aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/serio/hp_sdc_mlc.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/input/serio/hp_sdc_mlc.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/input/serio/hp_sdc_mlc.c')
-rw-r--r--drivers/input/serio/hp_sdc_mlc.c358
1 files changed, 358 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 00000000000..e3c44ffae67
--- /dev/null
+++ b/drivers/input/serio/hp_sdc_mlc.c
@@ -0,0 +1,358 @@
+/*
+ * 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);