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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2019 NXP
* Author: Daniel Baluta <daniel.baluta@nxp.com>
*
* Implementation of the DSP IPC interface (host side)
*/
#include <linux/kernel.h>
#include <linux/mailbox_controller.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "dsp.h"
/* mailbox protocol refer to sof jh7110 mailbox */
#define JH7110_SOF_MAILBOX_HOST_REQUEST_MSG_DATA 0x02
#define JH7110_SOF_MAILBOX_HOST_REPLY_MSG_DATA 0x20
#define JH7110_SOF_MAILBOX_DSP_REQUEST_MSG_DATA 0x01
#define JH7110_SOF_MAILBOX_DSP_REPLY_MSG_DATA 0x10
/*
* jh7110_dsp_ring_doorbell - triggers an interrupt on the other side (DSP)
*
* @dsp: DSP IPC handle
* @chan_idx: index of the channel where to trigger the interrupt
*
* Returns non-negative value for success, negative value for error
*/
int jh7110_dsp_ring_doorbell(struct jh7110_dsp_ipc *ipc, unsigned int is_ack)
{
int ret;
struct jh7110_dsp_chan *dsp_chan;
u32 msg = 0x02;
dev_dbg(ipc->dev, "dsp ring doorbell for %s",
(is_ack == 0) ? "request" : "ack reply");
msg = (is_ack == 0) ? JH7110_SOF_MAILBOX_HOST_REQUEST_MSG_DATA : JH7110_SOF_MAILBOX_HOST_REPLY_MSG_DATA;
dsp_chan = &ipc->chans[0];
ret = mbox_send_message(dsp_chan->ch, (void *)&msg);
mbox_chan_txdone(dsp_chan->ch, ret);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL(jh7110_dsp_ring_doorbell);
static void jh7110_dsp_handle_rx_work_func(struct work_struct *work)
{
struct jh7110_dsp_rx_work *dsp_rx_work;
struct jh7110_dsp_ipc *ipc;
dsp_rx_work = container_of(work, struct jh7110_dsp_rx_work, rx_work);
if (unlikely(!dsp_rx_work))
return;
ipc = container_of(dsp_rx_work, struct jh7110_dsp_ipc, work);
if (unlikely(!ipc))
return;
dev_dbg(ipc->dev, "[%s] msg_data: 0x%x\n", __func__, dsp_rx_work->data);
if (dsp_rx_work->data & JH7110_SOF_MAILBOX_DSP_REPLY_MSG_DATA) {
ipc->ops->handle_reply(ipc);
dsp_rx_work->data &= ~JH7110_SOF_MAILBOX_DSP_REPLY_MSG_DATA;
}
if (dsp_rx_work->data & JH7110_SOF_MAILBOX_DSP_REQUEST_MSG_DATA) {
ipc->ops->handle_request(ipc);
jh7110_dsp_ring_doorbell(ipc, 1);
dsp_rx_work->data &= ~JH7110_SOF_MAILBOX_DSP_REQUEST_MSG_DATA;
}
}
/*
* jh7110_dsp_handle_rx - rx callback used by jh7110 mailbox
*
* @c: mbox client
* @msg: message received
*
* Users of DSP IPC will need to privde handle_reply and handle_request
* callbacks.
*/
static void jh7110_dsp_handle_rx(struct mbox_client *c, void *msg)
{
struct jh7110_dsp_chan *chan = container_of(c, struct jh7110_dsp_chan, cl);
u32 msg_data = *((u32 *)msg);
chan->ipc->work.data |= msg_data;
queue_work(chan->ipc->dsp_ipc_wq, &chan->ipc->work.rx_work);
}
struct mbox_chan *jh7110_dsp_request_channel(struct jh7110_dsp_ipc *dsp_ipc, int idx)
{
struct jh7110_dsp_chan *dsp_chan;
if (idx >= DSP_MU_CHAN_NUM)
return ERR_PTR(-EINVAL);
dsp_chan = &dsp_ipc->chans[idx];
dsp_chan->ch = mbox_request_channel_byname(&dsp_chan->cl, dsp_chan->name);
return dsp_chan->ch;
}
EXPORT_SYMBOL(jh7110_dsp_request_channel);
void jh7110_dsp_free_channel(struct jh7110_dsp_ipc *dsp_ipc, int idx)
{
struct jh7110_dsp_chan *dsp_chan;
if (idx >= DSP_MU_CHAN_NUM)
return;
dsp_chan = &dsp_ipc->chans[idx];
mbox_free_channel(dsp_chan->ch);
}
EXPORT_SYMBOL(jh7110_dsp_free_channel);
static int jh7110_dsp_setup_channels(struct jh7110_dsp_ipc *dsp_ipc)
{
struct device *dev = dsp_ipc->dev;
struct jh7110_dsp_chan *dsp_chan;
struct mbox_client *cl;
char *chan_name;
int ret;
int i, j;
/* 0 for tx, 1 for rx */
for (i = 0; i < DSP_MU_CHAN_NUM; i++) {
if (i == 0)
chan_name = "tx";
else
chan_name = "rx";
if (!chan_name)
return -ENOMEM;
dsp_chan = &dsp_ipc->chans[i];
dsp_chan->name = chan_name;
cl = &dsp_chan->cl;
cl->dev = dev;
cl->tx_block = false;
cl->knows_txdone = false;
cl->rx_callback = jh7110_dsp_handle_rx;
cl->tx_tout = 500;
dsp_chan->ipc = dsp_ipc;
dsp_chan->idx = i;
dsp_chan->ch = mbox_request_channel_byname(cl, chan_name);
if (IS_ERR(dsp_chan->ch)) {
ret = PTR_ERR(dsp_chan->ch);
if (ret != -EPROBE_DEFER)
dev_err(dev, "Failed to request mbox chan %s ret %d\n",
chan_name, ret);
goto out;
}
dev_dbg(dev, "request mbox chan %s\n", chan_name);
}
return 0;
out:
for (j = 0; j < i; j++) {
dsp_chan = &dsp_ipc->chans[j];
mbox_free_channel(dsp_chan->ch);
kfree(dsp_chan->name);
}
return ret;
}
static int jh7110_dsp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct jh7110_dsp_ipc *dsp_ipc;
int ret;
device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
dsp_ipc = devm_kzalloc(dev, sizeof(*dsp_ipc), GFP_KERNEL);
if (!dsp_ipc)
return -ENOMEM;
dsp_ipc->dev = dev;
dev_set_drvdata(dev, dsp_ipc);
dsp_ipc->dsp_ipc_wq = create_workqueue("dsp ipc wq");
dsp_ipc->work.data = 0;
INIT_WORK(&dsp_ipc->work.rx_work, jh7110_dsp_handle_rx_work_func);
ret = jh7110_dsp_setup_channels(dsp_ipc);
if (ret)
return ret;
dev_dbg(dev, "STARFIVE DSP IPC initialized\n");
return 0;
}
static int jh7110_dsp_remove(struct platform_device *pdev)
{
struct jh7110_dsp_chan *dsp_chan;
struct jh7110_dsp_ipc *dsp_ipc;
int i;
dsp_ipc = dev_get_drvdata(&pdev->dev);
for (i = 0; i < DSP_MU_CHAN_NUM; i++) {
dsp_chan = &dsp_ipc->chans[i];
mbox_free_channel(dsp_chan->ch);
kfree(dsp_chan->name);
}
destroy_workqueue(dsp_ipc->dsp_ipc_wq);
return 0;
}
static struct platform_driver jh7110_dsp_driver = {
.driver = {
.name = "jh7110-dsp",
},
.probe = jh7110_dsp_probe,
.remove = jh7110_dsp_remove,
};
builtin_platform_driver(jh7110_dsp_driver);
MODULE_AUTHOR("Carter Li <carter.li@starfivetech.com>");
MODULE_DESCRIPTION("STARFIVE DSP IPC protocol driver");
MODULE_LICENSE("GPL v2");
|
