summaryrefslogtreecommitdiff
path: root/drivers/core/root.c
blob: 757d109e57a37399cafb5091273cf726759ce07d (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
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
/*
 * Copyright (c) 2013 Google, Inc
 *
 * (C) Copyright 2012
 * Pavel Herrmann <morpheus.ibis@gmail.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <libfdt.h>
#include <dm/device.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/of.h>
#include <dm/of_access.h>
#include <dm/platdata.h>
#include <dm/read.h>
#include <dm/root.h>
#include <dm/uclass.h>
#include <dm/util.h>
#include <linux/list.h>

DECLARE_GLOBAL_DATA_PTR;

struct root_priv {
	fdt_addr_t translation_offset;	/* optional translation offset */
};

static const struct driver_info root_info = {
	.name		= "root_driver",
};

struct udevice *dm_root(void)
{
	if (!gd->dm_root) {
		dm_warn("Virtual root driver does not exist!\n");
		return NULL;
	}

	return gd->dm_root;
}

void dm_fixup_for_gd_move(struct global_data *new_gd)
{
	/* The sentinel node has moved, so update things that point to it */
	if (gd->dm_root) {
		new_gd->uclass_root.next->prev = &new_gd->uclass_root;
		new_gd->uclass_root.prev->next = &new_gd->uclass_root;
	}
}

fdt_addr_t dm_get_translation_offset(void)
{
	struct udevice *root = dm_root();
	struct root_priv *priv = dev_get_priv(root);

	return priv->translation_offset;
}

void dm_set_translation_offset(fdt_addr_t offs)
{
	struct udevice *root = dm_root();
	struct root_priv *priv = dev_get_priv(root);

	priv->translation_offset = offs;
}

#if defined(CONFIG_NEEDS_MANUAL_RELOC)
void fix_drivers(void)
{
	struct driver *drv =
		ll_entry_start(struct driver, driver);
	const int n_ents = ll_entry_count(struct driver, driver);
	struct driver *entry;

	for (entry = drv; entry != drv + n_ents; entry++) {
		if (entry->of_match)
			entry->of_match = (const struct udevice_id *)
				((u32)entry->of_match + gd->reloc_off);
		if (entry->bind)
			entry->bind += gd->reloc_off;
		if (entry->probe)
			entry->probe += gd->reloc_off;
		if (entry->remove)
			entry->remove += gd->reloc_off;
		if (entry->unbind)
			entry->unbind += gd->reloc_off;
		if (entry->ofdata_to_platdata)
			entry->ofdata_to_platdata += gd->reloc_off;
		if (entry->child_post_bind)
			entry->child_post_bind += gd->reloc_off;
		if (entry->child_pre_probe)
			entry->child_pre_probe += gd->reloc_off;
		if (entry->child_post_remove)
			entry->child_post_remove += gd->reloc_off;
		/* OPS are fixed in every uclass post_probe function */
		if (entry->ops)
			entry->ops += gd->reloc_off;
	}
}

void fix_uclass(void)
{
	struct uclass_driver *uclass =
		ll_entry_start(struct uclass_driver, uclass);
	const int n_ents = ll_entry_count(struct uclass_driver, uclass);
	struct uclass_driver *entry;

	for (entry = uclass; entry != uclass + n_ents; entry++) {
		if (entry->post_bind)
			entry->post_bind += gd->reloc_off;
		if (entry->pre_unbind)
			entry->pre_unbind += gd->reloc_off;
		if (entry->pre_probe)
			entry->pre_probe += gd->reloc_off;
		if (entry->post_probe)
			entry->post_probe += gd->reloc_off;
		if (entry->pre_remove)
			entry->pre_remove += gd->reloc_off;
		if (entry->child_post_bind)
			entry->child_post_bind += gd->reloc_off;
		if (entry->child_pre_probe)
			entry->child_pre_probe += gd->reloc_off;
		if (entry->init)
			entry->init += gd->reloc_off;
		if (entry->destroy)
			entry->destroy += gd->reloc_off;
		/* FIXME maybe also need to fix these ops */
		if (entry->ops)
			entry->ops += gd->reloc_off;
	}
}

void fix_devices(void)
{
	struct driver_info *dev =
		ll_entry_start(struct driver_info, driver_info);
	const int n_ents = ll_entry_count(struct driver_info, driver_info);
	struct driver_info *entry;

	for (entry = dev; entry != dev + n_ents; entry++) {
		if (entry->platdata)
			entry->platdata += gd->reloc_off;
	}
}

#endif

int dm_init(bool of_live)
{
	int ret;

	if (gd->dm_root) {
		dm_warn("Virtual root driver already exists!\n");
		return -EINVAL;
	}
	INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);

#if defined(CONFIG_NEEDS_MANUAL_RELOC)
	fix_drivers();
	fix_uclass();
	fix_devices();
#endif

	ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
	if (ret)
		return ret;
#if CONFIG_IS_ENABLED(OF_CONTROL)
# if CONFIG_IS_ENABLED(OF_LIVE)
	if (of_live)
		DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root);
	else
#endif
		DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
#endif
	ret = device_probe(DM_ROOT_NON_CONST);
	if (ret)
		return ret;

	return 0;
}

int dm_uninit(void)
{
	device_remove(dm_root(), DM_REMOVE_NORMAL);
	device_unbind(dm_root());

	return 0;
}

#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
int dm_remove_devices_flags(uint flags)
{
	device_remove(dm_root(), flags);

	return 0;
}
#endif

int dm_scan_platdata(bool pre_reloc_only)
{
	int ret;

	ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
	if (ret == -ENOENT) {
		dm_warn("Some drivers were not found\n");
		ret = 0;
	}

	return ret;
}

#if CONFIG_IS_ENABLED(OF_LIVE)
static int dm_scan_fdt_live(struct udevice *parent,
			    const struct device_node *node_parent,
			    bool pre_reloc_only)
{
	struct device_node *np;
	int ret = 0, err;

	for (np = node_parent->child; np; np = np->sibling) {
		if (pre_reloc_only &&
		    !of_find_property(np, "u-boot,dm-pre-reloc", NULL))
			continue;
		if (!of_device_is_available(np)) {
			dm_dbg("   - ignoring disabled device\n");
			continue;
		}
		err = lists_bind_fdt(parent, np_to_ofnode(np), NULL);
		if (err && !ret) {
			ret = err;
			debug("%s: ret=%d\n", np->name, ret);
		}
	}

	if (ret)
		dm_warn("Some drivers failed to bind\n");

	return ret;
}
#endif /* CONFIG_IS_ENABLED(OF_LIVE) */

#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
/**
 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
 *
 * This scans the subnodes of a device tree node and and creates a driver
 * for each one.
 *
 * @parent: Parent device for the devices that will be created
 * @blob: Pointer to device tree blob
 * @offset: Offset of node to scan
 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
 * flag. If false bind all drivers.
 * @return 0 if OK, -ve on error
 */
static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
			    int offset, bool pre_reloc_only)
{
	int ret = 0, err;

	for (offset = fdt_first_subnode(blob, offset);
	     offset > 0;
	     offset = fdt_next_subnode(blob, offset)) {
		if (pre_reloc_only &&
		    !dm_fdt_pre_reloc(blob, offset))
			continue;
		if (!fdtdec_get_is_enabled(blob, offset)) {
			dm_dbg("   - ignoring disabled device\n");
			continue;
		}
		err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL);
		if (err && !ret) {
			ret = err;
			debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
			      ret);
		}
	}

	if (ret)
		dm_warn("Some drivers failed to bind\n");

	return ret;
}

int dm_scan_fdt_dev(struct udevice *dev)
{
	if (!dev_of_valid(dev))
		return 0;

#if CONFIG_IS_ENABLED(OF_LIVE)
	if (of_live_active())
		return dm_scan_fdt_live(dev, dev_np(dev),
				gd->flags & GD_FLG_RELOC ? false : true);
	else
#endif
	return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev),
				gd->flags & GD_FLG_RELOC ? false : true);
}

int dm_scan_fdt(const void *blob, bool pre_reloc_only)
{
#if CONFIG_IS_ENABLED(OF_LIVE)
	if (of_live_active())
		return dm_scan_fdt_live(gd->dm_root, gd->of_root,
					pre_reloc_only);
	else
#endif
	return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
}
#else
static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
			    int offset, bool pre_reloc_only)
{
	return 0;
}
#endif

int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
{
	int node, ret;

	ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
	if (ret) {
		debug("dm_scan_fdt() failed: %d\n", ret);
		return ret;
	}

	/* bind fixed-clock */
	node = ofnode_to_offset(ofnode_path("/clocks"));
	/* if no DT "clocks" node, no need to go further */
	if (node < 0)
		return ret;

	ret = dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node,
			       pre_reloc_only);
	if (ret)
		debug("dm_scan_fdt_node() failed: %d\n", ret);

	return ret;
}

__weak int dm_scan_other(bool pre_reloc_only)
{
	return 0;
}

int dm_init_and_scan(bool pre_reloc_only)
{
	int ret;

	ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE));
	if (ret) {
		debug("dm_init() failed: %d\n", ret);
		return ret;
	}
	ret = dm_scan_platdata(pre_reloc_only);
	if (ret) {
		debug("dm_scan_platdata() failed: %d\n", ret);
		return ret;
	}

	if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
		ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only);
		if (ret) {
			debug("dm_extended_scan_dt() failed: %d\n", ret);
			return ret;
		}
	}

	ret = dm_scan_other(pre_reloc_only);
	if (ret)
		return ret;

	return 0;
}

/* This is the root driver - all drivers are children of this */
U_BOOT_DRIVER(root_driver) = {
	.name	= "root_driver",
	.id	= UCLASS_ROOT,
	.priv_auto_alloc_size = sizeof(struct root_priv),
};

/* This is the root uclass */
UCLASS_DRIVER(root) = {
	.name	= "root",
	.id	= UCLASS_ROOT,
};