mtd: nand: add mrvl-nand driver

The driver is taken from the Linux kernel, with the following changes :
 - all DMA removed
 - all asynchronous handling removed, including the interrupt handler,
   and the asynchronous state handling
 - pxa armada support removed

Most the kernel structure was kept, to ease up future fixes integration
from the kernel driver.

The driver is tested on a pxa3xx system development
board (aka. zylonite), and reading, writing, erasing, and bad block
management were tested.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/mtd/nand/Kconfig

@@ -97,6 +97,13 @@ config NAND_ORION
 	help
 	  Support for the Orion NAND controller, present in Kirkwood SoCs.
 
+config NAND_MRVL_NFC
+	bool
+	prompt "Marvell NAND driver"
+	depends on ARCH_PXA3XX
+	help
+	  Support for the PXA3xx NAND controller, present in pxa3xx SoCs.
+
 config NAND_ATMEL
 	bool
 	prompt "Atmel (AT91SAM9xxx) NAND driver"

drivers/mtd/nand/Makefile

@@ -11,6 +11,7 @@ obj-$(CONFIG_NAND_IMX)			+= nand_imx.o
 obj-$(CONFIG_NAND_IMX_BBM)		+= nand_imx_bbm.o
 obj-$(CONFIG_NAND_OMAP_GPMC)		+= nand_omap_gpmc.o nand_omap_bch_decoder.o
 obj-$(CONFIG_NAND_ORION)		+= nand_orion.o
+obj-$(CONFIG_NAND_MRVL_NFC)		+= nand_mrvl_nfc.o
 obj-$(CONFIG_NAND_ATMEL)		+= atmel_nand.o
 obj-$(CONFIG_NAND_S3C24XX)		+= nand_s3c24xx.o
 pbl-$(CONFIG_NAND_S3C24XX)		+= nand_s3c24xx.o

include/platform_data/mtd-nand-mrvl.h

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2014 Robert Jarzmik
+ *
+ * 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.
+ *
+ * Taken from linux kernel mostly.
+ */
+#ifndef __MRVL_NAND_H
+#define __MRVL_NAND_H
+
+struct mrvl_nand_timing {
+	uint16_t	id;   /* NAND id code (READID) */
+	unsigned int	tCH;  /* Enable signal hold time */
+	unsigned int	tCS;  /* Enable signal setup time */
+	unsigned int	tWH;  /* ND_nWE high duration */
+	unsigned int	tWP;  /* ND_nWE pulse time */
+	unsigned int	tRH;  /* ND_nRE high duration */
+	unsigned int	tRP;  /* ND_nRE pulse width */
+	unsigned int	tR;   /* ND_nWE high to ND_nRE low for read */
+	unsigned int	tWHR; /* ND_nWE high to ND_nRE low for status read */
+	unsigned int	tAR;  /* ND_ALE low to ND_nRE low delay */
+};
+
+struct mrvl_nand_flash {
+	char		*name;
+	uint32_t	chip_id;
+	unsigned int	page_per_block; /* Pages per block (PG_PER_BLK) */
+	unsigned int	page_size;	/* Page size in bytes (PAGE_SZ) */
+	unsigned int	flash_width;	/* Flash memory width (DWIDTH_M) */
+	unsigned int	dfc_width;	/* Flash controller width (DWIDTH_C) */
+	unsigned int	num_blocks;	/* Number of physical blocks in Flash */
+
+	struct mrvl_nand_timing *timing;	/* NAND Flash timing */
+};
+
+/*
+ * Current pxa3xx_nand controller has two chip select which
+ * both be workable.
+ *
+ * Notice should be taken that:
+ * When you want to use this feature, you should not enable the
+ * keep configuration feature, for two chip select could be
+ * attached with different nand chip. The different page size
+ * and timing requirement make the keep configuration impossible.
+ */
+
+/* The max num of chip select current support */
+#define NUM_CHIP_SELECT		(2)
+struct mrvl_nand_platform_data {
+	/* the data flash bus is shared between the Static Memory
+	 * Controller and the Data Flash Controller,  the arbiter
+	 * controls the ownership of the bus
+	 */
+	int	dwidth_c;
+	int	dwidth_m;
+
+	/* allow platform code to keep OBM/bootloader defined NFC config */
+	int	keep_config;
+
+	/* indicate how many chip selects will be used */
+	int	num_cs;
+
+	/* use an flash-based bad block table */
+	bool	flash_bbt;
+
+	/* requested ECC strength and ECC step size */
+	int ecc_strength, ecc_step_size;
+
+	const struct mtd_partition		*parts[NUM_CHIP_SELECT];
+	unsigned int				nr_parts[NUM_CHIP_SELECT];
+
+	const struct mrvl_nand_flash		*flash;
+	size_t					num_flash;
+};
+
+extern void mrvl_set_nand_info(struct mrvl_nand_platform_data *info);
+#endif /* __MRVL_NAND_H */