lmc_media.c

hdlc wan 驱动程序

/* $Id: lmc_media.c,v 1.13 2000/04/11 05:25:26 asj Exp $ */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/inet.h>

#include <net/syncppp.h>

#include <asm/processor.h>             /* Processor type for cache alignment. */
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>

#include <asm/uaccess.h>

#include "lmc.h"
#include "lmc_var.h"
#include "lmc_ioctl.h"
#include "lmc_debug.h"

#define CONFIG_LMC_IGNORE_HARDWARE_HANDSHAKE 1

 /*
  * Copyright (c) 1997-2000 LAN Media Corporation (LMC)
  * All rights reserved.  www.lanmedia.com
  *
  * This code is written by:
  * Andrew Stanley-Jones ([e-mail])
  * Rob Braun ([e-mail]),
  * Michael Graff ([e-mail]) and
  * Matt Thomas ([e-mail]).
  *
  * This software may be used and distributed according to the terms
  * of the GNU General Public License version 2, incorporated herein by reference.
  */

/*
 * For lack of a better place, put the SSI cable stuff here.
 */
char *lmc_t1_cables[] = {
  "V.10/RS423", "EIA530A", "reserved", "X.21", "V.35",
  "EIA449/EIA530/V.36", "V.28/EIA232", "none", NULL
};

/*
 * protocol independent method.
 */
static void lmc_set_protocol (lmc_softc_t * const, lmc_ctl_t *);

/*
 * media independent methods to check on media status, link, light LEDs,
 * etc.
 */
static void lmc_ds3_init (lmc_softc_t * const);
static void lmc_ds3_default (lmc_softc_t * const);
static void lmc_ds3_set_status (lmc_softc_t * const, lmc_ctl_t *);
static void lmc_ds3_set_100ft (lmc_softc_t * const, int);
static int lmc_ds3_get_link_status (lmc_softc_t * const);
static void lmc_ds3_set_crc_length (lmc_softc_t * const, int);
static void lmc_ds3_set_scram (lmc_softc_t * const, int);
static void lmc_ds3_watchdog (lmc_softc_t * const);

static void lmc_hssi_init (lmc_softc_t * const);
static void lmc_hssi_default (lmc_softc_t * const);
static void lmc_hssi_set_status (lmc_softc_t * const, lmc_ctl_t *);
static void lmc_hssi_set_clock (lmc_softc_t * const, int);
static int lmc_hssi_get_link_status (lmc_softc_t * const);
static void lmc_hssi_set_link_status (lmc_softc_t * const, int);
static void lmc_hssi_set_crc_length (lmc_softc_t * const, int);
static void lmc_hssi_watchdog (lmc_softc_t * const);

static void lmc_ssi_init (lmc_softc_t * const);
static void lmc_ssi_default (lmc_softc_t * const);
static void lmc_ssi_set_status (lmc_softc_t * const, lmc_ctl_t *);
static void lmc_ssi_set_clock (lmc_softc_t * const, int);
static void lmc_ssi_set_speed (lmc_softc_t * const, lmc_ctl_t *);
static int lmc_ssi_get_link_status (lmc_softc_t * const);
static void lmc_ssi_set_link_status (lmc_softc_t * const, int);
static void lmc_ssi_set_crc_length (lmc_softc_t * const, int);
static void lmc_ssi_watchdog (lmc_softc_t * const);

static void lmc_t1_init (lmc_softc_t * const);
static void lmc_t1_default (lmc_softc_t * const);
static void lmc_t1_set_status (lmc_softc_t * const, lmc_ctl_t *);
static int lmc_t1_get_link_status (lmc_softc_t * const);
static void lmc_t1_set_circuit_type (lmc_softc_t * const, int);
static void lmc_t1_set_crc_length (lmc_softc_t * const, int);
static void lmc_t1_set_clock (lmc_softc_t * const, int);
static void lmc_t1_watchdog (lmc_softc_t * const);

static void lmc_dummy_set_1 (lmc_softc_t * const, int);
static void lmc_dummy_set2_1 (lmc_softc_t * const, lmc_ctl_t *);

static inline void write_av9110_bit (lmc_softc_t *, int);
static void write_av9110 (lmc_softc_t *, u_int32_t, u_int32_t, u_int32_t,
			  u_int32_t, u_int32_t);

lmc_media_t lmc_ds3_media = {
  lmc_ds3_init,			/* special media init stuff */
  lmc_ds3_default,		/* reset to default state */
  lmc_ds3_set_status,		/* reset status to state provided */
  lmc_dummy_set_1,		/* set clock source */
  lmc_dummy_set2_1,		/* set line speed */
  lmc_ds3_set_100ft,		/* set cable length */
  lmc_ds3_set_scram,		/* set scrambler */
  lmc_ds3_get_link_status,	/* get link status */
  lmc_dummy_set_1,		/* set link status */
  lmc_ds3_set_crc_length,	/* set CRC length */
  lmc_dummy_set_1,		/* set T1 or E1 circuit type */
  lmc_ds3_watchdog
};

lmc_media_t lmc_hssi_media = {
  lmc_hssi_init,		/* special media init stuff */
  lmc_hssi_default,		/* reset to default state */
  lmc_hssi_set_status,		/* reset status to state provided */
  lmc_hssi_set_clock,		/* set clock source */
  lmc_dummy_set2_1,		/* set line speed */
  lmc_dummy_set_1,		/* set cable length */
  lmc_dummy_set_1,		/* set scrambler */
  lmc_hssi_get_link_status,	/* get link status */
  lmc_hssi_set_link_status,	/* set link status */
  lmc_hssi_set_crc_length,	/* set CRC length */
  lmc_dummy_set_1,		/* set T1 or E1 circuit type */
  lmc_hssi_watchdog
};

lmc_media_t lmc_ssi_media = { lmc_ssi_init,	/* special media init stuff */
  lmc_ssi_default,		/* reset to default state */
  lmc_ssi_set_status,		/* reset status to state provided */
  lmc_ssi_set_clock,		/* set clock source */
  lmc_ssi_set_speed,		/* set line speed */
  lmc_dummy_set_1,		/* set cable length */
  lmc_dummy_set_1,		/* set scrambler */
  lmc_ssi_get_link_status,	/* get link status */
  lmc_ssi_set_link_status,	/* set link status */
  lmc_ssi_set_crc_length,	/* set CRC length */
  lmc_dummy_set_1,		/* set T1 or E1 circuit type */
  lmc_ssi_watchdog
};

lmc_media_t lmc_t1_media = {
  lmc_t1_init,			/* special media init stuff */
  lmc_t1_default,		/* reset to default state */
  lmc_t1_set_status,		/* reset status to state provided */
  lmc_t1_set_clock,		/* set clock source */
  lmc_dummy_set2_1,		/* set line speed */
  lmc_dummy_set_1,		/* set cable length */
  lmc_dummy_set_1,		/* set scrambler */
  lmc_t1_get_link_status,	/* get link status */
  lmc_dummy_set_1,		/* set link status */
  lmc_t1_set_crc_length,	/* set CRC length */
  lmc_t1_set_circuit_type,	/* set T1 or E1 circuit type */
  lmc_t1_watchdog
};

static void
lmc_dummy_set_1 (lmc_softc_t * const sc, int a)
{
}

static void
lmc_dummy_set2_1 (lmc_softc_t * const sc, lmc_ctl_t * a)
{
}

/*
 *  HSSI methods
 */

static void
lmc_hssi_init (lmc_softc_t * const sc)
{
  sc->ictl.cardtype = LMC_CTL_CARDTYPE_LMC5200;

  lmc_gpio_mkoutput (sc, LMC_GEP_HSSI_CLOCK);
}

static void
lmc_hssi_default (lmc_softc_t * const sc)
{
  sc->lmc_miireg16 = LMC_MII16_LED_ALL;

  sc->lmc_media->set_link_status (sc, LMC_LINK_DOWN);
  sc->lmc_media->set_clock_source (sc, LMC_CTL_CLOCK_SOURCE_EXT);
  sc->lmc_media->set_crc_length (sc, LMC_CTL_CRC_LENGTH_16);
}

/*
 * Given a user provided state, set ourselves up to match it.  This will
 * always reset the card if needed.
 */
static void
lmc_hssi_set_status (lmc_softc_t * const sc, lmc_ctl_t * ctl)
{
  if (ctl == NULL)
    {
      sc->lmc_media->set_clock_source (sc, sc->ictl.clock_source);
      lmc_set_protocol (sc, NULL);

      return;
    }

  /*
   * check for change in clock source
   */
  if (ctl->clock_source && !sc->ictl.clock_source)
    {
      sc->lmc_media->set_clock_source (sc, LMC_CTL_CLOCK_SOURCE_INT);
      sc->lmc_timing = LMC_CTL_CLOCK_SOURCE_INT;
    }
  else if (!ctl->clock_source && sc->ictl.clock_source)
    {
      sc->lmc_timing = LMC_CTL_CLOCK_SOURCE_EXT;
      sc->lmc_media->set_clock_source (sc, LMC_CTL_CLOCK_SOURCE_EXT);
    }

  lmc_set_protocol (sc, ctl);
}

/*
 * 1 == internal, 0 == external
 */
static void
lmc_hssi_set_clock (lmc_softc_t * const sc, int ie)
{
  int old;
  old = sc->ictl.clock_source;
  if (ie == LMC_CTL_CLOCK_SOURCE_EXT)
    {
      sc->lmc_gpio |= LMC_GEP_HSSI_CLOCK;
      LMC_CSR_WRITE (sc, csr_gp, sc->lmc_gpio);
      sc->ictl.clock_source = LMC_CTL_CLOCK_SOURCE_EXT;
      if(old != ie)
        printk (LMC_PRINTF_FMT ": clock external\n", LMC_PRINTF_ARGS);
    }
  else
    {
      sc->lmc_gpio &= ~(LMC_GEP_HSSI_CLOCK);
      LMC_CSR_WRITE (sc, csr_gp, sc->lmc_gpio);
      sc->ictl.clock_source = LMC_CTL_CLOCK_SOURCE_INT;
      if(old != ie)
        printk (LMC_PRINTF_FMT ": clock internal\n", LMC_PRINTF_ARGS);
    }
}

/*
 * return hardware link status.
 * 0 == link is down, 1 == link is up.
 */
static int
lmc_hssi_get_link_status (lmc_softc_t * const sc)
{
    /*
     * We're using the same code as SSI since
     * they're practically the same
     */
    return lmc_ssi_get_link_status(sc);
}

static void
lmc_hssi_set_link_status (lmc_softc_t * const sc, int state)
{
  if (state == LMC_LINK_UP)
    sc->lmc_miireg16 |= LMC_MII16_HSSI_TA;
  else
    sc->lmc_miireg16 &= ~LMC_MII16_HSSI_TA;

  lmc_mii_writereg (sc, 0, 16, sc->lmc_miireg16);
}

/*
 * 0 == 16bit, 1 == 32bit
 */
static void
lmc_hssi_set_crc_length (lmc_softc_t * const sc, int state)
{
  if (state == LMC_CTL_CRC_LENGTH_32)
    {
      /* 32 bit */
      sc->lmc_miireg16 |= LMC_MII16_HSSI_CRC;
      sc->ictl.crc_length = LMC_CTL_CRC_LENGTH_32;
    }
  else
    {
      /* 16 bit */
      sc->lmc_miireg16 &= ~LMC_MII16_HSSI_CRC;
      sc->ictl.crc_length = LMC_CTL_CRC_LENGTH_16;
    }

  lmc_mii_writereg (sc, 0, 16, sc->lmc_miireg16);
}

static void
lmc_hssi_watchdog (lmc_softc_t * const sc)
{
  /* HSSI is blank */
}

/*
 *  DS3 methods
 */

/*
 * Set cable length
 */
static void
lmc_ds3_set_100ft (lmc_softc_t * const sc, int ie)
{
  if (ie == LMC_CTL_CABLE_LENGTH_GT_100FT)
    {
      sc->lmc_miireg16 &= ~LMC_MII16_DS3_ZERO;
      sc->ictl.cable_length = LMC_CTL_CABLE_LENGTH_GT_100FT;
    }
  else if (ie == LMC_CTL_CABLE_LENGTH_LT_100FT)
    {
      sc->lmc_miireg16 |= LMC_MII16_DS3_ZERO;
      sc->ictl.cable_length = LMC_CTL_CABLE_LENGTH_LT_100FT;
    }
  lmc_mii_writereg (sc, 0, 16, sc->lmc_miireg16);
}

static void
lmc_ds3_default (lmc_softc_t * const sc)
{
  sc->lmc_miireg16 = LMC_MII16_LED_ALL;

  sc->lmc_media->set_link_status (sc, LMC_LINK_DOWN);
  sc->lmc_media->set_cable_length (sc, LMC_CTL_CABLE_LENGTH_LT_100FT);
  sc->lmc_media->set_scrambler (sc, LMC_CTL_OFF);
  sc->lmc_media->set_crc_length (sc, LMC_CTL_CRC_LENGTH_16);
}

/*
 * Given a user provided state, set ourselves up to match it.  This will
 * always reset the card if needed.
 */
static void
lmc_ds3_set_status (lmc_softc_t * const sc, lmc_ctl_t * ctl)
{
  if (ctl == NULL)
    {
      sc->lmc_media->set_cable_length (sc, sc->ictl.cable_length);
      sc->lmc_media->set_scrambler (sc, sc->ictl.scrambler_onoff);
      lmc_set_protocol (sc, NULL);

      return;
    }

  /*
   * check for change in cable length setting
   */
  if (ctl->cable_length && !sc->ictl.cable_length)
    lmc_ds3_set_100ft (sc, LMC_CTL_CABLE_LENGTH_GT_100FT);
  else if (!ctl->cable_length && sc->ictl.cable_length)
    lmc_ds3_set_100ft (sc, LMC_CTL_CABLE_LENGTH_LT_100FT);

  /*
   * Check for change in scrambler setting (requires reset)
   */
  if (ctl->scrambler_onoff && !sc->ictl.scrambler_onoff)
    lmc_ds3_set_scram (sc, LMC_CTL_ON);
  else if (!ctl->scrambler_onoff && sc->ictl.scrambler_onoff)
    lmc_ds3_set_scram (sc, LMC_CTL_OFF);

  lmc_set_protocol (sc, ctl);
}

static void
lmc_ds3_init (lmc_softc_t * const sc)
{
  int i;

  sc->ictl.cardtype = LMC_CTL_CARDTYPE_LMC5245;

  /* writes zeros everywhere */
  for (i = 0; i < 21; i++)
    {
      lmc_mii_writereg (sc, 0, 17, i);
      lmc_mii_writereg (sc, 0, 18, 0);
    }

  /* set some essential bits */
  lmc_mii_writereg (sc, 0, 17, 1);
  lmc_mii_writereg (sc, 0, 18, 0x25);	/* ser, xtx */

  lmc_mii_writereg (sc, 0, 17, 5);
  lmc_mii_writereg (sc, 0, 18, 0x80);	/* emode */

  lmc_mii_writereg (sc, 0, 17, 14);
  lmc_mii_writereg (sc, 0, 18, 0x30);	/* rcgen, tcgen */

  /* clear counters and latched bits */
  for (i = 0; i < 21; i++)
    {
      lmc_mii_writereg (sc, 0, 17, i);
      lmc_mii_readreg (sc, 0, 18);
    }
}

/*
 * 1 == DS3 payload scrambled, 0 == not scrambled
 */