143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2022 MediaTek Corporation. All rights reserved.
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* Author: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
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*/
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#include <linux/firmware/mediatek/mtk-adsp-ipc.h>
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#include <linux/kernel.h>
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#include <linux/mailbox_client.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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static const char * const adsp_mbox_ch_names[MTK_ADSP_MBOX_NUM] = { "rx", "tx" };
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/*
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* mtk_adsp_ipc_send - send ipc cmd to MTK ADSP
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*
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* @ipc: ADSP IPC handle
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* @idx: index of the mailbox channel
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* @msg: IPC cmd (reply or request)
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*
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* Returns zero for success from mbox_send_message
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* negative value for error
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*/
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int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t msg)
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{
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struct mtk_adsp_chan *adsp_chan;
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int ret;
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if (idx >= MTK_ADSP_MBOX_NUM)
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return -EINVAL;
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adsp_chan = &ipc->chans[idx];
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ret = mbox_send_message(adsp_chan->ch, &msg);
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if (ret < 0)
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return ret;
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return 0;
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}
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EXPORT_SYMBOL_GPL(mtk_adsp_ipc_send);
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/*
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* mtk_adsp_ipc_recv - recv callback used by MTK ADSP mailbox
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*
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* @c: mbox client
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* @msg: message received
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*
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* Users of ADSP IPC will need to privde handle_reply and handle_request
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* callbacks.
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*/
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static void mtk_adsp_ipc_recv(struct mbox_client *c, void *msg)
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{
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struct mtk_adsp_chan *chan = container_of(c, struct mtk_adsp_chan, cl);
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struct device *dev = c->dev;
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switch (chan->idx) {
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case MTK_ADSP_MBOX_REPLY:
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chan->ipc->ops->handle_reply(chan->ipc);
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break;
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case MTK_ADSP_MBOX_REQUEST:
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chan->ipc->ops->handle_request(chan->ipc);
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break;
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default:
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dev_err(dev, "wrong mbox chan %d\n", chan->idx);
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break;
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}
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}
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static int mtk_adsp_ipc_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mtk_adsp_ipc *adsp_ipc;
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struct mtk_adsp_chan *adsp_chan;
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struct mbox_client *cl;
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int ret;
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int i, j;
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device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
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adsp_ipc = devm_kzalloc(dev, sizeof(*adsp_ipc), GFP_KERNEL);
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if (!adsp_ipc)
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return -ENOMEM;
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for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
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adsp_chan = &adsp_ipc->chans[i];
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cl = &adsp_chan->cl;
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cl->dev = dev->parent;
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cl->tx_block = false;
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cl->knows_txdone = false;
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cl->tx_prepare = NULL;
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cl->rx_callback = mtk_adsp_ipc_recv;
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adsp_chan->ipc = adsp_ipc;
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adsp_chan->idx = i;
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adsp_chan->ch = mbox_request_channel_byname(cl, adsp_mbox_ch_names[i]);
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if (IS_ERR(adsp_chan->ch)) {
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ret = PTR_ERR(adsp_chan->ch);
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "Failed to request mbox chan %s ret %d\n",
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adsp_mbox_ch_names[i], ret);
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for (j = 0; j < i; j++) {
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adsp_chan = &adsp_ipc->chans[j];
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mbox_free_channel(adsp_chan->ch);
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}
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return ret;
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}
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}
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adsp_ipc->dev = dev;
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dev_set_drvdata(dev, adsp_ipc);
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dev_dbg(dev, "MTK ADSP IPC initialized\n");
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return 0;
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}
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static void mtk_adsp_ipc_remove(struct platform_device *pdev)
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{
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struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);
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struct mtk_adsp_chan *adsp_chan;
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int i;
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for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
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adsp_chan = &adsp_ipc->chans[i];
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mbox_free_channel(adsp_chan->ch);
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}
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}
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static struct platform_driver mtk_adsp_ipc_driver = {
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.driver = {
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.name = "mtk-adsp-ipc",
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},
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.probe = mtk_adsp_ipc_probe,
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.remove_new = mtk_adsp_ipc_remove,
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};
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builtin_platform_driver(mtk_adsp_ipc_driver);
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MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");
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MODULE_DESCRIPTION("MTK ADSP IPC Driver");
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MODULE_LICENSE("GPL");
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