drivers/mailbox/mtk-adsp-mailbox.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   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
  17 struct 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
  24 struct mtk_adsp_mbox_cfg {
  25         u32 set_in;
  26         u32 set_out;
  27         u32 clr_in;
  28         u32 clr_out;
  29 };
  30
  31 static 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
  36 static 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
  47 static 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
  56 static 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
  62 static 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
  73 static 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
  82 static 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
  92 static 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
  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,
 104 };
 105
 106 static 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
 153 static 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
 160 static 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
 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 },
 170         {},
 171 };
 172 MODULE_DEVICE_TABLE(of, mtk_adsp_mbox_of_match);
 173
 174 static 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 };
 181 module_platform_driver(mtk_adsp_mbox_driver);
 182
 183 MODULE_AUTHOR("Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>");
 184 MODULE_DESCRIPTION("MTK ADSP Mailbox Controller");
 185 MODULE_LICENSE("GPL v2");