60 lines
1.1 KiB
C
60 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2020-2025, Renesas Electronics Corporation.
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*/
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#include <asm/io.h>
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#include <dm.h>
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#include <linux/delay.h>
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#include <mailbox-uclass.h>
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#define COM 0x0
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#define IIR BIT(0)
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struct mfis_priv {
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void __iomem *tx_base;
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};
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static int mfis_send(struct mbox_chan *chan, const void *data)
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{
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struct mfis_priv *mfis = dev_get_priv(chan->dev);
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writel(IIR, mfis->tx_base + COM);
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/* Give the remote side some time. */
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mdelay(1);
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writel(0, mfis->tx_base + COM);
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return 0;
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}
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struct mbox_ops mfis_mbox_ops = {
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.send = mfis_send,
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};
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static int mfis_mbox_probe(struct udevice *dev)
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{
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struct mfis_priv *mbox = dev_get_priv(dev);
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mbox->tx_base = dev_read_addr_index_ptr(dev, 0);
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if (!mbox->tx_base)
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return -ENODEV;
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return 0;
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}
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static const struct udevice_id mfis_mbox_of_match[] = {
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{ .compatible = "renesas,mfis-mbox", },
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{},
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};
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U_BOOT_DRIVER(renesas_mfis) = {
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.name = "renesas-mfis",
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.id = UCLASS_MAILBOX,
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.of_match = mfis_mbox_of_match,
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.probe = mfis_mbox_probe,
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.priv_auto = sizeof(struct mfis_priv),
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.ops = &mfis_mbox_ops,
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};
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