summaryrefslogtreecommitdiff
path: root/drivers/remoteproc/sandbox_testproc.c
blob: 004c7792d186b1c2495930f49bb1393af3f1ad5c (plain)
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
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
/*
 * (C) Copyright 2015
 * Texas Instruments Incorporated - http://www.ti.com/
 * SPDX-License-Identifier:	GPL-2.0+
 */
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <remoteproc.h>

/**
 * enum sandbox_state - different device states
 * @sb_booted:	Entry condition, just booted
 * @sb_init:	Initialized (basic environment is ready)
 * @sb_reset:	Held in reset (accessible, but not running)
 * @sb_loaded:	Loaded with image (but not running)
 * @sb_running:	Processor is running
 */
enum sandbox_state {
	sb_booted,
	sb_init,
	sb_reset,
	sb_loaded,
	sb_running
};

/**
 * struct sandbox_test_devdata - private data per device
 * @current_state:	device current state
 */
struct sandbox_test_devdata {
	enum sandbox_state current_state;
};

/**
 * sandbox_dev_move_to_state() - statemachine for our dummy device
 * @dev:	device to switch state
 * @next_state:	next proposed state
 *
 * This tries to follow the following statemachine:
 *           Entry
 *            |
 *            v
 *         +-------+
 *     +---+ init  |
 *     |   |       | <---------------------+
 *     |   +-------+                       |
 *     |                                   |
 *     |                                   |
 *     |   +--------+                      |
 * Load|   |  reset |                      |
 *     |   |        | <----------+         |
 *     |   +--------+            |         |
 *     |        |Load            |         |
 *     |        |                |         |
 *     |   +----v----+   reset   |         |
 *     +-> |         |    (opt)  |         |
 *         |  Loaded +-----------+         |
 *         |         |                     |
 *         +----+----+                     |
 *              | Start                    |
 *          +---v-----+        (opt)       |
 *       +->| Running |        Stop        |
 * Ping  +- |         +--------------------+
 * (opt)    +---------+
 *
 * (is_running does not change state)
 *
 * Return: 0 when valid state transition is seen, else returns -EINVAL
 */
static int sandbox_dev_move_to_state(struct udevice *dev,
				     enum sandbox_state next_state)
{
	struct sandbox_test_devdata *ddata = dev_get_priv(dev);

	/* No state transition is OK */
	if (ddata->current_state == next_state)
		return 0;

	debug("current_state=%d, next_state=%d\n", ddata->current_state,
	      next_state);
	switch (ddata->current_state) {
	case sb_booted:
		if (next_state == sb_init)
			goto ok_state;
		break;

	case sb_init:
		if (next_state == sb_reset || next_state == sb_loaded)
			goto ok_state;
		break;

	case sb_reset:
		if (next_state == sb_loaded || next_state == sb_init)
			goto ok_state;
		break;

	case sb_loaded:
		if (next_state == sb_reset || next_state == sb_init ||
		    next_state == sb_running)
			goto ok_state;
		break;

	case sb_running:
		if (next_state == sb_reset || next_state == sb_init)
			goto ok_state;
		break;
	};
	return -EINVAL;

ok_state:
	ddata->current_state = next_state;
	return 0;
}

/**
 * sandbox_testproc_probe() - basic probe function
 * @dev:	test proc device that is being probed.
 *
 * Return: 0 if all went ok, else return appropriate error
 */
static int sandbox_testproc_probe(struct udevice *dev)
{
	struct dm_rproc_uclass_pdata *uc_pdata;
	struct sandbox_test_devdata *ddata;
	int ret;

	uc_pdata = dev_get_uclass_platdata(dev);
	ddata = dev_get_priv(dev);
	if (!ddata) {
		debug("%s: platform private data missing\n", uc_pdata->name);
		return -EINVAL;
	}
	ret = sandbox_dev_move_to_state(dev, sb_booted);
	debug("%s: called(%d)\n", uc_pdata->name, ret);

	return ret;
}

/**
 * sandbox_testproc_init() - Simple initialization function
 * @dev:	device to operate upon
 *
 * Return: 0 if all went ok, else return appropriate error
 */
static int sandbox_testproc_init(struct udevice *dev)
{
	struct dm_rproc_uclass_pdata *uc_pdata;
	int ret;

	uc_pdata = dev_get_uclass_platdata(dev);

	ret = sandbox_dev_move_to_state(dev, sb_init);

	debug("%s: called(%d)\n", uc_pdata->name, ret);
	if (ret)
		debug("%s init failed\n", uc_pdata->name);

	return ret;
}

/**
 * sandbox_testproc_reset() - Reset the remote processor
 * @dev:	device to operate upon
 *
 * Return: 0 if all went ok, else return appropriate error
 */
static int sandbox_testproc_reset(struct udevice *dev)
{
	struct dm_rproc_uclass_pdata *uc_pdata;
	int ret;

	uc_pdata = dev_get_uclass_platdata(dev);

	ret = sandbox_dev_move_to_state(dev, sb_reset);

	debug("%s: called(%d)\n", uc_pdata->name, ret);

	if (ret)
		debug("%s reset failed\n", uc_pdata->name);
	return ret;
}

/**
 * sandbox_testproc_load() - (replace: short desc)
 * @dev:	device to operate upon
 * @addr:	Address of the binary image to load
 * @size:	Size (in bytes) of the binary image to load
 *
 * Return: 0 if all went ok, else return appropriate error
 */
static int sandbox_testproc_load(struct udevice *dev, ulong addr, ulong size)
{
	struct dm_rproc_uclass_pdata *uc_pdata;
	int ret;

	uc_pdata = dev_get_uclass_platdata(dev);

	ret = sandbox_dev_move_to_state(dev, sb_loaded);

	debug("%s: called(%d) Loading to %08lX %lu size\n",
	      uc_pdata->name, ret, addr, size);

	if (ret)
		debug("%s load failed\n", uc_pdata->name);
	return ret;
}

/**
 * sandbox_testproc_start() - Start the remote processor
 * @dev:	device to operate upon
 *
 * Return: 0 if all went ok, else return appropriate error
 */
static int sandbox_testproc_start(struct udevice *dev)
{
	struct dm_rproc_uclass_pdata *uc_pdata;
	int ret;

	uc_pdata = dev_get_uclass_platdata(dev);

	ret = sandbox_dev_move_to_state(dev, sb_running);

	debug("%s: called(%d)\n", uc_pdata->name, ret);

	if (ret)
		debug("%s start failed\n", uc_pdata->name);
	return ret;
}

/**
 * sandbox_testproc_stop() - Stop the remote processor
 * @dev:	device to operate upon
 *
 * Return: 0 if all went ok, else return appropriate error
 */
static int sandbox_testproc_stop(struct udevice *dev)
{
	struct dm_rproc_uclass_pdata *uc_pdata;
	int ret;

	uc_pdata = dev_get_uclass_platdata(dev);

	ret = sandbox_dev_move_to_state(dev, sb_init);

	debug("%s: called(%d)\n", uc_pdata->name, ret);

	if (ret)
		debug("%s stop failed\n", uc_pdata->name);
	return ret;
}

/**
 * sandbox_testproc_is_running() - Check if remote processor is running
 * @dev:	device to operate upon
 *
 * Return: 0 if running, 1 if not running
 */
static int sandbox_testproc_is_running(struct udevice *dev)
{
	struct dm_rproc_uclass_pdata *uc_pdata;
	struct sandbox_test_devdata *ddata;
	int ret = 1;

	uc_pdata = dev_get_uclass_platdata(dev);
	ddata = dev_get_priv(dev);

	if (ddata->current_state == sb_running)
		ret = 0;
	debug("%s: called(%d)\n", uc_pdata->name, ret);

	return ret;
}

/**
 * sandbox_testproc_ping() - Try pinging remote processor
 * @dev:	device to operate upon
 *
 * Return: 0 if running, -EINVAL if not running
 */
static int sandbox_testproc_ping(struct udevice *dev)
{
	struct dm_rproc_uclass_pdata *uc_pdata;
	struct sandbox_test_devdata *ddata;
	int ret;

	uc_pdata = dev_get_uclass_platdata(dev);
	ddata = dev_get_priv(dev);

	if (ddata->current_state == sb_running)
		ret = 0;
	else
		ret = -EINVAL;

	debug("%s: called(%d)\n", uc_pdata->name, ret);
	if (ret)
		debug("%s: No response.(Not started?)\n", uc_pdata->name);

	return ret;
}

static const struct dm_rproc_ops sandbox_testproc_ops = {
	.init = sandbox_testproc_init,
	.reset = sandbox_testproc_reset,
	.load = sandbox_testproc_load,
	.start = sandbox_testproc_start,
	.stop = sandbox_testproc_stop,
	.is_running = sandbox_testproc_is_running,
	.ping = sandbox_testproc_ping,
};

static const struct udevice_id sandbox_ids[] = {
	{.compatible = "sandbox,test-processor"},
	{}
};

U_BOOT_DRIVER(sandbox_testproc) = {
	.name = "sandbox_test_proc",
	.of_match = sandbox_ids,
	.id = UCLASS_REMOTEPROC,
	.ops = &sandbox_testproc_ops,
	.probe = sandbox_testproc_probe,
	.priv_auto_alloc_size = sizeof(struct sandbox_test_devdata),
};

/* TODO(nm@ti.com): Remove this along with non-DT support */
static struct dm_rproc_uclass_pdata proc_3_test = {
	.name = "proc_3_legacy",
	.mem_type = RPROC_INTERNAL_MEMORY_MAPPED,
};

U_BOOT_DEVICE(proc_3_demo) = {
	.name = "sandbox_test_proc",
	.platdata = &proc_3_test,
};