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 "s3c24xx_nand.h"
  32
  33
  34 s3c24xx_nand_controller_t *
  35 s3c24xx_nand_device_command(struct command_context_s *cmd_ctx, char *cmd,
  36                             char **args, int argc,
  37                             struct nand_device_s *device)
  38 {
  39         s3c24xx_nand_controller_t *s3c24xx_info;
  40
  41         s3c24xx_info = malloc(sizeof(s3c24xx_nand_controller_t));
  42         if (s3c24xx_info == NULL) {
  43                 LOG_ERROR("no memory for nand controller\n");
  44                 return NULL;
  45         }
  46
  47         device->controller_priv = s3c24xx_info;
  48
  49         s3c24xx_info->target = get_target_by_num(strtoul(args[1], NULL, 0));
  50         if (s3c24xx_info->target == NULL) {
  51                 LOG_ERROR("no target '%s' configured", args[1]);
  52                 return NULL;
  53         }
  54
  55         return s3c24xx_info;
  56 }
  57
  58 int s3c24xx_register_commands(struct command_context_s *cmd_ctx)
  59 {
  60         return ERROR_OK;
  61 }
  62
  63 int s3c24xx_reset(struct nand_device_s *device)
  64 {
  65         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  66         target_t *target = s3c24xx_info->target;
  67
  68         if (target->state != TARGET_HALTED) {
  69                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  70                 return ERROR_NAND_OPERATION_FAILED;
  71         }
  72
  73         target_write_u32(target, s3c24xx_info->cmd, 0xff);
  74
  75         return ERROR_OK;
  76 }
  77
  78 int s3c24xx_command(struct nand_device_s *device, u8 command)
  79 {
  80         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  81         target_t *target = s3c24xx_info->target;
  82
  83         if (target->state != TARGET_HALTED) {
  84                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  85                 return ERROR_NAND_OPERATION_FAILED;
  86         }
  87
  88         target_write_u16(target, s3c24xx_info->cmd, command);
  89         return ERROR_OK;
  90 }
  91
  92
  93 int s3c24xx_address(struct nand_device_s *device, u8 address)
  94 {
  95         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  96         target_t *target = s3c24xx_info->target;
  97
  98         if (target->state != TARGET_HALTED) {
  99                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
 100                 return ERROR_NAND_OPERATION_FAILED;
 101         }
 102
 103         target_write_u16(target, s3c24xx_info->addr, address);
 104         return ERROR_OK;
 105 }
 106
 107 int s3c24xx_write_data(struct nand_device_s *device, u16 data)
 108 {
 109         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 110         target_t *target = s3c24xx_info->target;
 111
 112         if (target->state != TARGET_HALTED) {
 113                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
 114                 return ERROR_NAND_OPERATION_FAILED;
 115         }
 116
 117         target_write_u8(target, s3c24xx_info->data, data);
 118         return ERROR_OK;
 119 }
 120
 121 int s3c24xx_read_data(struct nand_device_s *device, void *data)
 122 {
 123         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 124         target_t *target = s3c24xx_info->target;
 125
 126         if (target->state != TARGET_HALTED) {
 127                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
 128                 return ERROR_NAND_OPERATION_FAILED;
 129         }
 130
 131         target_read_u8(target, s3c24xx_info->data, data);
 132         return ERROR_OK;
 133 }
 134
 135 int s3c24xx_controller_ready(struct nand_device_s *device, int timeout)
 136 {
 137         return 1;
 138 }