drivers/input/serio/hp_sdc_mlc.c - third_party/linux - Git at Google

 /*
  * Access to HP-HIL MLC through HP System Device Controller.
  *
  * Copyright (c) 2001 Brian S. Julin
  * All rights reserved.
  *
  * 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,
  *    without modification.
  * 2. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * Alternatively, this software may be distributed under the terms of the
  * GNU General Public License ("GPL").
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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
  *
  * References:
  * HP-HIL Technical Reference Manual.  Hewlett Packard Product No. 45918A
  * System Device Controller Microprocessor Firmware Theory of Operation
  *      for Part Number 1820-4784 Revision B.  Dwg No. A-1820-4784-2
  *
  */

 #include <linux/hil_mlc.h>
 #include <linux/hp_sdc.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/string.h>
 #include <linux/semaphore.h>

 #define PREFIX "HP SDC MLC: "

 static hil_mlc hp_sdc_mlc;

 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
 MODULE_DESCRIPTION("Glue for onboard HIL MLC in HP-PARISC machines");
 MODULE_LICENSE("Dual BSD/GPL");

 static struct hp_sdc_mlc_priv_s {
 	int emtestmode;
 	hp_sdc_transaction trans;
 	u8 tseq[16];
 	int got5x;
 } hp_sdc_mlc_priv;

 /************************* Interrupt context ******************************/
 static void hp_sdc_mlc_isr (int irq, void *dev_id,
 			    uint8_t status, uint8_t data)
 {
 	int idx;
 	hil_mlc *mlc = &hp_sdc_mlc;

 	write_lock(&mlc->lock);
 	if (mlc->icount < 0) {
 		printk(KERN_WARNING PREFIX "HIL Overflow!\n");
 		up(&mlc->isem);
 		goto out;
 	}
 	idx = 15 - mlc->icount;
 	if ((status & HP_SDC_STATUS_IRQMASK) == HP_SDC_STATUS_HILDATA) {
 		mlc->ipacket[idx] |= data | HIL_ERR_INT;
 		mlc->icount--;
 		if (hp_sdc_mlc_priv.got5x || !idx)
 			goto check;
 		if ((mlc->ipacket[idx - 1] & HIL_PKT_ADDR_MASK) !=
 		    (mlc->ipacket[idx] & HIL_PKT_ADDR_MASK)) {
 			mlc->ipacket[idx] &= ~HIL_PKT_ADDR_MASK;
 			mlc->ipacket[idx] |= (mlc->ipacket[idx - 1]
 						& HIL_PKT_ADDR_MASK);
 		}
 		goto check;
 	}
 	/* We know status is 5X */
 	if (data & HP_SDC_HIL_ISERR)
 		goto err;
 	mlc->ipacket[idx] =
 		(data & HP_SDC_HIL_R1MASK) << HIL_PKT_ADDR_SHIFT;
 	hp_sdc_mlc_priv.got5x = 1;
 	goto out;

  check:
 	hp_sdc_mlc_priv.got5x = 0;
 	if (mlc->imatch == 0)
 		goto done;
 	if ((mlc->imatch == (HIL_ERR_INT | HIL_PKT_CMD | HIL_CMD_POL))
 	    && (mlc->ipacket[idx] == (mlc->imatch | idx)))
 		goto done;
 	if (mlc->ipacket[idx] == mlc->imatch)
 		goto done;
 	goto out;

  err:
 	printk(KERN_DEBUG PREFIX "err code %x\n", data);

 	switch (data) {
 	case HP_SDC_HIL_RC_DONE:
 		printk(KERN_WARNING PREFIX "Bastard SDC reconfigured loop!\n");
 		break;

 	case HP_SDC_HIL_ERR:
 		mlc->ipacket[idx] |= HIL_ERR_INT | HIL_ERR_PERR |
 					HIL_ERR_FERR | HIL_ERR_FOF;
 		break;

 	case HP_SDC_HIL_TO:
 		mlc->ipacket[idx] |= HIL_ERR_INT | HIL_ERR_LERR;
 		break;

 	case HP_SDC_HIL_RC:
 		printk(KERN_WARNING PREFIX "Bastard SDC decided to reconfigure loop!\n");
 		break;

 	default:
 		printk(KERN_WARNING PREFIX "Unknown HIL Error status (%x)!\n", data);
 		break;
 	}

 	/* No more data will be coming due to an error. */
  done:
 	tasklet_schedule(mlc->tasklet);
 	up(&mlc->isem);
  out:
 	write_unlock(&mlc->lock);
 }


 /******************** Tasklet or userspace context functions ****************/

 static int hp_sdc_mlc_in(hil_mlc *mlc, suseconds_t timeout)
 {
 	struct hp_sdc_mlc_priv_s *priv;
 	int rc = 2;

 	priv = mlc->priv;

 	/* Try to down the semaphore */
 	if (down_trylock(&mlc->isem)) {
 		struct timeval tv;
 		if (priv->emtestmode) {
 			mlc->ipacket[0] =
 				HIL_ERR_INT | (mlc->opacket &
 					       (HIL_PKT_CMD |
 						HIL_PKT_ADDR_MASK |
 						HIL_PKT_DATA_MASK));
 			mlc->icount = 14;
 			/* printk(KERN_DEBUG PREFIX ">[%x]\n", mlc->ipacket[0]); */
 			goto wasup;
 		}
 		do_gettimeofday(&tv);
 		tv.tv_usec += USEC_PER_SEC * (tv.tv_sec - mlc->instart.tv_sec);
 		if (tv.tv_usec - mlc->instart.tv_usec > mlc->intimeout) {
 			/*	printk("!%i %i",
 				tv.tv_usec - mlc->instart.tv_usec,
 				mlc->intimeout);
 			 */
 			rc = 1;
 			up(&mlc->isem);
 		}
 		goto done;
 	}
  wasup:
 	up(&mlc->isem);
 	rc = 0;
  done:
 	return rc;
 }

 static int hp_sdc_mlc_cts(hil_mlc *mlc)
 {
 	struct hp_sdc_mlc_priv_s *priv;

 	priv = mlc->priv;

 	/* Try to down the semaphores -- they should be up. */
 	BUG_ON(down_trylock(&mlc->isem));
 	BUG_ON(down_trylock(&mlc->osem));

 	up(&mlc->isem);
 	up(&mlc->osem);

 	if (down_trylock(&mlc->csem)) {
 		if (priv->trans.act.semaphore != &mlc->csem)
 			goto poll;
 		else
 			goto busy;
 	}

 	if (!(priv->tseq[4] & HP_SDC_USE_LOOP))
 		goto done;

  poll:
 	priv->trans.act.semaphore = &mlc->csem;
 	priv->trans.actidx = 0;
 	priv->trans.idx = 1;
 	priv->trans.endidx = 5;
 	priv->tseq[0] =
 		HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN | HP_SDC_ACT_SEMAPHORE;
 	priv->tseq[1] = HP_SDC_CMD_READ_USE;
 	priv->tseq[2] = 1;
 	priv->tseq[3] = 0;
 	priv->tseq[4] = 0;
 	return __hp_sdc_enqueue_transaction(&priv->trans);
  busy:
 	return 1;
  done:
 	priv->trans.act.semaphore = &mlc->osem;
 	up(&mlc->csem);
 	return 0;
 }

 static int hp_sdc_mlc_out(hil_mlc *mlc)
 {
 	struct hp_sdc_mlc_priv_s *priv;

 	priv = mlc->priv;

 	/* Try to down the semaphore -- it should be up. */
 	BUG_ON(down_trylock(&mlc->osem));

 	if (mlc->opacket & HIL_DO_ALTER_CTRL)
 		goto do_control;

  do_data:
 	if (priv->emtestmode) {
 		up(&mlc->osem);
 		return 0;
 	}
 	/* Shouldn't be sending commands when loop may be busy */
 	BUG_ON(down_trylock(&mlc->csem));
 	up(&mlc->csem);

 	priv->trans.actidx = 0;
 	priv->trans.idx = 1;
 	priv->trans.act.semaphore = &mlc->osem;
 	priv->trans.endidx = 6;
 	priv->tseq[0] =
 		HP_SDC_ACT_DATAREG | HP_SDC_ACT_POSTCMD | HP_SDC_ACT_SEMAPHORE;
 	priv->tseq[1] = 0x7;
 	priv->tseq[2] =
 		(mlc->opacket &
 		 (HIL_PKT_ADDR_MASK | HIL_PKT_CMD))
 		   >> HIL_PKT_ADDR_SHIFT;
 	priv->tseq[3] =
 		(mlc->opacket & HIL_PKT_DATA_MASK)
 		  >> HIL_PKT_DATA_SHIFT;
 	priv->tseq[4] = 0;  /* No timeout */
 	if (priv->tseq[3] == HIL_CMD_DHR)
 		priv->tseq[4] = 1;
 	priv->tseq[5] = HP_SDC_CMD_DO_HIL;
 	goto enqueue;

  do_control:
 	priv->emtestmode = mlc->opacket & HIL_CTRL_TEST;

 	/* we cannot emulate this, it should not be used. */
 	BUG_ON((mlc->opacket & (HIL_CTRL_APE | HIL_CTRL_IPF)) == HIL_CTRL_APE);

 	if ((mlc->opacket & HIL_CTRL_ONLY) == HIL_CTRL_ONLY)
 		goto control_only;

 	/* Should not send command/data after engaging APE */
 	BUG_ON(mlc->opacket & HIL_CTRL_APE);

 	/* Disengaging APE this way would not be valid either since
 	 * the loop must be allowed to idle.
 	 *
 	 * So, it works out that we really never actually send control
 	 * and data when using SDC, we just send the data.
 	 */
 	goto do_data;

  control_only:
 	priv->trans.actidx = 0;
 	priv->trans.idx = 1;
 	priv->trans.act.semaphore = &mlc->osem;
 	priv->trans.endidx = 4;
 	priv->tseq[0] =
 	  HP_SDC_ACT_PRECMD | HP_SDC_ACT_DATAOUT | HP_SDC_ACT_SEMAPHORE;
 	priv->tseq[1] = HP_SDC_CMD_SET_LPC;
 	priv->tseq[2] = 1;
 	/* priv->tseq[3] = (mlc->ddc + 1) | HP_SDC_LPS_ACSUCC; */
 	priv->tseq[3] = 0;
 	if (mlc->opacket & HIL_CTRL_APE) {
 		priv->tseq[3] |= HP_SDC_LPC_APE_IPF;
 		BUG_ON(down_trylock(&mlc->csem));
 	}
  enqueue:
 	return hp_sdc_enqueue_transaction(&priv->trans);
 }

 static int __init hp_sdc_mlc_init(void)
 {
 	hil_mlc *mlc = &hp_sdc_mlc;
 	int err;

 #ifdef __mc68000__
 	if (!MACH_IS_HP300)
 		return -ENODEV;
 #endif

 	printk(KERN_INFO PREFIX "Registering the System Domain Controller's HIL MLC.\n");

 	hp_sdc_mlc_priv.emtestmode = 0;
 	hp_sdc_mlc_priv.trans.seq = hp_sdc_mlc_priv.tseq;
 	hp_sdc_mlc_priv.trans.act.semaphore = &mlc->osem;
 	hp_sdc_mlc_priv.got5x = 0;

 	mlc->cts = &hp_sdc_mlc_cts;
 	mlc->in	= &hp_sdc_mlc_in;
 	mlc->out = &hp_sdc_mlc_out;
 	mlc->priv = &hp_sdc_mlc_priv;

 	err = hil_mlc_register(mlc);
 	if (err) {
 		printk(KERN_WARNING PREFIX "Failed to register MLC structure with hil_mlc\n");
 		return err;
 	}

 	if (hp_sdc_request_hil_irq(&hp_sdc_mlc_isr)) {
 		printk(KERN_WARNING PREFIX "Request for raw HIL ISR hook denied\n");
 		if (hil_mlc_unregister(mlc))
 			printk(KERN_ERR PREFIX "Failed to unregister MLC structure with hil_mlc.\n"
 				"This is bad.  Could cause an oops.\n");
 		return -EBUSY;
 	}

 	return 0;
 }

 static void __exit hp_sdc_mlc_exit(void)
 {
 	hil_mlc *mlc = &hp_sdc_mlc;

 	if (hp_sdc_release_hil_irq(&hp_sdc_mlc_isr))
 		printk(KERN_ERR PREFIX "Failed to release the raw HIL ISR hook.\n"
 			"This is bad.  Could cause an oops.\n");

 	if (hil_mlc_unregister(mlc))
 		printk(KERN_ERR PREFIX "Failed to unregister MLC structure with hil_mlc.\n"
 			"This is bad.  Could cause an oops.\n");
 }

 module_init(hp_sdc_mlc_init);
 module_exit(hp_sdc_mlc_exit);
	/*
	* Access to HP-HIL MLC through HP System Device Controller.
	*
	* Copyright (c) 2001 Brian S. Julin
	* All rights reserved.
	*
	* 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,
	* without modification.
	* 2. The name of the author may not be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* Alternatively, this software may be distributed under the terms of the
	* GNU General Public License ("GPL").
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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
	*
	* References:
	* HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A
	* System Device Controller Microprocessor Firmware Theory of Operation
	* for Part Number 1820-4784 Revision B. Dwg No. A-1820-4784-2
	*
	*/

	#include <linux/hil_mlc.h>
	#include <linux/hp_sdc.h>
	#include <linux/errno.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/string.h>
	#include <linux/semaphore.h>

	#define PREFIX "HP SDC MLC: "

	static hil_mlc hp_sdc_mlc;

	MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
	MODULE_DESCRIPTION("Glue for onboard HIL MLC in HP-PARISC machines");
	MODULE_LICENSE("Dual BSD/GPL");

	static struct hp_sdc_mlc_priv_s {
	int emtestmode;
	hp_sdc_transaction trans;
	u8 tseq[16];
	int got5x;
	} hp_sdc_mlc_priv;

	/*********************** Interrupt context ****************************/
	static void hp_sdc_mlc_isr (int irq, void *dev_id,
	uint8_t status, uint8_t data)
	{
	int idx;
	hil_mlc *mlc = &hp_sdc_mlc;

	write_lock(&mlc->lock);
	if (mlc->icount < 0) {
	printk(KERN_WARNING PREFIX "HIL Overflow!\n");
	up(&mlc->isem);
	goto out;
	}
	idx = 15 - mlc->icount;
	if ((status & HP_SDC_STATUS_IRQMASK) == HP_SDC_STATUS_HILDATA) {
	mlc->ipacket[idx] \|= data \| HIL_ERR_INT;
	mlc->icount--;
	if (hp_sdc_mlc_priv.got5x \|\| !idx)
	goto check;
	if ((mlc->ipacket[idx - 1] & HIL_PKT_ADDR_MASK) !=
	(mlc->ipacket[idx] & HIL_PKT_ADDR_MASK)) {
	mlc->ipacket[idx] &= ~HIL_PKT_ADDR_MASK;
	mlc->ipacket[idx] \|= (mlc->ipacket[idx - 1]
	& HIL_PKT_ADDR_MASK);
	}
	goto check;
	}
	/* We know status is 5X */
	if (data & HP_SDC_HIL_ISERR)
	goto err;
	mlc->ipacket[idx] =
	(data & HP_SDC_HIL_R1MASK) << HIL_PKT_ADDR_SHIFT;
	hp_sdc_mlc_priv.got5x = 1;
	goto out;

	check:
	hp_sdc_mlc_priv.got5x = 0;
	if (mlc->imatch == 0)
	goto done;
	if ((mlc->imatch == (HIL_ERR_INT \| HIL_PKT_CMD \| HIL_CMD_POL))
	&& (mlc->ipacket[idx] == (mlc->imatch \| idx)))
	goto done;
	if (mlc->ipacket[idx] == mlc->imatch)
	goto done;
	goto out;

	err:
	printk(KERN_DEBUG PREFIX "err code %x\n", data);

	switch (data) {
	case HP_SDC_HIL_RC_DONE:
	printk(KERN_WARNING PREFIX "Bastard SDC reconfigured loop!\n");
	break;

	case HP_SDC_HIL_ERR:
	mlc->ipacket[idx] \|= HIL_ERR_INT \| HIL_ERR_PERR \|
	HIL_ERR_FERR \| HIL_ERR_FOF;
	break;

	case HP_SDC_HIL_TO:
	mlc->ipacket[idx] \|= HIL_ERR_INT \| HIL_ERR_LERR;
	break;

	case HP_SDC_HIL_RC:
	printk(KERN_WARNING PREFIX "Bastard SDC decided to reconfigure loop!\n");
	break;

	default:
	printk(KERN_WARNING PREFIX "Unknown HIL Error status (%x)!\n", data);
	break;
	}

	/* No more data will be coming due to an error. */
	done:
	tasklet_schedule(mlc->tasklet);
	up(&mlc->isem);
	out:
	write_unlock(&mlc->lock);
	}


	/****************** Tasklet or userspace context functions **************/

	static int hp_sdc_mlc_in(hil_mlc *mlc, suseconds_t timeout)
	{
	struct hp_sdc_mlc_priv_s *priv;
	int rc = 2;

	priv = mlc->priv;

	/* Try to down the semaphore */
	if (down_trylock(&mlc->isem)) {
	struct timeval tv;
	if (priv->emtestmode) {
	mlc->ipacket[0] =
	HIL_ERR_INT \| (mlc->opacket &
	(HIL_PKT_CMD \|
	HIL_PKT_ADDR_MASK \|
	HIL_PKT_DATA_MASK));
	mlc->icount = 14;
	/* printk(KERN_DEBUG PREFIX ">[%x]\n", mlc->ipacket[0]); */
	goto wasup;
	}
	do_gettimeofday(&tv);
	tv.tv_usec += USEC_PER_SEC * (tv.tv_sec - mlc->instart.tv_sec);
	if (tv.tv_usec - mlc->instart.tv_usec > mlc->intimeout) {
	/* printk("!%i %i",
	tv.tv_usec - mlc->instart.tv_usec,
	mlc->intimeout);
	*/
	rc = 1;
	up(&mlc->isem);
	}
	goto done;
	}
	wasup:
	up(&mlc->isem);
	rc = 0;
	done:
	return rc;
	}

	static int hp_sdc_mlc_cts(hil_mlc *mlc)
	{
	struct hp_sdc_mlc_priv_s *priv;

	priv = mlc->priv;

	/* Try to down the semaphores -- they should be up. */
	BUG_ON(down_trylock(&mlc->isem));
	BUG_ON(down_trylock(&mlc->osem));

	up(&mlc->isem);
	up(&mlc->osem);

	if (down_trylock(&mlc->csem)) {
	if (priv->trans.act.semaphore != &mlc->csem)
	goto poll;
	else
	goto busy;
	}

	if (!(priv->tseq[4] & HP_SDC_USE_LOOP))
	goto done;

	poll:
	priv->trans.act.semaphore = &mlc->csem;
	priv->trans.actidx = 0;
	priv->trans.idx = 1;
	priv->trans.endidx = 5;
	priv->tseq[0] =
	HP_SDC_ACT_POSTCMD \| HP_SDC_ACT_DATAIN \| HP_SDC_ACT_SEMAPHORE;
	priv->tseq[1] = HP_SDC_CMD_READ_USE;
	priv->tseq[2] = 1;
	priv->tseq[3] = 0;
	priv->tseq[4] = 0;
	return __hp_sdc_enqueue_transaction(&priv->trans);
	busy:
	return 1;
	done:
	priv->trans.act.semaphore = &mlc->osem;
	up(&mlc->csem);
	return 0;
	}

	static int hp_sdc_mlc_out(hil_mlc *mlc)
	{
	struct hp_sdc_mlc_priv_s *priv;

	priv = mlc->priv;

	/* Try to down the semaphore -- it should be up. */
	BUG_ON(down_trylock(&mlc->osem));

	if (mlc->opacket & HIL_DO_ALTER_CTRL)
	goto do_control;

	do_data:
	if (priv->emtestmode) {
	up(&mlc->osem);
	return 0;
	}
	/* Shouldn't be sending commands when loop may be busy */
	BUG_ON(down_trylock(&mlc->csem));
	up(&mlc->csem);

	priv->trans.actidx = 0;
	priv->trans.idx = 1;
	priv->trans.act.semaphore = &mlc->osem;
	priv->trans.endidx = 6;
	priv->tseq[0] =
	HP_SDC_ACT_DATAREG \| HP_SDC_ACT_POSTCMD \| HP_SDC_ACT_SEMAPHORE;
	priv->tseq[1] = 0x7;
	priv->tseq[2] =
	(mlc->opacket &
	(HIL_PKT_ADDR_MASK \| HIL_PKT_CMD))
	>> HIL_PKT_ADDR_SHIFT;
	priv->tseq[3] =
	(mlc->opacket & HIL_PKT_DATA_MASK)
	>> HIL_PKT_DATA_SHIFT;
	priv->tseq[4] = 0; /* No timeout */
	if (priv->tseq[3] == HIL_CMD_DHR)
	priv->tseq[4] = 1;
	priv->tseq[5] = HP_SDC_CMD_DO_HIL;
	goto enqueue;

	do_control:
	priv->emtestmode = mlc->opacket & HIL_CTRL_TEST;

	/* we cannot emulate this, it should not be used. */
	BUG_ON((mlc->opacket & (HIL_CTRL_APE \| HIL_CTRL_IPF)) == HIL_CTRL_APE);

	if ((mlc->opacket & HIL_CTRL_ONLY) == HIL_CTRL_ONLY)
	goto control_only;

	/* Should not send command/data after engaging APE */
	BUG_ON(mlc->opacket & HIL_CTRL_APE);

	/* Disengaging APE this way would not be valid either since
	* the loop must be allowed to idle.
	*
	* So, it works out that we really never actually send control
	* and data when using SDC, we just send the data.
	*/
	goto do_data;

	control_only:
	priv->trans.actidx = 0;
	priv->trans.idx = 1;
	priv->trans.act.semaphore = &mlc->osem;
	priv->trans.endidx = 4;
	priv->tseq[0] =
	HP_SDC_ACT_PRECMD \| HP_SDC_ACT_DATAOUT \| HP_SDC_ACT_SEMAPHORE;
	priv->tseq[1] = HP_SDC_CMD_SET_LPC;
	priv->tseq[2] = 1;
	/* priv->tseq[3] = (mlc->ddc + 1) \| HP_SDC_LPS_ACSUCC; */
	priv->tseq[3] = 0;
	if (mlc->opacket & HIL_CTRL_APE) {
	priv->tseq[3] \|= HP_SDC_LPC_APE_IPF;
	BUG_ON(down_trylock(&mlc->csem));
	}
	enqueue:
	return hp_sdc_enqueue_transaction(&priv->trans);
	}

	static int __init hp_sdc_mlc_init(void)
	{
	hil_mlc *mlc = &hp_sdc_mlc;
	int err;

	#ifdef __mc68000__
	if (!MACH_IS_HP300)
	return -ENODEV;
	#endif

	printk(KERN_INFO PREFIX "Registering the System Domain Controller's HIL MLC.\n");

	hp_sdc_mlc_priv.emtestmode = 0;
	hp_sdc_mlc_priv.trans.seq = hp_sdc_mlc_priv.tseq;
	hp_sdc_mlc_priv.trans.act.semaphore = &mlc->osem;
	hp_sdc_mlc_priv.got5x = 0;

	mlc->cts = &hp_sdc_mlc_cts;
	mlc->in = &hp_sdc_mlc_in;
	mlc->out = &hp_sdc_mlc_out;
	mlc->priv = &hp_sdc_mlc_priv;

	err = hil_mlc_register(mlc);
	if (err) {
	printk(KERN_WARNING PREFIX "Failed to register MLC structure with hil_mlc\n");
	return err;
	}

	if (hp_sdc_request_hil_irq(&hp_sdc_mlc_isr)) {
	printk(KERN_WARNING PREFIX "Request for raw HIL ISR hook denied\n");
	if (hil_mlc_unregister(mlc))
	printk(KERN_ERR PREFIX "Failed to unregister MLC structure with hil_mlc.\n"
	"This is bad. Could cause an oops.\n");
	return -EBUSY;
	}

	return 0;
	}

	static void __exit hp_sdc_mlc_exit(void)
	{
	hil_mlc *mlc = &hp_sdc_mlc;

	if (hp_sdc_release_hil_irq(&hp_sdc_mlc_isr))
	printk(KERN_ERR PREFIX "Failed to release the raw HIL ISR hook.\n"
	"This is bad. Could cause an oops.\n");

	if (hil_mlc_unregister(mlc))
	printk(KERN_ERR PREFIX "Failed to unregister MLC structure with hil_mlc.\n"
	"This is bad. Could cause an oops.\n");
	}

	module_init(hp_sdc_mlc_init);
	module_exit(hp_sdc_mlc_exit);