1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
// 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/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 void 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);
}
}
static struct platform_driver mtk_adsp_ipc_driver = {
.driver = {
.name = "mtk-adsp-ipc",
},
.probe = mtk_adsp_ipc_probe,
.remove_new = 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");
|
