u-boot/drivers/mailbox/mailbox-uclass.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

138 lines
2.9 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*/
#include <common.h>
#include <dm.h>
#include <mailbox.h>
#include <mailbox-uclass.h>
static inline struct mbox_ops *mbox_dev_ops(struct udevice *dev)
{
return (struct mbox_ops *)dev->driver->ops;
}
static int mbox_of_xlate_default(struct mbox_chan *chan,
struct ofnode_phandle_args *args)
{
debug("%s(chan=%p)\n", __func__, chan);
if (args->args_count != 1) {
debug("Invaild args_count: %d\n", args->args_count);
return -EINVAL;
}
chan->id = args->args[0];
return 0;
}
int mbox_get_by_index(struct udevice *dev, int index, struct mbox_chan *chan)
{
struct ofnode_phandle_args args;
int ret;
struct udevice *dev_mbox;
struct mbox_ops *ops;
debug("%s(dev=%p, index=%d, chan=%p)\n", __func__, dev, index, chan);
ret = dev_read_phandle_with_args(dev, "mboxes", "#mbox-cells", 0, index,
&args);
if (ret) {
debug("%s: dev_read_phandle_with_args failed: %d\n", __func__,
ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_MAILBOX, args.node, &dev_mbox);
if (ret) {
debug("%s: uclass_get_device_by_of_offset failed: %d\n",
__func__, ret);
return ret;
}
ops = mbox_dev_ops(dev_mbox);
chan->dev = dev_mbox;
if (ops->of_xlate)
ret = ops->of_xlate(chan, &args);
else
ret = mbox_of_xlate_default(chan, &args);
if (ret) {
debug("of_xlate() failed: %d\n", ret);
return ret;
}
ret = ops->request(chan);
if (ret) {
debug("ops->request() failed: %d\n", ret);
return ret;
}
return 0;
}
int mbox_get_by_name(struct udevice *dev, const char *name,
struct mbox_chan *chan)
{
int index;
debug("%s(dev=%p, name=%s, chan=%p)\n", __func__, dev, name, chan);
index = dev_read_stringlist_search(dev, "mbox-names", name);
if (index < 0) {
debug("fdt_stringlist_search() failed: %d\n", index);
return index;
}
return mbox_get_by_index(dev, index, chan);
}
int mbox_free(struct mbox_chan *chan)
{
struct mbox_ops *ops = mbox_dev_ops(chan->dev);
debug("%s(chan=%p)\n", __func__, chan);
return ops->free(chan);
}
int mbox_send(struct mbox_chan *chan, const void *data)
{
struct mbox_ops *ops = mbox_dev_ops(chan->dev);
debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
return ops->send(chan, data);
}
int mbox_recv(struct mbox_chan *chan, void *data, ulong timeout_us)
{
struct mbox_ops *ops = mbox_dev_ops(chan->dev);
ulong start_time;
int ret;
debug("%s(chan=%p, data=%p, timeout_us=%ld)\n", __func__, chan, data,
timeout_us);
start_time = timer_get_us();
/*
* Account for partial us ticks, but if timeout_us is 0, ensure we
* still don't wait at all.
*/
if (timeout_us)
timeout_us++;
for (;;) {
ret = ops->recv(chan, data);
if (ret != -ENODATA)
return ret;
if ((timer_get_us() - start_time) >= timeout_us)
return -ETIMEDOUT;
}
}
UCLASS_DRIVER(mailbox) = {
.id = UCLASS_MAILBOX,
.name = "mailbox",
};