/* * 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>#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");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) goto check;		if (!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 "Unkown 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) {	unsigned long flags;	struct hp_sdc_mlc_priv_s *priv;	int rc = 2;	priv = mlc->priv;	write_lock_irqsave(&(mlc->lock), flags);	/* 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 += 1000000 * (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;	goto done; done:	write_unlock_irqrestore(&(mlc->lock), flags);	return rc;}static int hp_sdc_mlc_cts (hil_mlc *mlc) {	struct hp_sdc_mlc_priv_s *priv;	unsigned long flags;	priv = mlc->priv;		write_lock_irqsave(&(mlc->lock), flags);	/* Try to down the semaphores -- they should be up. */	if (down_trylock(&(mlc->isem))) {		BUG();		goto busy;	}	if (down_trylock(&(mlc->osem))) {	 	BUG();		up(&(mlc->isem));		goto busy;	}	up(&(mlc->isem));	up(&(mlc->osem));	if (down_trylock(&(mlc->csem))) {		if (priv->trans.act.semaphore != &(mlc->csem)) goto poll;		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;	hp_sdc_enqueue_transaction(&(priv->trans)); busy:	write_unlock_irqrestore(&(mlc->lock), flags);	return 1; done:	priv->trans.act.semaphore = &(mlc->osem);	up(&(mlc->csem));	write_unlock_irqrestore(&(mlc->lock), flags);	return 0;}static void hp_sdc_mlc_out (hil_mlc *mlc) {	struct hp_sdc_mlc_priv_s *priv;	unsigned long flags;	priv = mlc->priv;	write_lock_irqsave(&(mlc->lock), flags);		/* Try to down the semaphore -- it should be up. */	if (down_trylock(&(mlc->osem))) {	 	BUG();		goto done;	}	if (mlc->opacket & HIL_DO_ALTER_CTRL) goto do_control; do_data:	if (priv->emtestmode) {		up(&(mlc->osem));		goto done;	}	/* Shouldn't be sending commands when loop may be busy */	if (down_trylock(&(mlc->csem))) {	 	BUG();		goto done;	}	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;	if ((mlc->opacket & (HIL_CTRL_APE | HIL_CTRL_IPF)) == HIL_CTRL_APE) {		BUG(); /* we cannot emulate this, it should not be used. */	}	if ((mlc->opacket & HIL_CTRL_ONLY) == HIL_CTRL_ONLY) goto control_only;	if (mlc->opacket & HIL_CTRL_APE) { 		BUG(); /* Should not send command/data after engaging APE */		goto done;	}	/* 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;		down_trylock(&(mlc->csem));	}  enqueue:	hp_sdc_enqueue_transaction(&(priv->trans)); done:	write_unlock_irqrestore(&(mlc->lock), flags);}static int __init hp_sdc_mlc_init(void){	hil_mlc *mlc = &hp_sdc_mlc;	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;	if (hil_mlc_register(mlc)) {		printk(KERN_WARNING PREFIX "Failed to register MLC structure with hil_mlc\n");		goto err0;	}	mlc->priv		= &hp_sdc_mlc_priv;	if (hp_sdc_request_hil_irq(&hp_sdc_mlc_isr)) {		printk(KERN_WARNING PREFIX "Request for raw HIL ISR hook denied\n");		goto err1;	}	return 0; err1:	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");	} err0:	return -EBUSY;}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);