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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2025 MediaTek Corporation. All rights reserved.
* Author: Jjian Zhou <jjian.zhou.@mediatek.com>
*/
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mailbox_controller.h>
#include <linux/mailbox/mtk-vcp-mailbox.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct mtk_vcp_mbox {
struct mbox_controller mbox;
void __iomem *base;
struct device *dev;
const struct mtk_vcp_mbox_cfg *cfg;
struct mtk_ipi_info ipi_recv;
struct mbox_chan chans;
};
struct mtk_vcp_mbox_cfg {
u16 set_in;
u16 clr_out;
};
static irqreturn_t mtk_vcp_mbox_irq_thread(int irq, void *data)
{
struct mtk_vcp_mbox *priv = data;
/* get irq status */
priv->ipi_recv.irq_status = readl(priv->base + priv->cfg->clr_out);
__ioread32_copy(priv->ipi_recv.msg, priv->base,
MTK_VCP_MBOX_SLOT_MAX_SIZE / 4);
mbox_chan_received_data(&priv->chans, &priv->ipi_recv);
/* clear irq status */
writel(priv->ipi_recv.irq_status, priv->base + priv->cfg->clr_out);
return IRQ_HANDLED;
}
static struct mbox_chan *mtk_vcp_mbox_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *sp)
{
if (sp->args_count)
return NULL;
return &mbox->chans[0];
}
static int mtk_vcp_mbox_send_data(struct mbox_chan *chan, void *data)
{
struct mtk_vcp_mbox *priv = chan->con_priv;
struct mtk_ipi_info *ipi_info = data;
u32 status;
if (!ipi_info->msg) {
dev_err(priv->dev, "msg buffer is NULL.\n");
return -EINVAL;
}
status = readl(priv->base + priv->cfg->set_in);
if (status & BIT(ipi_info->index)) {
dev_warn(priv->dev, "mailbox IPI %d is busy.\n", ipi_info->id);
return -EBUSY;
}
if (ipi_info->slot_ofs + ipi_info->len > MTK_VCP_MBOX_SLOT_MAX_SIZE)
return -EINVAL;
__iowrite32_copy(priv->base + ipi_info->slot_ofs, ipi_info->msg,
ipi_info->len);
writel(BIT(ipi_info->index), priv->base + priv->cfg->set_in);
return 0;
}
static bool mtk_vcp_mbox_last_tx_done(struct mbox_chan *chan)
{
struct mtk_ipi_info *ipi_info = chan->active_req;
struct mtk_vcp_mbox *priv = chan->con_priv;
return !(readl(priv->base + priv->cfg->set_in) & BIT(ipi_info->index));
}
static const struct mbox_chan_ops mtk_vcp_mbox_chan_ops = {
.send_data = mtk_vcp_mbox_send_data,
.last_tx_done = mtk_vcp_mbox_last_tx_done,
};
static int mtk_vcp_mbox_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_vcp_mbox *priv;
struct mbox_controller *mbox;
int ret, irq;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = dev;
priv->chans.con_priv = priv;
mbox = &priv->mbox;
mbox->dev = dev;
mbox->ops = &mtk_vcp_mbox_chan_ops;
mbox->txdone_irq = false;
mbox->txdone_poll = true;
mbox->of_xlate = mtk_vcp_mbox_xlate;
mbox->num_chans = 1;
mbox->chans = &priv->chans;
priv->ipi_recv.msg = devm_kzalloc(dev, MTK_VCP_MBOX_SLOT_MAX_SIZE,
GFP_KERNEL);
if (!priv->ipi_recv.msg)
return -ENOMEM;
priv->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
priv->cfg = of_device_get_match_data(dev);
if (!priv->cfg)
return -EINVAL;
platform_set_drvdata(pdev, priv);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, NULL,
mtk_vcp_mbox_irq_thread, IRQF_ONESHOT,
dev_name(dev), priv);
if (ret < 0)
return ret;
return devm_mbox_controller_register(dev, &priv->mbox);
}
static const struct mtk_vcp_mbox_cfg mt8196_cfg = {
.set_in = 0x100,
.clr_out = 0x10c,
};
static const struct of_device_id mtk_vcp_mbox_of_match[] = {
{ .compatible = "mediatek,mt8196-vcp-mbox", .data = &mt8196_cfg },
{},
};
MODULE_DEVICE_TABLE(of, mtk_vcp_mbox_of_match);
static struct platform_driver mtk_vcp_mbox_driver = {
.probe = mtk_vcp_mbox_probe,
.driver = {
.name = "mtk_vcp_mbox",
.of_match_table = mtk_vcp_mbox_of_match,
},
};
module_platform_driver(mtk_vcp_mbox_driver);
MODULE_AUTHOR("Jjian Zhou <jjian.zhou@mediatek.com>");
MODULE_DESCRIPTION("MTK VCP Mailbox Controller");
MODULE_LICENSE("GPL");
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