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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2022 MediaTek Corporation. All rights reserved.4 * Author: Allen-KH Cheng <allen-kh.cheng@mediatek.com>5 */6 7#include <linux/interrupt.h>8#include <linux/io.h>9#include <linux/iopoll.h>10#include <linux/kernel.h>11#include <linux/mailbox_controller.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/platform_device.h>15#include <linux/slab.h>16 17struct mtk_adsp_mbox_priv {18 struct device *dev;19 struct mbox_controller mbox;20 void __iomem *va_mboxreg;21 const struct mtk_adsp_mbox_cfg *cfg;22};23 24struct mtk_adsp_mbox_cfg {25 u32 set_in;26 u32 set_out;27 u32 clr_in;28 u32 clr_out;29};30 31static inline struct mtk_adsp_mbox_priv *get_mtk_adsp_mbox_priv(struct mbox_controller *mbox)32{33 return container_of(mbox, struct mtk_adsp_mbox_priv, mbox);34}35 36static irqreturn_t mtk_adsp_mbox_irq(int irq, void *data)37{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);41 42 writel(op, priv->va_mboxreg + priv->cfg->clr_out);43 44 return IRQ_WAKE_THREAD;45}46 47static irqreturn_t mtk_adsp_mbox_isr(int irq, void *data)48{49 struct mbox_chan *chan = data;50 51 mbox_chan_received_data(chan, NULL);52 53 return IRQ_HANDLED;54}55 56static struct mbox_chan *mtk_adsp_mbox_xlate(struct mbox_controller *mbox,57 const struct of_phandle_args *sp)58{59 return mbox->chans;60}61 62static int mtk_adsp_mbox_startup(struct mbox_chan *chan)63{64 struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);65 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);69 70 return 0;71}72 73static void mtk_adsp_mbox_shutdown(struct mbox_chan *chan)74{75 struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);76 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);80}81 82static int mtk_adsp_mbox_send_data(struct mbox_chan *chan, void *data)83{84 struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);85 u32 *msg = data;86 87 writel(*msg, priv->va_mboxreg + priv->cfg->set_in);88 89 return 0;90}91 92static bool mtk_adsp_mbox_last_tx_done(struct mbox_chan *chan)93{94 struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);95 96 return readl(priv->va_mboxreg + priv->cfg->set_in) == 0;97}98 99static 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,104};105 106static int mtk_adsp_mbox_probe(struct platform_device *pdev)107{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;112 int ret, irq;113 114 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);115 if (!priv)116 return -ENOMEM;117 118 mbox = &priv->mbox;119 mbox->dev = dev;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;124 mbox->num_chans = 1;125 mbox->chans = devm_kzalloc(dev, sizeof(*mbox->chans), GFP_KERNEL);126 if (!mbox->chans)127 return -ENOMEM;128 129 priv->va_mboxreg = devm_platform_ioremap_resource(pdev, 0);130 if (IS_ERR(priv->va_mboxreg))131 return PTR_ERR(priv->va_mboxreg);132 133 cfg = of_device_get_match_data(dev);134 if (!cfg)135 return -EINVAL;136 priv->cfg = cfg;137 138 irq = platform_get_irq(pdev, 0);139 if (irq < 0)140 return irq;141 142 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);145 if (ret < 0)146 return ret;147 148 platform_set_drvdata(pdev, priv);149 150 return devm_mbox_controller_register(dev, &priv->mbox);151}152 153static const struct mtk_adsp_mbox_cfg mt8186_adsp_mbox_cfg = {154 .set_in = 0x00,155 .set_out = 0x04,156 .clr_in = 0x08,157 .clr_out = 0x0C,158};159 160static const struct mtk_adsp_mbox_cfg mt8195_adsp_mbox_cfg = {161 .set_in = 0x00,162 .set_out = 0x1c,163 .clr_in = 0x04,164 .clr_out = 0x20,165};166 167static 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 },170 {},171};172MODULE_DEVICE_TABLE(of, mtk_adsp_mbox_of_match);173 174static struct platform_driver mtk_adsp_mbox_driver = {175 .probe = mtk_adsp_mbox_probe,176 .driver = {177 .name = "mtk_adsp_mbox",178 .of_match_table = mtk_adsp_mbox_of_match,179 },180};181module_platform_driver(mtk_adsp_mbox_driver);182 183MODULE_AUTHOR("Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>");184MODULE_DESCRIPTION("MTK ADSP Mailbox Controller");185MODULE_LICENSE("GPL v2");186