1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2022 MediaTek Corporation. All rights reserved.
4 * Author: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
7 #include <linux/interrupt.h>
9 #include <linux/iopoll.h>
10 #include <linux/kernel.h>
11 #include <linux/mailbox_controller.h>
12 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
17 struct mtk_adsp_mbox_priv {
19 struct mbox_controller mbox;
20 void __iomem *va_mboxreg;
21 const struct mtk_adsp_mbox_cfg *cfg;
24 struct mtk_adsp_mbox_cfg {
31 static inline struct mtk_adsp_mbox_priv *get_mtk_adsp_mbox_priv(struct mbox_controller *mbox)
33 return container_of(mbox, struct mtk_adsp_mbox_priv, mbox);
36 static irqreturn_t mtk_adsp_mbox_irq(int irq, void *data)
38 struct mbox_chan *chan = data;
39 struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
40 u32 op = readl(priv->va_mboxreg + priv->cfg->set_out);
42 writel(op, priv->va_mboxreg + priv->cfg->clr_out);
44 return IRQ_WAKE_THREAD;
47 static irqreturn_t mtk_adsp_mbox_isr(int irq, void *data)
49 struct mbox_chan *chan = data;
51 mbox_chan_received_data(chan, NULL);
56 static struct mbox_chan *mtk_adsp_mbox_xlate(struct mbox_controller *mbox,
57 const struct of_phandle_args *sp)
62 static int mtk_adsp_mbox_startup(struct mbox_chan *chan)
64 struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
66 /* Clear ADSP mbox command */
67 writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in);
68 writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out);
73 static void mtk_adsp_mbox_shutdown(struct mbox_chan *chan)
75 struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
77 /* Clear ADSP mbox command */
78 writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in);
79 writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out);
82 static int mtk_adsp_mbox_send_data(struct mbox_chan *chan, void *data)
84 struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
87 writel(*msg, priv->va_mboxreg + priv->cfg->set_in);
92 static bool mtk_adsp_mbox_last_tx_done(struct mbox_chan *chan)
94 struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
96 return readl(priv->va_mboxreg + priv->cfg->set_in) == 0;
99 static const struct mbox_chan_ops mtk_adsp_mbox_chan_ops = {
100 .send_data = mtk_adsp_mbox_send_data,
101 .startup = mtk_adsp_mbox_startup,
102 .shutdown = mtk_adsp_mbox_shutdown,
103 .last_tx_done = mtk_adsp_mbox_last_tx_done,
106 static int mtk_adsp_mbox_probe(struct platform_device *pdev)
108 struct device *dev = &pdev->dev;
109 struct mtk_adsp_mbox_priv *priv;
110 const struct mtk_adsp_mbox_cfg *cfg;
111 struct mbox_controller *mbox;
114 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
120 mbox->ops = &mtk_adsp_mbox_chan_ops;
121 mbox->txdone_irq = false;
122 mbox->txdone_poll = true;
123 mbox->of_xlate = mtk_adsp_mbox_xlate;
125 mbox->chans = devm_kzalloc(dev, sizeof(*mbox->chans), GFP_KERNEL);
129 priv->va_mboxreg = devm_platform_ioremap_resource(pdev, 0);
130 if (IS_ERR(priv->va_mboxreg))
131 return PTR_ERR(priv->va_mboxreg);
133 cfg = of_device_get_match_data(dev);
138 irq = platform_get_irq(pdev, 0);
142 ret = devm_request_threaded_irq(dev, irq, mtk_adsp_mbox_irq,
143 mtk_adsp_mbox_isr, IRQF_TRIGGER_NONE,
144 dev_name(dev), mbox->chans);
148 platform_set_drvdata(pdev, priv);
150 return devm_mbox_controller_register(dev, &priv->mbox);
153 static const struct mtk_adsp_mbox_cfg mt8186_adsp_mbox_cfg = {
160 static const struct mtk_adsp_mbox_cfg mt8195_adsp_mbox_cfg = {
167 static const struct of_device_id mtk_adsp_mbox_of_match[] = {
168 { .compatible = "mediatek,mt8186-adsp-mbox", .data = &mt8186_adsp_mbox_cfg },
169 { .compatible = "mediatek,mt8195-adsp-mbox", .data = &mt8195_adsp_mbox_cfg },
172 MODULE_DEVICE_TABLE(of, mtk_adsp_mbox_of_match);
174 static struct platform_driver mtk_adsp_mbox_driver = {
175 .probe = mtk_adsp_mbox_probe,
177 .name = "mtk_adsp_mbox",
178 .of_match_table = mtk_adsp_mbox_of_match,
181 module_platform_driver(mtk_adsp_mbox_driver);
183 MODULE_AUTHOR("Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>");
184 MODULE_DESCRIPTION("MTK ADSP Mailbox Controller");
185 MODULE_LICENSE("GPL v2");