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>
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;
+}