mtd: nand: new base driver for memory mapped nand devices

The BF537-STAMP Blackfin board had a driver for working with NAND devices
that are simply memory mapped.  Since there is nothing Blackfin specific
about this, generalize the driver a bit so that everyone can leverage it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Scott Wood <scottwood@freescale.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/drivers/mtd/nand/nand_plat.c b/drivers/mtd/nand/nand_plat.c
new file mode 100644
index 0000000..b35492b
--- /dev/null
+++ b/drivers/mtd/nand/nand_plat.c
@@ -0,0 +1,53 @@
+/*
+ * Genericish driver for memory mapped NAND devices
+ *
+ * Copyright (c) 2006-2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+/* Your board must implement the following macros:
+ *  NAND_PLAT_WRITE_CMD(chip, cmd)
+ *  NAND_PLAT_WRITE_ADR(chip, cmd)
+ *  NAND_PLAT_INIT()
+ *
+ * It may also implement the following:
+ *  NAND_PLAT_DEV_READY(chip)
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#include <nand.h>
+
+static void plat_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+	struct nand_chip *this = mtd->priv;
+
+	if (cmd == NAND_CMD_NONE)
+		return;
+
+	if (ctrl & NAND_CLE)
+		NAND_PLAT_WRITE_CMD(this, cmd);
+	else
+		NAND_PLAT_WRITE_ADR(this, cmd);
+}
+
+#ifdef NAND_PLAT_DEV_READY
+static int plat_dev_ready(struct mtd_info *mtd)
+{
+	return NAND_PLAT_DEV_READY((struct nand_chip *)mtd->priv);
+}
+#else
+# define plat_dev_ready NULL
+#endif
+
+int board_nand_init(struct nand_chip *nand)
+{
+	NAND_PLAT_INIT();
+
+	nand->cmd_ctrl = plat_cmd_ctrl;
+	nand->dev_ready = plat_dev_ready;
+	nand->ecc.mode = NAND_ECC_SOFT;
+
+	return 0;
+}