nand: add nand mtd concat support

add for nand devices mtd concat support. Generic MTD concat
support is already ported to mainline, and used in the cfi_mtd
driver. This patch adds it similiar for nand devices.

Signed-off-by: Heiko Schocher <hs@denx.de>

diff --git a/drivers/mtd/nand/nand.c b/drivers/mtd/nand/nand.c
index f449316853924b9f91eb0dd6bfbc1e7577b55e95..05512412b9404a886f5c4457ea43527c16d909aa 100644 (file)
--- a/drivers/mtd/nand/nand.c
+++ b/drivers/mtd/nand/nand.c
@@ -9,6 +9,7 @@
 #include <common.h>
 #include <nand.h>
 #include <errno.h>
+#include <linux/mtd/concat.h>
 
 #ifndef CONFIG_SYS_NAND_BASE_LIST
 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
@@ -92,6 +93,44 @@ static void nand_init_chip(int i)
 }
 #endif
 
+#ifdef CONFIG_MTD_CONCAT
+static void create_mtd_concat(void)
+{
+       struct mtd_info *nand_info_list[CONFIG_SYS_MAX_NAND_DEVICE];
+       int nand_devices_found = 0;
+       int i;
+
+       for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
+               if (nand_info[i] != NULL) {
+                       nand_info_list[nand_devices_found] = nand_info[i];
+                       nand_devices_found++;
+               }
+       }
+       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);
+
+               if (mtd == NULL)
+                       return;
+
+               nand_register(nand_devices_found, mtd);
+       }
+
+       return;
+}
+#else
+static void create_mtd_concat(void)
+{
+}
+#endif
+
 void nand_init(void)
 {
 #ifdef CONFIG_SYS_NAND_SELF_INIT
@@ -112,4 +151,6 @@ void nand_init(void)
        board_nand_select_device(mtd_to_nand(nand_info[nand_curr_device]),
                                 nand_curr_device);
 #endif
+
+       create_mtd_concat();
 }