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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Direct Memory Access U-Class Simulation driver
*
* Copyright (C) 2018 Texas Instruments Incorporated <www.ti.com>
*
* Author: Grygorii Strashko <grygorii.strashko@ti.com>
*/
#include <common.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <dm/read.h>
#include <dma-uclass.h>
#include <dt-structs.h>
#include <errno.h>
#define SANDBOX_DMA_CH_CNT 3
#define SANDBOX_DMA_BUF_SIZE 1024
struct sandbox_dma_chan {
struct sandbox_dma_dev *ud;
char name[20];
u32 id;
enum dma_direction dir;
bool in_use;
bool enabled;
};
struct sandbox_dma_dev {
struct device *dev;
u32 ch_count;
struct sandbox_dma_chan channels[SANDBOX_DMA_CH_CNT];
uchar buf[SANDBOX_DMA_BUF_SIZE];
uchar *buf_rx;
size_t data_len;
u32 meta;
};
static int sandbox_dma_transfer(struct udevice *dev, int direction,
dma_addr_t dst, dma_addr_t src, size_t len)
{
memcpy((void *)dst, (void *)src, len);
return 0;
}
static int sandbox_dma_of_xlate(struct dma *dma,
struct ofnode_phandle_args *args)
{
struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
struct sandbox_dma_chan *uc;
debug("%s(dma id=%u)\n", __func__, args->args[0]);
if (args->args[0] >= SANDBOX_DMA_CH_CNT)
return -EINVAL;
dma->id = args->args[0];
uc = &ud->channels[dma->id];
if (dma->id == 1)
uc->dir = DMA_MEM_TO_DEV;
else if (dma->id == 2)
uc->dir = DMA_DEV_TO_MEM;
else
uc->dir = DMA_MEM_TO_MEM;
debug("%s(dma id=%lu dir=%d)\n", __func__, dma->id, uc->dir);
return 0;
}
static int sandbox_dma_request(struct dma *dma)
{
struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
struct sandbox_dma_chan *uc;
if (dma->id >= SANDBOX_DMA_CH_CNT)
return -EINVAL;
uc = &ud->channels[dma->id];
if (uc->in_use)
return -EBUSY;
uc->in_use = true;
debug("%s(dma id=%lu in_use=%d)\n", __func__, dma->id, uc->in_use);
return 0;
}
static int sandbox_dma_rfree(struct dma *dma)
{
struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
struct sandbox_dma_chan *uc;
if (dma->id >= SANDBOX_DMA_CH_CNT)
return -EINVAL;
uc = &ud->channels[dma->id];
if (!uc->in_use)
return -EINVAL;
uc->in_use = false;
ud->buf_rx = NULL;
ud->data_len = 0;
debug("%s(dma id=%lu in_use=%d)\n", __func__, dma->id, uc->in_use);
return 0;
}
static int sandbox_dma_enable(struct dma *dma)
{
struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
struct sandbox_dma_chan *uc;
if (dma->id >= SANDBOX_DMA_CH_CNT)
return -EINVAL;
uc = &ud->channels[dma->id];
if (!uc->in_use)
return -EINVAL;
if (uc->enabled)
return -EINVAL;
uc->enabled = true;
debug("%s(dma id=%lu enabled=%d)\n", __func__, dma->id, uc->enabled);
return 0;
}
static int sandbox_dma_disable(struct dma *dma)
{
struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
struct sandbox_dma_chan *uc;
if (dma->id >= SANDBOX_DMA_CH_CNT)
return -EINVAL;
uc = &ud->channels[dma->id];
if (!uc->in_use)
return -EINVAL;
if (!uc->enabled)
return -EINVAL;
uc->enabled = false;
debug("%s(dma id=%lu enabled=%d)\n", __func__, dma->id, uc->enabled);
return 0;
}
static int sandbox_dma_send(struct dma *dma,
void *src, size_t len, void *metadata)
{
struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
struct sandbox_dma_chan *uc;
if (dma->id >= SANDBOX_DMA_CH_CNT)
return -EINVAL;
if (!src || !metadata)
return -EINVAL;
debug("%s(dma id=%lu)\n", __func__, dma->id);
uc = &ud->channels[dma->id];
if (uc->dir != DMA_MEM_TO_DEV)
return -EINVAL;
if (!uc->in_use)
return -EINVAL;
if (!uc->enabled)
return -EINVAL;
if (len >= SANDBOX_DMA_BUF_SIZE)
return -EINVAL;
memcpy(ud->buf, src, len);
ud->data_len = len;
ud->meta = *((u32 *)metadata);
debug("%s(dma id=%lu len=%zu meta=%08x)\n",
__func__, dma->id, len, ud->meta);
return 0;
}
static int sandbox_dma_receive(struct dma *dma, void **dst, void *metadata)
{
struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
struct sandbox_dma_chan *uc;
if (dma->id >= SANDBOX_DMA_CH_CNT)
return -EINVAL;
if (!dst || !metadata)
return -EINVAL;
uc = &ud->channels[dma->id];
if (uc->dir != DMA_DEV_TO_MEM)
return -EINVAL;
if (!uc->in_use)
return -EINVAL;
if (!uc->enabled)
return -EINVAL;
if (!ud->data_len)
return 0;
if (ud->buf_rx) {
memcpy(ud->buf_rx, ud->buf, ud->data_len);
*dst = ud->buf_rx;
} else {
memcpy(*dst, ud->buf, ud->data_len);
}
*((u32 *)metadata) = ud->meta;
debug("%s(dma id=%lu len=%zu meta=%08x %p)\n",
__func__, dma->id, ud->data_len, ud->meta, *dst);
return ud->data_len;
}
static int sandbox_dma_prepare_rcv_buf(struct dma *dma, void *dst, size_t size)
{
struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
ud->buf_rx = dst;
return 0;
}
static const struct dma_ops sandbox_dma_ops = {
.transfer = sandbox_dma_transfer,
.of_xlate = sandbox_dma_of_xlate,
.request = sandbox_dma_request,
.rfree = sandbox_dma_rfree,
.enable = sandbox_dma_enable,
.disable = sandbox_dma_disable,
.send = sandbox_dma_send,
.receive = sandbox_dma_receive,
.prepare_rcv_buf = sandbox_dma_prepare_rcv_buf,
};
static int sandbox_dma_probe(struct udevice *dev)
{
struct dma_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct sandbox_dma_dev *ud = dev_get_priv(dev);
int i, ret = 0;
uc_priv->supported = DMA_SUPPORTS_MEM_TO_MEM |
DMA_SUPPORTS_MEM_TO_DEV |
DMA_SUPPORTS_DEV_TO_MEM;
ud->ch_count = SANDBOX_DMA_CH_CNT;
ud->buf_rx = NULL;
ud->meta = 0;
ud->data_len = 0;
pr_err("Number of channels: %u\n", ud->ch_count);
for (i = 0; i < ud->ch_count; i++) {
struct sandbox_dma_chan *uc = &ud->channels[i];
uc->ud = ud;
uc->id = i;
sprintf(uc->name, "DMA chan%d\n", i);
uc->in_use = false;
uc->enabled = false;
}
return ret;
}
static const struct udevice_id sandbox_dma_ids[] = {
{ .compatible = "sandbox,dma" },
{ }
};
U_BOOT_DRIVER(sandbox_dma) = {
.name = "sandbox-dma",
.id = UCLASS_DMA,
.of_match = sandbox_dma_ids,
.ops = &sandbox_dma_ops,
.probe = sandbox_dma_probe,
.priv_auto = sizeof(struct sandbox_dma_dev),
};
|