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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 "s3c24xx_nand.h"
static int s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct nand_device_s *device);
static int s3c2410_init(struct nand_device_s *device);
static int s3c2410_read_data(struct nand_device_s *device, void *data);
static int s3c2410_write_data(struct nand_device_s *device, u16 data);
static 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,
};
static 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;
}
static 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;
}
static 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;
}
static 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;
}
static 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;
alive_sleep(1);
} while (timeout-- > 0);
return 0;
}
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