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nuttx/drivers/net/enc28j60.c
patacongo 28dc6e461d In progress changes for OLED display work 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2669 42af7a65-404d-4744-a932-0658087f49c3
2010-05-15 01:15:52 +00:00

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/****************************************************************************
* drivers/net/enc28j60.c
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* References:
* - ENC28J60 Data Sheet, Stand-Alone Ethernet Controller with SPI Interface,
* DS39662C, 2008 Microchip Technology Inc.
*
* 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_ENC28J60)
#include <stdint.h>
#include <stdbool.h>
#include <stdint.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/spi.h>
#include <nuttx/wqueue.h>
#include <nuttx/clock.h>
#include <nuttx/enc28j60.h>
#include <net/uip/uip.h>
#include <net/uip/uip-arp.h>
#include <net/uip/uip-arch.h>
#include "enc28j60.h"
/****************************************************************************
* Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* ENC28J60 Configuration Settings:
*
* CONFIG_NET_ENC28J60 - Enabled ENC28J60 support
* CONFIG_ENC28J60_SPIMODE - Controls the SPI mode
* CONFIG_ENC28J60_FREQUENCY - Define to use a different bus frequency
* CONFIG_ENC28J60_NINTERFACES - Specifies the number of physical ENC28J60
* devices that will be supported.
* CONFIG_ENC28J60_STATS - Collect network statistics
* CONFIG_ENC28J60_HALFDUPPLEX - Default is full duplex
*/
/* The ENC28J60 spec says that is supports SPI mode 0,0 only. However,
* somtimes you need to tinker with these things.
*/
#ifndef CONFIG_ENC28J60_SPIMODE
# define CONFIG_ENC28J60_SPIMODE SPIDEV_MODE2
#endif
/* CONFIG_ENC28J60_NINTERFACES determines the number of physical interfaces
* that will be supported.
*/
#ifndef CONFIG_ENC28J60_NINTERFACES
# define CONFIG_ENC28J60_NINTERFACES 1
#endif
/* CONFIG_NET_BUFSIZE must always be defined */
#if !defined(CONFIG_NET_BUFSIZE) && (CONFIG_NET_BUFSIZE <= MAX_FRAMELEN)
# error "CONFIG_NET_BUFSIZE is not valid for the ENC28J60"
#endif
/* We need to have the work queue to handle SPI interrupts */
#if !defined(CONFIG_SCHED_WORKQUEUE) && !defined(CONFIG_SPI_OWNBUS)
# error "Worker thread support is required (CONFIG_SCHED_WORKQUEUE)"
#endif
/* CONFIG_ENC28J60_DUMPPACKET will dump the contents of each packet to the console. */
#ifdef CONFIG_ENC28J60_DUMPPACKET
# define enc_dumppacket(m,a,n) lib_dumpbuffer(m,a,n)
#else
# define enc_dumppacket(m,a,n)
#endif
/* Timing *******************************************************************/
/* TX poll deley = 1 seconds. CLK_TCK is the number of clock ticks per second */
#define ENC_WDDELAY (1*CLK_TCK)
#define ENC_POLLHSEC (1*2)
/* TX timeout = 1 minute */
#define ENC_TXTIMEOUT (60*CLK_TCK)
/* Poll timeout */
#define ENC_POLLTIMEOUT MSEC2TICK(50)
/* Packet Memory ************************************************************/
/* Packet memory layout */
#define ALIGNED_BUFSIZE ((CONFIG_NET_BUFSIZE + 255) & ~255)
#define PKTMEM_TX_START 0x0000 /* Start TX buffer at 0 */
#define PKTMEM_TX_ENDP1 ALIGNED_BUFSIZE /* Allow TX buffer for one frame + */
#define PKTMEM_RX_START PKTMEM_TX_ENDP1 /* Followed by RX buffer */
#define PKTMEM_RX_END PKTMEM_END /* RX buffer goes to the end of SRAM */
/* Misc. Helper Macros ******************************************************/
#define enc_rdgreg(priv,ctrlreg) \
enc_rdgreg2(priv, ENC_RCR | GETADDR(ctrlreg))
#define enc_wrgreg(priv,ctrlreg,wrdata) \
enc_wrgreg2(priv, ENC_WCR | GETADDR(ctrlreg), wrdata)
#define enc_bfcgreg(priv,ctrlreg,clrbits) \
enc_wrgreg2(priv, ENC_BFC | GETADDR(ctrlreg), clrbits)
#define enc_bfsgreg(priv,ctrlreg,setbits) \
enc_wrgreg2(priv, ENC_BFS | GETADDR(ctrlreg), setbits)
/* This is a helper pointer for accessing the contents of the Ethernet header */
#define BUF ((struct uip_eth_hdr *)priv->dev.d_buf)
/****************************************************************************
* Private Types
****************************************************************************/
/* The enc_driver_s encapsulates all state information for a single hardware
* interface
*/
struct enc_driver_s
{
/* Device control */
bool bifup; /* true:ifup false:ifdown */
uint8_t bank; /* Currently selected bank */
uint16_t nextpkt; /* Next packet address */
int irq; /* GPIO IRQ configured for the ENC28J60 */
/* Timing */
WDOG_ID txpoll; /* TX poll timer */
WDOG_ID txtimeout; /* TX timeout timer */
/* We we don't own the SPI bus, then we cannot do SPI accesses from the
* interrupt handler.
*/
#ifndef CONFIG_SPI_OWNBUS
struct work_s work; /* Work queue support */
#endif
/* This is the contained SPI driver intstance */
FAR struct spi_dev_s *spi;
/* This holds the information visible to uIP/NuttX */
struct uip_driver_s dev; /* Interface understood by uIP */
/* Statistics */
#ifdef CONFIG_ENC28J60_STATS
struct enc_stats_s stats;
#endif
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct enc_driver_s g_enc28j60[CONFIG_ENC28J60_NINTERFACES];
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Low-level SPI helpers */
static inline void enc_configspi(FAR struct spi_dev_s *spi);
#ifdef CONFIG_SPI_OWNBUS
static inline void enc_select(FAR struct spi_dev_s *spi);
static inline void enc_deselect(FAR struct spi_dev_s *spi);
#else
static void enc_select(FAR struct spi_dev_s *spi);
static void enc_deselect(FAR struct spi_dev_s *spi);
#endif
/* SPI control register access */
static uint8_t enc_rdgreg2(FAR struct enc_driver_s *priv, uint8_t cmd);
static void enc_wrgreg2(FAR struct enc_driver_s *priv, uint8_t cmd,
uint8_t wrdata);
static void enc_setbank(FAR struct enc_driver_s *priv, uint8_t bank);
static uint8_t enc_rdbreg(FAR struct enc_driver_s *priv, uint8_t ctrlreg);
static void enc_wrbreg(FAR struct enc_driver_s *priv, uint8_t ctrlreg,
uint8_t wrdata);
static int enc_waitbreg(FAR struct enc_driver_s *priv, uint8_t ctrlreg,
uint8_t bits, uint8_t value);
/* SPI buffer transfers */
static void enc_rdbuffer(FAR struct enc_driver_s *priv, FAR uint8_t *buffer,
size_t buflen);
static void enc_wrbuffer(FAR struct enc_driver_s *priv,
FAR const uint8_t *buffer, size_t buflen);
/* PHY register access */
static uint16_t enc_rdphy(FAR struct enc_driver_s *priv, uint8_t phyaddr);
static void enc_wrphy(FAR struct enc_driver_s *priv, uint8_t phyaddr,
uint16_t phydata);
/* Common TX logic */
static int enc_transmit(FAR struct enc_driver_s *priv);
static int enc_uiptxpoll(struct uip_driver_s *dev);
/* Interrupt handling */
static void enc_linkstatus(FAR struct enc_driver_s *priv);
static void enc_txif(FAR struct enc_driver_s *priv);
static void enc_txerif(FAR struct enc_driver_s *priv);
static void enc_txerif(FAR struct enc_driver_s *priv);
static void enc_rxerif(FAR struct enc_driver_s *priv);
static void enc_rxdispath(FAR struct enc_driver_s *priv);
static void enc_pktif(FAR struct enc_driver_s *priv);
static void enc_worker(FAR void *arg);
static int enc_interrupt(int irq, FAR void *context);
/* Watchdog timer expirations */
static void enc_polltimer(int argc, uint32_t arg, ...);
static void enc_txtimeout(int argc, uint32_t arg, ...);
/* NuttX callback functions */
static int enc_ifup(struct uip_driver_s *dev);
static int enc_ifdown(struct uip_driver_s *dev);
static int enc_txavail(struct uip_driver_s *dev);
/* Initialization */
static void enc_pwrsave(FAR struct enc_driver_s *priv);
static void enc_pwrfull(FAR struct enc_driver_s *priv);
static void enc_setmacaddr(FAR struct enc_driver_s *priv);
static int enc_reset(FAR struct enc_driver_s *priv);
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: enc_configspi
*
* Description:
* Configure the SPI for use with the ENC28J60
*
* Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static inline void enc_configspi(FAR struct spi_dev_s *spi)
{
/* Configure SPI for the ENC28J60. But only if we own the SPI bus.
* Otherwise, don't bother because it might change.
*/
#ifdef CONFIG_SPI_OWNBUS
SPI_SETMODE(spi, CONFIG_ENC28J60_SPIMODE);
SPI_SETBITS(spi, 8);
#ifdef CONFIG_ENC28J60_FREQUENCY
SPI_SETFREQUENCY(spi, CONFIG_ENC28J60_FREQUENCY)
#endif
#endif
}
/****************************************************************************
* Function: enc_select
*
* Description:
* Select the SPI, locking and re-configuring if necessary
*
* Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_SPI_OWNBUS
static inline void enc_select(FAR struct spi_dev_s *spi)
{
/* We own the SPI bus, so just select the chip */
SPI_SELECT(spi, SPIDEV_ETHERNET, true);
}
#else
static void enc_select(FAR struct spi_dev_s *spi)
{
/* Select ENC28J60 chip (locking the SPI bus in case there are multiple
* devices competing for the SPI bus
*/
SPI_LOCK(spi, true);
SPI_SELECT(spi, SPIDEV_ETHERNET, true);
/* Now make sure that the SPI bus is configured for the ENC28J60 (it
* might have gotten configured for a different device while unlocked)
*/
SPI_SETMODE(spi, CONFIG_ENC28J60_SPIMODE);
SPI_SETBITS(spi, 8);
#ifdef CONFIG_ENC28J60_FREQUENCY
SPI_SETFREQUENCY(spi, CONFIG_ENC28J60_FREQUENCY);
#endif
}
#endif
/****************************************************************************
* Function: enc_deselect
*
* Description:
* De-select the SPI
*
* Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_SPI_OWNBUS
static inline void enc_deselect(FAR struct spi_dev_s *spi)
{
/* We own the SPI bus, so just de-select the chip */
SPI_SELECT(spi, SPIDEV_ETHERNET, false);
}
#else
static void enc_deselect(FAR struct spi_dev_s *spi)
{
/* De-select ENC28J60 chip and relinquish the SPI bus. */
SPI_SELECT(spi, SPIDEV_ETHERNET, false);
SPI_LOCK(spi, false);
}
#endif
/****************************************************************************
* Function: enc_rdgreg2
*
* Description:
* Read a global register (EIE, EIR, ESTAT, ECON2, or ECON1). The cmd
* include the CMD 'OR'd with the the global address register.
*
* Parameters:
* priv - Reference to the driver state structure
* cmd - The full command to received (cmd | address)
*
* Returned Value:
* The value read from the register
*
* Assumptions:
*
****************************************************************************/
static uint8_t enc_rdgreg2(FAR struct enc_driver_s *priv, uint8_t cmd)
{
FAR struct spi_dev_s *spi;
uint8_t rddata;
DEBUGASSERT(priv && priv->spi);
spi = priv->spi;
/* Select ENC28J60 chip */
enc_select(spi);
/* Send the read command and collect the data. The sequence requires
* 16-clocks: 8 to clock out the cmd + 8 to clock in the data.
*/
(void)SPI_SEND(spi, cmd); /* Clock out the command */
rddata = SPI_SEND(spi, 0); /* Clock in the data */
/* De-select ENC28J60 chip */
enc_deselect(spi);
return rddata;
}
/****************************************************************************
* Function: enc_wrgreg2
*
* Description:
* Write to a global register (EIE, EIR, ESTAT, ECON2, or ECON1). The cmd
* include the CMD 'OR'd with the the global address register.
*
* Parameters:
* priv - Reference to the driver state structure
* cmd - The full command to received (cmd | address)
* wrdata - The data to send
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_wrgreg2(FAR struct enc_driver_s *priv, uint8_t cmd,
uint8_t wrdata)
{
FAR struct spi_dev_s *spi;
DEBUGASSERT(priv && priv->spi);
spi = priv->spi;
/* Select ENC28J60 chip */
enc_select(spi);
/* Send the write command and data. The sequence requires 16-clocks:
* 8 to clock out the cmd + 8 to clock out the data.
*/
(void)SPI_SEND(spi, cmd); /* Clock out the command */
(void)SPI_SEND(spi, wrdata); /* Clock out the data */
/* De-select ENC28J60 chip. */
enc_deselect(spi);
}
/****************************************************************************
* Function: enc_setbank
*
* Description:
* Set the bank for these next control register access.
*
* Assumption:
* The caller has exclusive access to the SPI bus
*
* Parameters:
* priv - Reference to the driver state structure
* bank - The bank to select (0-3)
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_setbank(FAR struct enc_driver_s *priv, uint8_t bank)
{
/* Check if the bank setting has changed*/
if (bank != priv->bank)
{
/* Select bank 0 (just so that all of the bits are cleared) */
enc_bfcgreg(priv, ENC_ECON1, ECON1_BSEL_MASK);
/* Then OR in bits to get the correct bank */
if (bank != 0)
{
enc_bfsgreg(priv, ENC_ECON1, (bank << ECON1_BSEL_SHIFT));
}
/* Then remember the bank setting */
priv->bank = bank;
}
}
/****************************************************************************
* Function: enc_rdbreg
*
* Description:
* Read from a banked control register using the RCR command.
*
* Parameters:
* priv - Reference to the driver state structure
* ctrlreg - Bit encoded address of banked register to read
*
* Returned Value:
* The byte read from the banked register
*
* Assumptions:
*
****************************************************************************/
static uint8_t enc_rdbreg(FAR struct enc_driver_s *priv, uint8_t ctrlreg)
{
FAR struct spi_dev_s *spi;
uint8_t rddata;
DEBUGASSERT(priv && priv->spi);
spi = priv->spi;
/* Select ENC28J60 chip */
enc_select(spi);
/* Set the bank */
enc_setbank(priv, GETBANK(ctrlreg));
/* Send the RCR command and collect the data. How we collect the data
* depends on if this is a PHY/CAN or not. The normal sequence requires
* 16-clocks: 8 to clock out the cmd and 8 to clock in the data.
*/
(void)SPI_SEND(spi, ENC_RCR | GETADDR(ctrlreg)); /* Clock out the command */
if (ISPHYMAC(ctrlreg))
{
/* The PHY/MAC sequence requires 24-clocks: 8 to clock out the cmd,
* 8 dummy bits, and 8 to clock in the PHY/MAC data.
*/
(void)SPI_SEND(spi,0); /* Clock in the dummy byte */
}
rddata = SPI_SEND(spi, 0); /* Clock in the data */
/* De-select ENC28J60 chip */
enc_deselect(spi);
return rddata;
}
/****************************************************************************
* Function: enc_wrbreg
*
* Description:
* Write to a banked control register using the WCR command. Unlike
* reading, this same SPI sequence works for normal, MAC, and PHY
* registers.
*
* Parameters:
* priv - Reference to the driver state structure
* ctrlreg - Bit encoded address of banked register to write
* wrdata - The data to send
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_wrbreg(FAR struct enc_driver_s *priv, uint8_t ctrlreg,
uint8_t wrdata)
{
FAR struct spi_dev_s *spi;
DEBUGASSERT(priv && priv->spi);
spi = priv->spi;
/* Select ENC28J60 chip */
enc_select(spi);
/* Set the bank */
enc_setbank(priv, GETBANK(ctrlreg));
/* Send the WCR command and data. The sequence requires 16-clocks:
* 8 to clock out the cmd + 8 to clock out the data.
*/
(void)SPI_SEND(spi, ENC_WCR | GETADDR(ctrlreg)); /* Clock out the command */
(void)SPI_SEND(spi, wrdata); /* Clock out the data */
/* De-select ENC28J60 chip. */
enc_deselect(spi);
}
/****************************************************************************
* Function: enc_waitbreg
*
* Description:
* Wait until banked register bit(s) take a specific value (or a timeout
* occurs).
*
* Parameters:
* priv - Reference to the driver state structure
* ctrlreg - Bit encoded address of banked register to check
* bits - The bits to check (a mask)
* value - The value of the bits to return (value under mask)
*
* Returned Value:
* OK on success, negated errno on failure
*
* Assumptions:
*
****************************************************************************/
static int enc_waitbreg(FAR struct enc_driver_s *priv, uint8_t ctrlreg,
uint8_t bits, uint8_t value)
{
uint32_t start = g_system_timer;
uint32_t elapsed;
uint8_t rddata;
/* Loop until the exit condition is met */
do
{
/* Read the byte from the requested banked register */
rddata = enc_rdbreg(priv, ctrlreg);
elapsed = g_system_timer - start;
}
while ((rddata & bits) != value || elapsed > ENC_POLLTIMEOUT);
return (rddata & bits) == value ? -ETIMEDOUT : OK;
}
/****************************************************************************
* Function: enc_rdbuffer
*
* Description:
* Read a buffer of data.
*
* Parameters:
* priv - Reference to the driver state structure
* buffer - A pointer to the buffer to read into
* buflen - The number of bytes to read
*
* Returned Value:
* None
*
* Assumptions:
* Read pointer is set to the correct address
*
****************************************************************************/
static void enc_rdbuffer(FAR struct enc_driver_s *priv, FAR uint8_t *buffer,
size_t buflen)
{
FAR struct spi_dev_s *spi;
DEBUGASSERT(priv && priv->spi);
spi = priv->spi;
/* Select ENC28J60 chip */
enc_select(spi);
/* Send the read buffer memory command (ignoring the response) */
(void)SPI_SEND(spi, ENC_RBM);
/* Then read the buffer data */
SPI_RECVBLOCK(spi, buffer, buflen);
/* De-select ENC28J60 chip. */
enc_deselect(spi);
}
/****************************************************************************
* Function: enc_wrbuffer
*
* Description:
* Write a buffer of data.
*
* Parameters:
* priv - Reference to the driver state structure
* buffer - A pointer to the buffer to write from
* buflen - The number of bytes to write
*
* Returned Value:
* None
*
* Assumptions:
* Read pointer is set to the correct address
*
****************************************************************************/
static void enc_wrbuffer(FAR struct enc_driver_s *priv,
FAR const uint8_t *buffer, size_t buflen)
{
FAR struct spi_dev_s *spi;
DEBUGASSERT(priv && priv->spi);
spi = priv->spi;
/* Select ENC28J60 chip */
enc_select(spi);
/* Send the write buffer memory command (ignoring the response) */
(void)SPI_SEND(spi, ENC_WBM);
/* Then send the buffer */
SPI_SNDBLOCK(spi, buffer, buflen);
/* De-select ENC28J60 chip. */
enc_deselect(spi);
}
/****************************************************************************
* Function: enc_rdphy
*
* Description:
* Read 16-bits of PHY data.
*
* Parameters:
* priv - Reference to the driver state structure
* phyaddr - The PHY register address
*
* Returned Value:
* 16-bit value read from the PHY
*
* Assumptions:
*
****************************************************************************/
static uint16_t enc_rdphy(FAR struct enc_driver_s *priv, uint8_t phyaddr)
{
uint16_t data = 0;
/* Set the PHY address (and start the PHY read operation) */
enc_wrbreg(priv, ENC_MIREGADR, phyaddr);
enc_wrbreg(priv, ENC_MICMD, MICMD_MIIRD);
/* Wait until the PHY read completes */
if (enc_waitbreg(priv, ENC_MISTAT, MISTAT_BUSY, 0x00) == OK);
{
/* Terminate reading */
enc_wrbreg(priv, ENC_MICMD, 0x00);
/* Get the PHY data */
data = (uint16_t)enc_rdbreg(priv, ENC_MIRDL);
data |= (uint16_t)enc_rdbreg(priv, ENC_MIRDH) << 8;
}
return data;
}
/****************************************************************************
* Function: enc_wrphy
*
* Description:
* write 16-bits of PHY data.
*
* Parameters:
* priv - Reference to the driver state structure
* phyaddr - The PHY register address
* phydata - 16-bit data to write to the PHY
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_wrphy(FAR struct enc_driver_s *priv, uint8_t phyaddr,
uint16_t phydata)
{
/* Set the PHY register address */
enc_wrbreg(priv, ENC_MIREGADR, phyaddr);
/* Write the PHY data */
enc_wrbreg(priv, ENC_MIWRL, phydata);
enc_wrbreg(priv, ENC_MIWRH, phydata >> 8);
/* Wait until the PHY write completes */
enc_waitbreg(priv, ENC_MISTAT, MISTAT_BUSY, 0x00);
}
/****************************************************************************
* Function: enc_transmit
*
* Description:
* Start hardware transmission. Called either from:
*
* - pkif interrupt when an application responds to the receipt of data
* by trying to send something, or
* - From watchdog based polling.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
*
****************************************************************************/
static int enc_transmit(FAR struct enc_driver_s *priv)
{
uint16_t txend;
/* Increment statistics */
nllvdbg("Sending packet, pktlen: %d\n", priv->dev.d_len);
#ifdef CONFIG_ENC28J60_STATS
priv->stats.txrequests++;
#endif
/* Verify that the hardware is ready to send another packet. The driver
* starts a transmission process by setting ECON1.TXRTS. When the packet is
* finished transmitting or is aborted due to an error/cancellation, the
* ECON1.TXRTS bit will be cleared.
*
* NOTE: If we got here, then we have committed to sending a packet.
* higher level logic must have assured that (1) there is no transmission
* in progress, and that (2) TX-related interrupts are disabled.
*/
DEBUGASSERT((enc_rdgreg(priv, ENC_ECON1) & ECON1_TXRTS) == 0);
/* Send the packet: address=priv->dev.d_buf, length=priv->dev.d_len */
enc_dumppacket("Transmit Packet", priv->dev.d_buf, priv->dev.d_len);
/* Reset the write pointer to start of transmit buffer */
enc_wrbreg(priv, ENC_EWRPTL, PKTMEM_TX_START & 0xff);
enc_wrbreg(priv, ENC_EWRPTH, PKTMEM_TX_START >> 8);
/* Set the TX End pointer based on the size of the packet to send */
txend = PKTMEM_TX_START + priv->dev.d_len;
enc_wrbreg(priv, ENC_ETXNDL, txend & 0xff);
enc_wrbreg(priv, ENC_ETXNDH, txend >> 8);
/* Write the per-packet control byte into the transmit buffer */
enc_wrgreg(priv, ENC_WBM, 0x00);
/* Copy the packet itself into the transmit buffer */
enc_wrbuffer(priv, priv->dev.d_buf, priv->dev.d_len);
/* Set TXRTS to send the packet in the transmit buffer */
enc_bfsgreg(priv, ENC_ECON1, ECON1_TXRTS);
/* Setup the TX timeout watchdog (perhaps restarting the timer). Note:
* Is there a race condition. Could the TXIF interrupt occur before
* the timer is started?
*/
(void)wd_start(priv->txtimeout, ENC_TXTIMEOUT, enc_txtimeout, 1, (uint32_t)priv);
return OK;
}
/****************************************************************************
* Function: enc_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 enc_uiptxpoll(struct uip_driver_s *dev)
{
FAR struct enc_driver_s *priv = (FAR struct enc_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.
*/
nllvdbg("Poll result: d_len=%d\n", priv->dev.d_len);
if (priv->dev.d_len > 0)
{
uip_arp_out(&priv->dev);
enc_transmit(priv);
/* Stop the poll now because we can queue only one packet */
return -EBUSY;
}
/* If zero is returned, the polling will continue until all connections have
* been examined.
*/
return OK;
}
/****************************************************************************
* Function: enc_linkstatus
*
* Description:
* The current link status can be obtained from the PHSTAT1.LLSTAT or
* PHSTAT2.LSTAT.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_linkstatus(FAR struct enc_driver_s *priv)
{
#if 0
uint16_t regval = enc_rdphy(priv, ENC_PHSTAT2);
priv->duplex = ((regval & PHSTAT2_DPXSTAT) != 0);
priv->carrier = ((regval & PHSTAT2_LSTAT) != 0);
#endif
}
/****************************************************************************
* Function: enc_txif
*
* Description:
* An TXIF 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 enc_txif(FAR struct enc_driver_s *priv)
{
/* Update statistics */
#ifdef CONFIG_ENC28J60_STATS
priv->stats.txifs++;
if (enc_rdgreg(priv, ENC_ESTAT) & ESTAT_TXABRT)
{
priv->stats.txabrts++;
}
#endif
/* Clear the request to send bit */
enc_bfcgreg(priv, ENC_ECON1, ECON1_TXRTS);
/* If no further xmits are pending, then cancel the TX timeout */
wd_cancel(priv->txtimeout);
/* Then poll uIP for new XMIT data */
(void)uip_poll(&priv->dev, enc_uiptxpoll);
}
/****************************************************************************
* Function: enc_txerif
*
* Description:
* An TXERIF interrupt was received indicating that a TX abort has occurred.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_txerif(FAR struct enc_driver_s *priv)
{
/* Update statistics */
#ifdef CONFIG_ENC28J60_STATS
priv->stats.txerifs++;
#endif
/* Reset TX */
enc_bfsgreg(priv, ENC_ECON1, ECON1_TXRST);
enc_bfcgreg(priv, ENC_ECON1, ECON1_TXRST | ECON1_TXRTS);
/* Here we really should re-transmit (I fact, if we want half duplex to
* work right, then it is necessary to do this!):
*
* 1. Read the TSV:
* - Read ETXNDL to get the end pointer
* - Read 7 bytes from that pointer + 1 using ENC_RMB.
* 2. Determine if we need to retransmit. Check the LATE COLLISION bit, if
* set, then we need to transmit.
* 3. Retranmit by resetting ECON1_TXRTS.
*/
#ifdef CONFIG_ENC28J60_HALFDUPLEX
# error "Missing logic for half duplex"
#endif
}
/****************************************************************************
* Function: enc_rxerif
*
* Description:
* An RXERIF 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 enc_rxerif(FAR struct enc_driver_s *priv)
{
/* Update statistics */
#ifdef CONFIG_ENC28J60_STATS
priv->stats.rxerifs++;
#endif
}
/****************************************************************************
* Function: enc_rxdispath
*
* Description:
* Give the newly received packet to uIP.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_rxdispath(FAR struct enc_driver_s *priv)
{
/* 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
{
nllvdbg("IP packet received (%02x)\n", BUF->type);
uip_arp_ipin();
uip_input(&priv->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)
{
uip_arp_out(&priv->dev);
enc_transmit(priv);
}
}
else if (BUF->type == htons(UIP_ETHTYPE_ARP))
{
nllvdbg("ARP packet received (%02x)\n", BUF->type);
uip_arp_arpin(&priv->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)
{
enc_transmit(priv);
}
}
else
{
nlldbg("Unsupported packet type dropped (%02x)\n", htons(BUF->type));
}
}
/****************************************************************************
* Function: enc_pktif
*
* 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 enc_pktif(FAR struct enc_driver_s *priv)
{
uint8_t rsv[6];
uint16_t pktlen;
uint16_t rxstat;
/* Update statistics */
#ifdef CONFIG_ENC28J60_STATS
priv->stats.pktifs++;
#endif
/* Set the read pointer to the start of the received packet */
DEBUGASSERT(priv->nextpkt <= PKTMEM_RX_END);
enc_wrbreg(priv, ENC_ERDPTL, (priv->nextpkt));
enc_wrbreg(priv, ENC_ERDPTH, (priv->nextpkt) >> 8);
/* Read the next packet pointer and the 4 byte read status vector (RSV)
* at the beginning of the received packet
*/
enc_rdbuffer(priv, rsv, 6);
/* Decode the new next packet pointer, and the RSV. The
* RSV is encoded as:
*
* Bits 0-15: Indicates length of the received frame. This includes the
* destination address, source address, type/length, data,
* padding and CRC fields. This field is stored in little-
* endian format.
* Bits 16-31: Bit encoded RX status.
*/
priv->nextpkt = (uint16_t)rsv[1] << 8 | (uint16_t)rsv[0];
pktlen = (uint16_t)rsv[3] << 8 | (uint16_t)rsv[2];
rxstat = (uint16_t)rsv[5] << 8 | (uint16_t)rsv[4];
nllvdbg("Receiving packet, pktlen: %d\n", pktlen);
/* Check if the packet was received OK */
if ((rxstat & RXSTAT_OK) == 0)
{
nlldbg("ERROR: RXSTAT: %04x\n", rxstat);
#ifdef CONFIG_ENC28J60_STATS
priv->stats.rxnotok++;
#endif
}
/* Check for a usable packet length (4 added for the CRC) */
else if (pktlen > (CONFIG_NET_BUFSIZE + 4) || pktlen <= (UIP_LLH_LEN + 4))
{
nlldbg("Bad packet size dropped (%d)\n", pktlen);
#ifdef CONFIG_ENC28J60_STATS
priv->stats.rxpktlen++;
#endif
}
/* Otherwise, read and process the packet */
else
{
/* Save the packet length (without the 4 byte CRC) in priv->dev.d_len*/
priv->dev.d_len = pktlen - 4;
/* Copy the data data from the receive buffer to priv->dev.d_buf */
enc_rdbuffer(priv, priv->dev.d_buf, priv->dev.d_len);
enc_dumppacket("Received Packet", priv->ld_dev.d_buf, priv->ld_dev.d_len);
/* Dispatch the packet to uIP */
enc_rxdispath(priv);
}
/* Move the RX read pointer to the start of the next received packet.
* This frees the memory we just read.
*/
enc_wrbreg(priv, ENC_ERXRDPTL, (priv->nextpkt));
enc_wrbreg(priv, ENC_ERXRDPTH, (priv->nextpkt) >> 8);
/* Decrement the packet counter indicate we are done with this packet */
enc_bfsgreg(priv, ENC_ECON2, ECON2_PKTDEC);
}
/****************************************************************************
* Function: enc_worker
*
* Description:
* Perform interrupt handling logic outside of the interrupt handler (on
* the work queue thread).
*
* Parameters:
* arg - The reference to the driver structure (case to void*)
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_worker(FAR void *arg)
{
FAR struct enc_driver_s *priv = (FAR struct enc_driver_s *)arg;
uint8_t eir;
DEBUGASSERT(priv);
/* Disable further interrupts by clearing the global interrup enable bit */
enc_bfcgreg(priv, ENC_EIE, EIE_INTIE);
/* Loop until all interrupts have been processed (EIR==0). Note that
* there is no infinite loop check... if there are always pending interrupts,
* we are just broken.
*/
while ((eir = enc_rdgreg(priv, ENC_EIR) & EIR_ALLINTS) != 0)
{
/* Handle interrupts according to interrupt register register bit
* settings
*
* DMAIF: The DMA interrupt indicates that the DMA module has completed
* its memory copy or checksum calculation. Additionally, this interrupt
* will be caused if the host controller cancels a DMA operation by
* manually clearing the DMAST bit. Once set, DMAIF can only be cleared
* by the host controller or by a Reset condition.
*/
if ((eir & EIR_DMAIF) != 0) /* DMA interrupt */
{
/* Not used by this driver. Just clear the interrupt request. */
enc_bfcgreg(priv, ENC_EIR, EIR_DMAIF);
}
/* LINKIF: The LINKIF indicates that the link status has changed.
* The actual current link status can be obtained from the
* PHSTAT1.LLSTAT or PHSTAT2.LSTAT. Unlike other interrupt sources, the
* link status change interrupt is created in the integrated PHY
* module.
*
* To receive it, the host controller must set the PHIE.PLNKIE and
* PGEIE bits. After setting the two PHY interrupt enable bits, the
* LINKIF bit will then shadow the contents of the PHIR.PGIF bit.
*
* Once LINKIF is set, it can only be cleared by the host controller or
* by a Reset. The LINKIF bit is read-only. Performing an MII read on
* the PHIR register will clear the LINKIF, PGIF and PLNKIF bits
* automatically and allow for future link status change interrupts.
*/
if ((eir & EIR_LINKIF) != 0) /* Link change interrupt */
{
enc_linkstatus(priv); /* Get current link status */
enc_rdphy(priv, ENC_PHIR); /* Clear the LINKIF interrupt */
}
/* TXIF: The Transmit Interrupt Flag (TXIF) is used to indicate that
* the requested packet transmission has ended. Upon transmission
* completion, abort or transmission cancellation by the host
* controller, the EIR.TXIF flag will be set to 1.
*
* Once TXIF is set, it can only be cleared by the host controller
* or by a Reset condition. Once processed, the host controller should
* use the BFC command to clear the EIR.TXIF bit.
*/
if ((eir & EIR_TXIF) != 0) /* Transmit interrupt */
{
enc_txif(priv); /* Handle TX completion */
enc_bfcgreg(priv, ENC_EIR, EIR_TXIF); /* Clear the TXIF interrupt */
}
/* TXERIF: The Transmit Error Interrupt Flag (TXERIF) is used to
* indicate that a transmit abort has occurred. An abort can occur
* because of any of the following:
*
* 1. Excessive collisions occurred as defined by the Retransmission
* Maximum (RETMAX) bits in the MACLCON1 register.
* 2. A late collision occurred as defined by the Collision Window
* (COLWIN) bits in the MACLCON2 register.
* 3. A collision after transmitting 64 bytes occurred (ESTAT.LATECOL
* set).
* 4. The transmission was unable to gain an opportunity to transmit
* the packet because the medium was constantly occupied for too long.
* The deferral limit (2.4287 ms) was reached and the MACON4.DEFER bit
* was clear.
* 5. An attempt to transmit a packet larger than the maximum frame
* length defined by the MAMXFL registers was made without setting
* the MACON3.HFRMEN bit or per packet POVERRIDE and PHUGEEN bits.
*
* Upon any of these conditions, the EIR.TXERIF flag is set to 1. Once
* set, it can only be cleared by the host controller or by a Reset
* condition.
*
* After a transmit abort, the TXRTS bit will be cleared, the
* ESTAT.TXABRT bit will be set and the transmit status vector will be
* written at ETXND + 1. The MAC will not automatically attempt to
* retransmit the packet. The host controller may wish to read the
* transmit status vector and LATECOL bit to determine the cause of
* the abort. After determining the problem and solution, the host
* controller should clear the LATECOL (if set) and TXABRT bits so
* that future aborts can be detected accurately.
*
* In Full-Duplex mode, condition 5 is the only one that should cause
* this interrupt. Collisions and other problems related to sharing
* the network are not possible on full-duplex networks. The conditions
* which cause the transmit error interrupt meet the requirements of the
* transmit interrupt. As a result, when this interrupt occurs, TXIF
* will also be simultaneously set.
*/
if ((eir & EIR_TXERIF) != 0) /* Transmit Error Interrupts */
{
enc_txerif(priv); /* Handle the TX error */
enc_bfcgreg(priv, ENC_EIR, EIR_TXERIF); /* Clear the TXERIF interrupt */
}
/* PKTIF The Receive Packet Pending Interrupt Flag (PKTIF) is used to
* indicate the presence of one or more data packets in the receive
* buffer and to provide a notification means for the arrival of new
* packets. When the receive buffer has at least one packet in it,
* EIR.PKTIF will be set. In other words, this interrupt flag will be
* set anytime the Ethernet Packet Count register (EPKTCNT) is non-zero.
*
* The PKTIF bit can only be cleared by the host controller or by a Reset
* condition. In order to clear PKTIF, the EPKTCNT register must be
* decremented to 0. If the last data packet in the receive buffer is
* processed, EPKTCNT will become zero and the PKTIF bit will automatically
* be cleared.
*/
/* Ignore PKTIF because is unreliable. Use EPKTCNT instead */
/* if ((eir & EIR_PKTIF) != 0) */
{
uint8_t pktcnt = enc_rdbreg(priv, ENC_EPKTCNT);
if (pktcnt > 0)
{
#ifdef CONFIG_ENC28J60_STATS
if (pktcnt > priv->stats.maxpktcnt)
{
priv->stats.maxpktcnt = pktcnt;
}
#endif
/* Handle packet receipt */
enc_pktif(priv);
}
}
/* RXERIF: The Receive Error Interrupt Flag (RXERIF) is used to
* indicate a receive buffer overflow condition. Alternately, this
* interrupt may indicate that too many packets are in the receive
* buffer and more cannot be stored without overflowing the EPKTCNT
* register. When a packet is being received and the receive buffer
* runs completely out of space, or EPKTCNT is 255 and cannot be
* incremented, the packet being received will be aborted (permanently
* lost) and the EIR.RXERIF bit will be set to 1.
*
* Once set, RXERIF can only be cleared by the host controller or by a
* Reset condition. Normally, upon the receive error condition, the
* host controller would process any packets pending from the receive
* buffer and then make additional room for future packets by
* advancing the ERXRDPT registers (low byte first) and decrementing
* the EPKTCNT register.
*
* Once processed, the host controller should use the BFC command to
* clear the EIR.RXERIF bit.
*/
if ((eir & EIR_RXERIF) != 0) /* Receive Errror Interrupts */
{
enc_rxerif(priv); /* Handle the RX error */
enc_bfcgreg(priv, ENC_EIR, EIR_RXERIF); /* Clear the RXERIF interrupt */
}
}
/* Enable Ethernet interrupts */
enc_bfsgreg(priv, ENC_EIE, EIE_INTIE);
}
/****************************************************************************
* Function: enc_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 enc_interrupt(int irq, FAR void *context)
{
register FAR struct enc_driver_s *priv = &g_enc28j60[0];
DEBUGASSERT(priv->irq == irq);
#ifdef CONFIG_SPI_OWNBUS
/* In very simple environments, we own the SPI and can do data transfers
* from the interrupt handler. That is actually a very bad idea in any
* case because it keeps interrupts disabled for a long time.
*/
enc_worker((FAR void*)priv);
return OK;
#else
/* In complex environments, we cannot do SPI transfers from the interrupt
* handler because semaphores are probably used to lock the SPI bus. In
* this case, we will defer processing to the worker thread. This is also
* much kinder in the use of system resources and is, therefore, probably
* a good thing to do in any event.
*/
return work_queue(&priv->work, enc_worker, (FAR void *)priv, 0);
#endif
}
/****************************************************************************
* Function: enc_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 enc_txtimeout(int argc, uint32_t arg, ...)
{
FAR struct enc_driver_s *priv = (FAR struct enc_driver_s *)arg;
int ret;
/* Increment statistics and dump debug info */
nlldbg("Tx timeout\n");
#ifdef CONFIG_ENC28J60_STATS
priv->stats.txtimeouts++;
#endif
/* Then reset the hardware: Take the interface down, then bring it
* back up
*/
ret = enc_ifdown(&priv->dev);
DEBUGASSERT(ret == OK);
ret = enc_ifup(&priv->dev);
DEBUGASSERT(ret == OK);
/* Then poll uIP for new XMIT data */
(void)uip_poll(&priv->dev, enc_uiptxpoll);
}
/****************************************************************************
* Function: enc_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 enc_polltimer(int argc, uint32_t arg, ...)
{
FAR struct enc_driver_s *priv = (FAR struct enc_driver_s *)arg;
/* Verify that the hardware is ready to send another packet. The driver
* start a transmission process by setting ECON1.TXRTS. When the packet is
* finished transmitting or is aborted due to an error/cancellation, the
* ECON1.TXRTS bit will be cleared.
*/
if ((enc_rdgreg(priv, ENC_ECON1) & ECON1_TXRTS) == 0)
{
/* Yes.. update TCP timing states and poll uIP for new XMIT data. Hmmm..
* looks like a bug here to me. Does this mean if there is a transmit
* in progress, we will missing TCP time state updates?
*/
(void)uip_timer(&priv->dev, enc_uiptxpoll, ENC_POLLHSEC);
}
/* Setup the watchdog poll timer again */
(void)wd_start(priv->txpoll, ENC_WDDELAY, enc_polltimer, 1, arg);
}
/****************************************************************************
* Function: enc_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 enc_ifup(struct uip_driver_s *dev)
{
FAR struct enc_driver_s *priv = (FAR struct enc_driver_s *)dev->d_private;
int ret;
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 );
/* Initialize Ethernet interface, set the MAC address, and make sure that
* the ENC28J80 is not in power save mode.
*/
ret = enc_reset(priv);
if (ret == OK)
{
enc_setmacaddr(priv);
enc_pwrfull(priv);
/* Enable interrupts at the ENC28J60. Interrupts are still disabled
* at the interrupt controller.
*/
enc_wrphy(priv, ENC_PHIE, PHIE_PGEIE | PHIE_PLNKIE);
enc_bfsgreg(priv, ENC_EIE, EIE_INTIE | EIE_PKTIE);
enc_bfsgreg(priv, ENC_EIR, EIR_DMAIF | EIR_LINKIF | EIR_TXIF |
EIR_TXERIF | EIR_RXERIF | EIR_PKTIF);
enc_wrgreg(priv, ENC_EIE, EIE_INTIE | EIE_PKTIE | EIE_LINKIE |
EIE_TXIE | EIE_TXERIE | EIE_RXERIE);
/* Enable the receiver */
enc_bfsgreg(priv, ENC_ECON1, ECON1_RXEN);
/* Set and activate a timer process */
(void)wd_start(priv->txpoll, ENC_WDDELAY, enc_polltimer, 1, (uint32_t)priv);
/* Mark the interface up and enable the Ethernet interrupt at the
* controller
*/
priv->bifup = true;
up_enable_irq(priv->irq);
}
return ret;
}
/****************************************************************************
* Function: enc_ifdown
*
* Description:
* NuttX Callback: Stop the interface.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int enc_ifdown(struct uip_driver_s *dev)
{
FAR struct enc_driver_s *priv = (FAR struct enc_driver_s *)dev->d_private;
irqstate_t flags;
int ret;
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 );
/* Disable the Ethernet interrupt */
flags = irqsave();
up_disable_irq(priv->irq);
/* Cancel the TX poll timer and TX timeout timers */
wd_cancel(priv->txpoll);
wd_cancel(priv->txtimeout);
/* Reset the device and leave in the power save state */
ret = enc_reset(priv);
enc_pwrsave(priv);
priv->bifup = false;
irqrestore(flags);
return ret;
}
/****************************************************************************
* Function: enc_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 enc_txavail(struct uip_driver_s *dev)
{
FAR struct enc_driver_s *priv = (FAR struct enc_driver_s *)dev->d_private;
irqstate_t flags;
flags = irqsave();
/* Ignore the notification if the interface is not yet up */
if (priv->bifup)
{
/* Check if the hardware is ready to send another packet. The driver
* starts a transmission process by setting ECON1.TXRTS. When the packet is
* finished transmitting or is aborted due to an error/cancellation, the
* ECON1.TXRTS bit will be cleared.
*/
if ((enc_rdgreg(priv, ENC_ECON1) & ECON1_TXRTS) == 0)
{
/* The interface is up and TX is idle; poll uIP for new XMIT data */
(void)uip_poll(&priv->dev, enc_uiptxpoll);
}
}
irqrestore(flags);
return OK;
}
/****************************************************************************
* Function: enc_pwrsave
*
* Description:
* The ENC28J60 may be commanded to power-down via the SPI interface.
* When powered down, it will no longer be able to transmit and receive
* any packets. To maximize power savings:
*
* 1. Turn off packet reception by clearing ECON1.RXEN.
* 2. Wait for any in-progress packets to finish being received by
* polling ESTAT.RXBUSY. This bit should be clear before proceeding.
* 3. Wait for any current transmissions to end by confirming ECON1.TXRTS
* is clear.
* 4. Set ECON2.VRPS (if not already set).
* 5. Enter Sleep by setting ECON2.PWRSV. All MAC, MII and PHY registers
* become inaccessible as a result. Setting PWRSV also clears
* ESTAT.CLKRDY automatically.
*
* In Sleep mode, all registers and buffer memory will maintain their
* states. The ETH registers and buffer memory will still be accessible
* by the host controller. Additionally, the clock driver will continue
* to operate. The CLKOUT function will be unaffected.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_pwrsave(FAR struct enc_driver_s *priv)
{
nllvdbg("Set PWRSV\n");
/* 1. Turn off packet reception by clearing ECON1.RXEN. */
enc_bfcgreg(priv, ENC_ECON1, ECON1_RXEN);
/* 2. Wait for any in-progress packets to finish being received by
* polling ESTAT.RXBUSY. This bit should be clear before proceeding.
*/
if (enc_waitbreg(priv, ENC_ESTAT, ESTAT_RXBUSY, 0) == OK)
{
/* 3. Wait for any current transmissions to end by confirming
* ECON1.TXRTS is clear.
*/
enc_waitbreg(priv, ENC_ECON1, ECON1_TXRTS, 0);
/* 4. Set ECON2.VRPS (if not already set). */
/* enc_bfsgreg(priv, ENC_ECON2, ECON2_VRPS); <-- Set in enc_reset() */
/* 5. Enter Sleep by setting ECON2.PWRSV. */
enc_bfsgreg(priv, ENC_ECON2, ECON2_PWRSV);
}
}
/****************************************************************************
* Function: enc_pwrfull
*
* Description:
* When normal operation is desired, the host controller must perform
* a slightly modified procedure:
*
* 1. Wake-up by clearing ECON2.PWRSV.
* 2. Wait at least 300 <20>s for the PHY to stabilize. To accomplish the
* delay, the host controller may poll ESTAT.CLKRDY and wait for it
* to become set.
* 3. Restore receive capability by setting ECON1.RXEN.
*
* After leaving Sleep mode, there is a delay of many milliseconds
* before a new link is established (assuming an appropriate link
* partner is present). The host controller may wish to wait until
* the link is established before attempting to transmit any packets.
* The link status can be determined by polling the PHSTAT2.LSTAT bit.
* Alternatively, the link change interrupt may be used if it is
* enabled.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_pwrfull(FAR struct enc_driver_s *priv)
{
nllvdbg("Clear PWRSV\n");
/* 1. Wake-up by clearing ECON2.PWRSV. */
enc_bfcgreg(priv, ENC_ECON2, ECON2_PWRSV);
/* 2. Wait at least 300 <20>s for the PHY to stabilize. To accomplish the
* delay, the host controller may poll ESTAT.CLKRDY and wait for it to
* become set.
*/
enc_waitbreg(priv, ENC_ESTAT, ESTAT_CLKRDY, ESTAT_CLKRDY);
/* 3. Restore receive capability by setting ECON1.RXEN.
*
* The caller will do this when it is read to receive packets
*/
}
/****************************************************************************
* Function: enc_setmacaddr
*
* Description:
* Set the MAC address to the configured value. This is done after ifup
* or after a TX timeout. Note that this means that the interface must
* be down before configuring the MAC addr.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void enc_setmacaddr(FAR struct enc_driver_s *priv)
{
/* Program the hardware with it's MAC address (for filtering) */
enc_wrbreg(priv, ENC_MAADR1, priv->dev.d_mac.ether_addr_octet[5]);
enc_wrbreg(priv, ENC_MAADR2, priv->dev.d_mac.ether_addr_octet[4]);
enc_wrbreg(priv, ENC_MAADR3, priv->dev.d_mac.ether_addr_octet[3]);
enc_wrbreg(priv, ENC_MAADR4, priv->dev.d_mac.ether_addr_octet[2]);
enc_wrbreg(priv, ENC_MAADR5, priv->dev.d_mac.ether_addr_octet[1]);
enc_wrbreg(priv, ENC_MAADR6, priv->dev.d_mac.ether_addr_octet[0]);
}
/****************************************************************************
* Function: enc_reset
*
* Description:
* Stop, reset, re-initialize, and restart the ENC28J60. This is done
* initially, on ifup, and after a TX timeout.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int enc_reset(FAR struct enc_driver_s *priv)
{
uint8_t regval;
nlldbg("Reset\n");
/* Configure SPI for the ENC28J60 */
enc_configspi(priv->spi);
/* Reset the ENC28J60 */
enc_wrgreg(priv, ENC_SRC, ENC_SRC);
/* Check CLKRDY bit to see when the reset is complete. There is an errata
* that says the CLKRDY may be invalid. We'll wait a couple of msec to
* workaround this condition.
*/
up_mdelay(2);
/* while ((enc_rdgreg(priv, ENC_ESTAT) & ESTAT_CLKRDY) != 0); */
/* Initialize ECON1: Clear ECON1 */
enc_wrgreg(priv, ENC_ECON1, 0x00);
/* Initialize ECON2: Enable address auto increment and voltage
* regulator powersave.
*/
enc_wrgreg(priv, ENC_ECON2, ECON2_AUTOINC | ECON2_VRPS);
/* Initialize receive buffer.
* First, set the receive buffer start address.
*/
priv->nextpkt = PKTMEM_RX_START;
enc_wrbreg(priv, ENC_ERXSTL, PKTMEM_RX_START & 0xff);
enc_wrbreg(priv, ENC_ERXSTH, PKTMEM_RX_START >> 8);
/* Set the receive data pointer */
enc_wrbreg(priv, ENC_ERXRDPTL, PKTMEM_RX_START & 0xff);
enc_wrbreg(priv, ENC_ERXRDPTH, PKTMEM_RX_START >> 8);
/* Set the receive buffer end. */
enc_wrbreg(priv, ENC_ERXNDL, PKTMEM_RX_END & 0xff);
enc_wrbreg(priv, ENC_ERXNDH, PKTMEM_RX_END >> 8);
/* Set transmit buffer start. */
enc_wrbreg(priv, ENC_ETXSTL, PKTMEM_TX_START & 0xff);
enc_wrbreg(priv, ENC_ETXSTH, PKTMEM_TX_START >> 8);
/* Check if we are actually communicating with the ENC28J60. If its
* 0x00 or 0xff, then we are probably not communicating correctly
* via SPI.
*/
regval = enc_rdbreg(priv, ENC_EREVID);
if (regval == 0x00 || regval == 0xff)
{
nlldbg("Bad Rev ID: %02x\n", regval);
return -ENODEV;
}
nllvdbg("Rev ID: %02x\n", regval);
/* Set filter mode: unicast OR broadcast AND crc valid */
enc_wrbreg(priv, ENC_ERXFCON, ERXFCON_UCEN | ERXFCON_CRCEN | ERXFCON_BCEN);
/* Enable MAC receive */
enc_wrbreg(priv, ENC_MACON1, MACON1_MARXEN | MACON1_TXPAUS | MACON1_RXPAUS);
/* Enable automatic padding and CRC operations */
#ifdef CONFIG_ENC28J60_HALFDUPLEX
enc_wrbreg(priv, ENC_MACON3, MACON3_PADCFG0 | MACON3_TXCRCEN | MACON3_FRMLNEN);
enc_wrbreg(priv, ENC_MACON4, MACON4_DEFER); /* Defer transmission enable */
/* Set Non-Back-to-Back Inter-Packet Gap */
enc_wrbreg(priv, ENC_MAIPGL, 0x12);
enc_wrbreg(priv, ENC_MAIPGH, 0x0c);
/* Set Back-to-Back Inter-Packet Gap */
enc_wrbreg(priv, ENC_MABBIPG, 0x12);
#else
/* Set filter mode: unicast OR broadcast AND crc valid AND Full Duplex */
enc_wrbreg(priv, ENC_MACON3,
MACON3_PADCFG0 | MACON3_TXCRCEN | MACON3_FRMLNEN | MACON3_FULDPX);
/* Set Non-Back-to-Back Inter-Packet Gap */
enc_wrbreg(priv, ENC_MAIPGL, 0x12);
/* Set ack-to-Back Inter-Packet Gap */
enc_wrbreg(priv, ENC_MABBIPG, 0x15);
#endif
/* Set the maximum packet size which the controller will accept */
enc_wrbreg(priv, ENC_MAMXFLL, CONFIG_NET_BUFSIZE & 0xff);
enc_wrbreg(priv, ENC_MAMXFLH, CONFIG_NET_BUFSIZE >> 8);
/* Configure LEDs (No, just use the defaults for now) */
/* enc_wrphy(priv, ENC_PHLCON, ??); */
/* Setup up PHCON1 & 2 */
#ifdef CONFIG_ENC28J60_HALFDUPLEX
enc_wrphy(priv, ENC_PHCON1, 0x00);
enc_wrphy(priv, ENC_PHCON2, PHCON2_HDLDIS);
#else
enc_wrphy(priv, ENC_PHCON1, PHCON1_PDPXMD);
enc_wrphy(priv, ENC_PHCON2, 0x00);
#endif
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: enc_initialize
*
* Description:
* Initialize the Ethernet driver. The ENC28J60 device is assumed to be
* in the post-reset state upon entry to this function.
*
* Parameters:
* spi - A reference to the platform's SPI driver for the ENC28J60
* devno - If more than one ENC28J60 is supported, then this is the
* zero based number that identifies the ENC28J60;
* irq - The fully configured GPIO IRQ that ENC28J60 interrupts will be
* asserted on. This driver will attach and entable this IRQ.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
int enc_initialize(FAR struct spi_dev_s *spi, unsigned int devno, unsigned int irq)
{
FAR struct enc_driver_s *priv ;
int ret;
DEBUGASSERT(devno < CONFIG_ENC28J60_NINTERFACES);
priv = &g_enc28j60[devno];
/* Initialize the driver structure */
memset(g_enc28j60, 0, CONFIG_ENC28J60_NINTERFACES*sizeof(struct enc_driver_s));
priv->dev.d_ifup = enc_ifup; /* I/F down callback */
priv->dev.d_ifdown = enc_ifdown; /* I/F up (new IP address) callback */
priv->dev.d_txavail = enc_txavail; /* New TX data callback */
priv->dev.d_private = priv; /* Used to recover private state from dev */
/* Create a watchdog for timing polling for and timing of transmisstions */
priv->txpoll = wd_create(); /* Create periodic poll timer */
priv->txtimeout = wd_create(); /* Create TX timeout timer */
priv->spi = spi; /* Save the SPI instance */
priv->irq = irq; /* Save the IRQ number */
/* Make sure that the interface is in the down state. NOTE: The MAC
* address will not be set up until ifup. That gives the app time to set
* the MAC address before bringing the interface up.
*/
ret = enc_ifdown(&priv->dev);
if (ret == OK)
{
/* Attach the IRQ to the driver (but don't enable it yet) */
if (irq_attach(irq, enc_interrupt))
{
/* We could not attach the ISR to the interrupt */
ret = -EAGAIN;
}
/* Register the device with the OS so that socket IOCTLs can be performed */
(void)netdev_register(&priv->dev);
}
return ret;
}
/****************************************************************************
* Function: enc_stats
*
* Description:
* Return accumulated ENC28J60 statistics. Statistics are cleared after
* being returned.
*
* Parameters:
* devno - If more than one ENC28J60 is supported, then this is the
* zero based number that identifies the ENC28J60;
* stats - The user-provided location to return the statistics.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_ENC28J60_STATS
int enc_stats(unsigned int devno, struct enc_stats_s *stats)
{
FAR struct enc_driver_s *priv ;
irqstate_t flags;
DEBUGASSERT(devno < CONFIG_ENC28J60_NINTERFACES);
priv = &g_enc28j60[devno];
/* Disable the Ethernet interrupt */
flags = irqsave();
memcpy(stats, &priv->stats, sizeof(struct enc_stats_s));
memset(&priv->stats, 0, sizeof(struct enc_stats_s));
irqrestore(flags);
return OK;
}
#endif
#endif /* CONFIG_NET && CONFIG_ENC28J60_NET */
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