sandbox-mbox.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*/
#include <common.h>
#include <dm.h>
#include <mailbox-uclass.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/mbox.h>
#define SANDBOX_MBOX_CHANNELS 2
struct sandbox_mbox_chan {
bool rx_msg_valid;
uint32_t rx_msg;
};
struct sandbox_mbox {
struct sandbox_mbox_chan chans[SANDBOX_MBOX_CHANNELS];
};
static int sandbox_mbox_request(struct mbox_chan *chan)
{
debug("%s(chan=%p)\n", __func__, chan);
if (chan->id >= SANDBOX_MBOX_CHANNELS)
return -EINVAL;
return 0;
}
static int sandbox_mbox_free(struct mbox_chan *chan)
{
debug("%s(chan=%p)\n", __func__, chan);
return 0;
}
static int sandbox_mbox_send(struct mbox_chan *chan, const void *data)
{
struct sandbox_mbox *sbm = dev_get_priv(chan->dev);
const uint32_t *pmsg = data;
debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
sbm->chans[chan->id].rx_msg = *pmsg ^ SANDBOX_MBOX_PING_XOR;
sbm->chans[chan->id].rx_msg_valid = true;
return 0;
}
static int sandbox_mbox_recv(struct mbox_chan *chan, void *data)
{
struct sandbox_mbox *sbm = dev_get_priv(chan->dev);
uint32_t *pmsg = data;
debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
if (!sbm->chans[chan->id].rx_msg_valid)
return -ENODATA;
*pmsg = sbm->chans[chan->id].rx_msg;
sbm->chans[chan->id].rx_msg_valid = false;
return 0;
}
static int sandbox_mbox_bind(struct udevice *dev)
{
debug("%s(dev=%p)\n", __func__, dev);
return 0;
}
static int sandbox_mbox_probe(struct udevice *dev)
{
debug("%s(dev=%p)\n", __func__, dev);
return 0;
}
static const struct udevice_id sandbox_mbox_ids[] = {
{ .compatible = "sandbox,mbox" },
{ }
};
struct mbox_ops sandbox_mbox_mbox_ops = {
.request = sandbox_mbox_request,
.rfree = sandbox_mbox_free,
.send = sandbox_mbox_send,
.recv = sandbox_mbox_recv,
};
U_BOOT_DRIVER(sandbox_mbox) = {
.name = "sandbox_mbox",
.id = UCLASS_MAILBOX,
.of_match = sandbox_mbox_ids,
.bind = sandbox_mbox_bind,
.probe = sandbox_mbox_probe,
.priv_auto_alloc_size = sizeof(struct sandbox_mbox),
.ops = &sandbox_mbox_mbox_ops,
};