LXR uboot/post/cpu/ppc4xx/ocm.c

   1/*
   2 * (C) Copyright 2008 Ilya Yanok, EmCraft Systems, yanok@emcraft.com
   3 *
   4 * Developed for DENX Software Engineering GmbH
   5 *
   6 * SPDX-License-Identifier:     GPL-2.0+
   7 */
   8#include <common.h>
   9
  10/*
  11 * This test attempts to verify on-chip memory (OCM). Result is written
  12 * to the scratch register and if test succeed it won't be run till next
  13 * power on.
  14 */
  15
  16#include <post.h>
  17
  18#include <asm/io.h>
  19
  20DECLARE_GLOBAL_DATA_PTR;
  21
  22#define OCM_TEST_PATTERN1       0x55555555
  23#define OCM_TEST_PATTERN2       0xAAAAAAAA
  24
  25#if CONFIG_POST & CONFIG_SYS_POST_OCM
  26
  27static uint ocm_status_read(void)
  28{
  29        return in_be32((void *)CONFIG_SYS_OCM_STATUS_ADDR) &
  30                CONFIG_SYS_OCM_STATUS_MASK;
  31}
  32
  33static void ocm_status_write(uint value)
  34{
  35        out_be32((void *)CONFIG_SYS_OCM_STATUS_ADDR, value |
  36                (in_be32((void *)CONFIG_SYS_OCM_STATUS_ADDR) &
  37                        ~CONFIG_SYS_OCM_STATUS_MASK));
  38}
  39
  40static inline int ocm_test_word(uint value, uint *address)
  41{
  42        uint read_value;
  43
  44        *address = value;
  45        sync();
  46        read_value = *address;
  47
  48        return (read_value != value);
  49}
  50
  51int ocm_post_test(int flags)
  52{
  53        uint   old_value;
  54        int    ret = 0;
  55        uint  *address = (uint*)CONFIG_SYS_OCM_BASE;
  56
  57        if (ocm_status_read() == CONFIG_SYS_OCM_STATUS_OK)
  58                return 0;
  59        for (; address < (uint*)(CONFIG_SYS_OCM_BASE + CONFIG_SYS_OCM_SIZE); address++) {
  60                old_value = *address;
  61                if (ocm_test_word(OCM_TEST_PATTERN1, address) ||
  62                                ocm_test_word(OCM_TEST_PATTERN2, address)) {
  63                        ret = 1;
  64                        *address = old_value;
  65                        printf("OCM POST failed at %p!\n", address);
  66                        break;
  67                }
  68                *address = old_value;
  69        }
  70        ocm_status_write(ret ? CONFIG_SYS_OCM_STATUS_FAIL : CONFIG_SYS_OCM_STATUS_OK);
  71        return ret;
  72}
  73#endif /* CONFIG_POST & CONFIG_SYS_POST_OCM */
  74