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-rw-r--r--drivers/remoteproc/Kconfig21
-rw-r--r--drivers/remoteproc/Makefile1
-rw-r--r--drivers/remoteproc/omap_remoteproc.c249
-rw-r--r--drivers/remoteproc/omap_remoteproc.h69
4 files changed, 340 insertions, 0 deletions
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index b250b15c0686..396c97a2661f 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -1,3 +1,24 @@
# REMOTEPROC gets selected by whoever wants it
config REMOTEPROC
tristate
+
+config OMAP_REMOTEPROC
+ tristate "OMAP remoteproc support"
+ depends on ARCH_OMAP4
+ select OMAP_IOMMU
+ select REMOTEPROC
+ select OMAP_MBOX_FWK
+ select RPMSG
+ default m
+ help
+ Say y here to support OMAP's remote processors (dual M3
+ and DSP on OMAP4) via the remote processor framework.
+
+ Currently only supported on OMAP4.
+
+ Usually you want to say y here, in order to enable multimedia
+ use-cases to run on your platform (multimedia codecs are
+ offloaded to remote DSP processors using this framework).
+
+ It's safe to say n here if you're not interested in multimedia
+ offloading or just want a bare minimum kernel.
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 370dffd54fee..df0897f69e16 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_REMOTEPROC) += remoteproc.o
remoteproc-y := remoteproc_core.o
remoteproc-y += remoteproc_debugfs.o
remoteproc-y += remoteproc_rpmsg.o
+obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
new file mode 100644
index 000000000000..b49ecbb91ef3
--- /dev/null
+++ b/drivers/remoteproc/omap_remoteproc.c
@@ -0,0 +1,249 @@
+/*
+ * OMAP Remote Processor driver
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@wizery.com>
+ * Brian Swetland <swetland@google.com>
+ * Fernando Guzman Lugo <fernando.lugo@ti.com>
+ * Mark Grosen <mgrosen@ti.com>
+ * Suman Anna <s-anna@ti.com>
+ * Hari Kanigeri <h-kanigeri2@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/remoteproc.h>
+
+#include <plat/mailbox.h>
+#include <plat/remoteproc.h>
+
+#include "omap_remoteproc.h"
+#include "remoteproc_internal.h"
+
+/**
+ * struct omap_rproc - omap remote processor state
+ * @mbox: omap mailbox handle
+ * @nb: notifier block that will be invoked on inbound mailbox messages
+ * @rproc: rproc handle
+ */
+struct omap_rproc {
+ struct omap_mbox *mbox;
+ struct notifier_block nb;
+ struct rproc *rproc;
+};
+
+/**
+ * omap_rproc_mbox_callback() - inbound mailbox message handler
+ * @this: notifier block
+ * @index: unused
+ * @data: mailbox payload
+ *
+ * This handler is invoked by omap's mailbox driver whenever a mailbox
+ * message is received. Usually, the mailbox payload simply contains
+ * the index of the virtqueue that is kicked by the remote processor,
+ * and we let remoteproc core handle it.
+ *
+ * In addition to virtqueue indices, we also have some out-of-band values
+ * that indicates different events. Those values are deliberately very
+ * big so they don't coincide with virtqueue indices.
+ */
+static int omap_rproc_mbox_callback(struct notifier_block *this,
+ unsigned long index, void *data)
+{
+ mbox_msg_t msg = (mbox_msg_t) data;
+ struct omap_rproc *oproc = container_of(this, struct omap_rproc, nb);
+ struct device *dev = oproc->rproc->dev;
+ const char *name = oproc->rproc->name;
+
+ dev_dbg(dev, "mbox msg: 0x%x\n", msg);
+
+ switch (msg) {
+ case RP_MBOX_CRASH:
+ /* just log this for now. later, we'll also do recovery */
+ dev_err(dev, "omap rproc %s crashed\n", name);
+ break;
+ case RP_MBOX_ECHO_REPLY:
+ dev_info(dev, "received echo reply from %s\n", name);
+ break;
+ default:
+ /* ignore vq indices which are too large to be valid */
+ if (msg >= 2) {
+ dev_warn(dev, "invalid mbox msg: 0x%x\n", msg);
+ break;
+ }
+
+ /*
+ * At this point, 'msg' contains the index of the vring
+ * which was just triggered.
+ */
+ if (rproc_vq_interrupt(oproc->rproc, msg) == IRQ_NONE)
+ dev_dbg(dev, "no message was found in vqid %d\n", msg);
+ }
+
+ return NOTIFY_DONE;
+}
+
+/* kick a virtqueue */
+static void omap_rproc_kick(struct rproc *rproc, int vqid)
+{
+ struct omap_rproc *oproc = rproc->priv;
+ int ret;
+
+ /* send the index of the triggered virtqueue in the mailbox payload */
+ ret = omap_mbox_msg_send(oproc->mbox, vqid);
+ if (ret)
+ dev_err(rproc->dev, "omap_mbox_msg_send failed: %d\n", ret);
+}
+
+/*
+ * Power up the remote processor.
+ *
+ * This function will be invoked only after the firmware for this rproc
+ * was loaded, parsed successfully, and all of its resource requirements
+ * were met.
+ */
+static int omap_rproc_start(struct rproc *rproc)
+{
+ struct omap_rproc *oproc = rproc->priv;
+ struct platform_device *pdev = to_platform_device(rproc->dev);
+ struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
+ int ret;
+
+ oproc->nb.notifier_call = omap_rproc_mbox_callback;
+
+ /* every omap rproc is assigned a mailbox instance for messaging */
+ oproc->mbox = omap_mbox_get(pdata->mbox_name, &oproc->nb);
+ if (IS_ERR(oproc->mbox)) {
+ ret = PTR_ERR(oproc->mbox);
+ dev_err(rproc->dev, "omap_mbox_get failed: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Ping the remote processor. this is only for sanity-sake;
+ * there is no functional effect whatsoever.
+ *
+ * Note that the reply will _not_ arrive immediately: this message
+ * will wait in the mailbox fifo until the remote processor is booted.
+ */
+ ret = omap_mbox_msg_send(oproc->mbox, RP_MBOX_ECHO_REQUEST);
+ if (ret) {
+ dev_err(rproc->dev, "omap_mbox_get failed: %d\n", ret);
+ goto put_mbox;
+ }
+
+ ret = pdata->device_enable(pdev);
+ if (ret) {
+ dev_err(rproc->dev, "omap_device_enable failed: %d\n", ret);
+ goto put_mbox;
+ }
+
+ return 0;
+
+put_mbox:
+ omap_mbox_put(oproc->mbox, &oproc->nb);
+ return ret;
+}
+
+/* power off the remote processor */
+static int omap_rproc_stop(struct rproc *rproc)
+{
+ struct platform_device *pdev = to_platform_device(rproc->dev);
+ struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
+ struct omap_rproc *oproc = rproc->priv;
+ int ret;
+
+ ret = pdata->device_shutdown(pdev);
+ if (ret)
+ return ret;
+
+ omap_mbox_put(oproc->mbox, &oproc->nb);
+
+ return 0;
+}
+
+static struct rproc_ops omap_rproc_ops = {
+ .start = omap_rproc_start,
+ .stop = omap_rproc_stop,
+ .kick = omap_rproc_kick,
+};
+
+static int __devinit omap_rproc_probe(struct platform_device *pdev)
+{
+ struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
+ struct omap_rproc *oproc;
+ struct rproc *rproc;
+ int ret;
+
+ ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+ if (ret) {
+ dev_err(pdev->dev.parent, "dma_set_coherent_mask: %d\n", ret);
+ return ret;
+ }
+
+ rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
+ pdata->firmware, sizeof(*oproc));
+ if (!rproc)
+ return -ENOMEM;
+
+ oproc = rproc->priv;
+ oproc->rproc = rproc;
+
+ platform_set_drvdata(pdev, rproc);
+
+ ret = rproc_register(rproc);
+ if (ret)
+ goto free_rproc;
+
+ return 0;
+
+free_rproc:
+ rproc_free(rproc);
+ return ret;
+}
+
+static int __devexit omap_rproc_remove(struct platform_device *pdev)
+{
+ struct rproc *rproc = platform_get_drvdata(pdev);
+
+ return rproc_unregister(rproc);
+}
+
+static struct platform_driver omap_rproc_driver = {
+ .probe = omap_rproc_probe,
+ .remove = __devexit_p(omap_rproc_remove),
+ .driver = {
+ .name = "omap-rproc",
+ .owner = THIS_MODULE,
+ },
+};
+
+/* most of the below will go when module_platform_driver is merged */
+static int __init omap_rproc_init(void)
+{
+ return platform_driver_register(&omap_rproc_driver);
+}
+module_init(omap_rproc_init);
+
+static void __exit omap_rproc_exit(void)
+{
+ platform_driver_unregister(&omap_rproc_driver);
+}
+module_exit(omap_rproc_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("OMAP Remote Processor control driver");
diff --git a/drivers/remoteproc/omap_remoteproc.h b/drivers/remoteproc/omap_remoteproc.h
new file mode 100644
index 000000000000..f6d2036d383d
--- /dev/null
+++ b/drivers/remoteproc/omap_remoteproc.h
@@ -0,0 +1,69 @@
+/*
+ * Remote processor messaging
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name Texas Instruments nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+ * OWNER 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 OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _OMAP_RPMSG_H
+#define _OMAP_RPMSG_H
+
+/*
+ * enum - Predefined Mailbox Messages
+ *
+ * @RP_MBOX_READY: informs the M3's that we're up and running. this is
+ * part of the init sequence sent that the M3 expects to see immediately
+ * after it is booted.
+ *
+ * @RP_MBOX_PENDING_MSG: informs the receiver that there is an inbound
+ * message waiting in its own receive-side vring. please note that currently
+ * this message is optional: alternatively, one can explicitly send the index
+ * of the triggered virtqueue itself. the preferred approach will be decided
+ * as we progress and experiment with those two different approaches.
+ *
+ * @RP_MBOX_CRASH: this message is sent if BIOS crashes
+ *
+ * @RP_MBOX_ECHO_REQUEST: a mailbox-level "ping" message.
+ *
+ * @RP_MBOX_ECHO_REPLY: a mailbox-level reply to a "ping"
+ *
+ * @RP_MBOX_ABORT_REQUEST: a "please crash" request, used for testing the
+ * recovery mechanism (to some extent).
+ */
+enum omap_rp_mbox_messages {
+ RP_MBOX_READY = 0xFFFFFF00,
+ RP_MBOX_PENDING_MSG = 0xFFFFFF01,
+ RP_MBOX_CRASH = 0xFFFFFF02,
+ RP_MBOX_ECHO_REQUEST = 0xFFFFFF03,
+ RP_MBOX_ECHO_REPLY = 0xFFFFFF04,
+ RP_MBOX_ABORT_REQUEST = 0xFFFFFF05,
+};
+
+#endif /* _OMAP_RPMSG_H */

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