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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/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 14static 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 ADSP18 *19 * @ipc: ADSP IPC handle20 * @idx: index of the mailbox channel21 * @msg: IPC cmd (reply or request)22 *23 * Returns zero for success from mbox_send_message24 * negative value for error25 */26int 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}41EXPORT_SYMBOL_GPL(mtk_adsp_ipc_send);42 43/*44 * mtk_adsp_ipc_recv - recv callback used by MTK ADSP mailbox45 *46 * @c: mbox client47 * @msg: message received48 *49 * Users of ADSP IPC will need to privde handle_reply and handle_request50 * callbacks.51 */52static 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 70static 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 = PTR_ERR(adsp_chan->ch);99 if (ret != -EPROBE_DEFER)100 dev_err(dev, "Failed to request mbox chan %s ret %d\n",101 adsp_mbox_ch_names[i], ret);102 103 for (j = 0; j < i; j++) {104 adsp_chan = &adsp_ipc->chans[j];105 mbox_free_channel(adsp_chan->ch);106 }107 108 return ret;109 }110 }111 112 adsp_ipc->dev = dev;113 dev_set_drvdata(dev, adsp_ipc);114 dev_dbg(dev, "MTK ADSP IPC initialized\n");115 116 return 0;117}118 119static void mtk_adsp_ipc_remove(struct platform_device *pdev)120{121 struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);122 struct mtk_adsp_chan *adsp_chan;123 int i;124 125 for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {126 adsp_chan = &adsp_ipc->chans[i];127 mbox_free_channel(adsp_chan->ch);128 }129}130 131static struct platform_driver mtk_adsp_ipc_driver = {132 .driver = {133 .name = "mtk-adsp-ipc",134 },135 .probe = mtk_adsp_ipc_probe,136 .remove_new = mtk_adsp_ipc_remove,137};138builtin_platform_driver(mtk_adsp_ipc_driver);139 140MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");141MODULE_DESCRIPTION("MTK ADSP IPC Driver");142MODULE_LICENSE("GPL");143