[PATCH v2 12/15] nand: Allow reinitialization

[Sean Anderson]

NAND devices are destroyed in between unit tests. Provide a function to
reinitialize the subsystem at the beginning of each test.

Signed-off-by: Sean Anderson <seanga2 at gmail.com>
Reviewed-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>
---

(no changes since v1)

 drivers/mtd/nand/raw/nand.c | 40 ++++++++++++++++++++++++++++++-------
 include/nand.h              |  1 +
 2 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand.c b/drivers/mtd/nand/raw/nand.c
index 80017b3dddd..4c18861aa25 100644
--- a/drivers/mtd/nand/raw/nand.c
+++ b/drivers/mtd/nand/raw/nand.c
@@ -115,6 +115,8 @@ static void nand_init_chip(int i)
 #endif
 
 #ifdef CONFIG_MTD_CONCAT
+struct mtd_info *concat_mtd;
+
 static void create_mtd_concat(void)
 {
 	struct mtd_info *nand_info_list[CONFIG_SYS_MAX_NAND_DEVICE];
@@ -129,28 +131,40 @@ static void create_mtd_concat(void)
 		}
 	}
 	if (nand_devices_found > 1) {
-		struct mtd_info *mtd;
 		char c_mtd_name[16];
 
 		/*
 		 * We detected multiple devices. Concatenate them together.
 		 */
 		sprintf(c_mtd_name, "nand%d", nand_devices_found);
-		mtd = mtd_concat_create(nand_info_list, nand_devices_found,
-					c_mtd_name);
+		concat_mtd = mtd_concat_create(nand_info_list,
+					       nand_devices_found, c_mtd_name);
 
-		if (mtd == NULL)
+		if (!concat_mtd)
 			return;
 
-		nand_register(nand_devices_found, mtd);
+		nand_register(nand_devices_found, concat_mtd);
 	}
 
 	return;
 }
+
+static void destroy_mtd_concat(void)
+{
+	if (!concat_mtd)
+		return;
+
+	mtd_concat_destroy(concat_mtd);
+	concat_mtd = NULL;
+}
 #else
 static void create_mtd_concat(void)
 {
 }
+
+static void destroy_mtd_concat(void)
+{
+}
 #endif
 
 unsigned long nand_size(void)
@@ -158,10 +172,10 @@ unsigned long nand_size(void)
 	return total_nand_size;
 }
 
+static int initialized;
+
 void nand_init(void)
 {
-	static int initialized;
-
 	/*
 	 * Avoid initializing NAND Flash multiple times,
 	 * otherwise it will calculate a wrong total size.
@@ -190,6 +204,18 @@ void nand_init(void)
 	create_mtd_concat();
 }
 
+void nand_reinit(void)
+{
+	int i;
+
+	destroy_mtd_concat();
+	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
+		assert(!nand_info[i]);
+
+	initialized = 0;
+	nand_init();
+}
+
 unsigned int nand_page_size(void)
 {
 	struct mtd_info *mtd = get_nand_dev_by_index(nand_curr_device);
diff --git a/include/nand.h b/include/nand.h
index fc584f5ef7a..220ffa202ef 100644
--- a/include/nand.h
+++ b/include/nand.h
@@ -11,6 +11,7 @@
 #include <config.h>
 
 extern void nand_init(void);
+void nand_reinit(void);
 unsigned long nand_size(void);
 unsigned int nand_page_size(void);
 
-- 
2.37.1