238 lines
6.1 KiB
C
238 lines
6.1 KiB
C
/*
|
|
* 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 <linux/omap-mailbox.h>
|
|
|
|
#include <linux/platform_data/remoteproc-omap.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.parent;
|
|
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;
|
|
struct device *dev = rproc->dev.parent;
|
|
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(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 device *dev = rproc->dev.parent;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
|
|
int ret;
|
|
|
|
if (pdata->set_bootaddr)
|
|
pdata->set_bootaddr(rproc->bootaddr);
|
|
|
|
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(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(dev, "omap_mbox_get failed: %d\n", ret);
|
|
goto put_mbox;
|
|
}
|
|
|
|
ret = pdata->device_enable(pdev);
|
|
if (ret) {
|
|
dev_err(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 device *dev = rproc->dev.parent;
|
|
struct platform_device *pdev = to_platform_device(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 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, "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_add(rproc);
|
|
if (ret)
|
|
goto free_rproc;
|
|
|
|
return 0;
|
|
|
|
free_rproc:
|
|
rproc_put(rproc);
|
|
return ret;
|
|
}
|
|
|
|
static int omap_rproc_remove(struct platform_device *pdev)
|
|
{
|
|
struct rproc *rproc = platform_get_drvdata(pdev);
|
|
|
|
rproc_del(rproc);
|
|
rproc_put(rproc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver omap_rproc_driver = {
|
|
.probe = omap_rproc_probe,
|
|
.remove = 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");
|