path: root/drivers/net/wan/lmc/lmc_media.c

// SPDX-License-Identifier: GPL-2.0-only
/* $Id: lmc_media.c,v 1.13 2000/04/11 05:25:26 asj Exp $ */

#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/interrupt.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 <linux/bitops.h>

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

#include <linux/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 (asj@cban.com)
  * Rob Braun (bbraun@vix.com),
  * Michael Graff (explorer@vix.com) and
  * Matt Thomas (matt@3am-software.com).
  */

/*
 * 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 *, u32, u32, u32, u32, u32);

lmc_media_t lmc_ds3_media = {
  .init = lmc_ds3_init,				/* special media init stuff */
  .defaults = lmc_ds3_default,			/* reset to default state */
  .set_status = lmc_ds3_set_status,		/* reset status to state provided */
  .set_clock_source = lmc_dummy_set_1,		/* set clock source */
  .set_speed = lmc_dummy_set2_1,		/* set line speed */
  .set_cable_length = lmc_ds3_set_100ft,	/* set cable length */
  .set_scrambler = lmc_ds3_set_scram,		/* set scrambler */
  .get_link_status = lmc_ds3_get_link_status,	/* get link status */
  .set_link_status = lmc_dummy_set_1,		/* set link status */
  .set_crc_length = lmc_ds3_set_crc_length,	/* set CRC length */
  .set_circuit_type = lmc_dummy_set_1,		/* set T1 or E1 circuit type */
  .watchdog = lmc_ds3_watchdog
};

lmc_media_t lmc_hssi_media = {
  .init = lmc_hssi_init,			/* special media init stuff */
  .defaults = lmc_hssi_default,			/* reset to default state */
  .set_status = lmc_hssi_set_status,		/* reset status to state provided */
  .set_clock_source = lmc_hssi_set_clock,	/* set clock source */
  .set_speed = lmc_dummy_set2_1,		/* set line speed */
  .set_cable_length = lmc_dummy_set_1,		/* set cable length */
  .set_scrambler = lmc_dummy_set_1,		/* set scrambler */
  .get_link_status = lmc_hssi_get_link_status,	/* get link status */
  .set_link_status = lmc_hssi_set_link_status,	/* set link status */
  .set_crc_length = lmc_hssi_set_crc_length,	/* set CRC length */
  .set_circuit_type = lmc_dummy_set_1,		/* set T1 or E1 circuit type */
  .watchdog = lmc_hssi_watchdog
};

lmc_media_t lmc_ssi_media = {
  .init = lmc_ssi_init,				/* special media init stuff */
  .defaults = lmc_ssi_default,			/* reset to default state */
  .set_status = lmc_ssi_set_status,		/* reset status to state provided */
  .set_clock_source = lmc_ssi_set_clock,	/* set clock source */
  .set_speed = lmc_ssi_set_speed,		/* set line speed */
  .set_cable_length = lmc_dummy_set_1,		/* set cable length */
  .set_scrambler = lmc_dummy_set_1,		/* set scrambler */
  .get_link_status = lmc_ssi_get_link_status,	/* get link status */
  .set_link_status = lmc_ssi_set_link_status,	/* set link status */
  .set_crc_length = lmc_ssi_set_crc_length,	/* set CRC length */
  .set_circuit_type = lmc_dummy_set_1,		/* set T1 or E1 circuit type */
  .watchdog = lmc_ssi_watchdog
};

lmc_media_t lmc_t1_media = {
  .init = lmc_t1_init,				/* special media init stuff */
  .defaults = lmc_t1_default,			/* reset to default state */
  .set_status = lmc_t1_set_status,		/* reset status to state provided */
  .set_clock_source = lmc_t1_set_clock,		/* set clock source */
  .set_speed = lmc_dummy_set2_1,		/* set line speed */
  .set_cable_length = lmc_dummy_set_1,		/* set cable length */
  .set_scrambler = lmc_dummy_set_1,		/* set scrambler */
  .get_link_status = lmc_t1_get_link_status,	/* get link status */
  .set_link_status = lmc_dummy_set_1,		/* set link status */
  .set_crc_length = lmc_t1_set_crc_length,	/* set CRC length */
  .set_circuit_type = lmc_t1_set_circuit_type,	/* set T1 or E1 circuit type */
  .watchdog = 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
 */
static void
lmc_ds3_set_scram (lmc_softc_t * const sc, int ie)
{
  if (ie == LMC_CTL_ON)
    {
      sc->lmc_miireg16 |= LMC_MII16_DS3_SCRAM;
      sc->ictl.scrambler_onoff = LMC_CTL_ON;
    }
  else
    {
      sc->lmc_miireg16 &= ~LMC_MII16_DS3_SCRAM;
      sc->ictl.scrambler_onoff = LMC_CTL_OFF;
    }
  lmc_mii_writereg (sc, 0, 16, sc->lmc_miireg16);
}

/*
 * return hardware link status.
 * 0 == link is down, 1 == link is up.
 */
static int
lmc_ds3_get_link_status (lmc_softc_t * const sc)
{
    u16 link_status, link_status_11;
    int ret = 1;

    lmc_mii_writereg (sc, 0, 17, 7);
    link_status = lmc_mii_readreg (sc, 0, 18);

    /* LMC5245 (DS3) & LMC1200 (DS1) LED definitions
     * led0 yellow = far-end adapter is in Red alarm condition
     * led1 blue   = received an Alarm Indication signal
     *               (upstream failure)
     * led2 Green  = power to adapter, Gate Array loaded & driver
     *               attached
     * led3 red    = Loss of Signal (LOS) or out of frame (OOF)
     *               conditions detected on T3 receive signal
     */

    lmc_led_on(sc, LMC_DS3_LED2);

    if ((link_status & LMC_FRAMER_REG0_DLOS) ||
        (link_status & LMC_FRAMER_REG0_OOFS)){
        ret = 0;
        if(sc->last_led_err[3] != 1){
	    u16 r1;
            lmc_mii_writereg (sc, 0, 17, 01); /* Turn on Xbit error as our cisco does */
            r1 = lmc_mii_readreg (sc, 0, 18);
            r1 &= 0xfe;
            lmc_mii_writereg(sc, 0, 18, r1);
            printk(KERN_WARNING "%s: Red Alarm - Loss of Signal or Loss of Framing\n", sc->name);
        }
        lmc_led_on(sc, LMC_DS3_LED3);	/* turn on red LED */
        sc->last_led_err[3] = 1;
    }
    else {
        lmc_led_off(sc, LMC_DS3_LED3);	/* turn on red LED */
        if(sc->last_led_err[3] == 1){
	    u16 r1;
            lmc_mii_writereg (sc, 0, 17, 01); /* Turn off Xbit error */
            r1 = lmc_mii_readreg (sc, 0, 18);
            r1 |= 0x01;
            lmc_mii_writereg(sc, 0, 18, r1);
        }
        sc->last_led_err[3] = 0;
    }

    lmc_mii_writereg(sc, 0, 17, 0x10);
    link_status_11 = lmc_mii_readreg(sc, 0, 18);
    if((link_status & LMC_FRAMER_REG0_AIS) ||
       (link_status_11 & LMC_FRAMER_REG10_XBIT)) {
        ret = 0;
        if(sc->last_led_err[0] != 1){
            printk(KERN_WARNING "%s: AIS Alarm or XBit Error\n", sc->name);
            printk(KERN_WARNING "%s: Remote end has loss of signal or framing\n", sc->name);
        }
        lmc_led_on(sc, LMC_DS3_LED0);
        sc->last_led_err[0] = 1;
    }
    else {
        lmc_led_off(sc, LMC_DS3_LED0);
        sc->last_led_err[0] = 0;
    }

    lmc_mii_writereg (sc, 0, 17, 9);
    link_status = lmc_mii_readreg (sc, 0, 18);
    
    if(link_status & LMC_FRAMER_REG9_RBLUE){
        ret = 0;
        if(sc->last_led_err[1] != 1){
            printk(KERN_WARNING "%s: Blue Alarm - Receiving all 1's\n", sc->name);
        }
        lmc_led_on(sc, LMC_DS3_LED1);
        sc->last_led_err[1] = 1;
    }
    else {
        lmc_led_off(sc, LMC_DS3_LED1);
        sc->last_led_err[1] = 0;
    }

    return ret;
}

/*
 * 0 == 16bit, 1 == 32bit
 */
static void
lmc_ds3_set_crc_length (lmc_softc_t * const sc, int state)
{
  if (state == LMC_CTL_CRC_LENGTH_32)
    {
      /* 32 bit */
      sc->lmc_miireg16 |= LMC_MII16_DS3_CRC;
      sc->ictl.crc_length = LMC_CTL_CRC_LENGTH_32;
    }
  else
    {
      /* 16 bit */
      sc->lmc_miireg16 &= ~LMC_MII16_DS3_CRC;
      sc->ictl.crc_length = LMC_CTL_CRC_LENGTH_16;
    }

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

static void
lmc_ds3_watchdog (lmc_softc_t * const sc)
{
    
}


/*
 *  SSI methods
 */

static void lmc_ssi_init(lmc_softc_t * const sc)
{
	u16 mii17;
	int cable;

	sc->ictl.cardtype = LMC_CTL_CARDTYPE_LMC1000;

	mii17 = lmc_mii_readreg(sc, 0, 17);

	cable = (mii17 & LMC_MII17_SSI_CABLE_MASK) >> LMC_MII17_SSI_CABLE_SHIFT;
	sc->ictl.cable_type = cable;

	lmc_gpio_mkoutput(sc, LMC_GEP_SSI_TXCLOCK);
}

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

  /*
   * make TXCLOCK always be an output
   */
  lmc_gpio_mkoutput (sc, LMC_GEP_SSI_TXCLOCK);

  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_speed (sc, NULL);
  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_ssi_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);
      sc->lmc_media->set_speed (sc, &sc->ictl);
      lmc_set_protocol (sc, NULL);

      return;
    }

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

  if (ctl->clock_rate != sc->ictl.clock_rate)
    sc->lmc_media->set_speed (sc, ctl);

  lmc_set_protocol (sc, ctl);
}

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

static void
lmc_ssi_set_speed (lmc_softc_t * const sc, lmc_ctl_t * ctl)
{
  lmc_ctl_t *ictl = &sc->ictl;
  lmc_av9110_t *av;

  /* original settings for clock rate of:
   *  100 Khz (8,25,0,0,2) were incorrect
   *  they should have been 80,125,1,3,3
   *  There are 17 param combinations to produce this freq.
   *  For 1.5 Mhz use 120,100,1,1,2 (226 param. combinations)
   */
  if (ctl == NULL)
    {
      av = &ictl->cardspec.ssi;
      ictl->clock_rate = 1500000;
      av->f = ictl->clock_rate;
      av->n = 120;
      av->m = 100;
      av->v = 1;
      av->x = 1;
      av->r = 2;

      write_av9110 (sc, av->n, av->m, av->v, av->x, av->r);
      return;
    }

  av = &ctl->cardspec.ssi;

  if (av->f == 0)
    return;

  ictl->clock_rate = av->f;	/* really, this is the rate we are */
  ictl->cardspec.ssi = *av;

  write_av9110 (sc, av->n, av->m, av->v, av->x, av->r);
}

/*
 * return hardware link status.
 * 0 == link is down, 1 == link is up.
 */
static int
lmc_ssi_get_link_status (lmc_softc_t * const sc)
{
  u16 link_status;
  u32 ticks;
  int ret = 1;
  int hw_hdsk = 1;

  /*
   * missing CTS?  Hmm.  If we require CTS on, we may never get the
   * link to come up, so omit it in this test.
   *
   * Also, it seems that with a loopback cable, DCD isn't asserted,
   * so just check for things like this:
   *      DSR _must_ be asserted.
   *      One of DCD or CTS must be asserted.
   */

  /* LMC 1000 (SSI) LED definitions
   * led0 Green = power to adapter, Gate Array loaded &
   *              driver attached
   * led1 Green = DSR and DTR and RTS and CTS are set
   * led2 Green = Cable detected
   * led3 red   = No timing is available from the
   *              cable or the on-board frequency
   *              generator.
   */

  link_status = lmc_mii_readreg (sc, 0, 16);

  /* Is the transmit clock still available */
  ticks = LMC_CSR_READ (sc, csr_gp_timer);
  ticks = 0x0000ffff - (ticks & 0x0000ffff);

  lmc_led_on (sc, LMC_MII16_LED0);

  /* ====== transmit clock determination ===== */
  if (sc->lmc_timing == LMC_CTL_CLOCK_SOURCE_INT) {
      lmc_led_off(sc, LMC_MII16_LED3);
  }
  else if (ticks == 0 ) {				/* no clock found ? */
      ret = 0;
      if (sc->last_led_err[3] != 1) {
	      sc->extra_stats.tx_lossOfClockCnt++;
	      printk(KERN_WARNING "%s: Lost Clock, Link Down\n", sc->name);
      }
      sc->last_led_err[3] = 1;
      lmc_led_on (sc, LMC_MII16_LED3);	/* turn ON red LED */
  }
  else {
      if(sc->last_led_err[3] == 1)
          printk(KERN_WARNING "%s: Clock Returned\n", sc->name);
      sc->last_led_err[3] = 0;
      lmc_led_off (sc, LMC_MII16_LED3);		/* turn OFF red LED */
  }

  if ((link_status & LMC_MII16_SSI_DSR) == 0) { /* Also HSSI CA */
      ret = 0;
      hw_hdsk = 0;
  }

#ifdef CONFIG_LMC_IGNORE_HARDWARE_HANDSHAKE
  if ((link_status & (LMC_MII16_SSI_CTS | LMC_MII16_SSI_DCD)) == 0){
      ret = 0;
      hw_hdsk = 0;
  }
#endif

  if(hw_hdsk == 0){
      if(sc->last_led_err[1] != 1)
          printk(KERN_WARNING "%s: DSR not asserted\n", sc->name);
      sc->last_led_err[1] = 1;
      lmc_led_off(sc, LMC_MII16_LED1);
  }
  else {
      if(sc->last_led_err[1] != 0)
          printk(KERN_WARNING "%s: DSR now asserted\n", sc->name);
      sc->last_led_err[1] = 0;
      lmc_led_on(sc, LMC_MII16_LED1);
  }

  if(ret == 1) {
      lmc_led_on(sc, LMC_MII16_LED2); /* Over all good status? */
  }
  
  return ret;
}

static void
lmc_ssi_set_link_status (lmc_softc_t * const sc, int state)
{
  if (state == LMC_LINK_UP)
    {
      sc->lmc_miireg16 |= (LMC_MII16_SSI_DTR | LMC_MII16_SSI_RTS);
      printk (LMC_PRINTF_FMT ": asserting DTR and RTS\n", LMC_PRINTF_ARGS);
    }
  else
    {
      sc->lmc_miireg16 &= ~(LMC_MII16_SSI_DTR | LMC_MII16_SSI_RTS);
      printk (LMC_PRINTF_FMT ": deasserting DTR and RTS\n", LMC_PRINTF_ARGS);
    }

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

}

/*
 * 0 == 16bit, 1 == 32bit
 */
static void
lmc_ssi_set_crc_length (lmc_softc_t * const sc, int state)
{
  if (state == LMC_CTL_CRC_LENGTH_32)
    {
      /* 32 bit */
      sc->lmc_miireg16 |= LMC_MII16_SSI_CRC;
      sc->ictl.crc_length = LMC_CTL_CRC_LENGTH_32;
      sc->lmc_crcSize = LMC_CTL_CRC_BYTESIZE_4;

    }
  else
    {
      /* 16 bit */
      sc->lmc_miireg16 &= ~LMC_MII16_SSI_CRC;
      sc->ictl.crc_length = LMC_CTL_CRC_LENGTH_16;
      sc->lmc_crcSize = LMC_CTL_CRC_BYTESIZE_2;
    }

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

/*
 * These are bits to program the ssi frequency generator
 */
static inline void
write_av9110_bit (lmc_softc_t * sc, int c)
{
  /*
   * set the data bit as we need it.
   */
  sc->lmc_gpio &= ~(LMC_GEP_CLK);
  if (c & 0x01)
    sc->lmc_gpio |= LMC_GEP_DATA;
  else
    sc->lmc_gpio &= ~(LMC_GEP_DATA);
  LMC_CSR_WRITE (sc, csr_gp, sc->lmc_gpio);

  /*
   * set the clock to high
   */
  sc->lmc_gpio |= LMC_GEP_CLK;
  LMC_CSR_WRITE (sc, csr_gp, sc->lmc_gpio);

  /*
   * set the clock to low again.
   */
  sc->lmc_gpio &= ~(LMC_GEP_CLK);
  LMC_CSR_WRITE (sc, csr_gp, sc->lmc_gpio);
}

static void write_av9110(lmc_softc_t *sc, u32 n, u32 m, u32 v, u32 x, u32 r)
{
  int i;

#if 0
  printk (LMC_PRINTF_FMT ": speed %u, %d %d %d %d %d\n",
	  LMC_PRINTF_ARGS, sc->ictl.clock_rate, n, m, v, x, r);
#endif

  sc->lmc_gpio |= LMC_GEP_SSI_GENERATOR;
  sc->lmc_gpio &= ~(LMC_GEP_DATA | LMC_GEP_CLK);
  LMC_CSR_WRITE (sc, csr_gp, sc->lmc_gpio);

  /*
   * Set the TXCLOCK, GENERATOR, SERIAL, and SERIALCLK
   * as outputs.
   */
  lmc_gpio_mkoutput (sc, (LMC_GEP_DATA | LMC_GEP_CLK
			  | LMC_GEP_SSI_GENERATOR));

  sc->lmc_gpio &= ~(LMC_GEP_SSI_GENERATOR);
  LMC_CSR_WRITE (sc, csr_gp, sc->lmc_gpio);

  /*
   * a shifting we will go...
   */
  for (i = 0; i < 7; i++)
    write_av9110_bit (sc, n >> i);
  for (i = 0; i < 7; i++)
    write_av9110_bit (sc, m >> i);
  for (i = 0; i < 1; i++)
    write_av9110_bit (sc, v >> i);
  for (i = 0; i < 2; i++)
    write_av9110_bit (sc, x >> i);
  for (i = 0; i < 2; i++)
    write_av9110_bit (sc, r >> i);
  for (i = 0; i < 5; i++)
    write_av9110_bit (sc, 0x17 >> i);

  /*
   * stop driving serial-related signals
   */
  lmc_gpio_mkinput (sc,
		    (LMC_GEP_DATA | LMC_GEP_CLK
		     | LMC_GEP_SSI_GENERATOR));
}

static void lmc_ssi_watchdog(lmc_softc_t * const sc)
{
	u16 mii17 = lmc_mii_readreg(sc, 0, 17);
	if (((mii17 >> 3) & 7) == 7)
		lmc_led_off(sc, LMC_MII16_LED2);
	else
		lmc_led_on(sc, LMC_MII16_LED2);
}

/*
 *  T1 methods
 */

/*
 * The framer regs are multiplexed through MII regs 17 & 18
 *  write the register address to MII reg 17 and the *  data to MII reg 18. */
static void
lmc_t1_write (lmc_softc_t * const sc, int a, int d)
{
  lmc_mii_writereg (sc, 0, 17, a);
  lmc_mii_writereg (sc, 0, 18, d);
}

/* Save a warning
static int
lmc_t1_read (lmc_softc_t * const sc, int a)
{
  lmc_mii_writereg (sc, 0, 17, a);
  return lmc_mii_readreg (sc, 0, 18);
}
*/


static void
lmc_t1_init (lmc_softc_t * const sc)
{
  u16 mii16;
  int i;

  sc->ictl.cardtype = LMC_CTL_CARDTYPE_LMC1200;
  mii16 = lmc_mii_readreg (sc, 0, 16);

  /* reset 8370 */
  mii16 &= ~LMC_MII16_T1_RST;
  lmc_mii_writereg (sc, 0, 16, mii16 | LMC_MII16_T1_RST);
  lmc_mii_writereg (sc, 0, 16, mii16);

  /* set T1 or E1 line.  Uses sc->lmcmii16 reg in function so update it */
  sc->lmc_miireg16 = mii16;
  lmc_t1_set_circuit_type(sc, LMC_CTL_CIRCUIT_TYPE_T1);
  mii16 = sc->lmc_miireg16;

  lmc_t1_write (sc, 0x01, 0x1B);	/* CR0     - primary control             */
  lmc_t1_write (sc, 0x02, 0x42);	/* JAT_CR  - jitter atten config         */
  lmc_t1_write (sc, 0x14, 0x00);	/* LOOP    - loopback config             */
  lmc_t1_write (sc, 0x15, 0x00);	/* DL3_TS  - external data link timeslot */
  lmc_t1_write (sc, 0x18, 0xFF);	/* PIO     - programmable I/O            */
  lmc_t1_write (sc, 0x19, 0x30);	/* POE     - programmable OE             */
  lmc_t1_write (sc, 0x1A, 0x0F);	/* CMUX    - clock input mux             */
  lmc_t1_write (sc, 0x20, 0x41);	/* LIU_CR  - RX LIU config               */
  lmc_t1_write (sc, 0x22, 0x76);	/* RLIU_CR - RX LIU config               */
  lmc_t1_write (sc, 0x40, 0x03);	/* RCR0    - RX config                   */
  lmc_t1_write (sc, 0x45, 0x00);	/* RALM    - RX alarm config             */
  lmc_t1_write (sc, 0x46, 0x05);	/* LATCH   - RX alarm/err/cntr latch     */
  lmc_t1_write (sc, 0x68, 0x40);	/* TLIU_CR - TX LIU config               */
  lmc_t1_write (sc, 0x70, 0x0D);	/* TCR0    - TX framer config            */
  lmc_t1_write (sc, 0x71, 0x05);	/* TCR1    - TX config                   */
  lmc_t1_write (sc, 0x72, 0x0B);	/* TFRM    - TX frame format             */
  lmc_t1_write (sc, 0x73, 0x00);	/* TERROR  - TX error insert             */
  lmc_t1_write (sc, 0x74, 0x00);	/* TMAN    - TX manual Sa/FEBE config    */
  lmc_t1_write (sc, 0x75, 0x00);	/* TALM    - TX alarm signal config      */
  lmc_t1_write (sc, 0x76, 0x00);	/* TPATT   - TX test pattern config      */
  lmc_t1_write (sc, 0x77, 0x00);	/* TLB     - TX inband loopback config   */
  lmc_t1_write (sc, 0x90, 0x05);	/* CLAD_CR - clock rate adapter config   */
  lmc_t1_write (sc, 0x91, 0x05);	/* CSEL    - clad freq sel               */
  lmc_t1_write (sc, 0xA6, 0x00);	/* DL1_CTL - DL1 control                 */
  lmc_t1_write (sc, 0xB1, 0x00);	/* DL2_CTL - DL2 control                 */
  lmc_t1_write (sc, 0xD0, 0x47);	/* SBI_CR  - sys bus iface config        */
  lmc_t1_write (sc, 0xD1, 0x70);	/* RSB_CR  - RX sys bus config           */
  lmc_t1_write (sc, 0xD4, 0x30);	/* TSB_CR  - TX sys bus config           */
  for (i = 0; i < 32; i++)
    {
      lmc_t1_write (sc, 0x0E0 + i, 0x00);	/* SBCn - sys bus per-channel ctl    */
      lmc_t1_write (sc, 0x100 + i, 0x00);	/* TPCn - TX per-channel ctl         */
      lmc_t1_write (sc, 0x180 + i, 0x00);	/* RPCn - RX per-channel ctl         */
    }
  for (i = 1; i < 25; i++)
    {
      lmc_t1_write (sc, 0x0E0 + i, 0x0D);	/* SBCn - sys bus per-channel ctl    */
    }

  mii16 |= LMC_MII16_T1_XOE;
  lmc_mii_writereg (sc, 0, 16, mii16);
  sc->lmc_miireg16 = mii16;
}

static void
lmc_t1_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_circuit_type (sc, LMC_CTL_CIRCUIT_TYPE_T1);
  sc->lmc_media->set_crc_length (sc, LMC_CTL_CRC_LENGTH_16);
  /* Right now we can only clock from out internal source */
  sc->ictl.clock_source = LMC_CTL_CLOCK_SOURCE_INT;
}
/* * Given a user provided state, set ourselves up to match it.  This will * always reset the card if needed.
 */
static void
lmc_t1_set_status (lmc_softc_t * const sc, lmc_ctl_t * ctl)
{
  if (ctl == NULL)
    {
      sc->lmc_media->set_circuit_type (sc, sc->ictl.circuit_type);
      lmc_set_protocol (sc, NULL);

      return;
    }
  /*
   * check for change in circuit type         */
  if (ctl->circuit_type == LMC_CTL_CIRCUIT_TYPE_T1
      && sc->ictl.circuit_type ==
      LMC_CTL_CIRCUIT_TYPE_E1) sc->lmc_media->set_circuit_type (sc,
								LMC_CTL_CIRCUIT_TYPE_E1);
  else if (ctl->circuit_type == LMC_CTL_CIRCUIT_TYPE_E1
	   && sc->ictl.circuit_type == LMC_CTL_CIRCUIT_TYPE_T1)
    sc->lmc_media->set_circuit_type (sc, LMC_CTL_CIRCUIT_TYPE_T1);
  lmc_set_protocol (sc, ctl);
}
/*
 * return hardware link status.
 * 0 == link is down, 1 == link is up.
 */ static int
lmc_t1_get_link_status (lmc_softc_t * const sc)
{
    u16 link_status;
    int ret = 1;

  /* LMC5245 (DS3) & LMC1200 (DS1) LED definitions
   * led0 yellow = far-end adapter is in Red alarm condition
   * led1 blue   = received an Alarm Indication signal
   *               (upstream failure)
   * led2 Green  = power to adapter, Gate Array loaded & driver
   *               attached
   * led3 red    = Loss of Signal (LOS) or out of frame (OOF)
   *               conditions detected on T3 receive signal
   */
    lmc_trace(sc->lmc_device, "lmc_t1_get_link_status in");
    lmc_led_on(sc, LMC_DS3_LED2);

    lmc_mii_writereg (sc, 0, 17, T1FRAMER_ALARM1_STATUS);
    link_status = lmc_mii_readreg (sc, 0, 18);


    if (link_status & T1F_RAIS) {			/* turn on blue LED */
        ret = 0;
        if(sc->last_led_err[1] != 1){
            printk(KERN_WARNING "%s: Receive AIS/Blue Alarm. Far end in RED alarm\n", sc->name);
        }
        lmc_led_on(sc, LMC_DS3_LED1);
        sc->last_led_err[1] = 1;
    }
    else {
        if(sc->last_led_err[1] != 0){
            printk(KERN_WARNING "%s: End AIS/Blue Alarm\n", sc->name);
        }
        lmc_led_off (sc, LMC_DS3_LED1);
        sc->last_led_err[1] = 0;
    }

    /*
     * Yellow Alarm is nasty evil stuff, looks at data patterns
     * inside the channel and confuses it with HDLC framing
     * ignore all yellow alarms.
     *
     * Do listen to MultiFrame Yellow alarm which while implemented
     * different ways isn't in the channel and hence somewhat
     * more reliable
     */

    if (link_status & T1F_RMYEL) {
        ret = 0;
        if(sc->last_led_err[0] != 1){
            printk(KERN_WARNING "%s: Receive Yellow AIS Alarm\n", sc->name);
        }
        lmc_led_on(sc, LMC_DS3_LED0);
        sc->last_led_err[0] = 1;
    }
    else {
        if(sc->last_led_err[0] != 0){
            printk(KERN_WARNING "%s: End of Yellow AIS Alarm\n", sc->name);
        }
        lmc_led_off(sc, LMC_DS3_LED0);
        sc->last_led_err[0] = 0;
    }

    /*
     * Loss of signal and los of frame
     * Use the green bit to identify which one lit the led
     */
    if(link_status & T1F_RLOF){
        ret = 0;
        if(sc->last_led_err[3] != 1){
            printk(KERN_WARNING "%s: Local Red Alarm: Loss of Framing\n", sc->name);
        }
        lmc_led_on(sc, LMC_DS3_LED3);
        sc->last_led_err[3] = 1;

    }
    else {
        if(sc->last_led_err[3] != 0){
            printk(KERN_WARNING "%s: End Red Alarm (LOF)\n", sc->name);
        }
        if( ! (link_status & T1F_RLOS))
            lmc_led_off(sc, LMC_DS3_LED3);
        sc->last_led_err[3] = 0;
    }
    
    if(link_status & T1F_RLOS){
        ret = 0;
        if(sc->last_led_err[2] != 1){
            printk(KERN_WARNING "%s: Local Red Alarm: Loss of Signal\n", sc->name);
        }
        lmc_led_on(sc, LMC_DS3_LED3);
        sc->last_led_err[2] = 1;

    }
    else {
        if(sc->last_led_err[2] != 0){
            printk(KERN_WARNING "%s: End Red Alarm (LOS)\n", sc->name);
        }
        if( ! (link_status & T1F_RLOF))
            lmc_led_off(sc, LMC_DS3_LED3);
        sc->last_led_err[2] = 0;
    }

    sc->lmc_xinfo.t1_alarm1_status = link_status;

    lmc_mii_writereg (sc, 0, 17, T1FRAMER_ALARM2_STATUS);
    sc->lmc_xinfo.t1_alarm2_status = lmc_mii_readreg (sc, 0, 18);

    
    lmc_trace(sc->lmc_device, "lmc_t1_get_link_status out");

    return ret;
}

/*
 * 1 == T1 Circuit Type , 0 == E1 Circuit Type
 */
static void
lmc_t1_set_circuit_type (lmc_softc_t * const sc, int ie)
{
  if (ie == LMC_CTL_CIRCUIT_TYPE_T1) {
      sc->lmc_miireg16 |= LMC_MII16_T1_Z;
      sc->ictl.circuit_type = LMC_CTL_CIRCUIT_TYPE_T1;
      printk(KERN_INFO "%s: In T1 Mode\n", sc->name);
  }
  else {
      sc->lmc_miireg16 &= ~LMC_MII16_T1_Z;
      sc->ictl.circuit_type = LMC_CTL_CIRCUIT_TYPE_E1;
      printk(KERN_INFO "%s: In E1 Mode\n", sc->name);
  }

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

/*
 * 0 == 16bit, 1 == 32bit */
static void
lmc_t1_set_crc_length (lmc_softc_t * const sc, int state)
{
  if (state == LMC_CTL_CRC_LENGTH_32)
    {
      /* 32 bit */
      sc->lmc_miireg16 |= LMC_MII16_T1_CRC;
      sc->ictl.crc_length = LMC_CTL_CRC_LENGTH_32;
      sc->lmc_crcSize = LMC_CTL_CRC_BYTESIZE_4;

    }
  else
    {
      /* 16 bit */ sc->lmc_miireg16 &= ~LMC_MII16_T1_CRC;
      sc->ictl.crc_length = LMC_CTL_CRC_LENGTH_16;
      sc->lmc_crcSize = LMC_CTL_CRC_BYTESIZE_2;

    }

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

/*
 * 1 == internal, 0 == external
 */
static void
lmc_t1_set_clock (lmc_softc_t * const sc, int ie)
{
  int old;
  old = ie;
  if (ie == LMC_CTL_CLOCK_SOURCE_EXT)
    {
      sc->lmc_gpio &= ~(LMC_GEP_SSI_TXCLOCK);
      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_SSI_TXCLOCK;
      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);
    }
}

static void
lmc_t1_watchdog (lmc_softc_t * const sc)
{
}

static void
lmc_set_protocol (lmc_softc_t * const sc, lmc_ctl_t * ctl)
{
	if (!ctl)
		sc->ictl.keepalive_onoff = LMC_CTL_ON;
}