1 files changed, 355 insertions, 0 deletions
diff --git a/drivers/input/serio/hp_sdc_mlc.c b/drivers/input/serio/hp_sdc_mlc.c
new file mode 100644
index 000000000..3e85e9039
--- /dev/null
+++ b/drivers/input/serio/hp_sdc_mlc.c
@@ -0,0 +1,355 @@
+/*
+ * 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)) {
+		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;
+		}
+		if (time_after(jiffies, mlc->instart + 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);