cmd: nand: abstract global variable usage for dm conversion

nand_info is used all over the file so abstract it with
get_nand_dev_by_index() which will help for DM conversion.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>

cmd/nand.c

@@ -115,20 +115,20 @@ free_dat:
 
 static int set_dev(int dev)
 {
-	if (dev < 0 || dev >= CONFIG_SYS_MAX_NAND_DEVICE || !nand_info[dev]) {
-		puts("No such device\n");
-		return -1;
-	}
+	struct mtd_info *mtd = get_nand_dev_by_index(dev);
+
+	if (!mtd)
+		return -ENODEV;
 
 	if (nand_curr_device == dev)
 		return 0;
 
-	printf("Device %d: %s", dev, nand_info[dev]->name);
+	printf("Device %d: %s", dev, mtd->name);
 	puts("... is now current device\n");
 	nand_curr_device = dev;
 
 #ifdef CONFIG_SYS_NAND_SELECT_DEVICE
-	board_nand_select_device(nand_info[dev]->priv, dev);
+	board_nand_select_device(mtd->priv, dev);
 #endif
 
 	return 0;
@@ -188,7 +188,7 @@ int do_nand_env_oob(cmd_tbl_t *cmdtp, int argc, char *const argv[])
 {
 	int ret;
 	uint32_t oob_buf[ENV_OFFSET_SIZE/sizeof(uint32_t)];
-	struct mtd_info *mtd = nand_info[0];
+	struct mtd_info *mtd = get_nand_dev_by_index(0);
 	char *cmd = argv[1];
 
 	if (CONFIG_SYS_MAX_NAND_DEVICE == 0 || !mtd) {
@@ -213,9 +213,10 @@ int do_nand_env_oob(cmd_tbl_t *cmdtp, int argc, char *const argv[])
 		if (argc < 3)
 			goto usage;
 
+		mtd = get_nand_dev_by_index(idx);
 		/* We don't care about size, or maxsize. */
 		if (mtd_arg_off(argv[2], &idx, &addr, &maxsize, &maxsize,
-				MTD_DEV_TYPE_NAND, nand_info[idx]->size)) {
+				MTD_DEV_TYPE_NAND, mtd->size)) {
 			puts("Offset or partition name expected\n");
 			return 1;
 		}
@@ -283,9 +284,14 @@ usage:
 
 static void nand_print_and_set_info(int idx)
 {
-	struct mtd_info *mtd = nand_info[idx];
-	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct mtd_info *mtd;
+	struct nand_chip *chip;
 
+	mtd = get_nand_dev_by_index(idx);
+	if (!mtd)
+		return;
+
+	chip = mtd_to_nand(mtd);
 	printf("Device %d: ", idx);
 	if (chip->numchips > 1)
 		printf("%dx ", chip->numchips);
@@ -348,7 +354,7 @@ static void adjust_size_for_badblocks(loff_t *size, loff_t offset, int dev)
 	/* We grab the nand info object here fresh because this is usually
 	 * called after arg_off_size() which can change the value of dev.
 	 */
-	struct mtd_info *mtd = nand_info[dev];
+	struct mtd_info *mtd = get_nand_dev_by_index(dev);
 	loff_t maxoffset = offset + *size;
 	int badblocks = 0;
 
@@ -397,10 +403,8 @@ static int do_nand(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	if (strcmp(cmd, "info") == 0) {
 
 		putc('\n');
-		for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
-			if (nand_info[i])
-				nand_print_and_set_info(i);
-		}
+		for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
+			nand_print_and_set_info(i);
 		return 0;
 	}
 
@@ -432,12 +436,11 @@ static int do_nand(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	 * one before these commands can run, even if a partition specifier
 	 * for another device is to be used.
 	 */
-	if (dev < 0 || dev >= CONFIG_SYS_MAX_NAND_DEVICE ||
-	    !nand_info[dev]) {
+	mtd = get_nand_dev_by_index(dev);
+	if (!mtd) {
 		puts("\nno devices available\n");
 		return 1;
 	}
-	mtd = nand_info[dev];
 
 	if (strcmp(cmd, "bad") == 0) {
 		printf("\nDevice %d bad blocks:\n", dev);
@@ -496,13 +499,13 @@ static int do_nand(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		/* skip first two or three arguments, look for offset and size */
 		if (mtd_arg_off_size(argc - o, argv + o, &dev, &off, &size,
 				     &maxsize, MTD_DEV_TYPE_NAND,
-				     nand_info[dev]->size) != 0)
+				     mtd->size) != 0)
 			return 1;
 
 		if (set_dev(dev))
 			return 1;
 
-		mtd = nand_info[dev];
+		mtd = get_nand_dev_by_index(dev);
 
 		memset(&opts, 0, sizeof(opts));
 		opts.offset = off;
@@ -565,13 +568,13 @@ static int do_nand(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 
 			if (mtd_arg_off(argv[3], &dev, &off, &size, &maxsize,
 					MTD_DEV_TYPE_NAND,
-					nand_info[dev]->size))
+					mtd->size))
 				return 1;
 
 			if (set_dev(dev))
 				return 1;
 
-			mtd = nand_info[dev];
+			mtd = get_nand_dev_by_index(dev);
 
 			if (argc > 4 && !str2long(argv[4], &pagecount)) {
 				printf("'%s' is not a number\n", argv[4]);
@@ -588,7 +591,7 @@ static int do_nand(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 			if (mtd_arg_off_size(argc - 3, argv + 3, &dev, &off,
 					     &size, &maxsize,
 					     MTD_DEV_TYPE_NAND,
-					     nand_info[dev]->size) != 0)
+					     mtd->size) != 0)
 				return 1;
 
 			if (set_dev(dev))
@@ -600,7 +603,7 @@ static int do_nand(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 			rwsize = size;
 		}
 
-		mtd = nand_info[dev];
+		mtd = get_nand_dev_by_index(dev);
 
 		if (!s || !strcmp(s, ".jffs2") ||
 		    !strcmp(s, ".e") || !strcmp(s, ".i")) {
@@ -760,13 +763,15 @@ static int do_nand(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 
 		if (mtd_arg_off_size(argc - 2, argv + 2, &dev, &off, &size,
 				     &maxsize, MTD_DEV_TYPE_NAND,
-				     nand_info[dev]->size) < 0)
+				     mtd->size) < 0)
 			return 1;
 
 		if (set_dev(dev))
 			return 1;
 
-		if (!nand_unlock(nand_info[dev], off, size, allexcept)) {
+		mtd = get_nand_dev_by_index(dev);
+
+		if (!nand_unlock(mtd, off, size, allexcept)) {
 			puts("NAND flash successfully unlocked\n");
 		} else {
 			puts("Error unlocking NAND flash, "
@@ -929,6 +934,7 @@ static int do_nandboot(cmd_tbl_t *cmdtp, int flag, int argc,
 	char *boot_device = NULL;
 	int idx;
 	ulong addr, offset = 0;
+	struct mtd_info *mtd;
 #if defined(CONFIG_CMD_MTDPARTS)
 	struct mtd_device *dev;
 	struct part_info *part;
@@ -948,8 +954,10 @@ static int do_nandboot(cmd_tbl_t *cmdtp, int flag, int argc,
 				addr = simple_strtoul(argv[1], NULL, 16);
 			else
 				addr = CONFIG_SYS_LOAD_ADDR;
-			return nand_load_image(cmdtp, nand_info[dev->id->num],
-					       part->offset, addr, argv[0]);
+
+			mtd = get_nand_dev_by_index(dev->id->num);
+			return nand_load_image(cmdtp, mtd, part->offset,
+					       addr, argv[0]);
 		}
 	}
 #endif
@@ -991,14 +999,15 @@ usage:
 
 	idx = simple_strtoul(boot_device, NULL, 16);
 
-	if (idx < 0 || idx >= CONFIG_SYS_MAX_NAND_DEVICE || !nand_info[idx]) {
+	mtd = get_nand_dev_by_index(idx);
+	if (!mtd) {
 		printf("\n** Device %d not available\n", idx);
 		bootstage_error(BOOTSTAGE_ID_NAND_AVAILABLE);
 		return 1;
 	}
 	bootstage_mark(BOOTSTAGE_ID_NAND_AVAILABLE);
 
-	return nand_load_image(cmdtp, nand_info[idx], offset, addr, argv[0]);
+	return nand_load_image(cmdtp, mtd, offset, addr, argv[0]);
 }
 
 U_BOOT_CMD(nboot, 4, 1, do_nandboot,

drivers/mtd/nand/nand.c

@@ -19,7 +19,6 @@ DECLARE_GLOBAL_DATA_PTR;
 
 int nand_curr_device = -1;
 
-
 struct mtd_info *nand_info[CONFIG_SYS_MAX_NAND_DEVICE];
 
 #ifndef CONFIG_SYS_NAND_SELF_INIT
@@ -31,12 +30,21 @@ static char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
 
 static unsigned long total_nand_size; /* in kiB */
 
+struct mtd_info *get_nand_dev_by_index(int dev)
+{
+	if (dev < 0 || dev >= CONFIG_SYS_MAX_NAND_DEVICE || !nand_info[dev] ||
+	    !nand_info[dev]->name)
+		return NULL;
+
+	return nand_info[dev];
+}
+
 int nand_mtd_to_devnum(struct mtd_info *mtd)
 {
 	int i;
 
-	for (i = 0; i < ARRAY_SIZE(nand_info); i++) {
-		if (mtd && nand_info[i] == mtd)
+	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
+		if (mtd && get_nand_dev_by_index(i) == mtd)
 			return i;
 	}
 
@@ -101,8 +109,9 @@ static void create_mtd_concat(void)
 	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];
+		struct mtd_info *mtd = get_nand_dev_by_index(i);
+		if (mtd != NULL) {
+			nand_info_list[nand_devices_found] = mtd;
 			nand_devices_found++;
 		}
 	}
@@ -161,7 +170,7 @@ void nand_init(void)
 	/*
 	 * Select the chip in the board/cpu specific driver
 	 */
-	board_nand_select_device(mtd_to_nand(nand_info[nand_curr_device]),
+	board_nand_select_device(mtd_to_nand(get_nand_dev_by_index(nand_curr_device)),
 				 nand_curr_device);
 #endif
 

drivers/mtd/nand/omap_gpmc.c

@@ -894,17 +894,14 @@ static int omap_select_ecc_scheme(struct nand_chip *nand,
 int __maybe_unused omap_nand_switch_ecc(uint32_t hardware, uint32_t eccstrength)
 {
 	struct nand_chip *nand;
-	struct mtd_info *mtd;
+	struct mtd_info *mtd = get_nand_dev_by_index(nand_curr_device);
 	int err = 0;
 
-	if (nand_curr_device < 0 ||
-	    nand_curr_device >= CONFIG_SYS_MAX_NAND_DEVICE ||
-	    !nand_info[nand_curr_device]) {
+	if (!mtd) {
 		printf("nand: error: no NAND devices found\n");
 		return -ENODEV;
 	}
 
-	mtd = nand_info[nand_curr_device];
 	nand = mtd_to_nand(mtd);
 	nand->options |= NAND_OWN_BUFFERS;
 	nand->options &= ~NAND_SUBPAGE_READ;

include/nand.h

@@ -145,4 +145,13 @@ int spl_nand_erase_one(int block, int page);
 /* platform specific init functions */
 void sunxi_nand_init(void);
 
+/*
+ * get_nand_dev_by_index - Get the nand info based in index.
+ *
+ * @dev - index to the nand device.
+ *
+ * returns pointer to the nand device info structure or NULL on failure.
+ */
+struct mtd_info *get_nand_dev_by_index(int dev);
+
 #endif /* _NAND_H_ */