src/flash/s3c24xx_nand.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007, 2008 by Ben Dooks                                 *
   3  *   ben@fluff.org                                                         *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20
  21 /*
  22  * S3C24XX Series OpenOCD NAND Flash controller support.
  23  *
  24  * Many thanks to Simtec Electronics for sponsoring this work.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include "replacements.h"
  32 #include "log.h"
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include "nand.h"
  38 #include "s3c24xx_nand.h"
  39 #include "target.h"
  40
  41 s3c24xx_nand_controller_t *
  42 s3c24xx_nand_device_command(struct command_context_s *cmd_ctx, char *cmd,
  43                             char **args, int argc,
  44                             struct nand_device_s *device)
  45 {
  46         s3c24xx_nand_controller_t *s3c24xx_info;
  47
  48         s3c24xx_info = malloc(sizeof(s3c24xx_nand_controller_t));
  49         if (s3c24xx_info == NULL) {
  50                 LOG_ERROR("no memory for nand controller\n");
  51                 return NULL;
  52         }
  53
  54         device->controller_priv = s3c24xx_info;
  55
  56         s3c24xx_info->target = get_target_by_num(strtoul(args[1], NULL, 0));
  57         if (s3c24xx_info->target == NULL) {
  58                 LOG_ERROR("no target '%s' configured", args[1]);
  59                 return NULL;
  60         }
  61
  62         return s3c24xx_info;
  63 }
  64
  65 int s3c24xx_register_commands(struct command_context_s *cmd_ctx)
  66 {
  67         return ERROR_OK;
  68 }
  69
  70 int s3c24xx_reset(struct nand_device_s *device)
  71 {
  72         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  73         target_t *target = s3c24xx_info->target;
  74
  75         if (target->state != TARGET_HALTED) {
  76                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  77                 return ERROR_NAND_OPERATION_FAILED;
  78         }
  79
  80         target_write_u32(target, s3c24xx_info->cmd, 0xff);
  81
  82         return ERROR_OK;
  83 }
  84
  85 int s3c24xx_command(struct nand_device_s *device, u8 command)
  86 {
  87         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  88         target_t *target = s3c24xx_info->target;
  89
  90         if (target->state != TARGET_HALTED) {
  91                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  92                 return ERROR_NAND_OPERATION_FAILED;
  93         }
  94
  95         target_write_u16(target, s3c24xx_info->cmd, command);
  96         return ERROR_OK;
  97 }
  98
  99
 100 int s3c24xx_address(struct nand_device_s *device, u8 address)
 101 {
 102         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 103         target_t *target = s3c24xx_info->target;
 104
 105         if (target->state != TARGET_HALTED) {
 106                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
 107                 return ERROR_NAND_OPERATION_FAILED;
 108         }
 109
 110         target_write_u16(target, s3c24xx_info->addr, address);
 111         return ERROR_OK;
 112 }
 113
 114 int s3c24xx_write_data(struct nand_device_s *device, u16 data)
 115 {
 116         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 117         target_t *target = s3c24xx_info->target;
 118
 119         if (target->state != TARGET_HALTED) {
 120                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
 121                 return ERROR_NAND_OPERATION_FAILED;
 122         }
 123
 124         target_write_u8(target, s3c24xx_info->data, data);
 125         return ERROR_OK;
 126 }
 127
 128 int s3c24xx_read_data(struct nand_device_s *device, void *data)
 129 {
 130         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 131         target_t *target = s3c24xx_info->target;
 132
 133         if (target->state != TARGET_HALTED) {
 134                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
 135                 return ERROR_NAND_OPERATION_FAILED;
 136         }
 137
 138         target_read_u8(target, s3c24xx_info->data, data);
 139         return ERROR_OK;
 140 }
 141
 142 int s3c24xx_controller_ready(struct nand_device_s *device, int timeout)
 143 {
 144         return 1;
 145 }