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brintos / linux-shallow public Read only

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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