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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Platform driver for CDX bus.
*
* Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
*/
#include <linux/rpmsg.h>
#include <linux/remoteproc.h>
#include <linux/of_platform.h>
#include <linux/cdx/cdx_bus.h>
#include <linux/module.h>
#include "../cdx.h"
#include "cdx_controller.h"
#include "mcdi_functions.h"
#include "mcdi.h"
static struct rpmsg_device_id cdx_rpmsg_id_table[] = {
{ .name = "mcdi_ipc" },
{ },
};
MODULE_DEVICE_TABLE(rpmsg, cdx_rpmsg_id_table);
int cdx_rpmsg_send(struct cdx_mcdi *cdx_mcdi,
const struct cdx_dword *hdr, size_t hdr_len,
const struct cdx_dword *sdu, size_t sdu_len)
{
unsigned char *send_buf;
int ret;
send_buf = kzalloc(hdr_len + sdu_len, GFP_KERNEL);
if (!send_buf)
return -ENOMEM;
memcpy(send_buf, hdr, hdr_len);
memcpy(send_buf + hdr_len, sdu, sdu_len);
ret = rpmsg_send(cdx_mcdi->ept, send_buf, hdr_len + sdu_len);
kfree(send_buf);
return ret;
}
static int cdx_attach_to_rproc(struct platform_device *pdev)
{
struct device_node *r5_core_node;
struct cdx_controller *cdx_c;
struct cdx_mcdi *cdx_mcdi;
struct device *dev;
struct rproc *rp;
int ret;
dev = &pdev->dev;
cdx_c = platform_get_drvdata(pdev);
cdx_mcdi = cdx_c->priv;
r5_core_node = of_parse_phandle(dev->of_node, "xlnx,rproc", 0);
if (!r5_core_node) {
dev_err(&pdev->dev, "xlnx,rproc: invalid phandle\n");
return -EINVAL;
}
rp = rproc_get_by_phandle(r5_core_node->phandle);
if (!rp) {
ret = -EPROBE_DEFER;
goto pdev_err;
}
/* Attach to remote processor */
ret = rproc_boot(rp);
if (ret) {
dev_err(&pdev->dev, "Failed to attach to remote processor\n");
rproc_put(rp);
goto pdev_err;
}
cdx_mcdi->r5_rproc = rp;
pdev_err:
of_node_put(r5_core_node);
return ret;
}
static void cdx_detach_to_r5(struct platform_device *pdev)
{
struct cdx_controller *cdx_c;
struct cdx_mcdi *cdx_mcdi;
cdx_c = platform_get_drvdata(pdev);
cdx_mcdi = cdx_c->priv;
rproc_detach(cdx_mcdi->r5_rproc);
rproc_put(cdx_mcdi->r5_rproc);
}
static int cdx_rpmsg_cb(struct rpmsg_device *rpdev, void *data,
int len, void *priv, u32 src)
{
struct cdx_controller *cdx_c = dev_get_drvdata(&rpdev->dev);
struct cdx_mcdi *cdx_mcdi = cdx_c->priv;
if (len > MCDI_BUF_LEN)
return -EINVAL;
cdx_mcdi_process_cmd(cdx_mcdi, (struct cdx_dword *)data, len);
return 0;
}
static void cdx_rpmsg_post_probe_work(struct work_struct *work)
{
struct cdx_controller *cdx_c;
struct cdx_mcdi *cdx_mcdi;
cdx_mcdi = container_of(work, struct cdx_mcdi, work);
cdx_c = dev_get_drvdata(&cdx_mcdi->rpdev->dev);
cdx_rpmsg_post_probe(cdx_c);
}
static int cdx_rpmsg_probe(struct rpmsg_device *rpdev)
{
struct rpmsg_channel_info chinfo = {0};
struct cdx_controller *cdx_c;
struct cdx_mcdi *cdx_mcdi;
cdx_c = (struct cdx_controller *)cdx_rpmsg_id_table[0].driver_data;
cdx_mcdi = cdx_c->priv;
chinfo.src = RPMSG_ADDR_ANY;
chinfo.dst = rpdev->dst;
strscpy(chinfo.name, cdx_rpmsg_id_table[0].name,
strlen(cdx_rpmsg_id_table[0].name));
cdx_mcdi->ept = rpmsg_create_ept(rpdev, cdx_rpmsg_cb, NULL, chinfo);
if (!cdx_mcdi->ept) {
dev_err_probe(&rpdev->dev, -ENXIO,
"Failed to create ept for channel %s\n",
chinfo.name);
return -EINVAL;
}
cdx_mcdi->rpdev = rpdev;
dev_set_drvdata(&rpdev->dev, cdx_c);
schedule_work(&cdx_mcdi->work);
return 0;
}
static void cdx_rpmsg_remove(struct rpmsg_device *rpdev)
{
struct cdx_controller *cdx_c = dev_get_drvdata(&rpdev->dev);
struct cdx_mcdi *cdx_mcdi = cdx_c->priv;
flush_work(&cdx_mcdi->work);
cdx_rpmsg_pre_remove(cdx_c);
rpmsg_destroy_ept(cdx_mcdi->ept);
dev_set_drvdata(&rpdev->dev, NULL);
}
static struct rpmsg_driver cdx_rpmsg_driver = {
.drv.name = KBUILD_MODNAME,
.id_table = cdx_rpmsg_id_table,
.probe = cdx_rpmsg_probe,
.remove = cdx_rpmsg_remove,
.callback = cdx_rpmsg_cb,
};
int cdx_setup_rpmsg(struct platform_device *pdev)
{
struct cdx_controller *cdx_c;
struct cdx_mcdi *cdx_mcdi;
int ret;
/* Attach to remote processor */
ret = cdx_attach_to_rproc(pdev);
if (ret)
return ret;
cdx_c = platform_get_drvdata(pdev);
cdx_mcdi = cdx_c->priv;
/* Register RPMsg driver */
cdx_rpmsg_id_table[0].driver_data = (kernel_ulong_t)cdx_c;
INIT_WORK(&cdx_mcdi->work, cdx_rpmsg_post_probe_work);
ret = register_rpmsg_driver(&cdx_rpmsg_driver);
if (ret) {
dev_err(&pdev->dev,
"Failed to register cdx RPMsg driver: %d\n", ret);
cdx_detach_to_r5(pdev);
}
return ret;
}
void cdx_destroy_rpmsg(struct platform_device *pdev)
{
unregister_rpmsg_driver(&cdx_rpmsg_driver);
cdx_detach_to_r5(pdev);
}
|
