mtd: nand: Allow caller to pass alternative ID table to nand_scan_ident()

This patch sync with David's patch on Linux for handling nand_scan_ident.

	commit 5e81e88a4c140586d9212999cea683bcd66a15c6
	Author: David Woodhouse <David.Woodhouse@intel.com>
	Date:   Fri Feb 26 18:32:56 2010 +0000

	mtd: nand: Allow caller to pass alternative ID table to nand_scan_ident()

	Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Lei Wen <leiwen@marvell.com>

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index d5eb54a..ab8bbb3 100644 (file)
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -296,7 +296,7 @@ int board_nand_init(struct nand_chip *nand)
        mtd->priv = nand;
 
        /* Detect NAND chips */
-       if (nand_scan_ident(mtd, 1)) {
+       if (nand_scan_ident(mtd, 1, NULL)) {
                printk(KERN_WARNING "NAND Flash not found !\n");
                return -ENXIO;
        }

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 5239c1f..3b96b0e 100644 (file)
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2414,10 +2414,10 @@ static void nand_set_defaults(struct nand_chip *chip, int busw)
  */
 static const struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
                                                  struct nand_chip *chip,
-                                                 int busw, int *maf_id)
+                                                 int busw, int *maf_id,
+                                                 const struct nand_flash_dev *type)
 {
-       const struct nand_flash_dev *type = NULL;
-       int i, dev_id, maf_idx;
+       int dev_id, maf_idx;
        int tmp_id, tmp_manf;
 
        /* Select the device */
@@ -2456,15 +2456,14 @@ static const struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
                return ERR_PTR(-ENODEV);
        }
 
-       /* Lookup the flash id */
-       for (i = 0; nand_flash_ids[i].name != NULL; i++) {
-               if (dev_id == nand_flash_ids[i].id) {
-                       type =  &nand_flash_ids[i];
-                       break;
-               }
-       }
+       if (!type)
+               type = nand_flash_ids;
+
+       for (; type->name != NULL; type++)
+               if (dev_id == type->id)
+                        break;
 
-       if (!type) {
+       if (!type->name) {
                /* supress warning if there is no nand */
                if (*maf_id != 0x00 && *maf_id != 0xff &&
                    dev_id  != 0x00 && dev_id  != 0xff)
@@ -2580,13 +2579,15 @@ static const struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
  * nand_scan_ident - [NAND Interface] Scan for the NAND device
  * @mtd:            MTD device structure
  * @maxchips:       Number of chips to scan for
+ * @table:          Alternative NAND ID table
  *
  * This is the first phase of the normal nand_scan() function. It
  * reads the flash ID and sets up MTD fields accordingly.
  *
  * The mtd->owner field must be set to the module of the caller.
  */
-int nand_scan_ident(struct mtd_info *mtd, int maxchips)
+int nand_scan_ident(struct mtd_info *mtd, int maxchips,
+                   const struct nand_flash_dev *table)
 {
        int i, busw, nand_maf_id;
        struct nand_chip *chip = mtd->priv;
@@ -2598,7 +2599,7 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips)
        nand_set_defaults(chip, busw);
 
        /* Read the flash type */
-       type = nand_get_flash_type(mtd, chip, busw, &nand_maf_id);
+       type = nand_get_flash_type(mtd, chip, busw, &nand_maf_id, table);
 
        if (IS_ERR(type)) {
 #ifndef CONFIG_SYS_NAND_QUIET_TEST
@@ -2869,7 +2870,7 @@ int nand_scan(struct mtd_info *mtd, int maxchips)
 {
        int ret;
 
-       ret = nand_scan_ident(mtd, maxchips);
+       ret = nand_scan_ident(mtd, maxchips, NULL);
        if (!ret)
                ret = nand_scan_tail(mtd);
        return ret;

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 1128f5a..d299929 100644 (file)
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -33,11 +33,13 @@
 
 
 struct mtd_info;
+struct nand_flash_dev;
 /* Scan and identify a NAND device */
 extern int nand_scan (struct mtd_info *mtd, int max_chips);
 /* Separate phases of nand_scan(), allowing board driver to intervene
  * and override command or ECC setup according to flash type */
-extern int nand_scan_ident(struct mtd_info *mtd, int max_chips);
+extern int nand_scan_ident(struct mtd_info *mtd, int max_chips,
+                          const struct nand_flash_dev *table);
 extern int nand_scan_tail(struct mtd_info *mtd);
 
 /* Free resources held by the NAND device */