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/***************************************************************************
 *   Copyright (C) 2007, 2008 by Ben Dooks                                 *
 *   ben@fluff.org                                                         *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

/*
 * S3C2410 OpenOCD NAND Flash controller support.
 *
 * Many thanks to Simtec Electronics for sponsoring this work.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "replacements.h"
#include "log.h"

#include <stdlib.h>
#include <string.h>

#include "nand.h"
#include "s3c24xx_nand.h"
#include "target.h"

int s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct nand_device_s *device);
int s3c2410_init(struct nand_device_s *device);
int s3c2410_read_data(struct nand_device_s *device, void *data);
int s3c2410_write_data(struct nand_device_s *device, u16 data);
int s3c2410_nand_ready(struct nand_device_s *device, int timeout);

nand_flash_controller_t s3c2410_nand_controller =
{
	.name			= "s3c2410",
	.nand_device_command	= s3c2410_nand_device_command,
	.register_commands	= s3c24xx_register_commands,
	.init			= s3c2410_init,
	.reset			= s3c24xx_reset,
	.command		= s3c24xx_command,
	.address		= s3c24xx_address,
	.write_data		= s3c2410_write_data,
	.read_data		= s3c2410_read_data,
	.write_page		= s3c24xx_write_page,
	.read_page		= s3c24xx_read_page,
	.controller_ready	= s3c24xx_controller_ready,
	.nand_ready		= s3c2410_nand_ready,
};

int s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *cmd,
				char **args, int argc,
				struct nand_device_s *device)
{
	s3c24xx_nand_controller_t *info;
	
	info = s3c24xx_nand_device_command(cmd_ctx, cmd, args, argc, device);
	if (info == NULL) {
		return ERROR_NAND_DEVICE_INVALID;
	}

	/* fill in the address fields for the core device */
	info->cmd = S3C2410_NFCMD;
	info->addr = S3C2410_NFADDR;
	info->data = S3C2410_NFDATA;
	info->nfstat = S3C2410_NFSTAT;
		
	return ERROR_OK;
}

int s3c2410_init(struct nand_device_s *device)
{
	s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
	target_t *target = s3c24xx_info->target;

	target_write_u32(target, S3C2410_NFCONF, 
			 S3C2410_NFCONF_EN | S3C2410_NFCONF_TACLS(3) |
			 S3C2410_NFCONF_TWRPH0(5) | S3C2410_NFCONF_TWRPH1(3));

	return ERROR_OK;
}

int s3c2410_write_data(struct nand_device_s *device, u16 data)
{
	s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
	target_t *target = s3c24xx_info->target;

	if (target->state != TARGET_HALTED) {
		LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
		return ERROR_NAND_OPERATION_FAILED;
	}
	
	target_write_u32(target, S3C2410_NFDATA, data);
	return ERROR_OK;
}

int s3c2410_read_data(struct nand_device_s *device, void *data)
{
	s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
	target_t *target = s3c24xx_info->target;
	
	if (target->state != TARGET_HALTED) {
		LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
		return ERROR_NAND_OPERATION_FAILED;
	}

	target_read_u8(target, S3C2410_NFDATA, data);	
	return ERROR_OK;
}

int s3c2410_nand_ready(struct nand_device_s *device, int timeout)
{
	s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
	target_t *target = s3c24xx_info->target;
	u8 status;

	if (target->state != TARGET_HALTED) {
		LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
		return ERROR_NAND_OPERATION_FAILED;
	}
	
	do {
		target_read_u8(target, S3C2410_NFSTAT, &status);
		
		if (status & S3C2410_NFSTAT_BUSY)
			return 1;

		usleep(1000);		
	} while (timeout-- > 0);

	return 0;
}