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1// SPDX-License-Identifier: GPL-2.0
2/*
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 ADSP
18 *
19 * @ipc: ADSP IPC handle
20 * @idx: index of the mailbox channel
21 * @msg: IPC cmd (reply or request)
22 *
23 * Returns zero for success from mbox_send_message
24 * negative value for error
25 */
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 mailbox
45 *
46 * @c: mbox client
47 * @msg: message received
48 *
49 * Users of ADSP IPC will need to privde handle_reply and handle_request
50 * 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 = dev_err_probe(dev, PTR_ERR(adsp_chan->ch),
99 "Failed to request mbox channel %s\n",
100 adsp_mbox_ch_names[i]);
101
102 for (j = 0; j < i; j++) {
103 adsp_chan = &adsp_ipc->chans[j];
104 mbox_free_channel(adsp_chan->ch);
105 }
106
107 return ret;
108 }
109 }
110
111 adsp_ipc->dev = dev;
112 dev_set_drvdata(dev, adsp_ipc);
113 dev_dbg(dev, "MTK ADSP IPC initialized\n");
114
115 return 0;
116}
117
118static void mtk_adsp_ipc_remove(struct platform_device *pdev)
119{
120 struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);
121 struct mtk_adsp_chan *adsp_chan;
122 int i;
123
124 for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
125 adsp_chan = &adsp_ipc->chans[i];
126 mbox_free_channel(adsp_chan->ch);
127 }
128}
129
130static struct platform_driver mtk_adsp_ipc_driver = {
131 .driver = {
132 .name = "mtk-adsp-ipc",
133 },
134 .probe = mtk_adsp_ipc_probe,
135 .remove = mtk_adsp_ipc_remove,
136};
137builtin_platform_driver(mtk_adsp_ipc_driver);
138
139MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");
140MODULE_DESCRIPTION("MTK ADSP IPC Driver");
141MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
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/of_platform.h>
12#include <linux/platform_device.h>
13#include <linux/slab.h>
14
15static const char * const adsp_mbox_ch_names[MTK_ADSP_MBOX_NUM] = { "rx", "tx" };
16
17/*
18 * mtk_adsp_ipc_send - send ipc cmd to MTK ADSP
19 *
20 * @ipc: ADSP IPC handle
21 * @idx: index of the mailbox channel
22 * @msg: IPC cmd (reply or request)
23 *
24 * Returns zero for success from mbox_send_message
25 * negative value for error
26 */
27int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t msg)
28{
29 struct mtk_adsp_chan *adsp_chan;
30 int ret;
31
32 if (idx >= MTK_ADSP_MBOX_NUM)
33 return -EINVAL;
34
35 adsp_chan = &ipc->chans[idx];
36 ret = mbox_send_message(adsp_chan->ch, &msg);
37 if (ret < 0)
38 return ret;
39
40 return 0;
41}
42EXPORT_SYMBOL_GPL(mtk_adsp_ipc_send);
43
44/*
45 * mtk_adsp_ipc_recv - recv callback used by MTK ADSP mailbox
46 *
47 * @c: mbox client
48 * @msg: message received
49 *
50 * Users of ADSP IPC will need to privde handle_reply and handle_request
51 * callbacks.
52 */
53static void mtk_adsp_ipc_recv(struct mbox_client *c, void *msg)
54{
55 struct mtk_adsp_chan *chan = container_of(c, struct mtk_adsp_chan, cl);
56 struct device *dev = c->dev;
57
58 switch (chan->idx) {
59 case MTK_ADSP_MBOX_REPLY:
60 chan->ipc->ops->handle_reply(chan->ipc);
61 break;
62 case MTK_ADSP_MBOX_REQUEST:
63 chan->ipc->ops->handle_request(chan->ipc);
64 break;
65 default:
66 dev_err(dev, "wrong mbox chan %d\n", chan->idx);
67 break;
68 }
69}
70
71static int mtk_adsp_ipc_probe(struct platform_device *pdev)
72{
73 struct device *dev = &pdev->dev;
74 struct mtk_adsp_ipc *adsp_ipc;
75 struct mtk_adsp_chan *adsp_chan;
76 struct mbox_client *cl;
77 int ret;
78 int i, j;
79
80 device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
81
82 adsp_ipc = devm_kzalloc(dev, sizeof(*adsp_ipc), GFP_KERNEL);
83 if (!adsp_ipc)
84 return -ENOMEM;
85
86 for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
87 adsp_chan = &adsp_ipc->chans[i];
88 cl = &adsp_chan->cl;
89 cl->dev = dev->parent;
90 cl->tx_block = false;
91 cl->knows_txdone = false;
92 cl->tx_prepare = NULL;
93 cl->rx_callback = mtk_adsp_ipc_recv;
94
95 adsp_chan->ipc = adsp_ipc;
96 adsp_chan->idx = i;
97 adsp_chan->ch = mbox_request_channel_byname(cl, adsp_mbox_ch_names[i]);
98 if (IS_ERR(adsp_chan->ch)) {
99 ret = PTR_ERR(adsp_chan->ch);
100 if (ret != -EPROBE_DEFER)
101 dev_err(dev, "Failed to request mbox chan %s ret %d\n",
102 adsp_mbox_ch_names[i], ret);
103
104 for (j = 0; j < i; j++) {
105 adsp_chan = &adsp_ipc->chans[j];
106 mbox_free_channel(adsp_chan->ch);
107 }
108
109 return ret;
110 }
111 }
112
113 adsp_ipc->dev = dev;
114 dev_set_drvdata(dev, adsp_ipc);
115 dev_dbg(dev, "MTK ADSP IPC initialized\n");
116
117 return 0;
118}
119
120static int mtk_adsp_ipc_remove(struct platform_device *pdev)
121{
122 struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);
123 struct mtk_adsp_chan *adsp_chan;
124 int i;
125
126 for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
127 adsp_chan = &adsp_ipc->chans[i];
128 mbox_free_channel(adsp_chan->ch);
129 }
130
131 return 0;
132}
133
134static struct platform_driver mtk_adsp_ipc_driver = {
135 .driver = {
136 .name = "mtk-adsp-ipc",
137 },
138 .probe = mtk_adsp_ipc_probe,
139 .remove = mtk_adsp_ipc_remove,
140};
141builtin_platform_driver(mtk_adsp_ipc_driver);
142
143MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");
144MODULE_DESCRIPTION("MTK ADSP IPC Driver");
145MODULE_LICENSE("GPL");