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/*
* 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/mailbox_client.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: mailbox channel handle
* @client: mailbox client to request the mailbox channel
* @rproc: rproc handle
*/
struct omap_rproc {
struct mbox_chan *mbox;
struct mbox_client client;
struct rproc *rproc;
};
/**
* omap_rproc_mbox_callback() - inbound mailbox message handler
* @client: mailbox client pointer used for requesting the mailbox channel
* @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 void omap_rproc_mbox_callback(struct mbox_client *client, void *data)
{
struct omap_rproc *oproc = container_of(client, struct omap_rproc,
client);
struct device *dev = oproc->rproc->dev.parent;
const char *name = oproc->rproc->name;
u32 msg = (u32)data;
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);
}
}
/* 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 = mbox_send_message(oproc->mbox, (void *)vqid);
if (ret < 0)
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;
struct mbox_client *client = &oproc->client;
if (pdata->set_bootaddr)
pdata->set_bootaddr(rproc->bootaddr);
client->dev = dev;
client->tx_done = NULL;
client->rx_callback = omap_rproc_mbox_callback;
client->tx_block = false;
client->knows_txdone = false;
oproc->mbox = omap_mbox_request_channel(client, pdata->mbox_name);
if (IS_ERR(oproc->mbox)) {
ret = -EBUSY;
dev_err(dev, "mbox_request_channel failed: %ld\n",
PTR_ERR(oproc->mbox));
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 = mbox_send_message(oproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
if (ret < 0) {
dev_err(dev, "mbox_send_message 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:
mbox_free_channel(oproc->mbox);
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;
mbox_free_channel(oproc->mbox);
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",
},
};
module_platform_driver(omap_rproc_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("OMAP Remote Processor control driver");
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