oxnas: clean-up NAND driver to fix probing issue

A re-write of the driver based on xway_nand.c and constants as
well as the cmd_ctrl() function from the original oxnas_nand.c
resulted in a extremely similar looking file (see diffsize),
and fixes the issue of NAND not being detected on newer kernels.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

SVN-Revision: 48986

target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c

@@ -2,15 +2,18 @@
  *  This program is free software; you can redistribute it and/or modify it
  *  under the terms of the GNU General Public License version 2 as published
  *  by the Free Software Foundation.
+ *
+ *  based on xway_nand.c
+ *  Copyright © 2012 John Crispin <blogic@openwrt.org>
+ *  and oxnas_nand.c "NAND glue for Oxnas platforms"
+ *  written by Ma Haijun <mahaijuns@gmail.com>
  */
 
-#include <linux/module.h>
 #include <linux/mtd/nand.h>
 #include <linux/of_gpio.h>
 #include <linux/of_platform.h>
 #include <linux/clk.h>
 #include <linux/reset.h>
-#include <mach/utils.h>
 
 /* nand commands */
 #define NAND_CMD_ALE		BIT(18)
@@ -89,14 +92,3 @@ static int __init oxnas_register_nand(void)
 }
 
 subsys_initcall(oxnas_register_nand);
-
-static const struct of_device_id oxnas_nand_ids[] = {
-	{ .compatible = "plxtech,nand-nas782x"},
-	{ /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, oxnas_nand_ids);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Ma Haijun");
-MODULE_DESCRIPTION("NAND glue for Oxnas platforms");
-MODULE_ALIAS("platform:oxnas_nand");