b6a6c21d01
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2627 42af7a65-404d-4744-a932-0658087f49c3
721 lines
21 KiB
C
Executable File
721 lines
21 KiB
C
Executable File
/****************************************************************************
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* drivers/net/enc28j60.c
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*
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* Copyright (C) 2010 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* References:
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* - ENC28J60 Data Sheet, Stand-Alone Ethernet Controller with SPI Interface,
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* DS39662C, 2008 Microchip Technology Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#if defined(CONFIG_NET) && defined(CONFIG_ENC28J60_NET)
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#include <stdint.h>
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#include <stdbool.h>
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#include <stding.h>
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#include <time.h>
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#include <string.h>
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#include <debug.h>
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#include <wdog.h>
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#include <errno.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/spi.h>
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#include <net/uip/uip.h>
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#include <net/uip/uip-arp.h>
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#include <net/uip/uip-arch.h>
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#include "enc28j60.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* All SPI settings can be specifed in the configuration. If not, some
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* defaults will be provided.
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*
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* CONFIG_ENC28J60_OWNBUS - Set if the ENC28J60 is the only active device on
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* the SPI bus.
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* CONFIG_ENC28J60_SPIMODE - Controls the SPI mode
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* CONFIG_ENC28J60_FREQUENCY - Define to use a different bus frequency
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* CONFIG_ENC28J60_NINTERFACES - Specifies the number of physical ENC28J60
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* devices that will be supported.
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*/
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#ifdef CONFIG_ENC28J60_SPIMODE
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# define CONFIG_ENC28J60_SPIMODE SPIDEV_MODE2
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#endif
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/* CONFIG_ENC28J60_NINTERFACES determines the number of physical interfaces
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* that will be supported.
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*/
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#ifndef CONFIG_ENC28J60_NINTERFACES
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# define CONFIG_ENC28J60_NINTERFACES 1
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#endif
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/* Timing *******************************************************************/
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/* TX poll deley = 1 seconds. CLK_TCK is the number of clock ticks per second */
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#define ENC28J60_WDDELAY (1*CLK_TCK)
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#define ENC28J60_POLLHSEC (1*2)
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/* TX timeout = 1 minute */
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#define ENC28J60_TXTIMEOUT (60*CLK_TCK)
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/* Misc. Helper Macros ******************************************************/
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/* This is a helper pointer for accessing the contents of the Ethernet header */
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#define BUF ((struct uip_eth_hdr *)priv->dev.d_buf)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* The enc28j60_driver_s encapsulates all state information for a single hardware
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* interface
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*/
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struct enc28j60_driver_s
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{
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bool bifup; /* true:ifup false:ifdown */
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uint8_t bank; /* Currently selected bank */
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uint16_t nextpkt; /* Next packet address */
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WDOG_ID txpoll; /* TX poll timer */
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WDOG_ID txtimeout; /* TX timeout timer */
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/* This is the contained SPI driver intstance */
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FAR struct spi_dev_s *spi;
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/* This holds the information visible to uIP/NuttX */
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struct uip_driver_s dev; /* Interface understood by uIP */
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static struct enc28j60_driver_s g_enc28j60[CONFIG_ENC28J60_NINTERFACES];
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Low-level SPI helpers */
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static inline void enc28j60_configspi(FAR struct spi_dev_s *spi);
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/* Common TX logic */
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static int enc28j60_transmit(FAR struct enc28j60_drver_s *priv);
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static int enc28j60_uiptxpoll(struct uip_driver_s *dev);
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/* Interrupt handling */
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static void enc28j60_receive(FAR struct enc28j60_drver_s *priv);
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static void enc28j60_txdone(FAR struct enc28j60_drver_s *priv);
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static int enc28j60_interrupt(int irq, FAR void *context);
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/* Watchdog timer expirations */
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static void enc28j60_polltimer(int argc, uint32_t arg, ...);
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static void enc28j60_txtimeout(int argc, uint32_t arg, ...);
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/* NuttX callback functions */
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static int enc28j60_ifup(struct uip_driver_s *dev);
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static int enc28j60_ifdown(struct uip_driver_s *dev);
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static int enc28j60_txavail(struct uip_driver_s *dev);
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: enc28j60_configspi
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*
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* Description:
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* Configure the SPI for use with the ENC28J60
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*
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****************************************************************************/
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static inline void enc28j60_configspi(FAR struct spi_dev_s *spi)
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{
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/* Configure SPI for the ENC28J60. But only if we own the SPI bus.
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* Otherwise, don't bother because it might change.
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*/
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#ifdef CONFIG_ENC28J60_OWNBUS
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SPI_SETMODE(spi, CONFIG_ENC28J60_SPIMODE);
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SPI_SETBITS(spi, 8);
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#ifdef CONFIG_ENC28J60_FREQUENCY
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SPI_SETFREQUENCY(spi, CONFIG_ENC28J60_FREQUENCY)
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#endif
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#endif
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}
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/****************************************************************************
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* Function: enc28j60_select
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*
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* Description:
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* Select the SPI, locking and re-configuring if necessary
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*
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****************************************************************************/
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#ifdef CONFIG_ENC28J60_OWNBUS
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static inline uint8_t enc28j60_select(FAR struct spi_dev_s *spi)
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{
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/* We own the SPI bus, so just select the chip */
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SPI_SELECT(spi, SPIDEV_ETHERNET, true);
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}
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#else
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static uint8_t enc28j60_select(FAR struct spi_dev_s *spi)
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{
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/* Select ENC2J60 chip (locking the SPI bus in case there are multiple
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* devices competing for the SPI bus
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*/
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SPI_LOCK(spi, true);
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SPI_SELECT(spi, SPIDEV_ETHERNET, true);
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/* Now make sure that the SPI bus is configured for the ENC28J60 (it
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* might have gotten configured for a different device while unlocked)
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*/
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SPI_SETMODE(spi, CONFIG_ENC28J60_SPIMODE);
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SPI_SETBITS(spi, 8);
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#ifdef CONFIG_ENC28J60_FREQUENCY
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SPI_SETFREQUENCY(spi, CONFIG_ENC28J60_FREQUENCY)
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#endif
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}
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#endif
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/****************************************************************************
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* Function: enc28j60_deselect
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*
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* Description:
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* De-select the SPI
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*
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****************************************************************************/
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#ifdef CONFIG_ENC28J60_OWNBUS
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static inline uint8_t enc28j60_deselect(FAR struct spi_dev_s *spi)
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{
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/* We own the SPI bus, so just de-select the chip */
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SPI_SELECT(spi, SPIDEV_ETHERNET, false);
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}
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#else
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static uint8_t enc28j60_deselect(FAR struct spi_dev_s *spi)
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{
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/* De-select ENC28J60 chip and relinquish the SPI bus. */
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SPI_SELECT(spi, SPIDEV_ETHERNET, false);
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SPI_LOCK(spi, false);
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}
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#endif
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/****************************************************************************
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* Function: enc28j60_transmit
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*
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* Description:
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* Start hardware transmission. Called either from the txdone interrupt
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* handling or from watchdog based polling.
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*
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* Parameters:
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* priv - Reference to the driver state structure
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*
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* Returned Value:
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* OK on success; a negated errno on failure
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*
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* Assumptions:
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*
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****************************************************************************/
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static int enc28j60_transmit(FAR struct enc28j60_drver_s *priv)
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{
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/* Verify that the hardware is ready to send another packet */
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/* Increment statistics */
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/* Disable Ethernet interrupts */
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/* Send the packet: address=priv->dev.d_buf, length=priv->dev.d_len */
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/* Restore Ethernet interrupts */
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/* Setup the TX timeout watchdog (perhaps restarting the timer) */
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(void)wd_start(priv->txtimeout, ENC28J60_TXTIMEOUT, enc28j60_txtimeout, 1, (uint32_t)priv);
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return OK;
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}
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/****************************************************************************
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* Function: enc28j60_uiptxpoll
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*
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* Description:
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* The transmitter is available, check if uIP has any outgoing packets ready
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* to send. This is a callback from uip_poll(). uip_poll() may be called:
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*
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* 1. When the preceding TX packet send is complete,
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* 2. When the preceding TX packet send timesout and the interface is reset
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* 3. During normal TX polling
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*
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* Parameters:
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* dev - Reference to the NuttX driver state structure
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*
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* Returned Value:
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* OK on success; a negated errno on failure
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*
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* Assumptions:
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*
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****************************************************************************/
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static int enc28j60_uiptxpoll(struct uip_driver_s *dev)
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{
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FAR struct enc28j60_drver_s *priv = (FAR struct enc28j60_drver_s *)dev->d_private;
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/* If the polling resulted in data that should be sent out on the network,
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* the field d_len is set to a value > 0.
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*/
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if (priv->dev.d_len > 0)
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{
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uip_arp_out(&priv->dev);
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enc28j60_transmit(priv);
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/* Check if there is room in the device to hold another packet. If not,
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* return a non-zero value to terminate the poll.
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*/
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}
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/* If zero is returned, the polling will continue until all connections have
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* been examined.
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*/
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return 0;
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}
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/****************************************************************************
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* Function: enc28j60_receive
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*
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* Description:
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* An interrupt was received indicating the availability of a new RX packet
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*
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* Parameters:
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* priv - Reference to the driver state structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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static void enc28j60_receive(FAR struct enc28j60_drver_s *priv)
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{
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do
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{
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/* Check for errors and update statistics */
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/* Check if the packet is a valid size for the uIP buffer configuration */
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/* Copy the data data from the hardware to priv->dev.d_buf. Set
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* amount of data in priv->dev.d_len
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*/
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/* We only accept IP packets of the configured type and ARP packets */
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#ifdef CONFIG_NET_IPv6
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if (BUF->type == HTONS(UIP_ETHTYPE_IP6))
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#else
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if (BUF->type == HTONS(UIP_ETHTYPE_IP))
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#endif
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{
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uip_arp_ipin();
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uip_input(&priv->dev);
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/* If the above function invocation resulted in data that should be
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* sent out on the network, the field d_len will set to a value > 0.
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*/
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if (priv->dev.d_len > 0)
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{
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uip_arp_out(&priv->dev);
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enc28j60_transmit(priv);
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}
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}
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else if (BUF->type == htons(UIP_ETHTYPE_ARP))
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{
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uip_arp_arpin(&priv->dev);
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/* If the above function invocation resulted in data that should be
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* sent out on the network, the field d_len will set to a value > 0.
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*/
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if (priv->dev.d_len > 0)
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{
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enc28j60_transmit(priv);
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}
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}
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}
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}
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while (); /* While there are more packets to be processed */
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}
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/****************************************************************************
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* Function: enc28j60_txdone
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*
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* Description:
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* An interrupt was received indicating that the last TX packet(s) is done
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*
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* Parameters:
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* priv - Reference to the driver state structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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static void enc28j60_txdone(FAR struct enc28j60_drver_s *priv)
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{
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/* Check for errors and update statistics */
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/* If no further xmits are pending, then cancel the TX timeout */
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wd_cancel(priv->txtimeout);
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/* Then poll uIP for new XMIT data */
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(void)uip_poll(&priv->dev, enc28j60_uiptxpoll);
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}
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/****************************************************************************
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* Function: enc28j60_interrupt
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*
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* Description:
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* Hardware interrupt handler
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*
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* Parameters:
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* irq - Number of the IRQ that generated the interrupt
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* context - Interrupt register state save info (architecture-specific)
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*
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* Returned Value:
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* OK on success
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*
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* Assumptions:
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*
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****************************************************************************/
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static int enc28j60_interrupt(int irq, FAR void *context)
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{
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register FAR struct enc28j60_drver_s *priv = &g_enc28j60[0];
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/* Disable Ethernet interrupts */
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/* Get and clear interrupt status bits */
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/* Handle interrupts according to status bit settings */
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/* Check if we received an incoming packet, if so, call enc28j60_receive() */
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enc28j60_receive(priv);
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/* Check is a packet transmission just completed. If so, call enc28j60_txdone */
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enc28j60_txdone(priv);
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/* Enable Ethernet interrupts (perhaps excluding the TX done interrupt if
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* there are no pending transmissions.
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*/
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return OK;
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}
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/****************************************************************************
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* Function: enc28j60_txtimeout
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*
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* Description:
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* Our TX watchdog timed out. Called from the timer interrupt handler.
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* The last TX never completed. Reset the hardware and start again.
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*
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* Parameters:
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* argc - The number of available arguments
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* arg - The first argument
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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static void enc28j60_txtimeout(int argc, uint32_t arg, ...)
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{
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FAR struct enc28j60_drver_s *priv = (FAR struct enc28j60_drver_s *)arg;
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/* Increment statistics and dump debug info */
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/* Then reset the hardware */
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/* Then poll uIP for new XMIT data */
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(void)uip_poll(&priv->dev, enc28j60_uiptxpoll);
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}
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/****************************************************************************
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* Function: enc28j60_polltimer
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*
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* Description:
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* Periodic timer handler. Called from the timer interrupt handler.
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*
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* Parameters:
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* argc - The number of available arguments
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* arg - The first argument
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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static void enc28j60_polltimer(int argc, uint32_t arg, ...)
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{
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FAR struct enc28j60_drver_s *priv = (FAR struct enc28j60_drver_s *)arg;
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/* Check if there is room in the send another TXr packet. */
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/* If so, update TCP timing states and poll uIP for new XMIT data */
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(void)uip_timer(&priv->dev, enc28j60_uiptxpoll, ENC28J60_POLLHSEC);
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/* Setup the watchdog poll timer again */
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(void)wd_start(priv->txpoll, ENC28J60_WDDELAY, enc28j60_polltimer, 1, arg);
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}
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/****************************************************************************
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* Function: enc28j60_ifup
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*
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* Description:
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* NuttX Callback: Bring up the Ethernet interface when an IP address is
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* provided
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*
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* Parameters:
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* dev - Reference to the NuttX driver state structure
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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static int enc28j60_ifup(struct uip_driver_s *dev)
|
|
{
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|
FAR struct enc28j60_drver_s *priv = (FAR struct enc28j60_drver_s *)dev->d_private;
|
|
|
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ndbg("Bringing up: %d.%d.%d.%d\n",
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dev->d_ipaddr & 0xff, (dev->d_ipaddr >> 8) & 0xff,
|
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(dev->d_ipaddr >> 16) & 0xff, dev->d_ipaddr >> 24 );
|
|
|
|
/* Initilize Ethernet interface */
|
|
|
|
/* Set and activate a timer process */
|
|
|
|
(void)wd_start(priv->txpoll, ENC28J60_WDDELAY, enc28j60_polltimer, 1, (uint32_t)priv);
|
|
|
|
/* Enable the Ethernet interrupt */
|
|
|
|
priv->bifup = true;
|
|
up_enable_irq(CONFIG_ENC28J60_IRQ);
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Function: enc28j60_ifdown
|
|
*
|
|
* Description:
|
|
* NuttX Callback: Stop the interface.
|
|
*
|
|
* Parameters:
|
|
* dev - Reference to the NuttX driver state structure
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int enc28j60_ifdown(struct uip_driver_s *dev)
|
|
{
|
|
FAR struct enc28j60_drver_s *priv = (FAR struct enc28j60_drver_s *)dev->d_private;
|
|
irqstate_t flags;
|
|
|
|
/* Disable the Ethernet interrupt */
|
|
|
|
flags = irqsave();
|
|
up_disable_irq(CONFIG_ENC28J60_IRQ);
|
|
|
|
/* Cancel the TX poll timer and TX timeout timers */
|
|
|
|
wd_cancel(priv->txpoll);
|
|
wd_cancel(priv->txtimeout);
|
|
|
|
/* Reset the device */
|
|
|
|
priv->bifup = false;
|
|
irqrestore(flags);
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Function: enc28j60_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 enc28j60_txavail(struct uip_driver_s *dev)
|
|
{
|
|
FAR struct enc28j60_drver_s *priv = (FAR struct enc28j60_drver_s *)dev->d_private;
|
|
irqstate_t flags;
|
|
|
|
flags = irqsave();
|
|
|
|
/* Ignore the notification if the interface is not yet up */
|
|
|
|
if (priv->bifup)
|
|
{
|
|
|
|
/* Check if there is room in the hardware to hold another outgoing packet. */
|
|
|
|
/* If so, then poll uIP for new XMIT data */
|
|
|
|
(void)uip_poll(&priv->dev, enc28j60_uiptxpoll);
|
|
}
|
|
|
|
irqrestore(flags);
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: enc28j60_initialize
|
|
*
|
|
* Description:
|
|
* Initialize the Ethernet driver
|
|
*
|
|
* Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* OK on success; Negated errno on failure.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
/* Initialize the Ethernet controller and driver */
|
|
|
|
int enc28j60_initialize(FAR struct spi_dev_s *spi)
|
|
{
|
|
/* Initialize and configure the ENC28J60 */
|
|
|
|
/* Initialize the driver structure */
|
|
|
|
memset(g_enc28j60, 0, CONFIG_ENC28J60_NINTERFACES*sizeof(struct enc28j60_driver_s));
|
|
g_enc28j60[0].dev.d_ifup = enc28j60_ifup; /* I/F down callback */
|
|
g_enc28j60[0].dev.d_ifdown = enc28j60_ifdown; /* I/F up (new IP address) callback */
|
|
g_enc28j60[0].dev.d_txavail = enc28j60_txavail; /* New TX data callback */
|
|
g_enc28j60[0].dev.d_private = (void*)g_enc28j60; /* Used to recover private state from dev */
|
|
|
|
/* Create a watchdog for timing polling for and timing of transmisstions */
|
|
|
|
g_enc28j60[0].txpoll = wd_create(); /* Create periodic poll timer */
|
|
g_enc28j60[0].txtimeout = wd_create(); /* Create TX timeout timer */
|
|
g_enc28j60[0].spi = spi; /* Save the SPI instance */
|
|
|
|
/* Attach the IRQ to the driver */
|
|
|
|
if (irq_attach(CONFIG_ENC28J60_IRQ, enc28j60_interrupt))
|
|
{
|
|
/* We could not attach the ISR to the interrupt */
|
|
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* Read the MAC address from the hardware into g_enc28j60[0].dev.d_mac.ether_addr_octet */
|
|
|
|
/* Register the device with the OS so that socket IOCTLs can be performed */
|
|
|
|
(void)netdev_register(&g_enc28j60[0].dev);
|
|
return OK;
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_ENC28J60_NET */
|
|
|