diff options
Diffstat (limited to 'post/cpu/ppc4xx/ocm.c')
| -rw-r--r-- | post/cpu/ppc4xx/ocm.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/post/cpu/ppc4xx/ocm.c b/post/cpu/ppc4xx/ocm.c new file mode 100644 index 0000000000..88aa93ea1e --- /dev/null +++ b/post/cpu/ppc4xx/ocm.c @@ -0,0 +1,89 @@ +/* + * (C) Copyright 2008 Ilya Yanok, EmCraft Systems, yanok@emcraft.com + * + * Developed for DENX Software Engineering GmbH + * + * 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 as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ +#include <common.h> + +/* + * This test attempts to verify on-chip memory (OCM). Result is written + * to the scratch register and if test succeed it won't be run till next + * power on. + */ + +#include <post.h> + +#include <asm/io.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define OCM_TEST_PATTERN1 0x55555555 +#define OCM_TEST_PATTERN2 0xAAAAAAAA + +#if CONFIG_POST & CFG_POST_OCM + +static uint ocm_status_read(void) +{ + return in_be32((void *)CFG_OCM_STATUS_ADDR) & + CFG_OCM_STATUS_MASK; +} + +static void ocm_status_write(uint value) +{ + out_be32((void *)CFG_OCM_STATUS_ADDR, value | + (in_be32((void *)CFG_OCM_STATUS_ADDR) & + ~CFG_OCM_STATUS_MASK)); +} + +static inline int ocm_test_word(uint value, uint *address) +{ + uint read_value; + + *address = value; + sync(); + read_value = *address; + + return (read_value != value); +} + +int ocm_post_test(int flags) +{ + uint old_value; + int ret = 0; + uint *address = (uint*)CFG_OCM_BASE; + + if (ocm_status_read() == CFG_OCM_STATUS_OK) + return 0; + for (; address < (uint*)(CFG_OCM_BASE + CFG_OCM_SIZE); address++) { + old_value = *address; + if (ocm_test_word(OCM_TEST_PATTERN1, address) || + ocm_test_word(OCM_TEST_PATTERN2, address)) { + ret = 1; + *address = old_value; + printf("OCM POST failed at %p!\n", address); + break; + } + *address = old_value; + } + ocm_status_write(ret ? CFG_OCM_STATUS_FAIL : CFG_OCM_STATUS_OK); + return ret; +} +#endif /* CONFIG_POST & CFG_POST_OCM */ |
