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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2022 MediaTek Corporation. All rights reserved.
* Author: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
*/
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/mailbox_controller.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct mtk_adsp_mbox_priv {
struct device *dev;
struct mbox_controller mbox;
void __iomem *va_mboxreg;
const struct mtk_adsp_mbox_cfg *cfg;
};
struct mtk_adsp_mbox_cfg {
u32 set_in;
u32 set_out;
u32 clr_in;
u32 clr_out;
};
static inline struct mtk_adsp_mbox_priv *get_mtk_adsp_mbox_priv(struct mbox_controller *mbox)
{
return container_of(mbox, struct mtk_adsp_mbox_priv, mbox);
}
static irqreturn_t mtk_adsp_mbox_irq(int irq, void *data)
{
struct mbox_chan *chan = data;
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
u32 op = readl(priv->va_mboxreg + priv->cfg->set_out);
writel(op, priv->va_mboxreg + priv->cfg->clr_out);
return IRQ_WAKE_THREAD;
}
static irqreturn_t mtk_adsp_mbox_isr(int irq, void *data)
{
struct mbox_chan *chan = data;
mbox_chan_received_data(chan, NULL);
return IRQ_HANDLED;
}
static struct mbox_chan *mtk_adsp_mbox_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *sp)
{
return mbox->chans;
}
static int mtk_adsp_mbox_startup(struct mbox_chan *chan)
{
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
/* Clear ADSP mbox command */
writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in);
writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out);
return 0;
}
static void mtk_adsp_mbox_shutdown(struct mbox_chan *chan)
{
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
/* Clear ADSP mbox command */
writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in);
writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out);
}
static int mtk_adsp_mbox_send_data(struct mbox_chan *chan, void *data)
{
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
u32 *msg = data;
writel(*msg, priv->va_mboxreg + priv->cfg->set_in);
return 0;
}
static bool mtk_adsp_mbox_last_tx_done(struct mbox_chan *chan)
{
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
return readl(priv->va_mboxreg + priv->cfg->set_in) == 0;
}
static const struct mbox_chan_ops mtk_adsp_mbox_chan_ops = {
.send_data = mtk_adsp_mbox_send_data,
.startup = mtk_adsp_mbox_startup,
.shutdown = mtk_adsp_mbox_shutdown,
.last_tx_done = mtk_adsp_mbox_last_tx_done,
};
static int mtk_adsp_mbox_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_adsp_mbox_priv *priv;
const struct mtk_adsp_mbox_cfg *cfg;
struct mbox_controller *mbox;
int ret, irq;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
mbox = &priv->mbox;
mbox->dev = dev;
mbox->ops = &mtk_adsp_mbox_chan_ops;
mbox->txdone_irq = false;
mbox->txdone_poll = true;
mbox->of_xlate = mtk_adsp_mbox_xlate;
mbox->num_chans = 1;
mbox->chans = devm_kzalloc(dev, sizeof(*mbox->chans), GFP_KERNEL);
if (!mbox->chans)
return -ENOMEM;
priv->va_mboxreg = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->va_mboxreg))
return PTR_ERR(priv->va_mboxreg);
cfg = of_device_get_match_data(dev);
if (!cfg)
return -EINVAL;
priv->cfg = cfg;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, mtk_adsp_mbox_irq,
mtk_adsp_mbox_isr, IRQF_TRIGGER_NONE,
dev_name(dev), mbox->chans);
if (ret < 0)
return ret;
platform_set_drvdata(pdev, priv);
return devm_mbox_controller_register(dev, &priv->mbox);
}
static const struct mtk_adsp_mbox_cfg mt8186_adsp_mbox_cfg = {
.set_in = 0x00,
.set_out = 0x04,
.clr_in = 0x08,
.clr_out = 0x0C,
};
static const struct mtk_adsp_mbox_cfg mt8195_adsp_mbox_cfg = {
.set_in = 0x00,
.set_out = 0x1c,
.clr_in = 0x04,
.clr_out = 0x20,
};
static const struct of_device_id mtk_adsp_mbox_of_match[] = {
{ .compatible = "mediatek,mt8186-adsp-mbox", .data = &mt8186_adsp_mbox_cfg },
{ .compatible = "mediatek,mt8195-adsp-mbox", .data = &mt8195_adsp_mbox_cfg },
{},
};
MODULE_DEVICE_TABLE(of, mtk_adsp_mbox_of_match);
static struct platform_driver mtk_adsp_mbox_driver = {
.probe = mtk_adsp_mbox_probe,
.driver = {
.name = "mtk_adsp_mbox",
.of_match_table = mtk_adsp_mbox_of_match,
},
};
module_platform_driver(mtk_adsp_mbox_driver);
MODULE_AUTHOR("Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>");
MODULE_DESCRIPTION("MTK ADSP Mailbox Controller");
MODULE_LICENSE("GPL v2");
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