drivers/firmware/mtk-adsp-ipc.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/firmware/mediatek/mtk-adsp-ipc.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mailbox_client.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/slab.h>
  13
  14 static const char * const adsp_mbox_ch_names[MTK_ADSP_MBOX_NUM] = { "rx", "tx" };
  15
  16 /*
  17  * mtk_adsp_ipc_send - send ipc cmd to MTK ADSP
  18  *
  19  * @ipc: ADSP IPC handle
  20  * @idx: index of the mailbox channel
  21  * @msg: IPC cmd (reply or request)
  22  *
  23  * Returns zero for success from mbox_send_message
  24  * negative value for error
  25  */
  26 int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t msg)
  27 {
  28         struct mtk_adsp_chan *adsp_chan;
  29         int ret;
  30
  31         if (idx >= MTK_ADSP_MBOX_NUM)
  32                 return -EINVAL;
  33
  34         adsp_chan = &ipc->chans[idx];
  35         ret = mbox_send_message(adsp_chan->ch, &msg);
  36         if (ret < 0)
  37                 return ret;
  38
  39         return 0;
  40 }
  41 EXPORT_SYMBOL_GPL(mtk_adsp_ipc_send);
  42
  43 /*
  44  * mtk_adsp_ipc_recv - recv callback used by MTK ADSP mailbox
  45  *
  46  * @c: mbox client
  47  * @msg: message received
  48  *
  49  * Users of ADSP IPC will need to privde handle_reply and handle_request
  50  * callbacks.
  51  */
  52 static void mtk_adsp_ipc_recv(struct mbox_client *c, void *msg)
  53 {
  54         struct mtk_adsp_chan *chan = container_of(c, struct mtk_adsp_chan, cl);
  55         struct device *dev = c->dev;
  56
  57         switch (chan->idx) {
  58         case MTK_ADSP_MBOX_REPLY:
  59                 chan->ipc->ops->handle_reply(chan->ipc);
  60                 break;
  61         case MTK_ADSP_MBOX_REQUEST:
  62                 chan->ipc->ops->handle_request(chan->ipc);
  63                 break;
  64         default:
  65                 dev_err(dev, "wrong mbox chan %d\n", chan->idx);
  66                 break;
  67         }
  68 }
  69
  70 static int mtk_adsp_ipc_probe(struct platform_device *pdev)
  71 {
  72         struct device *dev = &pdev->dev;
  73         struct mtk_adsp_ipc *adsp_ipc;
  74         struct mtk_adsp_chan *adsp_chan;
  75         struct mbox_client *cl;
  76         int ret;
  77         int i, j;
  78
  79         device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
  80
  81         adsp_ipc = devm_kzalloc(dev, sizeof(*adsp_ipc), GFP_KERNEL);
  82         if (!adsp_ipc)
  83                 return -ENOMEM;
  84
  85         for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
  86                 adsp_chan = &adsp_ipc->chans[i];
  87                 cl = &adsp_chan->cl;
  88                 cl->dev = dev->parent;
  89                 cl->tx_block = false;
  90                 cl->knows_txdone = false;
  91                 cl->tx_prepare = NULL;
  92                 cl->rx_callback = mtk_adsp_ipc_recv;
  93
  94                 adsp_chan->ipc = adsp_ipc;
  95                 adsp_chan->idx = i;
  96                 adsp_chan->ch = mbox_request_channel_byname(cl, adsp_mbox_ch_names[i]);
  97                 if (IS_ERR(adsp_chan->ch)) {
  98                         ret = dev_err_probe(dev, PTR_ERR(adsp_chan->ch),
  99                                             "Failed to request mbox channel %s\n",
 100                                             adsp_mbox_ch_names[i]);
 101
 102                         for (j = 0; j < i; j++) {
 103                                 adsp_chan = &adsp_ipc->chans[j];
 104                                 mbox_free_channel(adsp_chan->ch);
 105                         }
 106
 107                         return ret;
 108                 }
 109         }
 110
 111         adsp_ipc->dev = dev;
 112         dev_set_drvdata(dev, adsp_ipc);
 113         dev_dbg(dev, "MTK ADSP IPC initialized\n");
 114
 115         return 0;
 116 }
 117
 118 static void mtk_adsp_ipc_remove(struct platform_device *pdev)
 119 {
 120         struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);
 121         struct mtk_adsp_chan *adsp_chan;
 122         int i;
 123
 124         for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
 125                 adsp_chan = &adsp_ipc->chans[i];
 126                 mbox_free_channel(adsp_chan->ch);
 127         }
 128 }
 129
 130 static struct platform_driver mtk_adsp_ipc_driver = {
 131         .driver = {
 132                 .name = "mtk-adsp-ipc",
 133         },
 134         .probe = mtk_adsp_ipc_probe,
 135         .remove = mtk_adsp_ipc_remove,
 136 };
 137 builtin_platform_driver(mtk_adsp_ipc_driver);
 138
 139 MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");
 140 MODULE_DESCRIPTION("MTK ADSP IPC Driver");
 141 MODULE_LICENSE("GPL");