drivers/mtd/nand/ppchameleonevb.c - kernel/mindspeed - Git at Google

 /*
  *  drivers/mtd/nand/ppchameleonevb.c
  *
  *  Copyright (C) 2003 DAVE Srl (info@wawnet.biz)
  *
  *  Derived from drivers/mtd/nand/edb7312.c
  *
  *
  * 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.
  *
  *  Overview:
  *   This is a device driver for the NAND flash devices found on the
  *   PPChameleon/PPChameleonEVB system.
  *   PPChameleon options (autodetected):
  *   - BA model: no NAND
  *   - ME model: 32MB (Samsung K9F5608U0B)
  *   - HI model: 128MB (Samsung K9F1G08UOM)
  *   PPChameleonEVB options:
  *   - 32MB (Samsung K9F5608U0B)
  */

 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
 #include <asm/io.h>
 #include <platforms/PPChameleonEVB.h>

 #undef USE_READY_BUSY_PIN
 #define USE_READY_BUSY_PIN
 /* see datasheets (tR) */
 #define NAND_BIG_DELAY_US		25
 #define NAND_SMALL_DELAY_US		10

 /* handy sizes */
 #define SZ_4M                           0x00400000
 #define NAND_SMALL_SIZE                 0x02000000
 #define NAND_MTD_NAME		"ppchameleon-nand"
 #define NAND_EVB_MTD_NAME	"ppchameleonevb-nand"

 /* GPIO pins used to drive NAND chip mounted on processor module */
 #define NAND_nCE_GPIO_PIN 		(0x80000000 >> 1)
 #define NAND_CLE_GPIO_PIN 		(0x80000000 >> 2)
 #define NAND_ALE_GPIO_PIN 		(0x80000000 >> 3)
 #define NAND_RB_GPIO_PIN 		(0x80000000 >> 4)
 /* GPIO pins used to drive NAND chip mounted on EVB */
 #define NAND_EVB_nCE_GPIO_PIN 	(0x80000000 >> 14)
 #define NAND_EVB_CLE_GPIO_PIN 	(0x80000000 >> 15)
 #define NAND_EVB_ALE_GPIO_PIN 	(0x80000000 >> 16)
 #define NAND_EVB_RB_GPIO_PIN 	(0x80000000 >> 31)

 /*
  * MTD structure for PPChameleonEVB board
  */
 static struct mtd_info *ppchameleon_mtd = NULL;
 static struct mtd_info *ppchameleonevb_mtd = NULL;

 /*
  * Module stuff
  */
 static unsigned long ppchameleon_fio_pbase = CFG_NAND0_PADDR;
 static unsigned long ppchameleonevb_fio_pbase = CFG_NAND1_PADDR;

 #ifdef MODULE
 module_param(ppchameleon_fio_pbase, ulong, 0);
 module_param(ppchameleonevb_fio_pbase, ulong, 0);
 #else
 __setup("ppchameleon_fio_pbase=", ppchameleon_fio_pbase);
 __setup("ppchameleonevb_fio_pbase=", ppchameleonevb_fio_pbase);
 #endif

 /*
  * Define static partitions for flash devices
  */
 static struct mtd_partition partition_info_hi[] = {
       { .name = "PPChameleon HI Nand Flash",
 	.offset = 0,
 	.size = 128 * 1024 * 1024
       }
 };

 static struct mtd_partition partition_info_me[] = {
       { .name = "PPChameleon ME Nand Flash",
 	.offset = 0,
 	.size = 32 * 1024 * 1024
       }
 };

 static struct mtd_partition partition_info_evb[] = {
       { .name = "PPChameleonEVB Nand Flash",
 	.offset = 0,
 	.size = 32 * 1024 * 1024
       }
 };

 #define NUM_PARTITIONS 1

 /*
  *	hardware specific access to control-lines
  */
 static void ppchameleon_hwcontrol(struct mtd_info *mtdinfo, int cmd,
 				  unsigned int ctrl)
 {
 	struct nand_chip *chip = mtd->priv;

 	if (ctrl & NAND_CTRL_CHANGE) {
 #error Missing headerfiles. No way to fix this. -tglx
 		switch (cmd) {
 		case NAND_CTL_SETCLE:
 			MACRO_NAND_CTL_SETCLE((unsigned long)CFG_NAND0_PADDR);
 			break;
 		case NAND_CTL_CLRCLE:
 			MACRO_NAND_CTL_CLRCLE((unsigned long)CFG_NAND0_PADDR);
 			break;
 		case NAND_CTL_SETALE:
 			MACRO_NAND_CTL_SETALE((unsigned long)CFG_NAND0_PADDR);
 			break;
 		case NAND_CTL_CLRALE:
 			MACRO_NAND_CTL_CLRALE((unsigned long)CFG_NAND0_PADDR);
 			break;
 		case NAND_CTL_SETNCE:
 			MACRO_NAND_ENABLE_CE((unsigned long)CFG_NAND0_PADDR);
 			break;
 		case NAND_CTL_CLRNCE:
 			MACRO_NAND_DISABLE_CE((unsigned long)CFG_NAND0_PADDR);
 			break;
 		}
 	}
 	if (cmd != NAND_CMD_NONE)
 		writeb(cmd, chip->IO_ADDR_W);
 }

 static void ppchameleonevb_hwcontrol(struct mtd_info *mtdinfo, int cmd,
 				     unsigned int ctrl)
 {
 	struct nand_chip *chip = mtd->priv;

 	if (ctrl & NAND_CTRL_CHANGE) {
 #error Missing headerfiles. No way to fix this. -tglx
 		switch (cmd) {
 		case NAND_CTL_SETCLE:
 			MACRO_NAND_CTL_SETCLE((unsigned long)CFG_NAND1_PADDR);
 			break;
 		case NAND_CTL_CLRCLE:
 			MACRO_NAND_CTL_CLRCLE((unsigned long)CFG_NAND1_PADDR);
 			break;
 		case NAND_CTL_SETALE:
 			MACRO_NAND_CTL_SETALE((unsigned long)CFG_NAND1_PADDR);
 			break;
 		case NAND_CTL_CLRALE:
 			MACRO_NAND_CTL_CLRALE((unsigned long)CFG_NAND1_PADDR);
 			break;
 		case NAND_CTL_SETNCE:
 			MACRO_NAND_ENABLE_CE((unsigned long)CFG_NAND1_PADDR);
 			break;
 		case NAND_CTL_CLRNCE:
 			MACRO_NAND_DISABLE_CE((unsigned long)CFG_NAND1_PADDR);
 			break;
 		}
 	}
 	if (cmd != NAND_CMD_NONE)
 		writeb(cmd, chip->IO_ADDR_W);
 }

 #ifdef USE_READY_BUSY_PIN
 /*
  *	read device ready pin
  */
 static int ppchameleon_device_ready(struct mtd_info *minfo)
 {
 	if (in_be32((volatile unsigned *)GPIO0_IR) & NAND_RB_GPIO_PIN)
 		return 1;
 	return 0;
 }

 static int ppchameleonevb_device_ready(struct mtd_info *minfo)
 {
 	if (in_be32((volatile unsigned *)GPIO0_IR) & NAND_EVB_RB_GPIO_PIN)
 		return 1;
 	return 0;
 }
 #endif

 /*
  * Main initialization routine
  */
 static int __init ppchameleonevb_init(void)
 {
 	struct nand_chip *this;
 	void __iomem *ppchameleon_fio_base;
 	void __iomem *ppchameleonevb_fio_base;

 	/*********************************
 	* Processor module NAND (if any) *
 	*********************************/
 	/* Allocate memory for MTD device structure and private data */
 	ppchameleon_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 	if (!ppchameleon_mtd) {
 		printk("Unable to allocate PPChameleon NAND MTD device structure.\n");
 		return -ENOMEM;
 	}

 	/* map physical address */
 	ppchameleon_fio_base = ioremap(ppchameleon_fio_pbase, SZ_4M);
 	if (!ppchameleon_fio_base) {
 		printk("ioremap PPChameleon NAND flash failed\n");
 		kfree(ppchameleon_mtd);
 		return -EIO;
 	}

 	/* Get pointer to private data */
 	this = (struct nand_chip *)(&ppchameleon_mtd[1]);

 	/* Initialize structures */
 	memset(ppchameleon_mtd, 0, sizeof(struct mtd_info));
 	memset(this, 0, sizeof(struct nand_chip));

 	/* Link the private data with the MTD structure */
 	ppchameleon_mtd->priv = this;
 	ppchameleon_mtd->owner = THIS_MODULE;

 	/* Initialize GPIOs */
 	/* Pin mapping for NAND chip */
 	/*
 	   CE   GPIO_01
 	   CLE  GPIO_02
 	   ALE  GPIO_03
 	   R/B  GPIO_04
 	 */
 	/* output select */
 	out_be32((volatile unsigned *)GPIO0_OSRH, in_be32((volatile unsigned *)GPIO0_OSRH) & 0xC0FFFFFF);
 	/* three-state select */
 	out_be32((volatile unsigned *)GPIO0_TSRH, in_be32((volatile unsigned *)GPIO0_TSRH) & 0xC0FFFFFF);
 	/* enable output driver */
 	out_be32((volatile unsigned *)GPIO0_TCR,
 		 in_be32((volatile unsigned *)GPIO0_TCR) | NAND_nCE_GPIO_PIN | NAND_CLE_GPIO_PIN | NAND_ALE_GPIO_PIN);
 #ifdef USE_READY_BUSY_PIN
 	/* three-state select */
 	out_be32((volatile unsigned *)GPIO0_TSRH, in_be32((volatile unsigned *)GPIO0_TSRH) & 0xFF3FFFFF);
 	/* high-impedecence */
 	out_be32((volatile unsigned *)GPIO0_TCR, in_be32((volatile unsigned *)GPIO0_TCR) & (~NAND_RB_GPIO_PIN));
 	/* input select */
 	out_be32((volatile unsigned *)GPIO0_ISR1H,
 		 (in_be32((volatile unsigned *)GPIO0_ISR1H) & 0xFF3FFFFF) | 0x00400000);
 #endif

 	/* insert callbacks */
 	this->IO_ADDR_R = ppchameleon_fio_base;
 	this->IO_ADDR_W = ppchameleon_fio_base;
 	this->cmd_ctrl = ppchameleon_hwcontrol;
 #ifdef USE_READY_BUSY_PIN
 	this->dev_ready = ppchameleon_device_ready;
 #endif
 	this->chip_delay = NAND_BIG_DELAY_US;
 	/* ECC mode */
 	this->ecc.mode = NAND_ECC_SOFT;

 	/* Scan to find existence of the device (it could not be mounted) */
 	if (nand_scan(ppchameleon_mtd, 1)) {
 		iounmap((void *)ppchameleon_fio_base);
 		ppchameleon_fio_base = NULL;
 		kfree(ppchameleon_mtd);
 		goto nand_evb_init;
 	}
 #ifndef USE_READY_BUSY_PIN
 	/* Adjust delay if necessary */
 	if (ppchameleon_mtd->size == NAND_SMALL_SIZE)
 		this->chip_delay = NAND_SMALL_DELAY_US;
 #endif

 	ppchameleon_mtd->name = "ppchameleon-nand";

 	/* Register the partitions */
 	mtd_device_parse_register(ppchameleon_mtd, NULL, 0,
 			ppchameleon_mtd->size == NAND_SMALL_SIZE ?
 				partition_info_me :
 				partition_info_hi,
 			NUM_PARTITIONS);

  nand_evb_init:
 	/****************************
 	* EVB NAND (always present) *
 	****************************/
 	/* Allocate memory for MTD device structure and private data */
 	ppchameleonevb_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
 	if (!ppchameleonevb_mtd) {
 		printk("Unable to allocate PPChameleonEVB NAND MTD device structure.\n");
 		if (ppchameleon_fio_base)
 			iounmap(ppchameleon_fio_base);
 		return -ENOMEM;
 	}

 	/* map physical address */
 	ppchameleonevb_fio_base = ioremap(ppchameleonevb_fio_pbase, SZ_4M);
 	if (!ppchameleonevb_fio_base) {
 		printk("ioremap PPChameleonEVB NAND flash failed\n");
 		kfree(ppchameleonevb_mtd);
 		if (ppchameleon_fio_base)
 			iounmap(ppchameleon_fio_base);
 		return -EIO;
 	}

 	/* Get pointer to private data */
 	this = (struct nand_chip *)(&ppchameleonevb_mtd[1]);

 	/* Initialize structures */
 	memset(ppchameleonevb_mtd, 0, sizeof(struct mtd_info));
 	memset(this, 0, sizeof(struct nand_chip));

 	/* Link the private data with the MTD structure */
 	ppchameleonevb_mtd->priv = this;

 	/* Initialize GPIOs */
 	/* Pin mapping for NAND chip */
 	/*
 	   CE   GPIO_14
 	   CLE  GPIO_15
 	   ALE  GPIO_16
 	   R/B  GPIO_31
 	 */
 	/* output select */
 	out_be32((volatile unsigned *)GPIO0_OSRH, in_be32((volatile unsigned *)GPIO0_OSRH) & 0xFFFFFFF0);
 	out_be32((volatile unsigned *)GPIO0_OSRL, in_be32((volatile unsigned *)GPIO0_OSRL) & 0x3FFFFFFF);
 	/* three-state select */
 	out_be32((volatile unsigned *)GPIO0_TSRH, in_be32((volatile unsigned *)GPIO0_TSRH) & 0xFFFFFFF0);
 	out_be32((volatile unsigned *)GPIO0_TSRL, in_be32((volatile unsigned *)GPIO0_TSRL) & 0x3FFFFFFF);
 	/* enable output driver */
 	out_be32((volatile unsigned *)GPIO0_TCR, in_be32((volatile unsigned *)GPIO0_TCR) | NAND_EVB_nCE_GPIO_PIN |
 		 NAND_EVB_CLE_GPIO_PIN | NAND_EVB_ALE_GPIO_PIN);
 #ifdef USE_READY_BUSY_PIN
 	/* three-state select */
 	out_be32((volatile unsigned *)GPIO0_TSRL, in_be32((volatile unsigned *)GPIO0_TSRL) & 0xFFFFFFFC);
 	/* high-impedecence */
 	out_be32((volatile unsigned *)GPIO0_TCR, in_be32((volatile unsigned *)GPIO0_TCR) & (~NAND_EVB_RB_GPIO_PIN));
 	/* input select */
 	out_be32((volatile unsigned *)GPIO0_ISR1L,
 		 (in_be32((volatile unsigned *)GPIO0_ISR1L) & 0xFFFFFFFC) | 0x00000001);
 #endif

 	/* insert callbacks */
 	this->IO_ADDR_R = ppchameleonevb_fio_base;
 	this->IO_ADDR_W = ppchameleonevb_fio_base;
 	this->cmd_ctrl = ppchameleonevb_hwcontrol;
 #ifdef USE_READY_BUSY_PIN
 	this->dev_ready = ppchameleonevb_device_ready;
 #endif
 	this->chip_delay = NAND_SMALL_DELAY_US;

 	/* ECC mode */
 	this->ecc.mode = NAND_ECC_SOFT;

 	/* Scan to find existence of the device */
 	if (nand_scan(ppchameleonevb_mtd, 1)) {
 		iounmap((void *)ppchameleonevb_fio_base);
 		kfree(ppchameleonevb_mtd);
 		if (ppchameleon_fio_base)
 			iounmap(ppchameleon_fio_base);
 		return -ENXIO;
 	}

 	ppchameleonevb_mtd->name = NAND_EVB_MTD_NAME;

 	/* Register the partitions */
 	mtd_device_parse_register(ppchameleonevb_mtd, NULL, 0,
 			ppchameleon_mtd->size == NAND_SMALL_SIZE ?
 				partition_info_me :
 				partition_info_hi,
 			NUM_PARTITIONS);

 	/* Return happy */
 	return 0;
 }

 module_init(ppchameleonevb_init);

 /*
  * Clean up routine
  */
 static void __exit ppchameleonevb_cleanup(void)
 {
 	struct nand_chip *this;

 	/* Release resources, unregister device(s) */
 	nand_release(ppchameleon_mtd);
 	nand_release(ppchameleonevb_mtd);

 	/* Release iomaps */
 	this = (struct nand_chip *) &ppchameleon_mtd[1];
 	iounmap((void *) this->IO_ADDR_R);
 	this = (struct nand_chip *) &ppchameleonevb_mtd[1];
 	iounmap((void *) this->IO_ADDR_R);

 	/* Free the MTD device structure */
 	kfree (ppchameleon_mtd);
 	kfree (ppchameleonevb_mtd);
 }
 module_exit(ppchameleonevb_cleanup);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("DAVE Srl <support-ppchameleon@dave-tech.it>");
 MODULE_DESCRIPTION("MTD map driver for DAVE Srl PPChameleonEVB board");
	/*
	* drivers/mtd/nand/ppchameleonevb.c
	*
	* Copyright (C) 2003 DAVE Srl (info@wawnet.biz)
	*
	* Derived from drivers/mtd/nand/edb7312.c
	*
	*
	* 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.
	*
	* Overview:
	* This is a device driver for the NAND flash devices found on the
	* PPChameleon/PPChameleonEVB system.
	* PPChameleon options (autodetected):
	* - BA model: no NAND
	* - ME model: 32MB (Samsung K9F5608U0B)
	* - HI model: 128MB (Samsung K9F1G08UOM)
	* PPChameleonEVB options:
	* - 32MB (Samsung K9F5608U0B)
	*/

	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/mtd/mtd.h>
	#include <linux/mtd/nand.h>
	#include <linux/mtd/partitions.h>
	#include <asm/io.h>
	#include <platforms/PPChameleonEVB.h>

	#undef USE_READY_BUSY_PIN
	#define USE_READY_BUSY_PIN
	/* see datasheets (tR) */
	#define NAND_BIG_DELAY_US 25
	#define NAND_SMALL_DELAY_US 10

	/* handy sizes */
	#define SZ_4M 0x00400000
	#define NAND_SMALL_SIZE 0x02000000
	#define NAND_MTD_NAME "ppchameleon-nand"
	#define NAND_EVB_MTD_NAME "ppchameleonevb-nand"

	/* GPIO pins used to drive NAND chip mounted on processor module */
	#define NAND_nCE_GPIO_PIN (0x80000000 >> 1)
	#define NAND_CLE_GPIO_PIN (0x80000000 >> 2)
	#define NAND_ALE_GPIO_PIN (0x80000000 >> 3)
	#define NAND_RB_GPIO_PIN (0x80000000 >> 4)
	/* GPIO pins used to drive NAND chip mounted on EVB */
	#define NAND_EVB_nCE_GPIO_PIN (0x80000000 >> 14)
	#define NAND_EVB_CLE_GPIO_PIN (0x80000000 >> 15)
	#define NAND_EVB_ALE_GPIO_PIN (0x80000000 >> 16)
	#define NAND_EVB_RB_GPIO_PIN (0x80000000 >> 31)

	/*
	* MTD structure for PPChameleonEVB board
	*/
	static struct mtd_info *ppchameleon_mtd = NULL;
	static struct mtd_info *ppchameleonevb_mtd = NULL;

	/*
	* Module stuff
	*/
	static unsigned long ppchameleon_fio_pbase = CFG_NAND0_PADDR;
	static unsigned long ppchameleonevb_fio_pbase = CFG_NAND1_PADDR;

	#ifdef MODULE
	module_param(ppchameleon_fio_pbase, ulong, 0);
	module_param(ppchameleonevb_fio_pbase, ulong, 0);
	#else
	__setup("ppchameleon_fio_pbase=", ppchameleon_fio_pbase);
	__setup("ppchameleonevb_fio_pbase=", ppchameleonevb_fio_pbase);
	#endif

	/*
	* Define static partitions for flash devices
	*/
	static struct mtd_partition partition_info_hi[] = {
	{ .name = "PPChameleon HI Nand Flash",
	.offset = 0,
	.size = 128 * 1024 * 1024
	}
	};

	static struct mtd_partition partition_info_me[] = {
	{ .name = "PPChameleon ME Nand Flash",
	.offset = 0,
	.size = 32 * 1024 * 1024
	}
	};

	static struct mtd_partition partition_info_evb[] = {
	{ .name = "PPChameleonEVB Nand Flash",
	.offset = 0,
	.size = 32 * 1024 * 1024
	}
	};

	#define NUM_PARTITIONS 1

	/*
	* hardware specific access to control-lines
	*/
	static void ppchameleon_hwcontrol(struct mtd_info *mtdinfo, int cmd,
	unsigned int ctrl)
	{
	struct nand_chip *chip = mtd->priv;

	if (ctrl & NAND_CTRL_CHANGE) {
	#error Missing headerfiles. No way to fix this. -tglx
	switch (cmd) {
	case NAND_CTL_SETCLE:
	MACRO_NAND_CTL_SETCLE((unsigned long)CFG_NAND0_PADDR);
	break;
	case NAND_CTL_CLRCLE:
	MACRO_NAND_CTL_CLRCLE((unsigned long)CFG_NAND0_PADDR);
	break;
	case NAND_CTL_SETALE:
	MACRO_NAND_CTL_SETALE((unsigned long)CFG_NAND0_PADDR);
	break;
	case NAND_CTL_CLRALE:
	MACRO_NAND_CTL_CLRALE((unsigned long)CFG_NAND0_PADDR);
	break;
	case NAND_CTL_SETNCE:
	MACRO_NAND_ENABLE_CE((unsigned long)CFG_NAND0_PADDR);
	break;
	case NAND_CTL_CLRNCE:
	MACRO_NAND_DISABLE_CE((unsigned long)CFG_NAND0_PADDR);
	break;
	}
	}
	if (cmd != NAND_CMD_NONE)
	writeb(cmd, chip->IO_ADDR_W);
	}

	static void ppchameleonevb_hwcontrol(struct mtd_info *mtdinfo, int cmd,
	unsigned int ctrl)
	{
	struct nand_chip *chip = mtd->priv;

	if (ctrl & NAND_CTRL_CHANGE) {
	#error Missing headerfiles. No way to fix this. -tglx
	switch (cmd) {
	case NAND_CTL_SETCLE:
	MACRO_NAND_CTL_SETCLE((unsigned long)CFG_NAND1_PADDR);
	break;
	case NAND_CTL_CLRCLE:
	MACRO_NAND_CTL_CLRCLE((unsigned long)CFG_NAND1_PADDR);
	break;
	case NAND_CTL_SETALE:
	MACRO_NAND_CTL_SETALE((unsigned long)CFG_NAND1_PADDR);
	break;
	case NAND_CTL_CLRALE:
	MACRO_NAND_CTL_CLRALE((unsigned long)CFG_NAND1_PADDR);
	break;
	case NAND_CTL_SETNCE:
	MACRO_NAND_ENABLE_CE((unsigned long)CFG_NAND1_PADDR);
	break;
	case NAND_CTL_CLRNCE:
	MACRO_NAND_DISABLE_CE((unsigned long)CFG_NAND1_PADDR);
	break;
	}
	}
	if (cmd != NAND_CMD_NONE)
	writeb(cmd, chip->IO_ADDR_W);
	}

	#ifdef USE_READY_BUSY_PIN
	/*
	* read device ready pin
	*/
	static int ppchameleon_device_ready(struct mtd_info *minfo)
	{
	if (in_be32((volatile unsigned *)GPIO0_IR) & NAND_RB_GPIO_PIN)
	return 1;
	return 0;
	}

	static int ppchameleonevb_device_ready(struct mtd_info *minfo)
	{
	if (in_be32((volatile unsigned *)GPIO0_IR) & NAND_EVB_RB_GPIO_PIN)
	return 1;
	return 0;
	}
	#endif

	/*
	* Main initialization routine
	*/
	static int __init ppchameleonevb_init(void)
	{
	struct nand_chip *this;
	void __iomem *ppchameleon_fio_base;
	void __iomem *ppchameleonevb_fio_base;

	/*********************************
	* Processor module NAND (if any) *
	*********************************/
	/* Allocate memory for MTD device structure and private data */
	ppchameleon_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
	if (!ppchameleon_mtd) {
	printk("Unable to allocate PPChameleon NAND MTD device structure.\n");
	return -ENOMEM;
	}

	/* map physical address */
	ppchameleon_fio_base = ioremap(ppchameleon_fio_pbase, SZ_4M);
	if (!ppchameleon_fio_base) {
	printk("ioremap PPChameleon NAND flash failed\n");
	kfree(ppchameleon_mtd);
	return -EIO;
	}

	/* Get pointer to private data */
	this = (struct nand_chip *)(&ppchameleon_mtd[1]);

	/* Initialize structures */
	memset(ppchameleon_mtd, 0, sizeof(struct mtd_info));
	memset(this, 0, sizeof(struct nand_chip));

	/* Link the private data with the MTD structure */
	ppchameleon_mtd->priv = this;
	ppchameleon_mtd->owner = THIS_MODULE;

	/* Initialize GPIOs */
	/* Pin mapping for NAND chip */
	/*
	CE GPIO_01
	CLE GPIO_02
	ALE GPIO_03
	R/B GPIO_04
	*/
	/* output select */
	out_be32((volatile unsigned )GPIO0_OSRH, in_be32((volatile unsigned )GPIO0_OSRH) & 0xC0FFFFFF);
	/* three-state select */
	out_be32((volatile unsigned )GPIO0_TSRH, in_be32((volatile unsigned )GPIO0_TSRH) & 0xC0FFFFFF);
	/* enable output driver */
	out_be32((volatile unsigned *)GPIO0_TCR,
	in_be32((volatile unsigned *)GPIO0_TCR) \| NAND_nCE_GPIO_PIN \| NAND_CLE_GPIO_PIN \| NAND_ALE_GPIO_PIN);
	#ifdef USE_READY_BUSY_PIN
	/* three-state select */
	out_be32((volatile unsigned )GPIO0_TSRH, in_be32((volatile unsigned )GPIO0_TSRH) & 0xFF3FFFFF);
	/* high-impedecence */
	out_be32((volatile unsigned )GPIO0_TCR, in_be32((volatile unsigned )GPIO0_TCR) & (~NAND_RB_GPIO_PIN));
	/* input select */
	out_be32((volatile unsigned *)GPIO0_ISR1H,
	(in_be32((volatile unsigned *)GPIO0_ISR1H) & 0xFF3FFFFF) \| 0x00400000);
	#endif

	/* insert callbacks */
	this->IO_ADDR_R = ppchameleon_fio_base;
	this->IO_ADDR_W = ppchameleon_fio_base;
	this->cmd_ctrl = ppchameleon_hwcontrol;
	#ifdef USE_READY_BUSY_PIN
	this->dev_ready = ppchameleon_device_ready;
	#endif
	this->chip_delay = NAND_BIG_DELAY_US;
	/* ECC mode */
	this->ecc.mode = NAND_ECC_SOFT;

	/* Scan to find existence of the device (it could not be mounted) */
	if (nand_scan(ppchameleon_mtd, 1)) {
	iounmap((void *)ppchameleon_fio_base);
	ppchameleon_fio_base = NULL;
	kfree(ppchameleon_mtd);
	goto nand_evb_init;
	}
	#ifndef USE_READY_BUSY_PIN
	/* Adjust delay if necessary */
	if (ppchameleon_mtd->size == NAND_SMALL_SIZE)
	this->chip_delay = NAND_SMALL_DELAY_US;
	#endif

	ppchameleon_mtd->name = "ppchameleon-nand";

	/* Register the partitions */
	mtd_device_parse_register(ppchameleon_mtd, NULL, 0,
	ppchameleon_mtd->size == NAND_SMALL_SIZE ?
	partition_info_me :
	partition_info_hi,
	NUM_PARTITIONS);

	nand_evb_init:
	/****************************
	* EVB NAND (always present) *
	****************************/
	/* Allocate memory for MTD device structure and private data */
	ppchameleonevb_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
	if (!ppchameleonevb_mtd) {
	printk("Unable to allocate PPChameleonEVB NAND MTD device structure.\n");
	if (ppchameleon_fio_base)
	iounmap(ppchameleon_fio_base);
	return -ENOMEM;
	}

	/* map physical address */
	ppchameleonevb_fio_base = ioremap(ppchameleonevb_fio_pbase, SZ_4M);
	if (!ppchameleonevb_fio_base) {
	printk("ioremap PPChameleonEVB NAND flash failed\n");
	kfree(ppchameleonevb_mtd);
	if (ppchameleon_fio_base)
	iounmap(ppchameleon_fio_base);
	return -EIO;
	}

	/* Get pointer to private data */
	this = (struct nand_chip *)(&ppchameleonevb_mtd[1]);

	/* Initialize structures */
	memset(ppchameleonevb_mtd, 0, sizeof(struct mtd_info));
	memset(this, 0, sizeof(struct nand_chip));

	/* Link the private data with the MTD structure */
	ppchameleonevb_mtd->priv = this;

	/* Initialize GPIOs */
	/* Pin mapping for NAND chip */
	/*
	CE GPIO_14
	CLE GPIO_15
	ALE GPIO_16
	R/B GPIO_31
	*/
	/* output select */
	out_be32((volatile unsigned )GPIO0_OSRH, in_be32((volatile unsigned )GPIO0_OSRH) & 0xFFFFFFF0);
	out_be32((volatile unsigned )GPIO0_OSRL, in_be32((volatile unsigned )GPIO0_OSRL) & 0x3FFFFFFF);
	/* three-state select */
	out_be32((volatile unsigned )GPIO0_TSRH, in_be32((volatile unsigned )GPIO0_TSRH) & 0xFFFFFFF0);
	out_be32((volatile unsigned )GPIO0_TSRL, in_be32((volatile unsigned )GPIO0_TSRL) & 0x3FFFFFFF);
	/* enable output driver */
	out_be32((volatile unsigned )GPIO0_TCR, in_be32((volatile unsigned )GPIO0_TCR) \| NAND_EVB_nCE_GPIO_PIN \|
	NAND_EVB_CLE_GPIO_PIN \| NAND_EVB_ALE_GPIO_PIN);
	#ifdef USE_READY_BUSY_PIN
	/* three-state select */
	out_be32((volatile unsigned )GPIO0_TSRL, in_be32((volatile unsigned )GPIO0_TSRL) & 0xFFFFFFFC);
	/* high-impedecence */
	out_be32((volatile unsigned )GPIO0_TCR, in_be32((volatile unsigned )GPIO0_TCR) & (~NAND_EVB_RB_GPIO_PIN));
	/* input select */
	out_be32((volatile unsigned *)GPIO0_ISR1L,
	(in_be32((volatile unsigned *)GPIO0_ISR1L) & 0xFFFFFFFC) \| 0x00000001);
	#endif

	/* insert callbacks */
	this->IO_ADDR_R = ppchameleonevb_fio_base;
	this->IO_ADDR_W = ppchameleonevb_fio_base;
	this->cmd_ctrl = ppchameleonevb_hwcontrol;
	#ifdef USE_READY_BUSY_PIN
	this->dev_ready = ppchameleonevb_device_ready;
	#endif
	this->chip_delay = NAND_SMALL_DELAY_US;

	/* ECC mode */
	this->ecc.mode = NAND_ECC_SOFT;

	/* Scan to find existence of the device */
	if (nand_scan(ppchameleonevb_mtd, 1)) {
	iounmap((void *)ppchameleonevb_fio_base);
	kfree(ppchameleonevb_mtd);
	if (ppchameleon_fio_base)
	iounmap(ppchameleon_fio_base);
	return -ENXIO;
	}

	ppchameleonevb_mtd->name = NAND_EVB_MTD_NAME;

	/* Register the partitions */
	mtd_device_parse_register(ppchameleonevb_mtd, NULL, 0,
	ppchameleon_mtd->size == NAND_SMALL_SIZE ?
	partition_info_me :
	partition_info_hi,
	NUM_PARTITIONS);

	/* Return happy */
	return 0;
	}

	module_init(ppchameleonevb_init);

	/*
	* Clean up routine
	*/
	static void __exit ppchameleonevb_cleanup(void)
	{
	struct nand_chip *this;

	/* Release resources, unregister device(s) */
	nand_release(ppchameleon_mtd);
	nand_release(ppchameleonevb_mtd);

	/* Release iomaps */
	this = (struct nand_chip *) &ppchameleon_mtd[1];
	iounmap((void *) this->IO_ADDR_R);
	this = (struct nand_chip *) &ppchameleonevb_mtd[1];
	iounmap((void *) this->IO_ADDR_R);

	/* Free the MTD device structure */
	kfree (ppchameleon_mtd);
	kfree (ppchameleonevb_mtd);
	}
	module_exit(ppchameleonevb_cleanup);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("DAVE Srl <support-ppchameleon@dave-tech.it>");
	MODULE_DESCRIPTION("MTD map driver for DAVE Srl PPChameleonEVB board");