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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
// 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/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/mailbox_controller.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/slab.h>
struct mtk_adsp_mbox_priv {
struct device *dev;
struct mbox_controller mbox;
void __iomem *va_mboxreg;
const struct mtk_adsp_mbox_cfg *cfg;
};
struct mtk_adsp_mbox_cfg {
u32 set_in;
u32 set_out;
u32 clr_in;
u32 clr_out;
};
static inline struct mtk_adsp_mbox_priv *get_mtk_adsp_mbox_priv(struct mbox_controller *mbox)
{
return container_of(mbox, struct mtk_adsp_mbox_priv, mbox);
}
static irqreturn_t mtk_adsp_mbox_irq(int irq, void *data)
{
struct mbox_chan *chan = data;
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
u32 op = readl(priv->va_mboxreg + priv->cfg->set_out);
writel(op, priv->va_mboxreg + priv->cfg->clr_out);
return IRQ_WAKE_THREAD;
}
static irqreturn_t mtk_adsp_mbox_isr(int irq, void *data)
{
struct mbox_chan *chan = data;
mbox_chan_received_data(chan, NULL);
return IRQ_HANDLED;
}
static struct mbox_chan *mtk_adsp_mbox_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *sp)
{
return mbox->chans;
}
static int mtk_adsp_mbox_startup(struct mbox_chan *chan)
{
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
/* Clear ADSP mbox command */
writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in);
writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out);
return 0;
}
static void mtk_adsp_mbox_shutdown(struct mbox_chan *chan)
{
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
/* Clear ADSP mbox command */
writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_in);
writel(0xFFFFFFFF, priv->va_mboxreg + priv->cfg->clr_out);
}
static int mtk_adsp_mbox_send_data(struct mbox_chan *chan, void *data)
{
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
u32 *msg = data;
writel(*msg, priv->va_mboxreg + priv->cfg->set_in);
return 0;
}
static bool mtk_adsp_mbox_last_tx_done(struct mbox_chan *chan)
{
struct mtk_adsp_mbox_priv *priv = get_mtk_adsp_mbox_priv(chan->mbox);
return readl(priv->va_mboxreg + priv->cfg->set_in) == 0;
}
static const struct mbox_chan_ops mtk_adsp_mbox_chan_ops = {
.send_data = mtk_adsp_mbox_send_data,
.startup = mtk_adsp_mbox_startup,
.shutdown = mtk_adsp_mbox_shutdown,
.last_tx_done = mtk_adsp_mbox_last_tx_done,
};
static int mtk_adsp_mbox_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_adsp_mbox_priv *priv;
const struct mtk_adsp_mbox_cfg *cfg;
struct mbox_controller *mbox;
int ret, irq;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
mbox = &priv->mbox;
mbox->dev = dev;
mbox->ops = &mtk_adsp_mbox_chan_ops;
mbox->txdone_irq = false;
mbox->txdone_poll = true;
mbox->of_xlate = mtk_adsp_mbox_xlate;
mbox->num_chans = 1;
mbox->chans = devm_kzalloc(dev, sizeof(*mbox->chans), GFP_KERNEL);
if (!mbox->chans)
return -ENOMEM;
priv->va_mboxreg = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->va_mboxreg))
return PTR_ERR(priv->va_mboxreg);
cfg = of_device_get_match_data(dev);
if (!cfg)
return -EINVAL;
priv->cfg = cfg;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, mtk_adsp_mbox_irq,
mtk_adsp_mbox_isr, IRQF_TRIGGER_NONE,
dev_name(dev), mbox->chans);
if (ret < 0)
return ret;
platform_set_drvdata(pdev, priv);
return devm_mbox_controller_register(dev, &priv->mbox);
}
static const struct mtk_adsp_mbox_cfg mt8195_adsp_mbox_cfg = {
.set_in = 0x00,
.set_out = 0x1c,
.clr_in = 0x04,
.clr_out = 0x20,
};
static const struct of_device_id mtk_adsp_mbox_of_match[] = {
{ .compatible = "mediatek,mt8195-adsp-mbox", .data = &mt8195_adsp_mbox_cfg },
{},
};
MODULE_DEVICE_TABLE(of, mtk_adsp_mbox_of_match);
static struct platform_driver mtk_adsp_mbox_driver = {
.probe = mtk_adsp_mbox_probe,
.driver = {
.name = "mtk_adsp_mbox",
.of_match_table = mtk_adsp_mbox_of_match,
},
};
module_platform_driver(mtk_adsp_mbox_driver);
MODULE_AUTHOR("Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>");
MODULE_DESCRIPTION("MTK ADSP Mailbox Controller");
MODULE_LICENSE("GPL v2");
|
