summaryrefslogtreecommitdiffstats
path: root/drivers/remoteproc/ste_modem_rproc.c
blob: dd193f35a1ff22d3c36406edc44b3e106ea8d6e3 (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
337
338
339
340
341
342
/*
 * Copyright (C) ST-Ericsson AB 2012
 * Author: Sjur Brændeland <sjur.brandeland@stericsson.com>
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/remoteproc.h>
#include <linux/ste_modem_shm.h>
#include "remoteproc_internal.h"

#define SPROC_FW_SIZE (50 * 4096)
#define SPROC_MAX_TOC_ENTRIES 32
#define SPROC_MAX_NOTIFY_ID 14
#define SPROC_RESOURCE_NAME "rsc-table"
#define SPROC_MODEM_NAME "ste-modem"
#define SPROC_MODEM_FIRMWARE SPROC_MODEM_NAME "-fw.bin"

#define sproc_dbg(sproc, fmt, ...) \
	dev_dbg(&sproc->mdev->pdev.dev, fmt, ##__VA_ARGS__)
#define sproc_err(sproc, fmt, ...) \
	dev_err(&sproc->mdev->pdev.dev, fmt, ##__VA_ARGS__)

/* STE-modem control structure */
struct sproc {
	struct rproc *rproc;
	struct ste_modem_device *mdev;
	int error;
	void *fw_addr;
	size_t fw_size;
	dma_addr_t fw_dma_addr;
};

/* STE-Modem firmware entry */
struct ste_toc_entry {
	__le32 start;
	__le32 size;
	__le32 flags;
	__le32 entry_point;
	__le32 load_addr;
	char name[12];
};

/*
 * The Table Of Content is located at the start of the firmware image and
 * at offset zero in the shared memory region. The resource table typically
 * contains the initial boot image (boot strap) and other information elements
 * such as remoteproc resource table. Each entry is identified by a unique
 * name.
 */
struct ste_toc {
	struct ste_toc_entry table[SPROC_MAX_TOC_ENTRIES];
};

/* Loads the firmware to shared memory. */
static int sproc_load_segments(struct rproc *rproc, const struct firmware *fw)
{
	struct sproc *sproc = rproc->priv;

	memcpy(sproc->fw_addr, fw->data, fw->size);

	return 0;
}

/* Find the entry for resource table in the Table of Content */
static const struct ste_toc_entry *sproc_find_rsc_entry(const void *data)
{
	int i;
	const struct ste_toc *toc;
	toc = data;

	/* Search the table for the resource table */
	for (i = 0; i < SPROC_MAX_TOC_ENTRIES &&
		    toc->table[i].start != 0xffffffff; i++) {
		if (!strncmp(toc->table[i].name, SPROC_RESOURCE_NAME,
			     sizeof(toc->table[i].name)))
			return &toc->table[i];
	}

	return NULL;
}

/* Find the resource table inside the remote processor's firmware. */
static struct resource_table *
sproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
		     int *tablesz)
{
	struct sproc *sproc = rproc->priv;
	struct resource_table *table;
	const struct ste_toc_entry *entry;

	if (!fw)
		return NULL;

	entry = sproc_find_rsc_entry(fw->data);
	if (!entry) {
		sproc_err(sproc, "resource table not found in fw\n");
		return NULL;
	}

	table = (void *)(fw->data + entry->start);

	/* sanity check size and offset of resource table */
	if (entry->start > SPROC_FW_SIZE ||
	    entry->size > SPROC_FW_SIZE ||
	    fw->size > SPROC_FW_SIZE ||
	    entry->start + entry->size > fw->size ||
	    sizeof(struct resource_table) > entry->size) {
		sproc_err(sproc, "bad size of fw or resource table\n");
		return NULL;
	}

	/* we don't support any version beyond the first */
	if (table->ver != 1) {
		sproc_err(sproc, "unsupported fw ver: %d\n", table->ver);
		return NULL;
	}

	/* make sure reserved bytes are zeroes */
	if (table->reserved[0] || table->reserved[1]) {
		sproc_err(sproc, "non zero reserved bytes\n");
		return NULL;
	}

	/* make sure the offsets array isn't truncated */
	if (table->num > SPROC_MAX_TOC_ENTRIES ||
	    table->num * sizeof(table->offset[0]) +
	    sizeof(struct resource_table) > entry->size) {
		sproc_err(sproc, "resource table incomplete\n");
		return NULL;
	}

	/* If the fw size has grown, release the previous fw allocation */
	if (SPROC_FW_SIZE < fw->size) {
		sproc_err(sproc, "Insufficient space for fw (%d < %zd)\n",
			  SPROC_FW_SIZE, fw->size);
		return NULL;
	}

	sproc->fw_size = fw->size;
	*tablesz = entry->size;

	return table;
}

/* Find the resource table inside the remote processor's firmware. */
static struct resource_table *
sproc_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw)
{
	struct sproc *sproc = rproc->priv;
	const struct ste_toc_entry *entry;

	if (!fw || !sproc->fw_addr)
		return NULL;

	entry = sproc_find_rsc_entry(sproc->fw_addr);
	if (!entry) {
		sproc_err(sproc, "resource table not found in fw\n");
		return NULL;
	}

	return sproc->fw_addr + entry->start;
}

/* STE modem firmware handler operations */
static const struct rproc_fw_ops sproc_fw_ops = {
	.load = sproc_load_segments,
	.find_rsc_table = sproc_find_rsc_table,
	.find_loaded_rsc_table = sproc_find_loaded_rsc_table,
};

/* Kick the modem with specified notification id */
static void sproc_kick(struct rproc *rproc, int vqid)
{
	struct sproc *sproc = rproc->priv;

	sproc_dbg(sproc, "kick vqid:%d\n", vqid);

	/*
	 * We need different notification IDs for RX and TX so add
	 * an offset on TX notification IDs.
	 */
	sproc->mdev->ops.kick(sproc->mdev, vqid + SPROC_MAX_NOTIFY_ID);
}

/* Received a kick from a modem, kick the virtqueue */
static void sproc_kick_callback(struct ste_modem_device *mdev, int vqid)
{
	struct sproc *sproc = mdev->drv_data;

	if (rproc_vq_interrupt(sproc->rproc, vqid) == IRQ_NONE)
		sproc_dbg(sproc, "no message was found in vqid %d\n", vqid);
}

static struct ste_modem_dev_cb sproc_dev_cb = {
	.kick = sproc_kick_callback,
};

/* Start the STE modem */
static int sproc_start(struct rproc *rproc)
{
	struct sproc *sproc = rproc->priv;
	int i, err;

	sproc_dbg(sproc, "start ste-modem\n");

	/* Sanity test the max_notifyid */
	if (rproc->max_notifyid > SPROC_MAX_NOTIFY_ID) {
		sproc_err(sproc, "Notification IDs too high:%d\n",
			  rproc->max_notifyid);
		return -EINVAL;
	}

	/* Subscribe to notifications */
	for (i = 0; i <= rproc->max_notifyid; i++) {
		err = sproc->mdev->ops.kick_subscribe(sproc->mdev, i);
		if (err) {
			sproc_err(sproc,
				  "subscription of kicks failed:%d\n", err);
			return err;
		}
	}

	/* Request modem start-up*/
	return sproc->mdev->ops.power(sproc->mdev, true);
}

/* Stop the STE modem */
static int sproc_stop(struct rproc *rproc)
{
	struct sproc *sproc = rproc->priv;
	sproc_dbg(sproc, "stop ste-modem\n");

	return sproc->mdev->ops.power(sproc->mdev, false);
}

static struct rproc_ops sproc_ops = {
	.start		= sproc_start,
	.stop		= sproc_stop,
	.kick		= sproc_kick,
};

/* STE modem device is unregistered */
static int sproc_drv_remove(struct platform_device *pdev)
{
	struct ste_modem_device *mdev =
		container_of(pdev, struct ste_modem_device, pdev);
	struct sproc *sproc = mdev->drv_data;

	sproc_dbg(sproc, "remove ste-modem\n");

	/* Reset device callback functions */
	sproc->mdev->ops.setup(sproc->mdev, NULL);

	/* Unregister as remoteproc device */
	rproc_del(sproc->rproc);
	dma_free_coherent(sproc->rproc->dev.parent, SPROC_FW_SIZE,
			  sproc->fw_addr, sproc->fw_dma_addr);
	rproc_put(sproc->rproc);

	mdev->drv_data = NULL;

	return 0;
}

/* Handle probe of a modem device */
static int sproc_probe(struct platform_device *pdev)
{
	struct ste_modem_device *mdev =
		container_of(pdev, struct ste_modem_device, pdev);
	struct sproc *sproc;
	struct rproc *rproc;
	int err;

	dev_dbg(&mdev->pdev.dev, "probe ste-modem\n");

	if (!mdev->ops.setup || !mdev->ops.kick || !mdev->ops.kick_subscribe ||
	    !mdev->ops.power) {
		dev_err(&mdev->pdev.dev, "invalid mdev ops\n");
		return -EINVAL;
	}

	rproc = rproc_alloc(&mdev->pdev.dev, mdev->pdev.name, &sproc_ops,
			    SPROC_MODEM_FIRMWARE, sizeof(*sproc));
	if (!rproc)
		return -ENOMEM;

	sproc = rproc->priv;
	sproc->mdev = mdev;
	sproc->rproc = rproc;
	rproc->has_iommu = false;
	mdev->drv_data = sproc;

	/* Provide callback functions to modem device */
	sproc->mdev->ops.setup(sproc->mdev, &sproc_dev_cb);

	/* Set the STE-modem specific firmware handler */
	rproc->fw_ops = &sproc_fw_ops;

	/*
	 * STE-modem requires the firmware to be located
	 * at the start of the shared memory region. So we need to
	 * reserve space for firmware at the start.
	 */
	sproc->fw_addr = dma_alloc_coherent(rproc->dev.parent, SPROC_FW_SIZE,
					    &sproc->fw_dma_addr,
					    GFP_KERNEL);
	if (!sproc->fw_addr) {
		sproc_err(sproc, "Cannot allocate memory for fw\n");
		err = -ENOMEM;
		goto free_rproc;
	}

	/* Register as a remoteproc device */
	err = rproc_add(rproc);
	if (err)
		goto free_mem;

	return 0;

free_mem:
	dma_free_coherent(rproc->dev.parent, SPROC_FW_SIZE,
			  sproc->fw_addr, sproc->fw_dma_addr);
free_rproc:
	/* Reset device data upon error */
	mdev->drv_data = NULL;
	rproc_put(rproc);
	return err;
}

static struct platform_driver sproc_driver = {
	.driver	= {
		.name	= SPROC_MODEM_NAME,
	},
	.probe	= sproc_probe,
	.remove	= sproc_drv_remove,
};

module_platform_driver(sproc_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("STE Modem driver using the Remote Processor Framework");
OpenPOWER on IntegriCloud