1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2016, NVIDIA CORPORATION.
8 #include <mailbox-uclass.h>
12 #define SANDBOX_MBOX_CHANNELS 2
14 struct sandbox_mbox_chan {
20 struct sandbox_mbox_chan chans[SANDBOX_MBOX_CHANNELS];
23 static int sandbox_mbox_request(struct mbox_chan *chan)
25 debug("%s(chan=%p)\n", __func__, chan);
27 if (chan->id >= SANDBOX_MBOX_CHANNELS)
33 static int sandbox_mbox_free(struct mbox_chan *chan)
35 debug("%s(chan=%p)\n", __func__, chan);
40 static int sandbox_mbox_send(struct mbox_chan *chan, const void *data)
42 struct sandbox_mbox *sbm = dev_get_priv(chan->dev);
43 const uint32_t *pmsg = data;
45 debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
47 sbm->chans[chan->id].rx_msg = *pmsg ^ SANDBOX_MBOX_PING_XOR;
48 sbm->chans[chan->id].rx_msg_valid = true;
53 static int sandbox_mbox_recv(struct mbox_chan *chan, void *data)
55 struct sandbox_mbox *sbm = dev_get_priv(chan->dev);
56 uint32_t *pmsg = data;
58 debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
60 if (!sbm->chans[chan->id].rx_msg_valid)
63 *pmsg = sbm->chans[chan->id].rx_msg;
64 sbm->chans[chan->id].rx_msg_valid = false;
69 static int sandbox_mbox_bind(struct udevice *dev)
71 debug("%s(dev=%p)\n", __func__, dev);
76 static int sandbox_mbox_probe(struct udevice *dev)
78 debug("%s(dev=%p)\n", __func__, dev);
83 static const struct udevice_id sandbox_mbox_ids[] = {
84 { .compatible = "sandbox,mbox" },
88 struct mbox_ops sandbox_mbox_mbox_ops = {
89 .request = sandbox_mbox_request,
90 .free = sandbox_mbox_free,
91 .send = sandbox_mbox_send,
92 .recv = sandbox_mbox_recv,
95 U_BOOT_DRIVER(sandbox_mbox) = {
96 .name = "sandbox_mbox",
98 .of_match = sandbox_mbox_ids,
99 .bind = sandbox_mbox_bind,
100 .probe = sandbox_mbox_probe,
101 .priv_auto_alloc_size = sizeof(struct sandbox_mbox),
102 .ops = &sandbox_mbox_mbox_ops,