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-rw-r--r--post/cpu/ppc4xx/ocm.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/post/cpu/ppc4xx/ocm.c b/post/cpu/ppc4xx/ocm.c
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+++ b/post/cpu/ppc4xx/ocm.c
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+/*
+ * (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 */