1 files changed, 249 insertions, 0 deletions

diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
new file mode 100644
index 00000000000..b49ecbb91ef
--- /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");