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