post: new nor flash test

This adds a simple flash test to automatically verify erasing,
writing, and reading of sectors.  The code is based on existing
Blackfin tests but generalized for everyone to use.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2 files changed, 108 insertions, 1 deletions

diff --git a/post/drivers/Makefile b/post/drivers/Makefile
index 0d87ae0..85d6c03 100644
--- a/post/drivers/Makefile
+++ b/post/drivers/Makefile
@@ -24,6 +24,6 @@ include $(TOPDIR)/config.mk
 
 LIB	= libpostdrivers.o
 
-COBJS-$(CONFIG_HAS_POST)	+= i2c.o memory.o rtc.o
+COBJS-$(CONFIG_HAS_POST)	+= flash.o i2c.o memory.o rtc.o
 
 include $(TOPDIR)/post/rules.mk
diff --git a/post/drivers/flash.c b/post/drivers/flash.c
new file mode 100644
index 0000000..07eab33
--- /dev/null
+++ b/post/drivers/flash.c
@@ -0,0 +1,107 @@
+/*
+ * Parallel NOR Flash tests
+ *
+ * Copyright (c) 2005-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <post.h>
+#include <flash.h>
+
+#if CONFIG_POST & CONFIG_SYS_POST_FLASH
+
+/*
+ * This code will walk over the declared sectors erasing them,
+ * then programming them, then verifying the written contents.
+ * Possible future work:
+ *  - verify sectors before/after are not erased/written
+ *  - verify partial writes (e.g. programming only middle of sector)
+ *  - verify the contents of the erased sector
+ *  - better seed pattern than 0x00..0xff
+ */
+
+#ifndef CONFIG_SYS_POST_FLASH_NUM
+# define CONFIG_SYS_POST_FLASH_NUM 0
+#endif
+#if CONFIG_SYS_POST_FLASH_START >= CONFIG_SYS_POST_FLASH_END
+# error "invalid flash block start/end"
+#endif
+
+extern flash_info_t flash_info[];
+
+static void *seed_src_data(void *ptr, ulong *old_len, ulong new_len)
+{
+	unsigned char *p;
+	ulong i;
+
+	p = ptr = realloc(ptr, new_len);
+	if (!ptr)
+		return ptr;
+
+	for (i = *old_len; i < new_len; ++i)
+		p[i] = i;
+
+	*old_len = new_len;
+
+	return ptr;
+}
+
+int flash_post_test(int flags)
+{
+	ulong len;
+	void *src;
+	int ret, n, n_start, n_end;
+	flash_info_t *info;
+
+	/* the output from the common flash layers needs help */
+	puts("\n");
+
+	len = 0;
+	src = NULL;
+	info = &flash_info[CONFIG_SYS_POST_FLASH_NUM];
+	n_start = CONFIG_SYS_POST_FLASH_START;
+	n_end = CONFIG_SYS_POST_FLASH_END;
+
+	for (n = n_start; n < n_end; ++n) {
+		ulong s_start, s_len, s_off;
+
+		s_start = info->start[n];
+		s_len = flash_sector_size(info, n);
+		s_off = s_start - info->start[0];
+
+		src = seed_src_data(src, &len, s_len);
+		if (!src) {
+			printf("malloc(%#lx) failed\n", s_len);
+			return 1;
+		}
+
+		printf("\tsector %i: %#lx +%#lx", n, s_start, s_len);
+
+		ret = flash_erase(info, n, n + 1);
+		if (ret) {
+			flash_perror(ret);
+			break;
+		}
+
+		ret = write_buff(info, src, s_start, s_len);
+		if (ret) {
+			flash_perror(ret);
+			break;
+		}
+
+		ret = memcmp(src, (void *)s_start, s_len);
+		if (ret) {
+			printf(" verify failed with %i\n", ret);
+			break;
+		}
+	}
+
+	free(src);
+
+	return ret;
+}
+
+#endif