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