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/*
* SYNCPT DISPLAY CHANNEL DRIVER
*
* Copyright (c) 2015-2017 NVIDIA Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
#include <linux/sched/clock.h>
#endif
#include <linux/tegra-ivc.h>
#include <linux/tegra-ivc-bus.h>
struct tegra_ivc_syncpt_display {
wait_queue_head_t waitq;
struct dentry *root;
struct completion echo_complete;
};
#define TEGRA_IVC_DC_SYNCPT_TIMEOUT_MS_DEFAULT 100
static int camrtc_syncpt_display_channel_echo(struct seq_file *file, void *data);
#define INIT_OPEN_FOPS(_open) { \
.open = _open, \
.read = seq_read, \
.llseek = seq_lseek, \
.release = single_release \
}
#define DEFINE_SEQ_FOPS(_fops_, _show_) \
static int _fops_ ## _open(struct inode *inode, struct file *file) \
{ \
return single_open(file, _show_, inode->i_private); \
} \
static const struct file_operations _fops_ = INIT_OPEN_FOPS(_fops_ ## _open)
static int camrtc_show_rtcpu_utils_echo(struct seq_file *file, void *data)
{
return camrtc_syncpt_display_channel_echo(file, data);
}
DEFINE_SEQ_FOPS(camrtc_dbgfs_fops_syncpt_display_channel_echo, camrtc_show_rtcpu_utils_echo);
static int camrtc_syncpt_display_debugfs_init(struct tegra_ivc_channel *ch)
{
struct tegra_ivc_syncpt_display *drvData = tegra_ivc_channel_get_drvdata(ch);
struct dentry *dir;
char const *name = "rtcpu-utils";
drvData->root = dir = debugfs_create_dir(name, NULL);
if (dir == NULL){
return -ENOMEM;
}
if (!debugfs_create_file("syncpt-echo", S_IRUGO, dir, ch, &camrtc_dbgfs_fops_syncpt_display_channel_echo)) {
return -ENOMEM;
}
return 0;
}
static void tegra_ivc_channel_syncpt_display_recv(struct tegra_ivc_channel *chan,
const void *data, size_t len)
{
struct tegra_ivc_syncpt_display *drvData = tegra_ivc_channel_get_drvdata(chan);
complete(&drvData->echo_complete);
}
static void tegra_ivc_channel_syncpt_display_notify(struct tegra_ivc_channel *chan)
{
struct tegra_ivc_syncpt_display *drvData = tegra_ivc_channel_get_drvdata(chan);
wake_up(&drvData->waitq);
while (tegra_ivc_can_read(&chan->ivc)) {
const void* data = tegra_ivc_read_get_next_frame(&chan->ivc);
int length = chan->ivc.frame_size;
tegra_ivc_channel_syncpt_display_recv(chan, data, length);
tegra_ivc_read_advance(&chan->ivc);
}
}
static int tegra_ivc_syncpt_display_channel_send(struct tegra_ivc_channel *chan,
void *req, uint32_t req_length)
{
struct tegra_ivc_syncpt_display *drvData = tegra_ivc_channel_get_drvdata(chan);
int ret = 0;
long timeout = 0;
timeout = wait_event_interruptible_timeout(drvData->waitq, tegra_ivc_can_write(&chan->ivc), timeout);
if (timeout <= 0) {
ret = timeout ?: -ETIMEDOUT;
pr_err("%s: timeout (%ldms) for writing expired.\n", __func__, timeout);
return ret;
}
ret = tegra_ivc_write(&chan->ivc, req, req_length);
if (ret < 0) {
pr_err("%s: tegra_ivc_write failed with %d.\n", __func__, ret);
return ret;
}
return 0;
}
static int tegra_ivc_syncpt_display_channel_prepare(struct tegra_ivc_channel *chan)
{
int err = 0;
err = tegra_ivc_channel_runtime_get(chan);
if (err)
tegra_ivc_channel_runtime_put(chan);
return err;
}
static void tegra_ivc_syncpt_display_channel_complete(struct tegra_ivc_channel *chan)
{
tegra_ivc_channel_runtime_put(chan);
}
static int camrtc_syncpt_display_channel_echo(struct seq_file *file, void *data)
{
struct tegra_ivc_channel *ch = file->private;
struct tegra_ivc_syncpt_display *drvData = tegra_ivc_channel_get_drvdata(ch);
int ret = 0;
u64 req = 0xDEADDEAD;
u64 sent,recv;
ret = tegra_ivc_syncpt_display_channel_prepare(ch);
if(ret)
return ret;
sent = sched_clock();
init_completion(&drvData->echo_complete);
ret = tegra_ivc_syncpt_display_channel_send(ch,&req,sizeof(req));
tegra_ivc_syncpt_display_channel_complete(ch);
if(ret) {
complete(&drvData->echo_complete);
}
else {
ret = wait_for_completion_timeout(&drvData->echo_complete, TEGRA_IVC_DC_SYNCPT_TIMEOUT_MS_DEFAULT);
}
if (ret <= 0) {
seq_printf(file,
"Syncpt channel echo timeout expired ");
} else {
recv = sched_clock();
seq_printf(file,
"roundtrip=%llu.%03llu us "
"(sent=%llu.%09llu recv=%llu.%09llu)\n",
(recv - sent) / 1000, (recv - sent) % 1000,
sent / 1000000000, sent % 1000000000,
recv / 1000000000, recv % 1000000000);
}
return ret;
}
static int tegra_ivc_channel_syncpt_display_probe(struct tegra_ivc_channel *chan)
{
struct tegra_ivc_syncpt_display *drvData = tegra_ivc_channel_get_drvdata(chan);
drvData = devm_kzalloc(&chan->dev, sizeof(*drvData), GFP_KERNEL);
if (unlikely(drvData == NULL))
return -ENOMEM;
init_waitqueue_head(&drvData->waitq);
tegra_ivc_channel_set_drvdata(chan, drvData);
return camrtc_syncpt_display_debugfs_init(chan);
}
static void tegra_ivc_channel_syncpt_display_remove(struct tegra_ivc_channel *chan)
{
struct tegra_ivc_syncpt_display *drvData = tegra_ivc_channel_get_drvdata(chan);
debugfs_remove_recursive(drvData->root);
}
static struct of_device_id tegra_ivc_channel_syncpt_display_of_match[] = {
{ .compatible = "nvidia,tegra-ivc-syncpt-disp" },
{ },
};
static const struct tegra_ivc_channel_ops tegra_ivc_channel_syncpt_display_ops = {
.probe = tegra_ivc_channel_syncpt_display_probe,
.remove = tegra_ivc_channel_syncpt_display_remove,
.notify = tegra_ivc_channel_syncpt_display_notify,
};
static struct tegra_ivc_driver tegra_ivc_channel_syncpt_display_driver = {
.driver = {
.name = "tegra-ivc-syncpt-display",
.bus = &tegra_ivc_bus_type,
.owner = THIS_MODULE,
.of_match_table = tegra_ivc_channel_syncpt_display_of_match,
},
.dev_type = &tegra_ivc_channel_type,
.ops.channel = &tegra_ivc_channel_syncpt_display_ops,
};
tegra_ivc_module_driver(tegra_ivc_channel_syncpt_display_driver);
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