nand: Introduce CONFIG_SYS_NAND_SELF_INIT

This allows a driver to run code between nand_scan_ident() and
nand_scan_tail(), among other things.  See the additions to
doc/README.nand for details.

To allow a gradual transition, Boards that don't set
CONFIG_SYS_NAND_SELF_INIT will still be initialized the old way, but
new drivers should not require this, and existing drivers should be
converted when convenient.

Signed-off-by: Scott Wood <scottwood@freescale.com>

1 files changed, 59 insertions, 37 deletions

diff --git a/drivers/mtd/nand/nand.c b/drivers/mtd/nand/nand.c
index d987f4c85c..4cf4c1c707 100644
--- a/drivers/mtd/nand/nand.c
+++ b/drivers/mtd/nand/nand.c
@@ -23,6 +23,7 @@
 
 #include <common.h>
 #include <nand.h>
+#include <errno.h>
 
 #ifndef CONFIG_SYS_NAND_BASE_LIST
 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
@@ -31,63 +32,84 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 int nand_curr_device = -1;
+
+
 nand_info_t nand_info[CONFIG_SYS_MAX_NAND_DEVICE];
 
+#ifndef CONFIG_SYS_NAND_SELF_INIT
 static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
 static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
+#endif
+
+static char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
+
+static unsigned long total_nand_size; /* in kiB */
+
+/* Register an initialized NAND mtd device with the U-Boot NAND command. */
+int nand_register(int devnum)
+{
+	struct mtd_info *mtd;
+
+	if (devnum >= CONFIG_SYS_MAX_NAND_DEVICE)
+		return -EINVAL;
+
+	mtd = &nand_info[devnum];
+
+	sprintf(dev_name[devnum], "nand%d", devnum);
+	mtd->name = dev_name[devnum];
+
+#ifdef CONFIG_MTD_DEVICE
+	/*
+	 * Add MTD device so that we can reference it later
+	 * via the mtdcore infrastructure (e.g. ubi).
+	 */
+	add_mtd_device(mtd);
+#endif
+
+	total_nand_size += mtd->size / 1024;
 
-static const char default_nand_name[] = "nand";
-static __attribute__((unused)) char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
+	if (nand_curr_device == -1)
+		nand_curr_device = devnum;
+
+	return 0;
+}
 
-static void nand_init_chip(struct mtd_info *mtd, struct nand_chip *nand,
-			   ulong base_addr)
+#ifndef CONFIG_SYS_NAND_SELF_INIT
+static void nand_init_chip(int i)
 {
+	struct mtd_info *mtd = &nand_info[i];
+	struct nand_chip *nand = &nand_chip[i];
+	ulong base_addr = base_address[i];
 	int maxchips = CONFIG_SYS_NAND_MAX_CHIPS;
-	static int __attribute__((unused)) i = 0;
 
 	if (maxchips < 1)
 		maxchips = 1;
-	mtd->priv = nand;
 
+	mtd->priv = nand;
 	nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;
-	if (board_nand_init(nand) == 0) {
-		if (nand_scan(mtd, maxchips) == 0) {
-			if (!mtd->name)
-				mtd->name = (char *)default_nand_name;
-#ifdef CONFIG_NEEDS_MANUAL_RELOC
-			else
-				mtd->name += gd->reloc_off;
-#endif
 
-#ifdef CONFIG_MTD_DEVICE
-			/*
-			 * Add MTD device so that we can reference it later
-			 * via the mtdcore infrastructure (e.g. ubi).
-			 */
-			sprintf(dev_name[i], "nand%d", i);
-			mtd->name = dev_name[i++];
-			add_mtd_device(mtd);
-#endif
-		} else
-			mtd->name = NULL;
-	} else {
-		mtd->name = NULL;
-		mtd->size = 0;
-	}
+	if (board_nand_init(nand))
+		return;
 
+	if (nand_scan(mtd, maxchips))
+		return;
+
+	nand_register(i);
 }
+#endif
 
 void nand_init(void)
 {
+#ifdef CONFIG_SYS_NAND_SELF_INIT
+	board_nand_init();
+#else
 	int i;
-	unsigned int size = 0;
-	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++) {
-		nand_init_chip(&nand_info[i], &nand_chip[i], base_address[i]);
-		size += nand_info[i].size / 1024;
-		if (nand_curr_device == -1)
-			nand_curr_device = i;
-	}
-	printf("%u MiB\n", size / 1024);
+
+	for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
+		nand_init_chip(i);
+#endif
+
+	printf("%lu MiB\n", total_nand_size / 1024);
 
 #ifdef CONFIG_SYS_NAND_SELECT_DEVICE
 	/*