Commit ab646a24 authored by Arnd Bergmann's avatar Arnd Bergmann

Merge tag 'rpmsg-for-3.4' of...

Merge tag 'rpmsg-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/ohad/remoteproc into next/rpmsg

* tag 'rpmsg-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/ohad/remoteproc:
  remoteproc: s/big switch/lookup table/
  remoteproc: bail out if firmware has different endianess
  remoteproc: don't use virtio's weak barriers
  rpmsg: rename virtqueue_add_buf_gfp to virtqueue_add_buf
  rpmsg: depend on EXPERIMENTAL
  remoteproc: depend on EXPERIMENTAL
  rpmsg: add Kconfig menu
  remoteproc: add Kconfig menu
  remoteproc: look for truncated firmware images
  remoteproc/omap: utilize module_platform_driver
  remoteproc: remove unused resource type
  remoteproc: avoid registering a virtio device if not supported
  remoteproc: do not require an iommu
  samples/rpmsg: add an rpmsg driver sample
  rpmsg: add virtio-based remote processor messaging bus
  remoteproc/omap: add a remoteproc driver for OMAP4
  remoteproc: create rpmsg virtio device
  remoteproc: add debugfs entries
  remoteproc: add framework for controlling remote processors
parents d65b4e98 e12bc14b
What: /sys/bus/rpmsg/devices/.../name
Date: June 2011
KernelVersion: 3.3
Contact: Ohad Ben-Cohen <ohad@wizery.com>
Description:
Every rpmsg device is a communication channel with a remote
processor. Channels are identified with a (textual) name,
which is maximum 32 bytes long (defined as RPMSG_NAME_SIZE in
rpmsg.h).
This sysfs entry contains the name of this channel.
What: /sys/bus/rpmsg/devices/.../src
Date: June 2011
KernelVersion: 3.3
Contact: Ohad Ben-Cohen <ohad@wizery.com>
Description:
Every rpmsg device is a communication channel with a remote
processor. Channels have a local ("source") rpmsg address,
and remote ("destination") rpmsg address. When an entity
starts listening on one end of a channel, it assigns it with
a unique rpmsg address (a 32 bits integer). This way when
inbound messages arrive to this address, the rpmsg core
dispatches them to the listening entity (a kernel driver).
This sysfs entry contains the src (local) rpmsg address
of this channel. If it contains 0xffffffff, then an address
wasn't assigned (can happen if no driver exists for this
channel).
What: /sys/bus/rpmsg/devices/.../dst
Date: June 2011
KernelVersion: 3.3
Contact: Ohad Ben-Cohen <ohad@wizery.com>
Description:
Every rpmsg device is a communication channel with a remote
processor. Channels have a local ("source") rpmsg address,
and remote ("destination") rpmsg address. When an entity
starts listening on one end of a channel, it assigns it with
a unique rpmsg address (a 32 bits integer). This way when
inbound messages arrive to this address, the rpmsg core
dispatches them to the listening entity.
This sysfs entry contains the dst (remote) rpmsg address
of this channel. If it contains 0xffffffff, then an address
wasn't assigned (can happen if the kernel driver that
is attached to this channel is exposing a service to the
remote processor. This make it a local rpmsg server,
and it is listening for inbound messages that may be sent
from any remote rpmsg client; it is not bound to a single
remote entity).
What: /sys/bus/rpmsg/devices/.../announce
Date: June 2011
KernelVersion: 3.3
Contact: Ohad Ben-Cohen <ohad@wizery.com>
Description:
Every rpmsg device is a communication channel with a remote
processor. Channels are identified by a textual name (see
/sys/bus/rpmsg/devices/.../name above) and have a local
("source") rpmsg address, and remote ("destination") rpmsg
address.
A channel is first created when an entity, whether local
or remote, starts listening on it for messages (and is thus
called an rpmsg server).
When that happens, a "name service" announcement is sent
to the other processor, in order to let it know about the
creation of the channel (this way remote clients know they
can start sending messages).
This sysfs entry tells us whether the channel is a local
server channel that is announced (values are either
true or false).
This diff is collapsed.
This diff is collapsed.
...@@ -5550,6 +5550,13 @@ S: Supported ...@@ -5550,6 +5550,13 @@ S: Supported
F: drivers/base/regmap/ F: drivers/base/regmap/
F: include/linux/regmap.h F: include/linux/regmap.h
REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM
M: Ohad Ben-Cohen <ohad@wizery.com>
S: Maintained
F: drivers/remoteproc/
F: Documentation/remoteproc.txt
F: include/linux/remoteproc.txt
RFKILL RFKILL
M: Johannes Berg <johannes@sipsolutions.net> M: Johannes Berg <johannes@sipsolutions.net>
L: linux-wireless@vger.kernel.org L: linux-wireless@vger.kernel.org
......
/*
* Remote Processor - omap-specific bits
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
*
* 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.
*/
#ifndef _PLAT_REMOTEPROC_H
#define _PLAT_REMOTEPROC_H
struct rproc_ops;
struct platform_device;
/*
* struct omap_rproc_pdata - omap remoteproc's platform data
* @name: the remoteproc's name
* @oh_name: omap hwmod device
* @oh_name_opt: optional, secondary omap hwmod device
* @firmware: name of firmware file to load
* @mbox_name: name of omap mailbox device to use with this rproc
* @ops: start/stop rproc handlers
* @device_enable: omap-specific handler for enabling a device
* @device_shutdown: omap-specific handler for shutting down a device
*/
struct omap_rproc_pdata {
const char *name;
const char *oh_name;
const char *oh_name_opt;
const char *firmware;
const char *mbox_name;
const struct rproc_ops *ops;
int (*device_enable) (struct platform_device *pdev);
int (*device_shutdown) (struct platform_device *pdev);
};
#if defined(CONFIG_OMAP_REMOTEPROC) || defined(CONFIG_OMAP_REMOTEPROC_MODULE)
void __init omap_rproc_reserve_cma(void);
#else
void __init omap_rproc_reserve_cma(void)
{
}
#endif
#endif /* _PLAT_REMOTEPROC_H */
...@@ -132,6 +132,10 @@ source "drivers/clocksource/Kconfig" ...@@ -132,6 +132,10 @@ source "drivers/clocksource/Kconfig"
source "drivers/iommu/Kconfig" source "drivers/iommu/Kconfig"
source "drivers/remoteproc/Kconfig"
source "drivers/rpmsg/Kconfig"
source "drivers/virt/Kconfig" source "drivers/virt/Kconfig"
source "drivers/devfreq/Kconfig" source "drivers/devfreq/Kconfig"
......
...@@ -126,6 +126,8 @@ obj-y += clk/ ...@@ -126,6 +126,8 @@ obj-y += clk/
obj-$(CONFIG_HWSPINLOCK) += hwspinlock/ obj-$(CONFIG_HWSPINLOCK) += hwspinlock/
obj-$(CONFIG_NFC) += nfc/ obj-$(CONFIG_NFC) += nfc/
obj-$(CONFIG_IOMMU_SUPPORT) += iommu/ obj-$(CONFIG_IOMMU_SUPPORT) += iommu/
obj-$(CONFIG_REMOTEPROC) += remoteproc/
obj-$(CONFIG_RPMSG) += rpmsg/
# Virtualization drivers # Virtualization drivers
obj-$(CONFIG_VIRT_DRIVERS) += virt/ obj-$(CONFIG_VIRT_DRIVERS) += virt/
......
menu "Remoteproc drivers (EXPERIMENTAL)"
# REMOTEPROC gets selected by whoever wants it
config REMOTEPROC
tristate
depends on EXPERIMENTAL
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.
endmenu
#
# Generic framework for controlling remote processors
#
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
/*
* 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,
},
};
module_platform_driver(omap_rproc_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("OMAP Remote Processor control driver");
/*
* 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 */
This diff is collapsed.
/*
* Remote Processor Framework
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
*
* Ohad Ben-Cohen <ohad@wizery.com>
* Mark Grosen <mgrosen@ti.com>
* Brian Swetland <swetland@google.com>
* Fernando Guzman Lugo <fernando.lugo@ti.com>
* Suman Anna <s-anna@ti.com>
* Robert Tivy <rtivy@ti.com>
* Armando Uribe De Leon <x0095078@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.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/kernel.h>
#include <linux/debugfs.h>
#include <linux/remoteproc.h>
#include <linux/device.h>
/* remoteproc debugfs parent dir */
static struct dentry *rproc_dbg;
/*
* Some remote processors may support dumping trace logs into a shared
* memory buffer. We expose this trace buffer using debugfs, so users
* can easily tell what's going on remotely.
*
* We will most probably improve the rproc tracing facilities later on,
* but this kind of lightweight and simple mechanism is always good to have,
* as it provides very early tracing with little to no dependencies at all.
*/
static ssize_t rproc_trace_read(struct file *filp, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct rproc_mem_entry *trace = filp->private_data;
int len = strnlen(trace->va, trace->len);
return simple_read_from_buffer(userbuf, count, ppos, trace->va, len);
}
static int rproc_open_generic(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static const struct file_operations trace_rproc_ops = {
.read = rproc_trace_read,
.open = rproc_open_generic,
.llseek = generic_file_llseek,
};
/*
* A state-to-string lookup table, for exposing a human readable state
* via debugfs. Always keep in sync with enum rproc_state
*/
static const char * const rproc_state_string[] = {
"offline",
"suspended",
"running",
"crashed",
"invalid",
};
/* expose the state of the remote processor via debugfs */
static ssize_t rproc_state_read(struct file *filp, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct rproc *rproc = filp->private_data;
unsigned int state;
char buf[30];
int i;
state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state;
i = snprintf(buf, 30, "%.28s (%d)\n", rproc_state_string[state],
rproc->state);
return simple_read_from_buffer(userbuf, count, ppos, buf, i);
}
static const struct file_operations rproc_state_ops = {
.read = rproc_state_read,
.open = rproc_open_generic,
.llseek = generic_file_llseek,
};
/* expose the name of the remote processor via debugfs */
static ssize_t rproc_name_read(struct file *filp, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct rproc *rproc = filp->private_data;
/* need room for the name, a newline and a terminating null */
char buf[100];
int i;
i = snprintf(buf, sizeof(buf), "%.98s\n", rproc->name);
return simple_read_from_buffer(userbuf, count, ppos, buf, i);
}
static const struct file_operations rproc_name_ops = {
.read = rproc_name_read,
.open = rproc_open_generic,
.llseek = generic_file_llseek,
};
void rproc_remove_trace_file(struct dentry *tfile)
{
debugfs_remove(tfile);
}
struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
struct rproc_mem_entry *trace)
{
struct dentry *tfile;
tfile = debugfs_create_file(name, 0400, rproc->dbg_dir,
trace, &trace_rproc_ops);
if (!tfile) {
dev_err(rproc->dev, "failed to create debugfs trace entry\n");
return NULL;
}
return tfile;
}
void rproc_delete_debug_dir(struct rproc *rproc)
{
if (!rproc->dbg_dir)
return;
debugfs_remove_recursive(rproc->dbg_dir);
}
void rproc_create_debug_dir(struct rproc *rproc)
{
struct device *dev = rproc->dev;
if (!rproc_dbg)
return;
rproc->dbg_dir = debugfs_create_dir(dev_name(dev), rproc_dbg);
if (!rproc->dbg_dir)
return;
debugfs_create_file("name", 0400, rproc->dbg_dir,
rproc, &rproc_name_ops);
debugfs_create_file("state", 0400, rproc->dbg_dir,
rproc, &rproc_state_ops);
}
void __init rproc_init_debugfs(void)
{
if (debugfs_initialized()) {
rproc_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
if (!rproc_dbg)
pr_err("can't create debugfs dir\n");
}
}
void __exit rproc_exit_debugfs(void)
{
if (rproc_dbg)
debugfs_remove(rproc_dbg);
}
/*
* Remote processor framework
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
*
* Ohad Ben-Cohen <ohad@wizery.com>
* Brian Swetland <swetland@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#ifndef REMOTEPROC_INTERNAL_H
#define REMOTEPROC_INTERNAL_H
#include <linux/irqreturn.h>
struct rproc;
/* from remoteproc_core.c */
void rproc_release(struct kref *kref);
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
/* from remoteproc_rpmsg.c */
int rproc_add_rpmsg_vdev(struct rproc *);
void rproc_remove_rpmsg_vdev(struct rproc *rproc);
/* from remoteproc_debugfs.c */
void rproc_remove_trace_file(struct dentry *tfile);
struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
struct rproc_mem_entry *trace);
void rproc_delete_debug_dir(struct rproc *rproc);
void rproc_create_debug_dir(struct rproc *rproc);
void rproc_init_debugfs(void);
void rproc_exit_debugfs(void);
#endif /* REMOTEPROC_INTERNAL_H */
/*
* Remote processor messaging transport (OMAP platform-specific bits)
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
*
* Ohad Ben-Cohen <ohad@wizery.com>
* Brian Swetland <swetland@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/export.h>
#include <linux/remoteproc.h>
#include <linux/rpmsg.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_ring.h>
#include <linux/err.h>
#include <linux/kref.h>
#include <linux/slab.h>
#include "remoteproc_internal.h"
/**
* struct rproc_virtio_vq_info - virtqueue state
* @vq_id: a unique index of this virtqueue (unique for this @rproc)
* @rproc: handle to the remote processor
*
* Such a struct will be maintained for every virtqueue we're
* using to communicate with the remote processor
*/
struct rproc_virtio_vq_info {
__u16 vq_id;
struct rproc *rproc;
};
/* kick the remote processor, and let it know which virtqueue to poke at */
static void rproc_virtio_notify(struct virtqueue *vq)
{
struct rproc_virtio_vq_info *rpvq = vq->priv;
struct rproc *rproc = rpvq->rproc;
dev_dbg(rproc->dev, "kicking vq id: %d\n", rpvq->vq_id);
rproc->ops->kick(rproc, rpvq->vq_id);
}
/**
* rproc_vq_interrupt() - tell remoteproc that a virtqueue is interrupted
* @rproc: handle to the remote processor
* @vq_id: index of the signalled virtqueue
*
* This function should be called by the platform-specific rproc driver,
* when the remote processor signals that a specific virtqueue has pending
* messages available.
*
* Returns IRQ_NONE if no message was found in the @vq_id virtqueue,
* and otherwise returns IRQ_HANDLED.
*/
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id)
{
return vring_interrupt(0, rproc->rvdev->vq[vq_id]);
}
EXPORT_SYMBOL(rproc_vq_interrupt);
static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
unsigned id,
void (*callback)(struct virtqueue *vq),
const char *name)
{
struct rproc *rproc = vdev_to_rproc(vdev);
struct rproc_vdev *rvdev = rproc->rvdev;
struct rproc_virtio_vq_info *rpvq;
struct virtqueue *vq;
void *addr;
int ret, len;
rpvq = kmalloc(sizeof(*rpvq), GFP_KERNEL);
if (!rpvq)
return ERR_PTR(-ENOMEM);
rpvq->rproc = rproc;
rpvq->vq_id = id;
addr = rvdev->vring[id].va;
len = rvdev->vring[id].len;
dev_dbg(rproc->dev, "vring%d: va %p qsz %d\n", id, addr, len);
/*
* Create the new vq, and tell virtio we're not interested in
* the 'weak' smp barriers, since we're talking with a real device.
*/
vq = vring_new_virtqueue(len, AMP_VRING_ALIGN, vdev, false, addr,
rproc_virtio_notify, callback, name);
if (!vq) {
dev_err(rproc->dev, "vring_new_virtqueue %s failed\n", name);
ret = -ENOMEM;
goto free_rpvq;
}
rvdev->vq[id] = vq;
vq->priv = rpvq;
return vq;
free_rpvq:
kfree(rpvq);
return ERR_PTR(ret);
}
static void rproc_virtio_del_vqs(struct virtio_device *vdev)
{
struct virtqueue *vq, *n;
struct rproc *rproc = vdev_to_rproc(vdev);
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
struct rproc_virtio_vq_info *rpvq = vq->priv;
vring_del_virtqueue(vq);
kfree(rpvq);
}
/* power down the remote processor */
rproc_shutdown(rproc);
}
static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char *names[])
{
struct rproc *rproc = vdev_to_rproc(vdev);
int i, ret;
/* we maintain two virtqueues per remote processor (for RX and TX) */
if (nvqs != 2)
return -EINVAL;
/* boot the remote processor */
ret = rproc_boot(rproc);
if (ret) {
dev_err(rproc->dev, "rproc_boot() failed %d\n", ret);
goto error;
}
for (i = 0; i < nvqs; ++i) {
vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i]);
if (IS_ERR(vqs[i])) {
ret = PTR_ERR(vqs[i]);
goto error;
}
}
return 0;
error:
rproc_virtio_del_vqs(vdev);
return ret;
}
/*
* We don't support yet real virtio status semantics.
*
* The plan is to provide this via the VIRTIO HDR resource entry
* which is part of the firmware: this way the remote processor
* will be able to access the status values as set by us.
*/
static u8 rproc_virtio_get_status(struct virtio_device *vdev)
{
return 0;
}
static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
{
dev_dbg(&vdev->dev, "new status: %d\n", status);
}
static void rproc_virtio_reset(struct virtio_device *vdev)
{
dev_dbg(&vdev->dev, "reset !\n");
}
/* provide the vdev features as retrieved from the firmware */
static u32 rproc_virtio_get_features(struct virtio_device *vdev)
{
struct rproc *rproc = vdev_to_rproc(vdev);
/* we only support a single vdev device for now */
return rproc->rvdev->dfeatures;
}
static void rproc_virtio_finalize_features(struct virtio_device *vdev)
{
struct rproc *rproc = vdev_to_rproc(vdev);
/* Give virtio_ring a chance to accept features */
vring_transport_features(vdev);
/*
* Remember the finalized features of our vdev, and provide it
* to the remote processor once it is powered on.
*
* Similarly to the status field, we don't expose yet the negotiated
* features to the remote processors at this point. This will be
* fixed as part of a small resource table overhaul and then an
* extension of the virtio resource entries.
*/
rproc->rvdev->gfeatures = vdev->features[0];
}
static struct virtio_config_ops rproc_virtio_config_ops = {
.get_features = rproc_virtio_get_features,
.finalize_features = rproc_virtio_finalize_features,
.find_vqs = rproc_virtio_find_vqs,
.del_vqs = rproc_virtio_del_vqs,
.reset = rproc_virtio_reset,
.set_status = rproc_virtio_set_status,
.get_status = rproc_virtio_get_status,
};
/*
* This function is called whenever vdev is released, and is responsible
* to decrement the remote processor's refcount taken when vdev was
* added.
*
* Never call this function directly; it will be called by the driver
* core when needed.
*/
static void rproc_vdev_release(struct device *dev)
{
struct virtio_device *vdev = dev_to_virtio(dev);
struct rproc *rproc = vdev_to_rproc(vdev);
kref_put(&rproc->refcount, rproc_release);
}
/**
* rproc_add_rpmsg_vdev() - create an rpmsg virtio device
* @rproc: the rproc handle
*
* This function is called if virtio rpmsg support was found in the
* firmware of the remote processor.
*
* Today we only support creating a single rpmsg vdev (virtio device),
* but the plan is to remove this limitation. At that point this interface
* will be revised/extended.
*/
int rproc_add_rpmsg_vdev(struct rproc *rproc)
{
struct device *dev = rproc->dev;
struct rproc_vdev *rvdev = rproc->rvdev;
int ret;
rvdev->vdev.id.device = VIRTIO_ID_RPMSG,
rvdev->vdev.config = &rproc_virtio_config_ops,
rvdev->vdev.dev.parent = dev;
rvdev->vdev.dev.release = rproc_vdev_release;
/*
* We're indirectly making a non-temporary copy of the rproc pointer
* here, because drivers probed with this vdev will indirectly
* access the wrapping rproc.
*
* Therefore we must increment the rproc refcount here, and decrement
* it _only_ when the vdev is released.
*/
kref_get(&rproc->refcount);
ret = register_virtio_device(&rvdev->vdev);
if (ret) {
kref_put(&rproc->refcount, rproc_release);
dev_err(dev, "failed to register vdev: %d\n", ret);
}
return ret;
}
/**
* rproc_remove_rpmsg_vdev() - remove an rpmsg vdev device
* @rproc: the rproc handle
*
* This function is called whenever @rproc is removed _iff_ an rpmsg
* vdev was created beforehand.
*/
void rproc_remove_rpmsg_vdev(struct rproc *rproc)
{
struct rproc_vdev *rvdev = rproc->rvdev;
unregister_virtio_device(&rvdev->vdev);
}
menu "Rpmsg drivers (EXPERIMENTAL)"
# RPMSG always gets selected by whoever wants it
config RPMSG
tristate
select VIRTIO
select VIRTIO_RING
depends on EXPERIMENTAL
endmenu
obj-$(CONFIG_RPMSG) += virtio_rpmsg_bus.o
This diff is collapsed.
...@@ -414,6 +414,15 @@ struct hv_vmbus_device_id { ...@@ -414,6 +414,15 @@ struct hv_vmbus_device_id {
__attribute__((aligned(sizeof(kernel_ulong_t)))); __attribute__((aligned(sizeof(kernel_ulong_t))));
}; };
/* rpmsg */
#define RPMSG_NAME_SIZE 32
#define RPMSG_DEVICE_MODALIAS_FMT "rpmsg:%s"
struct rpmsg_device_id {
char name[RPMSG_NAME_SIZE];
};
/* i2c */ /* i2c */
#define I2C_NAME_SIZE 20 #define I2C_NAME_SIZE 20
......
/*
* Remote Processor Framework
*
* 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 REMOTEPROC_H
#define REMOTEPROC_H
#include <linux/types.h>
#include <linux/kref.h>
#include <linux/klist.h>
#include <linux/mutex.h>
#include <linux/virtio.h>
#include <linux/completion.h>
/*
* The alignment between the consumer and producer parts of the vring.
* Note: this is part of the "wire" protocol. If you change this, you need
* to update your peers too.
*/
#define AMP_VRING_ALIGN (4096)
/**
* struct fw_resource - describes an entry from the resource section
* @type: resource type
* @id: index number of the resource
* @da: device address of the resource
* @pa: physical address of the resource
* @len: size, in bytes, of the resource
* @flags: properties of the resource, e.g. iommu protection required
* @reserved: must be 0 atm
* @name: name of resource
*
* The remote processor firmware should contain a "resource table":
* array of 'struct fw_resource' entries.
*
* Some resources entries are mere announcements, where the host is informed
* of specific remoteproc configuration. Other entries require the host to
* do something (e.g. reserve a requested resource) and possibly also reply
* by overwriting a member inside 'struct fw_resource' with info about the
* allocated resource.
*
* Different resource entries use different members of this struct,
* with different meanings. This is pretty limiting and error-prone,
* so the plan is to move to variable-length TLV-based resource entries,
* where each resource type will have its own structure.
*/
struct fw_resource {
u32 type;
u32 id;
u64 da;
u64 pa;
u32 len;
u32 flags;
u8 reserved[16];
u8 name[48];
} __packed;
/**
* enum fw_resource_type - types of resource entries
*
* @RSC_CARVEOUT: request for allocation of a physically contiguous
* memory region.
* @RSC_DEVMEM: request to iommu_map a memory-based peripheral.
* @RSC_TRACE: announces the availability of a trace buffer into which
* the remote processor will be writing logs. In this case,
* 'da' indicates the device address where logs are written to,
* and 'len' is the size of the trace buffer.
* @RSC_VRING: request for allocation of a virtio vring (address should
* be indicated in 'da', and 'len' should contain the number
* of buffers supported by the vring).
* @RSC_VIRTIO_DEV: this entry declares about support for a virtio device,
* and serves as the virtio header. 'da' holds the
* the virtio device features, 'pa' holds the virtio guest
* features, 'len' holds the virtio status, and 'flags' holds
* the virtio id (currently only VIRTIO_ID_RPMSG is supported).
* @RSC_LAST: just keep this one at the end
*
* Most of the resource entries share the basic idea of address/length
* negotiation with the host: the firmware usually asks (on behalf of the
* remote processor that will soon be booted with it) for memory
* of size 'len' bytes, and the host needs to allocate it and provide
* the device/physical address (when relevant) in 'da'/'pa' respectively.
*
* If the firmware is compiled with hard coded device addresses, and
* can't handle dynamically allocated 'da' values, then the 'da' field
* will contain the expected device addresses (today we actually only support
* this scheme, as there aren't yet any use cases for dynamically allocated
* device addresses).
*
* Please note that these values are used as indices to the rproc_handle_rsc
* lookup table, so please keep them sane. Moreover, @RSC_LAST is used to
* check the validity of an index before the lookup table is accessed, so
* please update it as needed.
*/
enum fw_resource_type {
RSC_CARVEOUT = 0,
RSC_DEVMEM = 1,
RSC_TRACE = 2,
RSC_VRING = 3,
RSC_VIRTIO_DEV = 4,
RSC_LAST = 5,
};
/**
* struct rproc_mem_entry - memory entry descriptor
* @va: virtual address
* @dma: dma address
* @len: length, in bytes
* @da: device address
* @priv: associated data
* @node: list node
*/
struct rproc_mem_entry {
void *va;
dma_addr_t dma;
int len;
u64 da;
void *priv;
struct list_head node;
};
struct rproc;
/**
* struct rproc_ops - platform-specific device handlers
* @start: power on the device and boot it
* @stop: power off the device
* @kick: kick a virtqueue (virtqueue id given as a parameter)
*/
struct rproc_ops {
int (*start)(struct rproc *rproc);
int (*stop)(struct rproc *rproc);
void (*kick)(struct rproc *rproc, int vqid);
};
/**
* enum rproc_state - remote processor states
* @RPROC_OFFLINE: device is powered off
* @RPROC_SUSPENDED: device is suspended; needs to be woken up to receive
* a message.
* @RPROC_RUNNING: device is up and running
* @RPROC_CRASHED: device has crashed; need to start recovery
* @RPROC_LAST: just keep this one at the end
*
* Please note that the values of these states are used as indices
* to rproc_state_string, a state-to-name lookup table,
* so please keep the two synchronized. @RPROC_LAST is used to check
* the validity of an index before the lookup table is accessed, so
* please update it as needed too.
*/
enum rproc_state {
RPROC_OFFLINE = 0,
RPROC_SUSPENDED = 1,
RPROC_RUNNING = 2,
RPROC_CRASHED = 3,
RPROC_LAST = 4,
};
/**
* struct rproc - represents a physical remote processor device
* @node: klist node of this rproc object
* @domain: iommu domain
* @name: human readable name of the rproc
* @firmware: name of firmware file to be loaded
* @priv: private data which belongs to the platform-specific rproc module
* @ops: platform-specific start/stop rproc handlers
* @dev: underlying device
* @refcount: refcount of users that have a valid pointer to this rproc
* @power: refcount of users who need this rproc powered up
* @state: state of the device
* @lock: lock which protects concurrent manipulations of the rproc
* @dbg_dir: debugfs directory of this rproc device
* @traces: list of trace buffers
* @num_traces: number of trace buffers
* @carveouts: list of physically contiguous memory allocations
* @mappings: list of iommu mappings we initiated, needed on shutdown
* @firmware_loading_complete: marks e/o asynchronous firmware loading
* @bootaddr: address of first instruction to boot rproc with (optional)
* @rvdev: virtio device (we only support a single rpmsg virtio device for now)
*/
struct rproc {
struct klist_node node;
struct iommu_domain *domain;
const char *name;
const char *firmware;
void *priv;
const struct rproc_ops *ops;
struct device *dev;
struct kref refcount;
atomic_t power;
unsigned int state;
struct mutex lock;
struct dentry *dbg_dir;
struct list_head traces;
int num_traces;
struct list_head carveouts;
struct list_head mappings;
struct completion firmware_loading_complete;
u64 bootaddr;
struct rproc_vdev *rvdev;
};
/**
* struct rproc_vdev - remoteproc state for a supported virtio device
* @rproc: the rproc handle
* @vdev: the virio device
* @vq: the virtqueues for this vdev
* @vring: the vrings for this vdev
* @dfeatures: virtio device features
* @gfeatures: virtio guest features
*/
struct rproc_vdev {
struct rproc *rproc;
struct virtio_device vdev;
struct virtqueue *vq[2];
struct rproc_mem_entry vring[2];
unsigned long dfeatures;
unsigned long gfeatures;
};
struct rproc *rproc_get_by_name(const char *name);
void rproc_put(struct rproc *rproc);
struct rproc *rproc_alloc(struct device *dev, const char *name,
const struct rproc_ops *ops,
const char *firmware, int len);
void rproc_free(struct rproc *rproc);
int rproc_register(struct rproc *rproc);
int rproc_unregister(struct rproc *rproc);
int rproc_boot(struct rproc *rproc);
void rproc_shutdown(struct rproc *rproc);
static inline struct rproc *vdev_to_rproc(struct virtio_device *vdev)
{
struct rproc_vdev *rvdev = container_of(vdev, struct rproc_vdev, vdev);
return rvdev->rproc;
}
#endif /* REMOTEPROC_H */
This diff is collapsed.
...@@ -34,6 +34,7 @@ ...@@ -34,6 +34,7 @@
#define VIRTIO_ID_CONSOLE 3 /* virtio console */ #define VIRTIO_ID_CONSOLE 3 /* virtio console */
#define VIRTIO_ID_RNG 4 /* virtio ring */ #define VIRTIO_ID_RNG 4 /* virtio ring */
#define VIRTIO_ID_BALLOON 5 /* virtio balloon */ #define VIRTIO_ID_BALLOON 5 /* virtio balloon */
#define VIRTIO_ID_RPMSG 7 /* virtio remote processor messaging */
#define VIRTIO_ID_9P 9 /* 9p virtio console */ #define VIRTIO_ID_9P 9 /* 9p virtio console */
#endif /* _LINUX_VIRTIO_IDS_H */ #endif /* _LINUX_VIRTIO_IDS_H */
...@@ -61,4 +61,12 @@ config SAMPLE_KDB ...@@ -61,4 +61,12 @@ config SAMPLE_KDB
Build an example of how to dynamically add the hello Build an example of how to dynamically add the hello
command to the kdb shell. command to the kdb shell.
config SAMPLE_RPMSG_CLIENT
tristate "Build rpmsg client sample -- loadable modules only"
depends on RPMSG && m
help
Build an rpmsg client sample driver, which demonstrates how
to communicate with an AMP-configured remote processor over
the rpmsg bus.
endif # SAMPLES endif # SAMPLES
# Makefile for Linux samples code # Makefile for Linux samples code
obj-$(CONFIG_SAMPLES) += kobject/ kprobes/ tracepoints/ trace_events/ \ obj-$(CONFIG_SAMPLES) += kobject/ kprobes/ tracepoints/ trace_events/ \
hw_breakpoint/ kfifo/ kdb/ hidraw/ hw_breakpoint/ kfifo/ kdb/ hidraw/ rpmsg/
obj-$(CONFIG_SAMPLE_RPMSG_CLIENT) += rpmsg_client_sample.o
/*
* Remote processor messaging - sample client driver
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
*
* Ohad Ben-Cohen <ohad@wizery.com>
* Brian Swetland <swetland@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/rpmsg.h>
#define MSG "hello world!"
#define MSG_LIMIT 100
static void rpmsg_sample_cb(struct rpmsg_channel *rpdev, void *data, int len,
void *priv, u32 src)
{
int ret;
static int rx_count;
dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n", ++rx_count, src);
print_hex_dump(KERN_DEBUG, __func__, DUMP_PREFIX_NONE, 16, 1,
data, len, true);
/* samples should not live forever */
if (rx_count >= MSG_LIMIT) {
dev_info(&rpdev->dev, "goodbye!\n");
return;
}
/* send a new message now */
ret = rpmsg_send(rpdev, MSG, strlen(MSG));
if (ret)
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
}
static int rpmsg_sample_probe(struct rpmsg_channel *rpdev)
{
int ret;
dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
rpdev->src, rpdev->dst);
/* send a message to our remote processor */
ret = rpmsg_send(rpdev, MSG, strlen(MSG));
if (ret) {
dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
return ret;
}
return 0;
}
static void __devexit rpmsg_sample_remove(struct rpmsg_channel *rpdev)
{
dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
}
static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
{ .name = "rpmsg-client-sample" },
{ },
};
MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
static struct rpmsg_driver rpmsg_sample_client = {
.drv.name = KBUILD_MODNAME,
.drv.owner = THIS_MODULE,
.id_table = rpmsg_driver_sample_id_table,
.probe = rpmsg_sample_probe,
.callback = rpmsg_sample_cb,
.remove = __devexit_p(rpmsg_sample_remove),
};
static int __init rpmsg_client_sample_init(void)
{
return register_rpmsg_driver(&rpmsg_sample_client);
}
module_init(rpmsg_client_sample_init);
static void __exit rpmsg_client_sample_fini(void)
{
unregister_rpmsg_driver(&rpmsg_sample_client);
}
module_exit(rpmsg_client_sample_fini);
MODULE_DESCRIPTION("Remote processor messaging sample client driver");
MODULE_LICENSE("GPL v2");
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