summaryrefslogtreecommitdiffstats
path: root/common/memtest.c
blob: 9eda78895dca0c32e305fbe3eb4684997e40025f (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
/*
 * memtest.c
 *
 * Copyright (C) 2013 Alexander Aring <aar@pengutronix.de>, Pengutronix
 *
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <progress.h>
#include <common.h>
#include <memory.h>
#include <types.h>
#include <linux/sizes.h>
#include <errno.h>
#include <memtest.h>

static const resource_size_t bitpattern[] = {
	0x00000001,	/* single bit */
	0x00000003,	/* two adjacent bits */
	0x00000007,	/* three adjacent bits */
	0x0000000F,	/* four adjacent bits */
	0x00000005,	/* two non-adjacent bits */
	0x00000015,	/* three non-adjacent bits */
	0x00000055,	/* four non-adjacent bits */
	0xAAAAAAAA,	/* alternating 1/0 */
};

/*
 * Perform a memory test. The complete test
 * loops until interrupted by ctrl-c.
 *
 * Prameters:
 * start: start address for memory test.
 * end: end address of memory test.
 * bus_only: skip integrity check and do only a address/data bus
 *	     testing.
 *
 * Return value can be -EINVAL for invalid parameter or -EINTR
 * if memory test was interrupted.
 */
int mem_test(resource_size_t _start,
	       resource_size_t _end, int bus_only)
{
	volatile resource_size_t *start, *dummy, val, readback, offset,
		offset2, pattern, temp, anti_pattern, num_words;
	int i;

	_start = ALIGN(_start, sizeof(resource_size_t));
	_end = ALIGN_DOWN(_end, sizeof(resource_size_t)) - 1;

	if (_end <= _start)
		return -EINVAL;

	start = (resource_size_t *)_start;
	/*
	 * Point the dummy to start[1]
	 */
	dummy = start + 1;
	num_words = (_end - _start + 1)/sizeof(resource_size_t);

	printf("Starting data line test.\n");

	/*
	 * Data line test: write a pattern to the first
	 * location, write the 1's complement to a 'parking'
	 * address (changes the state of the data bus so a
	 * floating bus doen't give a false OK), and then
	 * read the value back. Note that we read it back
	 * into a variable because the next time we read it,
	 * it might be right (been there, tough to explain to
	 * the quality guys why it prints a failure when the
	 * "is" and "should be" are obviously the same in the
	 * error message).
	 *
	 * Rather than exhaustively testing, we test some
	 * patterns by shifting '1' bits through a field of
	 * '0's and '0' bits through a field of '1's (i.e.
	 * pattern and ~pattern).
	 */
	for (i = 0; i < ARRAY_SIZE(bitpattern); i++) {
		val = bitpattern[i];

		for (; val != 0; val <<= 1) {
			*start = val;
			/* clear the test data off of the bus */
			*dummy = ~val;
			readback = *start;
			if (readback != val) {
				printf("FAILURE (data line): "
					"expected 0x%08x, actual 0x%08x at address 0x%08x.\n",
					val, readback, (resource_size_t)start);
				return -EIO;
			}

			*start = ~val;
			*dummy = val;
			readback = *start;
			if (readback != ~val) {
				printf("FAILURE (data line): "
					"Is 0x%08x, should be 0x%08x at address 0x%08x.\n",
					readback,
					~val, (resource_size_t)start);
				return -EIO;
			}
		}
	}


	/*
	 * Based on code whose Original Author and Copyright
	 * information follows: Copyright (c) 1998 by Michael
	 * Barr. This software is placed into the public
	 * domain and may be used for any purpose. However,
	 * this notice must not be changed or removed and no
	 * warranty is either expressed or implied by its
	 * publication or distribution.
	 */

	/*
	 * Address line test
	 *
	 * Description: Test the address bus wiring in a
	 *              memory region by performing a walking
	 *              1's test on the relevant bits of the
	 *              address and checking for aliasing.
	 *              This test will find single-bit
	 *              address failures such as stuck -high,
	 *              stuck-low, and shorted pins. The base
	 *              address and size of the region are
	 *              selected by the caller.
	 *
	 * Notes:	For best results, the selected base
	 *              address should have enough LSB 0's to
	 *              guarantee single address bit changes.
	 *              For example, to test a 64-Kbyte
	 *              region, select a base address on a
	 *              64-Kbyte boundary. Also, select the
	 *              region size as a power-of-two if at
	 *              all possible.
	 *
	 * ## NOTE ##	Be sure to specify start and end
	 *              addresses such that num_words has
	 *              lots of bits set. For example an
	 *              address range of 01000000 02000000 is
	 *              bad while a range of 01000000
	 *              01ffffff is perfect.
	 */

	pattern = 0xAAAAAAAA;
	anti_pattern = 0x55555555;

	/*
	 * Write the default pattern at each of the
	 * power-of-two offsets.
	 */
	for (offset = 1; offset <= num_words; offset <<= 1)
		start[offset] = pattern;

	/*
	 * Now write anti-pattern at offset 0. If during the previous
	 * step one of the address lines got stuck high this
	 * operation would result in a memory cell at power-of-two
	 * offset being set to anti-pattern which hopefully would be
	 * detected byt the loop that follows.
	 */
	start[0] = anti_pattern;

	printf("Check for address bits stuck high.\n");

	/*
	 * Check for address bits stuck high.
	 */
	for (offset = 1; offset <= num_words; offset <<= 1) {
		temp = start[offset];
		if (temp != pattern) {
			printf("FAILURE: Address bit "
					"stuck high @ 0x%08x:"
					" expected 0x%08x, actual 0x%08x.\n",
					(resource_size_t)&start[offset],
					pattern, temp);
			return -EIO;
		}
	}

	/*
	  Restore original value
	 */
	start[0] = pattern;

	printf("Check for address bits stuck "
			"low or shorted.\n");

	/*
	 * Check for address bits stuck low or shorted.
	 */
	for (offset2 = 1; offset2 <= num_words; offset2 <<= 1) {
		start[offset2] = anti_pattern;

		for (offset = 0; offset <= num_words;
		     offset = (offset) ? offset << 1 : 1) {
			temp = start[offset];

			if ((temp != pattern) &&
					(offset != offset2)) {
				printf("FAILURE: Address bit stuck"
						" low or shorted @"
						" 0x%08x: expected 0x%08x, actual 0x%08x.\n",
						(resource_size_t)&start[offset],
						pattern, temp);
				return -EIO;
			}
		}
		start[offset2] = pattern;
	}

	/*
	 * We tested only the bus if != 0
	 * leaving here
	 */
	if (bus_only)
		return 0;

	printf("Starting integrity check of physicaly ram.\n"
			"Filling ram with patterns...\n");

	/*
	 * Description: Test the integrity of a physical
	 *		memory device by performing an
	 *		increment/decrement test over the
	 *		entire region. In the process every
	 *		storage bit in the device is tested
	 *		as a zero and a one. The base address
	 *		and the size of the region are
	 *		selected by the caller.
	 */

	/*
	 * Fill memory with a known pattern.
	 */
	init_progression_bar(num_words);
	for (offset = 0; offset < num_words; offset++) {
		/*
		 * Every 4K we update the progressbar.
		 */
		if (!(offset & (SZ_4K - 1))) {
			if (ctrlc())
				return -EINTR;
			show_progress(offset);
		}

		start[offset] = offset + 1;
	}
	show_progress(offset);

	printf("\nCompare written patterns...\n");
	/*
	 * Check each location and invert it for the second pass.
	 */
	init_progression_bar(num_words - 1);
	for (offset = 0; offset < num_words; offset++) {
		if (!(offset & (SZ_4K - 1))) {
			if (ctrlc())
				return -EINTR;
			show_progress(offset);
		}

		temp = start[offset];
		if (temp != (offset + 1)) {
			printf("\nFAILURE (read/write) @ 0x%08x:"
					" expected 0x%08x, actual 0x%08x.\n",
					(resource_size_t)&start[offset],
					(offset + 1), temp);
			return -EIO;
		}

		anti_pattern = ~(offset + 1);
		start[offset] = anti_pattern;
	}
	show_progress(offset);

	printf("\nFilling ram with inverted pattern and compare it...\n");
	/*
	 * Check each location for the inverted pattern and zero it.
	 */
	init_progression_bar(num_words - 1);
	for (offset = 0; offset < num_words; offset++) {
		if (!(offset & (SZ_4K - 1))) {
			if (ctrlc())
				return -EINTR;
			show_progress(offset);
		}

		anti_pattern = ~(offset + 1);
		temp = start[offset];

		if (temp != anti_pattern) {
			printf("\nFAILURE (read/write): @ 0x%08x:"
					" expected 0x%08x, actual 0x%08x.\n",
					(resource_size_t)&start[offset],
					anti_pattern, temp);
			return -EIO;
		}

		start[offset] = 0;
	}
	show_progress(offset);

	/*
	 * end of progressbar
	 */
	printf("\n");

	return 0;
}