_IACK_OFFSET, regval);
/* The interface is now DOWN */
priv->ld_bifup = false;
irqrestore(flags);
return OK;
}
/****************************************************************************
* Function: tiva_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 tiva_txavail(struct net_driver_s *dev)
{
struct tiva_driver_s *priv = (struct tiva_driver_s *)dev->d_private;
irqstate_t flags;
/* Ignore the notification if the interface is not yet up or if the Tx FIFO
* hardware is not available at this time. The NEWTX bit initiates an
* Ethernet transmission once the packet has been placed in the TX FIFO.
* This bit is cleared once the transmission has been completed. When the
* transmission completes, tiva_txdone() will be called and the Tx polling
* will occur at that time.
*/
flags = irqsave();
if (priv->ld_bifup && (tiva_ethin(priv, TIVA_MAC_TR_OFFSET) & MAC_TR_NEWTX) == 0)
{
/* If the interface is up and we can use the Tx FIFO, then poll uIP
* for new Tx data
*/
(void)devif_poll(&priv->ld_dev, tiva_txpoll);
}
irqrestore(flags);
return OK;
}
/****************************************************************************
* Function: tiva_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 tiva_addmac(struct net_driver_s *dev, FAR const uint8_t *mac)
{
FAR struct tiva_driver_s *priv = (FAR struct tiva_driver_s *)dev->d_private;
/* Add the MAC address to the hardware multicast routing table */
#warning "Multicast MAC support not implemented"
return OK;
}
#endif
/****************************************************************************
* Function: tiva_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 tiva_rmmac(struct net_driver_s *dev, FAR const uint8_t *mac)
{
FAR struct tiva_driver_s *priv = (FAR struct tiva_driver_s *)dev->d_private;
/* Add the MAC address to the hardware multicast routing table */
#warning "Multicast MAC support not implemented"
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: tiva_ethinitialize
*
* Description:
* Initialize the Ethernet driver for one interface
*
* Parameters:
* None
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
#if TIVA_NETHCONTROLLERS > 1
int tiva_ethinitialize(int intf)
#else
static inline int tiva_ethinitialize(int intf)
#endif
{
struct tiva_driver_s *priv = &g_lm3sdev[intf];
int ret;
/* Check if the Ethernet module is present */
ndbg("Setting up eth%d\n", intf);
#if TIVA_NETHCONTROLLERS > 1
# error "This debug check only works with one interface"
#else
DEBUGASSERT((getreg32(TIVA_SYSCON_DC4) & (SYSCON_DC4_EMAC0|SYSCON_DC4_EPHY0)) == (SYSCON_DC4_EMAC0|SYSCON_DC4_EPHY0));
#endif
DEBUGASSERT((unsigned)intf < TIVA_NETHCONTROLLERS);
/* Initialize the driver structure */
memset(priv, 0, sizeof(struct tiva_driver_s));
priv->ld_dev.d_ifup = tiva_ifup; /* I/F down callback */
priv->ld_dev.d_ifdown = tiva_ifdown; /* I/F up (new IP address) callback */
priv->ld_dev.d_txavail = tiva_txavail; /* New TX data callback */
#ifdef CONFIG_NET_IGMP
priv->ld_dev.d_addmac = tiva_addmac; /* Add multicast MAC address */
priv->ld_dev.d_rmmac = tiva_rmmac; /* Remove multicast MAC address */
#endif
priv->ld_dev.d_private = (void*)priv; /* Used to recover private state from dev */
/* Create a watchdog for timing polling for and timing of transmissions */
#if TIVA_NETHCONTROLLERS > 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 tiva_ifup()
* is called (and the MAC can be overwritten with a netdev ioctl call).
*/
#ifdef CONFIG_TIVA_BOARDMAC
tiva_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 tiva_ifup() is called.
*/
tiva_ethreset(priv);
tiva_ifdown(&priv->ld_dev);
/* Attach the IRQ to the driver */
#if TIVA_NETHCONTROLLERS > 1
ret = irq_attach(priv->irq, tiva_interrupt);
#else
ret = irq_attach(TIVA_IRQ_ETHCON, tiva_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, NET_LL_ETHERNET);
return OK;
}
/************************************************************************************
* Name: up_netinitialize
*
* Description:
* Initialize the first network interface. If there are more than one interface
* in the chip, then board-specific logic will have to provide this function to
* determine which, if any, Ethernet controllers should be initialized.
*
************************************************************************************/
#if TIVA_NETHCONTROLLERS == 1
void up_netinitialize(void)
{
(void)tiva_ethinitialize(0);
}
#endif
#endif /* CONFIG_NET && CONFIG_TIVA_ETHERNET */
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