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barebox/common/memtest.c

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/*
* 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>
#include <malloc.h>
#include <mmu.h>
static int alloc_memtest_region(struct list_head *list,
resource_size_t start, resource_size_t size)
{
struct resource *r_new;
struct mem_test_resource *r;
r = xzalloc(sizeof(struct mem_test_resource));
r_new = request_sdram_region("memtest", start, size);
if (!r_new)
return -EINVAL;
r->r = r_new;
list_add_tail(&r->list, list);
return 0;
}
int mem_test_request_regions(struct list_head *list)
{
int ret;
struct memory_bank *bank;
struct resource *r, *r_prev = NULL;
resource_size_t start, end, size;
for_each_memory_bank(bank) {
/*
* If we don't have any allocated region on bank,
* we use the whole bank boundary
*/
if (list_empty(&bank->res->children)) {
start = PAGE_ALIGN(bank->res->start);
size = PAGE_ALIGN_DOWN(bank->res->end - start + 1);
if (size) {
ret = alloc_memtest_region(list, start, size);
if (ret < 0)
return ret;
}
continue;
}
r = list_first_entry(&bank->res->children,
struct resource, sibling);
start = PAGE_ALIGN(bank->res->start);
end = PAGE_ALIGN_DOWN(r->start);
r_prev = r;
if (start != end) {
size = end - start;
ret = alloc_memtest_region(list, start, size);
if (ret < 0)
return ret;
}
/*
* We assume that the regions are sorted in this list
* So the first element has start boundary on bank->res->start
* and the last element hast end boundary on bank->res->end.
*
* Between used regions. Start from second entry.
*/
list_for_each_entry_from(r, &bank->res->children, sibling) {
start = PAGE_ALIGN(r_prev->end + 1);
end = r->start - 1;
r_prev = r;
if (start >= end)
continue;
size = PAGE_ALIGN_DOWN(end - start + 1);
if (size == 0)
continue;
ret = alloc_memtest_region(list, start, size);
if (ret < 0)
return ret;
}
/*
* Do on head element for bank boundary.
*/
r = list_last_entry(&bank->res->children,
struct resource, sibling);
start = PAGE_ALIGN(r->end);
end = bank->res->end;
size = PAGE_ALIGN_DOWN(end - start + 1);
if (size && start < end && start > r->end) {
ret = alloc_memtest_region(list, start, size);
if (ret < 0)
return ret;
}
}
return 0;
}
void mem_test_release_regions(struct list_head *list)
{
struct mem_test_resource *r, *r_tmp;
list_for_each_entry_safe(r, r_tmp, list, list) {
/*
* Ensure to leave with a cached on non used sdram regions.
*/
remap_range((void *)r->r->start, r->r->end -
r->r->start + 1, MAP_DEFAULT);
release_sdram_region(r->r);
free(r);
}
}
struct mem_test_resource *mem_test_biggest_region(struct list_head *list)
{
struct mem_test_resource *r, *best = NULL;
resource_size_t size = 0;
list_for_each_entry(r, list, list) {
resource_size_t now = resource_size(r->r);
if (now > size) {
size = now;
best = r;
}
}
return best;
}
static void mem_test_report_failure(const char *failure_description,
resource_size_t expected_value,
resource_size_t actual_value,
volatile resource_size_t *address)
{
printf("FAILURE (%s): "
"expected 0x%08x, actual 0x%08x at address 0x%08x.\n",
failure_description, expected_value, actual_value,
(resource_size_t)address);
}
int mem_test_bus_integrity(resource_size_t _start,
resource_size_t _end)
{
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 */
};
volatile resource_size_t *start, *dummy, num_words, val, readback, offset,
offset2, pattern, temp, anti_pattern;
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) {
mem_test_report_failure("data line",
val, readback, start);
return -EIO;
}
*start = ~val;
*dummy = val;
readback = *start;
if (readback != ~val) {
mem_test_report_failure("data line",
~val, readback, 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) {
mem_test_report_failure("address bit stuck high",
pattern, temp, &start[offset]);
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)) {
mem_test_report_failure(
"address bit stuck low or shorted",
pattern, temp, &start[offset]);
return -EIO;
}
}
start[offset2] = pattern;
}
return 0;
}
static int update_progress(resource_size_t offset)
{
/* Only check every 4k to reduce overhead */
if (offset & (SZ_4K - 1))
return 0;
if (ctrlc())
return -EINTR;
show_progress(offset);
return 0;
}
int mem_test_moving_inversions(resource_size_t _start, resource_size_t _end)
{
volatile resource_size_t *start, num_words, offset, temp, anti_pattern;
int ret;
_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;
num_words = (_end - _start + 1)/sizeof(resource_size_t);
printf("Starting moving inversions test of RAM:\n"
"Fill with address, compare, fill with inverted address, compare again\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.
*/
init_progression_bar(3 * num_words);
/* Fill memory with a known pattern */
for (offset = 0; offset < num_words; offset++) {
ret = update_progress(offset);
if (ret)
return ret;
start[offset] = offset + 1;
}
/* Check each location and invert it for the second pass */
for (offset = 0; offset < num_words; offset++) {
ret = update_progress(num_words + offset);
if (ret)
return ret;
temp = start[offset];
if (temp != (offset + 1)) {
printf("\n");
mem_test_report_failure("read/write",
(offset + 1),
temp, &start[offset]);
return -EIO;
}
anti_pattern = ~(offset + 1);
start[offset] = anti_pattern;
}
/* Check each location for the inverted pattern and zero it */
for (offset = 0; offset < num_words; offset++) {
ret = update_progress(2 * num_words + offset);
if (ret)
return ret;
anti_pattern = ~(offset + 1);
temp = start[offset];
if (temp != anti_pattern) {
printf("\n");
mem_test_report_failure("read/write",
anti_pattern,
temp, &start[offset]);
return -EIO;
}
start[offset] = 0;
}
show_progress(3 * num_words);
/* end of progressbar */
printf("\n");
return 0;
}
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