diff options
Diffstat (limited to 'drivers/remoteproc/omap_remoteproc.c')
| -rw-r--r-- | drivers/remoteproc/omap_remoteproc.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c new file mode 100644 index 00000000000..69425c4e86f --- /dev/null +++ b/drivers/remoteproc/omap_remoteproc.c @@ -0,0 +1,229 @@ +/* + * 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: + /* msg contains the index of the triggered vring */ + 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, + }, +}; + +module_platform_driver(omap_rproc_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("OMAP Remote Processor control driver"); |